Container provided with cap

Abstract

To provide a container provided with a cap, that is capable of easily forming a male screw part of a required depth by injection molding, that is formed from a resin containing polyester with no need of sorting when recycling a container, as a main component.SOLUTION: A container provided with a cap is provided, that comprises a cap 100 capable of screwing into a mouth 220 comprising a male screw part 221 on an outer-peripheral side. The cap 100 comprises: an inner cylinder part 120 comprising a female screw part 122 on an inner-peripheral side, that is extended from a top face 110 and is formed from a resin containing polyester as a main component; and an engagement protrusion 130 formed into a shape of protruding in a direction separating from a top face 110 of an opening end of the inner cylinder part 120, that is extended from the top face 110. The inner cylinder part 120 comprises a plurality of slits 121 extending at least to a top face 110 side from the female screw part 122 from the opening end. The mouth 220 comprises a stopper part 222 contactable with the engagement protrusion 130 provided in the cap 100 on the outer-peripheral side, that is formed from the resin containing the polyester as the main component.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This invention relates to a container with a cap having a male screw portion at the mouth portion and a cap that can be screwed onto the mouth portion.

Background Art

[0002] Conventionally, in containers with caps and the like, the container has a mouth portion with a male screw portion on the outer peripheral side, and a cap that can be screwed onto the mouth portion has an inner cylindrical portion that extends from the top surface and has a female screw portion on the inner peripheral side, which is well-known. In such well-known containers with caps, various materials are used as the container, and containers formed of polyethylene terephthalate, which is a resin containing polyester as a main component, are also widely used. On the other hand, regarding the cap, resins that are easily deformed, such as polyethylene and polypropylene, are widely used.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Containers formed of polyethylene terephthalate, which is a resin containing polyester as a main component, are reused as polyethylene terephthalate materials by recycling. At that time, caps formed of polyethylene, polypropylene, etc. need to be separated and removed, resulting in an increase in recycling costs. Regarding the cap as well, it is conceivable to form it with polyethylene terephthalate as well. However, when forming a shape having a female screw portion that can be screwed in by injection molding, since it is separated from the mold after injection using the flexibility of materials such as polyethylene and polypropylene, it was difficult to simply change to a resin with high rigidity such as polyethylene terephthalate.

[0005] Patent Document 1 discloses a cap formed of "polyethylene terephthalate having a lower hardness than the container". When the container mouth part is relatively large and the depth of the engaging projection part or the female screw part is shallow, it is considered possible to form it by injection molding. However, for example, when the diameter of the mouth part such as a tube container is small, it is difficult to form a female screw part with a required depth by injection molding.

[0006] Therefore, an object of the present invention is to provide a container with a cap that is formed of a resin containing polyester as a main component and does not require separation during recycling of the container, and in which a female screw part with a required depth can be easily formed by injection molding.

Means for Solving the Problems

[0007] The container with a cap of the present invention is a container with a mouth part having a male screw part on the outer peripheral side and a cap that can be screwed onto the mouth part. The cap is formed of a resin containing polyester as a main component, and has a top surface, an inner cylinder part extending from the top surface and having a female screw part on the inner peripheral side, and an engaging projection part formed in a shape protruding in a direction away from the top surface from the open end of the inner cylinder part. The inner cylinder part has a plurality of slits extending from the open end toward the top surface side at least above the female screw part. The mouth part is formed of a resin containing polyester as a main component, and has a stopper part on the outer peripheral side of the mouth part that can come into contact with the engaging projection part, thereby solving the above problems.

Effects of the Invention

[0008] According to the capped container of the invention according to claim 1, since the cap is formed of a resin containing polyester as a main component, it is not necessary to separately remove it during the recycling of the resin containing polyester as a main component. Further, since the inner cylinder portion has a plurality of slits extending from the open end to at least the top surface side of the female screw portion, it becomes possible to separate from the mold after injection by the radial deflection of each of the inner cylinder portions divided by the slits. Even if it is formed of highly rigid polyethylene terephthalate and the diameter of the inner cylinder portion is small, it is possible to easily form a female screw portion having a required depth by injection molding. Also, since a stopper portion that can come into contact with the engaging protrusion portion is provided on the outer peripheral side of the mouth portion, it is possible to limit the screwing depth of the cap onto the mouth portion. Therefore, it is possible to prevent over-tightening caused by each of the inner cylinder portions divided by the slits being easily deflected in the radial direction. Furthermore, by forming the cap and the container of a resin containing polyester as a main component, it is not necessary to separate the cap during the recycling of the container, and it becomes possible to suppress the recycling cost. Also, since it has an engaging protrusion portion formed in a shape protruding in a direction away from the top surface from the open end of the inner cylinder portion, it is possible to limit the screwing depth of the cap onto the mouth portion by providing a stopper portion on the container side. Therefore, it is possible to prevent over-tightening caused by each of the inner cylinder portions divided by the slits being easily deflected in the radial direction.

[0009] According to the configuration described in claim 2, at least one of the engaging protrusion portion or the stopper portion is formed such that the portion having the longest circumferential length is on the outer peripheral side of the portion having the shortest circumferential length. Thus, deformation and deflection of the inner cylinder portion during engagement are suppressed, and it is possible to surely prevent over-tightening. According to the configuration described in claim 3, since the engaging protrusion is extended from the top surface on the outer peripheral side of the inner cylinder portion, the engaging protrusion itself is not bent by tightening, and since it is formed in close contact with the outer peripheral side of the inner cylinder portion, it is possible to suppress the bending of a part of the inner cylinder portion divided by the slit, and it becomes possible to more reliably prevent over-tightening.

[0010] According to the configuration described in claim 4, since the engaging protrusion is provided at two locations in the circumferential direction, it becomes possible to surely engage with the stopper portion provided on the container side with a predetermined tightening. According to the configuration described in claim 5, since the slit is provided at eight locations in the circumferential direction of the inner cylinder portion, the radial bending of each of the inner cylinder portions divided by the slit is optimized, and it becomes possible to separate from the mold after injection and to reduce the bending during tightening by the user. According to the configuration described in claim 6, since the stopper portion is formed so as to be in close contact with the mouth portion, deformation and bending of the stopper portion are suppressed, and it becomes possible to surely engage with the engaging protrusion portion. According to the configuration described in claim 7, the cap has a cap body having a top surface and an inner cylinder portion and a lid body. The cap body has a pouring hole provided on the top surface and communicating with the inside of the inner cylinder portion. The lid body is connected to the cap body by a hinge mechanism and is formed so as to be able to open and close the pouring hole. When pouring the contents of the container, it is not necessary to separate the cap body from the mouth portion of the container, so it becomes possible to suppress the dropping and loss of the cap. Also, it becomes possible to open and close the lid body with one hand while holding the container.

Brief Description of the Drawings

[0011]

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Mode for Carrying Out the Invention

Examples

[0012] As shown in FIGS. 1 to 5, the cap 100 of the container with a cap according to an embodiment of the present invention has a top surface 110 and an inner cylinder portion 120 that extends from the top surface 110 and has a female screw portion 122 on the inner peripheral side. Further, the cap 100 is formed of polyethylene terephthalate, and the inner cylinder portion 120 has a plurality of slits 121 that extend from the open end, which is the end far from the top surface 110, to at least the top surface 110 side of the female screw portion 122. The number of slits 121 is preferably large for easy detachment from the mold during manufacturing, but about 8 is desirable for ensuring the screw fitting force during use. In this embodiment, 8 slits 121 are provided at equal intervals in the circumferential direction. Also, in this embodiment, the inner peripheral side of the inner cylinder portion 120 is also sealed by the top surface 110, but the inner peripheral side of the inner cylinder portion 120 may be open on the top surface 110 side and have a separate lid member.

[0013] On the outer peripheral side of the inner cylinder portion 120, there is an engaging protrusion portion 130 formed to extend from the top surface 110 and protrude in a direction away from the top surface 110 from the open end of the inner cylinder portion 120 (the direction opposite to the top surface 110 in the axial direction of the inner cylinder portion 120). Considering the balance in the circumferential direction during use, it is preferable that there are a plurality of the engaging protrusion portions 130 at equal intervals. Also, since it is desirable to have a smaller number in order to engage deeply with the stopper portion 222 described later in the axial direction, in this embodiment, the engaging protrusion portions 130 are integrally formed with the inner cylinder portion 120 at two opposed positions in the circumferential direction and extend from the top surface 110 in close contact with the outer peripheral side of the inner cylinder portion 120. Also, as shown in FIG. 9, the portion with the longest circumferential length of the engaging protrusion portion 130 is formed on the outer peripheral side of the portion with the shortest circumferential length, and it is formed in an L-shaped configuration when viewed from the bottom surface.

[0014] The mouth portion 220 with which the cap 100 of the capped container according to an embodiment of the present invention is screwed is formed of polyethylene terephthalate. As shown in FIGS. 2, 6 to 8, it extends from the shoulder portion 210 and has a male screw portion 221 on the outer periphery. On the outer peripheral side below the mouth portion 220, a stopper portion 222 that can contact the engaging protrusion portion 130 of the cap 100 extends from the shoulder portion 210 and is formed so as to be in close contact with the mouth portion 220.

[0015] When attaching the cap 100 configured as described above to the mouth portion 220, by fitting the inner cylinder portion 120 of the cap 100 with the mouth portion 220 of the container and turning the cap 100, the female screw portion 122 of the inner cylinder portion 120 and the male screw portion 221 of the mouth portion 220 are screwed together. At this time, in this embodiment, the female screw portion 122 and the male screw portion 221 are provided with two threads, and the screwing is completed at a position where the cap 100 is rotated approximately 200° from the start of screwing.

[0016] The inner cylinder portion 120 of the cap 100 of the capped container of the present invention is provided with a plurality of slits 121 extending to the top surface 110 side from the female screw portion 122, so that when removing from the mold during molding, the inner cylinder portion 120 can bend outward and the mold can exceed the female screw portion 122. In this way, when rotated with a strong force during use, there is a risk that after the screwing is completed, the inner cylinder part 120 may be further pushed outward and rotated further to overcome the screw. However, by arranging the engaging protrusion part 130 of the cap 100 to engage with the stopper part 222 as shown in Fig. 10 when the screwing is completed, further rotation of the cap 100 can be prevented.

[0017] In this embodiment, since the engaging protrusion part 130 and the stopper part 222 are provided at two locations, by setting the protruding amount of the engaging protrusion part 130 to be less than or equal to half of the lead (about 5.2 mm) of the male screw part 221, it is possible to arrange the engaging protrusion part 130 to engage with the stopper part 222 only when the screwing is completed. Also, in this embodiment, the engaging protrusion part 130 and the stopper part 222 are provided in two places each, but the number can be appropriately set according to the angle at which the cap is to be tightened and stopped, the size of the cap, etc. Furthermore, as shown in Fig. 11, an over - ride rib 131 may be provided in front of the stopper part 222 of the mouth part 220. By providing the over - ride rib 131, when the user closes the cap 100, the completion of closing can be sensed by the resistance of passing through the over - ride rib 131, and it is possible to prevent the unintentional loosening of the cap 100 when external force is applied during storage.

Example

[0018] The cap 100B of the container with a cap according to another embodiment of the present invention has a cap body 101 including a top surface 110B and an inner cylinder part 120B extending from the top surface 110B and having a female screw part 122 on the inner peripheral side, and a lid body 102, as shown in Fig. 12. The cap body 101 has a pouring hole 123 provided on the top surface 110B and communicating with the inside of the inner cylinder part 120B. The lid body 102 is connected to the cap body 101 by a hinge mechanism 140 and is formed so as to be able to open and close the pouring hole 123. The structures of the inner cylinder part 120B, the engaging protrusion part 130, the shoulder part 210 of the container, the mouth part 220, the stopper part 222, etc. are the same as those in the above - mentioned embodiment.

[0019] In the above embodiment, the cap and the mouth part were described as being formed of polyethylene terephthalate, but any resin containing polyester as a main component may be used, and it may be formed from a recycled raw material or a biomass-derived raw material from the viewpoint of reducing environmental load. Also, the above embodiment is a container with a cap applicable to a container having a shoulder (such as a tube container or a bottle container), but it may be applied to a container having no shoulder (such as a packaging bag (pouch)), and it may be applied to any container without departing from the gist of the present invention.

Explanation of reference numerals

[0020] 100 ··· Cap 101 ··· Cap body 102 ··· Lid 110 ··· Top surface 120 ··· Inner cylinder part 121 ··· Slit 122 ··· Female screw part 123 ··· Pouring hole 130 ··· Engagement protrusion part 131 ··· Overcoming rib 140 ··· Hinge mechanism 210 ··· Shoulder 220 ··· Mouth part 221 ··· Male screw part 222 ··· Stopper part

Claims

1. A container with a cap, having a mouth portion with a male screw portion on the outer peripheral side and a cap that can be screwed onto the mouth portion, wherein the cap is formed of a resin containing polyester as a main component, and has a top surface, an inner cylindrical portion extending from the top surface and having a female screw portion on the inner peripheral side, and an engaging protrusion portion formed in a shape protruding in a direction away from the top surface from the open end of the inner cylindrical portion, the inner cylindrical portion has a plurality of slits extending from the open end at least upward of the female screw portion toward the top surface side, the mouth portion is formed of a resin containing polyester as a main component, and the container with a cap is characterized in that a stopper portion capable of contacting the engaging protrusion portion is provided on the outer peripheral side of the mouth portion.

2. The container with a cap according to claim 1, wherein at least one of the engaging protrusion portion or the stopper portion is formed such that the portion having the longest circumferential length is formed on the outer peripheral side of the portion having the shortest circumferential length.

3. The container with a cap according to claim 2, wherein the engaging protrusion portion extends from the top surface on the outer peripheral side of the inner cylindrical portion and is formed in close contact with the outer peripheral side of the inner cylindrical portion.

4. The container with a cap according to claim 1, wherein the engaging protrusion portion is provided at two positions in the circumferential direction.

5. The container with a cap according to claim 1, wherein the slits are provided at eight positions in the circumferential direction of the inner cylindrical portion.

6. The container with a cap according to claim 1, wherein the stopper portion is formed so as to be in close contact with the mouth portion.

7. The cap has a cap body including the top surface and the inner cylindrical portion and a lid body, the cap body has a pouring hole provided on the top surface and communicating with the inside of the inner cylindrical portion, and the container with a cap according to claim 1, wherein the lid body is connected to the cap body by a hinge mechanism and is formed so as to be able to open and close the pouring hole.

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