JPH10202660A - Manufacture of mosaic pattern product, mosaic pattern product and material for mosaic pattern product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce plastic wastes as much as possible and also reduce the manufacturing cost by crushing plastic manufactured by using resin as a base into crushed pieces, heat compressing the pieces and molding them into the desired shape. SOLUTION: At the time of molding or after molding, in the case of defective plastic products or plastic products to be thrown away are produced, first such products are crushed in the crushing process to manufacture crushed pieces. Then a desired shape is formed in the heat compression process in which the crushed pieces are heat compressed. Then a mosaic pattern molded product is manufactured. The mosaic pattern product thus manufactured is composed of mosaic pieces of different shapes and sizes combined all together, and a molded product of the taste of including no same shapes nor same sizes is provided. Recycling can be performed efficiently for the above-said mosaic pattern product, and plastic wastes are not produced thereof. Heat energy in the process of heat compressing the crushed pieces can be smaller compared with the heat energy required in the process of manufacturing uniform molded products by melting all the crushed pieces.

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 resin product having a woody appearance, including recycling, and a product thereof.

[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 molding 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.

Further, with respect to general wood plastics including the above-mentioned technology, materials which are usually incinerated, such as wood scraps and sawdust, can be used as the cellulose material to be contained in the resin. As excellent.

[0004]

However, in general plastic technology, there is a technical difficulty associated with the recycling and reuse of the plastic product once produced. For example, even if a plastic product once produced is simply re-melted and extruded, the quality cannot be maintained above a certain level due to dirt, adhesives, paint, moisture, etc. existing in the recycled material. Because there was.

[0005] On the other hand, on the premise that high quality cannot be expected because of a recycled product, there is also a demand to reduce the manufacturing cost as much as possible. The problem to be solved by the present invention is to provide a recycling system in which, in the manufacturing technology of plastic products, plastic garbage is not generated as much as possible by performing the recycling efficiently, while the manufacturing cost is small.

Here, an object of the present invention is to provide a recycling method for a plastic recycling technique, in which the recycling is efficiently performed so that plastic dust is not generated as much as possible and the production cost is small. To provide. Another object of the invention described in claims 6 to 8 is to provide a recycled product in a plastic recycling technology, in which the recycling is efficiently performed, plastic waste is not generated as much as possible, and the manufacturing cost is small. is there.

Another object of the present invention is to provide a material for recycling, in which, in the technology of recycling plastic, by efficiently performing the recycling, plastic garbage is not generated as much as possible and the production cost can be reduced. It is.

[0008]

SUMMARY OF THE INVENTION The present invention is to achieve the above object. (Claim 1) The invention according to claim 1 is a pulverizing step of pulverizing a plastic once produced using a resin as a base material into pulverized pieces, and a heat compression step of forming a desired shape by thermally compressing the pulverized pieces. And a method for manufacturing a mosaic pattern product.

(Explanation of terms) "Plastic once manufactured using a resin as a base material" refers to not only those which once functioned as molded articles, but also those which have become defective at the time of molding, or those which are born during molding or processing. Including materials. "Resin" includes hard resin, soft resin, for example, vinyl chloride resin, foamed vinyl chloride resin, polyethylene resin, polypropylene resin,
Phenol resin, urethane resin, polyurethane resin, A
BS resin, polystyrene resin and the like.

[0010] The means of "crushing" uses, for example, a hammer mill. The degree of pulverization varies depending on the mosaic pattern product to be manufactured, but is, for example, about several centimeters to several millimeters. In addition,
In the case of a cut end formed by cutting or cutting after molding, a size smaller than a certain size may be directly used without pulverization. In other words, the meaning of "crushed pieces" includes those having a size equal to or less than a certain value in advance,
It is assumed that such a material has undergone a pulverizing process.

(Action) At the time of molding or after molding,
When a plastic product is rejected or discarded, it is first crushed in a crushing step to produce crushed pieces. Then, a desired shape is formed by a heat compression step of thermally compressing the crushed pieces. Then, a mosaic pattern molded product is manufactured. The completed mosaic pattern molded product is made up of mosaic pieces having different shapes and sizes, and can provide a tasteful molded product in which the same product does not exist.

In addition, the mosaic pattern molded article can be efficiently regenerated and does not need to emit plastic dust.
In the step of thermally compressing the crushed pieces, the heat energy required for the production is smaller than in the case where all the crushed pieces are melted to produce a uniform molded product. (Claim 2) The invention according to claim 2 limits the method for producing the woody product according to claim 1, wherein the plastic once produced using a resin as a base material includes wood plastic. Features.

(Explanation of terms) The term "wood plastic" refers to a plastic having a woody feel formed by mixing a resin with a cellulose material. The reason for including "plastic" is
It is not necessary that all of the "plastic once manufactured using a resin as a base material" be wood plastic, and even if a part is wood plastic, it is intended to constitute the invention described in the present claim. is there.

(Action) For example, a mosaic pattern product made of a wooden plastic product and a plastic product which is not a wooden plastic, and crushed and heat-compressed, produces a mosaic piece having a non-uniform shape and size. Mosaic pieces with the presence of the target. Therefore, it is possible to provide a variety of interesting molded products.

A mosaic-patterned product obtained by using only a wooden plastic product as a material, pulverizing the same, and heat-compressing it can provide a quaint molded product as if a wooden piece was used as a mosaic piece. (Claim 3) The invention according to claim 3 limits the method for producing the woody product according to claim 2, wherein the cellulose material contained in the wood plastic is obtained by pulverizing the cellulose material. The method is characterized in that a surface particle having a smaller diameter and harder than the powder particle is fixed on the surface of the particle and processed into a fixed particle.

(Explanation of terms) The cellulosic material used for producing fixed grains is usually natural wood, such as sawdust, but may be rice straw, bacas, or the like. The method of forming “fixed particles by fixing surface particles having a smaller diameter and harder than the particles on the surface of the particles” includes, for example, grinding using a ball mill, and long-time high-speed stirring using a Hensyl mixer. There is. The treatment for removing the fluff of the cellulosic fibers may be performed separately from the fixing of the surface grains.

"Surface grains" include metals and metal compounds such as titanium oxide, ferrite, aluminum, nickel, silver and calcium carbonate, and nonmetals such as ceramics. The proportion of the fixed grains mixed with the resin with respect to the whole is set not to exceed 30% by weight. This is because the fluidity at the time of melting and molding is deteriorated, and there is a case where the molding is hindered. (Claim 4) The invention according to claim 4 limits the method for producing a mosaic pattern product according to claim 1, 2, or 3, and after the pulverization step and before the heat compression step. In addition, the method further includes a re-pulverizing step of classifying the size of the crushed pieces and crushing the crushed pieces having a certain size or more again.

(Explanation of Terms, Function) Classification means may be discrimination classification based on weight other than discrimination classification based on the principle of sieve. Since the classification and the re-crushing are performed, the size of the crushed pieces constituting the mosaic pattern is uniform. Therefore, since the sizes of the mosaic pieces are almost uniform, a preferable appearance can be obtained. In addition, unnecessary thermal energy is not used during the thermal compression, and at the same time, the temperature of each pulverized piece can be almost uniformly increased, so that quality can be easily controlled.

If it is only necessary to produce a mosaic pattern product, the product can be produced without going through this classification step. (Claim 5) The invention according to claim 5 is a method for manufacturing a mosaic pattern product according to claim 1, 2, 3, or 4, wherein after the pulverizing step, heat is applied. Before the compression step, the method includes a step of classifying the size of the crushed pieces and removing a crushed piece having a size equal to or less than a certain size.

(Function) Since too small crushed pieces are removed during the thermal compression, the temperature of each crushed piece can be increased almost uniformly, and the quality can be easily controlled. The size of the crushed pieces may be classified to remove crushed pieces having a certain size or more. In this case, the crushed pieces having a certain size or more may be crushed again.

The crushed pieces having a size equal to or less than a certain value removed in the removing step can be melted and used as a material for extrusion molding. Note that if the crushed pieces are too small for the material of the mosaic pattern product, the thermal energy required for melting is not so large. For example, if the crushed pieces are smaller than the pellets, the heat energy required for producing a molded product can be saved.

If it is only necessary to manufacture a mosaic pattern product, the product can be manufactured without performing the removing step. (Claim 6) The invention according to claim 6, wherein the plastic once produced using the resin as a base material is crushed into crushed pieces, and the crushed pieces are thermally compressed to form a desired shape. It is a patterned product. (Claim 7) The invention according to claim 7 is a limitation of the mosaic pattern product according to claim 6, wherein the plastic once manufactured using a resin as a base material includes wood plastic. . (Claim 8) The invention according to claim 8 is a limitation of the mosaic pattern product according to claim 7, wherein the cellulose material contained in the wood plastic is a surface of powder obtained by pulverizing the cellulose material. In addition, it is characterized in that surface particles smaller in diameter and harder than the powder particles are fixed and processed into fixed particles. (Claim 9) A material of a mosaic pattern product which forms a desired shape by pulverizing a plastic once produced using a resin as a base material into crushed pieces and hot-pressing the plastic, which is once produced using the resin as a base material. Plastic includes wood plastic, and the cellulosic material contained in the wood plastic is fixed to the surface of the granules obtained by pulverizing the cellulosic material, and the surface particles having a smaller diameter than the granules are fixed. It is characterized by being processed.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to embodiments and drawings. The drawing used here is FIG. FIG. 1 is a conceptual diagram showing a recycling system including an embodiment of the present invention. (Preparation of material for molding) First, a new pellet is prepared. The new pellets are pellets obtained by mixing fixed grains formed of a cellulose material with a resin.
The formation of "fixed grains" is based on the PCTJ described in the prior art.
Produced by the technique described in P94 / 00351. That is, the pulverization is performed by fixing a surface particle having a smaller diameter and harder than the particle on the surface of the particle having a higher bulk specific gravity by further pulverizing the pulverized powder obtained by pulverizing the cellulose material.
As the cellulosic material at this time, scraps, sawdust, and the like that are generated when wood is cut or cut for use as a part of a house, furniture, or the like can be used. The production of the pellet is a conventionally known method, for example,
Pigment and fixed particles are mixed and melted in the resin, and the resin is extruded in a string form from a perforated circular nozzle and cut. The resin used here was a vinyl chloride resin or a foamed vinyl chloride resin. When a foamed vinyl chloride resin is used, the foaming rate of the regenerated molded product is lower than that of a new product.

Next, a regenerated pellet is prepared separately from the new pellet. The material of the regenerated pellets is a defective material obtained by extrusion molding, a cut end obtained by cutting or cutting after molding, and a material that can be reused among those discarded after painting or bonding. These are collected and pulverized, and if necessary, re-pulverized after classification and melted to form pellets. The pulverizing means uses, for example, a hammer mill so that the size is about several centimeters to several millimeters. In addition, in the cut end by cutting or cutting after molding, a material having a size equal to or less than a certain size may be directly used as a material of a molded product without being pelletized.

The new pellets and the regenerated pellets are prepared so as to have at least two kinds of colors.
Specifically, a pellet is formed after adding a pigment to one or both of a new pellet and a regenerated pellet. The pigment is selected from inorganic pigments such as iron oxide and carbon black in accordance with the color desired by the final molded article.
Select one or several types to use. (Molding and Subsequent Processing) When pellets can be produced or crushed pieces to be added as they are are prepared, they are melted and extruded to produce wood-like molded articles. Depending on the type of the final product, vacuum molding or compression molding may be performed.

On the other hand, defective pellets produced in the production of pellets, poorly extruded materials in extrusion molding, cut ends produced in cutting / cutting processing, and waste products produced in painting / adhering processing are separated as necessary. It is crushed and pelletized again, or becomes a molding material as it is. Painting·
Waste products generated in the bonding process are separated into non-defective products and non-defective products. Good products can be crushed and immediately pelletized, but the used adhesives and paints may cause harm when producing recycled products. (Recovery and Sorting) Residential waste materials that were once produced and shipped after being discarded, and defective products that cannot be directly reused among the waste products that were produced during painting and bonding, were collected as recovered materials. They are separated into iron, aluminum, wood pieces, plastics, etc. and recycled or discarded.

Among these, plastic is crushed and classified using a hammer mill, for example, to a size of several centimeters to several millimeters.
Products of a certain quality are pelletized again, used as a molding material as they are, or subjected to thermocompression molding to be reprocessed into mosaic molded products before being shipped. If the quality after rework is likely to be low, it is re-formed into a part that cannot be seen directly, for example, a base material.
Here, the reshaped base material generally has a characteristic that the coefficient of thermal expansion is lower than that of a new molded product, and may be suitable for use in a portion where a temperature change is large.

As a means for classification performed in association with the pulverization, various means can be adopted in addition to the size classification using the principle of sieve. The criterion for this classification is appropriately adjusted depending on the desired quality of the product, production convenience, and the like. (Heat Compression) When manufacturing a mosaic-shaped molded product by thermocompression molding, if the size of the mosaic-like grains is to be increased, the standard is increased. If the crushed pieces are too small for the material of the mosaic pattern product, the heat energy required for melting is not so large. In some cases,
Thermal energy required for fabrication can be saved. The completed mosaic pattern molded product is made up of mosaic pieces having different shapes and sizes, and can provide a tasteful molded product in which the same product does not exist. In addition, a mosaic pattern product obtained by using only a wooden plastic product as a material, pulverizing the material, and thermally compressing the product can provide a quaint molded product as if a wooden piece was used as a mosaic piece. Furthermore, wood plastic is PCTJP94 / 0035
If it is produced by the technique described in No. 1, it will be a molded product of a mosaic piece closer to a real wood piece.

When a product in which vinyl chloride is used as the resin is pulverized and hot-pressed to be molded, the desired mosaic-like shape is obtained under the conditions of a temperature of 150 to 200 degrees Celsius and a pressure of 10 kg / cm 2. A molded product was obtained. Depending on conditions such as the type of resin used as the material of the molded article, when vinyl chloride is used as the resin, the temperature may be 100 to 200 degrees Celsius and the pressure may be 5 kg or more / square centimeter. (Others) When extruding a mixture of new pellets and regenerated pellets (or reusable materials), molded products made with a mixing ratio of the new pellets of 90% by weight or more are molded only from the new pellets. A high quality molded product that can hardly be distinguished from the product. When a recycled material is used, the property of the resin is deteriorated.
It is often 0% by weight or less.

Since the classification and the re-grinding are performed as required, the temperatures of the pellets and the crushed pieces can be almost uniformly increased, and the quality can be easily controlled. For example, since the size of the crushed pieces constituting the mosaic pattern are uniform, it is not necessary to use unnecessary heat energy at the time of thermal compression, and it is easy to control the quality. According to the above-described embodiment, there is provided a technique for producing a wood-like product that can maintain a certain level of quality even if it is a recycled product, by minimizing plastic waste by efficiently performing the recycling. I was able to.

[0031]

According to the first to fifth aspects of the present invention, in a plastic recycling technique, a recycling method is provided in which a plastic garbage is not generated as much as possible by efficiently performing the recycling and the production cost is small. We were able to. Further, according to the inventions described in claims 6 to 8, it is possible to provide a recycled product in which the recycling is efficiently performed so that the plastic waste is not generated as much as possible and the production cost can be reduced. did it.

According to the ninth aspect of the present invention, in a plastic recycling technique, a material for recycling can be provided in which the recycling is efficiently performed so that plastic waste is not generated as much as possible and the production cost is small. Was completed.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a recycling system including an embodiment of the present invention.

Claims (9)

[Claims] The method includes a pulverizing step of pulverizing a plastic once manufactured using a resin as a base material into pulverized pieces, and a heat compression step of forming a desired shape by heat-compressing the pulverized pieces. Manufacturing method of mosaic pattern products. 2. The method for producing a wood-like product according to claim 1, wherein the plastic once produced using a resin as a base material includes wood plastic. 3. The cellulosic material contained in the wood plaque is obtained by fixing a surface particle having a smaller diameter and a harder surface to the surface of a particle obtained by pulverizing the cellulosic material to form a fixed particle. 3. The method for producing a wood-like product according to claim 2, wherein: 4. The method according to claim 1, further comprising the step of classifying the size of the crushed pieces after the crushing step and before the heat compression step, and crushing the crushed pieces having a certain size or more again. Item 1,
A method for producing a mosaic pattern product according to claim 2 or 3. 5. The method according to claim 1, further comprising the step of classifying the size of the crushed pieces and removing the crushed pieces having a size equal to or less than a predetermined size after the crushing step and before the heat compression step. The method for producing a mosaic pattern product according to any one of claims 2, 3, and 4. 6. A mosaic pattern product wherein a plastic once produced using a resin as a base material is crushed into crushed pieces, and the crushed pieces are heat-compressed to form a desired shape. 7. The mosaic pattern product according to claim 6, wherein the plastic once manufactured using the resin as a base material includes wood plastic. 8. The cellulosic material contained in the wood plaque is obtained by fixing a surface particle having a smaller diameter and a harder surface to the surface of a particle obtained by pulverizing the cellulosic material to form a fixed particle. The mosaic pattern product according to claim 7, wherein the product is provided. 9. A material for a mosaic-patterned product which forms a desired shape by pulverizing a plastic once manufactured using a resin as a base material into crushed pieces and heat-compressing the plastic, and once manufactured using the resin as a base material. Plastic includes wood plastic, and the cellulosic material contained in the wood plastic is fixed to the surface of the granules obtained by pulverizing the cellulosic material, and the surface particles having a smaller diameter than the granules are fixed. Material of mosaic pattern product characterized by being processed.