JPH11254408A - Manufacture of product composed of woody piece and resin kneaded together and its system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing efficiently a product composed of woody pieces and resin having no restrictions for the shape and the like kneaded together and also provide a system thereof. SOLUTION: A kneaded product manufacturing system 10 is formed of the combination of a wood crushing device 12 including a crusher 24 for forming fine woody pieces by accelerating the movement of woods by air flow and making the pieces collide with one another and a pellet manufacturing device 14 for forming very fine resin pellets containing thermoplastic resin at the 45% weight ratio or more from waste plastic, and fine woody pieces and resin pellets are kneaded together and pressurized while pressuring by a kneader 16 to manufacture a kneaded product of what is called wood plastic.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and system for producing a kneaded product of wood pieces and resin, and more particularly to a method of producing a kneaded product called wood plastic by kneading waste wood and resin. And systems.

[0002]

2. Description of the Related Art Conventionally, waste materials resulting from the dismantling of wooden houses are mainly used as fuel for processing.
Further, a part of the waste plastic is used as a recycled resin, but most of the waste plastic is incinerated or landfilled.

[0003] The amount of such construction waste materials and waste plastics is enormous, and there has been a demand for a technology for recycling these materials without incineration or landfill.

[0004] In addition, a large amount of fiber waste such as paper and clothing in general waste is generated, and it is desired to recycle the waste by a method other than incineration.

In contrast to the above, for example, Japanese Patent Publication No. 7-5842
It is conceivable to use a method for producing a kneaded product of wood flake pieces and resin as disclosed in Japanese Patent Application Laid-Open Publication No. H11-209,878.

[0006]

SUMMARY OF THE INVENTION The above Japanese Patent Publication No. 7-584.
Wood flake pieces as a raw material used in the method disclosed in Japanese Patent Publication No. 2 are limited to, for example, wood formed to a required thickness by passing wood through a planer board. However, there is a problem that the processing cost increases.

In addition, papers,
Although it is conceivable to mix fibers, they have a problem in that they have low strength and are not used for products kneaded with resin.

Further, there is a problem that the resin used is limited to a thermoplastic resin, a non-thermoplastic resin cannot be treated, and separation must be performed in advance, thereby increasing the cost.

In the method of Japanese Patent Publication No. 7-5842, when a large amount of water is absorbed or adhered to a piece of wood flakes, this is kneaded and compressed together with a resin, and the water is converted into water vapor. There is a problem in that the processing time in the pressure kneader for diverging is long and the efficiency is reduced.

The present invention has been made in view of the above-mentioned conventional problems, and it is not necessary to process a wood piece, which is a raw material, into a flake piece, and the kneading time is short, so that efficient processing is possible. Provided is a method and system for producing a kneaded product of wood pieces and resin, which is capable of mixing and processing waste resin in which a plurality of types of resins are mixed, and low-strength waste such as papers and fibers. The purpose is to do.

[0011]

According to the present invention, there is provided a method comprising:
Crushing the wood pieces into wood strips, as described, by accelerating the wood pieces by an air flow and causing them to collide with each other;
Manufacturing a fine resin pellet containing at least 45% by weight of a thermoplastic resin, a mixing step of mixing the wood strip and the resin pellet, and heating the wood strip and the resin pellet after the mixing step. While being kneaded in the kneader below, the water is transferred forward while the water contained in the woody pieces is vaporized by the heating in the kneader, and the vapor is released from the kneader to the outside and vaporized. The kneaded product of the wood flakes and the thermoplastic resin, the moisture content of which has been substantially removed, is further kneaded while being pressurized, and is poured into a mold having a required shape in a fluid state to obtain a desired kneaded product. The object is achieved by a method for producing a kneaded product of a wood piece and a resin.

According to a second aspect of the present invention, in the first aspect, the resin pellets are formed from a waste resin mixed with a non-thermoplastic resin as a raw material. The above object is achieved by a method for producing a kneaded product with the above.

The resin pellets are 0 to 40% by weight.
May be included.

According to a fourth aspect of the present invention, in the first, second or third aspect, the resin pellets have a diameter of 3 mm or less. The above object is achieved by a manufacturing method.

According to a fifth aspect of the present invention, there is provided a wood crushing apparatus which accelerates wood pieces by an air flow and crushes the wood pieces by causing them to collide with each other to produce wood thin pieces; And a weighing device for weighing the wood chips and the resin pellets in a predetermined ratio, and a weighing device. A mixer for uniformly mixing the wood pieces and the resin pellets, a kneader for heating and kneading a mixture of the wood chips and the resin pellets mixed by the mixer, and a kneader having a required shape. And a compression molding machine that drives the mixture injected from the injection port of the kneader into the mold to obtain a desired kneaded product, wherein the kneader is a first-stage kneader and a subsequent kneader. Second stage blend And a steam release means provided between them and for releasing steam generated from wood chips in the mixture to the outside by heating, wherein the first-stage kneader is charged with the mixture. A cylindrical kneading cylinder provided with a charging port, an extrusion port provided on the side opposite to the charging port of the kneading cylinder, and the mixture kneaded from the charging port arranged axially in the kneading cylinder. And a heating device provided in the kneading cylinder and heating the mixture kneaded by the screw, and the second-stage kneader is provided with the de-steamed flow. A cylindrical pressure kneading cylinder having an inflow port into which the mixture in the state is introduced, an injection hole provided on the opposite side of the pressure kneading cylinder from the inflow port, and disposed axially in the pressure kneading cylinder From the inlet. While pressurizing and kneading the mixture obtained, a pressure screw for transferring toward the injection hole, provided in the pressure kneading cylinder, having a heating device for heating the mixture kneaded by the pressure screw The above object is achieved by a production system for a kneaded product of a wood piece and a resin.

The wood crushing apparatus comprises a coarse crusher, a medium crusher and a fine crusher which sequentially crush small pieces of wood in this order, and the crusher comprises a wood piece crushed by the medium crusher. May be further finely crushed by being accelerated by an air flow and collided with each other.

[0017] Further, a crushed wood piece conveying means for conveying the wood flakes finely crushed by the crusher to the weighing device by a part of the air flow may be provided.

Furthermore, a scrubber for separating wood chips from air and wood powder containing water separated from the wood chips by collision of the wood chips in the crusher is disposed at the end of the above-mentioned means for conveying the wood chips. May be.

In the present invention, when wood is crushed into small pieces, the wood pieces are accelerated by the air flow and collide with each other, so that the collision energy causes water to evaporate from the wood pieces, and this is quickly caused by the air flow. In the pre-kneading process with resin, the wood chips can be dried to a considerable extent, the processing time in the kneading process can be shortened, and the processing efficiency can be improved. There are no restrictions on the shape and the like.

Further, by making the resin to be kneaded with the wood chips into a reduced pellet form, even if non-thermoplastic resin is mixed, the resin can be processed. Is found not to be significantly reduced, so that paper waste and the like can be treated.

[0021]

Embodiments of the present invention will be described below in detail with reference to the drawings.

As shown in FIG. 1, a kneaded product manufacturing system 10 according to an embodiment of the present invention manufactures a kneaded product of a desired shape from wood such as construction waste and resin such as waste plastic. The wood crushing device 12
And a pellet manufacturing apparatus 14 for forming resin pellets,
A kneader 16 that kneads and compresses the wood chips and resin pellets formed therein to form a molten state by heating, and a mixture of the wood chips and resin kneaded and melted by the kneader 16 in a mold. And a compression molding machine 18 which is driven into a desired kneaded product.

The wood crushing device 12 comprises a coarse crusher 20, a medium crusher 22, and a fine crusher 24, which sequentially crush small pieces of wood.
Are arranged in this order.

The crusher 24 crushes the wood pieces crushed by the middle crusher 22 as shown in FIG.
Are accelerated by an air flow formed through the nozzle 24B, and are further crushed by collision with each other to form wood fragments.

In FIG. 1, reference numeral 26 denotes a medium crushed piece hopper for temporarily storing the wood pieces crushed by the medium crusher 22, and 28 denotes a medium disposed between the outlet of the medium crushed hopper 26 and the input port of the fine crusher 24. 1 shows a first metal sorter.

The metal sorter 28 mainly sorts and removes iron such as nails contained in construction waste material by magnetic force.

Between the crusher 24 and the kneader 16, scrubbers 30A and 30B and crusher hoppers 32A and 32 are provided.
B, a weighing machine 34, and a mixer 36 are arranged in this order from the crusher 24 side.

The scrubbers 30A and 30B and the crushed piece hoppers 32A and 32B are arranged in parallel with each other.
From 4, the wood strips sent out through the transport pipe 38 are alternately fed by a switching operation of a switching valve 39 provided in the middle of the transport pipe 38.

The scrubbers 30A and 30B separate centrifugal force into air containing fine powder and wood chips. The separated wood chips are connected to the lower part thereof via on-off valves 31A and 31B. The crushed piece hopper 32 flows down and is stored.

Here, in the crusher 24, the wood pieces are made into wood pieces by being accelerated and collided by an air flow, and the wood pieces are passed through the transport pipe 38 by a part of the air flow. It is conveyed and sent into the scrubber 30A or 30B via the switching valve 39.

The air containing the fine powder separated from the crushed wood pieces in the scrubber 30 is discharged to the atmosphere by a pump 42 after the fine powder is removed by a filter 40.

The pellet producing apparatus 14 includes a weighing machine 44
A and 44B, the cut paper waste and the waste plastic containing a thermoplastic resin are heated and kneaded by a pressure kneader 46 to be in a molten state, and then passed through a pelletizer 48 and a cooler 49 to have a diameter of approximately It forms a 3 mm resin pellet.

The resin pellets are placed in the crushed piece hopper 32.
A and 32B are temporarily stored in a pellet hopper 50 disposed adjacent to the A and 32B.

The weighing machine 34 comprises a crushed piece hopper 32A,
A predetermined amount of the wood chips is weighed from 32B and mixed with a mixer 36.
And the resin pellets in the pellet hopper 50 are similarly weighed in a required amount and supplied to the mixer 36.

The mixer 36 stirs the wood chips and the resin pellets to mix them uniformly, and supplies the mixture to the inlet 54A of the kneader 16 via the air feeder 52.

Next, details of the kneader 16 will be described with reference to FIGS.
This will be described with reference to FIG.

The kneader 16 comprises a first-stage kneader 17A, a second-stage kneader 17B, and steam removing means therebetween.

The first-stage kneader 17A is horizontally arranged, and has a pair of horizontal cylindrical kneaders having an input port 54A on the upper side of the base end (right end in FIG. 3) and an extrusion port 54B on the opposite end. A cylinder 54 and a screw 56 which is disposed in the kneading cylinder 54 in the axial direction, and which kneads a mixture of wood chips and resin pellets introduced from the introduction port 54A and transfers the mixture toward the extrusion port 54B. , Is configured.

Reference numeral 58 in FIGS. 3 and 4 denotes a motor for driving the screw 56. The kneading cylinder 5
4, the screw 56 and the motor 58 are provided as a pair, respectively, as shown in FIG.
From which a mixture in a fluid state can be extruded alternately.

The pair of extrusion ports 54B are connected to a vertical supply pipe 60 constituting the vapor removing means, so that a fluid mixture can be supplied thereto.

An electric heating device (not shown) is provided on the outer periphery of the kneading cylinder 54, and the kneading cylinder 5 is
The mixture moving inside 4 can be heated to the melting temperature of the resin.

Water vapor is generated from the wood fragments in the mixture heated and kneaded in the kneading cylinder 54 by heating. When the mixture in the fluid state is pushed out to the supply pipe 60, the water vapor is released from the opening 60A at the upper end thereof.

At the lower end of the supply pipe 60, a second kneader 17B is provided horizontally. This second
The kneading machine 17B is provided with a horizontal pressure kneading cylinder 62A having an inflow port 60B communicating with the lower end of the supply pipe 60, and is arranged in the axial direction in the pressure kneading cylinder 62A, and is supplied from the lower end of the supply pipe 60. Pressurizing screw 62B for extruding the fluid mixture to be flown toward the tip by rotation, and a hydraulic motor 6 for rotationally driving the pressurizing screw 62B.
2C and an injection cylinder 62D that reciprocates the pressure screw 62B axially in the pressure kneading cylinder 62A together with the hydraulic motor 62C. The pressurizing screw 62B is retracted to a predetermined position by the injection cylinder 62D while being pressure-kneaded and sent out in the distal direction, and when a predetermined amount of the mixture is fed to the distal end side of the pressurizing screw 62B, the pressurizing screw is driven by the injection cylinder 62D. 6
2B is driven forward, and the mixture measured in the above step is supplied into the female mold 64A of the compression molding machine 18 from the injection hole 62E at the tip of the pressure kneading cylinder 62A. The pressure kneading cylinder 62A is provided with a heating device (not shown) for heating the mixture inside.

The injection hole 62E is opened and closed at the tip of the pressure kneading cylinder 62A, and the female mold 64 is inserted through the injection hole 62E.
A cutting device 62F for cutting the end of the flowing mixture supplied to A is provided.

The kneader 16 as a whole is provided on a supply unit elevating device 66 as shown in FIG.
The vertical position of the injection hole 62E with respect to the female mold 64A can be adjusted.

Reference numeral 62G in FIG. 3 denotes a hydraulic motor 62C,
A linear guide 68 slidably supports the pressure kneading cylinder 62A in the axial direction. The linear guide 68 covers an upper portion of the opening 60A of the supply pipe 60, and represents a smoke exhaust duct for capturing water vapor and the like discharged from the supply pipe 60.

Reference numeral 64B in FIG. 5 denotes a male mold corresponding to the female mold 64A in the compression molding machine 18 and a female mold 6A.
When 4A is conveyed directly below the male mold 64B by the table slide device 72 on the supply station 70,
The mixture in the female mold 64A is pressure-formed.

In the figure, reference numeral 74 indicates that the female mold 64A
6 shows a molded product take-out device for taking out a formed kneaded product when transported on 6.

In the kneaded product manufacturing system 10 according to the embodiment of the present invention, the middle crushed wood pieces crushed to a medium degree by the middle crusher 22 are accelerated by the air flow in the crusher 24 to collide with each other. In this case, since the small pieces are made of wood, at this time, water or water vapor is released from the pieces of wood due to the collision energy, and this is immediately absorbed by the air flow and discharged outside through the scrubbers 30A and 30B.

Therefore, the water content of the wood fragments supplied from the crusher 24 is greatly reduced. Further, the resin pellets kneaded with the wood chips have a diameter of about 3 mm or 3 m.
m or less, even if it contains a non-thermoplastic resin, it can be easily melted and kneaded together with the wood chips, and kneaded and compressed while pressurizing the resin and paper waste in the pressure kneader 46. Since it is formed, the moisture contained in the paper waste is evaporated.

The resin pellets and the wood chips are uniformly mixed in the mixer 36. If the diameters of the resin pellets and the wood chips are made substantially equal beforehand, the mixer 36 Can be mixed with high uniformity.

As described above, since a large amount of moisture or water vapor is blown in advance when wood fragments are formed in the pulverizer 24, the amount of water vapor generated when the kneader 16 is kneaded and pressurized together with the resin pellets. Less is. Therefore, the processing time in the kneader 16 can be reduced.

The kneader 16 has a two-stage structure, and since the mixture is kneaded in the first-stage kneader 17A without being pressurized, steam is not trapped in the molten mixture.

Further, since the water vapor is radiated from the upper end opening 60A of the supply pipe 60, even if the water is pressurized by the second-stage kneader 17B, the water vapor does not enter the mixture and the strength of the product is not reduced.

Further, the transport of the wood fragments formed in the crusher 24 to the scrubbers 30A and 30B can be carried as they are by placing them on the airflow used to accelerate and collide the wood fragments with each other. The wood chips do not leak out of the system of the system, and the wood chips do not absorb moisture due to contact with the outside air.

In the above-described embodiment, paper dust is mixed with the resin pellets formed by the pellet manufacturing apparatus 14. However, the present invention is not limited to this. Fibers such as yarn may be mixed, or may not be mixed at all.

When paper dust is mixed, the upper limit is 50% by weight with respect to the resin. Since paper waste is a weak fiber, if it is mixed in more than 50%, the strength of the final molded product is reduced.

The mixing ratio of the wood chips depends on the kind of the resin to be kneaded, but is 15 to 55% based on the weight of the molded product.
Is appropriate.

Further, the water content of the wood chips formed by the pulverizer 24 is largely evaporated, and the water vapor can be released by the first-stage kneader without leaving it in the fluid mixture. There is no need to adjust the shape and size of the woody pieces during kneading in consideration of the effect of water evaporation during kneading and compression, and thus the size and shape can be freely set.

[0060]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a kneaded product of wood pieces and resin is manufactured by a kneaded product manufacturing system as shown in FIG.

First, the wood pieces are in a raw material state to be put into the mixer 36 and have a weight ratio of 20% to the whole, and the resin pellets are 30% of waste resin containing various resins and 30% of polypropylene to the total weight. , H as a reinforcing agent
A plate-shaped kneaded product (wood plastic plate) was manufactured by setting DTE (high density polyethylene) to 10% and fibrous material such as paper waste to 10% in a strip state.

The performance of the manufactured product is slightly higher than that of a normal polypropylene plate and slightly lower than that of water. The property was about 60% of that of the polypropylene plate. Therefore, it can be sufficiently used, for example, for formwork panels for buildings.

[0063]

According to the present invention, a kneaded product of a wood piece and a resin can be manufactured efficiently, and the shape of the wood piece is not limited. In addition, there is an excellent effect that a kneaded product can be manufactured by combining these treatments.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a kneaded product manufacturing system according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view schematically showing a crusher in the kneaded product manufacturing system.

FIG. 3 is an enlarged side view showing a pressure kneader and a compression molding machine in the kneaded product manufacturing system.

FIG. 4 is a plan view of the same.

FIG. 5 is a plan view showing a compression molding machine in the kneaded product manufacturing system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Kneaded product manufacturing system 12 ... Wood crushing apparatus 14 ... Pellet manufacturing apparatus 16 ... Kneader 17A ... 1st stage kneader 17B ... 2nd stage kneader 18 ... Compression molding machine 20 ... Coarse crusher 22 ... Medium crusher 24 ... Fine Crusher 26 Middle crushed piece hopper 28 Metal sorter 30A, 30B Scrubber 32A, 32B Fine crushed piece hopper 34 Weighing machine 36 Mixer 38 Transport pipe 44A, 44B Weighing machine 46 Pressurizing kneader 48 Pelletizer 50 ... Pellet hopper 54 ... Kneading cylinder 54A ... Inlet 54B ... Removal port 56 ... Screw 60 ... Supply pipe 60A ... Opening 62A ... Pressure kneading cylinder 62B ... Pressure screw 62E ... Injection hole 64A ... Female 64B ... Male

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[Procedure amendment]

[Submission date] March 26, 1998

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 4

FIG. 5

Claims (8)

[Claims] 1. A crushing step in which wood pieces are accelerated by an air stream and collide with each other to make wood pieces, and a step of producing fine resin pellets containing 45% or more by weight of a thermoplastic resin. And a mixing step of mixing the wood chips and the resin pellets, and transferring the wood chips and the resin pellets having been subjected to the mixing process forward while kneading in a kneader under heating, Is vaporized by the heating in the kneader, and this vapor is released from the kneader to the outside, and the kneading of the wood flakes and the thermoplastic resin from which the water content is substantially removed by the vaporization. A method for producing a kneaded product of a wood piece and a resin, wherein the material is kneaded while being further pressurized, and the mixture is poured into a mold having a required shape in a fluidized state to obtain a desired kneaded product. 2. A method according to claim 1, wherein said resin pellets are formed from a waste resin mixed with a non-thermoplastic resin as a raw material. 3. The method for producing a kneaded product of wood pieces and a resin according to claim 1, wherein the resin pellets contain 0 to 50% by weight of paper waste. 4. The method for producing a kneaded product of wood pieces and resin according to claim 1, 2 or 3, wherein the resin pellets have a diameter of 3 mm or less. 5. A wood crushing device which accelerates wood pieces by an air flow and crushes them by collision with each other to make wood pieces, and 0-50% by weight of fibers such as paper and cloth, and a thermoplastic resin. For producing resin pellets containing 100 to 50% by weight, a weighing device for weighing the wood chips and the resin pellets in a predetermined ratio, and uniformly disposing the wood chips and the resin pellets weighed by the weighing device. A mixer for mixing, a kneader for heating and kneading the mixture of the wood chips and the resin pellets mixed by the mixer, and a kneader having a required shape, and a mold having a required shape, are injected from the injection holes of the kneader. And a compression molding machine that drives the mixture into the mold to obtain a desired kneaded product.
A first-stage kneader and a subsequent second-stage kneader, and a steam release means provided between the first and second kneaders, for releasing steam generated from woody chips in the mixture to the outside by heating; The first-stage kneader has a cylindrical kneading cylinder having an input port into which the mixture is charged, an extrusion port provided on a side of the kneading cylinder opposite to the input port, and is arranged in the kneading cylinder in the axial direction. And, while kneading the mixture charged from the input port, while transferring the screw toward the extrusion port, and provided in the kneading cylinder, provided with a heating device for heating the mixture kneaded by the screw, Second
The stage kneader has a cylindrical pressure kneading cylinder having an inlet into which the de-steamed fluidized mixture is charged, an injection hole provided on the opposite side of the pressure kneading cylinder from the inlet, A pressure screw that is disposed in the pressure kneading cylinder in the axial direction, and pressurizes and kneads the mixture injected from the inflow port, is transferred to the injection hole, provided in the pressure kneading cylinder, A system for producing a kneaded product of a wood piece and a resin, comprising a heating device for heating a mixture kneaded by the pressure screw. 6. The wooden crushing apparatus according to claim 5,
A coarse crusher, a medium crusher, and a fine crusher, which sequentially crush small pieces of wood, are arranged in this order, and the fine crusher accelerates the wood pieces crushed by the medium crusher by an air flow to mutually intersect. A system for producing a kneaded product of a wood piece and a resin, wherein the kneaded product is further finely crushed by colliding the resin. 7. A crushed wood piece conveying means according to claim 6, wherein said wood flakes finely crushed by said crusher are conveyed to said weighing device by a part of said air flow. Production system for kneaded products of wood pieces and resin. 8. A wood chip according to claim 7, wherein air and wood powder containing water separated from the wood chip are separated from the wood chip by collision of the wood chip in the pulverizer at the end of the wood chip transportation means. A production system for a kneaded product of a wood piece and a resin, wherein a scrubber is arranged.