JP2024034743A - cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate closing an upper lid of a cap while having an effect of preventing liquid leakage by absorbing a variation in a designed dimension of the cap.

SOLUTION: There is provided a cap 1 including a cap body 20 provided at a mouth of a container 2 and having a cylindrical spout 22 for discharging contents, and an upper lid 10 having a sealing protrusion 12 that fits into the spout 22. An inner diameter of the spout 22 decreases continuously or intermittently from a tip toward a base, and an outer diameter surface of the sealing protrusion 12 has an outer diameter smaller than an inner diameter on the tip side of the spout 22 and has a shape that can fit with the inner diameter surface on the base side of the spout 22. An endless groove 23 surrounding the spout 22 is formed at the cap body 20, and a depth of the groove 23 is such that the cap body 20 is deformed at a position of the groove 23 due to a load applied to the spout 22 and the spout 22 can be displaced toward the container 2 side.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention is a closure device that is installed at the mouth of a container such as a pouch containing contents such as liquid or powder, and seals the mouth of the container so that the mouth can be opened and closed, and is used to pour out the contents. This technology relates to a cap having a spout (flow path) consisting of a spout or tube for the purpose of pouring. The present invention is a technique particularly effective for hinge caps.

An example of a cap provided at the mouth of a container is the hinge cap described in Patent Document 1. This cap includes a cap body provided at the mouth of the container and an upper lid. A cylindrical spout is formed in the center of the cap body. Further, the upper lid has a cylindrical sealing protrusion (plug) that can be press-fitted into the spout. Then, by inserting the sealing protrusion into the spout and closing the top cover, the sealing protrusion is press-fitted so that the entire outer diameter surface of the sealing protrusion is in contact with the entire inner diameter surface of the spout, thereby creating a sealed state. Configure.

JP 2016-69019 Publication

Here, when the cap is made of resin, the cap is generally molded by injection molding. When incorporating molding variations into the design, it is important to ensure that the sealing protrusion fits securely into the spout, and in other words, prevents leakage, regardless of the maximum or minimum tolerance, depending on the shape of the cap. Design so that As a premise of this design, conventionally, a fitting design with an excessive interference margin has been required.
However, there is a problem in that as the tightness of the fitting of the cap increases, the force required to press the top lid by hand to close the top lid increases. That is, when trying to create a cap structure that can be sealed more reliably, there is a problem that the cap becomes difficult to close.

The present invention was made with attention to the above-mentioned points, and an object of the present invention is to make it easier to close the top lid of the cap while absorbing variations in the design dimensions of the cap and having the effect of preventing liquid leakage. There is.

In order to solve the problem, one aspect of the present invention is to provide a container having a cylindrical spout for discharging the content, which is provided at the mouth of a container containing movable contents such as liquid or powder. A cap comprising a resin cap body and an upper lid having a sealing protrusion that fits into the spout by being inserted into the spout and can seal the spout, the cap comprising: a cap body made of resin; The inner diameter of the spout becomes smaller continuously or intermittently from the tip toward the base, and the outer diameter of the sealing protrusion has an outer diameter smaller than the inner diameter of the spout on the tip side. The cap body is small and has a shape that can be fitted with the inner diameter surface on the base side of the spout, and the cap body has an endless ring surrounding the spout on the surface on the side where the contents are discharged by the spout. A shaped groove is formed, and the depth of the groove is such that the cap body is deformed at the groove position due to the load applied to the spout when the sealing protrusion is fitted into the spout. The spout has a depth that allows it to be displaced toward the container.

According to one aspect of the invention, even if the intersection of the fitting portions reaches the lower limit in the initial design, for example, the liquid leakage prevention effect can be obtained by the effect of moving the fitting position due to the load on the top lid. That is, according to one aspect of the present invention, the upper lid of the cap can be easily closed while having a sufficient effect of preventing liquid leakage.

FIG. 2 is a cross-sectional view showing a cap structure according to an embodiment of the present invention. It is a top view of a cap main body concerning an embodiment based on the present invention. It is a sectional view explaining the liquid leakage prevention effect of the cap concerning an embodiment based on the present invention. It is a sectional view explaining the structure of the fitting part of the cap of other examples. FIG. 7 is a plan view showing another example of an annular groove.

Next, embodiments of the present invention will be described with reference to the drawings.
This embodiment will be described assuming a cap that can be applied as a spout attached to the mouth of a pouch (container). It is assumed that contents such as liquid and powder are stored in the pouch. However, the present invention is applicable even if the container is in the form of a blow bottle, bottle, or the like.

(composition)
As shown in FIG. 1, the cap 1 of this embodiment includes a cap body 20 that is attached to the mouth of the container 2, and an upper lid 10. In this embodiment, a hinge cap structure in which the cap body 20 and the upper lid 10 are connected by a hinge portion 30 will be described as an example. The cap 1 of the present invention is not limited to a hinge cap, but can also be applied to a cap in which the cap body 20 and the upper lid 10 are separated.
The cap 1 of this embodiment is an article manufactured by injection molding from a resin material such as PP, PE, or polylactic acid.

<Cap body 20>
In the cap body 20, a cylindrical portion 25 and a top plate portion 21 that covers an upper end portion of the cylindrical portion 25 are integrally molded.
<Cylinder part 25>
The cylindrical portion 25 constitutes a portion connected to the mouth of the container 2. The cylindrical portion 25 has a cylindrical shape, for example, and has a mounting portion on its inner diameter surface for attachment to the mouth of the container 2.
<Top plate part 21>
The top plate portion 21 includes a spout 22 opening at the center and a flat portion forming the outer periphery of the spout 22.
The outer edge portion of the top plate portion 21 is integrally connected to the upper end of the cylindrical portion 25. A step portion 24 that fits into the outer circumferential portion of the upper lid 10 is formed on the upper surface of the outer circumferential side of the top plate portion 21 .

[Spout 22]
The spout 22 has a cylindrical shape that opens at the center of the top plate part 21 with its central axis facing the thickness direction of the top plate part 21, and projects upward from the upper surface of the flat part. Note that the spout 22 may not be located at the center of the top plate portion 21, but may be formed eccentrically at a position away from the hinge portion 30, for example.
Here, in the thickness direction of the top plate portion 21, the tip of the spout 22 is formed at approximately the same position as the flat portion, but the tip protrudes upward. The tip of the spout 22 may be formed higher on the side opposite to the hinge.

Further, an annular projecting portion 22B is formed on the inner diameter surface of the spout 22 on the root side. The annular projecting portion 22B is an annular tongue projecting from the entire circumference of the inner diameter surface of the base of the spout 22 toward the center of the spout 22. In this embodiment, the annular projecting portion 22B has a disk shape when viewed from above, and has a plate shape that is thinner than the thickness of the cylindrical portion 25 of the spout 22.
Note that the tip portion 22Ba of the projecting portion 22B constitutes a fitting portion that fits into the outer diameter surface of the sealing protrusion 12.
As shown in FIG. 1, the upper surface of the annular projecting portion 22B is an inclined surface that is inclined in the direction toward the container 2 from the base side to the tip side of the projecting portion 22B.
In addition, in the cap main body 20, the upper direction is the direction toward the upper lid 10 side.

Here, the inner diameter of the spout 22 is larger than the diameter of the outer diameter surface of the sealing protrusion 12. The inner diameter of the spout 22 may have a shape that increases in diameter from the base side toward the tip, or may have a shape that decreases in diameter from the base side toward the tip. However, in this example, the inner diameter of the spout 22 is larger than the diameter of the outer diameter surface of the sealing protrusion 12.
In this embodiment, by having the annular projecting portion 22B, the inner diameter surface of the spout 22 has a shape that becomes smaller continuously or intermittently from the tip toward the base. That is, the inner diameter surface of the spout 22 has a cylindrical shape with the same diameter from the tip to the annular overhang 22B, and the diameter becomes smaller at the annular overhang 22B.

[Groove 23]
Further, in the cap body 20, an endless groove 23 surrounding the spout 22 in a plan view is formed on the surface on the content discharge side of the spout 22, that is, the upper surface 21a. In this embodiment, the endless groove 23 has an annular shape concentrically centered around the spout 22, as shown in FIG.
The depth of the groove 23 is determined by the load applied to the spout 22 when the upper lid 10 is pressed and the sealing protrusion 12, which will be described later, is fitted into the spout 22. On the side, the cap main body 20 is deformed downward to a depth that allows the spout 22 to be displaced toward the container 2 side.
For example, although it depends on the material of the resin constituting the cap body 20, the depth of the groove 23 is, for example, 40% or more and 60% or less of the thickness of the cap body 20 at the position where the groove 23 is formed.
As a result, the groove 23 is formed in a flat portion.

<Top lid 10>
The upper lid 10 includes a lid main body 11 and an upper lid cylindrical portion 13.
The upper lid cylindrical portion 13 has a cylindrical shape. A step portion 13 a that can fit into the step portion 24 of the cap body 20 is formed at the lower end of the upper lid cylindrical portion 13 . By fitting the stepped portion 13a of the upper lid 10 into the stepped portion 24 of the cap main body 20, the upper lid 10 is positioned with respect to the cap main body 20.
In addition, the lid body 11 is a plate-shaped member that corresponds to the cap body 20 in the thickness direction in the sealed state (the lid closed state) shown in FIG. A sealing protrusion 12 protrudes.

The sealing protrusion 12 is a rod whose outer diameter surface is a cylindrical surface. However, the tip of the sealing protrusion 12 has a shape whose diameter decreases toward the tip, so that the sealing protrusion 12 can be easily inserted into the spout 22. Note that the sealing protrusion 12 has a bottomed hole opening therein, thereby reducing the weight of the cap 1 and imparting elasticity to the sealing protrusion 12 in the radial direction.
As described above, the outer diameter of the sealing protrusion 12 is smaller than the inner diameter of the main body of the spout 22, but larger than the diameter of the space formed by the tip of the annular overhang 22B. The lower part of the sealing protrusion 12 and the tip of the annular projecting part 22B constitute a fitting part that performs sealing to prevent the contents of the container 2 from being discharged.

(Other operations)
In the present embodiment, the upper lid 10 is rotated about the hinge portion toward the top plate portion 21 of the cap body 20 by manually operating the upper lid 10 from the open state of the cap body 20. Then, the tip side of the sealing protrusion 12 is inserted into the spout 22. At this time, as the upper lid 10 is rotated in the closing direction, the axis of the sealing protrusion 12 changes from being inclined to the axis of the spout 22 to being coaxial with the spout 22, and the sealing protrusion 12 12 is inserted into the spout 22, but since the outer diameter of the sealing protrusion 12 is smaller than the spout 22, the sealing protrusion 12 is inserted into the spout 22 with a light force. In addition, since the overhanging portion 22B is more likely to displace than the spout 22 when the top lid 10 is closed, having the overhanging portion 22B makes it easier to fit the top lid 10 more strongly. This has the effect of making it difficult to cause an increase in

Furthermore, when the upper lid 10 is turned in the closing direction, the tip side of the sealing protrusion 12 is inserted into the space formed at the tip of the annular overhang 22B, and the sealing protrusion 12 and the annular overhang are inserted. The distal end of the portion 22B is fitted, and the spout 22 is in a sealed state (FIG. 3).
During this fitting, by pressing the top lid 10 in the closing direction, as the sealing protrusion 12 moves toward the container 2, the spout 22 is displaced downward around the groove position MP surrounding the spout 22. do. That is, when a load is applied to the top lid 10 in the closing direction, the opening of the groove 20 is displaced in the direction of widening, and the portion surrounded by the groove 20, particularly the spout 22, is displaced downward (towards the container). Then, the stepped portion 13a on the outer periphery of the upper lid 10 fits into the stepped portion 24 of the cap body 20, and the upper lid 10 is positioned at the closed position, and the lid body 11 of the upper lid 10 is stopped from being pressed in the closing direction. Then, the spout 22, which has been displaced downward around the groove position MP, exerts a force on the annular projecting portion 22B to move upward due to the restoring force caused by the displacement. As a result, the mating force acting on the mating portion increases, and even if the design intersection of the mating portion is at the lower limit, the necessary mating force can be obtained and fluid leakage can be prevented. It becomes possible to prevent this.

In particular, since the annular projecting portion 22B is inclined downward toward the center, it is easy to insert the sealing protrusion 12, and the positive fitting effect due to restoring force acts more effectively.
As a result, in this embodiment, the upper lid 10 of the cap 1 can be easily closed while absorbing variations in the design dimensions of the cap and having the effect of preventing liquid leakage.
Further, as described above, the upper surface of the annular projecting portion 22B is inclined downward toward the center, so the sealing projection 12 is inserted into the hole formed by the projecting portion 22B of the spout 22. This makes it easier to pour the spout, and prevents the contents that have moved to the upper side of the spout 22 from accumulating on the upper surface of the annular projecting portion 22B.

(Modified example)
(1) As shown in FIG. 4, instead of providing the annular projecting portion 22B, the inner diameter of the root side of the spout 22 itself is made smaller than the outer diameter of the sealing protrusion 12, and the spout 22 is A configuration may be adopted in which the base side fits into the sealing protrusion 12. In this case, the spout 22 has a shape in which the diameter decreases continuously from the tip toward the base.
Even the structure shown in FIG. 4 has the effect of preventing liquid leakage due to the grooves 23.
However, the annular projecting portion 22B allows the pressing force to be set smaller when closing the lid.

(2) Furthermore, as shown in FIG. 5, the groove 23 may not be formed in a part of the annular groove 23 in the extending direction. Reference numeral 21b indicates a portion where the groove 23 is not formed.
If the spout 22 can be displaced downward around the groove 23 position when the sealing protrusion 12 is pushed into the spout 22, even if the spout 22 has a portion 21b without the groove 23 as shown in FIG. good.

(others)
The present disclosure can also take the following configuration.
(1) A cap body made of resin and having a cylindrical spout for discharging the contents, which is provided at the mouth of a container containing movable contents such as liquid or powder;
an upper lid having a sealing protrusion that can be inserted into the spout and fit into the spout to seal the spout;
A cap comprising:
The inner diameter of the spout decreases continuously or intermittently from the tip toward the base,
The outer diameter of the sealing protrusion has an outer diameter smaller than the inner diameter of the tip of the spout, and has a shape that allows it to fit with the inner diameter of the base of the spout. ,
The cap body has an endless groove surrounding the spout formed on the side of the content discharge side of the spout,
The depth of the groove is such that the cap body is deformed at the groove position due to the load applied to the spout when the sealing protrusion is fitted into the spout, and the spout moves toward the container. The depth is adjustable.
(2) The depth of the groove is 40% or more and 60% or less of the thickness of the cap body at the groove forming position.
(3) The endless groove has no grooves at one or more positions along the extending direction, and the grooves are formed intermittently.
(4) The cap body has a flat part on the outer periphery of the spout, and the groove is formed in the flat part.
(5) The spout has an annular overhang that extends from the entire circumference of the inner diameter surface on the base side toward the center of the spout, and the tip of the overhang is connected to the sealing protrusion. It has a shape that performs the above-mentioned fitting with the outer diameter surface.
(6) The upper surface of the annular overhang is an inclined surface that is inclined in the direction toward the container as it goes from the root side to the tip side of the overhang.
(7) The cap in which the cap body and the upper lid are connected by a hinge is a hinge cap.

1 Cap 2 Container 10 Upper lid 11 Lid body 12 Sealing protrusion 13 Upper lid cylindrical portion 20 Cap body 21 Top plate portion 22 Spout 22B Overhang portion 23 Groove 25 Cylindrical portion 30 Hinge portion

Claims (7)

A cap body made of resin and having a cylindrical spout for discharging the contents, which is provided at the mouth of a container storing movable contents;
an upper lid having a sealing protrusion that can be inserted into the spout and fit into the spout to seal the spout;
A cap comprising:
The inner diameter of the spout decreases continuously or intermittently from the tip toward the base,
The outer diameter of the sealing protrusion has an outer diameter smaller than the inner diameter of the tip of the spout, and has a shape that allows it to fit with the inner diameter of the base of the spout. ,
The cap body has an endless groove surrounding the spout formed on the side of the content discharge side of the spout,
The depth of the groove is such that the cap body is deformed at the groove position due to the load applied to the spout when the sealing protrusion is fitted into the spout, and the spout moves toward the container. It has a variable depth,
A cap characterized by: The depth of the groove is 40% or more and 60% or less of the thickness of the cap body at the groove formation position,
The cap according to claim 1, characterized in that: The endless groove has no groove at one or more positions along the extending direction, and the groove is formed intermittently.
The cap according to claim 1, characterized in that: The cap body has a flat part on the outer periphery of the spout, and the groove is formed in the flat part.
The cap according to claim 1, characterized in that: The spout has an annular protrusion that protrudes from the entire circumference of the inner diameter surface on the base side toward the center of the spout, and the tip of the protrusion extends from the outer diameter surface of the sealing protrusion. and has a shape that performs the above fitting,
The cap according to claim 1, characterized in that: The upper surface of the annular overhang is an inclined surface that is inclined in the direction toward the container as it goes from the base side to the tip side of the overhang.
The cap according to claim 5, characterized in that: The cap according to claim 1, wherein the cap body and the upper lid are connected by a hinge.

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