JP3179952B2 - Method for manufacturing wood-like molded products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing various types of molded articles, such as, for example, peripheral boards in houses, skirting boards, rain gutters, furniture, and interior parts of vehicles. The present invention relates to a method for producing a molded article having a

[0002]

2. Description of the Related Art In recent years, attempts have been made to impart surface characteristics close to those of natural wood to synthetic resin moldings to make the surfaces of various furniture and daily necessities, as well as interior parts of vehicles, etc. natural wood-like. Is being done. In order to obtain such a wood-like resin molded product similar to natural wood, in addition to coloring the wood in a color tone similar to that of wood and giving it a woody taste, when molding a synthetic resin molded product, furthermore, a coating film or In forming a film or the like, a required amount of wood flour and a pigment corresponding to a desired color tone are added to a forming resin material to obtain a resin molded product having a color tone and texture close to the target natural wood.

[0003]

By the way, as the wood powder to be added to the resin material for forming the wood-like molded article as described above, wood is generally obtained by directly pulverizing wood into fine powder. . However, the wood flour obtained in this way has poor crushing efficiency regardless of whether it is obtained by a dry crusher or that obtained by a wet crusher. There was a disadvantage that a large amount of wood flour having a large particle size remained. In addition, this wood flour does not form a grain shape, and most of it is fibrous, and even if the particle size measured on the short diameter side is several microns, the long diameter side is long in a cilia shape. When used, the wood flours are often entangled with each other to create an agglomerated state, which has the disadvantage that they are not uniformly dispersed in the resin material. Further, since the particle size of the pulverized wood powder is extremely varied, a molded resin product is liable to cause molding distortion and the like, and has a disadvantage that the mechanical strength is partially different. Therefore, as a wood powder added to the formed resin material due to such inconvenience, those obtained by directly pulverizing wood into a fine powder form have limitations in terms of formulation, color, and quality control. .

[0004] In the above-mentioned wood flour, decomposition products such as lignin and wood acid gas are generated in the molding machine due to decomposition of the wood flour during resin molding. There is a problem in that the moldability of the resin is impaired. Therefore, it is common to perform a chemical treatment (neutralization treatment) with, for example, ammonia or urea. However, if such chemical treatment is performed, the decomposition of wood powder during resin molding cannot be reliably prevented unless the chemical treatment process is sufficiently controlled, and therefore the production control (treatment process control) must be strictly controlled. This is a major factor that raises production costs due to the need for wastewater treatment.In addition, wastewater used for treatment has a bad effect on the environment, so it is necessary to carry out the treatment sufficiently. Problem.

[0005] The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to have a pattern very close to the grain of a natural tree on the surface, and the texture such as a touch feeling is very close to that of a natural tree. It is an object of the present invention to provide a method for producing a wood-like molded product, which can produce a wooden-like molded product and eliminates inconvenience in using wood flour in the production.

[0006]

According to the method for producing a woody molded article of the present invention, a dough material pellet obtained by mixing a resin and a first colored pigment to form a pellet, Is supported on the surface and the moisture content is 4 to 10% by weight.
Cellulose-based fine particles and a resin, and mixed with a wood-like forming material pellets obtained by mixing and pelletizing a second colored pigment having a composition different from the colored pigment of the first composition, and mixing the pellet mixture. Forming into a desired shape by extrusion molding or injection molding is a means for solving the above problem.

[0007]

According to the method for producing a wood-like molded article of the present invention, a base material pellet having a first colored pigment and a wood-like pellet having a second colored pigment different in composition from the first colored pigment are provided. Since these colored pigments are mixed and flow non-uniformly in the molten material being formed because they are mixed and formed with the forming material pellets, the resulting molded product has streaky and non-uniform shaded colored portions. Is formed. In addition, since the water content of the cellulosic fine particles mixed into the wood-like forming material pellets is 4 to 10% by weight, the water evaporates at the time of molding, so that the streaky colored portion of the colored pigment is cut off. Since unevenness is generated and the surface of the obtained molded article is roughened, it becomes possible to produce a molded article having a wood-like feel and a touch feeling closer to a natural tree.

In addition, since the fine cellulose particles in the wood-like forming material pellets carry titanium oxide as a white pigment on the surface thereof, the titanium oxide comes closer to the surface than the colored pigment in the obtained molded article. By this, the color of the colored pigment under it is concealed, whereby the colored portion of the molded product surface formed by the colored pigment becomes more uneven in color and thickness, and the molded product obtained is more natural. It has a colored part close to a wood grain pattern. In addition, since the aggregate is made of cellulose-based fine particles having been subjected to attrition treatment and carrying titanium oxide on the surface, adsorption and suction of the resin by the fine particles are extremely reduced, and molding distortion is hardly caused.

[0009] Further, since the cellulose-based fine particles in the wood-like forming material pellets carry titanium oxide having a higher heat resistance on the surface than wood, the heat-resistant titanium oxide particles have a higher heat resistance than the cellulose-based fine particles before being supported. Therefore, compared to the case of simply blending and mixing cellulose-based fine particles such as wood flour, the heat effect during molding is less, and therefore the color and shape of the molded product caused by the thermal decomposition of the cellulose-based fine particles are reduced. Deterioration such as change is suppressed. In addition, the surface of the cellulose-based fine particles is covered by supporting the titanium oxide, thereby suppressing the release of lignin and wood acid contained in the fine particles during molding. Molding failure due to the release of water is prevented.

[0010]

Hereinafter, the present invention will be described in detail. The method for producing a wood-like molded article of the present invention comprises mixing a dough material pellet and a wood-like forming material pellet at a predetermined ratio, and molding the pellet mixture into a desired shape by extrusion molding or injection molding. Various types of decorative panels such as peripheral edges and skirting boards in furniture, furniture, etc., plate-shaped molded articles such as interior parts of vehicles, etc., tubular or almost semi-cylindrical molded articles such as rain gutters and brush shafts, Further, it is a method for producing various molded products such as a pencil shaft.

As the base material pellets, pellets obtained by mixing a resin, a first colored pigment, and various additives that are added as required, for example, a heat stabilizer and the like are used. As a resin used as a component of the pellet, a vinyl chloride resin, a polyethylene resin, a polypropylene resin, a phenol resin, an ABS resin, and the like are used. Among them, a vinyl chloride resin is more preferably used. As the first colored pigment, basically, cadmium yellow and iron oxide, yellow, red, such as carbon black, consisting of inorganic pigments of three colors of red, black, the color is particularly mixed color of the second colored pigment described below It is used in such a manner as to be brownish compared to the composition, and the amount of addition is 0.5-5
% By weight.

[0012] The dough material pellets are mixed, if necessary, with cellulose-based fine particles having been subjected to a grinding treatment and having titanium oxide supported on the surface, which are mixed with a wood-like forming material pellet described later. . In this case, the addition amount of the cellulosic fine particles is 5-6
It is about 0% by weight. The colored pigment is added to the resin in such a composition, and various additives, if necessary, cellulose-based fine particles are added at an appropriate ratio, and then mixed and pelletized to obtain a dough material pellet. Can be Pelletization is performed by a conventionally known means such as extruding the mixed powder into a string form from a porous circular nozzle and cutting it.

[0013] The wood-like forming material pellets are subjected to attrition treatment, and are provided with fine particles of cellulose having titanium oxide supported on the surface thereof, a resin, a second colored pigment, and various additives added as necessary. Are mixed and pelletized.

Cellulose-based fine particles subjected to attrition treatment and having titanium oxide carried on the surface are raw materials for various plant cell bodies such as coarsely ground wood, coarsely ground bacas, and coarsely ground rice straw. It is obtained by using a coarsely pulverized material as a starting material, subjecting it to a grinding treatment, and then carrying out a treatment for supporting titanium oxide on the finely divided particles. Here, the grinding process is
It refers to a process having both a crushing process and a polishing process, and may be a process of simultaneously performing the crushing process and the polishing process, or a process including two processes of performing the polishing process after performing the crushing process. Good. In other words, the grinding treatment referred to here is a grinding treatment for converting a coarsely crushed material into a finely crushed material as described later, and the finely crushed powder particles are entangled in a fiber state, and the surface thereof is covered with cilia. This refers to a process in which a polishing process of polishing the surface so as to reduce the amount of cilia on the surface from the shape of the granular material in the state in which the particles are in a state of being performed is combined.

In order to obtain a coarsely pulverized product as a starting material, the chips and the like are pulverized by mechanical impact crushing to obtain a coarsely pulverized powder having a particle size smaller than 150 mesh, preferably smaller than 120 mesh. Here, for mechanical pulverization, for example, an impeller mill (IMP-250; manufactured by Seishin Enterprise Co., Ltd.)
Is preferably used.

The grinding of the raw material (coarse pulverized material) is preferably performed by, for example, a ball mill shown in FIG. This ball mill is provided with a cooling jacket 2 on the peripheral wall of a mill body 1 which is open to the atmosphere. Cooling water is supplied from a supply pipe 8 into the cooling jacket 2 and discharged from a drain pipe 9 to circulate the cooling water. Thereby, the temperature in the mill body 1 is set to a preset temperature, for example, 80 ° C. or less.

Here, a motor 5 is provided on the top of the mill body 1, and a rotor 4 for stirring the balls 3 in the mill body 1 is provided on the bottom of the motor 5. The rotor 4 is rotated by the drive of the motor 5, and agitates the ball 3 and the material to be ground to bring them into mechanical contact. Further, an outlet 7 which is opened and closed by a valve 6 is provided at a lower portion of the conical shape of the mill body 1.
The material to be ground after the grinding processing can be discharged.

The ball 3 loaded into the mill body 1 of the ball mill is a ceramic ball having an outer diameter of 3 mm to 5 mm,
In particular, it is preferable to use zirconia-based or alumina-based ceramic balls, and it is desirable to avoid using metal balls such as stainless steel and steel. This is because, in the case of balls made of metal such as stainless steel or steel, there is a risk that ground cellulose powder such as wood powder may bind to the surface of the balls, or may cause deterioration of the ground powder due to heat generated by contact between the metal balls. Also, fragments of metal balls may be generated, and the fragments may be carried on the surface of the pulverized cellulose and may be different from desired fine powder particles.

The dry ball mill may be a closed type or an open-to-atmosphere type. When the closed type ball mill is employed, it is preferable to fill the mill with an inert gas such as nitrogen gas. preferable.

In this ball mill, the balls 3
Is adjusted to be in the range of 90 ° C. to 120 ° C. and the room temperature of the mill body 1 is adjusted not to exceed 80 ° C. The drying process is also performed at the same time. Here, regarding the temperature control of the balls 3 to be used, the capacity of the mill body 1, the amount of the balls 3 put into the mill body 1,
This is performed by adjusting the stirring speed, the amount of cooling by the cooling jacket 2 provided on the peripheral surface of the mill body 1, and the like, based on the material and dimensions of the mill and the charging temperature, amount, and moisture content of the charged pulverized material.

The surface temperature of the ball 3 varies depending on the target material.
It is preferable to set the temperature within the range of from 120 ° C to 120 ° C from the viewpoint of grinding efficiency. However, when a long time is required for grinding, the temperature is preferably from 90 ° C to 100 ° C from the viewpoint of preventing explosion.
If there is a risk of explosion during grinding,
It is preferable that the oxygen concentration in the mill body 1 be within 15%, in which case, for example, a method of continuously supplying nitrogen gas into the ball mill can be adopted.

According to the grinding treatment by such a ball mill, the internal temperature of the mill body 1 rises due to the frictional heat generated by the rotation of the balls 3, while the cooling water circulated through the cooling jacket 2 causes the mill body 1 By adjusting the internal temperature and the surface temperature of the ball 3 to the above ranges,
The pulverized raw material is pulverized and dried under appropriate heating conditions at the same time as drying, so that the particle size is adjusted to a desired range, for example, 100 μm or less, and the water content is about 3.0% by weight or less. It is adjusted to.

According to this treatment, the ball 3 comes into contact with the raw material pulverized material charged in the coarse powder state,
The raw material pulverized material that comes into contact with the ball 3 is pulverized into a finely pulverized material, and the surface is polished into fine particles having a surface with very few cilia. That is, when the crushed raw material comes into contact with the surface of the ball 3, it is mechanically crushed and abraded, crushed and polished, and simultaneously heated and dried, so that the water content is efficiently removed. . Further, since the fibers in the pulverized raw material are rapidly cooled when separated from the ball 3, the fibers in the raw material pulverized material are rapidly dried by being repeatedly subjected to heating and cooling. The portion is efficiently ground by the ball 3, and as a result, ground cellulose-based fine particles having an independent particle shape with little cilia on the peripheral surface are obtained.

The cellulosic fine particles thus obtained are classified, and the particle size in a desired range (for example,
10 μm, 10 to 20 μm, 20 to 50 μm, 50 to 1
00 μm) to obtain cellulose-based fine particles for supporting titanium oxide. Further, the grinding of the raw material pulverized material can be performed using, for example, a pulverizer 30 as shown in FIG. 2 instead of the ball mill shown in FIG. The crusher 30 utilizes the principle of stone pits. Two grindstones 31 are opposed to each other with a predetermined gap therebetween.
By rotating 1 at a high speed, a pulverizing process and a polishing process, that is, a grinding process are performed.

The grindstone 31 is a dish-shaped one whose inner surface is gradually inclined upward or downward as it goes to the center, and these have a wide center portion and a narrow peripheral portion. They are used by being arranged facing each other. These grindstones 31 have a donut plate shape with a mounting hole 32 formed in the center as shown in FIG. 3, and have a large number of feed grooves 33 formed on the inner surface thereof. The feed groove 33 is for smoothly guiding the workpiece in the radial direction of the grindstone 31 by the centrifugal force generated by the rotation of the grindstone 31.

In order to grind the raw material pulverized material by such a pulverizer 30, the raw material pulverized material is put between the central portions of two grindstones 31, and then one of the grindstones 31 is moved at a high speed. Rotate. Then, the raw material pulverized material is subjected to centrifugal force, impact force, shearing force and the like between the two grindstones 31 and 31 and is gradually pulverized.
Is moved to the radially outer peripheral side along ..., and in the process, it is pulverized by receiving an impact force and a shearing force, and its peripheral surface (surface) is polished. It becomes a milled cellulose fine powder having an independent particle shape with little cilia.

The cellulose fine powder thus obtained is also classified in the same manner as in a ball mill and adjusted to a desired particle size.
The cellulose-based fine particles of the present invention for supporting titanium oxide are obtained. Here, the use of titanium oxide as a pigment to be supported is thermally and chemically stable as described later,
Moreover, it is excellent in coloring power and hiding power. The particle size of the titanium oxide to be supported is adjusted to be sufficiently smaller than the cellulosic fine powder particles,
Specifically, those having a thickness of about 0.1 μm are preferable.

As a method of supporting the titanium oxide on the cellulose fine particles (milled fine particles), when the cellulose fine particles are obtained by a ball mill shown in FIG. And titanium oxide, and imparting mechanical and thermal energy mainly to impact force to the particles while dispersing the obtained mixed particles in the gas phase,
A method is employed in which cellulose-based fine particles are used as base particles, and titanium oxide particles are supported on the peripheral surface of the base particles. In other words, this method is a method utilizing the fact that titanium oxide particles are harder than cellulosic fine particles, and such a difference in hardness causes titanium oxide particles to sink or eat into the surface of cellulosic fine particles. It can be carried in the state of being inserted.

As another supporting method, particularly when cellulose fine powder is obtained by using the pulverizer 30 shown in FIG. 2, mixed particles of the cellulose fine powder and titanium oxide are shown in FIG. It is preferable that the titanium oxide particles are carried on the peripheral surface of the cellulose-based fine particles by charging the mixture into such a ball mill and performing the grinding treatment again. This is because, in the grinding process using a ball mill, as described above, frictional heat is generated in the process, and as a result, the drying process is performed at the same time.

However, the cellulose-based fine particles used in the wood-like forming material pellets have a water content of 4%.
To 10% by weight. This is because, when the amount is less than 4% by weight, natural unevenness and rough surface of the colored portion due to evaporation of water during molding hardly occur as described later.
This is because, depending on the amount of the cellulosic fine particles, the rate of occurrence of molding defects due to excessive moisture increases. Regarding such adjustment of the water content (moisture content), as described above, when the support treatment is carried out by the ball mill shown in FIG. For this reason, this is carried out by leaving it in the air to absorb moisture or forcibly adding moisture.

By carrying out such a supporting treatment, as shown in FIG. 4, the titanium oxide particles 10 are supported in a biting state on the peripheral surface of the cellulosic fine powder particles 11, whereby the grinding treatment is performed and the oxidation is carried out. Cellulose fine particles having titanium supported on the surface are obtained. The pigment-carrying cellulosic fine particles thus obtained have a color tone substantially the same as the color tone of titanium oxide, which is a white inorganic pigment, and agglomeration occurs both in the production process and the storage process of the supported fine powder particles. Was not observed. The upper limit of the amount of titanium oxide to be supported is an amount that overlaps the peripheral surface of the cellulose-based fine particles serving as the base particles and covers the peripheral surface. It is appropriately determined according to the hue to be performed.

As the resin used as the component of the woody pellet, the resin used for the above-mentioned fabric material pellets, that is, a vinyl chloride resin, a polyethylene resin, a polypropylene resin or the like is used, and among them, the vinyl chloride resin is preferably used.
When selecting the resin, it is naturally preferable to use the same resin as the resin used for the fabric material pellets.

As the second colored pigment, similarly to the first colored material used for the base material pellets, there are basically three colors of inorganic materials such as cadmium yellow, iron oxide, and carbon black. A pigment is used which is mixed so that the mixed color becomes yellowish as compared with the above-mentioned first colored pigment, and the amount of addition is 0.5 to 5% by weight of the whole pellet. Degree.
In addition, the compounding amount in the whole wood-like forming material pellet of the supported cellulose fine particles is 5 to 6 of the whole pellet.
0% by weight. Further, pelletization is performed by a conventionally known means as in the case of the dough material pellets.

The water content of the resin or colored pigment to be blended in the wood-like forming material pellets or the dough material pellets is so small as to be almost negligible.
Only the water content of the cellulosic fine particles exerts the above-mentioned effect in the molding described below. Further, when fine particles of supported cellulose are mixed with the above-mentioned dough material pellets, the moisture content is preferably basically 3% by weight or less, but even if it exceeds 3% by weight, the wood-like forming material pellets If the total moisture, which is the sum of the moisture content of the supported cellulose fine powder particles therein and the supported cellulose fine powder particles in the dough material pellets, is not more than the upper limit of the water content in the wood-like forming material pellets, there is no problem.

In the present invention, such a dough material pellet and a wood-like formed pellet are mixed, and the pellet mixture is heated and melted at about 180 to 210 ° C., and is extruded or injection-molded to obtain a desired shape. For example, a wood-like molded product is obtained by molding into various shapes such as a peripheral edge of a house, a skirting board, various decorative boards such as furniture, and further, an interior member shape of a vehicle. The mixing ratio between the dough material pellet and the wood-like formed pellet is appropriately determined based on the hue of the obtained molded article and the ratio of the colored pigment in each pellet,
Normally, fabric material pellet: wood-like forming material pellet = 9
0:10 to 99: 1 (weight ratio).

When extruding or injection molding a mixture of these pellets, the molding temperature is set in advance according to the melting temperature of the resin of each pellet, and the molding time is adjusted according to the shape of the target molded product.
In particular, it is set to the extent that the first colored pigment of the dough material pellet and the second colored pigment of the woody-like forming material do not mix sufficiently uniformly, in accordance with the woody material to be formed, which will be described later.

When molding is performed under such conditions, the dough material pellets and the wood-like forming material pellets melt and flow in the molding direction, whereby each resin, supported cellulose fine particles, the first colored pigment, the second colored pigment, The colored pigments are mixed with each other. However, since the molding time is set as described above,
The first and second colored pigments do not mix sufficiently uniformly until each pellet is melted and molded, and thus the resulting molded article has internal and surface layers as shown in FIG. The colored portions 20 of the colored pigment are unevenly scattered, and on the surface of the molded product, for example, when formed into a plate shape, as shown in FIG. The colored portions 20 having uneven streaks are formed. In addition, since the cellulosic fine particles to be mixed in the wood-like forming material pellets have a water content of 4 to 10% by weight, the water evaporates during molding to form streak-like colored portions 20 with colored pigments. Cuts and unevenness occur, resulting in a shape close to a natural grain pattern, and the surface of the obtained molded article has a roughness similar to that of a natural wood.

Moreover, especially in the surface layer of the molded product,
When the cellulosic fine particles carrying the titanium oxide in the wood-like forming material pellets reach the colored portion 20, the color of the colored portion 20 is concealed by the titanium oxide which is a white pigment. The density of the colored portion 20 (streak pattern) seen on the surface shown in the illustrated surface becomes more uneven, thereby making the colored portion 20 more similar to a natural grain pattern. In addition, since the cellulose-based fine particles carry thermally and chemically stable titanium oxide, decomposition of the cellulose fine particles during molding is suppressed without subjecting the cellulose fine particles to chemical treatment such as alkali treatment. can do.

[0039]

As described above, the method for producing a wood-like molded article of the present invention comprises the steps of: fabric material pellets having the first colored pigment; and second colored pigment having a different composition from the first colored pigment. The first and second colored pigments are mixed and flow non-uniformly in the molten material being molded, so that the molding is obtained by mixing and molding the wood-like forming material pellets having It is possible to form streaky and unevenly colored portions in the product. In addition, since the water content of the cellulose-based fine particles blended in the wood-like forming material pellets is 4 to 10% by weight, the water evaporates at the time of molding, so that the streaked colored portion of the colored pigment is cut off. Irregularities occur and the colored portion becomes more natural wood grain pattern, and since the surface of the obtained molded article is roughened, the touch feel becomes more natural wood feel. .

Moreover, since the fine cellulose particles in the wood-like forming material pellets carry titanium oxide, which is a white pigment, on the surface thereof, the titanium oxide comes closer to the surface than the colored pigment in the obtained molded article. By this, the color of the colored pigment under it is concealed, whereby the colored portion of the molded product surface formed by the colored pigment becomes more uneven in color and thickness, and the molded product obtained is more natural. It has a colored part close to a wood grain pattern. Therefore,
Since the production method of the present invention can obtain a molded article having a surface very close to natural wood like this,
When applied to the production of various molded products, for example, peripheral boards and skirting boards in houses, various decorative boards in furniture, interior materials for vehicles, etc., it can be obtained at a low production cost because it can be obtained by the same molding method as resin. Regardless, the appearance is almost the same as that of natural wood, and it is possible to obtain a much higher-grade appearance compared to the one obtained by printing a grain pattern on a resin molded product used as a conventional substitute .

When fibrous wood powder (cellulose-based fine particles) not subjected to the conventional grinding treatment is blended as an aggregate in the resin, a treating agent for alkali neutralizing the wood powder is used. Yellowing due to the effect of, furthermore it becomes a brown plate material, and molding distortion occurs due to sucking of resin, etc., but in the present invention, cellulose fine powder particles which only support titanium oxide and are not subjected to alkali treatment No discoloration occurs due to the use of, and furthermore, since the cellulosic fine particles are not fibrous but granular, the expansion and contraction is extremely small,
Therefore, the present invention using this provides a manufacturing method having extremely excellent dimensional stability during molding.

In addition, since the cellulose-based fine particles having been subjected to attrition treatment and carrying a pigment on the surface thereof are used as aggregates, the resin is hardly adsorbed and sucked by the fine particles, and molding distortion is almost caused. Disappears. In addition, in the obtained wood-like molded product, the heat resistance is improved as compared with that before loading since the cellulose-based fine particles support titanium oxide, and therefore, the cellulose-based fine particles such as wood powder are simply used. Compared with the case of compounding and molding, the influence of heat at the time of molding is small, and therefore, deterioration such as color and shape change is suppressed. In addition, by supporting titanium oxide, the surface of the cellulose-based fine particles is covered, thereby suppressing the release of lignin and wood acid contained in the fine particles due to thermal decomposition during molding. According to the production method of the present invention, it is possible to prevent molding defects caused by the release of the lignin and wood acid.

Further, the surface area of the cellulose-based fine particles is larger than that of conventional wood flour due to the support of the pigment. Therefore, the degree of adhesion between the fine particles and the resin in the obtained molded product is low. Increase. In addition, since the obtained wood-like molded article contains cellulose-based fine particles, it can be cut and nailed sufficiently with a saw, and can be handled almost in the same manner as wood. In this case, the workability such as installation on site is extremely excellent.

[Brief description of the drawings]

FIG. 1 is a fragmentary front view of an open type ball mill.

FIG. 2 is a schematic configuration diagram showing an example of a crusher used for a grinding process.

FIG. 3 is a plan view showing an example of a grindstone of the crusher shown in FIG. 2;

FIG. 4 is a cross-sectional view showing a state in which a white inorganic pigment of cellulosic fine powder used in the present invention is supported.

FIG. 5 is an enlarged side sectional view of the obtained molded product.

FIG. 6 is a perspective view showing a surface state of the obtained molded article.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mill body 3 Ball 10 Titanium oxide particle 11 Cellulose fine powder 20 Coloring part 30 Crusher

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-256528 (JP, A) JP-A-7-80907 (JP, A) JP-A-5-35344 (JP, A) Patent 2544310 (JP, A) B2) (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 47/00-47/96 B29B 7/00 B29C 45/18

Claims (1)

(57) [Claims] 1. A dough material pellet obtained by mixing and pelletizing a resin and a first colored pigment, and a water content of 4 to 10% by weight in which a grinding treatment is performed and titanium oxide is supported on the surface.
Cellulose-based fine particles and a resin, and mixed with a wood-like forming material pellets obtained by mixing and pelletizing a second colored pigment having a composition different from the colored pigment of the first composition, and mixing the pellet mixture. A method for producing a wood-like molded product, which is formed into a desired shape by extrusion molding or injection molding.