JP7296697B2 - plastic bottle - Google Patents

Description

FIELD OF THE INVENTION The present invention relates to a plastic bottle having a body portion with at least one vacuum absorbing panel portion and a body reference surface formed around the vacuum absorbing panel portion.

2. Description of the Related Art In the process of manufacturing beverages filled in plastic bottles, so-called hot filling, in which heated beverages are filled, may be performed. In such a case, after the beverage is hot-filled, the mouth is closed with a cap or the like, and the internal pressure decreases as the beverage cools, which may cause the plastic bottle to collapse and deform. In order to prevent such problems, it is common to provide a vacuum absorption panel on the body of the plastic bottle.

For example, Patent Literature 1 discloses a plastic bottle comprising vacuum absorption walls formed of inclined panels inclined with respect to the axis of the plastic bottle, and column walls arranged alternately with the vacuum absorption walls. It is The plastic bottle has succeeded in imparting a vacuum absorption function, as well as shapeability in blow molding and resistance to external impact force.

JP 2013-95428 A

By the way, the vacuum absorption part provided in the plastic bottle as in Patent Document 1 is likely to cause a dent (so-called sink mark) due to shrinkage during bottle molding. It had problems in terms of strength, such as being easily deformed. Therefore, in some cases, production conditions in the process of molding plastic bottles and filling beverages are restricted so that such deformation defects do not occur. Such restrictions could become a factor that impairs productivity in the production of plastic bottles and the production of beverages.

Therefore, it is desired to realize a plastic bottle that has a vacuum absorption function and at the same time has high strength.

A plastic bottle according to the present invention is a plastic bottle having a body portion including a vacuum absorption panel portion and a body portion reference surface formed around the vacuum absorption panel portion, wherein the vacuum absorption panel portion comprises: It extends in the vertical direction of the body portion and is provided in a shape twisted in the circumferential direction around the central axis of the plastic bottle, and the pressure reduction absorption panel portion includes a first recess, a second recess, a convex portion, wherein the first concave portion is planar and is recessed from the body portion reference surface toward the inside of the plastic bottle; and the second concave portion extends around the first concave portion. In the center of the direction, it is provided so as to further sink from the first recess toward the inside of the plastic bottle. A curved surface that protrudes from the first concave portion toward the outside of the plastic bottle is formed over the entire width of the convex portion, and the width of the convex portion in the vertical direction is A ridge portion is formed at a portion where two of the trunk reference surfaces extending from two adjacent vacuum absorption panel portions meet, and the trunk portion A distance of the reference plane from the central axis is maximum at the ridge portion.

According to this configuration, the first concave portion and the second concave portion work together to exhibit a good reduced pressure absorption function, and the twisted shape of the reduced pressure panel portion realizes high strength in the vertical direction. can do. In addition, since the pressure reduction absorption panel portion has a convex portion, deformation of the first concave portion and the second concave portion can be suppressed, making it difficult to cause sink marks during molding, and even when pressure is applied during filling. can also be made difficult to deform. In addition, since the ridge portion is twisted together with the decompression panel portion, it is possible to achieve even higher strength in the vertical direction.

Preferred embodiments of the present invention are described below. However, the scope of the present invention is not limited by the preferred embodiments described below.

Further features and advantages of the invention will become clearer from the following description of exemplary and non-limiting embodiments described with reference to the drawings.

Front view of a plastic bottle. Front sectional view of a plastic bottle. III-III sectional view in FIG. IV-IV sectional view in FIG. The front enlarged view of the trunk|drum of a plastic bottle. VI-VI sectional view in FIG. VII-VII cross-sectional view in FIG. Bottom view of the bottom of the plastic bottle. FIG. 4 is an enlarged view of the bottom of a recess provided in the bottom of the plastic bottle.

An embodiment of a plastic bottle according to the present invention will be described with reference to the drawings. As shown in FIG. 1, the plastic bottle 100 according to the present embodiment includes a mouth portion 1 as a liquid pouring spout, a shoulder portion 2 continuous with the mouth portion 1 and gradually increasing in diameter toward the bottom surface, and a shoulder portion. It is composed of a cylindrical body portion 3 that is continuous with the portion 2 and a bottom portion 4 that serves as the bottom of the plastic bottle 100 . In the following description, the “depth” of each structure provided on the surface of the plastic bottle 100 is defined as the depth of penetration from the surface of the plastic bottle 100 into the inside.

The plastic bottle 100 according to the present embodiment can be integrally molded using a thermoplastic resin such as polyethylene, polypropylene, or polyethylene terephthalate as a main material by a stretch molding method such as biaxial stretch blow molding. The capacity of the plastic bottle 100 is not particularly limited, and can be about 200 mL to 2 L, such as 280 mL, 350 mL, and 500 mL, which are generally distributed. Moreover, the liquid to be filled in the plastic bottle 100 is not particularly limited. seasonings, etc.

[Rib structure]
A concave main peripheral rib 31 is provided in the upper region 3 a of the body portion 3 . In addition, recessed sub-peripheral ribs 32 are provided in the upper region 3 a and the lower region 3 c of the body 3 . As shown in FIG. 2 , the main peripheral rib 31 is formed to have a greater depth and vertical width than the secondary peripheral rib 32 .

As shown in FIG. 3, the main circumferential rib 31 has a wave-like horizontal cross-sectional shape whose depth continuously changes along the circumferential direction of the plastic bottle 100, and the maximum depth is 4.5 mm. and the minimum value is 3.5 mm. The main circumferential rib 31 has seven points 31a where the depth is maximum and seven points 31b where the depth is minimum. It is a wavy shape in which a point 31a having a maximum value and a point 31b having a minimum depth are alternately and smoothly connected. That is, the horizontal cross-sectional shape is convex in the outward direction of the plastic bottle around the point 31a where the depth is the maximum value, and is convex in the inside direction of the plastic bottle around the point 31b where the depth is the minimum value. It is a convex closed curve having an inflection point between a point 31a at which the depth is maximum and a point 31b at which the depth is minimum.

The width of the main circumferential rib 31 in the vertical direction is 8.0 mm at the point 31a where the depth is maximum and 7.2 mm at the point 31b where the depth is minimum.

As shown in FIGS. 1 and 2, a plurality of sub-peripheral ribs 32 may be provided, and in this embodiment, three sub-peripheral ribs 32 are provided in the upper region 3a and two in the lower region 3c. In this embodiment, the sub-peripheral rib 32 has a circular horizontal cross-sectional shape, a depth of 1.5 mm, and a vertical width of 4.9 mm.

When a horizontal load is applied to the plastic bottle 100, the load can deform the horizontal cross-sectional shape of the plastic bottle 100 into an elliptical shape. However, since the plastic bottle 100 according to the present embodiment has a wavy horizontal cross-sectional shape of the main circumferential rib 31, a structure in which the load is less likely to be concentrated is realized, so the plastic bottle 100 is less likely to be deformed.

Also, when a vertical load is applied to the plastic bottle 100, the plastic bottle may be deformed in the vertical direction. However, the plastic bottle 100 according to the present embodiment includes the main peripheral rib 31 and the secondary peripheral rib 32 having different depths and widths. Since a mitigating action is exhibited, deformation of the plastic bottle 100 is less likely to occur.

[Panel structure]
In the middle region 3b of the body portion 3, a plurality of (six in this embodiment) panels 33 (example of vacuum absorption panel portion) recessed in the radial direction are arranged in the circumferential direction of the middle region 3b and formed at regular intervals. ing. As shown in FIG. 5, the panel 33 has a shape extending vertically in the middle region 3b, and is provided in a shape twisted in the circumferential direction around the central axis of the plastic bottle 100. As shown in FIG. A trunk reference surface 34 is formed around the panel 33 .

As shown in FIGS. 5 to 7, the panel 33 includes a panel first concave portion 33a (example of first concave portion), a panel second concave portion 33b (example of second concave portion), and a panel convex portion 33c (example of convex portion). ), has The panel first concave portion 33a has a planar shape and is provided so as to be depressed toward the inside of the plastic bottle 100 from the body portion reference surface 34. As shown in FIG. The panel second recess 33b is provided in the center of the panel first recess 33a in the circumferential direction so as to sink further toward the inside of the plastic bottle 100 from the panel first recess 33a.

The panel protrusion 33c is a curved surface in which both ends in the up-down direction of the panel first recess 33a protrude from the panel first recess 33a toward the outside of the plastic bottle 100 over the entire width of the panel first recess 33a in the circumferential direction. is formed as The width of the panel protrusion 33c in the vertical direction is the smallest at both ends in the circumferential direction of the panel protrusion 33c and the largest at the central portion in the circumferential direction of the panel protrusion 33c.

A ridge portion 34a is formed at a portion where two body portion reference surfaces 34 extending from the two panel first recess portions 33a meet. The distance of the body reference plane 34 from the central axis of the plastic bottle 100 is maximum at the ridge 34a.

The plastic bottle 100 according to this embodiment achieves reinforcement of the panel 33 by having the panel projection 33c. Therefore, problems due to deformation, such as radially outward deformation that occurs when pressurizing the bottle to fill the beverage, and dents (so-called sink marks) that occur due to shrinkage during bottle molding, are less likely to occur.

[Bottom structure]
As shown in FIGS. 5, 8, and 9, the bottom portion 4 includes a grounding portion 41 that is grounded on an installation surface such as a desk, and the inside of the plastic bottle 100 (in FIG. A dome portion 42 projecting upward) is formed. A dome central portion 421 is provided in the central portion of the dome portion 42 and protrudes further into the plastic bottle 100 than the dome portion 42 , and a plurality of bottom concave portions 422 are provided around the dome central portion 421 .

As shown in FIG. 9, the bottom recessed portion 422 has a recessed hexagonal shape (a so-called bowtie shape) having four convex apexes 422a with an internal angle of 70° and two concave apexes 422b with an internal angle of 220° in plan view. shape). Here, the two vertices adjacent to the convex vertex 422a are the convex vertex 422a and the concave vertex 422b, and the two vertices adjacent to the concave vertex 422b are the two convex vertices 422a. Each side of the concave hexagon has a length of 3 mm, and the longest diagonal of the diagonals of the concave hexagon has a length of 6 mm. Also, the depth of the bottom recess 422 is 1.2 mm.

As shown in FIGS. 8 and 9, the bottom recesses 422 form a bottom recess row 423 in which a plurality of bottom recesses 422 are arranged in a row. In the bottom recessed portion row 423, the plurality of bottom recessed portions 422 are arranged along the central axis _CA which is an extension of the center line _CL connecting the center points of the two sides sandwiched between the two convex vertexes 422a _. are placed adjacent to each other so as to match the

As shown in FIGS. 8 and 9, the plurality of rows of bottom recessed portions 423 are arranged so that their central axes _CA are parallel to each other. Also, the two bottom recessed rows 423a, 423b adjacent to each other are offset from each other along the central axis _CA , and the width of the offset is half the length (5.2 mm) of the center line _CL . 2.6 mm, which corresponds to Here, the term "offset" means that a straight line connecting the two concave apexes 422b of the bottom recessed portions 422 belonging to one bottom recessed portion row 423a is two recessed portions of the bottom recessed portions 422 belonging to the other bottom recessed portion row 423b. It means that the plurality of rows of bottom recesses 423 are staggered along the central axis _CA so as not to coincide with the straight line connecting the vertices 422b, and the term "offset width" refers to the distance between the straight lines. show.

Furthermore, three bottom recesses 422 adjacent to each other are arranged in such a manner that two convex apexes 422a and one concave apex 422b are brought close to each other. In other words, each adjacent convex apex 422a of each of the two adjacent bottom recessed portions 422 belonging to the bottom recessed portion row 423a is located outside of the recessed apex 422b of the bottom recessed portion 422 belonging to the bottom recessed portion row 423b in plan view. It is arranged so as to fit in when viewed (part A in FIG. 9). Such an inset structure is formed wherever the three bottom recesses 422 are adjacent.

When pressurizing a conventional plastic bottle to fill the bottle with a beverage, the bottle may be deformed in such a manner that the bottom portion thereof is pushed downward by the internal pressure. Since the plastic bottle 100 according to this embodiment has a structure in which the bottom recesses 422 are fitted into each other as described above, movement of the bottom recesses 422 along the bottom surface is regulated, and as a result, deformation of the bottom 4 is prevented. . As a result, the plastic bottle 100 acquires resistance to a load that can cause deformation, and the effect that the plastic bottle 100 as a whole is less likely to deform can be obtained.

[Other embodiments]
Finally, another embodiment of the plastic bottle according to the present invention will be described. It should be noted that the configurations disclosed in the respective embodiments below can also be applied in combination with configurations disclosed in other embodiments unless there is a contradiction.

In the above embodiment, the configuration in which one main circumferential rib 31 is provided has been described as an example. However, without being limited to such a configuration, the plastic bottle according to the present invention may have a plurality of circumferential ribs. However, from the viewpoint of effectively exerting the effect of alleviating the load in the vertical direction, it is preferable to have one main peripheral rib as in the above embodiment, and at least one secondary peripheral rib is provided in addition to the main peripheral rib. It is preferred to have at least five secondary peripheral ribs in addition to the main peripheral rib.

In the above embodiment, the main peripheral rib 31 has seven points 31a where the depth is maximum and seven points 31b where the depth is minimum. However, without being limited to such a configuration, the number of points at which the depth of the main circumferential rib has the maximum value and the point at which the depth of the main circumferential rib has the minimum value may be any number as long as they are the same number and plural. However, since the effect of avoiding the concentration of the load in the horizontal direction can be effectively expressed, it is preferable to have 6 to 9 points where the depth of the main circumferential rib takes the maximum value and the point where the depth takes the minimum value, respectively.

In the above-described embodiment, the maximum depth of the main circumferential rib 31 is 4.5 mm and the minimum depth is 3.5 mm. However, without being limited to such a configuration, the maximum depth of the circumferential rib may be 4.0-5.5 mm, and the minimum may be 0.5-1.5 mm less than the maximum. . The maximum depth of the circumferential rib is preferably 4.1 to 5.2 mm, more preferably 4.2 to 5.0 mm. The minimum depth of the circumferential rib is preferably 0.6 to 1.4 mm smaller than the maximum depth, more preferably 0.7 to 1.3 mm smaller.

In the above embodiment, the vertical width of the main circumferential rib 31 is 8.0 mm at the point 31a where the depth is maximum and 7.2 mm at the point 31b where the depth is minimum. explained as an example. However, without being limited to such a configuration, the vertical width of the circumferential rib may be 6 to 9 mm. The vertical width of the circumferential rib is preferably 6.2 to 8.8 mm, more preferably 6.5 to 8.5 mm.

In the above-described embodiment, the configuration in which the ridge portion 34a is formed at the portion where the two body portion reference surfaces 34 extending from the two panel first recess portions 33a meet has been described as an example. However, without being limited to such a configuration, for example, a planar connecting portion may be provided in the area where the two trunk reference surfaces meet.

In the above embodiment, the configuration in which the panel first concave portion 33a has a planar shape has been described as an example. However, without being limited to such a configuration, for example, the first recess may have ribs for absorbing reduced pressure.

In the above-described embodiment, the configuration in which the interior angle of the convex apex 422a is 70 degrees and the interior angle of the concave apex 422b is 220 degrees has been described as an example. However, without being limited to such a configuration, the interior angle of the convex apex may be more than 60° and less than or equal to 80°. The internal angle of the convex apex is preferably 63° or more and 87° or less, more preferably 65° or more and 75° or less.

In the above-described embodiment, the configuration in which the longest diagonal of the diagonals of the concave hexagon has a length of 6 mm has been described as an example. However, without being limited to such a configuration, the diagonal may have a length of 3 to 8 mm. The length of the diagonal line is preferably 4 to 7 mm, more preferably 5 to 7 mm.

In the above embodiment, the configuration in which the depth of the bottom recessed portion 422 is 1.2 mm has been described as an example. However, without being limited to such a configuration, the depth of the bottom recess may be 0.6 to 2.4 mm. The depth of the bottom recess is preferably 0.5 to 2.5 mm, more preferably 0.7 to 2.3 mm.

In the above embodiment, the offset width of the two adjacent bottom recessed rows 423a and 423b is 2.6 mm, which is half the length (5.2 mm) of the center line _CL . However, without being limited to such a configuration, the width of the offset may be 40-60% of the length of the centerline. The offset width is preferably 45 to 55%, more preferably 48 to 52%, and particularly preferably 50% of the length of the center line.

Regarding other configurations, it should be understood that the embodiments disclosed in this specification are examples in all respects, and that the scope of the present invention is not limited by them. Those skilled in the art will easily understand that modifications can be made as appropriate without departing from the scope of the present invention. Therefore, other embodiments modified without departing from the gist of the present invention are naturally included in the scope of the present invention.

INDUSTRIAL APPLICABILITY The present invention can be used, for example, for soft drink containers.

100: Plastic bottle 1: Mouth 2: Shoulder 3: Body 3a: Upper region of body 3b: Middle region of body 3c: Lower region of body 31: Main peripheral rib 32: Sub-peripheral rib 33: Panel 33a: Panel first concave portion 33b: Panel second concave portion 33c: Panel convex portion 34: Body portion reference surface 34a: Ridge portion 4: Bottom portion 41: Ground portion 42: Dome portion 421: Dome central portion 422: Bottom concave portion 422a: Convex apex of bottom recess 422b: Concave apex of bottom recess 423 (423a, 423b): Row of bottom recesses _CA : Central axis _CL : Center line A: Interfitting portion of bottom recesses

Claims (1)

A plastic bottle comprising a body portion including a vacuum absorption panel portion and a body portion reference surface formed around the vacuum absorption panel portion,
The vacuum absorption panel portion extends in the vertical direction of the body portion and is provided in a shape twisted in the circumferential direction around the central axis of the plastic bottle,
The reduced pressure absorption panel section has a first recess, a second recess, and a protrusion,
The first recess is planar and is recessed from the body reference surface toward the inside of the plastic bottle,
The second recess is provided in the center of the first recess in the circumferential direction so as to further sink from the first recess toward the inside of the plastic bottle,
The convex portion has a curved surface that protrudes from the first concave portion toward the outside of the plastic bottle over the entire width of the first concave portion in the circumferential direction at both ends of the first concave portion in the vertical direction. is a
the width of the protrusion in the vertical direction is the smallest at both ends in the circumferential direction of the protrusion and the largest at the central portion in the circumferential direction of the protrusion;
forming a peak-shaped portion at a portion where two said trunk reference surfaces extending from two adjacent vacuum absorption panel portions meet;
A plastic bottle in which the distance from the central axis of the body reference plane is greatest at the ridge.

Images