JP2017144616A - Method for manufacturing wood-like molded article and wood-like molded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a wood-like molded article having high strength, and to provide a wood-like molded article.SOLUTION: There is provided a method for manufacturing a wood-like molded article 1 formed by kneading and melting a mixed material containing cellulosic finely-divided particles J obtained from a wood material, a first thermoplastic resin K and a fiber composite material 118, and extruding or injection molding the molten material, where the fiber composite material 118 is formed by previously kneading a vegetable fiber M and a second thermoplastic resin N, crushing the fiber composite material 118, kneading and melting the cellulosic finely-divided particles J, the first thermoplastic resin K and the crushed fiber composite material 118 to be formed into a fused body 112, and extrusion molding or injection molding the fused body 112.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for producing a wood-like molded article and a wood-like molded article.

Conventionally, a technique for producing a wood-like molded product from cellulose fine particles and a resin is known (see, for example, Patent Document 1).
In this method, cellulose-based fine particles, a resin, a pigment, and the like are mixed, and the mixed material is molded into a woody molded product having a desired shape such as a plate shape or a rod shape by extrusion molding. As the cellulosic fine particles used as the raw material of the wood-like molded product, a recovered wooden member obtained by separating from the collected building material scrap or waste material is used.

JP 2001-328150 A

  However, in the method for producing a wood-like molded article and the wood-like molded article described in Patent Document 1, a pulverized powder obtained by pulverizing a cellulose material and a resin are mixed and melted to produce a wood-like molded article. However, a method for producing a wood-like molded product and a wood-like molded product, which are stronger than the wood-like molded product, have been required among consumers.

  The present invention has been made in view of the above problems, and an object thereof is to provide a method for manufacturing a wood-like molded product having high strength and a wood-like molded product.

  In order to solve the above-mentioned problem, for example, as shown in FIG. 1, the invention described in claim 1 is a cellulose-based fine particle J obtained from wood, a first thermoplastic resin K, a fiber composite material 118, and A wood-like molded product obtained by kneading, melting, and extruding or injection-molding a mixed material containing, wherein the fiber composite material 118 comprises a vegetable fiber M and a second thermoplastic resin N. The fiber composite material 118 is pulverized, the cellulosic fine powder J, the first thermoplastic resin K, and the pulverized fiber composite material 118 are kneaded and melted. Thus, the melt 112 is formed by extrusion molding or injection molding.

First, when cellulose-based fine particles J, vegetable fiber M, and first thermoplastic resin K are put into a kneading tank at once and kneaded and melted, that is, fiber composite material 118. In the case where the plant fiber M is not used, since the plant fiber M is kneaded with the first thermoplastic resin K in a state that is not familiar with the thermoplastic resin, the first thermoplastic resin K is infiltrated into the plant fiber M while being melted. Hard to do. Furthermore, since not only the plant fiber M and the first thermoplastic resin K but also the cellulose fine particles J are kneaded at the same time, the plant fiber M becomes more difficult to disperse.
For this reason, in the case where the fiber composite material 118 is not used, there is a situation in which the dispersion state is biased, causing problems such as poor formability and insufficient structural strength.
On the other hand, according to the invention described in claim 1, a mixed material containing cellulose-based fine particles J obtained from wood, the first thermoplastic resin K, and the fiber composite material 118 is kneaded. A method for producing a wood-like molded product obtained by melting and extrusion or injection molding, wherein the fiber composite material 118 is obtained by kneading the plant fiber M and the second thermoplastic resin N in advance. The material 118 is pulverized, and the cellulosic fine particles J, the first thermoplastic resin K, and the pulverized fiber composite material 118 are kneaded and melted to obtain a melt 112.
At this time, the vegetable fiber M is kneaded with the second thermoplastic resin N in advance as the fiber composite material 118 and is in a state in which the vegetable fiber M is familiar with the second thermoplastic resin. In addition, since the second thermoplastic resin N and the first thermoplastic resin K are mixed while being melted, the plant fiber M becomes familiar with the first thermoplastic resin K in order to knead. For this reason, the dispersion state of the vegetable fiber M in the melt 112 becomes favorable.
And since the melt 112 in a good dispersion state is extrusion-molded or injection-molded, the cellulose fine particles J, the first thermoplastic resin K, and the second thermoplastic resin N are uniformly entangled with the plant fiber M, and the woody appearance The strength of the molded product can be improved.
Further, in the woody molded article to be produced, the vegetable fiber M is blended so that the vegetable fiber M is entangled with the thermoplastic resin and the cellulose fine particles J to form a chain-like or bone-like skeleton structure. Therefore, the strength can be increased as compared with a wood-like molded product obtained by kneading and melting only the cellulose-based fine particles J and the first thermoplastic resin K.

  The invention according to claim 2 is, for example, as shown in FIG. 1, cellulose-based fine particles J obtained from a wood waste material containing impurities, and a first thermoplastic resin waste material K obtained from a thermoplastic resin waste material containing impurities. And a fiber composite material 118, a method of manufacturing a wood-like molded product obtained by kneading and melting a mixed material, extruding or injection molding, The second thermoplastic resin N is kneaded in advance, the fiber composite material 118 is pulverized, the cellulose fine particles J, the first thermoplastic resin waste material K, and the pulverized fiber composite material 118 are pulverized. These are kneaded and melted to form a melt 112, and the melt 112 is extrusion-molded or injection-molded.

As described above, cellulose fine particles J, vegetable fibers M, first thermoplastic resin K, and second thermoplastic resin N are put into a kneading tank at a time and kneaded and melted. In this case, that is, when the fiber composite material 118 is not used, the first thermoplastic resin K is melted because the plant fiber M is kneaded with the first thermoplastic resin K in a state that is not familiar with the thermoplastic resin. However, it hardly infiltrates the plant fiber M. Furthermore, since not only the plant fiber M and the first thermoplastic resin K but also the cellulose fine particles J are kneaded at the same time, the plant fiber M becomes more difficult to disperse.
For this reason, in the case where the fiber composite material 118 is not used, there is a situation in which the dispersion state is biased, causing problems such as poor formability and insufficient structural strength.
On the other hand, according to the invention described in claim 2, cellulosic fine particles J obtained from the wood waste containing impurities, the first thermoplastic resin waste K obtained from the thermoplastic resin waste containing impurities, The composite material 118 is a method for producing a wood-like molded product obtained by kneading and melting a mixed material containing the fiber composite material 118, and extruding or injection molding the fiber composite material 118. A plastic resin N is kneaded in advance, the fiber composite material 118 is pulverized, and the cellulose fine particles J, the first thermoplastic resin waste material K, and the pulverized fiber composite material 118 are kneaded. It melts to make a melt 112.
At this time, the vegetable fiber M is kneaded with the second thermoplastic resin N in advance as the fiber composite material 118 and is in a state in which the vegetable fiber M is familiar with the second thermoplastic resin. In addition, since the second thermoplastic resin N and the first thermoplastic resin K are mixed while being melted, the plant fiber M becomes familiar with the first thermoplastic resin K in order to knead. For this reason, the dispersion state of the vegetable fiber M in the melt 112 becomes favorable.
Then, since the melt 112 in a good dispersion state is extruded or injection-molded, a cellulose-based fine particle J is obtained by pulverizing the fiber composite material 118 previously kneaded with the vegetable fiber M and the second thermoplastic resin N. And the first thermoplastic resin K can be put into a kneading tank and kneaded and melted, so that the dispersion state in the kneading of the vegetable fibers M can be eliminated. For this reason, the cellulose-based fine particle J, the 1st thermoplastic resin K, and the 2nd thermoplastic resin N are entangled with the vegetable fiber M, and the intensity | strength of a wood-like molded product can be improved uniformly.
Further, in the woody molded article to be produced, the vegetable fiber M is blended so that the vegetable fiber M is entangled with the thermoplastic resin and the cellulose fine particles J to form a chain-like or bone-like skeleton structure. Therefore, the strength can be increased as compared with a wood-like molded product obtained by kneading and melting only the cellulose-based fine particles J and the first thermoplastic resin K.
Furthermore, since the wood-like molded product is produced using the wood waste material containing impurities and the first thermoplastic resin waste material K containing impurities, the waste materials can be reused beneficially, and the production cost can be reduced. It can also contribute to global environmental protection.

  For example, as shown in FIG. 1, the invention according to claim 3 is a method for producing a wood-like molded article according to claim 1 or 2, wherein the fiber composite material 118 is crushed into flakes and then kneaded. It is characterized by doing.

According to the third aspect of the invention, since the fiber composite material 118 is pulverized into flakes and then kneaded, for example, the fiber composite material 118 is compared with a case where the fiber composite material 118 is pulverized into powder. The fiber length dimension of the vegetable fiber M contained in can be ensured long.
For this reason, the strength of the wood-like molded product is increased by the entanglement of the cellulose-based fine particles J, the first thermoplastic resin K, and the second thermoplastic resin N with the plant fiber M contained in the produced wood-like molded product. It can be improved further.

  For example, as shown in FIG. 1, the invention according to claim 4 is the method for producing a wood-like molded article according to any one of claims 1 to 3, wherein the diameter of the fiber composite material 118 is from 5 mm. It is characterized by crushing to a size of up to 20 mm.

  According to the invention described in claim 4, since the diameter of the fiber composite material 118 is pulverized to a size of 5 mm to 20 mm, the fiber length dimension is short as in the case where the diameter of the fiber composite material 118 is 5 mm or less. There is no fear that sufficient strength cannot be improved, and the fiber length dimension is too long as in the case where the diameter of the fiber composite material 118 is 20 mm or more, which adversely affects the moldability of the wood-like molded product in the molding stage. There is no fear. That is, since the fiber composite material 118 is pulverized so that the diameter falls within the range of 5 mm to 20 mm, a wood-like molded product having sufficient strength and good moldability can be manufactured.

  The invention according to claim 5 is, for example, as shown in FIG. 1, in the method for producing a wood-like molded article according to any one of claims 1 to 4, kenaf fibers M are used as the plant fibers M. It is characterized by using.

According to the invention described in claim 5, kenaf fiber M is used as plant fiber M. Here, kenaf is an annual herbaceous plant, that is, a plant that can be cultivated throughout the year, and grows until it can be harvested in 4 to 5 months. Kenaf has a higher fiber yield per unit area than other annual herbaceous plants.
For this reason, the vegetable fiber M can be received stably, and since it can be mass-produced, it is inexpensive and the manufacturing cost can also be reduced.
Kenaf is a plant that has a high carbon dioxide absorption rate and a high environmental purification capacity that absorbs nitrogen and phosphorus in the soil and water, and cultivating and using such plants also protects the global environment. Can contribute.

  The invention according to claim 6 is a wood-like molded article, for example, as shown in FIG. 1, cellulosic fine particles J obtained from wood, a first thermoplastic resin K, vegetable fibers M and And a fiber composite material 118 containing two thermoplastic resins N.

  According to the invention described in claim 6, from the cellulose-based fine particles J obtained from wood, the first thermoplastic resin K, the fiber composite material 118 including the vegetable fiber M and the second thermoplastic resin N. Therefore, since the plant fiber M is blended, it is possible to increase the strength as compared with the wood-like molded product obtained by kneading and molding only the cellulose-based fine particles J and the first thermoplastic resin K. it can.

  The invention according to claim 7 is a wood-like molded article, for example, as shown in FIG. 1, obtained from cellulose-based fine particles J obtained from a wood waste material containing impurities and a thermoplastic resin waste material containing impurities. It consists of the 1st thermoplastic resin waste material K and the fiber composite material 118 containing the vegetable fiber M and the 2nd thermoplastic resin N, It is characterized by the above-mentioned.

According to invention of Claim 7, the cellulose type fine particle J obtained from the wood waste material containing an impurity, the 1st thermoplastic resin waste material K obtained from the thermoplastic resin waste material containing an impurity, and vegetable fiber M, Since it consists of the fiber composite material 118 containing the 2nd thermoplastic resin N, since the vegetable fiber M is mix | blended, it knead | mixes and melts only the cellulose fine particle J and the 1st thermoplastic resin K, and melt | dissolves. The strength can be increased compared to the molded wood-like molded product.
Moreover, since the wood-like molded product is produced using the wood waste material containing impurities and the first thermoplastic resin waste material K containing impurities, the waste materials can be reused beneficially, and the production cost can be reduced. It can also contribute to global environmental protection.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of a wood-like molded article with high intensity | strength and a wood-like molded article can be provided.

It is a perspective view of the wooden-like molded product which concerns on embodiment of this invention. It is a conceptual diagram which shows the manufacturing process of the wood-like molded article which concerns on embodiment of this invention. It is a schematic block diagram which shows the extrusion molding machine in the manufacturing apparatus of the wood-like molded product which concerns on embodiment of this invention. It is a figure which shows the result of the bending strength and Young's modulus of the wood-like molded product which concerns on Example 3 of this invention. It is a figure which shows the result of the Charpy value of the wood-like molded product which concerns on Example 3 of this invention. It is a figure which shows the result of the bending strength and Young's modulus of the wood-like molded product which concerns on Example 4 of this invention. It is a figure which shows the result of the Charpy value of the wood-like molded product which concerns on Example 4 of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. However, the embodiments described below are provided with various technically preferable limitations for carrying out the present invention. However, the technical scope of the present invention is not limited to the following embodiments and illustrated examples. Absent.

  The wood-like molded product 1 is, for example, as shown in FIG. 1, a cellulose-based fine particle J obtained from a wood waste material containing impurities, a first thermoplastic resin waste material K obtained from a thermoplastic resin waste material containing impurities, It consists of the fiber composite material 118 containing the vegetable fiber M and the 2nd thermoplastic resin N.

A method for producing the wood-like molded product 1 will be described with reference to FIG. The wood-like molded product 1 includes an extrusion molding machine 30, a sizer 40, a grinding device 102, an eddy current sorting machine 103a, a strong magnet, a specific gravity sorting machine 103b, a grinding device 104, a grinding device 106, a mixing mixer 108, and an inorganic pigment. Manufactured by a manufacturing apparatus including an input unit 109, a crushing device 116, a cutting device 117, a coating device, and the like.
First, a building member used as a building frame or the like is separately collected into a recovered wooden member made of wood, that is, a wooden waste material, and a recovered resin member made of resin, that is, a resin waste material, when the building is rebuilt. Of course, the building material to be collected includes not only demolition waste from an old building but also waste material generated at a new construction site. In addition, as this sorting work, sorting work by human power, mechanical sorting using the difference in physical properties of each material, or the like is used.
In addition, at the stage where the sorting operation is completed, the building member is formed into a massively divided lump in the work of removing the building member, the disassembling operation, or the like.

Then, the wood waste material and the resin waste material are pulverized, but before pulverizing them, the weights of the members constituting the respective waste materials are measured. For example, first, the recovered wooden waste material and resin waste material are respectively stored in input containers that can be input to the crushing apparatuses 102 and 116, respectively. The charging container may be provided in each of the crushing apparatuses 102 and 116.
For example, as an example of the wood waste material, there is a wood panel used in the panel method. The wood panel is attached to at least one of the frame and the front and back surfaces of the frame, which are constructed by assembling vertical and horizontal frame materials in a rectangular frame shape and providing auxiliary bars in the rectangular frame. And face materials such as plywood.

Then, the weight of each waste material put in each input container and the weight of impurities in each waste material are examined.
The weight of impurities contained in each waste material and the weight of each waste material can be determined by confirming the weight of each constituent member constituting each waste material in advance.
That is, the total weight in the case of wood waste is the total weight of each component constituting the wood waste, and the weight of impurities in the wood waste is the total weight of the members excluding the wood member among the components. Become.
For example, if the wooden waste containing impurities is a wall body made of wall panels, the weight of the impurities is the total weight of the wooden waste containing impurities minus the weight of the wooden part (wood panel) The total weight of the wood waste material is the total weight of impurities such as gypsum board and heat insulation material plus the weight of the wood panel.

Similarly, the resin waste material put into the charging container can be determined by checking in advance the total weight and the weight of the resin waste material that is not a resin product.
In addition, in the state of the resin product before the resin waste material, if the ratio and weight of the constituent members are known in advance, the weight of the resin portion and the weight of the impurities can be determined by using this.

  Then, as shown in the conceptual diagram of the production apparatus in FIG. 2, a considerably divided lump, for example, a wood waste material having a size of about 4 to 5 centimeters is pulverized to a size of several millimeters (primary pulverization step A).

The pulverizing apparatus 102 used in the primary pulverizing step A has a pulverizing function capable of forming a lump having a lump size of several millimeters, and specifically includes two pieces. This is a pulverizing apparatus 102 that forms a large number of protrusions on the surfaces of the opposing rollers and rotates the rollers while applying pressure between the rollers, thereby crushing what passes between them. Of course, the crusher 102 is not limited to this, and other crushers for coarse crushing may be used as long as they have the same function.
For example, a jaw crusher that pulverizes the raw material by putting the raw material between a jaw open to the upward V shape and a vibrating jaw and pressurizing it, or a gyre that the movable crushing surface swirls in the fixed crushing surface and crushes continuously Other coarse crushing devices such as a rent crusher may be used.

Thereafter, the metal that adheres to the crushed wood waste material with a strong magnet is selected, and further, the metal that is conductive but not attached to the magnet is selected with an eddy current selector 103a.
Further, the metals, stones, and the like remaining in the magnetic sorting are sorted by the specific gravity sorter 103b (sorting step B).
Here, the ratio of the total weight of both impurities to the total weight of the wood waste and resin waste mixed later is set to 20 wt% or less.
That is, the weight of the impurities in the resin waste is summed to a weight obtained by further subtracting the weight of the metal or stone sorted by the eddy current sorter 103a and the specific gravity sorter 103b from the total weight of the impurities in the wood waste obtained previously, The ratio of the total weight is adjusted to 20 wt% or less of the whole. It is assumed that the total weight at this time is obtained by further subtracting the weight of metal or stone sorted by the eddy current sorter 103a and the specific gravity sorter 103b.
For example, if the wood waste is a wall panel, the impurities are gypsum and heat insulating material, and the total weight of these gypsum and heat insulating material and impurities contained in the resin waste material such as calcium carbonate, talc, pigment, PE, FRP, etc. However, it adjusts so that it may become 20 wt% or less of the total weight of a wall panel and a resin waste material. At this time, when the resin is contained in the wood waste material, the weight of the resin is excluded from the weights of both impurities. Further, when the resin waste material contains a woody part such as wood powder, its weight is excluded from the weight as an impurity.

  Next, in the secondary pulverization step C, the primary pulverized material that has finished the primary pulverization step A is pulverized into a fine powder. The pulverizer 104 used in the secondary pulverization step C is capable of pulverizing a lump into a fine powder to about 1 millimeter. Specifically, it is a hammer chip that rotates at high speed. A hammer mill is used that crushes the material and repeats the crushing action until it passes through a round hole in the screen on the outer periphery of the hammer tip. Of course, the crushing device 104 to be used is not limited to the above-described hammer mill, and any other crushing device may be used as long as it has a similar function. For example, you may use the cutter mill shredded with a cutter, the roll mill crushing with a roller, etc.

Next, in the tertiary pulverization step D, the secondary pulverized material that has been subjected to the secondary pulverization step C is pulverized into a fine powder to obtain a wood waste material pulverized powder J as cellulose-based fine particles. The pulverizer 106 used in the tertiary pulverization step D can pulverize the material obtained in the secondary pulverization step C into a finer powder.
Specifically, it is a so-called pin mill, which can be pulverized by receiving impact and repulsion interaction with a pin attached to a disk. More specifically, this pin mill includes a disk-shaped rotating disk having a large number of pins in the vertical direction and a fixed disk having a large number of pins on a surface facing the rotating disk, and is obtained by the secondary crushing step C. When the material is thrown into the center of the rotating disk, it can enter the gap between the rotating disk and the pin attached to the fixed disk by centrifugal force, and can be pulverized into fine powder under the impact and repulsive interaction of the pin Is. In the tertiary pulverization step D, the particles are pulverized into particles having a size of about 500 micrometers by the pin mill described above. Of course, the crushing device 106 is not limited to the above-described pin mill, and may be another fine crushing device having a similar function, such as a ball mill or a stone mill.
In the pulverization processes A, C, and D as described above, the recovered wooden waste material 101 is divided into three stages, and the pulverization is efficiently performed step by step.

The wood waste material pulverized powder J subjected to the pulverization steps A, C, and D in this way is selected to have an average particle size of 300 μm with a mesh of 500 μm. That is, the wood waste material pulverized powder J is passed through the sieve 107, and those having a size of 500 micrometers or more are returned to the pulverizer 106 and re-ground.
Then, the wood waste material pulverized powder J having an average particle size of 300 μm and an inorganic pigment of several μm are weighed in an appropriate amount by a load cell type automatic meter, and mixed in the mixing mixer 108 heated in advance by an oil temperature controller. , Heated by self-heating (friction heat) and stirred at 175 ° C.
At this time, the inorganic pigment is applied around the wood powder (woody portion) of the wood waste material pulverized powder J by feeding the inorganic pigment into the mixing mixer 108 from the inorganic pigment feeding unit 109.

Next, the fiber composite material is obtained by kneading plant fiber and the second thermoplastic resin in advance. As the vegetable fiber and the second thermoplastic resin, for example, kenaf fiber M and polypropylene resin N described in JP-A-2009-234129 are used.
As the polypropylene resin N, non-acid-modified polypropylene resin, acid-modified polypropylene resin, or the like is used.
In this embodiment, a kenaf board 118 (manufactured by Toyota Boshoku Co., Ltd.) used for automobile interior parts is used as a fiber composite material.
The kenaf board 118 melts and spins polypropylene resin N, blends with kenaf fiber M, heats the blended fiber mixture to melt polypropylene resin N, and at the same time compresses it into a desired shape. Is obtained.
The kenaf board 118 is coarsely pulverized using a pulverizer 119 such as a hammer mill to obtain flake-like vegetable fiber flakes L. This is passed through a sieve having a predetermined diameter and arbitrarily classified in the range of 5 mm to 20 mm in diameter. By classifying in this way, the kenaf fibers M can be distributed over a certain length of unity.

On the other hand, the resin waste material 110 is coarsely pulverized using a pulverizer 116 such as a hammer mill to obtain a resin waste material pulverized powder K as the first thermoplastic resin waste material.
The obtained resin waste material pulverized powder K is put into a mixing mixer 108 in which the wood waste material pulverized powder J, the vegetable fiber flakes L, and the inorganic pigment are mixed, and further stirred at 185 ° C. In the stirring, the mixed material 112 is obtained as a melt by kneading at a low speed after high-speed rotation.
Here, a phenomenon that occurs when kneading will be described. First, at the stage where stirring is started, first, the polypropylene resin N of the vegetable fiber flakes L starts to melt. That is, the melting point of the polypropylene resin is lower than that of the resin waste material pulverized powder K. For this reason, the polypropylene-based resin N previously melted is mixed with the resin waste material pulverized powder K and the wood waste material pulverized powder J together with the kenaf fiber M, and the resin waste material pulverized powder K is gradually melted. The kenaf fibers M that are dispersed so as to be guided by the resin N are dispersed as a whole so that they are also guided by the molten resin waste material. For this reason, the mixed material 112 in which the kenaf fibers M are uniformly dispersed is obtained.

The mixed material 112 is transferred to the cooler mixer 113 and cooled with stirring. As a result, the thermoplastic resin melted at a high temperature increases in viscosity with a decrease in temperature, and thus granulation occurs. Further, the particle diameter of the granulated product granulated with a decrease in temperature increases.
In the cooler mixer 113, stirring and cooling are performed until a granulated product having a particle size larger than that of the granulated product having a desired particle size is obtained.
Next, the obtained granulated product is transferred to the cooler pulverizer 114 and further pulverized while being cooled. Thereby, the particle size of a granulated material is made small and the granulated material of a desired particle size is obtained (kneading process E).
In the kneading step E, a bond strengthening agent or the like may be added. Examples of the bond reinforcing agent include maleic anhydride-modified polypropylene resin.

  Each composition of the wood waste material pulverized powder J, the resin waste material pulverized powder K, and the vegetable fiber flake L in the kneading process E is 10 to 58 wt% of the wood waste material pulverized powder J, 5 to 77 wt% of the resin waste material pulverized powder K, and the plant. The functional fiber flakes L are blended in the range of 5 to 48 wt%.

Next, the mixed material 112 is put into the extrusion molding machine 30 and filled in the die 34 with the screw 32 to perform extrusion molding (molding process F).
As the extrusion molding machine 30, for example, a bend type extrusion molding machine is used. As shown in FIG. 3, this extrusion molding machine 30 is provided with a hollow prismatic cylinder 31, a screw 32 provided therein, and a rear end portion of the hollow prismatic cylinder 31, and is supplied with a mixed material. And a die 34 that is provided at the tip of the cylinder 31 and imparts a desired shape to the mixed material 112.
As shown in FIG. 3, the mixed material 112 supplied to the hopper 33 is charged into the cylinder 31, where it is pushed forward by the screw 32 while being heated and melted, and further pushed out from the die 34, to have a desired shape, Here, an extrusion molded product 115 formed into a hollow prism shape is manufactured.
That is, the die 34 is a die for pipes and tubes, and is a molding having a core for molding the inner diameter of the hollow prismatic main body 2 in order to mold the extruded product to be molded, that is, the hollow prismatic main body 2. The mixed material 112 is filled into the molding part and extruded to be molded into a desired shape, here, a long hollow prism-shaped extruded product 115.
The molding temperature is set to 180 to 220 ° C., and molding is performed at this molding temperature. Here, the molding temperature was set to 180 to 220 ° C. The resin was not sufficiently softened at less than 180 ° C., and the wood waste material pulverized powder J and the kenaf fiber M were difficult to be evenly kneaded. This is because the pulverized powder J causes changes such as carbonization by heat.

Next, the extruded product 115 extruded into a hollow prism shape from the die 34 is cooled by a cooling device, here, a water tank 35 containing water, and the shape of the cooled extruded product 115 is adjusted by the sizer portion 40. (Sizer process).
The sizer portion 40 includes an extrusion 41 to be molded, that is, an opening 41 having an inner diameter substantially the same as the outer diameter of the hollow prismatic main body 2, and the extrusion 115 is inserted into the opening 41. Then, the shape and dimensions of the cross section of the extruded product 115 are adjusted. That is, the extruded product 115 becomes a hollow prism having a desired size and shape while being cooled.
The extruded product 115 is the hollow prismatic main body 2 and is substantially the same. That is, as will be described later, the hollow prismatic main body 2 is formed by cutting the extruded product 115 by a predetermined length. Here, the sizer unit 40 is provided in the water tank, but is not limited thereto, and is provided at a predetermined interval at the discharge port of the die 34 or between the die 34 and the water tank 35, for example, at the entrance of the water tank 35. For example, the extruded product 115 extruded from the die 34 may be once cooled by outside air, inserted through the sizer portion 40, and then cooled in a water tank or the like.

  Next, the surface of the extruded product 115 formed as described above is subjected to sanding (surface treatment step G). That is, the surface of the surface layer portion of the extruded product 115 is roughened with sanding paper to form a large number of streak patterns.

  Subsequently, in the cutting process H, the extruded product 115 is cut at a predetermined length by the cutting device 117 in accordance with the movement of the extruded product 115 on a roller conveyor (not shown). The cutting device 117 includes a roller conveyor (not shown), a cutter unit (not shown), a cutter moving unit (not shown) that moves the cutter unit in synchronization with the extrusion speed of the extruded product 115, and the like. The extruded product 115 can be cut at a predetermined length while matching the movement of the extruded product on the roller conveyor.

The hollow prismatic main body 2 of the wood-like molded product 1 using the wood waste material and the resin waste material collected through such work steps can be obtained.
In addition, the use of wood waste and resin waste is also excellent from the viewpoint of effective use of resources and environmental protection.
The surface of the hollow prismatic main body 2, that is, the outer peripheral surface is roughened by sanding treatment, so that the surface can appear fuzzy and has a texture closer to that of natural wood, improving the appearance quality. Can be achieved.

First of all, when wood waste material pulverized powder J, kenaf fiber M, resin waste material pulverized powder K, and polypropylene resin N are put into a kneading tank at once and kneaded and melted, that is, kenaf. In the case where the board 118 is not used, the kenaf fiber M is kneaded with the resin waste material pulverized powder K in a state that is not familiar with the thermoplastic resin, so that the resin waste material pulverized powder K is not easily infiltrated into the kenaf fiber M while melting. . Furthermore, since not only the kenaf fiber M and the resin waste material pulverized powder K but also the wooden waste material pulverized powder J are kneaded at the same time, the kenaf fiber M becomes more difficult to disperse.
For this reason, when the kenaf board 118 is not used, there is a situation in which the dispersion state is biased, causing problems such as poor moldability and insufficient structural strength.
On the other hand, in this embodiment, for example, as shown in FIG. 2, the wood waste material pulverized powder J obtained from the wood waste material containing impurities, and the resin waste material pulverized powder K obtained from the thermoplastic resin waste materials containing impurities, A method for producing a wood-like molded product obtained by kneading and melting a mixed material containing plant fiber flakes L and extruding or injection molding the kenaf board 118, the kenaf fiber M and the polypropylene resin N And kneaded the kenaf board 118, kneaded the wood waste material pulverized powder J, the resin waste material pulverized powder K, and the plant fiber flake L pulverized kenaf board 118 and melted Thus, the mixed material 112 was obtained, and the mixed material 112 was subjected to extrusion molding or injection molding.
By doing so, the kenaf fiber M is kneaded with the polypropylene resin N in advance as the kenaf board 118 and is in a state of being familiar with the polypropylene resin N, and the resin waste material pulverized powder K is added thereto and kneaded. For this reason, the kenaf fiber M becomes compatible with the resin waste material pulverized powder K in the process in which the polypropylene resin N and the resin waste material pulverized powder K are mixed while melting. For this reason, the dispersion state of the kenaf fiber M in the melt 112 becomes favorable.
Since the melt 112 in a well dispersed state is extrusion molded or injection molded, the kenaf board 118 obtained by previously kneading the kenaf fiber M and the polypropylene resin N is crushed from the wood waste material pulverized powder J and the resin waste material pulverized. Since it can be poured into the kneading tank together with the powder K and kneaded and melted, the dispersion state in the kneading of the kenaf fibers M can be eliminated. For this reason, the wood waste material pulverized powder J, the resin waste material pulverized powder K, and the polypropylene resin N are entangled with the kenaf fiber M, and the strength of the wood-like molded product 1 can be improved uniformly.
Moreover, since the wood-like molded article 1 to be manufactured is blended with the kenaf fiber M, the kenaf fiber M is entangled with the thermoplastic resin and the wood waste material pulverized powder J to form a chain-like or bone-like skeleton structure. The strength can be increased as compared with the wood-like molded product 1 formed by kneading and melting only the wood waste material pulverized powder J and the resin waste material crushed powder K.
Furthermore, since the wood-like molded product 1 is produced using the wood waste material containing impurities and the resin waste material pulverized powder K containing impurities, the waste materials can be reused beneficially, and the production cost can be reduced. It can also contribute to environmental protection.

In the present embodiment, for example, as shown in FIG. 2, the kenaf board 118 is crushed into flakes and then kneaded.
By carrying out like this, compared with the case where the vegetable fiber flakes L are grind | pulverized to a powder form, the fiber length dimension of the kenaf fiber M contained in the vegetable fiber flakes L can be ensured long, for example.
For this reason, the strength of the wood-like molded product is further improved by entanglement of the wood waste material pulverized powder J, the resin waste material pulverized powder K and the polypropylene resin N with the kenaf fibers M contained in the produced wood-like molded product. Can do.

Moreover, in this embodiment, as shown in FIG. 2, the diameter of the vegetable fiber flake L shall be grind | pulverized to the magnitude | size from 5 mm to 20 mm.
By doing so, there is no fear that the fiber length dimension is short and sufficient strength cannot be improved as in the case where the diameter of the plant fiber flakes L is 5 mm or less, and the diameter of the plant fiber flakes L is 20 mm or more. In this case, there is no possibility that the fiber length dimension is too long and the moldability of the wood-like molded product is adversely affected in the molding stage.
That is, since it grind | pulverizes so that the diameter of the vegetable fiber flake L may be settled in the range from 5 mm to 20 mm, the wood-like molded article which has sufficient intensity | strength and favorable moldability can be manufactured.

In the present embodiment, for example, kenaf fibers M are used as shown in FIG. Here, kenaf is an annual herbaceous plant, that is, a plant that can be cultivated throughout the year, and grows until it can be harvested in 4 to 5 months. Kenaf has a higher fiber yield per unit area than other annual herbaceous plants.
For this reason, the kenaf fiber M can be stably received, and mass production is possible, so that the cost is low and the manufacturing cost can be reduced.
Kenaf is a plant that has a high carbon dioxide absorption rate and a high environmental purification capacity that absorbs nitrogen and phosphorus in the soil and water, and cultivating and using such plants also protects the global environment. Can contribute.

In the present embodiment, for example, as shown in FIG. 2, vegetable fiber flakes L including wood waste material pulverized powder J obtained from wood, resin waste material pulverized powder K, kenaf fiber M, and polypropylene resin N are included. And consisted of
In this way, since the kenaf fiber M is blended, it is possible to increase the strength as compared with a wood-like molded product obtained by kneading and melting only the wood waste material pulverized powder J and the resin waste material pulverized powder K. it can.

Further, in the present embodiment, for example, as shown in FIG. 2, the wood waste material pulverized powder J obtained from the wood waste material containing impurities, the resin waste material pulverized powder K obtained from the thermoplastic resin waste materials containing impurities, and kenaf fibers It consisted of the vegetable fiber flakes L containing M and the polypropylene resin N.
In this way, since the kenaf fiber M is blended, it is possible to increase the strength as compared with a wood-like molded product obtained by kneading and melting only the wood waste material pulverized powder J and the resin waste material pulverized powder K. it can.
In addition, because wood-like molded products are produced using the waste wood containing impurities and the resin waste pulverized powder K containing impurities, the waste can be reused beneficially and the production cost can be reduced. It can also contribute to protection.

As mentioned above, although this invention was concretely demonstrated based on this embodiment, this invention is not limited to the said embodiment, It can change in the range which does not deviate from the summary.
In the present embodiment, as a method for producing a wood-like molded product, all raw materials are melted and kneaded to produce a single granulated product, which is extrusion molded, so-called single layer molding, but is not limited thereto. Absent.
For example, the first granulated product is produced by melting and kneading the raw material that becomes the base of the wood-like molded product, and independently of this, the raw material that becomes the surface layer part of the wooden-like molded product is melted and kneaded. Thus, the second granulated product may be manufactured. And a base | substrate is shape | molded using a 1st granulated material, and a surface layer is shape | molded using the 2nd granulated material on the surface of this base | substrate. As a result, the wood-like molded product has a two-layer structure including a substrate inside and a surface layer outside.

In such so-called two-layer molding, a raw material for the second granulated product is added with a pigment that gives color to the wood-like molded product, a weathering agent to prevent surface deterioration, and a fungicide that suppresses mold generation. May be. Moreover, these additives exhibit an effect in the surface layer of the woody molded article 1 and do not necessarily need to be contained in the substrate.
By doing this, the manufacturing cost by the two-layer molding in which the additive is contained only in the surface layer is reduced compared to the manufacturing by the single-layer molding in which the additive is contained in all the wood-like molded products. Can do.
Further, in the raw material of the wood-like molded article 1, these additives are relatively expensive, and the required amount of expensive additives can be reduced, so that the manufacturing cost of the wood-like molded article 1 is dramatically increased. It can be made cheap.

In addition, the arrangement of the wood-like molded product 1 can be easily performed by changing the specifications of the second granulated product to be the surface layer part (particularly additives relating to appearance and surface characteristics such as pigment). Accordingly, for example, it is possible to change the specifications of the surface layer portion according to the customer's request (for example, color and surface properties) with the base of the wood-like molded product 1 as a common specification.
For example, by reducing the content of the wood waste material pulverized powder J on the surface layer and increasing the content of the resin waste material pulverized powder K, it is possible to reduce the water absorption of the surface of the wood-like molded product. In this case, since a large amount of resin material is present on the surface, it becomes easy to be charged, so it is preferable to add an antistatic agent to the second granulated product.

In the present embodiment, the wood waste material pulverized powder J is used as it is in the kneading step E, but the present invention is not limited thereto. For example, the wood waste material pulverized powder J may be acetylated before being used in the kneading step E.
By doing so, the hydroxyl group at the end of cellulose, which is the raw material of the wood flour, is converted to an acetyl group, that is, changed from a hydrophilic group to a hydrophobic group, thereby inhibiting water adsorption.
For this reason, the wood-like molded product 1 with a low water absorption rate can be manufactured. As a result, it is possible to prevent dimensional changes over a long period due to water absorption or moisture absorption, deformation and cracking due to uneven water absorption conditions, and the like.
Moreover, since the adsorption of water can be inhibited by the acetylation treatment of the wood waste material pulverized powder J, the familiarity between the wood powder and the resin is improved, and the strength can be improved.

Further, in the present embodiment, for example, as shown in FIG. 2, wood waste material pulverized powder J as cellulose-based fine particles and resin waste material pulverized powder K as the first thermoplastic resin are used as raw materials of the wood-like molded product 1. It is not limited to using such waste materials. For example, the wood-like molded product 1 may be manufactured using wood pulverized powder and resin pulverized powder that are not waste materials.
By using this, the plant fiber flakes L are used, in which wood pulverized powder, kenaf fiber M, resin pulverized powder, and polypropylene resin N are poured into a kneading tank at once and kneaded and melted. Compared to the case where there is not, the pulverized plant fiber flakes L previously kneaded with kenaf fiber M and polypropylene resin N are put into the kneading tank together with the wood pulverized powder and the resin pulverized powder and kneaded. Therefore, the dispersion state in the kneading of the kenaf fiber M can be eliminated. For this reason, the wood pulverized powder, the resin pulverized powder, and the polypropylene resin N are uniformly entangled with the kenaf fiber M, and the strength of the wood-like molded product 1 can be improved.
Moreover, since the wood-like molded product 1 to be manufactured contains the kenaf fiber M, the strength is higher than that of the wood-like molded product 1 formed by kneading and melting only the wood pulverized powder and the resin pulverized powder. Can be high.

  Further, in the present embodiment, for example, as shown in FIG. 2, wood waste material pulverized powder J as cellulose-based fine particles and resin waste material pulverized powder K as the first thermoplastic resin are used as raw materials of the wood-like molded product 1. It is not limited to using such waste materials. For example, a wood-like molded product 1 using a wood pulverized powder and a resin pulverized powder that are not waste materials may be used.

[Example 1]
In Example 1, as the plant fiber flake L, a kenaf board 118 (manufactured by Toyota Boshoku Co., Ltd.) formed by mixing non-acid-modified thermoplastic resin and kenaf fiber was used (Japanese Patent Laid-Open No. 2009-234129). See the official gazette).
As the non-acid-modified thermoplastic resin, non-acid-modified polypropylene resin (trade name “Novatech SA01”, manufactured by Nippon Polypro Co., Ltd.) was used.
The blending composition is vegetable fiber flake L39 wt%, wood waste material pulverized powder J29 wt%, and resin waste material powder 19 wt%.
Bending strength and Young's modulus were measured for a wood-like molded article 1 (cross-sectional dimension of the test piece used for the strength test was 145 × 30 mm) obtained by the two-layer molding in this composition.

[Example 2]
In Example 2, as the plant fiber flake L, a kenaf board 118 (manufactured by Toyota Boshoku Co., Ltd.) formed by mixing an acid-modified thermoplastic resin and kenaf fiber was used.
As the acid-modified thermoplastic resin, an acid-modified polypropylene resin (weight average molecular weight 40,000, 60 ° C. melt viscosity 16,000, oxidation 26, manufactured by Sanyo Chemical Industries, Ltd.) was used.
The blending composition is plant fiber flake L 38 wt%, wood waste material pulverized powder J 29 wt%, and resin waste material pulverized 19 wt%.
Bending strength and Young's modulus were measured for a wood-like molded article 1 (cross-sectional dimension of the test piece used for the strength test was 145 × 30 mm) obtained by the two-layer molding in this composition.

[Comparative Example 1]
In Comparative Example 1, a molded product was manufactured using only the wood waste material pulverized powder J and the resin waste material pulverized powder K.
The blending composition is wood waste material pulverized powder 50 wt% and resin waste material pulverized powder K 41 wt%.
The bending strength and Young's modulus of the molded product obtained by single layer molding in this composition (the cross-sectional dimension of the test piece used for the strength test is 60 × 30 mm) was measured.

[Comparative Example 2]
In Comparative Example 2, a molded product was produced using kenaf fiber M, wood waste material pulverized powder J, and resin waste material pulverized powder K without using plant fiber flakes L.
The blending composition is kenaf fiber 4 wt%, wood waste material pulverized powder J 36 wt%, and resin waste material pulverized 34 wt%.
The bending strength and Young's modulus of the molded product obtained by single layer molding in this composition (the cross-sectional dimension of the test piece used for the strength test is 60 × 30 mm) was measured.

[Comparative Example 3]
In Comparative Example 3, a molded product was produced using the kenaf fiber M, the wood waste material pulverized powder J, and the resin waste material pulverized powder K without using the plant fiber flakes L.
The blending composition is 42 wt% kenaf fiber and 44 wt% pulverized resin waste.
The bending strength and Young's modulus of the molded product obtained by single layer molding in this composition (the cross-sectional dimension of the test piece used for the strength test is 60 × 30 mm) was measured.

[Comparative Example 4]
In Comparative Example 4, a molded product was produced using only the wood waste material pulverized powder J and the resin waste material pulverized powder K.
The blending composition is wood waste material pulverized powder 50 wt% and resin waste material pulverized powder K 41 wt%.
The bending strength and Young's modulus of the molded product obtained by two-layer molding with this blending composition (the cross-sectional dimension of the test piece used for the strength test is 145 × 30 mm) were measured.

Table 1 shows the results of the strength test of the wood-like molded article 1 or the molded article produced under the conditions of Examples 1 and 2 and Comparative Example 1-4.

From the results of Table 1, when Comparative Example 1 and Comparative Examples 2 and 3 are comparatively weighed, by adding kenaf fiber M and kneading, only wood waste material pulverized powder J and resin waste material pulverized powder K are used. A slight improvement in strength was confirmed.
Moreover, when Comparative Example 2 and Comparative Example 3 were weighed comparatively, it was confirmed that the strength was slightly improved when the content of kenaf fiber M was 42 wt% compared to when the content of kenaf fiber M was 4 wt%.
Furthermore, when Examples 1 and 2 and Comparative Examples 2 and 3 are comparatively weighed, as compared with the case where the kenaf fiber M is mixed with the wood waste material pulverized powder J and the resin waste material pulverized powder K, the plant fiber flakes L are obtained. It was confirmed that the strength when using the kenaf fiber M was dramatically improved.
Moreover, when Example 1 and Example 2 were weighed comparatively, it was confirmed that there was almost no influence on the strength properties depending on whether or not the polypropylene used as the resin waste material pulverized powder K was acid-modified.
In addition, when Examples 1 and 2 and Comparative Example 4 are weighed comparatively, both the molding methods are two-layer molding, and depending on whether or not the plant fiber flakes L are contained, strength physical properties (particularly bending strength) There is a big difference.
Furthermore, when Comparative Example 1 and Comparative Example 4 are comparatively weighed, both do not contain kenaf fibers M, and the strength physical properties (particularly bending strength) can be obtained only by the difference in molding method between two-layer molding and single-layer molding. It was confirmed that there was almost no effect.
From the above, the molded article containing the kenaf fiber M has higher strength properties than the molded article not containing, and particularly when the contained kenaf fiber M is obtained by pulverizing the vegetable fiber flakes L, the strength physical property is dramatically increased. It was confirmed that it improved.
Note that the difference in the cross-sectional dimensions (145 mm or 60 mm) of the test pieces was not taken into account because the calculation of the cross-section coefficient was performed at the time of calculation.

  The effects of the content of the kenaf fiber M and the particle size of the vegetable fiber flake L on the physical properties of the wood-like molded product 1 were examined as Examples 3 and 4 below.

[Example 3]
In Example 3, as the vegetable fiber flake L, a kenaf board 118 (manufactured by Toyota Boshoku Co., Ltd.) formed by mixing an acid-modified thermoplastic resin and kenaf fiber M was used.
As the acid-modified thermoplastic resin, an acid-modified polypropylene resin (weight average molecular weight 40,000, 60 ° C. melt viscosity 16,000, oxidation 26, manufactured by Sanyo Chemical Industries, Ltd.) was used.
Four samples in which the content of kenaf fiber M was 10 wt% (10 parts), 19 wt% (20 parts), 29 wt% (30 parts), and 38 wt% (40 parts) were produced.
The wood-like molded product 1 obtained under these conditions was measured for bending strength, Young's modulus and Charpy value.
The results are shown in FIGS.
From FIG. 4, it was confirmed that the bending strength was improved as the content of the kenaf fiber M was increased. The Young's modulus increases as the content increases in the range where the content of the kenaf fiber M is 29 wt% (30 parts) or less, and no significant improvement is observed in the range of 29 wt% (30 parts) or more. It was.
From FIG. 5, it was confirmed that the Charpy value was maximized when the kenaf fiber M was 29 wt% (30 parts).

[Example 4]
In Example 4, as the plant fiber flake L, a kenaf board 118 (manufactured by Toyota Boshoku Co., Ltd.) formed by mixing an acid-modified thermoplastic resin and a kenaf fiber M was used.
As the acid-modified thermoplastic resin, an acid-modified polypropylene resin (weight average molecular weight 40,000, 60 ° C. melt viscosity 16,000, oxidation 26, manufactured by Sanyo Chemical Industries, Ltd.) was used.
Three samples with the vegetable fiber flakes L having a particle size of 10, 15, and 20 mm were prepared.
The wood-like molded product 1 obtained under these conditions was measured for bending strength, Young's modulus and Charpy value.
The results are shown in FIGS.
From FIG. 6, it was confirmed that no significant tendency was observed in bending strength even if the particle size of the vegetable fiber flakes L was different. Moreover, about the Young's modulus, it has confirmed that it became maximum when the particle size of the vegetable fiber flakes L was 15 mm.
From FIG. 7, it was confirmed that the Charpy value was improved as the particle size of the plant fiber flakes L was increased.

DESCRIPTION OF SYMBOLS 1 Wood-like molded product 2 Hollow prismatic main-body part 30 Extruder 31 Cylinder 32 Screw 33 Hopper 34 Die 35 Water tank 40 Sizer part 41 Opening part 101 Wood waste 102 Crushing device 103a Eddy current sorter 103b Specific gravity sorter 104 Crusher 106 Grinding device 108 Mixing mixer 109 Inorganic pigment charging unit 110 Resin waste material 112 Mixed material (melt)
113 Cooler mixer 114 Cooler pulverizer 115 Extrusion product 116 Crusher 117 Cutting device 118 Kenaf board (fiber composite material)
119 Pulverizer A Primary pulverization process B Fractionation process C Secondary pulverization process D Tertiary pulverization process E Kneading process F Molding process G Surface treatment process H Cutting process J Wood waste pulverized powder (cellulose-based fine particles)
K resin waste material ground powder (first thermoplastic resin, first thermoplastic resin waste material)
L Plant fiber flake M Kenaf fiber (plant fiber)
N Polypropylene resin (second thermoplastic resin)

Claims (7)

This is a method for producing a wood-like molded article obtained by kneading and melting a mixed material containing cellulosic fine particles obtained from wood, a first thermoplastic resin, and a fiber composite, and extruding or injection molding. And
The fiber composite material is obtained by kneading plant fiber and the second thermoplastic resin in advance,
Crushing the fiber composite,
The cellulosic fine particles, the first thermoplastic resin, and the pulverized fiber composite material are kneaded and melted into a melt,
A method for producing a wood-like molded product, comprising subjecting the melt to extrusion molding or injection molding. Kneaded and melted a mixed material containing cellulose-based fine particles obtained from a wood waste containing impurities, a first thermoplastic resin waste obtained from a thermoplastic resin waste containing impurities, and a fiber composite, and extruded. Or a method for producing a wood-like molded product formed by injection molding,
The fiber composite material is obtained by kneading plant fiber and the second thermoplastic resin in advance,
Crushing the fiber composite,
The cellulosic fine particles, the first thermoplastic resin waste material, and the pulverized fiber composite material are kneaded and melted into a melt,
A method for producing a wood-like molded product, comprising subjecting the melt to extrusion molding or injection molding. In the manufacturing method of the wood-like molded article of Claim 1 or 2,
A method for producing a wood-like molded article, wherein the fiber composite material is pulverized into flakes and then kneaded. In the manufacturing method of the wood-like molded article as described in any one of Claim 1 to 3,
A method for producing a wood-like molded product, characterized in that the diameter of the fiber composite material is pulverized to a size of 5 mm to 20 mm. In the manufacturing method of the woody-like molded product according to any one of claims 1 to 4,
A method for producing a wood-like molded article, wherein kenaf fibers are used as the vegetable fibers.   A wood-like molded article comprising a cellulose-based fine particle obtained from wood, a first thermoplastic resin, and a fiber composite material containing vegetable fibers and a second thermoplastic resin.   Cellulosic fine particles obtained from a wood waste material containing impurities, a first thermoplastic resin waste material obtained from a thermoplastic resin waste material containing impurities, and a fiber composite material containing a vegetable fiber and a second thermoplastic resin A wood-like molded product characterized by that.

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