JP2002283391A - Method for manufacturing laminated structure and container manufactured by the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated structure suppressed in the penetration of moisture or the absorption of humidity and friendly to the natural environment. SOLUTION: In manufacturing the laminated structure consisting of a base layer and a coating layer laminated to the base layer to surround the entire region thereof, the base layer is constituted of a material prepared by kneading organic matter and a resin and the base layer or the coating layer is set to a base material and the other layer is subjected to insert molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a liquid or powdery substance,
The present invention relates to a method of manufacturing a laminated structure useful for a container or a lid for storing a solid material or the like, and a container manufactured by the method.

2. Description of the Related Art Containers for holding liquids, powders, and solids such as shampoos and detergents are generally made of synthetic resins such as polypropylene. In such containers, as an attempt to reuse resources, the containers are reused as they are,
Only the contents can be refilled, and many products for that purpose are distributed in the market.

[0003] Incidentally, containers made of synthetic resin are not always reused and may be discarded. In such a case, the processing is not easy, and
It is not useful in saving resources.

On the other hand, used papers such as newspapers and corrugated cardboard are relatively easy to process and are inexpensive, so they have been recycled for a long time. Products are being used, and the demand is expected to increase further in the future.

However, paper containers are liable to be deformed or damaged by external forces such as dropping and friction, and are susceptible to moisture and moisture when used in water places such as washrooms and bathrooms (water infiltration). And moisture absorption), discoloration and deterioration due to sweat absorption and sunlight, and discoloration when the contents contain alcohol, solvents, etc., and the odor generated by the paper itself However, it is unavoidable that physical properties change due to usage conditions and environment, such as the fact that paper is easily attached to the contents, and the weakness inherent in paper has not been eliminated.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for producing a novel laminated structure which is mainly composed of organic substances such as paper, pulp and bamboo and which can be applied to bottle-shaped containers and trays or compacts. The container obtained by the method is to be proposed.

[0007]

According to the present invention, in manufacturing a laminated structure comprising a base layer and a coating layer laminated on the base layer and surrounding the entire area, the base layer is kneaded with an organic substance and a resin. A method for producing a laminated structure, comprising a material and insert-molding another layer using the base layer or the coating layer as a base material.

[0008] In the manufacturing method having the above structure, the base layer is made of a material mainly composed of an organic material obtained by kneading at least one kind of paper such as pulverized paper, pulp, bamboo, wood, or rice hull as a raw material of the paper with a resin. Those formed by injection are desirable.

The coating layer is preferably a very thin synthetic resin film.

The covering layer is preferably arranged so as to cover at least one surface of the base layer, and a container formed by sheet molding can be used.

The present invention is also a container for filling the contents, wherein the container is manufactured according to the above-mentioned manufacturing procedure.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described more specifically with reference to the drawings.

FIGS. 1 (a) and 1 (b) show a screw-on cap attached to the mouth of a bottle-type container, in which a coating layer is provided so as to surround the entire area, and a coating layer is provided only on one surface (inner surface). It is a diagram showing a laminated structure according to the present invention, which is shown in an example of the case where a laminated structure is provided.

In FIG. 1, reference numeral 1 denotes a base layer serving as a base material of the screw cap. The base layer 1 is made of a material mainly composed of an organic material obtained by kneading at least one kind of crushed paper, pulp, bamboo, wood, rice hull, or the like, which is a raw material of paper, with a synthetic resin.

Reference numeral 2 denotes a coating layer laminated on the base layer 1. The coating layer 2 is formed of a synthetic resin film having a very small thickness.

The cap shown in FIG. 1 (a) is, for example, as shown in FIGS. 2 (a) to 2 (c), a primary molding for molding the base layer 1 by injection,
The base layer 1 is used as a base material, and the inner layer 2a is insert-molded as a coating layer 2 on the inner side thereof.
b, which can be manufactured through tertiary molding by insert molding, and has a coating layer 2 only on the inner surface, as shown in FIG. be able to.

FIGS. 3 (a) to 3 (c) show a process for producing a cream jar suitable for filling with cosmetics. Although not shown, the cream jar can also be a laminated structure in which the coating layer 2 is provided only on the inner surface, similarly to the above-mentioned cap, and particularly the area from the inner surface to the screw portion for attaching the lid. By providing the coating layer 2 on the base member, even if the content adheres to the screw portion, it can be easily wiped off, and there is an advantage that the content can be prevented from penetrating into the base layer 1.

In FIG. 2, the inner layer 2 is used as the coating layer 2.
After forming the outer layer 2b, the outer layer 2b may be formed after the outer layer 2b is formed as shown in FIG. 3, and the order is not particularly limited in the present invention. Not done. In the present invention, the coating layer 2
Can be formed in advance, and this can be inserted into a mold to perform the injection molding of the base layer 1. When the coating layer 2 is an insert, the coating layer 2 may be formed of a thin container formed by sheet molding.

FIG. 4 shows an example in which the laminated structure according to the present invention is applied to a compact container. FIGS. 5 to 7 show a main body portion and a lid portion constituting the compact container, respectively.
After molding according to the procedure shown in (1), the main body portion and the lid portion may be swingably connected via the pivot pin P.

In the compact container, the main body portion and the lid portion are connected via a pivot pin P, and when the container is stored, the lid portion is engaged with the main body portion to seal the container. The engaging portion is made of the same material as the coating layer, and its thickness is locally increased to secure the strength. Needless to say, the compact container can have a structure in which the coating layer 2 is provided only on the inner surface, similarly to the cap or the cream jar described above.

It is desirable that the laminated structure as a whole, including the coating layer 2, contain pulp, bamboo, wood, rice hulls, etc., which are pulverized paper materials or paper raw materials, in an amount exceeding 50 mass%. More preferably, it is in the range of 50 mass% to 80 mass%.

Resins to be kneaded with paper and the like are polyethylene, polypropylene, polystyrene, polyester (PET,
PBT), nylon, polyacrylonitrile, ethylene vinyl alcohol resin, acid-modified polyethylene, acid-modified polypropylene, elastomer, and the like.

The size of the crushed paper, pulp, bamboo, wood, rice hull, etc. is desirably 3000 μm or less, but is 1500 μm or less, more desirably 500 μm or less for more advantageous molding.

It is particularly desirable that the base layer 1 contains at least one selected from a polyolefin resin using a metallocene catalyst, an acid-modified polyethylene and an acid-modified polypropylene in order to improve the strength against impact. Its content is 5 to 3 with respect to crushed paper and pulp.
It is about 5 mass%.

As the coating layer, polyethylene, polypropylene, polystyrene, polyester (including PET and PBT), nylon, polyacrylonitrile, ethylene vinyl alcohol resin, acid-modified polyethylene, acid-modified polypropylene, estramer and the like can be applied. The thickness is about 0.03 to 2 mm. The coating layer may have a single-layer structure of the above resin, but may have a laminated structure in which EVOH, nylon, or the like serving as a barrier layer is disposed in the middle.

When the resin used for the base layer 1 and the resin used for the coating layer 2 are the same, there is no problem in the adhesiveness between them, but resins having different properties are used. In the case where the same resin is used or when it is necessary to ensure that the resin is closely adhered to each other, an adhesive layer can be provided.

[0027]

According to the present invention, since the main part is made of organic matter such as paper, it is useful for resource saving. Even if it is incinerated at the time of disposal, the amount of calories burned can be kept low, so that it can be used in the natural environment. No adverse effects.

[Brief description of the drawings]

FIG. 1 (a) shows an example of a screw cap having a coating layer on the inner and outer surfaces as a laminated structure according to the present invention, and FIG. 1 (b) shows a screw cap having a coating layer only on the inner surface. FIG. 3 is a diagram showing an example of the above.

FIGS. 2 (a) to 2 (c) are explanatory views of the procedure for manufacturing the screw cap shown in FIG.

FIG. 3 is a view showing a procedure for producing a cream jar.

FIG. 4 shows an example in which a laminated structure according to the present invention is applied to a compact container.

FIG. 5 is an explanatory view of a procedure for producing a compact container.

FIG. 6 is an explanatory view of a procedure for producing a compact container.

FIG. 7 is an explanatory view of a procedure for producing a compact container.

[Description of Signs] 1 base layer 2 coating layer 2a inner layer 2b outer layer P pivot pin

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29L 22:00 B29L 22:00 F term (Reference) 3E061 AA01 AA16 AA24 AB11 AB15 AD03 BB06 DA02 DB11 3E084 AA02 AA12 AA24 AA34 AA35 AA37 AA39 BA01 CA01 CC03 CC07 CC08 DA01 DB12 DB13 DC03 DC07 DC08 FA06 FA09 FB01 GA01 GA06 GB01 GB06 GB12 4F206 AA50 AD06 AD18 AD20 AG03 AH55 AH57 JA07 JB12 JF05 JW41

Claims (6)

[Claims] In producing a laminated structure comprising a base layer and a coating layer laminated on the base layer and surrounding the whole area, the base layer is made of a material obtained by kneading an organic substance and a resin, and A method for producing a laminated structure, wherein another layer is insert-molded using a layer or a coating layer as a base material. 2. The base layer is formed by injection-molding a material mainly composed of an organic substance obtained by kneading at least one kind of crushed paper, pulp, bamboo, wood, rice hull or the like, which is a raw material of paper, with a resin. The method according to claim 1. 3. The method according to claim 1, wherein the coating layer comprises a very thin synthetic resin film. 4. The method according to claim 1, wherein the coating layer is disposed so as to cover at least one surface of the base layer. 5. The production method according to claim 1, wherein the coating layer comprises a container formed by sheet molding. 6. A container for filling the contents, wherein the container is manufactured by the method according to claim 1. Description: