JPH10291550A - Cap made of polypropylene - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make smaller the contact area between a cap when being fitted on the mouth part and a bottle, and suppress the increase of an opening torque of the cap by a sugar concrete phenomenon by forming a plurality of grooves which are provided in parallel in the circumferential direction, on a contact slope. SOLUTION: On the inner peripheral surface of a peripheral wall 120, a crewing part 121 to be screwed with a container 200 is formed. Also, an inner ring 111 is vertically hung from the lower surface of a top plate 110, and by tightly joining the inner ring 111 to a mouth part inner peripheral surface 212 of the container 200, the container is sealed. At the same time, a contact slope 130 which is formed on the inner peripheral surface of a connecting corner part between the top plate 110 and the peripheral wall 120, is brought into contact with the outer peripheral edge of a mouth part top surface 211 of the container 200, and is pinched. In this case, on the contact slope 130, a plurality of grooves 131 which are arranged in parallel in the circumferential direction, are provided with equal intervals, and the contact area between the cap 100 and the container 200 is reduced, and thus, the increase of an opening torque due to a sugar concrete phenomenon which generates by a sugar content of a contained object, is prevented from generating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap used for contents containing sugar such as sake, and more particularly, to a cap made of polypropylene which prevents an increase in opening torque due to a sugar concrete phenomenon.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 2 (a), 2 (b) and 2 (c), a screw portion (213) (screw) is provided on an outer peripheral surface of an opening (210) for filling a liquid content. As a cap to be attached to the bottle-shaped container (200), the peripheral wall (12
0) The inner peripheral surface has a screwing portion (121) with the container (200), and when screwed into the mouth portion (210) of the container (200) and attached, it hangs on the lower surface of the top plate (110). The inner ring (111) to be provided is in close contact with the inner peripheral surface (212) of the container mouth to seal the container, and at the same time, the top plate (110) and the peripheral wall (12).
0) and a contact inclined surface (13)
There is known a cap (100) having a structure in which the outer peripheral edge of the container (0) is in contact with the outer peripheral edge of the top surface (211) of the container and is sandwiched therebetween.

[0003]

However, the above-mentioned conventional cap uses polyethylene as a material.
For contents containing sugar such as sake, especially when alcohol is contained, polyethylene may adversely affect the taste of the contents, and polypropylene that has little effect on the taste of the contents may be used. When used for materials,
Due to the so-called sugar concrete phenomenon caused by solidification of sugar, the opening torque of the cap was increased, and the cap was sometimes difficult to open. For this reason, in order to reduce the opening torque of the cap, packing in which polypropylene is applied on both sides between the cap and the mouth of the bottle has been used.

[0004] The present invention has been developed to solve the problem of the conventional cap described above, and the opening torque is small due to the sugar concrete phenomenon caused by the sugar content.
An object of the present invention is to provide a one-piece polypropylene cap which does not leak when heated with a PET bottle (a biaxially stretched blow-molded bottle using polyethylene terephthalate as a material).

[0005]

Means for Solving the Problems A first invention of the present invention is:
As shown in FIGS. 1A, 1B and 1C, the container (2)
00), an inner ring (111) closely contacting the inner surface (212) of the mouth is vertically provided on the lower surface of the top plate (110), and the container (2) is provided.
00), the contact inclined surface (130) contacting the outer peripheral edge of the mouth top surface (211) is provided on the inner peripheral surface of the connection corner between the top plate (110) and the peripheral wall (120). A cap (100) made of polypropylene, characterized in that a plurality of grooves (131) arranged in a circumferential direction are provided on an inclined surface (130).

Next, a second invention of the present invention is characterized in that the sum of the widths of the grooves is at least half the circumference of the contact inclined surface. 1 is a polypropylene cap according to the first aspect of the invention.

[0007]

The polypropylene cap of the present invention has a connection inclined surface provided on the inner peripheral surface of the connection corner between the top plate and the peripheral wall.
A plurality of grooves arranged side by side in the circumferential direction are provided, and the sum of the widths of these grooves is equal to or more than half of the circumference of the contact inclined surface. When attached to the mouth, the contact area between the cap and the bottle is smaller than that of the conventional cap, and the rise in the opening torque of the cap due to the sugar concrete phenomenon is small.

[0008] The cap made of polypropylene according to the present invention, when screwed into the mouth of the bottle, is mounted with an inner ring vertically hanging on the lower surface of the top plate which is in close contact with the inner peripheral surface of the mouth of the bottle; PET filled with sake to firmly sandwich the mouth of the bottle with the contact inclined surface provided on the inner peripheral surface of the connection corner with the outer peripheral edge of the top of the mouth of the bottle
Even if you warm with the cap attached to the mouth of the bottle,
No liquid leakage.

[0009]

Next, an embodiment of the polypropylene cap of the present invention will be described in detail with reference to the drawings. FIG. 1A is a cross-sectional view of a polypropylene cap according to one embodiment of the present invention, and FIG.
FIG. 1C is a bottom view, and FIG. 1C is an explanatory view showing a fitted state with a container. FIG. 3 is a bottom view of a polypropylene cap according to another embodiment of the present invention.

The polypropylene cap of the present invention (10
1), as shown in FIG. 1 (c), a container (200) such as a PET bottle having a threaded portion (213) on the outer peripheral surface of the mouth portion (210), and the inner periphery of the peripheral wall (120). The screwing portion (121) provided on the surface is screwed and attached, and the top plate (11
An inner ring (111) vertically hanging on the lower surface of the container (0) is tightly attached to the inner peripheral surface (212) of the mouth of the container to seal the container, and at the same time, at the connection corner between the top plate (110) and the peripheral wall (120). This is a cap having a structure in which the contact inclined surface (130) provided on the inner peripheral surface is in contact with and sandwiched by the outer peripheral edge of the mouth top surface (211) of the container. The material is polypropylene, which is produced by an injection molding method. In addition, the polypropylene is preferably soft,
A melt flow index of 7.0 to 25 and a flexural modulus of 7,000 to 12,000 kg / cm ² is used.

As shown in FIGS. 1A and 1B, in order to reduce the contact area between the cap and the bottle in order to prevent the opening torque due to the sugar concrete phenomenon due to the sugar content of the contents from increasing. , A plurality of grooves (13) juxtaposed in the circumferential direction on the contact inclined surface (130).
1) is provided. The grooves are provided at equal intervals, and as shown in FIG.
1) (60 pieces) may be provided on the contact inclined surface (130). It is preferable that the sum of the lengths of the widths of the groove portions is equal to or more than half the length of the circumference of the contact inclined surface. Also,
Fine embossing may be performed on the surface of the threaded portion.

[0012]

EXAMPLE First, the melt flow index was 7.0.
As shown in FIGS. 1 (a) and 1 (b), using a polypropylene having a flexural modulus of 7,000 kg / cm ² , as shown in FIGS. Grooves (131) are provided at regular intervals in the circumferential direction.
m caps (100) of this example were produced by injection molding. The sum of the widths of the grooves is 60% of the circumference of the contact slope. For comparison, a cap of a conventional example having the same specifications except that no groove was provided on the contact inclined surface was also manufactured at the same time.

Next, the cap of the present embodiment and the cap of the conventional example described above are separately separated from each other with PE filled with sake.
It was screwed into the mouth of the T bottle with a tightening torque of 15 kg and mounted, and after a predetermined distribution process and storage period, the opening torque was measured. As a result of the measurement, the cap of this example averaged 12 kg, and the cap of the conventional example averaged 25 kg.

Further, the PET bottle containing sake with the cap of this embodiment attached to the mouth was heated twice at 70 ° C. twice, but no liquid leak occurred. The opening torque was 7 kg on average.

[0015]

The polypropylene cap of the present invention
Even when attached to the mouth of a container filled with a content containing sugar such as sake, the opening torque increases due to the sugar concrete phenomenon, and the cap does not become difficult to open.

Further, even if the PET bottle filled with sake is warmed while attached to the mouth, no liquid leakage occurs.

Furthermore, since the cap is a one-piece cap and is made of polypropylene, it has very little adverse effect on the taste of the contents.

[Brief description of the drawings]

1A is a cross-sectional view of a polypropylene cap according to an embodiment of the present invention, FIG. 1B is a bottom view, and FIG. 1C is an explanatory view showing a fitted state with a container. It is.

FIG. 2A is a cross-sectional view of a conventional polypropylene cap, FIG. 2B is a bottom view, and FIG.
FIG. 4 is an explanatory view showing a fitted state with a container.

FIG. 3 is a bottom view of a polypropylene cap according to another embodiment of the present invention.

[Explanation of symbols]

 100 cap 110 top plate 111 inner ring 120 peripheral wall 121, 213 screw portion 130 contact slope 131 groove 200 container 210 mouth 211 Top surface 212: Inner peripheral surface

Claims (2)

[Claims] 1. An inner ring closely contacting an inner surface of a mouth of a container is vertically provided on a lower surface of a top plate, and a contact inclined surface contacting an outer peripheral edge of a top surface of the mouth of the container is formed at a connection corner between the top plate and the peripheral wall. 2. A cap provided on the inner peripheral surface of claim 1, wherein a plurality of grooves arranged in a circumferential direction are provided on said contact inclined surface. 2. The polypropylene cap according to claim 1, wherein the sum of the widths of the grooves is at least half the circumference of the contact slope.