JPH07266313A - Woody synthetic powder, its manufacture and device, woody synthetic plate using the powder, and method and apparatus for extrusion molding the plate - Google Patents

Abstract

PURPOSE:To improve drape by mixing a specific value of thermoplastic resin molding material with that of cellulose crushed material having a specific value or less of containing water content and a specific value or less of mean particle diameter, gelling, kneading it, cooling, pulverizing and granulating to a specific value or less of particle size. CONSTITUTION:20-75wt.% of cellulose crushed material containing 15wt.% or less of water content and 20 mesh or less of mean particle size and 25-80wt.% of thermoplastic resin molding material are charged in a mixer 80 of fluidizing and kneading means. The crushed material is crushed by agitating impact blades 85-87, dried, the molding material are crushed by the blades 85-87, kneaded with the crushed material by frictional head, and gelled. The kneaded material is charged in a mixer 100 of cooling and granulating means through an exhaust duct 93. The kneaded material in an arm 103 is agitated by agitating crushing blades 104, cooled with cooling water of a jacket 102 to form granulated powder, which is discharged from an outlet 107. The powder is further granulated to 10mm or less of particle diameter by using granulating means to form woody synthetic powder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention includes a synthetic wood powder mainly composed of cellulosic crushed materials, a method and an apparatus for producing the synthetic wood powder, a synthetic wood plate using the synthetic wood powder, and the synthetic wood plate. With respect to the extrusion molding method and apparatus for a wooden synthetic board, more specifically, in order to extrude by kneading the cellulosic crushed material and a thermoplastic resin molding material with an extruder and molding into a predetermined wall thickness from a molding die. The present invention relates to a synthetic wood powder suitable for use, a manufacturing method and an apparatus thereof, and a method and an apparatus for extruding a synthetic wood board by the above extruder.

In particular, one or both of the cellulosic crushed material and the thermoplastic resin molding material are used in a wide range of applications such as construction waste materials, automobiles, household electric appliances, and daily necessities with the diversification of life. A wide variety of, and a large amount of used, a means for reusing waste materials of various thermoplastic synthetic resin products that have been discarded in large quantities and recycling as a wood synthetic board and the wood synthetic board itself according to the present invention The present invention relates to a means for providing a recyclable wood synthetic board.

[0003]

2. Description of the Related Art Conventionally, molding resin products based on this kind of wood powder have been variously developed for the purpose of improving water resistance, heat insulation, etc., and in particular, there has been a recent demand for preservation of the global environment. From the standpoint of securing forest resources, the soaring cost of timber, and the perceptually strong latent demand for timber products, the development of such wood synthetic boards is required.

However, in the conventional extrusion molding of this kind of wood-based synthetic board, a cellulosic crushed material, for example, wood powder obtained by crushing wood, rice grain, bacas, crushed chip material, pulp material, etc. The fluidity of the cellulosic crushed material when mixing and crushing the crushed material, and the crushed material of the cellulose type, such as the dispersibility of the wood powder and the resin material, has a great effect on the properties of the wood powder during extrusion molding. Met.

That is, the fact that the crushed cellulosic materials such as these wood powders have a large frictional resistance when flowing, and that they are not well compatible with the resin material, make the texture of the wood powders in the molded wood composite board coarse and dense. If the wood powder and resin are filled and heated in the extruder, a large amount of steam or wood acid gas will be generated from the mixed wood powder, which may cause corrosion or molding of the inner wall of the extruder. This causes wear of a die, a molding die, and the like, and also causes roughening of the surface of the molded wooden synthetic board itself, bubbles, cavities, and the like, which causes various problems in extrusion molding.

Among the crushed cellulosic materials, wood powder is impacted, sheared, and crushed by using a crusher such as an impeller mill or a ball mill for the above-mentioned construction waste materials, waste materials such as sawdust in the lumbering process and the woodworking process, and other raw wood. The wood powder obtained by crushing by an action such as rubbing is fluffy and contains many long and narrow fibrous wood powders, and the dispersibility in resin materials, solvents and solutions is extremely poor. Agglomeration is likely to occur even during the storage process, and particularly when mixed with a resin material to form a synthetic wood board, it has a drawback of agglomeration. Therefore, the angular portion, protruding portion, cilia-shaped beard portion, etc. of this wood powder are deformed into spherical or spherical-like particles by crushing due to friction between the crushing balls, so that they are relatively fluid. And wood powder with good dispersibility is molded. However, even if such improved wood flour is used, since the wood flour and the resin material have different fluidities, the effect of wood flour on molding is not completely avoided, and the effect of wood flour on molding is not avoided. It was important to select a molding method that responded to the action.

Further, as described above, the wood powder itself is improved in terms of fluidity and dispersibility, and at the same time, the wood powder and the thermoplastic resin molding material are well acclimated to each other during molding of the synthetic wood board. To maintain a good kneading and kneading state is a major factor for forming a uniform and dense wood composite board by reducing the friction resistance of wood powder with a thermoplastic resin molding material that has a smaller friction resistance than wood powder. It was something that However, in the past, it has been a problem to improve the compatibility between the wood powder and the thermoplastic resin molding material.

[Conventional Method for Forming Wood Synthetic Board] In the conventional method for forming a wood synthetic board, typical examples are the calender molding method and extrusion molding method shown below, and hot press molding. There is a law.

[Calendar Forming Method] A calender forming method for a wood synthetic board is, for example, as disclosed in Japanese Patent Publication No. 4-7283, for a hopper of an extruder, a grain size of 80 to 80.
300 mesh wood powder and thermoplastic resin molding material are directly added as powder or pellets to mix the wood powder into the thermoplastic resin material, which is heated by an open-type extruder, kneaded, or has a particle size. After thoroughly mixing 80-300 mesh wood powder and a thermoplastic resin molding material in a blender, knead this with a kneading device such as a pressure kneader or Banbury, and guide the kneaded dough to an extruder by a hopper. Then, as shown in FIG. 15, the screw 51 was extruded onto the front surface of the forming hot roll 52, and the extruded dough was heated and roll-formed to a predetermined thickness with the hot roll 52. The open-type extruder omits the forming die and forms a simple extrusion opening 54. In this opening 54, the opening 54 and the forming heat roll 52 are provided.
A guide 55 is provided to connect between the
Reference numeral 5 is composed of a bottom plate and a side plate which are sufficiently heated by heating means such as an electric heater 56, and an infrared heater 57 is arranged above the guide 55.

The reason why the heat is kept warm while reaching the heating roll 52 is that when the sufficient heat storage state of the extruded dough is lost, the peripheral portion of the extruded dough rapidly drops,
Only the central portion is drastically pulled by the heat roll 52, resulting in wrinkles in the formed fabric, and further, the texture of the molded product is made coarse and dense, which causes deformation such as warp distortion. It was to avoid it.

Further, the extruded dough is drawn into a plate shape in a state of being sufficiently compacted and rolled by the hot roll 52, and then the correction roll 53 corrects the coarseness and fineness of the tissue density at the time of compaction to prevent the warp of the compacted plate. It is intended to prevent the occurrence and to correct the warp and bending of the forming plate by a plurality of rolls (not shown) which press the front and back surfaces of the forming plate alternately at appropriate intervals. The extruder is a single-screw or twin-screw extruder.

[Extrusion Molding Method] In the conventional extrusion molding method for a wood-based synthetic board, for example, as disclosed in Japanese Patent Publication No. 3-59804, wood powder is mixed with a thermoplastic resin molding material, and an extruder is used. By heating and kneading, and extruding into a tube shape through a molding die 61 provided at the discharge port of the extruder as shown in FIG. 16 (A).
By cutting and expanding with a cutter 62 such as a cutter in the extrusion direction of the cloth, a flat expanded cloth 62 is formed as shown in FIG. 16 (B). Next, after the expansion material 63 is interposed and pressed between the heat rolls 64, 64, the correction roll 65 is used to remove the warpage due to the stress returning to the shape of the extruded tube. The plurality of rolls 66, which are alternately pressed at appropriate intervals, correct the warpage and bending of the molded plate.

[0013]

As described above, it has been a problem in the past to improve the familiarity between the wood powder and the thermoplastic resin molding material.

Further, the wood powder and the thermoplastic resin molding material are directly added to the hopper of the extruder in the form of powder or pellets, or the wood powder and the thermoplastic resin molding material are blender, pressure kneader, Banbury, etc. When the kneading device is kneaded and the kneaded dough is guided to the extruder by the hopper, the wood powder has already been crushed and finely divided into particles of 80 to 300 mesh. It was not possible to use wood powder with a large particle size due to the effect of the frictional resistance of the above, that is, charring during molding extrusion, causing the structure of the molded plate to become coarse and dense, and causing deformation such as warpage distortion. . Moreover, it takes time to make the wood powder finer, while if the wood powder is made more finely than necessary, there is a problem that the wood resin becomes less compatible with the thermoplastic resin molding material.

In the conventional method for molding a wood-based synthetic board,
There were the following problems. [Problems of calender molding method] (1) Large friction resistance when wood powder flows,
The problem at the time of molding due to the unfamiliarity with the resin material is that the molding die is omitted, the guide 55 for connecting the opening 54 and the heat roll 52 is provided, and the extrusion molding dough that flows through the guide 55 is heated and kept warm. By doing so, the frictional resistance when the wood powder flows is reduced. Furthermore, heat roll 5
By performing the roll-forming between 2 and 52, the extruded material extruded by the extruder is heated rolls 52, 52
Since the distance passing through the space becomes short, that is, the distance that the extruded material contacts the surface of the heat rolls 52, 52 becomes short, and as a result, the friction between the wood powder and the heat roll is minimized, This avoids the texture of the molded wood composite board becoming coarse and dense. However,
In the calender molding method, the extrusion molding material is not formed by applying a pressing force, but the extrusion molding material is simply flowed and drawn according to the rotation of the heat roll, so that the synthetic wood board is formed at high density. There was a limit.

(2) In the case where the extruder and the heat roll are connected by a guide as shown in Japanese Patent Publication No. 4-7283, the guide is connected to the single screw 51 or twin screw extruder. There was a problem that the width of the wood was limited and it was not possible to form a wide wooden synthetic board.

(3) The molded plate drawn by rolling and rolling by the hot roll 52 is corrected by the correction roll 53 to correct the density of the tissue density at the time of rolling and prevent the warping of the molded plate. Since the warp and bending of the forming plate are corrected by a plurality of rolls that alternately press the front and back surfaces of the forming plate at appropriate intervals, it is actually impossible to sufficiently correct the warp and distortion of the forming plate. Moreover, it causes internal residual stress in the molded plate. This internal residual stress caused distortion such as warpage and twist in the formed plate due to aging contraction after forming or expansion and contraction due to temperature change. Further, when the molded plate is subjected to secondary processing, for example, when press processing is applied by a hot press molding method or the like, it causes a distortion more than expected in the processed product.

(4) Unlike other molding machines, calender molding requires a combination of quite a lot of related equipment, so that although it is high-speed and mass-producible, it has the following advantages: There was a problem that the facility cost was large.

[Problems of Conventional Extrusion Molding Method] (1) Direct molding of a molding plate into which a large amount of wood powder having a large frictional resistance is mixed with an extruder through a molding die is caused by the frictional resistance at the time of extrusion. Although it was almost impossible, in the extrusion molding method disclosed in Japanese Patent Publication No. 3-59804, since the molding die extrudes the material into a thick tube, Since the die outlet is circular and the flow path between the die outlet and the discharge port of the extruder is relatively short, the friction die resistance during extrusion is reduced as much as possible, and the molding die is intended for smooth and rapid extrusion molding of resin. Was able to be formed. However, when a synthetic wood board is extruded using a T-die type molding die that directly forms a wider molding board than the molding die, the friction resistance of the wood powder is large, so the extruded material is wide and narrow. There is a problem that it is extremely difficult to evenly and uniformly flow a relatively long distance into the molding die.

(2) In the extrusion molding method disclosed in Japanese Examined Patent Publication No. 3-59804, the expanded material is interposed between the molding hot rolls,
After pressing, it is necessary to remove the warpage due to the stress returning to the extruded tube shape with the correction roll, so in actuality, as in the calender molding method described above, the warpage and distortion of the molded plate are actually corrected sufficiently. It is impossible to do so, and it causes internal residual stress in the formed plate, causes distortion such as warpage and twist over time, and causes unexpected distortion in press working such as hot press molding. It was the cause.

(3) Although the extrusion molding method disclosed in Japanese Patent Publication No. 3-59804 is extrusion molding, as described in the above item (2), the stress returning to the shape of the extruded tube with the correction roll is used. It is necessary to remove the warpage due to, compared with the production equipment by general extrusion molding,
There was a problem that the facility cost was large.

(4) In the extrusion molding method disclosed in Japanese Patent Publication No. 3-59804, the extrusion tube shape is formed and the correction roll is formed into a plate shape, and therefore,
Unlike the molding of general resin films, etc., since it is the molding of a wood synthetic board, there is a problem that it is difficult to mold it into a thick plate shape.

(5) When a T-die type molding die is used to extrude a thick wood synthetic board having a thickness of 12 mm, the flow condition of the extruded dough in the molding die is deteriorated and the formed board is However, there is a problem in that the density becomes uneven, and the molded plate eventually becomes wavy or deforms into an irregular shape, and cannot be a product.

(6) When a wooden synthetic board was extrusion-molded using a T-die type molding die, although the ordinary wooden synthetic board had a gray color, the heat of the heater provided in the molding die caused the inside of the extruded cloth to be removed. As the wood powder burns, it turns dark brown,
There was a problem in that quality and characteristics such as impact resistance were deteriorated because wood powder was burnt as well as appearance problems.

The present invention was developed in order to solve the above problems, and constantly maintains a state in which a thermoplastic resin molding material is immobilized on thermally and chemically stable wood powder particles. In order to constantly maintain the mixed state and dispersed state of the wood powder and the thermoplastic resin molding material in such a manner that it is possible to provide a synthetic wood powder having good fluidity, and a method and an apparatus for manufacturing the synthetic wood powder. Furthermore, during extrusion molding using the above-mentioned synthetic wood powder, the familiarity between the wood powder and the resin is kept good, the generation of air bubbles, nests, etc. are suppressed around the wood powder, and the density between wood powders is uniform and high. A wood synthetic board having a wide range of thicknesses from thin to thick boards and an extrusion molding method of the wood synthetic board are provided.
An object of the present invention is to provide a wood synthetic board having a wall thickness of 0 mm or more, and an extrusion molding method and apparatus for molding the wood synthetic board. It is another object of the present invention to provide an extrusion molding method and apparatus for molding a wide wooden synthetic board having a small internal residual stress.

[0026]

In order to achieve the above object, the woody synthetic powder of the present invention has a water content of 15 wt% or less and an average particle size of 20 mesh or less cellulosic crushed material 2.
Thermoplastic molding material 25-80 wt% for 0-75 wt%
%, Mixed by gelling, cooled and pulverized, and sized to a particle size of 10 mm or less (claim 1). Further, as a method for producing the above-mentioned synthetic wood powder, the water content is 15 wt. % To 20% to 75% by weight of a cellulosic crushed material having an average particle size of 20 mesh or less, 25% to 80% by weight of a thermoplastic resin molding material is mixed together by a stirring impact blade, kneaded by gelation by frictional heat, and then cooled. Then, at least the step of pulverizing and sizing to a particle size of 10 mm or less is included (claim 2). Further, the above-mentioned wood-based synthetic powder manufacturing apparatus has a water content of 15 wt% or less and an average particle size of 2
A fluid mixing and kneading means having a stirring and impacting blade for mixing 25 to 80 wt% of a thermoplastic resin molding material with 20 to 75 wt% of a cellulosic crushed material of 0 mesh or less and gelling and kneading by friction heat, and the above gel. Cooling granulation means for cooling and granulating the compounded kneaded material has a stirring and crushing blade, and a jacket has an inlet and an outlet for cooling water, and the cooled and granulated wood powder is adjusted to a particle diameter of 10 mm or less. It is characterized by comprising a sizing means for granulating (claim 3).

The extruded dough extruded into the molding die by heating and kneading the above-mentioned synthetic wood powder is gradually cooled, and the extruded dough is restrained against the extruding force to obtain the density of the extruded dough. It is characterized in that a wood-based synthetic board characterized by being made higher is obtained (claim 4).
Further, in the above-mentioned method for producing a wooden synthetic board, the content of water is set to within 15 wt% and the thermoplastic resin molding material is added in an amount of 25 to 80 wt% with respect to 20 to 75 wt% of the cellulosic crushed material having an average particle size of 20 mesh or less. Both are mixed by stirring impact blades,
Gel-kneading and kneading by frictional heat, then cooling, crushing, heating and kneading wood-based synthetic powder that has been sized to a particle size of 10 mm or less, and the extruded dough extruded into a molding die with a screw is gradually cooled, and At least a step of increasing the density of the extruded dough by applying a suppressing force against the extruded dough to the extruded dough (claim 5). Furthermore, in the extrusion molding method of a wood-based synthetic board of the present invention, a crushed cellulosic material, for example, wood powder is used as a thermoplastic resin molding material in an amount of 20 to 20.
75% by weight, preferably 30 to 70% by weight, mixed and heated,
The mixture is kneaded and extruded into a molding die 10 with a screw, and the extruded material 79 is stuck or coated with a sheet 24 of polyflutolethylene (herein, simply referred to as "fluorine resin") on the inner wall surface. It is extruded into the molding portion 21 of the molding die 10 to be molded into a predetermined wall thickness, and is gradually cooled in the molding portion 21 and extruded (claim 6).

The thermoplastic resin molding material is a resin such as PVC (polyvinyl chloride), PET (polyester), PP (polypropylene), etc., and all the plastic collected from the waste resin molded product, or virgin resin to these collected resins. The plastic pellets may be used in a mixture of half amount, and the mixing ratio of the thermoplastic resin molding material and the cellulosic crushed material is (1) when the thermoplastic resin molding material is PP, the cellulose crushed material Is mixed up to 75 wt% at the maximum, and the range of the ratio of crushed cellulosic material is 20 to 75 wt%, preferably 30 to 70 wt%, but preferably 30 to 70 wt%.
It is 65 wt%. (2) When the thermoplastic resin molding material is PET, the cellulosic crushed material is mixed up to 75 wt% at the maximum, and the mixing ratio of the cellulosic crushed material is preferably 20 to 60 wt%. It is preferably 35 to 50 wt%. (3) When the thermoplastic resin molding material is PVC, the mixing ratio of wood powder is 30 to 60% by weight, preferably 45% by weight.

In another extrusion molding method of the present invention, the crushed cellulosic material such as wood powder is used as the thermoplastic resin molding material in an amount of 20 to 75 wt%, preferably 30 to 7%.
A mixture of 0 wt% is mixed, heated, kneaded, extruded with a screw into the molding die 10, and the extruded cloth 79 is formed with the fluororesin sheet 24 attached to the inner wall surface or coated with the fluororesin. Is extruded into a predetermined thickness and gradually cooled in the forming part to be extruded, and the extruding force applied to the forming plate 29 by the extruder is restrained by the brake means 30. The density of the extruded dough 79 in the forming section 21 is increased by applying a resistance force to the extruded dough 79 in the forming chamber 22 via 29 to prevent the extruding dough 79 from being formed (claim 7).

The extruded material 79 is formed into a molding die 10
It can be extruded into the molding section 21 of the molding die 10 by heating it in the introduction section 11 of the above (claim 8).

In the extrusion molding apparatus for a wood-based synthetic board of the present invention, a crushed cellulosic material is used as a thermoplastic resin molding material.
˜75 wt%, preferably 30 to 70 wt%, mixed, heated, kneaded, and introduced into an extrusion die 78 of an extruder for extruding with a screw, and an introduction section 11 for heating the extruded dough 79 discharged from the extrusion die 78, Molding chamber 2 for molding the extruded dough 79 extruded from the introduction portion 11 to a predetermined thickness
The molding die 10 consisting of the molding part 21 provided with 2 is connected. Further, the molding die 10 is provided with a cooling means for sticking or coating a fluororesin sheet 24 on the inner wall surface of the molding part 21 and for cooling the molding chamber 22 (claim 9).

As an extrusion molding device for the above-mentioned synthetic wood board, a thermoplastic resin molding material of 25 to 80 wt% is used for 20 to 75 wt% of a cellulosic crushed material having a water content of 15 wt% or less and an average particle size of 20 mesh or less. %, The fluidized mixing and kneading means having a stirring impact blade for gelling and kneading by frictional heat, and a stirring and crushing blade for cooling and granulating the gelled kneaded material have a cooling water in a jacket. Cooling and granulating means having an inlet and an outlet, sizing means for sizing the cooled and granulated granulated wood powder to a particle size of 10 mm or less, and heating and kneading the wood-based synthetic powder. The extruder die for extruding with a screw is provided with an introducing section for heating the extruded dough discharged from the extruding die, and a molding chamber for extruding the extruded dough extruded from the introducing section into a predetermined wall thickness. From molding section The molding die is connected to the molding die, and a fluorocarbon resin sheet is attached to the inner wall surface of the molding part or a cooling means for coating the fluorocarbon resin and cooling the molding chamber is provided in the molding die (claim) 10).

In the above synthetic wood powder, the method for producing synthetic wood powder, the apparatus for producing synthetic wood powder, the synthetic wood board, the method for extruding a synthetic wood board or the extruding machine for synthetic wood board, as a cellulosic crushed material. 60-75 wt% wood powder and polypropylene or polyethylene as a thermoplastic resin molding material 2
It is preferable to mix 5 to 40 wt%.

Similarly, it is preferable to mix 60 to 65 wt% of wood powder as a cellulosic crushed product and 35 to 40 wt% by mixing one or more of polycarbonate, nylon, or PVC as a thermoplastic resin molding material. .

Further, in the above-mentioned method for producing a synthetic wood powder, a production apparatus for a synthetic wood powder, a method for extruding a synthetic wood board or an apparatus for extruding a synthetic wood board, an aqueous urea solution having a concentration of 40% is added to a cellulosic crushed product. It is preferable that 1 wt% is mixed from the viewpoint of neutralizing effect of wood acid gas.

In addition, calcium carbonate or titanium oxide is added to the cellulosic crushed product and the thermoplastic resin molding material in an amount of 5
It is preferable that the content is ˜20 wt% to increase the shearing force.

Further, in the method or apparatus for producing the synthetic wood powder and the method and apparatus for producing a synthetic wood board using the synthetic wood powder, the cellulosic crushed materials are stirred and mixed by a stirring impact blade, and are heated by friction heat. Drying, and then mixing the cellulose-based crushed product with a thermoplastic resin molding material by a stirring impact blade, kneading by gelation by frictional heat, cooling, crushing and sizing to a particle size of 10 mm or less, It is possible (claims 11 and 12).

Further, the introduction portion of the molding die for heating the extruded material discharged from the extrusion die of the extruder has a total length of 70 to 95% of the total length in the width direction of the introduction portion, and the introduction portion. It is possible to provide a guide plate having a height of 70% or less of the height (claim 13).

Further, a fluororesin sheet may be attached to or coated with the fluororesin on the surface of the guide plate. (Claim 14).

The above-mentioned fluororesin includes polytetrafluoroethylene (Teflon TFE; DuPont), fluoroethylene-propylene copolymer (Teflon FEP), polytrifluoroethylene chloride (Teflon CTFE), polyvinylidene fluoride (Teflon). VdF) or the like can be used.

The method of coating the inner wall surface of the molding chamber 22 and the surface of the guide plate with a fluororesin is particularly easy to replace and easy to process, and thus has excellent durability. It is preferable to stick a sheet 24 coated with a fluororesin film on the surface of the woven glass cloth. Further, the glass woven fabric may be a non-woven fabric of glass fiber.

The coating of the inner wall surface of the molding chamber 22 with the fluororesin can be applied to the inner wall surface of the molding chamber 22 corresponding to the surfaces forming the front and back surfaces of the molding plate.
It is desirable that the entire upper, lower, left and right inner wall surfaces of the molding chamber 22 be processed with fluororesin.

The cooling means for cooling the molding chamber 22 is
A cooling pipe 25 that circulates cooling water can be provided in the molding die 10 around the molding chamber 22, but in order to improve the gradual cooling effect of the extruded dough 79 in the molding chamber 22, the molding unit 21 of the molding unit 21 is improved. It is advisable to provide the cooling pipes 25 such that the intervals between the cooling pipes 25 gradually decrease in the extrusion direction. However, the structure is not limited to this.

In another extrusion molding apparatus of the woody synthetic board of the present invention, a crushed cellulosic material such as wood powder is mixed in a thermoplastic resin molding material in an amount of 20 to 75% by weight, preferably 30 to 70% by weight, and the mixture is heated and kneaded. Then, the introduction die 11 for heating the extrusion dough 79 discharged from the extrusion die 78 to the extrusion die 78 of the extruder for extruding with the screw, and the extrusion dough 79 extruded from the introduction portion 11 to have a predetermined wall thickness. Molding die 1 comprising a molding part 21 having a molding chamber 22 for molding
Connect 0. Further, the molding die 10 is provided with a cooling means for sticking or coating the fluororesin sheet 24 on the inner wall surface of the molding part 21 and for cooling the molding chamber 22.
To be installed. Further, a braking means 30 for applying a restraining force against the pushing force of the molding plate 29 extruded from the molding die 10 is provided.

Further, it is possible to provide braking means for applying a restraining force against the pushing force of the molding plate extruded from the molding die (claim 15).

The braking means 30 is used for the molding plate 2
A pair of pinch rollers 31 that sandwich and press-contact the front and back surfaces of 9 are provided, a brake drum 33 is provided at the shaft end of the pinch roller 31, and a friction body such as a brake belt 35 that suppresses rotation of the brake drum 33 is provided. The brake drum 33 may be in pressure contact with the brake drum 33 (claim 1).
6).

Further, the brake means is provided with a plurality of pairs of upper and lower pinch rollers which sandwich and press-contact the front and back surfaces of the forming plate, and the pinch rollers are rotatably provided at both shaft ends of the upper pinch roller. Connect the rod ends of
It is possible to adjust the pressing force to the lower pinch roller via the forming plate in an adjustable manner (claim 17).

Further, the braking means is provided with a plurality of pairs of upper and lower pinch rollers that sandwich and press-contact the front and back surfaces of the molded plate, and connect the shaft end of one pinch roller to the input shaft of the powder brake. Gears provided at the shaft ends of the pinch rollers may be meshed with each other (claim 18).

Further, the braking means 30 is the molding plate 2
It is also possible to press the brake plates made of an elastic material such as rubber or resin having a length extending over the entire width of 9 to the front and back surfaces of the molding plate 29. Furthermore, if necessary, the braking means 30
It is possible to provide a plurality of.

Further, at the introduction portion, an introduction hole is formed in the molding die in the width direction of the molding die, the introduction hole being bulged to have an elliptical longitudinal section.

In addition, the introduction portion is coated with a coating which is curved in the width direction of the molding die and has both ends extending to both ends in the longitudinal direction of the molding chamber inlet.
An introduction chamber is formed in a hanger shape and has a triangular cross section in a direction in which the vertical cross section gradually narrows toward the molding chamber from the introduction hole to the molding chamber inlet.

Further, in the extrusion die of the one extruder,
The second molding die can be provided so as to communicate with each other to improve the production capacity.

The extrusion die of the extruder forms a rectangular injection port having a height equal to or 70% of the height of the molding chamber of the molding section of the molding die, and the cross-section gradually narrows toward this injection port. Can be formed.

Needless to say, the above-mentioned thermoplastic resin molding material may be a resin such as those mentioned above, or may be used alone or as a mixture of several kinds thereof.

[0055]

[Function] The above wood synthetic powder makes the grain size of the wood powder fit well with the thermoplastic resin molding material, reduces the friction resistance of the wood powder during gelation kneading and molding extrusion, and prevents wear and damage of the molding machine. In order to achieve the above, granules or powders having an average particle size of 20 mesh or less are vaporized to volatilize wood acid gas during gelation kneading and molding to reduce generation of water vapor or bubbles,
The amount of water contained is 15 to prevent surface roughening.
Within wt%, preferably within 11 wt%, ideally 8 wt%
Within the range of.

20 to 75 wt% of the total raw material, preferably 30 to 70 wt%, more preferably 35 to 65 wt% of cellulosic crushed material such as wood powder and the remaining thermoplastic resin molding material When the content is 20% or less, the mixture as the material to be kneaded becomes a large lump and is not solidified by the mixing with the thermoplastic resin molding material in the fluidized mixing and kneading means and does not gel, and the particle size is adjusted to 10 mm or less. Prevents burning when molding and extruding,
This is to reduce the frictional resistance of the synthetic wood powder and prevent the wear and tear of the molding machine.

In the fluid mixing and kneading means, the cellulosic crushed material such as wood powder is crushed by the stirring impact blade and dried by the friction heat of the stirring impact blade and the raw material itself.
The water content is dried to about 0.3%, and the thermoplastic resin molding material is kneaded with the cellulosic crushed material by a stirring impact blade, and the frictional heat of the raw material itself gives about 180 to 200.
The mixture is kneaded and gelled without being agglomerated even at the time of mixing and dispersion at ° C, and the water content is dried to about 0.3 wt%. Then, the kneading material in the jacket is cooled by the granulating means so that The plastic resin molding material is dried while being cooled to the freezing point, that is, near the melting point (melting point + 10 ° C),
Granulated wood powder is obtained by granulating with a stirring and crushing blade to a particle size of about 25 mm or less and solidifying.

Further, the granulated wood powder is sized by a sizing means consisting of a crusher such as a cutter mill having a screen of 8 mm, and the particle size (minor axis) is 10 mm or less, preferably 3 mm.
~ 5mm rice grain size synthetic wood powder is obtained. As described above, the so-called thermoplastic resin molding material is mixed with the wood powder and the thermoplastic resin molding material so that the thermally and chemically stable state of being fixed to the wood powder grain can be constantly maintained. , A synthetic wood powder that gives good fluidity is formed in order to maintain the dispersed state constantly, and combined with the condensation and shrinking action by cooling, a synthetic wood powder that is not caused by a chemical reaction or adhesion is formed. .

Then, the synthetic wood powder is heated and kneaded by an extruder and is extruded into a dough 79 from an extrusion die 78 by a screw and is extruded to an introduction portion 11 of the molding die 10.

First, when the guide plate 15 is provided while the extruded material 79 is heated and kept warm in the introducing section 11 to maintain the fluidity and maintains a good kneading state, the extruded material 79 is introduced into the introducing section 11 by the guide plate. Depending on the raw material, the extruded material 79 may prevent different linear expansions in the central part and the end part in the extrusion direction to make the molecular orientation different, to homogenize the linear expansion, control the molecular orientation, and form It is evenly diffused into the molding chamber 22 of the part 21 and extruded at a uniform density. Since the inner wall surface of the molding chamber 22 is coated with or coated with the fluororesin sheet 24 having a small friction coefficient, the cellulosic crushed material in the extruded material 79 passing through this inner wall surface is greatly resisted. Because it flows smoothly without being extruded, it is extruded while maintaining a uniform and high-density kneaded state. This molding room 2
In the process of being extruded in 2, the extruded material 79 is at room temperature to 6
The forming plate 29 is formed by being gradually cooled and cooled by a cooling medium such as water or oil at 0 ° C to 90 ° C. Since the fluororesin has a lower coefficient of thermal conductivity than metal, the extruded material 79 is gradually cooled, and the distortion due to cooling is reduced, so that the wood synthetic board, which is the molding board 29 as a uniform and high-density product with less distortion, is formed. It

Further, the molding plate 2 added by the extruder.
A braking force is applied to the pushing force to the sheet 9 by the braking means 30, and a reaction force against the pushing force is applied to the pushing material 79 in the shaping chamber 22 through the shaping plate 29. For example, by pressing a friction body against a brake drum 33 provided at one shaft end of a pair of pinch rollers 31 that sandwich and press the front and back surfaces of the molding plate 29, the rotation of the brake drum 33 is suppressed, The pushing force of the forming plate 29 suppresses the rotation of the pinch roller 31 that rotates, and the pinch roller 31 applies a suppressing force against the forming plate 29 against the pushing force.

Further, a plurality of pairs of upper and lower pinch rollers which sandwich the front and back surfaces of the forming plate and press contact with each other are provided, and the pinch rollers are rotatably connected to the rod tip ends of the air cylinders at both shaft ends of the upper pinch roller. However, the braking means, which is provided with the pressing force adjustable to the lower pinch roller via the forming plate, applies a load of 6,000 kg to the forming plate, and the axial end of one pinch roller. Is connected to the input shaft of the powder brake, and the gears provided at the shaft ends of the pinch rollers are meshed with each other to form a uniform and high-density wood composite plate with a plate thickness of 30 mm.

The restraining force is applied to the forming part 2 via the forming plate 29.
1 does not exert a restraining force on the molding plate 29 as described above by giving a resistance to the extrusion dough 79 in the introduction part 11 and the extrusion force of the extrusion dough 79 in the molding chamber 22 applied by the extruder. Compared with the case, the entire extruded material 79 in the molding chamber 22 has a more uniform density and a higher density. Therefore, a more uniform and high density wooden synthetic board containing a large amount of cellulosic crushed material is formed.

For the above reason, the extrusion die 78 is different from the usual nozzle-shaped die in that the thickness of the molding plate 29 is, for example, 12 mm.
The height is 12 mm, which is the same as the mm, and the injection port is formed in a rectangular shape with a width of 50 to 150 mm, a large amount of molten synthetic wood powder is discharged, consolidation can be promoted, and die clogging can be prevented. .

[0065]

EXAMPLES Examples will be described with reference to the drawings.

1. Production Example of Woody Synthetic Powder 1-1. [Fluid Mixing and Kneading Means] In FIG. 1, 80 is a fluid mixing and kneading means for mixing raw materials and kneading to form a “kneading material”.
For convenience, it is called a "mixer".

Reference numeral 81 denotes a mixer main body, which is a cylindrical casing having an upper surface opening and a capacity of 300 liters. The opening is an input port 94 for inputting raw materials into the mixer main body 81, and this input port 94 is opened and closed. Cover with the free upper lid 82. A gas discharge pipe 95 for discharging a large amount of steam or wood acid gas generated from wood powder in the mixer body 81 is connected to the upper lid 82. Furthermore, the mixer body 8
A discharge port 88 is provided on the outer peripheral surface near the bottom surface of No. 1 and a lid 89 for covering the discharge port 88 is provided at the rod tip of the cylinder 91.
Is openable and closable. A discharge duct 93 communicates with the discharge port 88.

Further, at the center of the bottom surface of the mixer main body 81, a shaft 83 which rotates at a high speed of 820 rpm / max is rotatably supported by the rotation driving means of a motor 37KW (DC) (not shown) upward in the mixer main body 81. A scraper 84, stirring impact blades 85, 86, 87 in order from bottom to top on the shaft 83
Is mounted and tightened with a tightening nut 92 from the tip of the shaft 83. The shape of each of the stirring impact blades 85, 86, 87 is not particularly limited, but in the present embodiment, it is two blades symmetrical about the axis 83. When three stirring impellers are stacked as shown in Fig. 1, it consists of a total of six blades.
Each of the blades is a plane with an equal angle (60
Are overlapped with each other so as to form a degree). When a plurality of stirring impact blades are provided, it is preferable that the raw materials be efficiently kneaded in such a manner that they are overlapped with each other at an angle that is equal to 360 degrees, which is the total number of stirring impact blades.

The scraper 84 is rotated by slightly sliding the bottom surface of the mixer body 81 into contact with the mixer body 8.
The raw material kneaded in 1 is scraped out so as not to remain on the bottom surface of the mixer body 81, and the raw material is circulated.

The raw material which is opened through the upper lid 82 and is introduced through the introduction port 94 is made of a crushed product of cellulose such as wood powder, thermoplastic resin molding material, urea, calcium carbonate, titanium oxide, pigment and other additives. .

Further, the above-mentioned calcium carbonate brings good dimensional stability to the woody synthetic board of the present invention and contributes to remarkably reducing expansion and contraction due to temperature change.
It prevents deformation of the molded product during extrusion and is inexpensive per se.

Further, the titanium oxide has good fluidity and dispersibility in a solution, and contributes to remarkably reducing expansion and contraction due to temperature change in the woody synthetic board of the present invention.

The thermoplastic resin molding material is obtained by crushing the above-mentioned discarded various resin moldings as they are or crushing the resin molding having the surface resin coating film into a plurality of small pieces, and by crushing the crushed individual pieces. On the other hand, a compression grinding action is added to grind and peel off the resin coating film, and a compression impact force based on microvibration is applied to each of the ground small pieces to crush and crush, and crush and crush. PVC that is used as a thermoplastic resin molding material by removing the resin coating film peeled off at any time
(Polyvinyl chloride), PET (Polyester), PP
One type of resin such as (polypropylene), PC (polycarbonate), nylon, or a mixture of several types thereof can be used.

As the thermoplastic resin molding material, recycled thermoplastic resin molding material obtained from waste material of thermoplastic synthetic resin product is reused, or virgin thermoplastic resin is added, or virgin thermoplastic resin is used. It is also possible to use, for example, 50% each of the resin and the recovered thermoplastic resin molding material.

The ranges of the amount of gelling wood powder in each thermoplastic resin molding material are shown below. When the thermoplastic resin molding material is PP, the wood powder is 35 to 75 wt% and the amount of PP is 25 to 65 wt%, preferably the wood powder is 60 to 75 wt%.
%, The amount of PP is 25 to 40 wt%, and when the thermoplastic resin molding material is PET, the same as in the case of the above PP,
When the thermoplastic resin molding material is PC, wood powder is 40 to 70 wt.
%, PC amount is 30-60 wt%, preferably wood flour is 60-65 wt%, PC amount is 35-40 wt%,
Especially preferred is 64 wt% wood flour and 36 wt% PC. When the thermoplastic resin molding material is PVC, wood powder is 30
~ 65 wt%, PVC amount 35-70 wt%, preferably wood flour 45-55 wt%, PVC amount 45-55
%, and when the thermoplastic resin molding material is nylon, it is the same as in the case of PC described above.

1-2. [Cooling and Granulating Means] In FIG. 2, 100 is a cooling and granulating means for mixing and stirring the above-mentioned kneading materials to form "granulated wood powder", and is referred to as "cooling mixer" in the present embodiment.

Reference numeral 101 denotes a mixer main body, which is a casing having an inverted conical shape, the upper surface of which is covered, while a discharge port 107 is provided at the lower end, and the discharge port 107 is openably and closably opened by a valve 106. A jacket 102 is formed in the outer peripheral wall of the mixer body 101, and cooling water is constantly supplied from the water supply pipe 108 to the drain pipe 109 in the jacket 102.
The temperature of the raw materials in the cooling mixer 100 is maintained so as to be cooled to near the melting point of the thermoplastic resin molding material. In addition, an exhaust duct (not shown) for exhausting steam or wood acid gas generated in the cooling mixer 100 is connected to the upper wall surface of the mixer body 101.

An arm 103 is rotatably supported about the center of the upper wall of the mixer body 101 so as to be rotatable in a substantially horizontal direction.
This arm 103 is connected to the motor 11 via a reduction gear 112.
It is rotationally driven by 1 at a speed of about 3 rpm. Further, the rotating shaft of the arm 103 is a hollow shaft, and another rotating shaft that rotates independently is provided in this hollow shaft, and the output shaft of the motor 105 is connected to this rotating shaft. On the other hand, a stirring and crushing blade 104 is supported at the tip of the arm 103, and the stirring and crushing blade 104 is a screw type in the present embodiment, and the rotational axis direction of the stirring and crushing blade 104 is inside the mixer main body 101. Along the peripheral wall surface, it extends downward substantially parallel to the vicinity of the lower end of the mixer body 101. Stirring crushing blade 10
Reference numeral 4 is connected to a rotating shaft connected to the output shaft of the motor 105 via a rotation transmitting means such as a gear provided in the arm 103, and is rotationally driven at a speed of 90 rpm.

A charging port 113 is provided on the upper wall of the mixer body 101, and the discharging duct 93 of the mixer 80 is connected to the charging port 113.

The kneading material formed by the mixer 80 described above is introduced into the mixer main body 101 from the input port 113 of the cooling mixer 100 through the discharge duct 93.
The stirring and crushing blade 104 is rotated at a speed of 90 rpm by the motor 105, and the arm 103 is horizontally rotated at a speed of 3 rpm by the rotational force of the motor 111 which is decelerated by the speed reducer 112. 104 rotates along the inner peripheral wall surface of the mixer body 101 so as to draw a cone, and agitates the kneaded material in the arm 103. The kneading material is cooled by the inner peripheral wall surface of the mixer body 101 cooled by the cooling water in the jacket 102, and the diameter is about 25 mm.
"Granulated wood powder" that has been granulated is formed below, and the granulated wood powder is discharged from the discharge port 107 by opening the valve 106.

The kneading material cooled by the cooling mixer 100 is preferably cooled to a temperature not higher than the freezing point, that is, the melting point of the thermoplastic resin molding material in the raw material. However, since the wood powder is mixed, the thermoplastic resin molding material is mixed. It is not necessary to lower the melting point to below the melting point of the material.
It is sufficient to cool to a temperature at which the thermoplastic resin molding material in the kneading material is higher than the melting point of the thermoplastic resin molding material in FIG.

By the way, when the thermoplastic resin molding material is PP, the melting point of PP is 165 ° C. In this embodiment, the kneading material gelled to 180 ° C. in the mixer 80 described above is put into the cooling mixer 100. It is cooled to 90 to 100 ° C. in about 10 to 15 minutes, and the cooling granulation by this cooling mixer is efficient. Regarding the cooling water in the jacket 102 at this time, the water supply pipe 1
The temperature of the cooling water supplied from 08 was 30 ° C., but the temperature of the cooling water drained from the drain pipe 109 was 40 ° C.

The cooling granulation means is not limited to the above-mentioned cooling mixer, but is provided with a stirring blade for stirring the kneaded material in the mixer body and the outer peripheral wall surface of the mixer body as described above. What is necessary is just to provide a jacket and cool the kneading material in the mixer main body with the cooling water flowing in the jacket.

The kneaded material formed by the mixer 80 can be cooled by only stirring with a general mixer not equipped with the jacket 102. In this case, the heat in the kneaded material is reduced. Even if it is cooled to a temperature about 10 ° C higher than the melting point of the plastic resin molding material, it is about 30
Since it takes time, it is desirable to form the granulated wood powder by the cooling granulation means of the cooling mixer as in this embodiment.

1-3. [Granulating means] The granulated wood powder formed by the cooling granulating means is further sized to a particle diameter of 10 mm or less by using a sizing means to form a "wood synthetic powder".

In FIG. 3, reference numeral 120 is a sizing means for sizing the above-mentioned granulated wood powder, and a "cutter mill" is used in this embodiment.

Reference numeral 121 denotes a cutter mill body, which is a cylindrical casing having an upper surface opening, and the opening is covered with a lid 122 which can be opened and closed. The lid 122 is provided with a charging port 123 for charging the granulated wood powder in the cutter mill body 121.

In the cutter mill body 121, there is provided a cutter support body 124 which is supported on the bottom surface of the cutter mill body 121 and rotates in the horizontal direction by a rotation driving means (not shown). 3 long blades 125 are installed on the
Are arranged so as to form an equal angle of 120 degrees in the rotation direction of the cutter support body 124, and the blade tips of the three rotary blades 125 are located on the same rotation locus. Further, the second fixed blade 126 is fixed to the cutter mill main body 121 at a position substantially symmetrical to the rotational locus of the blade tip of the rotary blade 125 with a slight gap with respect to the rotational trajectory of the blade tip of the three rotary blades 125. Fixed blade 1
26, the cutter support member 124, and the rotary blade 125 divide the inside of the cutter mill main body 121 into two parts, and a charging chamber 127 and a sizing chamber 128.
To form. The charging port 123 of the lid 122 communicates with the charging chamber 127. The second fixed blade 126 and the rotary blade 1
The gap with 25 can be freely adjusted so that the granulated wood powder can be sized to a desired size. Further, the sizing chamber 128 is partitioned by a screen 129 between the two fixed blades 126 so as to surround the circumference of the rotation locus of the rotary blade 125. The screen 129 is formed of a mesh through which a sized product, which is a “wood synthetic powder” having a size of about 8 mm, can pass in the present embodiment. Also, the cutter mill main body 1 of the sizing chamber 128
A discharge port 131 for discharging the sized product with the cutter mill 120 is provided at the lower end of 21.

In the above cutter mill 120, the lid 12
The cooling mixer 10 described above from the input port 123 of No. 2
When the granulated wood powder formed by 0 is charged and the cutter support 124 is rotated by a rotation driving means (not shown), the granulated wood powder is about 0.1 between the rotary blade 125 and the fixed blade 126 of the cutter support 124. It is possible to constantly maintain the state where the so-called thermoplastic resin molding material is fixed to thermally and chemically stable wood powder granules by cutting into ~ 8 mm wood synthetic powder and forming "wood synthetic powder". In order to constantly maintain the mixed state and the dispersed state of the wood powder and the thermoplastic resin molding material, a woody synthetic powder that gives good fluidity is formed, and in combination with the condensation and reduction action by cooling, the chemical A synthetic wood powder that is not formed by reaction or adhesion is formed, passes through the mesh of the screen 129 of the sizing chamber 128, is discharged from the discharge port 131, and is sent to the extruder 70 in the next step.

2. Manufacturing Example of Wood Synthesis Board 2-1. Extrusion process 2-1-1. [Extruder 70] In FIG. 4, reference numeral 70 denotes a single-screw extruder, but generally, the extruder is usually a screw type, and there are a single-screw extruder and a multi-screw extruder. This modification or a structure in which these are combined Any extruder can be used in the present invention.

Reference numeral 71 denotes a screw, which is a single-screw type screw. The screw 71 is driven by a motor (not shown) via a gear reducer 72 and rotates in a barrel 74. The cellulosic crushed material input from the hopper 73 and the thermoplastic resin molding material are kneaded by the rotating screw 71 and extruded forward of the screw 71. A band heater 75 is provided on the outer surface of the barrel 74. The band heater 75 heats the cellulosic crushed material and the resin in the barrel 74, and the resin is crushed by being gradually melted while being transported forward along the groove of the screw 71. Material and resin are kneaded. Then, through the screen 76 and the adapter 77, the material is extruded from the extrusion die 78 of the adapter 77 to the molding die 10 as the extrusion material 79.

The raw materials to be put into the hopper 73 are the crushed cellulosic material and the thermoplastic resin molding material. Especially, the grain size of the wood powder is made to be well compatible with the thermoplastic resin molding material, and the wood powder at the time of extrusion is molded. Wear resistance of the molding machine due to reduced frictional resistance,
In order to prevent damage, it is made into a fine powder form of 50 to 300 mesh, preferably 60 (bottom sieve) to 150 mesh (top sieve), and volatilizes wood acid gas during molding to generate water vapor or bubbles. With the intention of eliminating the above-mentioned problem and preventing the surface from being roughened, the content of water is within 15 wt%, preferably within 11 wt%, and ideally within the range of 3 to 5 wt%.

In order to further improve the properties of such wood powder, a material such as wood chips is immersed in or added to a urea resin adhesive, and after being heated and hardened, it is crushed into 50 to 300 mesh and pulverized into fine powder. In such a method for molding wood flour, the wood acid in the wood flour can be neutralized and volatilized by sufficient heat curing, especially heat curing while neutralizing with the urea resin adhesive. Along with the rapid removal, a hardened adhesive surface is provided on the peripheral surface of the wood powder, which can effectively prevent the water content of the wood powder from increasing, and further improve the sliding property of the wood powder, and increase the friction resistance during molding extrusion. Especially it can be reduced.

The thermoplastic resin molding material is obtained by crushing the above-mentioned discarded various resin moldings as they are or crushing the resin molding having the surface resin coating film into a plurality of small pieces, and by crushing each of the crushed individual pieces. On the other hand, a compression grinding action is added to grind and peel off the resin coating film, and a compression impact force based on microvibration is applied to each of the ground small pieces to crush and crush, and crush and crush. PVC that is used as a thermoplastic resin molding material by removing the resin coating film peeled off at any time
(Polyvinyl chloride), PET (Polyester), PP
(Polypropylene) and other resins.

When the thermoplastic resin molding material is PP, the wood powder is mixed up to 75 wt% at the maximum. The range of the mixing ratio of wood powder is 20 to 75% by weight, preferably 30 to 70% by weight.

The mixed capacity is appropriately determined in accordance with various characteristics such as desired wear resistance characteristics. However, in the present invention, various adverse effects at the time of molding described above are eliminated, so that the mixed capacity is large. Can be mixed.

In the case of PET, wood powder is mixed up to a maximum of 60 wt%, but the mixing ratio of wood powder is preferably 20 to 60 wt%.

When the thermoplastic resin molding material is PVC, the mixing ratio of wood powder is 30 to 60% by weight, preferably 45% by weight.

In the extrusion molding, the recovered thermoplastic resin molding material obtained from the waste material of the thermoplastic synthetic resin product is reused and charged into the extruder, or the virgin thermoplastic resin is charged, or The virgin thermoplastic resin and the recovered thermoplastic resin molding material are each used, for example, 5
It is also possible to add 0% each.

The product may be colored by adding a pigment depending on the purpose of use.

As described above, the fluidized mixing and kneading means is used for gelation and kneading, the gelled kneading material is cooled and granulated by the cooling and granulating means, and the cooled and granulated wood powder is granulated. When the woody synthetic powder of the present invention obtained by sizing to 10 mm or less is put into the hopper 73 of the extruder 70, the woodpowder and the thermoplastic resin molding material are more familiar and the friction of the woodpowder is improved. A good kneaded dough is formed which can reduce drag.

2-1-2. [Extrusion Die] In FIG. 9, 17 is an adapter, which is an inlet 18 through which the extruded dough 79 kneaded by the extruder 70 flows, and an extruding die 19 for discharging the extruded dough 79 to a forming die 10a described later.
It has and. Further, a protrusion having a rectangular cross section is provided at the tip of the adapter 17. The extrusion die 19 has a width of 50 mm so that a thickness of about 8 mm is formed at the tip of the protrusion.
It has an elongated rectangular shape with a height of 12 mm (see FIG. 10), and the inlet 18 has a circular shape with a diameter of 50 mm on the rear end face of the adapter 17, and gradually extends from the inlet 18 toward the extrusion die 19. A communication hole that is deformed in cross section is formed. The inlet 18 is formed to have the same size as the circular outlet of the extruder 70, while the rectangular width of the extrusion die 19 is the inlet 18.
Formed to the same size as the diameter of the
It is preferable to form the same size as the height of the molding chamber 22 of 0a.

The adapter 17 can be formed in various sizes according to the size of the extruder 70. For example, the inlet 18
When the diameter is 150 mm, the width of the rectangle of the extrusion die 19 can be 150 mm, and the height can be 12 mm, which is the same as the height of the molding chamber 22.

The rear end of the adapter 17 is attached to the screen 7 of the extruder 70 via a fitting 28 fitted to the outer periphery of the adapter 17.
6 is connected to the tip end surface of the screen portion 16 with a fixture such as a bolt, and the inlet port 18 of the adapter 17 and the extruder 70 are connected.
To communicate with the outlet of the screen portion 16, and a concave portion having a rectangular cross section is formed at a substantially central position of the rear end surface of the molding die 10a, and a protrusion having a rectangular cross section at the tip of the adapter 17 is mounted in the concave portion. And the introduction hole 12 of the extrusion die 19 and the molding die 10a
Connect a.

A heater 14a as a heating means is embedded in the peripheral wall of the communication hole of the adapter 17.

[Operation in Extrusion Die] The extruded material 79 extruded from the exit of the screen portion 16 of the extruder 70 is
It flows from the inflow port 18 of the adapter 17 and flows from the extrusion die 19 into the introduction hole 12a of the molding die 10a through the communication hole while being heated and kept warm by the heater 14a. The cross-section change of the communication hole from the inflow port 18 to the extrusion die 19 is relatively sharply narrowed. However, since this cross-section change is only the change in the height direction, the flow state of the extrusion dough 79 is not complicated and is good. Is. Moreover, unlike the ordinary die, the extrusion die 19 has a large injection port and is formed into a shape capable of discharging a large amount of molten synthetic wood powder and promoting compaction. The die does not clog as it did.

2-2. Molding process 2-2-1. [Molding Die 10] In FIG. 5, 10 is a molding die having a shape similar to that of a so-called T-die type molding die. Molding having an introduction part 11 for heating and extruding while maintaining the fluidity of the extruded dough 79, and a molding chamber 22 for extruding the extruded dough 79 extruded from the introducing part 11 into a wide plate having a predetermined wall thickness. It consists of a part 21.

The introduction part 11 is provided with an introduction hole 12 and an introduction chamber 13, and from an extrusion die 78 having a circular cross section with a diameter of about 65 mm to a forming chamber 22 having a narrow rectangular cross section with a width of 910 mm and a height of 12 mm. The section is rapidly deformed toward the entrance.
The distance from the extrusion die 78 to the inlet of the molding chamber 22 (distance in the extrusion direction of the introduction part 11) is about 200 mm.

Reference numeral 12 is an introduction hole, which is formed in the molding die 10 in the width direction of the molding die 10 and is bulged to have an elliptical cross section as shown in FIG. It is formed slightly larger, and the shape of its cross section is curved in the width direction of the molding die 10 as shown in FIG. 6, and its both ends reach both ends in the longitudinal direction of the rectangular cross section of the inlet of the molding chamber 22, It is formed in a so-called coat-hanger type, and the extruder 7 is located at a substantially central position in the longitudinal direction of the introduction hole 12.
0 extrusion die 78. In addition, the introduction hole 1
From the 2 to the inlet of the molding chamber 22, there is communicated with the introduction chamber 13 having a triangular cross section in the direction in which the vertical cross section is gradually narrowed.

The introduction hole 12 is formed in a coat-hanger type in which a cross section of the extrusion die 78 of the extruder 70 connects the longitudinal ends of the rectangular cross section of the inlet of the molding chamber 22 with a straight line. Alternatively, it may be formed in a so-called straight manifold type which is formed linearly in the width direction of the molding die 10, but the extruded dough 79 flowing in the introduction hole 12 and the introduction chamber 13 has excellent fluidity. In terms of the presence of the curved coat-hanger type introduction hole 1 described above
2 is particularly preferred.

Further, the introduction hole 12 and the introduction chamber 13 are formed into a triangular vertical cross section in a direction in which the vertical cross section is gradually narrowed from the extrusion die 78 toward the molding chamber without bulging to have an elliptical cross section. Alternatively, as shown in FIG. 8 (A), the structure of the introduction hole 12 and the introduction chamber 13 is simplified, and the introduction hole 12 and the introduction chamber 13 are made equal to the height of the molding chamber 22 together with the inner diameter of the extrusion die 78. The sheet 24 made of fluororesin described below may be attached to the introduction hole 12 and the introduction chamber 13 as well.

Reference numeral 14 denotes a heater, which may be provided on the outer circumference of the peripheral wall of the introduction hole 12 and the introduction chamber 13 by a heating means such as an electric heater, but in the embodiment, the heating effect is excellent.
The extruded dough 79, which is provided in the peripheral wall and flows in the introduction hole 12 and the introduction chamber 13, is heated and kept warm to extrude the extruded dough 79.
Maintain the liquidity of.

The forming chamber 22 is a metal spacer (not shown) in which upper and lower two metal plates respectively having heating and cooling means are arranged on both side edges, and is formed in a rectangular cross section. Adjust so that two or more desired wood synthetic board thicknesses can be obtained by replacement.

A width 910 in the widthwise vertical cross section of the molding die 10.
mm, height 12 mm, forming an elongated rectangular section, forming chamber 2
The distance from the inlet 2 to the die outlet 23 (distance in the extrusion direction of the molding part 21) is 500 mm.

2-2-2. [Molding die 10a] 10a is a molding die having the same shape as the molding die 10 of the above-described embodiment, and the extruding material 79 is extruded while heating and keeping the extruded material 79 while maintaining the fluidity of the extruded material 79. And a molding part 21 similar to the molding die 10 described above.
It consists of and. The introduction portion 11a has a width of 50 mm and a height of 12
A coat-hanger-type introduction hole 12a that undergoes a rapid cross-sectional deformation from an extrusion die 19 having a rectangular shape of mm to an inlet of a molding chamber 22 having a narrow rectangular shape having a width of 900 mm and a height of 12 mm.
The introduction hole 12a is formed by forming the introduction hole 12 and the introduction chamber 13 of the molding die 10 described above in the same height as the molding chamber 22. Others are the molding die 1 of the above-mentioned embodiment.
The same as 0.

2-2-3. Structure inside the molding die The inner wall surfaces of the molding chamber 22 on all four sides are 0.2 mm.
A sheet 24 of 5 mm fluororesin is attached. In addition to this, the fluorine resin can be directly surface-coated on the four inner wall surfaces of the molding chamber 22 in the upper, lower, left, and right directions, but it is easy to replace the fluorine resin, and the fluorine resin coating process is easy and highly durable. It is particularly preferable to attach the resin sheet 24.

The sheet 24 is particularly preferably a glass woven fabric coated with a fluororesin film, and the fluororesin is coated with Teflon T as described above.
FE, Teflon FEP, Teflon CTFE, Teflon V
There are dF and the like. The woven glass fabric may be a non-woven fabric of glass fibers.

The above-mentioned fluororesin coating process can be performed on the upper and lower inner wall surfaces of the molding chamber 22, that is, the inner wall surfaces corresponding to the surfaces forming the front and back surfaces of the molding plate, but as described above. It is desirable to apply it to the entire upper, lower, left, and right inner wall surfaces of the chamber 22.

A cooling pipe 25 is an example of a cooling means for cooling the molding portion 11 of the molding die 10. The cooling pipe 25 is suitable for the extrusion direction of the molding portion 21 in the upper and lower molding dies 10 of the molding chamber 22. The extruded dough 79 in the molding chamber 22 is cooled by supplying water to the cooling pipe 25 as a cooling medium such as water at room temperature or water up to about 70 to 80 ° C. or oil to the cooling pipe 25, which is inserted at intervals. . This cooling pipe is provided in the forming chamber 22 in order to improve the effect of gradually cooling the extruded material 79 in the forming chamber 22.
Cooling pipe 25 from the vicinity of the inlet to the die outlet 23
The cooling pipe 25 may be provided so as to be gradually narrowed, or the cooling pipe 25 may be arranged on the outer wall of the molding portion 11 of the molding die 10.
However, the structure is not limited to the structure of this embodiment.

2-2-4. [Guide Plate] Reference numeral 15 is a guide plate, and in the present embodiment, as shown in FIG. 12, a plane has a short side of about 200 mm, a long side of about 850 mm, and a height of about 100 mm.
Is a plate having a symmetrical trapezoidal shape with a thickness of 7 mm, and a sheet made of fluororesin such as Teflon having a thickness of 0.1 to 0.5 mm is attached to the entire outer surface of the guide plate 15. Note that the outer surface of the guide plate 15 may be directly coated with a fluororesin, and the method of sticking a fluororesin sheet or coating the fluororesin is the sheet 24 provided in the molding chamber 22 of the molding die 10 described above. Is the same as. The guide plate 15 has a height of 12 mm and a width of 900 mm.
The guide plate 1 is located in the center of the guide hole 12a in the width direction of the introduction hole 12a so as to have 25 mm intervals at both ends.
5, the rear end edge of the guide hole 15 is positioned so as to be substantially parallel to the rear end wall surface of the introduction hole 12a, and the guide plate 15 is attached to the forming die 10a.
As shown in FIG. 12, the four bolts 27 are used to introduce the introduction hole 12a.
Fixed to the underside of. Therefore, a gap of 5 mm is formed between the upper surface of the guide plate 15 and the upper surface of the introduction hole 12a.

The guide plate 15 has the same thickness as the introduction hole 1
The guide plate 15 may be formed to have a size of 70% or less of the height of the introduction hole 12a according to the height of 2a, and the width of the guide plate 15 may be about 70 to 95% of the width of the introduction hole 12a. preferable.

Further, the guide plate 15 may be positioned substantially at the center in the height direction of the introduction hole 12a so that the same clearance as the upper and lower surfaces of the introduction hole 12a is provided on the upper and lower surfaces of the guide plate 15. If the guide plate 15 of the present embodiment is positioned substantially at the center of the introduction hole 12a in the height direction, the guide plate 15 is 2.5 in the height direction.
The guide plate 15 is screwed and fixed to the molding die 10a with four stepped pins so that the guide plate 15 is positioned approximately at the center in the height direction so as to form a gap of mm.

2-2-5. Operation in Molding Die [Operation in Molding Die 10] Extruded dough 79 extruded from the extrusion die 78 of the extruder 70 flows in the width direction of the molding die 10 along the introduction hole 12 and, at the same time, flows in the introduction chamber 13. After that, it flows in the extrusion direction in the molding chamber 22. So to speak, Fig. 6
As indicated by the chain double-dashed line, the flow flows in a direction in which the ring expands around the extrusion die 78 of the extruder 70.

At this time, in the introduction section 11, the heater 1
Since it is heated at 4, the fluidity of the extruded dough 79 is maintained, and since the introduction hole 12 and the introduction chamber 13 are high in height and wide in width, the introduction hole 12 and the introduction chamber 1
The extruded dough 79 flowing in 3 is extruded while maintaining a good kneading state. The extruded material 79 has a cross-sectional length of 910.
mm, the height is 12 mm, and the cooling pipe 25 is extruded in the molding chamber 22 having a long and narrow rectangular shape and passes through the molding chamber 22.
A wood synthetic board, which is a molded board 29 as a product having a wall thickness of 12 mm, is molded by being cooled by cooling water flowing inside and solidified.

In the process in which the extruded cloth 79 flows in the molding chamber 22, the sheets 24 made of fluororesin are attached to the inner wall surfaces of the molding chamber 22 in the upper, lower, left, and right directions. Smoothly extruded while being gradually cooled.

The fluororesin has a heat resistance of about 300 ° C., a smooth surface, a small friction coefficient, and a low thermal conductivity coefficient as compared with metal. And operates as shown below.

(1) Since the fluororesin has a smooth surface and a small friction coefficient, the extruded material 7 passing through the molding chamber 22
Especially wood flour in 9 flows without receiving great resistance. Therefore, the kneaded state of the extruded dough 79 is maintained in a good state, and as a result, a high-quality synthetic wood board having a uniform density and having no nests and a smooth surface is produced.

Since the extruded dough 79 is cooled in the molding section 21, the fluidity of the extruded dough 79 is deteriorated, and the wood powder in the extruded dough 79 has a larger frictional resistance than the resin, and the conventional T-die type molding is performed. In the die, since the inner wall surface of the forming die also has a large frictional resistance, the wood powder flowing in contact with the inner wall surface of the forming die receives a large resistance and does not flow smoothly. Although it had a bad influence such as forming a cavity, in the molding die 10 of the present invention, by providing the fluorine resin sheet 24 having a smooth surface and a small friction coefficient on the inner wall surface of the molding chamber 22, Since the wood powder of the extruded dough 79 smoothly flows without receiving a great resistance from the inner wall surface of the molding chamber 22, the extruded dough 7 does not have the above-mentioned adverse effect on the extruded dough 7. It is extruded molding chamber 22 in good kneading state of uniform and high density.

Further, as described above, the resistance of the extruded dough 79 to the wood powder is reduced and the extruded dough 79 is molded with a uniform density. Finishes on a smooth surface without rough skin.

Conventionally, since the wood powder of the extruded dough 79 does not flow smoothly in the molding die, the wood powder is burned and discolored dark brown by the heat of the heater of the molding die, but the present invention is as described above. Further, since the wood powder of the extruded dough 79 flows smoothly, the wood powder is not burnt and the quality characteristics such as impact resistance are not deteriorated.

(2) Since the fluororesin has a lower coefficient of thermal conductivity than metal, it has a slow cooling effect and acts to suppress distortion of the extruded material 79 when it is cooled.

The molding chamber 22 of the molding die 10 is cooled by the cooling water flowing through the cooling pipe 25. However, since the fluororesin has a lower thermal conductivity coefficient than metal, the cooling temperature of the molding chamber 22 is lower than that of the molding chamber 22. Since the heat is not directly and rapidly conducted to the inner wall surface, the extruded material 79 in the molding chamber 22 is not rapidly cooled but gradually cooled. Therefore, the occurrence of a large distortion that occurs when the extruded dough 79 is rapidly cooled is prevented, and the distortion of the wooden synthetic plate that is the molded plate 29 as a product is reduced, and at the same time the surface becomes smooth.

In addition, the molding section 21 of the molding die 10
Since the cooling means such as the cooling pipe 25 is provided in the extruding machine, it is not necessary to cool the molded plate with a cooling roll or the like or to remove distortion with a correction roll after molding, as in the conventional extrusion molding method or calender molding method. The dough 79 is the die exit 23 of the forming die 10.
When it is extruded from the above, a finished product of the wood-made synthetic board with a small internal residual stress is formed. Therefore, according to the extrusion molding method of a wood-based synthetic board of the present invention, distortions such as warpage and twist over time, unlike the wood-based synthetic board formed by the conventional extrusion molding method or calendar molding method, do not occur.

In the extrusion molding method using a so-called T-die type molding die, the extruded dough 79 kneaded by the extruder moves from the relatively small diameter extrusion die 78 to the narrow and elongated rectangular shaped molding portion. In the extrusion molding method using a conventional so-called T-die type molding die, a resin containing a large amount of wood powder is used because it flows in the introduction part that undergoes a sudden cross-sectional change and then flows in a narrow molding part for a relatively long distance. However, the present invention makes full use of the excellent properties of the fluororesin as described above, and thus the present invention extrudes a synthetic wood board containing a large amount of wood powder with a so-called T-die type molding die. It can be performed.

[Operation in Molding Die 10a] When the above-mentioned extrusion die 19 is communicated with the introduction hole 12a of the molding die 10a, the extrusion material 79 extruded from the outlet of the screen portion 16 of the extruder 70 is the same as that of the adapter 17. It flows from the extrusion die 19 into the introduction hole 12a of the molding die 10a through the communication hole while being heated and kept warm by the heater 14a. Since the cross-sectional change of the communication hole is only in the height direction, the flow state of the extruded material 79 is not complicated. Next, since the height of the introduction hole 12a is the same as the height of the molding chamber 22 and the cross-sectional change in the introduction hole 12a is only the change in the width direction, the molding die 10a
The flow state of the extruded material 79 in the introduction hole 12a is more complicated than that of the introduction hole 12 and the introduction chamber 13 having the cross-sectional changes in both the height direction and the width direction like the molding die 10 of the above-described embodiment. Absent. Therefore, the flow condition of the extrusion material 79 in the introduction holes 12a of the extrusion die 19 and the molding die 10a is much better. Others are the same as the operation of the molding die 10 described above.

[Operation in Molding Die with Guide Plate] Further, when the guide plate 15 is provided in the introduction hole 12a, the flow of the extruded dough 79 discharged from the extrusion die 19 of the adapter 17 is indicated by the arrow in FIG. As shown, the extruded material 79 hits the rear end surface of the guide plate 15, and the extruded material 79 then passes through the flow path formed between the rear edge of the guide plate 15 and the rear wall surface of the introduction hole 12a to both sides in the width direction of the introduction hole 12a. Then, a part of the extruded material 79 in this flow path advances toward the molding chamber 22 through the gap between the guide plate 15 and the upper wall surface of the introduction hole 12a. Therefore, by providing the guide plate 15 in the introduction hole 12a, the flow state of the extruded dough 79 becomes a relatively simple flow, and depending on the raw material, the extruded dough 79 has different lines at the central portion and the end portion in the extruding direction. It is prevented from expanding and different molecular orientations, homogenizing linear expansion, controlling the molecular orientation, and evenly diffusing into the molding chamber 22 of the molding unit 21,
In the molding die 11a which is extruded with a uniform density, the molding portion 21
Is evenly diffused into the molding chamber 22 and is extruded with a more uniform density.

Further, since the fluororesin sheet is stuck on the surface of the guide plate 15, the resistance to the extruded cloth 79 passing through the surface of the guide plate 15 is small, so that the extruded cloth 79 has a particularly large frictional resistance. Since the wood powder smoothly flows on the surface of the guide plate 15 without receiving a large resistance, the extruded material 79 is extruded into the molding chamber 22 of the molding die while maintaining a uniform and high-density kneaded state.

In particular, when the extrusion molding of the present invention is carried out using the woody synthetic powder of the present invention, since the resin is attached to the entire surface of each woody powder, the extruder 70 is used.
Since the extruded dough 79 in a well-kneaded state in which the resin is evenly penetrated between the individual wood flour is formed therein, the wood flour in this extruded dough does not receive a large resistance particularly on the wall surfaces in the extruder and the molding die. It flows smoothly and forms a more uniform and dense wood synthetic board.

Further, the molding plate 29 extruded from the die outlet 23 of the molding die by the braking means of the embodiment described later.
Since a resistance force is applied in the direction opposite to the extrusion direction, a high-density and uniform wood synthetic board is formed.

2-3. Suppression of extrusion of molded plate 2-3-1. [Brake Means 30] A braking force is applied to the forming plate 29 extruded from the die exit 23 of the forming die 10 by the braking means 30 in the direction opposite to the extruding direction to suppress the extruding force of the forming plate 29. Hereinafter, an embodiment of the braking means 30 will be described with reference to the drawings.

In FIG. 5, 31 is a pinch roller, which is a rubber roller, and the total length of the front and back surfaces of the molding plate 29 is determined by a pair of fixed pinch rollers 31a and a free pinch roller 31b.
It is abutted in the state of being sandwiched by. Fixed pinch roller 31
As shown in FIG. 6, both ends of the shaft 32 of the a and the free pinch roller 31b are supported by bearings 34, 34, respectively.

Bearings 3 at both ends of the fixed pinch roller 31a
Reference numerals 4 and 34 are fixed to a bearing fixing frame 36, and two guide shafts 38 and 38 are erected on the bearing fixing frame 36 on both sides of the bearing 34, as shown in FIG. The springs 43, 43 are fitted into the guide shafts 38, 38, respectively.

The bearings 34, 34 at both ends of the free pinch roller 31b are fixed to a freely movable bearing free frame 37, and through holes are provided at both ends of the free bearing frame 37, and the guide shaft 38 is provided in the through holes. , 38 through which the bearing-supporting frame 37 abuts against the springs 43, 43.

The axis of the fixed pinch roller 31a and the axis of the free pinch roller 31b are located on the lines parallel to the guide shafts 38, 38, respectively, and the molding plate 29 is provided with the outer peripheral surface of the free pinch roller 31b and the fixed pinch roller. 31a
A free pinch roller 31b is provided so as to be able to come into contact with and separate from the fixed pinch roller 31a so as to be positioned in a substantially tangential direction of the outer peripheral surface of the.

The springs 43, 43 are compression springs,
The springs 43, 43 urge the bearing-free frame 37 in a direction to form a gap into which the molding plate 29 can be inserted between the fixed pinch roller 31a and the free pinch roller 31b. Further, the compression springs 4 each having a strength greater than that of the spring 43 from the tips of the guide shafts 38, 38.
4 and 44 are fitted and inserted into the tips of the guide shafts 38 and 38 so as to press the springs 44 and 44.
Is screwed, and the bearing free frame 37, that is, the free pinch roller 31b is urged in a direction of being pressed against the fixed pinch roller 31a. In this way, the free pinch roller 31b is provided so as to come into contact with and separate from the fixed pinch roller 31a. Note that the bearing free frame 37 may be directly pressed by the nuts 49, 49 without providing the spring 44.

Further, the shaft 32 of the fixed pinch roller 31a.
Brake drums 33 having V-grooves fitted to the brake belts 35 are provided on both ends of the brake drums 35, and friction bodies such as the brake belts 35 are wound around the V-grooves of the brake drums 33 about half a turn. The brake belt 35 has a brake belt holder 39 provided at one end thereof, and the bearing fixing frame 3
6 is supported by a shaft 41 fixed to a fixed plate 42, a brake tensioner 40 with a flange is provided at the other end of the brake belt 35, and the tip of the brake tensioner 40 is fixed to the fixed plate 42 by a tension bracket 46.
The brake tensioner 40 is eccentrically supported by a tensioner 47 having a lever 48 at the tip of the brake tensioner 40.

A spring 45 is provided between the flange of the brake tensioner 40 and the tension bracket 46 for urging the brake belt 35 wound around the brake drum 33 in a loosening direction. When the tensioner 47 is rotated by rotating the lever 48 in the counterclockwise direction in FIG. 7, the tensioner 47 is eccentrically supported, so that the brake tensioner 4 resists the urging force of the spring 45.
7, the brake belt 35 is pulled downward in the plane of FIG.

That is, since the brake belt 35 is pulled in the direction of fitting in the V groove of the brake drum 33,
The brake belt 35 is fitted in the V groove of the brake drum 33 to suppress the rotational force of the brake drum 33. Also,
When the tensioner 47 is rotated clockwise by the lever 48 in FIG. 7, the brake tensioner 40 pushes the brake belt 35 upward in the plane of FIG. And the suppression of the rotational force of the brake drum 33 is released.

The V groove of the brake drum 33 and the brake belt 35 are set in accordance with the rotation stop position of the tensioner 47.
Brake drum 33 becomes loose or tight
The force that suppresses the rotational force of is adjusted.

Instead of the tensioner 47, a tightening nut is screwed on the tip of the brake tensioner 40, and this tightening nut is turned to set the V groove of the brake drum 33 and the brake belt 35 in a fitted state. It is also possible to adjust and adjust the suppressing force of the rotational force of the brake drum 33.

In this embodiment, the pair of fixed pinch rollers 31a and the free pinch roller 31b are arranged at appropriate intervals in the pushing direction of the molding plate 29 as shown in FIGS. 5 and 6. Although three pairs of pinch rollers 31 are provided, the number is not limited to this and any number of pairs may be used as long as the function is achieved.

Further, in this embodiment, the fixed pinch roller 3
Although the above-described braking means 30 is provided at both ends of 1a, it may be provided only at one end of the fixed pinch roller 31a. However, from the viewpoint of reliably suppressing the rotational force of the fixed pinch roller 31a, it is preferable to provide the braking means 30 at both ends of the fixed pinch roller 31a.

As another embodiment of the braking means 30, a brake plate having a length that extends over the entire width of the molding plate 29 in the width direction is provided on the front and back surfaces of the molding plate 29 so that they can be pressed and separated from each other. Forming plate 2 by pressing the front and back surfaces of forming plate 29
The extrusion force of 9 can be suppressed. The brake plate may be formed by fixing a plate-shaped elastic body such as rubber or resin to a steel or wooden frame, and contacting the surface of the elastic body with the molding plate 29. It should be noted that any number of pairs of braking means 30 composed of a pair of these brake plates may be provided.

[Operation by Suppressing Extrusion of Forming Plate] The nuts 49, 49 are tightened against the urging force of the springs 43, 43, and the free-bearing frame 37 is moved downward through the springs 44, 44 in the plane of FIG. By pressing, the free pinch roller 31b is brought into pressure contact with the fixed pinch roller 31a via the forming plate 29. The fixed pinch roller 31a and the free pinch roller 31b rotate in the direction of the arrow in FIG. 5 by the pushing force of the forming plate 29.
The brake drum 33 rotates as the fixed pinch roller 31a rotates.

The lever 48 is rotated counterclockwise in FIG. 7 to rotate the tensioner 47, and the brake belt 35 is moved downward through the brake tensioner 40 against the urging force of the spring 45. Pull to, brake drum 3
By suppressing the rotational force of the molding die 3, the molding plate 29 extruded from the die outlet 23 of the molding die 10 is moved to the pinch roller 31.
The pushing force of the molding plate 29 inserted between the fixed pinch roller 31a and the free pinch roller 31b and sandwiched between the fixed pinch roller 31a and the free pinch roller 31b is suppressed.

As shown by the two-dot chain line arrows in FIGS. 5 and 6, the fixed pinch roller 31a and the free pinch roller 31b generate a suppressing force against the pushing force of the molding plate 29, and this suppressing force is generated. A force in the direction opposite to the extrusion direction is applied to the extrusion material 79 in the forming section 21 and the introducing section 11. Since the extruded dough 79 is in a state of being rich in fluidity before being cooled, the extruded dough 79 discharged from the extrusion die 78 as shown by the one-dot chain line in FIG.
It is extruded in a state of being expanded in the width direction of the molding die 10 rather than in the extruding direction, and in a state in which the density of wood powder is extremely high.

When the above-mentioned restraining force is not applied to the forming plate 29 obtained by the above-described extrusion molding method for the wood-based synthetic plate of the present invention, the extruded dough 79 flows in the extruding direction as shown by the chain double-dashed line in FIG. Since the ratio is large, comparing the case where no restraining force is applied to the molding plate 29 and the case where the restraining force is applied to the molding plate 29 as described above, it is noticeable in the flowing state of both extruded dough 79. You can see the difference.

The method of molding the wood-based synthetic board of the present invention when a suppressing force is applied to the molding plate 29 is as follows:
The density of the wood powder in the extruded dough 79 is further increased, and the wood-synthesized board, which is the molding board 29 as a more uniform and high-density product over the entire width direction of the molding die 10, is molded. The extruding speed when a suppressing force is applied to the forming plate 29 is 4 to 5 m per hour.

Therefore, conventionally, the extruded material 7 is extruded into the forming die 10 having a sharp cross-section change from the extrusion die 78 having a relatively small diameter into the forming chamber 22 having a wide and elongated rectangular cross section.
Although it was a difficult problem to extrude 9 in a high-density and uniform kneaded state, in the method of molding a wood-based synthetic board of the present invention, in addition to the case where no restraining force is applied to the molding board 29,
By the method of applying a restraining force to the forming plate 29 in the direction opposite to the extruding direction by the braking means 30, it becomes possible to form a more dense and uniform wooden synthetic plate.

2-3-2. [Brake Means 30a] With respect to another embodiment of the brake means, the same members as those in the above-described embodiment of the brake means 30 will be described below with the same reference numerals.

In FIGS. 13 and 14, bearings 34a that support both ends of the shafts of the three free pinch rollers 31b are respectively fixed to the bearing fixing frame 36, and the fixed pinch rollers 31a and the gear 116 provided on each shaft. , This gear 11
The input shaft of the powder brake 115 is connected to the shaft of one fixed pinch roller 31a among the three fixed pinch rollers 31a in cooperation with the gear 117 meshing with the gear 6. The powder brake 115 is a so-called electromagnetic brake, and can electrically finely adjust the friction torque.

Further, the frame 114 is erected on the bearing fixing frame 36, and two block-shaped guide bodies 119 each having a guide groove are provided on the wall surface of the frame 114, and the axial direction of the 119 is directed vertically. Bearings 34b, which are provided substantially parallel to each other and support both ends of the shafts of the three free pinch rollers 31b, are vertically movable along the guide grooves of the guide body 119, and the bearings 34b are respectively provided on the upper surface of the frame 114. Are connected to the tips of the rods of the three air cylinders 118 provided in the.

Therefore, by operating the cylinder 118, each of the three free pinch rollers 31b is pressed against the fixed pinch roller 31a via the forming plate 29, and one of the three fixed pinch rollers 31a is fixed pinch roller 31a. Three
The rotation of the shaft 1a is suppressed by the powder brake 115, and the gear 11 provided on the shaft of the fixed pinch roller 31a.
6 meshes with the gears 116, 116 provided on the shafts of the other two fixed pinch rollers 31a, 31a via the gears 117, 117, so that the friction of the powder brake 115 with the three fixed pinch rollers 31a. The same rotation suppression force by the torque acts.

Incidentally, the pressure of the cylinder 118 applied to each fixed pinch roller 31a is adjusted by the plate thickness of the forming plate 29 to be formed. Similarly, the friction torque for suppressing the rotation of the fixed pinch roller 31a by the powder brake 115 is also adjusted by the plate thickness of the forming plate 29 to be formed.

For example, in this embodiment, when the thickness of the molding plate 29 is 12 mm, the air pressure of the cylinder 118 is 3.5-4.
With kg / cm ² , one free pinch roller 31b is used for forming plate 29.
The load applied to the fixed pinch roller 31a via
It will be 000 kg. Therefore, a total load of 3,000 kg is applied to the molding plate 29 by the three free pinch rollers 31b, and the friction torque of the powder brake 115 is 10 kg / m.

When the thickness of the forming plate 29 is 30 mm, the air pressure of the cylinder 118 is 8 to 10 kg / cm ² , and the load applied by the single pinch roller 31b to the fixed pinch roller 31a is about 2,000 kg. . Therefore, a total load of 6,000 kg is generated by the three free pinch rollers 31b.
In addition, the friction torque of the powder brake 115 is 20 kg / m.

Therefore, the friction torque of the powder brake 115 serves as a restraining force against the pushing force of the molding plate 29,
Extruded dough 7 in the introduction part 11 of the molding dies 10 and 10a
9 is made into a more dense and uniform state, and this uniform and high-density extruded dough 79 is extruded by the extruder 70.
Is pushed forward against the restraining force of the brake means 30a, cooled in the forming chamber 22 and the forming plate 29 is formed. The forming plate 29 advances while rotating the fixed pinch roller 31a and the free pinch roller 31b against the restraining force of the powder brake 115.

As described above, the braking means 30 of this embodiment
a is the cylinder 1 depending on the thickness of the forming plate 29 to be formed.
18, the pressing force of the free pinch roller 31b can be easily adjusted, and the suppressing force of the fixed pinch roller 31a can be easily adjusted by the powder brake 115.
It is preferable to the braking means 30 of the above-described embodiment.

After that, the wooden synthetic board which is the molded board 29 as the product is cut to a desired length by a cutting machine such as a cutter, a shearing machine, a saw machine, or the like. A cutting machine such as a cutter is used for the thin molded plate 29, and a shearing machine or a saw machine is used for the thick molded plate 29 of 12 mm or the like.

FIG. 8B shows still another embodiment of the present invention intended to improve the production capacity. One extruder 7 is shown in FIG.
The molding dies 10, 10 having substantially the same structure as in FIG. 8A are connected to the extrusion die 78 from 0.

3. Manufacturing Example 3-1. Example of production of synthetic wood powder In this example, 55 wt% of the raw material has an average particle size of 20 mesh or less and a bulk specific gravity of 30 kg of wood flour (at this time, the wood flour contains about 8 wt% of water) and wood acid. 0.3 kg of a 40% aqueous solution of urea such as ammonia, phenol, melamine, etc., which is a gas neutralizer (the ratio of urea to wood flour is 1 wt%
3 kg of calcium carbonate and the remaining 45 wt.
% Is 2 (PP) of thermoplastic resin molding material
It consists of 7 kg.

The average particle size of the wood flour means a particle size of 50 weight percent of the cumulative weight percent distribution of the wood flour.

The step of kneading with the above mixer 80 will be described in detail below. (1) Rotate the motor to rotate the stirring impact blades 85, 86, 87 and scraper 84 at high speed, open the upper lid 82, throw in 30 kg of wood powder from the charging port 94, and add 0.3 kg of the urea little by little. .

(2) After about 1 minute, 3 kg of 5 to 10 wt% calcium carbonate is added and kneaded for about 10 to 20 minutes. When these calcium carbonate and titanium oxide are added, the specific gravity of the raw material becomes heavy, so that the shearing force by the stirring impact blades rotating at high speed becomes high, so that the generation of frictional heat due to the shearing force is improved, and the temperature in the mixer 80 is 180- When it reaches 190 ° C and is dried, the water content of the raw material is 1 wt% or less, preferably 0.3 wt
% Or less. By the way, in this example, the temperature in the mixer body 81 was 190 ° C. and the water content of the raw material was 0.1 wt% 17 minutes and 09 seconds after the wood powder was charged. The wood powder is crushed by the high-speed rotation of the stirring impact blades 85, 86, 87, and a large amount of steam or wood acid gas generated from the wood powder at this time is exhausted from the gas exhaust pipe 9 provided on the upper lid 82.
It is discharged from 5.

(3) Next, PP of thermoplastic resin molding material
25 kg of (polypropylene) is put into the mixer main body 81 and kneaded for 5 to 8 minutes (kneading for about 8 minutes in this embodiment). The thermoplastic resin molding material used in the present embodiment is a granular pellet having a diameter of about 3 mm.

The melting point of PP of the thermoplastic resin molding material was 165 ° C., and the temperature in the mixer body 80 in this step was 186 ° C.

In this step, PP does not become a large lump due to the wood powder in the raw material, and does not aggregate even when mixed and dispersed, and gels into a clay like lump, which is a lump-shaped "kneading material" having a diameter of about 10 to 100 mm. Became. In other words, this lump is a lump in which individual wood flour is formed with the thermoplastic resin adhered to the entire surface of the individual wood flour, and these individual wood flours are aggregated. There is no adhesion and the lump itself is brittle. Therefore, the kneading material formed by this step is a good material that can be kneaded more efficiently in the later-described extruder 70, and is a good material that particularly reduces the friction resistance of wood powder during extrusion molding. is there.

Further, in the case of the present production example in which the thermoplastic resin molding material is PP, when the wood powder is 35 wt% or less of the total amount of the raw material, the thermoplastic resin molding material becomes a large lump in the mixer 80, and therefore the wood powder Should be greater than 35 wt%.
Further, the gelling of the raw material is possible up to 75 wt% of the wood powder, and it is impossible because the wood powder is burned when the wood powder exceeds 75 wt%.

(4) Reduce the speed of the motor to the cylinder 91
Is operated to retract the lid 89 to open the discharge port 88. The gelled raw material in the mixer body 81 is discharged from the discharge port 88 through the discharge duct 93 to the next step. The temperature at the time of discharging was 186 ° C., and the entire process from the charging of the raw materials to the discharging was processed in 26 minutes 54 seconds.

If the speed of the motor is lowered to a temperature about 10 ° C. higher than the melting point of the thermoplastic resin molding material in the raw material, the kneading material in the mixer 80 is cooled, and the kneading material having a diameter of about 25 mm or less is cooled. Granules are granulated to form granulated wood flour. In this case, the treatment by the cooling granulation means in the next step may be omitted and the particle size may be adjusted to 10 mm or less by the particle size control means in the subsequent step to form the synthetic wood powder.

Another manufacturing example will be shown below. As raw materials, 64 wt% of the raw materials has an average particle size of 20 mesh or less and a bulk specific gravity of 26 kg of wood powder, 0.3 kg of a 40% concentration aqueous solution of urea, and 3 kg of 5 to 20 wt% titanium oxide.
The remaining 36 wt% is PC, which is a thermoplastic resin molding material.
It consists of 16 kg (polycarbonate). When this raw material is kneaded in the mixer 80, the same steps as those in the above-described embodiment are performed, and 17 minutes and 30 seconds after the wood powder is charged into the mixer main body 81, the PC is charged at 159 ° C. for about 26 minutes. After 14 minutes, the kneaded material that gelled at 223 ° C. was discharged.

(5) Cooling Granulation The kneading material formed by the mixer 80 described above passes through the discharge duct 93 and the charging port 113 of the cooling mixer 100.
Is charged into the mixer main body 101 from. Stirring crushing blade 1
The motor 04 rotates at a speed of 90 rpm by the motor 105, and the arm 103 rotates horizontally at a speed of 3 rpm.

The kneading material is cooled on the inner peripheral wall surface of the mixer main body 101 cooled by the cooling water in the jacket 102 to form "granulated wood powder" granulated to a diameter of about 25 mm or less. For powder, open valve 106 and discharge port 1
It is discharged from 07.

[0184] The melting point of PP is 165 ° C. In this manufacturing example, the kneading material gelled at 180 ° C in the mixer 80 described above is charged into the cooling mixer 100 for 10 to 10 minutes.
It is cooled to 90 to 100 ° C. in about 15 minutes, and the cooling granulation by this cooling mixer is efficient. Regarding the cooling water in the jacket 102 at this time, the water supply pipe 10
The temperature of the cooling water supplied from 8 is 30 ° C, and the drain pipe 109
The temperature of the drained cooling water is 40 ° C.

(6) Grain sizing The granulated wood powder formed by the cooling granulation means is further sized to a particle size of 10 mm or less using a cutter mill to form a "wood synthetic powder".

Granulated wood powder is the rotary blade 1 of the cutter support 124.
25 to the fixed blade 126 is cut into wood synthetic powder of about 0.1 to 8 mm to form “wood synthetic powder”, which passes through the mesh of the screen 129 of the sizing chamber 128 and is discharged from the discharge port 131.

3-2. Comparative example of wood synthetic board using wood synthetic powder Wood synthetic board of the present application (sheet thickness 12.0 mm) consisting of 50% of wood powder and 50% of PP resin (hereinafter referred to as "this application example A")
And plywood A (thickness 11.2 mm) with three layers of wood
And plywood B with 5 layers of wood laminated (11.6 mm thick)
And plywood C with 7 layers of wood laminated together (thickness: 15.3 mm)
Then, the following physical property tests were conducted.

(1) Bending elastic modulus and bending strength test Test conditions: fulcrum spacing: 100 mm, test speed: 5 mm
/ min

[0189]

[Table 1]

From the above, in comparison with the bending elastic moduli and bending strengths of the plywood A and the plywood B in the longitudinal direction and the transverse direction, both of the values in the example A of the present application are lower than those of the plywood A and the plywood B. Compared with C, the bending strength (longitudinal direction) of plywood C is 29.1 MPa, whereas the bending strength (longitudinal direction) of Example A of the present application is a little lower at 27.5 MPa, but this example A The values are relatively close to each other, and the bending elastic modulus (longitudinal direction) of plywood C 1 is 1.98 GPa, whereas the bending elastic modulus (longitudinal direction) of Example A of the present invention is 2.73 GPa, and plywood C 2 The flexural modulus (horizontal direction) is 1.64 GPa, whereas the flexural modulus (horizontal direction) of Example A of the present invention is 2.51 GPa.
And the bending strength (lateral direction) of plywood C is 27.5 MPa.
On the other hand, the bending strength (transverse direction) of Example A of the present invention is 2
It is 8.2 MPa, and in each case, the example A of the present application shows a high numerical value with respect to the plywood C.

Therefore, the good results that the wood-synthesized board of the present invention exhibits the bending elastic modulus and bending strength equivalent to those of a certain kind of plywood were obtained.

(2) Surface impact test Test condition: 10 m / sec

[0193]

[Table 2]

From the above, the surface impact value of Example A of the present application is
The values were higher than those of plywood A, plywood B, and plywood C.

(3) Hardness test Test conditions Rockwell hardness indenter; diameter 12.70
0mm steel ball test load; 60kgf

[0196]

[Table 3]

From the above, the Rockwell hardness of Example A of the present application was higher than that of any of plywood A, plywood B and plywood C. The wood-based synthetic board of the present invention is about 1.4 with respect to plywood A.
It has excellent hardness of about 1.93 times that of plywood B and about 3.34 times that of plywood C.

(4) Hydration Test Test Conditions Each test piece was immersed in pure water and kept at 25 ° C. for 24 hours.
The mass change rate (= water content) after standing for a time was measured.

[0199]

[Table 4]

From the above, the water content of Example A of the present application was much lower than that of any of plywood A, plywood B and plywood C. If the water content changes easily, the rate of change of expansion and contraction of the plate will increase, which means that the dimensional change of the plate will increase due to environmental changes such as humidity, which will easily cause cracking and dimensional deviation of the plate. .

The wood-based synthetic board of the present invention has a 1 / third ratio even for the plywood A having the lowest water content among the above three kinds of plywood.
Since it has an extremely low water content of 153,
It has extremely high dimensional stability without being affected by environmental changes such as humidity.

(5) Nail pull-out strength test Test conditions Test speed: 5 mm / min

[0203]

[Table 5]

From the above, the nail pull-out strength of Example A of the present application was lower than any of plywood A, plywood B and plywood C. Generally, the low nail pull-out strength of the wooden synthetic board is a peculiar weak point of the wooden synthetic board. It is considered that the pull-out strength of the nail is expressed by the frictional force of the tissue of the plate around the nail as the pull-out strength when pulling out the nail, and in the case of a wooden synthetic board, the frictional resistance that weakens the pull-out strength of the nail. Since a small amount of resin is contained, it is naturally conceivable that the value will be lower than the pull-out strength of the nail of the plywood made of a wood plate having a large friction resistance. However, the example A of the present application is plywood C
Good results were obtained, having a strength of about 72% of the nail pull-out strength.

In the case of the wood synthetic board, the nail pull-out strength is increased by increasing the density between the individual wood powders, and since the sample A of the present application has a high density, good results are obtained as described above. It is thought that

(6) Wood screw test Test conditions Test speed: 5 mm / min

[0207]

[Table 6]

From the above, the pull-out strength of the wood screw of Example A of the present application was higher than that of any of plywood A, plywood B and plywood C. Further, the hooking strength of the wood screw of Example A of the present application was higher than that of plywood A, plywood B and plywood C both in the longitudinal direction and in the transverse direction.

It is considered that the pulling strength of the wood screw is different from the frictional force of the tissue of the plate around the nail as in the pulling strength of the nail, and is related to the shearing force of the tissue of the plate.
In other words, in the case of a wood synthetic board, it is considered that the close contact between the board tissue of the part that bites into the screw and the other tissue reflects the strength of the pulling strength of the wood screw.

In the wood-based synthetic board of the present invention, since the wood powder is uniform and has a high density, the adhesion between individual wood powders is strong, and as shown in Example A of the present application, the wood screw pull-out strength and the wood screw hooking strength are high. Excellent results were obtained, which was higher than each plywood.

As shown by the results of each of the above tests, the wood-based synthetic board of the present invention is close to some of several kinds of plywood in bending elastic modulus, bending strength, and nail pull-out strength. It is excellent in that it has characteristics, and is superior to plywood in surface impact value, water content, wood screw pull-out strength and wood screw pulling strength.

3-3. Other examples of wood-based synthetic board production

[0213]

[Table 7]

[0214] The wood-made synthetic board W: 910 mm, H: 12 mm, which is the molded board 29 as the above product, is made 182 by a sawing machine.
It was cut at intervals of 0 mm to obtain a wooden synthetic board having a weight of 18 kg and used as a beige cochleate panel. In addition, wall thickness 1
The wood synthetic board of about 0 to 12 mm is also used for other purposes such as furniture materials such as desks, tables and cupboards.

The height of the molding die 10 is 20 to 30 mm.
By this, a wood synthetic board having a wall thickness of 20 to 30 mm is formed, and this wood synthetic board is used as a cutting board or a board material for other purposes. Therefore, the wall thickness of the wood synthetic board to be formed is not limited to the above-mentioned embodiment.

[0216]

[Table 8]

[0217] The wooden synthetic board W: 910 mm, H: 3 mm, which is the molded plate 29 as the above product, is cut into every 1820 mm by shirring to obtain a wooden synthetic board having a weight of 4.5 kg.

Such a thin plate is a material for a wide range of purposes such as various building materials, furniture materials, equipment parts and the like. For example, the above-mentioned thin wooden synthetic board is used as a building material such as a decorative board for interior decoration of a house, or is processed into a size of about 300 mm square and used as a flooring material such as a flooring block. Further, as another application, as an interior material of the interior of the automobile, for example, used as a decorative plate around the meter panel of the driver's seat, a decorative plate around the transmission, and other decorative walls of the vehicle interior wall,
You can get a sense of quality. As equipment parts, it is used as a box panel for electric equipment and a decorative plate for other equipment.

Therefore, according to the extrusion molding method of the present invention, it is possible to mold a wide range of wall-thickness synthetic wood boards ranging from thin boards to thick boards, and materials for a wide range of purposes are molded.

Since the wood synthetic board formed by the extrusion molding method of the present invention has a high density, a large amount of wood powder can be mixed in, and the wood powder is less than half the price of thermoplastic resin and is much cheaper, so it is inexpensive. A wood synthetic board is formed. Also. A wood-based synthetic board mixed with a large amount of wood flour is an excellent board having properties close to those of a natural wood panel.

The wood-synthesized board of the present invention can be subjected to hot press-molding again by press-heating-cooling demolding. However, the wood synthetic board produced by the extrusion molding method of the present invention has less internal residual stress as compared with the conventional calender molding method or extrusion molding method, and therefore does not cause distortion more than expected.

[Aspects of the Present Invention] The following will describe other aspects of the present invention, although not limited thereto. The introduction hole is a so-called straight manifold type extruder in which both ends of a rectangular cross section of a rectangular cross section from the extruder discharge port to the molding chamber inlet are formed in a straight line in the width direction of the molding die. The forming chamber is composed of a forming die formed in a rectangular cross section through metal spacers having upper and lower two metal plates respectively provided with heating and cooling means arranged on both side edges.

An extruder in which a non-woven fabric of glass fibers or a woven fabric of glass is coated with a fluororesin film sheet on the inner wall surface of the molding chamber.

[0224]

Since the present invention is constructed as described above, it has the following effects.

(1) Since the wood-based synthetic powder of the present invention is made into a powder form in which the crushed cellulose material has an average particle size of 20 mesh or less, it is well compatible with the thermoplastic resin molding material, and when it is gelled and kneaded. Since the thermoplastic resin molding material adheres to the entire surface of the cellulosic crushed material without agglomeration even when mixed and dispersed, the so-called thermoplastic resin molding material is fixed to thermally and chemically stable wood powder particles. In order to maintain a stable state, the wood powder and thermoplastic resin molding material are mixed, and in order to maintain a stable dispersion state, a synthetic wood powder that gives good fluidity is formed and cooled. Combined with the condensation and contraction effects of the wood, synthetic wood powder is formed without chemical reaction or adhesion, and using this synthetic wood powder, an extruded dough in a good kneading state is formed, and the cells at the time of molding extrusion are formed. Reduce the frictional resistance of over scan system crushed,
It was possible to prevent wear and damage of the molding machine, and contributed to molding a uniform and high-density synthetic wood board. Moreover, in the past, a cellulosic crushed product crushed to a particle size of 80 to 300 mesh and pulverized was used, but in the present invention, a wide range of particles having an average particle size of 20 mesh or less is used. It was possible to provide a synthetic wood powder that can use a cellulosic crushed product of a diameter.

Further, since the wood-based synthetic powder of the present invention has a water content of 15% by weight or less in the cellulosic crushed product, it volatilizes wood acid gas at the time of gelation kneading and molding to reduce generation of steam or bubbles. , It was possible to prevent the surface roughness.

Further, since the wood-based synthetic powder of the present invention is sized to 10 mm or less, it is possible to prevent sticking at the time of molding extrusion, and reduce friction resistance of the wood-based synthetic powder to prevent wear and damage of the molding machine. I was able to plan.

(2) The method for producing a woody synthetic powder of the present invention is as follows:
25-80 wt% of a thermoplastic resin molding material is mixed with 20-75 wt% of a cellulosic crushed material having an average particle size of 20 mesh or less with a water content of 15 wt% or less, and gelled by frictional heat by mixing with a stirring impact blade. Since the cellulosic crushed material is 20 to 75 wt% at the time of kneading and this gelling and kneading, the thermoplastic resin molding material does not form a large lump of the material to be kneaded, and the thermoplastic resin molding material can be used on the entire surface of the individual cellulosic crushed material. It is characterized by including at least the steps of adhering to, gelling in a relatively small state, then cooling, crushing, and sizing to a particle size of 10 mm or less, so that good woody materials as described in (1) above can be obtained. A synthetic powder could be formed.

(3) The apparatus for producing a woody synthetic powder of the present invention is
A fluid mixing and kneading means provided with a stirring impact blade by mixing together 20 to 75% by weight of a thermoplastic resin molding material with 20 to 75% by weight of a cellulosic crushed material having a water content of 15% by weight or less and an average particle size of 20 mesh or less. The thermoplastic resin molding material adheres to the entire surface of the individual cellulosic crushed materials by frictional heat from the raw materials and can be gelled and kneaded in a relatively small state, has a stirring and crushing blade inside, and has an inlet for cooling water in the jacket. In the cooling and granulating means having an outlet, the gelled kneaded material is efficiently cooled and granulated, and in the particle sizing means, the cooled and granulated granulated wood powder is sized to a particle size of 10 mm or less. It was possible to produce a good woody synthetic powder as shown in the section (1).

(4) The good synthetic wood powder as described in the above item (1) is heated and kneaded, and the extruded dough extruded to the forming die by the screw is gradually cooled, and the extruded dough is extruded with a force of extruding. A wood-based synthetic board molded by an extrusion molding method, in which the density of the extruded fabric is increased by applying an anti-suppressive force,
The extruded dough that has been heated and kneaded has the thermoplastic resin molding material evenly permeated between the individual cellulosic crushed materials. In a good kneading state, and with reduced frictional resistance of the cellulosic crushed materials, form the molding die. Since it is extruded and exerts a restraining force against the extruding force on this extruded material, it is a uniform and high-density synthetic wood board.

(5) A crushed cellulosic material is mixed in a thermoplastic resin molding material in an amount of 20 to 75 wt%, heated and kneaded, and extruded into a molding die with a screw, and the extruded material is a fluororesin sheet on the inner wall surface. Since it is extruded to a molding portion of a molding die which is pasted or coated with a fluororesin and molded into a predetermined wall thickness and gradually cooled in the molding portion, the fluororesin has a slow cooling effect due to its low thermal conductivity coefficient. result,
It was possible to reduce the distortion that occurs when the extruded dough cools. Therefore, it was possible to mold a high-quality wood-based synthetic board with a small internal residual stress that does not require correction such as correcting the formed board with a correction roll or the like.

(6) Since the fluororesin has a small friction coefficient, the resistance of the extruded material to the cellulosic crushed material can be reduced, and the cellulosic crushed material and the thermoplastic resin molding material flow in a good kneading state. Therefore, it was possible to directly form a wide, uniform and high-density synthetic wood board of high quality by extruding from a molding die in a good kneading state.
For this reason, a thick wood synthetic board is directly
It could be extruded.

Further, since the flow rate of the cellulosic crushed material is good, the flow rate of the cellulosic crushed material is slowed as in the conventional case and the cellulosic crushed material is not burned by the heat of the heater of the molding die. Therefore, the formed wood-based synthetic board did not turn dark brown, and it was possible to prevent deterioration of quality characteristics such as impact resistance as in the conventional case.

(7) Since the fluororesin has a small friction coefficient, the crushed cellulosic material and the thermoplastic resin molding material flow in a good kneading state, so that the surface of the wooden synthetic board which is a molding board as a product. It was possible to mold a wood-based synthetic board having a smooth surface without causing rough skin.

(8) On the molding plate extruded from the molding die,
Since the density of the extruded material in the forming part of the forming die was increased by applying the suppressing force against the extruding force of the forming plate, it was possible to extrude the wood synthetic plate having a more uniform density and a high density.

(9) Since the extruded dough is heated at the introduction part of the forming die and extruded into the forming part of the forming die, the extruded dough is maintained in fluidity, that is, the extruded dough is formed while maintaining a good kneading state. It was possible to smoothly extrude into the molding part.

(10) A crushed cellulose material is mixed in a thermoplastic resin molding material in an amount of 20 to 75 wt% and heated and kneaded.
A molding die having an introduction part for heating the extruded dough discharged from the extruding port and a molding part for extruding the extruded dough extruded from the introducing part into a predetermined thickness at the discharge port of the extruder for extruding with a screw. In addition to connecting the above, a sheet of fluororesin is attached to the inner wall surface of the molding part or a cooling means for coating the fluororesin and cooling the molding part is provided in the molding die, so that it is extruded from the molding die in a good kneading state. Thus, it was possible to provide an extrusion molding device for a wood synthetic board which directly and directly forms a wide, uniform, high density, and good quality wood synthetic board.

(11) The introduction portion of the molding die for heating the extruded dough discharged from the extrusion die of the extruder has a total length of 70 to 95% of the total length in the width direction of the introduction portion, and the introduction Since the guide plate having a height of 70% or less of the height of the section is provided, the extruded dough is evenly diffused by the guide plate into the forming chamber of the forming section in the introducing section, and the extruded dough 79 is extruded depending on the raw material. Direction, it is possible to prevent different linear expansions at the central part and the end parts to make the molecular orientation different, to homogenize the linear expansion, control the molecular orientation, and form the molding chamber 2 of the molding part 21.
2 is evenly dispersed in 2 and extruded at a uniform density, and since a sheet of fluororesin is attached or coated with fluororesin on the surface of the guide plate, cellulose in the extruded cloth that passes through the surface of the guide plate. The crushed material flowed smoothly without great resistance, and a uniform and high-density synthetic wood board could be formed.

(12) Further, since the braking means for applying the suppressing force against the extruding force of the forming plate extruded from the forming die in the above item (10), is provided, the suppressing force causes the inside of the forming portion of the forming die to move. In order to increase the density of the extruded dough, it has been possible to provide an extrusion molding device for a wood-based synthetic board, which extrudes a wood-based synthetic board with a more uniform density.

(13) The braking means is provided with a pair of pinch rollers that sandwich and press-contact the front and back surfaces of the molding plate, and a brake drum is provided at the shaft end of the pinch rollers to provide friction that suppresses rotation of the brake drum. Since the body was constantly pressed against the brake drum, a uniform restraining force against the pushing force of the molding plate could be applied to the entire width direction of the molding plate.

(14) The braking means is provided with a plurality of pairs of upper and lower pinch rollers that sandwich and press-contact the front and back surfaces of the molding plate, and the pinch rollers are rotatably air-supported at both shaft ends of the upper pinch roller. Since the tip of the rod of the cylinder is connected and the pressing force is freely adjustable with respect to the lower pinch roller via the forming plate, the pressing force on the forming plate can be easily adjusted according to the plate thickness of the forming plate.

(15) The braking means is provided with a plurality of pairs of upper and lower pinch rollers that sandwich and press-contact the front and back surfaces of the molded plate, and connect the shaft end of one pinch roller to the input shaft of the powder brake. Since the gears provided on the shaft ends of the pinch rollers are meshed with each other, the same rotation suppressing force can be applied to a plurality of pairs of pinch rollers, and pressing force is not applied to a part of the pinch roller forming plate. It is possible to apply a pressing force to a large surface of the forming plate without applying a uniform pressing force against the pushing force of the extruded material in the forming die, and the extruded material can be made uniform and have a high density. Moreover, the suppressing force could be easily fine-tuned to the suppressing force with good production efficiency according to the plate thickness of the forming plate.

(16) By the extrusion molding method of the present invention for wood-based synthetic boards, various building materials such as concrete panels, flooring (flooring blocks) for houses, decorative walls for indoor wall surfaces, furniture materials, and electrical equipment We were able to provide materials for a wide range of purposes, such as various equipment parts such as box panels and interior materials for various interiors such as decorative boards in automobiles.

(17) Since a high-density wood synthetic board can be formed by the extrusion molding method of the present invention, a large amount of wood powder per unit weight can be mixed in, so that the wood synthetic board is inexpensive and of high quality. Could be molded.

(18) The extrusion die of the extruder forms a rectangular injection port having a height equal to or less than the height of the molding chamber of the molding section of the molding die, and gradually narrows its cross section toward this injection port. Since it was formed so as to change, it was possible to discharge a large amount of molten wood-based synthetic powder, promote consolidation, and prevent clogging of the die.

[Brief description of drawings]

FIG. 1 is an overall front view showing a cross section of a main part of a mixer (fluid mixing and kneading means) used in an example of the present invention.

FIG. 2 is an overall front view showing a cross section of a main part of a cooling mixer (cooling granulation means) used in an example of the present invention.

FIG. 3 is an overall front view showing a cross section of a main part of a cutter mill (size regulating means) used in an example of the present invention.

FIG. 4 is an overall front view showing a cross section of a main part of an extruder used in an example of the present invention.

FIG. 5 is a front view showing a vertical cross section of a molding die and a brake means according to an embodiment of the present invention.

FIG. 6 is a plan view showing a cross section of a main part of a molding die and a brake means according to an embodiment of the present invention.

FIG. 7 is a front view showing details of the braking means of the embodiment of the present invention.

FIG. 8A is a diagram showing a cross-section of a main part of another embodiment of the present invention. (B) It is a figure which shows the principal part cross section of the other Example of this invention.

FIG. 9 is a front view showing a vertical cross section of a molding die according to another embodiment of the present invention.

10 is a vertical cross-sectional view taken along the line JJ of FIG.

11 is a vertical sectional view taken along the line KK of FIG.

FIG. 12 is a plan view showing a cross section of a main part of a molding die according to another embodiment of the present invention.

FIG. 13 is a plan view showing a cross section of a main part of a braking means of another embodiment of the present invention.

14 is a vertical cross-sectional view taken along the line NN of FIG.

FIG. 15 is a front view of an apparatus showing a conventional calender molding method.

FIG. 16 (A) is a front view of an apparatus showing a conventional extrusion molding method. (B) is a state diagram of a tubular extruded cloth and an expanded cloth by a conventional extrusion molding method.

[Explanation of symbols]

 10 Molding Die 11 Introductory Part 12 Introducing Hole 13 Introducing Chamber 14, 14a Heater 15 Guide Plate 16 Screen Part 17 Adapter 18 Inlet 19 Extrusion Die 21 Forming Part 22 Forming Chamber 23 Die Outlet 24 Sheet (of Fluorine Resin) 25 Cooling Pipe 27 Pin 28 Mounting tool 29 Forming plate 30, 30a Braking means 31 Pinch roller 31a Fixed pinch roller 31b Flexible pinch roller 32 Shaft 33 Brake drum 34, 34a, 34b Bearing 35 Brake belt 36 Bearing fixed frame 37 Bearing free frame 38 Guide shaft 39 Brake Belt holder 40 Brake tensioner 41 Shaft 42 Fixed plate 43 Spring 44 Spring 45 Spring 46 Tension bracket 47 Tensioner 48 Lever 49 Nut 51 Screw 52 Heat roll 53 Complement Regular roll 54 Opening 55 Guide 56 Electric heater 57 Infrared heater 61 Molding die 62 Cutting tool 63 Expanding fabric 64 Heat roll 65 Compensating roll 66 Roll 70 Extruder 71 Screw 72 Gear reducer 73 Hopper 74 Barrel 75 Band heater 76 Screen 77 Adapter 78 Extrusion die 79 Extrusion dough 80 Mixer (fluid mixing and kneading means) 81 Mixer body 82 Upper lid 83 Shaft 84 Scraper 85,86,87 Stirring impact blade 88 Ejection port 89 Lid 91 Cylinder 92 Tightening nut 93 Exhaust duct 94 Input port 95 Gas discharge pipe 100 Cooling mixer (cooling granulation means) 101 Mixer main body 102 Jacket 103 Arm 104 Stirring and crushing blade 105 Motor 106 Valve 107 Discharge port 108 Water supply pipe 109 Drain pipe 111 Data 112 Speed reducer 113 Input port 114 Frame 115 Powder brake 116 Gear 117 Gear 118 Cylinder 119 Guide body 120 Cutter mill (granulating means) 121 Cutter mill body 122 Lid 123 Input port 124 Cutter support 125 Rotating blade 126 Fixed blade 127 Input chamber 128 sizing chamber 129 screen 131 outlet

Claims (28)

[Claims] 1. A cellulosic crushed product having an average particle size of 20 mesh or less and having a water content of 15 wt% or less 20 to 75 wt%
On the other hand, 25-80 wt% of a thermoplastic resin molding material is mixed, gelled and kneaded, cooled and pulverized, and sized to a particle size of 10 mm or less. 2. A crushed cellulosic material having an average particle size of 20 mesh or less and 20 to 75 wt% with a water content of 15 wt% or less.
On the other hand, 25 to 80 wt% of the thermoplastic resin molding material is mixed together by a stirring impact blade and gelled and kneaded by friction heat,
Next, a method for producing a synthetic wood powder comprising at least a step of cooling, pulverizing and sizing to a particle size of 10 mm or less. 3. A cellulosic crushed product having an average particle size of 20 mesh or less and having a water content of 15 wt% or less 20 to 75 wt%
In the meanwhile, 25-80 wt% of the thermoplastic resin molding material is mixed together, and the fluidized mixing and kneading means is provided with a stirring impact blade for gelling and kneading by frictional heat, and the above gelled kneading material is cooled and granulated inside. A wood-based synthetic powder comprising a cooling granulating means having a crushing blade and having a jacket provided with an inlet and an outlet of cooling water, and a sizing means for sizing the cooled and granulated granulated wood powder to a particle size of 10 mm or less. Manufacturing equipment. 4. An average particle size of 20 with a water content of 15 wt% or less.
Thermoplastic resin molding material 25 to 80 wt% is mixed with cellulosic crushed material 20 to 75 wt% of mesh or less, gelled and kneaded, and cooled to heat and knead the synthetic wood powder which has been sized to a particle size of 10 mm or less. A synthetic wood board characterized in that the extruded dough that is formed and extruded into a forming die with a screw is gradually cooled, and that the extruded dough has a high density by applying a restraining force against the extruding force. . 5. A crushed cellulosic material having an average particle size of 20 mesh or less and 20 to 75 wt% with a water content of 15 wt% or less.
On the other hand, 25 to 80 wt% of the thermoplastic resin molding material is mixed together by a stirring impact blade and gelled and kneaded by friction heat,
Then, the synthetic wood powder that has been cooled and crushed to form particles having a particle size of 10 mm or less is heated and kneaded, and the extruded dough extruded into a forming die with a screw is gradually cooled, and the extruded dough is resistant to the extruding force. A method for extrusion-molding a wood-based synthetic board, which comprises at least a step of increasing the density of the extruded dough by applying a restraining force of 6. A crushed product of a cellulosic material is mixed in a thermoplastic resin molding material in an amount of 20 to 75 wt%, heated and kneaded, and extruded into a molding die with a screw.
A wood-synthesizing method characterized in that a fluororesin sheet is adhered to the inner wall surface or extruded into a molding portion of a molding die coated with fluororesin to form a predetermined thickness and then gradually cooled in the molding portion and extruded. Extrusion molding method for plates. 7. A crushed cellulosic material is mixed in a thermoplastic resin molding material in an amount of 20 to 75 wt%, heated and kneaded, and extruded into a molding die with a screw.
A sheet of fluororesin is attached to the inner wall surface or extruded into a molding portion of a molding die coated with fluororesin to form a predetermined wall thickness and slowly cooled in the molding portion to extrude, and extruding this formed plate. A method for extrusion-molding a wooden synthetic board, characterized by increasing the density of the extruded dough in the forming part by applying a suppressing force against the force. 8. The extrusion molding method for a wood-synthesized board according to any one of claims 5 to 7, wherein the extruded dough is heated at an introduction portion of a molding die and extruded into the molding portion of the molding die. 9. An extrusion die discharged from the extrusion die of an extruder in which a crushed material of a cellulosic material is mixed in a thermoplastic resin molding material in an amount of 20 to 75 wt%, heated, kneaded, and extruded with a screw. A molding die including a molding unit having a molding chamber for molding the extruded dough extruded from the introduction unit into a predetermined wall thickness is connected to the introduction unit for heating the dough, and a fluororesin is formed on the inner wall surface of the molding unit. An apparatus for extruding a wood-based synthetic board, characterized in that the molding die is provided with a cooling means for pasting the sheet or coating the fluororesin and cooling the molding chamber. 10. A crushed cellulosic material having an average particle size of 20 mesh or less and having a water content of 15 wt% or less, 20 to 75 wt.
% Of the thermoplastic resin molding material to 100% by weight, and a fluidized mixing and kneading means provided with a stirring impact blade for gelling and kneading by frictional heat, and an inside for cooling and granulating the gelled kneading material. Cooling granulating means having a stirring and crushing blade and having a jacket with an inlet and an outlet of cooling water; and the granulated wood powder obtained by the cooling granulation was sized to a particle size of 10 mm or less,
A sizing means for obtaining a synthetic wood powder, heating, kneading the synthetic wood powder, to an extrusion die of an extruder for extruding with a screw, an introduction section for heating the extruded dough discharged from the extrusion die, and this introduction. The molding die having a molding chamber for molding the extruded material extruded from the molding section to a predetermined thickness is connected, and a fluororesin sheet is attached or coated on the inner wall surface of the molding section. And a molding device for cooling the molding chamber, wherein the molding die is provided with a cooling means. 11. The crushed cellulosic material is stirred and mixed by a stirring impact blade, dried by friction heat, and then,
The method includes the step of mixing the crushed cellulose material with a thermoplastic resin molding material by a stirring impact blade, kneading by gelation by frictional heat, cooling, crushing and sizing to a particle size of 10 mm or less. Item 2. A method for producing a woody synthetic powder or a method for producing a woody synthetic board. 12. The fluid mixing and kneading means includes means for drying the cellulosic crushed material to a water content of 0.1 to 0.3 wt% by frictional heat generated by rotation of a stirring impact blade. Manufacturing equipment for wood synthetic powder or wood synthetic board. 13. The introduction part of the molding die for heating the extruded dough discharged from the extrusion die of the extruder has a total length of 70 to 95% of the total length in the width direction of the introduction part, and the introduction part. An extrusion molding device for a wood-based synthetic board, characterized in that a guide plate having a height of 70% or less of the height is provided. 14. A fluororesin sheet is attached or coated with a fluororesin on the surface of the guide plate.
An extrusion molding device for a wood-based synthetic board according to item 1. 15. The extrusion molding apparatus for a wood-synthesized board according to claim 9, further comprising a brake means for applying a restraining force against the extrusion force of the molding plate extruded from the molding die. 16. The braking means is provided with a pair of pinch rollers that sandwich and press-contact the front and back surfaces of a molded plate, and a brake drum is provided at an axial end of the pinch roller, and friction that suppresses rotation of the brake drum is provided. The extrusion molding device for a wood-based synthetic board according to claim 15, wherein a body is pressed against the brake drum. 17. The brake means is provided with a plurality of pairs of upper and lower pinch rollers that sandwich and press-contact the front and back surfaces of a molding plate, and the pinch rollers are rotatably provided at both shaft ends of the upper pinch roller. 16. The extrusion molding apparatus for a wood-synthesized board according to claim 15, wherein the rod tips of the above are connected to each other, and the pressing force is adjustable with respect to the lower pinch roller via the molding board. 18. The braking means is provided with a plurality of pairs of upper and lower pinch rollers that sandwich and press-contact the front and back surfaces of a molded plate, and connect a shaft end of one pinch roller to an input shaft of a powder brake. The extrusion molding device for a wood-synthesized board according to claim 15, wherein gears provided at the shaft ends of the pinch rollers are meshed with each other. 19. The cellulosic crushed material has a particle size of 5
0 to 300 mesh, preferably 60 to 150 mesh, water content within 15 wt%, preferably 3 to 5 wt%
The method for extruding a wood-based synthetic board or the apparatus for extrusion-molding a wood-based synthetic board according to claim 6, 7 or 9. 20. Wood flour 60 as a cellulosic crushed material
% To 75 wt% and 25 to 40 wt% of one or several kinds of polypropylene or polyethylene as a thermoplastic resin molding material are mixed, the synthetic wood powder, the method for producing a synthetic wood powder, and the wood An apparatus for producing synthetic powder, a wooden synthetic board, an extrusion molding method for a wooden synthetic board, or an extrusion molding apparatus for a wooden synthetic board. 21. Wood flour 60 as a cellulosic crushed material
〜65wt% mixed with polycarbonate, nylon, or PVC35-40wt% as thermoplastic resin molding material 1
To 5 or 10, a method for producing a synthetic wood powder,
An apparatus for producing a synthetic wood powder, a synthetic wood board, an extrusion molding method for a synthetic wood board, or an extrusion molding machine for a synthetic wood board. 22. The method for producing a synthetic wood powder and the apparatus for producing a synthetic wood powder according to claim 2, wherein 1 wt% of a 40% concentration aqueous urea solution is mixed with the crushed cellulosic material. A method for extruding a wooden synthetic board or an apparatus for extruding a wooden synthetic board. 23. Calcium carbonate or titanium oxide is used in an amount of 5 to 2 with respect to the cellulosic crushed material and the thermoplastic resin molding material.
The method for producing a woody synthetic powder, the apparatus for producing a woody synthetic powder, the method for extruding a woody synthetic board or the apparatus for extruding a woody synthetic board according to any one of claims 2, 3, 5 and 10, wherein 0 wt% is mixed. 24. The method for extrusion-molding a wood-synthesized board or the extrusion-molding apparatus for a wood-synthesized board according to claim 6, 7 or 9, wherein a crushed material of a cellulosic material is mixed in a thermoplastic resin molding material in an amount of 30 to 70 wt%. 25. The extrusion molding device for a wood-synthesized board according to claim 9 or 10, wherein the introduction portion is formed in the molding die in the width direction of the molding die, has a vertical cross-section swelled to have an elliptical shape, and has an introduction hole. . 26. The introduction portion is formed in a coat-hanger type which is curved in the width direction of the molding die and has both ends extending to both ends in the longitudinal direction of the molding chamber inlet, and a portion between the introduction hole and the molding chamber inlet is the molding chamber. The extrusion molding device for a wood-synthesized board according to claim 9 or 10, further comprising: an introduction chamber having a triangular cross-section in a direction in which a vertical cross section gradually narrows toward the front. 27. The extrusion molding apparatus for a wood-based synthetic board according to claim 9, wherein the extrusion die of the one extruder is provided so as to communicate with the second molding die. 28. The extrusion die of the extruder forms a rectangular injection port having a height equal to or less than the height of the molding chamber of the molding portion of the molding die, and the cross-section changes gradually toward the injection port. An extrusion molding apparatus for a wood-based synthetic board according to claim 9 or 10, which is formed to