JP5019465B2 - Plastic cap - Google Patents

Description

  The present invention relates to a synthetic resin cap, and more particularly to a synthetic resin cap having improved detergency of a weakened portion that defines a lower end of a skirt wall and a tamper evidence band portion.

  In a synthetic resin cap with a tamper evident band (hereinafter referred to as a TE band) that has been widely used as a cap for sealing a container such as a bottle filled with the content liquid, the content liquid filling in the manufacturing process of the packaged beverage Washing of dirt due to liquid contents overflowing from the container mouth and adhering to the outer peripheral surface of the container mouth during transfer of the container from the filling position to the capping position, and dirt adhering to the inner peripheral surface of the cap by capping in that state In order to make this possible after capping, a rinse slit is provided in the upper part of the skirt wall so that cleaning water can flow into the engaging part between the inner peripheral surface of the cap and the outer peripheral surface of the bottle mouth during cleaning. It has been put into practical use (for example, Patent Document 1). FIG. 5 shows an example of such a conventional cap. A linear rinse slit 52 is formed at a predetermined interval in the circumferential direction at a position above the screw portion of the skirt wall 51 of the synthetic resin cap 50, and the lower end of the skirt wall 51 is formed. A bridge 56 continuous with a step surface 55 at the lower end of the skirt wall is formed at a predetermined pitch in the circumferential direction at the upper end of the inner peripheral surface of the TE band 54 at the bottom of the cylindrical skirt that extends from the lower end of the skirt wall. A continuous circumferential slit 57 is formed by post-processing so as to reach the bridge 56 from the outer peripheral surface to define a TE band. FIG. 6 shows an engaged state between the synthetic resin cap 50 and the container mouth portion 60. In the sealed state shown in FIG. 6, the cleaning water sprayed by the cleaning nozzle from the side of the cap at the time of cleaning by a shower or from the side toward the rinse slit is the outer peripheral surface of the skirt wall of the cap as shown by the arrow in the figure. And a part flows from the rinse slit 52 into the gap between the inner surface of the cap and the outer peripheral surface of the bottle mouth, and flows down along the inner peripheral surface of the cap and the outer surface of the container mouth. The content liquid adhering to the engagement portion between the cap and the container is washed away by flowing downward beyond the jaw portion 61 with which the flap of the TE band formed in the container mouth portion 60 is engaged. Yes.

  In that case, the cleaning water flowing along the inner peripheral wall surface of the cap inner wall may enter the circumferential slit 57 and ooze out to the cap surface through the slit and / or remain in the slit. In particular, as shown in FIG. 6, the circumferential slit 57 is opposed to the vicinity of the jaw 61 (cabra) 61 of the container mouth portion, so that the interval between the circumferential slits 57 is small and it is difficult for the cleaning liquid to pass therethrough. There is a problem that it easily comes into contact with the outer peripheral surface of the part and oozes out due to capillary action and remains attached to the part. In particular, when the content liquid is of tea beverage type such as oolong tea, the adhering residue is dried and remains as a tea astringent in the circumferential slit portion in a wide range, and the dirt becomes conspicuous. Therefore, in order to clean the circumferential slit portion from the outside, it has been proposed to provide a nozzle or the like that jets cleaning water in the horizontal direction toward the circumferential slit portion to intensively clean the circumferential slit portion. (Patent Documents 2 and 3). In that case, there are problems such as installation of a special nozzle or the like in the shower device and the need for equipment costs and a large amount of washing water.

  Therefore, in order to solve this problem, the present applicant forms a shower water reservoir pocket across the circumferential slit on the outer peripheral surface of the cap, so that cleaning water from the outer surface can easily enter the circumferential slit. In this way, a synthetic resin cap that can clean the circumferential slit by a simple method has been proposed (see Patent Document 4).

Japanese Patent Laid-Open No. 10-152156 JP 2000-7096 A JP 2000-85727 A JP 2006-264706 A

  All of the above-mentioned conventionally proposed synthetic resin caps attempt to clean the slits by spraying or bringing in the cleaning water from the inner peripheral surface of the skirt wall into the circumferential slit and spraying or contacting the cleaning water from the outside of the cap. Dirt that oozes out from the slit can be cleaned well by these methods, but if the circumferential slit is a narrow slit formed by cutting with a cutter in post-processing, it is washed Since water infiltrates into the slit due to capillary action, in this case, the dirt cleaning water that has infiltrated from the inside and the cleaning water that has infiltrated from the outside collide in the slit and remain in that portion, and remain in the slit. There is a problem that cannot be washed well. This problem cannot be solved fundamentally as long as there is a risk of dirt cleaning water infiltrating into the circumferential slit, and there is a problem to be solved in that the dirt on the slit cannot be eliminated fundamentally. .

  Accordingly, the present invention is intended to solve the above-mentioned problems, and it is possible to reliably prevent the circumferential slit of the weakened portion from being contaminated by the infiltration of the dirt cleaning water with a simple structure, thereby improving the cleaning performance. An object is to provide a cap made of synthetic resin.

As a result of diligent research in order to solve the above problems, the present inventor changed the conventional idea of cleaning dirt due to dirt cleaning water that has infiltrated into the circumferential slit, and the dirt cleaning water in the circumferential slit. The present invention has been conceived by conceiving a means for preventing the infiltration of the peripheral slit and making the circumferential slit itself difficult to get dirty.
That is, the synthetic resin cap of the present invention that solves the above problems is a synthetic resin cap having a tamper-evident band at the lower end of the skirt wall through a weakened portion. On the inner peripheral side of the wall lower portion, there is provided dirt cleaning water infiltration preventing means for preventing the dirt cleaning water from infiltrating from the inner peripheral side of the skirt wall into the circumferential slit constituting the weakened portion from the inner peripheral side of the skirt wall. In the synthetic resin cap having a tamper-evidence band via a weakened portion at the lower end of the skirt wall, the circumferential shape constituting the weakened portion from the inner peripheral surface side of the weakened portion from the inner surface side of the skirt wall The present invention is characterized in that dirt cleaning water intrusion preventing means for preventing dirt cleaning water from entering the slit is provided.

  The weakened portion is connected to the lower end of the skirt wall through the stepped surface from the lower end inner peripheral side and the circumferential slit formed in the thin cylindrical portion through the stepped surface from the lower portion of the inner peripheral surface of the skirt wall A circumferential slit formed in the thin-walled cylindrical portion, and a bridge whose upper end is suspended from the stepped surface and is connected to the thin-walled cylindrical portion beyond the circumferential slit and disposed at a predetermined pitch in the circumferential direction. In the case of the synthetic resin cap formed as described above, the dirt cleaning water intrusion prevention means is an annular tongue formed by hanging downward from the step surface at the lower end of the skirt wall radially inward from the bridge. Can be configured. The annular tongue piece is preferably formed so as to extend to a position below the circumferential slit forming position and to cover at least the inner surface side opening of the circumferential slit so as to cover the circumferential slit. It is not always necessary to extend to a position below the circumferential slit forming position, and the lower end of the circumferential slit forming position can be formed shorter than the circumferential slit forming position.

  As described above, the cleaning water that has flowed down along the inner side surface of the skirt wall by configuring the dirt cleaning water intrusion prevention means as an annular tongue piece that hangs downward from the stepped surface that follows the lower inner peripheral surface of the skirt wall. Is blocked by the annular tongue and is prevented from flowing into the circumferential slit, and flows down from the lower end of the annular tongue and does not reach the circumferential slit position.

Further, the dirt cleaning water permeation preventing means is formed as an annular tongue piece that hangs downward from the step surface at the lower end of the skirt wall, and is recessed in the axial direction upward from the inner peripheral surface at the lower end of the skirt wall. It can also be formed as a recessed stepped surface extending outward.
Contamination cleaning in which the concave step surface is transmitted along the inner peripheral surface of the skirt wall by configuring the tamper evidence band on the outer peripheral surface side of the concave step surface through the circumferential slit and the bridge. Infiltration of water into the circumferential slit can be prevented.

  By forming a recess step surface that is recessed upward in the axial direction from the inner peripheral surface at the lower end of the skirt wall and extends outward, the dirt cleaning water that has flowed down along the inner surface of the skirt wall reaches the recess step surface. Since the depressed concave surface cannot be raised, it cannot fall from the lower edge of the skirt wall and reach the circumferential slit, and the inflow of the dirt cleaning water to the circumferential slit can be prevented.

  According to the present invention, it is possible to prevent the dirt cleaning water after cleaning the inner peripheral surface of the cap and the outer peripheral surface of the container mouth from entering the peripheral slit, so that the inside of the peripheral slit and the peripheral It is possible to reliably prevent the dirt cleaning water from oozing out of the slit. Therefore, in order to wash away the dirt cleaning water that has permeated into the circumferential slit, there is almost no need to inject the cleaning water from the outside by a nozzle or the like toward the circumferential slit as before, and the cleaning equipment is simplified. And reduction of washing water. Also, for example, the washing water sprayed on the outer peripheral surface of the cap by a shower device and flowing down along the outer peripheral surface of the skirt wall infiltrates into the slit from the peripheral slit due to capillary action, but unlike the conventional cap, Since there is no infiltration of dirt cleaning water from the peripheral surface side, the cleaning water from the outside can infiltrate well into the slit and easily exude between the inner jaw and the inside of the slit. In addition, since it can contribute to the cleaning of the area between the slit and the jaw portion that is easily soiled, it is possible to obtain a synthetic resin cap superior in cleaning performance compared to the conventional one. In addition, since the shape of the synthetic resin cap simply forms the annular tongue piece or the recessed step surface on the conventional cap, it can be easily configured with slight changes in the configuration of the conventional synthetic resin cap, Can be easily obtained.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the shape and structure of the synthetic resin cap according to the present invention is not limited to this embodiment.
FIG. 1 shows a synthetic resin cap according to an embodiment of the present invention, and FIG. 2 shows a cross-sectional view of a main part in a state where the cap is attached to a bottle. As clearly shown in FIG. 1, the synthetic resin cap 1 according to the present embodiment has a tamper evident band 6 at the lower end of the skirt wall 2 via a weakened portion 9 including a circumferential slit 7 and a bridge 8. In the synthetic resin cap, the skirt wall 2 having the screw 3 formed on the inner surface has rinse slits 4 formed at appropriate intervals in the circumferential direction at a position above the screw 3. The dirt cleaning water that flows into the screw engaging portion from the rinse slit 4 and flows down through the inner peripheral surface 11 of the skirt wall and / or the outer peripheral surface 62 of the container mouth and cleaning these portions into the peripheral slit 7. A cleaning water infiltration preventing means for preventing infiltration is provided.

As in the conventional example, the weakened portion 9 in the present embodiment has a substantially horizontal step surface 12 on the inner side from the lower end of the inner peripheral surface of the skirt wall, as shown in enlarged views in FIGS. Through the circumferential slit 7 formed over the entire circumference in the portion that has become the thin cylindrical portion 13, and the upper end that continues through the circumferential slit 7 hangs down from the step surface 12, and passes over the circumferential slit 7 to the thin cylindrical portion 13. The bridges 8 are connected and arranged at a predetermined pitch in the circumferential direction. The thin-walled cylindrical portion 13 is partitioned by the circumferential slit 7, and the upper portion thereof is a skirt wall lower end portion, and the lower portion thereof is a TE band upper end portion.
In the synthetic resin cap 1 composed of such a weakened portion, in this embodiment, as a washing water intrusion prevention means, the inner peripheral end of the step surface 12 protrudes so as to be positioned on the downward extension of the inner peripheral surface 11 of the skirt wall. An annular tongue piece 15 is provided. That is, the annular tongue piece 15 is formed so as to hang downward from the step surface 12 of the skirt wall to the inside in the radial direction from the bridge 8 and continuously to the lower portion on the inner peripheral surface side of the skirt wall. As shown in an enlarged view in FIG. 2 (b), the annular tongue piece 15 preferably extends from the slit position to a lower position so as to cover at least the inner peripheral opening end of the circumferential slit 7.
The TE band upper end portion is a thin cylindrical portion 13, and the bridge 8 is intermittently formed integrally at a predetermined pitch across the inner peripheral surface of the thin cylindrical portion 13 and the stepped surface 12, and after the molding, By the post-processing, a circumferential slit 7 whose tip reaches the bridge 8 is formed over the entire circumference in the height direction range in which the bridge 8 of the thin cylindrical portion 13 is disposed. In this embodiment, in the cap formed of the weakened portion, the annular tongue piece 15 that protrudes so as to be located on the inner peripheral end of the step surface 12 so as to be located on the downward extension of the inner peripheral surface 11 of the skirt wall as the washing water intrusion prevention means. Is provided. As shown in an enlarged view in FIG. 2 (b), the annular tongue piece 15 preferably extends from the slit position to a lower position so as to cover at least the inner peripheral opening end of the circumferential slit 7.

  The synthetic resin cap of the present embodiment is formed as described above, and in the cleaning process of the container filled and sealed with the content liquid, the cleaning liquid infiltrated from the rinse slit 4 by the shower from above or nozzle injection from the side is It gradually flows downward as indicated by the arrow along the thread outer peripheral surface of the container mouth and the thread of the inner peripheral surface of the cap, and finally from the gap between the lower end of the TE band 6 and the jaw 61 of the bottle mouth. The content liquid adhering to the outer peripheral surface of the bottle mouth is washed away by flowing out. At that time, the dirt cleaning water flowing down along the inner peripheral surface 11 of the skirt wall flows down along the annular tongue piece 15 as it is, falls as it is from the tip edge thereof, reaches the flange portion of the bottle, and comes outside. Therefore, the intrusion path of the dirt cleaning water into the circumferential slit 7 is blocked by the annular tongue piece 15, and the penetration of the dirt cleaning water into the circumferential slit 7 can be reliably prevented.

  On the other hand, the cleaning water flowing down the outer peripheral surface of the cap cleans the outer peripheral surface of the cap, and a part of the cleaning water that has reached the position of the peripheral slit 7 of the weakened portion penetrates into the peripheral slit due to capillary action. The circumferential slit 7 is washed by passing through the slit and flowing down from the inner peripheral surface side of the cap. In this case, unlike the case of cleaning the conventional synthetic resin cap shown in FIGS. 5 and 6, since there is no infiltration of dirt cleaning water from the inner peripheral surface side of the cap, the infiltration of cleaning water from the outer peripheral surface side is eliminated. Even if the circumferential slit is dirty, it can be easily cleaned and has excellent cleaning properties. In addition, in the case of the present embodiment, the annular tongue piece 15 extends to a position below the circumferential slit forming position and covers the inlet of the circumferential slit 7. It is possible to reliably prevent the dirt cleaning water flowing out in the direction of the slits from coming into contact with the circumferential slits.

FIG. 3 shows a synthetic resin cap according to another embodiment of the present invention, which corresponds to FIG. 2 in the above embodiment. The synthetic resin cap 30 in the present embodiment is different from the synthetic resin cap 1 in the embodiment in that the annular tongue piece as the dirt cleaning water infiltration preventing means is formed shorter than the embodiment. Since other configurations are the same as those of the above-described embodiment, only differences will be described.
That is, the annular tongue 31 in the synthetic resin cap of the present embodiment extends slightly below the position where the circumferential slit 7 is formed, or extends only to a position where it does not reach the position where the circumferential slit 7 is formed. Absent. However, even in this case, the dirt cleaning water flowing down along the inner peripheral surface of the cap is prevented from flowing around the stepped surface 12 by the annular tongue piece 31 and flows down or drops from the tip edge of the annular tongue piece. It is possible to effectively prevent the dirt cleaning water on the inner peripheral surface side of the cap from entering the circumferential slit 7.

  FIG. 4 shows a synthetic resin cap according to still another embodiment of the present invention, which corresponds to FIG. 2 in the above embodiment. The synthetic resin cap 40 in the present embodiment has a concave portion with the stepped surface facing downward instead of providing an annular tongue piece as a dirt cleaning water infiltration preventing means in the synthetic resin cap 1 in the above embodiment. It is characterized in that it is formed on the step surface of the recess and serves as a dirt cleaning water permeation preventing means, and the other configuration is the same as in the above embodiment, so only the differences will be described.

  That is, in the synthetic resin cap 40 of this embodiment, as shown in an enlarged view from the lower end edge 41 of the inner peripheral surface 11 of the skirt wall in FIG. 4B, it is substantially horizontal in the conventional synthetic resin cap shown in FIG. The step surface portion is formed as a downward recessed step surface 42 extending outward in the axial direction upward, and the TE band 6 is provided on the outer peripheral surface side of the recessed step surface 42 via the circumferential slit 7 and the bridge 43. It is connected continuously. The concave step surface 42 functions as a dirt cleaning water intrusion preventing means for preventing the dirt cleaning water from entering the circumferential slit 7 along the inner peripheral surface 11 of the skirt wall. In the case of the present embodiment, the stepped surface is a concave stepped surface 42 that faces downward in a substantially arcuate shape, so that the dirt cleaning water that flows down along the inner peripheral surface of the cap has It cannot flow through, cannot flow down from the lower end edge 41 of the inner peripheral surface of the skirt wall, and cannot reach the circumferential slit 7. Accordingly, the concave step surface 42 functions as a means for preventing the entry of the dirt cleaning water into the circumferential slit, effectively preventing the dirt cleaning water from flowing into the slit, and the dirty water adheres to the circumferential slit 7 and remains. Can be prevented.

  The cap made of the synthetic resin of the present invention is applied particularly as a cap for a container-packed beverage, so that the content liquid adheres to the outer peripheral surface of the container mouth when the container is filled with the content liquid, and the TE band weakened portion after sealing It is possible to efficiently clean the dirt due to the content liquid that has oozed into the slits in the shower process, and it is effective especially for beverage filling containers for hot filling. The applicability is high as a cap for a container to be used for manufacturing a container. The synthetic resin cap of the present invention is not limited to a screw-type cap, and may be a stopper-type cap.

It is a partial cross section front view of the synthetic resin caps concerning the embodiment of the present invention. (A) is principal part sectional drawing in the state which screwed the cap of FIG. 1 to the bottle mouth, (b) is an enlarged view of the A section. (A) is principal part sectional drawing in the state which screwed the cap which concerns on other embodiment of this invention to the bottle mouth, (b) is an enlarged view of the B section. (A) is principal part sectional drawing in the state which screwed the cap which concerns on further another embodiment of this invention to the bottle mouth, (b) is an enlarged view of the C section. It is a partial cross section front view of the conventional synthetic resin caps. (A) is principal part sectional drawing in the state which screwed the cap of FIG. 5 to the bottle mouth, (b) is an enlarged view of the D section.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Synthetic resin cap 2 Skirt wall 3 Screw 4 Rinse slit 6 TE band 7 Circumferential slit 8 Bridge 9 Weak part 11 Skirt wall inner peripheral surface 12 Step surface 13 Thin-walled cylindrical portion 15 Annular tongue piece 31 Annular tongue piece 42 Recessed step surface 43 Bridge 60 Container mouth part 61 Jaw part 62 Container mouth outer peripheral surface

Claims (4)

  In the synthetic resin cap having a tamper evidence band at the lower end of the skirt wall through the weakened portion, the weakened portion from the inner peripheral side of the skirt wall to the lower inner peripheral side of the skirt wall and from the inner peripheral side of the skirt wall A synthetic resin cap characterized in that dirt cleaning water intrusion prevention means for preventing dirt cleaning water from infiltrating from the inner peripheral side of the skirt wall is provided in the circumferential slit constituting the skirt.   The weakened portion includes a circumferential slit formed in a thin cylindrical portion through a step surface from a lower portion on the inner peripheral side surface of the lower end wall of the skirt wall, and the circumferential slit with an upper end depending from the step surface. And the bridge disposed in the circumferential direction with a predetermined pitch connected to the thin-walled cylindrical portion, and the dirt washing water intrusion prevention means is more radial than the bridge from the step surface of the skirt wall. 2. The synthetic resin cap according to claim 1, wherein the cap is made of an annular tongue formed to hang downward on the inside.   The annular tongue piece extends to a position below a position where the circumferential slit is formed, and is disposed so as to face the circumferential slit so as to cover at least the front surface of the opening on the inner surface side of the circumferential slit. The synthetic resin cap described.   A concave step surface extending outward from the inner peripheral surface in the axial direction is formed at the lower end of the inner peripheral surface of the skirt wall, and the tamper evidence band is provided on the outer peripheral surface side of the concave step surface via the weakening portion. The concave stepped surface is a dirt cleaning water infiltration preventing means for preventing the dirt cleaning water from entering the circumferential slit along the inner peripheral surface of the skirt wall. The synthetic resin cap according to claim 1.

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