JPS5853391Y2 - Thin decorative flooring - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a double adhesive flooring material, that is, a thin wooden decorative flooring material that is constructed on a base made of thick plywood spread over joists.

The following three conditions are required for this type of flooring material.

(i) Since this flooring material is constructed on a strong base, bending fracture strength is not required.

Therefore, it is desirable that the plywood used as the base material be as thin as possible in order to reduce costs, and it is also desirable that the number of plies (constituent sheets) of the plywood be as small as possible.

(ii) On the other hand, the flooring material must not cause differences in levels or gaps at the joints.

It also needs to be constructed so that the nail heads are not visible.

From these points, it is necessary to meet the above requirement (1), and also to allow the joining portion to be processed into a burr.

(iii) If the flooring material is warped, it is necessary to press the floorboard against the base and fit the floorboards together during construction, and the number of nailing points must be increased, resulting in extremely poor work efficiency.

Therefore, it is necessary to have as little warpage as possible.

The present invention aims to provide a flooring material that satisfies the above conditions.

To explain the present invention based on the drawings, FIGS. 1 and 2 are a plan view and a sectional view, respectively, of a flooring material 1 which is an embodiment of the present invention, and FIG. 3 shows the constituent materials of the flooring material 1 separated. This shows the state in which the

In these figures, the flooring material 1 is 5. A decorative material 3 made of a 0.25 mm Asada veneer or the like is pasted on the surface of the Qmm 3-ply plywood 2, and a backing veneer 4 made of a 0.65 mm lauan veneer or the like is pasted on the back side of the 3-ply plywood 2. It is pasted so that the direction is perpendicular to that of the back side of the plywood (hereinafter referred to as orthogonal pasting).

). Further, on the end faces of the four peripheries, the convex strips 5 and the grooves 6 for real dots shown in FIGS. 1 and 2 are formed.

The upper and lower protrusions 6 a of the protrusions 5 and grooves 6,
6b is formed to include two types of veneers with different fiber directions.

As the decorative material, in addition to decorative veneer, melamine or other composite or resin decorative boards, pattern-impregnated paper, etc. can be used.

Various types of backing veneer can be used as the backing veneer to be attached to the back side of the plywood, but among them, lauan plywood is easy to use.

The thickness and moisture content of the veneer must be determined in balance with the decorative material. Specifically, as a decorative material, Q, 25m
When using a decorative veneer of about m, the thickness of the back lauan veneer (water content 5%) is approximately 0.5 to 1, 5 mm.

As the plywood, 3-ply lauan plywood having a thickness of 4.0 to 5.5 mm is preferably used.

Regarding the manufacturing method, the size of floor material 1 is 30 x 180 cm.
It is best to use approximately 90 x plywood.
It is advantageous to use a piece with a size of about 180 cm and cut it to a predetermined size in a subsequent process.

Adhesion of decorative materials and backing veneer to 3-ply plywood is done separately.
Alternatively, it may be done at the same time, or it is more advantageous to do it at the same time in that warping is less likely to occur during the process.

It goes without saying that the surface of the flooring material is finished by appropriate polishing and painting (not shown) during the manufacturing process.

The present invention uses four-ply plywood with substantially abutting veneers arranged orthogonally to each other.

However, 4-ply plywood is not commercially available because the front and back sides are not balanced and warping occurs, but if 4-ply plywood like the one shown in 2 can be manufactured, it could be used for the product of this invention. Of course there is.

Next, three reasons for attaching the backing veneer orthogonally to the back side of the 3-brie plywood will be explained.

(i) Using 3-ply plywood and pasting decorative material on the surface,
Furthermore, when the surface is painted, the adhesive layer and the coating shrink, so that warping that makes the surface concave inevitably occurs, and this becomes more pronounced as the thickness of the plywood becomes thinner.

Therefore, it is necessary to attach a balancer that can be anastomoses with the decorative material to the back side of the plywood.

(ii) When decorative pasting is applied to 3-ply plywood and the material is added, no matter what shape the material is attached to, a portion with higher handling strength will be created somewhere on the four end faces.

This will be explained with reference to FIG.

Figure 4 shows the flooring in Figure 1 made of only 3-ply plywood, each with a different fruit.
It is a sectional view seen from the direction of the line BB in the figure, and the opening and C of the figure are sectional views seen from the direction of the line A-A in the figure.

In FIG. 4A, a protruding strip is formed on the center core 2C of the plywood.

Here, since the upper protruding part 8a of the groove is formed from the top plate 2a and the center core 2C perpendicular to the top plate 2a, there is no problem in terms of strength.

Similarly, the lower protrusion 8b is also formed from the back plate 2b and the core plate 2C perpendicular to the back plate 2b, so there is no problem.

However, the protrusions 7 are only the core, the fiber direction of which is parallel to the end surface of the flooring material, and the thickness of the protrusions is quite thin, so they easily break during handling or construction.

On the other hand, in the opening of FIG. 4, the protrusions and grooves are formed closer to the surface than the center line of the plywood, that is, so as to span the center core and the top plate.

Therefore, for the same reason as in case A of the same figure, the upper protrusion 8 of the groove
a becomes weak in strength.

In addition, in Fig. 4C, the protrusions are made thicker and are formed so as to span the front plate, the center core, and the back plate, so that the protruding portions 8a of the concave grooves,
8b becomes weak in strength.

On the other hand, in the product of the present invention, the backing veneer is pasted at right angles to form a 4-ply plywood. 6 a, 6
b can be formed to include two types of veneers with different fiber directions, and the strength of the above-mentioned fruit is maintained high.

This also applies to the fruit in the cross section taken along the line B--B in FIG.

The position where the veneer processing is applied does not necessarily have to be at the center of the board, but it should be placed slightly toward the surface in accordance with the veneer configuration so that each part of the veneer contains two types of veneers with different fiber directions. Alternatively, it may be closer to the back side.

(iii) For the purpose of preventing warping as described in (i) above, the backing veneer as a balancer may be either parallel or orthogonal, but as shown in Figure 5 A, lauan veneer is attached to the back of the plywood,
If the plywood is attached with its fiber direction parallel to that of the back surface of the plywood, the concave groove protrusion 9b becomes weak.

As a modification of this, the lauan veneer may be made thicker to reinforce the 9b portion as shown in Figure 5, but this would be difficult to meet the requirement of reducing the overall thickness.

Therefore, from this point of view as well, the backing veneer needs to be applied at right angles.

To summarize the effects of this invention, since the backing veneer is pasted orthogonally on the back side of the 3-ply plywood, it is possible to prevent the warping that inevitably occurs with 3-ply plywood, and this also allows each part of the fruit to be attached to the fibers. Since it can be formed to include two types of veneers with different directions, it is possible to maintain high strength in each part of the fruit (experimentally it was possible to achieve a strength of 5.0 to 5.Qmm). We succeeded in lowering the overall cost l-.

As described above, the product of the present invention has excellent effects as a thin decorative flooring material.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention. Figure 1 is a plan view of the flooring, Figure 2 is A-A in Figure 1.
A line sectional view, FIG. 3 is a perspective view showing the constituent materials of the flooring material separated, and FIGS. 4 and 5 are sectional views for comparative explanation. 1...flooring, 2...3 ply plywood, 3
... Decorative material, 4... Backing veneer, 5...
...Convex strip, 6...Concave groove, 6a...
Upper protrusion of the groove, 6b...lower protrusion of the groove.

Claims (2)

[Scope of utility model registration request] (1) A decorative material is pasted on the surface of the 3-ply plywood, and a thin backing veneer is pasted on the back side in a perpendicular manner, and convex stripes and grooves for real grains are formed on the end faces of the four peripheries. A thin decorative flooring material characterized in that the upper and lower protrusions of the protrusions and grooves are formed to include two types of veneers with different fiber directions. (2) The thin decorative flooring material according to claim 1, wherein the decorative material is a decorative veneer.