JP6290612B2 - Plastic cap - Google Patents

Description

  The present invention relates to a synthetic resin cap, and more particularly to a synthetic resin cap with improved opening of a planned opening portion.

  2. Description of the Related Art Conventionally, there is a synthetic resin cap that is formed so as to be opened by an opening means such as a pull ring, and in which a planned opening portion defined by a score is formed. In such a synthetic resin cap, if the shape of the planned opening portion is a substantially circular shape that can increase the opening area in order to improve the flowability of the contents of the container, the planned opening portion is removed when opened. There is a tendency for the required force to increase.

  For this reason, it may be difficult for a weak child or an elderly person to open the bag. Therefore, in the conventional synthetic resin cap, an annular deformation restricting portion is provided at the periphery of the planned opening portion, the deformation of the planned opening portion is restricted, and stress concentration is effectively generated in the score to remove the planned opening portion. Synthetic resin caps with improved openability have been developed without reducing the force required to do this and reducing the flowability of the contents (see, for example, Patent Document 1).

Utility Model Registration No. 3119234

  However, in today's aging society, there is a demand for further reduction in the force required when removing the planned opening. Ideally, it would be best to eliminate the planned opening itself, but the planned opening not only keeps the container sealed, but the contents are synthesized when the synthetic resin cap is attached to the container mouth. Since it plays a role of preventing scattering in the resin cap, it is difficult to eliminate the planned opening portion itself.

  Then, an object of this invention is to provide the synthetic resin cap which improved the openability more, holding the opening plan part.

  The present invention includes a planned opening portion that is defined by a circular or elliptical score and has an opening means, and the opening opening portion has a reinforcing portion that is continuous with the opening means at the peripheral edge of the top surface. The reinforcing portion is a synthetic resin cap characterized by having a notch or a gap at a position on the opening means side.

The said notch part of this invention may be formed in the inner peripheral side of the said reinforcement part. In the present invention, the reinforcing portion may be annular, and the notch may be arcuate . Moreover, the said reinforcement part of this invention shall have further a notch part in the position on the opposite side to the said opening means, and this notch part may be made to form in the inner peripheral side of this reinforcement part. And the said reinforcement part of this invention may further have a clearance gap in the position on the opposite side to the said opening means.

  In the present invention, a reinforcing portion that is continuous with the opening means is provided in the planned opening portion, and a notch portion or a gap portion is provided at a position of the reinforcing portion on the opening means side. It is possible to further reduce the force when breaking the starting end. Furthermore, by providing a notch or a gap at a position on the opposite side of the opening means of the reinforcing portion, the force required for breaking the tear end of the score that requires the next force is further reduced. can do. Therefore, according to the present invention, it is possible to further improve the unsealing property while holding the planned opening portion.

It is a top view which shows 1st Embodiment and Example 1 of this invention. It is sectional drawing in the II-II line of FIG. It is a top view which shows Example 2 of this invention. It is sectional drawing in the IV-IV line of FIG. It is a top view which shows 2nd Embodiment of this invention. It is sectional drawing in the VI-VI line of FIG. It is a top view which shows 3rd Embodiment of this invention. It is sectional drawing in the VIII-VIII line of FIG. It is a top view which shows the comparative example of this invention. It is sectional drawing in the XX line of FIG. It is a graph which shows the change of the opening intensity | strength with respect to the stroke of an Example and a comparative example.

  The inventor has found that the opening strength can be reduced in the same way as the conventional restriction regulation of the planned opening portion by making the portion that is initially pulled at the opening portion smaller when opening and encouraging the deformation of the score. The present invention has been achieved.

  A first embodiment of the present invention will be described with reference to FIGS. A synthetic resin cap 1 (hereinafter also referred to as a cap 1) includes an inner plug 2 and an upper lid 4 coupled to the inner plug 2 via a hinge portion 3.

  The upper lid 4 has a top wall 5 and a peripheral wall 6 that hangs down from the outer peripheral edge of the top wall 5. An inner ring 7 is formed on the inner surface of the top wall 5 so as to be in contact with the inside of the dispensing tube 12 of the inner plug 2 when the upper lid 4 is closed. One end side of the peripheral wall 6 is connected to the hinge portion 3, and a flange portion 8 is formed on the outer peripheral surface and an annular projection 9 is formed on the inner peripheral surface of the other end on the opposite side.

  The inner plug 2 has a top wall 10 and an outer cylinder 11 depending on the outer peripheral edge of the top wall 10. The inner peripheral edge of the top wall 10 is continuous with the dispensing cylinder 12. An engaging cylinder 13 is erected from the top surface of the top wall 10. Further, a planned opening portion 15 defined by an annular score 14 is provided inward of the dispensing tube 12 of the inner plug 2. The engagement cylinder 13 is formed to engage with the annular protrusion 9 when the upper lid 4 is closed and to maintain the closed state. In the present embodiment, the score 14 is formed in a substantially circular shape or a substantially elliptical shape.

  The pouring cylinder 12 constitutes a flow path for pouring the contents of a container (not shown) to which the cap 1 is attached, and is continuous with the top wall 10 at a substantially central portion thereof. . The outer peripheral surface of the lower end of the dispensing cylinder 12 forms a fitting groove in which the container is fitted together with the outer cylinder 11 and the top wall 10.

  The planned opening portion 15 is provided with a pull top 16 as an example of opening means on the hinge portion 3 side, and an annular reinforcing portion 17 is provided on the top surface of the peripheral portion 15a along the peripheral portion 15a. Projected. That is, the peripheral edge portion 15a of the planned opening portion 15 is formed to be thicker than other portions. The pull top 16 includes a ring portion 16a that can be hooked with a finger, and a column portion 16b that connects the ring portion 16a and the planned opening portion 15. The planned opening portion 15 may have a flat plate shape as in the present embodiment, but other shapes such as a mortar shape may be employed.

  The reinforcing portion 17 is provided so as to be continuous with the column portion 16 b of the pull top 16. Further, a first notch 18 is formed on the inner peripheral side of the reinforcing portion 17 on the column portion 16b side. And the 2nd notch part 19 is formed in the inner peripheral side on the opposite side to the pillar part 16b of the reinforcement part 17. As shown in FIG. That is, the reinforcing portion 17 is formed such that the cut start end 14a side and the cut end end 14b side of the score 14 are narrow in the radial direction. In the present embodiment, the first cutout portion 18 and the second cutout portion 19 are formed in a fan shape so that the corner portions 18a and 19a are formed, except that they are continuous with the column portion 10 or not. It is formed in substantially the same shape.

  Next, examples of the present invention will be described. In addition, since structures other than the structure described below are the same as those in the above embodiment, the description thereof is omitted.

  (1) In Example 1 (see FIGS. 1 and 2), the first notch having a length of about 15% of the circumferential length is provided on each of the column part 16b side and the opposite side of the pull ring 17 of the reinforcing part 17 A portion 18A and a second cutout portion 19A are provided.

  (2) In Example 2 (see FIGS. 3 and 4), the first notch having a length of about 6% of the circumferential length is provided on each of the column part 16b side of the pull ring 17 and the opposite side of the reinforcing part 17 A portion 18B and a second notch portion 19B are provided.

  (3) In the comparative example (see FIGS. 9 and 10), an annular deformation restricting portion 22 is provided on the peripheral edge portion 15 a of the planned opening portion 15.

FIG. 11 shows the results of performing an unsealing test using Examples 1 and 2 and a comparative example using an autograph. The horizontal axis indicates the stroke of the autograph, and the vertical axis indicates the load at that time, that is, the change in the opening strength. Primary peaks FP _E1 , FP _E2 and FP _C indicate the unsealing strength when the cut start end 14a of the scores 14 of Examples 1 and 2 and the comparative example is broken. The secondary peaks SP _E1 , SP _E2 and SP _C indicate the opening strength when the tearing end 14b of the scores 14 of Examples 1 and 2 and the comparative example is broken and the planned opening 15 is completely separated from the inner plug 2. Show.

As a result of the opening test, the primary peak was FP _E1 ≈FP _E2 <FP _C. This result shows that both of Examples 1 and 2 can reduce the unsealing strength as compared with the comparative example in which the deformation restricting portion 22 is provided. That is, in order to reduce the opening strength of the tear start edge 14a of the score 14, it is useful to make the strength of the peripheral edge portion 15a of the planned opening portion 15 smaller than the other peripheral edge portions 15a on the side of the tear start edge 14a of the score 14. It shows that there is. In addition, it is particularly useful to provide a notch 18 having a length of at least about 6 to 15% of the circumference of the planned opening 15.

  This is because the strength of the peripheral edge portion 15a of the planned opening 15 is smaller than that of the other peripheral edge portion 15a on the cut start end 14a side of the score 14, so that the first pull-up portion is pulled when the pull top 16 is pulled up. Can be reduced. Accordingly, it is presumed that the deformation of the score 14 was promoted and a stress concentration point was formed.

The secondary peak was SP _E1 <SP _E2 <SP _C. As a result, in order to reduce the opening strength of the tear end 14b of the score 14, the strength of the peripheral portion 15a of the planned opening portion 15 on the side of the tear end 14b of the score 14 is made smaller than the other peripheral portions 15a. It is useful. In particular, it is particularly useful to form the notch 19 with a length of at least about 6 to 15% of the circumference of the planned opening 15.

  This is because the strength of the peripheral edge portion 15a of the planned opening portion 15 is smaller than that of the other peripheral edge portion 15a on the side of the cut end edge 14b of the score 14, so that the reinforcing portion It is estimated that it is because it can reduce or prevent that 17 becomes resistance.

  Therefore, by forming the notch portion 18 or the gap portion 20 on the pull top 16 side (the tear start end 14a side) of the reinforcing portion 17, it is possible to reduce the opening strength when the tear start end 14a that requires the most force is broken. Is possible. Further, by forming the notch 19 or the gap 21 on the side opposite to the pull top 16 (on the side of the tearing end 14b), the opening strength at the time of breaking the tearing end 14b that requires force is reduced. Is possible.

  Although the present invention has been described with reference to the above-described embodiments and examples, the present invention is not limited to the above-described embodiments and examples, and can be appropriately changed without departing from the scope of the invention. For example, as in the second embodiment of the present invention (see FIGS. 5 and 6), a first gap 20 and a second gap 21 are provided instead of the first notch 18 and the second notch 19, and the score 14 The strength of the peripheral edge portion 15a of the planned opening portion 15 may be smaller than that of the other peripheral edge portions 15a on the tear start end 14a side and the tear end end 14b side of the score 14.

  Further, as in the third embodiment of the present invention (see FIGS. 7 and 8), only the second notch 19 can be used as the gap 21. And it is applicable also to the screw cap with which the upper cover 2 is attached to the inside plug 3 by screwing. Furthermore, the present invention is also applicable to a synthetic resin cap in which a pouring tube is erected from the top surface of the top wall. At that time, an inner cylinder (not shown) may be suspended from the bottom surface of the top wall, and in that case, an opening planned portion is provided on the top wall (not shown) on the inner side of the extraction cylinder. Also good.

  In addition, the structure of the said embodiment and an Example can be combined suitably. For example, in combination with Example 1 (first embodiment) or Example 2 and Example 3 (third embodiment), the first notch 18 may be replaced with the first gap 20, or Example 2 and Example 2 may be implemented. In combination with Example 3, it is also possible to make the size of the notch portion different between the pull top 16 side and the opposite side. Further, the second cutout portion 19B of the second embodiment can be used as the gap portion 21.

DESCRIPTION OF SYMBOLS 1 Synthetic resin cap 2 Inner plug 3 Hinge part 4 Top cover 5 Top wall 6 Peripheral wall 7 Inner ring 8 Eaves part 9 Annular protrusion 10 Top wall 11 Outer cylinder 12 Extraction cylinder 13 Engagement cylinder 14 Score 14a Cutting start end 14b Ripping termination end 15 Opening scheduled portion 15a Peripheral portion 16 Pull top 16a Ring portion 16b Column portion 17 Reinforcement portion 17a Remaining portion 18 (first) notch portion 18a corner portion 19 second notch portion 19a corner portion 20 first gap portion 21 (second) gap portion 22 Deformation restriction part FP Primary peak SP Secondary peak

Claims (5)

Comprising a planned opening portion defined by a circular or oval score and having an opening means;
The planned opening portion has a reinforcing portion that is continuous with the opening means at the periphery of the top surface,
The synthetic resin cap, wherein the reinforcing portion has a notch or a gap at a position on the opening means side.   The synthetic resin cap, wherein the notch is formed on an inner peripheral side of the reinforcing portion. The reinforcing part is annular,
The synthetic resin cap according to claim 1, wherein the notch has an arc shape. The reinforcing portion further has a notch at a position opposite to the opening means,
The synthetic resin cap according to any one of claims 1 to 3, wherein the notch is formed on an inner peripheral side of the reinforcing portion.   The synthetic resin cap according to any one of claims 1 to 3, wherein the reinforcing portion further has a gap at a position opposite to the opening means.

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