WO2017043200A1

WO2017043200A1 - Synthetic resin cap

Info

Publication number: WO2017043200A1
Application number: PCT/JP2016/071793
Authority: WO
Inventors: 伸生川村; 淳史小野; 慎吾梅木
Original assignee: 日本山村硝子株式会社
Priority date: 2015-09-11
Filing date: 2016-07-26
Publication date: 2017-03-16
Also published as: JPWO2017043200A1; JP6937542B2

Abstract

[Problem] To provide a synthetic resin cap which is lightweight and which is configured so that the force of engagement with an annular protrusion on a container mouth can be maintained sufficiently. [Solution] A cap 1 comprises: a skirt wall provided with a female thread engaging with a male thread formed on the outer periphery of a container mouth; and a tamper-evident band connected to the lower part of the skirt wall through an annular frangible section. A plurality of engagement sections 11 capable of engaging from below with an annular protrusion provided on the outer periphery of the container mouth are provided at a circumferential distance from each other on the inner peripheral side of the tamper-evident band 9. Thick-walled sections 12 are provided at edges of the engagement sections 11.

Description

Plastic cap

The present invention relates to a synthetic resin cap that is attached to the mouth of a container that contains contents such as beverages.

As a cap attached to the mouth of a container for storing contents such as beverages, a cap that can be confirmed at a glance whether or not it is opened is widely used. As such a cap, a cap body having a skirt wall provided with a female screw to be engaged with a male screw of a container mouth portion, and a tamper evidence band connected to a lower portion of the skirt wall via an annular weakening portion It has been known.

In the above-described conventional cap, a locking piece (flap) provided on the inner periphery of the tamper evidence band is provided on the outer periphery of the container mouth portion in accordance with the opening operation (rotation operation) from the state of being attached to the container mouth portion. After locking to the annular protrusion (locking jaw), the bridge (bridge) connecting the tamper evidence band and the skirt wall is broken, and the cap body and the tamper evidence band are separated from each other (Patent Document 1). reference). Therefore, it is possible to easily confirm whether or not the opening operation has been performed by visually checking whether or not the bridge is broken.

JP 2010-195455 A

By the way, in the conventional lightweight cap, the weight is reduced by thinning the skirt wall. In order to further reduce the weight, the present inventors have attempted to reduce the thickness of the locking piece, but due to the thinner locking piece, the locking force on the annular projection of the container mouth is insufficient. There is a fear.

The present invention has been made in consideration of the above-mentioned matters, and an object of the present invention is to provide a synthetic resin cap capable of sufficiently maintaining the locking force to the annular projection of the container mouth while reducing the weight. There is.

In order to achieve the above object, a synthetic resin cap according to the present invention includes a skirt wall provided with a female screw that is screwed into a male screw formed on the outer periphery of a container mouth portion, and an annular weakening portion at a lower portion of the skirt wall. A tamper-evidence band connected to the inner periphery of the tamper-evidence band, and a locking piece that can be locked from below on an annular protrusion provided on the outer periphery of the container mouth. A plurality are provided at intervals in the direction, and a thick portion is provided at the edge of the locking piece.

In the synthetic resin cap, the thick portion may be provided across the edge on the tip side and the left and right edges of the locking piece (claim 2).

In the synthetic resin cap, the thick portions provided at the left and right edges of the locking piece may be thinner toward the base end side of the locking piece (Claim 3).

In the synthetic resin cap, a recessed portion that is surrounded by the thick portion from three sides and recessed upward may be provided at the center of the lower surface of the locking piece.

In the present invention, it is possible to obtain a synthetic resin cap capable of sufficiently maintaining the locking force to the annular projection of the container mouth while reducing the weight.

That is, in the synthetic resin cap of the invention according to each claim of the present application, a thick part is provided at the edge of the locking piece, and the rib effect based on the thick part is used to improve the strength of the locking piece. As a whole, it is possible to reduce the weight of the locking piece, and hence the cap.

In the synthetic resin cap of the invention according to claim 3, it becomes easy to give a moderate flexibility to the base end portion of the locking piece, and when the locking piece is pushed up by the annular projection during capping and reversed, The base end portion of the locking piece can be made difficult to break.

In the synthetic resin cap of the invention according to claim 4, when the locking piece is pushed up by the annular protrusion during capping, the annular protrusion does not abut against the thin recessed portion, and the thick portion having relatively high strength Therefore, it is difficult to cause a problem that the annular protrusion collides with the thin recessed portion and the locking piece is damaged.

It is a bottom view showing roughly the composition of the synthetic resin cap concerning one embodiment of the present invention. FIG. 2 is a sectional view taken along line AA in FIG. 1. (A) is a cross-sectional view taken along the line BB of FIG. 1, and (B) is a cross-sectional view taken along the line CC of FIG.

Embodiments of the present invention will be described below with reference to the drawings.

A synthetic resin cap (hereinafter referred to as a cap) 1 shown in FIGS. 1, 2, 3A and 3B is attached to a mouth M (see FIG. 3A) of a container such as a PET bottle. And is integrally molded with polyethylene by compression molding or injection molding. In addition, the raw material which forms the cap 1 is not specifically limited, Polypropylene etc. other than the polyethylene used by this embodiment are used suitably.

As shown in FIGS. 1 and 2, the cap 1 has a substantially circular top wall 2 in a plan view, and a substantially cylindrical skirt wall 3 extending downward from the outer peripheral portion of the top wall 2. Yes. Here, a knurled groove 4 is provided on the outer peripheral surface of the skirt wall 3, and a female screw 5 is provided on the inner peripheral surface. The female screw 5 is a male screw M1 formed on the outer periphery of the container mouth (see FIG. 3A). ).

Then, when the cap 1 is rotated so that the female screw 5 of the skirt wall 3 is coupled to the male screw M1 of the container mouth part M and attached to the container mouth part M, the annular shape connected to the inner surface (lower surface) of the top wall 2 is provided. The middle leg (inner ring) 6, the annular rib 7 and the annular outer leg (outer ring) 8 are in close contact with the container mouth M, whereby the container mouth M is sealed (FIG. 3A). reference). That is, as indicated by a virtual line in FIG. 3A, in the state where the cap 1 is attached to the container mouth portion M, the middle leg 6 is inserted into the container mouth portion M and the inner peripheral surface of the container mouth portion M is inserted. The annular rib 7 is configured to be in close contact with the annular upper end surface of the container mouth portion M, and the outer leg 8 is configured to be in close contact with the outer peripheral surface of the container mouth portion M.

The cap 1 is a pilfer-proof cap having a function of proving that it has not been opened (that has never been opened). When the unopened cap 1 attached to the container mouth M is opened (first time) When the cap 1 is rotated so that the coupling between the male screw M1 and the female screw 5 is released, the cap 1 is detached from the container mouth M, but the tamper evidence connected to the lower part of the skirt wall 3 A band (hereinafter simply referred to as “band”) 9 is configured to remain in the container mouth M.

That is, the band 9 is connected to the lower part of the skirt wall 3 via an annular weakened portion 10 extending over the entire circumference of the skirt wall 3 (see FIG. 3). The annular weakened portion 10 is connected to the skirt wall 3 and the band 9. A plurality of bridges 10a existing on the inner peripheral side of the boundary between the skirt wall 3 and the slits 10b extending in the circumferential direction of the skirt wall 3 and the band 9 so as to vertically define the skirt wall 3 and the band 9, and the bridge 10a A part (outer peripheral part) of the bridge 10a is also cut by the slit 10b so that it is broken when pulled by a predetermined force.

In addition, a plurality of locking pieces (flaps) 11 protruding inward are provided on the inner peripheral side of the band 9 (eight in this example) at intervals in the circumferential direction (see FIGS. 1 to 3). ). Each locking piece 11 is positioned substantially below an annular protrusion (bead portion) M2 formed below the male screw M1 on the outer periphery of the container mouth M in a state where the cap 1 is mounted on the container mouth M. Then, it is locked to the annular projection M2 by an opening operation (see FIG. 3A). That is, the locking piece 11 is configured to be able to be locked to the annular protrusion M2 from below, and the cap main body portion (the skirt wall 3 and the top wall 2) above the annular weakening portion 10 when opened is the container mouth portion. The band 9 which is separated from M and below the annular weakened portion 10 remains in the container mouth M, and the annular weakened portion 10 is broken accordingly.

Here, the band 9 is integrally formed with the cap body (the skirt wall 3 and the top wall 2), and the locking piece 11 provided on the band 9 protrudes downward as shown in FIG. However, when the cap 1 is attached to the container mouth M, the cap 1 is pushed up by the annular projection M2 to be inverted, and protrudes upward as indicated by a virtual line in FIG.

And in this embodiment, as shown to FIG. 1, FIG. 3 (A) and (B), the thick part 12 is provided in the edge of the latching piece 11, and the rib effect based on this thick part 12 is, While the strength of the locking piece 11 is improved, the weight of the locking piece 11 as a whole and the weight of the cap 1 can be reduced as a whole.

Specifically, as shown in FIG. 1, the thick portion 12 is provided across the edge on the front end side of the locking piece 11 and the edges on both the left and right sides. And the thick part 12 provided in the edge part of the right-and-left both sides of the locking piece 11 is comprised so that it may become thin gradually toward the base end side of the locking piece 11, as shown to FIG. 3 (A). It is. Accordingly, the base end portion of the locking piece 11 can be provided with appropriate flexibility, and when the locking piece 11 is pushed up by the annular projection M2 and reversed when capping, the base end portion of the locking piece 11 Is difficult to break.

Further, in the present embodiment, as shown in FIGS. 1 to 3, the upper surface of the locking piece 11 is substantially flush, and is surrounded by the thick portion 12 from the three sides at the center of the lower surface of the locking piece 11 and on the upper side. Since the recessed portion 13 to be recessed is formed, when the locking piece 11 is pushed up by the annular protrusion M2 and reversed when capping, the annular protrusion M2 does not come into contact with the thin recessed portion 13. Since it comes into contact with the thick portion 12 having a relatively high strength, it is difficult to cause a problem that the annular protrusion M2 collides with the thin recessed portion 13 and the locking piece 12 is broken.

Furthermore, in this embodiment, as shown in FIG. 1, the blurring surface part which is gradually thickened and widened toward the thick part 12 provided in the edge part of the right and left both sides is provided in the both ends of the recessed part 13. As shown in FIG. Therefore, when the locking piece 11 is contacted by the annular protrusion M2, it is difficult for stress to concentrate on both ends of the recessed portion 13, thereby preventing the locking piece 11 from being damaged.

Here, when the locking piece 11 that protrudes upward at the time of opening largely falls down, the locking piece 11 is easily reversed by receiving contact with the annular protrusion M2 and protrudes downward. The piece 11 does not lock well with the annular protrusion M2. However, in the present embodiment, since the thick portion 12 provided on the distal end side of the locking piece 11 is configured to bulge to the lower surface side, the locking piece 11 that protrudes upwardly falls greatly. This (falling down) is prevented by the abutment of the thick portion 12 against the outer peripheral surface of the container mouth portion M (the portion M3 located immediately below the annular projection M2), whereby the locking piece 11 against the annular projection M2 is prevented. The locking is performed well.

It should be noted that the present invention is not limited to the above-described embodiment, and can be variously modified and implemented without departing from the gist of the present invention. For example, the following modifications can be given.

In the above-described embodiment, the blurring surface portions 14 are provided at both ends of the recessed portion 13, and the portion of the recessed portion 13 that is in contact with the thick portion 12 on the distal end side of the locking piece 11 is gradually moved toward the thick portion 12. The thickened blur surface portion 15 (see FIG. 1) is provided, but such a blur surface portion may also be provided in other parts.

In the above-described embodiment, the upper surface of the locking piece 11 is substantially flush, and the recessed portion 13 is formed in the center of the lower surface of the locking piece 11 by being surrounded by the thick portion 12 from three sides and recessed upward. However, the present invention is not limited to this. For example, the bottom surface of the locking piece 11 is substantially flush, and the recessed portion 13 is recessed in the upper side by being surrounded by the thick portion 12 at the center of the top surface of the locking piece 11 from three sides. May be formed.

In the above embodiment, the thick portions 12 are provided on all the locking pieces 11, but the thick portions 12 may be provided only on some of the locking pieces 11. It is also possible that the locking pieces 11 provided with the meat portion 12 and the locking pieces 11 not provided are alternately arranged in the circumferential direction of the band 9.

In the above embodiment, each locking piece 11 is made independent, but for example, the tips of adjacent locking pieces 11 may be connected to each other, and all the locking pieces 11 may be connected in a ring shape.

Needless to say, the modifications described in this specification may be combined as appropriate.

DESCRIPTION OF SYMBOLS 1 Cap 2 Top wall 3 Skirt wall 4 Knurled groove 5 Female thread 6 Middle foot 7 Annular rib 8 Outer foot 9 Tamper evidence band 10 Annular weakened part 10a Bridge 10b Slit 11 Locking piece 12 Thick part 13 Indented part 14 Blurred surface part 15 Blur Face part M Container mouth part M1 Male thread M2 Annular protrusion M3 A part directly below the annular protrusion

Claims

A cap comprising: a skirt wall provided with a female screw that engages with a male screw formed on the outer periphery of the container mouth portion; and a tamper evidence band connected to a lower portion of the skirt wall via an annular weakening portion,
A plurality of locking pieces that can be locked from below on an annular protrusion provided on the outer periphery of the container mouth portion are provided on the inner peripheral side of the tamper evidence band at intervals in the circumferential direction.
A synthetic resin cap characterized in that a thick portion is provided at an edge of the locking piece.
2. The synthetic resin cap according to claim 1, wherein the thick-walled portion is provided across the edge portion on the front end side and the left and right edge portions of the locking piece.
3. The synthetic resin cap according to claim 2, wherein the thick portions provided at the left and right edges of the locking piece become thinner toward the base end side of the locking piece.
The synthetic resin cap according to any one of claims 1 to 3, wherein a recessed portion that is surrounded from three sides by the thick-walled portion and recessed into the upper side is provided at a central portion of the lower surface of the locking piece.