JP2017226460A - Cap structure and packaging container using the same - Google Patents

Abstract

Provided is a cap structure that can be applied to a packaging container sealed with a thick sealing member and can be easily opened only by rotating an overcap in the opening direction. An outlet portion of an inner cap is closed by a plate-shaped sealing member. Further, the inner ring 18 of the overcap 3 is inserted into the extraction portion 10 of the inner cap 2, and the opening ring 14 is screwed to the outer surface of the inner ring 18. Further, the rotation of the unsealing ring 14 around the axis AX is prevented. The inner ring 18 and the unsealing ring 14 have the same lead direction as that of the screw portions 8 and 16 and have larger leads than the screwed structure of the screw portions 8 and 16. When the overcap 3 is rotated in the opening direction, the opening ring 14 presses the sealing member 12 to break it. [Selection] Figure 5

Description

  The present invention relates to a cap structure that seals a container having an opening, such as a bottle, in a hermetically sealed state and enables resealing after opening, and a packaging container using the same.

  Patent Document 1 describes a spout stopper attached to a liquid paper container. The spout stopper described in Patent Document 1 seals the spout, a cap that is screwed onto the outer surface of the spout, an opening cylinder that is accommodated above the spout pipe of the spout, and a lower part of the pour pipe. And a sealing film. The opening cylinder is provided with a lowering guide slope that slides on the lowering guide slope of the guide inner cylinder of the cap, and a saw blade-shaped opening blade. When the cap is rotated in the direction of removing the cap, the unsealing cylinder is guided and lowered by the descending guide slope, and the unsealing blade cuts the sealing film, whereby the liquid paper container can be unsealed.

Japanese Patent No. 3911745

  In the opening structure of the spout stopper described in Patent Document 1, the rotation of the cap is converted into a linear motion of the opening cylinder by the cam structure, and the opening blade of the opening cylinder is pressed against the sealing film. The configuration in which the opening blade is pressed against the sealing member using such a cam structure can be easily cut when the sealing member is a thin sealing film, but the spout and the sealing member are integrated with resin. Like a molded plug, it is difficult to cut a sealing member that is more rigid than a film.

  Therefore, the present invention is applicable to a packaging container sealed with a thick sealing member, and an object of the present invention is to provide a cap structure that can be easily opened simply by rotating the overcap in the opening direction. And

  The present invention relates to a cap structure that seals a container having an opening, and includes a base attached to the opening, a cylindrical pouring part, and a sealing member that seals the pouring part. The inner cap has an inner ring that is accommodated inside the pouring portion with a predetermined gap between the inner cap having the inner portion and the inner peripheral surface of the pouring portion, and is rotated by a rotation about a predetermined rotation axis. And an opening cap provided between the inner ring and the extraction portion in a state of being screwed to the outer peripheral surface of the inner ring. The outer surface of the opening ring and the inner surface of the dispensing portion are provided with a guide structure that guides the opening ring in a direction parallel to the rotation axis and restricts rotation around the rotation axis. The inner ring and the opening ring are The screwing structure constituted by the inner cap and the overcap is the same as the screwing direction, and the screwing structure is longer than the screwing structure constituted by the inner cap and the overcap. . The sealing member is provided with a radial fragile portion. As the inner cap rotates in the opening direction, the loosening of the inner ring and the opening ring proceeds, and the opening ring moves relative to the base portion side, so that the opening ring becomes a fragile part of the sealing member. To break.

  Moreover, the packaging container which concerns on this invention is equipped with the container which has an opening part, and said cap structure, and the attaching part provided in the base part of the inner cap is attached to the opening part of a container.

  The present invention can be applied to a packaging container sealed with a thick sealing member, and can provide a cap structure that can be easily opened only by rotating the overcap in the opening direction.

Front view of packaging container using cap structure according to embodiment Sectional view along the II-II line shown in FIG. Sectional view along the III-III line shown in FIG. Sectional drawing which follows the IV-IV line shown in FIG. The figure explaining the opening process of the cap structure which concerns on embodiment Schematic showing the details of the fracture process of the sealing member Sectional drawing which shows the state which resealed after opening the cap structure which concerns on embodiment The figure explaining a part of manufacturing process of the cap structure which concerns on embodiment

  FIG. 1 is a front view of a packaging container using a cap structure according to an embodiment.

  The packaging container 5 includes a bottle-shaped container 4 having an opening (not shown) and a cap structure 1 that seals the opening of the container 4. The cap structure 1 includes an inner cap 2 that is attached to the opening of the container 4, an overcap 3 that is screwed into the inner cap 2, and an unillustrated opening ring.

  2 is a cross-sectional view taken along line II-II shown in FIG. 1, FIG. 3 is a cross-sectional view taken along line III-III shown in FIG. 2, and FIG. 4 is an IV shown in FIG. It is sectional drawing which follows the -IV line. An axis AX shown in the drawing is a rotation axis when the overcap 3 is screwed to the inner cap 2. In the present embodiment, the axis AX, the central axis of the inner cap 2, the central axis of the overcap 3, the central axis of the unsealing ring 14, and the central axis of the container 4 coincide.

<Configuration of inner cap>
The inner cap 2 is an integrally molded product of resin, and includes a base portion 9, a pouring portion 10, and a sealing member 12 that seals the pouring portion. As the resin constituting the inner cap 2, it is preferable to use linear low density polyethylene (LLDPE), low density polyethylene (LDPE), or a mixture thereof.

  The base portion 9 includes an attachment portion 7 attached to the opening 6 of the container 4 and a screw portion 8.

  The attachment part 7 has a substantially cylindrical shape, and is fixed to the container 4 by fitting into the opening part 6 with the opening part 6 of the container 4 being sandwiched therebetween. A contact ring (not shown) is provided over the entire circumference in the portion of the mounting portion 7 that faces the upper end surface of the opening 6 of the container 4. By closely contacting the upper end surface of the opening 6 of the container 4, the space between the container 4 and the inner cap 2 is sealed. In this embodiment, the attachment portion 7 is attached to the opening 6 of the container 4 by fitting. However, a screw thread that can be screwed into the attachment portion 7 and the opening 6 of the container 4 is provided. May be screwed into the opening 6.

  The screw portion 8 has a substantially cylindrical shape and is connected to the attachment portion 7. A male screw that can be screwed into the overcap 3 is provided on the outer peripheral surface of the screw portion 8.

  The extraction part 10 has a cylindrical shape (tube shape) with the axis AX as the central axis. One end portion 11 a of the extraction portion 10 is connected to the screw portion 8 of the base portion 9. The other end 11b of the extraction part 10 is an open end. Further, as shown in FIG. 3, guide grooves 20 extending in the axis AX direction are provided at equal intervals in the circumferential direction on the inner peripheral surface of the extraction portion 10. The guide groove 20 is for guiding an opening ring 14 to be described later, and details will be described later.

  The sealing member 12 is a thin plate-like member and closes the inner peripheral surface of the extraction part 10. As shown in FIG. 4, the sealing member 12 is provided with weak portions 13 that extend radially from the center. This weak part 13 is provided in order to make it easy to fracture | rupture the sealing member 12 with the pressing force of the ring 14 for opening mentioned later. The fragile portion 13 is formed by, for example, half cut. When forming the weak part 13 by a half cut, you may provide a half cut only in the single side | surface of a sealing member, and may provide in both surfaces. Further, as shown in FIG. 4, the sealing member 12 is provided with a plurality of ribs 15 arranged in an annular shape. Each of the ribs 15 is provided between the fragile portions 13 adjacent in the circumferential direction so as not to overlap the fragile portions 13. These ribs 15 suppress the elongation of each part of the sealing member partitioned by the fragile portion 13 and promote the occurrence of cracks in the fragile portion 13, thereby breaking at the fragile portion 13 which is a planned breakage location. Make it easier to happen.

<Configuration of overcap>
The overcap 3 is an integrally molded product of resin, and is connected to the screw portion 16 screwed into the screw portion 8 of the base portion 9 and the inner side of the top portion 17 and has a cylindrical inner ring 18 with the axis AX as the central axis. And have. In order to suppress elongation and deformation of the overcap 3 at the time of opening, a resin such as polypropylene (PP) or high density polyethylene (HDPE) is used as the resin constituting the overcap 3. In order to give rigidity, it is preferable to use a material having a relatively high flexural modulus, and it is preferable to make the screw portion to which torque (load) is applied thicker than other portions.

  The inner ring 18 is accommodated inside the extraction portion 10 of the inner cap 2 in a state where the overcap 3 is screwed into the inner cap 2. The outer diameter of the inner ring 18 is set smaller than the inner diameter of the extraction portion 10, and a predetermined gap is formed between the outer surface of the inner ring 18 accommodated in the extraction portion 10 and the inner surface of the extraction portion 10. The Further, on the outer surface of the inner ring 18, a male screw that can be screwed with an opening ring 14 to be described later is provided.

<Configuration of opening ring>
The opening ring 14 is a cylindrical member having the axis AX as a central axis, and has an internal thread on the inner peripheral surface. The opening ring 14 is provided between the inner ring 18 and the extraction portion 10 in a state of being screwed to the outer peripheral surface of the inner ring 18 of the overcap 3. As shown in FIG. 2, the lower end portion of the opening ring 14 is formed so as to become thinner toward the lower end edge. This is because the axis AX added to the opening ring 14 when the inner cap 2 is opened. This is because the directional force is concentrated on the lower edge of the opening ring 14.

  Further, as shown in FIG. 3, a plurality of ridges 21 extending in the axis AX direction are provided on the outer surface of the opening ring 14 at equal intervals in the circumferential direction. The number and arrangement of the ridges 21 are the same as the number and arrangement of the guide grooves 20 provided in the extraction portion 10, and each of the ridges 21 and each of the guide grooves 20 have substantially the same cross-sectional shape. Therefore, the unsealing ring 14 can be inserted into the extraction portion 10 to fit each of the ridges 21 and each of the guide grooves 20 as shown in FIG. The ridges 21 and the guide grooves 20 constitute a guide structure for guiding the unsealing ring 14, and the unsealing ring 14 is inserted by fitting each of the ridges 21 with each of the guide grooves 20. It is guided in a direction parallel to the axis AX with respect to the protruding portion 10, and rotation about the axis AX is prevented. In addition, it is preferable that the guide groove 20 and the ridge 21 are rotationally symmetric about the axis AX so that the positioning at the time of assembly of the cap structure 1 described in FIG. 8 is easy.

  The opening ring 14 is preferably formed of a material having rigidity so that a pressing force can be efficiently transmitted to the sealing member 12. In order to suppress the deformation of the opening ring 14, for example, a resin such as polypropylene (PP) or high density polyethylene (HDPE) is used. In order to provide rigidity, it is preferable to mold the opening ring 14 using a material having a relatively high flexural modulus. Furthermore, a resin such as polystyrene (PS) or impact-resistant polystyrene (HIPS) may be used. Especially when these resins are formed so that the opening ring 14 becomes thinner toward the lower end edge, the tip can be easily formed to be sharp, so that the sealing member 12 is easily broken.

  Here, the screwing structure of the opening ring 14 and the inner ring 18 will be described. The screwing structure constituted by the opening ring 14 and the inner ring 18 has the same screwing direction as the screwing structure constituted by the screw part 16 of the overcap 3 and the screw part 8 of the inner cap 2. Furthermore, the lead (lead angle) of the screwing structure constituted by the opening ring 14 and the inner ring 18 has a screwing structure constituted by the screw part 16 of the overcap 3 and the screw part 8 of the inner cap 2. Larger than lead (lead angle). Therefore, that is, when the overcap 3 is rotated in the opening direction (ie, the direction in which the screwing is loosened), the inner ring 18 rotates in the rotational direction of the overcap 3, whereas the axis AX of the opening ring 14 is rotated. Since the rotation is restricted, the loosening of the screwing between the opening ring 14 and the inner ring 18 proceeds. In addition, since the threaded lead of the opening ring 14 and the inner ring 18 is relatively large, in the process of rotating the overcap 3 in the opening direction, the movement amount of the overcap 3 in the axis AX direction (relative to the inner cap 2). The amount of movement of the unsealing ring 14 in the axis AX direction (the amount of movement relative to the overcap 3) is larger than the amount of movement (relative movement amount).

<Opening process of packaging container>
FIG. 5 is a view for explaining the opening process of the cap structure according to the embodiment, and FIG. 6 is a schematic view showing the details of the breaking process of the sealing member, and shows the inner cap 2 shown in FIG. FIG. 3 is an enlarged view of a part and a part of the opening ring 14. However, in FIG. 6, the illustration of the overcap 3 is omitted for simplification of illustration.

  First, FIG. 5A and FIG. 6A show an unopened state of the packaging container 5.

  In the unopened state, as described above, the contact ring (not shown) provided on the inner cap 2 is in contact with the upper end surface of the opening 6 of the container 4 between the inner cap 2 and the container 4. It is sealed. In the unopened state, the extraction portion 10 of the inner cap 2 is sealed with the sealing member 12.

  Next, FIGS. 5B and 6B show a state in which the overcap 3 is rotated by a predetermined amount about the axis AX in the opening direction (counterclockwise direction when viewed from above the overcap 3). The state before the screwing of the screw part 16 of the overcap 3 and the screw part 8 of the inner cap 2 is released is shown.

  As described above, the opening ring 14 can be moved in the direction of the axis AX by the fitting of the guide groove 20 of the pouring part 10 and the protrusion 21 of the opening ring 14, but the rotation around the axis AX is prevented. Has been. Accordingly, when the overcap 3 is rotated in the opening direction from the state of FIG. 5A in which the overcap 3 is screwed into the inner cap 2 and completely tightened, the overcap 3 is detached from the inner cap 2. On the other hand, the unsealing ring 14 also moves in a direction to be detached from the inner ring 18. As described above, the relative movement amount d2 of the opening ring 14 from the overcap 3 is larger than the relative movement amount d1 of the overcap 3 from the inner cap 2 due to the difference between the leads of the two screwed structures. The working ring 14 moves in a direction approaching the sealing member 12. When the movement amount of the opening ring 14 exceeds a certain amount, the opening ring 14 breaks the fragile portion of the sealing member 12, and as shown in FIGS. 5 (b) and 6 (b), the broken sealing. The member 12 is expanded.

  FIGS. 5C and 6C show a state in which the screwing of the screw portion 16 of the overcap 3 and the screw portion 8 of the inner cap 2 is released.

  Further, when the overcap 3 is rotated in the opening direction, the opening ring 14 and the inner ring 18 are further loosened, and the opening ring 14 further expands the broken sealing member 12 while further expanding the inside of the container 4. Move to the other side. Then, before the screwing of the overcap 3 and the inner cap 2 is released, the ribs 22 (see FIG. 5) are provided so that the ridges 21 of the unsealing ring 14 are provided along the circumferential direction of the inner peripheral surface of the extraction portion 10. 6 (b)), and the protrusions 21 are fitted between the ribs 22 and the peripheral edge of the sealing member 12, as shown in FIG. 6 (c). As a result, the opening ring 14 is locked (engaged) with the inner cap 2 in a state where the broken sealing member 12 is spread. As shown in FIG. 5C, the contents of the container 4 can be poured out from the pouring part 10 by removing the overcap 3.

  FIG. 7 is a cross-sectional view showing a state where the cap structure according to the embodiment is resealed after opening.

  After removing the overcap 3 and pouring the contents of the container 4, the inner ring 18 is inserted into the pouring part 10, and the overcap 3 is closed around the axis AX (viewed from above the overcap 3. The container 4 can be resealed by rotating it clockwise) as shown in FIG. In a state where the container is resealed, the end portion 11b of the pouring portion 10 comes into contact with the thick portion provided at the root portion of the inner ring 18 (the connection portion with the top portion 17), so that the contents are sealed. Secured.

<Manufacturing process of cap structure>
FIG. 8 is a diagram illustrating a part of the manufacturing process of the cap structure according to the embodiment.

  The cap structure 1 can be manufactured as follows.

  First, after the overcap 3 and the opening ring 14 are integrally formed with resin in separate steps, the opening ring 14 is screwed into the inner ring 18 of the overcap 3. The unsealing ring 14 and the inner ring 18 may be screwed together by relatively rotating them in the screwing direction or by fitting with a stopper. When the opening ring 14 is fitted into the inner ring 18 by punching, the opening ring 14 and the overcap 3 are appropriately supported by a jig or the like. Further, it is preferable that the number of threads of the female thread of the opening ring 14 and the male thread of the inner ring 18 is 3 to 4, since both fitting and screwing by a stopper can be easily performed.

  In addition, the inner cap 2 is integrally formed of resin in a separate process from the overcap 3 and the opening ring 14.

  Next, the cap structure 1 is manufactured by fitting the overcap 3 to the inner cap 2 by stoppering. When the overcap 3 is fitted to the inner cap 2, a receiving jig 23 having substantially the same outer shape as the inner shape of the inner cap 2 is placed inside the inner cap 2 in order to prevent the sealing member 12 from being broken. Insert the inner cap 2 to support it. Further, in order to prevent the outer surface of the overcap 3 from being damaged, the overcap 3 is housed in a holding jig 24 having an inner shape substantially the same as the outer diameter of the overcap 3.

  Next, as shown in FIG. 8A, the central axis of the inner cap 2 supported by the receiving jig 23 and the central axis of the overcap 3 held by the holding jig 24 are aligned with each other. The inner caps 2 are pressed toward each other. The female screw passes over the male screw by the pressing force, and the screw portion 16 of the overcap 3 is fitted into the screw portion 8 of the inner cap 2 as shown in FIG. Then, the cap structure 1 is completed by removing the receiving jig 23 and the holding jig 24. The completed cap structure 1 is attached to the opening of the container filled with the contents by fitting or screwing, and the packaging container 5 shown in FIG. 1 is completed.

  In order to facilitate the fitting of the inner cap 2 and the overcap 3 by plugging, the number of threads 8 of the inner cap 2 and the threads 16 of the overcap 3 is 3-4. It is preferable to do. In addition, the number of threads of the screw part 8 of the inner cap 2 and the screw part 16 of the overcap 3 can be appropriately set according to the diameter of the container.

  As described above, in the cap structure 1 according to this embodiment, the sealing member 12 of the inner cap 2 can be broken by simply rotating the overcap 3 in the opening direction by a predetermined amount from the fully-tightened state. Can be opened. Further, the unsealing ring 14 used for breaking the sealing member 12 is locked (engaged) with the inner surface of the dispensing portion 10 of the inner cap 2 in a state where the broken sealing member 12 is pushed and spread, and the contents are poured. It is easy to take out, and it can suppress that the ring 14 for unseal | desorption comes off with the extraction of the contents.

  Further, in the cap structure 1 according to the present embodiment, the sealing member 12 is broken by moving the opening ring 14 in the direction of the axis AX using a screwed structure. Since the outer diameter of the inner ring 18 for moving the opening ring 14 in the axis AX direction is smaller than the outer diameter of the overcap 3, the rotational force acting on the inner ring 18 when the overcap 3 rotates is used for the overcap 3. Larger than the rotational force given by the person. As a result, compared to the structure described in Patent Document 1, a greater force can be applied to the opening ring 14 in the direction of the axis AX, and the sealing member 12 can be strongly pressed by the opening ring 14.

  Therefore, according to the present invention, even when applied to a packaging container that is sealed with a sealing member 12 that is thicker than a film, such as a resin molded body, the overcap 3 is simply rotated in the opening direction. The cap structure 1 that can be easily opened can be realized.

  INDUSTRIAL APPLICABILITY The present invention can be used for a packaging container that can seal the contents and can be resealed after opening.

DESCRIPTION OF SYMBOLS 1 Cap structure 2 Inner cap 3 Overcap 4 Container 5 Packaging container 6 Opening part 7 Attachment part 9 Base part 10 Extraction part 11a, 11b End part 12 Sealing member 13 Fragile part 14 Opening ring 15 Rib 18 Inner ring 20 Guide groove 21 ridge 22 rib

Claims (3)

A cap structure for sealing a container having an opening,
An inner cap having a base part attached to the opening, a cylindrical pouring part, and a sealing member for sealing the pouring part;
The inner cap has an inner ring that is accommodated inside the pouring portion with a predetermined gap between the inner peripheral surface of the pouring portion, and the outer peripheral surface of the inner cap is rotated around a predetermined rotation axis. An overcap screwed into the
An opening ring provided between the inner ring and the extraction portion in a state of being screwed to the outer peripheral surface of the inner ring;
On the outer surface of the opening ring and the inner surface of the extraction portion, a guide structure is provided that guides the opening ring in a direction parallel to the rotation axis and restricts rotation around the rotation axis,
The inner ring and the unsealing ring are formed of the inner cap and the overcap, and the screwing structure and the overcap are formed in the same direction. Constructs a screwed structure with longer leads than the screwed structure,
The sealing member is provided with a radial fragile portion,
As the inner cap is rotated in the opening direction, loosening of the inner ring and the opening ring proceeds, and the opening ring moves relative to the base portion side, whereby the opening ring A cap structure for breaking the fragile portion of the sealing member.   After the opening ring breaks the fragile portion of the sealing member, the screwing portion between the inner cap and the overcap is released on the dispensing portion of the inner cap. The cap structure according to claim 1, further comprising a lock portion that locks the unsealing ring in the extraction portion as the overcap rotates in the opening direction. A packaging container,
A container having an opening;
The cap structure according to claim 1 or 2, which seals the opening of the container.
The packaging container in which the attachment part provided in the base part of the inner cap is attached to the opening of the container.

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