JPS61257566A - Floor material for heating floor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a decorative plywood flooring for floor heating.

Prior Art and Problems Conventionally, it has been thought that decorative plywood cannot be used as a floor material for underfloor heating. This is because when decorative plywood is used as a flooring material for underfloor heating, not only will wrinkles of various depths and depths occur on the decorative surface, but also the upper part of the female part of the flooring material will warp or bulge. be.

These phenomena occur for the following reasons. When floor heating is used, the flooring is directly and continuously heated by a heat source from below, so it dries and shrinks as its moisture content decreases. On the other hand, when not in use, the room temperature decreases and the relative humidity increases, so the flooring material expands as the moisture content increases due to moisture absorption in the air. By the way, when floor heating is used at a rate of 20R, the moisture content of the flooring material decreases to about 2-4%, and increases to about 6-8% when not used in winter. Moreover, if we look at it throughout the year, from the rainy season to the summer, the relative humidity is 8.
The moisture content of the floor material increases to about 15 to 17%. Therefore, the annual moisture content change reaches about 13%. The dimensional change rate per 1% moisture content of plywood is 0.
03, so if the width of the flooring material is 300mm, then 13
% moisture content change results in a width change of 1.18 mm.

By the way, there are two types of fin phenomenon.

That is, one of them is deep fins (hereinafter referred to as ``deep fins'') extending from the base plate top plate to the decorative veneer. When raw wood is cut with a rotary race to obtain veneer, cracks inevitably occur. The back cracks that exist on the baseboard surface grow due to the repeated expansion and contraction of the flooring material, and spread from the baseboard surface to the decorative veneer. The other type is shallow fins (hereinafter referred to as A-type fins) that occur only on decorative veneers.

This also occurs mainly in the conduit portion of the decorative veneer due to the repeated expansion and contraction of the flooring material.

Next, when conventional decorative plywood is used as a heating floor material, FIG. 3 shows a warped state of the upper part of the female kernel, and FIG. 4 shows a raised state. In both figures, (1) is conventional decorative plywood used as flooring, (2) and (3) are the plywood and decorative veneer, (4) is male fruit, (5) is female fruit, (
6) is the upper part of the female fruit, (7) is the joist, (8) is the peg that fixes the decorative plywood (1) that is the flooring material to the joist (7),
(9) is the lower part of the female fruit, and this is the upper part of the female fruit (6
) longer (in cross section).

Since the male fruit (4) and the female fruit (5) are located approximately at the center of the thickness of the decorative plywood (1), the upper part of the female fruit (6) is thin enough to be affected by expansion and contraction. As a result, an anti-upward part (10) is generated at the point of contraction, and when it expands, stress is concentrated only in the upper part (6), which is longer than the lower part (9) of the female seed, and the swelling due to buckling occurs. An ascending section (11) occurs. If floor heating is installed when the moisture content of the floor material is low, the expansion will become significant during the rainy season.

An object of the present invention is to provide a flooring material using decorative plywood, which has conventionally been considered unusable.

Means for Solving the Problems In order to achieve the above object, the floor heating flooring according to the present invention has a base plate plywood and a top surface of the base plate plywood so that the fiber direction is perpendicular to the top surface of the base plate plywood. The anti-fail veneer is bonded, the decorative veneer is adhered to the top surface of the anti-fail veneer with the fiber direction perpendicular to this, and the polyurethane resin or polyurethane resin formed on the top surface of the decorative veneer. It is made of a vanity board with a coating made of resin that has the same effect as this, and a base, and the actual position is
It is placed near the lower end of the decorative plywood so that the upper part of the female kernel is thick enough to prevent deformation due to expansion and contraction.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS. 1 and 2.

Example 1 The flooring material for underfloor heating in this example consists of a 5-brie lauan base plywood (2) with a thickness of 11.5 mm, a length of 1820 mm, and a width of 310 mm, and the top surface of the top plate of the base plywood (2). The thickness is 0, which is glued with adhesive so that the fiber direction is perpendicular to this.
．． A 5mm lauan anti-flea veneer (12) and a 0.25mm thick cherry blossom decorative veneer (3 ), a transparent coating film (13) made of polyurethane resin formed on the upper surface of the decorative veneer (3), and a decorative plywood (14) comprising a male fruit (4) and a female fruit (5). be.

The positions of the fruit (4) and (5) are located near the lower end of the decorative plywood (14) so that the upper part of the female fruit (15) has a thickness that does not cause deformation due to expansion and contraction. There is.

That is, the width of the frontage of the pistil (5) is 4.5 mm, the thickness of the upper part of the pistil (14) is 5.3 mm, and the lower part of the pistil (14) is 5.3 mm.
6) had a thickness of 2.45 mm. Painting again! (13
), after sanding the top surface of the decorative veneer (3), apply 40 cJ/polyurethane resin paint using a roll coater.
This was obtained by applying the same paint for 70a/m2, performing intermediate sanding after drying, and then applying the same paint at 70a/m2 and drying.

FIG. 1 shows a state in which the decorative plywood (15) is installed as part of a floor heating system by lining up the decorative plywood (15) and fixing it to the joists (7) with pegs (8). In the figure, (17) is a plywood floor heating bottom plate, and (18) is a bottom plate (
17), decorative plywood (15) manufactured materials and adjacent joists (
7) is a heat insulating layer made of glass wool provided almost in the lower half of the air chamber (19) formed by the air chamber (19), and (20) is a hot water pipe placed on the top surface of the heat insulating layer (18). 60°C hot water is allowed to flow.

Example 2 This example is the same as Example 1 except that oak is used as the material for the decorative veneer (3).

Comparative Example 1 The floor heating floor material of this comparative example had a thickness of 12 mm, a length of 1 mm, and a length of 1 mm, as shown in Figures 3 and 4 above.
A 5-brie baseboard plywood (2) of 820mm and a width of 310mm, and a cherry blossom decoration of thickness Q and 3mm glued to the top surface of the top board of the baseboard plywood (2) so that the fiber direction is parallel to this. It is made of decorative plywood with a veneer (3), a male fruit (4), and a female fruit (5), and the upper surface of the decorative veneer (3) is coated with amino alkyd resin (as shown)
is formed.

The width of the opening of the pistil (5) is 4.5 mm, the thickness of the upper part (6) of the pistil is 3.7 mm, and the thickness of the lower part (9) of the pistil is 3.5 mm. gmm. Also, the coating film is Example 1
Same as above, it is applied twice, but the first coat is 40g/m2.2.
17m2 of 70C was applied for the second time. Comparative Example 2 In Comparative Example 2, 32 q/m 2 of non-singing paper was interposed between the base plywood (2) and the base plywood (3) in Comparative Example 1.

Regarding the flooring materials of the above examples and comparative examples: 300 mm x 3
Prepare 6 test pieces each with a diameter of 0.00 mm and soak them in warm water at 60°C for 40 minutes.
A dry-wet cycle test was conducted in which the sample was immersed for a period of time, then dried at 60°C for 96 hours, and this cycle was repeated up to 3 cycles, and a continuous drying test was conducted in which the sample was dried at 90°C for 96 hours. The evaluation criteria for the test results are as shown in Table 1.
(hereinafter referred to as B) are summarized in Table 2.

Table 1 Table 2 The occurrence of surface type fins is prevented by a fin-preventing veneer interposed between the top plate of the base plywood and the decorative veneer so that the fiber directions are perpendicular to each other. be given The non-sized paper in Comparative Example 2 was also used for the purpose of preventing D-type fins, but it was found that it was not very effective as it was torn as the D-type fins grew.

Anti-finger veneers are of little use against Type A fins, but a coating made of polyurethane resin can almost prevent this from occurring. As shown in Comparative Examples 1 and 2, amino alkyd resins are commonly used as conventional floor paints, but this paint film not only shrinks over time, but also undergoes dimensional changes due to expansion and contraction of the flooring material. Cracks occur in the paint film due to the inability to respond to these conditions.

However, since the coating film made of polyurethane resin has a small shrinkage rate and a high elongation rate, it can follow the above-mentioned dimensional changes, and almost no A-type wrinkles occur. Furthermore, since polyurethane resin has excellent weather resistance, it does not deteriorate much even when heated for a long period of time. Note that polyurethane resin paints are modified with acrylic resin to improve drying properties, but
If the proportion of acrylic resin is large, the coating film becomes hard and the elongation rate decreases, so acrylic resin is not added, but even if it is added, it is desirable that the proportion is small. Furthermore, the coating film-forming resin is not limited to polyurethane resins, but resins with the same effect can also be used.

In addition, the actual position is located near the lower end of the decorative plywood so that the upper part of the female material is thick enough to prevent deformation due to expansion and contraction, so when the flooring material contracts, the female material will be removed. The upper part does not warp, and even if stress concentration occurs due to butting against adjacent flooring materials when it expands, it can withstand this and no bulges will occur.

Effects of the Invention The floor heating flooring of the present invention is made of a decorative board, but as mentioned above, the anti-fine veneer prevents the occurrence of D-type fins, and the material is made of polyethylene resin or a resin with the same effect. The coating film prevents A-type fins from forming, and the actual position is located near the lower end of the decorative plywood so that the upper part of the female kernel is thick enough to avoid deformation due to expansion and contraction. By being present, the floor surface is always kept flush.

[Brief explanation of drawings]

Figures 1 and 2 show examples of the present invention, with Figure 1 being a vertical sectional view of a floor heating system using the flooring material according to the present invention, and Figure 2 showing the coating film and decorative veneer in one piece. FIG. 3 is a plan view with parts removed one by one. Figures 3 and 4 are vertical cross-sectional views showing the deformation state when conventional decorative plywood is used for floor heating. Each figure shows the case of expansion. (2)... Base plywood, (3)... Decorative veneer, (12
)...Flea prevention veneer, (13)...paint film, (14
)... Decorative plywood, (15,)... Upper part of the female fruit. that's all

Claims (1)

[Claims] A base plate plywood (2), a fin-preventing veneer (12) bonded to the top surface of the top plate of the base plate plywood (2) so that the fiber direction is perpendicular to this, and a fin-preventing veneer (12). Decorative veneer (3) glued to the top surface of ) with the fiber direction perpendicular to this
and a coating film (13) made of polyurethane resin or a resin with the same effect formed on the upper surface of the decorative veneer (3),
Made of decorative plywood (14) with nuts (4) and (5),
The floor heating floor material is located near the lower end of the decorative plywood (14) so that the actual position is thick enough to prevent deformation due to expansion and contraction in the upper part of the female part (15). .