KR101852683B1 - Extrusion molding machine and method for manufacturing wood power-plastic pipe using the same - Google Patents

Abstract

The present invention relates to an extrusion molding machine and a method of manufacturing a woodpipe plastic pipe using the same, and more particularly, to a method of manufacturing a woodpile plastic pipe having improved physical properties such as strength and ease of manufacture by improving the disadvantages of the paper pipe.

Description

TECHNICAL FIELD [0001] The present invention relates to an extrusion molding machine and a method of manufacturing a wood-plastic pipe using the same,

The present invention relates to an extrusion molding machine and a method of manufacturing a woodpipe plastic pipe using the same, and more particularly, to a method of manufacturing a woodpile plastic pipe having improved physical properties such as strength and ease of manufacture by improving the disadvantages of the paper pipe.

A pipe called a bobbin, a paper tube, or a drum is used for wrapping, transporting, or storing long paper, vinyl, or cloth.

Among them, paper tubes and paper cores are widely used, but they are weak in strength, vulnerable to heat and humidity, have a complicated manufacturing process, and are expensive and require development of alternative products.

A tubular bobbin is disclosed in Japanese Utility Model Laid-Open Publication No. 1998-0027350 (Oct. 08, 08.05). The inner tube 22 and the outer tube 21 constituting the bobbin 1 are supported by several support pieces 20, The space 11 and the inner tube 11, which are formed in the shape of a double pipe by the formation of the support pieces 20 and are formed between the support pieces, The through hole 10 formed by the outer circumferential surface serves to absorb the external pressure or impact of the bobbin. The bobbin has a low specific gravity due to the formation of the space portion 11 and the through hole 10, It is possible to reduce the unit cost.

[0003] Japanese Patent Application Publication No. 10-0590320 (Jun. 15, 2006) discloses a drum for a durability improved durability, in which a reinforcing layer of fiber reinforced plastic (FRP) is further formed on the outer circumferential surface of the drum body, And a reinforcing layer made of a fiber-reinforced plastic material that is integrally formed on the outer circumferential surface of the drum body, the reinforcing layer being formed of a rotating shaft or a rotating shaft hole provided on both sides of the drum body.

In the construction of the winding drum 2 in which the compressed paper is wound on the outer surface of the iron core 1, the outer surface of the winding drum 2 is formed into a paper tube 3 having an appropriate thickness And a reinforcing agent 4 made by mixing waste such as waste paper or polyurethane or straw with an adhesive between the core tube 3 and the iron core 1 is filled.

The molecular structure bi-oriented plastic pipe manufacturing apparatus and method thereof disclosed in Patent Registration No. 10-1387304 published Apr. 18, 2014 includes a central body 14 and a plurality of (1, 17, 14) formed by a first head (1) and a second head (17) connected to the sides of the mold (1, 17, 14) Rigid and perforated guide 5 centered axially such that the pipe 10 before shaping is mounted on the guide 5 in the longitudinal direction. The guide is provided with holes 9 so that an expansion fluid 18 passes through the holes 9 to inflate the pipe before molding to form the inside of the mold 1, Heat exchange is not caused between the pipe 10 before molding and the molds 1, 17, and 14

[0003] In a patent publication No. 10-0495768 published on June 17, 2005, there is disclosed a paper tube for winding a woven fabric, which is formed by joining a flange to the outer surface of a reinforcing sphere inserted at both ends of a paper tube, It is possible to prevent the deformation and damage of each pipe as well as wear and deformation and to reduce the cost and weight by forming the pipe only in the necessary part by placing the pipe only between the hollow steel bar hollow provided at the outermost side of each of the one end and the other end of the branch pipe, The present invention relates to a core tube for winding a woven fabric, which increases the stability of engagement between a reinforcement and a tube by forming a locking protrusion on one side of each tube.

2003.11.01. The registered Utility Model Registration No. 20-0332016 discloses a plywood molding machine using plastic, rice hull and wood flour as a main material. When a mixed raw material mixed with plastic, rice hull and wood powder is put into the machine, the melt molding extruder And an upper and a lower mold in which the mixed raw material having passed through the melt extruder is supplied, and then the mixed raw material is compressed and molded into a plywood.

Open No. 2007-0001558 published on Jan. 07, 2005 discloses a plywood molding apparatus using plastic, rice husks and wood flour (powder obtained by crushing wood) as a main material, A melt extruder 10 for melt-extruding a mixed raw material mixed therewith, and an upper and a lower mold 20 for pressing the mixed raw material through the melt extruder 10 to form a plywood , 30), which is connected to a discharge port of the melt-extruder (10), and when the molten mixed material flows into the mold, a plate-shaped die (100) for molding the mixed material into a flat plate shape; First and second conveyors (200, 300) sequentially installed between the plate-forming die (100) and the lower die (30) to feed the mixed raw material toward the lower die (30); Heating tunnels (400, 400a) respectively formed on the first and second conveyors (200, 300) and provided with heating means (410) for heating the mixed raw material so as not to be hardened during transportation; A guide roller 500 and a guide slider 600 for transferring the mixed raw materials discharged from the plate-forming die 100 to the first conveyor 200; The first sensor (210) provided directly above the guide roller (500) is provided with a cutter (700) for cutting down the mixed raw material when it senses the mixed raw material conveyed, ; One end is fixed to one side of a rail supporter 800 supporting the first and second conveyors 200 and 300 and the other end is fixed to a second conveyor 300. A second conveyor 300 And a hydraulic cylinder (900) for advancing the second conveyor (300) toward the lower mold (30) when the sensing sensor (310) senses the mixed raw material to be conveyed. It is a plywood molding machine.

[0005] Japanese Patent Application No. 10-0824752, published on Apr. 23, 2008, discloses a hot melt extruder comprising an extruder for melting a thermoplastic resin, a storage tank for temporarily storing the molten plastic from the extruder, and a mixer for mixing sawdust and molten plastic in the storage tank A sawdust plastic board including a roller for shaping the molten plastic mixed with sawdust coming from the mixer into a board form and a conveyor belt device connected to the rear end of the roller to compress the molten plastic mixed up with the sawdust up and down, A method and an apparatus for manufacturing the same are disclosed.

The utility model 20-0324458 published on Aug. 25, 2003 can generate high temperature even under heating to low temperature to save energy. Furthermore, even when the waste synthetic resin is regenerated, the waste synthetic resins can be crushed, There is disclosed an opposite feed twin screw extruder which can be melted or softened, does not burn a thin film and does not generate smoke or burning solid material, and can be crushed, heated, melted or softened to be discharged at once. And has the same configuration as the one shown in FIG.

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The present invention aims to improve the disadvantages of the paper tube which has been widely used in the past, and to produce a substitute product which is high in strength, resistant to moisture, low in cost and easy to manufacture.

The present invention seeks to manufacture a woodpiped plastic pipe which is superior in quality to a conventional paper pipe while simplifying the manufacturing process.

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According to an aspect of the present invention, there is provided an extrusion molding machine including: a screw having a threaded portion; a screw shaft integrally connected to a front end of the screwed portion, the drive shaft transmitting rotational power; A body having a receiving space formed therein for receiving the screw so as to rotate in a state in which the screw is in close contact with the inlet, A thrust bearing coupled to one end of the body for rotatably supporting the screw and supporting the drive shaft; a thrust bearing for preventing the screw from being pushed back; A bearing assembly provided with a gasket provided between the screw portion and the bearing assembly; And an extrusion die coupled to the other end of the body and having an annular gap formed between the shaft end and the extrusion die; And a cooling device for injecting cooling water or cooling air to cool the pipe discharged from the annular gap of the extrusion die.

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In addition, the method for manufacturing a woodpowder pipe according to the present invention comprises mixing pelletized plastic and wood powder in a ratio of 10 to 40% by weight of 60 to 90%, and then, in a twin-screw extruder, Mixing and melting the plastic by heating under pressure at 70 atm and mixing with the wood; Extruding a mixture of the molten plastic and wood powder under pressure at a temperature of 150 to 200 DEG C and a pressure of 50 to 70 atmospheric pressure in the extruder; A cooling step of spraying chilled air or spraying cooling water on the wood fiber plastic pipe; And a finishing step of cutting the cooled wood fiber plastic pipe to a required length.

As described above, according to the method and apparatus for manufacturing a woodpipe plastic pipe of the present invention, it has the advantage that it is stronger in moisture, higher in mechanical strength, less in abrasion and less in dust generation than a paper tube made of paper.

In addition, the wood-plastic pipe according to the present invention is lighter in weight than the conventional plastic pipe and has a higher strength.

In addition, the wood-plastic pipe according to the present invention can be recycled after being used again.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a process for manufacturing a pipe according to the present invention;
2 is a cross-sectional view of an extruder according to a preferred embodiment of the present invention
Fig. 3 is a cross-sectional view of a conventional countercurrent twin screw extruder

Hereinafter, specific configurations and operations of the present invention will be described with reference to the accompanying drawings.

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First, an apparatus for producing a wood-fiber-reinforced plastic pipe according to the present invention, that is, an extrusion molding machine will be described. The extruder (10) of the present invention comprises a screw (20); A body 30; A bearing assembly (40) for supporting the screw; And an extrusion die 50 coupled to an end of the body.

The screw 20 has a threaded portion 23 formed with a thread 22, a drive shaft 24 integrally connected to the front end of the threaded portion to transmit rotational power, and a shaft end 26 provided at the rear end of the threaded portion. At this time, the sectional shape of the screw 20 is indicated by reference numeral 21. As can be seen, the screw threads 22 are designed to have a 120-degree phase so that the distribution of the rotational force is uniform. Of course, the positions of the threads may be divided by 180, 90 or 60 degrees.

An annular gap is formed between the shaft end 26 and the extrusion die 50. The annular gap is formed in the discharge port 50 through which the wood-plastic pipe obtained through the process of the present invention is discharged (51), and the wood-plastic pipe is extruded at this outlet. The size of the annular clearance outlet 51 is determined by the difference between the diameter D2 of the shaft end 26 and the diameter D1 of the cylindrical hole of the extrusion die.

The thickness t of the wood fiberglass plastic pipe is 1/2 of the difference between the diameter D1 of the extrusion die hole and the diameter D2 of the shaft end and expressed as t = (D1-D2) / 2.

The body 30 has a housing space for accommodating the screw 20 in a state in which the screw 20 is closely contacted thereto and an inlet 32 is formed in a side surface of the body so that the extrudate is drawn into the housing space.

The bearing assembly 40 rotatably supports the screw 20 and includes two bearings 41 and 42 for supporting the drive shaft 24 and a thrust bearing 45 for preventing the screw from being pushed back, So that the drive shaft is firmly supported and rotatable.

The bearing coupling body 40 is coupled to the body by screws 46, and a bearing protection cover 48 is coupled to the bearing coupling body by a screw 49. The drive shaft 24 is exposed from the bearing protection cover 48 and a driving shaft (not shown) for transmitting power is coupled to rotate the screw.

A gasket 47 is provided between the threaded portion 23 and the bearing assembly 40 provided in the receiving space of the body so that the gasket 47 can pressurize the pressurized plastic flow material To move in the direction of the bearing assembly 40.

In the present invention, a cooling device (not shown) is additionally installed at the downstream end of the extrusion die to cool the wood fiber plastic pipe discharged from the extrusion die 50. The cooling device injects cooling water or cold air (cooling gas), and a known cooling device such as a water injector for injecting cold water at a high pressure or an air conditioner for blowing cold air can be used.

Next, a method for manufacturing a woodpump plastic pipe using the apparatus for manufacturing a woodpump plastic pipe according to the present invention will be described in detail.
[1] Mixed melting

First, pelletized plastic (hereinafter, referred to as plastic) and wood powder were mixed, and the wood and plastic were mixed in a ratio of 10 to 40% by weight: 60 to 90%, and this was mixed with a conventional twin screw extruder When the mixture is heated to a temperature of 150 to 200 ° C., the plastic is melted and mixed with the wood.

Then, the wood flour mixture sufficiently mixed in the twin screw extruder is extruded at a high pressure of 50 to 70 atm.
[2] extrusion molding

The mixture of the molten plastic extruded at a high temperature and high pressure and the wood powder is introduced through the inlet 32 of the screw extruder 10 according to the present invention and extruded at a high pressure.

That is, the raw material of plastic and wood powder is pressurized by the twin-screw extruder at a temperature of 150 to 200 ° C and a pressure of 50 to 70 atm, and then the mixture is extruded by a screw extruder (10) 70 atmospheric pressure and extruded to the annular gap outlet 51 of the extrusion die 50 to form a wood-plastic pipe.

At this time, the thickness of the pipe can be adjusted according to the purpose of the pipe. Such adjustment can be accomplished by replacing the die 50 and installing a new die having a proper dimension.
[3] Cooling

Cooling is sprayed to the extruded wood fiber plastic pipe using the cooling device or cooling water is injected to cool the plastic pipe.

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Then, the cooled woodpick plastic pipe is moved by a separate guide mechanism, and is cut and shipped to a required length in accordance with the dimension of the product to be applied.

As described above, the woodpipe plastic pipe manufactured by the present invention is strong against moisture, mechanical strength, and light weight, compared with a paper tube made of paper.

In addition, since such woodpipes do not wear well when using plastic pipe, dust does not occur unlike paper paper tubes and the life of the product becomes longer.

The wood-plastic pipe of the present invention can be used after being pulverized and recycled.

10: extruder 20: screw
22: thread 23: thread
24: drive shaft 30: body
32: inlet 34:
40: bearing assembly 41, 42: bearing
45: Thrust bearing 46, 49: Screw
47: Gasket 48: Bearing protection cover
50: extrusion die 51: outlet
D1: Extrusion die hole diameter D2: Axial end diameter

Claims (7)

A driving shaft 24 for receiving a rotational power at the front end of the threaded portion and a shaft end 26 having a predetermined length formed at the rear end of the threaded portion and the screwed portion 23 having the threaded portion 22, A screw 20 integrally rotating on the same axis;
A body 30 having a cylindrical receiving space for receiving the screw so that the screw 20 can rotate in a close contact state and an inlet 32 through which a mixture of wood and a molten plastic is introduced into the side surface;
Two bearings 41 and 42 coupled to one end of the body 30 to support the drive shaft 24 of the screw so that the screw 20 can rotate within the body, A bearing assembly (40) including a thrust bearing (45) mounted on a drive shaft between the two bearings;
The screw threaded portion 23 in the receiving space of the body 30 and the bearing assembly 40 in the receiving space of the body 30 are prevented from moving in the direction of the bearing assembly 40, A gasket (47) installed between the gasket (40); And
And an extrusion die (50) having a circular through hole coupled to the other end of the body, wherein the extrusion die (50) is coupled with an axial end (26) of the screw to form an inner surface of the extrusion die 26) is formed with a circular through-hole around the shaft end without contact with the outer surface of the shaft, and the pressurized mixture in the body passes through the circular through- Extruder. The method according to claim 1,
Further comprising a cooling device for spraying cooling water or cooling air to cool the pipe discharged from the annular gap of the extrusion die (50). The plastic and wood powder in the form of pellets are mixed in a ratio of 10 to 40% by weight: 60 to 90%, and the plastic is melted while being heated to a temperature of 150 to 200 ° C in a twin-screw extruder, A mixing and melting step of extruding at 70 atm;
The mixture of the extruded plastics and wood flour is introduced into the body 30 through the inlet of the extrusion molding machine 10 of claim 1 and the mixture is heated at a temperature of 150 to 200 ° C and a pressure of 50 An extrusion molding step of obtaining a wood-plastic pipe by pressure-extruding again to 70 atm and passing through an annular gap of the extrusion die 50;
A cooling step of spraying chilled air or spraying cooling water on the wood fiber plastic pipe; And
And a finishing step of cutting the cooled wood fiber plastic pipe to a required length,
Wherein the molten plastic and the wood powder mixture pressurized in the extrusion molding step are formed into a pipe shape and are moved without an obstacle obstructing the flow at the time of discharge so that the distribution of plastics and wood powder does not change due to obstacles. Pipe manufacturing method.
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