JP4818739B2 - Plastic cap - Google Patents

Description

  The present invention relates to a shape of a bridge provided between a lower end portion of a skirt wall of a synthetic resin cap, particularly a synthetic resin cap formed by injection molding, and a tamper evident band.

  A synthetic resin cap with a tamper evident band (hereinafter referred to as a TE band) is connected to the bottom of the skirt wall and the TE band by a bridge that breaks at the time of opening, and the presence or absence of opening is identified by observing the breaking of the bridge. The tamper evidence is ensured. By the way, the synthetic resin cap with a TE band may be formed by molding in the case where the cut gap between the bridges is formed by a mold at the time of cap molding or by post-processing after cap molding. In this case, there is a relatively large gap (groove) between the lower end of the skirt wall and the TE band, and a plurality of bridges are formed across the gap. There are very small gaps. By the way, in order to make the winding strength and the opening strength constant, it is desirable that the bridges are evenly arranged in the circumferential direction, and that all the bridges have the same shape and the same strength. However, since the bridge is arranged on the radiation, the direction of the bridge also becomes the radial direction, and the directions of the bridges are different from each other. When the bridge and the gap are formed by injection molding or the like, the female mold composed of two split molds And a male mold, the bridge in a direction different from the opening / closing direction of the split mold is undercut, and the die cannot be removed after molding. Therefore, as shown in FIG. 6 (a), the shape of the bridge 40 must be changed in accordance with the position of the bridge in order to align the shape of the bridge 40 in the die cutting direction so that the bridge 40 is not undercut. There is a problem in that bridges having the same shape cannot be arranged evenly due to restrictions on the shape, size, number and arrangement thereof. In FIG. 6, 41 is a skirt wall, 42 is a TE band, and 43 is an engagement flap.

Further, the bridge is broken by opening and the broken pieces remain as protrusions on the lower end of the skirt wall and the upper end of the TE band. If the bridge is reliably broken from the middle part, the broken pieces will remain as protrusions of equal height on the lower end of the skirt wall and the upper end of the TE band. In this case, the height of the protrusion is low, so the lower end of the cap skirt wall after opening Or even if a finger or a lip touches the upper end of the TE band, it does not give much stimulation. However, the break of the bridge is not always broken from the middle, and in extreme cases, it may be broken from its base, and in such a case, a high protrusion remains on either the lower end of the skirt wall or the upper end of the TE band. In other words, there is a problem that a strong stimulus is given by touching it with a finger or the like.
In order to solve such problems, the bridge has a trapezoidal plate shape with a slope inclined to the inside of the cap at the upper end, and the upper width is narrower than the lower width, and the upper end outer surface is the inner surface of the lower end of the skirt wall. In order to eliminate the undercut with respect to the split mold, the outer surface of the lower end is connected to the inner surface of the upper end of the TE band (Patent Document 1).
Japanese Patent Laid-Open No. 2001-301786

  The above-mentioned proposal solves the above-mentioned conventional problems in that the undercut for the female mold is eliminated and the bridge can be formed in the same shape. However, it is not yet satisfactory in that a bridge in which a cavity is formed in a male mold is forced out of the male mold. In addition, since the bridge is cut from the lower end of the skirt wall, there is little remaining broken piece of the bridge at the lower end of the skirt wall of the cap, but a larger broken piece remains on the upper end of the TE band, and the TE band remaining in the neck of the bottle mouth. There is a problem to be solved in that a finger or lip touches the upper end of the finger to cause a strong stimulus to the broken piece.

  Therefore, the present invention provides a synthetic resin cap with a TE band formed by injection molding, can freely provide the shape, size and number of bridges, can maintain a stable opening strength, and There is no undercut when punching, it can be easily punched out, the break position of the bridge can be specified at almost the center position of the bridge, and no large broken pieces remain at the lower end of the skirt wall and the upper end of the TE band. An object is to provide a cap made of synthetic resin.

The synthetic resin cap of the invention of claim 1 which solves the above-mentioned problems is the synthetic resin cap having a tamper-evidence band connected to the lower end of the skirt wall by a bridge through a certain gap, and the inner circumference of the skirt wall The surface has a skirt wall lower inner peripheral surface through a step surface at a lower end of the skirt wall upper inner peripheral surface, and the bridge has a skirt wall connecting portion whose upper portion is connected to the skirt wall lower inner peripheral surface. And a lower part is a tamper-evidence band connecting part connected to an inner peripheral surface of the tamper-evidence band, and an upper end of the skirt wall connecting part extends to the step surface of the skirt wall body and is connected. and inscribed bridge, an upper portion extending from the skirt wall lower end to near the middle of the gap on the outside of the inner contact bridge, said the upper end of the tamper evident band Is characterized in that a lower portion which extends to near the middle between has an auxiliary bridge is integral with the internal bridge to form a constricted portion having a constant interval.
Further, the invention according to claim 2 is the synthetic resin cap according to claim 1, wherein the inscribed bridge is formed with a wide wall thickness from the skirt wall connecting portion to a substantially middle portion of the gap. The lower part including the tamper-evident band connecting part below the wide-walled thick part is a thin-walled thin part formed thinly and thinly.

The synthetic resin cap of the invention of claim 3 which solves the above-mentioned problems is a synthetic resin cap having a tamper-evident band connected by a bridge to a lower end of the skirt wall through a certain gap, and the inner periphery of the skirt wall The surface has a skirt wall lower inner peripheral surface through a step surface at a lower end of the skirt wall upper inner peripheral surface, and the bridge has a skirt wall connecting portion whose upper portion is connected to the skirt wall lower inner peripheral surface. And a lower part is a tamper-evidence band connecting part connected to an inner peripheral surface of the tamper-evidence band, and an upper end of the skirt wall connecting part extends to the step surface of the skirt wall body and is connected. consists inscribed bridge, inner contact bridge above the skirt wall connecting portion to a substantially middle portion of the gap becomes a wide thick portion formed in the wide thick, wide- Downward from the thick portion containing the tamper evident band connection portion of the lower is characterized in that has a narrow thin portion formed in the narrow thin.
Furthermore, the invention of claim 4 is the synthetic resin cap according to claims 1 to 3, characterized in that two bridges are provided at predetermined intervals in the circumferential direction.

According to the invention of claim 1, in the TE band formed by injection molding or the like, the shape, size, and number of bridges can be freely provided, and the mold can be easily formed without undercutting during die cutting. Can be removed. As a result, the cross-sectional shape of all the bridges can be formed in the same shape, the breaking strength of the bridges can be made uniform, the arrangement of the bridges can be equalized, the bridges can be prevented from breaking when the caps are attached, and the caps are opened. The strength can be kept constant, and the tamper evidence can be improved. In addition, since the shape of the bridge can be made the same, there is an advantage that mold processing is easy.
Further, according to the invention of claim 2, in addition to the above-mentioned effect, the break position of the bridge can be specified at the substantially center position of the bridge portion by the auxiliary bridge, and a large broken piece remains at the lower end of the skirt wall and the upper end of the TE band. No synthetic resin cap can be obtained. Furthermore, according to the invention of claim 3, since the inscribed bridge is provided so that the cross-sectional shape is suddenly changed into a wide-thick part and a thin-thin part at a substantially middle part of the gap, the effect of the auxiliary bridge is achieved. In addition, the break position of the bridge can be made more effective, and a safer synthetic resin cap can be obtained. In addition, since an auxiliary bridge does not constitute a normal bridge by itself, the auxiliary bridge has a very small protruding amount and has a substantially uniform shape. Therefore, the breaking strength of the bridge is not different.
Furthermore, according to the invention of claim 4, since two bridges are provided adjacent to each other, each bridge can be thinned to have strength, and the flow of washing water between the bridges at the time of washing can be improved accordingly. Therefore, it is particularly suitable for a cap for filling the contents of a chair that attaches the contents to the bottle mouth.

Hereinafter, a synthetic resin cap according to an embodiment of the present invention will be described in detail with reference to the drawings.
1 is a front view of a synthetic resin cap, FIG. 2 is a cross-sectional front view, FIG. 3 is a plan view taken along the line AA in FIG. 2, and FIG. 4 is an enlarged view corresponding to a cross section taken along line BB in FIG. FIG. 5 and FIG. 5 are CC cross-sectional arrow views of FIG. In the figure, reference numeral 1 denotes a synthetic resin cap, and a TE band 4 is provided at the lower end of the skirt wall 2 via a plurality of bridges 3. The upper end surface of the TE band 4 is provided with support protrusions 6 projecting at a predetermined interval in a gap 5 formed between the lower end portion of the skirt wall 2 and the TE band. When an axial force is applied, the bridge 3 is prevented from being damaged by coming into contact with the lower end of the skirt wall. Reference numeral 7 denotes a stopper provided at the upper end of the TE band, and reference numeral 8 denotes a stopper provided at the lower end of the skirt wall. Since these structures can adopt the same structure as a conventional cap as appropriate, detailed description thereof is omitted. Only the configuration of the bridge which is a characteristic part of the present invention will be described in detail.

  The bridge structure of the synthetic resin cap according to the present embodiment is characterized in that a cavity is formed in the male mold so that the bridge does not undercut when the female mold comprising the split mold after injection molding is cut. And the upper end of the inscribed bridge is devised not to be undercut when the male die is cut, and further has an auxiliary bridge so that the bridge is cut at a specific position. The features are best shown enlarged in FIGS.

In the synthetic resin cap according to the present embodiment, the inner peripheral surface of the skirt wall 2 has a skirt wall lower inner peripheral surface 30 via a step surface 33 extending outward at the lower end of the skirt wall upper inner peripheral surface 32. ing. The bridge 3 according to this embodiment includes an inscribed bridge 10 and an auxiliary bridge 11. As shown in FIGS. 4 and 5, the inscribed bridge 10 has a skirt wall connecting portion 12 whose upper portion protrudes inwardly and connects to the inner peripheral surface 30 of the skirt wall lower portion, and the lower portion is located above the TE band. A TE band connecting portion 13 projecting inwardly and connected to the peripheral surface 31 is formed, and a middle portion thereof is a bridging portion 14 facing the gap 5 between the lower end of the skirt wall and the upper end of the TE band. 2 skirt wall lower inner peripheral surface 30 and TE band upper inner peripheral surface 31 is formed inscribed. The upper end of the skirt wall connecting portion 12 extends from the skirt wall upper inner peripheral surface 32 to the stepped surface 33 inclined to the skirt wall lower inner peripheral surface 30 as shown in FIG. This eliminates the formation of an undercut at the upper end of the inscribed bridge 10, and completely eliminates the unreasonable removal caused by the bridge when the male die (core die) is die-cut downward.
In the present embodiment, as shown in FIG. 4, the inscribed bridge 10 has a wide and thick wall with the same width as the skirt wall connecting portion 12 up to the lower end position of the upper portion 21 of the auxiliary bridge described later. It is formed in the thick portion 17, and the thin and thin portion 18 is formed by thinning and narrowing the wide band portion through the vertical step surface 16 to the TE band connection portion 13 (see FIGS. 2 to 5). ). Thereby, the breakage of the bridge at the time of opening the plug is made easy to break the stress concentrated at the lower end position of the vertical stepped surface 16, and the breakage position is combined with the function of the auxiliary bridge described later. It was made to be surely specified at about 14 intermediate positions. It is important that the lower end position of the wide-thickness portion 17 is provided at least at a position corresponding to the constricted portion 23 of the auxiliary bridge 11 to be described later, and is preferably provided at the lower end position of the upper portion 21 of the auxiliary bridge 11.

  The auxiliary bridge 11 has an upper part 21 extending from the lower end of the skirt wall to the vicinity of the middle of the gap, and the upper end of the tamper evidence band. A constricted portion 23 having a constant interval is formed with a lower side portion 22 extending to the vicinity of the middle of the gap, and is formed integrally with the inscribed bridge. As shown in FIGS. 4 and 5, the shape of the upper side portion 21 and the lower side portion 22 of the auxiliary bridge 11 is such that the outer peripheral surface has a generally gentle curved shape and does not undercut when the female die is cut. Is formed. As shown in FIG. 5, the width in the circumferential direction of the upper side portion 21 and the lower side portion 22 is formed to be the same width as the wide-thickness portion 17 of the inscribed bridge 10, and the stable strength and cutting position of the bridge are determined. We are trying to identify it.

  Further, in this embodiment, as shown in FIGS. 2 and 3, two bridges 3 including the inscribed bridge 10 and the auxiliary bridge 11 are provided adjacent to each other, and a plurality of the bridges 3 are set at regular intervals in the circumferential direction. (8 sets in the embodiment shown in the figure) are arranged. As a result, the bridge and the container after capping are designed to minimize the blocking of the passage of washing water by the bridge during washing after capping of the cap, to enhance the washing effect, and to provide bridge strength. The cleaning effect of the mouth was improved. However, the present invention is not limited to this. For example, a plurality of (for example, eight) larger bridges shown in FIG. 3 may be formed at equal intervals in the circumferential direction.

  The synthetic resin cap of the present embodiment is configured as described above, and the inscribed bridge 10 is provided so as to protrude from the inner peripheral surface 30 of the skirt wall lower part and the inner peripheral surface 31 above the TE band, and is molded by a male cavity. Therefore, there is no need to change the shape of each bridge in order to align the shape of the bridge in the die-cutting direction as in the prior art because there is no hindrance to the die-cutting of the female die that is a split die. The shape, size, and number of bridges can be freely provided. Accordingly, the cross-sectional shape of the bridge can be formed in the same shape, the breaking strength of the bridge can be made uniform, the bridge arrangement can be equalized, partial breakage of the bridge when the cap is attached, and opening Tamper evidence at the time can be improved. In addition, since the shape of the bridge can be made the same, there is an advantage that mold processing is easy. The auxiliary bridge 11 is formed by a female cavity. As shown in FIGS. 4 and 5, the outer peripheral surface of the auxiliary bridge 11 is formed in a gentle curved shape in both the circumferential direction and the height direction. Sometimes there is no undercutting and it can be easily punched. Since the auxiliary bridge 11 has no intermediate portion between the upper side portion 21 and the lower side portion 22 and only the narrow thin portion 18 of the inscribed bridge exists in the portion, the bridge as a whole has a constricted shape, and the vertical portion thereof. Since the thickness change due to the stepped surface and the auxiliary bridge is an abrupt portion, the force applied to the bridge at the time of opening the plug is concentrated on this portion and is cut therefrom. Therefore, it is always possible to cut at a predetermined position of the bridge bridging portion, and it is possible to arbitrarily set the remaining degree of the bridge residue on the lower end of the skirt wall and the upper end of the TE band after opening the cutting position. For example, if the position of the constricted portion 23 is set not at the middle position of the bridge portion but near the lower end of the skirt wall, the remaining amount of the bridging fragments increases at the upper end of the TE band, and conversely when set closer to the TE band, The remaining amount of bridge breakage at the bottom of the wall increases.

  The synthetic resin cap of the present invention is a cap for a synthetic resin container, a glass container or a paper container formed by injection molding, and is particularly suitable for aseptic filling as a filling method. It can be applied to any filling such as a pack or room temperature filling, and can be suitably used regardless of whether the internal pressure of the container is a negative pressure or a positive pressure.

1 is a front view of a synthetic resin cap according to an embodiment of the present invention. It is the cross-sectional front view. FIG. 3 is a plan view taken along line AA in FIG. 2. It is a BB cross-sectional enlarged view of FIG. It is CC sectional view taken on the line of FIG. (A) is the cutting | disconnection top view of the bridge | bridging position etc. of the conventional injection-molded synthetic resin caps, (b) is the enlarged view of the DD cross section.

Explanation of symbols

1 Synthetic resin cap 2 Skirt wall 3 Bridge
4 Tamper Evidence (TE Band) 5 Gap 6 Supporting ridge 7, 8 Stopper 10 Inscribed Bridge 11 Auxiliary Bridge 12 Skirt Wall Connection 13 TE Band Connection 14 Crosslinking 16 Vertical Step 17 Wide Wide Thickness 18 Narrow Thin portion 21 Upper portion 22 Lower portion 23 Constricted portion 30 Skirt wall lower inner peripheral surface 31 TE band upper inner peripheral surface 32 Skirt wall upper inner peripheral surface 33 Step surface

Claims (4)

In the synthetic resin cap having a tamper evidence band connected to the lower end of the skirt wall by a bridge through a certain gap, the inner peripheral surface of the skirt wall is connected to the lower end of the inner peripheral surface of the skirt wall via a step surface. A lower wall inner peripheral surface, the bridge
The upper part is a skirt wall connection part connected to the inner peripheral surface of the skirt wall lower part, and the lower part is a tamper evidence band connection part connected to the inner peripheral surface of the tamper evidence band, and the skirt wall connection part The upper end of the inscribed bridge extends to the stepped surface of the skirt wall body and is connected ,
An upper part extending from the lower end of the skirt wall to the vicinity of the middle of the gap and a lower side part extending from the upper end of the tamper evidence band to the vicinity of the middle of the gap at the outside of the inscribed bridge have a constant interval. Auxiliary bridge that is integrated with the inscribed bridge
A synthetic resin cap characterized by comprising: The inscribed bridge is a wide-thickness portion formed in a wide-thickness portion from the skirt wall connection portion to a substantially middle portion of the gap, and includes a tamper-evident band connection portion below the wide-thickness portion. The synthetic resin cap according to claim 1, wherein the lower portion is a narrow thin portion formed thin and thin. In the synthetic resin cap having a tamper evidence band connected to the lower end of the skirt wall by a bridge through a certain gap, the inner peripheral surface of the skirt wall is connected to the lower end of the inner peripheral surface of the skirt wall via a step surface. It has a wall lower inner peripheral surface,
The bridge has a skirt wall connection portion whose upper portion is connected to the inner peripheral surface of the skirt wall lower portion, and a tamper evidence band connection portion whose lower portion is connected to the inner peripheral surface of the tamper evidence band, and The upper end of the skirt wall connecting portion is composed of an inscribed bridge that extends and connects to the step surface of the skirt wall body,
The inscribed bridge is a wide-thickness portion formed in a wide thickness from the skirt wall connection portion to a substantially middle portion of the gap, and a tamper-evident band connection portion below the wide-thickness portion is provided. A synthetic resin cap characterized in that the lower part is a narrow thin part formed thin and thin.   The said bridge | bridging is a synthetic-resin cap in any one of Claims 1-3 by which the said bridge | bridging is provided in the circumferential direction as a pair by two.

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