JPS6259636B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a decorative board having a spotted or linear raised pattern on its surface, which is used as an interior material such as a ceiling wall material or a furniture lining material.

Conventionally, in order to obtain such a decorative board, a wet mat obtained by a wet paper-forming method is dried and then cut into a certain size, and this is used as a substrate, and a granular or linear coating is applied to the surface. The paint layer is dried.

However, according to such conventional methods,
Two dryers are required to dry the wet mat and the paint layer, which not only complicates the process, but also heat loss occurs in each dryer while the drying process is performed twice, and heat is lost from the dryer. During the transfer to the next dryer, the heat stored in the substrate is released, and a large amount of thermal energy is required again when drying the paint layer, resulting in extremely poor energy efficiency.

Furthermore, if fluff occurs on the surface of the substrate obtained by drying the wet pine, the surface tension of the water in the paint tends to cause polka dots to form on the fluff, reducing the contact surface with the substrate. In addition, it is preferable for the decorative board to have low water absorption due to the purpose of use,
Not only does the contact area of the paint applied on the substrate with the substrate become smaller due to the water repellency of the substrate and the surface tension of water, but also the adhesion strength is insufficient due to the less penetration of the paint into the substrate. There is a drawback that the paint layer does not fit well with the substrate, resulting in peeling of the paint layer during or after the construction of the decorative board.

The present invention was made in view of these drawbacks, and it is possible to reduce the viscosity on paper-formed and dehydrated wet mats.
By using a water-based paint with a high viscosity of 200 cps or more to apply a granular or linear raised coating, and then drying the paint and drying the wet mat at the same time, it not only enables a drying process with high thermal efficiency, but also The present invention provides a method for manufacturing a decorative board in which a paint layer is firmly adhered to the top surface of the board.

To explain the method of the present invention in more detail, when manufacturing fiberboards such as insulation boards, rock wool boards, asbestos boards, pulp cement boards, etc. by a wet papermaking method, a papermaking solution is used to make paper by a wet papermaking machine. Next, dehydration molding is performed to a moisture content of 300% or less using a squeeze roll or wet press to form a wet mat, and then a #4 food cup is placed on the surface (upper surface) of this wet mat.
A raised pattern is formed by applying a water-based paint with a viscosity of 15 seconds (200 cps) or more in spots or lines using a normal painting method such as spray painting or brush painting.

When a water-based paint is applied on a wet mat in this way, when it is applied on a dry fiberboard, a spotted paint layer 11 is formed as shown in FIGS. 1 and 2.
Alternatively, while the linear paint layer 12 maintains its adhered form on the board, as shown in FIGS. 3 and 4, the lower layer of the raised pattern comes into contact with the pine surface due to the moisture in the wet pine. The paint portion spreads in a smearing manner, forming a spotted paint layer 1 or a linear paint layer 2 with a natural shape such as a star shape, tree shape, or sawtooth shape.

Furthermore, if the viscosity of the water-based paint is too low, the infiltration of the paint into the wet mat will be too large, and more fibers on the surface of the wet mat will be exposed on the applied paint layer, which will make the pattern created by the paint layer unclear. This is undesirable because it spoils the appearance.

Also, the color of the water-based paint used is not limited to one color, but two.
Paints with more than one color may be used, and in that case, if they are applied over the wet mat or in a manner that they partially overlap, the colors will subtly mix and a beautiful decorative board with a rich variety can be obtained.

After applying the water-based paint on the wet pine in a granular (spotted) or linear manner, the patterned paint layer and the wet pine are simultaneously dried using an appropriate dryer, and then cut into pieces of a certain size. This is to obtain a decorative board.

Next, examples of the present invention will be shown.

Example 140-200% paper made and dehydrated by wet paper making method
Viscosity on wet mats with moisture content of
A white vinegar emulsion paint of 1000 cps (#4 feed cup 100 sec) was applied in a granular manner using a brush method, dried with a dryer, and then cut into pieces of a certain size.

The obtained decorative board had a three-dimensional raised paint layer with star-shaped spot patterns scattered on its surface, and the paint layer was firmly integrated onto the board surface.

As described above, the present invention provides a method for producing paper with a viscosity of 200 cps on a wet mat that has been made and dehydrated using a wet paper making method.
A granular or linear raised coating is applied using the above-mentioned high viscosity water-based paint, and after the moisture contained in the wet pine is diffused in the areas in contact with the surface of the wet pine in the raised pattern, the paint layer is dried and the wet pine is dried. Since this relates to a method for manufacturing decorative laminates that is characterized by simultaneously carrying out the following steps, water-based paint is applied onto the wet mat in water, so that the paint layer bleeds over the wet mat and spreads in all directions. It is possible to form a coated pattern layer with a rich variety of natural shapes,
Moreover, since both the wet pine and the paint are aqueous media, they are compatible with each other, and even if there is fuzz on the pine surface, the paint does not form into polka dots, making it possible to increase the contact area with the pine and increase the water content. Wet pine with a water absorption rate of 300% or less has a high water absorption rate and a high water absorption rate, so the penetration of the paint into the pine will be large, and the adhesion of the paint layer will increase, making it difficult to absorb water during or after the construction of the decorative board. Also, there is no risk of the paint layer peeling off.

Furthermore, since a water-based paint with a high viscosity of 200 cps or more is used, the linear or granular painted pattern is raised, making it possible to obtain a decorative board with a raised pattern full of three-dimensional effect.

Furthermore, in the method of the present invention, the paint layer applied onto the wet mat is dried at the same time as the drying of the wet mat, which not only simplifies the process, but also enables efficient use of thermal energy and reduces manufacturing costs. In addition, the surface of the fiberboard, which is the base of the decorative board, is partially exposed between the paint layers with spotted or linear patterns provided on the surface of the decorative board, and the unique functions of the fiberboard, such as its breathing effect, are exhibited. It is something that can be effectively demonstrated.

[Brief explanation of the drawing]

1 and 2 are simplified plan views showing the state in which the paint is applied to a dry substrate, and FIGS. 3 and 4 are simplified plan views showing the state in which the paint is applied to the wet mat. 1, 2...patterned paint layer.

Claims (1)

[Claims] 1. A raised pattern is applied by applying a high viscosity water-based paint with a viscosity of 200 cps or more in granules or lines on wet pine paper that has been paper-formed and dehydrated using the wet paper-making method, and the wet pine surface in the granular or linear raised pattern is 1. A method for manufacturing a decorative laminate, which comprises: diffusing the contact area with the moisture contained in the wet pine, and then drying the paint forming the raised pattern and drying the wet pine at the same time.