KR20010102860A - The automatically regenerated apparatus of polystyrene plastic foam and the method thereof - Google Patents

Abstract

The present invention relates to an apparatus and method for automatically recycling waste foamed polystyrene (styrofoam) into a pellet state by pulverizing, melting and extruding by a continuous process, and more particularly, recycling waste foamed polystyrene by a continuous recycling process. In the apparatus, the tapered structure is formed on the outlet side of each melt feed screw to generate the maximum frictional heat therein, and a plurality of water and gas outlets are provided so that the melt does not harden by efficient water and gas discharge and the tensile strength of the recycled expanded polystyrene Prevents deterioration and installs the secondary melt feeder at an oblique angle to allow the melt to flow naturally with the secondary melt and at the same time reduce the load on the drive to extend the life of the drive. Regeneration unit for remelting defective foamed polystyrene in a simple process The present invention relates to an automatic regeneration device and method for waste foamed polystyrene.

Description

The automatically regenerated apparatus of polystyrene plastic foam and the method

The present invention relates to an apparatus and method for automatically recycling waste foamed polystyrene (styrofoam) into a pellet state by pulverizing, melting and extruding by a continuous process, and more particularly, recycling waste foamed polystyrene by a continuous recycling process. In the apparatus, the tapered structure is formed on the exit side of each melt transfer screw to generate maximum frictional heat therein, and a plurality of water and gas outlets are installed to efficiently melt and melt the molten material by efficient water and gas discharge. Prevents deterioration, installs the secondary melt feeder at an oblique angle, so that the melt flows naturally with the secondary melt, and has a regeneration unit for remelting defective foam polystyrene in the regenerated expanded polystyrene. The present invention relates to an automatic regeneration device and method for waste foamed polystyrene.

In the conventional continuous regeneration process, the waste foamed polystyrene regeneration device has a small area where the screw is rubbed so that frictional heat generated by the friction is generated little, so that the expanded polystyrene is not properly melted and requires a lot of heat from the outside. Since there are few places where water and gas are discharged to the outside, the melt hardens easily due to the moisture content, and the water and gas are contained in the melt, so that the tensile strength of the regenerated expanded polystyrene falls, and the secondary melt feed screw is vertically erected. The primary melt melts quickly into the extruder even before it is melted by friction, so that the melt does not work well, and the poor recycled material has to be re-introduced from the initial process so that the tensile strength is very low due to the deterioration of physical properties. Have problems The.

The present invention is to solve this problem to generate the heat of friction as much as possible to melt the waste expanded polystyrene with a low energy consumption, the melt is not hardened by efficient water and gas removal, and prevent the reduction of tensile strength of the recycled expanded polystyrene, secondary The purpose of this is to smoothly melt by friction during melting, and to maintain the tensile strength in the same state as in the first regeneration by the re-melting process of poor regenerated expanded polystyrene generated during the regeneration process.

In order to achieve this purpose, in the waste foamed polystyrene regeneration apparatus in which a pulverizer, a granule storage tank, a melt transfer machine, a cooling device, a cutter, and a pellet storage tank are installed in sequence, the outlet side of each melt transfer screw is formed in a tapered structure, and melted. The present invention has a feature in that the feeder includes a plurality of gas and water outlets, the secondary melt feeder is installed at an oblique angle, and the regeneration unit is provided at an intermediate position of the primary melt feeder.

1 is a cross-sectional view of an embodiment of the present invention.

2 is an enlarged cross-sectional view of portion "A" of FIG.

3 is a front view of the portion "A" of FIG. 1

4 is a cross-sectional view taken along the line B-B 'of FIG.

5 is a cross-sectional view taken along the line C-C 'of FIG.

<Description of Symbols for Main Parts of Drawings>

Grinder 2, 2 ', 3, 3'. Grinding Roller

4. Feed screw 5. Powder storage tank

6. flat roller 7. uneven roller

8. cutting roller 9. mixing roller

10. Feed Screw 11. Quantitative Control Plate

12. Primary melt transfer machine 13. Screw case

14, 14 '. Primary melt feed screw 15. Regeneration unit

16. Hopper 17. Feed Screw

18. Grinder 19. Metering Plate

20. Exit 21. Secondary melt feeder

22. Secondary melt feed screw 23. Primary moisture and gas outlet

24a, 24b, 24c. Banding Heater 25. 3rd Melt Feed Extruder

26. 3rd melt feed screw 27. 2nd water and gas outlet

28. 3rd water and gas outlet 30. Outlet

31. Chiller 32. Cutter

33. Pellet reservoir 34. Conduit

35. Vacuum pump

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

As shown in Figures 1 to 5, the present invention is a crusher (1), a granule storage tank (5), three melt feeders (12) (21) (25), a cooling device (31), a cutter (32) and It is a waste expanded polystyrene recycling apparatus in which the pellet storage tanks 32 are sequentially installed.

The waste foamed polystyrene flowing into the inlet of the grinder 1 is first crushed by the grinding rollers 2, 2 ', 3, and 3' and then transferred through a transfer screw 4 connected to the lower end of the grinder 1. The primary pulverized product is supplied to the granular material storage tank 5, and the primary pulverized product is compressed and cut at the inlet side of the granular material storage tank 5, and the volume thereof is reduced to about 1/3 of the volume of the waste foamed polystyrene first introduced. A cutting roller 8 composed of a flat roller 6 and a concave-convex roller 7 for reducing the size of the granular material is provided, and the lower part is a mixture for uniformly mixing the granular material and at the same time suppressing the generation of static electricity. The roller 9 is provided.

The lower side wall of the granular material storage tank 5 is provided with a feed screw 10 and a fixed quantity control plate 11 for supplying only a predetermined amount of the granular material to the primary melt feeder 12, and the granular material storage tank 5 The outlet of the primary melt feeder 12 is connected, the primary melt feeder 12 is a screw case 13 and a pair of primary melt feed screw 14 driven by the usual drive means therein. 14 ') is provided. Primary melting of the granular material by frictional heat generated by friction between the screw case 13 and the primary melt transfer screw 14 and 14 'and friction between the primary melt transfer screw 14 and 14'. In order to generate the frictional heat at the same time as mixing the powder, the outlet portion of the primary melt transfer screw 14 (14 ') is tapered with a wider screw axis and a narrower space between the screw blades.

The regeneration unit 15 is provided at an intermediate position of the primary melt feeder 12, and the regeneration unit 15 is composed of a hopper 16, a feed screw 17, and a grinder 18, and a grinder 18. Poor regenerated expanded polystyrene crushed by) is supplied to the hopper 16 by the transfer screw 17 is controlled by a fixed amount control plate 19 installed at the bottom of the hopper 16, the primary melt feeder 12 It is configured to be melted while being injected into the inside and mixed with the powder.

The outer peripheral surface of the outlet 20 side of the primary melt feeder 12 has a banding heater for preheating the primary melt feeder 12 during initial operation and for evaporating water or heating and removing the solidified melt after stopping. 24a), the secondary 20 for secondary melting the primary melt discharged from the pair of primary melt transfer screw 14 (14 ') at the outlet 20 of the primary melt transfer machine 12 The melt feeder 21 is staked out.

The secondary melt feeder 21 is provided with one secondary melt feed screw 22 therein, and as shown in FIGS. 2 and 3, the primary melt feeder 12 and the third melt feed extruder ( At an angle of inclination of approximately 20 to 30 ° between It is formed so as to be connected to give a step, so as to be inclined at an angle so that the primary melt discharged from the primary melt feeder 12 to the secondary melt feed extruder 25 while slowly secondary melting. In addition, it is possible to reduce the load on the conventional drive device for driving the secondary melt transfer screw 22 therein to reduce energy consumption and increase the life of the drive device.

In order to generate frictional heat as much as possible, the secondary melt transfer screw 22 inside is formed in a structure in which the gap between the screw blades is narrowed while the outlet side of the lower portion is tapered, and in the upper portion of the secondary melt transfer machine 21. The primary moisture and gas outlet 23 is formed to discharge moisture and gas to the outside so that the moisture and gas generated during melting are naturally discharged so that the melt does not contain moisture and does not solidify and recycle the inside of the expanded polystyrene. It does not contain moisture and gas to prevent the reduction of tensile strength of regenerated polystyrene. A banding heater 24b is also surrounded on the outer circumferential surface of the lower part of the secondary melt feeder 21.

The secondary melt feed extruder 25 and the third melt feed extruder 25 which are extended are provided with a third melt feed screw 26 therein. The third melt feed screw 26 melts the secondary melt completely. In order to achieve this, the screw shafts are tapered on the middle and the outlet side, respectively, and the spacing of the screw blades is narrow.

Second water and gas outlet 27 is formed in the upper part of the inlet side of the third melt feed extruder 25 to discharge the water and gas secondly, and first through the outlet 30 when restarting after the device is stopped. By re-injecting the solid melt residue of the previous process to be discharged into the outlet to be mixed with the raw material, it serves as a gas and water discharge and residue re-injection.

In addition, a third moisture and gas outlet 28 is provided at the upper part of the rear two thirds of the tertiary melt feed extruder 25 to completely remove the water and the gas, and the third melt feed extruder 25 A banding heater 24c is also surrounded on the entire outer circumferential surface.

A plurality of small holes are drilled in the outlet 30 of the third melt feed extruder 25, and the third melt is extruded into a long thread by an internal pressure, and the cooling device 31 and the cutting machine 32 and Pellet reservoir 33 is provided is cooled through the cooling device 31 and then cut into pellets in the cutter 32, the pellets are sucked into the vacuum pump 35 through the conduit 34 to pellet pellets 33 Save and discharge as much as necessary to the outlet installed under the pellet reservoir (33).

Hereinafter will be described the operation of the present invention.

The granules of waste foamed polystyrene firstly crushed by the mill 1 are compressed and cut by a cutting roller 8 provided on the inlet side of the granules storage tank 5 so that the volume is approximately the volume of the waste foamed polystyrene initially introduced. The granules are reduced to about 1/3, and the granules uniformly mixed by the mixing roller 9 keep the granules having a small specific gravity fixed by the feed screw 10 and the metering plate 11 installed on the outlet side of the lower part. The amount is supplied to the primary melt feeder 12 accurately.

The powder is mixed while being transported by the primary melt feed screw 14 (14 '), the screw case 13 and the primary melt feed screw 14 (14') of the primary melt feeder 12, Due to the frictional heat generated by the friction between two adjacent primary melt transfer screws 14 and 14 'adjacent to each other, the granules are first melted by 70 to 80%, and the volume of waste foamed polystyrene first introduced is approximately 80%. Until reduced. Water and gas generated at this time are discharged through the primary moisture and gas discharge ports 23 formed on the secondary melt feeder 21 and bent on the outer peripheral surface of the outlet 20 side of the primary melt feeder 12. In the initial operation with the heater 24a, the primary melt feeder 12 is preheated and evaporated or heated to remove the solidified melt after shutdown.

The primary melt is sent to the secondary melt feeder 21 through the outlet 20 of the primary melt feeder 12, and when the melt solidifies on the outlet 20 side, it is staked out on the outlet 20 side. The primary melt is scraped off by the blade of the secondary melt feed screw 22, which is slowly mixed down to the lower portion along the secondary melt feeder 21 installed at an angle, and the primary melt is fed to the secondary melt feed screw. The secondary heat is melted by 80 to 95% by the frictional heat caused by the friction of (22). Water and gas generated at this time are discharged through the primary moisture and gas outlet 23 and the secondary moisture and gas outlet 27 formed in the upper part of the inlet of the tertiary melt feed extruder 25. It does not harden because the melt does not contain moisture and does not contain moisture and gas inside the recycled foamed polystyrene to prevent the reduction of tensile strength of the recycled foamed polystyrene. In addition, by the banding heater 24b on the outer circumferential surface of the lower part of the secondary melt feeder 21, the secondary melt feeder 21 is preheated at the time of initial operation, and the solidified melt is removed by heating or evaporating water. Do it.

The secondary melt is completely melted at 99 to 100% by the frictional heat generated by the tertiary melt feed screw 26 while being mixed with the tertiary melt feed extruder 25 and mixed, so that the secondary melt is extruded from the end of the third melt feed extruder 25. It continuously extrudes in a long line through the outlet port 30. Water and gas generated during the third melting are discharged to the outside through the secondary moisture and gas outlet 27 and the third moisture and gas outlet 28, and the banding heaters of the entire outer circumferential surface of the tertiary melt feed extruder 25 ( 24c) preheats the tertiary melt feed extruder 25 during initial operation and evaporates the moisture or heats off the solidified melt after shutdown. The extruded melt is cooled by the cooling device 31 and then cut into pellets in the cutter 32 and stored in the pellet storage tank 33.

The defective regenerated expanded polystyrene generated in the process is introduced into the regeneration unit (5) in order to prevent the deterioration of physical properties (tensile strength) due to repeated regeneration. At this time, the defective expanded polystyrene is remelted while being mixed with the powder of the initial process. Therefore, it is more effective to prevent a decrease in tensile strength than to regenerate only poorly recycled expanded polystyrene, and the process is simple.

In addition, the yield of the regenerated expanded polystyrene by stopping the operation of the regeneration apparatus and injecting the molten residue of the previous process discharged first through the discharge port 30 to the secondary moisture and gas discharge port 27 to be mixed with the raw materials after restarting the operation. Increase

Rotation of the secondary melt feed screw 22 when the primary melt melted in the primary melt feeder 12 is transferred to the third melt feed extruder 25 by the secondary melt feeder 21 as described above. The rate of the melt is controlled by adjusting the speed, because the amount of melt varies depending on the size of the expanded polystyrene. This is because the overpressure is applied to the third melt feed extruder 25 and the extrusion speed is increased, so that continuous extrusion is impossible.

In addition, the feed screw 10 for supplying the powder to the primary melt feeder 12 when adjusting the rotational speed of the secondary melt feed screw 22 also interlocked with the secondary melt feed screw 22 to the primary It is to increase or decrease the amount of powder to be supplied to the melt feeder (12).

Waste foamed polystyrene granules are heated and melted by frictional heat in the primary melt feeder 12 and maintained at a constant speed according to the foaming rate of waste foamed polystyrene by the secondary melt feed screw 22, thereby causing physical properties due to over melting. Since the alteration of is suppressed, the remanufactured products retain almost the same characteristics as the new ones.

As described above, according to the present invention, the waste foamed polystyrene is automatically regenerated in a pellet state by a continuous process to prevent the occurrence of secondary pollution as in the prior art, and the melt is always extruded at a constant extrusion speed, thereby preventing overmelting, thereby making a high quality recycled product. It can be used for a wide range of versatile and generates the frictional heat as much as possible to achieve effective melting without external heat, the melt does not harden by removal of moisture and gas, preventing the reduction of tensile strength of regenerated expanded polystyrene, The remelting process of regenerated expanded polystyrene is simple and has the effect of maintaining the tensile strength as in the first regenerated state.

Claims (2)

In the waste foamed polystyrene automatic regeneration device in which a pulverizer, a granule storage tank, a melt feeder, a cooling device, a cutter, and a pellet storage tank are installed in sequence, the primary melt feeder 12 includes a screw case 13 and a pair of primary melters. The secondary melt feeder (21) and the third melt feed extruder (25) are provided as feed screws (14, 14 '), respectively, and have one secondary melt feed screw (22) and a third melt feed screw ( 25), the pair of primary melt transfer screw 14 (14 ') and the secondary melt transfer screw (22) has a tapered structure at the outlet side in order to generate the frictional heat by friction as much as possible. The third melt transfer screw 26 is formed to have a thicker taper structure in the middle part and the outlet side of the third melt transfer screw 26, and the gap between the screw blades is narrower, and the first melt is narrowed. Poor regenerative foam polis in the middle of air blower 12 The regeneration unit 15 for re-melting the len is provided, and the secondary melt feeder 21 is approximately 20 to 30 ° between the primary melt feeder 12 and the tertiary melt feed extruder 25. At an angle of inclination of " It is addressed while forming a stage in the form of ", the melt does not harden and the primary moisture and gas outlet 23 is formed on the upper part of the secondary melt feeder 21 to prevent the decrease in tensile strength of the regenerated expanded polystyrene. The secondary moisture and gas outlet 27 is formed on the upper part of the inlet of the tertiary melt feed extruder 25, and the tertiary moisture and gas outlet 28 is formed on the rear 2/3 point of the tertiary melt feed extruder 25. Automatic recycling apparatus for waste expanded polystyrene, characterized in that. In the method of automatically recycling waste foamed polystyrene by installing a pulverizer, a powder storage tank, a melt feeder, a cooling device, a cutter, and a pellet storage tank, the primary melt feeder 12 and the tertiary melt feed extruder 25 are Obliquely at an inclination angle of approximately 20 to 30 degrees. "To form a stage in the form of a step to the secondary melt feeder 21, the first melt melt discharged from the primary melt feeder 12 is slowly sent down to the third melt feed extruder 25 while secondary melting And a pair of primary melt feed screws 14 and 14 'in the primary melt feeder 12 and an outlet side of the secondary melt feed screw 22 in the secondary melt feeder 21, respectively. The screw shaft is tapered to form a taper structure and the spacing of the screw is narrowed, and the screw shaft is tapered to the middle part and the outlet side of the tertiary melt feed screw 26 in the third melt feed extruder 25, respectively. The spacing of the screw blades is narrowed to generate the frictional heat by friction as much as possible, so that the melting is effectively performed, and the primary moisture and the gas outlet 23 are formed on the upper part of the secondary melt feeder 21 and the third melted. Secondary water and gas discharge in the upper part of the inlet of the feed extruder 25 (27) to form a tertiary moisture and gas outlet (28) above the rear two-thirds of the tertiary melt feed extruder 25, the moisture and gas is naturally discharged, the melt does not harden and recycled expanded polystyrene It does not contain moisture and gas inside, so it maintains the tensile strength of regenerated polystyrene as the first time, and is equipped with a primary melt feeder 12 intermediate position regenerator 15 to recover poorly regenerated expanded polystyrene. Re-melting while mixing with the automatic recycling method of waste foamed polystyrene, characterized in that to prevent the reduction of physical properties (tensile strength) of poorly recycled expanded polystyrene.