KR100951806B1 - Synthetic resin bottle - Google Patents

Abstract

Provided is a synthetic bottle that provides excellent sealing between the opening and the plastic cap. The male screw part 3 is formed and has the opening 2 heat-crystallized. A plastic cap (6) having a top plate (7), a cylindrical portion (8) having a female screw portion (9), a side seal portion (10), and a cap liner (11), and screwed to an opening portion (2). ). The opening 2 has a top plate abutment portion 15 which abuts on the top plate 7 via a cap liner 11, and a side seal abutment portion 16 which abuts on the side seal portion 10 via a cap liner 11. Equipped. The side seal abutting portion 16 has an annular protrusion 17. The annular protrusion 17 has a substantially semi-circular cross-sectional contour and is connected to the top plate abutting portion 15 successively through the curved portion 18 having the cross-sectional contour, and the top plate 7 is connected from the end of the side seal portion 10. It is press-contacted to the cap liner 11 at the side part. The arc-shaped cross-sectional contour has a radius in the range of 0.4 to 0.8 mm. The annular projection 17 is formed to protrude in the range of 0.03 to 0.2 mm on one side.

Plastic bottle, opening, top plate, cylinder, side seal, cap liner, plastic cap

Description

Synthetic Resin Bottle {SYNTHETIC RESIN BOTTLE}

The present invention relates to a plastic bottle having a thermally crystallized opening.

Background Art Conventionally, synthetic resin bottles formed by biaxially stretching blow molding of preforms made of synthetic resins such as polyethylene terephthalate are known. The synthetic resin bottle is lightweight and has been widely used as a container for various beverages because of its excellent transparency, impact resistance and gas barrier properties.

As shown in Fig. 1, the synthetic resin bottle 1 has an external threaded portion 3, an opening 2 formed with a bead ring 4 below, and a plastic opening in the opening 2. The cap 6 is threadedly attached. The opening part 2 shown in FIG. 1 is called a PCO opening cylinder part, and weight reduction is aimed at by reducing the upper and lower widths of the bead ring 4.

When the synthetic resin bottle 1 is made of a container such as a fruit juice, coffee, oolong tea or Japanese tea, the contents are hot-filled at a temperature of about 90 ° C. At this time, since the trunk portion and the bottom part of the synthetic resin bottle 1 not shown are biaxially stretched, they have heat resistance, but since the openings 2 are not stretched at all, they do not have heat resistance as they are, and may cause deformation. have. Therefore, heat resistance is provided by thermally crystallizing the openings 2 and whitening them.                 

In the synthetic resin bottle 1, the plastic cap 6 is screwed to the thermally crystallized opening 2 after the contents are hot charged as described above. The plastic cap 6 is screwed to the opening 2 by screwing the female screw 9 provided on the inner surface side of the cylindrical portion 8 to the male screw 3 of the opening 2. .

2, the cap liner 11 is provided in the inner surface of the top plate 7 and the side seal part 10, as shown in FIG. The opening 2 has a top plate abutment 15 abutting on the top plate 7 through the cap liner 11, while the side seal abutment 16 is connected to the side seal 10 through the cap liner 11. Touches. As a result, the sealing property of the plastic cap 6 and the opening part 2 is ensured.

Moreover, the plastic cap 6 is equipped with the skirt part 13 connected to the lower part of the cylindrical part 8 via the entanglement part 12, and the fin shape provided in the inner peripheral side of the skirt part 13 is carried out. The engaging portion 14 is prevented from engaging by engaging the bead ring 4 of the opening portion 2. As a result, the plastic cap 6 cannot be opened unless the entangled portion 12 is broken by rotating along the screw portions 3 and 9, and the unopened display function (generally tampered by the broken portion of the entangled portion 12). Evidence or Philfurfurfur). At this time, the side seal abutment portion 16 is provided with a side seal portion through the cap liner 11 until the entanglement portion 12 breaks in order to maintain the sealing property between the opening portion 2 and the plastic cap 6. It is necessary to touch (10).

By the way, when the opening part 2 is heated by the said hot filling, the front-end part falls into the inner surface side by the fastening torque at the time of screw-fitting the plastic cap 6, and this tip-end part will become diameter smaller than a base part. The tip is deformed into a tapered shape. When the opening 2 is deformed as described above, the contact between the side seal abutting portion 16 and the cap liner 11 is insufficient at the distal end of the opening 2, and the plastic cap 6 is rotated to open the stopper. At this time, only the plastic cap 6 has moved slightly upward, so that leakage occurs easily between the side seal abutting portion 16 and the cap liner 11, and the plug opening angle and so-called leak angle are reduced.

In the plastic cap 6 having the unsealed display function by breaking of the entangled portion 12, maintaining the sealing property between the opening 2 and the plastic cap 6 until the entangled portion 12 breaks. For this reason, the leak angle is preferably 100 ° or more. However, if the leak angle becomes small as described above, the leak occurs between the side seal abutment portion 16 and the cap liner 11 while the entanglement portion 12 does not reach breakage, and then even if the lid is closed again. There is a risk of being sold as a product with no evidence left. That is, when the opening part 2 falls to the inner surface side, there exists a problem that the said irregular opening display function by breaking of the entanglement part 12 may not work.

In order to solve the above problem, as shown in FIG. 6, it is proposed to form columnar protrusions 20 protruding outward from the outer surface side of the side seal abutment portion 16 at the upper edge of the opening 2. have. As for the columnar protrusion part 20, the upper edge is on the extension line of the top board contact part 15, and the chamfer is given in the corner part of this upper edge and the outer peripheral surface.

When the columnar protrusion 20 is provided, the columnar protrusion 20 may be in contact with the cap liner 11 even when the opening 2 is deformed to fall to the inner surface side by the tightening torque. Therefore, it is thought that the sealing property of the opening part 2 and the plastic cap 6 can be maintained until the entanglement part 12 fractures by the contact of the columnar protrusion part 20 and the cap liner 11.

However, if the columnar protrusion 20 of the above shape is provided, the cap liner 11 is damaged when the plastic cap 6 is fastened to the opening 2 at high speed, so that the opening 2 and the plastic cap 6 are damaged. There exists a problem that the sealing property with may become inadequate.

Moreover, since the cap liner 11 is generally formed of polyolefin, such as polyethylene, when the columnar protrusion 20 is exposed to the high temperature environment of the said hot filling, the part where the columnar protrusion 20 was pressurized There is also a problem that plastic deformation causes insufficient sealing property between the opening 2 and the plastic cap 6.

It is an object of the present invention to solve such a problem and to provide a synthetic resin bottle which can obtain excellent sealing property between the opening and the plastic cap.

In order to achieve this object, the present invention provides an opening in which an external thread is formed on the outer surface side to be thermally crystallized, a disk-shaped top plate, which extends along the side surface of the opening from the outer peripheral edge of the top plate, and the opening on the inner surface side. A cylindrical portion having a female threaded portion screwed to the male screw portion of the top plate, an annular side seal portion protruding from the inner peripheral side of the cylindrical portion of the top plate toward the opening portion, a cap liner provided on the inner surface of the top plate and the side seal portion; And a skirt portion connected to the lower portion of the cylindrical portion through an entanglement portion, and having a plastic cap screwed to the opening portion to close the lid, the opening portion being positioned at the opening end of the opening portion and through this cap liner. The top plate abutment portion which abuts against the top plate and the outer surface side of the top plate abutment portion are provided in succession to move the yarn through this cap liner. In a bottle made of a synthetic resin having a side seal abutment portion which abuts against the seal portion, the side seal abutment portion is provided with the top plate abutment portion through a curved portion having an arcuate cross-sectional contour having a radius in the range of 0.4 to 0.8 mm. It is connected continuously and has an annular protrusion which has a substantially semi-circular cross-sectional outline which protruded on the outer surface side, When this plastic cap is screw-attached to this opening part, this annular protrusion is more than the end part of this side seal part. The cap liner is pressed against the cap liner at the top plate side, and the cap liner is attached to the end portion of the side seal portion rather than the portion to which the annular protrusion is pressed. It is not pressurized by the press, but when the cap of the plastic cap is opened, it is pressed by the annular protrusion to break the entanglement. To characterized in that it comprises the pressureless part of maintaining the sealing of the openings and with the plastic cap.

Since the synthetic resin bottle of the present invention includes the annular protrusion, the annular protrusion may be deformed so as to cause deformation of the opening to fall to the inner surface side when the plastic cap is attached to the opening after the hot charging of the contents. The protrusion is pressed against the cap liner. Therefore, the sealing property of the said opening part and a plastic cap can be ensured.

At this time, the annular projection is connected to the top plate abutment portion successively through a curved portion having a circular cross-sectional contour having a radius in the range of 0.4 to 0.8 mm. Accordingly, when the plastic cap is attached by screwing, there is a gap between the curved portion and the cap liner, thereby preventing damage to the cap liner due to contact with the opening.

Moreover, the said annular protrusion part is press-contacted with the said cap liner in the part between the edge part of this side seal part, and the said top plate with respect to the said side seal part. Therefore, the cap liner which is not pressurized is left between the edge part of the said side seal part, and the part which the said annular protrusion part press-contacts. As a result, even if the said cap liner of the part which the said annular protrusion part press-contacts plastic deformation by hot charging of the said content, the said non-pressurized cap liner becomes hard to produce the said plastic deformation. Therefore, when opening a stopper, the cap liner of the part which does not receive the said pressurization and becomes hard to produce the said plastic deformation can contact with the said annular protrusion, can maintain sealing property, and a sufficiently large leak angle can be obtained.

In the annular projection, when the radius of the arcuate cross-sectional contour of the curved portion is less than 0.4 mm, a sufficient gap cannot be formed between the curved portion and the cap liner, and the cap liner contacts and damages this curved portion. It is easy to receive. Further, when the radius of the arc-shaped cross-sectional contour exceeds 0.8 mm, the position of the annular protrusion approaches the end of the side seal portion, whereby the cap liner is hardly caused to cause the plastic deformation without the pressing. We cannot install enough.

As for the said structure, the synthetic resin bottle of this invention has the inner diameter of the said opening part in the range of 20-40 mm, the thickness of this opening part is the range of 2-5 mm, and the length of the said side seal part is 1.0-1.2. It is especially preferable when it exists in the range of mm.

Moreover, the said annular protrusion is protruded in the range of 0.03-0.2 mm on one side toward the outer side from the outer surface of the said side seal contact part, It is characterized by the above-mentioned. When the protruding amount of the annular protrusion is less than 0.03 mm on one side, when the opening is deformed to fall to the inner surface side, the annular protrusion is not sufficiently pressed against the cap liner, and the sealing property between the opening and the plastic cap is prevented. It may be insufficient. Moreover, when the protrusion amount of the said annular protrusion exceeds 0.2 mm on one side, this annular protrusion will be strongly pressed against the said cap liner, and it will become difficult to rotate the said plastic cap at the time of opening a stopper.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory sectional drawing which shows the structure of the principal part of the synthetic resin bottle which concerns on this invention.

FIG. 2 is an explanatory cross-sectional view showing an enlarged main part of FIG. 1. FIG.

3 is an explanatory cross-sectional view showing an enlarged main part of FIG. 1.

It is explanatory sectional drawing which expands and shows the state which screwed a plastic cap on the synthetic resin bottle which concerns on this invention.

It is explanatory sectional drawing which expands and shows the state which screwed the plastic cap on the synthetic resin bottle which concerns on this invention.

6 is an explanatory cross-sectional view showing an enlarged main part of a conventional synthetic resin bottle.

EMBODIMENT OF THE INVENTION Next, embodiment of this invention is described in detail, referring an accompanying drawing.

The synthetic resin bottle 1 of this embodiment shown in FIG. 1 is formed by biaxial stretching blow molding a preform made of polyethylene terephthalate, and has an opening 2 which is whitened by a thermal crystallization treatment. The synthetic resin bottle 1 of the present embodiment has a so-called PCO opening cylinder portion, and the male screw portion 3 is formed on the outer surface side of the opening 2, and the upper and lower widths of the male screw portion 3 are reduced. The bead ring 4 and the support ring 5 are formed.

The synthetic resin bottle 1 can be used as a container for juice drinks, coffee, oolong tea, Japanese tea, or the like, and the opening 2 has an inner diameter of 20 to 40 mm and a thickness of 2 to 5 mm. In the synthetic resin bottle 1, after the contents are hot-charged at a temperature of about 90 ° C, the plastic cap 6 is screwed to the opening 2 which is whitened by the thermocrystallization treatment, and the lid is closed.

The plastic cap 6 has a disk-shaped top plate 7 and a cylindrical portion 8 extending downward from the outer circumferential edge of the top plate 7, and the number of openings 2 is provided on the inner surface side of the cylindrical portion 8. A female screw portion 9 for screwing into the screw portion 3 is formed. The top plate 7 is formed with an annular side seal portion 10 protruding downward from the position on the inner circumferential side of the cylindrical portion 8 in the range of 1.0 to 1.2 mm.

In addition, the plastic cap 6 includes a skirt portion 13 connected to the lower portion of the cylindrical portion 8 via the entanglement portion 12, and a fin-shaped engaging portion 14 is provided on the inner circumferential side of the skirt portion 13. ) Is installed.

As shown in FIG. 2, the plastic cap 6 is provided with a cap liner 11 made of polyolefin such as polyethylene on the inner surface of the top plate 7 and the side seal portion 10. Thus, when the plastic cap 6 is threadedly attached to the opening 2, the opening 2 is provided with the top plate abutment 15 abutting against the top plate 7 via the cap liner 11, while the side seal is fitted. The contact portion 16 abuts the side seal portion 10 through the cap liner 11.

At this time, the plastic cap 6 is prevented from being pulled out by engaging the engaging portion 14 with the bead ring 4 of the opening 2. Therefore, the synthetic resin bottle 1 cannot be opened unless the plastic cap 6 is rotated to break the entangled portion 12, and thus, the trace of the open end of the entangled portion 12 is left. It has a unwinding display function.

Moreover, in the synthetic resin bottle 1 of this embodiment, the annular protrusion 17 is provided in the side seal | sticker contact part 16 of the opening part 2, as shown to the enlarged view in FIG. The annular protrusion 17 has a substantially semi-circular cross-sectional contour and is in contact with the top plate abutting portion 15 via a curved portion 18 having an arc-shaped cross-sectional contour.

Here, the curved surface portion 18 has a radius r of the arc-shaped cross-sectional contour in the range of 0.4 to 0.8 mm, and at one end, the top plate abutting portion 15 is formed of the arc-shaped cross-sectional contour. It becomes a tangential line, and the other end is connected to the top part of the annular protrusion 17 smoothly. Therefore, the top part of the annular protrusion part 17 is formed below the top plate contact part 15 and in the range of 0.4-0.8 mm. In addition, the annular protrusion 17 is formed to protrude from the outer surface of the side seal abutting portion 16 at a protrusion amount t in the range of 0.03 to 0.2 mm.

In the synthetic resin bottle 1 having the above-described configuration, when the plastic cap 6 is screw-attached at high speed following the hot charging of the contents, as shown by a virtual line in FIG. The deformation | transformation which the front-end | tip of the heated part 2 heated by this falls down to the inner surface side by the fastening device attachment torque at the time of the said screw attachment occurs. The deformation is that in the case of the opening portion 2 in the range of 20 to 40 mm in inner diameter and 2 to 5 mm in thickness, 0.1 to 0.2 mm falls into the inner surface side with respect to the outer diameter. It becomes smaller diameter and becomes a thin tip.

At this time, the annular protrusion 17 protrudes from the outer surface of the side seal abutting part 16 in the range of 0.03-0.2 mm as mentioned above. Therefore, even if the opening part 2 deform | transforms into the said thin shape, as shown in FIG. 4, the annular protrusion 17 press-contacts the cap liner 11 provided in the inner surface of the side seal part 10 of the plastic cap 6 And the sealing property of the opening part 2 and the plastic cap 6 can be maintained. In addition, since the curved portion 18 is formed in the opening portion 2, there is a gap 19 between the cap liner 11 and the curved portion 18 at the time of the screw attachment, and the cap liner 11 is damaged. You can prevent receiving.

The side seal portion 10 of the plastic cap 6 has a length of 1.0 to 1.2 mm as described above, and the annular protrusion 17 has a top portion in the range of 0.4 to 0.8 mm below the top plate contact portion 15. Have Therefore, the annular protrusion 17 is press-contacted to the cap liner 11 between the end of the side seal portion 10 and the top plate 7, and is not pressed below the portion to which the annular protrusion 17 is press-contacted. This is left.

Since the cap liner 11 is formed of polyolefin such as polyethylene, when the annular protrusion 17 is exposed to the high temperature environment of the hot charging in the pressurized state, the portion where the annular protrusion 17 is pressed causes plastic deformation. The sealing property between the opening 2 and the plastic cap 6 is insufficient. However, in the present embodiment, when the plastic cap 6 moves upward when the stopper is opened, as shown in FIG. 5, when the stopper is closed, the pressurization left below the portion where the annular protrusion 17 is pressed is pressed. The part 11a which is not being made becomes new and press-contacted to the annular protrusion 17, and the sealing property of the opening part 2 and the plastic cap 6 is maintained by this.

As a result, in the synthetic resin bottle 1 of the present embodiment, a sufficiently large leak angle can be obtained, and the sealing property between the opening portion 2 and the plastic cap 6 until the entangled portion 12 is broken. You can keep it.

Next, the synthetic resin bottle whose protruding amount t of the annular protrusion 17 is 0.03 mm or 0.07 mm, and the radius r of the circular-shaped cross-sectional contour of the curved part 18 is 0.50 mm or 0.70 mm ( 1) (Examples 1 to 4), when the plastic cap 6 is screwed to the opening portion 2 after the above hot charging, the leak angle at the time of opening the stopper is measured, and the annular protrusion 17 and It compared with the case where the curved part 18 is not formed at all (comparative example). The said leak angle is an average value of the values measured about 30 synthetic resin bottles 1, respectively. The results are shown in Table 1.

Protrusion amount t (mm) Radius r (mm) Leak Angle (°) Example 1 0.03 0.5 170 Example 2 0.03 0.7 155 Example 3 0.07 0.5 200 Example 4 0.07 0.7 190 Comparative example --- --- 80

From Table 1, in the synthetic resin bottle 1 of Examples 1-4, the leak angle is 155-200 degrees, and the opening part 2 and the plastic cap 6 are sealed until the entanglement part 12 fractures. It was found that a sufficiently large leak angle can be obtained at 100 ° or more, which is preferable in order to maintain the properties. On the other hand, in the synthetic resin bottle of the comparative example, the leak angle was 80 degrees and it turned out that there exists a possibility that a leak may arise before the entanglement part 12 reaches a break.

In addition, although the synthetic resin bottle 1 provided with a PCO opening cylinder part is demonstrated in this embodiment, this invention is applicable also to the synthetic resin bottle 1 which is not equipped with a PCO opening cylinder part.

The synthetic resin container of the present invention is provided with an unsealed display function and can be used as a container filled with beverages such as juice drinks, coffee, oolong tea, and Japanese tea.

Claims (5)

An opening portion in which a male screw part is formed on the outer surface side and is thermally crystallized, A cylindrical portion provided with a disk-shaped top plate, a female screw portion extending from the outer peripheral edge of the top plate to the side of the opening and screwed to the male screw portion of the opening on the inner surface side, and from the inner circumferential side of the cylindrical portion of the top plate; An annular side seal portion protruding in the opening direction, a cap liner provided on the inner surface of the top plate and the side seal portion, and a skirt portion connected to the lower portion of the cylindrical portion through an entanglement portion, the lid being screwed to the opening portion. Equipped with a plastic cap to close the The opening is located at the open end of the opening and is in contact with the top plate via the cap liner and the side seal abutment provided on the outer surface side of the top plate abutment to contact the side seal through the cap liner. In the bottle made of synthetic resin having a contact portion, The side seal abutment portion is connected to the top plate abutment portion successively through a curved portion having an arc-shaped cross-sectional contour having a radius in the range of 0.4 to 0.8 mm, and has a substantially semi-circular cross-sectional contour protruding to the outer surface side. With an annular protrusion, This annular projection is press-contacted to this cap liner at this top plate side rather than the end side part of this side seal part when this plastic cap is screwed to this opening part, The cap liner is not pressed by the annular projection when the plastic cap is screwed to the opening portion rather than the portion where the annular projection is press-contacted, and then the cap of the plastic cap is closed. And a non-pressurized portion for holding the seal between the opening and the plastic cap until the entangled portion breaks when opened. The inner diameter of the opening is in the range of 20 to 40 mm, the thickness of the opening is in the range of 2 to 5 mm, and the length of the side seal is in the range of 1.0 to 1.2 mm. Plastic bottle. The synthetic resin bottle according to claim 1, wherein the annular projection is formed so as to protrude outward from an outer surface of the side seal abutment portion in a range of 0.03 to 0.2 mm on one side. The synthetic resin bottle according to claim 1, wherein the preform made of polyethylene terephthalate is formed by biaxial stretching blow molding. The synthetic resin bottle according to claim 1, wherein the contents are hot filled.

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