JP3589617B2 - Method of manufacturing wood-like molded products - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for producing a wood-like molded product used for a vehicle interior or a building interior / exterior.
[0002]
[Background technology]
2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Application Laid-Open No. H11-129223, for example, there is known a technique of manufacturing a molded article having a woody state from a pulverized cellulose material and a resin. That is, in this technique, a wood-like molded article having a desired shape such as a plate or a rod is manufactured by mixing a cellulose powder, a resin, a pigment, and the like, and extruding or injection molding the mixed material.
And, as the cellulose material and the resin which are the raw materials of the wood-like molded article, from the viewpoint of resource reuse, the recovered wood member and the recovered resin member obtained by separating from the scraps and waste materials of the collected building members are used. And are used.
[0003]
[Problems to be solved by the invention]
However, the recovered resin member recovered from the building member is, for example, a mixture of various resins such as vinyl chloride resin, foamed vinyl chloride resin, polyethylene resin, polypropylene resin, and polyurethane resin. In the case of producing a wood-like molded product, a large amount of cellulose material particles (recovered wood members) cannot be contained. Therefore, since a large amount of waste materials cannot be reused at a time, the recycling rate has been slow. Also, in the process of manufacturing a wood-like molded product, calcium carbonate or a pigment for preventing expansion and contraction due to a temperature change of the resin, etc., must be added according to the properties, color, etc. of the recovered resin member. There is also a problem.
[0004]
An object of the present invention is to provide a method for producing a wood-like molded product having a high recycling rate of wood as house waste.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the invention according to claim 1 is a method for producing a wood-like molded product used for the interior of a vehicle or the interior and exterior of a building,
After mixing wood, which is house waste, and a resin packaging member used for food packaging, etc., coarsely crushing by mechanical impact crushing, and then finely crushing by a ball mill ,
After kneading the wood powder obtained by crushing the wood and the resin powder obtained by crushing the resin packaging member, a step of performing extrusion molding,
It is characterized by having.
[0006]
Here, the resin packaging member is, for example, a container (including a container), a tray, or the like formed of polypropylene (PP), polyethylene terephthalate (PET), polystyrene (PS), polyvinyl chloride (PV), or the like. , Sheet-like ones.
[0007]
According to the first aspect of the present invention, a wood-like molded product is formed by using wood powder obtained by pulverizing wood, which is house waste, and resin powder obtained by pulverizing a resin packaging member used for food packaging and the like. Effective use of resources can be achieved.
In addition, since resin packaging members having the same composition are often collected together, the properties and the like are easy to understand and easy to reuse. In addition, additives such as pigments contained in the resin packaging member can be effectively reused, and it is not necessary to add them again at the stage of manufacturing a wood-like molded article, or the amount of addition can be reduced. .
[0008]
According to a second aspect of the present invention, there is provided a method for producing a woody molded article according to the first aspect,
Using a polypropylene packaging member as the resin packaging member,
It is characterized in that the wood flour is contained in an amount of 30 to 65 wt%.
[0009]
According to the second aspect of the present invention, it is possible to use a polypropylene packaging member as a resin packaging member for obtaining a resin powder and to include 30 to 65% by weight of the wood powder, so that the wood-like molded article can contain a large amount of the wood powder. As a result, it is possible to provide a closer feel and texture to real wood, and to use a larger amount of wood, thereby improving the recycling rate of house waste. In the case of a wood-like molded product containing wood flour, if polypropylene is used as the main resin, a molded product having no practical problem can be obtained even if the wood flour is added up to 65 wt%.
[0010]
According to a third aspect of the present invention, in the method for producing a woody molded product according to the second aspect,
The extrusion molding is performed at 180 to 200 ° C.
[0011]
According to the third aspect of the present invention, the wood powder and the resin powder from the polypropylene packaging member are extruded at 180 to 200 ° C. Polypropylene is insufficiently softened at 180 ° C or lower, does not mix evenly with wood flour, and is difficult to extrude. If the temperature is higher than 200 ° C., the wood powder is changed by heat. Therefore, formation can be suitably performed at 180 to 200 ° C.
[0012]
According to a fourth aspect of the present invention, there is provided a method for producing a woody molded article according to the first , second or third aspect,
After the extrusion, the surface is subjected to a sanding treatment,
It is further characterized by performing a coating process.
[0013]
According to the invention as set forth in claim 4, by performing the sanding treatment after the extrusion, the amount of the wood powder exposed on the surface of the wood-like molded product can be increased, and furthermore, the touch of real wood can be brought closer. Can be. In addition, by performing painting after the sanding process, it becomes possible to visually approximate real wood.
[0014]
According to a fifth aspect of the present invention, there is provided a method for producing a woody molded article according to the first , second, third or fourth aspect,
It is characterized in that calcium carbonate previously contained in a resin packaging member is used as a shape stabilizer.
[0015]
According to the fifth aspect of the present invention, calcium carbonate is added as a shape stabilizer during the molding of the resin packaging member. Therefore, by using this calcium carbonate, calcium carbonate is newly added as a shape stabilizer. This can be omitted or the amount of addition can be reduced when adding new calcium carbonate.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail.
The wood-like molded product can be formed by mixing wood fine powder (wood flour) and resin powder, and melting and molding the mixed material. Hereinafter, a method for producing a woody molding will be described.
[0017]
First, using an impeller mill (IMP-250; manufactured by Seishin Enterprise Co., Ltd.), wood, which is house waste material, is pulverized by mechanical impact crushing to have a mesh size of 150 mesh, preferably smaller than 120 mesh. To make a coarsely ground product. Here, the wood of the house scraps includes wood scraps and sawdust that are generated during house building.
Then, a roughly pulverized wood material and zirconia-based and alumina-based ceramic balls having an outer diameter of 3 to 5 mm are loaded into a ball mill body, and these are stirred by a rotor. The coarsely pulverized wood contacting the ceramic balls to be stirred is pulverized into finely pulverized wood, and the surface thereof is polished into fine powder having a surface with very few cilia. At this time, the surface temperature of the ceramic ball is set in the range of 90 to 120 ° C., and the room temperature is set to 80 ° C. or less.
[0018]
That is, when the coarsely crushed wood comes into contact with the surface of the ceramic ball, it is mechanically crushed and abraded to be crushed and polished, and simultaneously heated and dried, so that the water content is efficiently removed. In addition, when separated from the ceramic balls, the fibers are rapidly cooled, so that the fibers in the coarsely pulverized wood are subjected to expansion and contraction and are rapidly dried by being repeatedly subjected to heating and cooling. Is efficiently ground by the ceramic ball, and as a result, finely ground wood particles (wood flour) having a small cilia on the peripheral surface and having an independent particle size can be obtained.
[0019]
The wood fine particles thus obtained are classified and adjusted to a desired particle size, and the wood fine particles and a hard white pigment (surface particles) smaller in diameter and harder than the wood fine particles are placed in a ball mill. While mixing and dispersing the obtained mixed particles in a gas phase, mechanical thermal energy mainly including impact force is applied to the particles, and wood fine particles are used as base particles, and a white pigment is applied to the outer peripheral surface of the base particles. The particles are carried to form wood fine particles with surface particles.
[0020]
Here, as the white pigment to be supported, titanium oxide, lithopone, white carbon, and the like can be used. In particular, titanium oxide is thermally and chemically stable, and has excellent coloring power and excellent hiding power. Therefore, it is preferable because sufficient whiteness can be imparted to the obtained wood-like molded product. The particle size of the white inorganic pigment is adjusted to be sufficiently smaller than the wood fine particles, and specifically, a particle size of about 0.1 μm is preferable.
In addition, the amount of the white pigment to be supported is such that the upper limit is the amount that overlaps the peripheral surface of the wood fine particles serving as the base particles and covers the peripheral surface, and the lower limit depends on the desired hue of the wood-like molded article to be created. Determine as appropriate.
[0021]
A resin powder is mixed with the fine wood particles having surface particles obtained as described above to obtain a mixed material.
Resin powder mixed with fine wood particles with surface particles is used for packaging foods, etc., and is used to collect trays, polypropylene packaging materials such as food containers, and polypropylene scraps produced when forming polypropylene packaging materials Is crushed. The composition of the polypropylene packaging member is mainly 75% polypropylene, 20% talc, and 5% calcium carbonate. Here, calcium carbonate is added to prevent expansion and contraction of the polypropylene packaging member due to a temperature change or the like and to stabilize the shape.
The mixing ratio of the wood fine powder and the polypropylene packaging member powder is such that the wood fine powder is 30 to 65 wt% (preferably 51 to 55 wt%) and the resin powder is 20 to 45 wt% (preferably 25 to 30 wt%).
Here, if the amount of the fine wood particles is less than 30 wt%, it is insufficient to produce wood, and waste wood cannot be effectively reused. Further, since a wood-like molded product can be formed without any problem up to 65 wt%, it is appropriate to add wood fine particles so as to be 30 to 65 wt%. The addition amount of the resin powder is determined according to the addition amount of the wood fine powder. When the additive is added, the total amount of the wood fine powder, the resin powder, and the additive is 100 wt%. To be added.
[0022]
This mixed material is once melted and extruded to form wood-like forming material pellets. Further, the wood-like forming material pellets are melted at 180 to 200 ° C. and extruded to form a wood-like molded product having an actually desired shape.
If the extrusion temperature is 180 ° C or lower, the softening of the polypropylene is insufficient, and if it is 200 ° C or higher, the timber fine particles change, so 180 to 200 ° C is appropriate.
[0023]
Then, surface treatment is performed on the wood-like molded product by sanding and painting.
After the surface is polished with coarse sandpaper, the surface is polished with fine sandpaper. That is, the fine wood particles are exposed to the surface of the wood-like molded article with coarse sandpaper, and the surface of the wood-like molded article is smoothed with fine sandpaper.
After this sanding treatment, the surface of the wood-like molded product is coated to form a wood-like molded product having a desired hue.
[0024]
The mixing of wood and resin may be performed before pulverization. That is, uncrushed wood and a polypropylene packaging member are mixed so that the wood becomes 30 to 65 wt% and the polypropylene packaging member becomes 20 to 45 wt%, and the mixture is made of wood as in the above-described method. It is pulverized until it becomes fine powder and the polypropylene packaging member becomes powdery. Titanium oxide is mixed with the pulverized mixture and supported on fine wood particles, and then the mixture is melted to synthesize wood-like forming material pellets.
The method of forming the wood-like molded article from the wood-like forming material pellets is the same as the method described above.
[0025]
As described above, according to the above-described embodiment, a wood-like molded product is manufactured using wood, which is house waste, and a polypropylene packaging member used for food packaging or the like as raw materials, so that resources can be reused.
In addition, food packaging members often have the same composition and are collectively collected, and can be easily reused taking advantage of their properties. That is, since polypropylene can be consolidated even if it contains many wood fine particles (wood powder), the amount of wood fine particles (wood powder) in the wood-like molded article can be reduced to 30 to 65 wt% by using the polypropylene packaging member. can do. As a result, the feel and texture of the wood-like molded product can be made closer to real wood, a large amount of house waste can be used, and the wood recycling rate can be improved.
Also, in order to stabilize the shape of the packaging member, about 5% of calcium carbonate is added in advance to the polypropylene packaging member. No need to add. Further, since this calcium carbonate also plays a role as a white pigment, the amount of added titanium oxide, which is a white pigment, can be reduced.
After extruding a wood-like molded product, sanding is performed to remove the resin (polypropylene) on the surface, and the fine wood particles (wood flour) are exposed on the surface, so that the feel is closer to that of real wood. And it can be visually approximated to real wood by painting.
[0026]
In the above embodiment, sandpaper is used for the sanding treatment. However, the present invention is not limited to this, as long as it can scrape the resin on the surface of the wood-like molded product. And so on.
The method of crushing wood or resin, the crushing device, and the like are also arbitrary, and it goes without saying that the specific detailed structure and the like can be appropriately changed.
[0027]
【The invention's effect】
According to the first aspect of the present invention, since the wood-like molded article is manufactured using the wood as the house waste material and the resin packaging member used for food packaging and the like as raw materials, resources can be effectively used.
In addition, since resin packaging members are often collectively collected with the same composition, their properties and the like are easy to understand and reuse, and the additives contained in the resin packaging member must be effectively reused. Therefore, there is no need to add it again at the stage of manufacturing the wood-like molded article.
[0028]
According to the second aspect of the present invention, the amount of wood powder contained in the wood-like molded article increases by incorporating 30 to 65 wt% of wood powder using the polypropylene packaging member. As a result, the feel and texture of the wood-like molded product can be made closer to real wood, and the amount of house waste recycled can be increased.
[0029]
According to the third aspect of the present invention, when the temperature is 180 ° C. or less, the softening of the polypropylene is insufficient, so that it is difficult to perform extrusion forming and uniform mixing with the wood flour. I will. Therefore, by extruding at 180 to 200 ° C., a wood-like molded product can be suitably formed.
[0030]
According to the fourth aspect of the present invention, by sanding the surface of the extruded wood-like molded product, the amount of wood powder exposed on the surface is increased, and the feel of real wood can be made closer to the touch. In addition, by painting the surface after the sanding treatment, it can be visually made closer to real wood.
[0031]
According to the fifth aspect of the present invention, by using the resin packaging member, calcium carbonate contained as a shape stabilizer in the resin packaging member can be used as a shape agent for a wood-like molded product. It is not necessary to add calcium carbonate, or the amount of addition can be reduced.

Claims (5)

A method for producing a wood-like molded article used for the interior of a vehicle or the interior and exterior of a building,
After mixing wood, which is house waste, and a resin packaging member used for food packaging, etc., coarsely crushing by mechanical impact crushing, and then finely crushing by a ball mill ,
After kneading the wood powder obtained by crushing the wood and the resin powder obtained by crushing the resin packaging member, a step of performing extrusion molding,
A method for producing a wood-like molded product, comprising: The method for producing a wood-like molded product according to claim 1,
Using a polypropylene packaging member as the resin packaging member,
A method for producing a wood-like molded product, wherein the wood flour is contained in an amount of 30 to 65 wt%. The method for producing a woody molded product according to claim 2,
The method for producing a wood-like molded product, wherein the extrusion molding is performed at 180 to 200 ° C. The method for producing a wood-like molded product according to claim 1, 2, or 3,
After the extrusion, the surface is subjected to a sanding treatment,
A method for producing a wood-like molded product, further comprising performing a coating treatment. The method for producing a wood-like molded product according to claim 1, 2, 3, or 4,
A method for producing a wood-like molded product, wherein calcium carbonate previously contained in a resin packaging member is used as a shape stabilizer.