JPH0536231B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for furniture in which a decorative paper made of thin paper is smoothly adhered to the surface of a substrate having a minutely uneven surface such as a minutely uneven surface due to conduit holes etc. on the surface of lauan plywood. This paper relates to decorative laminates and their manufacturing methods.

Decorative boards in which thin decorative paper is pasted on the surface of lauan plywood have been known for some time.

This type of decorative board has various problems because the decorative paper attached to the surface is made of thin paper.

For example, since a decorative paper made of thin paper is attached to a substrate having a micro-rough surface formed by conduit holes, the decorative paper located in the concave portions of the conduit holes is in a raised state, and the decorative paper is When used on furniture, etc., the floating decorative paper absorbs moisture and dries repeatedly under the influence of the outside air, and the plywood substrate also absorbs moisture and dries under the influence of the outside air. will be repeated. However, because the hygroscopic expansion rate and drying shrinkage rate of the thin decorative paper and the plywood substrate are different, the thin decorative paper floating in the concave portion of the conduit hole may be damaged or damaged over time. It does have the disadvantage of tearing and getting wet.

In addition, methods have been proposed for making decorative boards by utilizing or preventing the moisture absorption expansion of decorative paper made of thin paper.

For example, decorative paper is swollen with a liquid such as water, the swollen decorative paper is supplied onto a substrate coated with adhesive, the paper is heated and adhered with a heating roller, and the decorative paper is dried and shrunk. A method of obtaining a decorative board with a smooth surface is proposed in Japanese Patent Application Laid-Open No. 53-29903. However, the decorative paper, which is made of thin paper that absorbs moisture and swells, is difficult to handle. Not only is it virtually impossible to supply decorative paper using a paper feeding device of a laminator equipped with a laminator, but also the type of adhesive applied to the substrate depends on the type of liquid that swells the decorative paper. In addition, it is necessary to adjust the swelling state of the decorative paper and the drying state of the adhesive applied on the substrate, which has disadvantages that make it impractical.

In addition, in order to adhere smooth decorative paper made of thin paper to the substrate, it is necessary to prevent the decorative paper made of thin paper from swelling due to the influence of moisture in the adhesive used to adhere it to the substrate. Therefore, there is a method of heating and drying most of the water in the adhesive applied to the substrate to scatter it, and then thermo-pressing the decorative paper onto the substrate while the adhesive retains heat. Although proposed in Japanese Patent Publication No. 57-5703, it requires a heating device to scatter the moisture in the adhesive during the manufacturing process of the decorative board, and
It has the disadvantage that skill is required to manage its heating.

Furthermore, in order to prevent moisture in the adhesive from being absorbed into the decorative paper made of thin paper, a water-absorbing sealer such as acrylic resin is applied to the back side of the decorative paper.
JP-A-51-109967 proposes a paper in which an emulsion-type adhesive is then applied and dried, but this decorative paper has a water-absorbing sealer such as acrylic resin applied to the back side. The decorative paper is a type of decorative paper that penetrates into the thin paper that forms the decorative paper to form a substantial resin-impregnated paper, and is coated with adhesive and dried, so it is difficult to create a continuous decorative board using a laminator or the like. It has the disadvantage that it cannot be manufactured.

The present invention solves the above-mentioned drawbacks, and includes:
Conventional equipment can be used, and although the surface of the substrate has minute irregularities, the surface of the decorative board has a smooth decorative surface, and it can withstand moisture absorption, dryness, etc.
To provide a decorative board for furniture that does not deteriorate over time and is not easily scratched, and a method for manufacturing the same.

That is, the physical properties of the present invention as a decorative paper include a hygroscopic expansion rate of 0.1 to 1.0% and a drying shrinkage rate of 0.2 to 1.0%.
1.5% by applying resin paint, etc. to thin paper of about 20 to 40 g/m ² in advance, and then applying a water-soluble adhesive or, if necessary, a water-soluble pigment to which extender pigments are applied to a substrate with a micro-irregular surface. Apply the adhesive so that it is press-fitted into the recesses on the surface of the micro-irregularities, polymerize the decorative paper as it is on the top surface, and stick them together using a pressure heating plate or pressure heating roll, then the adhesive will be applied to the back side of the decorative paper. After penetrating from the adhesive layer on the back side of the decorative paper, it hardens and fixes, and then the adhesive press-fitted into the recesses hardens and dries, so even though the surface of the decorative paper is minutely uneven, the decorative paper are smooth and firmly attached.

The details will be explained below.

First, we use thin paper of approximately 20 to 40 g/ ^m2 as a base, apply sealer treatment, base coat, base printing, pattern printing,
Hygroscopic expansion rate of 0.1-1.0% and drying shrinkage rate of 0.2-1.5% can be achieved by combining top coat etc. as necessary.
Adjust it so that it looks like this and form the decorative paper. Considering the penetration of the adhesive during pasting, etc., it is necessary to perform all of the above-mentioned treatments from one side of the thin paper.

The resin paint, ink, etc. to be used may be those widely used in general, such as aminoalky resin, nitrocellulose resin, acrylic resin, urethane resin, etc.

If the properties of the decorative paper are within the hygroscopic expansion rate range of 0.1% to 1.0%, when the decorative paper is stacked on the substrate surface, the moisture in the adhesive applied to the substrate surface in advance will be absorbed by the decorative paper. absorbs and expands to some extent, especially on the back side of the decorative paper so that it can come into contact with the adhesive inserted into the substrate recess and adhere to each other.

If the hygroscopic expansion rate is 0.1% or less, the contact with the adhesive in the recess will be uneven, resulting in some areas not being bonded. If the hygroscopic expansion rate is 1.0% or more, the pressure heating plate or the Even when heated and dried using a pressure heating roll, expansion remains, making it difficult to make the surface smooth and causing wrinkles, which is not preferable.

If the drying shrinkage rate is 0.2% or less, the expanded decorative paper will not shrink completely even after heat bonding with a pressurized heating plate or pressurized heating roll, and a depression will remain.If the drying shrinkage rate is 1.5% or more, The decorative paper shrinks too much, causing problems such as tearing and destruction of the coating film.

Rather than the elongation of decorative paper caused by moisture absorption and expansion,
It is preferable that the shrinkage caused by shrinkage due to drying is larger.

Substrates with minutely uneven surfaces include lauan plywood,
These include fiberboard, particle board, and inorganic board. These substrates are, for example, lauan plywood, in which small recesses are formed by conduit holes scattered over the entire surface, and the recesses in this case are 1 m/m or less in width, and are usually ~0.3m/m. Alternatively, it may be a rough siding trace used to regulate the thickness of hardboard or particle board.

The adhesive for pasting the decorative paper may be a known adhesive such as urea resin, urea melanin resin, urea vinyl acetate resin, vinyl acetate resin, or ethylene vinyl acetate resin. Adhesives containing extender pigments such as titanium oxide, calcium carbonate, silica, and clay are also used to reduce the volumetric shrinkage of the adhesive when it dries and to make the color of the substrate less susceptible to decorative surfaces. included. The amount of extender pigment to be added to the adhesive is preferably in the range of 3 to 20%; if it is less than 3%, the above objective cannot be achieved, and if it is more than 20%, it is difficult for the adhesive to enter the recesses of the substrate, and the fluidity is reduced. This is not preferable because it prevents uniform application. Generally, the volume shrinkage rate of the adhesive due to drying is 10 to
Since it is approximately 35%, it can be adjusted by changing the amount of extender pigment added to the adhesive or the resin ratio, taking into consideration the size of the irregularities on the substrate surface and the properties of the decorative paper.

As the decorative paper pasting device, a pressure heating plate or a pressure heating roll is used.

First, the adhesive is applied to the surface of the substrate using a roll coater, reverse coating coater, or the like. In the case of spray coating, flow coater, etc., a device for press-fitting into the recesses on the substrate surface is required. After application,
In some cases, air is blown with a flash dryer to adjust the moisture content in the adhesive. A piece of decorative paper is placed on the surface of the substrate coated with this adhesive so that its back side matches the surface coated with the adhesive, and is adhered using a pressure heating plate. In addition, when applying decorative paper continuously, the decorative papers are stacked using a pressure/heat roll so that their back sides match the adhesive-applied surface, and the paper is pasted one after another using a pressure/heat roll. This pressure heating roll is composed of one roll with a large diameter or a set of several rolls with a small diameter, and is pressed one after another.

By pressurizing and heating with a pressure heating plate or a pressure heating roll, a part of the moisture in the adhesive evaporates and permeates from the back side of the decorative paper together with the moisture in the adhesive. In particular, it expands, adheres to and integrates with the adhesive press-fitted into the recess, and is pressed with a pressure heating plate or pressure heating roll, so that the adhesive hardens first on the back side of the decorative paper and then gradually extends into the recess. As it hardens, the decorative paper becomes smooth, and furthermore, the back surface of the portion of the decorative paper located in the substrate recess is strengthened by the adhesive, completing the adhesion.

As described above, according to the present invention, the decorative paper can be adhered smoothly even to a substrate having a surface with minute irregularities, and even if the decorative paper is in a recessed part of the substrate, the decorative paper can be attached with adhesive. Because the substrate and the decorative paper are strengthened by the conventional equipment, the substrate and the decorative paper are integrated, improving durability against drying, shrinkage and expansion due to moisture absorption, and exhibits very little change over time. It can be obtained through a simple process using .

Claims (1)

[Claims] 1. Made of thin paper with a weight of about 20 to 40 g/m ² and a hygroscopic expansion rate of
Decorative paper with a drying shrinkage rate of 0.1 to 1.0% and a drying shrinkage rate of 0.2 to 1.5% is smoothly adhered to the surface of a substrate with a micro-uneven surface using a water-soluble adhesive, and the paper is placed in the depressions of the substrate. A decorative board for furniture, characterized in that the back surface of the decorative paper, which is smooth, is impregnated with the adhesive to strengthen the portions located in the recesses. 2 Apply resin paint, etc. to thin paper of approximately 20 to 40 g/ ^m2 , and set the moisture absorption expansion rate to 0.1 to 1.0% and the drying shrinkage rate to 0.2 to 1.5.
%, a water-soluble adhesive is applied to the surface of a substrate having a finely uneven surface so as to be press-fitted into the recesses in the finely uneven surface, and the decorative paper is directly stacked on the surface of the substrate. Furniture characterized in that the decorative paper is adhered smoothly to the surface of the substrate by heating and pressing with a pressurized heating plate or a pressurized heating roll to harden the adhesive layer on the back side of the decorative paper. Method of manufacturing decorative board for use.