KR20050048359A - Method of producing recycle synthetic resin pellet from thermoplastic waste and plant therefor - Google Patents

Abstract

In the present invention, the selected thermoplastic wastes are passed through an extruder to be fluidized near the melting point, and formed into a cylindrical bar shape by removing impurities such as cosmetic melts through a strainer installed at the discharge end of the extruder, and then the molten impurities are removed. The present invention relates to a regenerated synthetic resin pellet manufacturing method and apparatus for crystallizing the synthetic resin in a rapid heating and reheating process. In particular, the present invention provides a method and a manufacturing equipment for regenerated synthetic resin raw material pellet which adopts a method of installing a forced suction vacuum pump in the extruder, coupling and installing a strainer at the rear end of the extruder, and heating and drying the molded product in a movable structure. It is characterized by the fact that forcibly discharging impurities or moisture in the gaseous state lower than the synthetic resin, and remove the unmelted material by a separate strainer, shortens the crystallization time and recycled synthetic resin pellets at the same time It is not only to prevent containing, but also to prevent diffusion bonding to each other in the atmosphere, and to improve the crystallization unit to moveable structure to solve the problem of the layout due to the limitation of the installation area regenerated synthetic resin that can produce high-quality regenerated resin pellets Pellet production method and manufacturing equipment are provided.

Description

Method for producing recycled synthetic resin pellets using thermoplastic waste and its manufacturing facilities {Method Of Producing Recycle Synthetic Resin Pellet From Thermoplastic Waste And Plant therefor}

The present invention relates to a method for producing regenerated synthetic resin pellets using a specific selected thermoplastic waste and to a manufacturing apparatus thereof, and more particularly, to pass the selected thermoplastic waste through an extruder to fluidize near the melting point, the discharge end of the extruder Regenerated synthetic resin pellets are manufactured by passing through a molding machine including a strainer installed in the mold and extruding them by forming a cylindrical bar while removing impurities such as cosmetic melts, and crystallizing the molten synthetic resin from which the impurities have been removed by rapid transfer in air and reheating. It relates to a method and a manufacturing apparatus.

For a long time, countries such as Korea, where resources are scarce, have been interested in how to recycle resources or facilities, and have continuously developed regeneration facilities and methods. This concept of regeneration has been evaluated to solve not only energy shortage problems but also environmental problems.

In particular, raw materials of various thermoplastic synthetic resin products including plastics such as PVC (Polyvinyl chloride), PVA (Polyvinyl alcohol), PET (Poly Ethylene Terephthalate), nylon (Nylon), PBT, PC, PCB (Polychlorinated biphenyl), etc. In order to regenerate the recycled synthetic resin pellets, a homogeneous waste synthetic resin, which is a raw material, was added to a suitable melting temperature for each phase, cooled again, and cut into suitable sizes.

Regenerated synthetic resin pellet production equipment used in the prior art, as shown in Figures 1 and 2, the melted synthetic resin pulverized to a predetermined size or less through an extruder 20 'to be fluidized enough to fluidize and melted synthetic resin water cooling equipment (70) It was crystallized by quenching using ') and dried by installing a heating and drying facility (80') to remove moisture contained in the water cooling process.

This conventional water cooling method has a high defect rate such that the molten regenerated synthetic resin is quenched in a hot state and the molecular ring of the regenerated synthetic resin pellet is broken, making it unsuitable for use as a raw material for making synthetic resin products. There was a problem of drying about 10 hours in time.

In addition, in order to solve the environmental problems associated with water cooling treatment, the production cost of pellets increased due to the burden of securing a wastewater treatment facility and additionally installing a heating and drying facility. There is a problem that it is not cheaper than the raw material cost.

The pulverized waste synthetic resin is introduced into the hopper 10 'and a screw is mounted at the bottom thereof to be supplied to the extrusion molding machine 20', and the waste synthetic resin is fluidized near the melting point using the high temperature heat obtained through the heat generator. After passing through an extruder 20 ', which is extruded and molded into a specific shape, for example, an elongated round rod shape, water is cooled and cured by spraying cooling water on the rough molding of the extruder using a cooling water supply device 70', The cutter 50 'is cut into a predetermined size and discharged in pellet form, and the pellet is passed through a heat dryer 80' to obtain a recycled synthetic resin pellet raw material. However, in the pulverized waste resin screening process, it is difficult to select only homogeneous waste synthetic resins, and PVC, PVA, nylon, PBT, PC, PET, etc. constituting the thermoplastic waste have softening temperature and melting temperature of each of these properties. Although different from each other, conventionally applying a predetermined heat from the outside of the extruder, but does not have a separate removal equipment is not sufficiently melted for each feature in the extruder, and part of the extrusion process remains in the unmelted state of high quality recovery There were significant difficulties in obtaining the resin pellets.

In addition, the conventional extruder does not separately process the gas and water vapor generated during the molding extrusion process again contained in the molding or the expensive extruder also occurred.

The present invention has been made to solve the problems of the prior art, by installing a forced suction vacuum pump in the extruder forcibly venting gas or water vapor (Vent) to forcibly remove impurities or moisture in the gas state lower than the synthetic resin Drain it,

Combining and installing a strainer at the rear end of the extruder to extrude by molding into a desired round rod shape while removing the material of the unmelted state having a higher melting point than the recycled synthetic resin to be produced,

By abandoning the water-cooled crystallization method, which is a quenching method, and crystallizing by repeatedly heating the molding while rapidly transferring the molding, it shortens the crystallization time and prevents the recycled synthetic resin pellets from containing moisture in the air and diffuses each other in the air. Prevent from joining,

It is an object of the present invention to provide a method and a production facility for regenerated synthetic resin pellets that can produce high-quality regenerated synthetic resin pellets by solving the problem of disposition due to the limitation of the installation area by improving the crystallization unit to a movable structure.

In order to achieve the above object, the present invention provides a forced suction vacuum pump in the extruder, combines and installs a molding machine including a strainer at the rear end of the extruder, and adopts a method of heating and drying while rapidly conveying the molding to a movable structure It is characterized by a method for producing regenerated synthetic resin raw material pellets and manufacturing equipment.

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

3 and 4 are for explaining the concept of a method for producing a recycled synthetic resin raw material pellets according to the present invention, Figure 3 is a flow chart of the production equipment of the recycled synthetic resin raw material pellets using the thermoplastic waste according to the present invention, 4 is a manufacturing process chart of the recycled synthetic resin raw material pellet using the thermoplastic waste according to the present invention.

According to the present invention, the thermoplastic waste 1a of the illustrated embodiment is introduced into the hopper 10 and the injected waste is introduced into the extruder 20 through the screw 11 installed at the outlet of the hopper 10. Waste input process; Heat-melting process for melt extrusion of the thermoplastic wastes introduced through the extruder 20, in which the extrusion screws 22 and 23 are installed inside and the heat generator 21 is installed at the outside by a temperature controller. and; An impurity removal and molding extrusion process of removing the cosmetic melt through the strainer and the molding machine 30 installed at the extruder discharge end and molding the molten extrudate into a cylindrical bar shape and extruding it; Receiving the discharged molten extrusion molded product (1c) by using a chain-type belt conveyor 41 installed therein and rapidly transported, while using a chamber-type heat generator 42 installed at a predetermined interval on the chain belt belt conveyor 41 Drying and crystallizing the molded article 1c discharged step by step and at a predetermined interval; The crystallized molded product 1d is cut into pellets by using a pelletizer provided with a cutter 51 therein, and a cutting process or a pelletizing process is used as a basic configuration.

The present invention to improve the structure of the extruder and the crystallization unit in the basic configuration,

A suction vacuum pump 26 is installed in the vent line 25 outside the extruder 20 to remove impurity gas and moisture,

The crystallization unit 40 of the crystallization process is provided at regular intervals and alternately undergoes a heat drying step and an air cooling step by means of a heat generating device mounted in a heat drying chamber, and preferably, the regeneration synthetic resin is melted at the initial heat drying step. The heating is somewhat higher, and the final air cooling step is characterized by forced cooling by forced blowing.

Looking at this in more detail according to an embodiment of the present invention,

In the extruder 20, softening points of PVC, PVA, PBT, PC, nylon, PET, etc., which constitute thermoplastic wastes, to provide a melting temperature for each material suitable for molding so as to recycle raw materials selected by properties. Heat it to different temperature according to Point and Melting Point.

For the sake of explanation, a case of regenerating PET, nylon, PBT, and PC resin as an embodiment of the present invention will be described. Usually, the extruder 20 is heated from 250 ° C. to about 280 ° C., at which time the generated gas and water vapor having a low melting point are discharged into the atmosphere by various types of suction vacuum pumps 26.

In addition, the high melting point unmelted material is filtered through a strainer 30 having a mesh that can filter from a minimum of 80 mesh to a maximum of 120 mesh.

The temperature of the molded product 1c discharged through the strainer and the molding machine 30 is usually about 280 ° C. This molded product 1c is introduced into the crystallization unit 40. In the crystallization unit 40, a heat retention chamber 42 having a heat generating device is installed spaced apart in a molding direction, and preferably, a temperature sensor is attached therein to control the heating temperature differently for each heat retention chamber. You may. In addition, a variety of conveying equipment can be used to rapidly convey the molding in the hot state when heated in each chamber, but it is preferable to use a chain belt belt conveyor that is easy to withstand heat and has good ventilation. Adopting chain belt belt conveyor, rapid transfer and heating by heat generator enables drying and crystallization without melting again even when it is higher than melting point.

In one embodiment of the present invention, in the first heat retention chamber, the temperature is slightly higher than the melting temperature in order to shorten the crystallization time of the regenerative synthetic resin. In the case of the regenerated PET resin, the heat is rapidly transferred between 350 ° C and 380 ° C. From a 2nd thermoretention chamber, it heats about 250 degreeC to about 200 degreeC.

The conveyed molding is air cooled in a natural state in the section between the front heat retention chamber 42 and the rear heat retention chamber 42, but the final air cooling section may be forcedly blown and cooled by introducing a forced blow fan 44.

In addition, the crystallization unit may be performed by dividing a plurality of sets into two units by using a heating process and a cooling process in one set in consideration of the installation area. Attach the wheels to the structure so that they can be moved if necessary.

The resynthetic resin molded product 1d discharged through the crystallization unit is cut and pelletized by a cutter 51 rotating at a predetermined time interval, and then transferred to a storage tank by a conveying conveyor belt 60.

5 is a plan view of a recycled synthetic resin raw material pellet manufacturing facility according to an embodiment of the present invention, Figure 6 is a front view of a recycled synthetic resin raw material pellet manufacturing facility according to an embodiment of the present invention. In one embodiment of the present invention, the crystallization unit is divided into two facilities and installed as a production facility that implements the above-described regenerated synthetic resin pellet manufacturing method.

The present invention described above includes a screw (11) installed at the hopper (10) into which the sorted thermoplastic waste (1a) is introduced and the outlet of the hopper (10) for introducing the injected waste into the extruder (20);

In order to melt-extrude the injected thermoplastic waste, extrusion screw 22 and 23 are installed inside, and extruder 20 and heat extrusion apparatus are provided with a heat generator 21 which is controlled to a specific temperature by a temperature controller. A molding machine 30 including a strainer installed at the discharge end of the extruder 20 for removing the cosmetic melt from the water and molding and discharging the molten extrudate into a cylindrical bar shape;

Generation of heat in the form of a heat retention chamber installed on the chain net belt conveyor 41 and the chain net belt conveyor 41 installed therein for rapid crystallization while receiving the discharged molten extrusion molded product 1c. A crystallization unit comprising an apparatus 42;

A recycled synthetic resin raw material pellet manufacturing facility including a pelletizer having a cutter 51 installed therein for cutting and discharging the crystallized molded product 1d into pellets is a basic configuration.

The present invention to improve the structure of the extruder and the crystallization unit in the basic configuration,

A suction vacuum pump 26 is installed in the vent line 25 outside the extruder 20, and the transfer equipment installed in the crystallization unit is a chain belt belt conveyor, and the molding injected into the crystallization unit is heated and dried on the chain belt belt conveyor. It characterized in that the heat-drying heat retention chamber is built in the heat generating device installed in the crystallization unit 40 at regular intervals to alternately pass through the step and the air cooling step, preferably in the first heat drying step the regeneration synthetic resin at its melting point The heating is somewhat higher, and the final air cooling step is characterized by forced cooling by forced blowing. In particular, in this embodiment, as shown in Fig. 5 and 6, the crystallization unit is divided into two installations, and each installation is equipped with a heat retention chamber and a chain belt conveyor in one structure, and a wheel is attached to the bottom thereof. .

The above-described embodiment is the best aspect the inventor proposes to practice the present invention. However, it will be apparent to those skilled in the art that modifications or changes may be made in another way to optimize. Therefore, it should not be construed as limited by the above disclosure but should be construed to include such obvious changes described above, and should be construed as limited only to the spirit and scope of the following claims.

As described above, the present invention can not only forcibly discharge gas and water vapor generated in the molten state of the regenerative synthetic resin, but also remove impurities that are not melted, and adopt the heat-drying method. It can prevent the deformation of the structure, and it is possible to implement various arrangements of the equipment even in a small installation area,

 It suppresses the diffusion bonding between recycled resin pellets and reduces the water absorption in the air, thereby making it possible to produce cheap and high quality recycled resin pellets.

Environmental problems such as waste water treatment generated in the conventional water-cooling facility, and can reduce the cost and time of re-drying, there is an advantage that can reduce the pellet cost.

1 is a flow chart of a manufacturing facility for regenerated synthetic resin raw material pellets using a conventional thermoplastic waste.

Figure 2 is a production process of the synthetic resin raw material pellets using the conventional thermoplastic waste.

Figure 3 is a flow chart of the production facility of the recycled synthetic resin raw material pellets using the thermoplastic waste according to the present invention.

Figure 4 is a flow chart of the production process of the recycled synthetic resin raw material pellet using the thermoplastic waste according to the present invention.

Figure 5 is a plan view of a recycled synthetic resin raw material pellet manufacturing equipment according to an embodiment of the present invention.

Figure 6 is a front view of the recycled synthetic resin raw material pellet manufacturing equipment according to an embodiment of the present invention.

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

1a: thermoplastic waste piece 1e: recycled synthetic resin pellet

10: Hopper 11: Screw Feeder

20: melt extruder 25: vent line

26: suction vacuum pump

30: strainer and forming machine

40: Recrystallizing Unit

41: Chain Belt Conveyor

42: thermal retention chamber 43: cooling fan (Cooling Fan)

50: Pelletizer 51: Cutter

Claims (11)

In the method for producing recycled resin pellets, A thermoplastic waste input process of introducing the sorted thermoplastic waste 1a into the hopper 10 and introducing the injected waste into the extruder 20 through a screw 11 installed at an outlet of the hopper 10; Extrusion screws 22 and 23 are installed inside and melt extruded into the molten extrudate the thermoplastic waste introduced through the extruder 20, which is provided with a heat generator 21, which is controlled to a specific temperature by a temperature controller. Heating and melting step; The molten extrudate is molded into a cylindrical bar shape while removing the cosmetic melt from the molten extrudate through a molding machine 30 including a strainer installed at the discharge end of the extruder 20 to form one or more circular bar moldings. A molding extrusion step of extruding with (1c); Receiving the extruded molding (1c) and transported using a transport conveyor 41 installed therein, the molding (using a heat generating device 42 installed on the transport conveyor 41 and mounted in the heat retention chamber ( A crystallization step of crystallizing by heating 1c); Regeneration characterized in that it comprises a pelletizing process for cutting the molded product (1d) crystallized through the crystallization process into pellet (1e) by using a pelletizer 50 installed inside the cutter 51 Synthetic resin raw material pellet manufacturing method. The regenerated synthetic resin pellets as claimed in claim 1, further comprising a step of installing a suction vacuum pump 26 in a vent line 25 outside the extruder 20 to remove gaseous impurities and moisture in the heating melting process. Manufacturing method. The method for producing recycled synthetic resin pellets according to claim 1, wherein the crystallization step is conveyed at a high speed such that the molding (1c) is crystallized without melting by the transfer conveyor (41). 4. The method of claim 3, wherein the crystallization process alternately undergoes one or more heating and air cooling steps by the heat generating device disposed at regular intervals during the transfer of the molding (1c). . 5. The method of claim 4, wherein the initial heating step heats the regenerated synthetic resin somewhat higher than its melting point and the final air cooling step is forced cooling by forced blowing. In the recycled synthetic resin pellet manufacturing equipment using the manufacturing method of claim 1, A hopper (10) into which the sorted thermoplastic waste (1a) is introduced and a screw (11) installed at an outlet of the hopper (10) to feed the introduced thermoplastic waste into the extruder (20); In order to melt-extrude the injected thermoplastic waste into a molten extrudate, extrusion screws 22 and 23 are installed therein, and an extruder 20 having a heat generator 21 that is controlled to a specific temperature by a temperature controller. And a strainer installed at the discharge end of the extruder 20 for extruding the molten extrudate into one or more moldings 1c while removing the melt from the melt extrudate and extruding the molten extrudate into a cylindrical bar shape. Molded molding machine 30; In order to crystallize while receiving the discharged melt extrusion molding (1c) discharged to the pelletizer 50, the heat installed on the transfer facility 41 and the transfer facility 41 disposed in the outlet of the molding machine 30 A crystallization unit 40 including a thermal residence chamber 42 equipped with a generator; Regenerated synthetic resin, characterized in that it comprises a pelletizer 50 is installed inside the cutter 51 for cutting the crystallized molding (1d) discharged from the crystallization unit 40 and discharged in pellet form (1e) Pellet manufacturing equipment. 7. The reclaimed synthetic resin pellets manufacturing facility according to claim 6, wherein a suction vacuum pump (26) is further installed in the vent line (25) outside the extruder (20). 7. The reclaimed resin pellets manufacturing facility according to claim 6, wherein the transport facility (41) installed in the crystallization unit (40) is of a chain belt conveyor type. According to claim 6, One or more heat generation spaced at regular intervals in the crystallization unit 40 so that the molding (1c) introduced into the crystallization unit 40 alternately goes through the heating step and the air cooling step on the transfer facility Regenerated synthetic resin pellets manufacturing facility characterized by at least one heating thermofluid chamber (42) each having a device built-in. 10. The regeneration according to claim 9, wherein the heat generating device in the first heating thermofluid chamber 42 heats the regenerative synthetic resin slightly higher than its melting point, and installs a cooling fan 43 in the final air cooling section to force cooling. Synthetic resin pellet manufacturing equipment. 10. The method according to claim 9, wherein the crystallization unit 40 is divided into two or more units, and at least one of the thermal residence chambers 42 and the transfer unit 41 is installed in one structure for each of the units. Recycling synthetic resin pellets manufacturing equipment, characterized in that the wheel is attached to the bottom of the structure is movable.