JP5256697B2 - MANUFACTURING METHOD FOR WOOD-BASED RESIN FOAM-MOLDED BODY, WOOD-BASED RESIN FOAM-MOLDED BODY, AND FLOOR MATERIAL USING THE SAME - Google Patents

Description

  The present invention relates to floor materials for use on indoor floors in buildings such as detached houses, condominiums, apartments, recreational facilities, office buildings, stores, etc., and wood-based resin foam moldings used for these floor materials, and It relates to the manufacturing method.

  At present, wood flooring materials are most prevalent as floor materials for indoor floors in buildings such as detached houses. This wood-based flooring material is a natural wood veneer with a thickness of several hundreds μm to several mm on a solid wood substrate such as a natural wood plate with a thickness of about 5 to 15 mm or a laminated plywood with a thickness of about 5 to 15 mm. Or a coated product thereof.

  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 is easy to discolor when exposed to sunlight, and when it gets wet, it tends to swell, crack, warp, corrode, peel off the veneer, etc., especially in areas such as bathroom dressing rooms, washrooms, kitchens, etc. 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.

  Particularly in recent years, as social interest in global environmental protection issues has increased, mass consumption of natural timber that leads to environmental destruction has become a perception, and the use of recycled resources in the field of building materials such as flooring 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. In many cases, the material is simply crushed and recycled as a raw material for particleboard. This is also due to the fact that there is an excess inventory due to the lack of progress in application development in response to the rapid increase in supply in recent years, and recycling is in a deadlock situation. Most of the final disposal by landfill or incineration is currently underway is there.

  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 such a demand, the present inventors have already made the same system as the thermoplastic resin contained in the wood resin molding on the surface of the wood resin molding containing the thermoplastic resin and the wood filler. A flooring made of laminated decorative sheets mainly composed of thermoplastic resin was proposed.

  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 and reused as a molding material for the wood-based resin molding after use.

In addition, the present inventors have further made improvements in the wood-based resin for the purpose of improving adhesiveness with water-based or solvent-based adhesives, heat insulation that gives a warm touch similar to natural wood, and elasticity that gives a pleasant walking feeling. A floor material using a wood-based resin foam molded body obtained by foaming a molded body as a base material has also been proposed.
JP 2001-353815 A JP 2002-120347 A

  However, as a result of the subsequent trial production, the importance of further improvement was confirmed for the flooring material using the above-described wood-based resin foam molding. In other words, since this flooring is a flooring using a thermoplastic resin, thermal deformation occurs due to environmental temperature changes, and there is a concern that the flooring may be clogged or pushed up, and as a molding method, a profile extrusion process, etc. The floor material that is continuously molded in is cut to the desired dimensions and applied as the floor material. However, the thermal dimensional stability in the take-off direction and the thermal dimensional stability in the direction perpendicular to the take-off direction (base material width direction) Make a difference.

  The present invention has been made in view of the above circumstances, and has excellent thermal dimensional stability without increasing the production process. In addition, the difference between the thermal dimensional stability in the take-up direction and the thermal dimensional stability in the substrate width direction. It is an object of the present invention to provide a method for producing a wood-based resin foam molded body with a reduced amount, a wood-based resin foam molded body manufactured by the manufacturing method, and a flooring using the same.

In order to solve the above problems, the present invention employs the following configuration.
[1] A wood-based resin foam material obtained by melting and foaming a wood-based resin composition containing at least a thermoplastic resin, a wood-based filler, and a foaming agent is extruded from a mold and molded by passing through a sliding sizing mold. And passing a non-woven fabric made of the same type of thermoplastic resin as the thermoplastic resin between the wood-based resin foam material and a sliding sizing mold, and bonding the non-woven fabric to the surface of the wood-based resin foam material. A method for producing a wood-based resin foam molded body integrally molded with a wood-based resin foam molded body,
The wood filler is mixed with the wood resin composition with a moisture content of 8% or less,
The non-woven fabric is a long-fiber non-woven fabric comprising a core-sheath composite long fiber having polyester as a core component, polyolefin as a sheath component, and a melting point of the core component being 40 ° C. or higher than the melting point of the sheath component. method for manufacturing textiles is of the woody woody resin foam-molded body characterized by being arranged at random in all directions of the resin foam molding body.
[2 ] A wood-based resin foam molded article produced by the method for producing a wood-based resin foam molded article according to [1 ] .
[ 3 ] A flooring comprising a decorative sheet laminated on the surface of the woody resin foam molded article according to [ 2 ].

  According to the method for producing a wood-based resin foam molded body of the present invention, when passing a wood-based resin foam material through a sliding sizing mold, a nonwoven fabric made of a thermoplastic resin is removed from the wood-based resin foam material and the sliding sizing mold. Passing between them reduces the sliding resistance of the wood-based resin foam material made of thermoplastic resin melt and the sliding sizing mold, and can respond to various molding conditions by giving strength to the entire resin during take-up It becomes like this. In other words, because non-woven fabric made of thermoplastic resin can eliminate factors that could not be molded, such as resin breakage and deformation, soft materials, filler-filled materials, and high-foaming materials that could not be molded by conventional extrusion methods. It is possible to easily produce a stable wood-based resin foam-molded product with respect to a foam with a magnification.

  In addition, by using the same type of material for the nonwoven fabric made of thermoplastic resin and the thermoplastic resin used in the woody resin composition, the woody system is produced by the pressure applied to the sliding sizing mold by the foaming gas and the heat of the molten resin. The resin foam material and the nonwoven fabric are firmly bonded, and the function of the composite nonwoven fabric can be directly imparted to the wood-based resin foam molding. The production method of the present invention has a great merit in terms of cost and the like due to increased adhesiveness and steps as compared with the case where the foamed molded body and the nonwoven fabric are laminated by extrusion after forming by extrusion.

  Further, in the method for producing a woody resin foam molded article of the present invention, the use of a core-sheath-type long fiber nonwoven fabric as the nonwoven fabric results in higher strength of the nonwoven fabric than when a polyolefin single-component long-fiber nonwoven fabric is used. In addition, it is advantageous in terms of adhesiveness with the wood-based resin foam molded article, compared with the case where a polyester single component long fiber nonwoven fabric is used.

  Furthermore, when there is a difference of 40 ° C. or more in the melting point of the sheath component and the core component, when the nonwoven fabric is melted and adhered in the woody resin composition melt and sliding sizing, the polyester length as the core component is increased. Since the fiber does not melt, the fiber shape is maintained in the laminated nonwoven fabric portion. Thereby, the thermal dimensional stability in the final floor material is improved, and it is possible to prevent problems such as push-up and open spaces. If the difference between the melting points of the core component and the sheath component is less than 40 ° C., the fiber shape of the polyester long fiber collapses, and the effects of the present invention cannot be obtained. A polyester having a small melting point and a low melting point is not preferable because of poor productivity and operability and high cost.

In addition, in the wood-based resin foam molded products that have been proposed so far, so-called floor-shaped foam molded products are 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 molded article produced in this way, the thermal dimensional stability (linear expansion coefficient) of the base material can be improved by filling the wood-based filler, but the wood-based filler has a high aspect ratio. Due to the so-called fibrous structure, it tends to be oriented in the take-up direction. Due to the orientation of the wood filler, the produced floor base material has a non-uniformity that the thermal dimensional stability in the width direction is worse than the thermal dimensional stability in the take-off direction.

In addition, the flooring material based on the wood-based resin foam molded body of the present invention has excellent thermal dimensional stability without increasing the production process, in addition to the thermal dimensional stability in the take-off direction and the base material width direction. There is little difference in thermal dimensional stability.
It is possible to improve the thermal stability of the flooring material by laminating the nonwoven fabric on the wood-based resin foam molded body constituting the flooring material. In addition, when a long-fiber nonwoven fabric is used, the fiber arrangement is randomly arranged in the take-up direction and the width direction. Therefore, the thermal dimensional stability in the take-up direction and the width direction by the conventional molding method is not good. Uniformity can be relaxed.
As a result of the verification so far, there are many cases where the floor base push-up phenomenon caused by thermal dimensional stability occurs in the base width direction compared to the take-up direction. For this reason, improving the non-uniformity of the thermal dimensional stability in the take-up direction and the substrate width direction is effective for preventing problems caused by the thermal dimensional stability of the flooring.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to this embodiment.

An example of a method for producing the woody resin foam molded article of the present invention will be described.
First, a wood-based resin foam material 12 made of a thermoplastic resin to which a foaming agent, a wood filler, various additives and the like are appropriately added is placed in a hopper 10a of an extrusion apparatus H as shown in FIG. The wood-based resin foamed material 12 obtained by kneading while being heat plasticized is extruded from an extrusion die 11 (die) attached to the tip of the extruder 10 to form a sliding sizing die 14. Introduce.

When the wooden resin foam material 12 is introduced into the sliding sizing mold 14, the non-woven fabric 13 is bonded to the surface of the wooden resin foam material 12 while the wooden resin foam material 12 and the inner wall surface 14 a of the sliding sizing mold 14. Insert between.
Thereafter, the nonwoven fabric 13 is sent in the flow direction (the direction of the white arrow in FIG. 1) together with the wooden resin foam material 12 in a state of covering the wooden resin foam material 12. In the sliding sizing die 14, the wood-based resin foam material 12 cooled and solidified to such an extent that it does not deform due to its own weight is taken out (demolded) from the sliding sizing die 14 by the acting force of the take-up machine 16. Then, after sufficiently cooling by passing through the cooling water tank 15, it is sent to the cutting table 17 and cut into a predetermined size. In this way, the woody resin foam molding S with the nonwoven fabric 13 which is the target product is obtained.

  The nonwoven fabric 13 to be inserted into the sliding sizing mold 14 can be bonded to both surfaces of the wood-based resin foam material 12, for example, when the floor material surface needs to be smooth, the wood-based resin foam material 12. It is also possible to laminate the nonwoven fabric 13 only on any one of the above, and it may be selected in a timely manner according to the application.

  The extrusion die 11 only needs to have a mechanism for continuously extruding a thermoplastic resin melt, and examples thereof include a T die and a dying die. Since the extrusion die 11 is close to the sliding sizing die 14 and positioning is also important, a contact surface is often provided, and heat insulation is important. At the same time, in addition to the heater, existing circulation such as oil circulation is necessary. It is desirable to maintain the temperature of the extrusion die 11 using a technique.

  The sliding sizing die 14 (also referred to as a calibrator die, a guide die, etc.) has an inner wall surface 14a whose cross-sectional shape is precisely manufactured according to the cross-sectional shape of the molded body to be manufactured. The wood-based resin having a designed cross-sectional shape that accurately copies the cross-sectional shape of the inner wall surface 14a of the sliding sizing mold 14 by the wood-based resin foam material 12 being cooled and solidified while being pressed by its own foaming pressure. The foamed molded product S can be manufactured stably.

  The existing design method is also used for the sliding sizing mold 14. Generally, a material having high thermal conductivity such as brass or aluminum is used, and a flow path for circulating a coolant such as water is provided. This flow path is provided at a position close to the flow surface of the resin by appropriately adjusting the dimensions according to the Reynolds number or the like so as to become a turbulent flow in order to enhance the cooling effect. Further, the sliding sizing mold 14 can be disposed in water, and in this case, a vacuum slit or the like for sucking out water entering the sliding sizing mold 14 can be provided.

Such a foam extrusion molding method is not particularly limited, but the Celca method is preferable. As shown in FIG. 2, the Celcer method has an inner wall surface dimension that is substantially the same as the size of a molded body to be manufactured, and an extruded metal having a torpedo 20 (also referred to as a mandrel, a core, etc.) installed therein Using the mold 11, the wood-based resin foam material 12 is extruded in a hollow state, introduced into the sliding sizing mold 14 in a state where the foaming has hardly progressed, and foamed mainly toward the inner cavity portion inside the mold 11. It is a method to make it.
According to this method, the extruded wood-based resin foam material 12 is foamed toward the internal cavity in the sliding sizing mold 14, and as a reaction, the surface layer portion is slipped inside the sliding sizing mold 14. Since the pressure which strongly presses toward the wall surface 14a, ie, toward the nonwoven fabric 13, is generated, there is an advantage that the wooden resin foam material 12 and the nonwoven fabric 13 can be firmly bonded.

  Examples of the thermoplastic resin constituting the wood-based resin foam molded body S 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-olefin copolymer, ethylene-ethyl acrylate copolymer, those obtained by acid modification for the purpose of improving adhesiveness, ionomer, etc. can be selected as appropriate. However, a mixture of multiple 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 and the like required for flooring materials.

  However, polypropylene is a material having a large dimensional change with respect to temperature such as thermal expansion and thermal contraction, that is, a so-called linear expansion coefficient. Our proposed flooring is a composite of a thermoplastic resin and a wood-based filler, so the linear expansion coefficient is smaller than that of a single thermoplastic resin. However, when the room temperature is significantly higher than the temperature when the flooring is applied, the stress due to the thermal expansion of the wood-based resin foam molded body S is accumulated in the width direction and the take-up direction, and the construction area is widened. In some cases, these stresses are concentrated on a part, and the push-up may occur. 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.

The non-woven fabric 13 is preferably a long-fiber non-woven fabric comprising a core-sheath composite long fiber having polyester as a core component, polyolefin as a sheath component, and a melting point of the core component being 40 ° C. or higher than the melting point of the sheath component. .
Examples of the polyester used as the core component include polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, and polytrimethylene terephthalate.
Examples of the polyolefin used as the sheath component include polyethylene, polypropylene, polybutene, polyisoprene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-α-olefin copolymer, propylene-α-olefin copolymer. A polymer, an ethylene-ethyl acrylate copolymer, an acid-modified polymer of these for the purpose of improving adhesiveness, an ionomer, or the like can be appropriately selected.

In the present invention, from the viewpoint of melt-adhering the wood-based resin foam material 12 and the nonwoven fabric 13 in the sliding sizing 14, the polyolefin of the sheath component is preferably the same resin as the thermoplastic resin used for the wood-based resin foam material 12. For the above reasons, it is more preferable to use a polypropylene resin.
A method for producing such a long-fiber nonwoven fabric can be selected without any particular limitation, but a generally known spunbond method by melt composite spinning can be applied. A spun yarn obtained by melt spinning is thinned with a suction device, taken up, opened, accumulated on a conveyor net, and then hot-pressed with a hot embossing device to obtain a long fiber nonwoven fabric.

In the present invention, the wood-based resin foam material 12 and the nonwoven fabric 13 are melt-adhered by the heat of the melt of the wood-based resin foam material 12 within the sliding sizing 14, but only the polyolefin that is the sheath component of the core-sheath type long fiber is used. The polyester component that is melt-adhered and maintains the state of the nonwoven fabric is applied to the foam in the form of long fibers. This makes it possible to improve the thermal stability of the final flooring material. However, the environmental temperature of the nonwoven fabric layer increases due to the heat shrinkability associated with the low-temperature crystallization of the polyester fiber as the core component. In this case, a deformation that shrinks in the case of the occurrence of the deformation causes an effect of suppressing the pushing-up behavior due to the thermal expansion of the flooring.
In addition, in the conventional molding method, it is difficult to suppress thermal deformation in the width direction of the flooring due to the take-up stress applied to the molding. As can be seen from the method, the polyester long fibers as the core component are randomly arranged in all directions, and the thermal deformation in the width direction of the flooring can be efficiently suppressed.

  In the present invention, the material of the wood filler contained in the wood resin composition can be selected without any particular restriction, but generally, the wood is broken by a cutter mill or the like, and this is cut into a ball mill. Or finely pulverized (wood powder) using an or impeller mill.

  1-200 micrometers is preferable and, as for the average particle diameter of a wood type filler, 10-150 micrometers is more preferable. Machines with an average particle size of less than 1 μm are difficult to handle, and especially when the amount of the wood filler is large, the dispersion of the resin is poor, and the resulting wood resin foam molded body S is obtained. The strength tends to decrease. On the other hand, if it is larger than 200 μm, the homogeneity, flatness and mechanical strength of the molded product tend to be lowered.

  Further, the amount of the wood filler can be appropriately selected from 10 parts by weight to 300 parts by weight with respect to 100 parts by weight of the thermoplastic resin. The filler is desirably blended in an amount of 20 to 200 parts by weight, more preferably 30 to 150 parts by weight with respect to 100 parts by weight of the thermoplastic resin. If the amount of the wood filler is too large, the bending elastic modulus of the flooring will increase and the flexibility will be lost, so the workability will deteriorate (especially when flooring or when replacing one piece, It becomes difficult to work by bending the material), 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, which may cause gaps between the flooring materials and floating due to the thrusting of the flooring materials due to temperature changes. Become.

In the present invention, the wood resin composition used for the wood resin foam material 12 is foamed in the molding process by adding a foaming agent in addition to the thermoplastic resin and the wood filler.
If necessary, a heat stabilizer, an acid neutralizer, an ultraviolet absorber, an antiblocking agent, a dehydrating agent, a light scattering agent for making translucent, a gloss adjusting agent, and the like can be added to the thermoplastic resin. .
Among these additives, heat stabilizers include hindered phenols, sulfurs, and phosphoruss, acid neutralizers include stearic acid metal salts and hydrotalcite, and ultraviolet absorbers include benzotriazole. Type, benzoate type, benzophenone type, triazine type, etc., and light stabilizers include hindered amine type.

  Further, the foaming technique is not particularly limited, and any known technique can be used. In general, chemical foaming can be classified into chemical foaming, which generates gas by thermal decomposition or chemical reaction, and physical foaming, which heats a low-boiling point liquid to vaporize, and chemical foaming agents include inorganic sodium bicarbonate and carbonic acid. 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 and aliphatic hydrocarbons are mainly used as foaming agents. In addition, a chemical foaming agent is often used in combination with physical foaming to adjust the cell shape of the foam.

  In the present invention, the kneading method of the thermoplastic resin, the wood filler, the foaming agent and other additives contained in the wood resin composition is not particularly limited, and is kneaded by a Banbury mixer and pelletized by a pelletizer. A general method such as a method of mixing and pelletizing by a twin-screw extrusion kneader can be used. In addition, if the wood filler has a high moisture content, foaming may cause foaming during pelletization. Therefore, it is desirable to suppress the moisture content to 8% or less in advance using a dryer or hopper dryer before kneading.

  In the flooring of the present invention, a decorative sheet mainly composed of a thermoplastic resin similar to the thermoplastic resin of the foam molded body is preferably laminated on the surface of the wood-based resin foam molded body S. By using the same thermoplastic resin, recycling is possible without significant change in physical properties even when mixed during the recycling process. In addition, the decorative sheet may be laminated on both surfaces of the surface of the wood-based resin foam molded body S, or may be laminated only on any one surface, and the laminated portion is a part of the whole surface or a part thereof. Also good.

  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 obtained by acid modification for the purpose of improving adhesiveness, ionomers, mixtures thereof, copolymers, and the like can be appropriately selected from various polyolefin resins. The same or different resins selected from these can be used as thermoplastic resins for the wood-based resin foam molding layer and the decorative sheet.

  The flooring of the present invention thus obtained has excellent thermal dimensional stability without increasing the number of production steps, and in addition, the difference between the thermal dimensional stability in the take-up direction and the thermal dimensional stability in the substrate width direction. There are few.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated, this invention is not limited to a following example.

<Example 1>
A core-sheath type non-woven fabric was used as the nonwoven fabric to produce a wood-based resin foam molded article, and then a floor material was produced using the wood-based resin foam molded article.
First, polyethylene terephthalate having a melting point of 260 ° C. is selected as the core component of the core-sheath type non-woven fabric, and homopolypropylene having a melting point of 160 ° C. is selected as the sheath component, and a spunbond method by melt spinning using a concentric core-sheath type composite spinneret A long fiber nonwoven fabric was prepared.

  On the other hand, 100 parts by weight of a homopolypropylene resin obtained by adding 20% by weight of a maleic acid-modified homopolypropylene resin to a homopolypropylene resin as a thermoplastic resin, and wood as a wooden filler were broken by a cutter mill, and this was broken by a ball mill. A pulverized fine powder having an average 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 are added to 100 parts by weight of this wood-based resin composition, and the resulting mixture is put into an extruder 10 in an extruder H having the configuration shown in FIG. Extruded from the mold 11 at an extrusion speed of 1 m / min into a long shape having a rectangular shape with a cross section of a height of 2.5 mm × width of 295 mm and a height of 5 mm × width of 300 mm. The cross-sectional shape of the wall surface 14a is introduced into the sliding sizing mold 14 having a rectangular shape with a height of 5.2 mm and a width of 300 mm, and at the same time, the above-mentioned long-fiber nonwoven fabric is coated and adhered to the upper and lower surfaces, cooled, and taken to a length of 1800 mm Disconnected.
In this way, the woody resin foam molded article of the present invention could be produced satisfactorily without causing molding failure such as resin clogging in the sliding sizing mold 14 and deformation / breakage during take-up.

  On the other hand, 100 μm thick colored polypropylene sheets formed by blending pigments such as iron oxide and titanium oxide with random polypropylene were printed with urethane ink and homopolypropylene resin of 100 μm was formed by extrusion lamination. Embossing was simultaneously laminated with a thickness, a primer coat was applied to the back surface, and a top coat was applied to the front surface to prepare a decorative sheet made of polypropylene resin. Thereafter, the decorative sheet was continuously bonded to the surface of the wood-based resin foam molded article by a lapping process to prepare the flooring of the present invention.

<Comparative Example 1>
In Example 1 above, a non-woven fabric was used when a sliding resin sizing mold having a rectangular cross section of 5 mm in height and 300 mm in width was introduced into the sliding sizing mold 14 of a wood-based resin foam material. The flooring was prepared in the same manner as in Example 1 except that the coating adhesion was omitted.
Compared to Example 1, since the sliding sizing mold 14 was easily clogged under the same extrusion conditions, and stable foam molding was difficult, the extrusion speed of the wood-based resin foam material (that is, the take-up speed of the molded body) was increased. As a result of searching for conditions under which foaming and extrusion molding can be carried out satisfactorily without reducing molding, it has been found that molding cannot be carried out well unless the extrusion speed is reduced to 0.6 m / min.

<Performance comparison>
About the base material shape | molded in Example 1 and Comparative Example 1, the base-material dimension change at the time of changing environmental temperature from 0 degreeC to 60 degreeC was measured, and the linear expansion coefficient of a take-off direction and a base-material width direction was measured. did. The results are shown in Table 1.

  The linear expansion coefficient of the base material of Example 1 is improved in both the take-up direction and the width direction as compared with the base material of Comparative Example 1. In particular, with respect to the width direction, in the case of Comparative Example 1, the linear expansion coefficient in the width direction is a large value due to the orientation of the wood filler, but in the case of Example 1, the long fibers in the long fiber nonwoven fabric. Since these are also arranged in the width direction, it was confirmed that the linear expansion coefficient was more effectively suppressed.

FIG. 1 is an explanatory view showing the structure of the sliding sizing of the present invention. FIG. 2 is an explanatory view showing the structure of the cooling part of the sliding sizing of the present invention.

Explanation of symbols

10: Extruder,
10a ... Hopper,
11 ... extrusion mold,
12 ... Wooden resin foam material,
13 ... Nonwoven fabric,
14 ... Sliding sizing mold,
15 ... cooling water tank,
16 ... take-up machine,
17 ... cutting machine,
20 ... Torpedo,
H ... Extruder,
S: A wood-based resin foam molding.

Claims (3)

A wood-based resin foam material obtained by melting and foaming a wood-based resin composition containing at least a thermoplastic resin, a wood-based filler, and a foaming agent is extruded from a mold, and is passed through a sliding sizing mold and molded. A non-woven fabric made of the same type of thermoplastic resin as the thermoplastic resin is passed between the wood-based resin foam material and a sliding sizing mold, and the non-woven fabric is bonded to the surface of the wood-based resin foam material to make the wood-based resin. A method for producing a wood-based resin foam molded body integrally molded with a foam molded body,
The wood filler is mixed with the wood resin composition with a moisture content of 8% or less,
The non-woven fabric is a long-fiber non-woven fabric comprising a core-sheath composite long fiber having polyester as a core component, polyolefin as a sheath component, and a melting point of the core component being 40 ° C. or higher than the melting point of the sheath component. method for manufacturing textiles is of the woody woody resin foam-molded body characterized by being arranged at random in all directions of the resin foam molding body. A wood-based resin foam molded article manufactured by the method for producing a wood-based resin foam molded article according to claim 1 . A flooring comprising a decorative sheet laminated on the surface of the woody resin foam molded article according to claim 2 .

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