JP5092437B2 - Floor construction method and floor - Google Patents

Description

  The present invention relates to a flooring construction method for use on an indoor floor surface in a building such as a detached house, a condominium, an apartment, a recreational facility, an office building, or a store, and a floor surface constructed by the construction method.

  At present, wood flooring materials are most prevalent as floor materials for indoor floors in buildings such as detached houses. This wood flooring material is a natural wood veneer with a thickness of about 5 mm to 15 mm or a natural wood veneer with a thickness of about several hundred μm to several mm on a wooden substrate such as a laminated plywood with a thickness of about 5 mm to 15 mm. They are pasted or painted products.

  These wooden flooring materials using natural wood have been widely accepted by consumers since the design of the surface is the most natural, familiar and beautiful design of natural wood.

However, it can easily discolor when exposed to sunlight, and can easily swell, crack, warp, corrode, peel off the veneer, etc. when it gets wet with water. It has been pointed out that there are problems in use, and that the quality, price, and supply amount of color tone and grain shape are unstable because it is a natural material.

In recent years, in particular, as social interest in the global environmental protection issue has increased, mass consumption of natural wood that leads to environmental destruction has become more common, and in the field of building materials such as flooring, the use of recycled resources The approach to has come to be required.

However, it is extremely difficult to recycle the wood flooring material as a flooring material, both technically and economically, and at most it is only crushed and recycled as a raw material for particleboard. This is also due to the lack of progress in application development in response to the rapid increase in supply in recent years, so there is an excess inventory, and recycling is in a deadlock situation. Most of the final disposal is done by landfill or incineration. .

Therefore, there is a strong social demand for the development of a recyclable flooring that can be reused as a raw material for the same kind of flooring after use. In order to meet these demands, the present inventors have already made a thermoplastic resin similar to the thermoplastic resin contained in the wooden resin molded body on the surface of the wooden resin molded body containing the thermoplastic resin and the wooden filler. A flooring made by laminating a decorative sheet mainly composed of a sheet was proposed (see Patent Document 1).

Since this flooring is mainly composed of thermoplastic resin, it has excellent water resistance and weather resistance, and it can supply a large quantity of products with stable quality in terms of physical properties and design, such as cutting and nailing. The processability is equivalent to that of the wood-based flooring material, and it has excellent recyclability such that it can be pulverized as it is after use and reused as a molding material for the wood resin molding.

In addition, the present inventors have further said wood resin molding for the purpose of improving adhesiveness with water-based or solvent-based adhesives, heat insulation that gives a warm touch similar to natural wood, elasticity that gives a pleasant walking feeling, etc. A floor material using a wood resin foam molded body obtained by foaming the body as a base material has also been proposed (see Patent Document 2).

However, as a result of the subsequent trial production, it has been found that there is a need for improvement in the resin-based flooring using the above-described wood resin foam molded article.
In the wood-based resin molded body that the present inventors have already proposed, a so-called plate-shaped foam molded body is continuously extruded and cut perpendicularly to the take-off direction to produce a base material. Usually, the linear expansion coefficient of the flooring material is determined by the amount of the wood filler to be blended, the production conditions, etc., and shows a uniform linear expansion coefficient for the flooring material produced continuously.

Since the resin-based flooring in the present invention is a flooring using a thermoplastic resin, thermal deformation with respect to environmental temperature changes occurs, but when a resin-based flooring having a uniform linear expansion coefficient is actually applied in this way. In addition, deformation of the resin-based flooring also occurs uniformly, and the entire floor surface also deforms uniformly. For example, stress concentration due to deformation occurs due to obstacles such as walls and pillars, and this can cause a push-up phenomenon. There is sex.
JP 2001-353815 A JP 2002-120347 A

  The present invention has been made in order to solve the above-described problems in the prior art, and the problem is that the base material is a wood resin foam molded article excellent in wood texture and recyclability. It is providing the floor surface constructed by the construction method of the resin-type floor material for suppressing the pushing-up phenomenon resulting from environmental temperature change, and the construction method.

The invention according to claim 1 is a resin-based flooring formed by laminating a woody resin foam molded body formed by foaming a woody resin composition containing at least a thermoplastic resin and a woody filler, and a decorative sheet. In the construction method, a part of the resin floor material in the longitudinal direction and the entire width direction of the resin floor material have a linear expansion coefficient of 0.2 × 10 in the longitudinal direction and the width direction of the resin floor material. ^-5 to ^{5.0 × 10 -5 (1 / ℃} ) is a construction method of a resin-based flooring, characterized in that to arrange so as to be in contact with different heterogeneous resin flooring in the following range.

  The invention according to claim 2 is characterized in that the dissimilar resin flooring contains the same amount of wood filler as the wood filler content of the resin flooring. This is a construction method for resin-based flooring.

  Invention of Claim 3 is constructed | assembled by the construction method of the resin-type flooring in any one of Claim 1 and 2, It is a floor surface characterized by the above-mentioned.

The invention according to claim 1 is a resin-based flooring formed by laminating a woody resin foam molded body formed by foaming a woody resin composition containing at least a thermoplastic resin and a woody filler, and a decorative sheet. In the construction method, a part of the resin floor material in the longitudinal direction and the entire width direction of the resin floor material have a linear expansion coefficient of 0.2 × 10 in the longitudinal direction and the width direction of the resin floor material. ^-5 to ^{5.0 × 10 -5 (1 / ℃} ) is a construction method of a resin-based flooring, characterized in that to arrange so as to be in contact with different heterogeneous resin flooring in the following range. By a construction method in which resin-based flooring materials having different linear expansion coefficients in the longitudinal direction and the width direction are arranged so that a part of the resin-based flooring material in the longitudinal direction and the entire width direction of the resin-based flooring material are in contact with each other. It is possible to alleviate stress concentration due to deformation of the entire floor surface due to environmental temperature change, and to prevent the push-up phenomenon.

The invention according to claim 2 is characterized in that the dissimilar resin flooring contains the same amount of wood filler as the wood filler content of the resin flooring. This is a construction method for resin-based flooring. The compounding amount of the wood filler has a strong correlation with not only the linear expansion coefficient but also the basic physical properties such as the surface hardness of the resin floor material and the dent resistance. It is possible to obtain a floor surface with unified basic physical properties by using a resin-based flooring with the same amount of wood-based filler.

Invention of Claim 3 is constructed | assembled by the construction method of the resin-type flooring in any one of Claim 1 and 2, It is a floor surface characterized by the above-mentioned. By being constructed by the construction method for a resin-based flooring according to any one of claims 1 and 2, a floor surface in which basic properties such as surface hardness and dent resistance are unified is obtained without causing a push-up phenomenon. It becomes possible.

  The construction method of the resin-type flooring of this invention is demonstrated with reference to FIG.

FIG. 1 shows an embodiment of a resin flooring construction example according to the present invention. The resin-based flooring materials 1 to 4 are resin-based flooring materials having the same blending amount of the wooden filler, but having different linear expansion coefficients in the longitudinal direction and the width direction. As a specific difference in linear expansion coefficient, it is necessary that the linear expansion coefficient be different in the range of 0.2 × 10 ^{−5 to} 5.0 × 10 ⁻⁵ (1 / ° C.). In the resin-based flooring of the present invention, the addition of the wood-based filler reduces the linear expansion coefficient of the flooring material compared to the thermoplastic resin alone, but the wood-based filler is in the longitudinal direction (take-off). From the relationship of orientation, the linear expansion coefficient in the width direction is larger than the linear expansion coefficient in the longitudinal direction. Although the linear expansion in the width direction can be reduced by suppressing the orientation, the linear expansion coefficient in the longitudinal direction increases accordingly. Thus, since the linear expansion coefficient in the width direction and the longitudinal direction have a correlation, when the same amount of wood filler is added, if the linear expansion coefficient in the width direction is different, the linear expansion coefficient in the longitudinal direction is different. Will also be different. In the present invention, even if the linear expansion coefficient is different within the range where the linear expansion coefficient in the width direction is less than 0.2 × 10 ⁻⁵ (1 / ° C.), the effect of preventing push-up cannot be obtained. It is difficult to produce a linear expansion coefficient exceeding 0.0 × 10 ⁻⁵ (1 / ° C.) under the same condition of the wood filler. The construction method of the resin-based flooring of the present invention is a method in which resin-based flooring having different linear expansion coefficients in the longitudinal direction and the width direction is partly and / or entirely in the longitudinal direction of the resin-based flooring, and / or The resin-based flooring is arranged so that part and / or all of the width direction of the resin-based flooring is in contact. For example, as shown in FIG. 1, a construction method in which all of the width directions of different resin-based floor materials appropriately selected from resin-based floor materials 1 to 4 are in contact with each other and a part in the longitudinal direction is in contact with each other. is there. By arranging in this way, the distribution of the coefficient of linear expansion (the amount of deformation due to heat) of the entire floor that has been constructed, compared with the case where the coefficient of linear expansion is uniform, the resin system with changes in environmental temperature Stress concentration due to deformation of the flooring material is reduced, and it becomes possible to improve the push-up phenomenon of the resin-based flooring material.

  Further, in the present invention, since the resin floor material in which the decorative sheet is laminated on the wood resin foam molded article is used, as shown in FIG. 2, the resin floor materials 1 to 4 having different linear expansion coefficients are arranged as described above. Even when it is made, there is no difference in appearance with respect to the constructed floor surface, and a floor surface excellent in design can be provided. In addition, as will be described later, by molding a wood resin foam molded body using the same mold, it is possible to mold a wood resin foam molded body with the same dimensions even if the linear expansion coefficients are different. In addition, since the blending amount of the wood filler is the same, there is no variation in basic physical properties in the floor surface.

Regarding the molding method of resin-based flooring materials 1 to 4 having different linear expansion coefficients, the adjustment of the linear expansion coefficient by the amount of wood-based filler is such that the amount of wood-based filler is the surface height of the resin-based flooring, dent resistance, etc. There is also a strong correlation with the basic physical properties, and it is not preferable to adjust the molding conditions, for example, by changing the take-up speed, from the viewpoint of foamability and production stability. Based on these points, the following method is effective as a method for producing a resin-based flooring material having a different coefficient of linear expansion used in the present invention, but is not limited to that method.

As a method for producing a resin floor material, a wood resin composition is foam-molded by an extruder to extrude a first foam-molded body having a rectangular cross section, and the first foam-molded body is dimensioned in the width direction of the inlet. The second foam molded body having a rectangular cross section is obtained by cooling while shaping the shape and dimensions by supplying to a sizing having a larger dimension in the width direction of the outlet than the second foam molded body with a take-up machine. A wood resin foam molded article made of the wood resin composition is obtained by pulling.
FIG. 3 is a schematic view of the sizing 10 used in the flooring manufacturing method of the present embodiment. The dimension L2 in the width direction of the outlet 14 of the sizing 10 is made larger than the dimension L1 in the width direction of the inlet 12 of the sizing 10. Further, in order to match the amount of resin at the inlet 12 and the outlet 14 of the sizing 10, the dimension in the thickness direction is designed to decrease as the dimension in the width direction increases. Specifically, when the dimension in the thickness direction of the inlet 12 of the sizing 10 is D1, and the dimension in the thickness direction of the outlet 14 of the sizing 10 is D2, L1 × D1 = L2 × D2.
As shown in FIG. 3, the resin flow in the sizing 10 is not only in the take-up direction by continuously changing from the dimension L1 in the width direction of the inlet 12 to the dimension L2 in the width direction of the outlet 14. It will also flow in the width direction. This makes it possible to control the orientation of the wood filler in the take-off direction, and to adjust the linear expansion coefficient in the longitudinal direction and width direction of the wood resin foam molded product without degrading the moldability and floor physical properties. Can do.

  FIG. 5 is a diagram showing a cross-sectional structure of an embodiment of a resin flooring. As shown in FIG. 5, the flooring 5 is formed on the wood resin foam molding layer formed by molding a mixture of a thermoplastic resin 4 and a wood filler 3 while bubbles 2 are present inside the foam. A decorative sheet 1 made of a thermoplastic resin similar to the plastic resin is laminated.

Examples of the thermoplastic resin 4 in the present invention include polyolefins such as polyethylene, polypropylene, polybutene, polyisoprene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-α-olefin copolymer, propylene-α. An olefin copolymer, an ethylene-ethyl acrylate copolymer, an acid-modified one of these for the purpose of improving adhesiveness, an ionomer or the like can be selected as appropriate, and a single type or a mixture of plural types may be used.

Among them, polypropylene resins such as homopolypropylene, random polypropylene, block polypropylene, and propylene-α-olefin copolymer are most suitable in terms of rigidity, surface hardness, dimensional stability, etc. required for the resin-based flooring 5. Yes.

However, polypropylene is a material having a large dimensional change with respect to temperature such as thermal expansion and contraction, that is, a so-called linear expansion coefficient. Since the resin-based flooring 5 proposed by the present invention is a composite of a thermoplastic resin and a wooden filler, the coefficient of linear expansion is smaller than that of a thermoplastic resin alone. However, when the room temperature is significantly higher than the temperature when the resin-based flooring 5 is constructed, the stress due to thermal expansion of the wooden resin foam molded body is accumulated in the width direction and the take-up direction, and the construction area is increased. In such a case, there is a possibility that the thrust may occur due to the concentration of these stresses in a part. Further, as described above, when the wood filler is filled, the linear expansion coefficient in the substrate width direction tends to be large due to the orientation of the wood filler in the take-up direction.

In the method for producing a resin floor material used in the construction method of the present invention, it is important to provide a widthwise taber in the sizing 10 in which the thermoplastic resin is cooled and solidified. For example, even if such a taper in the width direction is incorporated in the extruder die, considering the molten state and the viscosity of the resin in the sizing 10, the effect of suppressing the orientation of the wood filler in the take-up direction is obtained. Can not.

The ratio of the dimension L1 in the width direction of the inlet 12 of the sizing 10 and the dimension L2 in the width direction of the outlet 14 is preferably 2 or more than L1, and 3 to obtain the effect of controlling the orientation of the wood filler. More than double is desirable. If it is twice or less, the resin flow in the width direction in the sizing 10 is small, and as a result, it becomes difficult to control the linear expansion coefficient in the longitudinal direction and the linear expansion coefficient in the width direction of the molded flooring 5.

Further, regarding the ratio between the width direction dimension L1 of the inlet 12 and the width direction dimension L2 of the outlet 14, L2 is desirably 10 times or less of L1, and more desirably 5 times or less. As the ratio of L2 and L1 increases, the ratio of D2 and D1 also increases as described above, so that the aspect ratio L: D changes abruptly at the inlet 12 and outlet 14 of the sizing 10. Due to such a sudden change in shape, the size of the sizing 10 must be increased, and the stability of the base material molding is deteriorated.

In a conventional wood-based resin foam molding, a so-called floor-shaped foam molding is continuously extruded and cut perpendicularly to the take-off direction to produce a base material. For example, in the case of profile extrusion, the molten resin is cooled in sizing, and this is taken out at a desired speed by a take-up machine. In the wood-based resin foam molding, the linear expansion coefficient of the base material is improved by filling the wood-based filler, but the wood-based filler has a so-called fibrous structure with a high aspect ratio. Therefore, the wood filler tends to be oriented in the longitudinal direction. Due to this orientation of the wood filler, the produced floor base material has a non-uniformity that the thermal dimensional stability in the width direction is large (bad) compared to the linear expansion coefficient in the longitudinal direction.

The manufacturing method of resin-based flooring is characterized by the use of sizing that is designed with a wide sizing outlet width dimension L2 with respect to the inlet width dimension L1 of cooling sizing. The flow direction of the resin changes from the flow dominant in the take-up direction to the width direction, and as a result, the degree of orientation of the wood filler in the take-up direction can be controlled.

In the sizing used for molding, the sizing outlet width dimension L2 is not less than 2 times and not more than 10 times the sizing inlet dimension L1, and by taking the sizing within this range, the direction of taking the wood filler The degree of orientation can be controlled, and there are no problems with molding.

4A is an explanatory view showing the configuration of the sizing 10 used in the method for producing a resin-based foamed molded article of the present embodiment, FIG. 4B is a sectional view of FIG. 4A, and FIG. It is b sectional drawing. In general sizing, cooling water or the like is piped in the sizing to uniformly cool the entire sizing. However, in the sizing 10 in the present embodiment, the cooling part 26 of the sizing 10 is connected to the outlet 14 from the inlet 12 side of the sizing 10. It is designed to continuously increase in the width direction toward the side. By adopting such a design, when the resin moves in the sizing 10 in the take-up direction, the resin is continuously cooled from the central portion.

As shown in FIGS. 4B and 4C, the cooling part 26 of the sizing 10 is designed to enter the cooling part thickness D2 at the outlet 14 part of the sizing 10. The resin (first foamed molded product) that has entered from the inlet 12 of the sizing 10 is cooled from the center of the resin as it proceeds in the take-off direction, and since the thickness of the cooling section is D2, the resin center From the part, it is cooled and solidified with a thickness of D2.

When the resin center is cooled and solidified, the flow of the resin proceeds outward in the sizing 10 due to the difference in resin viscosity. This resin flow in the width direction makes it possible to more efficiently suppress the orientation of the wood filler in the take-up direction. That is, the resin (second foamed molded product) cooled by the cooling unit 26 and taken out from the outlet 14 by the take-up machine has a suppressed orientation of the wood filler in the take-up direction. This cooling condition makes it possible to control the orientation of the wood filler, and it is possible to obtain resin-based flooring materials having different linear expansion coefficients in the longitudinal direction and the width direction used in the present invention.

  The sizing 10 will be described in more detail with reference to FIGS. As shown in FIGS. 3 and 4A, the inlet 12 and the outlet 14 are connected by a shaping passage 16 for sizing cooling. As shown in FIGS. 4B and 4C, the side walls 18 located on both sides in the width direction of the sizing cooling shaping path 16 are provided so that the rectangular width gradually increases from the inlet 12 toward the outlet 14. It has been. The upper and lower walls 20 positioned on both sides in the height direction of the sizing cooling shaping path 16 are a flat wall 22 connected to both sides in the height direction of the inlet 12 and a sizing cooling shaping at the center in the width direction of the flat wall 22. And a projecting wall 24 provided so as to project into the passage 16. The width of the protruding wall 24 gradually increases from the inlet 12 toward the outlet 14, and matches the width of the outlet 14 at the outlet 14. The protruding wall 20 is cooled by a cooling medium such as water, and the protruding wall 20 constitutes the cooling unit 26.

  In the present invention, the material of the wood filler 3 used for the wood resin foam molded body can be selected without any particular restriction, but generally, the wood is broken by a cutter mill or the like, Use finely pulverized wood powder by ball mill or impeller mill.

The average particle diameter of the wood filler 3 is preferably 1 μm to 200 μm, and more preferably 10 μm to 150 μm. Those having an average particle size of less than 1 μm are difficult to handle, and particularly when the amount of the wood filler is large, the dispersion into the resin is poor and the mechanical strength of the wood resin foam molded article is lowered. On the other hand, if it is larger than 200 μm, the homogeneity, flatness and mechanical strength of the molded product are lowered.

  Moreover, about the compounding quantity of the wood type filler 3, although it can select suitably from 10 weight part to 300 weight part with respect to 100 weight part of the thermoplastic resin 4, in order to improve a moldability and homogeneity, The wood filler 3 is desirably 20 to 200 parts by weight, more preferably 30 to 150 parts by weight based on 100 parts by weight of the thermoplastic resin 4. If the amount of the wood filler 3 is too large, the flexural modulus of the flooring 5 will increase and the flexibility will be lost, so the workability will deteriorate, especially at the time of construction in the corner or when replacing one piece, It becomes difficult to work by bending the flooring 5, and it is easy to break when bent. On the other hand, if the amount is too small, the coefficient of linear expansion will increase and the dimensional stability will decrease. Therefore, due to temperature changes, gaps between the flooring materials 5 and floating due to the thrusting up of the flooring materials 5 will occur. Cause it.

  In the present invention, a foaming agent is added to the wood resin composition for molding the wood resin foam molded body in addition to the thermoplastic resin 4 and the wood filler 3 and foamed in the molding process.

In the present invention, the thermoplastic resin 4 is optionally added with a heat stabilizer, an acid neutralizer, an ultraviolet absorber, an antiblocking agent, a dehydrating agent, a light scattering agent for translucency, a gloss adjusting agent, and the like. You can also

Of these additives, heat stabilizers include hindered phenols, sulfur and phosphorus, acid neutralizers include stearic acid metal salts, hydrotalcite, etc., ultraviolet absorbers such as benzotriazole and benzoate. Benzophenone, triazine, etc., and light stabilizers include hindered amines.

In the present invention, an ordinary profile extrusion method can be used for forming the wood resin foam molded article. Among these, the SELKA molding method is preferable so that continuous and stable foam molding is possible.

Also, any known method can be used for the foaming method. In general, chemical foaming can be classified into chemical foaming, which generates gas by thermal decomposition or chemical reaction, and physical foaming, which heats and vaporizes low boiling point liquids. Ammonium, ammonium bicarbonate, ammonium nitrite, sodium borohydride, light metals, azide compounds, etc., and organic foaming agents such as azo, nitroso, hydrazide, etc. can be used in any combination.

In particular, physical foaming is mainly used for foaming at a high foaming ratio exceeding 2 times, and carbon dioxide gas or aliphatic hydrocarbons are mainly used as foaming agents. In addition, chemical foaming agents are often used in combination with physical foaming to adjust the cell shape of the foam.

  In the present invention, the kneading of the thermoplastic resin 4, the wood filler 3, the foaming agent and other additives constituting the wood resin composition is not particularly limited, but it is kneaded with a Banbury mixer and pelletized with a pelletizer. And a method of mixing and pelletizing with a twin-screw extrusion kneader. Moreover, since the wood filler 3 causes foaming during pelletization when the moisture content is large, it is desirable to suppress the moisture content to 8% or less in advance by using a dryer or a hopper dryer before kneading.

  In the flooring 5 of the present invention, a decorative sheet 1 mainly composed of a thermoplastic resin similar to the thermoplastic resin 4 is preferably laminated on the surface of the wood resin foam molded body. By using the same thermoplastic resin, recycling is possible without significant change in physical properties even when mixed during the recycling process.

  Specifically, for example, polyethylene, polypropylene, polybutene, polyisoprene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-α-olefin copolymer, propylene-α-olefin copolymer, ethylene- Ethyl acrylate copolymers, those modified with acids for the purpose of improving adhesiveness, ionomers, etc., or mixtures and copolymers thereof, can be selected as appropriate from various polyolefin resins. The same kind or different kinds of resins selected from the above can be used as the thermoplastic resin for the wood resin foam molding layer 4 and the decorative sheet 1.

  Furthermore, the flooring 5 of the present invention has a foam layer (not shown) mainly composed of a thermoplastic resin similar to the thermoplastic resin 4 contained in the wood resin foam molded body on the back surface of the wood resin foam molded body. ) May be laminated. For example, if a foam layer is laminated on the back side of the flooring 5, it absorbs unevenness of the floor base surface to prevent rattling, or absorbs impact sounds and walking sounds of articles on the floor surface. There are effects such as preventing noise.

  As a method for laminating the foamed layer, a known method can be used. For example, the thermoplastic resin 4 used in the woody resin composition for molding the woody resin foam molded body 1 is converted into a thermoplastic resin similar to the thermoplastic resin 4 or the like. A foamed molded article formed by foaming a sheet with a foaming agent that is either a chemical foaming agent that generates gas by reaction or a physical foaming agent that vaporizes by applying heat to a low-boiling point liquid. It can be formed by bonding 1 to the back surface which is not laminated.

  As described above, according to the present embodiment, in a construction method using a flooring material based on a wood resin foam molded article excellent in wood texture and recyclability, a push-up phenomenon caused by environmental temperature change is suppressed. In addition, it is possible to manufacture a resin-based flooring material for realizing the method of installing a resin-based flooring material used in the construction method according to the present invention.

(Manufacture of flooring materials 1-4)
Next, although the manufacturing method of the flooring material in this invention is demonstrated with a specific Example, this invention is not restrict | limited by an Example. 100 parts by weight of homopolypropylene resin in which 20% by weight of maleic acid-modified polypropylene resin is added to homopolypropylene resin as a thermoplastic resin, and wood as a wood filler is broken by a cutter mill, which is pulverized by a ball mill and finely divided. A wood resin composition having a mean particle diameter of 100 μm was mixed with 100 parts by weight using a twin-screw extrusion kneader and pelletized to prepare a woody resin composition. 3 parts by weight of triallyl isocyanurate and baking soda-citric acid foaming agent were added to 100 parts by weight of this wood resin composition, and extrusion molding was carried out by a single screw extruder. As the cooling sizing 10 attached to the extruder, the sizing 10 shown in FIGS. Based on sizing 10 dimensions of L1 = 50mm, D1 = 24mm, L2 = 200mm, D2 = 6mm, it is molded into a rectangular cross section with a foaming ratio of 1.4 times, a thickness of 6mm, and a width of 200mm, and further subjected to corona discharge treatment Thus, a floor material 1 which is a wood resin foam molded body was produced. In addition, floor materials 2 to 4 having different linear expansion coefficients in the longitudinal direction and the width direction were prepared by using the same mold and changing the sizing cooling temperature setting. Regarding the linear expansion coefficient of flooring materials 1 to 4, the floor material dimensional change was measured when the environmental temperature was changed from 0 ° C. to 60 ° C., and the linear expansion coefficient in the longitudinal direction and the substrate width direction was measured. Table 1 shows. Table 1 also shows the sizing cooling set temperatures in the molding of floor materials 1 to 4. In addition, the surface hardness of each flooring material is shown together with the value measured with a rubber hardness meter, but there is no significant difference because the amount of wood filler is the same, and there is also a particular difference in formability during extrusion molding. There was no.

On the other hand, 100 μm thick colored polypropylene sheet formed by blending random polypropylene with pigments such as iron oxide and titanium oxide is printed with urethane ink, and homopolypropylene resin is 100 μm by extrusion lamination method. A laminated sheet made of polypropylene resin was prepared by laminating simultaneously with embossing in thickness, applying a primer coat on the back side and a top coat on the surface. Thereafter, the decorative sheet was continuously produced by laminating the decorative sheet on the surface of the wood resin foam molded body by a lapping method, and the resin flooring of the present invention was produced.

(Performance evaluation)
The prepared flooring materials 1 to 4 were arranged as shown in FIG. 1, and were constructed in an environmental test chamber in an area of 3 m × 3 m under an environment of 5 ° C. The temperature in the environmental test chamber was cyclically changed from 5 ° C. to 40 ° C., and the presence or absence of push-up on the floor surface was confirmed.

<Comparative example>
Using only the flooring 1 prepared in the above-mentioned example, construction in an environmental test chamber and a cycle test were carried out, and the presence or absence of a push-up on the floor surface was confirmed.

  Regarding the examples and comparative examples, since the decorative sheets are laminated, the difference in appearance is naturally not observed. Further, as a result of the cycle test, a push-up phenomenon was confirmed in the comparative example, whereas a push-up phenomenon was not confirmed in the examples.

It is the schematic which shows one Example of the construction method of the resin-type flooring of this invention. It is the schematic which shows one Example of the construction method of the resin-type flooring of this invention. It is the schematic of the sizing 10 used for manufacture of the resin-type foaming molding from which a linear expansion coefficient differs. (A) is explanatory drawing which shows the structure of the sizing 10 used with the manufacturing method of the resin-type foaming molding from which a linear expansion coefficient differs, (B) is a sectional view of (A), (C) is b section of (A). FIG. It is a figure which shows the structure of the cross section of one Example of a flooring.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Decorative sheet 2 Air bubble 3 Wood filler 4 Thermoplastic resin 5 Floor material 10 Sizing 12 Inlet 14 Outlet L1 Inlet width direction dimension L2 Outlet width direction dimension 26 Cooling part

Claims (3)

In the construction method of a resinous floor material formed by laminating a woody resin foam molded body obtained by foaming a woody resin composition containing at least a thermoplastic resin and a woody filler, and a decorative sheet, the resinous floor material longitudinal entire width direction of a portion and the resin-based flooring is the said resin flooring longitudinal and width directions of the linear expansion coefficient of 0.2 × 10 ^-5 or more 5.0 × 10 ^{- 5} (1 / ° C.) A method for constructing a resin floor material, wherein the resin floor material is arranged so as to be in contact with different kinds of resin floor materials within a range of 1 (° C.) or less.   The construction method for a resinous flooring according to claim 1, wherein the different kind of resinous flooring contains the same amount of the woody filler as the amount of the woody filler in the resinous flooring.   A floor surface characterized by being constructed by the method for constructing a resin-based flooring according to claim 1.