JPS6336946B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for manufacturing products such as cabinets and various boxes by V-cut bending processing of decorative boards laminated with transfer sheets. be.

(Prior art) Conventionally, when assembling products such as cabinets and various boxes using veneer boards, natural wood decorative plywood, etc.,
Even if the surface is coated with flexible resin,
Unlike when using PVC plywood, it was not possible to consistently produce the product on a continuous process line from V-cutting to completion of assembly. In addition, a commercially available pressure-sensitive adhesive film used for purposes such as surface protection of metal plates is used, and after pasting it on the surface of the substrate to be V-cut on the opposite side to the side to be V-cut, There is a so-called taping method in which V-cut processing is performed on the substrate while leaving the attached adhesive film behind. In this way, the V-cut substrates are connected by the adhesive film and do not separate into pieces, but a large amount of pressure-sensitive adhesive film must be used, which is uneconomical.

In addition, laminated sheets of flexible decorative sheets such as vinyl chloride sheets with printed patterns have also been put into practical use, but it is obvious that printed resin sheets are laminated together, which is preferable for the design effect. Nakatsuta.

(Problems to be Solved by the Invention) The present invention aims to eliminate the drawbacks of the conventional methods as described above and to provide a method for inexpensively manufacturing V-cut processed products with good design effects.

(Means for Solving the Problems) As shown in FIG. 2, the transfer sheet 5 used in the present invention consists of a base sheet 4 and a transfer layer 3, and the base sheet is made of paper with a weight of about 23 g/ ^m2. Materials coated with a mold release agent such as urethane, aminoalkyd, silicone, polyamide, etc., or paper with a weight of approximately 50g/ ^m2 laminated with polypropylene resin, polyethylene resin, etc., or paper with a weight of approximately 50g/ ^m2 . It is composed of a paper 1 and a releasable resin layer 2, such as a sheet made of synthetic resin films such as polypropylene resin films and polyethylene resin films bonded together using an adhesive.

Note that an adhesive layer can be provided on the surface of the transfer layer, if necessary. The transfer layer consists of a pattern layer (including single color) formed using ink that adheres to the base sheet with a certain adhesive force, and a surface protection layer formed as necessary. When polypropylene resin is used as the release resin layer, 180 degree peeling strength can be improved by using vinyl chloride resin, nitrocellulose resin, urethane resin, ethylene vinyl acetate resin, vinyl chloride vinyl acetate copolymer resin. 30~500g/
Adhesive strength can be obtained for a width of 25mm.

As shown in FIG. 3, the transfer sheet 5 having the above structure is laminated on the substrate 6 via the adhesive 7 with the transfer layer side facing, and then the V A character-shaped groove 8 is formed.

The material of the board 6 may be V such as plywood or synthetic wood.
Select from those that can be cut, and there is no need to perform surface treatment such as polishing before laminating the transfer sheet. Of course, it is also possible to use a substrate that has been pretreated to have a smooth surface, or a material that is smooth itself. The adhesive 7 is applied to the surface of the transfer layer of the transfer sheet or the surface of the object to be transferred immediately before transfer, and is made of polyester resin, epoxy resin, polyurethane resin, ethylene vinyl acetate resin, vinyl acetate resin, acrylic acetic acid resin, etc. Vinyl resin etc. can be used.

In addition, when using a substrate with a smooth surface, an adhesive layer may be formed in advance on the transfer layer of the transfer sheet.

An adhesive 7 is used to laminate the transfer sheet 5 onto the substrate 6.
It is best to carry out this process while the liquid has fluidity.

The V-shaped groove 8 is formed on the side of the substrate 6 on which the transfer sheet 5 is not laminated, and is deep so that the bottom of the groove does not reach the transfer sheet and is as close as possible to the transfer sheet laminated surface. Form. In any case, since there is no layer that has a buffering effect between the substrate and the pattern layer (transfer layer) compared to the conventional technique in which decorative sheets are laminated, the transfer layer is removed by V-cut processing. Care must be taken to avoid damage.

After forming the V-shaped groove 8, an adhesive is applied inside the groove, the substrate is bent, the adhesive is cured after the bending, various processing is performed as required, and the base sheet 4 is removed. A product as shown in Figure 1 is obtained.

(Function) The reason why the sheet does not break or break even when the elongation rate of the base sheet is 7% or less during the bending work of the V-cut part is because the adhesive force between the transfer layer and the release resin layer is too strong. Because of this, the tensile force exerted during bending causes partial misalignment between the transfer layer and the release resin layer, and that area peels off, so the base sheet is not subjected to tensile force locally, but rather over a certain width. The part receives the tensile force, so even the base sheet with a small elongation rate will not break or crack.

Regarding the adhesion between the transfer layer and the release resin layer, if the tensile strength of the base sheet is stronger than the tensile force that causes misalignment between the layers, that is, the adhesive force between the transfer layer and the release resin layer, the sheet will break. Specifically, it is preferable that the adhesive force between the transfer layer and the releasable resin layer is 180 degree peeling strength and 30 to 500 g/25 mm width.

When laminating the transfer sheet on the substrate, use adhesive 7.
By overlapping and applying pressure while the adhesive has fluidity, even if the surface of the transferred object is not smooth, the adhesive flows and completely connects the transfer layer surface of the transfer sheet and the surface of the transferred object. This ensures close contact and perfect transfer.

(Example) Polypropylene resin was applied to a smooth paper with a basis weight of 60 g/ ^m2 using the extruder lamination method.
A base sheet was prepared by laminating to a thickness of 20 μm, and an acrylic/urethane resin was further applied to a thickness of 10 μm to form a surface protective layer. Next, a pattern layer was printed thereon using an ink containing a copolymer resin of vinyl chloride and vinyl acetate as a binder to obtain a transfer sheet.

Next, apply 100 g/m ² (wet) of ethylene vinyl acetate resin adhesive to the surface of the 9 mm thick plywood, and dry it until it remains somewhat fluid, so that the printed surface of the transfer sheet will adhere. They were stacked on plywood and laminated under pressure.

Next, V-cut processing is applied to the side of the plywood where the transfer sheet is not laminated, adhesive is applied to the V-cut portion, the plywood is bent, and after the adhesive has hardened, the base sheet is removed and V-cut processing is performed. Got the product.

(Effect of the invention) It is possible to create a board that can be temporarily handled in the same way as PVC plywood by simply attaching a transfer sheet to the surface using an adhesive. It is possible to produce a completely continuous product even with

Since there is no decorative sheet layer, there is no peeling of the sheet.

Since there is no decorative sheet layer, when the base material is wood, a member with a woody feel can be obtained.

The transfer sheet serves as a protective sheet.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the V-cut process and removal of the base sheet, Fig. 2 is a sectional view showing the configuration of the transfer sheet, and Fig. 3 is the state with V-shaped grooves formed. FIG. DESCRIPTION OF SYMBOLS 1... Paper, 2... Release resin layer, 3... Transfer layer, 4... Base sheet, 5... Transfer sheet, 6...
...Substrate, 7...Adhesive, 8...V-shaped groove.

Claims (1)

[Claims] 1. Paper with a release resin layer formed on the surface is used as a base sheet, and the adhesive force between the resin layer and the release resin layer is 180 degrees peeling strength.
A transfer sheet is produced by forming a transfer layer with a width of 30 to 500 g/25 mm, and the transfer sheet is laminated with the transfer layer surface facing the substrate via an adhesive, and then the transfer sheet on the substrate is laminated. A V-shaped groove reaching from the substrate surface to the vicinity of the transfer sheet lamination surface is formed on the non-contact surface, an adhesive is applied in the groove, the substrate is bent, and the base sheet is removed after the adhesive has hardened. A method for manufacturing a V-cut processed product characterized by the following.