Cap and method for manufacturing the same

Abstract

To provide a cap and manufacturing method therefor, capable of achieving high resistance to liquid shortage.SOLUTION: A cap 1 includes a lid body 2 fitted onto a container B and a top lid 3 detachable to the lid body 2. The lid body 2 has a pour-out tube 14 and the pour-out tube 14 has a front end part 20 folded to the outer-peripheral side. The top lid 3 has an outer-peripheral protrusion 31 abutted onto the front end part 20 of the pour-out tube 14 from the outer periphery when fitted onto the lid body 2. The front end part 20 of the pour-out tube 14 has thinner groove part 25 than an adjacent part at the inside of the folded part. The groove part 25 is a bent part formed as the result of the outer-peripheral protrusion 31 abutting onto the front end part 20 of the pour-out tube 14 from the outer-periphery.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a cap and a method for manufacturing the cap. [Background technology]

[0002] Among the components that make up the cap, the lid body that is attached to the container is provided with a pouring tube that pours out the liquid stored in the container. Generally, the performance of the pouring tube to cut off the liquid when pouring is finished, that is, liquid cut-off performance, is important for the pouring tube. If the liquid cut-off performance is poor, liquid is likely to remain in the pouring tube, and the remaining liquid will fall from the pouring tube and soil the surrounding area.

[0003] As a cap with improved liquid drainage, the invention described in Patent Document 1 has been proposed. As shown in Fig. 1 of Patent Document 1, in the cap 1 described in Patent Document 1, the spout part 24 of the spout part 22 (the tip part of the pouring tube) extends downward in order to improve liquid drainage. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-186024 A Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, the cap 1 described in Patent Document 1 has a narrow gap between the spout 24 and the pouring barrel 21, and a smoothly curved shape at the flange 23. For this reason, it is difficult to mold a cap 1 of this shape by injection molding, and in actual injection molding, the cap 1 is molded into a shape in which the gap between the spout 24 and the pouring barrel 21 is wide. Even if the gap between the spout 24 and the pouring barrel 21 is narrowed, the gap will widen over time.

[0006] In this way, if the distance between the spout portion 24 and the pouring barrel 21 is increased, the spout portion 24 (tip) will widen relative to the axis of the pouring portion 20 (pour tube), which creates the problem that liquid drainage is not adequately ensured.

[0007] Therefore, an object of the present invention is to provide a cap that can improve liquid drainage and a method for manufacturing the cap. [Means for solving the problem]

[0008] In order to solve the above problems, a cap according to a first aspect of the present invention includes a lid body that is attached to a container; The lid body is provided with a detachable upper lid, The lid body is provided on the outer periphery. The turnaround a pouring tube having a tip portion formed thereon, The upper lid has an outer peripheral protrusion that contacts the tip of the pouring tube from the outer periphery when the upper lid is attached to the lid body, The tip of the pouring tube has a groove portion on the inside of the fold that is thinner than an adjacent portion, The groove portion is a portion that is bent when the outer peripheral protrusion abuts against the tip portion of the pouring cylinder from the outer periphery.

[0009] A cap according to a second aspect of the present invention is the cap according to the first aspect of the present invention, wherein the groove is formed in an angular shape.

[0010] Furthermore, the cap of the third invention is a cap of the first or second invention, in which the upper cover has an inner protrusion that abuts against the tip of the pouring tube from the inner circumference when the upper cover is attached to the lid body.

[0011] In addition, the cap according to the fourth invention is the cap according to the third invention, in which the inner peripheral protrusion and the outer peripheral protrusion each abut against the tip of the pouring cylinder over their entire circumference.

[0012] In addition, the cap of the fifth invention is a cap of any one of the first to fourth inventions, in which the area from the tip of the pouring tube to the tip of the pouring tube is greater than the area of ​​the part abutting the outer peripheral protrusion on the outside of the fold.

[0013] A sixth aspect of the present invention is a method for producing a cap according to any one of the first to fifth aspects of the present invention, an injection molding process for molding a lid body and a top lid from synthetic resin by injection molding; and a mounting step of mounting the upper lid on the lid body at a temperature at which the tip of the pouring tube is plastically deformed. Effect of the Invention

[0014] According to the cap and the method for manufacturing the cap, the tip of the pouring tube is bent at the groove, and the tip does not expand relative to the axis of the pouring tube, thereby improving liquid drainage. [Brief description of the drawings]

[0015] [Figure 1] 1 is a vertical cross-sectional view showing a state in which a top lid of a cap according to an embodiment of the present invention is open. [Diagram 2] FIG. 2 is a vertical cross-sectional view showing only the left side of the cap in a state in which the top lid of the cap is beginning to be closed. [Diagram 3] 3 is a vertical cross-sectional view showing only the left side of the cap with the top cover shown in FIG. 2 further closed. FIG. [Figure 4] FIG. 2 is a vertical cross-sectional view showing only the left side of the cap with the top lid closed. [Diagram 5] 5 is an enlarged vertical cross-sectional view showing the periphery of a tip portion of a pouring tube in a lid body of the cap shown in FIG. 4. [Figure 6] 2 is an enlarged vertical cross-sectional view showing the periphery of a tip portion of a pouring tube in a lid body of the cap shown in FIG. 1. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, a cap according to an embodiment of the present invention and a method for manufacturing the cap will be described with reference to the drawings. Note that, although the cap is a hinge-type cap as an example, the cap is not limited to the hinge-type.

[0017] First, the cap will be described, and then a method for manufacturing the cap will be described.

[0018] As shown in FIG. 1, the cap 1 includes a lid body 2 attached to the mouth m of the container B, and an upper lid 3 that can be attached and detached to the lid body 2. The lid body 2 is attached to the mouth m of the container B, and therefore includes, for example, a base portion 10, an outer tube portion 11 connected to the base portion 10 and in contact with the mouth m of the container B from the outer periphery, and an inner tube portion 12 connected to the base portion 10 and in contact with the mouth m of the container B from the inner periphery. That is, the base portion 10, the outer tube portion 11, and the inner tube portion 12 of the lid body 2 are configured to sandwich the mouth m of the container B. The lid body 2 includes, for example, an engagement portion 13 that engages with the upper lid 3 over the entire circumference, since the upper lid 3 is attached. On the other hand, the upper lid 3 includes an engaged portion 30 that engages with the engagement portion 13. The cap 1 is, for example, a hinge type, and therefore also includes a hinge 4 that connects the lid body 2 and the upper lid 3.

[0019] The lid body 2 has a pouring tube 14, and the upper lid 3 has an outer peripheral protrusion 31. The pouring tube 14 of the lid body 2 is a cylindrical body that pours out the liquid L stored in the container B, and is provided, for example, on the base part 10. For this reason, the inside of the pouring tube 14 has, for example, an annular groove 15 formed on the base part 10 and a pull ring 16 connected to the part surrounded by the annular groove 15 in order to form an outlet through which the liquid L passes. That is, the part surrounded by the annular groove 15 in the base part 10 is removed by pulling up the pull ring 16 to become the outlet. Of course, the inside of the pouring tube 14 may be configured to form an outlet in another manner without having the annular groove 15 and the pull ring 16, or the outlet may be formed from the beginning. In any case, the performance of cutting off the liquid L at the end of pouring, that is, the liquid cutting ability, becomes important for the pouring tube 14. In order to ensure this liquid drainage, the tip 20 of the pouring tube 14 is folded back toward the outer periphery. On the other hand, the outer peripheral protrusion 31 of the upper lid 3 is a member that comes into contact with the tip 20 of the pouring tube 14 from the outer periphery when the upper lid 3 is attached to the lid body 2.

[0020] As shown in Fig. 2, the tip 20 of the pouring tube 14 has a groove 25 on the inside of the fold that is thinner than the adjacent portion. As shown in Fig. 3 and Fig. 4, the groove 25 is a portion that is bent when an outer peripheral protrusion 31 abuts against the tip 20 of the pouring tube 14 from the outer periphery.

[0021] A preferred embodiment of the cap 1 will now be described.

[0022] 4, the upper lid 3 has an inner peripheral protrusion 32 that abuts from the inner periphery against the tip 20 of the dispensing tube 14 when the upper lid 3 is attached to the lid body 2. As a result, the dispensing tube 14 is doubly sealed by the inner peripheral protrusion 32 and the outer peripheral protrusion 31 when the upper lid 3 is attached to the lid body 2.

[0023] The inner peripheral protrusion 32 and the outer peripheral protrusion 31 each abut against the tip 20 of the pouring tube 14 over the entire circumference. That is, when the upper lid 3 is attached to the lid body 2, the inner peripheral protrusion 32 abuts against the tip 20 of the pouring tube 14 from the inner circumference over the entire circumference, and the outer peripheral protrusion 31 abuts against the tip 20 of the pouring tube 14 from the outer circumference over the entire circumference. As a result, when the upper lid 3 is attached to the lid body 2, the pouring tube 14 is sealed over the entire circumference.

[0024] 5, the tip 20 of the pouring tube 14 is made larger in area from the part t that abuts against the outer peripheral protrusion 31 to the tip 21 of the pouring tube 14 (part n that does not abut) on the outside of the fold than the area of ​​the part t. That is, when the upper lid 3 is attached to the lid body 2, the area of ​​the part t where the outer peripheral protrusion 31 abuts against the tip 20 of the pouring tube 14 is relatively small. This prevents the tip 20 of the pouring tube 14 from being pulled by the moving outer peripheral protrusion 31 and deforming when the attachment is released (the upper lid 3 is opened).

[0025] Next, the tip portion 20 of the pouring tube 14 will be described in detail.

[0026] As shown in FIG. 6, the tip 20 of the pouring tube 14 before contacting the outer peripheral protrusion 31 and the inner peripheral protrusion 32 has an expanded diameter portion 23 that expands to the outer periphery, and a protruding portion 24 that protrudes further outward from the expanded diameter portion 23. This protruding portion 24 has the tip 21 of the pouring tube 14 described above. The upward facing surfaces of the expanded diameter portion 23 and the protruding portion 24 are the outer side of the turn-up described above, and the downward facing surfaces of the expanded diameter portion 23 and the protruding portion 24 are the inner side of the turn-up described above. The groove portion 25 is formed near the boundary between the expanded diameter portion 23 and the protruding portion 24. The groove portion 25 is thinner than the adjacent portions (i.e., both the expanded diameter portion 23 side and the protruding portion 24 side). The protruding portion 24 is formed such that the angle α between the upper surface and the axis of the pouring tube 14 (axis A parallel to the axis) is 55 to 75°, and the angle β between the lower surface and the axis of the pouring tube 14 (axis A parallel to the axis) is 80 to 100°. With such a protruding portion 24, it becomes easy to mold the lid main body 2 by injection molding (specifically, the work of demolding).

[0027] As shown in FIG. 5, when the upper lid 3 is attached to the lid body 2, the expanded diameter portion 23 does not change its posture significantly from the state shown in FIG. 6, but the protruding portion 24 changes its posture significantly from the state shown in FIG. 6. The reason why the portion in which the posture does not change significantly and the portion in which the posture changes significantly occur is because the portion between these two portions is bent. The valley side of this bending is formed in the groove portion 25. As shown in FIG. 5, in the protruding portion 24 in the state in which the groove portion 25 is bent, the upper surface (external surface to be exact) and the axis of the pouring tube 14 (axis A parallel to the axis) are approximately parallel (including ±10° from parallel), and the angle β between the lower surface (inner surface to be exact) and the axis of the pouring tube 14 (axis A parallel to the axis) is 15 to 35°. In this way, the protruding portion 24 becomes nearly parallel to the axis of the pouring tube 14 by bending the groove portion 25, thereby improving the liquid cut-off property.

[0028] As shown in Fig. 6, in order to promote the bending, the groove 25 has a portion 26 formed in an angular shape. This angular shape is not limited to a strict angular shape, and includes manufacturing errors. As long as the groove 25 has the portion 26 formed in an angular shape, the bending can be promoted even if the groove 25 has a portion other than the portion 26 that is curved. If the angle of the angular portion 26 of the groove 25 is 80 to 100°, the bending is appropriately promoted.

[0029] The function of the cap 1 will now be described.

[0030] As shown in FIG. 1, the top lid 3 is not attached to the lid body 2 (top lid 3 is open), and then, as shown in FIG. 2, the top lid 3 is attached to the lid body 2 (top lid 3 is closed).

[0031] Then, as shown in Fig. 3, when the outer peripheral protrusion 31 comes into contact with the tip 20 of the pouring tube 14, the groove 25 bends. After that, when the top lid 3 is attached to the lid body 2 as shown in Fig. 4, the tip 20 of the pouring tube 14 is doubly sealed all around by the inner peripheral protrusion 32 and the outer peripheral protrusion 31. At this time, as shown in Fig. 5, the position of the extension 24 changes until it becomes nearly parallel to the axis of the pouring tube 14 (axis A parallel to the axis).

[0032] In this way, according to the cap 1, the tip 20 of the pouring tube 14 is bent at the groove portion 25, so that the tip 20 does not expand relative to the axis of the pouring tube 14, thereby improving the liquid drainage.

[0033] Furthermore, since the tip 20 of the pouring tube 14 is doubly sealed by the inner peripheral protrusion 32 and the outer peripheral protrusion 31, the sealing performance can be improved.

[0034] Furthermore, since the entire circumference of the tip 20 of the pouring tube 14 is sealed, the sealing performance can be further improved.

[0035] In addition, since the area t of the contact portion t between the outer peripheral protrusion 31 and the tip 20 of the pouring tube 14 is relatively small, the tip 20 of the pouring tube 14 is less likely to deform when the top lid 3 is opened, thereby further improving the liquid drainage.

[0036] Furthermore, since the bending of the grooves 25 is promoted by the portions 26 formed in an angular shape, the grooves 25 are bent appropriately, and as a result, the liquid drainage can be further improved.

[0037] A method for manufacturing the cap 1 will now be described.

[0038] The manufacturing method of the cap 1 includes an injection molding step of molding the lid body 2 and the top lid 3 shown in Fig. 1 from synthetic resin by injection molding. The manufacturing method of the cap 1 also includes an attachment step of attaching the top lid 3 to the lid body 2 at a temperature at which the tip 20 of the pouring tube 14 is plastically deformed.

[0039] In the injection molding process, synthetic resin melted by heating is poured into a metal mold (not shown) for molding the lid body 2 and the top lid 3. The synthetic resin poured into the metal mold is, for example, polyethylene resin. After that, the synthetic resin hardens in the metal mold to form the lid body 2 and the top lid 3, and then the lid body 2 and the top lid 3 are removed from the metal mold (demolded).

[0040] The lid body 2 and the upper lid 3 taken out of the mold are naturally cooled. Here, before the temperature of the tip 20 of the pouring tube 14 drops to a temperature at which it no longer undergoes plastic deformation, specifically, when the tip 20 of the pouring tube 14 is at or above 40°C, the upper lid 3 is attached to the lid body 2 as shown in Figs. 2 to 4. As a result, the protruding portion 24 of the tip 20 is plastically deformed to the state shown in Fig. 5, that is, to a position that is nearly parallel to the axis of the pouring tube 14 (axis A parallel to the axis). After that, even if the upper lid 3 is opened, the protruding portion 24 of the tip 20 maintains a position that is nearly parallel to the axis of the pouring tube 14 (axis A parallel to the axis).

[0041] In this way, according to the manufacturing method of the cap 1, it is sufficient to simply attach the upper lid 3 to the lid main body 2 to prevent the tip portion 20 from spreading out relative to the axis of the dispensing tube 14, so that the cap 1 can be manufactured extremely simply.

[0042] In the above embodiment, the hinged cap 1 has been described as an example of the cap 1, but a non-hinged cap may also be used. An example of a non-hinged cap is a screw-type cap in which the top cover 3 is attached to the lid body 2 by screwing.

[0043] In the above embodiment, the lid body 2 is described as being attached to the mouth m of the container B, but it may be attached to a part other than the mouth m as long as it is a part that pours out the liquid L contained in the container B. For example, when the cap 1 is a spout and the container B is a pouch, the spout is attached to a part that pours out the liquid L contained in the pouch.

[0044] Furthermore, although not described in detail in the above embodiment, the tip portion 20 folded back on the outer periphery of the dispensing tube 14 may be the entire circumference of the dispensing tube 14, or may be a part of the entire circumference of the dispensing tube 14. Of course, if the tip portion 20 folded back on the outer periphery of the dispensing tube 14 is the entire circumference of the dispensing tube 14, the liquid cut-off property can be further improved.

[0045] In addition, the above embodiment is illustrative in all respects and is not restrictive. The scope of the present invention is indicated by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. Among the configurations of the cap 1 described in the above embodiment, those other than those described as the first invention in the "Means for solving the problem" are optional configurations and can be deleted or modified as appropriate. [Explanation of symbols]

[0046] B container 1 Cap 2 Lid body 3 Top lid 10 Pedestal 11 External cylinder 12 Inner cylinder 14 Pour tube 15 Annular groove 16 Pull Ring 20 Tip 21 Tip 23 Expanded diameter part 24 Overhang 25 Groove 26-sided section 31 Outer periphery protrusion 32 Inner peripheral protrusion

Claims

1. A lid body that is attached to the container; The lid body is provided with a detachable upper lid, The lid body has a pouring tube having a tip portion folded back on the outer periphery, The upper lid has an outer peripheral protrusion that contacts the tip of the pouring tube from the outer periphery when the upper lid is attached to the lid body, The tip of the pouring tube has a groove portion on the inside of the fold that is thinner than an adjacent portion, The cap is characterized in that the groove portion is a portion that is bent when an outer peripheral protrusion abuts against the tip portion of the pouring tube from the outer periphery.

2. 2. The cap according to claim 1, wherein the groove is formed in an angular shape.

3. 3. The cap according to claim 1, wherein the upper lid has an inner peripheral protrusion that comes into contact with the tip of the pouring tube from its inner periphery when the upper lid is attached to the lid body.

4. 4. The cap according to claim 3, wherein the inner peripheral protrusion and the outer peripheral protrusion each abut against the tip of the pouring cylinder over their entire circumference.

5. A cap as described in any one of claims 1 to 4, characterized in that the area of ​​the tip of the injection tube from the part abutting the outer peripheral protrusion on the outside of the fold to the tip of the injection tube is larger than the area of ​​the part abutting the outer peripheral protrusion on the outside of the fold to the tip of the injection tube.

6. A method for manufacturing the cap according to any one of claims 1 to 5, comprising the steps of: an injection molding process for molding a lid body and a top lid from synthetic resin by injection molding; and a mounting step of mounting the upper lid on the lid body at a temperature at which the tip of the pouring tube plastically deforms.

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