JP2000334808A - Production of extrusion-molded composite resin molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a method for producing an extrusion-molded composite resin molding which can provide the molding having a soft woody feel created by a vegetable filler and surface properties relatively easily. SOLUTION: In a method in which when a composite resin composition containing a thermoplastic resin and a vegetable filler is extrusion-molded, the composition is extrusion-molded by an extrusion molding apparatus 6 in which next to an extruder 1, a heating molding mold 2 and a cooling molding mold 3 are fitted directly in this order, an extrusion-molded composite resin molding 8 is produced by a process in which between the molds 2, 3, for example, in a molding part, by a molding plate 4 in whicn projected parts or recessed parts corresponding to uneven stripes are formed in the thickness direction of a molded body, uneven stripes are formed in the extrusion direction on the surface of the molded body, and the molding 8 is extrusion-molded by an extrusion molding apparatus in which when the composition is extrusion-molded, the mold 2, the mold 3, and for example, a surface heating mold having a rough inner surface are arranged directly in this order.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a method for producing a composite resin extruded product which can provide a relatively simple extruded product having a soft woody texture derived from a plant-based filler or surface properties. About.

[0002]

2. Description of the Related Art Conventionally, various attempts have been made to obtain a molded article having a woody feel by extrusion molding a composite resin composition in which a plant-based filler such as wood powder is mixed into a thermoplastic resin. However, since the surface of the molded article has a high resin content, gloss peculiar to plastic remains, and it has been practically difficult to easily obtain a molded article having a sufficient woody feeling. Therefore, for example, the surface of a wooden synthetic board formed by a thermoplastic resin and a cellulose-based filler is subjected to a grinding process with a sander to form a number of scratches, and then a colorant is applied to the surface, and finally, There has been proposed a method of forming a pattern such as a grain close to a natural tree by printing a grain pattern (see Japanese Patent Application Laid-Open No. 9-216500).

According to this method, the printing ink impregnates the wood powder on the surface and penetrates into the deep part of the wound, so that the ink bleeds, so that a woody grain pattern can be obtained. Such an effect is certainly preferable. However, this method includes a first grinding step for forming a large number of scratches, a colorant application step, a second grinding step requiring grinding and polishing while leaving the concave coloring layer, and a step of printing a wood grain pattern on the polished surface. It requires complicated and large-scale equipment in order to be practically employed industrially, and it is said that a method capable of easily obtaining a molded article having a woody feeling is simple. It was difficult.

On the other hand, a method of obtaining a wood grain pattern by giving irregularities to the surface of a composite resin molded product of a thermoplastic resin and wood flour has been known for a long time. For example, Japanese Patent Application Laid-Open No. Sho 62-117724 discloses a method. When extruding a composite resin composition containing wood powder as desired in an expandable thermoplastic resin, by using an extruder provided with grooves in the flow direction on the inner periphery of the mouthpiece, a straight grain similar to natural wood It is disclosed to obtain a shaped body having a pattern.

[0005]

However, according to the study of the present inventors, the method described in Japanese Patent Application Laid-Open No. Sho 62-117724 can provide a straight line in the resin extrusion direction. However, a straight line composed of irregularities has a different taste from a straight-grained pattern similar to a natural tree, and a molded article more similar to a straight-grained natural wood having a subtle fluctuation has been desired.

The present invention has been made in view of the above-mentioned problems in the conventional method for producing a composite resin molded article having a woody feel, and provides a soft woody feel derived from plant-based fillers and surface properties. It is an object of the present invention to provide a method for producing a composite resin extruded product that can provide the extruded product presented relatively easily.

[0007]

Means for Solving the Problems In order to achieve the above object, the present invention according to claim 1 provides a method for extruding a composite resin composition containing a thermoplastic resin and a plant-based filler.
Next to the extruder, a heating shaping mold and a cooling shaping mold are a method of extruding by an extrusion molding apparatus which is directly attached in this order, and between the heating shaping mold and the cooling shaping mold, Provided is a method for producing a composite resin extruded product, characterized in that a plurality of irregularities are provided on the surface of a shaped object along the extrusion direction.

According to a second aspect of the present invention, a plurality of irregularities having fluctuations are provided along the extrusion direction of the surface of the shaped body at the resin outlet of the heated shaping mold. 2. A composite resin extruded body according to claim 1, wherein the extruded body is formed by a shaping plate having a plurality of projections or recesses corresponding to the plurality of projections and depressions in a thickness direction of the shaping body. Provide a way.

Further, the present invention according to claim 3 is a method for extruding a composite resin composition containing a thermoplastic resin and a plant-based filler, in which a heating shaping mold, a cooling shaping mold and a surface heating mold are used. Are extruded by an extruder directly attached in this order. According to a fourth aspect of the present invention, there is provided the composite resin extruded product according to the third aspect, wherein the surface heating mold has a surface heating mold having a rough inner surface. And a method for producing the same.

According to a fifth aspect of the present invention, the composite resin composition comprises 100 to 400 parts by weight of a plant filler and 100 to 400 parts by weight of an α, β-unsaturated carboxylic acid based on 100 parts by weight of the thermoplastic resin. The method for producing a composite resin extruded product according to any one of claims 1 to 4, comprising 1 to 40 parts by weight of a monomer and a polymerization initiator.

Hereinafter, the present invention will be described in more detail. In the present invention, as the thermoplastic resin used in the composite resin composition, polyethylene, polyolefin such as polypropylene, polyamide, polyacetal, polyethylene terephthalate, polybutylene terephthalate, fluororesin, polyphenylene sulfide, polystyrene,
Commercially available thermoplastic resins such as ABS, acrylic resin, polycarbonate, polyurethane, polyvinyl chloride, polyphenylene oxide, and ethylene-vinyl acetate copolymer are exemplified. In addition, the average particle size of the thermoplastic resin can be used that can pass through the clearance of the extruder,
If it is too fine, kneading becomes difficult, so
About 0 μm is preferable.

The type of the plant-based filler used in the present invention is particularly limited as long as the obtained molded article has a plant-like appearance and gives a soft touch, and is a plant-based filler. Not limited to, for example, wood chips such as wood, wood board, plywood, pulp, bamboo, etc., cutting chips, abrasive chips, cutting saw chips, crushed materials; grain or fruit husks such as rice hulls, walnut husks or crushed thereof Objects and the like.

[0013] Further, generally, plant-based fillers, such as wood flour, contain moisture, which affects the surface properties of molded articles.
When the extrusion temperature is 150 ° C or higher, the water content in the plant-based filler is desirably 10% by weight or less, and when the extrusion temperature is 120 to 150 ° C, the water content is desirably 20% by weight or less. . The blending amount of the plant-based filler is technically possible up to 50 to 500 parts by weight based on 100 parts by weight of the thermoplastic resin. Parts by weight are preferred.

When the above-mentioned composite resin composition is mixed with an α, β-unsaturated carboxylic acid monomer and a polymerization initiator as shown below, the α, β-unsaturated carboxylic acid monomer is converted into a thermoplastic resin. And the polymerization initiator is monomer-polymerized after plasticization to provide a molded article having higher physical properties.

The α, β-unsaturated carboxylic acid monomer used in the present invention includes α, β-unsaturated carboxylic acid,
α, β-unsaturated carboxylic acid esters and α, β-unsaturated carboxylic acid amides.
It is above ℃. Α, β-unsaturated carboxylic acid monomers having a boiling point of less than 102 ° C. tend to volatilize during extrusion molding to lower the surface properties of molded articles. As the α, β-unsaturated carboxylic acid-based monomer, it is preferable to select a monomer having a boiling point higher than the extrusion molding temperature.

Specific examples of the α, β-unsaturated carboxylic acid monomer include methacrylic acid, acrylic acid, crotonic acid, isocrotonic acid, and itaconic acid. Is done.

Examples of the methacrylate include ethyl methacrylate, n-butyl methacrylate, i-butyl methacrylate, t-butyl methacrylate, 2-ethylhexyl methacrylate, lauryl methacrylate, tridecyl methacrylate, and methacrylic acid. Stearyl acid, cyclohexyl methacrylate, benzyl methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, dimethylaminoethyl methacrylate, dimethylaminoethyl methacrylate / methyl chloride salt, diethylaminoethyl methacrylate, methacrylic acid Glycidyl, tetrahydrofurfuryl methacrylate, allyl methacrylate, ethylene glycol dimethacrylate, triethylene glycol dimethacrylate, tetraethyl dimethacrylate Glycol, 1,3-butylene glycol dimethacrylate, dimethacrylate -1,
Examples thereof include 6-hexanediol, trimethylolpropane trimethacrylate, and 2-ethoxyethyl methacrylate.

Examples of the acrylate include allyl acrylate, isobutyl acrylate, and acrylic acid-2- (5
-Ethyl-2-pyridyl) ethyl, 2-ethylhexyl acrylate, cyclohexyl acrylate, glycidyl acrylate, 2-cyanoethyl acrylate, 2-hydroxyethyl acrylate, hydroxypropyl acrylate, -n-butyl acrylate , T-butyl acrylate, β-hydroxyethyl acrylate, hydroxypropyl acrylate and the like.

Examples of the α, β-unsaturated carboxylic acid amide include acrylamide and N-methylolacrylamide.

The amount of the α, β-unsaturated carboxylic acid monomer is preferably 1 to 40 parts by weight based on 100 parts by weight of the thermoplastic resin. If the amount is less than 1 part by weight, the thermoplastic resin cannot be sufficiently plasticized, and the thermoplastic resin may not contain the plant-based filler in a high ratio. There is a tendency that the viscosity of the molded product is too low, and the surface property of the molded product is deteriorated. Moreover, you may use together several types of monomers as needed.

The composite resin composition according to the present invention is preferably such that 100 to 400 parts by weight of the plant-based filler, α,
It is preferable to contain 1 to 40 parts by weight of the β-unsaturated carboxylic acid-based monomer and a polymerization initiator from the viewpoints of expressing a woody feeling, a plasticizing effect of the thermoplastic resin, and extrudability. More specifically, the above-mentioned composition allows the α, β-unsaturated carboxylic acid-based monomer to plasticize the thermoplastic resin and to suppress the decomposition of wood flour to highly fill the molded body. A molded body with uniform surface properties is obtained.

The polymerization initiator used in the present invention includes:
Any one can be used as long as it causes polymerization of the α, β-unsaturated carboxylic acid monomer by heating,
Ketone peroxide, peroxyketal, dialkyl peroxide, diacyl peroxide,
Peroxyester-based and peroxydicarbonate-based polymerization initiators are exemplified.

As the polymerization initiator, those having a 10-hour half-life temperature of 60 ° C. or more are more preferable. When the half-life temperature is less than 60 ° C., the acrylate monomer as an α, β-unsaturated carboxylic acid-based monomer is rapidly cured during extrusion molding, and the extrudability may be reduced.

Specific examples of the polymerization initiator are as follows. Examples of the ketone peroxide-based polymerization initiator include methyl acetoacetate peroxide.

Examples of the peroxyketal-based polymerization initiator include 1,1-bis (t-hexylperoxy) -3,
3,5-trimethylcyclohexane (86.7 ° C.),
1,1-bis (t-hexylperoxy) cyclohexane (87.1 ° C.), 1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane (90.
0 ° C), 1,1-bis (t-butylperoxy) cyclohexane (90.7 ° C), 1,1-bis (t-butylperoxy) cyclododecane (95.0 ° C), 2,2-bis (T-butylperoxy) butane (103.1 ° C.),
n-butyl-4,4-bis (t-butylperoxy) valerate (104.5 ° C.), 2,2-bis (4,4-di-t-butylperoxycyclohexyl) propane (9
4.7 ° C.).

As a dialkyl peroxide-based polymerization initiator, di-t-butyl peroxide (123.7 ° C.)
And the like.

As diacyl peroxide-based polymerization initiators, lauroyl peroxide (61.6 ° C.), stearoyl peroxide (62.4 ° C.), 2,4-dichlorobenzoyl peroxide (52.8 ° C.), octanoyl peroxide Oxide (61.5 ° C.), benzoyl peroxide (73.6 ° C.) and the like.

As the peroxyester polymerization initiator,
1,1,3,3-tetramethylbutylperoxy-2-
Ethyl hexanoate (65.3 ° C), 2,5-dimethyl-2,5-bis (2-ethylhexanoylperoxy) hexane (66.2 ° C), 1-cyclohexyl-1
-Methylethylperoxy-2-ethylhexanoate (67.5 ° C), t-hexylperoxy-2-ethylhexanoate (69.9 ° C), t-butylperoxy-2-ethylhexanoate (72.1 ° C.), t-butyl peroxyisobutyrate (77.3 ° C.), t-hexyl peroxyisopropyl monocarbonate (95.
0 ° C.), t-butylperoxymaleic acid (96.1)
° C), t-butylperoxy-3,5,5-trimethylhexanoate (97.1 ° C), t-butylperoxylaurate (98.3 ° C), 2,5-dimethyl-2,5
-Di (m-toluoylperoxy) hexane (98.5)
C), t-butyl peroxyisopropyl monocarbonate (98.7C), t-butyl peroxy-2-ethylhexyl monocarbonate (99.0C), t-hexyl peroxybenzoate (99.4C), , 5-
Dimethyl-2,5-di (benzoylperoxy) hexane (99.7 ° C), t-butylperoxyacetate (101.9 ° C), t-butylperoxy-m-toluoylbenzoate, t-butylperoxybenzoate (104.3 ° C), 2,4,4-trimethylpentyl-
2-hydroperoxide and the like. In the above exemplified compounds, the numbers in parentheses indicate the 10-hour half-life temperatures.

In the present invention, as the polymerization initiator, 1
Using a material having a relationship such that the 0-hour half-life temperature is such that the extrusion temperature −70 ° C. <the 10-hour half-life temperature of the polymerization initiator <the extrusion temperature −10 ° C. with respect to the extrusion temperature of the extruder, This is particularly preferable because the speed can be easily controlled.

The combination of the polymerization initiator and the α, β-unsaturated carboxylic acid monomer and the blending ratio of the polymerization initiator are as follows:
Gel time tester under the same temperature conditions as extrusion temperature (“N
o. It is preferable that the gelation time is determined so as to be 30 to 600 seconds by the measurement according to “type 153”, manufactured by Yasuda Seiki Seisakusho).

The composite resin composition of the present invention may contain a known lubricant, if necessary. Examples of the lubricant include hydrocarbon-based (liquid paraffin, natural paraffin, micro wax, polyethylene wax, etc.), fatty acid-based (stearic acid-based, etc.), fatty acid amide-based (stearic amide, palmitic amide, methylene bisstearol). Amides), esters (such as butyl acrylate, hydrogenated castor oil, and ethylene glycol monostearate), alcohols (such as cetyl alcohol and stearyl alcohol), and metal soaps (such as zinc stearate, calcium stearate, and lead stearate). Can be

The lubricant varies depending on the type of resin used.
Those that show strong external lubrication are preferred. The reason is that, in extrusion molding of a thermoplastic composite material that is highly filled with filler, the lower the resistance to the mold during cooling molding, the more significantly the moldability is improved. Examples of the lubricant having strong external lubrication include hydrocarbons, higher fatty acids, and metal soaps. When adding a lubricant, the amount added is 1 to
25 parts by weight are preferred. If the amount is less than 1 part by weight, the effect of the addition will not be clear, and if it exceeds 25 parts by weight, physical properties will be reduced.

The above-mentioned composite resin composition may optionally contain
Further, additives such as a plasticizer, a foaming agent, and the like, a reinforcing material such as glass fiber and carbon fiber, a marble powder, a stone powder, a metal powder, a non-vegetable filler, and the like can be added.

If necessary, known foaming agents such as those described below can be added to the composite resin composition of the present invention, whereby the composition can be foamed while being extruded,
By foaming after molding, it is possible to express a different woody feeling. As foaming agents that can be used,
Inorganic blowing agents such as ammonia carbonate and sodium bicarbonate; dinitrosopentamethylenetetramine, N, N'-dimethyl-
N, N'-dinitrosoterephthalamide, benzenesulfonyl hydrazide, p-toluenesulfonyl hydrazide, P, P'-oxybis (benzenesulfonyl hydrazide), 3,3'-disulfone hydrazide phenyl sulfone, azobisisobutyronitrile, Organic foaming agents such as azodicarbonamide, barium azodicarboxylate, and diethyl azodicarboxylate are exemplified.

As the extruder, any of a single-screw extruder and a twin-screw extruder can be used, but from the viewpoint of kneading properties, a twin-screw extruder, particularly a twin-screw co-directional extruder, is preferred. Preferably it is 120-180 degreeC. If the temperature is lower than 120 ° C., the composite resin composition of the present invention cannot be extruded. If the temperature exceeds 180 ° C., the discoloration of the plant-based filler occurs during the extrusion molding, and the surface property tends to be reduced.

[0036]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for producing a composite resin extruded product of the present invention will be described with reference to the drawings. FIG.
It is a typical side view which shows an example of the extrusion-molding apparatus suitable for use for implementing this invention of Claim 1 or 2. In an extruder 1 such as a twin-screw co-extruder, a heating shaping mold 2 and a cooling shaping mold 3 are directly attached to a downstream end in this order.
Are formed. The heating shaping mold 2 is provided with a shaping plate 4 at its resin outlet so as to maintain direct attachment to the cooling shaping mold 3. In addition, 19 is a hopper.

The shaping plate 4 whose enlarged front view is shown in FIG. 2A and whose enlarged side view is shown in FIG. 2B has a shaping portion so that a plurality of irregularities can be formed on the surface of the shaping body 7. In 411, a plurality of convex portions or concave portions (convex portions in FIG. 2) 412 are formed. In the shaping portion 411, the height h of the portion where the convex portion 412 is not formed is 6 mm, the height of the convex portion 412 extending from above and below is 2.5 mm to 3 mm, and a random interval is provided in the horizontal direction. It is arranged in. In addition, 9 and 9 are mounting holes for mounting to the heating shaping mold 2.

According to the first or second aspect of the present invention, in order to obtain a composite resin extrudate, a composite resin composition containing a thermoplastic resin and a plant-based filler is charged into the hopper 19, and the extruder is extruded. It is preferable to extrude the mold 1 by an extruder 6 in which a heating shaping mold 2 and a cooling shaping mold 3 are directly attached in this order.

At this time, for example, the shaping plate 4
At the outlet of the heating shaping mold, the shaping body 7 is moved along the extrusion direction.
A plurality of irregularities 12 (for example, see FIG. 7) are provided on the surface. In this case, the plurality of irregularities 12 are usually formed as a result by providing a plurality of grooves (recesses) on the surface of the shaped body 7.

FIG. 5 is a schematic side view showing an example of an extrusion molding apparatus suitable for use in the practice of the present invention. An extruder 1 such as a twin-screw co-extruder includes:
At the downstream end, a heating shaping die 2, a cooling shaping die 3, and a surface heating die 5 are directly attached in this order to form an extrusion molding device 10. The surface heating mold 5 removes a skin layer (not shown) on the surface of the extruded body by heating again the extruded shaped body heated and shaped by the heating shaping mold 2 and cooled and solidified by the cooling shaping mold 3. Thus, only the surface is provided with subtle irregularities that can express a woody feeling.

Extruder 1, heating shaping mold 2 and cooling shaping mold 3
With respect to, those similar to those used in the extrusion molding device 6 can be used. As shown in an enlarged front view of FIG. 6, the surface heating mold 5 has a T-shaped cross section of a shaping portion, and has a rough inner surface 51. If the inner surface 5 of the surface heating mold 5 is, for example, plated and has a high surface smoothness, the surface of the shaped body having a high resin content cannot be sufficiently roughened, and a molded body having a woody feeling can be obtained after all. It is not possible.

The surface heating mold 5 having a rough inner surface means that the surface roughness Rmax according to JIS B0601 is preferably 10 μm or more, and usually the Rmax is 1000 μm or less. The surface state is used. If it exceeds 1,000 μm, the surface roughness becomes resistance during extrusion molding, and the extrudability decreases, and it is difficult to obtain a molded article having a good appearance.

(Example 1) FIG. 1 shows 100 parts by weight of a homopolypropylene as a thermoplastic resin, 100 parts by weight of wood flour (average particle size 200 μm) of Yonega and 5 parts by weight of zinc stearate as a plant-based filler. Into the hopper 9 shown
By an extrusion molding device 6 composed of a twin-screw co-extruder 1,
Kneading and simultaneous molding were performed to obtain an extruded body 8. In addition, the exit sectional shape of the heating shaping mold 2 attached to the tip of the extruder 1 is 6 ×
The shape of the shaping plate 4 is shown in FIG.
As in Example 1, an extrusion molding apparatus 6 was used, which was configured by directly attaching a cooling shaping mold (6 × 60 mm). In addition, the temperature of the extruder and the heating shaping mold was 190 ° C., and the temperature of the cooling shaping mold was 90 ° C.
° C.

Example 2 A molded product was obtained in the same manner as in Example 1, except that the shaping plate 42 shown in FIG. 3 was used instead of the shaping plate 41 shown in FIG. Shaping plate 42
In the shaping portion 421, the height of the portion where the convex portion 422 is not formed is 6 mm like the shaping plate 41, and the height of the convex portion 422 extending from above and below is 1 mm. Nine convex portions are arranged at the same intervals. (Example 3) In Example 1, the shaping plate 4 shown in FIG.
A molded product was obtained in the same manner except that the shaping plate 43 shown in FIG. 4 was used instead of 1.

Example 4 In Example 1, 100 parts by weight of homopolypropylene and 300 parts by weight of wood flour (average particle size 200 μm) of Yonetsuga as a plant-based filler were used.
5 parts by weight of cyclohexyl methacrylate monomer as an αβ unsaturated carboxylic acid-based monomer and 0.1 part by weight of 2,4,4 trimethylpentyl 2-hydroperoxide (TMBH manufactured by Kayaku Akzo Co., Ltd.) were added as a polymerization initiator. Except for this, a molded body was obtained in the same manner.

(Comparative Example 1) In Example 1, the heating shaping mold 1 and the shaping plate 41 were directly formed, and the cooling shaping mold was fixed at a distance of 10 mm. It was formed by the take-off force of the take-off machine. * Examples 1 to above
4 and FIGS. 7 to 11 are schematic plan views of the extruded sample obtained in Comparative Example 1. FIG.

Example 5 FIG. 5 shows 100 parts by weight of a homopolypropylene as a thermoplastic resin, 100 parts by weight of wood flour (average particle size: 200 μm) as a plant-based filler, and 5 parts by weight of zinc stearate. Into the hopper 9 shown
Kneading and simultaneous molding were performed by an extruder 10 comprising a twin-screw co-extruder 1 to obtain an extruded body. The exit cross-sectional shape of the heating shaping mold 2 attached to the extruder 1 tip is T
The width of each of the horizontal portion and the vertical portion was 6 mm, and the cross-sectional shapes of the cooling shaping mold 3 and the surface heating mold 5 were the same. However, the inner surface 51 of the surface heating mold 5 has a surface roughness Rmax conforming to JIS B0601 of 3 by polishing.
It was adjusted to 00 μm. The temperature of the extruder and the heating shaping mold was 190 ° C., the temperature of the cooling shaping mold was 90 ° C., and the temperature of the surface heating mold was 150 ° C. The gloss of the surface of the obtained extruded product was measured by a HORIBA gloss meter, and was 9%. The extruded product had no gloss and had a sufficient woody feel.

(Example 6) In Example 5, 100 parts by weight of homopolypropylene and 300 parts by weight of wood flour (average particle size: 200 μm) of Yonetsuga as a plant-based filler were used.
5 parts by weight of cyclohexyl methacrylate monomer as an αβ unsaturated carboxylic acid monomer and 0.1 part by weight of 2,4,4 trimethylpentyl 2-hydroperoxide (TMBH, manufactured by Kayaku Akzo Co., Ltd.) were added as a polymerization initiator. Except for this, a molded body was obtained in the same manner. The glossiness of the surface of the obtained extruded product was 3%, and the extruded product did not have so-called luster and had a sufficient woody feel.

(Comparative Example 2) A molded product was obtained in the same manner as in Example 5, except that molding was performed using an extrusion molding apparatus not provided with the surface heating mold 5. Formed by the take-off force of the machine. The glossiness of the surface of the obtained extruded product was 41%, and so-called glossiness was left, and the woodiness was insufficient.

[0050]

According to the first aspect of the present invention, the composite resin composition is extruded by an extruder in which a heating shaping die and a cooling shaping die are directly mounted in this order after the extruder. At the time of extruding, a plurality of irregularities are provided on the surface of the shaped body along the extrusion direction between the heating shaping mold and the cooling shaping mold to directly reproduce the extrusion fluctuation based on the material input to the extruder. It is possible to give subtle and irregular fluctuations to the molded article. That is, to provide a plurality of irregularities on the surface of the shaped body between the heating shaping mold and the cooling shaping mold means that the material is sent forward only by the extrusion thrust of the extruder, or a take-off machine or the like. Therefore, the molding is performed without using equipment for suppressing the extrusion fluctuation, and as a result, a subtle and irregular fluctuation based on the extrusion fluctuation is given. According to the second aspect of the present invention,
The shaping irregularities can be easily provided by a shaping plate in which a plurality of protrusions or recesses corresponding to the plurality of unevennesses are formed in the thickness direction of the shaping body. According to the third aspect of the present invention, when a composite resin composition containing a thermoplastic resin and a plant-based filler is extruded, a heating shaping mold, a cooling shaping mold, and a surface heating mold are directly arranged in this order. Since the extruded shape is extruded by the extruding device attached thereto, the extruded shape that has been heated and shaped by the heating shaping die 2 and cooled and solidified by the cooling shaping die 3 is heated again by the surface heating die, thereby forming the shaped body. By removing the skin layer on the surface, it is possible to relatively easily provide a composite resin extruded product having fine irregularities on the surface capable of expressing a woody feeling. In the invention according to claim 4, the surface heating type is, for example, JISB0.
601 has a surface roughness Rmax of 10 μm to 1000
Since it has a surface heating mold having a rough inner surface, such as a surface state of μm, it is possible to form moderate surface roughness, that is, fine irregularities on the surface of the shaped body, A composite resin extruded product having a texture can be provided easily. In the present invention according to claim 5, the composite resin composition contains 100 to 400 parts by weight of a plant filler and 100 to 400 parts by weight of an α, β-unsaturated carboxylic acid monomer based on 100 parts by weight of a thermoplastic resin. The above-mentioned effects can be more reliably exerted because it contains parts by weight and the polymerization initiator.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing an example of an extrusion molding apparatus suitable for use in the practice of the present invention described in claim 1 or 2.

2 shows an example of a shaping plate 4 of the apparatus shown in FIG. 1, wherein (a) is an enlarged front view and (b) is an enlarged side view.

3A and 3B show another example of the shaping plate, wherein FIG. 3A is an enlarged front view and FIG. 3B is an enlarged side view.

4A and 4B show still another example of the shaping plate, wherein FIG. 4A is an enlarged front view, and FIG. 4B is an enlarged side view.

FIG. 5 is a schematic side view showing an example of an extrusion molding apparatus suitable for use in carrying out the present invention according to claim 3 or 4.

FIG. 6 is an enlarged front view showing an example of a surface heating mold 5 of the apparatus shown in FIG.

FIG. 7 is a schematic plan view of an extruded sample obtained in Example 1.

FIG. 8 is a schematic plan view of an extruded sample obtained in Example 2.

FIG. 9 is a schematic plan view of an extruded sample obtained in Example 3.

FIG. 10 is a schematic plan view of an extruded product sample obtained in Example 4.

FIG. 11 is a schematic plan view of an extruded sample obtained in Comparative Example 1.

[Explanation of symbols]

 1. Extruder 2. Heat shaping mold 3. Cooling shaping mold 4. Shaping plate 5. Surface heating mold 6,10. Extrusion molding equipment 7. Shaping body 8. Molding body 10. ..Extrusion molding equipment

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F207 AA01 AA11 AA20L AB02 AB04 AB07 AB11 AB16 AB19 AB25 AG01 AG05 KA01 KA06 KA11 KA17 KK13 KK45 KL63 KL84

Claims (5)

[Claims] 1. When extruding a composite resin composition containing a thermoplastic resin and a plant-based filler, after the extruder,
A method of extruding by means of an extruder in which a heating shaping mold and a cooling shaping mold are directly attached in this order, wherein the heating shaping mold and the cooling shaping mold are formed along the extrusion direction between the heating shaping mold and the cooling shaping mold. A method for producing a composite resin extrudate, wherein a plurality of irregularities are provided on the surface of the molded body. 2. A method for forming a plurality of irregularities with fluctuations along the extrusion direction of the surface of the shaped body at the resin outlet of the heating shaping mold, wherein the shaping part is formed in the thickness direction of the shaped body. The method for producing a composite resin extruded product according to claim 1, wherein the method is performed by a shaping plate on which a plurality of convex portions or concave portions corresponding to the plurality of irregularities are formed. 3. An extruder obtained by extruding a composite resin composition containing a thermoplastic resin and a plant-based filler, in which a heating mold, a cooling mold and a surface heating mold are directly attached in this order. A method for producing a composite resin extrudate, characterized by extruding with a molding device. 4. The method for producing a composite resin extruded product according to claim 3, wherein the surface heating mold has a surface heating mold having a rough inner surface. 5. The method according to claim 1, wherein the composite resin composition is a thermoplastic resin 1
The composition according to claim 1, further comprising 100 to 400 parts by weight of a plant-based filler, 1 to 40 parts by weight of an α, β-unsaturated carboxylic acid-based monomer and a polymerization initiator with respect to 00 parts by weight. 4. The method for producing a composite resin extruded product according to any one of the above items 4.