JPH031366Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a sealed container having a paper container body with excellent pressure resistance and suitable for filling and sealing a carbonated beverage whose internal pressure is constantly high.

(Prior Art) In recent years, fluid-tight containers using paper container bodies, such as composite cans, have been widely used due to resource conservation and waste disposal issues. For this kind of thing, the 6th
As shown in the figure, the structure for attaching the metal container lid a to the paper container body b is similar to the conventional metal can body.
This is done by double seaming around the edge of the opening. However, unlike a metal body, the paper container body b lacks extensibility, so when it is rolled up, the folded part d of the folded flange part c hardens, and the seaming wall part e and chuck wall part f of the container lid a harden. If the pressure in the container body b is high, the container lid will break at the part compressed by the folded part d or the seaming wall part e and the chuck wall part f. A sometimes came off.

For this reason, it could not be used as a container for carbonated beverages that require a pressure resistance of 10 kg/cm ² .

Further, as shown in Figure 7, the lid flange g of the container a is bent and fitted onto the outer peripheral surface of the opening of the paper container body b, and the inner peripheral surface of the opening and the lid flange g are bonded. It is known that it was covered. however,
With such a structure, when a fluid with high internal pressure such as carbonated drinks is stored, even if the adhesive is strong, pressure is applied to push up the panel part h of the container lid a, so the adhesive will not adhere. A force is generated to push open the space between the inner surface of the opening of container body b and the lid flange g of container lid a, and therefore it is difficult to adhere container lid a to container body b in a manner that can withstand the internal pressure. It was hot.

On the other hand, a structure in which a container lid is attached to a metal container body by adhesive instead of a paper container body is disclosed in Japanese Patent Laid-Open No. 57
-86450, JP-A-58-61936, etc., the peripheral edge of the container lid is fitted to the outer peripheral surface of the opening of the metal container body, and the outer peripheral surface and the inner surface of the inner edge of the container lid are connected. There is one with the . however,
When adopting such a structure for a paper container body,
Since the open edge of the paper container body is exposed inside the container, it is constantly in contact with the liquid stored in the container.
This was unsuitable because the liquid penetrated the paper structure of the container body through the opening edge and swelled, causing delamination and weakening the bonded portion of the container body.

For this reason, the applicant has proposed a structure in which the peripheral edge of the container lid is fitted and adhered to the inner surface of the opening of the container body (Japanese Patent Application No. 111086/1986). When such a structure is adopted, the opening edge of the container body is disposed outside the container body, and the opening edge does not come into contact with the liquid content, which eliminates the above-mentioned disadvantages. Improves pressure resistance. However, as a result of further investigation, we found that with this structure, if the internal pressure is constantly high and the pressure resistance of the container body itself is not necessarily sufficient, the container body expands outward due to the internal pressure and fits into the inner surface of the opening. The container body separates from the periphery of the container lid that has been applied, and a force is generated that causes the adhesive to peel off, and as a result, there is a risk that the container lid may separate from the container body due to internal pressure.

(Problems to be solved by the invention) The present invention solves this inconvenience, and the paper container body has excellent pressure resistance and the joint between the container body and the container lid is strong even under constant high internal pressure. To provide a sealed container having:

(Means for solving the problem) The sealed container having a paper container body of the present invention solves the above problem, and the opening of the paper container body whose inner surface is waterproofed is sealed with a container lid. In this case, a peripheral wall part is formed in a hanging state around the entire circumference of the panel part of the container lid, and the opening edge of the container body is covered with a covering member, and an opening is provided on the entire inner peripheral surface of the opening part. A reinforcing member having a shape matching the cross-sectional shape of the container is provided by adhesion, the peripheral wall of the container lid is fitted onto the container body, and the reinforcing member is pressed and bonded at a corresponding position.

(Example) A further detailed description will be given below with reference to FIGS. 1 and 2 showing an example of implementation of the present invention.

1 is a paper container body, which is a conventional composite container body such as a spiral, convolute, or single wall; the shape of the container body 1 may be any shape such as a cylindrical body or a rectangular cylindrical body. .

As shown in the second figure, the inner and outer surfaces of the container body 1 are coated with a metal ion-crosslinked polyolefin resin (ionomer resin) or a polyolefin resin containing polar groups such as carboxyl groups on the surface of an aluminum foil 2, as shown in the second figure. A film coated with a thermoplastic resin 3 having good thermal adhesion to metal is provided for waterproofing. The container lid 4 is made of aluminum or a metal material coated with a thermoplastic synthetic resin film, and is used as a top lid 4a with a spout and a bottom lid 4b in the case of a bottle-shaped container as shown in the first diagram. 4a and 4b have the same structure for joining with the container body 1.

The above structure is not different from the conventional one, but in the present invention, the container lids 4a and 4b are integrated into a cup-shaped bottomed cylindrical body with a peripheral wall 6 hanging down around the entire circumference of the panel part 7. It was formed in Both container lids 4a and 4b are constructed by fitting the peripheral wall 6 of the container lids 4a and 4b onto the outer peripheral surface of the opening 5 of the container body 1, as shown in the first figure. Therefore, container body 1
Since the edge of the opening will be exposed to the liquid when it is filled with the liquid contents, the edge was covered and bonded with a synthetic resin film as the covering member 8 in advance for waterproof treatment.

Furthermore, the peripheral wall portions 6 of the container lids 4a and 4b fitted onto the outer circumferential surface of the opening 5 of the container body 1 are pressed against the outer circumferential surface and sealed by adhesion.
Since it is made of paper, it may not be able to resist the pressing force when bonding while pressing. A ring-shaped reinforcing member 9 made of synthetic resin such as high-density or medium-density polyethylene and capable of being incinerated was bonded to the reinforcing member 9. Then, the peripheral wall portions 6 of the container lids 4a, 4b were adhered to the outer peripheral surface of the opening 5 at positions corresponding to the reinforcing members 9.

Reference numeral 10 denotes a coating layer made of the heat-weldable synthetic resin that is integrally formed on the inner surfaces of the container lids 4a and 4b, and is used for adhering the peripheral wall portion 6 and the outer peripheral surface of the opening 5 of the container body 1.

With the above structure, even if a carbonated beverage that generates a high internal pressure is filled and sealed, and a force is applied to the container body 1 to expand due to the internal pressure, the inner surface of the peripheral wall 6 of the container lids 4a, 4b and the opening of the container body 1 will be prevented. No force is generated between the outer peripheral surface of the panel portion 5 and the outer peripheral surface of the panel portion 5 to cause them to separate from each other.On the contrary, as the panel portion 7 expands, a force is generated in a direction that tightens the peripheral wall portion 6, and a shearing force is simply generated at the joint between the two parts. Since this only occurs, the joint will not be destroyed even by constantly high internal pressure, and the pressure resistance will be improved.

FIG. 3 shows another embodiment of the present invention,
The edge of the opening 5 of the container body 1 is formed integrally with a covering member 8 and a reinforcing member 9 shown in FIG. 2 for waterproofing. In this embodiment, a shoulder portion 11 is connected to the upper edge of the reinforcing member 9 and covers the opening edge;
Furthermore, the reinforcing member 9 is adhered to the inner surface of the panel portion 7 of the container lids 4a, 4b, and the container body 1 is attached together with the container lids 4a, 4b.
A joining piece 12 that allows the reinforcing member 9 to fit inside the inner peripheral surface of the opening 5 is integrally formed. The joint piece 12 is provided with a force that causes the reinforcing member 9 to separate from the inner peripheral surface of the opening 5 of the container body 1 when the panel portion 7 of the container lid 4a, 4b expands outward due to internal pressure. It has a bent portion 13 that provides a hinge effect to prevent the bending from occurring.

Reference numeral 14 denotes a guide surface for attaching the reinforcing member 9 to the inner surface of the container lids 4a, 4b in advance. Other than the above configuration, this embodiment is the same as the previous embodiment.

According to the above structure, by fitting and bonding the reinforcing member 9 to the inner peripheral surface of the opening 5 of the container body 1, the opening edge covering member can simultaneously isolate the opening edge from the contents. 8.

4 and 5 show a modification of the embodiment shown in FIG. 3. In order to waterproof the edge of the opening 5 of the container body 1 with the reinforcing member 9, the shoulder 11 of the reinforcing member 9 is A continuous piece 11a is formed along the outer circumferential surface of the opening 5 extending downward from the outer upper end, and the edge of the opening 5 is fitted into the groove below the shoulder 11 formed as a result. It is coated. As shown in Figure 5,
The length of the continuous piece 11a is determined by determining the length of the peripheral wall 6 of the container lid 4a, 4b.
When it is formed to have substantially the same length as , the joint portion with the peripheral wall portion 6 can be further reinforced.

In the above modifications shown in FIGS. 3 to 5, the reinforcing member 9 integrally formed with the covering member 8, that is, the shoulder portion 11, protects the edge of the opening 5 of the container body 1 from the liquid content in the container. It can be isolated from objects and can prevent the container body 1 from weakening due to liquid penetration from the edge.

In the embodiment described above, the container body 1, the container lids 4a, 4
(b) Since both the covering member 8 and the reinforcing member 9 are made of a material that can be incinerated, the container can be incinerated and easily disposed of after use.

(Effects of the Invention) As is clear from the above description, the present invention includes forming a peripheral wall part in a hanging state around the entire circumference of the panel part of the container lid, and covering the opening edge of the container body with a covering member. , A reinforcing member having a shape matching the cross-sectional shape of the opening is attached and attached to the entire circumferential surface of the opening, the peripheral wall of the container lid is fitted onto the container body, and the reinforcing member is pressed and bonded at the corresponding position. Therefore, even when a carbonated beverage that generates a high internal pressure is filled and the container body tries to expand due to the internal pressure, there is a conventional gap between the peripheral wall of the container lid and the outer peripheral surface of the opening of the container body. To provide a sealed container having a paper container body which improves the pressure resistance of a joint of a container lid and can withstand long-term storage by generating a tightening force instead of a separating force. I can do it.
In addition, the peripheral wall of the container lid is pressed and bonded to the entire circumference of the opening of the container body in a position corresponding to the reinforcing member having a shape that matches the cross-sectional shape of the opening. is strong, and the inner peripheral surface of the opening is supported by a reinforcing member, so even though the container body is made of paper, it can be joined without destroying the container body, and has excellent sealing properties. This has the effect of providing a sealed container having a container body.

[Brief explanation of drawings]

Figures 1 and 2 show an example of the implementation of the present invention; Figure 1 is a partially cutaway view, Figure 2 is a partially enlarged view of Figure 1, and Figure 3 is another embodiment of the invention. FIGS. 4 and 5 are partially enlarged views similar to FIG. 2 showing an example, FIGS. 4 and 5 are partially enlarged views similar to FIG. FIG. 2 is a partially enlarged cross-sectional view of a conventional product. DESCRIPTION OF SYMBOLS 1... Paper container body, 4... Container lid, 5... Opening part, 6... Peripheral wall part, 7... Panel part, 8... Covering member, 9... Reinforcement member.

Claims (1)

[Scope of utility model registration request] In a case where the opening of a paper container body whose inner surface is waterproofed is sealed with a container lid, a peripheral wall portion is formed in a hanging state around the entire circumference of the panel portion of the container lid,
The edge of the opening of the container body is covered with a covering member, and a reinforcing member having a shape that matches the cross-sectional shape of the opening is bonded to the entire inner peripheral surface of the opening, and the peripheral wall of the container lid is attached to the container body. What is claimed is: 1. A sealed container having a paper container body, which is fitted onto the outside of the container body and is pressed and bonded at a corresponding position on a reinforcing member.