JPH08207125A - Woody product and production thereof - Google Patents

Abstract

PURPOSE: To produce a woody product not constant in its cross-directional shape in one direction and having patterns near to natural grain by grinding a ground powder of a cellulose material to form powdery particles and fixing specific surface particles to the outer peripheral surfaces of the powdery particles and mixing a resin and pigment with the obtained particles and extruding the resulting mixture in a molten state to form a parison and subjecting the parison to blow molding. CONSTITUTION: A ground powder obtained by grinding a cellulose material is ground to form powdery particles enhanced in bulk specific gravity and surface particles smaller and harder than the powdery particles are fixed to the outer peripheral surfaces of the powdery particles to form fixed particles. Next, pigment and the fixed particles are mixed with a resin to form a woody forming seed material and two kinds of the woody forming seed materials are mixed and melted to be extruded from an extruder 20 to form a parison 10. Next, the parison 10 is confined in a molding machine 40 having mold parts 41, 41 of which the inner surfaces have the outer surface of a molded product and two mold parts 41, 41 are fitted to each other to blow air into the parison from a blow nozzle and cooling water is allowed to flow through respective cooling water channels 46 to cool the parison 10.

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 a product having a woody appearance such as various parts such as furniture in a house, and various products such as an interior member of a vehicle, and a product thereof. .

[0002]

2. Description of the Related Art As a technique related to the present invention, a PC
T JP94 / 00351 (International Publication Number; WO94
/ 20280) "Cellulose-based fine powder particles,
The technology of "wood-like molded product and wood-like product" will be briefly described. The pulverized powder obtained by pulverizing the cellulose material as a raw material is ground to obtain powder particles having an increased bulk specific gravity, and fixed on the outer peripheral surface of the powder particles, surface particles having a smaller diameter and a hardness smaller than the powder particles. Fixed particles are obtained by mixing the resin and the pigment with the fixed particles, melting the fixed particles, and thereafter or simultaneously with melting, forming into a desired shape by extrusion molding or injection molding. Then, it is possible to provide a method for producing a wood-like product and a wood-like product which have a pattern extremely close to the grain of a natural tree on the surface and have a texture such as a touch feeling similar to that of the natural tree.

[0003] Here, as a means for forming a pigment so as to flow irregularly in order to produce a molded product very close to natural wood, as disclosed in the specification of PCT JP94 / 00351. A means for molding using a base material formed by mixing fixed particles with resin and a seed material formed by mixing pigment and fixed particles with resin has been adopted.

[0004]

However, in the case of the above technique, the finally manufactured molded article is limited to a molded article whose cross-sectional shape is constant in one direction, and the cross-sectional shape is unidirectional. In contrast, no means has been established for producing woody products that have a texture on their surface that is not constant and closely approximates the grain of natural wood. For example, no molded product has been provided in which the cross-sectional area of the central portion in the extrusion direction is larger than the cross-sectional area of both end portions.

The problem to be solved by the present invention is to provide a technique for producing a wood-like product having a cross-sectional shape which is not constant in one direction and which has on the surface a shade of natural wood or a pattern very close to the grain of wood. . Here, an object of the invention according to claim 1 to claim 6 is to blow-mold a wood-like product having a cross-sectional shape that is not constant in one direction and a color of natural wood or a pattern very close to the grain on the surface. It is to provide a method of manufacturing by.

It is another object of the present invention to provide a blown wood-like product having a cross-sectional shape which is not constant in one direction and which has a pattern very close to the grain of natural wood on its surface. is there.

[0007]

The present invention is to achieve the above-mentioned object. The method for producing a wood-like molded product according to claim 1, wherein a pulverized powder obtained by pulverizing a cellulosic material is ground to obtain powder particles having a high bulk specific gravity, and the powder particles are provided on the outer peripheral surface of the powder particles. A fixed particle with a smaller diameter and harder surface is fixed to form a fixed particle.The fixed particle is mixed with a resin and a pigment, melted and extruded to form a parison, and the parison is blow molded to form a molded product. It is a method for producing a wood-like molded article characterized by producing.

As the "cellulosic material" mentioned here, it is possible to use bacas, rice straw, etc. in addition to wood. However, the use of wood facilitates the supply of raw materials and
It is possible to use wood scraps and sawdust generated when building a house. The "grinding process" to increase the bulk specific gravity is to remove the extra whisker-like fiber part from the crushed powder that does not form a grain shape and most of the fibers are in the state of protruding whiskers. Refers to processing. The powder particles formed by the grinding process have no whiskers-like protruding parts from the crushed powder, so water (including moisture), like conventional wood powder,
The expansion and contraction caused by adsorbing or releasing the solvent is extremely reduced, and thus the wood-like product containing the powder particles has extremely excellent dimensional stability.

The milling process can use any type of processing machine that is capable of eliminating excess whisker-like fiber portions. For example, by processing with a ball mill using crushing balls, the whisker-shaped fiber portion can be eliminated, and the grinding process can be performed. Further, at the same time as the grinding treatment, the size can be made uniform, and by adding the surface grains into the ball mill, the next step "fixing the surface grains" can be performed at the same time.

The above-mentioned "surface particles" have a smaller diameter than the powder particles,
If it is hard and hard, it can be used, for example, one of an inorganic material, a metal material, or a plastic material.
Alternatively, a plurality of materials can be used. For example,
A metal material such as titanium oxide, ferrite, aluminum, nickel, or silver, or a non-metal material such as ceramic. When white inorganic pigments are used as the surface particles, the fixed particles become white, so it can be used not only to make molded products resemble whitish wood, but also to use pigments of other colors when molding molded products. It can also be used for moldings that resemble blackish or brownish wood.
In addition, in this wood-like product, when an inorganic pigment is used as the surface particles, the heat resistance is improved, so there is less heat influence during molding, as compared with the case of simply mixing pulverized powder and molding,
Therefore, alterations such as changes in color and shape are suppressed.

The "resin" includes hard resin and soft resin, for example, vinyl chloride resin, expanded vinyl chloride resin, polyethylene resin, polypropylene resin, phenol resin,
Examples thereof include urethane resin, polyurethane resin, ABS resin, polystyrene resin and the like. The "pigment" is a colored pigment, and is, for example, an inorganic pigment such as iron oxide, cadmium yellow, or carbon black, or an organic pigment.

The ratio of the fixed particles mixed with the resin to the whole should not exceed 30% by weight. This is because the fluidity at the time of molding deteriorates, which hinders molding. The method for producing a wood-like product according to claim 2 is a technical limitation of the method for producing a wood-like product according to claim 1, and the parison has different mixing ratios of resin, pigment and fixed particles. It is characterized by being formed by melting a product material provided with a plurality of kinds of wood-like forming seed materials.

The term "wood-like seed material" used herein means
Those consisting only of resin, those consisting of resin and pigment,
Includes resin and fixed particles. Also, make sure that the "product materials" include pigments and fixed particles. That is, when the “product material” includes a “woody-like seed material” made of only a resin, the other “woody-like seed material” includes a pigment and fixed particles. However, the ratio of the fixed particles mixed with the resin to the whole base material is set not to exceed 30% by weight. This is because the fluidity at the time of molding deteriorates, which hinders molding.

A method for manufacturing a woody product according to claim 3 is:
The method for producing a wood-like product according to claim 2 is technically limited, and the wood-like forming seed material is a wood-like forming pellet formed by mixing a resin with a pigment and fixed particles to form a pellet. Is characterized by. As a technique for “forming the resin into pellets”, a conventionally known means of melting a material such as powder or solid and extruding it into a string shape from a porous circular nozzle and cutting it is used.

The method for producing a wood-like product according to claim 4 is a technical limitation of the method for producing a wood-like product according to claim 2 or claim 3, wherein a wood-like forming material seed is used. The wood is characterized in that its flowability when melted is lower than that of other wood-like forming seed materials when melted.

As a means for providing a difference in the fluidity of the wood-like forming material seed material, known means such as different kinds of resins and addition of various additives to one or both of them is used. The method for producing a wood-like product according to claim 5 is a technical limitation of the method for producing a wood-like product according to claim 4, wherein one wood-like forming material pellet is
It is characterized in that it is formed so that its melting temperature is higher than the melting temperature of other woody pellets.

As a means for forming the melting temperature of one wood-like forming material pellet to be higher than the melting temperature of another wood-like forming material pellet, for example, a fixed particle or a pigment mixed with the wood-like forming material pellet is used. This can be achieved by making the proportion higher than the proportion of fixed particles or pigments mixed with other wood-like forming pellets. The method for producing a wood-like product according to claim 6 is a technical limitation of the method for producing a wood-like product according to claim 2, wherein the wood-like forming seed material is a resin powder containing a pigment and a fixing agent. It is characterized in that it is a wood-like formation compound in which grains are mixed. "Wood-like formation seed material"
In the case of using only the resin, there may be a case where only the pigment is mixed with the resin, and therefore, there may be the case of using only the resin compound or the case of using the resin compound containing only the pigment.

In the wood-like molded article according to claim 7, pulverized powder obtained by pulverizing a cellulosic material is ground to obtain powder particles having an increased bulk specific gravity, and the powder particles are provided on the outer peripheral surface of the powder particles. It is manufactured by fixing particles having a smaller diameter and harder surface to form fixed particles, mixing the fixed particles with resin and pigment, and melting and extruding to form a parison, and subjecting the parison to blow molding. It is a wood-like molded product characterized by.

[0019]

[Operation] The operation of the method for producing a wood-like molded article according to claim 1 will be described. The pulverized powder obtained by pulverizing the cellulose material is subjected to grinding treatment to obtain powder particles having an increased bulk specific gravity, and fixed to the outer peripheral surface of the powder particles by fixing surface particles having a smaller diameter and harder than the powder particles. Then, by mixing the fixed particles with the resin and the pigment and melting the fixed particles, the raw material for the parison is completed. A parison is formed by extruding this raw material into a hollow tubular shape.At this time, the fixed particles and the pigment are mixed with each other to form a pattern on the surface of the parison, but the fixed particles and the pigment are completely mixed with each other. If it does, it will have a shade of wood.

By blow molding the parison as described above, a hollow molded article can be manufactured.
The parison does not interfere with the elongation during molding. Claim 2
The method for producing a wood-like product described in (1) is different from the method for producing a wood-like product according to claim 1 and has the following operation. That is, when the product material including the plurality of types of wood-like forming seed materials is melted, the flowed wood grain pattern is easily formed.

The method for producing a wood-like product described in claim 3 is different from the method for producing a wood-like product described in claim 2, and has the following operation. In other words, since the wood-like forming seed material is in the form of pellets, the wood-like forming seed material is in a powder state when a lapse of time or spatial movement is required until the product material is manufactured. Compared to the case of a wood-like compound (the case of claim 6), it is less likely to deteriorate. Further, in the method for producing a wood-like product according to claim 6, the wood-like forming compound easily mixes with the resin, whereas when it is in a pellet form, it is difficult to mix the resin, so that the wood grain pattern tends to appear clearly.

The method for manufacturing a wood-like product described in claim 4 is different from the method for manufacturing a wood-like product described in claims 2 to 3 and has the following operation. That is, since the fluidity of one wood-like forming material seed material during melting is lower than the fluidity of another wood-like forming material seed material during melting, the wood-like forming material seed material with lower fluidity The flow becomes poor. Therefore, since the pigment contained therein hardly flows uniformly during mixing and is difficult to mix, the pattern appearing on the surface of the final molded product becomes close to a natural wood grain pattern.

The method for producing a wood-like product described in claim 5 is different from the method for producing a wood-like product described in claim 4, and has the following operation. That is, the melting temperature is set to be low among the plurality of wood-like pellets. Therefore, since the melting temperature of the wood-like forming material pellet having a higher melting temperature is not reached, the melting state is insufficient and the fluidity deteriorates. As a result, the pigment contained in the seed material, which has a lower fluidity and does not flow uniformly during molding, causes the pattern that appears on the surface of the final molded product to approximate the natural wood grain pattern. .

The method for producing a wood-like product according to claim 6 is different from the method for producing a wood-like product according to claim 2,
It operates as follows. That is, since the wood-like formation seed material is the wood-like formation compound, the heat energy and time required for melting are less than those in the case of pellets.

The woody product according to claim 7 is formed as follows. First, the cellulose material is crushed to obtain crushed powder. Next, the crushed powder is ground to increase the bulk specific gravity and obtain powder particles. Next, surface grains are fixed to the powder grains to obtain fixed grains. The fixed particles are mixed with a pigment in a resin, melted and extruded to form a parison.
And by applying blow molding to the parison,
Manufacture wood-like products. The parison does not interfere with the elongation during molding.

On the surface of the parison, fixed grains and pigments are mixed to form a pattern, but when the fixed grains and pigments are completely mixed, a tree shade is exhibited, and a plurality of types of wood-like formation seeds are obtained. When the materials do not mix completely, a pattern that closely resembles wood grain is formed.

[0027]

Embodiments of the present invention will now be described with reference to the embodiments and the drawings.
This will be described in more detail. The drawings used here are FIGS. 1 to 5. FIG. 1 is a side view showing a state in which a parison is pushed out. FIG. 2 is a side view (a parison portion is a cross-sectional view) showing a state in which the parison is put into a molding die. FIG. 3 is a side view (a parison portion is a cross-sectional view) showing a state in which the parison is blow-molded. FIG. 4 is a side view showing a state in which the molding die is removed after the blow molding is completed. Figure 5
FIG. 6 is a side view showing a state in which the second parison is put into a molding die and the molded product that has been molded is pinched off.

In the method for producing a wood-like molded product of this embodiment, first, a pulverized powder obtained by pulverizing a cellulose material is ground to obtain powder particles having an increased bulk specific gravity. The fixed particles are formed by fixing the surface particles having a smaller diameter and harder than the powder particles. The production of fixed granules is done by PCT JP94 / 00.
The method disclosed in No. 351 (International Publication Number; WO94 / 20280) can be used. Therefore, detailed description is omitted in this embodiment.

Next, a seed material for forming a wood-like material is formed using the fixed grains. That is, a wood-like formation seed material in which a pigment and fixed particles are mixed with a resin is formed. This wood-like forming seed material may be a wood-like forming compound obtained by simply mixing resin powder, pigment powder and fixed particles, but the mixture is melted and extruded into a string shape from a perforated circular nozzle to be cut into wood. The shaped pellets may be prepared and used. This makes it easier to absorb moisture than wood-like molding compounds during transportation and storage, and it is easy and convenient to maintain the same quality. On the other hand, when the wood-like forming compound is used, the time and energy required for melting are smaller than those of the wood-like forming pellet.

As the resin used here, for example, vinyl chloride resin, foamed vinyl chloride resin, polyethylene resin, polypropylene resin, phenol resin, urethane resin, polyurethane resin, ABS resin, polystyrene resin and the like could be adopted. Vinyl resins, polyethylene resins, polypropylene resins, and polystyrene resins were preferable because they were easy to blow mold.

The pigment used for the wood-like formation seed material may be one kind or several kinds of organic pigments or inorganic pigments such as iron oxide, cadmium yellow, carbon black, etc., according to the desired shade of the final molded product. Select and use. The wood-like forming seed material used in this example is a mixture of about 20% by weight of fixed particles and 1 to 30% by weight of a pigment in a resin. Here, the practical range of the mixing ratio of the fixed grains is 1 with respect to the whole wood-like forming seed material.
It is about 0 to 50% by weight. This is because when the content of fixed particles is 10% by weight or less, the final molded product has no wood texture, and when it is 50% by weight or more, the fluidity at the time of molding becomes poor. Further, the practical range of the blending ratio of the pigment is about 0.1 to 30% by weight based on the whole wood-like forming seed material.

It is to be noted that a plurality of types of wood-like forming seed materials having different fixed particle mixing ratios and pigment types are prepared in advance, and the wood-like forming seed material is made to have a shade desired by the final molded product. In addition, one kind or several kinds may be selected and used. Further, resin pellets formed only of resin and a wood-like forming seed material may be mixed.

In this embodiment, two types (three or more types in some cases) of wood-like forming seed materials prepared in advance are mixed and melted. Each of the wood-like forming seed materials has a different melting temperature and a change in fluidity during melting. Specifically, the melting temperature of one wood-like forming pellet is 180 ° C. and the melting temperature of the other wood-like forming seed material is 185 ° C.

In melting the product material, the parison molding temperature is set according to the lower melting temperature of the pellets, that is, 180 ° C. here, and the molding time is also set according to the lower melting temperature of the pellets. Then, one of the pellets melts normally and flows uniformly in the molding direction, and the other wood-like forming material pellets do not have a sufficiently melted state, and therefore the flow is poor and becomes nonuniform. Since the flow is poor and non-uniform, the pigment in the pellet naturally does not flow uniformly, and the extruded molding material 10 has non-uniformly dispersed pigmented portions inside and on the surface layer. In the surface layer portion of 10, uneven coloring occurs in the colored portion, and it becomes close to a natural wood grain pattern.

The melted product material is extruded from extruder 20 to form parison 10 as shown in FIG. The extruder 20 includes a blower 30 and a blow nozzle 31 for blowing air into the parison 10.
It has. The parison 10 thus formed has a pattern close to a natural wood grain pattern in its surface layer portion as described above.

Next, as shown in FIG. 2, the parison 10 is enclosed by sandwiching it inside the molding machine 40 of the mold parts 41, 41 whose inner surface is the outer surface of the molded product. This molding machine 40 is for making a bottle-shaped molded product, and cutters 45, 45 for separating the finished molded product 11 and mold parts are provided at opposite parts at the bottom ends of the mold parts 41, 41. Cooling water passages 46, 46, 46, 46 for passing cooling water for cooling 41, 41 are provided.

Next, as shown in FIG. 3, the two mold parts 4
1, 41 are combined, air is blown out from the blowing nozzle 31, and the parison 10 swells and is pressed against the inner surfaces of the mold portions 41, 41. In this state, the cooling water is caused to flow through the cooling water passages 46 to cool the parison 10 and the bottle shape having a pattern close to the natural grain pattern is solidified. Next, as shown in FIG. 4, the two mold parts 41, 41 are separated from each other, and the first molded product 11 that has already been in the shape of a bottle is removed from the extruder 20.
A new parison 10 is hung at the lower end and is pushed out.

Next, as shown in FIG. 5, the two mold parts 41, 41 are fitted again. Then, the cutters 45, 45 provided at the bottom end of the molding machine 40 are combined to separate the first molded product 11 from the new parison 10 and drop it. On the other hand, for the new parison 10,
Air is blown from the blowing nozzle 31 of the blowing machine 30, the parison 10 swells and is pressed against the inner surfaces of the mold portions 41, 41, and the second molded product 12 is molded.

Next, the effect of the above embodiment will be described. According to the above-mentioned embodiment, there is an effect that it is possible to provide a method for producing a wood-like product having a color of natural wood or a pattern extremely close to the grain of wood on the surface by blow molding. Next, variations of the above-described embodiment will be described.

The above embodiments are merely examples of blow molding, and the present invention can be applied to blow molding means other than the blow molding described above. For example, depending on the type of resin used for the molding material, the cooling may result in poor production efficiency. In that case, therefore, a blow molding means that does not use cooling equipment is adopted.

[0041]

According to the inventions of claims 1 to 7, there is provided a woody product having a cross-sectional shape which is not constant in one direction and which has on the surface a shade of natural wood or a pattern very close to wood grain. It was possible to provide a method of manufacturing by blow molding. Further, according to the invention of claim 8, it is possible to provide a wood-like product by blow molding which has a pattern whose cross-sectional shape is not constant in one direction and which has a pattern very close to that of natural wood grain.

[Brief description of drawings]

FIG. 1 is a side view showing a state in which a parison is pushed out.

FIG. 2 is a side view (a parison portion is a cross-sectional view) showing a state in which a parison is put into a molding die.

FIG. 3 is a side view (a parison portion is a cross-sectional view) showing a state in which a parison is blow-molded.

FIG. 4 is a side view showing a state in which the molding die has been removed after blow molding.

FIG. 5 is a side view showing a state in which a second parison is put into a molding die and a molded product that has been molded is pinched off.

[Explanation of symbols]

10 Molding Material 11 First Molded Product 12 Second Molded Product 20 Extruder 30 Blowing Machine 31 Blowing Nozzle 40 Molding Machine 41 Mold 45 Cutter 46 Cooling Channel

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Claims (7)

[Claims] 1. A pulverized powder obtained by pulverizing a cellulosic material is ground to obtain powder particles having an increased bulk specific gravity, and surface particles having a diameter smaller than the powder particles and hard surface particles are provided on the outer peripheral surface of the powder particles. It is fixed to form fixed particles, and the fixed particles are mixed with resin and pigment, melted and extruded to form a parison, and the parison is blow-molded to produce a molded product. Molded article manufacturing method. 2. The parison is formed by melting a product material provided with a plurality of kinds of wood-like forming seed materials having different mixing ratios of resin, pigment and fixed particles. Method of manufacturing wood-like products. 3. The method for producing a wood-like product according to claim 2, wherein the wood-like formation seed material is a wood-like formation pellet formed by mixing a resin with a pigment and fixed particles to form a pellet. 4. The one wood-like forming material seed material is formed so that its fluidity upon melting is lower than that of another wood-like forming seed material upon melting. Item 2. A method for producing a woody product according to claim 2 or 3. 5. The production of a wood-like product according to claim 4, wherein one wood-like forming material pellet is formed so that its melting temperature is higher than the melting temperature of another wood-like forming pellet. Method. 6. The method for producing a wood-like product according to claim 2, wherein the wood-like formation seed material is a wood-like formation compound in which a pigment and fixed particles are mixed with resin powder. 7. A pulverized powder obtained by pulverizing a cellulosic material is ground to obtain powder particles having an increased bulk specific gravity, and surface particles having a diameter smaller than the powder particles and hard surface particles are provided on the outer peripheral surface of the powder particles. A wood-like molded article produced by fixing to form fixed particles, mixing the resin and pigment into the fixed particles, melting and extruding to form a parison, and subjecting the parison to blow molding.