JP3712493B2 - Resin molding apparatus and resin molding method - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention method the resin molding apparatus and a resin molding, and more particularly, in a so-called tree plug containing the wood flour and pigments relates to a technique for molding so as not significantly reduce the strength with exhibits a clear surface pattern.
[0002]
[Prior art]
A technique for producing a molded product that exhibits a color pattern by mixing a pigment into a resin has been known for a long time. Among them, a representative technique is a technique for producing so-called wood plastic by mixing natural cellulose powder (wood powder) with resin, and various techniques have been provided. Among them, the technology of “cellulosic fine particles, wood-like molded article and wood-like product” described in PCT JP94 / 00351 (International Publication Number: WO94 / 20280) will be briefly described.
[0003]
The ground powder obtained by pulverizing the cellulose material as a raw material is ground to increase the bulk specific gravity, and the outer peripheral surface of the powder is fixed with a surface grain smaller in diameter and harder than the powder. Then, the fixed particles are mixed with a resin and a pigment and melted, and thereafter or simultaneously with melting, they are molded into a desired shape by extrusion molding or injection molding.
According to this technique, it is possible to provide a method for producing a wood-like product and a wood-like product having a pattern very close to the grain of natural wood on the surface and having a texture such as a touch feeling close to that of natural wood.
[0004]
[Problems to be solved by the invention]
By the way, it is not limited to the above-described technique. In the molding of a wood plastic containing a pigment in the molding material, when the kneading with the resin is not sufficient, a clear grain is produced, but as a result, the strength of the molded product is increased. Often decreases.
On the other hand, when the pigment and the resin are sufficiently kneaded, no clear grain is produced. That is, there is a problem that it is difficult to achieve both a clear grain and the strength of the molded product.
[0005]
In order to increase the strength, it is a means to lengthen the kneading time of the molding material or to reduce the pigment content.
The problem to be solved by the present invention is to provide a molding technique capable of producing a pattern with a clear ratio without significantly reducing the strength.
[0006]
The object of the present invention is to provide a molding apparatus capable of producing a pattern with a clear ratio without significantly reducing the strength of a wood plastic molded product.
Another object of the present invention is to provide a molding method capable of producing a pattern with a clear ratio without significantly reducing the strength of a wood plastic molded product.
[0007]
[Means for Solving the Problems]
The present invention is for achieving the above-described object.
(Claim 1)
The invention according to claim 1 is a resin molding apparatus for extruding and molding a kneaded resin material. A patterning device (20) for applying a surface pattern on a molding dough (10) extruded from a mold (30). The patterning device (20) is fixedly installed without moving with respect to the mold (30), and the direction in which the molding dough is extruded on the surface of the molding dough (10) where the surface pattern is to be applied. A plurality of rod-shaped biting projections (21) that bite continuously along the direction of the molding dough (10) are provided at a predetermined interval in a direction perpendicular to the extrusion direction of the shaped dough (10).
[0008]
The patterning device (20) does not move relative to the mold (30). Therefore, the patterning device (30) and the molding dough (10) extruded from the mold (30) move relatively.
(Glossary)
Here, the “resin material” is a material used when a resin molded product is produced. Even if it is only the resin used as the base material, it is a resin material. However, if wood resin (cellulose material) is included in the resin, it becomes a resin material used for so-called wood plastic molding. It is the meaning also including what is limited in Claim 5.
[0009]
The “bite protrusion (21)” includes, in addition to a rod-like one, a plate-like one having an extrusion direction as a flat plate surface.
(Function)
According to the resin molding apparatus according to the first aspect of the invention, the following operation is performed.
The resin material is sufficiently kneaded in the cylinder of the extruder by means such as increasing the rotation speed of the screw or taking sufficient rotation time.
[0010]
The sufficiently kneaded resin material is extruded from the mold (30) to form a molded dough (10). A pattern that intersects the extrusion direction (hereinafter referred to as “vertical stripe pattern”) emerges on the surface of the molded fabric (10) at regular intervals. A plurality of biting protrusions (21) of the patterning device (20) bite into the surface of the molding dough (10) where the surface pattern is to be applied. Since the molding dough (10) is pushed out one after another, the surface of the forming dough (10) where the biting protrusion (21) bites moves, the vertical stripe pattern is forcibly broken, and intersects with the vertical stripe pattern It is drawn so as to have a pattern (hereinafter referred to as “horizontal stripe pattern”).
[0011]
In the meantime, the bite of the biting convex part (21) is released, and if the interval between the plural biting convex parts (21) provided in the horizontal stripe pattern formed here is wide or the extrusion speed is a certain speed, the traces that have been separated For example, a pattern that is close to a plate pattern remains.
According to the resin molding apparatus according to the first aspect of the present invention, the resin can be sufficiently kneaded because it does not rely on the pigment to give the grain pattern. Although the contrast of the color pattern is lowered due to sufficient kneading, a pattern with a clear ratio can be obtained without significantly reducing the strength.
(Claim 2)
The resin molding device according to claim 2 limits the resin molding device according to claim 1, and the interval between the plurality of biting projections (21) is 15 millimeters or less in a direction perpendicular to the extrusion direction. It is characterized by that.
[0012]
According to the resin molding apparatus of the second aspect, since the interval between the plurality of biting projections (21) is narrow, the adjacent traces due to the biting projections (21) are difficult to cross each other. Therefore, a pattern close to a so-called regular pattern can be produced. The reason why it is set to 15 mm or less is that, for example, a grain pattern may be formed at about 20 mm.
(Claim 3)
According to a third aspect of the present invention, there is provided a resin molding method for extruding and molding a kneaded resin material, and a bar-shaped biting convex portion (21 for applying a surface pattern on a molding dough (10) extruded from a mold (30). ) Are provided at predetermined intervals in a direction perpendicular to the extrusion direction, and a patterning device (20) is provided that is fixedly installed without moving with respect to the mold (30). 30) characterized in that it includes a patterning step of continuously biting a plurality of biting convex portions (21) along the extrusion direction of the molding dough on the surface of the molding dough (10) extruded from 30). And
[0013]
Since the patterning step is included, the resin material can be sufficiently kneaded. Therefore, a pattern with a clear ratio can be produced without significantly reducing the strength.
(Claim 4)
The invention described in claim 4 is a resin molding method in which the invention described in claim 3 is technically limited, and the interval between the plurality of biting protrusions is 15 mm or less in a direction perpendicular to the extrusion direction. It is characterized by.
(Claim 5)
Invention of Claim 5 is the resin molding method which technically limited invention of Claim 3 or Claim 4, and the resin material grind | pulverizes the pulverized powder obtained by grind | pulverizing a cellulose material. A powder particle with an increased bulk specific gravity, and a fixed particle by fixing a surface particle smaller in diameter and harder than the powder particle on the outer peripheral surface of the particle, and the fixed particle mixed with a resin as a base material It is characterized by that.
[0014]
(Glossary)
The cellulosic material used to produce the fixed grains is usually natural wood, such as sawdust, but may be rice straw, bacus or the like. The method of forming “fixed grains by fixing surface grains smaller in diameter and harder than the grains on the surface of the grains” is, for example, grinding with a ball mill and high-speed agitation using a high-speed rotary blade mixer for a long time. There are methods.
[0015]
“Surface grains” are metals, metal compounds such as titanium oxide, aluminum, nickel, silver, calcium carbonate, and nonmetals such as ferrite, ceramic, thermosetting resin, and the like. The proportion of the fixed grains mixed with the resin is usually not more than 30% by weight. This is because the fluidity at the time of melting and molding deteriorates, which may hinder molding.
[0016]
The “material obtained by mixing fixed grains with resin” as a resin material may be in the form of a powder or may be pre-molded into a pellet. In order to produce a woodgrain pattern, one type of pigment may be used, but a plurality of types are often used. Since a plurality of types of pigments are used, it is possible to prepare a plurality of types of pellets obtained by differentiating pigments in “mixed resin and pigment in fixed grains”, and use them as “resin material” for mixing them.
[0017]
Since the wood powder in the resin material is a fixed grain, it is possible to produce a wood-like product having a pattern very close to the surface of a natural wood and having a texture such as a touch feeling close to that of a natural wood.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail based on embodiments and drawings. The drawings used here are FIGS. 1 and 2.
FIG. 1 is a perspective view showing a first embodiment of the present invention. FIG. 2 is a perspective view showing a second embodiment of the present invention.
(First embodiment)
The first embodiment is a resin molding apparatus for extruding and molding a kneaded resin material, and includes a patterning device 20 for applying a surface pattern on a molding dough 10 extruded from a mold 30, and the patterning device. No. 20 has nine biting protrusions 21 that continuously bite in the extrusion direction of the molding dough 10 on the surface of the molding dough 10 on which the surface pattern is to be applied. The biting convex portion 21 has a rod shape, and the interval is 10 millimeters in a direction perpendicular to the extrusion direction.
[0019]
The patterning device 20 is fixed to the resin molding apparatus so as not to move with respect to the mold 30. Therefore, the patterning device 30 and the molding dough (10) extruded from the mold 30 move relatively.
The “resin material” is a granulated powder obtained by crushing a pulverized powder obtained by pulverizing a cellulose material to increase the bulk specific gravity. On the outer peripheral surface of this granular particle, a surface particle having a smaller diameter and harder than the granular powder Was fixed to form fixed particles, and the fixed particles were mixed with the resin. Furthermore, in addition to the fixed grains, pigments are added to the resin in accordance with the desired shade of the molded product.
[0020]
According to the resin molding apparatus as described above, the following operations are performed.
The resin material is sufficiently kneaded in the cylinder of the extruder by means such as increasing the rotation speed of the screw or taking sufficient rotation time. The sufficiently kneaded resin material is extruded from the mold 30 to become a molded dough 10. A pattern that intersects with the extrusion direction (hereinafter, referred to as “vertical stripe pattern”) emerges on the surface of the molded fabric 10 at regular intervals. A plurality of biting protrusions 21 of the patterning device 20 are biting into the surface of the molding dough 10 where the surface pattern is to be applied.
Since the molding dough 10 is pushed out one after another, the surface of the forming dough 10 that the biting convex portion 21 bites in moves, so that the vertical stripe pattern is forcibly broken and crosses the vertical stripe pattern. Drawn in.
[0021]
Eventually, the biting of the biting convex portion 21 is released and the molding dough 10 returns to the state immediately after being pushed out of the mold 30, but the trace of the biting convex portion 21 remains. The trace becomes a pattern, but the trace is not likely to be a perfect straight line, and it becomes a natural pattern because it is slightly wavy. According to the resin molding apparatus shown in the first embodiment, since the intervals between the plurality of biting convex portions 21 are narrow, adjacent traces due to the biting convex portions 21 are unlikely to cross each other. Therefore, a pattern close to a so-called regular pattern can be produced.
[0022]
In addition, the resin can be sufficiently kneaded because it does not rely on pigments to give the grain pattern. Although the contrast of the color pattern is lowered due to sufficient kneading, a pattern with a clear ratio can be obtained without significantly reducing the strength. In addition, since the wood powder in the resin material is fixed grains, it has a pattern closer to the surface of natural wood than ordinary wood plastic, and the texture such as touch is close to that of natural wood. Can produce products.
(Second embodiment)
The second embodiment is different from the first embodiment in that the interval between the plurality of biting protrusions is set to 20 millimeters in a direction perpendicular to the extrusion direction. Therefore, if the extrusion speed is set to a certain speed, the traces that have been separated approach or are connected. By doing so, it is possible to provide a molded product having a pattern close to a plate pattern.
(variation)
Next, variations of the above-described embodiment will be described.
[0023]
In the embodiment described above, the surface to be patterned is described as only the upper surface. However, in order to pattern another surface, the biting convex portion 21 of the patterning device 20 may be bited into the surface.
In addition, as “resin material containing wood powder”, “pulverized powder obtained by pulverizing cellulose material is ground to increase the bulk specific gravity, and on the outer peripheral surface of the powder, `` Fixed grains are fixed by fixing hard grains with a smaller diameter and harder than this, and this fixed grain is mixed with resin and pigment '', but even when using a mixture of ordinary wood flour and resin, the strength Thus, it is possible to provide a molded product capable of producing a pattern with a clear ratio without significantly lowering.
[0024]
【The invention's effect】
According to the first and second aspects of the present invention, it is possible to provide a molding apparatus capable of producing a pattern with a clear ratio without significantly reducing the strength of the wood plastic molded product.
Moreover, according to the invention of Claim 3 thru | or 5, the shaping | molding method which can take out a pattern with a clear ratio without significantly reducing the intensity | strength of a wood plastic molded product was able to be provided.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a first embodiment of the present invention.
FIG. 2 is a perspective view showing a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Molding | dough, 20 ... Patterning device, 21 ... Biting-in convex part, 30 ... Mold.

Claims (5)

In a resin molding apparatus for extruding the kneaded resin material and molding a wood plastic,
It has a patterning device for applying a surface pattern on the molded fabric extruded from the mold,
The pattern applicator is fixed and installed in a state where it does not move with respect to the mold, and a bar-shaped biting convexity that continuously bites into the surface of the molding dough in the extrusion direction of the molding dough. A resin molding apparatus characterized in that a plurality of sections are provided at predetermined intervals in a direction perpendicular to the extrusion direction of the molding dough.   The resin molding apparatus according to claim 1, wherein an interval between the plurality of biting protrusions is 15 mm or less in a direction perpendicular to the extrusion direction. In the resin molding method of extruding the kneaded resin material and molding the wood plastic,
A plurality of rod-shaped biting protrusions for forming a surface pattern in a molding dough extruded from a mold have a predetermined interval in a direction perpendicular to the extrusion direction, and are fixed and installed without moving relative to the mold. Prepare the patterning device to be
A resin molding method comprising a patterning step of continuously biting a plurality of biting protrusions along a direction of extrusion of a molding dough on a surface of the molding dough extruded from a mold to be provided with a surface pattern.   4. The resin molding method according to claim 3, wherein the interval between the plurality of biting protrusions is 15 mm or less in a direction perpendicular to the extrusion direction.   The resin material is pulverized powder obtained by pulverizing the cellulose material to obtain powder particles with increased bulk specific gravity, and surface particles that are smaller in diameter and harder than the powder particles are fixed to the outer peripheral surface of the powder particles. 5. The resin molding method according to claim 3, wherein the fixed grains are mixed with the resin.

Images