JP2003236987A - Laminated molded body and method for manufacturing it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated molded body manufactured by press-molding a laminated body manufactured by using a hydrophilic polysaccharide film-like substance such as cellophane into a required shape such as a deep dish-like shape. <P>SOLUTION: The laminated molded body 1 is manufactured by press-molding the laminated body of the hydrophilic polysaccharide film-like substance and a woven fabric or a nonwoven fabric comprising a hydrophilic resin. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminate formed by press-forming a laminate having a hydrophilic polysaccharide film material such as cellophane and a method for producing the same.

[0002]

2. Description of the Related Art A hydrophilic polysaccharide film material such as cellophane has a biodegradability and therefore has an excellent feature that it has little environmental load after use.

However, the hydrophilic polysaccharide film material such as cellophane has a strong self-restoring force and is easily cracked, so that it is difficult to form it in a deep dish shape or the like. Have.

Therefore, an object of the present invention is to provide a laminate formed by pressing a laminate using a hydrophilic polysaccharide film material such as cellophane into a desired shape such as a basin shape.

[0005]

SUMMARY OF THE INVENTION The present invention comprises one or a plurality of hydrophilic polysaccharide film-like materials, and one or a plurality of hydrophilic resin woven or non-woven fabrics containing water.
The above problems were solved by stacking these and press-molding them.

[0006] Since the hydrophilic polysaccharide film and the predetermined woven or non-woven fabric are hydrated and superposed and press-molded, a plurality of hydrophilic polysaccharide film-like products adhere to each other without causing cracks or the like. A molded product having a high strength and a large thickness such as a deep dish can be obtained.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION
A laminate of a hydrophilic polysaccharide film material and a woven or non-woven fabric made of a hydrophilic resin is press-molded.

The above-mentioned hydrophilic polysaccharide film-like material means a film of hydrophilic polysaccharide. Examples of materials for the hydrophilic polysaccharide film include polysaccharides such as mannan, carrageenan, curdlan, alginic acid, chitin, chitosan, and cellulose. Examples of the hydrophilic polysaccharide film include film products of polysaccharides such as mannan, carrageenan, curdlan, alginic acid, chitin and chitosan, cellophane and the like. In addition, the said film-like thing means the concept including a film and a sheet.

The above-mentioned hydrophilic resin means a resin having a water affinity, and examples thereof include cellulose such as pulp and cotton, cross-linked polyvinyl alcohol and the like. Examples of the woven or non-woven fabric made of the hydrophilic resin include woven or non-woven fabric made of rayon, cotton or crosslinked polyvinyl alcohol, paper and the like.

The above-mentioned laminate is, as shown in FIGS. 1 (a) to 1 (i), one or more sheets of the above-mentioned hydrophilic polysaccharide film material (hereinafter abbreviated as "film material"). And a woven or non-woven fabric (hereinafter abbreviated as “woven fabric or the like”) made of one or more hydrophilic resins. Specifically, one or a plurality of film-like substances 11 and one or a plurality of woven fabrics 12 are alternately laminated (FIG. 1A).
(B) (c) (f) (h)), a plurality of film-like objects 1
One or a plurality of woven fabrics 12 or the like are laminated and laminated, and one or a plurality of woven fabrics 12 or a film-like material 11 different from the above is laminated on the upper surface (FIG. 1 (d) (e))
(G)) One film-like material 11 or a laminated body of a plurality of film-like materials 11 and one woven cloth 12 or a laminated body of a plurality of woven cloths 12 are alternately laminated. The ones (FIG. 1 (i)) and the like are included. These layers may be laminated in any order depending on the types and purposes of the film-like material 11 and the woven fabric 12. Also, in FIG.
Although only layers are described, a laminate having 6 or more layers can also be used.

Since the laminate of the film-like material 11 and the woven fabric 12 etc. is used, the strength of the obtained laminated molded article is improved as compared with the case where the film-like material 11 is used alone.

Further, as shown in FIGS. 2 (a) and 2 (b),
You may provide the 3rd layer 13 on the surface of the said laminated body. The third layer 13 can impart other properties to the obtained laminated molded body. Examples of the third layer 13 include polymer layers other than the polymers constituting the film-like material 11 and the woven fabric 12 such as a layer made of polyethylene terephthalate, polyethylene, acrylic resin or the like.
By using the third layer 13 as described above, it is possible to impart waterproof / water repellency, heat sealability and the like to the obtained laminated molded body.

The laminated molded body 1 as shown in FIG.
It is manufactured by hydrating the above-mentioned one or a plurality of film-like materials and one or a plurality of woven fabrics, etc., superposing them and press-molding them, and then drying. In order to make the film-like material and the woven cloth, etc., contain water, the film-like materials, the woven cloth, etc., the film-like material and the woven cloth, etc. are in close contact with each other, and a thick, high-strength laminated molded article is obtained. Easily obtained.

As a method of hydrating the film-like material and the woven cloth, a method of immersing in the aqueous solution, a method of spraying a vapor mist of the aqueous solution onto the film-like material, and a passage of the aqueous solution in a vapor mist atmosphere There are methods. In the case of cellophane, for example, when cellophane is produced from viscose, it may be laminated with a woven fabric or the like as it is in a water-containing state without being dried and press-molded.

When cellophane is used as the film-like material, cellophane having a thickness of 5 to 60 μm is dipped in an aqueous solution and swelled until the thickness becomes 10 to 200 μm to soften the cellophane sufficiently, and thereafter, For example, a swelled cellophane and a woven cloth are laminated and sandwiched between a cup-shaped female mold and a male mold, and a load of 100-
A cup-shaped molded body of a cellophane laminate can be obtained by putting it in a drier at 110 ° C., drying it until the water content disappears, and releasing from the mold after drying.

The water content when the cellophane laminate is put in a mold is 10 to 500 wt%, preferably 20 to 20.
It is about 0 wt%.

As the aqueous solution used for the above-mentioned water-containing operation, water or water obtained by mixing water with an organic solvent having compatibility with water such as methanol, ethanol, isopropyl alcohol, etc. within a range not impairing the purpose. -A hydrophilic polymer-containing aqueous solution obtained by dissolving a hydrophilic polymer such as an organic solvent compatible solution, polyvinyl alcohol, starch, mannan, carrageenan, curdlan, alginic acid, chitin, chitosan, or cellulose in water or the water-organic solvent compatible solution. solution,
Examples thereof include an ethylene vinyl alcohol copolymer-containing aqueous solution obtained by dissolving an ethylene vinyl alcohol copolymer in the water-organic solvent compatible solution.

When the above-mentioned aqueous solution containing a hydrophilic polymer such as polyvinyl alcohol or starch is used, the blocking effect of the hydrophilic polysaccharide film itself as well as the adhesive effect of polyvinyl alcohol, starch or the like can be obtained.
It is possible to obtain a laminated molded body having higher strength. The concentration of polyvinyl alcohol and starch is 0.1-5.
It is preferable to use the one of about wt%.

When an aqueous solution of the ethylene vinyl alcohol copolymer is used, the ethylene vinyl alcohol copolymer imparts a barrier property to the hydrophilic polysaccharide film material after drying.

The film-like material generally swells due to the above-mentioned water-containing operation. Due to this swelling, the affinity of the film-like material with the adjacent film-like material, woven fabric or the like increases. Therefore, even if it is dried after press molding, it is possible to prevent the layered product from separating into layers.

Further, a film-like material such as cellophane is easily cracked in a dry state and cannot be generally press-molded. However, since the film-like material is hydrated as described above and then press-formed, swelling of the film-like material causes The film-like material can be expanded and contracted, and can be press-formed into a desired shape such as a basin shape. Then, when dried after molding, the swollen tissue is tightened, and the film-like materials that are overlapped by press molding or the film-like material and the woven cloth and the like are in close contact with each other and block, so that a film-like material with high resilience such as cellophane. Even though, the molded shape is firmly retained.

[0022]

EXAMPLES Example 1 A deep dish-shaped container made of the laminated compact 1 shown in FIG. 3 was molded as follows. Thickness 20
Cellophane (made by Rengo Co., Ltd.) with a thickness of 50 μm
And Western paper (manufactured by Seiko Paper Co., Ltd.) are soaked in water to swell until the water content of cellophane reaches 100 wt%. Next, these are piled up to form a deep dish female mold (depth 5
cm, opening diameter 8 cm, bottom diameter 5 cm) and male mold, put a load (0.05 kg / cm ² ) on the male mold and put it in a dryer at 105 ° C. for 3 minutes to remove water. Dried. After drying, the mold was released from the mold to obtain a deep dish-shaped container made of the laminated compact 1 shown in FIG.

(Example 2) Polyvinyl alcohol of 0.
A deep dish-shaped container made of the laminated compact 1 shown in FIG. 3 was molded in the same manner as in Example 1 except that a 1% aqueous solution was used. The laminated structure of the container thus formed had a high strength because it had an adhesive layer between cellophane and paper.

(Embodiment 3) A thickness of 2 μm on cellophane
A deep dish-shaped container made of the laminated compact 1 shown in FIG. 3 was molded in the same manner as in Example 1 except that the polyethylene layer was formed. Since the laminated structure of the container thus formed has a polyethylene layer on the surface of cellophane, a container having a high strength and a heat-sealing layer with a waterproof effect was obtained.

[0025]

EFFECTS OF THE INVENTION According to the present invention, a hydrophilic polysaccharide film-like material, a woven fabric, and the like are soaked with water so that they are superposed and press-molded. It is possible to obtain a deep-plate-shaped molded body having a high strength in which objects and the like are in close contact with each other and having high strength.

The laminated molded article produced according to the present invention is composed of a hydrophilic polysaccharide film material, a woven fabric, etc., so that it is biodegradable and has little effect on the environment after use. Play.

[Brief description of drawings]

1A to 1I are sectional views showing an example of a laminated structure of a laminated molded body according to the present invention.

2A and 2B are cross-sectional views showing an example in which a third layer is provided on the surface of the laminated structure of the laminated molded body according to the present invention of FIG.

FIG. 3 is a perspective view showing an example of a laminated molded body according to the present invention.

[Explanation of symbols]

1 Laminated body 11 Film-like material 12 Woven cloth, etc. 13 Third Layer

Continued front page    (72) Inventor Eiji Yamahara             4-1-1, Daikai 4-chome, Fukushima-ku, Osaka             Go Central Research Institute F term (reference) 4F100 AJ03A AJ03C AJ04B AJ04D                       AJ05A AJ05C AK01B AK01D                       AK01E AK04 AK21B AK21D                       AK25 AK42 AT00A AT00C                       BA02 BA03 BA04 BA05 BA10A                       BA10B BA10C BA10D BA10E                       BA13 DG10B DG10D DG12B                       DG12D DG15B DG15D EH012                       EH46 EH76 EJ05B EJ05D                       EJ172 EJ641 JB05A JB05B                       JB05C JB05D JB20 JC00                       JD05 JK01 JK06 JL11

Claims (9)

[Claims] 1. A laminate formed by press-molding a laminate of a woven or non-woven fabric comprising a hydrophilic polysaccharide film material and a hydrophilic resin. 2. The laminated body has a layer in which one or more sheets of the hydrophilic polysaccharide film-like material and one or more sheets of woven or non-woven fabric made of hydrophilic resin are laminated. The laminated molded article according to. 3. The laminated molded article according to claim 1, wherein the material of the hydrophilic polysaccharide film material is a polysaccharide selected from mannan, carrageenan, curdlan, alginic acid, chitin, chitosan and cellulose. 4. The laminated molded article according to claim 1, wherein the hydrophilic polysaccharide film material is cellophane. 5. The laminated molded body according to claim 1, wherein the hydrophilic resin is cellulose or crosslinked polyvinyl alcohol. 6. The laminated molded body according to claim 1, wherein another polymer layer is laminated on the surface of the laminated body. 7. A laminated molded article, which comprises one or a plurality of hydrophilic polysaccharide film-like materials, and one or a plurality of hydrophilic resin woven or non-woven fabrics which are made to contain water, and which are superposed and press-molded. Manufacturing method. 8. At least one selected from polyvinyl alcohol, starch, mannan, carrageenan, curdlan, alginic acid, chitin, chitosan and cellulose.
The method for producing a laminated molded article according to claim 7, wherein one hydrophilic polymer-containing aqueous solution is used to hydrate the hydrophilic polysaccharide film material or a woven or non-woven fabric made of a hydrophilic resin. . 9. The laminate molding according to claim 7, wherein the hydrophilic polysaccharide film material or the woven or non-woven fabric is hydrated by using an aqueous solution containing an ethylene vinyl alcohol copolymer. Body manufacturing method.