JPH08216122A - Method and apparatus for extrusion molding reinforced woody synthetic plate - Google Patents

Abstract

PURPOSE: To obtain a woody synthetic plate in which a reinforcing material is dispersed in woody synthetic plate and the strength is improved. CONSTITUTION: The method for extrusion molding reinforced woody synthetic plate comprises the steps of setting containing water content to 15wt.% or less, mixing 25 to 80wt.% of thermoplastic resin molding material with 20 to 75wt.% of wood chip of cellulose comminuted powder having mean particle size of 20 mesh or less, gelatinizing, kneading, cooling, comminuting and granulating it to woody synthetic powder, mixing the powder with reinforcing material 45 such as glass fiber, filling the mixed material in an extruder, and extruding raw material 79 in an extruding die 10 via an extrusion die 19 having a rectangular injection port capable of discharging a large quantity of raw material 79 by the extruder. The material 79 extruded to the die 10 is gradually cooled in the die 10 to be cured. A suppressing force against the extrusion force is applied to the material 79 extruded into the die 10 to enhance the close contact properties of the reinforcing material to the resin, thereby preventing the cavity of the plate to mold reinforced woody synthetic plate in which the reinforcing material is dispersed in the plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for extrusion-molding a reinforced synthetic wood board using synthetic wood powder composed of a thermoplastic resin molding material and cellulose-based crushed material such as wood powder as a molding material. Is a mixed raw material of a thermoplastic resin molding material and a cellulosic crushed material applied to various applications such as building materials, automobiles, interior and exterior parts of vehicles, or a synthetic wood powder made of these mixed raw materials as a molding material. TECHNICAL FIELD The present invention relates to an extrusion molding method and apparatus for a reinforced wooden synthetic board, which is obtained by stirring and mixing a molding material with a reinforcing material and extruding the mixture with an extruder to form a synthetic board having a predetermined wall thickness.

In particular, one or both of the cellulosic crushed material and the thermoplastic resin molding material are used for a wide range of applications such as construction waste materials, automobiles, household electric appliances, and daily necessities with the diversification of life. Used in a large amount and in large quantities, and reused cellulose-based crushed materials such as wood, newspapers, magazines, etc. and waste materials of various thermoplastic synthetic resin products that have been discarded in large quantities, and reused these cellulose-based crushed materials and thermoplastic The present invention relates to a method and an apparatus for dispersing a reinforcing material in a resin synthetic plate for the purpose of reinforcing the wooden synthetic plate when recycling the resin molding material as the wooden synthetic plate.

[0003]

BACKGROUND OF THE INVENTION Cellulose crushed materials and thermoplastic resin molding materials are used in various daily necessities such as building materials, paper products, automobiles, household electric appliances, etc. with the diversification of life in recent years, and are discarded in large quantities. Therefore, it is socially required to reuse the waste materials of these various thermoplastic resin products.

Conventionally, the development of a molding resin product based on this type of crushed cellulosic material such as wood powder and a thermoplastic resin molding material has been aimed at improving the water resistance and heat insulating property of the molding resin product. Various aspects, especially from the viewpoint of securing forest resources in response to the demand for global environment conservation in recent years,
Further, due to the soaring cost of wood and the perceptually strong latent demand for wood products, there is a demand for the development of molded resin products using the aforementioned waste materials.

In order to satisfy such a demand, there is provided a method of reusing the waste material of the thermoplastic resin product to form a synthetic board, and a cellulosic crushed waste material such as a building material and a paper product which is also used as the synthetic board. There is a method of dispersing objects to form a synthetic board having a texture of wood.

However, in the case of a synthetic plate molded using such a thermoplastic resin molding material, particularly a synthetic board in which a crushed material of cellulose such as wood powder is dispersed in the thermoplastic resin molding material,
Its strength is lower than that of natural wood or plywood made by laminating wood.Therefore, in order to compensate for this strength, if the thickness of this wood synthetic board is made thick, the weight of the wood synthetic board is The increased size makes the application of such wood composite boards very limited.

It should be noted that a method of burying a reinforcing material such as glass fiber in a synthetic plate for the purpose of improving the strength of a thermoplastic resin molded plate is known, though it is not a product in which crushed cellulosic material such as wood powder is dispersed. Has been.

As a method for this reinforcement, concretely, short fibers commonly called glass wool, glass wool, etc. are stacked in a thin mat shape, and the core is coated with a polyester resin or the like to be solidified, and then a roof plate or a sheet glass. A method for producing fiber reinforced plastic (FRP) used as a substitute wall material,
A reinforcing material made of polyester fiber is dispersed in polypropylene, the polypropylene (PP) and the polyester fiber are molded into pellets by an extruder, and the pellets containing the reinforcing material are molded by a calender molding method to mold a synthetic plate. It is known how to do it.

[0009]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention Like the fiber reinforced plastic (FRP) described in the prior art, short glass fibers are stacked in a thin mat shape, and this is used as a core, and the core is impregnated with a polyester resin or the like for coating. In the case of the method of hardening, such a synthetic plate cannot be manufactured by extrusion molding, and the step of impregnating the reinforcing material layer with a resin and the synthetic plate manufactured by impregnating the resin with a predetermined thickness are formed. In addition, the molding process to remove the distortion of the synthetic plate surface,
Since a plurality of steps are required, it is not possible to simultaneously form the synthetic plate and embed the reinforcing material in one step.

In addition, conventional reinforced fiber plastic (FR
If it is attempted to impregnate the reinforcing material layer with a thermoplastic resin molding material obtained by mixing and melting a cellulosic crushed material such as wood powder by using a glass fiber mat or the like as a reinforcing material layer in the same manner as in P), The cellulosic crushed material mixed in the thermoplastic resin molding material is caught on the surface of the reinforcing material layer and hardly penetrates into the reinforcing material layer, and the cellulosic crushed material is concentrated near the surface of the reinforcing material layer, The dispersed state will not be uniform, and will not have the function and properties of a wood synthesis board.

On the other hand, when the crushed cellulosic material such as wood powder and the reinforcing material are dispersed in the thermoplastic resin molding material, the reinforcing material is heated when pellets of the thermoplastic resin molding material are produced by the same method as in the conventional method. When melted and dispersed in a plastic resin,
When the reinforcing material is dispersed, the thermoplastic resin is heated to its melting temperature. Therefore, when a reinforcing material made of the same material as the thermoplastic resin molding material is mixed in the thermoplastic resin molding material, Completely dissolves in the thermoplastic resin molding material, and cannot be used as a reinforcing material.

When a crushed product of cellulose such as wood powder is dispersed in the synthetic plate, when the crushed product of cellulose is dispersed in the molded product of thermoplastic resin, the molded product of thermoplastic resin and the cellulose compound are used. The crushed material is stirred at high temperature and high rotation, and the short fibers such as glass fibers that are put into the thermoplastic resin during the stirring are condensed in the thermoplastic resin, or are entangled with each other, or partly. It concentrates and is no longer used as a reinforcing material.

In addition, the extruded dough obtained by mixing a crushed cellulose material such as wood powder or a reinforcing material such as glass fiber into a thermoplastic resin molding material has poor fluidity and is extruded into a usual extrusion die or molding die. In this case, the extrusion die is frequently clogged, making actual mass production impossible.

In addition, as a result of experiments conducted by the inventors of the present invention, when such a dough having poor fluidity is extrusion-molded, the discharge height of the extrusion die and the entrance height of the molding die are set to be the same. Although it was clarified that clogging can be minimized, in the conventional extruder, the height of the molding chamber of the molding die was changed when changing the thickness of the synthetic plate to be molded. In that case, since the height of the inlet of the molding die also changes at the same time, in order to always make the height of the discharge outlet of the extrusion die and the height of the inlet of the molding die the Both the molding die and the extrusion die must be replaced, which is complicated.

The object of the present invention is to stir and mix a thermoplastic resin molding material and a cellulosic crushed material to form pellets, and mix a reinforcing material into the raw material (woody synthetic powder) and stir it.
After that, the reinforcing material is dispersed in the thermoplastic resin molding material by a method in which the mixture of the synthetic wood powder and the reinforcing material is put into an extruder and extrusion molding is performed, whereby the strength of the wooden synthetic board in which the cellulosic crushed material is dispersed is dispersed. In addition to improving the performance, it is possible to mold a wooden synthetic board with a reinforcing material embedded in it in a single step by extrusion molding, and the familiarity between the reinforcing material and the resin is better, and the same material as the thermoplastic resin molding material is used. Another object of the present invention is to provide a method of manufacturing a reinforced wood-based synthetic board that can use the reinforcing material.

Another object of the present invention is extrusion molding of a reinforced resin synthetic plate which has no clogging and does not require replacement of the extrusion die even when the thickness of the synthetic plate produced is changed. To provide a device.

[0017]

In order to achieve the above object, an extrusion molding method for a reinforced wood composite board according to the present invention comprises:
25-80 wt% of a thermoplastic resin molding material is mixed with 20-75 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, gelled and kneaded, cooled and sized to obtain wood. Synthetic powder, the wood synthetic powder and the reinforcing material 45 are agitated and mixed, and the wood synthetic powder stirred and mixed with the reinforcing material 45 is heated and kneaded to form a dough. It is extruded from the extrusion die 19 into the forming chamber 22 of the forming die 10, and in the forming chamber 22, the extruded material 79 is heated and then gradually cooled.
It is characterized in that the extruded dough 79 in 2 is applied with a restraining force against the extruding force of the extruder 70 to increase the density of the extruded dough and cure the extruded dough.

The screw 71 reduces the change in the depth of the groove from the base to the tip, and the extrusion material 7
It is preferable to improve the fluidity of No. 9 and, more preferably, separately from or together with the above configuration, the injection port of the extrusion die 19 is the same as or substantially the same as the height of the inlet 11 of the molding die 10. Formed in a square with the same height,
In addition, the extrusion material 79 formed in the extrusion die 19
Via the extrusion die 19 formed so that the flow path of the extrusion die 19 gradually narrows toward the injection port of the extrusion die 19.
It is preferable to extrude the extruded material 79.

On the inner wall surface of the molding chamber 22, a fluororesin sheet may be attached or coated with the fluororesin.

Furthermore, the mixing ratio of the synthetic wood powder and the reinforcing material 45 is 70 to 97 wt% of the synthetic wood material and 3 parts of the reinforcing material.
It is preferable to set it to ˜30 wt%.

As the reinforcing material 45, any one or more kinds of single fibers selected from glass fiber, plastic fiber, carbon fiber, metal fiber, pulp fiber and cotton fiber can be mixed and used. Alternatively, it is also possible to use a plurality of single fibers converged or a filament formed by twisting these fibers together.

Further, in most cases, the extrusion temperature of the wood-synthesized board can be set to a temperature not higher than the melting temperature when the thermoplastic resin molding material which is gelled and kneaded in the wood-synthesized powder is extruded alone. Therefore, the same material as the thermoplastic resin molding material forming the synthetic wood powder can be used as the reinforcing material.

In addition, the reinforcing member 45 has a length of 10 to 3
A diameter of 0 mm and a single fiber diameter of 6 to 24 μ are suitable.

The reinforced wood synthetic board extrusion molding apparatus according to the present invention has a water content of 15 wt% or less and an average particle size of 20 mesh or less 20 to 75 wt% of a cellulosic crushed material.
25-80 wt% of the thermoplastic resin molding material is mixed, gelled and kneaded, cooled and sized to form a synthetic wood powder. The synthetic wood powder and the reinforcing material 45 are stirred and mixed, and this mixture is obtained. The extruded dough 79 extruded from the extruding die 19 is fed to the extruding die 19 of the extruder 70, which heats and kneads the raw material and extrudes the extruding die 19 with the screw 71 in which the change in the depth of the groove is reduced from the base to the tip. A molding die 10 having a molding chamber 22 having a melting portion 22a to be heated and a gradual cooling portion 22b to be formed into a predetermined thickness and gradually cooled is connected to the molding chamber 2
A heater 14 for attaching a fluororesin sheet to or coating the fluororesin on the inner wall surface of 2 and heating the molding chamber 22.
And a cooling means 25 for cooling the molding chamber 22 and the molding die 10
And a brake means 30 for applying a restraining force against the extruding force of the extruded material 79 extruded from the molding die 10.

Further, the injection port of the extrusion die 19 is formed in a rectangular shape having the same or substantially the same height as the height of the inlet 11 of the molding die 10, and the extrusion dough 79 formed in the extrusion die 19 is formed. It is preferable to form the flow path so as to gradually change its cross section toward this injection port,
Further, the molding die 10 includes two metal plates 26,
27, which is the inner wall surface of one or both of the upper and lower two metal plates 26, 27 forming the molding die 10, and which is the inner wall surface of the molding chamber 22 forming the melting portion 21 a. The cross-section is gradually changed toward the slow cooling part 21b so that either one or both of the upper and lower two metal plates 26 and 27 can be exchanged, and either one of the upper and lower two metal plates 26 and 27 or Forming the forming die 10 without changing the height of the inlet 11 of the forming die 20 by exchanging both of the upper and lower metal plates 26, 27 with metal plates having different inner wall heights. It is characterized in that the height of the chamber 22 can be changed.

[0026]

The wood synthetic powder made of a mixture of a thermoplastic resin molding material and a cellulosic crushed product, which is molded into pellets, and a reinforcing material 45 such as glass fiber, plastic fiber, carbon fiber, wood fiber, steel fiber, etc. are known. After stirring with a stirrer, this is put into the extruder 70. Since a low-speed rotating type is used as the stirrer, the reinforcing material 45 is not entangled with each other when the pellets and the reinforcing material 45 are stirred, and is not curled in a good state. Stir with pellets.

The raw material charged in the extruder 70 is heated and kneaded in the extruder 70, and the screw 71 pushes the raw material into the extrusion die 19.
Is extruded as the extrusion material 79 into the inlet 11 of the forming die 10. Extrusion of dough with dispersed synthetic wood powder,
Because it can be extruded at a temperature lower than the temperature when melting the thermoplastic resin molding material that is the main raw material of the dough,
Even when the reinforcing material 45 dispersed in the extruded dough 79 is made of the same material as the thermoplastic resin molding material that is the main raw material of the dough, the reinforcing material dispersed in this dough is completely melted and Instead of blending in, it remains in the fabric with its original shape retained and acts as a reinforcing material for the wooden synthetic board. The screw 71 has a reduced groove depth from the base to the tip, and the extruded dough 79 with reduced fluidity as a result of the mixture of cellulosic crushed materials such as wood powder and the reinforcing material 45. It can be satisfactorily fluidized, and the molding die 1
The extrusion to 0 is performed by the extrusion die 19 having a rectangular injection port having a height substantially equal to the height of the molding chamber 22 of the molding die 10 and gradually changing its cross section toward this injection port. The extruded material 79 having a reduced fluidity due to the mixture of the crushed material and the reinforcing material 45 is provided with good fluidity, and the reinforcing material 45 and the crushed cellulose material are uniformly dispersed in the thermoplastic resin. Extruded to 10.

The extruded dough 79 extruded from the extruder 70 into the forming die 10 is extruded into the melting portion 21a of the forming chamber 22 heated by the heater 14 and heated to be formed into a predetermined thickness while melting. After passing through 21a, it is extruded into the slow cooling section 21b of the molding chamber 22 and introduced into the slow cooling section 21b. If a sheet 24 of fluororesin having a small friction coefficient is attached to the inner wall surface of the molding chamber 22 or coated with the fluororesin, the extruded material 7 passing through the inner wall surface 7
Even when the cellulosic crushed material, the reinforcing material 45 and the like are contained in the material 9, the material 9 smoothly flows without receiving a large resistance and is extruded while maintaining a uniform and high density kneading state.

The slow cooling part 21b in the molding chamber 22 is cooled by, for example, a cooling pipe 25.
The extruded dough 79 is slowly cooled by the cooling medium such as water or oil at room temperature to 60 ° C. to 90 ° C.
In the process of passing 1b, it is gradually cooled and hardened.

Since the reinforcing material 45 flows together with the thermoplastic resin molding material and the cellulosic crushed material from the melting portion 21a to the slow cooling portion 21b, the reinforcing material 45, the thermoplastic resin molding material and the wood powder are The temperature is changed in substantially the same manner and the slow cooling unit 2
After being hardened in 1b, the reinforcing material 45 and the wood powder have a good compatibility with the thermoplastic resin molding material, and are strongly fixed in the thermoplastic resin molding material.

The fluororesin sheet 2 is formed on the inner wall surface of the molding chamber 22.
When 4 is attached or coated with a fluororesin, since the fluororesin has a lower thermal conductivity coefficient than metal, the extruded dough 79 is gradually cooled in the slow cooling part 21b without being rapidly cooled, Distortion due to cooling is reduced, and a reinforced wooden synthetic board which is a synthetic board 29 as a uniform and high-density product is formed.

Further, a braking force is applied to the extruding force applied to the synthetic plate 29 by the extruder 70 by the brake means 30, and the extruding force is applied to the extruded material 79 in the molding chamber 22 via the synthetic plate 29. When the reaction force is applied to the extruded material 79, the density of the extruded material 79 in the molding chamber 22 becomes more uniform and higher than that in the case where this suppressing force is not applied to the extruded material 79. Therefore, a uniform and high density wooden synthetic board can be obtained, and the consolidation and adhesion between the reinforcing material 45 and the thermoplastic resin molding material are improved, so that the reinforcing wooden synthetic board having high strength is formed.

[0033]

Next, an embodiment of the present invention will be described with reference to the drawings.

1. Manufacturing method and device for reinforced resin composite plate 1-1. [Extrusion Step] [Extruder 70] In FIG. 1, 70 is a single-screw extruder. Generally, the extruder is a screw type as shown in the figure,
There are single-screw extruders and multi-screw extruders, or variants thereof and structures having a combination thereof. As the extruder of the present invention, one having any of the above structures can be used.

Reference numeral 71 denotes a screw, which is a single-screw type in this embodiment. Generally, a screw used for extrusion molding has a large change in the drawing of the screw groove from the base toward the tip, but the screw of the present invention reduces the drawing change of the screw groove to reduce the change in the drawing of the cellulose groove such as wood powder. It improves the fluidity of extruded dough whose fluidity has decreased due to the inclusion of crushed materials and reinforcing materials. Incidentally, the depth of the general screw groove is 10 mm at the base and 1-2 mm at the tip, but the screw 71 of the present invention has the depth of the screw groove at 10 mm at the base and 7-8 mm at the tip. ing.

The screw 71 is driven by a motor (not shown) and rotates in the barrel 74. By the rotating screw 71, the synthetic wood powder fed from the hopper 73 and the reinforcing material mixed with the synthetic wood powder are kneaded and pushed out 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 thermoplastic resin molding material and the cellulosic crushed material in the barrel 74, and these and the reinforcing material, and along the groove of the screw 71. The thermoplastic resin molding material is transported to the front and gradually melted, and the crushed cellulosic material and the reinforcing material 45 are kneaded in a uniformly dispersed state. Then, through the screen 76 and the adapter 17, the adapter 17
From the extrusion die 19 of FIG.

Since the synthetic wood powder obtained by gelling and kneading the thermoplastic resin molding material and the cellulosic crushed material such as wood powder exhibits thixotropy (staggering), a strong pushing force is applied in the extruder 70. Then, the viscosity is reduced and the fluidity is improved. Therefore, as in the present invention, when extruding the extruded dough 79 in which the reinforcing material is dispersed by the extrusion molding method, the extruded dough 79 can be extruded at a low temperature, and therefore, the thermoplastic resin forming the synthetic wood powder is produced. Even when plastic fibers made of the same material as the molding material are dispersed, the plastic fibers remain in their original shape without being completely melted in the thermoplastic resin molding material during extrusion molding. Can be used as a reinforcing material.

As described above, the crushed material of cellulose such as wood powder and the thermoplastic resin molding material in which the crushed material of cellulose is dispersed, that is, the synthetic wood powder is extruded from the thermoplastic resin molding alone as described above. Since extrusion molding can be performed at a low temperature as compared with the case of molding, the reinforcing material 45 and the extruder 70 dispersed in the thermoplastic resin molding material are added to the thermoplastic resin molding material during extrusion molding. It can be prevented from being deteriorated by the applied heat, and the temperature of the formed wooden synthetic board itself becomes low, so that the wooden synthetic board can be easily cooled.

Regarding each thermoplastic resin molding material used in this example, A: Melting temperature when pellet molding was attempted with the thermoplastic resin molding material alone B: Wood powder was dispersed in the thermoplastic resin molding material Table 1 shows the results of measuring the gelation and kneading temperature of the two in the formation of pellets made of synthetic wood powder C: the resin temperature in the extruder during extrusion molding.

[0040]

[Table 1]

The raw material to be put into the barrel 74 is formed by pelletizing a mixture of a crushed cellulosic material such as wood powder, newspapers, magazines and the like, and a thermoplastic resin molding material, and pelletizing the mixture. This is a mixture of a powder and a reinforcing material, and this wood-based synthetic powder preferably makes the grain size of the wood powder good with the thermoplastic resin molding material, and reduces the friction resistance of the wood powder during extrusion molding to reduce the friction of the molding machine. In order to prevent wear and tear, 5
0 to 300 mesh, preferably 60 (under sieve) to 15
Made into a fine powder with 0 mesh (on the sieve), volatilize wood acid gas at the time of molding, eliminate the risk of generation of water vapor or bubbles, and have a water content of 8 wt% or less for the purpose of preventing surface roughening, It is preferably within 5 wt%, ideally within 0.3 wt%, mixed with thermoplastic resin molding material by stirring impact blades, gelled by friction heat, kneaded, cooled and crushed to form granules of 10 mm or less Use pellets that have been sized. And with this woody synthetic powder molded into pellets, glass fiber, plastic fiber, carbon fiber, steel fiber, wood fiber,
20 reinforcing materials 45 made of pulp fiber, cotton fiber, etc.
Stir for about 3 minutes with a stirrer rotating at low rpm,
The synthetic wood powder and the reinforcing material are mixed and put into the hopper 73 of the extruder 70. As described above, the fibers of the reinforcing material 45 to be stirred are entangled with each other by stirring the synthetic wood powder and the reinforcing material with a stirrer rotating at a low speed.
Or, since it is not twisted and curled up, the reinforcing material 4 is added to the thermoplastic resin molding material softened in the extruder 70.
No. 5 is dispersed in a good state together with a cellulosic crushed material such as wood powder. Depending on the purpose of use, the product can be colored by adding a pigment when molding the synthetic wood powder by gelling and kneading or by using colored wood powder as the raw wood powder.

1-2. [Extrusion Die] In FIG. 1, reference numeral 17 denotes an adapter, which is provided with an inlet 18 through which an extruded dough 79 kneaded by an extruder 70 flows and an extruding die 19 for discharging the extruded dough 79 to a forming die 10 described later. There is. Further, a protrusion having a rectangular cross section is provided at the tip of the adapter 17. The extrusion die 19 has an elongated rectangular shape with a width of 50 mm and a height of 12 mm so as to form a wall thickness of about 8 mm at the tip of the protrusion (FIGS. 7 and 8), and the inflow port 18 has an adapter 17 A circular shape having a diameter of 50 mm is formed on the rear end face thereof, and a flow path is formed from this inflow port 18 toward the extrusion die 19 where the cross-section is gradually deformed. The inlet 18 is formed to have the same size as the circular outlet of the extruder 70, while the rectangular width of the outlet of the extrusion die 19 is formed to be the same as the diameter of the inlet 18, and the height thereof is set to the same. Is preferably formed to have the same size as the height of the inlet 11 of the molding die 10 described later.

The rear end of the adapter 17 is the adapter 1
7 is connected to the distal end surface of the screen portion 16 provided with the screen 76 of the extruder 70 with a fixture such as a bolt through a fixture fitted to the outer periphery of the extruder 70, and the inlet port 18 of the adapter 17 and the screen portion of the extruder 70. 16 is communicated with the outlet of the molding die 10, and at the same time, a concave section having a rectangular cross section is formed at a substantially central position of the rear end surface of the molding die 10, and a protrusion having a rectangular cross section of the tip of the adapter 17 is attached to the concave section. 19 and inlet 11 of forming die 10
To communicate.

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

The extruded dough 79 extruded from the outlet of the screen portion 16 of the extruder 70 flows from the inflow port 18 of the adapter 17 and is molded from the extruding die 19 through the passage of the extruded dough 79 while being heated and kept warm by the heater. It flows from the inlet 11 of the die 10 into the forming die 10. The cross-sectional change of the communication hole from the inflow port 18 to the extrusion die 19 narrows relatively rapidly, but since this cross-sectional change is only the change in the height direction, the flow state of the extrusion material 79 is not complicated and is good. Is. Moreover, the extrusion die 19 has a large injection port, which is different from an ordinary general die.
9 is discharged, and since it is formed in a shape capable of promoting the density, the extruded dough 79 having reduced fluidity was discharged due to the mixture of the cellulosic crushed material such as wood powder and the reinforcing material 45 such as glass fiber. Even in some cases, the clogging that occurs in a normal die does not occur.

1-3. [Molding Die 10] In FIGS. 1 to 4, 10 is a molding die, which has a shape similar to that of a so-called T-die type molding die, and is connected to the extruder 70 via the adapter 17 and the extruder 70. It has an inlet 11 connected to the extrusion die 19 and a molding chamber 22 for molding the extruded dough 79 introduced from the inlet 11 into a wide plate having a predetermined wall thickness. The inside of the molding chamber 22 extends from the vicinity of the inlet of the molding chamber 22 toward the extrusion direction of the extruded dough 79 to about one-third of the length of the molding chamber 22 and the melting portion in which the heater 14 is arranged on the outer periphery thereof. 21a is formed,
The cooling pipe 25 is disposed on the outer periphery of the other portion to form the slow cooling portion 21b.

One or both of the forming chambers 22 are provided with heating and cooling means, and the upper and lower two metal plates 2 are provided.
6 and 27 are formed in a rectangular cross section through metal spacers 28 arranged on both side edges.
The height of the molding chamber 22 can be changed by exchanging either or both of 6 and 27.

As an example, by exchanging the upper metal plate 26, the height of the molding chamber 22 of the molding die 10 becomes the same as the height of the inlet 11 of the molding die 10 [FIG. 2 (A)]. FIG. 2 shows an example in which the state is lower than the entrance 11.
It shows in (B). In this way, by changing the upper metal plate 26, the forming chamber 12 of the forming die 10 is gradually changed into a narrow cross-section toward the slow cooling portion 21b of the forming die 10, so that the inlet 11 of the forming die 10 is changed. Since the height of the molding chamber 22 and hence the thickness of the product can be changed without changing the height, the height of the discharge port of the extrusion die 19 and the height of the inlet 11 of the molding die are always substantially the same. Can be configured.

As described above, the height of the discharge port of the extrusion die 19 is always the same as the height of the inlet 11 of the molding die 10, so that the extrusion die 19 is not replaced every time the composite plate to be molded is replaced. The extruded dough 79 in which the reinforcing material 45 such as glass fiber or plastic fiber and the cellulosic crushed material such as wood powder are dispersed and whose fluidity is lowered can be easily discharged into the molding chamber 22. Discharge port and molding die 10
It is possible to prevent clogging of the vicinity of the entrance 11 by the extruded material. Furthermore, since the melted portion 21a of the molding die 10 has a shape that gradually compresses the extruded dough 79 toward the slow cooling portion 21b of the molding die 10, the fluidity of the extruded dough 79 is improved, and
Reinforcement material 45 with uniform and high density synthetic wood board
Also, the compaction and adhesion between the crushed cellulosic material such as wood powder and the thermoplastic resin molding material are improved, and a synthetic plate having high strength can be obtained.

In this embodiment, the molding chamber 22 of the molding die 10 has an elongated rectangular cross section with a width of 550 mm and a height of 13 mm [FIG. 2 (A)].

The melting portion 21a of the molding chamber 22 has a so-called coat-hanger type in which both ends of which the cross-sectional shape is curved and extended in the width direction of the molding die 10 extend to both ends in the longitudinal direction of the molding chamber 22. Formed (FIG. 3).

The melting section 21a may be formed in a straight manifold type in addition to the coat-hanger type, but the extruded material 79 flowing in the melting section 21a has excellent fluidity. The above-mentioned curved coat-hanger type is preferable. As an example, the molding die 10 has an elongated rectangular cross section with a width of 550 mm and a height of 13 mm, and the distance from the inlet of the molding chamber 22 to the die outlet 23 (distance in the extrusion direction) is 1,000 mm.

Next, the structure inside the molding die will be described.
The inner wall surfaces of the molding chamber 22 in the upper, lower, left, and right directions have a thickness of 0.2.
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, and the fluororesin includes Teflon TFE, Teflon FEP, Teflon CTFE, Teflon VdF, etc., as described above. The woven glass fabric may be a non-woven fabric of glass fibers.

The above-mentioned fluororesin coating may be applied to 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 reinforcing resin composite plate, but as described above. Further, it is desirable to apply it to the entire inner wall surfaces of the molding chamber 22 in the upper, lower, left and right directions.

In FIGS. 2 and 3, 14 is a heater,
In order to maintain the fluidity of the extruded material 79 by heating the extruded material 79 by heating means such as an electric heater, the upper and lower two metal plates 26, 27 forming the molding die 10 are
One third in the longitudinal direction from the melting part 21a to the slow cooling part 21b
It is arranged over. The heater 14 may be provided only on one of the two upper and lower metal plates 26, 27, or may be provided on the outer wall of the molding die 10.

Further, in FIG. 2, reference numeral 25 is a cooling pipe, which shows an example of a cooling means for cooling the molding chamber 22 of the molding die 10, and at a proper interval in the extrusion direction of the molding chamber 22,
Cooling liquid serving as a cooling medium such as water at room temperature or water up to about 70 to 80 ° C. or oil is supplied to the cooling pipe 25 to cool the extruded dough 79 in the molding chamber 22. In order to improve the gradual cooling effect of the extruded material 79 in the molding chamber 22, the cooling pipe extends over two-thirds in the direction of the die outlet 23 of the molding die 10 so that the upper and lower two metal sheets of the molding chamber 22 are separated from each other. Boards 26,2
Pipes are installed by inserting 8 pieces into each of 7 pieces at equal intervals.
The cooling pipe 25 may be arranged only on either one of the upper and lower two metal plates 26, 27, or the installation interval thereof may be gradually narrowed, or the cooling pipe 25 may be formed by a molding die. Although it can be arranged on the outer wall of 10, it is not limited to the structure of this embodiment as long as the extruded material 79 in the molding chamber 22 can be cooled.

1-4. [Operation in Molding Die 10] The extrusion material 79 extruded from the extrusion die 19 of the adapter 17 connected to the extruder 70 is the inlet 1 of the molding die 10.
1, and flows in the width direction of the molding chamber 22 of the molding die 10. When the molding die 10 is empty, the area near the boundary between the melting portion 21a and the gradual cooling portion 21b of the molding chamber 22 is closed by a wood synthesis plate or the like which reaches the braking means 30 which will be described later, so that the inflow is prevented. The extruded dough 79 is laminated in the height direction of the molding chamber 22 in the melting portion 21a at an early stage, and the braking means 30 exerts a suppressing force against the extruding force on the extruding dough 79 to increase the density of the extruding dough 79. You can

The extruded material 79 is the melting portion 21 of the molding chamber 22.
When extruded into a, the width of the melting portion 21a of the molding chamber 22 is suddenly widened, so the extruded dough 79 flowing in the melting portion 21a maintains a good kneading state, and the crushed cellulosic material and the reinforcing material 45 are retained. Extruded in a uniformly dispersed state.

Thereafter, the extruded material 79 is introduced into the slow cooling section 21b of the molding chamber 22, and is cooled and hardened by the cooling water flowing through the cooling pipe 25 in the slow cooling section 21b.

In this way, the gas is introduced into the slow cooling section 21b,
The above-mentioned reinforcing material 45 is dispersed in the extruded dough that has started to be hardened.
9 is hardened with the reinforcing material 45 dispersed therein to form a wooden synthetic board, which is extruded by the extruded cloth 79. In this way, the extruded dough 79 extruded into the slow cooling part 21b of the forming chamber 22 is cured in a state where the reinforcing material 45 is uniformly dispersed to form a reinforced wood composite plate having a wall thickness of 12 mm. It This reinforced wood-synthesized board has high strength as compared with one in which the reinforcing material 45 is not dispersed.
Particularly, in the reinforced wood synthetic board molded by the extrusion molding method and apparatus of the present invention, the reinforcing material 45 is already dispersed in the resin at the stage of heating and kneading by the extruder 70, and the reinforcing material 45 is similar to the thermoplastic resin. As the temperature changes, the compatibility between the thermoplastic resin molding material and the reinforcing material 45 is extremely good, and the reinforcing material 45 in the resin cured by the subsequent slow cooling is strongly welded to the resin and has an extremely high strength. Obtainable.

In the process in which the extruded material 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 four directions, that is, the extruded material 79. 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 a metal. And operates as shown below.

Since the surface of the fluororesin is smooth and the coefficient of friction is small, the cellulosic crushed material such as wood powder and the reinforcing material 45 such as glass fiber in the extruded material 79 passing through the molding chamber 22 receive a large resistance. It flows without. Therefore, the kneaded state of the extruded dough 79 is maintained in a good state, and the cellulosic crushed material and the reinforcing material are dispersed, and as a result, the density is uniform and no cavities are formed, and the surface is smooth and high-quality reinforced resin synthesis A board is created.

In the slow cooling part 21b in the molding chamber 22, the extruded dough 79 is cooled, so that the fluidity of the extruded dough 79 deteriorates, and the wood powder and the reinforcing material 45 in the extruded dough 79 have a friction resistance higher than that of resin. In the conventional T-die type molding die 10, since the inner wall surface of the molding die 10 also has a large frictional resistance, in the case of a wood synthetic board, the wood powder flowing by contacting the inner wall surface of the molding die 10 is large. Since it receives resistance and does not flow smoothly, it has an adverse effect such as making the kneaded state of the extruded dough 79 dense and dense and forming cavities. However, in the molding die 10 of the present invention, the inner wall surface of the molding chamber 22 is By sticking the fluorocarbon resin sheet 24 having a smooth surface and a small friction coefficient, the wood powder of the extruded material 79 and the reinforcing material 45 receive a large resistance even when they come into contact with the inner wall surface of the molding chamber 22. Without smoothly flowing, extruded dough 7
The extruded dough 79 is extruded from the inside of the molding chamber 22 in a good kneading state of uniform and high density without adversely affecting 9 as described above.

Further, as described above, in the production of the wooden synthetic board, the resistance to the wood powder and the reinforcing material 45 in the extruded dough 79 becomes small and the extruded dough 79 is formed with a uniform density. The surface of the reinforced wooden synthetic board, which is the synthetic board 29, is finished to a smooth surface without so-called rough skin. Further, conventionally, since the wood powder in the extruded dough 79 does not flow smoothly in the molding die 10, the wood powder is burned and discolored to dark brown by the heat of the heater of the molding die, but the present invention is as described above. Since the wood powder of the extruded dough 79 flows smoothly, the wood powder is not burned and the quality characteristics such as impact resistance do not deteriorate.

Further, since the fluororesin has a lower thermal conductivity coefficient than metal, it has an effect of gradually cooling the extruded material 79 without rapidly cooling it, and has an effect of suppressing the distortion of the extruded material 79 due to the rapid cooling. .

In addition, the slow cooling section 21b of the molding chamber 22
Since the cooling means such as the cooling pipe 25 is provided in the extruding machine, it is not necessary to cool the synthetic plate with a cooling roll or the like and to remove the distortion with a correction roll after the 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, the extrusion molding method of the reinforcing resin synthetic plate of the present invention does not cause distortion such as warpage or twisting over time, which occurs in the resin synthetic plate molded by the conventional extrusion molding method or calender molding method.

In the extrusion molding method using a so-called T-die type molding die, the extrusion material 79 kneaded by the extruder 70 is transferred from the extrusion die 19 having a relatively small diameter to the molding portion having a narrow and elongated rectangular shape. And the introduction chamber 1
Since it flows in 2 and then flows in a narrow molding chamber 22 for a relatively long distance, in a conventional extrusion molding method using a so-called T-die type molding die, a resin containing a large amount of wood powder or a reinforcing material 45 is mixed. However, the present invention makes full use of the excellent properties of the fluororesin as described above, and thus the present invention is a wooden synthetic board containing a large amount of wood powder and a reinforcing material by a so-called T-die type molding die. Can be extruded.

1-5. [Suppression of Extrusion of Synthetic Plate] The extruding force of the synthetic plate 29 is increased by applying a resistance force to the synthetic plate 29 extruded from the die exit 23 of the molding die 10 by the braking means 30 in the direction opposite to the extruding direction. Suppress. Hereinafter, an embodiment of the braking means 30 will be described with reference to the drawings.

In FIG. 5 and FIG. 6, bearings 34a that support both ends of the shafts of the three free pinch rollers 31b are fixed to the bearing fixing frame 36, and the fixed pinch rollers 31a and the gear 116 provided on each shaft. The gear 117 meshing with the gear 116 is interlocked to connect the input shaft of the powder brake 115 to the shaft of one fixed pinch roller 31a among the three fixed pinch rollers 31a. 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, two block-shaped guide bodies 119 each having a guide groove on the wall surface of the frame 114 are provided, and the axial direction of the guide body 119 is set in the vertical direction. Bearings 34b that are provided substantially parallel to each other and that support the ends of the shafts of each 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 to the frame 114. Are connected to the tips of rods of three air cylinders 118 provided on the upper surface of the.

Therefore, by the operation of the cylinder 118, the fixed pinch rollers 31a are pressed by the three free pinch rollers 31b through the reinforced wood composite plate 29, respectively.
The rotation of the shaft of one fixed pinch roller 31a among the three fixed pinch rollers 31a is suppressed by the powder brake 115, and the gear 1 provided on the shaft of this fixed pinch roller 31a.
Since 16 meshes with gears 116, 116 provided on the shafts of the other two fixed pinch rollers 31a, 31a via gears 117, 117, three fixed pinch rollers 31a
The same rotation restraining force due to the friction torque of the powder brake 115 acts on these.

Incidentally, the friction torque for suppressing the rotation of the fixed pinch roller 31a by the powder brake 115 is
It is adjusted according to the plate thickness of the reinforced wood composite plate 29 to be formed.

Therefore, the friction torque of the powder brake 115 serves as a restraining force against the pushing force of the reinforced wood composite plate 29, and the pushing material 79 in the introducing chamber 12 of the molding die 10 is used.
Is made even more dense and uniform, and this uniform and high-density extruded dough 79 moves forward against the restraining force of the brake means 30 by the extruding force of the extruded dough 79 by the extruder 70, Then, the reinforced wooden synthetic board 29 is cooled and molded. The reinforced wood composite plate 29 moves forward while rotating the fixed pinch roller 31a and the free pinch roller 31b against the restraining force of the powder brake 115.

The restraining force exerts a resistance against the pushing force of the extruded dough 79 in the forming chamber 22 applied by the extruder to the extruded dough 79 in the forming chamber 22 and the introducing chamber 12 through the reinforced wood composite plate 29. By supplying, the density of the entire extruded material 79 in the molding chamber 22 becomes more uniform and high. Since the density of the extruded cloth 79 is increased by applying the restraining force to the reinforced wood composite plate 29, the reinforcing material 4
5 and the extruded cloth 79 are improved in adhesion, and bubbles and cavities are not generated in the synthetic plate. Therefore,
A more uniform and high density reinforced wood composite board is formed.

2. Production Example of Reinforced Wood Synthetic Board Next, a production example of the reinforced wood synthetic board of the present invention, particularly raw materials will be described. The extrusion molding method and apparatus of the reinforced wood synthetic board of the present invention is not limited to the following production examples, and in particular, the raw material charged into the extruder 70 was produced by the following method and apparatus. It is not limited to one.

The raw materials used for the reinforced wood-synthesized board of the present application include a mixture of a thermoplastic resin molding material and a cellulosic crushed material (“wood-synthesized powder” described later) and a reinforcement material, as well as urea, calcium carbonate, and oxidation. It consists of additives such as titanium and pigments.

Each of these will be described below.

2-1 [Additives] As described above, the reinforced wood synthetic board of the present application is a mixture of a thermoplastic resin molding material and a cellulosic crushed material (“wood synthetic powder” described later) and other reinforcement materials. , Additives can be added.

Of these, the above-mentioned calcium carbonate brings good dimensional stability to the reinforced wood-synthesized template of the present production example and contributes to remarkably reducing expansion and contraction due to temperature change. Prevents product deformation,
In addition, since it is inexpensive in itself, it has significance as a filler. 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.

2-2 [Thermoplastic resin molding material] As the thermoplastic resin molding material, various discarded resin moldings can be collected and used. The recovered thermoplastic resin molding material can be used as it is,
If the surface of the recovered resin molded product is coated with a resin coating, it is crushed into a plurality of small pieces, and a compression grinding action is added to each of the crushed individual small pieces. Grinding and peeling the resin coating and applying a compressive impact force based on microvibration to each of the ground small pieces to crush and crush, and the resin coating peeled by crushing and crushing at any time Removed and made into thermoplastic resin molding material, PVC
(Polyvinyl chloride), PET (Polyester), PP
A thermoplastic resin molding material such as (polypropylene), PC (polycarbonate), nylon, or ABS resin is obtained.

Then, one kind of the thermoplastic resin molding material thus obtained or a mixture of a plurality of these materials is used as a raw material.

As the thermoplastic resin molding material, recycled thermoplastic resin molding material obtained from waste material of the thermoplastic resin product is reused, or virgin thermoplastic resin molding material is used alone, Alternatively, the virgin thermoplastic resin molding material and the recovered thermoplastic resin molding material,
For example, 50% of each may be mixed and used.

2-3 [Mixing of thermoplastic resin molding material and cellulosic crushed material] The thermoplastic resin molding material thus obtained is a cellulose crushed material (wood powder is used in this example). And mixed with it to form a woody synthetic powder described later.

2-3-1 [Mixing Ratio of Thermoplastic Resin Molding Material and Wood Flour] The range of the amount of gelling wood powder in each thermoplastic resin molding material is shown below.

When the thermoplastic resin molding material is PP, the wood powder is 35 to 75 wt% and the PP amount is 25 to 65 wt%, preferably the wood powder is 60 to 75 wt% and the PP amount is 25 to 40 wt%.
%, And when the thermoplastic resin molding material is PET, the same as in the above PP, when the thermoplastic resin molding material is PC, the wood powder is 40 to 70 wt% and the amount of PC is 30 to 60%.
wt%, preferably 60-65 wt% wood flour, 35-40 wt% PC, 64 wt% wood flour, 3 PC
Particularly preferably, it is 6 wt%. When the thermoplastic resin molding material is PVC, wood powder is 30 to 65%, and the amount of PVC is 3
5 to 70 wt%, preferably 45 to 55 wt% wood flour,
The amount of PVC is 45 to 55 wt%, and when the thermoplastic resin molding material is nylon, it is the same as in the case of PC.

2-3-2 [Method of Mixing Thermoplastic Resin Molding Material and Cellulose Crushed Material] (1) Fluid Mixing and Kneading Treatment The raw materials blended as described above are placed in a mixer 80 shown in FIG. When charged, the raw materials are kneaded in the mixer 80 to become a “kneading material”.

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 the 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) toward the upper side 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. 9, 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 rotates 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 main body 81.

(2) Cooling / Granulation Treatment In FIG. 10, 100 is a cooling granulation means for mixing the above-mentioned kneading materials and stirring to form “granulated wood powder”. In this embodiment, “cooling mixer” is used. ".

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. An unillustrated exhaust duct for water vapor 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 driven to rotate at a speed of about 3 rpm by 1. 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 high-speed fluid mixer 80 is connected to the charging port 113.

The kneading material formed by the above-described high-speed flow type mixer 80 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 moved by the motor 105 to 90
Since the arm 103 rotates at a speed of 3 rpm and the arm 103 rotates horizontally at a speed of 3 rpm by the rotational force of the motor 111 that has been decelerated by the speed reducer 112, the stirring and crushing blade 104 has an inner circumference of the mixer main body 101. The kneaded material in the arm 103 is agitated by rotating so as to draw a cone along the wall surface. 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,
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, but since it is mixed with wood powder, 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, as the thermoplastic resin molding material, the melting temperature of PP used in this example was about 200 ° C., and in this example, it gelled at 205 to 215 ° C. in the high-speed fluid mixer 80 described above. 90 minutes after the kneading material is put into the cooling mixer 100 for about 10 to 15 minutes.
Cooled to ~ 100 ° C. Cooling granulation by this cooling mixer is efficient. Regarding the cooling water in the jacket 102 at this time, the temperature of the cooling water supplied from the water supply pipe 108 was 30 ° C., but the drain pipe 109
The temperature of the drained cooling water was 40 ° C.

The cooling granulation step is not limited to the one using an apparatus such as the above cooling mixer, and a stirring blade for stirring the kneaded material in the mixer body is provided and the outer peripheral wall surface of the mixer body is described above. Such a jacket may be provided, and the kneading material in the mixer main body may be cooled by cooling water flowing in the jacket. The kneading material formed by the high-speed fluid mixer 80 may not be provided in the jacket 102 in general. It is also possible to cool only by stirring using a different mixer, and any means can be used as long as cooling and granulation are performed.

(3) Grain sizing treatment The granulated wood powder formed in the cooling granulation step is further sized using a sizing means into pellets having a particle size of 10 mm or less,
Form "wood synthetic powder".

In FIG. 11, 120 is a sizing means for sizing the above-mentioned granulated wood powder, which is called a "cutter mill" in this embodiment.

A cutter mill body 121 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.

Further, inside 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 cut into ~ 8 mm wood synthetic powder, passes through the mesh of the screen 129 of the sizing chamber 128, and is discharged from the discharge port 131 to produce pellet-shaped "wood synthetic powder".

2-4 [Mixing of Reinforcing Material and Woody Synthetic Powder] The pelletized woody synthetic powder thus produced is
Glass fiber, polyester, nylon, plastic fiber such as Kevlar, carbon fiber, steel fiber, wood fiber, pulp fiber having a length of 10 to 30 mm of 3 to 30 wt% with respect to 70 to 97 wt% of the synthetic wood powder. After being agitated by a stirrer with a reinforcing material 45 made of cotton fiber or the like, it is sent to the extruder 70 in the next step. As the stirrer, a stirrer rotating at a low speed of 20 rpm is used, and the stirrer is stirred for about 3 minutes,
It is possible to prevent the fibrous reinforcing materials 45 as described above from being entangled with each other or being twisted and curled, and are mixed with the synthetic wood powder in a good state.

An example of the mixing ratio in which the reinforcing material 45 is dispersed in the wood-made synthetic board in a good state and which is sufficient for reinforcing the synthetic board is as follows.

[0107]

[Table 2]

The synthetic wood powder thus mixed with the reinforcing material is put into the extruder 70 and molded by the above-described extrusion molding method and apparatus to manufacture a reinforced resin composite plate.

3. Comparative Example Table 3 shows the results of the bending elastic modulus and the bending strength test of the reinforced synthetic wood board of the present application (hereinafter referred to as the present application) obtained by the extrusion molding method and apparatus for the reinforced resin composite board of the present invention described above.

The comparison results shown in Table 3 show that as Comparative Example 1, polypropylene (PP) resin 49 wt% and wood flour 44 wt
%, Length 20 mm to 30 mm, thickness 20 μm, polyester single fiber 7 wt% mixing ratio of wood synthetic powder and reinforcing material using 50 mm extruder (7.5 kw motor, rotation speed 15 rpm, extrusion rate 30 kg / h) 12mm thick x 91 wide
It is a reinforced wood composite board with a length of 0 mm and a length of 1820 mm.

On the other hand, as a comparative sample, a wooden synthetic board in which no reinforcing material is dispersed (other conditions are the same as those in Comparative Example 1) Plywood A (thickness 11. 2 mm) Plywood B laminated with 5 layers of wood board (plate thickness 11.6 mm) Plywood C laminated with 7 layers of wood board (plate thickness 15.3 mm) was subjected to the following test.

(1) Flexural modulus and flexural strength test Test conditions: fulcrum spacing: 100 mm, test speed: 5
mm / min

[0113]

[Table 3]

From the above comparison results, the reinforced wood composite board of Comparative Example 1 is slightly inferior to the plywood A in bending strength in the longitudinal direction, but the other test results are higher than those of the other plywood. Could be measured.

As is clear from Table 1, Comparative Example 1
It can be seen that the reinforced wood-synthesized board of No. 2 shows higher numerical values in bending modulus and flexural strength both in the longitudinal direction and the lateral direction as compared with the wood-synthesized board in which the reinforcing material is not dispersed.

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

[0117]

[Table 3]

From the above, the surface impact value of the reinforced wood-synthesized board of Comparative Example 1 is higher than any of plywood A, plywood B, and plywood C. Moreover, the wood-impregnated wood sheet in which the reinforcing material is not dispersed is It can be seen that the surface impact value is improved even by comparison.

(3) Hardness test Test conditions Rockwell hardness indenter; steel ball with a diameter of 12.700 mm Test load: 60 kgf

[0120]

[Table 6]

From the above, the Rockwell hardness of the reinforced wood-synthesized board of Comparative Example 1 was higher than that of any of plywood A, plywood B and plywood C. The reinforced wood composite board of Comparative Example 1 was about 1.42 times as large as plywood A and about 1.9 as large as plywood B.
It has excellent hardness of 6 times and about 3.39 times that of plywood C.

(4) Water Content Test Test Conditions Each test piece was immersed in pure water, and the mass change rate (= water content) after standing at 25 ° C. for 24 hours was measured.

[0123]

[Table 7]

From the above, the water content of the reinforced wood synthetic board of Comparative Example 1 was much lower than that of any of plywood A, plywood B and plywood C. When the water content is large, the rate of change of expansion and contraction of the plate becomes large, that is, the dimensional change of the plate becomes large due to environmental changes such as humidity, which becomes a factor that cracks and dimensional deviation of the plate are likely to occur.

Since the reinforced wood-synthesized board of Comparative Example 1 shows an extremely low water content of 1/153 even for the plywood A having the lowest water content among the above-mentioned three kinds of plywood, the humidity is low. The dimensional stability is extremely high regardless of changes in the environment.

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

[0127]

[Table 8]

From the above, the nail pull-out strength of the reinforced wood-synthesized board of Comparative Example 1 was higher than that of either plywood A or plywood C. Generally, the low nail pull-out strength of synthetic wood powder is a unique weakness of synthetic wood boards. 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 fiber-reinforced wood composite board of Comparative Example 1 has a nail pull-out strength of plywood C of about 1.4.
The good result of having 4 times the strength was obtained.

In the case of the wooden synthetic board, the nail pull-out strength is increased by increasing the density between the individual wood powders, and the reinforced wooden synthetic board of Comparative Example 1 has a high density and It is considered that since the reinforcing material is uniformly dispersed in the slab, the frictional resistance between the nail and the wood-made synthetic plate is increased, and good results are obtained as described above.

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

[0131]

[Table 9]

From the above, the pull-out strength of the wood screw of the reinforced wood-synthesized board of the present invention shown in Comparative Example 1 was higher than any of plywood A, plywood B and plywood C. Further, the hooking strength of the wood screw of the reinforced wood-synthesized board of Comparative Example 1 was higher than that of plywood A, plywood B, and plywood C in both the longitudinal direction and 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 reinforced wood-based synthetic board of the present invention, since the wood powder is uniform and has a high density, the adhesion between the individual wood powders is strong, and the reinforcing material is dispersed in the composite board. It is considered that the excellent results that the pulling strength and the pulling strength of the wood screw, which are caught by the reinforcing material, are higher than those of the plywoods were obtained.

As shown by the results of each of the above tests, the reinforced wood-based synthetic board of Comparative Example 1 had a flexural modulus, a flexural strength, a surface impact value, a water content, a nail pull-out strength, a wood screw pull-out strength and a wood screw. It is a good one showing excellent characteristics in the hooking strength.

[0136]

EFFECT OF THE INVENTION By dispersing the reinforcing material by the method and apparatus of the present invention to form a predetermined thickness, and when the extruded dough is gradually cooled in the forming chamber, the extruded dough is resistant to the extruding force. By increasing the density of the extruded dough by adding the restraining force, the adhesiveness between the reinforcing material and the resin can be increased, and the reinforcing resin composite plate with high strength can be provided. Since the suppression force is applied, it is possible to prevent the generation of bubbles, cavities, etc., and it is possible to provide a uniform and high-density reinforced resin synthetic plate.

Since the synthetic wood powder and the reinforcing material are stirred and mixed by a low-speed rotating stirrer and then put into the extruder, the reinforcing material is uniformly dispersed in a good state in one step of extrusion molding. The reinforced wood composite board could be molded.

By sticking a fluororesin sheet or coating the fluororesin on the inner wall of the molding chamber of the molding die, the fluororesin has a small coefficient of friction, so that the crushed cellulosic material and the reinforcing material cause fluidization. Even extruded dough with reduced properties can be smoothly fluidized,
Further, since the cellulose-based crushed product, the reinforcing material and the thermoplastic resin flow in a kneaded state with a thermoplastic resin molding material in a good state, the surface of the reinforcing resin synthetic plate which is a synthetic plate as a product does not have skin roughness, It was possible to form a reinforced synthetic resin plate having a smooth surface. In addition, the cellulosic crushed material and the reinforcing material in the extruded dough were allowed to flow smoothly, whereby a uniform and high-density reinforcing resin synthetic plate could be provided.

Since the screw of the extruder was extended from the base to the tip to reduce the depth of the groove, it is possible to satisfactorily extrude the extruded dough whose fluidity is lowered due to the mixture of the cellulosic crushed material such as wood powder and the reinforcing material. Moreover, by making the injection port of the extrusion die substantially the same height as the height of the inlet of the molding die, good flowability is imparted even to an extruded dough containing a cellulosic crushed material and a reinforcing material. It is possible,
It was possible to prevent clogging of the extrusion die.

The wood-based synthetic powder has a good compatibility with the cellulosic crushed material and the thermoplastic resin molding material, and the thermoplastic resin molding material adheres to the entire surface of the cellulosic crushed material and is thermally
Friction resistance of the cellulosic crushed material in the extruded dough during extrusion molding, because a synthetic wood powder that is dispersed so as to be able to constantly maintain the state of being immobilized in chemically stable wood flour granules is formed. The thermoplastic resin molding material and the cellulosic crushed material and the reinforcing material are kneaded in a well-dispersed state and extruded while maintaining a good kneading state. I was able to get it.

Since the extruding temperature of the extruded material is set to a temperature lower than the melting temperature of the thermoplastic resin molding material alone, it is possible to use plastic fibers of the same material as the thermoplastic resin molding material as the reinforcing material to be dispersed. And the thermoplastic resin molding material are extremely familiar.

Further, since the extrusion temperature of the extruded dough can be set low, the reinforcing material dispersed in the extruded dough is not easily deteriorated by heat, and the extruded dough of the extruded dough discharged to the slow cooling part of the molding chamber is formed. Since the temperature is low, the cooling is easy.

Since the height of the molding chamber of the molding die can be changed without changing the height of the entrance of the molding die, even when the thickness of the wood synthetic board to be manufactured is changed, the discharge port of the extrusion die is changed. The height of the mold and the height of the inlet of the molding die can always be the same, and it is possible to prevent clogging of the extruded fabric and
It is not necessary to replace the extrusion die in order to make the heights of the ejection opening of the extrusion die and the entrance of the molding die the same.

Since the reinforced resin synthetic plate of the present invention can be obtained by extrusion molding to obtain a synthetic plate having a desired thickness, it can be used for various purposes and methods such as concrete panels, various building materials, and interior / exterior parts of automobiles. It was possible to provide a synthetic board that could be used.

Since the wood synthetic board molded by the extrusion molding method and the extrusion molding apparatus of the present invention has a high density and is reinforced by the reinforcing material, a large amount of wood powder can be mixed in without impairing the strength. Since wood flour is less than half price and much cheaper than thermoplastic resin molding materials, inexpensive wood synthetic boards can be formed, and wood synthetic boards mixed with a large amount of wood powder have properties close to those of natural wood panels. It was possible to provide an excellent synthetic board.

[Brief description of drawings]

FIG. 1 is a front view showing a partial vertical section of an extruder according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a molding die according to an embodiment of the present invention,
(A) is a metal plate for forming thick plates, (B) is a metal plate for forming thin plates (2
6) Shows a state where the replacement is made.

FIG. 3 is a cross-sectional view of a molding die according to an embodiment of the present invention.

FIG. 4 is a perspective view in which a metal plate (upper side) of the molding die of the embodiment of the present invention is omitted.

FIG. 5 is a plan view showing a cross section of a main part of the braking means of the embodiment of the present invention.

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

FIG. 7 is a vertical sectional view taken along the line JJ of FIG.

8 is a vertical cross-sectional view taken along the line KK of FIG.

FIG. 9 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. 10 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. 11 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.

[Explanation of symbols]

 10 Molding Die 11 Inlet (Molding Die) 14 Heater 16 Screen Part 17 Adapter 18 Inlet 19 Extrusion Die 21a Melting Part 21b Slow Cooling Part 22 Molding Chamber 23 Die Exit 24 Sheet (of Fluorine Resin) 25 Cooling Tube 26 Metal Plate ( Upper side 27 Metal plate (lower side) 28 Spacer 29 Composite plate 30 Brake means 31 Pinch roller 31a Fixed pinch roller 31b Universal pinch roller 34a, 34b Bearing 36 Bearing fixed frame 45 Reinforcement material 70 Extruder 71 Screw 74 Barrel 75 Band heater 76 Screen 79 Extruded dough 80 Mixer (fluid mixing and kneading means) 81 Mixer main body 82 Upper lid 83 Shaft 84 Scraper 85,86,87 Stirring impeller 88 Discharge port 89 Lid 91 Cylinder 92 Tightening nut 93 Discharge 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 Motor 112 Reduction gear 113 Input port 114 Frame 115 Powder brake 116 , 117 Gears 118 Cylinder 119 Guide body 120 Cutter mill (grinding means) 121 Cutter mill main body 122 Lid 123 Input port 124 Cutter support 125 Rotating blade 126 Fixed blade 127 Input chamber 128 Sizing chamber 129 Screen 131 Discharge port

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location B29C 47/86 9349-4F B29C 47/86 // B29K 105: 06 511: 14 B29L 7:00

Claims (11)

[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, a thermoplastic resin molding material of 25 to 80 wt% is mixed, gelled and kneaded, cooled and sized to form a synthetic wood powder. The synthetic wood powder and a reinforcing material are stirred and mixed, and the reinforcing material and the reinforcing material are mixed. The mixed wood powder that is stirred and mixed is heated and kneaded to form a dough, and this dough is extruded from the extrusion die to the molding chamber of the molding die, and the extruded dough is gradually cooled after being heated in the molding chamber, A method for extrusion-molding a reinforced synthetic wood board, which comprises increasing the density of the extruded fabric by applying a suppressing force against the extruding force of the extruder to the extruded fabric in the molding chamber to cure the extruded fabric. 2. The extrusion molding method for a reinforced wood-synthesized board according to claim 1, wherein the screw reduces the change in depth of the groove from the base to the tip to improve the fluidity of the extruded fabric. 3. The injection port of the extrusion die is formed in a square shape having the same height as or substantially the same height as the height of the entrance of the molding die, and the flow path of the extrusion dough formed in the extrusion die is extruded. The extrusion molding method for a reinforced wood composite board according to claim 1, wherein the extrusion dough is extruded into a molding chamber through an extrusion die formed so as to gradually change its cross section toward the injection port of the die. 4. A fluororesin sheet is attached or coated on the inner wall surface of the molding chamber.
3. A method for extrusion-molding a reinforced synthetic wood board according to any one of items. 5. The method of extrusion molding a reinforced wood-synthesized board according to any one of claims 1 to 4, wherein 3 to 30 wt% of a reinforcing material is mixed with 70 to 97 wt% of the wood-based synthetic powder. 6. The reinforcing material is one or more monofilament of glass fiber, plastic fiber, carbon fiber, metal fiber, pulp fiber, cotton fiber, or 1 or 2 above.
A method for extrusion-molding a reinforced synthetic wood board according to any one of claims 1 to 5, wherein a large number of the above-mentioned types of single fibers are converged or twisted together. 7. The reinforcing material is made of the same material as the thermoplastic resin molding material forming the synthetic wood powder, and is extruded by heating at a temperature lower than the melting temperature of the reinforcing material. The extrusion molding method of a reinforced wood synthetic board according to claim 6. 8. The extrusion molding method for a reinforced synthetic wood board according to claim 6, wherein the reinforcing material has a length of 10 to 30 mm and a single fiber diameter of 6 to 24 μm. 9. 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 sized to form a synthetic wood powder. The synthetic wood powder and a reinforcing material are stirred and mixed, and this mixed raw material is mixed. Heating, kneading, extruding die of the extruder that extrudes with a screw with a reduced change in the depth of the groove from the base to the tip, extruding the dough extruded from the extruding die and a melting part and a predetermined Connect a molding die with a molding chamber that has a slow cooling part that forms a thick wall and gradually cools, and a fluororesin sheet is attached or coated on the inner wall surface of the molding chamber and the molding chamber is heated. A reinforced resin composition characterized in that a heater and a cooling means for cooling the molding chamber are provided in the molding die, and a braking means for applying a restraining force against the extruding force of the extruded material extruded from the molding die is provided. Extrusion apparatus. 10. The injection port of the extrusion die is formed in a rectangular shape having the same height as or substantially the same height as the height of the entrance of the molding die, and the flow path of the extrusion dough formed in the extrusion die is formed by this injection. The extrusion molding apparatus for a reinforced wood-synthesized board according to claim 9, wherein the extrusion-molding apparatus is formed so that the cross-section gradually changes toward the outlet. 11. The molding die is composed of upper and lower two metal plates, and is an inner wall surface of either one or both of the upper and lower metal plates forming the molding die, the melting portion of the molding chamber being The inner wall surface to be formed is gradually and narrowly changed in cross section toward the slow cooling part of the forming chamber, and either one or both of the upper and lower metal plates can be replaced with metal plates having different inner wall cross-sectional shapes. The extrusion molding apparatus for a reinforced synthetic wood board according to claim 9 or 10.