KR101301555B1 - Processing method of polyethylene pipe - Google Patents

Abstract

PURPOSE: A processing method of a recycling material for manufacturing a polyethylene pipe is provided to recycle a synthetic resin product, which is generally discarded after being used, by melting the product to manufacture a polyethylene pipe. CONSTITUTION: A processing method of a recycling material for manufacturing a polyethylene pipe comprises the steps of: pulverizing a polyethylene container or a synthetic resin product formed of a polyethylene material into pieces (A) having a size of 2 to 3 cm; removing impurities by washing the pulverized synthetic resin pieces through a washer; drying the washed synthetic resin pieces by using a dehydrator after adding water and the synthetic resin pieces at a weight ratio of 10:1, setting a rotation rate of a dehydrator rotation body at RPM 800, and repeating the drying process for 3 times at a time interval of 30 to 40 seconds; drying the resultant using hot air while maintaining a temperature of 60 to 80°C for 30 to 50 minutes; manufacturing the dried synthetic resin pieces in a shape of a stick by heating the resultant to a temperature of 180 to 270°C and pressing the melted resultant into the shape of a stick with a diameter of 3.5 to 6 mm; cutting the pressed stick into a form of a chip such that the chip has a length of 4 to 6 mm; and cooling the manufactured chip at a temperature of 20 to 25°C by using an air cooling method for 30 to 50 minutes, and thus a synthetic resin chip for manufacturing a polyethylene pipe is completed.

Description

Processing method of recycled raw material for producing polyethylene pipes

The present invention is a recycled raw material processing method for producing polyethylene pipes for producing polyethylene pipes (corrugated pipes for wires, corrugated pipes for water pipes, etc.) by reusing the injection-molded product produced in a polyethylene container or various products, without being discarded as it is. It is about.

In particular, the present invention is subjected to the crushing step of cutting the product for regeneration to a certain size, when washing and dehydration, using a dehydrator three times at a rotational speed of RPM 800 to try dehydration is always clean and After the step is carried out in a dry state, and after liquefying the pieces of the injection through the drying and melting steps, the chip rhythm is extruded to a diameter of about 5mm by applying an appropriate pressure, and the length is about 5mm. The present invention relates to a method for processing recycled raw materials for producing polyethylene pipes for cutting and re-producing polyethylene pipes by injection molding.

In general, synthetic resin penetrates our daily life and is manufactured in various products. Increasingly, the use of plastic bottles or polyethylene containers, which are commonly used as beverage bottles, as well as housings of various electronic products and covers of products are gradually increasing. However, as these uses are increased, they are mass produced together with the wastewater.

In other words, synthetic resin does not become decomposed even after a long time, and is accumulated in nature to become the main culprit of environmental pollution. In the end, the conventional method to solve this problem is to re-produce the synthetic resin product after use and reuse it as another product. To this end, the synthetic resin product for recycling must remove a large amount of impurities. In general, the conventional method of regenerating the synthetic resin is to break the appearance of an injection molded product such as a plastic bottle or a polyethylene container 81 as shown in FIG. Begins with. It is the work of shredding. The torn pieces of the resin 82 in the form of small pieces 82 are washed again to remove the possibility of containing impurities, and also to remove the synthetic resin powder that is too brittle to form a powder.

The subsequent work is to melt and extract the rhythm 84, cut it again in the form of a chip 85, and then use this injection chip 85 to produce another product. In producing other products, an important key is whether these recycled chips are produced as pure synthetic chips 85 containing no impurities and are injected into them. Chip 85 is particularly easy to produce other products only when the ash content is low. In the production of other products, other components are also added and melted together with the injection chips, the dosage of which depends on the characteristics of the product being produced. If the production of the injection chip contains a lot of impurities such as ash, the quality of the product produced is likely to be poor durability.

After all, the chip is a small chip itself without a form, but the material properties to be manufactured should be excellent, most conventional manufacturing methods did not satisfy this.

The present invention is to provide a recycled raw material processing method for producing a polyethylene pipe for producing a polyethylene pipe after using the injection-molded injection molded product into a polyethylene container or various products, without being discarded as it is.

In particular, the present invention is subjected to the crushing step of cutting the product for regeneration to a certain size, when washing and dehydration, using a dehydrator three times at a rotational speed of RPM 800 to try dehydration is always clean and After the step is carried out in a dry state, and after liquefying the pieces of the injection through the drying and melting steps, the chip rhythm is extruded to a diameter of about 5mm by applying an appropriate pressure, and the length is about 5mm. The present invention provides a method for processing recycled raw materials for producing polyethylene pipes for cutting and re-producing polyethylene pipes by injection molding.

According to the present invention, a method for processing a recycled raw material for producing polyethylene pipe, the first step; Shredding various synthetic resin products such as plastic bottles or polyethylene containers 81 and cutting pieces A so as to have a size of about 2-3 cm; A second step; Washing the crushed synthetic resin pieces (A) through the washing machine 200 to remove foreign substances; A third step; Putting the washed synthetic resin pieces (A) through a dehydrator (100) so that the weight ratio of water and synthetic resin pieces (A) is 10: 1, followed by dehydration; Step 4; Applying temperature of 60-80 ° C. using warm air and drying for 30-50 minutes; The fifth step; The dried synthetic resin piece (A) is subjected to a temperature of 180-270 ° C., melted and extruded, while being pulled out to a size of 3.5-6 mm to form a chopstick 84; Sixth step; The extruded chip chop 84 is cut into 4-6 mm in length to produce a chip 85 in the form of; Seventh step; Cooling the manufactured chip to complete the chip of the injection raw material; to complete the synthetic resin chip 85 to produce a polyethylene pipe.

In addition, according to the present invention the raw material processing method for producing polyethylene pipe, the third step of the dehydration step, by rotating the rotation of the rotating body to RPM 800 to dehydrate, repeating three times at 30-40 seconds intervals to proceed with dehydration The dehydrator of the third stage includes a water drainage space part 11 and a housing 10 formed by cutting a rotary shaft 21 that divides the center of the space part of the empty housing 10 and a center outer peripheral surface of the housing 10. A) a gas housing (10) having an inlet (12) and an outlet (13) installed in upper left and right ends thereof; A plurality of impact bars 18 horizontally blocking the water draining space 11 of the housing 10 and fastened perpendicularly to the rotational direction of the rotation shaft 21; Is fastened to the rotary shaft 21, the rotary wing 22 is formed to be fastened 180 degrees apart in the direction away from the center of the rotary shaft 21 is formed, one side of the rotary wing 22 is formed on the center line of the rotary shaft 21 Rotating body 20 is formed to be tapered to have an angle of 2-18 ° compared to; And a perforated membrane 30 installed around the outer circumferential surface to include all of the outer circumferential surface of the housing 10, that is, the water drainage space portion 11. The piece A is transferred to the inside of the housing 10 through the inlet 12, and the rotating body 20 rotates through the rotating shaft 21 so that the rotary wing 22 is directed toward the strike bar 18. (A) by hitting to remove moisture more easily: the rotating body 20, by tightening the blow block 40 for hitting the end of the tapered surface of the rotary wing 22 having a constant angle at a 90 ° angle Increase the effect of the blow.

In addition, the cooling step of the seventh step according to the recycled raw material processing method for producing polyethylene pipe of the present invention is cooled for 30-50 minutes at a temperature of 20-25 ° C. by air cooling.

According to the present invention, there is a great advantage in that it is possible to melt a synthetic resin product, such as a plastic bottle or polyethylene container, which is generally discarded after being used, and then to produce the polyethylene pipe again.

According to the present invention, it is possible to manufacture a pipe of high hardness through the re-production, while also meeting the recycling of resources, can be produced at a low cost, there is a great advantage in that the quality of the pipe can be improved.

According to the present invention, the content of impurities is low to produce synthetic resin chips after the water is removed through the dehydrator, and in particular, in the case of the chip produced by dehydration using the dehydrator and the dehydration method of the present invention, the ash content is low, thereby producing again. There is an advantage in that the quality of the pipe being improved can be improved.

1 is a view showing a step of regenerating the plastic bottle or polyethylene container of the present commonly used plastic chip,
Figure 2 is a view showing a washing machine and a dehydrator for washing and dewatering the pieces for the production method of the present invention,
Figure 3 is a perspective view of the dehydrator of the present invention,
4 is a cross-sectional view of the dehydrator of the present invention according to the present invention;
Figure 5 is a view showing a side cross-sectional state of the dehydrator of the present invention.

The present invention relates to a chip manufacturing method for crushing a synthetic resin product once used to produce the polyethylene pipe. Therefore, the structure of the present invention and its operation will be described in detail with reference to the drawings.

First, the present invention, the first step; Various synthetic resin products such as plastic bottles or polyethylene containers 81 are crushed and the pieces A are made to have a size of about 2-3 cm. Prior to description, reference numerals of FIG. 1 are used as they are for explanation of general technology. In the case of sculpture only, the reference numeral 82 is used in FIG. 1 which is a general prior art drawing. And Figures 2 to 5 illustrating the present invention reveals that all put a separate reference numeral "A".

A plastic bottle or a plastic product such as a polyethylene container 81 is shredded into a crusher. This shredder is already used in many forms, with the sharp shredding blades rotating, tearing and shredding the appearance of plastic products such as plastic bottles or polyethylene containers 81. At this time, if the important work is torn too finely to produce debris, the debris is discarded, and it is desirable to be broken in the form of a suitable piece.

At this time, the applicant of the present invention produced a variety of chips 85 through a number of experiments, as a result, the size of the synthetic resin piece 82 was about 2-3cm. Even when the washing and dehydration processes are performed afterwards, the pieces of too small size are difficult to carry out the dewatering process, and it is difficult to wash them. Therefore, in accordance with the rule of thumb, the size of the piece (A) is proposed to the size of 2-3cm.

Next, the present invention provides a method for manufacturing a semiconductor device, The shredded synthetic resin pieces (A) are washed through the washing machine 200 to remove foreign substances. In the case of the washer 200 is shown in Figure 2 of the present invention, it is preferred that a general washer 200 is used. In the case of the synthetic resin chip 85, the buoyancy is small so that it does not subside in water. In the case of powder, debris, and impurities, there are things that float in water. This is removed and agitated to remove the contaminants that cling to the outer surface of the piece of synthetic resin (A). It is very clean. Herein, the synthetic resin fragments (A) refer to fragments obtained by breaking polyethylene containers into pieces.

Next, the present invention is a third step; After washing the synthetic resin piece (A) through the dehydrator 100, the weight ratio of water and synthetic resin pieces (A) is 10: 1, and then undergoes a step of dehydration. As will be described later, the synthetic resin pieces are dehydrated using the dehydrator 100 used in the present invention. Rotating rotating body 20 is to spin the water and the synthetic resin piece 100 while actually dewatering with washing again. Rotating body 20 hits the synthetic resin piece (A) to drop the remaining debris, and complete the washing to completely drain the water.

After this step, the fourth step; The temperature of 60-80 ℃ is applied by using warm air and the drying is performed for 30-50 minutes. It is to dry the water wet to the outer peripheral surface of the synthetic resin pieces (A) dehydrated through the warm air. The temperature is maintained at about 60-80 ° C., preferably for 30-50 minutes.

The reason why dehydration is important is that the synthetic resin piece (A) is not completely drained during the dehydration and drying process, so that if the piece (A) is stuck to some of the pieces, the piece (A) will melt. Oxygen is released when the phenomenon occurs. When producing a synthetic resin product, there is a possibility that the durability will be weakened as it becomes an empty space. After all, this warm air drying method used in the present invention is convenient to use and can keep the drying neat, and desirably dry to achieve the removal of another dust, dust, and impurities that may stick to the pieces (A) at the same time. Is the way. Of course, this is consistent with the object of the present invention to remove ash.

The fifth step; The dried synthetic resin piece (A) is subjected to a temperature of 180-270 ° C., melted and extruded, while being pulled out to a size of 3.5-6 mm and manufactured in the form of a rhythm 84. That is, the resin dried pieces (A) are melted and liquefied. The liquefied synthetic resin piece (A) is pulled out by the extruder, and when cooled, falls out in the form of a rhythm 84, such as long noodles. Melted and introduced into the inside of the mold, and the shape is formed as a result of the cold mold being cured. At this time, the diameter of the rhythm 84 to be extruded is appropriate size of 3.5-6mm. The injection chip 85 of the present invention is a chip 85 for manufacturing a pipe. Therefore, it is preferable that the pipe is manufactured in a size according to the melting temperature of the pipe to be manufactured and the manner of operation. Applicants of the present invention have fabricated pipes using chips 85 many times. At this time, the size of the chip 85 for the fastest and stable injection was about 3.5-6 mm in diameter. In particular, the applicants of the present invention prefer chips with a diameter of 4-5 mm.

Next, the present invention is a sixth step; The extruded chip chop 84 is cut into lengths of 4-6 mm and manufactured in the form of chips 85. In other words, the extrudate, which is extruded in the form of a long rhythm 84, is cut to an appropriate size. An excessively long shape is likely to become a problem in the melting operation when it is made into a pipe through a post-process. Too long chips are difficult to achieve a rapid melting rate, and too small chips 85 are difficult to balance because heat is quickly melted while other parts are not melted. Therefore, the chip 85 of the appropriate size is most preferred, and the chip 85 is cut to 4-6 mm in consideration of the production method of the pipe and the system provided by the applicant of the present invention.

Finally, the present invention comprises a seventh step; Cooling the manufactured chip to complete the chip of the injection material to complete the synthetic resin chip 85 to produce a polyethylene pipe.

In other words, the produced chip 85 is completed through the cooling step.

This cooling step is cooled for 30-50 minutes at the temperature of 20-25 degreeC by the method of air cooling. It is desirable to cool by blowing cold air, and to cool the wind to reduce the temperature of the chip 85 to complete the shape, and to blow off debris or dust that may be stuck to the edge of the cut chip (85). . In general, the cooling method of dropping only the temperature may suck the debris around while the hot chip 85 is cooled, and may absorb impurities to form impurities. Therefore, by blowing the cold air blows the dust that may be stuck to the cold air cooling to maintain the shape.

A more detailed embodiment of the present invention will now be described with reference to the drawings shown.

First, in the dehydration step of the third step of the present invention, while rotating the rotation of the rotating body 20 to RPM 800 to dehydrate, it is preferable to proceed with dehydration by repeating three times at intervals of 30-40 seconds. That is, it is preferable to repeat the conduction three times at regular intervals rather than proceeding the continuous dehydration while rotating at a high speed through the dehydrator 100. This is because dehydration of water after dewatering, then dewatering again and again can produce a safer and neat effect of dehydration. This process of dehydration is very important in the present invention, as shown in Table 1, which analyzes the physical properties of the chip produced by the method of the present invention and the conventional regenerated chip, which will be described later, it is excellent in the quality of the chip produced by the invention It is because of this dehydration process.

Then look at the dehydrator 100 of the third step used in the present invention together with the drawings. In the dehydrator 100 of the present invention, the dewatering space part 11 and the housing 10 formed by cutting the rotary shaft 21 and the outer peripheral surface of the center of the housing 10 which divide the center of the space part of the empty housing 10. ) The gas housing 10 having the inlet 12 and the outlet 13 installed at the upper left and right ends thereof, and horizontally blocking the water drainage space 11 of the housing 10 and rotating the shaft 21. There are a plurality of hitting bar 18 is fastened perpendicularly to the rotation direction, and is fastened to the rotary shaft 21, a rotary wing 22 is formed to be opened 180 degrees apart in the direction away from the center of the rotary shaft 21, One side of the rotary wing 22 has a rotating body 20 is formed to be tapered to have an angle of 2-18 ° compared to the center line of the rotating shaft 21. In addition, the outer peripheral surface of the housing 10, that is, including a perforated membrane 30 is installed around the outer peripheral surface so as to include all the water drop space portion 11, the piece of synthetic resin squeezed moisture through the washing machine 200 (A) is transmitted to the inside of the housing 10 through the inlet 12, the rotating body 20 is rotated through the rotating shaft 21 to rotate the rotary wing 22 toward the striking bar 18 ( It is easier to remove moisture by hitting A).

In addition, the rotating body 20 of the dehydrator of the present invention, by tightening the blow block 40 for hitting the end of the tapered surface of the rotary wing 22 having a predetermined angle at an angle of 90 ° to increase the effect of the blow. desirable.

That is, the dehydrator 100 of the present invention is a dehydrator 100 of a synthetic resin chip manufacturing system for regenerating plastic bottles or polyethylene containers or general synthetic resins. Once a plastic bottle or polyethylene container is made and used, the plastic bottle or polyethylene container must be collected and recycled back to the chip for recycling. This is followed by the step of scrapping the plastic bottle or polyethylene container, washing the pieces to dry, and melting the dried piece of synthetic resin (A). Next, a process of chipping the molten synthetic resin into an appropriate size is added.

After the synthetic resin pieces are washed in the washing machine 200 shown in FIG. 2, they are lifted through the screw and introduced into the inlet 12 of the dehydrator 100. The synthetic resin piece A is dropped together with water into the inside of the housing 10, and the perforated network 30 forming the outside of the housing 10 has many voids formed therein. Therefore, water is discharged to the hole of the perforated network 30 and only the synthetic resin piece A remains inside the housing 10. At this time, the synthetic resin piece (A) is in a state containing a large amount of water. In order to remove this moisture, the rotating shaft 21 rotates to rotate the rotating body 20. This rotating body 20 is manufactured in a form different from that of the conventional one, as shown in Figs. The rotating body 20 is fastened about the rotating shaft 21, but has a side with an angle of about 2-18 ° in a line crossing the center point of the rotating shaft 21. The reason for this angle is that the oblique tapered surface of the rotating body 20 is always rotated to strike the synthetic resin piece A to impact in the rising direction. That is, since the rotary wing 22 of the rotating body 20 that rotates by centrifugal force is fastened in a state of 2-18 °, which is a slight angle, when it collides with the fragment A, the synthetic resin fragment A naturally occurs. It is popping outward. Of course, since the perforated membrane 30 surrounding the outer surface of the housing 10 is formed in the outward direction, it hits the perforated membrane 30 and shakes off moisture. The reason why this operation is important is that the rotary wing 22 of the rotor 20 always collides with the synthetic resin piece A to form a secondary collision with the perforated membrane 30.

Furthermore, in the present invention, before wrapping the periphery of the water drainage space 11 formed in the housing 10 with the perforation membrane 30, a blow bar 18 for blocking a part of the water drainage space 11 is blocked. Install at an angle. The striking bar 18 is mounted to form an outer surface of the housing 10 in the direction of the rotation shaft 21, the striking bar 18 is a piece of synthetic resin (A) hit by the rotation of the rotary wing (22) ) Has a second impact so that you can receive a greater amount of impact. Compared to the synthetic resin piece A hitting the perforated membrane 30, four or six or more are mounted and used to deliver a larger amount of impact so as to remove moisture more quickly. Draining water through the dripping space 11 does not interfere, but is mounted in a number capable of maintaining a larger secondary collision with the synthetic resin fragments A carried by the collision.

Due to the strong collision with the rotary wing 22, the moisture accumulated in the synthetic resin piece A is first shaken off, and the synthetic resin has a strong kinetic energy through the collision and strikes the perforated membrane 30 or the striking bar 18. Piece (A) is again to shake off the moisture and complete the drying.

If the moisture in the synthetic resin piece (A) washed in this manner, it can be more effectively chipped during the post-treatment melting process. Piece of synthetic resin (A) containing a lot of water is difficult to melt, but it is difficult to produce a high quality recycled resin chip because there is a lot of impurities to be contained therein. Therefore, the dehydrator 100 of the present invention has the advantage that solved this problem. Next look at a more specific embodiment of the present invention.

As shown in the figure, the rotating body 20 of the present invention, by tightening the blow block 40 for the blow to the end of the tapered surface of the rotary wing 22 having a predetermined angle at an angle of 90 ° to increase the effect of the blow Let's do it. This embodiment is a method of engaging the hitting block 40, which can more surely the effect of the above-described hitting. At the end of the rotary wing 22 is to fasten the blow block 40 to cause friction with the piece (A). The hitting block 40 is fastened at an angle of 90 degrees to hit the synthetic resin piece A with a large area on the tapered surface top of the rotary wing 22. The hitting block 40 is rotated while generating a greater wind at the top of the rotary wing 22, hitting the synthetic resin pieces (A) with a larger area to shake off moisture.

In addition, in the present invention, the side of the housing 10, the impact panel 40 protruding from the side of the outlet side is attached to improve the friction with the synthetic resin piece (A). In the present invention, the rotating shaft 21 of the housing 10 rotates in one direction, and pulls out the synthetic resin piece A obtained through the inlet 13 to the outlet 13 in the other direction. At this time, the side plate of the discharge port 13 side housing 10 also forms a striking panel 40 such as a plurality of diaphragms protruding from the inside. The striking panel 40 generates friction with the synthetic resin piece A blown by the rotary wing 22 and serves to remove moisture. The striking panel 40 is not limited to a special fastening position, it is preferable to protrude in accordance with the direction in which the synthetic resin piece (A) springs up when the rotary wing 22 rotates to hit the piece (A). As in the embodiment of the present invention, it is most preferable to radially mount the central axis on the side of the circular housing 10.

In addition, the outlet 13 protruding to the upper end of the housing 10 of the present invention, the hopper-type discharge pipe 50 of the upper and lower light cross section so that the piece (A) can be delivered to the fusion splicer through the discharge pipe 50 by the impact. To form. As shown in FIG. 3, a wide bottom and a narrow top of the discharge pipe 50 are formed in the discharge port 13 so that a larger amount of dried chips can be discharged to an external hose. Of course, the synthetic resin piece (A) hit the inner circumferential surface of the discharge pipe 50 forming the upper side because the upper side is narrow may be once again removed moisture and discharged to the hose. It is advantageous to increase the effect of the present invention by fastening the discharge pipe 50 of the upper and lower light to the discharge port 13 and pulling it out with the melter.

In addition, the discharge port 13 according to the present invention, it is preferable to combine the suction fan 60 to pull out the synthetic resin pieces (A) inside the housing (10). In order to remove the synthetic resin pieces (A) dried at a high speed is to install the suction fan 60 to the hose communicating with the outlet (13). If hot air is generated in the suction fan 60, the synthetic resin pieces A can be dried even through the temperature, thereby increasing the effect. Next, in the present invention, an injection nozzle 70 for supplying water is formed at one side of the inlet 12 of the housing 10 or the inlet 12 of the housing 10 to form the synthetic resin piece A once again. It is preferable to wash. In FIG. 7, a separate injection nozzle 70 may be mounted on a portion shown by a dotted line to secondly wash the pieces of synthetic resin that have passed through the washer 200. Injecting the washing water through the injection nozzle 70 for a while when the rotary shaft 21 is rotated by being injected through the inlet 13, the cleaning can be secondarily completed to obtain a clean piece of synthetic resin (A). Then, when the injection nozzle 70 of the present invention is turned off and the dehydrator 100 is operated, it is possible to completely remove moisture to regenerate a higher quality synthetic chip.

At this time, the injection nozzle 70 is preferably mounted in the front portion of the inlet 12 and the housing 10. It is advantageous that the injection nozzle 70 is mounted close to the inlet 12 because the synthetic chip which rotates and exits to the outlet 13 must enter the melter in a dried state.

Then, the analysis table analyzing the physical properties and components of the chip manufactured by the chip manufacturing method of the present invention and the chip produced by the conventional method will be described.

Comparison Table of Existing Products and Renewed Raw Materials of the Invention

Test Items Reference value Foreign substance Foreign substance This is invention This is invention Impurity test Ash ratio General recycled raw materials (more than 0.7% ash)
Ash 0.7% or less 0.25% or less Ash 0.1% or less Appearance and Dimension KSC 8455 × ○ ○ ◎ Compression test KSC 8455 × × ○ ◎ Tensile test 2.2KN or more × △ 2.2KN or more 2.5KN or more Elongation test More than 300% × × 330% or more More than 380% Impact strength test 11KJ / m ² × × ○ ○ Specific gravity test 0.941-0.965 0.956 0.954 0.954 0.951-0.955 Low pressure test? KSC 8455 × ○ ○ ○ Batch test Less than 1% 0.6-1.5 ○ 0.25% or less 0.1% or less Melt mass flow index 6.0 g / 10min 0.6-1.0 0.5 0.35 or less 0.25% or less Low temperature shock test KSC 8455 × × ○ ◎ Chemical Resistance Test KSC 8455 ○ ○ ○ ○ Fusion test KSC 8455 × × ○ ○

10; A housing 11; Drowning space
12; Inlet 13; outlet
18; Blow bar 20; Rotating body
21; Axis of rotation 22; Spinning wing
30; Perforated membrane 40; Blow Block

Claims (5)

A first step; Polyethylene container (81) or polyethylene Crushing the synthetic resin product to produce a piece (A) so that the size is 2-3cm; A second step; Washing the crushed synthetic resin pieces (A) through the washing machine 200 to remove foreign substances; A third step; After washing the washed piece of synthetic resin (A) through the dehydrator 100, the weight ratio of water and the piece of synthetic resin (A) is 10: 1, and then rotating the rotating body 20 of the dehydrator (100) to RPM 800 Dehydration by rotating to spin, but dehydration by repeating three times at intervals of 30-40 seconds; Step 4; Applying temperature of 60-80 ° C. using warm air and drying for 30-50 minutes; The fifth step; The dried synthetic resin piece (A) is prepared by applying a temperature of 180-270 ° C., melting and extruding it, in the form of a rhythm 84 having a diameter of 3.5-6 mm; Sixth step; The extruded chip chop 84 is cut into 4-6 mm in length to produce a chip 85 in the form of; Seventh step; Cooling the prepared chip, but the step of cooling to cool for 30-50 minutes at a temperature of 20-25 ℃ by the method of air cooling; to complete the synthetic resin chip 85 to produce a polyethylene pipe;
The dehydrator of the third step, the water drop space portion 11 and the housing 10 formed by cutting the rotary shaft 21 and the outer peripheral surface of the center of the center of the space portion of the empty housing 10 inside the housing 10 A gas housing 10 provided with an inlet 12 and an outlet 13 at upper left and right ends thereof; A plurality of impact bars 18 horizontally blocking the water draining space 11 of the housing 10 and fastened perpendicularly to the rotational direction of the rotation shaft 21; Is fastened to the rotary shaft 21, the rotary wing 22 is formed to be fastened 180 degrees apart in the direction away from the center of the rotary shaft 21 is formed, one side of the rotary wing 22 is formed on the center line of the rotary shaft 21 Rotating body 20 is formed to be tapered to have an angle of 2-18 ° compared to; And a perforated membrane 30 installed around the outer circumferential surface to include all of the outer circumferential surface of the housing 10, that is, the water drainage space part 11. A) is transmitted to the inside of the housing 10 through the inlet 12, the rotating body 20 is rotated through the rotating shaft 21 so that the rotary wing 22 is directed toward the striking bar 18 (A). Process of recycling raw material for the production of polyethylene pipes, characterized in that to remove moisture more easily by hitting).
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