JPH0798330B2 - Method for manufacturing heat resistant flooring - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing a heat-resistant flooring material used for a wood-based floor heating panel or the like.

[Background technology]

Recently, a heating element such as a hot water pipe or an electric heater is placed on the floor surface, and a wood-based floor panel is installed on the upper surface of this heating element, or the heating element is installed in the floor panel, A floor heating system has been proposed which can perform heating from the floor. Since such floor heating uses a wooden floor panel, it has an advantage that it is excellent in appearance and walking feeling.

However, when a wooden floor panel is used for floor heating, there is a drawback in that, due to repeated cold heat, repeated moisture absorption / drying, and the like, graining, warping, cracks and the like are likely to occur. In order to eliminate these drawbacks, it has been studied to impregnate the surface wood veneer with a synthetic resin, but it was not effective in eliminating cracks and warpage.

In addition, there are restrictions on equipment for coloring the wood veneer used for the surface of the floor panel. In other words, the type that can be colored is determined by the number of synthetic resin storage tanks for storing individual colored resins, and when changing to another color, the color inside the tank, the vacuum pressurizer, and the piping If the synthetic resin is not sufficiently removed, there is a possibility that colors may be mixed.

[Object of the Invention]

An object of the present invention is to provide a method for producing a heat resistant flooring material which has improved crack resistance, is free from warpage, and can be easily colored in any desired color.

[Disclosure of Invention]

The method for producing a heat-resistant flooring material of the present invention, a wood veneer is laminated on a base plywood so that the fiber direction of the surface of the base material composite and the fiber direction of the wood veneer are orthogonal to each other, and the wood material is A step of obtaining, a step of impregnating the wood material with a resin, a step of washing the resin-impregnated wood material with a solvent to remove the resin in the conduit of the wood veneer, and a color inside the conduit from which the resin has been removed A step of filling the resin and curing the resin, a step of removing the colored resin on the surface of the wood material after the resin has been cured, and a step of successively applying a base coat and a top coat to the surface of the wood material from which the color resin has been removed. Is included.

Thus, according to the present invention, since the wood veneer is attached to the surface of the base plywood so that the fiber directions thereof are orthogonal to each other, warpage due to repeated cold heat, repeated absorption of moisture and dryness, and generation of cracks. In addition, since the resin is impregnated into the wood material in which the wood veneer is pasted on the surface of the base plywood, it is possible to improve dimensional stability, water resistance, heat resistance, strength, etc. Moreover, since the resin in the conduit of the wood veneer is removed by the solvent and the colored resin is filled in the conduit, it is possible to easily obtain a variety of colored floor materials.

The method of the present invention will be described in detail with reference to FIGS. FIG. 1 shows the step of attaching the wood veneer 1 and the base material composite 2 in the present invention.
The wood material 3 is obtained by adhering the fibers so that their fiber directions are orthogonal to each other (the fiber directions are indicated by arrows).

The wood veneer 1 may be a natural veneer or a decorative veneer with artificially patterned wood grain pattern. The wood veneer 1 having a thickness of 1 mm or less is used. The base plywood 2 is a cross plywood having a thickness of about 2 to 3 mm.

As the adhesive for adhering the wood veneer 1 and the base plywood 2, for example, an aqueous vinyl urethane adhesive, a polyvinyl acetate adhesive, a rubber latex adhesive, or the like can be used. In addition, it is preferable that the wood veneer 1 and the base plywood 2 have a water content of 10% or less in advance before they are attached.

As shown in FIG. 2, each of the obtained wood materials 3 is housed side by side in a cage 4 via a spacer (not shown), placed in a decompression / pressurizing pot, decompressed, and then pressurized to obtain a resin. The resin is impregnated by a pressure reduction and pressure method of impregnating with. Examples of the resin include polymerizable monomers and prepolymers such as styrene and unsaturated polyester, and it is preferable to use a clear resin. In addition to the above-described reduced pressure and pressure method, the resin may be impregnated by a normal pressure dipping method or a normal pressure method in which the resin is impregnated under normal pressure.

FIG. 3 (A) shows the wood material 3 thus impregnated with the resin, and the resin penetrates into the wood material 3 as well as the wood veneer 1 forming the surface layer of the wood material 3. The surface of the wood veneer 1 is covered with the resin 5, and the resin 5 is filled in the conduit 6 of the wood veneer 1. In this state, the wood material 3 is washed with a solvent to remove the surface of the wood veneer 1 and the resin 5 in the conduit 6 as shown in FIG. 3 (B). As the solvent, for example, styrene, acetone, methyl ethyl ketone, etc. can be used.

After washing with the solvent, the wood material 3 is heated in a dryer to be cured, preferably semi-cured. After cooling to room temperature, the third
As shown in FIG. 2C, the colored resin 7 is applied to the surface of the wood veneer 1.
Is applied (overcoat) to fill the inside of the conduit 6 with the colored resin 7, and then heated and, if necessary, pressurized to completely cure the resin. After curing, the temperature is allowed to cool to room temperature, and the colored resin 7 attached to the surface of the wood veneer 1 is removed by sander or the like.

Therefore, even if the impregnated resin is a clear resin that is not colored, by filling the conduit 6 of the wood veneer 1 with the colored resin 7 that is colored in various colors, It can be colored in various colors.

The wood material 3 colored in this way is then painted on its surface. Painting is divided into undercoating and topcoating. Groove processing is performed on the surface of the wood material 3 between the undercoating and the topcoating. That is, as shown in FIG. 4, a vertical groove 8 and a horizontal groove 9 are provided on the surface of the wood material 3,
A form as a wooden floor material is given. 5 (A) and 5 (B) show the sectional shapes of the vertical groove 8 and the horizontal groove 9, respectively. After grooving, finish sanding, then topcoat painting.

Next, the method for producing the heat resistant flooring material of the present invention will be described with reference to examples.

Example: For a hardwood having a thickness of 0.6 mm, a veneer (wood veneer) and a substrate plywood having a thickness of 2.5 mm were cut into a predetermined area, and the water content was adjusted to 6% or less. The pieces were superposed on each other with the fibers interposed therebetween and were orthogonal to each other, and were heated and pressed to be integrally attached. At this time, the amount of adhesive applied is 108.7 to 2
17.4g / m ² (10-20g / scale ² ), press temperature 100-150 ℃,
The pressing pressure was 5 to 10 kg / cm ² , and the pressing time was 60 to 180 seconds.

After sticking, each of the obtained wood materials was put into a cage through a spacer, housed in a depressurization pressure pot, and after depressurizing the pot, a polymerizable resin (unsaturated polyester, styrene and BPO was added). Was added, and the depressurized state was maintained for a certain period of time, and then pressure was applied to impregnate the wood material with the resin.

After impregnating the resin, wash the wood material with acetone for 3 to 30 seconds, then remove the resin on the surface of the veneer and the conduit, then 40 to
The resin was semi-cured by heating at 100 ° C and allowed to cool to room temperature. Next, the colored resin is applied on the single plate at 32.6 to 108.7 g / m ² (3
The resin was completely cured by overcoating with -10 g / scale ² ) and heating and pressing at a temperature of 110-180 ° C and a pressure of 5-15 seconds for 3-20 minutes. After cooling to room temperature, wide belt sander (# 100-20
Then, the colored resin on the surface of the single plate was removed. The obtained wood material had the surface conduit beautifully colored.

The surface of the obtained wood material was undercoated. That is, about 33-87 g / g of acrylic resin-based UV curable resin paint
It was coated with m ² (3 to 8 g / scale ² ) and irradiated with ultraviolet rays to be cured. Then, cut vertical and horizontal grooves on the surface of the wood material with a router machine and finish sanding (# 200-40
After performing 0), a top coat was applied.

The obtained flooring material did not show any eyes, warpage, cracks or the like in the cold heat repeated test and the moisture absorption / dry repeated test.

〔The invention's effect〕

According to this invention, since the wood veneer is attached to the surface of the base plywood so that the fiber directions thereof are orthogonal to each other, it is possible to prevent warpage due to repeated cold heat, repeated absorption of moisture and dryness, and the occurrence of cracks. Moreover, since the wood material in which the wood veneer is attached to the surface of the base plywood is impregnated with resin, it is possible to improve dimensional stability, water resistance, heat resistance, strength, etc.
Moreover, since the resin in the conduit of the wood veneer is removed by the solvent and the colored resin is filled in the conduit, there is an effect that a variety of colored floor materials can be easily obtained.

Next, a method for manufacturing a resin-impregnated wood-based decorative veneer will be described with reference to FIGS. 6 to 9.

Conventionally, there has been a fatal defect in a wood veneer (thickness: 0.2 to 1 mm) impregnated with a synthetic resin (unsaturated polyester, styrene, etc.), particularly in a coniferous wood veneer. That is, when a wood veneer 12 as shown in FIG. 6 is impregnated with a synthetic resin, a difference in resin impregnation rate occurs between the low-density spring material part 13 and the high-density summer material part 13, resulting in a low-density spring material. The wood part 13 has a higher resin impregnation rate than the high-density summer wood part 14, and the spring wood part 13
Since it becomes transparent as it becomes clearer, as shown in FIG. 7, when the wood veneer 12 is pasted on the base plate plywood 16 coated with the adhesive 15 colored in reddish brown which is the color of the summer wood, As shown in FIG. 8, since the color of the adhesive 15 is reflected on the spring material portion 13 and becomes darker than the summer material portion 14, the result is that the spring material portion 13 and the summer material portion 14 are reversed in appearance. The grain pattern was good, but the grain pattern had an unnatural expression.

Therefore, the wood veneer impregnated with the synthetic resin is dipped in a solvent bath (styrene, acetone, methyl ethyl ketone, etc.) to elute and remove a part of the synthetic resin impregnated in the spring material to improve the impregnation rate of the spring material. Make sure that it is lowered before adhering to the base plywood.

As described above, since a part of the resin impregnated in the spring material part is removed, the transparency of the spring material part is lowered, and a decorative veneer having a natural pattern in which the spring material part and the summer material part are not reversed can be obtained.

It is suitable that the wood veneer is immersed in the solvent bath for about 10 to 120 minutes. After the immersion in the solvent bath, the wood veneer is dried with hot air at 120 ± 10 ° C for about 10 to 12 minutes to semi-cure it. Next, an adhesive is applied on the base plate plywood, and the pasting process and the impregnated synthetic resin are completely cured, and then actual processing and surface coating are performed.

Further, it is preferable to use, as the colored adhesive agent applied to the base plate plywood, a coloring agent in which the coloring agent is reduced to about 1/10 or less as compared with the conventional colored adhesive agent.

Next, a reference example will be described in detail.

Reference Example 1: A 0.25 mm thick grain veneer of rice hemlock was impregnated with unsaturated polyester by a reduced pressure method. Then, the resin-impregnated veneer was dipped in an acetone bath for 30 minutes, taken out, semi-cured, and laminated on a base plate plywood coated with a colored adhesive. Then, actual processing and coating finish were performed according to a conventional method to obtain a decorative veneer.

The colored adhesive used was one in which the colorant was added at a ratio of 0.5 part with respect to 100 parts of the main component of the adhesive.

Reference Example 2: A decorative veneer was obtained in the same manner as in Reference Example 1 except that a grain veneer having a thickness of 0.3 mm of Yonematsu was used.

Reference Example 3: Using a straight grain veneer having a thickness of 0.3 mm of rice hemlock, impregnated with a synthetic resin in the same manner as in Reference Example 1, immersed in a styrene bath for 1.5 hours, then taken out and semi-cured. A decorative veneer was obtained in the same manner as in Reference Example 1 except for the above.

Comparative reference example: Without immersing the synthetic resin-impregnated single plate in a solvent bath,
The main component of the adhesive as a colored adhesive that is semi-cured as it is, pasted on the base plate plywood, and applied on the base plate plywood.
A decorative veneer was obtained in the same manner as in Reference Example 1 except that a coloring agent was added at a ratio of 5.5 parts per 100 parts.

FIG. 9 shows the decorative veneers obtained in these reference examples and comparative reference examples. The decorative veneer 19 obtained in the comparative reference example was compared with the original veneer 18 not impregnated with synthetic resin. However, the spring wood part and the summer material were completely reversed, but the decorative veneer 20 obtained in each reference example did not show such a pattern reversal. By the way, the impregnation rate of the decorative veneer 19 obtained in Comparative Reference Example was 250 to 300% in the spring wood part and 50 to 100% in the summer wood part. On the other hand, the decorative veneer 20 obtained in the reference example had 100 to 150% in the spring wood part and 40 to 80% in the summer wood part.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a step of laminating a wood veneer and a base plywood according to the present invention, and FIG. 2 is an explanatory view showing a storage state of a wood material in a car for putting it into a depressurization pressurizer. The figure is an explanatory view showing the coloring process of the wood veneer in the present invention,
FIG. 4 is a plan view showing grooving on the surface of wood material, FIG. 5 is a partial sectional view showing the groove shape, FIG. 6 is a perspective view of a normal wood veneer, and FIG. 7 is a coloring adhesive. Explanatory drawing showing a step of laminating wood veneer on the applied plywood plywood, FIG. 8 is a perspective view showing the state of pasting, and FIG. 9 is a decorative veneer obtained in each of Reference Example and Comparative Reference Example. FIG. 1 ... wood veneer, 2 ... substrate plywood, 3 ... wood material, 5 ...
… Resin, 6… Conduit

Continuation of front page (72) Inventor Kawabata Adult 1048 Kadoma, Kadoma-shi, Osaka Matsushita Electric Works, Ltd. (56) Reference JP-A-60-190302 (JP, A)

Claims (1)

[Claims] 1. A step of adhering a wood veneer on a base plywood so that the fiber direction of the surface of the base plywood and the fiber direction of the wood veneer are orthogonal to each other to obtain a wood material, the wood material A step of impregnating the resin with a resin, a step of cleaning the resin-impregnated wood material with a solvent to remove the resin in the conduit of the wood veneer, and filling the resin in the conduit from which the resin has been removed with a resin. The heat-resistant flooring includes a step of curing, a step of removing the colored resin on the surface of the wood material after the resin is cured, and a step of sequentially applying an undercoat coating and a top coating to the surface of the wood material from which the colored resin has been removed. Production method.