JPH0541760B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to thermally bondable shoji paper. [Conventional technology] Traditionally, shoji paper was attached to wooden frames using glue. On the other hand, in order to save labor in attaching shoji paper, shoji paper has been developed that can be thermally bonded to wooden crosspieces using a household iron.
Conventionally, such heat-bondable shoji paper was
It is known that polyethylene resin with a thickness of 15 to 20 μm is laminated on one side of the shoji paper body by an extrusion lamination method, and then a hot melt agent containing wax or the like is further applied thereon. [Problems to be Solved by the Invention] However, conventional heat-bondable shoji paper does not contain polyethylene resin and hot melt agent in the shoji paper body.
Since the shoji paper is laminated several times, the laminate becomes thick and tends to lose its texture. In addition, with conventional products, the shoji paper sometimes yellowed over time and naturally peeled off from the wooden crosspieces. Furthermore, in conventional products, when the thermally bonded shoji paper was peeled off from the wooden crosspieces, a portion of the hot melt agent sometimes remained and adhered to the wooden crosspieces. The present invention was made to solve these conventional problems, and it can be easily thermally bonded to wooden crosspieces without impairing the texture, and can be easily attached to wooden crosspieces without leaving any residue. An object of the present invention is to provide a heat-adhesive shoji paper that can be peeled off from the shoji paper. [Means and effects for solving the problems] The thermally bondable shoji paper of the present invention contains 90 to 70% by weight of ethylene, vinyl acetate, acrylic acid, acrylic ester, methacrylic acid,
At least one methacrylic acid ester10~
It is characterized by a laminated adhesive layer with a thickness of 7 to 30 μm, which is made of a copolymer with 30% by weight, and the adhesive surface to the shoji paper body and the adhesive surface to the crosspiece have been oxidized. In the present invention, the shoji paper body may be made of paper or nonwoven fabric. In the present invention, the composition of the copolymer constituting the adhesive layer is 10 to 30% by weight of at least one of vinyl acetate, acrylic acid, acrylic ester, methacrylic acid, and methacrylic ester, based on 90 to 70% by weight of ethylene. The reason for using % by weight is as follows. That is, if the content of components other than ethylene is less than 10% by weight, it is necessary to adhere at a temperature of 110° C. or higher during adhesion, making it difficult to adhere with a household iron. On the other hand, components other than ethylene
If it exceeds 30% by weight, there is a risk that the adhesive layer will be thermally degraded during adhesion to the crosspiece. In the present invention, the reason why the adhesive layer has a thickness of 7 to 30 μm is as follows. That is,
If the thickness of the adhesive layer is less than 7 μm, the adhesion to the crosspiece will be unstable, and if it exceeds 30 μm, the texture of the shoji paper will be impaired. The thickness of the adhesive layer is preferably 10 to 20 μm. An extrusion lamination method is used to laminate an adhesive layer on one side of the shoji paper body. At this time, it is desirable to oxidize the adhesive surface of the adhesive layer to the shoji paper in advance by subjecting it to corona discharge or spraying ozone. Further, after lamination, the adhesive surface of the adhesive layer to the crosspiece is oxidized by applying corona discharge or spraying ozone in the same manner as described above. Corona discharge is performed using a known corona discharge treatment device such as a vacuum tube method or a thyristor method.
Processing amount: 5W・min/ ^m2 or more, preferably 10~100W・
Done in min/ ^m2 . For ozone spraying, a gas such as air containing ozone at a rate of 1 g/m ³ or more, preferably 3 g/m ³ or more is sprayed from a nozzle or a slit-shaped outlet at a rate of 0.03/min/cm or more, preferably This is done by spraying at a rate of 0.1/min/cm or more. Then, lamination is performed by thermocompression bonding.
The thermocompression bonding conditions are temperature 200~250℃, linear pressure 10~30Kg/
cm, speed 120-160 m/min. The shoji paper of the present invention has a good texture and can be easily thermally bonded to wooden crosspieces using a household iron. Further, the shoji paper of the present invention can be easily peeled off from the crosspiece without leaving any deposits by heating it in the same way as when adhering it. Conventionally, it has generally been impossible to extrude and laminate a resin film having the composition and thickness as described above onto a shoji paper body. In contrast, in the present invention, the adhesiveness of the adhesive surface is improved by oxidizing the resin film, so a resin film having the composition and thickness described above can be extruded and laminated onto the shoji paper body. , the above-mentioned effects can be obtained. [Examples] Examples of the present invention will be described below. As shown in Examples 1 to 6 in Table 1, ethylene-vinyl acetate copolymer films having different vinyl acetate contents and thicknesses were prepared as adhesive layers.
As shown in Fig. 1, the adhesive layer 2 is laminated as it is or after being oxidized with ozone (on the shoji paper body side) and then laminated on the shoji paper body 1 by an extrusion lamination method. ) 30W on one side
The paper was oxidized by corona discharge (oxidized surface 3) under the conditions of 1 min/m ² to produce thermally bondable shoji paper. Table 1 shows the adhesive strength between the adhesive layer and the shoji paper body.
Although not shown in Table 1, when the film thickness exceeded 30 μm, the original texture of the shoji paper body was impaired. Next, as shown in Fig. 2, the oxidized side 3 side of the obtained thermally bondable shoji paper was thermally bonded to a piece of wood 4 to be used as a crosspiece using a household iron at a bonding temperature of 100°C. . Table 1 shows the adhesive strength between shoji paper and wood. The comparative example (conventional product) in Table 1 is a thermally bondable shoji paper in which a polyethylene resin and a hot melt agent are laminated on the shoji paper body.

【table】

〔Effect of the invention〕

As detailed above, the heat-bondable shoji paper of the present invention has a good texture, can be easily heat-bonded to wooden crosspieces using a household iron, and can be easily bonded to wooden crosspieces without leaving any residue. It can be peeled off from.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a heat-bondable shoji paper according to the present invention, and FIG. 2 is a cross-sectional view showing a state in which the heat-bondable shoji paper according to the present invention is adhered to a wooden crosspiece. 1... Shoji paper body, 2... Adhesive layer, 3... Oxidized surface, 4... Crosspiece.

Claims (1)

[Claims] 1 One side of the shoji paper body contains 90 to 70% ethylene by weight.
and 10 to 30% by weight of at least one of vinyl acetate, acrylic acid, acrylic ester, methacrylic acid, and methacrylic ester, and the adhesive surface to the shoji paper body and the adhesive surface to the crosspiece are oxidized. A thermally bondable shoji paper characterized by laminating a treated adhesive layer with a thickness of 7 to 30 μm.