JP5665337B2 - Plastic cap - Google Patents

Description

  The present invention relates to a synthetic resin cap, and more specifically, to a synthetic resin cap having a weakened portion that breaks when opened.

  Synthetic resin caps used for wide-mouthed jars such as milk candy require both of two opposing characteristics: high sealing performance at the time of sealing and high opening performance at the time of opening. Such a request is solved by, for example, providing a plurality of engaging projections on the cap and providing a recess having a thin portion so as to straddle the projection. (See Patent Document 1).

JP 2002-205750 A

  However, such a synthetic resin cap has a problem that the deformability (extension) of the concave portion is likely to vary among individual caps, and as a result, the opening strength of the cap may vary. .

  Therefore, an object of the present invention is to solve such a problem and to provide a synthetic resin cap having high hermeticity and good openability.

The present invention comprises a top wall and a skirt wall depending from the periphery of the top wall, and the skirt wall is provided with an opening saddle provided in a partial region of the outer peripheral surface and a lower portion of the inner peripheral surface. In the synthetic resin cap provided with the engaging projection provided, the skirt wall has a weakened portion that extends upward from the lower end and is formed to be fragile, and the weakened portion is used for the engagement when opened . The engagement protrusion is provided continuously in the circumferential direction so that stress is concentrated using the protrusion as a fulcrum, and the outer peripheral surface of the skirt wall is formed from the lower end toward the top wall and the outer peripheral surface. A synthetic resin cap characterized in that the concave portion is provided so as to straddle the engaging projection and the weakened portion is formed in the concave portion. .

  Further, the present invention is the synthetic resin cap characterized in that the connecting portion of the top wall portion and the skirt wall is formed in a curved shape, and the weakening line is provided up to the connecting portion.

  In the present invention, the weakened portion is a synthetic resin cap characterized in that the lower end side of the skirt wall is a groove portion having a V-shaped cross section formed deeper than the upper side.

  In addition, the present invention is a synthetic resin cap characterized in that the weakened portion is provided in one or a plurality of places.

  Further, the present invention is the synthetic resin cap characterized in that the weakened portion is provided on the side of the opening heel portion.

  In the synthetic resin cap of the present invention, the skirt wall has a weakened portion extending upward from the lower end, and the weakened portion is continuously provided in the circumferential direction with the engaging protrusion, thereby opening the skirt wall. Sometimes, the stress is concentrated using the engaging protrusion as a fulcrum, so that the weakened portion can be surely and easily broken, and good openability can be provided without causing variations in the opening strength.

  Since the weakened portion is provided in the recess, the weakened portion can be broken more easily and reliably.

  Since the weakened portion is provided up to the connecting portion formed in a phase shape, the weakened portion can be more easily and reliably broken.

  Moreover, the said weakening part can be provided in multiple places, and the said weakening part can be broken more easily and reliably by providing the said weakening part in the said opening collar part side of the said cap.

It is a side view of the synthetic resin cap of the present invention. It is a bottom view of the synthetic resin cap of the present invention. FIG. 3 is an enlarged view of a main part of FIG. 2. FIG. 2 is a perspective view of FIG. 1 when sealed. It is sectional drawing in the VV line | wire of FIG. FIG. 2 is a perspective view of FIG. 1 at the start of opening.

  An embodiment of the present invention will be described with reference to FIGS. The cap 1 made of synthetic resin is formed with a top wall 2 and a curved surface, and is composed of a skirt wall 3 that hangs downward from a connecting portion 9 continuous with the top wall 2. A recess 5 is cut out from the lower end of the part 4 and the skirt wall 3 toward the top wall 2. Accordingly, the portion of the skirt wall 3 where the concave portion 5 is formed is thinner than the other portions. Moreover, the recessed part 5 is intermittently provided in the circumferential direction of the outer peripheral surface 3a except the part of the opening collar part 4 over the perimeter.

  An engagement protrusion 6 is provided on the lower inner peripheral surface 3b of the skirt wall 3 so as to protrude in the inner peripheral direction. In the present embodiment, the engaging protrusion 6 is formed in a substantially elliptical shape, and intermittently so as to straddle the recessed portion 5 over the entire circumference except for the portion of the lower inner peripheral surface 3b that contacts the back side of the opening collar 4. Are arranged. Therefore, the engaging protrusion 6 has a portion that is provided on both ends thereof so as to overlap with the concave portion 5.

  The mouth portion 12 of the container 11 such as a milk candy is provided with a lip portion 12a, and the lip portion 12a is engaged and locked between the top wall 2 and the engaging projection 8 at the time of sealing. At this time, an inner ring 7 that seals the mouth portion 12 from the inside is erected on the inner surface of the top wall 2 of the cap 1, and the inner ring 7 is in pressure contact with the inner peripheral surface of the mouth portion 12 on the back side of the lip portion 12a. . Therefore, in the present embodiment, the container 11 is ensured to be sealed by the engagement protrusion 8 and the inner ring 7 when sealed.

  The recess 5 of the skirt wall 3 is provided with a weakened portion 8 extending from the lower end of the skirt wall 3 to the connecting portion 9 in the axial direction. Here, the weakened portion 8 is a thin layer that is torn and broken when the cap 1 is opened. For example, a groove portion having a V-shaped cross section is used as the weakened portion 8.

  In the present embodiment, it is important that the weakened portion 8 is provided so as to be continuous with the engaging projection 6 of the skirt wall 3 in the circumferential direction. That is, the weakened portion 8 formed from the surface of the concave portion 5 toward the inside of the cap is provided at a position continuous with the side end portion 6a of the engaging protrusion 6 provided intermittently. The side end portion 6a of the engaging projection 6 is provided so as to overlap the concave portion 5, but since the engaging projection 6 is thick, it has sufficient rigidity and is deformed by the force applied at the time of opening. It has become difficult.

  The weakened portion 8 may be formed from the inner surface of the skirt wall 3 toward the outer side of the cap, and may be directly continuous with the side end portion 6a of the engaging projection 6. Further, the upper end portion 8 a of the weakened portion 8 is provided so as to protrude in the height direction from the upper side portion 5 a of the concave portion 5.

  Further, the weakened portion 8 is configured such that the lower end side is more easily broken than the upper side, and the depth of the groove portion having a V-shaped cross section is provided so that the depth gradually increases from the upper end portion 8a to the lower end portion 8b. Further, the weakening portion 8 is provided in a region on the side of the opening collar 4 with respect to the midline M perpendicular to the symmetry axis S of the cap 1. In the present embodiment, the weakening portions 8 are provided at two locations, and are provided at positions farthest from the opening collar 4, that is, on the midline M.

  The weakening portion 8 may be a continuous groove portion as in the present embodiment, but may be a discontinuous groove portion such as a perforation. Further, the shape of the weakened portion 8 and the thickness of the skirt wall 3 where the weakened portion 8 is provided are appropriately set so that the cap 1 is not broken when the container 11 is struck and is torn and broken for the first time when opened. Designed.

  When the user applies force to the opening collar 4 to open the cap 1, the concave portion 5 first expands, and the opening collar 4 is more than the concave portion 5 provided with the weakened portion 8. The engagement of the side engaging projection 5 with the lip portion 12a is loosened. Thereafter, as shown in FIG. 6, the weakened portion 8 extends from the lower end portion 8 b using the side end portion 6 a of the engaging protrusion 6 and the weakened portion 8, which are the rigidity of the skirt wall 3, as a fulcrum. At this time, if the weakened portion 8 is formed in the concave portion 5, the weakened portion 8 is easily expanded. Further, since the weakened portion 8 is provided up to the connecting portion 9, and the upper end portion 8a reaches the connecting portion 9 which is difficult to be deformed by the force applied at the time of opening, the upper end portion 8a also serves as a fulcrum. The lower end portion 8b of the weakened portion 8 is fully extended and eventually starts to tear, and then the entire weakened portion 8 is broken. At this time, the weakened portion 8 is easily broken at the lower end portion, which is the cutting start portion, and the weakened portion 8 is easily broken. This breakage further loosens the engagement of the lip portion 12a. Further, when the user further applies force, the cap 1 is detached from the container 11 and opened.

At this time, if the weakened portion 8 is at a position further away from the opening collar 4, a greater stress is applied.
The engaging protrusion 6 can be used as a fulcrum to be hung on the weakened portion 8. However, if the weakened portion 8 is formed in the region opposite to the unsealing collar 4 with respect to the midline M, when the unsealing collar 4 is picked and opened, the engagement protrusion 6 is engaged with the lip 12a. Since it is very difficult to loosen, it is necessary to loosen this engagement and apply more stress until the weakened portion 8 starts to deform.

  Therefore, when the weakened portion 8 is provided at the position of the present embodiment, the engaging protrusion 6 provided in the region opposite to the opening collar 4 engages the lip portion 12a until the weakened portion 8 breaks. Therefore, since a relatively large force can be applied to the weakened portion 8 without moving, the weakened portion 8 can be easily and reliably torn and broken.

  The position of the weakened portion 8 can be changed as appropriate according to conditions such as the shape of the cap 1. For example, it can also be provided closer to the opening saddle 4 side. Moreover, the weakening part 8 does not need to be formed to the connection part 9, and the number of the weakening parts 8 may be single.

  The shape of the engagement protrusion 6 can be selected as appropriate. For example, a vertical surface may be provided to widen the portion serving as the fulcrum of the weakened portion 8.

DESCRIPTION OF SYMBOLS 1 Cap 2 Top wall 3 Skirt wall 3a Outer peripheral surface 3b Lower inner peripheral surface 4 Unlocking flange part 5 Recessed part 5a Upper side part 6 Engaging protrusion 6a Side edge part 6b Vertical part 7 Inner ring 8 Weakening part 8a Upper end part 8b Lower end part 9 Connecting part 11 Container 12 Mouth
12a Lip part

Claims (5)

The skirt wall comprises a top wall and a skirt wall suspended from the periphery of the top wall. In a synthetic resin cap with a combination protrusion,
Wherein the skirt wall has a weakened portion which is breakable formed extends upward from the lower end, weakening portions and the engagement the engaging projection as stress concentrates the engagement protrusion as a fulcrum upon opening Provided continuously in the circumferential direction,
The outer peripheral surface of the skirt wall has a concave portion that is formed from the lower end toward the top wall and is formed by cutting out the outer peripheral surface, and the concave portion is disposed so as to straddle the engaging protrusion. A synthetic resin cap characterized in that the weakened portion is formed in the concave portion. Said connecting portion of said skirt wall and the top wall portion is formed in a curved surface, the synthetic resin cap according to claim 1, wherein said weakened portion is characterized in that it is provided to the connecting portion. 3. The synthetic resin cap according to claim 1, wherein the weakened portion is a groove portion having a V-shaped cross section in which a lower end side of the skirt wall is formed deeper than an upper side. The synthetic resin cap according to claim 1, 2 or 3 , wherein the weakened portion is provided in one or a plurality of places. The synthetic resin cap according to claim 1, 2, 3, or 4 , wherein the weakening portion is provided on the side of the opening collar.

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