KR20020009857A - Plastic container closure - Google Patents

Abstract

PURPOSE: A synthetic resin container cover is provided to form a cutting member of the container cap as an annular thin wall portion, and to secure a sufficient length of a knob piece while constructing a female mold defining the outer contour of a skirt portion as two split mold members. CONSTITUTION: The synthetic resin container cover(2) comprises a top surface wall(4), a skirt wall(6), and a knob piece(8). The skirt wall is formed with an annular cutting member(12) extending along the circumference thereof and sectionalizing the skirt wall into an upper main portion and a temper evident lower portion(16). The knob piece consists of a base end portion(34) connected to the outer periphery of the temper evident lower portion, a raising portion(36) extending upwardly exceeding the annular cutting member, and an arch shaped portion(38) extending in an arch form along the outer periphery of the main portion over the annular cutting member.

Description

Plastic Resin Container Cover {PLASTIC CONTAINER CLOSURE}

The present invention is a synthetic resin container cover having a tamper evident property, more specifically, integrally molded from a synthetic resin, but is not limited thereto, and particularly has a tamper aviation property which is preferably applied to glass milk bottles. It relates to a container cover made of synthetic resin.

Japanese Patent Laid-Open No. 2743160 and Japanese Patent Laid-Open No. 9-30552 disclose a synthetic resin container cover integrally molded from a suitable synthetic resin such as polyethylene, which is particularly preferably applied to glass milk bottles. Such a container cover is provided with a circular top wall, a cylindrical skirt wall extending downward from the periphery of the top wall, and a knobpiece. An annular breaking means extending in the circumferential direction is formed in the skirt wall, and the skirt wall is divided into a main portion that is higher than the annular breaking means and a tamper evidence bottom that is lower than the annular breaking means. Engagement means, which is a protrusion projecting radially inward, is formed on the inner circumferential surface of the skirt wall, and engagement means, which is a projecting portion, which projects radially inward, is also formed on the inner circumferential surface of the bottom of the tamper evidence. The handle piece extends almost circumferentially at a proximal end connected to the outer circumferential surface of the tamper evidence bottom. The bottom of the tamper incident is also provided with longitudinal breaking means extending from the upper end to the lower end of the tamper evidence bottom near the proximal end of the handle piece.

The container cover as described above is applied to a container, for example, a glass milk bottle, in which an upper engaging means, which is an annular recess, is formed on the outer circumferential surface of the aperture, and a lower engaging means, which is an annular recess, is similarly formed. . In the case where the container cover is attached to the bore of the container to seal the bore, the container cover is covered with the bore to press down, and the engagement means formed on the inner surface of the main part of the skirt wall is engaged with the top engagement means of the bore. The engagement means formed at the bottom of the tamper evidence is engaged with the lower engagement means of the aperture. In the case of opening the caliber of the container, the longitudinal breaking means of the tamper evidence bottom is broken by grasping and pulling the handle of the container cover, and then the annular breaking means of the skirt wall is broken, and thus the tamper evidence bottom is skirted. Separate from the main part of the and at the same time detach from the aperture. After that, the remainder of the container cover, that is, the main part of the top wall and the skirt wall, is separated from the aperture.

In the container cover disclosed in Japanese Patent No. 2743160, the annular breaking means is formed by disposing an annular groove on the outer circumferential surface of the skirt wall to create an annular thin wall portion. When the annular groove is provided on the outer circumferential surface of the skirt wall as described above, the female mold defining the outline of the lower portion of the at least the annular groove of the skirt wall is radial in that it is a mold release when forming the container cover. It is necessary to consist of two split-mold members which can be moved outwardly and spaced apart from the container lid. In the case of using such a split member, the handle piece has a form in which the base end spans the mutual contact line of the split member in that it is a mold release, so that a part of the base part is defined by one split member. And the remainder of the proximal end is defined by the other divided member, and the main part of the handle piece needs to be defined by the other of the split-mold. Therefore, the main portion of the handle piece needs to extend in parallel to the horizontal direction of the divided type, and extends in a straight line parallel to the tangent of the outer circumferential surface of the tamper evidence bottom, not the arcuate shape along the outer circumferential surface of the tamper evidence bottom. It is necessary. In the case where the main portion of the handle piece is extended in such a straight line, when the length of the main piece of the handle piece becomes longer, a considerable space is created between the tip of the handle piece and the outer circumferential surface of the bottom of the tamper. And due to the existence of such space, the following problems occur. That is, when a large number of container covers are put into the hopper in a mounting process for attaching the container cover to the aperture portion of the container, the other container is placed in a considerably large space existing between the handle piece of the container cover and the outer peripheral surface of the tamper-avior bottom. The handle piece of the cover enters, which causes the container cover and the container cover to interlock with each other, causing so-called blocking. In order to avoid such a problem, it is necessary to shorten the extension length of the handle piece, but if the extension length of the handle piece is shortened, it becomes difficult to hold the handle piece, so that the breaking of the longitudinal breaking means and the annular breaking means becomes quite difficult.

On the other hand, in the container cover disclosed in Japanese Patent Laid-Open No. 9-30552, the annular breaking means is formed by disposing an annular groove on the inner circumferential surface instead of the outer circumferential surface of the skirt wall to create an annular thin wall portion. When the annular groove is disposed on the inner surface of the skirt wall in this manner, when a male mold defining the inner circumferential surface of the skirt wall is formed of a so-called divided member, the configuration of the male mold itself and its moving process are very high. Because of the complexity, a split-mold structure is not usually employed in a male mold, and so-called forced mold release is applied to an annular groove disposed on an inner circumferential surface of a skirt wall. . In order to apply such a forced mold release, it is necessary to limit the depth of the annular groove to a small value. Therefore, in order to make the wall thickness of the thin wall portion small enough, the wall thickness of the bottom of the tamper-evidence should be considerably thinned. There is a need. If the wall thickness of the bottom of the tamper evidence is made very thin, the following problems arise. In other words, since one edge of the annular groove is defined by the upper edge of the bottom of the tamper avid, the formability of the annular groove is reduced. In other words, it is difficult to stably form the required annular groove. In addition, if the support member is brought into contact with the bottom edge of the bottom of the tamper-avior and the force is applied to the container cover, the thin tamper-avid bottom becomes excessively deformed. Therefore, if the male mold is forcibly removed from the molded container cover, Although it is necessary to apply a force to the inner surface of the upper surface wall of the upper surface wall, it tends to deform into a shape that the upper surface wall protrudes outwardly.

The main object of the present invention is to form the annular breaking means of the skirt wall by disposing an annular groove on the outer circumferential surface of the skirt wall to create an annular thin-wall portion (hereinafter referred to as an annular thin wall portion). Thus, two so-called split-mold members which can be spaced apart from the container lid by linearly moving the female mold defining the outline of the lower part in at least the annular groove of the skirt wall radially outward. Although it is necessary to configure the length of the handle piece, it is possible to lengthen the extension length of the handle piece sufficiently, so that the problem existing in the container lid disclosed in Japanese Patent Application Laid-open No. Hei 9-30552 can be avoided. It is to provide a new and improved container cover that can also avoid the problems present in the container cover disclosed in Patent No. 2743160.

1 is a perspective view showing a preferred embodiment of a container cover constructed according to the present invention.

2 is a front view of the container cover shown in FIG.

3 is a bottom view of the container cover shown in FIG.

4 is a cross-sectional view taken along the line IV-IV of FIG. 3.

FIG. 5 is a front view showing a part of the state in which the container cover shown in FIG. 1 is attached to a bore of a glass milk bottle, and a part of which is shown in sectional view. FIG.

[Explanation of symbols on the main parts of the drawings]

2: container cover 4: circular top wall

6: cylindrical skirt wall 8: handle

10: cylindrical sealing piece 12: annular breaking means

14 housewife 16: tamper avid bottom

18: fantasy groove 20: fantasy flange

21: collar 22: protrusion

24: engaging means 26: arc-shaped protrusion

28: engaging means 30: missing part

32: protrusion 34: proximal end

36: rising part 38: arc upper part

40: connecting piece 42: longitudinal breaking means

44: slit 46: groove

48: missing plane 50: missing plane

52: mold member 54: divided mold member

56: aperture 58: upper expansion portion

60: lower inflation portion 62: annular recess

64: illusionist

According to the present invention, in order to achieve the above object, an annular break means is formed by disposing an annular groove on the outer circumferential surface of the skirt wall to form an annular thin wall portion, and at the same time, the handle piece is connected to the outer circumferential surface of the bottom of the tamper. A proximal end portion, a raised portion extending upwardly beyond the annular breaking means at the proximal end, and an arcuate upper portion extending along the outer circumferential surface of the main portion of the skirt wall at the raised portion and extending arcuately above the annular breaking means. Doing.

That is, according to the present invention, there is provided a container cover made of synthetic resin for achieving the above object, comprising an upper surface wall integrally formed of synthetic resin, a cylindrical skirt wall extending downward from the periphery of the upper surface wall, and a handle piece, The skirt wall is provided with annular breaking means extending in the circumferential direction, and the skirt wall is partitioned into a main portion higher than the annular breaking means and a tamper evidence bottom portion lower than the annular breaking means. Engaging means is formed on the inner circumferential surface of the main portion of the main portion, and the annular breaking means is formed by disposing an annular groove on the outer circumferential surface of the skirt wall to create an annular thin wall portion, and the handle piece is the tamper-avid bottom portion. A proximal end connected to an outer circumferential surface of the upper end of the proximal end of the proximal end of the proximal end; And a circular arc top portion extending upwardly in an arc shape from the annular rupture means along the outer circumferential surface of the skirt wall.

It is preferable that the inner surface of the said arcuate part of the said handle piece is connected to the outer peripheral surface of the said main part of the said skirt wall through the breakable thin connection piece. The tamper incident bottom may be formed with longitudinal breaking means extending from the upper end to the lower end of the tamper evidence bottom near the proximal end of the handle piece.

Hereinafter, with reference to the accompanying drawings showing a preferred embodiment of the synthetic resin container cover configured according to the present invention will be described in more detail.

Referring to Figures 1 to 4, the container cover made of synthetic resin represented by the reference numeral 2 as a whole constituted according to the present invention is integrally molded by injection molding or compression molding method of synthetic resin such as polyethylene and polypropylene (when molding The mold form of is mentioned again later). The container cover 2 has a circular upper wall 4, a cylindrical skirt wall 6 extending downward from the periphery of the upper wall 4, and a handle piece 8 placed on the outer circumferential surface of the skirt wall 6. ). As clearly understood in FIG. 4, a cylindrical sealing piece 10 extending downward is formed on the inner surface of the upper wall 4. The annular breaking means 12 is formed in the skirt wall 6, and the skirt wall 6 is a tamper avid lower than the main portion 14 and the annular breaking means 12 above the annular breaking means 12. It is partitioned into the bottom part 16. It is important that the annular breaking means 12 are formed by arranging the annular groove 18 on the outer circumferential surface of the skirt wall 6 to generate an annular thin wall portion, that is, a score, as clearly understood by referring to FIG. 4. Do. At the lower end of the outer circumferential surface of the main portion 14 of the skirt wall 6, an annular flange 20 extending continuously in the circumferential direction is formed. A collar 21 projecting radially outward is formed at a predetermined angular position of the annular flange 20, that is, at a position spaced about 90 degrees from the handle piece 8 in the illustrated embodiment. In the region above the annular flange 20 in the main portion 14 of the skirt wall 6 is substantially perpendicular to the boundary region of the skirt wall 6 and the upper surface wall 4 in the axial direction at intervals in the circumferential direction. A plurality of protrusions 22 are formed to extend. Engaging means 24 are formed on the inner circumferential surface of the main portion 14 of the skirt wall 6, as understood in FIGS. 3 and 4. The engaging means 24 in the illustrated embodiment is composed of three arcuate protrusions 26 which are disposed at intervals in the circumferential direction and extend in the circumferential direction. As understood by FIG. 4, the inner diameter of the tamper-avid bottom portion 16 is slightly larger than the inner diameter of the main portion 14. An engagement means 28 is also formed on the inner circumferential surface of the tamper evidence bottom portion 16. This engagement means 28 is comprised by the protrusion part 32 extended continuously in the circumferential direction except the defect part 30 in the site | part in which the lower end part of the handle piece 8 mentioned later is located.

1 and 4, the handle piece 8 attached to the outer circumferential surface of the skirt wall 6 has a proximal end 34, a raised portion 36 and an arcuate portion 38. As shown in Figs. The base end 34 extends slightly inclined to the left toward upward in FIG. 2. As clearly understood in FIGS. 3 and 4, the proximal end 34 is a relatively thick wall and is sufficiently firmly connected to the outer circumferential surface of the tamper evidence bottom 16 of the skirt wall 6. The riser 36 is thinner than the base end 34 and extends substantially vertically in the axial direction upward from the outer side in the thickness direction of the base end 34. This riser 36 extends upwards beyond the annular breaking means 12, ie beyond the top of the tamper-evidence bottom 16 of the skirt wall 6, the area of the main portion 14 of the skirt wall 6. It is important to extend to. The arcuate section 38 extends arcuately along the outer circumferential surface of the main section 14 of the skirt wall 6 in the circumferential direction at the upper end of the raised section 36, as is clearly understood in FIG. 3. As clearly shown in FIG. 2, it is important that the arcuate portion 38 is located above the annular rupture means 12. The inner surface of the raised portion 36 and the arcuate upper portion 38 of the handle piece 8 is spaced apart from the outer circumferential surface of the skirt wall 6, but as shown in FIGS. 3 and 4 in the inner surface of the arcuate upper portion 38. A breakable slender connecting piece 40 extending to the outer circumferential surface of the main portion 14 of the skirt wall 6 and more particularly to the annular flange 20 is disposed.

As shown in FIGS. 1 and 2, the tamper-avid bottom 16 of the skirt wall 6 extends from the top to the bottom of the tamper-avid bottom 16 near the proximal end 34 of the handle piece 8. Longitudinal breaking means 42 extending in the longitudinal direction (ie, the axial direction) is also formed. The longitudinal breaking means 42 in the illustrated embodiment comprises a slit 44 formed in the tamper evidence bottom 16 and a groove 46 on the outer circumferential surface of the tamper evidence bottom 16. It consists of a thin-wall portion, i. The slit 44 has a main portion 44a extending in the circumferential direction and a vertical lower portion 44b extending substantially vertically downward from one side of the main portion 44a. The groove 46 for creating the thin wall portion is connected to the portion 46a and the portion 46a extending along one side edge of the base end 34 of the handle piece 8 at the lower end of the slit 44 and the base end ( A portion 46b extending along the lower edge of the edge 34 and a portion 46c extending downward to the bottom of the tamper-avid bottom 16 are inclined to the right side in FIG. 2 further downward. In order to avoid or reduce excessive removal due to the slit 44 and the groove 46 during mold release during molding, the main part 44a and the vertical lower portion 44b of the slit 44 and In the left region of the portion 46a and the portion 46b of the groove 46, an almost flat defect surface 48 formed by missing the surface portion of the outer circumferential surface of the tamper evidence bottom portion 16 is disposed. In the right region of the portion 46c of the groove 46, an almost flat defect surface 50 formed by missing the surface portion of the outer circumferential surface of the tamper evidence bottom portion 16 is disposed.

2 and 3 also have a mold member used for forming the container cover 2, i.e., a mold member which defines the outer (upper and outer peripheral surface) of the container cover 2 As shown. This female shape is annularly fractured together with the upper mold member 52 which defines the outer periphery above the annular breaking means 12, that is, the upper surface of the upper surface wall 4 and the outer peripheral surface of the main portion 14 of the skirt wall 6. It consists of two divided members 54a and 54b which define the outer periphery of the means 12 or less, i.e. the outer circumferential surface of the annular rupture means 12 and the outer circumferential surface of the tamper evidence bottom 16 of the skirt wall 6. have. At the time of siblings, the upper mold member 52 moves linearly upward in the axial direction with respect to the container cover 2, and the two divided members 54a and 54b move linearly in both radial outward directions. Let's go. In the container cover 2 constructed in accordance with the present invention, the arcuate upper portion 38 of the handle piece 8 is located above the annular rupture means 12, and thus is provided on the two divided members 54a and 54b. It is not prescribed by the upper mold member 52 which is moved upward in the axial direction during siblings. Thus, it can be made to extend in an arc shape over the required length along the outer circumferential surface of the main portion 14 of the skirt wall 6 without the need for excessive removal during sibling. As in the container cover disclosed in Japanese Patent No. 2743160, when the handle piece is positioned below the annular rupture means, the whole handle piece is defined by two divided members, and therefore the arc portion 38 ) Must extend in a direction parallel to the direction of movement of the split member, ie in a tangential direction at the outer circumferential surface of the tamper-avior bottom (circularly arcuate along the outer circumferential surface of the tamper-avior bottom). When the two split members are moved relatively, excessive excessive removal occurs), and when the portion corresponding to the arcuate upper portion 38 is a required length, the distance between the distal end portion and the outer peripheral surface of the tamper-avior bottom is reduced. It is a problem.

FIG. 5 shows a state in which the container cover 2 shown in FIGS. 1 to 4 is attached to the aperture 56 of the glass milk bottle to seal the aperture 56. The bore 56 of the milk bottle itself is known in general and is almost cylindrical in shape, and an annular upper inflation portion 58 and an annular lower inflation portion 60 are formed on an outer circumferential surface thereof. The annular recessed portion 62 constituting the upper engagement means is defined below 58, and the annular recessed portion 64 constituting the lower engagement means is defined below the lower expansion portion 60. In the case where the container cover 2 is attached to the aperture 56, the container cover 2 is inserted into the aperture 56 and pushed down, and the main portion 14 of the skirt wall 6 as shown in FIG. The engaging means 24 formed on the inner circumferential surface of the engaging means 24, i.e. the three arcuate protrusions 26, mesh with the annular recesses 62, and the engaging means 28 formed on the inner circumferential surface of the tamper-evidence bottom 16, i.e. The protrusion 32 is engaged with the annular recess 64. As a result, the sealing piece 10 formed in the inner surface of the upper surface wall 4 is hermetically contacted with the inner circumferential surface of the aperture 56, so that the aperture 56 is sealed.

When opening the caliber 56 by detaching the container cover 2 from the caliber 56, first apply a force to the arc upper portion 38 of the handle piece 8 outward to break the slender connection piece 40. Let's do it. Subsequently, the arcuate upper portion 38 is gripped and pulled in the required direction to break the longitudinal breaking means 42 formed on the tamper evidence bottom portion 16, and more specifically, it is formed by the groove 46. Breaking the thin wall portion, and breaking the annular breaking means 12, and more particularly, breaking the annular thin wall portion formed by the annular groove 18, and thus the tamper-avid bottom portion 16 is skirted. It separates from the main part 14 of (6), and it separate | deviates from the aperture part 56. Thereafter, a finger is applied to the collar 21 formed on the main portion 14 of the skirt wall 6 to apply upward force, and the three arcuate protrusions 26 constituting the engagement means 24 are provided with a caliber. It is elastically separated from the annular recessed part 62 of 56, and the main part 14 of the upper surface wall 4 and the skirt wall 6 is separated from the aperture part 56. As shown in FIG. In the case where it is desirable to close the opened aperture 56 firstly, the container cover 2 in which the tamper evidence bottom 16 is separated, i.e., the main part 14 of the top wall 4 and the skirt wall 6 ) Is pressed into the aperture 56 and the three arcuate protrusions 26 constituting the engagement means 24 are meshed again with the annular recess 62 of the aperture 56.

In the container cover of the present invention, the annular breaking means of the skirt wall is formed by disposing an annular groove on the outer circumferential surface of the skirt wall to create an annular thin wall portion, and thus a child shape defining the outer portion of the lower portion of at least the annular groove of the skirt wall. Although it is necessary to constitute two so-called divided members that can move the portion linearly radially outward and be spaced apart from the container lid, the extension length of the handle piece can be made sufficiently long.

Claims (3)

An upper surface wall integrally formed of synthetic resin, a cylindrical skirt wall extending downward from the periphery of the upper surface wall, and a handle piece, The skirt wall is provided with annular breaking means extending in the circumferential direction, and the skirt wall is divided into a main portion higher than the annular breaking means and a tamper-avior bottom portion lower than the annular breaking means. Engaging means is formed on the inner circumferential surface of the main portion of the skirt wall, The annular breaking means is formed by disposing an annular groove on the outer circumferential surface of the skirt wall to create an annular thin wall portion, The handle piece has a proximal end connected to an outer circumferential surface of the bottom of the tamper, a raised portion extending upward from the proximal end beyond the annular rupture means, and the annular rupture along the outer circumferential surface of the skirt wall at the raised portion. Having an arcuate portion extending upward in an arcuate shape than the means Container cover made of synthetic resin, characterized in that. 2. The container cover made of synthetic resin according to claim 1, wherein an inner surface of the arc-shaped portion of the handle piece is connected to an outer circumferential surface of the main portion of the skirt wall through a breakable narrow connecting piece. 3. The synthetic resin according to claim 1 or 2, wherein the tamper evidence bottom is provided with longitudinal breaking means extending from the upper end to the lower end of the tamper evidence bottom near the base end of the handle piece. Container cover.