JPS5828376A - Pasted wood shaving and its manufacture - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pasted sutra used for lunch boxes and the like, and a method for manufacturing the same.

The above-mentioned sutra books are manufactured by bonding thin plates of sliced cedar wood, pine wood, etc. to a base material such as paper or paper-covered aluminum foil.

Generally, this manufacturing process involves applying a water-based or emulsion adhesive such as starch or casein-based adhesive to sliced wood sheets, bonding this to a substrate, and then stacking the laminates and cold pressing them. Temporary adhesion is performed, and in the next step, hot pressing is performed to perform final adhesion, and then the product is dried by passing through a hot air zone.

In order to go through such a large number of processes, equipment is also required, which not only requires investment in equipment but also is uneconomical in terms of the process, making the product cost extremely high.

In addition, since the adhesive is water-based or emulsion type, if insufficient drying occurs, the metal thin film layer of the base material may corrode. There are many disadvantages such as mold and mildew growth.

The object of the present invention is to eliminate the above-mentioned drawbacks and to provide a sutra book that is inexpensive and has excellent moisture resistance, and a method for manufacturing the same.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be explained below based on embodiments shown in the accompanying drawings.

Figures 1 and 2 show the base material of the laminated sutra.

As shown in FIG.
Adhesive, agent layer, or F, VA (ethylene vinyl acetate copolymer, vinyl acetate content 6-90%)
A hot melt type adhesive layer 3 having vinyl acetate as a main component (vinyl acetate content of 6 to 40%) is provided, and a printing layer 4 is provided as required.

It is desirable that the adhesive layer 3 has a thickness of 10 to 30 μm, and when EVA used alone is extrusion coated, the vinyl acetate content is 6 to 40 @M%, the melt index is 1.5 to 400, Specific gravity 0.927-0.953.
When used as an emulsion, vinyl acetate content 50
~90% by weight is desirable.

In the case of a hot-melt type coating mainly composed of EVA, it is desirable to use a coating equivalent to the EVA used for extrusion coating.

The base sheet 2 is made of paper, gold IA such as aluminum, etc.
A. It can be appropriately selected from various films or sheets, such as a bonded product of paper and gold foil, a metallized film, a metallized paper, or a laminate.

Further, as shown in FIG. 2, the sheet 2 and the adhesive layer 3
A layer 5 made of low density polyethylene or a mixed resin of low density polyethylene and EVA may be provided as the intermediate layer 5 between the two. This layer 5 is.

In addition to improving the cushioning properties during bonding, it is also useful for increasing the adhesiveness between the sheet 2 and the adhesive layer 3.

In addition, when the adhesive layer 3 is of the EVA hot melt type, the intermediate layer 5 may include, in addition to the above, EV
A can be used.

It is preferable that the intermediate layer 5 has a thickness of 10 to 20μ, and the low density polyethylene used has a specific gravity of 0.90 to 0.9.
23. Melt index: 3.7 to 12. The EVA is preferably the same as that used in the extrusion coating in the adhesive layer 3.

Next, in order to obtain a sutra using the base material 1 as described above, as shown in FIG.
What is necessary is just to pass between a pair of heat rolls 7.7, and to bond by thermocompression. The temperature at this time is preferably in the range of 130 to 250°C.

Additionally, two or more pairs of rolls may be used as a means to increase the bonding speed.

At this time, if the base material 1 provided with the intermediate layer 5 as described above is used, the unevenness of the thin plate 6 will not affect the adhesive strength, and a stable strength can be obtained.

Note that the vinyl acetate content of the adhesive layer 3 is 6 to 90%.
The range was set as polyethylene for less than 6%, and 90% for polyethylene.
If the adhesive strength is exceeded, the properties become too close to those of vinyl acetate alone, and the desired adhesive strength cannot be achieved.

According to this invention, as described above, since the base material and the thin wood board are bonded together using a thermoplastic adhesive that has good adhesive properties at a relatively low temperature, it is possible to greatly reduce the process. ,
Manufacturing costs can be reduced, and the resulting scriptures are
It has excellent advantages such as no mold growth or corrosion of the metal layer, significantly improved moisture resistance, water resistance, and strength, and the adhesive layer has a hinge-like effect, making it easier to form lunch boxes etc. have

In addition to the above, when bonding the base material and the thin wood board, a slight slip occurs between the roll and the base material, and if paper is used as the base sheet, the paper surface will be rubbed by the roll, causing it to become dull. This also has the advantage of increasing product value.

[Brief explanation of drawings]

1 and 2 are cross-sectional views of the base material used for the sutra production of the present invention, and FIG. 3 is a diagram showing the method of manufacturing the sutra. In the figure, 1 is a base material, 2 is a base sheet, 3 is an adhesive layer, 5 is an intermediate layer, 6 is a thin wood board, and 7 is a hot roll. Patent applicant: Toyo Aluminum Co., Ltd. Agent: Kama 1) Text 2 Figure 3
4. Procedural amendment (vinegar) January 1980 511 Patent Office Commissioner Haruki Ta Haruki Ta's relationship with the case of the person who amends the invention's name pasted sutra and its manufacturing method Patent applicant's address Minamikyuta, Kiku-ku, Osaka 4-25 Bucho 111
814) Toyo Aluminum Co., Ltd. Agent Showa Year Month Day (Delivery date) Number of inventions increased due to amendment Page 3, lines 7-8 of the specification: ``EVA is the main component (vinyl acetate content 6-40%) )" to "The main component is EVA (vinyl acetate content 6-40%)."

Claims (1)

[Claims] 1. A base sheet is bonded to a thin wood board using an adhesive made of ethylene-vinyl acetate copolymer or a hot-melt adhesive whose main component is ethylene-vinyl acetate copolymer. Pasted sutra. 2. An adhesive layer made of ethylene vinyl acetate copolymer or a hot melt type adhesive layer mainly composed of ethylene vinyl acetate copolymer is provided on the base sheet, and this is
A method for producing a laminated script comprising heat-pressing five thin wood plates at a temperature of 30 to 250"C.