JP6641703B2 - Plastic bottles, preforms and fillings - Google Patents

Description

  The present invention relates to a plastic bottle, a preform used when producing the plastic bottle, and a filler, and more specifically, a plastic bottle reduced in weight, a preform used when producing the plastic bottle, And a filler.

  For example, a plastic bottle is used as a container of a filling body filled with a beverage. For manufacturing a plastic bottle, a method of molding a test tubular preform from a resin by an injection molding machine or the like and molding the preform into a bottle by a blow molding machine is often used.

  The production volume of plastic bottles is increasing every year. On the other hand, the weight of plastic bottles is reduced by reducing the use of raw materials from the viewpoint of reducing energy consumption and carbon dioxide emissions by saving resources, reducing garbage, and reducing the environmental burden during transportation. Is being worked on.

  In Patent Literature 1, a male screw portion and a support ring are formed below the male screw portion on the outer peripheral surface of the peripheral wall of the bottle mouth portion, and the screw portion of the male screw portion and the peripheral wall portion at a position separated from the support ring are formed. Discloses a plastic bottle having a lightening portion.

JP 2010-095269 A

  According to the plastic bottle of Patent Literature 1, it is described that the weight can be reduced without impairing the strength of the bottle mouth as compared with a case where the whole is uniformly thinned. Furthermore, it is described that the fluidity of the resin at the time of molding the bottle mouth portion is suppressed, and the moldability of the preform is not impaired.

  However, when transporting a plastic bottle or a preform, a fogger located below the screw and a support ring located below the fogger are held by a gripper provided in a filling device or the like. Therefore, the lightened portion formed on the lower side of the fogger as in Patent Literature 1 may lead to conveyance failure.

  Therefore, an object of the present invention is to provide a plastic bottle, a preform, and a filler in which the weight of the plug portion is reduced without changing the shape of the existing device and the cap.

In order to solve the above problems, the present invention provides a plastic bottle including a bottle body and a substantially cylindrical stopper located on the upper side of the bottle, wherein the stopper has an upper end and a lower end. A screw that spirally projects outward from the upper end to the lower end, a flap that protrudes outward in a circular fashion below the screw, and a protrudes outward in a circular fashion below the flap. A support ring, and a lower portion of the fogger formed concentrically between the fogger and the support ring, wherein the fogger has an upper inclined surface and a lower substantially horizontal lower surface, The inclined surface of the fogger is provided with a straight portion that is linear in cross-section, and the lower surface of the fogger is inclined upward at an angle of more than 0 degrees with respect to a horizontal line at an angle of 3 degrees or less with respect to a horizontal line. the width of turnip is 1.2mm or more, be 2.0mm or less Vertical width of the outer end of the screw is 0.4mm or more and 0.9mm or less,
A vertical width of an outer end of the fogger is 0.3 mm or more and 1.0 mm or less .

Furthermore, the present invention provides a plastic bottle comprising a bottle body and a substantially cylindrical stopper located on the upper side of the bottle body, wherein the stopper has an upper end and a lower end, and A screw spirally projecting outward from the lower end to the lower end, a flap projecting outwardly in a loop below the screw, and a support ring projecting outwardly in a loop below the flap. A lower fogger formed concentrically between the fogger and the support ring; the fogger having an upper inclined surface and a lower substantially horizontal lower surface; , A curved portion is formed on the upper side, the radius of curvature of the curved portion is not less than 0.2 mm and not more than 1.4 mm, and the lower surface of the fogger is upwardly directed outward at 0 ° with respect to a horizontal line. Over 3 degrees, and the width of the foggers is 1.2 m or more and 2.0mm or less, the vertical width of the outer end of the screw is 0.4mm or more and 0.9mm or less, the vertical width of the outer end of the turnip is 0.3mm or more, at 1.0mm or less There is a feature.

Furthermore, it inclined slopes of the turnips, characterized in that it comprises a straight portion linear in sectional view.

  Further, an angle between the inclined surface and the lower surface is not less than 15 degrees and not more than 50 degrees.

  Further, the outer diameter of the fogger is 25 mm or more and 32 mm or less, the outer diameter of the screw is 26 mm or more and 28 mm or less, and the pitch of the screw is 2.5 mm or more and 3.5 mm or less. It is characterized by.

  Further, a winding angle of the screw from the upper end to the lower end is not less than 550 degrees and not more than 800 degrees.

Moreover, the projecting height from under the fogged to the outer end of the turnip is 1.2 mm or more, 3. 0 mm or less.

Further, the present invention provides a preform including a preform body and a substantially cylindrical plug portion located above the preform body, wherein the plug portion has an upper end portion and a lower end portion. A screw spirally projecting outward from the upper end to the lower end, a flap projecting outwardly in a loop below the screw, and a support ring projecting outwardly in a circle below the flap. And a lower fogger formed concentrically between the fogger and the support ring, wherein the fogger has an upper inclined surface and a lower, substantially horizontal lower surface. The inclined surface is provided with a straight portion that is linear in cross-sectional view, and the lower surface of the fogging is inclined upward at an angle of more than 0 ° with respect to a horizontal line at 3 ° or less with respect to a horizontal line. is 1.2mm or more and 2.0mm or less, of the screw Vertical width of the end 0.4mm or more and 0.9mm or less, the vertical width of the outer end of the turnip is above 0.3 mm, and wherein the at 1.0mm or less.

Further, the present invention provides a preform including a preform body and a substantially cylindrical plug portion located above the preform body, wherein the plug portion has an upper end portion and a lower end portion. A screw spirally projecting outward from the upper end to the lower end, a flap projecting outwardly in a loop below the screw, and a support ring projecting outwardly in a circle below the flap. And a lower fogger formed concentrically between the fogger and the support ring, wherein the fogger has an upper inclined surface and a lower, substantially horizontal lower surface. At the outer end, a curved portion is formed on the upper side, the radius of curvature of the curved portion is not less than 0.2 mm and not more than 1.4 mm, and the lower surface of the fogger is upwardly directed outward with respect to a horizontal line. It is inclined at more than 0 degree and at most 3 degrees, and the width of the fogger is .2mm or more and 2.0mm or less, the vertical width of the outer end of the screw is 0.4mm or more and 0.9mm or less, the vertical width of the outer end of the turnip is 0.3mm or more, 1.0 mm or less It is characterized by being.

Furthermore, it inclined slopes of the turnips, characterized in that it comprises a straight portion linear in sectional view.

  Furthermore, the vertical width of the outer end of the fogger is 0.3 mm or more and 1.0 mm or less.

  Further, an angle between the inclined surface and the lower surface is not less than 15 degrees and not more than 50 degrees.

  Further, the outer diameter of the fogger is 25 mm or more and 32 mm or less, the outer diameter of the screw is 26 mm or more and 28 mm or less, and the pitch of the screw is 2.5 mm or more and 3.5 mm or less. It is characterized by.

  Further, a winding angle of the screw from the upper end to the lower end is not less than 550 degrees and not more than 800 degrees.

Moreover, the projecting height from under the fogged to the outer end of the turnip is 1.2 mm or more, 3. 0 mm or less.

  Furthermore, a filling body according to the present invention includes the above-mentioned plastic bottle, contents to be filled in the plastic bottle, and a cap attached to a plug portion of the plastic bottle, wherein the contents are a foaming solution. It is characterized by being.

According to the present invention, in a plastic bottle including a bottle main body and a substantially cylindrical plug positioned on the upper side of the bottle main body, the plug has an upper end and a lower end, and has a lower end to a lower end. A screw that protrudes outward spirally to the part, a flap that protrudes circumferentially outward below the screw, a support ring that protrudes outward circularly below the flap, and a flap and support ring. The fogger has an upper inclined surface and a lower substantially horizontal lower surface, and the inclined surface of the fogger has a straight straight portion in a cross-sectional view. The lower surface of the fogger is upwardly outwardly inclined at an angle of more than 0 degrees and less than 3 degrees with respect to a horizontal line, the width of the fogger is 1.2 mm or more and 2.0 mm or less , The top and bottom width of the outer edge of the Vertical width of the outer end 0.3mm or more, because it is 1.0mm or less, the existing equipment, and without the shape of the cap is changed, providing a plastic bottle lighter mouth part is achieved Can be.

Furthermore, according to the present invention, in a plastic bottle including a bottle body and a substantially cylindrical stopper located on the upper side of the bottle body, the stopper has an upper end and a lower end, and the upper end has a lower end. A screw that protrudes outward spirally from the lower end to the lower end, a flap that protrudes outward circularly below the screw, a support ring that protrudes outward circularly below the flap, and a fogger and support ring And a lower fogger formed concentrically between the upper and lower foggers.The fogger has an upper inclined surface and a lower substantially horizontal lower surface. It is formed, the radius of curvature of the curved portion is 0.2 mm or more and 1.4 mm or less, and the lower surface of the fogger is inclined upward at an angle of more than 0 degree and 3 degrees or less with respect to a horizontal line toward the outside. , the width of the turnip is 1.2mm or more and 2.0mm or less, on the outer end of the screw Width 0.4mm or more and 0.9mm or less, the vertical width of the outer end of the turnip is 0.3mm or more, because it is 1.0mm or less, without existing device, and the shape of the cap is changed, A plastic bottle in which the weight of the spout is reduced can be provided.

  Furthermore, according to the configuration in which the inclined surface of the fogger is provided with a straight portion that is linear in cross-sectional view, the existing device and the shape of the cap are not changed, and the weight of the plug portion is reduced. Bottles can be provided.

  Furthermore, according to the configuration in which the angle between the inclined surface and the lower surface is 15 degrees or more and 50 degrees or less, the weight of the plug portion can be reduced without changing the shape of the existing device and the cap. Plastic bottles can be provided.

  Further, according to the configuration, the outer diameter of the fogger is 25 mm or more and 32 mm or less, the outer diameter of the screw is 26 mm or more and 28 mm or less, and the pitch of the screw is 2.5 mm or more and 3.5 mm or less. Thus, it is possible to provide a plastic bottle in which the weight of the plug is reduced and the sealing property is excellent without changing the shapes of the existing device and the cap.

  Furthermore, according to the configuration in which the winding angle from the upper end to the lower end of the screw is 550 degrees or more and 800 degrees or less, the weight of the plug portion can be reduced without changing the shape of the existing device and the cap. It is possible to provide a plastic bottle that is designed and has excellent sealing performance.

Moreover, the projecting height from the bottom turnip to the outer end of the turnip is 1.2 mm or more, 3. According to the configuration of 0 mm or less, it is possible to provide a plastic bottle in which the weight of the plug portion is reduced without changing the shape of the existing device and the cap.

Furthermore, according to the present invention, in a preform including a preform main body and a substantially cylindrical plug located on the upper side of the preform main body, the plug has an upper end and a lower end. A screw that protrudes outward spirally from the upper end to the lower end, a flap that protrudes outward circularly below the screw, a support ring that protrudes outward circularly below the flap, and a flap A flap lower formed concentrically with the support ring, the fogger has an upper inclined surface, and a lower substantially horizontal lower surface, and the inclined surface of the fogger is straight in a sectional view. The lower surface of the fogger is inclined upward and outward at an angle of more than 0 degrees and less than 3 degrees with respect to a horizontal line, and the width of the fogger is 1.2 mm or more and 2.0 mm or less. When the vertical width of the outer end of the screw is 0.4 mm or more and 0.9 mm or less, Ri, the vertical width of the outer end of the turnip is 0.3mm or more, because it is 1.0mm or less, the existing equipment, and without the shape of the cap is changed, the plastic bottle lighter mouth part is achieved Can be provided.

Furthermore, according to the present invention, in a preform including a preform main body and a substantially cylindrical plug located on the upper side of the preform main body, the plug has an upper end and a lower end. A screw that protrudes outward spirally from the upper end to the lower end, a flap that protrudes outward circularly below the screw, a support ring that protrudes outward circularly below the flap, and a flap A flap lower formed concentrically between the support ring and the fogger has an upper inclined surface and a lower substantially horizontal lower surface, and the outer end of the fogger has a curved upper surface. The radius of curvature of the curved portion is not less than 0.2 mm and not more than 1.4 mm, and the lower surface of the flap is upwardly directed outward, exceeding 0 degree with respect to the horizontal line, and not more than 3 degrees. angled, the width of the turnip is 1.2mm or more and 2.0mm or less, out of the screw The vertical width is 0.4mm or more and 0.9mm or less, the vertical width of the outer end of the turnip is 0.3mm or more, because it is 1.0mm or less, the existing device, and the shape of the cap is changed In addition, it is possible to provide a preform used for producing a plastic bottle in which the weight of the plug portion is reduced.

  Furthermore, according to the configuration in which the inclined surface of the fogger is provided with a straight portion that is linear in cross-sectional view, the existing device and the shape of the cap are not changed, and the weight of the plug portion is reduced. A preform used for producing a bottle can be provided.

  Furthermore, according to the configuration in which the vertical width of the outer end of the fogger is 0.3 mm or more and 1.0 mm or less, the weight of the plug portion can be reduced without changing the shape of the existing device and the cap. The present invention can provide a preform used for producing a plastic bottle obtained.

  Furthermore, according to the configuration in which the angle between the inclined surface and the lower surface is 15 degrees or more and 50 degrees or less, the weight of the plug portion can be reduced without changing the shape of the existing device and the cap. The present invention can provide a preform used for producing a plastic bottle obtained.

  Further, according to the configuration, the outer diameter of the fogger is 25 mm or more and 32 mm or less, the outer diameter of the screw is 26 mm or more and 28 mm or less, and the pitch of the screw is 2.5 mm or more and 3.5 mm or less. Thus, it is possible to provide a preform that can be used when manufacturing a plastic bottle with a reduced weight of the plug portion and excellent sealing performance without changing the shapes of the existing device and the cap.

  Furthermore, according to the configuration in which the winding angle from the upper end to the lower end of the screw is 550 degrees or more and 800 degrees or less, the weight of the plug portion can be reduced without changing the shape of the existing device and the cap. It is possible to provide a preform that is used and is used when producing a plastic bottle that is excellent in airtightness.

Moreover, the projecting height from the bottom turnip to the outer end of the turnip is 1.2 mm or more, 3. According to a configuration of 0 mm or less, an existing device and a preform used for manufacturing a plastic bottle with a lighter plug portion without changing the shape of a cap are provided. Can be.

  Furthermore, the filler according to the present invention includes the above-described plastic bottle, the content to be filled in the plastic bottle, and a cap attached to the plug of the plastic bottle, and the content is a foamable solution. Thus, it is possible to provide a filler using a plastic bottle in which the weight of the plug portion is reduced and the sealing property is excellent without changing the shapes of the existing device and the cap.

FIG. 1 is a front view showing a PET bottle as an example of a plastic bottle according to the embodiment. It is a top view of the PET bottle of FIG. FIG. 5 is a partial cross-sectional view showing a state in which a screw-in type cap is attached to the plug. It is sectional drawing which showed the upper end vicinity of the plug part. It is the schematic diagram which showed the conveyance process of the PET bottle typically. It is the front view in which the plug part was shown. It is the front view in which the support ring was shown. It is the front view in which the modification under a fogger was shown. FIG. 3 is a cross-sectional view showing an outer screw. FIG. 3 is a cross-sectional view showing a fogger. It is sectional drawing which showed the state which the plug part of the comparative example and the cap fitted. It is sectional drawing which showed the plug part of the comparative example superimposed on the plug part which concerns on this embodiment, and was shown. It is the front view in which the preform used when producing the PET bottle concerning this embodiment was shown.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, the configuration of the plastic bottle according to the present embodiment will be described in detail. FIG. 1 is a front view showing a PET bottle 10 as an example of a plastic bottle according to the present embodiment. In the following, for convenience of explanation, in the state of FIG. 1 in which the PET bottle 10 is erected, the plug portion 15 of the PET bottle 10 in which the contents are filled in the container is set to the upper side.

  The PET bottle 10 according to the present embodiment includes a bottle main body 11 and a plug portion 15 located above the bottle main body 11. The bottomed cylindrical bottle body 11 has a neck 11a, a shoulder 11b, a body 11c, and a bottom 11d. The PET bottle 10 illustrated in FIG. 1 is a so-called round bottle whose body 11c has a substantially cylindrical shape. In the PET bottle 10 according to the present embodiment, the shape of the bottle main body 11 is not particularly limited. Even if it is a so-called square bottle, the body 11c is a bottle that expands from the shoulder 11b toward the bottom 11d. May be. Further, when the content to be filled in the PET bottle 10 is, for example, a foaming solution, the bottom portion 11d may have a petaloid shape.

  The lower end of the substantially cylindrical plug portion 15 is connected to the bottle body 11. The plug part 15 includes an annular top surface 15a at the upper end, an outer peripheral surface 15b extending radially outward of the top surface 15a from the top surface 15a toward the bottle body 11, and a direction from the top surface 15a toward the bottle body 11. An inner peripheral surface 15c extending radially inward of the top surface 15a. The top surface 15a is formed flat.

  The plug portion 15 has a screw (outer screw 13), a flap 16, a support ring 17, and a fog lower 18 on an outer peripheral surface 15 b thereof. The external screw 13 for attaching a cap (not shown) has an upper end portion 13a and a lower end portion 13b, and projects outward spirally from the upper end portion 13a to the lower end portion 13b. In the vicinity of the upper end 13a of the outer screw 13, an incomplete screw portion 13c in which the upper side of the outer screw 13 is cut is formed. The fogger 16 protrudes outward in a circular shape below the outer screw 13. The support ring 17 is located at the lower end of the plug portion 15, and protrudes outwardly from the fog 16 in a circular shape below the fog 16. The lower edge 18 is formed concentrically between the edge 16 and the support ring 17.

  At the upper end, the plug 15 has an opening 19 inside the annular top surface 15a in the radial direction. FIG. 1 shows an axis A passing through the center of the plug portion 15 in the radial direction. The axis A corresponds to the position of the opening 19. At the upper end of the outer peripheral surface 15b, an annular protruding portion 20 that protrudes outward in a circular shape is formed.

  FIG. 2 is a plan view of the PET bottle 10 of FIG. That is, FIG. 2 is a view in the downward direction (II direction) of the axis A in FIG.

  In a plan view of the PET bottle 10, the angle of the outer screw 13 circling from the upper end 13 a to the lower end 13 b is referred to as a winding angle θ. For example, when the outer screw 13 is formed twice around the outer peripheral surface 15b from the upper end portion 13a to the lower end portion 13b, the winding angle θ is 720 degrees.

  The winding angle θ from the upper end 13a to the lower end 13b of the outer screw 13 is preferably 550 degrees or more and 800 degrees or less, more preferably 650 degrees or more and 750 degrees or less. By setting the winding angle θ to be 550 degrees or more, it is possible to maintain high hermeticity inside the PET bottle 10 and to prevent the cap from jumping due to the pressure inside the PET bottle 10. And even if the content is a foaming solution, for example, a carbonated beverage, the PET bottle 10 can be filled without any problem. On the other hand, by setting the winding angle θ to be equal to or less than 800 degrees, it is possible to prevent the weight of the PET bottle 10 from increasing. Therefore, when the winding angle θ of the outer screw 13 is within the above-described range, the weight of the plug portion 15 can be reduced, and the PET bottle 10 having excellent sealing performance can be provided.

  In addition, the above-mentioned imperfect thread part 13c is formed about 90 degrees from the upper end part 13a of the external thread 13. That is, the outer screw 13 is formed so as to gradually shift to a complete screw while making a 90 degree turn from the upper end 13a to the lower end 13b. Accordingly, the outer screw 13 having the winding angle θ of 750 degrees is constituted by, for example, a complete screw part of 660 degrees and an incomplete screw part 13c of 90 degrees. By shortening the incomplete screw portion 13c, the region of the complete screw can be made longer. However, if the incompletely threaded portion 13c is too short, an extra torque will be applied, making it difficult to wind the cap. Therefore, it is preferable that the incomplete screw portion 13c is set to 45 degrees or more and 90 degrees or less.

  The vent 13 illustrated in FIGS. 1 and 2 has four vent slots 14 cut out in parallel to the axis A of the PET bottle 10. The vent slot 14 serves as a passage (escape route) for gas ejected when the PET bottle 10 is opened when the internal pressure of the PET bottle 10 is rising, such as when a carbonated beverage is filled, and has a function of preventing the cap from flying. Therefore, when the PET bottle 10 is filled with contents that are unlikely to increase in internal pressure, for example, water, the vent slot 14 may not necessarily be provided. Note that the above-mentioned winding angle θ is a value that is regarded as being continuous from the upper end portion 13a to the lower end portion 13b even if the outer screw 13 has the vent slot 14.

  Although the outer screw 13 may be a double-start screw or a triple-start screw, the single-start screw illustrated in FIG. 1 is more preferable in that it is more difficult to loosen and has higher strength. The winding angle θ when the outer screw 13 is a double thread is preferably 90 degrees or more and 300 degrees or less, respectively, and the winding angle θ when the outer screw 13 is a triple screw is 70 degrees or more and 180 degrees or less, respectively. Is preferred.

  The plug 15 according to the present embodiment is reduced in weight by changing the shape of various parts. However, the fitting property with the cap which is widely used as a standard, the suitability of transporting the PET bottle 10 by a molding device or a filling device, and the strength of each part of the plug portion 15 required at the time of transporting and filling etc. In consideration of the above, there are various restrictions on changing the shape of the plug portion 15.

  Then, next, the configuration of the cap attached to the plug unit 15 will be described in detail. FIG. 3 is a partial cross-sectional view showing a state in which the screw cap 60 is attached to the plug unit 15. The PET bottle 10 is sealed by the cap 60 being wound around and attached to the plug unit 15.

  The cap 60 includes a cap body 61 located on the upper side when the cap 60 is attached to the plug unit 15 and a peeling ring 70 located on the lower side. The cap main body 61 has a disk-shaped upper part 62 and a cylindrical body part 63 hanging down from the periphery of the upper part 62. The body 63 has an inner screw 64 on its inner peripheral surface that meshes with the outer screw 13 of the plug 15. The upper part 62 includes an inner ring 65, a contact ring 66, and an outer ring 67 in order from a radially inner side of the cap 60 as annular projections hanging from the inner surface.

  The inner ring 65 has, on its outer peripheral surface, a protruding portion that protrudes outward from the cap 60, and the protruding portion of the inner ring 65 contacts the inner peripheral surface 15 c of the plug unit 15. The lower end of the contact ring 66 comes into contact with the top surface 15a of the plug unit 15. The outer ring 67 has, on the inner peripheral surface thereof, a protrusion protruding inward of the cap 60, and the protrusion of the outer ring 67 comes into contact with the annular protrusion 20 of the plug portion 15. And the tightness of PET bottle 10 is maintained by these three contact points.

  The release ring 70 has a ring shape. The release ring 70 includes a plurality of flaps 71 protruding inward and upward from an inner peripheral surface thereof. The flap 71 falls down on the inner peripheral surface side of the peeling ring 70 when the cap 60 is wound around the plug portion 15 until the PET bottle 10 is in the initial sealed state, and at the time of the subsequent initial opening, Is configured to be separated from the inner peripheral surface of the release ring 70. The cap body 61 and the peeling ring 70 are connected via a connecting member 72 that is configured to be breakable when the cap 60 is initially opened.

  The flap 71 at the time of the initial sealing is disposed between the fogger 16 and the support ring 17. When the cap 60 is rotated in the opening direction, the upper end of the flap 71 comes into contact with the fogger 16 and the upward movement of the peeling ring 70 is prevented. Further, when the cap 60 is rotated, the connecting member 72 is broken, and the cap body 61 and the peeling ring 70 are separated. Then, the peeling ring 70 is held between the fogger 16 and the support ring 17, and the cap body 61 is removed from the plug 15. As described above, the cap 60 has a tamper-evident preventing function, that is, a so-called tamper-evident property, which makes it possible to see at a glance whether or not the initial opening has been performed.

  FIG. 4 is a sectional view showing the vicinity of the upper end of the plug unit 15. As illustrated in FIG. 4, a chamfered portion 15d may be formed at a ridgeline of a joint between the top surface 15a and the inner peripheral surface 15c. By forming the chamfered portion 15d, the weight of the plug portion 15 can be reduced, and the vicinity of the junction between the top surface 15a of the plug portion 15 and the inner peripheral surface 15c, that is, the chamfered portion 15d is provided. It is possible to reduce scratches such as dents in the vicinity of the place where the dent is made.

  The angle γ of the chamfered portion 15d with respect to the top surface 15a is preferably 20 degrees or more and 60 degrees or less. When the angle γ of the chamfered portion 15d is less than 20 degrees or more than 60 degrees, it is difficult to obtain the effect of reducing scratches such as dents. Further, the width w1 in the radial direction and the width w2 in the height direction of the chamfered portion 15d are both preferably 0.15 mm or more and 0.45 mm or less. When the width w1 and the width w2 of the chamfered portion 15d are less than 0.15 mm, the effect of reducing scratches such as dents becomes difficult to obtain because the chamfered portion 15d is small. On the other hand, when the width w1 or the width w2 of the chamfered portion 15d exceeds 0.45 mm, the cap 60 is not likely to properly seal or cap the plug portion 15 because the chamfered portion 15d is large.

  Further, the end 15e of the chamfered portion 15d on the top surface 15a side, that is, the ridge line of the junction between the chamfered portion 15d and the top surface 15a, and the end 15f of the chamfered portion 15d on the inner peripheral surface 15c side, ie, the chamfered portion An R-shaped portion may be formed at each of the ridge lines at the joint between the inner peripheral surface 15c and the inner peripheral surface 15c. It is preferable that the radius of the radiused portion is 0.2 mm or more and 0.4 mm or less. Due to the formation of the R-shaped portion, when the cap 60 is attached to the plug portion 15, the edge of the end 15e or the end 15f causes the inner ring 65 or the contact ring 66 of the cap 60 to be damaged. Is prevented.

  Next, a configuration for carrying the PET bottle 10 will be described in detail.

  The molding of the PET bottle 10 and the filling of the PET bottle 10 with the contents are performed while the preform before molding and the PET bottle 10 are conveyed. In the case where the spout 15 has a common shape and outer diameter, there is little difference in the shape of the various PET bottles 10 as compared with the bottle body 11 (see FIG. 1) in which the shape, size, etc. are mixed. There are many. For this reason, in the transport method in which the plug unit 15 is gripped, even when the PET bottles 10 having different shapes, sizes, and the like are transported, it is necessary to change the equipment, particularly the gripping device of the transport device called a gripper. It is not necessary, and the cost and labor for updating the gripping device are not required. Therefore, a conveying method in which the plug unit 15 is gripped by a common gripper is widely used.

  FIG. 5 is a schematic diagram schematically showing a process of transporting the PET bottle 10. The forming device, the filling device, and the like include a plurality of rotating disk-shaped transport wheels 81, 82, and 83. A plurality of grippers 84, 85, and 86 are provided on the outer peripheral portion of each of the transport wheels 81, 82, and 83. The grippers 84, 85, and 86 are provided such that the heights thereof are alternated between the adjacent transport wheels 81, 82, and 83.

  The transfer wheels 81 and 83 are provided at a higher position. The grippers 84 and 86 of the transport wheels 81 and 83 are configured to grip the lower surface of the fogger 16 and the lower flap 18 of the PET bottle 10. On the other hand, the transport wheel 82 is provided at a lower position. The gripper 85 of the transport wheel 82 is configured to hold the lower surface of the support ring 17. With the grippers 84, 85, and 86 arranged in this manner, the transport wheels 81, 82, and 83 rotate so that the grippers 84, 85, and the PET bottles at positions where the grippers 85, 86 overlap in plan view. 10 are sequentially delivered. Even when the PET bottle 10 is transported in a straight line, the delivery of the PET bottle 10 can be sequentially performed by preparing the grippers 84 and 85 having alternate heights.

  As described above, the PET bottle 10 has a configuration in which the lower surface of the fogger 16 and the lower surface of the support ring 17 that can be gripped by the grippers 84 and 85 and the like, which are alternately arranged, have two upper and lower portions. The transfer is being performed. The gripper 84 and the like may be configured to grip not only the lower surface of the fogger 16 and the lower surface of the support ring 17 but also the upper and lower sides of each.

  FIG. 6 is a front view showing the plug unit 15. FIG. 6 shows the outer diameter of the outer screw 13 (corresponding to the thread diameter d1), the outer diameter of the plug portion 15 (corresponding to the thread root diameter d2), the inner diameter d3, the outer diameter dA of the fogger 16, and the lower part of the fogger. An outside diameter dB of 18 is shown. Further, FIG. 6 shows the height h1 of the plug part 15, the height h2 from the upper end of the support ring 17 to the top surface 15a, the height h3 from the lower end of the fogger 16 to the top surface 15a, and the height of the outer screw 13. A pitch p (distance between respective screw threads (screw valleys) of the upper and lower outer screws 13 in a sectional view) is shown.

  Preferably, these dimensions are, for example, the dimensions of a PET bottle 10 that is normally used for beverages. The thread diameter d1 is preferably, for example, 26 mm or more and 28 mm or less. The thread root diameter d2, that is, the diameter of the outer peripheral surface 15b is preferably, for example, 23 mm or more and 25 mm or less. It is preferable that the inner diameter d3 of the plug portion 15, that is, the diameter of the inner peripheral surface 15c is, for example, not less than 21 mm and not more than 23 mm. The outer diameter dA of the fogger 16 is preferably, for example, not less than 25 mm and not more than 32 mm. The outer diameter dB of the lower fogger 18 is preferably, for example, not less than 24 mm and not more than 27 mm.

  Above all, when the outer diameter dA of the fogger 16 is 25 mm or more, it is possible to prevent the PET bottle 10 from dropping from the gripper 84 or the like (see FIG. 5) at the time of the above-described conveyance, and at the time of conveyance, The required strength can be maintained when the cap 60 is mounted. On the other hand, when the outer diameter dA of the fogger 16 is 32 mm or less, it is possible to prevent the weight of the PET bottle 10 from increasing. Note that a relationship of dA> dB is established between the outer diameter dA of the fogger 16 and the outer diameter dB of the lower fog 18.

  The height h1 of the plug part 15 is preferably, for example, not less than 16 mm and not more than 22 mm. The height h2 from the upper end of the support ring 17 to the top surface 15a is preferably, for example, 14 mm or more and 20 mm or less. The height h3 from the lower end of the fogger 16 to the top surface 15a is preferably, for example, not less than 10 mm and not more than 15 mm. The pitch p of the outer screw 13 is preferably, for example, not less than 2.5 mm and not more than 3.5 mm.

  Further, it is more preferable that the plug portion 15 has a size corresponding to, for example, the Plastic Closure Only (PCO) 1810 standard or the PCO1881 standard. In particular, the outer diameter dA of the fogger 16 is more preferably 27.97 mm ± 0.13 mm from the viewpoint of the suitability of transporting the PET bottle 10 by a molding device, a filling device, and the like, and the function of preventing unauthorized opening of the cap 60. Further, from the viewpoint of fitting with the widely distributed cap 60, the thread diameter d1 is more preferably 27.43 mm ± 0.13 mm, and the pitch p of the external thread 13 is 3.18 mm (PCO1810 standard). ) And 2.70 mm (PCO1881 standard).

  Since the outer diameter dA, the thread diameter d1, and the pitch p of the outer screw 13 of the plug portion 15 and the pitch p of the outer screw 13 are in the above ranges, the shape of the existing molding device, filling device, and the like, and the shape of the cap 60 The weight of the plug portion 15 can be reduced and the plastic bottle excellent in airtightness can be provided without being changed.

  Further, when the content to be filled in the PET bottle 10 is, for example, a carbonated beverage, the PET bottle 10 may be tilted during the circulation of the transport wheel 81 or the like to suppress foaming at the time of filling, and may be further subjected to centrifugal force. . However, when the outer diameter dA of the fogger 16 is in the above-described range, it is possible to prevent problems such as the PET bottle 10 coming off the gripper 84 or the like.

  As described above, while there is a limitation on the change in the thread diameter d1, the thread root diameter d2 can be reduced. At this time, it is preferable that a relationship of 1.125 ≦ d1 / d2 ≦ 1.165 is established between the thread diameter d1 and the thread root diameter d2.

  If d1 / d2 is equal to or more than 1.125, the thread root diameter d2 becomes small, and the weight of the plug 15 can be reduced. On the other hand, if d1 / d2 is equal to or less than 1.165, the injection moldability when injection molding a preform (preliminary molded body) used in manufacturing the PET bottle 10 can be improved. Furthermore, if d1 / d2 is 1.165 or less, it is possible to prevent the strength of the plug portion 15 from decreasing, and prevent the plug portion 15 from being deformed by heating when the PET bottle 10 is blow-molded. can do. Furthermore, if d1 / d2 is equal to or less than 1.165, there is no gap between the existing cap 60 and the external screw 13, and the tightness of the PET bottle 10 can be maintained.

  Therefore, when the relationship between the thread diameter d1 and the thread root diameter d2 is within the above range, the weight of the plug portion 15 can be reduced without changing the shape of the existing cap 60. It is possible to provide a plastic bottle which maintains strength and is excellent in airtightness.

  The support ring 17 has an upper surface 17a inclined downward and outward, and a lower surface 17b that is flat in the horizontal direction. Preferably, a step 21 is formed on the upper surface 17a. The support ring 17 includes an outer region 22 located radially outward of the step 21 and an inner region 23 located radially inward of the step 21. According to the configuration in which the support ring 17 has the step 21, the volume of the support ring 17 can be reduced in a region outside the step 21, and the weight of the support ring 17 can be reduced. Further, according to the configuration in which the support ring 17 has the step 21, it is possible to prevent a problem that the support ring 17 is deformed by heating when the PET bottle 10 is blow-molded. In addition, the support ring 17 is not limited to the configuration illustrated in FIG. 6 and the like having two steps having one step 21, and may be a multi-step configuration having two or more steps 21. .

  FIG. 7 is a front view showing the support ring 17. The surface 22a of the outer region 22 of the support ring 17 is an inclined surface that is inclined downward outward. The angle α between the surface 22a of the outer region 22 and the lower surface 17b of the support ring 17 preferably satisfies 10 degrees <α <16 degrees. When the angle α exceeds 10 degrees, when the preform is injection-molded, it is possible to sufficiently spread the resin to the tip of the support ring 17, thereby improving the injection moldability and increasing the production efficiency. it can. Further, by providing the angle α, the thickness of the base can be ensured, and the strength of the support ring 17 is improved. On the other hand, when the angle α is less than 16 degrees, it is possible to prevent the height of the lower fogger 18 from being shortened, and to prevent the occurrence of transport failure when the PET bottle 10 is transported.

  Further, the surface 23a of the inner region 23 of the support ring 17 is also an inclined surface which is inclined downward outward. The angle β between the surface 23a of the inner region 23 and the lower surface 17b of the support ring 17 preferably satisfies β> α. Further, it is preferable that the angle β satisfies 20 degrees <β <60 degrees. When the angle β exceeds 20 degrees, injection moldability can be improved. Further, by providing the angle β, the thickness of the base can be secured, and the strength of the support ring 17 is improved. On the other hand, when the angle β is less than 60 degrees, it is possible to prevent the height of the lower fogger 18 from being shortened, and to prevent a transport failure when the PET bottle 10 is transported.

  Furthermore, it is preferable that the relationship of 1.5 <L1 / L2 <4.0 be established between the radial length L1 of the outer region 22 and the radial length L2 of the inner region 23. When the value of L1 / L2 exceeds 1.5, it is possible to prevent the weight of the PET bottle 10 from increasing. On the other hand, when the value of L1 / L2 is less than 4.0, the resin can sufficiently spread to the tip of the support ring 17 when the preform is injection-molded, and the injection moldability is improved. can do.

  Further, the thickness tA at the outer end of the support ring 17, that is, at the outer end of the outer region 22, is preferably 1.0 mm or more and 1.5 mm or less. When the thickness tA is 1.0 mm or more, when the preform is injection molded, it is possible to sufficiently spread the resin to the tip of the support ring 17, thereby improving the injection moldability and increasing the production efficiency. be able to. Further, when the thickness tA is 1.0 mm or more, the strength of the support ring 17 can be maintained. On the other hand, when the thickness tA is 1.5 mm or less, it is possible to prevent the height of the lower fogger 18 from being shortened, and to prevent a poor conveyance when the PET bottle 10 is conveyed.

  The lower flap 18 illustrated in FIG. 6 and the like has a uniform outer diameter dB along the direction (vertical direction) of the axis A (see FIG. 1) of the PET bottle 10. However, the lower fogger 18 is not limited to this shape. FIG. 8 is a front view showing a modified example of the lower flap 18.

  As illustrated in FIG. 8, the lower flap 18 is concentrically gripped by the gripper 84 and the like during transport, and further concentrically moves radially inward from the gripper 25. An annular groove 26 may be provided. According to the configuration having the annular groove 26 in the lower flap 18, the volume of the plug portion 15 can be further reduced, and the weight of the PET bottle 10 and the preform before molding can be further reduced.

  Next, the shape of the outer screw 13 will be described in detail. FIG. 9 is a sectional view showing the outer screw 13. The outer screw 13 has a linear upper surface straight portion 13d on the side (upper side) of the upper end 13a (see FIG. 6 and the like) of the outer screw 13 and a straight line on the side (lower side) of the fogger 16 in a sectional view. And a straight front end surface straight portion 13f on the outer side of the PET bottle 10. The upper surface straight portion 13d is inclined downward and outward, the lower surface straight portion 13e is inclined upward and outward, and the tip surface straight portion 13f extends in the vertical direction. The outer screw 13 has a straight upper surface straight portion 13d, a lower surface straight portion 13e, and a front end surface straight portion 13f. The PET bottle 10 is configured so as to be in contact with each other to improve the hermeticity.

  The upper surface straight portion 13d is connected to the outer peripheral surface 15b of the plug portion 15 via the first curved portion 13g, and is also connected to the distal end surface straight portion 13f via the second curved portion 13h. The lower surface straight portion 13e is connected to the distal end surface straight portion 13f via the third curved portion 13i, and is also connected to the outer peripheral surface 15b of the plug portion 15 via the fourth curved portion 13j. The first curved portion 13g and the fourth curved portion 13j are convex inward of the plug portion 15, and the second curved portion 13h and the third curved portion 13i are outwardly of the plug portion 15. It is convex.

  The vertical distance from the upper end of the first curved portion 13g to the lower end of the fourth curved portion 13j is the screw width wA of the external screw 13. It is preferable that the screw width wA of the outer screw 13 is 0.5 mm to 2.2 mm. When the screw width wA is 0.5 mm or more, it is possible to prevent the occurrence of a so-called short-circuit incomplete filling, which is called a short circuit, when injection molding a preform. On the other hand, when the screw width wA is 2.2 mm or less, it is possible to prevent the weight of the PET bottle 10 from increasing.

As described above, the external thread 13 according to the present embodiment can reduce the weight of the plug portion 15 by reducing the thread root diameter d2 while keeping the thread diameter d1 as it is (see FIG. 6). ). And the thread root part which indents most inwardly between the external threads 13 and 13 which adjoin in the cross-sectional view in the up-down direction, ie, the thread part which protrudes outmost of the screw from the outer peripheral surface 15b of the plug part 15, ie, It is preferable that the protruding height h4 from the front end surface straight portion 13f be 1.0 mm or more and 1.7 mm or less. That is, it is preferable that half of the difference between the thread diameter d1 and the thread root diameter d2 (see FIG. 6) is 1.0 mm or more and 1.7 mm or less.

  When the protrusion height h4 is 1.0 mm or more, it is possible to prevent the weight of the PET bottle 10 from increasing. On the other hand, when the protrusion height h4 is 1.7 mm or less, the injection moldability can be improved, and the strength of the outer screw 13 can be maintained. As described above, according to the configuration in which the protrusion height h4 from the thread root portion to the thread portion is 1.0 mm or more and 1.7 mm or less, the existing devices such as the capper and the shape of the cap 60 are changed. Thus, the PET bottle 10 in which the weight of the plug portion 15 is reduced can be provided.

  A first intersection V1 which is an intersection of an extension line L3 from the upper surface straight portion 13d and an extension line L5 from the tip surface straight portion 13f, and an intersection of an extension line L4 and an extension line L5 from the lower surface straight portion 13e. The distance between the second intersection point V2 and the outer end of the outer screw 13 is defined as the vertical width wD.

  The vertical width wD is preferably from 0.4 mm to 0.9 mm, more preferably from 0.5 mm to 0.7 mm. When the vertical width wD is 0.4 mm or more, more preferably 0.5 mm or more, the resin can sufficiently spread to the tip of the external screw 13 when the preform is injection-molded, and the injection moldability is improved. The manufacturing efficiency can be improved while improving the quality. Furthermore, the external screw 13 can hold the strength particularly required when the cap 60 is mounted. As described above, when the weight of the plug portion 15 is reduced by reducing the thread root diameter d2, deformation or damage due to collision with the flap 71 or the like at the time of mounting the cap 60 is performed. It is easy to occur. However, since the upper and lower width wD of the outer end of the outer screw 13 is in the above range, the strength is maintained and the cap 60 can be mounted without any problem.

  On the other hand, when the vertical width wD is 0.9 mm or less, more preferably 0.7 mm or less, it is possible to prevent the weight of the PET bottle 10 from increasing.

  Therefore, with the configuration in which the vertical width wD at the outer end of the outer screw 13 is 0.4 mm or more and 0.9 mm or less, more preferably 0.5 mm or more and 0.7 mm or less, the existing device and the shape of the cap 60 are reduced. The PET bottle 10 in which the weight of the plug unit 15 is reduced can be provided without being changed.

  Further, it is preferable that the angle δ between the extension line L4 and the extension line L5 on the acute angle side is not less than 60 degrees and not more than 80 degrees.

When the angle δ is 60 degrees or more, it is possible to prevent the weight of the PET bottle 10 from increasing. On the other hand, when the angle δ is equal to or less than 80 degrees, when the preform is injection-molded, the resin can sufficiently spread to the tip of the external screw 13 , thereby improving the injection moldability and manufacturing efficiency. Can be raised. Further, by providing the angle δ, the thickness of the base can be ensured, and the strength of the outer screw 13 is improved. When the angle δ is in the range of not less than 60 degrees and not more than 80 degrees, the inner screw 64 of the cap 60 to be wound and the lower surface straight portion 13e come into planar contact with each other, so that the tightness of the PET bottle 10 is reduced. Can be improved. Therefore, with such a configuration, it is possible to provide the PET bottle 10 in which the weight of the plug unit 15 is reduced without changing the shape of the existing device and the cap 60.

  Note that the angle formed between the extension line L3 and the extension line L5 on the acute angle side is preferably 60 degrees or more and 80 degrees or less.

  Next, the shape of the fogger 16 will be described in detail. FIG. 10 is a sectional view showing the fogger 16. The fogger 16 has, on the side of the external screw 13 (upper side), an inclined surface 16a that is inclined downward outward, and a lower surface 16b that is substantially horizontally flat on the side of the lower fog 18 (lower side). The fogger 16 allows the peeling ring 70 to get over the flap 71 (see FIG. 3) when tightening the cap 60, and restricts the flap 71 from getting over when the cap 60 is initially opened. Is configured to be separated from the cap 60. That is, the fogger 16 has an inclined surface 16a that allows the flap 71 to pass over in the downward direction, and a lower surface 16b that restricts the flap 71 from passing over in the upward direction. Further, the fogger 16 is configured to be gripped by the gripper 84 when the PET bottle 10 is transported as described above.

  The inclined surface 16a has a fifth curved portion 16c, a straight portion 16d, a sixth curved portion 16e, an outer peripheral portion 16f, and a seventh curved portion 16g from the outer screw 13 side (upper side). The fifth curved portion 16 c is convex inward of the plug portion 15 and is connected to the outer peripheral surface 15 b of the plug portion 15. The straight portion 16d is connected to the fifth curved portion 16c, and extends linearly outward and downward from the plug portion 15. The sixth curved portion 16e is convex outward of the plug portion 15, and is connected to the straight portion 16d. The outer peripheral portion 16f is connected to the sixth curved portion 16e and extends linearly in a direction parallel to the outer peripheral surface 15b (vertical direction). The seventh curved portion 16g is convex outward of the plug portion 15, is connected to the outer peripheral portion 16f, and is connected to the lower surface 16b.

  As described above, it is preferable that the inclined surface 16a of the fogger 16 includes the straight portion 16d that is linear in a sectional view. By providing the straight portion 16d, it is not necessary to make the sixth curved portion 16e large, the volume can be reduced in the region above the fogger 16, and the weight of the fogger 16 can be further reduced. Therefore, according to such a configuration, the weight of the plug unit 15 can be further reduced without changing the shapes of the existing gripper 84 and the cap 60.

  In addition, although it is more preferable that the inclined surface 16a includes the straight portion 16d, a configuration that does not include the straight portion 16d may be employed. However, in that case, it is necessary that the inclined surface 16a be inclined outward and downward with respect to the horizontal direction. With this configuration, the weight of the plug portion 15 can be reduced, and at the time of injection molding, the inclined surface 16a is prevented from being formed into a shape that cannot be removed from the mold. Further, the flap 71 of the cap 60 can easily get over the inclined surface 16a.

  The lower surface 16b is connected to the lower fogger 18 via an eighth curved portion 16h that is convex inward of the plug portion 15. The lower surface 16b is configured to incline upward and outward at an angle of 0 degree or more and 3 degrees or less with respect to a horizontal line. By configuring the lower surface 16b in this manner, the lower surface 16b can be reliably held by the gripper 84 and the like, and the flap 71 of the cap 60 can reliably contact the lower surface 16b to function as an unauthorized opening prevention function.

  The vertical distance from the upper end of the fifth curved portion 16c to the lower end of the lower surface 16b is the width wB of the fogger 16. The width wB is preferably 1.2 mm or more and 2.0 mm or less. By setting the width wB of the fogger 16 to be 1.2 mm or more, the flap 71 partially remains on the fogger 16 when the cap 60 is tightened, so that the cap 60 is mounted obliquely. Can be prevented. On the other hand, when the width wB of the fogger 16 is 2.0 mm or less, it is possible to prevent the weight of the PET bottle 10 from increasing.

  The distance between the horizontal line extending from the intersection of the eighth curved portion 16h and the lower surface 16b and the horizontal line extending from the intersection of the straight portion 16d and the sixth curved portion 16e is defined as the vertical width wC of the outer end of the fogger 16. Is done.

  The vertical width wC is preferably 0.3 mm or more and 1.0 mm or less. When the vertical width wC is 0.3 mm or more, the resin can sufficiently spread to the tip of the fogger 16 when the preform is injection-molded, thereby improving the injection moldability and increasing the production efficiency. Can be. Furthermore, the fogger 16 can maintain the strength particularly required when the preform and the PET bottle 10 are transported and when the cap 60 is attached. Further, when the vertical width wC is 1.0 mm or less, it is possible to prevent the weight of the PET bottle 10 from increasing. Therefore, by the configuration in which the vertical width wC of the outer end of the fogger 16 is 0.3 mm or more and 1.0 mm or less, the shapes of the existing gripper 84 and the cap 60 are not changed, and the weight of the plug portion 15 is reduced. It is possible to provide the PET bottle 10 in which the size is increased.

  The angle ε between the horizontal line extending from the intersection of the eighth curved portion 16h and the lower surface 16b and the extended line extending from the straight portion 16d is preferably 15 degrees or more and 50 degrees or less, and 15 degrees or more and 30 degrees or less Is more preferable.

  When the angle ε is 15 degrees or more, when the preform is injection-molded, the resin can be sufficiently spread to the tip of the fogger 16, and the injection moldability can be improved. Further, by providing the angle ε, the thickness of the base can be ensured, and the strength of the fogger 16 is improved. On the other hand, when the angle ε is 50 degrees or less, the weight of the PET bottle 10 can be prevented from increasing, and when the angle ε is 30 degrees or less, the weight of the PET bottle 10 can be further reduced. can do. Therefore, with such a configuration, it is possible to provide the PET bottle 10 in which the weight of the plug portion 15 is reduced without changing the shapes of the existing gripper 84 and the like and the cap 60.

Further, the outer peripheral portion 16f of the outer end of the fob 16 and the straight portion 16d of the inclined surface 16a are connected by a sixth curved portion 16e, and the radius of curvature R is 0.2 mm or more and 1.4 mm or less. Is preferred. When the radius of curvature R is 0.2 mm or more, the injection moldability can be improved, and the flap 71 can smoothly pass over the fogger 16 when the cap 60 is fastened. On the other hand, when the radius of curvature R is 1.4 mm or less, the thickness of the outer end of the fogger 16 can be secured, and the strength of the fogger 16 is improved. Therefore, according to the configuration in which the radius of curvature R is 0.2 mm or more and 1.4 mm or less, the shape of the existing gripper 84 and the like and the cap 60 are not changed, and the weight of the plug portion 15 can be further reduced. Can be provided.

Further, a projection height h5 from the lower fogger 18 to the outer end of the fogger 16, that is, half of the difference between the outer diameter dA of the fogger 16 and the outer diameter dB of the lower fogger 18 (see FIG. 6) is 1. It is preferable that it is 2 mm or more and 3.0 mm or less. When the protrusion height h5 is 1.2 mm or more, the injection moldability can be improved, and the PET bottle 10 can be prevented from dropping from the gripper 84 or the like (see FIG. 5) during transportation. it can. On the other hand, when the protrusion height h5 is 3.0 mm or less, it is possible to prevent the weight of the PET bottle 10 from increasing. As described above, according to the configuration in which the protrusion height h5 from the lower edge 18 to the outer end of the edge 16 is 1.2 mm or more and 3.0 mm or less, the shapes of the existing gripper 84 and the cap 60 are changed. Without the need, it is possible to provide the PET bottle 10 in which the weight of the plug portion 15 is reduced.

  The state in which the plug unit 15 configured as described above is fitted to the widely distributed cap 60 will be described in detail. FIG. 11 is a cross-sectional view showing a state in which the cap part 115 of the comparative example and the cap 60 are fitted. The plug portion 115 of the comparative example has an outer thread 113, a flap 116, and a support ring 117 on its outer peripheral surface 115b, but none of the features according to the present embodiment.

  FIG. 12 is a cross-sectional view showing the plug portion 15 of the comparative example superimposed on the plug portion 15 according to the present embodiment. In FIG. 12, hatching indicating a cross section is omitted.

  At the upper end of the plug portion 15, the volume of the chamfered portion 15d is reduced. Further, the volume of the outer peripheral surface 15b is reduced by the amount corresponding to the decrease in the thread root diameter d2 (see FIG. 6). Further, in the support ring 17, the volume of the outer region 22 located radially outward of the step 21 is reduced. The weight of the plug unit 15 is reduced by the reduced volume.

  Further, since the vertical width wD of the outer end of the outer screw 13 is configured to be short, the weight of the plug portion 15 is reduced. However, the PET bottle 10 is in close contact with the inner screw 64 of the cap 60 in a planar manner, and the sealing performance of the PET bottle 10 is high.

  Further, the inclined surface 16a of the fogger 16 has a straight portion 16d that is linear in cross section, so that the volume in the region above the inclined surface 16a is reduced. However, since the upper and lower widths wC of the outer ends of the foggers 16 are configured to have the minimum thickness that maintains the strength required when the PET bottle 10 is transported or filled, the existing gripper 84 or the like is used. And it can be used without changing the cap 60.

  On the other hand, in the plug portion 115 of the comparative example, since the upper and lower widths of the outer screw 113 are long, when the cap 60 is attached, the upper portion thereof, that is, the contact ring 66 and the outer ring 67 tend not to be in contact. Therefore, in the plug part 115 of the comparative example, compared to the plug part 15 according to the present embodiment, the sealing property is reduced due to an impact such as dropping, and the content tends to leak easily.

  Next, a preform used when manufacturing the PET bottle 10 according to the present embodiment will be described. FIG. 13 is a front view showing a preform 30 used when manufacturing the PET bottle 10 according to the present embodiment.

  The preform 30 according to the present embodiment includes a preform main body 31 and a plug portion 15 located above the preform main body 31. The preform main body 31 having a bottomed cylindrical shape has a substantially cylindrical body 31a and a substantially hemispherical bottom 31b. The configuration of the plug 15 of the preform 30 is the same as the configuration of the plug 15 of the PET bottle 10. The plug portion 15 has a screw (outer screw 13), a flap 16, a support ring 17, and a lower flap 18 on the outer peripheral surface 15 b thereof, and the upper and lower width wD of the outer end of the outer screw 13 ( 9) is 0.4 mm or more and 0.9 mm or less, more preferably 0.5 mm or more and 0.7 mm or less, and the inclined surface 16 a of the fogger 16 has a straight portion 16 d that is linear in cross section. The preform 30 also has the features of the PET bottle 10 according to the present embodiment, such as preferably being provided. Therefore, the preform 30 according to the present embodiment has the same effect as the PET bottle 10 according to the present embodiment.

  Furthermore, the frequency of collision of the preform 30 with the outer peripheral surface 15b (see FIG. 4) of the plug portion 15 and the outer peripheral surface of the bottom 31b of the other preform 30 in the chamfered portion 15d (see FIG. 4) is reduced. Increase compared to. However, since the collision site is the chamfered portion 15d, the occurrence of scratches on the top surface 15a (see FIG. 4) and the inner peripheral surface 15c (see FIG. 4) of the plug portion 15 can be reduced. Then, the occurrence of scratches on the plug portion 15 is reduced, so that the occurrence of scratches on the inner ring 65 and the contact ring 66 when the cap 60 is attached can be reduced. Therefore, in the preform 30 according to the present embodiment, there is also an effect that the sealing property of the plug portion 15 by the cap 60 can be improved.

  The preform 30 is manufactured by an injection molding device. The plug portion 15 according to the present embodiment is configured so that the resin can be sufficiently spread to the respective ends of the outer screw 13, the flap 16, and the support ring 17, so that the injection moldability is improved. In addition, the manufacturing efficiency can be increased. Furthermore, the plug portion 15 according to the present embodiment can be easily formed because the inclined surface 16a and the like are prevented from being removed from the mold during injection molding.

  The PET bottle 10 is manufactured by a blow molding machine after heating by a heating device. The plug portion 15 according to the present embodiment is configured so that the strength of the external screw 13, the hood 16, and the support ring 17 is maintained, and therefore, the plug is heated by heating when the PET bottle 10 is blow-molded. The problem that the part 15 is deformed can be prevented.

  The contents of the PET bottle 10 are filled with a filler. The plug portion 15 according to the present embodiment is configured so that the strength of the outer screw 13, the hood 16 and the support ring 17 is maintained, so that the PET bottle 10 can be used not only for aseptic filling but also for hot filling. Can be used.

  Further, since the plug portion 15 is formed to have a high sealing property inside the PET bottle 10 and is formed to have a winding angle θ that prevents the cap from jumping due to the pressure inside the PET bottle 10, A foaming solution such as a carbonated beverage can be filled as the content. Since the fogger 16 and the support ring 17 are configured so that the PET bottle 10 does not come off the gripper 84 or the like, the PET bottle 10 is tilted, and even a carbonated beverage filling device that may receive a more centrifugal force. Can be filled without any problem. Therefore, various filling devices can be applied to filling the PET bottle 10 according to the present embodiment.

  A cap 60 is attached to the PET bottle 10 by a capper. The capper is configured such that the cap 60 is plugged into the cap portion 15 and then the cap 60 is fastened. When the cap 60 is plugged, the flap 71 of the cap 60 collides with the outer screw 13 and the fogger 16. However, since the plug portion 15 according to the present embodiment is configured so that the strength of the outer screw 13, the hood 16 and the support ring 17 is sufficiently maintained, they are deformed or broken. This does not occur, and the tightness of the subsequent PET bottle 10 is also maintained. Furthermore, since the PET bottle 10 is lightened, the mesh with the widely distributed cap 60 is well formed, so that the inside of the PET bottle 10 is kept highly sealed.

  The PET bottle 10 thus formed, the contents to be filled in the PET bottle 10, and the PET bottle 10 by being attached to the plug portion 15 of the PET bottle 10 filled with the contents. A filling body is constituted by the cap 60 that seals the inside.

  In the PET bottle 10 according to the present embodiment, the screw width wA of the outer screw 13 and the vertical width wD of the outer end of the outer screw 13 are formed smaller. As described above, when the outer screw 13 has a thinner configuration, the cap 60 is more easily closed even when the tightening torque of the cap 60 is the same. If the outer screw 13 is configured to be too thin, there occurs a phenomenon that the capper is too closed even if the set value of the tightening torque of the capper is the lower limit. Therefore, in the PET bottle 10, it is preferable that the screw width wA of the outer screw 13 and the upper and lower width wD of the outer end of the outer screw 13 be formed within a range in which such a problem does not occur.

  The shape of the PET bottle 10 particularly below the support ring 17 is not limited to the example shown in FIG. 1 and may be any shape as long as it is formed by blow molding the preform 30. The shape of the pressure absorbing panel formed on the body 11c and the shape of the horizontal groove and the vertical groove can be freely designed.

  The PET bottle 10 according to the present embodiment is not limited by size, and can be applied to various sizes. For example, the volume of the PET bottle 10 may be 100 ml to 2000 ml.

  In the above description, an example was described in which PET was used as a material particularly suitable for the PET bottle 10 and the preform 30 according to the present embodiment. However, in the present embodiment, any material having suitability for blow molding may be used. Therefore, it is preferable that a thermoplastic resin is used as the material of the PET bottle 10 according to the present embodiment.

  As the thermoplastic resin constituting the PET bottle 10, besides polyethylene terephthalate, for example, thermoplastic polyesters such as polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyarylate, or a copolymer thereof, these resins, Alternatively, a blend with another resin is suitable, and particularly, an ethylene terephthalate-based thermoplastic polyester such as polyethylene terephthalate can be suitably used. Further, acrylonitrile resin, polyethylene, polypropylene, propylene-ethylene copolymer and the like can also be used. Further, a biomass-based plastic derived from a plant, for example, polylactic acid (PLA: PolyLactic Acid) can also be used.

  The above-mentioned resin is blended with various additives such as a colorant, an ultraviolet absorber, a release agent, a lubricant, a nucleating agent, an antioxidant, an antistatic agent and the like, as long as the quality of the molded article is not impaired. can do. The PET bottle 10 is preferably sterilized by adding hydrogen peroxide and peracetic acid.

  As the ethylene terephthalate-based thermoplastic resin constituting the PET bottle 10, most of the ester repeating part, generally 70 mol% or more, is occupied by ethylene terephthalate units, and the glass transition point (Tg) is 50 to 90 ° C. Those having a melting point (Tm) in the range of 200 to 275 ° C. are preferred. Further, as an ethylene terephthalate-based thermoplastic polyester, polyethylene terephthalate is particularly excellent in terms of pressure resistance and the like, but in addition to ethylene terephthalate units, diphthalic acids such as isophthalic acid and naphthalenedicarboxylic acid, and propylene glycol Copolymerized polyesters containing a small amount of ester units composed of diols such as diols can also be used.

  Further, the PET bottle 10 may be composed of two or more thermoplastic polyester layers. Further, when the PET bottle 10 is composed of two or more thermoplastic polyester layers, a barrier layer or an intermediate layer such as an oxygen absorbing layer can be provided between the layers. As the oxygen absorbing layer, a layer containing a combination of an oxidizable organic component and a transition metal catalyst, or a gas barrier resin that does not substantially oxidize can be used.

  The preform 30 according to the present embodiment can be effectively formed of a highly versatile material having both appropriate strength and plastic deformability according to the configuration of plastic, particularly PET. And plastics, especially PET, can be easily molded as the PET bottle 10, and the PET bottle 10 can be manufactured with a highly versatile device.

  As described above, the PET bottle 10 according to the present embodiment and the substantially cylindrical plug portion 15 of the preform 30 have the upper end portion 13a and the lower end portion 13b, and have the lower end portion 13a and the lower end portion 13a. An outer screw 13 helically projecting outward to the portion 13b; a flap 16 projecting outwardly in a loop below the outer screw 13; and a support ring 17 projecting outwardly in a circle below the flap 16 And a lower flap 18 formed concentrically between the flap 16 and the support ring 17, and the outer screw 13 is linearly formed in a sectional view on the side of the upper end 13 a of the outer screw 13 (upper side). The upper surface straight portion 13d, on the side (lower side) of the fogger 16, on the lower surface straight portion 13e that is linear in cross-sectional view, and on the outer side of the PET bottle 10 or the preform 30, the linear tip in cross-sectional view. With the surface straight portion 13f Then, a first intersection V1 which is an intersection of an extension line L3 from the upper surface straight portion 13d and an extension line L5 from the tip surface straight portion 13f, and an intersection of an extension line L4 and an extension line L5 from the lower surface straight portion 13e. The vertical width wD between the second intersection point V2 and the second intersection point V2 is 0.4 mm or more and 0.9 mm or less, more preferably 0.5 mm or more and 0.7 mm or less. It is possible to provide the PET bottle 10 in which the weight of the plug portion 15 is reduced and the preform 30 used when manufacturing the PET bottle 10 without changing the plug portion 15.

  Furthermore, the PET bottle 10 according to the present embodiment and the fogger 16 of the plug portion 15 of the preform 30 have a slope 16a on the side of the external screw 13 (upper side) and a side of the lower fog 18 (lower side). It has a horizontal lower surface 16b, and the inclined surface 16a of the fogger 16 has a straight portion 16d that is linear in a sectional view. Therefore, the shape of the existing device and the cap 60 is not changed, and the plug portion 15 is not changed. It is possible to provide a PET bottle 10 in which the weight of the PET bottle is reduced, and a preform 30 used when producing the PET bottle 10.

  Hereinafter, the present disclosure will be described in more detail and specifically with reference to examples. However, the present disclosure is not limited to the following examples.

<Material>
[Example 1]
The PET bottle 10 according to the present embodiment shown in FIG. 1 in which the injection-molded preform 30 according to the present embodiment shown in FIG. 13 was blow-molded was used. That is, in the plug portion 15 of the PET bottle 10, the inclined surface 16 a of the fogger 16 has a feature such as having a straight portion 16 d that is linear in cross section. The PET bottle 10 was made of polyethylene terephthalate, and the weight of the plug 15 was 4.3 g.

[Example 2]
The PET bottle 10 according to the present embodiment shown in FIG. 1 in which the injection-molded preform 30 according to the present embodiment shown in FIG. 13 was blow-molded was used. Unlike the first embodiment, the PET bottle 10 according to the second embodiment does not include the straight portion 16d. However, the sixth curved portion 16e is connected to the upper end of the outer peripheral portion 16f at the outer end of the fogger 16, and the radius of curvature thereof is set. R is 1.0 mm . That is, in the plug portion 15 of the PET bottle 10, a curved portion (sixth curved portion 16 e) is formed on the outer end of the fogger 16 on the upper side, and the curvature radius R of the curved portion is 0.2 mm or more. 0.4 mm or less. The PET bottle 10 was made of polyethylene terephthalate, and the weight of the plug 15 was 4.3 g.

[Comparative Example 1]
A PET bottle of Comparative Example 1 similar to that of Example 1 was used, except that the inclined surface of the fogger was not provided with a straight portion 16d that was linear in cross-sectional view, and was constituted by a curved surface. The weight of the plug was 5.1 g.

[Comparative Example 2]
The inclined surface of the fogger does not have the straight portion 16d that is linear in cross section, is formed of a curved surface, and has a curvature radius R of a curved portion connected to the upper side of the outer peripheral portion 16f of the outer end of the fogger. A PET bottle of Comparative Example 2 similar to that of Example 1 or Example 2 was used except that it was 2.0 mm outside the range of not less than 0.2 mm and not more than 1.4 mm . The weight of the plug was 4.3 g.

<Method>
10,000 bottles of each of Example 1, Example 2, Comparative Example 1, and Comparative Example 2 were prepared. The filling device gripped and conveyed the plug portion of each bottle, filled the carbonated beverage with the filler, and mounted the cap 60 by tapping and then tightening it with the capper. The cap 60 was a one-piece specification of a conventional cap, had a peeling ring 70, and had a tightening angle of 255 degrees.

(Evaluation of weight reduction)
Each of the bottles of Example 1, Example 2, Comparative Example 1, and Comparative Example 2 was evaluated for weight reduction. Table 1 shows the results of the evaluation of the reduction in weight, which are indicated by ○: less than 4.5 g, ×: 4.5 g or more.

(Transportability test)
Each of the bottles of Example 1, Example 2, Comparative Example 1, and Comparative Example 2 was transported by the filling device, and it was confirmed whether or not the transport of the bottle by the transport device was possible.

(Cap winding test)
A cap 60 was attached to each of the bottles of Example 1, Example 2, Comparative Example 1, and Comparative Example 2 by a capper, and the propriety of the cap was confirmed.

(Unplug opening test)
The caps of each of the bottles of Example 1, Example 2, Comparative Example 1, and Comparative Example 2 were opened by hand, and it was confirmed whether or not the peeling ring 70 was broken.

(Appearance check)
Similarly to the opening / closing test, whether the caps 60 of the bottles of Example 1, Example 2, Comparative Example 1, and Comparative Example 2 were opened by a human hand, and whether the fogger was deformed or damaged. Was visually confirmed.

(Comprehensive evaluation)
Based on the above-described evaluation of weight reduction, transportability test, cap wrapping capability test, opening capability test, and appearance confirmation, a total of each bottle of Example 1, Example 2, Comparative Example 1, and Comparative Example 2 was obtained. An evaluation was made. Table 1 shows the results of the comprehensive evaluation. The overall evaluation is indicated by ○: good, ×: not suitable.

  The following points have been derived from the embodiments described above. As shown in Table 1, Example 1 was reduced in weight and had transportability. Furthermore, the tightness of the cap 60 and the separation of the peeling ring 70 were good, and the fogger 16 did not deform or break, and the appearance was good. Example 2 was also reduced in weight as in Example 1, and had transportability. Furthermore, the tightness of the cap 60 and the separation of the peeling ring 70 were good, and the fogger 16 did not deform or break, and the appearance was good.

  Comparative Example 1 had transportability but was not lightened. In addition, the winding property of the cap 60 and the separation of the peeling ring 70 were good, and there was no deformation or breakage of the fog, and the appearance was good. In Comparative Example 2, although there was transportability, there was a case where mounting failure of the cap 60 occurred. Further, there were a case in which the peeling ring 70 was not separated, and a case in which the fog was deformed or damaged, resulting in poor appearance.

  From the results of the above examples, it was shown that the PET bottle 10 according to the present embodiment can reduce the weight of the plug portion 15 without changing the shape of the existing device and the cap 60. .

  The present disclosure is preferably applied to various containers in which a cap that is widely distributed is mounted in a manner in which a plug portion is gripped and delivered during molding or filling of a container, and the container is hermetically sealed. Can be used. The container is mainly filled with a liquid as a content. However, the present disclosure is not limited to the embodiments described above. Containers of the present disclosure, the contents, for example, green tea, oolong tea, black tea, coffee, fruit juice, various non-carbonated drinks such as soft drinks, and carbonated drinks, or soy sauce, sauces, seasonings such as mirin, cooking oil, alcohol It is useful for all containers that contain foods, including detergents, shampoos, cosmetics, pharmaceuticals, and the like, and is suitable for sales by vending machines and the like because containers can be loaded sideways. Further, the present invention can be used not only for a liquid but also for a container filled with a powder.

10 PET bottles (plastic bottles)
13 Outer thread (screw)
13a Upper end of external screw 13b Lower end of external screw 13d Upper linear part of external screw 13e Lower linear part of external screw 13f Linear part of front end of external screw 15 Plug part 16 Flap 16a Inclination face of flap 16b Lower face of flap 16d Straight portion of inclined surface of fogger 16e Sixth curved portion (curved portion) of fogger
17 support ring 18 flap lower 30 preform 60 cap d1 thread diameter (outer diameter of outer screw)
dA Outer diameter of flap h4 Projection height from thread root to thread h5 Protrusion height from below flap to outer edge of flap L3 Extension from upper straight section L4 Extension from lower straight section L5 Tip straight Extension from the part p Pitch of the external thread R Radius of curvature of the sixth curved part of the cover V1 First intersection V2 Second intersection wC Vertical width of the outer end of the cover wD First intersection at the outer end of the external screw Δ Angle between extension line L4 and extension line L5 of external thread ε Angle between inclined surface and lower surface of fogger θ Winding angle

Claims (15)

In a plastic bottle comprising a bottle body and a substantially cylindrical plug portion located above the bottle body,
The spout portion,
A screw having an upper end and a lower end and projecting helically outward from the upper end to the lower end;
A flap that protrudes outward in a circular shape below the screw,
A support ring that protrudes outward in a circular shape below the fogger;
A lower fogger formed concentrically between the fogger and the support ring,
The fogger,
The upper slope,
A lower, substantially horizontal lower surface,
The inclined surface of the fogger has a straight portion that is linear in cross section,
The lower surface of the fogger is inclined upward, outwardly, at an angle of more than 0 degrees with respect to a horizontal line, and at most 3 degrees,
The width of the fogger is 1.2 mm or more and 2.0 mm or less,
The vertical width of the outer end of the screw is 0.4 mm or more, 0.9 mm or less,
The upper and lower widths of the outer edge of the fogger are 0.3 mm or more and 1.0 mm or less. In a plastic bottle comprising a bottle body and a substantially cylindrical plug portion located above the bottle body,
The spout portion,
A screw having an upper end and a lower end and projecting helically outward from the upper end to the lower end;
A flap that protrudes outward in a circular shape below the screw,
A support ring that protrudes outward in a circular shape below the fogger;
A lower fogger formed concentrically between the fogger and the support ring,
The fogger,
The upper slope,
A lower, substantially horizontal lower surface,
At the outer end of the fogger, a curved portion is formed on the upper side,
The radius of curvature of the curved portion is 0.2 mm or more and 1.4 mm or less,
The lower surface of the fogger is inclined upward, outwardly, at an angle of more than 0 degrees with respect to a horizontal line, and at most 3 degrees,
The width of the fogger is 1.2 mm or more . 0 mm or less,
The vertical width of the outer end of the screw is 0.4 mm or more, 0.9 mm or less,
The upper and lower widths of the outer edge of the fogger are 0.3 mm or more and 1.0 mm or less. The plastic bottle according to claim 2, wherein the inclined surface of the fogger includes a straight portion that is linear in a cross-sectional view. The plastic bottle according to any one of claims 1 to 3, wherein an angle between the inclined surface and the lower surface is 15 degrees or more and 50 degrees or less. The outer diameter of the fogger is not less than 25 mm and not more than 32 mm,
The outer diameter of the screw is 26 mm or more and 28 mm or less,
The plastic bottle according to any one of claims 1 to 4, wherein a pitch of the screw is 2.5 mm or more and 3.5 mm or less. The plastic bottle according to any one of claims 1 to 5, wherein a winding angle of the screw from the upper end to the lower end is 550 degrees or more and 800 degrees or less. The plastic bottle according to any one of claims 1 to 6, wherein a protruding height from below the fogger to an outer end of the fogger is 1.2 mm or more and 3.0 mm or less. In a preform comprising a preform body and a substantially cylindrical plug portion located above the preform body,
The spout portion,
A screw having an upper end and a lower end and projecting helically outward from the upper end to the lower end;
A flap that protrudes outward in a circular shape below the screw,
A support ring that protrudes outward in a circular shape below the fogger;
A lower fogger formed concentrically between the fogger and the support ring,
The fogger,
The upper slope,
A lower, substantially horizontal lower surface,
The inclined surface of the fogger has a straight portion that is linear in cross section,
The lower surface of the fogger is inclined upward, outwardly, at an angle of more than 0 degrees with respect to a horizontal line, and at most 3 degrees,
The width of the fogger is 1.2 mm or more and 2.0 mm or less,
The vertical width of the outer end of the screw is 0.4 mm or more, 0.9 mm or less,
A preform, wherein an upper and lower width of an outer end of the fogger is 0.3 mm or more and 1.0 mm or less. In a preform comprising a preform body and a substantially cylindrical plug portion located above the preform body,
The spout portion,
A screw having an upper end and a lower end and projecting helically outward from the upper end to the lower end;
A flap that protrudes outward in a circular shape below the screw,
A support ring that protrudes outward in a circular shape below the fogger;
A lower fogger formed concentrically between the fogger and the support ring,
The fogger,
The upper slope,
A lower, substantially horizontal lower surface,
At the outer end of the fogger, a curved portion is formed on the upper side,
The radius of curvature of the curved portion is 0.2 mm or more and 1.4 mm or less,
The lower surface of the fogger is inclined upward, outwardly, at an angle of more than 0 degrees with respect to a horizontal line, and at most 3 degrees,
The width of the fogger is 1.2 mm or more . 0 mm or less,
The vertical width of the outer end of the screw is 0.4 mm or more, 0.9 mm or less,
A preform, wherein an upper and lower width of an outer end of the fogger is 0.3 mm or more and 1.0 mm or less. The preform according to claim 9, wherein the inclined surface of the fogger includes a straight portion that is linear in cross section. Wherein the inclined surface, the angle between the bottom surface 15 degrees or more, the preform according to any one of claims 8 to 1 0, characterized in that at most 50 degrees. The outer diameter of the fogger is not less than 25 mm and not more than 32 mm,
The outer diameter of the screw is 26 mm or more and 28 mm or less,
The pitch of the said screw is 2.5 mm or more and 3.5 mm or less, The preform as described in any one of Claims 8 thru | or 11 characterized by the above-mentioned. The winding angle from the upper end of the screw to the lower end 550 degrees or more, the preform according to any one of claims 8 to 1 2 and equal to or less than 800 degrees. The projection height from the bottom turnip to the outer end of the turnip is 1.2mm or more, the preform according to any one of claims 8 to 1 3, characterized in that it is 3.0mm or less. A plastic bottle according to any one of claims 1 to 7, and
Contents to be filled in the plastic bottle,
A cap to be attached to the plug portion of the plastic bottle,
The filling, wherein the content is a foamable solution.

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