JP2891645B2 - Wood-like product manufacturing method and wood-like product - 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 producing a wood-like product such as various parts such as furniture in a house and various products such as interior parts of a vehicle and the like. .

[0002]

2. Description of the Related Art As a technique related to the present invention, PC
T JP94 / 00351 (International publication number; WO94
/ 20280) "cellulose-based fine powder,
The technology of "wood-like molded articles and wood-like products" will be briefly described. The ground powder obtained by pulverizing the cellulose material as a raw material is subjected to a grinding treatment to obtain a powder particle having an increased bulk specific gravity, and a surface particle having a smaller diameter and harder than the powder particle is fixed to the outer peripheral surface of the powder particle. The fixed particles are mixed with a resin and a pigment and melted, and thereafter or simultaneously with the melting, formed into a desired shape by extrusion or injection molding. Then, it is possible to provide a method of manufacturing a wood-like product and a wood-like product having a pattern very close to the grain of a natural tree on the surface and having a feeling such as a touch feeling similar to that of a natural tree.

[0003] As means for forming the pigment so as to flow irregularly in order to produce a molded article very close to natural wood, as disclosed in the specification of PCT JP94 / 00351, as disclosed in the specification of PCT JP94 / 00351 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 have been adopted.

[0004]

However, in the case of the above-mentioned technique, the finally manufactured molded product is limited to a molded product having a constant cross-sectional shape in the minus direction, and the cross-sectional shape is not uniform in one direction. On the other hand, a means for producing a wood-like product having a surface that is irregular and very close to the grain of a natural tree has not been established. For example, there has not been provided a molded product in which the cross-sectional area at the center in the extrusion direction is larger than the cross-sectional area at both ends.

[0005] The problem to be solved by the present invention is to provide a technique for producing a wood-like product having a pattern whose cross-sectional shape is not fixed in one direction and which has a pattern close to the grain of a natural tree or a grain of wood. is there. Here, an object of the invention described in claims 1 to 6 is to blow-mold a wood-like product having a cross-section that is not constant in one direction and has a pattern of a natural wood color or a grain very close to the surface. Is to provide a method of manufacturing.

Another object of the present invention is to provide a wood-like product by blow molding having a cross-sectional shape that is not constant in one direction and has a pattern very close to the grain of a natural wood on the surface. is there.

[0007]

SUMMARY OF THE INVENTION The present invention is to achieve the above object. In the method for producing a wood-like molded product according to claim 1, the surface of the cellulose-based fine powder is
Fixation of hard and fine powder smaller than the fine powder of the above into fixed particles, mixing resin and pigment with the fixed particles, melting and extruding to form a parison, and blow molding the parison A method for producing a wood-like molded product, characterized in that a molded product is produced by the method.

[0008] As the "cellulose material" here, besides wood, it is also possible to use bacas, rice straw and the like.
It is possible to use wood scraps and sawdust generated when building a house or the like. In addition, the `` milling treatment '' to increase the bulk specific gravity is to remove excess whisker-like fiber parts from pulverized powder that is not in the form of particles and most of which fibers are in the form of whiskers. Refers to processing. The powder formed by the attrition process has no whisker-like protrusions from the crushed powder, so that water (including moisture),
The expansion and contraction caused by adsorbing or releasing the solvent is extremely small, and therefore, the wood-like product containing the powder becomes extremely excellent in dimensional stability.

For the grinding treatment, any kind of processing machine can be used as long as it can eliminate an extra beard-like fiber portion. For example, when processed by a ball mill using crushing balls, a beard-like fiber portion can be eliminated, and a grinding process can be performed. In addition, the size can be made uniform at the same time as the grinding process, and further, by adding the surface particles into a ball mill, the next step of “fixing the surface particles” can be performed at the same time.

The above “surface particles” have a smaller diameter than the powder particles,
Any hard material can be used. For example, one of inorganic materials, metal materials and plastic materials can be used.
Alternatively, a plurality of materials can be used. For example,
It is a metal material such as titanium oxide, ferrite, aluminum, nickel, and silver, or a nonmetal material such as ceramic. When white inorganic pigments are used as surface particles, the fixed particles become white, so they can be used not only to make molded products look like whitish wood, but also to use pigments of other colors when molding molded products It can also be used for moldings that resemble dark or brown wood.
In addition, in this wood-like product, when inorganic pigments are used as surface particles, heat resistance is improved, so that compared to the case of simply mixing and molding pulverized powder, the heat effect at the time of molding is small,
Therefore, deterioration such as a change in color or shape is suppressed.

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

The proportion of the fixed grains mixed with the resin relative to the whole is set not to exceed 30% by weight. This is because the fluidity at the time of molding deteriorates, and there is a problem in 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 grains. It is characterized in that it is formed by melting a product material provided with a plurality of types of wood-like seed materials.

[0013] The "woody seed material" as used herein means:
Those consisting of resin only, those consisting of resin and pigment,
Includes resin and fixed particles. In addition, the “product material” always contains pigments and fixed grains. That is, when the “product material” includes the “woody forming seed material” made of only the resin, the other “woody forming seed material” includes the pigment and the fixed grains. However, the ratio of the fixed grains mixed with the resin to the entire base material is set not to exceed 30% by weight. This is because the fluidity at the time of molding deteriorates, and there is a problem in molding.

According to a third aspect of the present invention, there is provided a method for producing a woody product.
The method for producing a wood-like product according to claim 2 is technically limited, and the wood-like formed seed material is a wood-like formed pellet obtained by mixing a pigment and fixed grains with a resin to form a pellet. It is characterized by. As a technique for “forming a resin into a pellet”, conventionally known means such as melting a material such as a powder or a solid, extruding a string from a perforated circular nozzle, and cutting the material is used.

The method for producing a wood-like product according to claim 4 is technically limited to the method for producing a wood-like product according to claim 2 or 3, and comprises a seed of a wood-like forming material. The material is characterized in that it is formed such that its flowability at the time of melting is lower than the flowability at the time of melting of other woody formed seed materials.

As a means for providing a difference in fluidity of the wood-like forming material seed material, a known means such as adding a variety of additives to one or both of them in addition to different kinds of resin 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 comprises:
It is characterized in that its melting temperature is higher than the melting temperature of other wood-like pellets.

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 include, for example, fixed particles and pigments mixed with the wood-like forming material pellet. This can be achieved by increasing the proportion of the fixed grains and pigments to be mixed with the other wood-like 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 includes pigment and immobilized resin powder. It is characterized by a wood-like forming compound in which grains are mixed. "Wood-like seed material"
In the case of a resin alone, there are cases where only a pigment is mixed with a resin, and thus there are cases where only a resin compound is used or a resin compound which contains only a pigment.

[0018] The wood-like molded product according to claim 7 is a cellulosic product.
On the surface of fine powders
Wood is produced by fixing fine powder to fixed particles, mixing resin and pigment with the fixed particles, melting and extruding to form a parison, and subjecting the parison to blow molding. It is a molded product.

[0019]

The operation of the method for producing a wood-like molded product according to claim 1 will be described. The crushed powder obtained by crushing the cellulose material is subjected to grinding treatment to obtain powder particles, and a fixed particle having a smaller diameter and a harder surface than the powder particles is fixed to the outer peripheral surface of the powder particles to obtain fixed particles. By mixing and melting a resin and a pigment, a raw material for parison is completed. The parison is formed by extruding this raw material into a hollow tube. 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. In the case of a tree color.

By performing blow molding on the parison as described above, a hollow molded article can be manufactured.
The parison does not prevent 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 described in claim 1 and has the following operation. That is, by melting the product material provided with a plurality of types of wood-like forming seed materials, a flowing grain pattern is easily formed.

The method for producing a woody product according to the third aspect has the following effect, unlike the method for producing a woody product according to the second aspect. That is, since the wood-like forming seed material is in the form of pellets, if a lapse of time or a spatial movement is required until the product material is manufactured, the wood-like forming seed material is in a powder state. It is less likely to deteriorate as compared with the case of the woody compound (claim 6). Further, the woody forming compound of the sixth aspect of the present invention is easy to mix the resin with the woody forming compound, whereas the resinous mixture is difficult when the compound is in the form of pellets, so that the grain pattern tends to appear clearly.

The method for producing a wood-like product according to the fourth aspect has the following effects, unlike the method for producing a wood-like product according to the second or third aspect. That is, since the fluidity of one woody forming material seed material at the time of melting is lower than the fluidity of another woody forming material seed material at the time of melting, the woody forming material seed material having a lower flowability is used. The flow becomes worse. Therefore, the pigment contained therein is difficult to uniformly flow and mix during molding, and the pattern appearing on the surface of the final molded article is close to a natural grain pattern.

The method for producing a wood-like product according to claim 5 has the following effect, unlike the method for producing a wood-like product according to claim 4. That is, a low melting temperature is set among a plurality of wood-like pellets. For this reason, the melting temperature of the wood-like forming material pellet having a higher melting temperature does not reach the melting temperature, so that the melting state is insufficient and the fluidity deteriorates. Therefore, the pigment contained in the seed material of the wood-like forming material having the lower fluidity does not flow evenly at the time of molding, so that the pattern appearing on the surface of the final molded article is close to the natural 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 works as follows. That is, since the wood-like forming seed material is a wood-like forming compound, the heat energy and time required for melting are less than in the case of a pellet.

The woody product described in claim 7 is formed as follows. First, a cellulose material is pulverized to obtain a pulverized powder. Next, the ground powder is ground and
Get the grains. Next, surface particles are fixed to the powder particles to obtain fixed particles. The fixed particles are mixed with the resin together with the pigment, melted and extruded to form a parison. The parison is blow-molded to produce wood-like products. The parison does not prevent elongation during molding.

On the surface of the parison, fixed grains and pigments are mixed to form a pattern. When the fixed grains and pigment are completely mixed, the color of the wood is exhibited, and a plurality of types of woody seeds are formed. If the wood is not completely mixed, a pattern very similar to the grain is formed.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on embodiments and 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 where a parison is pushed out. FIG. 2 is a side view (a parison is a cross-sectional view) showing how a parison is put into a molding die. FIG. 3 is a side view showing a state where blow molding is performed on the parison (the parison portion is a cross-sectional view). FIG. 4 is a side view showing a state where the molding die is removed after the blow molding. FIG.
FIG. 4 is a side view showing a state in which a second parison is put into a molding die and a molded product having been molded is pinched off.

In the method for producing a woody molded product of this embodiment, first, a pulverized powder obtained by pulverizing a cellulose material is subjected to a grinding treatment.
Then, a fixed particle is formed by fixing a surface particle having a smaller diameter and harder than the particle to the outer peripheral surface of the particle. For the production of fixed grains, a method disclosed in PCT JP94 / 00351 (International Publication No. W094 / 20280) can be used. Therefore, a detailed description is omitted in this embodiment.

Next, a woody seed material is formed using the fixed grains. That is, a woody-like seed material in which a pigment and fixed grains are mixed with a resin is formed. This wood-like forming seed material may be a wood-like forming compound obtained by merely mixing resin powder, pigment powder and fixed grains, but the mixture is melted, extruded into a string form from a perforated circular nozzle and cut into pieces. A shaped pellet may be prepared and used. If it does so, it will be harder to absorb moisture than a woody compound at the time of transportation, storage, etc., and it will be easy to maintain the same quality and it is convenient. 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 pellets.

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, etc. could be adopted. Vinyl resin, polyethylene resin, polypropylene resin, and polystyrene resin were suitable for easy blow molding.

The pigment used for the wood-like forming seed material is, for example, one or several kinds of organic pigments or inorganic pigments such as iron oxide, cadmium yellow, and carbon black in accordance with the desired color of the final molded article. Select and use. The woody seed material used in this embodiment is a mixture of a resin and about 20% by weight of fixed grains and 1 to 30% by weight of a pigment. Here, the practical range of the mixing ratio of fixed grains is 1 to the whole wood-like seed material.
It is about 0 to 50% by weight. If the fixed particles are less than 10% by weight, the final molded article does not have a woody feeling, and if it is more than 50% by weight, the fluidity during molding is deteriorated. Further, the practical range of the compounding ratio of the pigment is about 0.1 to 30% by weight based on the whole woody seed material.

A plurality of types of wood-like forming seed materials having different mixing ratios of fixed grains and different types of pigments are prepared in advance, and the wood-like forming seed materials are adjusted to have a desired color in the final molded article. In addition, one type or several types may be selected and used. Further, a resin pellet formed only of a resin and a wood-like seed material may be mixed.

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

In melting the product material, the parison molding temperature is set in accordance with the pellet having the lower melting temperature, ie, 180 ° C., and the molding time is also set in accordance with the pellet having the lower melting temperature. One pet then melts normally and flows uniformly in the molding direction, while the other wood-like forming material pellets do not melt well and therefore flow poorly and become non-uniform. Since the flow is poor and non-uniform, the pigment in the pet also does not flow evenly, and the extruded molding material 10 is unevenly colored with the pigment inside and in the surface layer. In the surface layer portion of No. 10, uneven coloring occurs in the colored portion, and the color portion is close to a natural grain pattern.

The molten product material is extruded from an extruder 20 to form a parison 10 as shown in FIG. The extruder 20 includes a blower 30 for blowing air into the parison 10 and a blowing nozzle 31.
It has. In addition, the formed parison 10 has a pattern close to a natural grain pattern in the surface layer as described above.

Next, as shown in FIG. 2, the parison 10 is closed by sandwiching the inside of the molding machine 40 of the mold portions 41, 41 such that the inner surface becomes the outer surface of the molded product. The molding machine 40 is for producing a bottle-shaped molded article, and cutters 45, 45 for cutting off the completed molded article 11 are provided at opposing portions at the bottom end of the mold sections 41, 41, and a mold section. The cooling water passages 46, 46, 46, 46 for passing the cooling water for cooling the cooling water 41 are provided.

Next, as shown in FIG.
The air bubbles are blown out from the blowing nozzle 31, and the parison 10 expands and is pressed against the inner surfaces of the mold portions 41, 41. In this state, the cooling water flows through each cooling water passage 46 to cool the parison 10, and a bottle shape having a pattern close to a natural wood pattern is solidified. Next, as shown in FIG. 4, the two mold parts 41, 41 are separated, and the extruder 20 removes the first molded product 11 already formed in a bottle shape.
A new parison 10 is extruded.

Next, as shown in FIG. 5, the two mold parts 41, 41 are brought together again. Then, when the cutters 45 provided at the bottom end of the molding machine 40 are brought together, the first molded article 11 is separated from the new parison 10 and falls. On the other hand, for the new parison 10,
Air is blown out from the blowing nozzle 31 of the blowing machine 30, and the parison 10 expands and is pressed against the inner surfaces of the mold portions 41, 41, whereby the second molded product 12 is formed.

Next, the effects of the above embodiment will be described. According to the above-described embodiment, there is an effect that a method for manufacturing a wood-like product having a pattern very close to the color or grain of a natural tree on the surface by blow molding can be provided. Next, variations of the above-described embodiment will be described.

The above-described embodiment is merely an example of blow molding, and the present invention can be applied to blow molding means other than the above blow molding. For example, depending on the type of resin used for the molding material, production efficiency may be poor after cooling, and in that case, blow molding means that does not use cooling equipment is employed.

[0041]

According to the invention as set forth in claims 1 to 7, a wood-like product having a pattern whose cross-sectional shape is not constant in one direction and has a pattern very close to the grain of a natural tree or grain is provided. A method of manufacturing by blow molding could be provided. According to the invention of claim 8, it is possible to provide a wood-like product by blow molding having a pattern whose cross-sectional shape is not constant in one direction and which is very close to the grain of a natural tree on the surface.

[Brief description of the drawings]

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

FIG. 2 is a side view (a parison is a cross-sectional view) showing how a parison is put into a molding die.

FIG. 3 is a side view (a parison is a cross-sectional view) showing a state in which blow molding is performed on the parison.

FIG. 4 is a side view showing a state where a molding die is 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 which has been molded is pinched off.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Molding material 11 1st molded article 12 2nd molded article 20 Extruder 30 Blowing machine 31 Blowing nozzle 40 Molding machine 41 Mold part 45 Cutter 46 Cooling channel

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B29K 503: 00 511: 14 B29L 22:00

Claims (7)

(57) [Claims] 1. The fine powder of cellulose is applied to the surface of the fine powder.
A fixed product having a smaller diameter than the hard powder is fixed to form fixed particles, a resin and a pigment are mixed with the fixed particles, melted and extruded to form a parison, and the parison is blow-molded to form a molded article. A method for producing a wood-like molded product, comprising: 2. The parison according to claim 1, wherein the parison is formed by melting a product material provided with a plurality of types of woody seed materials having different mixing ratios of resin, pigment and fixed grains. Method of manufacturing wood-like products. 3. The method for producing a wood-like product according to claim 2, wherein the wood-like seed material is a wood-like formed pellet obtained by mixing a resin with a pigment and fixed grains to form a pellet. 4. The method according to claim 1, wherein the one woody forming seed material has a lower fluidity at the time of melting than the other woody forming seed material at the time of melting. The method for producing a woody product according to claim 2 or 3. 5. The production of wood-like products according to claim 4, wherein one wood-like forming material pellet is formed such that its melting temperature is higher than the melting temperature of the other wood-like forming pellets. Method. 6. A method for producing a wood-like product according to claim 2, wherein said wood-like forming seed material is a wood-like forming compound in which a pigment and fixed grains are mixed with resin powder. 7. The fine powder of cellulose is applied to the surface of the fine powder.
A smaller diameter than, and hard fine powder is fixed to a fixed particle, produced by the fixed grain resin and pigment were mixed, and extruded by melt forming a parison is subjected to blow molding parison A wood-like molded product characterized by the following.