JP6702020B2 - Cap structure and packaging container using the same - Google Patents

Description

  The present invention relates to a cap structure capable of sealing a container having an opening such as a bottle in a hermetically sealed state and resealing after opening, and a packaging container using the cap structure.

  Patent Document 1 describes a cap including an inner plug attached to the mouth of a bottle-shaped container body and an overcap screwed to the mouth of the container body. In the cap described in Patent Document 1, a screwing portion is configured by the planned opening portion provided in the inner plug and the connecting portion provided in the overcap, and the screwing of the screwing portion is over the mouth portion of the container body. The relationship between the screwed portion composed of the cap and the reverse screw is provided. With this configuration, when the overcap is rotated in the opening direction, the screwing between the planned opening provided on the inside plug and the connecting part provided on the overcap advances in the fastening direction, and the planned opening is pulled upward and It is cut from the stopper. With this, from the state where the container body is sealed with the inner plug, the inner plug can be opened simply by rotating the overcap in the opening direction.

Japanese Patent No. 5856319

  In the cap described in Patent Document 1, after opening the inner plug, the planned opening portion cut out from the inner plug is held by screwing into the connecting portion of the overcap.

  However, the planned opening is not fixed to the connecting part of the overcap, so the repeated opening and closing of the overcap may cause contact between the planned opening and the inside plug, which may cause the overcutting of the planned opening. There is a risk that the screwing of the cap with the connecting portion may be loosened and the cut open portion may drop into the container body.

  Therefore, an object of the present invention is to provide a cap structure that can be opened only by the operation of rotating the overcap in the opening direction and that the member cut during the opening can be prevented from falling off.

  The present invention relates to a cap structure for sealing a container having an opening, and an inner cap attached to the opening is screwed to an outer peripheral surface of the inner cap by rotating the inner cap around a predetermined rotation axis. And an overcap. The inner cap has a base portion having a mounting portion to be mounted on the container, a screw portion with which the overcap is screwed, and a tubular shape having a rotation axis as a central axis, and one end is connected to the base portion. , The other end of the spout is opened, the separation part provided inside the spout, and the outer peripheral surface of the separation part and the inner peripheral surface of the spout are connected over the entire circumference, The bridge portion seals between the outer peripheral surface and the inner peripheral surface of the pouring portion. The overcap has a screw portion that is screwed into the base portion, and a shaft body that projects from the inner portion of the top portion of the overcap along the rotation axis. The separating portion is a female screw member having a bottomed cylindrical shape having an opening on the other end side of the pouring portion and having a bottom portion on the side opposite to the opening, and has a thin portion provided on the bottom portion. The shaft body is a male screw member having a sharp tip and a constricted portion adjacent to the tip, and the outermost diameter of the tip is larger than the outermost diameter of the thin portion. The shaft body and the separating portion can be screwed to each other around the rotation axis, and form a screwing structure of a reverse screw to the screwing structure of the inner cap and the overcap. As the overcap is screwed to the inner cap, the screwing of the shaft body and the separating part progresses as the overcap is rotated in the opening direction, and the separating part moves relatively to the top side of the overcap. As a result, the bridge part is broken over the entire circumference, from the state where the overcap is screwed onto the inner cap and completely tightened until the screwing of the overcap and the inner cap is released, As the inner cap is rotated in the opening direction, the shaft body and the separating portion are screwed together, and the tip portion of the shaft body pierces and breaks the thin portion of the separating portion, causing the outermost diameter portion of the tip portion to The separating portion is locked to the shaft body while penetrating the bottom portion.

  A packaging container according to the present invention includes a container having an opening and the cap structure described above, and an attachment portion provided on a base portion of the inner cap is attached to the opening of the container.

  ADVANTAGE OF THE INVENTION According to this invention, the cap structure which can be opened only by the operation|movement which rotates an overcap in an opening direction, and can prevent the member cut|disconnected at the time of opening from falling off can be provided.

Front view of a packaging container using a cap structure according to an embodiment Sectional drawing which follows the II-II line shown in FIG. An enlarged view of the X part shown in FIG. The figure explaining the opening process of the cap structure which concerns on embodiment. The figure which shows the state before and after a shaft penetrates the bottom of a isolation|separation part. 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 the cap structure according to the 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 is composed of an inner cap 2 attached to the opening of the container 4 and an overcap 3 screwed onto the inner cap 2.

  2 is a sectional view taken along line II-II shown in FIG. 1, and FIG. 3 is an enlarged view of a portion X shown in FIG. The axis AX shown in the drawing is a rotation axis when the overcap 3 is screwed into the inner cap 2. In the present embodiment, the axis AX, the center axis of the inner cap 2, the center axis of the overcap 3, and the center axis of the container 4 coincide with each other.

<Inner cap configuration>
The inner cap 2 is a resin integrally molded product, and includes a base portion 9, a spout portion 10, a separation portion 12, and a bridge portion 13. In order to suppress the elongation and deformation of the inner cap 2 at the time of opening, it is preferable to use linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), or a mixture thereof as the resin forming the inner cap 2. preferable.

  The base portion 9 is composed of a mounting portion 7 mounted on the opening 6 of the container 4 and a screw portion 8.

  The mounting portion 7 has a substantially cylindrical shape, and is fixed to the container 4 by being fitted into the opening 6 while sandwiching the opening 6 of the container 4. A contact ring (not shown) is provided over the entire circumference in the portion of the mounting portion 7 facing the upper end surface of the opening 6 of the container 4, and the entire circumference of the contact ring is provided. 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 addition, in the present embodiment, the mounting portion 7 is mounted in the opening 6 of the container 4 by fitting, but the mounting portion 7 and the opening 6 of the container 4 are provided with screw threads that can be screwed. May be screwed into the opening 6.

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

  The spout 10 has a tubular shape (tube shape) with the axis AX as the central axis. One end 11 a of the spout portion 10 is connected to the screw portion 8 of the base portion 9. The other end 11b of the spout 10 is an open end.

  The separation part 12 is a bottomed cylindrical member having the axis AX as a central axis, and is provided inside the pouring part 10. More specifically, the separation part 12 has an opening on the end 11b side of the pouring part 10 and a bottom part 14 on the opposite side of the opening (that is, on the end 11a side of the pouring part 10). The separation portion 12 is a member that is screwed with a shaft body 18 of the overcap 3 described later, and has an internal thread on its inner peripheral surface. Further, as shown in FIG. 3, a thin portion 15 having a smaller thickness than the peripheral portion of the bottom portion 14 is provided in the central portion of the bottom portion 14.

  As shown in FIG. 3, the bridge portion 13 connects the outer peripheral surface of the bottom portion 14 of the separating portion 12 and the inner peripheral surface of the end portion 11 a of the pouring portion 10 over the entire circumference thereof, and thus the separating portion 12 ( The outer peripheral surface of the bottom portion 14) and the inner peripheral surface of the pouring portion 10 (end portion 11a) are sealed. The bridge portion 13 is a breakable portion to be broken when the overcap 3 is opened when the packaging container 5 is opened, and is formed thin enough to be broken by the force applied to the overcap 3. .

<Overcap composition>
The overcap 3 is a resin integrally-molded product, and includes a threaded portion 16 that is screwed into the threaded portion 8 of the base portion 9, and a rod-shaped shaft body 18 that projects from the inside of the top portion 17 along the axis AX. As a resin forming the overcap 3, a resin such as polypropylene (PP) or high density polyethylene (HDPE) is used. In order to provide rigidity, it is preferable to use a material having a high flexural modulus to form a thick wall, and it is particularly preferable to make a screw portion to which torque (load) is applied thicker than other portions.

  On the outer surface of the shaft body 18, a male screw that can be screwed with a female screw provided on the inner peripheral surface of the separating portion 12 is provided. In the state before the packaging container 5 is opened, a portion within a predetermined range from the tip of the shaft body 18 is housed inside the separation portion 12, and the male screw on the outer surface of the shaft body 18 and the female screw inside the separation portion 12 are partly formed. Are screwed together. The shaft body 18 and the separating portion 12 form a screwing structure that can be screwed with the shaft AX as a rotation shaft. However, the screwing structure formed by the shaft body 18 and the separating portion 12 has a reverse screw relationship with the screwing structure formed by the inner cap 2 and the overcap 3. Further, a sharply pointed tip portion 20 and a constricted portion 21 adjacent to the tip portion 20 are provided at the tip (lower end in FIG. 2) of the shaft body 18.

  Further, a cylindrical inner ring 19 that surrounds the shaft 18 is provided inside the top 17 of the overcap 3. The outer diameter of the inner ring 19 is set to be equal to or slightly larger than the inner diameter in the vicinity of the end 11b of the pouring portion 10 of the inner cap 2, and when the packaging container 5 is resealed after opening, Then, the inner ring 19 is fitted into the pouring portion 10 to seal the pouring portion 10.

<Opening process of packaging container>
FIG. 4 is a diagram for explaining the opening process of the cap structure according to the embodiment, and FIG. 5 is a diagram showing a state before and after the shaft body penetrates the bottom portion of the separating portion.

  First, FIG. 4A shows 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 contacts 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, neither the bridge portion 13 connecting the pouring portion 10 and the separating portion 12 of the inner cap 2 nor the thin portion 15 of the bottom portion 14 is broken, and the inner side of the inner cap 2 is sealed. It is in a state.

  Next, FIG. 4B shows a state in which the overcap 3 is rotated by a predetermined amount in the opening direction (counterclockwise direction when viewed from above the overcap 3) about the axis AX. The state before screwing of the screw part 16 and the screw part 8 of the inner cap 2 is shown.

  As described above, the screwing structure of the shaft body 18 of the overcap 3 and the separating portion 12 of the inner cap 2 is opposite to the screwing structure of the screw portion 16 of the overcap 3 and the screw portion 8 of the inner cap 2. It is a screw. Therefore, when the overcap 3 is rotated in the opening direction from the state of FIG. 4A, the screwing between the shaft body 18 and the separating portion 12 is further tightened (the tip of the shaft body 18 is moved to the bottom portion 14 of the separating portion 12). Direction of rotation).

  As the shaft 18 and the separating portion 12 are screwed together, as shown in FIG. 5A, the tip portion 20 of the shaft 18 approaches the bottom portion 14 of the separating portion 12, and the shaft 18 and the separating portion 12 move. When the screwing further proceeds, the thin portion 15 provided on the bottom portion 14 of the separating portion 12 is pierced and penetrates. Here, the diameter d of the thin portion 15 is set to be smaller than the outermost diameter D of the tip portion 20. Therefore, the tip portion 20 penetrates the bottom portion 14 while breaking the thin wall portion 15 and expanding the peripheral portion of the thin wall portion 15. Then, after the tip portion 20 has completely penetrated the thin portion 15, as shown in FIG. 5B, the opening portion formed by breaking the thin portion 15 is held by the constricted portion 21, and the tip portion The outermost diameter portion of 20 functions as a stopper. As a result, the separating portion 12 is locked (engaged) with the shaft body 18.

  In the process in which the shaft 18 and the separating portion 12 are screwed together, the separating portion 12 relatively moves toward the top 17 side of the overcap 3. When the amount of movement of the separating portion 12 toward the top portion 17 becomes a certain amount or more, the thin bridge portion 13 is broken over the entire circumference.

  If the entire circumference of the bridge portion 13 is broken before the separation portion 12 is locked by the shaft body 18, the separation portion 12 and the shaft body 18 will not be screwed together, so that the separation portion 12 and the shaft body 18 will not be advanced. The locking with and must be completed at the same time as the entire circumference of the bridge portion 13 is broken or before the breaking. The timing at which the separation portion 12 and the shaft body 18 are locked and the timing at which the entire circumference of the bridge portion 13 is broken are, for example, the breaking strength of the bridge portion 13 and the screw structure formed by the separation portion 12 and the shaft body 18. The pitch can be adjusted by the distance between the tip 20 and the thin portion 15 in the unopened state (the state where the overcap 3 is completely tightened in the inner cap 2).

  It should be noted that the thin portion 15 may be provided with a half cut or the like so that the thin portion 15 is more likely to be broken than the portion thicker than the thin portion 15 in the peripheral portion of the bottom portion 14. The half cuts may be provided radially from the center of the thin portion 15, for example.

  FIG. 4C shows a state in which the threaded portion 16 of the overcap 3 and the threaded portion 8 of the inner cap 2 are unthreaded.

  As shown in FIG. 4C, by removing the overcap 3 and pulling out the separating portion 12 locked to the shaft body 18 from the pouring portion 10, the contents of the container 4 are poured out from the pouring portion 10. be able to. Further, inserting the separating portion 12 locked by the shaft 18 into the pouring portion 10 and rotating the overcap 3 in the closing direction (clockwise direction when viewed from above the overcap 3) about the axis AX. Allows the container 4 to be resealed.

  The bridge portion 13 is preferably provided so that the difference between the outer diameter of the separation portion 12 and the inner diameter of the pouring portion 10 is as small as possible. By making the outer diameter of the separating portion 12 and the inner diameter of the pouring portion 10 substantially coincide with each other, after pouring out the contents from the pouring portion 10, the solid matter and the like attached to the inner peripheral surface of the pouring portion 10 can be removed. It is possible to scrape back into the container 4 by the separating part 12. Such a configuration is suitable for a packaging container for packaging solid contents such as chopped vegetables, herbs and spices, or gel contents.

  FIG. 6 is a diagram illustrating a part of the manufacturing process of the cap structure according to the embodiment.

  The cap structure 1 is manufactured by integrally molding the inner cap 2 and the overcap 3 with resin in separate steps, and then fitting the overcap 3 to the inner cap 2 by tapping. When fitting the overcap 3 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 inserted into the inner cap 2 in order to prevent the bridge portion 13 from breaking. And support the inner cap 2. 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. 6A, the center axis of the inner cap 2 supported by the receiving jig 23 and the center axis of the overcap 3 held by the holding jig 24 are aligned with each other, and the overcap 3 and The inner caps 2 are pressed toward each other. Due to the pressing force, the female screw passes over the male screw, and as shown in FIG. 6B, the screw portion 16 of the overcap 3 is fitted into the screw portion 8 of the inner cap 2, and the male screw of the shaft 18 is separated from the separating portion. Fits 12 female threads. Thereafter, the cap jig 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.

The number of threads of the threaded portion 8 of the inner cap 2 and the threaded portion 16 of the overcap 3 is 3 to 4 so that the inner cap 2 and the overcap 3 can be easily fitted by tapping. Preferably. The number of threads of the screw portion 8 of the inner cap 2 and the screw portion 16 of the overcap 3 can be appropriately set according to the diameter of the container.

  As described above, according to the cap structure 1 of the present embodiment, the separation portion 12 of the inner cap 2 can be poured out only by rotating the overcap 3 from the completely tightened state in the opening direction by a predetermined amount. The separated part 12 can be separated from the part 10 and opened, and the separated part 12 can be firmly locked (engaged) with the shaft body 18 of the overcap 3. Therefore, according to the present embodiment, it is possible to realize the cap structure 1 that can be easily opened and can prevent the separation portion 12 from falling off even when the overcap 3 is repeatedly opened and closed. After the use, even if the content adheres to the pouring portion 10, when the container is resealed, it is pushed back into the container 4 by the separating portion 12 fitted to the shaft body 18, so that the hermeticity and the liquid running out can be reduced. It is possible to secure the sex.

  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 Mounting part 8 Screw part 9 Base part 10 Outlet part 11a, 11b End part 12 Separation part 13 Bridge part 14 Bottom part 15 Thin part 16 Screw part 17 Top 18 Shaft 20 Tip

Claims (2)

A cap structure for sealing a container having an opening, comprising:
An inner cap attached to the opening,
An overcap screwed onto the outer peripheral surface of the inner cap by rotating about a predetermined rotation axis,
The inner cap is
A base portion having a mounting portion mounted on the container and a screw portion with which the overcap is screwed;
It has a tubular shape with the rotation axis as a central axis, and one end is connected to the base portion, and the other end is open, and a pouring portion,
A separation part provided inside the pouring part,
A bridge portion that connects the outer peripheral surface of the separating portion and the inner peripheral surface of the pouring portion over the entire circumference, and seals between the outer peripheral surface of the separating portion and the inner peripheral surface of the pouring portion. Have
The overcap is
A screw portion screwed to the base portion,
A shaft body projecting along the rotation axis from the inner portion of the top of the overcap,
The separating portion is a female screw member having a bottomed cylindrical shape having an opening on the other end side of the pouring portion and having a bottom portion on the side opposite to the opening, and having a thin wall provided on the bottom portion. Have a section,
The shaft body is a male screw member having a sharp tip and a constricted portion adjacent to the tip, the outermost diameter of the tip is larger than the outermost diameter of the thin portion,
The shaft body and the separation portion are screwable with each other about the rotation shaft, and the inner cap and the overcap have a screwing structure of a reverse screw to the screwing structure,
As the overcap is rotated in the opening direction from the state in which the overcap is screwed onto the inner cap, the shaft body and the separating portion are screwed together, and the separating portion is By moving relative to the top side, the bridge portion is broken over the entire circumference,
As the inner cap is rotated in the opening direction, screwing of the shaft body and the separating portion progresses, the tip portion of the shaft body pierces and breaks the thin portion of the separating portion, A cap structure in which the separating portion is locked to the shaft body in a state where the outermost diameter portion of the tip portion penetrates the bottom portion before the entire circumference of the bridge portion is broken. A packaging container,
A container having an opening,
The cap structure according to claim 1, which seals the opening of the container,
A packaging container, wherein an attachment portion provided on the base portion of the inner cap is attached to the opening of the container.

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