JP2002001893A - Container structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container structure constituted so that a fluid such as water or the like is prevented from infiltrating into the gap between a plastic film and a container main body comprising a pulp mold. SOLUTION: The container structure consists of a container main body comprising a paper material such as a pulp mold or the like having air permeability and the plastic film closely bonded to the inner surface of the container main body by vacuum forming a skin pack or the like. The plastic film exceeds the leading end of the flange of the container main body to be bonded to the rear surface of the flange, and at least a part of the end of the plastic film is not bonded to be separated from the container main body to extend as a peeling projected piece. By pulling the projected piece, the plastic film is peeled from the container main body to fractionate the plastic film and the container main body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a container structure in which a plastic film is covered in a gas-permeable container body without gaps.

[0002]

2. Description of the Related Art Pulp molds have relatively high mechanical strength and good elasticity, and have good impact resistance. Therefore, pulp molds have recently been used as packaging materials for various products such as raw eggs, or as containers. , Has been used extensively.
Further, since the pulp mold is made of pure pulp, there is an advantage that the product to be stored can be buried or incinerated as it is after the product to be stored is taken out. However, since this pulp mold has no water resistance, it is a product that is sensitive to moisture,
It is essentially unsuitable for packaging and storing wet or liquid products. Therefore, it cannot be used for packaging and storing such products, and the use of packaging and storage containers using this pulp mold has been limited.

In order to impart water resistance to the pulp mold, it is conceivable to coat the inner surface of the pulp mold packaging or storage container with a water-resistant plastic material or impregnate the pulp mold with the water-resistant plastic material. In this case, however, it is difficult to separate only the water-resistant plastic material from the container body, so that it is impossible to take out the stored product and then incinerate it as it is or recycle it again.

Therefore, the present applicant has already disclosed in Japanese Patent Laid-Open No. 10-2
According to No. 18152, a container body made of a breathable paper material,
A structure of a container comprising a plastic film which covers the inner surface of the container body along the inner surface of the container body without any gap by vacuum forming such as a skin pack or the like has been proposed, and has a corresponding effect.
The present applicant has further studied and developed a container in which a fluid such as water does not easily enter between the plastic film and the container body, and as a result, has developed the present invention.

[0005]

That is, an object of the present invention is to bond a plastic film by folding it back at a flange of a container body and to separate the ends without bonding, thereby forming a water layer between the plastic film and the container body. It is an object of the present invention to provide a container structure in which a fluid such as the above does not permeate.

[0006]

In order to solve the above problems, according to the first aspect of the present invention, there is provided a container body made of a permeable paper material and provided with a flange on an outer periphery, and an inner surface of the container body. A plastic film adhered by vacuum forming such as a skin pack, and the plastic film is adhered to the flange back surface beyond the flange tip of the container main body, and at least a part of the end is not adhered to the container main body. It can be separated and extended as a protruding piece for peeling, and the plastic film can be peeled off from the container body by pulling the protruding piece to separate them.
It has taken the technical measures.

According to the second aspect of the present invention, there is provided a technical means in which the flange extends annularly and substantially horizontally along the outer periphery of the container body. In the invention of claim 3,
A technical measure is taken that the protruding piece is formed at a part of the end of the plastic film. In the invention of claim 4, the breathable paper material is made of pulp mold,
It has taken the technical measures. Further, in the invention of claim 5, a technical means is provided in which the plastic film is bonded to the middle of the rear surface of the flange beyond the front end of the flange of the container body. Claim 6
In the invention of (1), a technical measure is taken that the plastic film covers the entire back surface of the flange of the container body and is adhered to a part of the outer peripheral wall of the container body. In the invention of claim 7, a technical measure is taken that the plastic film is made of a water-impermeable polyolefin film.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment in which the container structure of the present invention is applied to a paper waterproof container will be described below with reference to the drawings. Here, FIG. 1 is a perspective view showing an example of a paper waterproof container, and FIG. 2 is an enlarged sectional view of a main part.

The water-resistant paper container 1 shown in FIGS.
A container body 2 made of a box-shaped air-permeable paper material having an open upper surface, for example, a pulp mold, and a moisture-impermeable plastic film 4 formed so as to substantially conform to the inner surface shape of the container body 2 Become. That is, the container body 2
Is formed from, for example, a pulp mold having an average thickness of about 1 mm, and a flange 5 extending substantially horizontally is formed continuously along the outer periphery of the pulp mold.

In the container body 2, the waste paper is mixed and defibrated in a dry state, water and an elastic adhesive are added to the defibrated waste paper, and the defibrated waste paper is aggregated by applying a rotational force or vibration. A large number of aggregates thus obtained may be mixed with an adhesive to bond the aggregates together, and after adhesion, put into a container mold device and dried to form a container shape. This manufacturing method has already been disclosed by the present applicant in JP-A-6-247472.

If a substance that generates heat by electromagnetic waves, such as metal powder, is mixed in the material of the container body 2, the material can be easily dried when it is formed into a container shape. Also, when heating the thing stored in the paper water-resistant container 1 by a microwave oven, the heating can be promoted, which is preferable.

Next, the moisture-impermeable plastic film 4 is made of a moisture-impermeable thermoplastic plastic film such as a polyolefin film (for example, a polyethylene film or a polypropylene film) having a thickness of several microns.

The plastic film 4 is formed into a shape that adheres to the inner surface of the container body 2 while heating and softening by using a vacuum forming method such as a skin pack or the like, and follows the inner surface shape without any gap. Here, the container body 2
Since the pulp mold is used as described above, the film can be sucked from the minute gap of the container body 2 by a vacuum suction device so as to be in close contact with the surface of the container body 2.

Therefore, regardless of the shape of the container body 2 or the case where a large number of small projections 6 are formed on the inner surface, the moisture-impermeable plastic film 4 can be made to follow the above-mentioned shape without any change. Will be reproduced.

The plastic film 4 may or may not have an adhesive layer on the back surface. In the present embodiment, an adhesive layer is formed on the back surface of the plastic film 4 and is adhered along the inner surface of the container body 2 without any gap. However, the plastic film 4 is adhered to the inner peripheral surface of the container body 2. Alternatively, the structure may be such that it is simply brought into close contact.

As described above, the container body 2 has the flange 5 extending substantially horizontally in a row along the outer periphery thereof.
Of the plastic film 4 is separated from the container main body 2 without being adhered to the flange 5 or the outer peripheral wall of the container main body 2. are doing.

As a result, the front end of the flange 5 is covered with the plastic film 4 so as to be covered, and the joint 6 between the plastic film 4 and the container body 2 is the back surface of the flange 5.

The paper water-resistant container 1 constructed as described above is
Since the moisture-impermeable plastic film 4 is provided on the inner surface of the container main body 2, it is possible to pack and store a moisture-sensitive material, a water-containing material, or a liquid material. Then, a fluid such as water or water vapor does not enter the gap between the plastic film 4 and the container body 2 from the joint, and the container body is not deteriorated by the water or the fluid. In addition,
This paper water-resistant container 1 may be sealed with an appropriate lid member as needed.

Next, when the paper water-resistant container 1 becomes unnecessary after use, the moisture-impermeable plastic film 4 can be easily removed from the container body 2. That is, since the end of the plastic film 4 is separated from the container body 2, if this portion is pulled and peeled from the container body 2,
The plastic film 4 and the container body 2 can be separated. As described above, since the plastic film 4 can be easily peeled off from the container body 2, only the container body 2 made of pulp mold can be recycled again, or can be incinerated as it is.

In the above embodiment, a plastic film having water impermeability is used as the plastic film. However, a plastic film having a property of transmitting moisture and a plastic film having various functions can be used.

It should be noted that the shape of the container of the present invention is not limited to the container of the above-described embodiment, but can be used for containers of various shapes and uses regardless of the application. The water-resistant paper container 1 shown in FIG. 3 has a tray shape, and the container body 2 has irregularities on its surface. However, the plastic film 4 can be adhered by skin-pack molding.

The plastic film 4 completely covers the flange 5 and is adhered to a part of the outer peripheral wall of the container body 2 beyond the flange 5, and the projecting piece 4 a at the end is separated from the joint 6. ing. Other configurations are the same as those of the above-described embodiment, and the same configurations are denoted by the same reference numerals and description thereof will be omitted.

Further, in the above embodiment, the case where the protruding piece 4a of the plastic film 4 separated from the container main body 2 has the entire periphery of the end is exemplified. However, most of the end of the plastic film 4 is formed by the flange 5 or the flange. It may be adhered to a part of the outer peripheral wall of the container body beyond the back surface, and only a part of the end may be extended to form a projecting piece 4a, which may be used as a peeling piece.

That is, the paper water-resistant container 1 shown in FIG. 4 has a configuration in which the projecting piece 4a is formed only at a part of the end of the plastic film 4 and is separated and protruded from the container main body 2. The end of the plastic film 4 is integrally bonded to the flange 5 or the outer peripheral wall of the container body 2. Other configurations are the same as those in the above embodiment.

In the above embodiment, the plastic film 4
Has shown a configuration in which the plastic film 4 is also bonded to the inner peripheral wall of the container body 2 but not to the inner peripheral wall of the container body 2 in the present invention. . In addition, plastic film 4
May be bonded only to the back surface of the flange 5 and not bonded to the other. Still further, a configuration may be employed in which only the portion of the joint 6 with the plastic film 4 is adhered and the other portions are not adhered. In other words, it goes without saying that various design changes can be made without departing from the scope of the present invention.

[0026]

As described in detail above, in the container structure of the present invention, the flange end of the container main body is covered so as to be rolled up by the plastic film, so that a fluid such as water enters the gap between the container main body and the plastic film. Thus, water resistance and fluid resistance can be improved. Further, since the plastic film is separable from the container body, it is possible to easily peel off only the film at the time of disposal and provide only the container body for recycling or incineration.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a paper water-resistant container according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the paper water-resistant container shown in FIG.

FIG. 3 is a cross-sectional view showing another embodiment of a paper water-resistant container.

FIG. 4 is a perspective view showing another embodiment of the projecting piece.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Container as an example of a water resistant container made of paper 2 ... Container main body 3 ... Product to be stored 4 ... Plastic film 4a ... Projection piece 5 ... Flange 6 ... Joint

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B65D 25/14 BSH B65D 25/14 BSL BSL 1/00 BF Term (Reference) 3E033 AA10 BA10 BA13 BB08 CA09 FA01 FA04 3E062 AA03 AC05 JA03 JA07 JB07 JC02 JD02 4F100 AK01B AK03B AK04 AK07 BA02 DG10A GB16 JD02A JD05

Claims (7)

[Claims] 1. The plastic film, comprising: a container body made of a permeable paper material and provided with a flange on the outer periphery; and a plastic film adhered to the inner surface of the container body by vacuum forming such as a skin pack. Is adhered to the flange back surface beyond the flange tip of the container main body, and at least a part of the end is not adhered and is separated from the container main body and extends as a protruding piece for peeling off. A container structure characterized in that a plastic film can be peeled off from a container body by pulling to separate them. 2. The container structure according to claim 1, wherein the flange extends substantially horizontally in an annular shape along the outer periphery of the container body. 3. The container structure according to claim 1, wherein the projecting piece is formed at a part of an end of the plastic film. 4. The container structure according to claim 1, wherein the air-permeable paper material is made of pulp mold. 5. The container structure according to claim 1, wherein the plastic film is bonded to an intermediate position of the back surface of the flange beyond the front end of the flange of the container body. 6. The container according to claim 1, wherein the plastic film covers the entire back surface of the flange of the container body and is adhered to a part of the outer peripheral wall of the container body. Container structure. 7. The container structure according to claim 1, wherein the plastic film is made of a water-impermeable polyolefin film.