JP6234106B2 - Synthetic resin cap and manufacturing method thereof - Google Patents

Description

  The present invention relates to a synthetic resin cap and a method for producing the same, and more particularly to a synthetic resin cap that can be easily opened and a method for producing the same.

  Conventionally, in the field of foodstuffs and the like, a synthetic resin cap (hinge cap) with a hinged upper lid is used as a means for preventing the inside and outside of the container from flowing in order to maintain the quality of the contents. Such a hinge cap has a planned opening portion in which a weakened portion such as a score is formed, and pulls a pull ring or the like standing on the planned opening portion to break the weakened portion and remove the planned opening portion. Thus, the contents can be taken out. However, the removal of the planned opening portion has not been easy for a person with weak hand power such as a child or an elderly person.

  On the other hand, the planned opening portion is important not only from the inside and outside of the container but also from the viewpoint of hygiene such as preventing the contents from scattering into the cap when the hinge cap is attached to the container body. Therefore, it is difficult to eliminate the planned opening portion itself. Therefore, a hinge cap that can be opened together with the lid when a consumer like the one disclosed in Patent Document 1 first opens the top lid has been proposed.

  The hinge cap disclosed in Patent Document 1 engages an engagement wall erected on the planned opening portion with a hanging piece suspended from the upper lid, thereby opening the upper lid together with the engagement wall. By pulling up, the weakened part is broken and the planned opening part is removed.

JP 10-338253 A

  However, in the hinge cap disclosed in Patent Document 1, the hinge cap is formed with the upper lid opened, and the upper lid is closed by being rotated about the hinge as a fulcrum. When engaging the engaging wall with the hanging piece, first, the hanging piece is brought into partial contact with the engaging wall from an oblique direction. Therefore, a local load is applied to the weakened portion, and the weakened portion may break during the manufacture of the cap, i.e., the inside and outside of the container with the cap attached communicate with each other, and the quality of the contents is reduced. There was a problem that it may become impossible to hold.

  Therefore, when manufacturing a synthetic resin cap, the present invention prevents the weakened portion formed in the planned opening portion from breaking and easily opens together with the opening when the customer first opens the upper lid. An object of the present invention is to provide a synthetic resin cap that can be opened.

The present invention has a bottom wall in which an opening is formed and an upper lid connected to the bottom wall via a hinge portion. A cylindrical wall is formed on the inner surface of the top wall of the upper lid, and a bottom wall is formed on the bottom wall of the bottom wall. A base portion having a lid portion having a lid connecting portion and a top wall having a base connecting portion connected to the lid connecting portion and a planned opening portion to which a separation piece is connected via a weakening portion; The separation piece is hooked to the cylindrical wall of the lid portion when the lid portion and the base portion are connected to each other, and from the base portion when the upper lid is subsequently opened. It is a synthetic resin cap provided so as to be separable, and the separation piece has a tapered side wall opposite to the hinge part, and the side wall is continuous with the weakened part. This is a synthetic resin cap.

The lid connecting portion may be a fitting tube, and the base connecting portion may be a fitting groove provided to be fitted to the fitting tube. Further, the lid connecting portion may be a screwing cylinder, and the base connecting portion may be a screwing groove provided so as to be screwable with the screwing cylinder. Moreover, the said opening scheduled part may be provided in the position eccentric in the pouring direction of the content from the center position of the said top wall . Further , the lid portion may be molded from a heat resistant resin, and the base portion may be molded from a resin having higher flexibility than the heat resistant resin.

  The present invention also includes a step of forming a lid portion having an upper lid having a cylindrical portion and a bottom wall coupled to the upper lid via a hinge portion and having an opening, and a separation piece is provided via the weakening portion. A synthetic resin cap comprising: a step of forming a base portion having a connected opening planned portion; and a step of connecting the lid portion and the base portion and engaging the separation piece and the cylindrical portion. It is a manufacturing method.

  In the present invention, when the synthetic resin cap is opened, since the separation piece is hooked to the lid portion, the separation piece can be pulled with the rotation of the upper lid, and the weakened portion is broken by the force. Therefore, even a person with weak hand power can easily open the lid.

  Further, in the present invention, since the lid portion and the base portion are separated from each other, the lid portion can be attached from above the base portion, so that the force is expected to be opened when the separation piece is hooked on the cylindrical wall. The entire weakened portion of the portion can be applied substantially evenly, and the weakened portion can be prevented from being broken at that time.

It is a figure which shows 1st Embodiment of this invention, and is sectional drawing in the II line | wire of FIG. It is a top view which shows 1st Embodiment of this invention. It is a figure which shows the cover part of 1st Embodiment of this invention, and is a figure equivalent to FIG. It is a figure which shows the base of 1st Embodiment of this invention, and is a figure equivalent to FIG. It is a figure which shows the mode after opening of 1st Embodiment of this invention, and is a figure equivalent to FIG. It is a figure which shows 2nd Embodiment of this invention, and is a figure equivalent to FIG.

  A first embodiment of the present invention will be described with reference to FIGS. First, the configuration of the present embodiment will be described. A synthetic resin cap 1 (hereinafter simply referred to as a cap 1) includes a lid 2 and a base 3 connected to the lid 2.

  The lid portion 2 has an upper lid 4 and a bottom wall 6 coupled via the upper lid 4 and the hinge portion 5. The upper lid 4 has a top wall 7 and a skirt wall 8 that hangs down from the outer peripheral edge of the top wall 7. One end of the skirt wall 8 is continuous with the hinge portion 5, and a flange portion 9 is formed at the other end. An inner ring 10 is suspended from the inner surface 7 a of the top wall 7, and a cylindrical wall 11 is suspended from the inner surface 7 a inside the inner ring 10. A latching protrusion 12 is provided around the lower end of the inner surface of the cylindrical wall 11. The inner ring 10 is formed so as to contact the inner surface of the dispensing tube 13 when the upper lid 4 is closed (hereinafter also simply referred to as a closed lid).

  As for the bottom wall 6, the latching cylinder 14 is standingly arranged by the outer-periphery edge part of the top | upper surface, and the extraction | pouring pipe | tube 13 is standingly arranged by the bottom wall top surface inward rather than the latching cylinder 14. FIG. Further, a fitting cylinder 15 as a connecting portion (lid connecting portion) when the lid portion 2 is connected to the base portion 3 is vertically provided on the bottom wall bottom surface 6a. An opening 16 is formed in the bottom wall 6 on the inner side of the dispensing tube 13. The locking cylinder 14 is provided to lock the upper lid 4 when the lid is closed, and the opening 16 is formed so that the separation piece 23 can penetrate when the lid 2 is attached to the base 3.

  The base 3 has a top wall 17 and an outer cylinder 18 that hangs down from the outer peripheral edge of the top wall 17. An inner cylinder 19 is suspended from the bottom surface of the top wall 17, and an opening of a container body (not shown) is fitted between the outer cylinder 18 and the inner cylinder 19. The top surface 17 a of the top wall 17 is formed with a fitting groove 20 provided so as to be fitted to the fitting cylinder 15 as a connecting portion (base connecting portion) when the base 3 is connected to the lid portion 2. The In the present embodiment, the fitting groove 20 passes through the top surface 17 a and reaches the inner cylinder 19. A planned opening portion 21 is formed on the top wall 17 on the inner side of the inner cylinder 19.

  The planned opening portion 21 has a separation piece 23 connected by a weakening portion 22. The separation piece 23 is provided with a hooking protrusion 24 formed on the top thereof so as to be hookable with the hooking protrusion 12 of the cylindrical wall 11. In the present embodiment, the separation piece 23 has a tapered surface on the side wall 23a on the flange 9 side (opposite side of the hinge portion 5).

  The hooking protrusions 24 and the hooking protrusions 12 may be formed so as to be hooked (hooked) with each other when the lid is closed, or may be intermittently formed with one of them aligned with the other position. Is possible. Further, the size of the engaging protrusion 24 can be adjusted as necessary, and it is not always necessary to have the same size over the entire circumference. For example, when the upper lid 4 is opened (hereinafter, also simply referred to as “opening”), either the flange portion 9 side or the hinge portion 5 side is arranged so that stress is easily concentrated on the cutting start portion of the weakened portion 22. Can be formed to be smaller than the other. In the present embodiment, the hooking protrusion 24 is formed so that the flange portion 9 side is smaller than the hinge 5 portion side.

  The weakened portion 22 is formed to a thickness that allows the separation piece 23 to be separated from the base portion 3 when the lid is opened, and preferably has a thickness of 0.25 mm or less. By doing in this way, it becomes possible to reduce more force required at the time of opening.

  The lid 2 and the base 3 may be molded from the same resin, but each may be molded from a different resin. For example, the base 3 can be molded from a resin having relatively high flexibility such as polyethylene, and the lid 2 can be molded from a resin having relatively low flexibility such as polypropylene. By doing in this way, it becomes possible to improve the heat resistance which is a weak point of highly flexible resin, making the weakening part 22 easy to fracture | rupture. In addition, it is easy to secure the latching force of the latching protrusion 12.

  Further, in the present embodiment, the planned opening portion 21 has a substantially hexagonal shape in plan view so that the top wall 17 does not become an obstacle to the contents being poured out, and the flange 9 side (note) from the center position of the cap 1. It is formed at a position close to the exit direction), that is, a position eccentric from the center position of the top wall 17 to the content extraction direction, but the shape, position, etc. (including size) of the planned opening portion 21 Can be appropriately changed.

Next, the manufacturing method of this embodiment is demonstrated.
(1) The lid portion 2 and the base portion 3 are molded separately by existing molding means such as injection molding. At this time, the upper lid 4 is molded with the lid opened.

  (2) After closing the upper lid 4, the lid portion 2 and the base portion 3 are connected by fitting the fitting tube 15 of the lid portion 2 and the fitting groove 20 of the base portion 3 by means such as plugging. At that time, the separation protrusion 23 of the separation piece 23 is hooked on the latching protrusion 12 of the cylindrical wall 11, and the separation piece 23 and the cylindrical wall 11 are engaged with each other.

  At this time, since the lid portion 2 is attached to the base portion 3 from above, the force (such as a plugging force) at that time is applied substantially uniformly to the entire weakened portion 22 and locally applied to the weakened portion 22. Can be prevented. In addition, the said process (2) can also be performed after attaching the base 3 to a container main body by means, such as a stopper.

  Furthermore, the opening method of the container (not shown) with which this embodiment was mounted | worn by means, such as a stopper, is demonstrated. When the upper lid 4 is rotated with the hinge portion 5 as a fulcrum, the latching protrusions 12 of the cylindrical wall 11 are hooked by the hooking protrusions 24 of the separating piece 23, so that the separating piece 23 is pulled up in the rotating direction of the upper lid 4. The weakened portion 22 is broken by the force applied at that time, the planned opening portion 21 is removed, and the communication port 21A is formed, whereby the container is opened.

  At this time, the side wall 23a on the flange 9 side of the separation piece 23 is preferably a tapered surface. Since the side wall 23a on the side of the flange portion 9 is a tapered surface, stress tends to concentrate on the cut start portion of the weakened portion 22, and opening can be performed with a smaller force.

  Next, a second embodiment of the present invention will be described with reference to FIG. The difference between the present embodiment and the first embodiment is that a threaded tube 26 in which a thread 25 is formed and a threaded groove 29 in which a thread 28 is formed are used instead of the fitting tube 15 and the fitting groove 20. It is that. Since other configurations are the same as those in the first embodiment, description thereof will be omitted.

  In the present embodiment, as a connecting portion when the lid portion 2 and the base portion 3 are connected to each other, a threaded cylinder 26 having a thread 25 formed on the outer peripheral surface is suspended from the bottom wall bottom surface 6a of the lid portion 2. . An annular groove 27 is formed on the bottom wall bottom surface 6 a outside the screwed tube 26. The top wall top surface 17a of the base 3 is formed with a thread 28 that can be screwed with the thread 25 of the threaded tube 26 as a connection when the base 3 and the lid 2 are connected. A threaded groove 29 is formed. On the top top surface 17 a outside the screw groove 29, an annular convex portion 30 provided so as to be fitted to the annular groove 27 is formed.

  In this embodiment, the screwing groove 29 penetrates the top surface 17a and reaches the inner cylinder 19 in the same manner as the fitting groove 20 of the first embodiment, and has a substantially circular shape in plan view for convenience in manufacturing. The separation piece 23 is provided in the center of the top wall top surface 17a. As in the first embodiment, the position, shape, etc. of the separation piece 23 can be changed as appropriate.

  In the present embodiment, the lid portion 2 is coupled (screwed) to the base portion 3 by screwing the screwing cylinder 26 and the screwing groove 29 of the base portion 3. At that time, the annular groove 27 and the annular convex portion 30 serve as a stopper so that the lid portion 2 is rotated more than necessary and the weakened portion 22 is twisted and broken. .

  In this embodiment, when attaching the lid part 2 to the base part 3, it is easier to adjust the force at that time than in the case of fitting with a stopper, so that the weakened part 22 is further broken. It is possible to prevent.

  As mentioned above, although this invention was demonstrated by the said embodiment, this invention is not limited to the said embodiment. For example, in the above-described embodiment, the fitting cylinder 15 or the screwing cylinder 29 is provided in the lid portion 2, and the fitting groove 20 or the screwing groove 29 is provided in the base portion 3, but the fitting is performed from the top wall top surface 17 a of the base portion 3. It is also possible to provide a fitting groove or the like on the bottom bottom surface 6 a of the lid portion 2 by erecting a cylinder or the like. At that time, it is also possible for the fitting groove or the like to penetrate the bottom wall 6 and reach the pouring tube 13. Further, the weakened portion 22 can be provided with a protruding portion so that stress is easily concentrated on the cut starting portion. Then, the pouring cylinder 13 may be erected from the top wall top surface 17 a of the base 3 without providing the lid 2.

  Further, the length of the cylindrical wall 11 and the like can be adjusted as appropriate. For example, until the engagement between the upper lid 4 and the locking cylinder 14 is released by providing a space between the engagement protrusion 24 and the engagement protrusion 12 by adjusting the length of the cylinder wall 11 or the like. It is possible to delay the engagement between the engagement protrusion 24 and the engagement protrusion 12. As a result, the weakened portion 22 breaks later after the engagement between the upper lid 4 and the locking cylinder 14 is released, so that it is necessary to simultaneously apply the force necessary for releasing the engagement and the force required for the breaking at the time of opening. It becomes possible to complete opening with a weaker force.

  And it is also possible to combine each structure of 1st Embodiment or 2nd Embodiment suitably.

DESCRIPTION OF SYMBOLS 1 Synthetic resin cap 2 Cover part 3 Base part 4 Top cover 5 Hinge part 6 Bottom wall 6a Bottom wall bottom face 7 Top wall 7a Top wall inner surface 8 Skirt wall 9 Gutter part 10 Inner ring 11 Cylindrical wall 12 Suspension protrusion 13 14 locking cylinder 15 fitting cylinder 16 opening 17 top wall 17a top wall top surface 18 outer cylinder 19 inner cylinder 20 fitting groove 21 opening planned portion 21A communication port 22 weakening portion 23 separation piece 23a separation piece side wall 24 engagement protrusion 25 screw Thread 26 Threaded tube 27 Annular groove 28 Thread 29 Threaded groove 30 Annular projection

Claims (6)

A bottom wall having an opening and an upper lid connected to the bottom wall via a hinge portion, a cylindrical wall is formed on the inner surface of the top wall of the upper lid, and a lid portion connecting portion on the bottom surface of the bottom wall A lid having
A base portion having a base connecting portion connected to the lid connecting portion and having a top wall formed with a planned opening portion to which a separating piece is connected via a weakening portion;
The separation piece is hooked on the cylindrical wall of the lid portion when the lid portion and the base portion are connected, and is provided so as to be separable from the base portion when the upper lid is subsequently opened. A synthetic resin cap,
The separation piece has a tapered surface on the side wall opposite to the hinge portion,
The synthetic resin cap , wherein the side wall is continuous with the weakened portion . The lid connecting portion is a fitting cylinder,
The synthetic resin cap according to claim 1, wherein the base connecting portion is a fitting groove provided so as to be fitted to the fitting cylinder. The lid portion connecting portion is a screwed tube,
2. The synthetic resin cap according to claim 1, wherein the base connecting portion is a screwing groove provided so as to be screwable to the screwing cylinder.   The synthetic resin cap according to any one of claims 1 to 3, wherein the planned opening portion is provided at a position that is decentered in a content pouring direction from a center position of the top wall. The lid is molded from a heat-resistant resin,
The synthetic resin cap according to any one of claims 1 to 4 , wherein the base portion is formed of a resin having higher flexibility than the heat resistant resin. A method for producing a synthetic resin cap according to any one of claims 1 to 5,
Forming a lid portion having an upper lid having a cylindrical portion and a bottom wall coupled to the upper lid via a hinge portion and having an opening formed;
Forming a base portion having a planned opening portion to which a separation piece is connected via a weakening portion;
A method of manufacturing a synthetic resin cap, comprising: a step of connecting the lid portion and the base portion and engaging the separation piece and the cylindrical portion.

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