JP2872590B2 - Extrusion molding method and apparatus for hollow resin molded plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for extruding a hollow resin molding plate using a thermoplastic resin molding material or a synthetic resin made of a thermoplastic resin and a woody synthetic powder composed of crushed cellulose. More specifically, building materials, automobiles, thermoplastic resin molding material having a hollow portion adapted to various applications such as interior and exterior parts of vehicles or a mixed raw material of thermoplastic resin molding material and cellulose-based crushed material, or a mixture thereof. The present invention relates to a method and an apparatus for extruding a hollow resin molded plate, which is formed by using an extruder to form a woody synthetic powder comprising a mixed raw material as a molding material into a molded plate having a predetermined thickness having a hollow portion.

In particular, one or both of the above-mentioned cellulosic crushed material and 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 diversification of daily life. The main purpose is to reduce the weight of the wood-based synthetic board by reusing the waste materials of various types of thermoplastic synthetic resin products that are used in large amounts and are discarded in large quantities for use as wood-based synthetic boards. As a means for forming a hollow portion.

[0003]

2. Description of the Related Art Conventionally, various devices such as an offset die for forming a hollow portion and a vacuum sizing device have been developed and used in the production of pipes and the like. As means for forming a hollow portion in a material, an extrusion compression molding machine or the like is used in addition to an extrusion blow molding machine using a blow mold, an injection blow molding machine, and so-called solidification extrusion molding has not been put to practical use.

The true specific gravity of wood flour, which is a main molding material of a conventional woody synthetic board, is 1.4, and the true specific gravity of a thermoplastic resin molding material is about 0.9 to 1.5 (depending on the material). Since there is, the conventional woody synthetic board formed by kneading these wood flour and the thermoplastic resin molding material is different depending on the mixing ratio of the wood powder and the thermoplastic resin molding material and the thermoplastic resin molding material,
The specific gravity becomes 0.97 to 1.48.

[0005]

The formation of a hollow portion by extrusion molding is experimentally performed, and is not impossible in theory. However, a hollow is formed on the surface of the hollow portion by rapid cooling. Met.

Further, as described above, the specific gravity of a plywood such as a plywood of a general wood is 0.45 to 0.45.
There is a problem that the true specific gravity of the wooden composite board is larger than that of 0.75), that is, the conventional wooden composite board is heavy.

By the way, as a thermoplastic resin molding material, PP
The true specific gravity of (polypropylene) is 0.90 to 0.91,
The true specific gravity of hard PVC (hard vinyl chloride) is 1.35-
1.45, and the majority of the thermoplastic resin molding material is 0.9.
１．５1.5, but vinylidene chloride (true specific gravity 1.68-1.75), fluororesin (true specific gravity 2.1
There is also a resin having a high true specific gravity as in -2.2). As an example, the specific gravity of a wood composite board formed by kneading 25 wt% of a thermoplastic resin molding material PP and 75 wt% of wood flour is about 1.23.

The present invention provides means for so-called solidified extrusion molding of a hollow resin molded plate, and was developed to solve the above-mentioned problems. It is intended to form a hollow portion in a thermoplastic resin molding material. Extrusion molding method, and mixed raw materials of cellulosic crushed material such as wood flour and thermoplastic resin molding material and these are mixed together by a stirring impact blade, gelled and kneaded by frictional heat, and pulverized to a particle size of 10 mm or less. The present invention provides a method and an apparatus for forming a hollow portion by using a sized and formed woody synthetic powder. In particular, in the latter two, an extrusion method and an apparatus for a hollow resin molded plate having a uniform density and a high density are provided. The purpose is to provide.

[0009]

In order to achieve the above object, a method for extruding a hollow resin sheet according to the present invention comprises heating a material, kneading the material, and using a screw to move the introduction portion of the molding die from the extrusion die. Via, if necessary, a fluororesin sheet was stuck on the inner wall surface or coated with fluororesin,
It is discharged to a forming die, rises from the guide section to a guide section provided in a width direction of the guide section at an introduction section of the forming die, protrudes in parallel with an extrusion direction, and gradually cools at least the forming chamber through a melting section. Forming the extruded dough extruded through the core extending to the part to a predetermined thickness and forming a hollow part,
The method is characterized by including at least a step of gradually cooling the extruded dough extruded into the forming die in the annealing section, and increasing the density of the extruded dough by applying a suppressing force against the extruding force to the extruded dough.

In the hollow resin molded board according to the present invention, the crushed cellulose resin having an average particle diameter of 20 mesh or less with a water content of 15 wt% or less. 20-75 wt% of the thermoplastic resin molding material was mixed with 25-80 wt% of the mixture with a stirring impact blade, gelled and kneaded by frictional heat, then cooled and pulverized to form a uniform particle size of 10 mm or less. It can be fed to a forming die as woody synthetic powder and extruded.

[0011] The woody synthetic powder volatilizes wood acid gas at the time of gelling and kneading and molding, reduces the generation of water vapor or bubbles, and reduces the water content to 15% by weight or less, with the intention of preventing surface roughening. It should be within 11 wt%, ideally within the range of 8 wt%.

Further, the extruded dough can be extruded into the forming die by heating at the introduction portion of the forming die.

The woody synthetic powder has a water content of 15% by weight.
Within the range of 20 to 75% by weight of a cellulose crushed product having an average particle size of 20 mesh or less, and
0 wt% are mixed together with a stirring impact blade, gelled and kneaded by frictional heat, then cooled and pulverized to form particles having a particle size of 10 mm or less.

The thermoplastic resin molding material is PVC, PE
T, PP, etc., all plastics recovered from waste resin moldings, or virgin plastic pellets mixed with these recovered resins in half each may be used. These thermoplastic resin molding materials and cellulose-based The mixing ratio of the crushed material is as follows: (1) When the thermoplastic resin molding material is PP, the above-mentioned cellulosic crushed material is mixed up to 75 wt% at a maximum, and the range of mixing the cellulosic crushed material is 20 to 75 wt%. %, Preferably 30 to 70% by weight, but preferably 30 to 70% by weight.
65% by weight. (2) When the thermoplastic resin molding material is PET, the crushed cellulosic material is mixed up to 75 wt% at a maximum, and the mixing ratio of the crushed cellulosic material is preferably 20 to 60 wt%. Preferably, it is 35 to 50% by weight. (3) When the thermoplastic resin molding material is PVC, the mixing ratio of wood powder is 30 to 6
0 wt%, preferably 51 wt%.

Further, the extruded dough 79 is formed with a forming die 10.
And heated into the molding die 10 by heating.

It is preferable that the woody synthetic powder contains 60 to 75% by weight of wood flour as a crushed cellulosic material and 25 to 40% by weight of polypropylene or polyethylene as a thermoplastic resin molding material.

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

Further, a sheet of a fluororesin can be attached to the surface of the guide portion and the surface of the core body, or coated with a fluororesin. .

The fluororesin includes polytetrafluoroethylene (Teflon TFE; DuPont), fluoroethylene-propylene copolymer (Teflon FEP), polychlorotrifluoroethylene (Teflon CTFE), polyvinylidene fluoride (Teflon) VdF) can be used.

The method of coating the inner wall surface of the molding chamber 22 and the surface of the guide portion with a fluororesin is particularly excellent in durability because it is easy to replace and easy to process. It is preferable to attach a sheet 24 coated or lined with a fluororesin film on the surface of the glass woven fabric. Further, the glass woven fabric may be a nonwoven fabric of glass fiber.

In the apparatus for extruding a hollow resin sheet according to the present invention, the raw material is heated and kneaded, and the extruded material discharged from the extrusion die is heated to an extrusion die of an extruder that extrudes with a screw. Introducing section and a forming die having a forming chamber composed of a melting section and an annealing section for forming the extruded dough extruded from the introducing section into a predetermined thickness are connected, and the inner wall of the forming chamber is made of fluororesin. A cooling means for attaching a sheet or coating a fluororesin and cooling the molding chamber is provided on the molding die, and a guide provided at an introduction portion of the molding die is started up from the guide, and is passed through the melting portion. A core extending from at least the slow cooling portion of the molding chamber, and a braking means for applying a suppressing force against the pushing force of the molding plate extruded from the molding die. Characterized in that was.

The guide portion has a total length of 70 to 95% of the total length in the width direction of the introduction portion at the introduction portion of the forming die, and is provided at a height of 70% or less of the height of the introduction portion. In addition, the core body has a substantially comb-like shape as a whole, and has a molding guide part that is slightly more than half toward the tip from a guide plate formed in a rod-shaped member having a rectangular cross section provided integrally with the guide part. It can also be constituted by a pull-out guide part. Further, the forming guide portion of the core body is formed in a straight line at the same thickness at the center of the forming die with a thickness of 45% or less of the height of the forming die, and the core body is formed in parallel with the core body. It is preferable to arrange a plurality of rows at an interval of 4/7 of the width of.

Further, the core body withdrawal guide portion includes:
The both side edges of the plane can be formed in a tapered shape with a 1/1000 taper from the forming guide portion, and the brake means comprises a plurality of pairs of upper and lower pinch rollers for holding and pressing the front and back surfaces of the forming plate. It is possible to provide a configuration in which the shaft end of one pinch roller is connected to the input shaft of the powder brake, and the gears provided at the shaft end of each pinch roller are engaged. It is needless to say that the thermoplastic resin molding material is a resin such as those described above and may be used singly or as a mixture of some of them.

[0024]

According to the present invention, the raw material is raised from the guide to the guide provided in the width direction of the guide at the guide of the forming die, and the core is projected in parallel with the extrusion direction. Through, while being extruded from the melting portion to at least the slow cooling portion of the molding chamber, while forming the core portion in the hollow portion, while being gradually cooled, by the suppressing force against the extrusion force on the extruded fabric, It is formed to a predetermined thickness with a uniform density.

The core body is supported in a cantilever manner with respect to the guide portion, but is gradually cooled in a slow cooling portion in the forming die.
Since the die exit side is supported by the solidified extruded dough itself, the core is not deformed by the extruded dough.

If the core body is formed in a tapered shape in thickness and width from the molding guide part located in the melting part to the slow cooling part in the die exit direction, the core is formed during cooling and solidification of the extruded dough. The child body is smoothly extruded without any resistance to the pushing force.

First, the extruded dough 79 is heated and kept warm in the introduction section 11 to maintain fluidity and maintain a good kneading state. Prevents different linear expansions in the central part and the end parts from causing different molecular orientations, uniformizing the linear expansion, controlling the molecular orientations, and being evenly diffused into the molding chamber 22 and having a uniform density. Extruded. In the case where the inner wall surface of the molding chamber 22 is formed by sticking a fluororesin sheet 24 having a small coefficient of friction or coating with a fluororesin, the cellulosic crushed material in the extruded fabric 79 passing through the inner wall surface does not receive a large resistance. Since it flows smoothly, it is extruded while maintaining a uniform and high-density kneading state. In the process of being extruded in the molding chamber 22, the extruded material 79 is gradually cooled and cooled by a cooling medium such as water or oil at room temperature to 60 ° C. to 90 ° C. to form the hollow resin molded plate 29. Since the fluororesin has a lower thermal conductivity coefficient than metal, the extruded fabric 79 is gradually cooled, and the distortion due to cooling is reduced, and the hollow resin molded plate 29 as a uniform and high-density product without distortion is produced.
Is molded.

Further, a braking force is applied to the pushing force applied to the hollow resin molded plate 29 by the extruder by the brake means 30, and the molding chamber 2 is formed through the hollow resin molded plate 29.
By applying a drag against the above-mentioned extruding force to the extruded dough 79 in 2 and giving this drag, the whole of the extruded dough 79 in the molding chamber 22 is sufficiently wrapped around the core body to have a uniform and high density. Become.

Similarly, a hollow resin molded plate which is a more uniform and high-density woody synthetic plate containing a large amount of crushed cellulosic material is formed.

According to the present invention, even when a large amount of crushed cellulosic material is contained, the above-mentioned brake means allows the molten raw material to sufficiently flow around the core and promotes compaction.

[0031]

An embodiment will be described with reference to the drawings.
For the sake of convenience, a description will be made mainly of a production example of a crushed cellulosic material and a thermoplastic resin molding material, or a hollow resin molded plate made of a woody synthetic powder obtained by gelling, kneading, and pulverizing them.

Extruder In FIG. 1, reference numeral 70 denotes a single screw extruder. In general, the extruder is usually a screw type, and there are a single screw extruder and a multi-screw extruder. Some extruders can be used in the present invention.

Reference numeral 71 denotes a screw, which is a single-shaft type. The screw 71 is driven by a motor (not shown) via a gear reducer 72 and rotates in a barrel 74. The rotating screw 71 extrudes the front of the screw 71 while kneading the crushed cellulosic material and the thermoplastic resin material fed from the hopper 73. A band heater 75 is provided on the outer surface of the barrel 74, and the cellulosic crushed material and the resin in the barrel 74 are heated by the band heater 75, and gradually melted while being transported forward along the groove of the screw 71, and the cellulose crushed. The material and the resin are kneaded. Then, the extruded material 79 is extruded from the extrusion die 19 of the adapter 17 to the forming die 10 via the screen 76 and the adapter 17.

Extrusion Die In FIGS. 1, 9 and 10, the extrusion die 19 at the end of the barrel 74 has an elongated rectangular shape having a thickness of about 8 mm, a width of 50 mm, and an injection opening of 13 mm in height. (Refer to FIG. 10), the inside has a communication hole whose cross section is gradually deformed from the inflow port 18 having a diameter of 50 mm on the rear end face of the adapter 17 toward the injection port of the extrusion die 19. Inlet 1
8 is formed to have the same size as the injection port having a circular cross section of the extruder 70, while the rectangular width of the extrusion die 19 is formed to be the same as the diameter of the inflow port 18, and the height is set to the size of the molding die 10 described later. It is preferable to form the same size as the height of the molding chamber 22.

The adapter 17 and the extrusion die 19 can be formed in various sizes according to the size of the extruder 70. For example, when the diameter of the inflow port 18 is 150 mm, the rectangular width of the extrusion die 19 is reduced. The height may be 150 mm, and the height may be 13 mm, which is the same as the height of the molding chamber 22.

The rear end of the adapter 17 is
The extruder 70 has a screen 76 (FIG. 1) having a screen 76 (FIG. 1).
And the screen part of the extruder 70, while the tip of the extrusion die 19 has a rectangular cross-section leading end at an introduction part 11 having a rectangular cross-section formed substantially at the center of the rear end face of the molding die 10. The extrusion die 19 and the introduction portion 11 of the molding die 10 are communicated with each other.

Incidentally, a heater as a heating means may be embedded in the peripheral wall of the communication hole of the adapter 17. in this case,
The extruded fabric 79 extruded from the outlet of the screen unit 16 of the extruder 70 flows in from the inflow port 18 of the adapter 17, passes through the communication hole while being heated and kept warm by the heater, from the extrusion die 19 to the introduction part 11 of the forming die 10. Flows to The flow state of the extruded dough 79 is good. Moreover, unlike the general die, the extrusion die 19 is formed in a shape capable of discharging a large amount of molten raw material (woody synthetic powder) due to a large injection port and promoting compaction. The clogging of the die as in the case of the die does not occur.

Forming Die In FIGS. 2 to 5, reference numeral 10 denotes a forming die, which is an introduction section 11 for extruding an extruded material 79 discharged from an injection port of an extrusion die 19 having a rectangular cross section of an extruder 70; It comprises a molding chamber for molding the extruded extruded material 79 into a wide, plate-like sheet having a predetermined thickness. In this embodiment, the molding chamber 22 has a narrow rectangular cross section having a width of 550 mm and a height of 13 mm.

Reference numeral 11 denotes an introduction portion, which is formed in the forming die 10 in the width direction of the forming die 10 and is formed substantially equal to or slightly larger than the width of the extrusion die 19, and has a cross section in the width direction of the forming die 10. Both ends of the introduction chamber 13 which extends in a curved manner extend to both ends in the longitudinal direction of the molding chamber 22, and are formed in a so-called coat-hanger type.

The introduction chamber 13 may be formed as a straight / manifold type in addition to the coat hanger type. However, the flowability of the extruded cloth 79 flowing in the introduction section 11 and the introduction chamber 13 is excellent. In this respect, the above-mentioned curved coat hanger type is preferable.

Also, a sheet 24 made of a fluororesin described below is preferably attached to the introduction section 11 and the introduction chamber 13.

The molding chamber 22 is made of a metal (not shown) having upper and lower two metal plates provided with heating and cooling means and arranged on both side edges, and has a rectangular cross section. Is adjusted so as to obtain the desired thickness of the hollow resin molded plate.

The forming die 10 has a width of 550 m, for example.
m, forming a narrow rectangular cross section with a height of 13 mm.
The distance (distance in the extrusion direction) from the inlet of No. 2 to the die outlet 23 is 1,000 mm.

Structure Inside the Forming Die The inner walls of the forming chamber 22 at the upper, lower, left and right sides have a thickness of 0.2 mm.
A sheet 24 made of fluororesin of 5 mm is stuck. Alternatively, fluorocarbon resin may be directly coated on the inner walls of the upper, lower, left, and right sides of the molding chamber 22. However, since fluorocarbon resin is easily exchanged, fluorocarbon resin coating is easy, and the durability is high, the fluorocarbon resin is easily coated. It is particularly preferable to attach a resin sheet 24.

The sheet 24 is particularly preferably formed by coating a film of a fluorinated resin on the surface of a glass woven fabric. As described above, the fluorinated resin includes Teflon T
FE, Teflon FEP, Teflon CTFE, Teflon V
dF and the like. The glass woven fabric may be a nonwoven fabric of glass fiber.

The above-mentioned fluororesin coating can be applied to the upper and lower inner wall surfaces of the molding chamber 22, that is, the inner wall surfaces corresponding to the front and back surfaces of the hollow resin molded plate. It is desirable to apply it to the entire upper, lower, left and right inner wall surfaces of the molding chamber 22.

3 and 5, reference numeral 14 denotes a heater, which comprises heating means such as an electric heater.
In order to maintain the fluidity of the extruded dough 79, the upper and lower portions of the molding chamber 22 corresponding to the melting portion 21 a including the introduction portion 11 (FIG. 4) covering a quarter of the entire length of the molding die 10 (FIG. 4). Four pipes are inserted through the forming die 10 at equal intervals.

Reference numeral 25 denotes a cooling pipe, which is an example of a cooling means for cooling the slow cooling portion 21b of the molding chamber 22 of the molding die 10, and is provided at appropriate intervals in the extrusion direction of the molding chamber 22.
A cooling liquid as a cooling medium such as water at room temperature or water or oil up to about 70 to 80 ° C. is supplied to the cooling pipe 25 to cool the extruded fabric 79 in the molding chamber 22. In order to improve the slow cooling effect of the extruded dough 79 in the forming chamber 22, the cooling pipe is provided in the slow cooling section 21b, which occupies three-quarters toward the die outlet 23 of the forming die 10, in the forming chamber 22. The pipes are inserted through the upper and lower forming dies 10 at equal intervals. Note that the cooling pipes 25 can be provided so as to gradually narrow the gap therebetween, or the cooling pipes 25 can be provided on the outer wall of the forming die 10. However, it is sufficient that the extruded material 79 in the forming chamber 22 can be cooled. However, the present invention is not limited to the structure of this embodiment.

Core Body In FIGS. 2 to 5, the core body 40 has a base portion 44 having an arc-shaped cross section and an inclined portion 43 inclined toward the die outlet 23.
The core body 40 is provided integrally with the guide portion 15 including
A molding guide portion 41 which has a substantially comb-like shape and is formed into seven rod-shaped members having a rectangular cross section, and a substantially half of the guide portion 15 having a total length of 800 mm and a width of 35 mm located on the melting portion 21a and this molding. Slow cooling section 21b tapering 1/1000 from guide section 41 toward the die exit on both sides in the thickness and width directions.
And a pull-out guide portion 42 located at

The guide section is provided in the introduction chamber of the forming die so as to have a total length of 70 to 95% of the total length in the width direction of the introduction chamber, and at a height of 70% or less of the height of the introduction section. Also, from the guide portion 15 of the core body 40 to the tip die outlet 2
One quarter toward 3 is located in the melting section 21a of the molding chamber 22, and the other is located in the slow cooling section 21b.

Further, the forming guide portion 41 of the core body 40
Is formed linearly at the same thickness in the center of the forming die at a thickness of 45% or less of the height of the forming die, and the thickness of the drawing guide portion 42 is tapered toward the tip of the die outlet 23.

The cores 40 are arranged in a plurality of rows at intervals of 4/7 of the width of the cores 40 in the longitudinal direction of the molding chamber 22, that is, in parallel with the extrusion direction.

The guide portion 15 and the core body 40 are formed by attaching a sheet made of a fluororesin such as Teflon having a thickness of 0.1 to 0.5 mm on the entire outer surface. The guide portion 15 is provided in the introduction chamber 13 having a height of 13 mm and a width of 550 mm in the width direction of the introduction chamber 13 with respect to both side edges of the molding chamber in the width direction by 50 mm.
And the rear end of the guide portion 15 is positioned so as to be substantially parallel to the rear end wall surface of the introduction portion 11, and the guide portion 15 is placed on the forming die 10.
Then, as shown in FIG. 5, it is fixed to the lower surface of the introduction chamber 13 with bolts 27. Therefore, a gap is also formed between the upper surface of the guide portion 15 and the upper surface of the introduction hole 13.

The guide 15 and the core 40 are
The thickness, width, and interval can be appropriately selected according to the volume of the molding chamber 22.

Brake means In FIG. 8, bearings 34a bearing both ends of the shafts of the three free pinch rollers 31b are respectively fixed to a bearing fixing frame 36, and a gear 116 provided with the fixed pinch rollers 31a on each shaft. The input shaft of the powder brake 115 is connected to the shaft of one fixed pinch roller 31a of the three fixed pinch rollers 31a, as shown in FIG . The powder brake 115 is a so-called electromagnetic brake, and can finely adjust the friction torque electrically.

Further, a frame 114 is erected on the bearing fixing frame 36, and two block-shaped guides 119 each having a guide groove on the wall surface of the frame 114 are oriented in the vertical direction with the axis of the 119 being vertical. And the bearings 34b are provided substantially parallel to each other, and are provided so as to be vertically movable along the guide grooves of the guide body 119, and the bearings 34b are provided on the upper surface of the frame 114, respectively. Are connected to the tips of the rods of the three air cylinders 118 provided in the first and second cylinders.

Accordingly, the operation of the cylinder 118 presses each of the three free pinch rollers 31b onto the fixed pinch roller 31a via the hollow resin molded plate 29, thereby fixing one of the three fixed pinch rollers 31a. The shaft of the pinch roller 31a is suppressed from rotating by the powder brake 115, and the gear 116 provided on the shaft of the fixed pinch roller 31a is connected to the other two fixed pinch rollers 31a, 31.
The gears 117, 11 provided on the gears 116, 116 provided on the shaft
7, the same rotation suppressing force by the friction torque of the powder brake 115 acts on the three fixed pinch rollers 31a.

Incidentally, the friction torque for suppressing the rotation of the fixed pinch roller 31a by the powder brake 115 is as follows.
It is adjusted by the thickness of the hollow resin molded plate 29 to be molded.

Therefore, the friction torque of the powder brake 115 acts as a suppressing force against the pushing force of the hollow resin molded plate 29, and the extruded material 79 in the introduction portion 11 of the forming die 10 is formed.
Is made even more dense and uniform, and this uniform and high-density extruded fabric 79 is advanced by the pushing force of the extruded fabric 79 by the extruder 70 against the restraining force of the brake means 30, and And the hollow resin molded plate 29 is molded. The hollow resin molded plate 29 advances while rotating the fixed pinch roller 31a and the universal pinch roller 31b against the suppressing force of the powder brake 115.

The restraining force exerts a drag on the extruded material 79 in the molding chamber 22 and the introduction portion 11 through the hollow resin molding plate 29 against the extruding force of the extruded material 79 in the molding chamber 22 applied by the extruder. By giving, the density of the whole extruded material 79 in the molding chamber 22 becomes more uniform and high. Since the density of the extruded dough 79 is increased by applying the suppressing force to the hollow resin molded plate 29, generation of bubbles, nests, and the like is prevented. Therefore, a more uniform, high-density and lightweight hollow resin molded plate is molded.

The raw materials put into the hopper 73 of the extruder 70 are a crushed cellulosic material and a thermoplastic resin molding material.
In particular, the particle size of the wood powder is adjusted to be good for compatibility with the thermoplastic resin molding material, and the frictional resistance of the wood powder during molding extrusion is reduced to prevent wear and damage of the molding machine.
It is a fine powder having a mesh, preferably 60 (below the sieve) to 150 mesh (above the sieve), and volatilizes the wood acid gas at the time of molding, eliminates the possibility of generation of water vapor or bubbles, and prevents surface roughening. By intention, the water content is within 15 wt%, preferably within 11 wt%, ideally 3 wt%.
-5 wt%.

In order to further improve the characteristics of the wood powder, a material such as a wood chip is immersed in or added to a urea-based resin adhesive, heated and cured, and then crushed into 50 to 300 mesh and pulverized. In the method of molding wood flour, wood acid in wood flour can be neutralized and volatilized by sufficient heat curing, especially by heat curing while neutralizing with a urea resin adhesive. It is quickly removed and a hardened adhesive surface is provided around the wood flour, effectively preventing the water content of the wood flour from being increased, further improving the lubricity of the wood flour, and reducing the frictional resistance during molding extrusion. In particular, it can be reduced.

The thermoplastic resin molding material is obtained by crushing the above-discarded various resin molded products as they are or a resin molded product on which a surface resin coating film is formed into a plurality of small pieces. On the other hand, a resin coating film is ground and peeled by applying a compression grinding action, and a compression impact force based on micro-vibration is applied to each of the ground small pieces to crush and crush, and crush and crush. PVA was removed as needed from the resin coating film removed as a thermoplastic resin molding material
Resins such as C, PET and PP.

In the case of PP, the wood powder is mixed up to 75 wt% at maximum. The range of the mixing ratio of the wood flour is equivalent to 20 to 75 wt%, preferably 30 to 70 wt%.

The mixing capacity is appropriately determined in accordance with the desired properties such as the desired abrasion resistance properties. However, in the present invention, since the various adverse effects at the time of molding are eliminated, the mixing capacity is large. Can be mixed.

In the case of PET, wood flour is mixed up to 60 wt% at maximum, but the mixing ratio of wood flour 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, for example, 5
0% can be added at a time.

It is to be noted that pigments can be added to the product to color it according to the purpose of use.

The cellulosic crushed product having an average particle size of 20 mesh or less with a water content of 15 wt% or less is 20 to 75%.
25% to 80% by weight of a thermoplastic resin molding material with respect to wt% are mixed together by a stirring impact blade, gelled and kneaded by frictional heat, and the gelled kneaded material is air-cooled at room temperature or cooled by appropriate means. When the woody synthetic powder obtained by sizing to a particle size of 10 mm or less is put into the hopper 73 of the extruder 70, the familiarity between the woody powder and the thermoplastic resin molding material is further improved, and A well-kneaded dough that can reduce frictional resistance is formed.

Production Example of Woody Synthetic Powder In FIG. 11, reference numeral 80 denotes a fluid mixing and kneading means for mixing and kneading raw materials, cooling and pulverizing to form "granulated wood flour". It is called "mixer".

Reference numeral 81 denotes a mixer main body, which is a cylindrical casing having an upper surface opening and having a capacity of 300 liters. The opening is an input port 94 for charging raw materials into the mixer main body 81, and this input port 94 is opened and closed. It is covered with a free upper cover 82. A gas discharge pipe 95 for discharging a large amount of water vapor or wood acid gas generated from wood flour in the mixer main body 81 is connected to the upper lid 82. Furthermore, the mixer body 8
One outlet 88 is provided on the outer peripheral surface near the bottom surface of the cylinder 1, and a lid 89 for covering the outlet 88 is provided at the tip of a rod of a cylinder 91.
Is provided so that it can be opened and closed freely. A discharge duct 93 communicates with the discharge port 88.

Further, a shaft 83 which rotates at a high speed of 820 rpm / max at a speed of 820 rpm / max by a rotary driving means of a motor 37 KW (DC) (not shown) is supported on the center of the bottom surface of the mixer main body 81 upward in the mixer main body 81. A scraper 84 and stirring impellers 85, 86, 87 are arranged on the shaft 83 in order from the bottom to the top.
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, the blades are two blades symmetric about the axis 83. When three stirring impellers are stacked as shown in FIG. 1, the blades are composed of a total of six blades.
The blades are equally angled (60
Degrees) and overlap with each other. In the case where a plurality of stirring impellers are provided, it is preferable that the stirring impellers are overlapped with each other at an angle obtained by equally dividing 360 degrees in terms of the total number of stirring impellers in terms of efficiently mixing the raw materials.

The scraper 84 rotates by slightly sliding on the bottom surface of the mixer body 81, and rotates.
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 materials to be introduced from the introduction port 94 with the top lid 82 opened are additives such as wood flour, which is a crushed cellulosic material, a thermoplastic resin molding material, urea, calcium carbonate, titanium oxide, pigment and the like. .

The above-mentioned calcium carbonate brings about good dimensional stability to the hollow resin molded plate of the present invention and contributes to remarkably reduce expansion and shrinkage due to temperature change. And is inexpensive itself.

The titanium oxide has good fluidity and good dispersibility in a solution, and contributes to significantly reducing expansion and contraction of the hollow resin molded plate of the present invention due to temperature change.

The thermoplastic resin molding material is made of semi-rigid or soft vinyl chloride or PVC, PET, P
One kind of resin such as P, PC, PE, PTO or a mixture of several kinds of these can be used.

Similarly, a recycled thermoplastic resin molded material obtained from a waste material of a thermoplastic synthetic resin product is reused, or a virgin thermoplastic resin is charged, or the virgin thermoplastic resin is mixed with the recovered resin. A mixture obtained by mixing thermoplastic resin molding materials at an appropriate mixing ratio can also be used.

The thermoplastic resin molding material may be in the form of pellets, but is preferably a fine powder of 60 mesh or less from the viewpoint of good dispersion.

The granulating means comprises: granulating the wood granules formed by the fluid mixing and kneading means, by air cooling at room temperature or cooling by appropriate means, granulating the granulated wood powder to a grain size of 10 mm or less; Is formed.

In FIG. 12, reference numeral 120 denotes a sizing means for sizing the above-mentioned granulated wood flour. In this embodiment, a "cutter mill" is used.

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 has an input port 123 into which the granulated wood powder is input into the cutter mill main body 121.

Further, a cutter support 124 is provided in the cutter mill main body 121, which is rotatably supported by the bottom surface of the cutter mill main body 121 and is rotated in the horizontal direction by rotation driving means (not shown). Are provided with three long rotating blades 125, and these three rotating blades 125 are provided.
Are disposed so as to form an equal angle of 120 degrees in the rotation direction of the cutter support 124, and the cutting edges of the three rotary blades 125 are located on the same rotation locus. Further, the two fixed blades 126 are fixed to the cutter mill main body 121 at a position substantially symmetrical to the rotation locus of the cutting edge of the rotary blade 125 through a slight gap with respect to the rotation locus of the cutting edge of the three rotary blades 125. Fixed blade 1
The cutter mill main body 121 is divided into two parts by the blade 26, the cutter support 124, and the rotary blade 125.
To form The input port 123 of the lid 122 communicates with the input 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 flour can be sized to a desired size. Further, the sizing chamber 128 is partitioned by the screen 129 so as to surround the rotation locus of the rotary blade 125 between the two fixed blades 126. In addition, sizing room 1
The cutter mill 12 is provided at the lower end of the cutter mill body 121 of FIG.
0, an outlet 131 for discharging the sized product is provided.

Production Example of Woody Synthetic Powder In this example, the main molding materials of the raw materials are wood flour which is a crushed cellulosic material and PP which is a thermoplastic resin molding material.

30 kg of wood powder having an average particle diameter of 20 mesh or less, a true specific gravity of 1.4 and a bulk specific gravity of 0.2 was used for 55 wt% of the raw material.
(At this time, the wood flour contains about 4 wt% of water) and 0.6 kg of a 40% aqueous solution of urea such as ammonia, phenol, melamine, etc., which serves as a neutralizer of wood acid gas (the ratio of urea to wood flour is 1 wt%) and 6 kg of calcium carbonate, and 45 wt% of the raw material is 27 kg of a thermoplastic resin molding material PP (polypropylene).

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

The step of kneading with the mixer 80 as the above-mentioned fluid mixing and kneading means will be described in detail below.

(1) The stirring impellers 85, 86, 87 and the scraper 84 are rotated at a high speed, the upper lid 82 is opened, 30 kg of wood flour is introduced from the introduction port 94, and 0.6 kg of the urea is added little by little.

(2) After about 1 minute, 6 kg of 5 to 10 wt% calcium carbonate is added and kneaded for about 10 to 20 minutes. When calcium carbonate is added, the specific gravity of the raw material increases, so the shearing force of the high-speed rotating stirring impeller increases, so that the generation of frictional heat due to the shearing force is improved, and the temperature in the mixer 80 becomes 180 to 190 ° C. Thus, the water content of the raw material is reduced to preferably 0.3% by weight or less. The wood flour is crushed by the high-speed rotation of the stirring impact blades 85, 86, 87. At this time, a large amount of water vapor or wood acid gas generated from the wood flour is discharged from a gas discharge pipe 95 provided on the upper lid 82.

(3) Next, the PP of the thermoplastic resin molding material
(Polypropylene) 27 kg is put into the mixer body 81 and kneaded for 5 to 8 minutes (in this embodiment, kneaded for about 8 minutes). In this embodiment, as the form of the thermoplastic resin molding material, pellets having a size of about 3 mm in diameter are used.

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, the PP is not formed into a large lump due to the wood powder in the raw material, and is gelled into a clay state without agglomeration during mixing and dispersion. In this step, the above-mentioned clay-like gel was turned into a massive kneaded material having a diameter of about 10 to 100 mm.

(4) When the motor is operated at a low speed to lower the temperature to about 10 ° C. higher than the melting point of the thermoplastic resin molding material in the raw material, the gelled and kneaded material in the mixer 80 is cooled and is stirred by the stirring impeller. It is crushed and granulated into a lump having a diameter of about 25 mm or less.

[0095] This granulated mass is formed in a state where each wood flour has a thermoplastic resin adhered to the entire surface of the wood flour alone.

(5) The cylinder 91 is operated to retract the lid 89 to open the discharge port 88. The raw material gelled and granulated in the mixer body 81 is discharged from an outlet 88 to a discharge duct 93.
After that, it is discharged to the next process. The entire process from input of raw materials to discharge was performed in 27 minutes and 54 seconds.

Next, in the cutter mill 120,
When the above-mentioned granulated wood powder is supplied from the input port 123 of the lid 122 and the cutter support 124 is rotated by a rotation driving means (not shown), the granulated wood powder is rotated by the rotating blade 12 of the cutter support 124.
5 and the fixed blade 126 are ground to a predetermined particle size of 10 mm or less to form “woody synthetic powder”, and a so-called thermoplastic resin molding material is fixed to thermally and chemically stable wood powder particles. In order to constantly maintain the mixing and dispersion of the wood powder and the thermoplastic resin molding material so that the wood powder and the thermoplastic resin molding material can be constantly maintained, a woody synthetic powder giving good fluidity is formed, and condensation by cooling, Combined with the shrinking action, a woody synthetic powder not formed by chemical reaction or adhesion is formed, passes through the mesh of the screen 129 of the sizing room 128, is discharged from the discharge port 131, and is sent to the extruder 70 in the next step.

Operation in the Forming Die A rectangular injection port having a height equal to or less than the height of the molding chamber of the molding section of the extruder 70 of the extruder 70 is formed and gradually narrowed toward the injection port. Extruded dough 79 discharged in large quantities from the extrusion die 19 formed so as to change in cross section,
At the same time as flowing in the width direction of the molding die 10 along the introduction chamber 13 through the introduction section 11, it flows in the extrusion direction inside the molding chamber 22, and as shown by arrows in FIGS.
Flows around the extrusion die 19 in such a direction as to expand the ring.

Since the widths of the introduction section 11 and the introduction chamber 13 are suddenly widened, the extruded dough 79 flowing in the introduction section 11 and the introduction chamber 13 is heated by the heater 14 in the melting section 21a to maintain a good kneading state. While being extruded. The extruded dough 79 is extruded into the elongated rectangular forming chamber 22, and is cooled and solidified by cooling water flowing through the cooling pipe 25 in the process of passing through the cooling section 21 b in the forming chamber 22, and is solidified to 13 mm. A hollow resin molded plate 29 as a thick product is molded.

The core body 40 is supported in a cantilever manner with respect to the guide portion 15. However, in the forming die, a so-called semi-molten portion between the melting portion 21a and the slow cooling portion 21b is formed, and the slow cooling portion is formed. The die outlet 23 side is supported by the extruded dough itself that has been gradually cooled and solidified, and thus the core body is not deformed by the extruded dough.

The core body has a tapered shape in the thickness and width from the molding guide part 41 in the direction of the die outlet 23, so that the core body is resistant to the extrusion force when the extruded material is cooled and solidified. Never be.

More specifically, the flow of the extruded fabric 79 discharged from the extrusion die 19 hits the rear end face of the base 44 of the guide 15 as shown by arrows in FIGS. 44 through the flow path formed between the rear edge of the introduction chamber 13 and the rear wall surface of the introduction chamber 13, and proceeds to both sides in the width direction of the introduction chamber 13.
Of the molten portion 41 through the gap between the lower surface of each core member 40 and the lower wall surface of the molding chamber 22 and the upper wall surface of the introduction chamber 13 while flowing from the inclined portion 43 to the space between the core members 40. Body 40
In the direction of the upper wall surface of the melting portion 41 and the upper surface of the melting portion 41. Therefore, the flow of the extruded dough becomes an average flow in the molding chamber 22, and depending on the raw material, the extruded dough 79 undergoes different linear expansions in the extruding direction between the central portion and the end portion, so that the molecular orientation is different. By controlling the molecular orientation by homogenizing the linear expansion and controlling the molecular orientation, it is uniformly diffused into the molding chamber 22, extruded at a uniform density, and uniformly diffused into the molding chamber 22 in the molding die 11a. Extruded at a uniform density.

If a sheet of fluororesin is attached to the surfaces of the guide portion 15 and the core 40, the resistance to the extruded material 79 passing through the surface of the guide portion 15 is small. Since the large amount of wood powder flows smoothly without receiving a large resistance on the surface of the guide portion 15, the extruded dough 79 is extruded into the molding chamber 22 of the molding die while maintaining a uniform and high-density kneading state.

In particular, when the extrusion molding of the present invention is carried out using the woody synthetic powder, the extruded dough 79 in a well-kneaded state in which the resin has uniformly penetrated into the individual wood flours in the extruder 70.
Is formed, especially the wood flour in the extruded dough flows smoothly without receiving a large resistance on the walls of the extruder and the inside of the forming die, and a more uniform and high-density hollow resin molded plate is formed. .

In the process in which the extruded fabric 79 flows through the molding chamber 22, the sheets 24 made of fluororesin are stuck on the inner walls of the molding chamber 22 at the upper, lower, left and right sides. It is extruded smoothly while being slowly cooled.

The fluororesin has a heat resistance of about 300 ° C., a smooth surface, a small coefficient of friction, and a low coefficient of thermal conductivity as compared with metal. The following operations are performed.

Since the fluororesin has a smooth surface and a small coefficient of friction, the wood flour in the extruded dough 79 passing through the molding chamber 22 flows without receiving a large resistance. Therefore, the kneading state of the extruded dough 79 is maintained in a good state, and as a result, a high-quality hollow resin molded plate having a uniform density, no nests, and a smooth surface is produced.

In the slow cooling section 21b of the molding chamber 22, the extruded dough 79 is cooled, so that the fluidity of the extruded dough 79 is deteriorated, and the wood powder in the extruded dough 79 has a higher frictional resistance than the resin. The inner wall surface also has a large frictional resistance, and the wood flour flowing in contact with the inner wall surface of the forming die receives a large resistance and does not flow smoothly, so that the kneaded state of the extruded dough 79 is made coarse and dense to form a nest. Although this had an adverse effect, by providing the fluororesin sheet 24 on the inner wall surface of the molding chamber 22, the wood powder of the extruded dough 79 flows smoothly without receiving a large resistance from the inner wall surface of the molding chamber 22. Therefore, the extruded dough 79 is extruded in the molding chamber 22 in a well-kneaded state with uniform and high density without adversely affecting the extruded dough 79 as described above.

Further, as described above, the resistance to the wood powder of the extruded dough 79 is reduced, and the extruded dough 79 is formed with a uniform density.
The surface of No. 9 is finished to a smooth surface without so-called rough skin.

Conventionally, the wood flour of the extruded dough 79 does not flow smoothly in the forming die, so that the wood flour is burned by the heat of the heater of the forming die and changes to a dark brown color. Since the wood flour of the extruded dough 79 flows smoothly, the wood flour does not burn and the quality characteristics such as impact resistance do not decrease.

Since the fluororesin has a lower heat conduction coefficient than metal, it has a slow cooling effect and acts to suppress the distortion of the extruded fabric 79 during cooling.

The slow cooling section 21 in the forming chamber 22 of the forming die 10
b is cooled by cooling water flowing through the cooling pipe 25,
Since the fluororesin has a lower heat conduction coefficient than metal, the cooling temperature of the molding chamber 22 is not directly and rapidly conducted to the inner wall surface of the molding chamber 22.
Is not rapidly cooled but is gradually cooled. Therefore, the occurrence of large distortion that occurs when the extruded fabric 79 is rapidly cooled is prevented, and the distortion of the hollow resin molded plate 29 as a product is reduced, and at the same time, the surface becomes smooth.

Thereafter, the hollow resin molded plate 29 as the product is cut into a desired length by a cutting machine such as a cutter, a shearing machine or a sawing machine. A cutting machine such as a cutter is used for a thin hollow resin molded plate 29, and a cutting machine such as a shearing machine or a sawing machine is used for a thick hollow resin molded plate 29 of 12mm or the like.

The hollow resin molded plate 29 of W: 550 mm, H: 13 mm, which is 100% of PP as the above product, has a rectangular hollow portion of W: 35 mm, H: 5 mm in the center cross section.
Seven hollow resin molded plates formed at intervals of mm and having this hollow portion are cut by a sawing machine every 1820 mm, and the weight is 9.7.
A substantially beige hollow resin molded plate having a light weight of almost the entire kg was obtained.

55 × 1.3 × 182 × 0.9 ≒ 11.7 kg 11.7− (3.5 × 0.5 × 182 × 0.9) ≒ 9.7 kg By the way, PP of the thermoplastic resin molding material was used. The specific gravity of the resin molded plate molded at 100% is about 0.9, and the resin molded plate W: 5
50mm, H: 12mm, L: 1820mm weigh 11.7
kg.

55 × 1.3 × 182 × 0.9 ≒ 11.7 kg

[0117]

[Table 1]

A hollow resin molded plate 29 having a rectangular cross section of W: 35 mm, H: 5 mm formed at intervals of 20 mm at the center cross section and having a width of 20 mm is used. To obtain a 12.1 kg beige hollow resin molded plate used as a material for interior and exterior of automobiles. The hollow resin molded plate having a thickness of about 10 to 12 mm is used for other purposes such as desks, tables, cupboards, building materials, and furniture materials.

Ρ = 1.4 × 0.93 / (0.49 × 1.4) + (0.51 × 0.93) = 1.4 × 0.93 / 1.1603 ≒ 1.12 55 × 1.3 × 182 × 1.12 ≒ 14.6 kg (3.5 × 0.5 × 182 × 1.12) × 7 ≒ 2.5 kg 14.6-2.5 = 12.1 kg The forming die 10 By setting the height to 20 to 30 mm, a hollow resin molded plate having a thickness of 20 to 30 mm is formed, and this hollow resin molded plate is used as a cutting board or a plate material for other uses. Therefore, the thickness of the molded hollow resin plate is not limited to the above-described embodiment.

[0120]

[Table 2]

Hollow resin molded plate W: 910 mm, H: 13 is a molded plate 29 as a product in which seven rectangular hollow portions of W: 35 mm, H; 5 mm are formed at an interval of 20 mm in the center cross section.
mm by shearing every 1820mm, weight 1
A hollow resin molded plate of 4.1 kg is obtained.

Ρ = 1.4 × 1.25 / (0.45 × 1.25) + (0.55 × 1.4) = 1.25 × 1.4 / 1.3325 ≒ 1.31 55 × 1.3 × 182 × 1.31 ≒ 17.0 kg (3.5 × 0.5 × 182 × 1.31) × 7 ≒ 2.9 kg 17.0-2.9 = 14.1 kg This hollow resin molded plate It is also a material for a wide range of uses, such as various building materials, furniture materials, and equipment parts. For example, used as building materials for houses, or about 300
Processed to a size of mm square, it is used as flooring material such as flooring blocks. Further, as another application, it is used as an interior material in a car, for example, as a fan plate, and can provide a sense of quality.

[0123]

[Table 3]

The center section of the above product is W: 35 m
m, H; hollow resin molded plate in which 7 rectangular hollow portions of 5 mm are formed at intervals of 20 mm W: 550 mm, H: 13 mm cut by a sawing machine every 1820 mm, and a beige hollow resin weighing 12.1 kg A molded plate was obtained.

Ρ = 1.4 × 0.9 / (0.45 × 1.4) + (0.55 × 0.9) = 1.4 × 0.9 / 1.125 ≒ 1.12 (wood 55 × 1.3 × 182 × 1.12 ≒ 14.6 kg (3.5 × 0.5 × 182 × 1.12) × 7 ≒ 2.5 kg 14.6-2.5 = 12 Accordingly, the extrusion molding method of the present invention can form a hollow resin molded plate having a wide range of thickness from a thin plate to a thick plate,
Materials are molded for a wide range of uses.

Since the hollow resin molded plate molded by the extrusion molding method of the present invention has a high density, a large amount of wood flour can be mixed therein. A hollow resin molded plate is formed. Also.
The hollow resin molded plate into which a large amount of wood powder is mixed has properties close to that of natural wood.

[0127]

The raw material is heated and kneaded, and is discharged from the extrusion die with a screw through the introduction portion of the molding die to the molding die, and is parallel to the extrusion direction from the guide portion provided at the introduction portion of the molding die. The extruded dough extruded through a core body extending to at least the slow cooling portion of the molding chamber through the melting portion is formed into a predetermined thickness while forming a predetermined thickness, and the extruded dough extruded into a forming die is formed. Slowly cooling in the slow cooling section, and including at least a step of increasing the density of the extruded dough by adding a suppressing force against the extruding force to this extruded dough, can provide a lightweight hollow resin molded plate by extrusion molding, Moreover, since an extruding dough is provided with a suppressing force against the extruding force, generation of bubbles, nests, and the like can be prevented, and a uniform, high-density, lightweight hollow resin molded plate can be provided.

Since the extruded material of the extrusion molding was extruded by extruding into a molding part of a molding die having a fluororesin sheet adhered to the inner surface or coated with the fluororesin, the raw material in the extruded material was not subjected to a large resistance. Since it extruded while flowing smoothly and maintaining a uniform and high-density kneading state, a uniform, high-density and lightweight hollow resin molded plate could be provided.

Further, since the fluororesin has a low thermal conductivity, it has a slow cooling effect, and as a result, the distortion generated when the extruded fabric is cooled can be reduced. Therefore,
A high quality hollow resin molded plate with little internal residual stress that does not require correction such as correcting distortion of the formed plate with a correction roll or the like was able to be formed.

Since the fluororesin has a small friction coefficient, the resistance of the extruded dough to the cellulose crushed material can be reduced, and the kneaded state of the cellulose crushed material and the thermoplastic resin molding material flows in a good state. Therefore, a wide, uniform, high-density hollow resin molded plate of high quality could be directly formed by extruding from a molding die in a good kneaded state. For this reason, a thick hollow resin molded plate is directly
It could be extruded.

Further, since the flow of the cellulosic crushed material is good, the flow of the cellulosic crushed material is slowed down unlike the prior art, so that the cellulosic crushed material is not burned by the heat of the heater of the forming die. Therefore, the molded hollow resin molded plate did not discolor to dark brown, and it was possible to prevent deterioration in quality characteristics such as impact resistance as in the prior art.

Since the fluororesin has a small coefficient of friction, the kneaded state of the cellulosic crushed material and the thermoplastic resin molding material flows in a good state, so that the surface of the hollow resin molding plate, which is a molding plate as a product, is roughened. A hollow resin molded plate having a smooth surface was able to be formed without occurrence of.

The guide portion has a total length of 70 to 95% of the total length of the forming die in the width direction and is provided at a height of 70% or less of the height of the guide portion. By this guide portion, the extruded dough prevents the central portion and the end portion from undergoing different linear expansions in the extrusion direction and different molecular orientations,
By homogenizing the linear expansion and controlling the molecular orientation, it is uniformly diffused into the molding chamber and extruded at a uniform density.

The core body has a substantially comb-like shape as a whole, and has a molding guide part which is slightly more than halfway from the guide plate formed in a rod-like member having a rectangular cross section provided integrally with the guide part toward the tip. The guide for the core is formed such that both side edges of the core are tapered at a taper of 1/1000 from the forming guide, and the core is extruded when the extruded material is cooled and solidified. In addition, the extruded dough is smoothly extruded without any resistance to the air, and the extruded dough is not cooled, and the hollow surface does not have a depression due to the cooling.

Extrusion into the molding die 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 changes its cross section toward this injection port. Since it is performed by the die formed as described above, a large amount of extruded dough was discharged, and the clogging of the die could be prevented.

The woody synthetic powder has good compatibility between the crushed cellulosic material and the thermoplastic resin molding material, and the thermoplastic resin molding material adheres to the entire surface of the crushed cellulose material and is thermally and scientifically stable. A woody synthetic powder dispersed so as to constantly maintain the state of being fixed to the wood flour particles is formed, which reduces the frictional resistance of the crushed cellulosic material in the extruded dough during extrusion. Kneaded in a state where the cellulose crushed material and the thermoplastic resin molding material are well dispersed,
Since it was extruded while maintaining a good kneading state, a uniform, high-density, lightweight, lightweight wooden composite board could be formed.

The extruded extruded dough is extruded by extruding it into the molding portion of a forming die having a fluororesin sheet adhered to the inner surface or coated with a fluororesin, so that the cellulosic crushed material in the extruded dough has a large resistance. Since it flows smoothly without being received and is extruded while maintaining a uniform and high-density kneading state, a uniform, high-density and lightweight lightweight wooden composite board can be provided.

[0138] Since the integral core is provided in the guide portion, the extruded dough is evenly diffused into the molding chamber by the guide portion.
Depending on the raw material, the extruded dough 79 does not have different linear expansions at the center and ends in the extrusion direction to prevent different molecular orientations, to achieve uniform linear expansion, control molecular orientations, and form It was evenly diffused into the chamber 22 and could be extruded at a uniform density.

[0139] By the extrusion molding method of the hollow resin molded plate of the present invention, various building materials such as a concrete panel, a floor material (flooring block) of a house, a decorative panel of a wall surface in a room, etc.
Alternatively, materials for a wide range of uses, such as furniture materials and interior and exterior materials for various vehicles, could be provided.

Since the high-density hollow resin molded plate can be molded by the extrusion molding method of the present invention, a large amount of wood powder per unit weight can be mixed. Molded.

[0141]

[Brief description of the drawings]

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

FIG. 2 is a partial plan view of a forming die according to an embodiment of the present invention.

FIG. 3 is a central longitudinal sectional view of a forming die according to an embodiment of the present invention.

FIG. 4 is a perspective view of a forming die according to the embodiment of the present invention.

FIG. 5 is a plan view showing a cross section of a main part of the forming die according to the embodiment of the present invention.

FIG. 6 is a vertical sectional view of a main part of a forming die according to an embodiment of the present invention.

FIG. 7 is a plan view showing a cross section of a main part of the brake means according to the embodiment of the present invention.

8 is a vertical sectional view taken along line NN of FIG. 7;

FIG. 9 is a vertical sectional view taken along line JJ of FIG. 1;

10 is a vertical sectional view taken along the line KK in FIG. 1;

FIG. 11 is an overall front view showing a cross section of a main part of a mixer (fluid mixing / kneading means) used in an example of the present invention.

FIG. 12 is an overall front view showing a cross section of a main part of a cutter mill (granulating means) used in an example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Forming die 11 Introducing part 13 Introducing chamber 14 Heater 15 Guide plate 16 Screen part 17 Adapter 18 Inlet 19 Extrusion die 21a Melting part 21b Slow cooling part 22 Forming chamber 23 Die outlet 24 Sheet (of fluororesin) 25 Cooling pipe 27 Pin 28 Fixture 29 Forming Plate 30 Brake Means 31 Pinch Roller 31a Fixed Pinch Roller 31b Free Pinch Roller 34a, 34b Bearing 36 Bearing Fixing Frame 40 Core 41 Forming Guide 42 Extraction Guide 43 Slope 44 Base 70 Extruder 71 Screw 72 Gear reducer 73 Hopper 74 Barrel 75 Band heater 76 Screen 78 Extrusion die 79 Extruded dough 80 Mixer (flow mixing and kneading means) 81 Mixer body 82 Top lid 83 Shaft 84 Scraper 85, 86, 87 Stirrer impact blade 8 8 Discharge Port 89 Lid 91 Cylinder 92 Tightening Nut 93 Discharge Duct 94 Input Port 95 Gas Discharge Tube 120 Cutter Mill (Granularizing Means) 121 Cutter Mill Body 122 Lid 123 Input Port 124 Cutter Support 125 Rotary Blade 126 Fixed Blade 127 Input Chamber 128 Sizing room 129 Screen 131 Outlet

Continuation of the front page (51) Int.Cl. ⁶ identification code FI B29L 7:00 22:00 (58) Field surveyed (Int.Cl. ⁶ , DB name) B29C 47/00-47/96

Claims (13)

(57) [Claims] 1. A raw material is heated and kneaded, is discharged from an extrusion die with a screw through an introduction portion of the molding die to a molding die, and is parallel to an extrusion direction from a guide portion provided at the introduction portion of the molding die. The extruded dough extruded through a core body extending to at least the slow cooling portion of the molding chamber through the melting portion is formed into a predetermined thickness while forming a predetermined thickness, and the extruded dough extruded into a forming die is formed. A method for extrusion molding a hollow resin molded plate, comprising at least a step of gradually cooling the extruded dough and increasing a density of the extruded dough by applying a suppressing force against the extruding force to the extruded dough. 2. A raw material is heated and kneaded, and a screw is discharged from an extrusion die to a forming die having a fluororesin sheet adhered to an inner wall surface or coated with a fluororesin through an introduction portion of the forming die. A core body that rises from a guide portion provided in a guide portion provided in a width direction of the guide portion at a guide portion of the forming die, protrudes in parallel with the extrusion direction, and extends at least to a slow cooling portion of the forming chamber via a melting portion. The extruded dough extruded through is formed into a predetermined thickness while forming a hollow portion, the extruded dough extruded into a forming die is gradually cooled in the slow cooling section, and the extruded dough resists the extruding force. A method for extruding a hollow resin molded plate, comprising at least a step of increasing the density of an extruded dough by applying a suppressing force. 3. A cellulosic crushed product having an average particle size of 20 mesh or less with a water content of 15 wt% or less, 20 to 75 wt%.
25 to 80 wt% of thermoplastic resin molding material are mixed together by a stirring impact blade, and gelled and kneaded by frictional heat.
3. The method for extrusion molding a hollow resin molded plate according to claim 1 or 2, wherein the synthetic resin powder is cooled, pulverized and sized to a particle size of 10 mm or less, and extruded into a molding die. 4. The extrusion molding method for a hollow resin molded plate according to claim 1, wherein the extruded material is heated at an introduction portion of the molding die and extruded into the molding die. 5. An extruder for heating and kneading a raw material, extruding with a screw, an extruder for heating the extruded dough discharged from the extruder die, and an extruded dough extruded from the introducer. A molding die having a molding section comprising a melting section and an annealing section for molding to a predetermined thickness is connected, a fluororesin sheet is adhered to the inner wall surface of the molding chamber, or a fluororesin is coated, and A cooling means for cooling the slow cooling portion is provided on the forming die, and a guide portion provided at an introduction portion of the forming die rises from the guide portion, and projects in parallel with the extrusion direction through the melting portion, and at least the A hollow resin molded plate provided with a core extending in a slow cooling portion of a molding chamber, and brake means for applying a suppressing force against a pushing force of the molded plate extruded from the molding die; Extrusion molding apparatus. 6. The guide portion has a total length of 70 to 95% of a total length in a width direction of the introduction portion at an introduction portion of the forming die,
6. The apparatus for extruding a hollow resin molded plate according to claim 5, wherein said apparatus is provided at a height of 70% or less of the height of said introduction portion. 7. The core body has a substantially comb-like shape as a whole,
7. The extrusion of a hollow resin molded plate according to claim 5, wherein the guide plate comprises a guide plate formed into a rod-shaped member having a rectangular cross section provided integrally with the guide portion, and a molding guide portion slightly more than half toward the tip and the remaining pull-out guide portion. Molding equipment. 8. The molding guide portion of the core according to claim 5, wherein the molding guide portion of the core body has a thickness equal to or less than 45% of the height of the molding die and has the same thickness at the center of the molding die. Extrusion molding equipment for hollow resin molded plates. 9. The apparatus for extruding a hollow resin molded plate according to claim 5, wherein a plurality of the cores are arranged in parallel at intervals of 4/7 of the width of the cores. . 10. The hollow resin molded plate according to claim 5, wherein the extraction guide portion of the core body is formed such that both side edges of the plane from the molding guide portion are tapered with a taper of 1/1000. Extrusion equipment. 11. The brake means includes a plurality of pairs of upper and lower pinch rollers for holding and pressing the front and back surfaces of a formed plate, and connecting the shaft end of one pinch roller to an input shaft of a powder brake, 6. The apparatus for extruding a hollow resin molded plate according to claim 5, wherein gears provided at shaft ends of the pinch rollers are meshed. 12. The introduction part is curved in the width direction of the molding die, and both ends are formed in a coat hanger type extending to both ends in the longitudinal direction of the molding chamber entrance, and between the introduction part and the entrance of the molding chamber, the molding chamber is formed. 6. The extrusion molding apparatus for a hollow resin molded plate according to claim 5, further comprising an introduction chamber having a triangular cross section in a direction in which a vertical cross section gradually narrows toward. 13. The extrusion die of the extruder has a rectangular injection port having a height equal to or less than the height of a molding chamber of the molding die, and is formed so as to gradually change its cross section toward the injection port. An apparatus for extruding a hollow resin molded plate according to claim 5.