JP2002096813A - Pulp container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pulp container including a plastic film laminated on a pulp layer which is easy to separate the plastic film from the pulp layer for collection and to reuse them as materials. SOLUTION: The pulp container comprises a pulp layer and a plastic film layer laminated with each other, wherein a cut line as a start point to peel the pulp layer from the plastic film is provided on the pulp layer on a periphery of an opening of the container.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a pulp container having a plastic film layer laminated thereon.

[0002]

2. Description of the Related Art Conventionally, containers manufactured by a pulp molding method using natural pulp as a raw material have been known. Such containers do not pollute the environment and can be reused by recycling. In addition, it does not generate harmful substances even when incinerated, and has high heat resistance,
Since it does not deform due to heat, it is extremely safe.

[0003] However, since pulp is a fibrous material, for example, when a container made of pulp is used as a food container, moisture or oil in food permeates the container or leaks to the outside through the container. There is a risk of getting out. Such a disadvantage can be easily solved by laminating a plastic film on the container. However, if the pulp layer and the plastic film remain integrated, the pulp layer cannot be recovered and used again as a raw material.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to separate and recover a plastic film and a pulp layer even in a container in which a plastic film is laminated on a pulp layer. It is another object of the present invention to provide a pulp container that can be easily converted into a raw material.

[0005]

DISCLOSURE OF THE INVENTION The pulp container of the present invention comprises:
A container in which a pulp layer and a plastic film layer are laminated, wherein a cut line as a starting point for separating the pulp layer and the plastic film layer is provided in the pulp layer around the container opening. Features.

The pulp container of the present invention preferably has a flange at the periphery of the opening, and the cut line is preferably provided at a corner of the flange so as to form a photographic piece.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments. FIG. 1 is a perspective view showing an example of the pulp container of the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG. 1 and 2, 1 denotes a pulp container of the present invention, 2 denotes a pulp layer, 3 denotes a plastic film layer, 4 denotes a flange portion, 5 denotes a cut line, and 6 denotes a photographed piece. .

[0008] The pulp container of the present invention comprises a pulp layer 2 and a plastic film layer 3. Examples of the pulp constituting the pulp layer 2 include pulp obtained from natural or highly fibrous plants as raw materials and recycled pulp obtained by recycling used paper such as newsprint produced from the pulp. Natural pulp is produced using natural wood used for conventional pulp as a raw material. Examples of the natural wood include conifers such as Ezomatsu, Todomatsu and Akamatsu, broadleaf trees such as oak and oak, and grasses. Imported logs such as fir, mangrove, and eucalyptus are included. In addition, straws, reeds, bagasse, linters, and the like can be given as examples of pulp obtained from plants having a high fiber content.

As the waste paper used as a raw material of recycled pulp, newspaper, magazines, paperboard, packaging boxes, and other printed materials can be mentioned.
These are collected and subjected to treatments such as deinking and resin removal to produce recycled pulp. The recycled pulp can be used alone, or can be used as a mixture with fresh pulp.

In the present invention, at least one selected from phenol resin, melamine resin, urea resin and the like can be added to the pulp layer 2 in order to improve the strength and waterproofness of the pulp layer 2. Examples of the phenol resin include a phenol-formalin resin, a cresol-formalin resin, and an alkylphenol-formalin resin. The melamine resin includes a melamine-formalin resin, and the urea resin includes a urea-formalin resin.

Further, in order to improve the strength, natural pastes such as starch, processed starch, CMC, poval, etc., synthetic pastes and water-soluble polymer compounds (hereinafter referred to as "paste").
Can also be used. The sizing agent can be used alone, but is used in combination with the phenolic resin and the like,
If the strength is further improved, it is possible to prevent wear due to friction or the like and breakage due to impact.

As described above, a pulp container obtained by adding a synthetic resin and a sizing agent to the pulp layer 2 and heat-molding the pulp layer 2 has improved hardness and strength, so that a large number of containers can be stacked. It is high in strength that does not cause breakage or dents even by contact or impact.

The thickness of the pulp layer 2 is not particularly limited,
It is preferably from 2.5 to 0.3 mm, more preferably from 2 to 0.4 mm, and particularly preferably from 1.5 to 0.5 mm. When the thickness of the pulp layer 2 exceeds 2.5 mm, the pulp container 1
When the thickness is less than 0.3, the strength of the pulp container 1 may be weakened and the pulp container 1 may not function as a container.

The plastic film layer 3 constituting the pulp container 1 of the present invention is not particularly limited, and polypropylene resins such as propylene homopolymer, propylene block polymer and propylene random polymer, low density polyethylene, high density polyethylene, A polyethylene resin such as a chain low-density polyethylene, a polyester resin, a nylon resin, a polyacrylic resin, a polystyrene resin, and the like can be appropriately selected and used to improve heat resistance, oil resistance, and the like.

The thickness of the plastic film layer 3 is not particularly limited, but is preferably 200 to 15 μm,
20 μm is more preferred, and 120 to 40 mm is even more preferred. If the thickness of the plastic film layer 3 exceeds 200 μm, the pulp container 1 may have an excessive quality. If the thickness is less than 15 μm, the plastic film layer 3 is too thin, the strength is weakened, and the plastic film layer 3 is easily broken. May not be easily separated from the pulp layer 2.

In the pulp container 1 of the present invention, a score line 5 is provided in the pulp layer 2 around the opening of the container. Score line 5
Is provided in this manner, the pulp layer 2 and the plastic film layer 3 can be easily separated from the score line 5, so that the pulp layer and the plastic film layer 3 are separated and collected, Each can be easily recycled. It is preferable that the score line 5 penetrates through the pulp layer 2 because the plastic film layer 3 can be easily peeled off. However, as long as the pulp layer 2 and the plastic film layer 3 can be peeled off, the pulp layer is preferably formed. 2 does not have to penetrate.

In the present invention, as shown in FIG. 1, the pulp container 1 preferably has a flange portion 4, and the cut line 5 is formed at a corner of the flange portion 4 by a photographing piece 6.
Is preferably provided so as to form When the cut line 5 is provided in this manner, the photographing piece 6 is bent along the cut line 5 from the pulp layer 2 side to the plastic film layer 3 side, and then as shown in FIG. By pulling the photographic piece 6 toward the inside of the pulp container 1, the pulp layer 2 and the plastic film layer 3 can be easily separated.

In the pulp container 1 of the present invention, the pulp layer 2 in the width direction portion of the flange portion 4 and the pulp layer 2 in the longitudinal direction portion are provided.
The cutting line 5 can be provided in the pulp layer around the opening of the container even if the container does not have a flange portion. Further, in the present invention, a plurality of cut lines can be provided for one pulp container.

In order to obtain the pulp container 1 of the present invention, first, a pulp layer 2 having a desired shape is formed, and then a plastic film layer 3 is laminated. For the formation of the pulp layer 2, an apparatus used in a conventional pulp molding method can be used as it is. In such a method, first, a pulp liquid is poured onto a wire mesh or the like, dewatered by pressing or suction to extract a pulp component, and then subjected to heat molding to form a pulp layer 2. However, in the present invention, any method can be used. For example, a manufacturing method according to the application of the present applicant (Japanese Patent Application Nos.
No. 4251) can also be used to form the pulp layer 2.

The plastic film layer 3 is preferable because it is possible to efficiently laminate the plastic film on the pulp layer 2 having the above-mentioned shape by heat fusion. However, the present invention is not limited to lamination by heat fusion, and plastic films can be laminated using an adhesive or can be laminated by pressing.

The score line 5 is formed in the pulp layer 2 by, for example, attaching a flat blade or a saw-shaped knives blade to an air cylinder or a press machine and appropriately adjusting the depth of the score line.

The plastic film layer 3 is preferably provided inside the pulp container 1, but in the present invention, it can also be provided outside the pulp container 1;
It can also be provided both inside and outside. When plastic film layers 3 are provided on both sides of the pulp container 1,
A cutting line 5 serving as a starting point for separating the inner plastic film 3 and the pulp layer 2 and a cutting line 5 serving as a starting point for separating the outer plastic film 3 and the pulp layer 2 are separately provided. Can be plastic film 3
Is preferable because it can be easily peeled off.

[0023]

The pulp container of the present invention is a container in which a pulp layer and a plastic film layer are laminated. Therefore, even if the container is made of pulp, for example, when packaging food, moisture or oil in the food does not permeate the container or penetrate the container and leak to the outside. .

Further, in the pulp container of the present invention, a cut line as a starting point for separating the pulp layer and the plastic film layer is provided in the pulp layer around the opening of the container. Therefore, since the pulp layer and the plastic film layer can be easily separated, both can be separately recovered and used again as a raw material. That is, recycling is easy.

In the present invention, if the container is provided with a flange at the periphery of the opening and the cut line is provided at the corner of the flange so as to form a photographing piece, The pulp layer and the plastic film layer are very easily peeled off by bending the piece along the cut line, bending the pulp layer side toward the plastic film layer side, and pulling the photographic piece toward the inside of the pulp container. be able to.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a pulp container of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is an explanatory view of a method of peeling a pulp layer and a plastic film layer.

[Description of Signs] 1 Pulp container 2 Pulp layer 3 Plastic film layer 4 Flange part 5 Cut line 6 Shooting piece

Continued on the front page F term (reference) 3E033 AA10 BA10 BA13 BB08 CA07 DA08 DD01 DE20 4F100 AK01B AK05 AK06 AK07 AK12 AK25 AK41 AK46 AK63 AL02 AL03 BA02 BA07 DA04A DB01A DG02A GB16 JL14 JL16 4F301 AAAB AB AB AA BG

Claims (2)

[Claims] 1. A container in which a pulp layer and a plastic film layer are laminated, wherein a cut line as a starting point for separating the pulp layer and the plastic film layer is provided in the pulp layer around the opening of the container. A pulp container characterized by being made. 2. The container has a flange on the periphery of the opening,
2. A cut line is provided at a corner portion of the flange portion so as to form a photographing piece.
A pulp container as described.