JPH06158830A - Floor material - Google Patents

Abstract

PURPOSE:To enhance the cracking resistance and water resistance of floor material by subjecting a medium-density fiber board to high-temperature treatments in an inert gas atmosphere to provide a surface bed material, bonding a decorative projecting panel to the surface of the material, and laminating a base on the back of the material. CONSTITUTION:A medium-density fiber board such as starwood is subjected to high temperature treatments in an inert gas atmosphere of nitrogen gas or the like to form a surface bed material. Next, an adhesive is applied to the surface of the surface bed material, and the surface bed material is hot pressed and bonded to a decorative panel such as an oak projecting panel. Then a base made of plywood is laminated on the back of the surface bed material using a modified melamine resin adhesive. The medium-density fiber board is thereby restrained from absorbing water and swelling and the surface of floor material is prevented from swelling even when absorbing moisture and water.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a medium density fiberboard (MD
F) relating to floor materials.

[0002]

2. Description of the Related Art Conventionally, there has been provided a flooring material having a medium-density fiberboard (MDF) as a surface base material, a decorative veneer attached to the surface thereof, and a base material laminated on the back surface thereof to improve crack resistance. Has been done. This is because the medium density fiberboard is thermo-compressed with wood fiber as a constituent element, so unlike the lumbered board, there is almost no directionality in the fiber, so the vertical and horizontal strength and expansion and contraction are not affected, and the water content is This is because cracks and tears due to changes and deviations due to dimensional changes are less likely to occur.

[0003]

However, since the medium density fiberboard is manufactured by being hot pressed at a high temperature, it has a contracting stress inside, and therefore, the thickness of the medium density fiberboard returns due to relaxation during moisture absorption or water absorption. When used as a material, there was a risk that the surface would swell. The present invention has been made in view of the above problems, and its object is to:
It is an object of the present invention to provide a flooring material having good water resistance, in which crack resistance is improved by using a medium density fiberboard as a surface base material, and the surface does not swell even when moisture or water is absorbed.

[0004]

The flooring material of the present invention comprises a medium density fiberboard which has been subjected to a high temperature treatment in an inert gas atmosphere as a surface base material and has a decorative veneer attached to the surface thereof and a base material on the back surface thereof. The above problem is solved by this structure.

[0005]

[Function] By subjecting the medium-density fiberboard to high-temperature treatment, it is possible to remove hydroxyl groups in the wood and suppress swelling of the medium-density fiberboard due to water absorption. It does not swell and has good water resistance. The present invention will be described in detail below.

[0006] The medium density fiberboard is a pulp fiber made from plant fibers, and is made into a plate by adding an auxiliary material to the pulp fiber, and is produced by heating and pressing. This medium density fiberboard has been subjected to high temperature treatment in an inert gas atmosphere. For example, the treatment is performed in a nitrogen gas atmosphere at a temperature of 165 to 175 ° C. for about 2 hours. When the treatment temperature is lower than 165 ° C, the water resistance is not significantly improved, and when the treatment temperature exceeds 175 ° C, the material tends to be significantly deteriorated. By this high temperature treatment, the hydroxyl groups in the wood are removed, the water absorption of the medium density fiberboard is reduced, and swelling due to water absorption can be suppressed.

A floorboard is manufactured by using a medium-density fiberboard which has been subjected to a high temperature treatment under this inert gas atmosphere as a surface base material, and adhering a decorative veneer to the surface thereof and laminating a base material on the back surface. By using a medium-density fiberboard as the surface base material, the flooring material has improved crack resistance, and the surface does not swell even when moisture or water is absorbed, and the water resistance is good.

Next, the present invention will be specifically described based on examples. (Example) A commercially available medium-density fiberboard "Starwood" (trade name, manufactured by Hokushin Co., Ltd.) having a thickness of 2.7 mm was heat-treated for 2 hours at 170 ° C under a nitrogen gas atmosphere. Then
An adhesive was applied to the surface of this medium-density fiberboard at a rate of 130 g / m ² , and a 0.3 mm oak veneer was hot-pressed and stuck.

Then, a floor material was manufactured by laminating a 9 mm plywood with a modified melamine resin adhesive on the back surface of the medium density fiberboard. A V groove was processed on this floor material, and after urethane coating was applied, a cold heat repeated test (80 ° C., 2 Hr⇔−20 ° C., 2
After 10 cycles of Hr), a wet heat test was performed based on JIS. The results are shown in Table 1. (Comparative Example) A flooring material was manufactured in the same manner as in Example except that the medium-density fiberboard was not heat-treated, the V groove was processed, and urethane coating was applied.

The same test as the example was conducted. First result
Shown in the table. Table 1 After coating After accelerated deterioration Example Case Case Comparison Case Case Swelling occurred in groove

[0011]

According to the present invention, a medium-density fiberboard treated at a high temperature in an inert gas atmosphere is used as a surface base material and a decorative veneer is attached to the surface and a base material is laminated on the back surface. Therefore, the crack resistance is improved by using the medium density fiberboard as the surface base material, and further, by subjecting the medium density fiberboard to high temperature treatment, the hydroxyl groups in the wood are removed and water absorption of the medium density fiberboard is caused. The swelling can be suppressed, the surface of the floor material does not swell even when it absorbs moisture or water, and the water resistance becomes good.

Claims (1)

[Claims] 1. A floor comprising a medium-density fiberboard that has been subjected to a high temperature treatment in an inert gas atmosphere as a surface base material, and a decorative veneer is attached to the surface thereof and a base material is laminated on the back surface thereof. Material.