JPWO2017061001A1 - Plastic cap - Google Patents

Abstract

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. The synthetic resin cap according to the present invention includes a skirt wall (3) provided with a female screw (5) screwed to a male screw (M1) formed on the outer periphery of the container mouth (M), and the skirt wall (3 ) And a tamper evidence band (9) connected to the lower part of the tamper evidence band (9) via an annular weakening portion (10), A plurality of locking pieces (11) that can be locked from below on an annular protrusion (M2) provided on the outer periphery of the portion (M) are provided at intervals in the circumferential direction, and at least some of the locking pieces (11 ) Is provided with a protrusion (14).

Description

  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 projection (locking jaw), the bridge (bridge) formed between the perforated slits that define the tamper evidence band and the skirt wall is broken, and the cap body and the tamper evidence The bands are separated from each other (see Patent Document 1). Therefore, it is possible to easily confirm whether or not the opening operation has been performed by visually confirming whether or not the bridge constituting the annular weakened portion is broken.

JP 2010-195455 A

  By the way, in the conventional weight reduction cap, weight reduction is achieved by thinning a 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 comprises a skirt wall provided with a female screw that engages with 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 via a hook, and a locking piece that can be locked from below on an annular protrusion provided on the outer periphery of the container mouth on the inner peripheral side of the tamper-evidence band Are provided at intervals in the circumferential direction, and at least some of the locking pieces are provided with protrusions (claim 1).

  The said synthetic resin cap WHEREIN: The said protrusion part may protrude ahead from the front-end | tip of the said locking piece (Claim 2).

  In the synthetic resin cap, the protruding portion may be configured to be thinner than the locking piece.

  The said synthetic resin cap WHEREIN: The said protrusion part may be provided in the lower surface of the said locking piece (Claim 4).

  The said synthetic resin cap WHEREIN: The said protrusion part may be provided in the center in the left-right width direction of the said locking piece (Claim 5).

  In the synthetic resin cap, the end portions of the adjacent locking pieces may be connected to each other (Claim 6).

  According to the present invention, a synthetic resin cap is obtained that can sufficiently keep the locking force to the annular projection of the container mouth while reducing the weight.

  In other words, if the locking piece that protrudes upward is greatly collapsed during opening, the locking piece pressed by the annular protrusion of the container mouth portion is likely to be re-inverted and protrude downward. The stop piece does not lock well with the annular protrusion. However, in the synthetic resin cap of the invention according to each claim of the present application, the locking piece is provided with a protruding portion, and the locking piece that protrudes upward is greatly collapsed. This is prevented by the abutment of the protruding portion with respect to the outer peripheral surface, whereby the locking piece is locked to the annular protrusion satisfactorily.

  In the synthetic resin cap according to the second and third aspects of the invention, since the protruding portion is in contact with the outer peripheral surface of the annular protrusion, the engaging piece does not fall down when opened, The locking is very powerful.

  In the synthetic resin cap of the invention according to claim 4, since the strength of the locking piece is improved by the rib effect by the convex portion provided on the lower surface of the locking piece, the entire locking piece is made thin and lightweight. It becomes easy to achieve.

  In the synthetic resin cap according to the sixth aspect of the present invention, it is more certain that the locking pieces that protrude upward will be greatly collapsed at the time of opening by connecting the tips of adjacent locking pieces. As a result, the locking piece is locked to the annular protrusion very well.

(A) And (B) is the top view and bottom view which show schematically the structure of the synthetic resin caps which concern on one embodiment of this invention. It is a principal part expansion longitudinal cross-sectional end view which shows roughly the structure of the said synthetic resin cap before the mounting to a container opening part. It is a longitudinal cross-sectional view which shows the structure of the said synthetic resin cap roughly. It is a semi-longitudinal cross-sectional view (figure which shows the left half of the vertical cross section which becomes substantially left-right symmetric) which shows schematically the structure of the said synthetic resin cap in the state with which the container mouth part of the crystallization bottle was mounted | worn. It is a semi-longitudinal sectional view (figure which shows the left half of the longitudinal section used as a substantially right-and-left symmetry) which shows roughly composition of the above-mentioned synthetic resin cap in the state where it was equipped in the container mouth part of an amorphous bottle. It is a perspective view which shows schematically the structure of the modification of the said synthetic resin caps. It is a longitudinal cross-sectional view which shows schematically the structure of the modification of the said synthetic resin caps. It is a partial expanded vertical end view which shows schematically the structure of the modification of the said synthetic resin caps. It is a partial expanded vertical end view which shows schematically the structure of the further modification of the said synthetic resin caps.

  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 to 3 is used by being attached to a mouth M (see FIG. 4) of a container such as a plastic bottle, for example, and compression molding or injection. By molding, it is molded integrally with polyethylene. 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 to 4, the cap 1 includes a substantially circular top wall 2 and a substantially cylindrical skirt wall 3 extending downward from the outer peripheral portion of the top wall 2 in plan view. 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 can be coupled to a male screw M1 formed on the outer periphery of the container mouth.

  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 brought into close contact with the container mouth M, whereby the container mouth M is sealed (see FIG. 4). That is, as shown in FIG. 4, in a state where the cap 1 is attached to the container mouth portion M, the middle foot 6 is inserted into the container mouth portion M and is in close contact with the inner peripheral surface of the container mouth portion M. 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. Are formed with slits (perforated) extending intermittently in the circumferential direction of the skirt wall 3 and the band 9 and a bridge existing between adjacent slits. Breaks when pulled by 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 (FIG. 1B and (See FIG. 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 protrusion M2 by an opening operation (see FIG. 4). That is, the locking piece 11 is configured to be locked to the annular protrusion M2 from below, and when opened, the skirt wall 3 and the top wall 2 above the annular weakening portion 10 are detached from the container mouth M, The band 9 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 formed integrally with 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. When the cap 1 is attached to M, the cap 1 is pushed up by the annular projection M2 and reversed, and as shown in FIGS. 3 and 4, it protrudes upward.

  In this embodiment, as shown in FIGS. 1B and 3, at least a part of the lower surface of the locking piece 11 protrudes downward in the center in the left-right width direction (circumferential direction of the band 9). A convex portion (an example of a protruding portion) 12 is provided. In the illustrated example, the locking pieces 11 provided with the protrusions 12 and the locking pieces 11 not provided are alternately arranged in the circumferential direction of the band 9.

  Here, when the locking piece 11 projecting upward is greatly collapsed at the time of opening, the locking piece 11 pressed by the annular protrusion M2 is easily re-inverted and protrudes downward. 11 does not lock well with the annular protrusion M2. However, in the present embodiment, the convex portion 12 is provided on the lower surface of the locking piece 11, and the fact that the locking piece 11 protruding upward greatly falls (falls down) means that the outer peripheral surface of the container mouth portion M. This is prevented by the abutment of the convex portion 12 with respect to (the portion M3 positioned immediately below the annular protrusion M2), whereby the engagement of the engagement piece 11 with the annular protrusion M2 is favorably performed.

  This effect is particularly useful when the cap 1 is used for an amorphous bottle in which the container mouth M is in a non-crystallized state, rather than a crystallization bottle in which the container mouth M is crystallized. It becomes. This is because, in the container mouth M of the crystallization bottle, as shown in FIG. 4, the outer diameter of the portion M3 immediately below the annular protrusion M2 is relatively large, so that the locking piece 11 is not easily collapsed. This is because, in the container mouth portion M of the amorphous bottle, as shown in FIG. 5, the outer diameter of the portion M3 immediately below the annular protrusion M2 is relatively small, so that the locking piece 11 is easily tilted.

  In addition, when the convex portion 12 is provided on the lower surface of the locking piece 11, the strength of the locking piece 11 is improved by the rib effect by the convex portion 12, so that the entire locking piece 11 is thinned and lightened. It is also easy to plan.

  The thickness of the locking piece 11 and the thickness of the convex portion 12 may be determined in consideration of the dimensions of the container mouth portion M, etc. In this embodiment, the thickness of the distal end portion of the locking piece 11 including the convex portion 12 is It is 1.0-2.0 mm (for example, 1.2 mm), and the thickness of only the convex part 12 is 0.3-0.6 mm (for example, 0.5 mm).

  Further, in this embodiment, as shown in FIGS. 1B and 3, the front end portions of the adjacent locking pieces 11 are connected by the connecting portion 13, and all the locking pieces 11 are connected in a ring shape. . And also by this structure, it is prevented that the latching piece 11 which protrudes upwards greatly falls at the time of opening, As a result, latching of the latching piece 11 with respect to the cyclic | annular protrusion M2 is performed very favorably. It will be.

  In addition, this invention is not limited to said embodiment at all, Of course, it can change and implement variously in the range which does not deviate from the summary of this invention. For example, the following modifications can be given.

  In the example shown in FIG. 1B and FIG. 3, the locking pieces 11 provided with the convex portions 12 and the locking pieces 11 not provided are alternately arranged in the circumferential direction of the band 9. The group consisting of one or more locking pieces 11 provided with the convex portions 12 and the group consisting of one or more locking pieces 11 not provided with the convex portions 12 are alternately arranged in the circumferential direction of the band 9. In addition, the locking pieces 11 constituting each group may be arranged in the circumferential direction of the band 9. In this case, the number of the locking pieces 11 constituting each group can be arbitrarily set. In other words, for example, one locking piece 11 provided with the convex portion 12 and two locking pieces 11 not provided with the convex portion 12 may be alternately arranged in the circumferential direction of the band 9. In this case, the number of the locking pieces provided with the convex portions 12 can be other than one, and the number of the locking pieces 11 not provided with the convex portions 12 can be other than two. Moreover, you may provide the convex part 12 in all the locking pieces 11. FIG.

  In the example shown in FIG. 1B and FIG. 2, the convex portion 12 is provided from the tip of the lower surface of the locking piece 11 to the base end, but not limited to this, for example, the convex portion 12 is the tip of the locking piece 11. You may make it provide only in the lower surface of a part. Further, in the example shown in FIG. 1B and FIG. 3, the convex portion 12 is provided at the center in the left and right width direction of the locking piece 11. It may be provided at a position that is biased to one of them, or a single locking piece 11 may be provided instead of a single one.

  In the example shown in FIG. 1 (B) and FIG. 3, the end portions of the adjacent locking pieces 11 are connected to each other by the connecting portion 13, and all the locking pieces 11 are connected in an annular shape. Only some of the locking pieces 11 may be connected by the connecting portion 13.

  In the example shown in FIGS. 1 to 4, in the cap 1 attached to the container mouth portion M, the annular protrusion M <b> 2 is used as a protruding portion that comes into contact with the outer peripheral surface of the container mouth portion M and prevents the locking piece 11 from falling down. Although the convex part 12 which contact | abuts the part M3 immediately under is provided, the protrusion part is not restricted to what is provided in the lower surface of the latching piece 11 like this convex part 12. FIG. That is, for example, as shown in FIGS. 6 to 8, a claw portion 14 that protrudes forward from the tip of the locking piece 11 and abuts on the outer peripheral surface of the annular protrusion M <b> 2 may be provided as the protruding portion.

  Specifically, as shown in FIG. 6, the claw portion 14 is provided at the center in the left-right width direction of the locking piece 11, and as shown in FIGS. 7 and 8, the locking piece 11 and the claw portion 14 It is configured to be thinner than the tip of the locking piece 11 so that a step portion 15 to which the annular projection M2 is locked is formed at the boundary. In other words, by stealing the meat on the lower surface side (the side that becomes the inner peripheral surface when the locking piece 11 protrudes upward and faces the annular protrusion M2), The wall thickness is made thinner than the wall thickness at the tip of the locking piece 11.

  Here, the length of the nail | claw part 14 (length extended from the latching piece 11) is 1.0-2.0 mm. In addition, in the illustrated example, considering that the claw portion 14 is too thick, the step portion 15 is narrowed and the annular protrusion M2 is liable to be locked, and if the claw portion 14 is too thin, the step is easily broken. While the thickness of the locking piece 11 is 0.7 mm, the thickness of the claw portion 14 is 0.1 to 0.4 mm (preferably 0.2 mm).

  If the claw portion 14 is provided in this way, it is possible to prevent the locking piece 11 protruding upward from falling down when the claw portion 14 is opened by the contact of the claw portion 14 with the outer peripheral surface of the annular protrusion M2. The locking piece 11 is locked to the annular protrusion M2 very strongly.

  Here, in the example shown in FIG. 6, the claw portions 14 are provided in each locking piece 11. For example, when there are 8 (even number) locking pieces 11, the locking pieces provided with the claw portions 14. 11 and the locking pieces 11 that are not provided may be arranged alternately in the circumferential direction of the band 9, and thus, the number and arrangement of the claw portions 14 are varied similarly to the convex portions 12. be able to.

  In the example shown in FIG. 6, the claw portion 14 is provided at the center in the left and right width direction of the locking piece 11, but not limited to this, the position is biased to either the left or right of the locking piece 11. May be provided on one locking piece 11 instead of a single one, and when one claw portion 14 is provided on one locking piece 11, the claw portion 14 may be provided. May be the same width as the locking piece 11 or wider than the locking piece 11.

  Further, in the examples shown in FIGS. 7 and 8, the claw portion 14 is made thinner than the tip of the locking piece 11. However, the thickness of the claw portion 14 is not limited to this, and the thickness of the tip of the locking piece 11 is not limited thereto. Further, the thickness of the claw portion 14 may be substantially constant from the proximal end to the distal end, or may be configured to become thinner toward the distal end, for example. And in this case, you may make it provide the ditch | groove which the front-end | tip of the cyclic | annular protrusion M2 fits instead of the step part 15, for example.

  6 to 8, when the claw portion 14 is provided on the locking piece 11, as shown in FIG. 9, the locking piece 11 or the upper surface side of the claw portion 14 (the locking piece 11 protrudes upward). The protruding portion 16 may be provided on the outer peripheral surface side). In this case, the contact of the protruding portion 16 with the inner peripheral surface of the band 9 restricts the locking piece 11 from excessively warping upward, so that the locking piece 11 is excessively warped upward and is annular with respect to the step portion 15. The locking of the protrusion M2 is released, and the band 9 can be reliably prevented from slipping out above the annular protrusion M2. In this case, if the protruding portion 16 is provided at the base portion of the claw portion 14, the thin-walled claw portion 14 can be hardly broken.

  You may make it provide both the convex part 12 and the nail | claw part 14 as a protrusion part with respect to the one locking piece 11. FIG. In this case, by providing the convex portion 12 so as to extend to the tip of the locking piece 11, the annular protrusion M <b> 2 is also locked to the convex portion 12. Locking will be performed better.

  Needless to say, the above modifications may be combined as appropriate.

DESCRIPTION OF SYMBOLS 1 Cap 2 Top wall 3 Skirt wall 4 Knurled groove 5 Female screw 6 Middle foot 7 Annular rib 8 Outer foot 9 Tamper evidence band 10 Annular weakening part 11 Locking piece 12 Convex part 13 Connection part 14 Claw part 15 Step part 16 Protrusion part M Container mouth M1 Male thread M2 Annular protrusion M3 The part directly below the annular protrusion

Claims (6)

A cap provided with a skirt wall provided with an internal thread that engages with an external thread formed on the outer periphery of the container mouth portion, and a tamper evidence band connected to the lower portion of the skirt wall via an annular weakening portion,
On the inner peripheral side of the tamper evidence band, a plurality of locking pieces that can be locked from below on annular projections provided on the outer periphery of the container mouth portion are provided at intervals in the circumferential direction,
A synthetic resin cap characterized in that at least a part of the locking piece has a protrusion.   The synthetic resin cap according to claim 1, wherein the protruding portion protrudes forward from a tip of the locking piece.   The synthetic resin cap according to claim 2, wherein the protruding portion is configured to be thinner than the locking piece.   The synthetic resin cap according to claim 1, wherein the protrusion is provided on a lower surface of the locking piece.   The said protrusion part is a synthetic resin cap as described in any one of Claims 1-4 provided in the center in the left-right width direction of the said locking piece.   The synthetic resin cap according to any one of claims 1 to 5, wherein tips of adjacent locking pieces are connected to each other.