JP5202133B2 - Bottle cap and container having the bottle cap - Google Patents

Description

  The present invention relates to a bottle cap and a container having the bottle cap.

Conventionally, as a bottle cap that closes the mouth of a bottle filled with a beverage, the bottle cap has an accommodating portion for accommodating powder or liquid raw material inside, and the accommodating portion opens and opens the raw material in the bottle with the opening operation. A bottle cap of the type that is discharged into the container is used (see Patent Document 1).
As shown in FIGS. 5A and 5B, the bottle cap 100 described in Patent Document 1 includes a parent cap 102 and a child cap 101, and the child cap 101 serves as a raw material container. An inner cylinder 101A is provided. The inner cylinder 101A is fitted with a bottom lid 103 that closes the lower opening.
By rotating the child cap 101 in the opening direction with respect to the outer cylinder (outer cylinder portion main body) 102A of the parent cap 102, the bottom cover 103 is dropped from the inner cylinder 101A by the outer cylinder 102A of the parent cap 102, and the inner cylinder 101A inside. The powder raw material is discharged into the bottle.

JP 2005-88997 A

  In such a bottle cap, the outer cylinder 102A is inserted into the bottle. In order to maintain the hermeticity of the bottle, the outer surface of the outer cylinder 102A of the bottle cap is preferably in close contact with the mouth of the bottle. However, when the bottle cap is screwed into the bottle, the outer cylinder 102A of the bottle cap is attached to the inner wall of the bottle. May be deformed or damaged by friction.

When a material having a low surface hardness is used, the outer cylinder main body (outer cylinder 102A) comes into contact with the inner wall of the bottle and is damaged or deformed. Therefore, in order to prevent the outer cylinder body from being damaged or deformed, it is necessary to increase the surface hardness of the outer cylinder body. If the surface hardness of the outer cylinder main body is increased, the resistance to the mouth of the plastic bottle is increased, and it is considered that damage and deformation can be prevented.
However, as a result of intensive studies by the present inventors, it was confirmed that deformation and damage due to friction with the inner wall of the bottle could not be prevented simply by configuring the outer cylinder main body with a material having high hardness. And it turned out that the surface hardness and bending elastic modulus of an outer cylinder part main body have had a big influence on the deformation | transformation by a friction with a bottle inner wall, and a damage. That is, it has been found that if the bending elastic modulus is increased to a predetermined value as the surface hardness is increased, damage to the outer cylinder main body cannot be prevented.

The present invention is based on such knowledge.
According to the present invention, one end surface is blocked, the other end surface is opened, an inner cylinder portion having a cylindrical accommodation portion inserted into the mouth portion of the plastic bottle, and the accommodation portion is inserted inside, An outer cylinder that has an outer cylinder body that is inserted into the mouth portion of the PET bottle, and has an outer cylinder portion that is inserted into the mouth portion of the PET bottle, and is screwed into the mouth portion of the PET bottle. And a bottom cover portion that detachably fits with the opening-side end portion and the opening-side end portion, the opening-side end portion of the outer cylinder portion main body. Projecting from the other end, screwing the inner cylinder part in the opening direction with respect to the outer cylinder part body to drive the accommodating part, and by the other end part of the outer cylinder part body, The bottom lid part is removed from the opening of the container part, and the contents in the container part are dropped into the plastic bottle. It is a torcap, and when the outer cylinder part main body of the outer cylinder part is inserted into the mouth part of the PET bottle, it contacts the inner wall of the mouth part of the PET bottle and has a bending elastic modulus (JIS K 6921- A bottle cap made of a material having 2) of 1200 MPa or less and a surface hardness (JIS K 7202 (R scale)) of 85 or more is provided.

As described above, when a material with low surface hardness is used, the outer cylinder main body comes into contact with the inner wall of the PET bottle mouth, and friction is caused by the screwing operation, resulting in damage or deformation. I'm sorry. Therefore, in order to prevent the outer cylinder body from being damaged or deformed, it is necessary to increase the surface hardness of the outer cylinder body.
However, it has been found that if the flexural modulus is increased to a predetermined value as the surface hardness is increased, damage to the outer cylinder main body cannot be prevented.
Therefore, in the present invention, the outer cylinder part body of the outer cylinder part is made of a material having a flexural modulus (JIS K 6921-2) of 1200 MPa or less and a surface hardness (JIS K 7202 (R scale)) of 85 or more. It is composed.
By configuring the outer tube body with such a material, when the outer tube portion is screwed into the mouth portion of the plastic bottle, the outer tube portion body is not in contact with the inner wall of the mouth portion of the plastic bottle. By contacting the inner wall of the PET bottle mouth, it can be prevented from being damaged or deformed.

  As a result, it is possible to provide a bottle cap that has high airtightness with respect to a PET bottle and has a good appearance.

Moreover, it is preferable that the said outer cylinder part main body of the said outer cylinder part has a polypropylene resin as a main component.
Furthermore, it is preferable that the said material which comprises the said outer cylinder part main body of the said outer cylinder part is 90 degreeC or more in heat-deformation temperature (JISK6921-2).
By constituting the outer cylinder part body with a material having a heat deformation temperature of 90 ° C. or higher, it is possible to suppress the outer cylinder part body from being deformed by frictional heat with the mouth of the plastic bottle.

In addition, it is preferable that the said inner cylinder part is comprised with the material from which surface hardness differs from an outer cylinder part main body.
By configuring the outer tube portion and the inner tube portion with materials having different surface hardness, the inner tube portion can be easily screwed into the outer tube portion main body.

  Furthermore, according to this invention, the container provided with the bottle cap mentioned above and the plastic bottle to which this bottle cap is attached is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the sealing ability with respect to a PET bottle is high, and the bottle cap which has a favorable external appearance and this bottle cap is provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, with reference to FIGS. 1-4, the outline | summary of the bottle cap 1 of this embodiment is demonstrated.
The bottle cap 1 has an inner cylindrical portion 10 having a cylindrical accommodating portion 12 which is inserted into the mouth portion 21 of the PET bottle 2 and has an inner cylindrical portion 12 which is inserted in the mouth portion 21 of the PET bottle 2. Is inserted, the inner cylinder part 10 is screwed into one end part, and the other end part has an outer cylinder part main body 13 inserted into the mouth part 21 of the plastic bottle 2, The outer cylinder part 15 screwed to the opening part 21 and the bottom cover part 16 which closes the opening of the accommodating part 12 and is detachably fitted to the end part on the opening side are provided.
The accommodating portion 12 has an opening-side end portion protruding from the other end portion of the outer cylinder main body 13. In the bottle cap 1, the inner cylinder portion 10 is screwed in the opening direction with respect to the outer cylinder portion main body 13 to drive the accommodating portion 12, and the bottom end portion 16 is driven by the other end of the outer cylinder portion main body 13. Is removed from the opening of the container 12 and the contents in the container 12 are dropped into the plastic bottle 2.
The outer cylinder part body 13 of the outer cylinder part 15 is in contact with the inner wall of the mouth part 21 of the plastic bottle 2, has a flexural modulus (JIS K 6921-2) of 1200 MPa or less, and a surface hardness (JIS K 7202) of 85. It is comprised with the material which is the above.

Next, with reference to FIGS. 1-4, the bottle cap 1 of this embodiment is demonstrated in detail.
FIG. 1 discloses a container 3 including the bottle cap 1 described above and a bottle (pet bottle) 2 to which the bottle cap 1 is attached.
The bottle 2 is filled with powder, liquid or the like. For example, the bottle 2 is filled with a beverage such as water.
The bottle 2 has a bottle main body and a mouth portion 21 provided on the bottle main body. The bottle cap 1 is screwed into the mouth portion 21. Here, the mouth portion 21 is made of amorphous polyethylene terephthalate.

The bottle cap 1 closes the mouth portion 21 of the bottle 2.
As shown in FIGS. 2 and 3, the bottle cap 1 includes the inner cylinder part 10, the outer cylinder part 15, and the bottom cover part 16 as described above.
The inner cylinder part 10 includes a lid part 11 and an accommodating part 12.
The lid portion 11 includes a top surface portion 111 that closes the mouth portion 21 of the bottle 2, and a screwing portion 112 that hangs down from the periphery of the top surface portion 111.
The top surface portion 111 has, for example, a substantially circular planar shape.
The screwing portion 112 is a peripheral wall surrounding the periphery of the top surface portion 111, and a screw is engraved on the inner peripheral surface of the peripheral wall.

The accommodating portion 12 is a cylindrical member and is inserted into the mouth portion 21 of the bottle 2. The container 12 stores a powdery or liquid raw material such as green tea (for example, green tea).
The accommodating portion 12 has a cylindrical shape, one end portion is fixed to the back surface of the top surface portion 111, and one end surface is closed by the top surface portion 111. The accommodating portion 12 and the lid portion 11 are integrally configured.
An opening is formed in the other end surface of the accommodating portion 12, and the bottom cover portion 16 is fitted into this opening. The accommodating portion 12 is inserted into the outer cylindrical portion main body 13 of the outer cylindrical portion 15, and the other end portion on the opening side of the accommodating portion 12 is exposed from the other end portion of the outer cylindrical portion main body 13.

The bottom lid portion 16 is fitted into the opening of the housing portion 12 and closes the opening of the housing portion 12. The bottom lid portion 16 is pushed into the opening of the housing portion 12, and includes a closing portion 161 that closes the opening, a peripheral wall portion 162 provided at a peripheral edge portion of the closing portion 161, a peripheral wall portion 162, and a closing portion 161. And a fitting groove 163 that is formed in between and into which the end of the accommodating portion 12 on the opening side is fitted.
The peripheral wall portion 162 is located on the side (outside) of the end portion on the opening side of the housing portion 12 when the bottom lid portion 16 is fitted into the opening of the housing portion 12, and is the end portion on the opening side of the housing portion 12. Surround the surroundings. The upper surface 162 </ b> A of the peripheral wall 162 is opposed to the lower end surface of the other end of the outer cylinder main body 13.
An upper surface 162A of the peripheral wall 162 that faces the end of the outer cylinder main body 13 is an inclined surface that is inclined downward from the inner peripheral edge side to the outer peripheral edge side of the upper surface 162A.
A ring-shaped packing P2 is installed on the inclined upper surface 162A. The upper surface of the packing P2 has the same inclination as the upper surface 162A.
The inner side surface of the peripheral wall portion 162 (the surface facing the outer surface of the housing portion 12) is composed of a vertical surface 162B and an inclined surface 162C. The vertical surface 162 </ b> B is substantially parallel to the outer surface of the housing portion 12 and contacts the outer surface of the housing portion 12 when the bottom lid portion 16 is fitted into the opening of the housing portion 12.
The inclined surface 162C is a surface inclined downward from the lower end portion of the vertical surface 162B so as to be away from the outer surface of the accommodating portion 12.

The fitting groove 163 is formed by the inner surface of the peripheral wall portion 162, the outer surface of the closing portion 161, and the connection portion 164 that connects the lower end portion of the peripheral wall portion 162 and the periphery of the closing portion 161.
On the bottom surface of the fitting groove 163 (that is, the connecting portion 164), a ring-shaped packing P1 is installed.
The bottom cover portion 16 is attached to the housing portion 12 by pushing the closing portion 161 into the opening of the housing portion 12 and fitting the end portion on the opening side of the housing portion 12 into the fitting groove 163.

The outer cylinder part 15 includes an outer cylinder part body 13 and a mounting part 14.
The outer cylinder part main body 13 is a bottomless cylindrical member.
In the outer cylinder main body 13, the lid portion 11 is screwed into one end portion, and the other end portion is inserted into the mouth portion 21 of the bottle 2.
In addition, the accommodating portion 12 is inserted into the outer cylindrical portion main body 13, and the end portion on the opening side of the accommodating portion 12 protrudes from the other end portion of the outer cylindrical portion main body 13. Most of the outer peripheral surface of the accommodating portion 12 is covered with the outer cylindrical portion main body 13, and only the end portion on the opening side of the accommodating portion 12 is exposed from the other end portion of the outer cylindrical portion main body 13.
Further, the inner peripheral surface of the outer cylinder main body 13 is in contact with the outer peripheral surface of the accommodating portion 12.
Furthermore, the end surface of the other end portion of the outer cylinder portion main body 13 faces the tip of the peripheral wall portion 162 of the bottom lid portion 16 and abuts against the packing P1.
A screw is engraved on the outer peripheral surface of one end portion of the outer tube portion main body 13 to form a screwing portion 131. The screw part 112 of the lid part 11 is screwed into the screw part 131 of the outer cylinder part main body 13.
Furthermore, when the bottle cap 1 is attached to the plastic bottle 2, the central portion of the outer peripheral surface of the outer cylinder body 13 contacts and closely contacts the inner wall of the mouth 21 of the plastic bottle 2. Of the outer peripheral surface of the outer cylinder main body 13, the central portion continuously contacts the inner wall of the mouth portion 21 of the plastic bottle 2 in a circumferential shape. The central portion is a region on the other end side of the threaded portion 131 of the outer cylinder portion main body 13 and is a portion facing a mounting portion 14 described later.

A mounting portion 14 is provided on the outer peripheral surface of the outer cylinder main body 13.
The mounting portion 14 is a cylindrical member that protrudes from the outer peripheral surface of the outer tube portion main body 13. In the present embodiment, the mounting portion 14 is provided so as to surround a substantially central portion of the outer peripheral surface of the outer tube portion main body 13, and the end surface on the mouth portion 21 side of the bottle 2 is opened.
The mounting portion 14 has a screw engraved on the inner peripheral surface, and the bottle cap 1 is mounted on the bottle 2 by screwing the screw into a screw engraved on the outer peripheral surface of the mouth portion of the bottle 2. It will be.
In the present embodiment, the mounting portion 14 is integrally formed with the outer cylinder main body 13.

Next, the material etc. of each member which comprises the above bottle caps 1 are demonstrated.
In the bottle cap 1 as described above, the inner cylinder part 10, the outer cylinder part 15 and the bottom cover part 16 all have a polypropylene resin as a main component (resin component), and a lubricant, a colorant for the resin component. Or the like is appropriately added.
Here, as the polypropylene resin, homopolypropylene, a propylene random copolymer (random polypropylene) which is a copolymer of an α-olefin monomer (ethylene or the like) and propylene, and a propylene block copolymer (block polypropylene). Can be given. As the α-olefin monomer, an α-olefin other than propylene can be used, for example, ethylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-heptene, 1-octene. Among them, ethylene and 1-butene are preferable, and ethylene is particularly preferable. In addition, an alpha olefin can be used individually or in combination of 2 or more types.

However, the outer cylinder portion 15 has a flexural modulus (JIS K 6921-2 (ISO 1873-2.2: 95)) of 1200 MPa or less and a surface hardness (JIS K 7202 (ISO 2039-2) (R scale). ) Is made of 85 or more materials.
Especially, it is preferable that a bending elastic modulus (JISK6921-2) is 1100 Mpa or less, and it is preferable that it is 800 Mpa or more from a viewpoint of ensuring rigidity.
Further, the surface hardness (JIS K 7202 (R scale)) is preferably 90 or more, and more preferably 110 or less.
Furthermore, it is preferable that the said material which comprises the outer cylinder part 15 is 90 degreeC or more in heat deformation temperature (JISK6921-2 (ISO1873-2.2: 95)), Furthermore, it is preferable that it is 100 degreeC or more.
As a resin component in the material constituting the outer cylinder part 15, for example, by using PM870A or PM870Z manufactured by Sun Allomer, the outer cylinder part 15 made of a material satisfying the above physical properties can be constituted.
In addition, the surface hardness (JIS K 7202 (R scale)) of the material which comprises the outer cylinder part 15 is lower than the surface hardness (JIS K 7202 (R scale)) of the material which comprises the PET bottle 2. FIG.
On the other hand, the inner cylinder part 10 and the bottom cover part 16 are made of a material having a surface hardness different from that of the outer cylinder part 15.

  Here, the flexural modulus is measured according to JIS K 6921-2. Specifically, it is an elastic modulus calculated from a load-deflection curve obtained in a three-point bending test. The measurement temperature is “normal temperature”, the sample shape is 80 × 10 × 4 mm, and the test condition (speed) is 2 mm / min.

  The surface hardness is measured according to JIS K 7202 and is Rockwell hardness (R scale).

Furthermore, the heat distortion temperature is measured in accordance with JIS K 6921-2.
The sample shape is 80 x 10 x 4 mm (length x height x width), a 3-point bending stress is applied at 0.45 MPa, the temperature is raised in oil at a rate of 2 ° C / min. The temperature when softening and the deflection of the load point (0.32 mm) was reached was measured.

  In addition, whether the outer cylinder part 15 is comprised from the material which has each physical property mentioned above (bending elastic modulus, surface hardness, heat deformation temperature) is for melting the outer cylinder part 15 and measuring each physical property. It can be confirmed by molding into a sample shape and measuring each physical property.

Next, a method for attaching the bottle cap 1 to the bottle 2 will be described.
First, the accommodating part 12 of the inner cylinder part 10 is inserted into the outer cylinder part main body 13 of the outer cylinder part 15. Next, the raw material is filled in the accommodating portion 12 and the bottom lid portion 16 is attached.
Thereafter, the outer cylinder main body 13 of the outer cylinder 15 is inserted into the mouth 21 of the bottle 2, and the mounting part 14 of the bottle cap 1 is screwed into the mouth 21 of the bottle 2. Thereby, the bottle cap 1 is attached to the bottle 2. When the mounting portion 14 of the bottle cap 1 is screwed into the mouth portion 21 of the bottle 2, the outer cylinder main body 13 contacts the mouth portion 21 of the bottle 2 and slides on the inner wall of the mouth portion 21 of the bottle 2. .

Next, the opening operation of the bottle cap 1 will be described.
As shown in FIG. 4, the lid portion 11 is screwed in the opening direction, that is, the upper side in FIG. 4, and the screwing between the lid portion 11 and the outer cylinder main body 13 is released. Since the lid portion 11 and the housing portion 12 are integrally formed, the housing portion 12 and the bottom lid portion 16 pushed into the housing portion 12 are moved upward as the lid portion 11 is screwed. Try to drive.
At this time, since the bottom cover portion 16 is opposed to and in contact with the end portion of the outer tube portion main body 13, the end surface of the outer tube portion main body 13 prevents the upper drive of the bottom cover portion 16, The bottom cover part 16 falls off from the housing part 12 due to the collision between the bottom cover part 16 and the end surface of the outer cylinder part main body 13.
Thereby, the raw material accommodated in the accommodating part 12 falls into the bottle 2, and will be mixed with the drink etc. with which the bottle 2 was filled.
Further, when the lid portion 11 is screwed in the opening direction, the accommodating portion 12 slides in the outer cylinder portion main body 13 toward the upper side in FIG. The bottle cap 1 is opened by removing the accommodating portion 12 from the outer cylinder portion main body 13.

Next, the effect of this embodiment is demonstrated.
The outer cylinder part body 13 of the outer cylinder part 15 is made of a material having a flexural modulus (JIS K 6921-2) of 1200 MPa or less and a surface hardness (JIS K 7202 (R scale)) of 85 or more.
By configuring the outer cylinder main body 13 with such a material, even when the outer cylinder 15 is screwed into the mouth 21 of the plastic bottle 2, the outer wall may be brought into contact with the inner wall of the mouth 21 of the plastic bottle 2. The outer cylinder body 13 can be prevented from being damaged or deformed by contacting the inner wall of the mouth 21 of the plastic bottle 2.
Accordingly, it is possible to provide the bottle cap 1 having high sealing performance with respect to the PET bottle 2 and having a good appearance.
In addition, although it is not clear how the surface hardness and the bending elastic modulus of the outer cylinder part main body 13 prevent the outer cylinder part main body 13 from being damaged and deformed, it is considered as follows.
When the outer cylinder part 15 is screwed into the mouth part 21 of the PET bottle 2, the outer cylinder part body 13 and the mouth part 21 of the bottle 2 are not simply rubbed, but the outer cylinder part body 13 is rotating while Then, the inner wall of the mouth portion 21 of the bottle 2 is slid. The outer cylinder main body 13 that moves in this way seems to be able to suppress the occurrence of scratches and deformation by being made of a material that is hard to some extent and that can be deformed to some extent.

  In addition, by configuring the outer cylinder body 13 with a material having a heat deformation temperature of 90 ° C. or higher, the outer cylinder body 13 is deformed by frictional heat with the mouth 21 of the PET bottle 2. Can be suppressed.

Furthermore, in this embodiment, the inner cylinder part 10 is comprised with the material from which the outer cylinder part main body 13 differs in surface hardness.
By configuring the inner cylinder part 10 with such a material, the inner cylinder part 10 can be easily screwed into the outer cylinder part main body 13.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
For example, in the said embodiment, although the inner cylinder part 10 was comprised with the material from which surface hardness differs from the outer cylinder part main body 13, not only this but the inner cylinder part 10 and the outer cylinder part main body 13 are the same material. You may comprise.
Furthermore, the outer cylinder part main body 13 should just be comprised with the material whose bending elastic modulus (JISK6921-2) is 1200 Mpa or less, and whose surface hardness (JISK7202 (R scale)) is 85 or more, The mounting portion 14 may be made of a material different from that of the outer cylinder main body 13.

Example 1
Next, examples of the present invention will be described.
A bottle cap 1 similar to that of the above embodiment was produced.
The outer cylinder portion 15 was made of 95 wt% polypropylene resin (PM870Z manufactured by Sun Allomer Co., Ltd.) and 5 wt% colorant.
The inner cylinder portion 10 and the bottom lid portion 16 were made of 95 wt% polypropylene resin (J706WB, J707EG manufactured by Prime Polymer Co., Ltd.) and 5 wt% colorant.
Here, the bending elastic modulus, surface hardness, and heat distortion temperature of the material of the outer cylinder portion 15 are as shown in Table 1 below.
The bending elastic modulus of the material constituting the inner cylinder part 10 and the bottom cover part 16 is 1300 MPa and 1450 MPa, the surface hardness is 90 and 95, respectively, and the thermal deformation temperatures are 105 ° C. and 105 ° C., respectively. (The measuring method of each physical property is the same as that of the outer cylinder part 15).
When such an operation of screwing the bottle cap 1 into the plastic bottle 2 and releasing the screwing was performed, the outer cylinder portion main body 13 of the bottle cap 1 was not damaged or deformed.

(Example 2)
The outer cylinder portion 15 was made of 95 wt% polypropylene resin (PM870A manufactured by Sun Allomer Co., Ltd.) and 5 wt% colorant.
The inner cylinder part 10 and the bottom cover part 16 are the same as those in the first embodiment.
Here, the bending elastic modulus, surface hardness, and heat distortion temperature of the material of the outer cylinder portion 15 are as shown in Table 1 below.
When such an operation of screwing the bottle cap 1 into the plastic bottle 2 and releasing the screwing was performed, the outer cylinder portion main body of the bottle cap 1 was not damaged or deformed.

(Comparative Example 1)
Here, the outer tube portion was 95 wt% polypropylene resin (J706WB manufactured by Prime Polymer Co., Ltd.) and 5 wt% colorant.
The other points are the same as those in the first embodiment.
Here, the bending elastic modulus, surface hardness, and heat distortion temperature of the outer cylinder part are as shown in Table 1 below.
When such an operation of screwing the bottle cap into the plastic bottle and releasing the screwing was performed, it was found that the outer cylinder portion main body of the bottle cap was damaged.

(Comparative Example 2)
Here, the outer cylinder part was made into 95 wt% of polypropylene resin (NBC03HRA made by Novatec), and 5 wt% of the colorant.
The other points are the same as those in the first embodiment.
Here, the bending elastic modulus, surface hardness, and heat distortion temperature of the outer cylinder part are as shown in Table 1 below.
When such an operation of screwing the bottle cap into the PET bottle and releasing the screw engagement was further performed, it was found that the outer cylinder portion main body of the bottle cap was damaged and further deformed.

(Comparative Example 3)
Here, the outer tube portion was 95 wt% polypropylene resin (Prime Polymer J246M) and 5 wt% colorant.
The other points are the same as those in the first embodiment.
Here, the bending elastic modulus, surface hardness, and heat distortion temperature of the outer cylinder part are as shown in Table 1 below.
When such an operation of screwing the bottle cap into the PET bottle and releasing the screw engagement was further performed, it was found that the outer cylinder portion main body of the bottle cap was damaged and further deformed.
(Comparative Example 4)
Here, the outer cylinder part was made into 95 wt% of polypropylene resin (NBC03HR made by Novatec), and 5 wt% of colorant.
The other points are the same as those in the first embodiment.
Here, the bending elastic modulus, surface hardness, and heat distortion temperature of the outer cylinder part are as shown in Table 1 below.
When such an operation of screwing the bottle cap into the PET bottle and releasing the screw engagement was further performed, it was found that the outer cylinder portion main body of the bottle cap was damaged and further deformed.

In addition, the measuring method of each physical property in Table 1 is as follows.
(Flexural modulus)
It measured based on JISK6921-2. Specifically, it is an elastic modulus calculated from a load-deflection curve obtained in a three-point bending test.
The measurement temperature is “normal temperature”, the sample shape is 80 × 10 × 4 mm, and the test condition (speed) is 2 mm / min.
(surface hardness)
It is measured according to JIS K 7202 and is Rockwell hardness (R).
(Heat deformation temperature)
It measured based on JISK6921-2. The sample shape is 80 x 10 x 4 mm (length x height x width), a 3-point bending stress is applied at 0.45 MPa, the temperature is raised in oil at a rate of 2 ° C / min. The temperature when softening and the deflection of the load point (0.32 mm) was reached was measured.

  In addition, when the outer cylinder part was melted and formed into a sample shape for measuring each physical property (bending elastic modulus, surface hardness, thermal deformation temperature) and each physical property was measured, the physical properties shown in Table 1 are shown. It was confirmed.

It is a front view which shows the container concerning one Embodiment of this invention. It is a disassembled sectional view of a bottle cap. It is sectional drawing which shows the state with which the raw material was filled in the bottle cap. It is sectional drawing which shows the state which opens a bottle cap. It is a figure which shows the conventional bottle cap.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bottle cap 2 Bottle 3 Container 10 Inner cylinder part 11 Cover part 12 Storage part 13 Outer cylinder part main body 14 Mounting part 15 Outer cylinder part 16 Bottom cover part 21 Mouth part 100 Bottle cap 101A Inner cylinder 101 Child cap 102A Outer cylinder 102 Parent Cap 103 Bottom lid 111 Top surface portion 112 Screw portion 131 Screw portion 161 Closure portion 162 Peripheral wall portion 162A Upper surface 162B Vertical surface 162C Inclined surface 163 Fitting groove 164 Connection portions P1, P2 Packing

Claims (5)

One end surface is blocked, the other end surface is opened, and an inner cylinder portion having a cylindrical storage portion inserted into the mouth portion of the plastic bottle;
The container is inserted therein, the inner cylinder part is screwed into one end part, and the other end part has an outer cylinder part body inserted into the mouth part of the plastic bottle, An outer cylinder portion screwed into the mouth portion of
The opening of the housing portion is closed, and an end on the opening side and a bottom lid portion that is detachably fitted,
As for the said accommodating part, the edge part of the said opening side protrudes from the said other edge part of the said outer cylinder part main body,
The inner cylinder part is screwed in the opening direction with respect to the outer cylinder part main body to drive the accommodating part, and the bottom end part of the accommodating part is A bottle cap that removes from the opening and drops the contents in the container into the plastic bottle,
When the outer cylinder part main body of the outer cylinder part is inserted into the mouth part of the PET bottle, it contacts the inner wall of the mouth part of the PET bottle and has a flexural modulus (JIS K 6821-2) of 1200 MPa or less. A bottle cap made of a material having a surface hardness (JIS K 7202 (R scale)) of 85 or more. The bottle cap according to claim 1,
The outer cylinder part main body of the outer cylinder part is a bottle cap whose main component is a polypropylene resin. The bottle cap according to claim 1 or 2,
The said material which comprises the said outer cylinder part main body of the said outer cylinder part is a bottle cap whose heat-deformation temperature (JISK69211-2) is 90 degreeC or more. The bottle cap according to any one of claims 1 to 3,
A bottle cap filled with powder in the housing portion.   A container comprising the bottle cap according to claim 1 and a plastic bottle to which the bottle cap is attached.

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