KR100770804B1 - Melting extruder for recycling of waste plastic and pelletation system for waste plastic using the same - Google Patents

Abstract

The present invention relates to an extrusion apparatus for melting and discharging waste synthetic resin used in agriculture, home, industrial, etc., and a waste synthetic resin pelletizing system using the same, in particular, even if the dehydrated waste synthetic resin dehydrated, it contains a lot of moisture, In order to allow dehydration and water evaporation using a screw in the process, the diameter of the rod-shaped body forming the screw is deformed according to a predetermined section, and a spiral body provided on the outer circumferential surface of the rod-shaped body. The present invention relates to a waste synthetic resin melt extrusion apparatus that can be processed in a subsequent process by melting the pitch of the shell by varying the pitch according to a predetermined section so as to melt while appropriately removing the water contained in the washed waste synthetic resin.

Waste synthetic resin extrusion apparatus according to the present invention drive means; A spiral body which is formed continuously by forming a pitch on the outer circumferential surface of the rod-shaped body in a direction coinciding with the rotation direction of the rod-shaped body and the rod body rotated by the driving means. A transfer screw comprising a line; The rod is rotated by the driving means and is shorter than the rod-shaped body of the transfer screw, and a constant pitch is formed on the outer circumferential surface of the rod-shaped body in a direction coinciding with the rotation direction of the rod-shaped body. A dewatering screw formed of a spiral body and arranged in a staggered form with the spiral body of the transfer screw, and rotating in a direction opposite to the transfer screw; A housing having a front inlet port and a rear end outlet port, accommodating the transfer screw and the dewatering screw, an inner diameter corresponding to the outer diameter of the spiral of each screw, and a drain hole formed in an arrangement section of the dewatering screw; And heating means for melting the waste synthetic resin conveyed by the conveying screw.

Waste synthetic resin, pellet, melting, washing, dehydration, heating, rod body, helix, diameter, corrugation, section

Description

MELTING EXTRUDER FOR RECYCLING OF WASTE PLASTIC AND PELLETATION SYSTEM FOR WASTE PLASTIC USING THE SAME}

1 is a schematic cross-sectional view of a waste synthetic resin melt extrusion apparatus according to the present invention and an exploded front view of a screw,

FIG. 2 is a schematic configuration diagram of a waste synthetic resin pelletization system using the melt extrusion apparatus of FIG. 1.

<Description of the symbols for the main parts of the drawings>

E: Extruder P: Pelletizing System

S1-S9, S1a, S2a, S3a: Section

10: transfer screw 20: dewatering screw

11,11a, 11b, 11c, 21,21a, 21b, 21c: rod-shaped body

13,13a, 13b, 13c, 23: helix 30: housing

31A: Inlet 31a: Hopper

31B: outlet 33: drain hole

35A, 35B: Drain hole 41: Driving means

43: heating means 50, 51, 53: shredder

51a, 53a: conveying conveyor 55: metal sorter

60, 60A, 60B: Washer 61: Stirring Screw

63: case 65: washing water supply means

70, 71, 73: Dehydrator 71a: Mesh Conveyor

81: molding machine 83: cooler

85: cutter 87: collector

The present invention relates to an extrusion apparatus for melting and discharging waste synthetic resin used in agriculture, household, industrial, etc., and a waste synthetic resin pelletizing system using the same.

In particular, even though the dehydrated waste synthetic resin is dehydrated, it contains a lot of water. In order to enable dehydration and water evaporation using a screw during melting,

The diameter of the rod-shaped body forming the screw is deformed according to a predetermined section, and the pitch of the spiral body provided on the outer circumferential surface of the rod-shaped body is varied according to the predetermined section and washed. The present invention relates to a waste synthetic resin melt extrusion apparatus that can be melted while appropriately removing moisture contained in waste synthetic resin to enable processing in a subsequent process.

As a technique for recycling waste films made of waste synthetic resins, more specifically thermoplastics, particularly PE, which is widely used for crop cultivation in rural areas.

Since Patent Publication No. 193-0000226 (1993.01.15) `` Synthetic resin molding apparatus using waste resin '' relating to crushing and molding the collected waste resin,

Patent Publication No. 2001-0046817 (June 15, 2001) `` Large Melting Apparatus of Waste Resin '',

Patent Registration No. 0365953 (2002.12.11) 『Recycling method of waste vinyl and waste vinyl pellet forming device』,

Utility Model Registration No. 0340378 (2004.01.20) `` Recycled chip manufacturing apparatus using waste vinyl '' and many others,

The technologies related to the conventional waste synthetic resin recycling apparatus are not realized or

Even if it is installed, it is not continuously used due to frequent failures, high operating cost, and production of low-quality recycled resin.

The reason for the low practicality of the known waste synthetic resin washing-melting-molding regeneration apparatus is that perfect cleaning of the waste synthetic resin is possible to produce high quality recycled resin because it is not easy to remove dirts such as soil stuck on the twisted and overlapping synthetic resin film. ,

In addition, even if the soil of the waste synthetic resin is relatively completely removed by using the wet washing method using water, it is impossible to completely remove the moisture simply by dehydration. Lowers,

This is because, in order to completely remove the water used during washing, if the drying is performed separately using hot air after the dehydration process, the cost of regeneration increases, and thus the cost competitiveness is reduced.

The present invention has been proposed to solve the imperfections of water removal pointed out in such a conventionally known waste synthetic resin wash-melt-molding regenerator, in particular a regenerator using a wet cleaning method.

Accordingly, an object of the present invention is to provide a waste synthetic resin melt extrusion apparatus that can be additionally dewatered by a pair of transfer and dewatering screw during melting in extrusion of waste synthetic resin that has undergone grinding, washing, and dehydration. .

In addition, the present invention deforms the diameter of the rod-like body constituting the transfer screw for each section, the pitch of the spiral body provided on the outer circumferential surface of the rod-shaped body according to the section It is an object of the present invention to provide a melt extrusion apparatus in which the molten synthetic resin is prevented from being overflowed while the moisture evaporated by proper exclusion and heating is released.

Furthermore, an object of the present invention is to constitute a waste synthetic resin pelletizing system including the melt extrusion apparatus.

In addition, the present invention is a dehydrator that can remove the dirt attached to the collected waste synthetic resin at the beginning of the waste synthetic resin pelletized to make the dehydrator of the inclined screw type to remove the dirt more completely while using a small amount of water It is an object to provide a system.

Waste synthetic resin melt extrusion apparatus according to the present invention for achieving the above object is a drive means; A spiral body which is formed continuously by forming a pitch on the outer circumferential surface of the rod-shaped body in a direction coinciding with the rotation direction of the rod-shaped body and the rod body rotated by the driving means. A transfer screw comprising a line; The rod is rotated by the driving means and is shorter than the rod-shaped body of the transfer screw, and a constant pitch is formed on the outer circumferential surface of the rod-shaped body in a direction coinciding with the rotation direction of the rod-shaped body. A dewatering screw formed of a spiral body and arranged in a staggered form with the spiral body of the transfer screw, and rotating in a direction opposite to the transfer screw; A housing having a front inlet port and a rear end outlet port, accommodating the transfer screw and the dewatering screw, an inner diameter corresponding to the outer diameter of the spiral of each screw, and a drain hole formed in an arrangement section of the dewatering screw; And heating means for melting the waste synthetic resin conveyed by the conveying screw.

Furthermore, the present invention deforms the diameter of the rod-shaped body constituting the transfer screw for each section, and also the pitch of the spiral body provided on the outer circumferential surface of the rod-shaped body according to the section. In order to provide a melt extrusion apparatus that is variable so that moisture is evaporated by proper exclusion and heating while molten synthetic resin is not overflowed.

First, in the rod-shaped body of the dewatering screw, the diameter of the rear portion is larger than the diameter of the front portion so that the diameter of the rear portion is large so that the water still contained in the waste synthetic resin subjected to the grinding-washing-dehydration process is dehydrated screw. To reduce the probability of continuing to be included beyond the intervals provided, and to allow for more complete additional dehydration,

In addition, the dewatering screw is arranged to be inclined to the front inlet of the housing to allow dehydration at the beginning of the melt extrusion apparatus,

In the housing after the dewatering screw to arrange the steam outlet in addition to the section to enable the discharge of moisture evaporated by the heat of melting,

In addition, in the section immediately before the steam outlet, the diameter of the rod-shaped body of the conveying screw is relatively increased (in the end, the bone diameter is increased), and in parallel, the pitch of the spiral body is reduced in the section of increasing the relative diameter of the conveying screw-shaped body (after all units). Increase the number of helices per length) to allow moisture to be pushed backwards to exclude

In the portion overlapping with the steam outlet and the subsequent section, the diameter of the transfer screw rod is relatively reduced to eventually reduce the bone diameter so as to prevent the problem of overflowing or reflowing the molten waste synthetic resin toward the steam outlet. It is preferable.

Furthermore, the waste synthetic resin pelletizing system according to the present invention comprises a crusher for crushing waste synthetic resin attached; A washing machine for removing dirt from the waste synthetic resin passing through the crusher; A dehydrator for removing moisture from the waste synthetic resin passing through the washer; A driving means, a rod-shaped body rotated by the driving means, and a continuous pitch formed on the outer circumferential surface of the rod-shaped body in a direction coinciding with the rotational direction of the rod-shaped body; A transfer screw comprising a hull, a rod-shaped body which is rotated by the driving means and shorter than the rod-shaped body of the transfer screw, and the rod-shaped body in a direction coinciding with the rotation direction of the rod-shaped body. Forming a constant pitch on the outer circumferential surface of the helical body, which is continuously formed and is arranged in a staggered manner with the spiral body of the transfer screw, and dewatering rotating in a direction opposite to the transfer screw. It has a screw, a front inlet and a rear end outlet, accommodates the transfer screw and the dewatering screw, has an inner diameter corresponding to the outer diameter of the spiral of each screw, The melt extrusion apparatus yirueojyeoseo including a housing, and a heating means for melting the waste plastic is conveyed by the conveyance screw in the drain hole is formed, to dissolve the waste plastic that has passed through the dehydrator in the array section; A molding machine provided at the rear of the extruder and continuously discharged into strands having a predetermined cross-sectional area; A cooler to cool the waste synthetic resin that has passed through the molding machine; And a cutter for cutting the waste synthetic resin that has passed through the cooler to a predetermined length.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In each of the drawings, the same reference numerals, in particular, the tens and ones digits, or the tens, ones and alphabets, refer to members having the same function, and unless otherwise specified, each reference is referred to. What is necessary is just to consider the member which conforms to these standards.

In addition, in the description of the melted resin extrusion apparatus and the waste synthetic resin pelletizing system using the same according to the present invention, if the direction reference is specified with reference to FIGS. 1 and 2, the collected waste synthetic resin is the first shredder in the pelletizing system (P). After passing through the (50) through the extrusion device (E) forming the core of the present invention, while passing through the cutter (85) again to determine the shredder (50) side forward in the transfer process pelletized, the cutter (85) ) To the rear.

First, as shown in FIG. 1, the waste synthetic resin melt extrusion apparatus E according to the present invention includes a transfer screw 10 and a dewatering screw 20 in the housing 30.

A hopper is formed at the front end of the housing 30 so as to be stably supplied while receiving the crushed-washed-dehydrated waste synthetic resin via the secondary dehydrator 73 constituting the waste synthetic resin pelletizing system P shown in FIG. An inlet 31A having 31a) is provided.

A discharge end 31B is provided at the rear end of the molten waste synthetic resin, and an extruder 81 continuously discharged into strands having a predetermined shape and cross-sectional area, such as noodles, is arranged at the discharge port 31B.

In addition, the housing 30 is formed with two vapor outlets (35A, 35B) for the discharge of the moisture contained in the waste synthetic resin due to the heat of melting.

The transfer screw 10 and the dewatering screw 20 embedded in the housing 30 are rod-shaped bodies 11 and 21, respectively, and the rod-shaped bodies in a direction coinciding with the rotational direction of the rod-shaped bodies. It consists of a spiral (13, 23) formed in a continuous pitch forming a constant pitch on the outer peripheral surface of,

In Figure 1, the dewatering screw 20 is arranged at the beginning of the extrusion device (E) for further dehydration of the moisture remaining in the waste synthetic resin even when the dehydration process in the previous dehydrator 70.

In addition, in FIG. 1, the dewatering screw 20 is preferably arranged side by side, rather than being arranged directly under the transfer screw 10, for the purpose of connection with other components such as driving means. Is shown as being arranged directly below the transfer screw 10,

Hopper 31a provided in the inlet 31A of the housing 30 is also shown separately on the upper right side for convenience of understanding,

The transfer screw 10 and the dewatering screw 20 are shown separately on the bottom.

The rod-shaped bodies 11 and 21 of each of the dewatering screw and the transfer screw will be rotated by a driving means, in particular an electric motor 41, wherein the connection of the motor and the rod-shaped body is a suitable intermediary means, for example a reducer. Or chain gear,

The heating means 43 for melting the waste synthetic resin may be made of a heater to be heated to a temperature of 200 ℃ or more, it may be in the form of directly heating the transfer screw (10).

In addition, it is preferable that bearings are provided at both ends of each of the screws 10 and 20 to reduce frictional resistance.

The relative size and shape of the housing 20 and each of the screws 10 and 20 is not narrow in contact with each spiral of the screw and the inner wall of the housing, but narrow enough to allow the waste synthetic resin to be transported by the spiral. It is desirable to maintain the separation distance,

Each of the spiral bodies 13 and 23 of the transfer screw and the dewatering screw does not contact each rod 21 and 11 but maintains a separation distance for transferring and compressing dehydration of the waste synthetic resin.

Each of the spiral bodies 13 and 23 is also not in contact with each other, and interlaced with each other, in particular, a pitch is coincident with each other, and the spiral of the transfer screw is positioned at the center of the spiral of the dewatering screw.

As a result, the outer diameter of the helix of each screw and the inner diameter of the housing, the pitch and spacing of each screw helix, the rod diameter of each screw, and the shape and arrangement of the housing and each screw, 'do.

In the waste synthetic resin melt extrusion apparatus (E) according to the present invention, the feed screw (10) is formed to additionally and more reliably remove the remaining water even when wet-washed and dehydrated using water to increase the quality of the recycled resin. It was considered that the diameter of the rod-shaped body was deformed for each section, and the pitch of the spiral body provided on the outer circumferential surface of the rod-shaped body was also varied according to the section.

In this case, for the convenience of manufacturing, the transfer screw 10 and the dewatering screw 20 may be manufactured separately for each diameter of the rod-shaped body, and then assembled using a fastening means such as a welding or screwing method.

In this case, the housing 10 is also preferably in the form of the powder is assembled for the convenience of manufacturing, transport, assembly, etc., in Figure 1 such a housing shape is shown in the contact surface of each powder (three in the figure) A flange (not shown) is provided which can be fastened by bolts and nuts.

After the dehydration, the crushed-washed-dehydrated waste synthetic resin introduced into the extruder E through the hopper 31a will not melt immediately because the heat of fusion has not yet been sufficiently transferred.

The direction of rotation of each of the screws 10 and 20 is reversed by the driving device 41, and the direction of forming the spiral bodies 13 and 23 of each screw is the direction of rotation of the rod-shaped bodies 11 and 21. Matches

Waste synthetic resin injected through the hopper (31a) is forwarded

In the section S1, since the spirals 13 and 23 of the transfer screw 10 and the dewatering screw 20 cross each other, dehydration is performed.

A drainage hole 33 is formed at the bottom of the bottom of the housing 30 so that water can be discharged by dehydration and accumulated in the bottom of the housing 30.

The transfer screw 10 is divided into sections S1 to S9 according to the diameter of the rod-shaped body 11 and the pitch of the spiral body 13 (reference is indicated by '1' pitch),

According to the diameter of the rod-shaped body 21 in the dewatering screw 20 divided into sections S1a to S3a,

The diameters of the rod-shaped bodies 11 and 21 are respectively indicated.

The specification and shape of each screw 10, 20 is obtained through the repeated development process of the inventor of the present invention for melt extrusion of a specific capacity, the present invention is not limited by these numerical values,

The outer diameters of the helixes in each of the screws 10 and 20 were designed to be ø 150.

The conveying screw 10 has a diameter of ø 90 in the section S1, the interval of the spiral 13a is a '1' pitch set as a reference,

The dewatering screw 20 overlapping the section S1 of the transfer screw 10 is divided into three sections, S1a, S2a, S3a,

In the section S1a, the diameter of the rod-shaped body 21a is ø100,

In the section S2a, the diameter of the rod 21b increases from ø 100 to ø 130,

In the last section S3a, the diameter of the rod 21c is ø 130,

As such, the bone diameter increases to increase the diameter of the rod-shaped body of the transfer screw 10 toward the rear, so that the moisture contained in the waste synthetic resin is squeezed gradually as the moisture is transported to the rear to squeeze the moisture.

Next, in the section after the dehydration screw 20 in the housing 30, steam outlets 35A and 35B are provided, and as the waste synthetic resin is gradually heated by the heating means 43, the remaining synthetic resin remains moisture. It provides a passage that can be discharged when evaporated, the steam outlet is connected to a pipe, such as a chimney, so that it is easy to discharge steam to the top,

The number of steam outlets may be provided with three or more when the specific shape of the transfer screw described below, but will be appropriately selected in consideration of the processing capacity and manufacturing cost.

Furthermore, the section immediately before the steam outlets 35A and 35B,

That is, in the sections S2 and S3 before the first steam outlet 35A

In the section S2, the rod-shaped body 11b of the transfer screw 10 increases in diameter from ø90 to ø135, and the spiral body 13a is one pitch,

In the section S3, the rod-shaped body 11c of the transfer screw 10 has a diameter of ø135, and the spiral body has a reduced pitch, and the pitch is 1/2 pitch in the drawing, in addition to the conventional first spiral body 13a. The hull 13b is provided so that the water contained in the waste synthetic resin is squeezed out and pushed forward without being evaporated.

In the sections S5 and S6 before the second steam outlet 35B, the shape and the diameter of the rod and the spiral body are the same as those of the sections S2 and S3.

However, in the section S6, the spiral body makes a pitch of 1/4, and the first, second, and third spiral bodies 13a, 13b, and 13c are formed so that the remaining moisture can be removed by more powerful compression. different.

In addition, in the portion overlapping with the steam outlet (35A) (35B) and the subsequent section, that is, the sections S4 and S7 the diameter of the transfer screw rod body is relatively reduced and eventually the bone diameter is reduced to restore the original to ø 90

This is to prevent the molten waste synthetic resin from overflowing to the steam outlets 35A and 35B or backward flowing of the molten waste synthetic resin, and the spiral body is made to have a pitch of 1/2.

Finally, in the section adjacent to the rear outlet 31B of the housing 30, the diameter of the rod-shaped rod 10 is relatively increased.

That is, in the section S8, the rod 11b increases in diameter from ø 90 to ø 135,

In the section S9, the rod-shaped body 11c of the transfer screw 10 has a diameter of ø135, and in both sections S8 and S9, the spiral body 13a is one pitch,

The molten waste synthetic resin is introduced into the molding machine 81 to be pulled into strands having a predetermined shape and cross-sectional area, such as noodles, so that extrusion molding is possible.

Next, the waste synthetic resin pelletizing system P using the melt extrusion apparatus E described with reference to FIG. 1 will be described.

First, a waste film made of waste synthetic resin, more specifically, a thermoplastic resin, especially PE, which is widely used for crop cultivation in rural areas, is collected.

In the crusher 50, the crusher is a primary crusher 51 for cutting waste synthetic resin introduced through the conveyor belt (51a) to a size of several centimeters to several tens of centimeters,

Again, the waste synthetic resin discharged from the lower part of the primary shredder 51 is also made of a secondary shredder 53 that is received through the conveyor belt 53a and pulverized to a size of several mm ~ several cm.

In addition, the conveying conveyor 53c for the secondary crusher 53 is provided with a known metal sorter 55 (eg, a sorter using a magnet) so that metal removal is possible.

Next, the washing machine 60 is arranged to wash the dirt, such as the soil attached to the waste synthetic resin shredded to an appropriate size,

The washing machine 60 also includes a screw type primary washer (60A) and a water tank type secondary washer (60B) to remove dirt.

The primary washing machine (60A) is in a spiral body having a twisting direction coinciding with the rotation direction while the stirring feed screw (61) is rotated by a driving means (not shown) inside the case (63) arranged in an inclined form. The waste synthetic resin is crushed and discharged to the lower part of the secondary crusher 53 is transferred,

The dirt attached to the waste synthetic resin is washed by the washing water from the washing water supply means 65 provided on the case 63 so as to be discharged to the lower portion of the case.

Even though a small amount of water is used, the initial dirt can be more completely removed, thereby reducing the washing load of the secondary tank washer 60B.

The secondary washer (60B) is in the form of a water tank, the waste synthetic resin passed through the primary washer (60A) is to be washed by water through a stirrer.

Subsequently, the waste synthetic resin washed with the secondary washer 60B is subjected to a dehydrator 70 to remove water.

The dehydrator is also made up of primary and secondary dehydrators 71 and 73,

The primary dehydrator (71) receives the waste synthetic resin from the secondary washer (60B) through a mesh conveyor (71a) to be discharged preferentially, the dehydration is made by a pair of skews,

The secondary dehydrator 73 is a known flop type.

The waste synthetic resin subjected to the first and second dehydration processes is melted by additionally excluding water by screw compression and evaporation through the waste synthetic resin melt extrusion apparatus (E) of the present invention described above.

In the molding machine 81 is drawn and discharged into a strand of a predetermined shape,

It is then cooled while passing through a cooler 83, in particular a cooler consisting of a water tank for water-cooled cooling,

It is cut to a certain length in the cutter 85 and produced as a pellet-type recycled synthetic resin,

Finally, the collector 87 may be packaged in a bag or box.

As described above, the waste synthetic resin melt extrusion apparatus according to the present invention may be additionally dehydrated by a pair of transfer and dewatering screws in the melting process in melt extruding the waste synthetic resin that has undergone the grinding, washing, and dehydration process. The diameter of the rod-shaped body constituting the transfer screw is deformed for each section, and the pitch of the spiral body provided on the outer circumferential surface of the rod-shaped body is also changed according to the section. Moisture evaporated by moisture exclusion and heating is released, but molten synthetic resin does not overflow.

Furthermore, the present invention can provide a waste synthetic resin pelletizing system including the melt extrusion apparatus, and in particular, a dehydrator of the inclined screw type as a dehydrator capable of initially removing the dirt attached to the collected waste synthetic resin to form a small amount You can use it to remove dirt more completely.

In the above description, although the conventionally known techniques related to the pulverization, washing, dehydration, and melting of the waste synthetic resin are omitted, those skilled in the art will naturally be able to infer and deduce this.

In addition, in the following description of the present invention with reference to the accompanying drawings, the melting apparatus and pelletizing system having a specific shape and structure, the present invention can be variously modified and changed by those skilled in the art, such modifications and changes are present invention It should be interpreted as falling within the protection scope of.

Claims (9)

Drive means; A rod-shaped body rotated by the driving means, A conveying screw which is continuously formed on the outer circumferential surface of the rod-shaped body in a direction coinciding with the rotational direction of the rod-shaped body, and includes a spiral body having a pitch that is varied according to the waste synthetic resin melting process ; A rod-shaped body shorter than the rod-shaped body of the transfer screw so as to be rotated by the driving means and overlapping only the rod-shaped body of the transfer screw and the front initial section , The spiral of the transfer screw is formed continuously on the outer circumferential surface of the rod in a direction coinciding with the rotation direction of the rod, and has a pitch equal to that of the transfer screw helix to overlap each other. Consisting of spirals arranged in a staggered form with A dewatering screw rotating in a direction opposite to the conveying screw; A housing having a front inlet port and a rear end outlet port, accommodating the transfer screw and the dewatering screw, an inner diameter corresponding to the outer diameter of the spiral of each screw, and a drain hole formed in an arrangement section of the dewatering screw; And Heating means for melting the waste synthetic resin conveyed by the transfer screw Waste synthetic resin melt extrusion device comprising a. The method of claim 1, The rod-shaped body of the dewatering screw is larger in diameter from the front to the rear, the diameter of the spiral is uniform , the waste synthetic resin melt extrusion apparatus, characterized in that the diameter of the rear portion is increased . The method according to claim 1 or 2, The dewatering screw is arranged to be inclined to the front inlet of the housing, The housing is a synthetic resin melt extrusion device, characterized in that the steam outlet is provided in the section after the dewatering screw. The method of claim 3, wherein The diameter of the transfer screw rod body in the section immediately before the steam outlet is increased compared to the diameter in the section overlapping the dewatering screw , The diameter of the conveying screw helix is constant waste melt resin extrusion apparatus characterized in that the end diameter is increased. The method of claim 4, wherein The pitch of the spiral body in the section immediately before the steam outlet, the diameter of the transfer screw rod body increases, compared to the pitch in the section overlapping the dewatering screw melt waste extrusion apparatus. The method of claim 5 , In the portion overlapping with the steam outlet and in the subsequent section, the diameter of the transfer screw rod body is reduced compared to the rod body diameter in the previous section , The diameter of the conveying screw helix is constant waste melt resin extrusion apparatus characterized in that the end diameter is reduced. The method of claim 6 , The diameter of the conveying screw rod body in the section adjacent to the rear outlet of the housing is characterized in that the melt resin extrusion apparatus is increased compared to the rod body diameter in the previous section . A shredder to break up the waste synthetic resin to which dirt is attached; A washing machine for removing dirt from the waste synthetic resin passing through the crusher; A dehydrator for removing moisture from the waste synthetic resin passing through the washer; Driving, The rod body rotated by the driving means and the outer circumferential surface of the rod body in a direction coinciding with the direction of rotation of the rod body are continuously formed, and the pitch is variable according to the waste synthetic resin melting process. A conveying screw comprising a spiral body having The rod-shaped body is shorter than the rod-shaped body of the transfer screw so as to overlap only the rod-shaped body of the transfer screw and the front initial section by the driving means, and in the direction coinciding with the rotation direction of the rod-shaped body. Helical bodies which are continuously formed on the outer circumferential surface of the rod-shaped body and are arranged in a staggered form with the spiral body of the conveying screw so as to have a pitch equal to the pitch of the conveying screw helix overlapping each other. ), The dewatering screw to rotate in the opposite direction to the transfer screw, A housing having a front inlet port and a rear end outlet port, accommodating the transfer screw and the dewatering screw, an inner diameter corresponding to the outer diameter of the spiral of each screw, and a drain hole formed in an arrangement section of the dewatering screw; Heating means for melting the waste synthetic resin conveyed by the transfer screw Consisting of, A melt extrusion apparatus for melting the waste synthetic resin passing through the dehydrator; A molding machine provided at the rear of the extruder and continuously discharged into strands having a predetermined cross-sectional area; A cooler to cool the waste synthetic resin that has passed through the molding machine; And Cutting machine to cut the waste synthetic resin passed through the cooler to a certain length Waste synthetic resin pelletization system comprising a. The method of claim 8, wherein the cleaner Agitation feed screw arranged in an inclined form; A case provided outside the stirring feed screw and having a drain hole formed at a lower portion thereof; And Washing water supply means for supplying the washing water to the upper case Waste synthetic resin pelletizing system comprising a primary washer comprising a.

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