KR20110002539A - Method and apparatus for separating impurities from a resin mixture, and a centrifugal separator used thereto - Google Patents

Abstract

PURPOSE: A method of separating the impurity from the resin mixture, and a centrifugal separator thereof are provided to obtain the thermal plastic resin of high purity with the advantage of economic simple process by inserting the resin mixture into a rotating body. CONSTITUTION: A method of separating the impurity from the resin mixture, and a centrifugal separator(10) thereof comprises a step of forming the fluid resin mixture by heating the resin mixture, a step of inserting the fluid resin mixture into a rotating body(11), and a step of separating the thermal plastic resin and the impurity.

Description

METHOD AND APPARATUS FOR SEPARATING IMPURITIES FROM A RESIN MIXTURE, AND A CENTRIFUGAL SEPARATOR USED THERETO}

The present invention relates to a method and apparatus for separating impurities from a resin mixture comprising one or more thermoplastic resins and impurities, and in particular, a method and apparatus for separating impurities from a mulching film or metal-coated multilayer film laid on arable land. And a centrifuge used herein.

Today, various petrochemical products that use synthetic resin as a main raw material are widely used in a wide range of industries, and accordingly, plastic waste is discharged in large quantities. Such synthetic resin waste pollutes the soil during landfill due to its non-decomposable or decaying nature, and pollutes the atmosphere with the emission of various heavy metals and the generation of toxic gases during incineration. Therefore, there is an urgent need for a method of economically and environmentally friendly recycling of such synthetic resin waste.

Among synthetic resin wastes, mulching films are one of the synthetic resins that are difficult to treat. Mulching films are currently being used on agricultural lands for the purpose of preventing the loss of water in the soil and suppressing the production of weeds. However, since the mulching film is installed on the arable land, a large amount of soil is attached to the mulching film, and the soil is strongly attached to the surface of the mulching film as if it is coated, so it is not easy to remove the dirt from the mulching film.

On the other hand, multilayer films are generally used as food wrappers. This multilayer film is made of thermoplastic resin such as polyethylene terephthalate (PET), polypropylene (PP), polyethylene (PE) and coated on the film for moisture proof and food protection from UV rays. It consists of metal (usually aluminum).

When such a multilayer film is used for packaging of foods, a printing process such as a multi-stage lamination process and gravure printing is performed. Defective products may occur during each lamination or printing process, and most of these defective products are discarded. The discarded multi-layer film is partially recycled without any special treatment, but it is limited to low-grade resin products because PET, PP, PE are mixed in various ratios, and because the coated metal (aluminum) layer is difficult to regenerate and poor in physical properties. have.

SUMMARY OF THE INVENTION The present invention has been made to solve the aforementioned problems of the prior art, and an object thereof is a method and apparatus for easily separating one or two thermoplastic resins and impurities from a resin mixture containing one or more thermoplastic resins and impurities. To provide.

It is also an object of the present invention to provide a centrifuge which easily separates one or more thermoplastic resins and impurities from a resin mixture comprising one or more thermoplastic resins and impurities.

The present inventors have conducted studies to find a method for separating impurities such as soil, pigment, and metal strongly adhered to a thermoplastic resin in a simple and economical manner without using water or a chemical solvent. The present inventors apply fluidity to the resin mixture by heating the resin mixture to a temperature above its melting temperature to below the flash point, and having a fluidity (hereinafter referred to as a "fluent liquid phase resin mixture"). When centrifugation was carried out, it was found that the thermoplastic resin and the impurities are separated.

Soils, pigments, metals and the like, which are the main impurities of the present invention, still maintain a solid phase even at a temperature above the melting point of the thermoplastic resin. Generally, when a thermoplastic resin melts, it becomes a highly viscous liquid. Impurities evenly dispersed in such a highly viscous resin mixture could not be easily separated from the thermoplastic resin and impurities when using the liquid cyclone method, which is a conventional commercially available solid-liquid separation method.

Accordingly, the inventors have found that the thermoplastic resin and the impurities are separated into solid phases by injecting the fluidized bed resin mixture into the rotating body that can rotate at 20,000 rpm or more. The inventors found that the viscosity of the fluidized bed resin mixture with the change of temperature, the injection pressure (kgf / cm ₂ ) and / or the injection amount (l / min) of the fluidized bed resin mixture into the rotating body, and the As a result of observing by changing the rotational speed (rpm) (centrifugal force (kgf)), the thermoplastic resin in the fluidized resin mixture injected into the rotating body under a predetermined condition was changed into powder form or fibrous form Floating over the whole, impurities were found to fall under the rotor in the form of fine powder.

In the present invention, it is particularly important to change the thermoplastic resin into powder or fibrous to float it on the rotating body and to drop impurities under the rotating body. If the thermoplastic resin does not float on the rotating body, the powdered or fibrous thermoplastic resin and impurities are mixed and it is impossible to separate them or it is expensive to separate them.

The rotating body of the present invention means a device that can be separated into a solid thermoplastic resin and impurities, respectively, at the moment when the injected fluidized resin mixture comes into contact with the surface of the rotating body. Accordingly, the rotating body of the present invention includes a conical top, a disc, a cup, a multi-shape, and the like.

A method for separating impurities from a resin mixture comprising one or more thermoplastic resins and impurities according to the present invention comprises heating the resin mixture to form a fluidized bed resin mixture, injecting the fluidized bed resin mixture into a rotating body. And separating the thermoplastic resin and the impurity by floating the thermoplastic resin on the rotating body and dropping the impurities below the rotating body, and collecting the thermoplastic resin.

In addition, an apparatus for separating impurities from a resin mixture comprising one or more thermoplastic resins and impurities according to the present invention is a melter that heats and stirs the resin mixture and raises the temperature above the melting point to form a fluidized bed resin mixture. ; A rotating body that floats the thermoplastic resin upward from the fluidized bed resin mixture and drops the impurities downward to separate the thermoplastic resin and the impurities; A controller for adjusting the centrifugal force of the rotating body, the viscosity of the fluidized bed resin mixture and the injection amount into the rotating body; And a collector for collecting the thermoplastic resin; The centrifugal force, viscosity, and injection amount are controlled by the controller to obtain a powdery or fibrous thermoplastic resin.

In addition, the centrifuge separating the impurities from the resin mixture comprising one or more thermoplastic resins and impurities according to the present invention floats the thermoplastic resin upwards from the injected fluidized bed resin mixture and drops the impurities downward, A rotating body separating the thermoplastic resin and the impurities; A controller for adjusting the centrifugal force of the rotating body, the viscosity of the fluidized bed resin mixture and the injection amount into the rotating body; And a collector for collecting the thermoplastic resin, wherein the centrifugal force, viscosity, and injection amount are adjusted by the controller to obtain a powdered or fibrous thermoplastic resin.

Since the impurity (soil, pigment, metal, etc.) can be separated from the resin mixture by injecting a fluidized bed resin mixture into the rotating body, the process is simple, economical, and a high purity thermoplastic resin can be obtained.

In addition, the present invention can separate the impurities simply and economically because the injected fluidized resin mixture is separated into solid thermoplastic resin and impurities at the moment of contact with the surface of the rotating body.

In addition, the centrifugal separator of the present invention may be separated into a solid thermoplastic resin and impurities by contacting the injected fluidized resin mixture with the surface of the rotating body.

Hereinafter, a method and apparatus for separating impurities from a resin mixture comprising at least one thermoplastic resin and impurities according to the present invention, and a centrifuge used therein will be described in detail with reference to the drawings.

1 is a process diagram schematically illustrating a process for separating thermoplastic resins and impurities from a resin mixture comprising at least one thermoplastic resin and impurities according to the present invention, and FIG. 3 is a perspective view showing another form of the rotating body of the centrifuge according to the present invention.

(Melting machine)

The melter 10 of the present invention accommodates the resin mixture introduced into the melting tank 11 and receives heat from the heated heat medium oil 12 to melt the resin mixture. The melter 10 of the present invention may use a heat medium oil, or may be any device capable of melting the resin mixture, such as a heating element heating method, an induction heating method, and an extruder method.

Inside the melter 10 of the present invention, a stirrer 13 capable of stirring the resin mixture is installed. This stirrer 13 not only helps to melt the resin mixture but also serves to crush and evenly mix impurities contained in the resin mixture. Since the present invention targets impurities firmly adhered to the thermoplastic resin, the impurities contained in the resin mixture are preferably crushed and evenly dispersed.

The resin mixture heated above the melting temperature becomes fluid, and this fluidized bed resin mixture is sent to the storage tank 20 along the pipe 14. At this time, the fluidized bed resin mixture should have at least enough fluidity to allow pumping through the pipe. Since the heating element is installed and heated in this pipe 14, fluidity is not lost when the fluidized bed resin mixture is transferred through the pipe. The pipe 14 is provided with a valve 15 capable of controlling the flow of the fluidized bed resin mixture.

(Storage tank)

The storage tank 20 of the present invention is an apparatus for temporarily storing and homogenizing the fluidized bed resin mixture. This storage tank 20 is also provided with a heating device to maintain the fluidity of the fluidized bed resin mixture.

In addition, since the impurities dispersed in the fluidized bed resin mixture stored in the storage tank 20 may aggregate with each other, it is preferable to homogenize the resin mixture by continuing stirring with the stirrer 21. In addition, temperature may be controlled so that the fluidized bed resin mixture has a viscosity suitable for centrifugation. The fluidized bed resin mixture in the storage tank 20 is sent to the centrifuge 30 through a pipe 22 provided with a heating element.

(Centrifuge)

The centrifuge 30 according to the present invention includes at least a rotor 32, a motor 33 for driving the rotor 32, and a collector 31 for collecting a powdered or fibrous thermoplastic resin. The fluidized bed resin mixture sent to the centrifuge 30 through the pipe 22 is injected into the rotating body 32 from the nozzle 34. Although the present invention uses a conical shape having a top surface cut as a preferred embodiment of the rotating body 32, the disk 321 as shown in Figure 3, the multi-blade 322 shown in Figure 4 and shown in Figure 5 The cup type 323 etc. which were used can also be used. The rotating body 32 is not particularly limited as long as it is a material that withstands high temperature, but is preferably made of stainless steel or ceramic.

The resin mixture injected into the center of the rotating body 32 rotating at high speed is subjected to centrifugal force so that impurities having a relatively high specific gravity fall under the rotating body in a powder state, and the thermoplastic resin having a small specific gravity is powder or fiber on the rotating body. Will emerge in the form.

The fluidized bed resin mixture is highly viscous, and very large centrifugal force is required to separate impurities dispersed in this highly viscous resin mixture. The inventors of the present invention focus on the fact that the impurities present in the solid phase have a large specific gravity, and the impurity is discharged under the rotating body, and a relatively small specific gravity thermoplastic resin is floated on the rotating body to think of a method of separating.

The present inventors have conducted research to easily separate the thermoplastic resin and impurities from the fluidized bed resin mixture and found that the solid phase impurity can be dropped to the bottom of the rotating body because it will maintain the solid phase even when separated from the resin mixture. In addition, the present inventors can obtain a powdery or fibrous thermoplastic resin which floats on the rotor when the viscosity of the fluidized resin mixture, the injection pressure and / or injection amount of the fluidized resin mixture from the nozzle, and the centrifugal force of the rotor are adjusted. I found that. Impurities fall below the rotor and the thermoplastic rises above the rotor, but the specific gravity of the soil (specific gravity of 2.8) or aluminum (specific gravity of 2.7) is relatively high, but the thermoplastic resin (approximately 0.9 to 0, depending on the type of resin) It is thought that this is because the specific gravity of 1.5) is relatively small and the thermoplastic resin is separated into powder or fibrous form.

The rotating body of the present invention means a device that can be separated into a solid thermoplastic resin and impurities, respectively, at the moment when the injected fluidized resin mixture comes into contact with the surface of the rotating body.

When the thermoplastic resin is separated in the form of powder or fiber, it floats on the rotating body rotating at high speed, and when the floating thermoplastic resin is collected through the collector 31, the thermoplastic resin and impurities are separated from the fluidized bed resin mixture very efficiently. You can do it. The collecting method of the collector 31 shown in FIG. 1 of the present invention uses a vacuum collecting method using a vacuum inhaler, but the collector 31 is not particularly limited as long as it is a device capable of collecting powdery or fibrous thermoplastic resin. The collector 31 using the vacuum inhaler collects the thermoplastic resin through the suction port of the collector 31 under reduced pressure.

6 and 7 show a collector 31 using an electrostatic induction conveyor, which is another embodiment of the collector 31 according to the present invention. 6 is a plan view of the collector 31 according to the present invention, Figure 7 is a cross-sectional view thereof. The collector using the electrostatic induction conveyor 311 is centrifuged to charge the negative charge to the powder or fibrous thermoplastic resin floating on the rotor 32 and attach the negatively charged thermoplastic resin to the electrostatic induction conveyor 311 having a positive charge. And the conveyor is moved to collect the thermoplastic resin through the bag filter type collecting port 312. Reference numeral 313 denotes a ventilation hole for venting gas that may be generated during centrifugation to the outside.

Since the viscosity of the fluidized bed resin mixture is a function of the temperature of the resin mixture and the composition of the resin mixture, but the composition of the resin mixture is difficult to control due to the nature of the waste, in the present invention, the viscosity control of the resin mixture is a method of adjusting the temperature of the resin mixture. Was adopted. The temperature of the fluidized bed resin mixture can be adjusted by installing heating elements in the melter 10, storage tank 20, or piping 22 or by other known methods. In the present invention, the temperature of the resin mixture was controlled to adjust the viscosity of the resin mixture to 3 to 10 cps corresponding to the viscosity of the fountain pen ink.

In addition, in the present invention, the injection pressure and / or injection amount of the fluidized bed resin mixture injected into the rotating body can be adjusted by controlling a pump (not shown) or the nozzle 34. The centrifugal force of the rotating body is a function of the diameter of the rotating body and the rotating speed, but the diameter of the rotating body is fixed (the present invention uses a disc of 200 mm in diameter), and can be adjusted by controlling the rotating speed of the rotating body.

The ambient temperature of the rotating body affects the crystallinity of the powdered or fibrous thermoplastic resin floating on the rotating body. Since the present invention focused on removing impurities from the thermoplastic resin mixture, the ambient temperature of the rotating body was kept at room temperature.

The viscosity of the fluidized bed resin mixture, the injection pressure and / or injection amount into the rotating body, and the centrifugal force of the rotating body can be controlled via the controller 38. The controller 38 of the present invention may be individually installed for each member to control the viscosity, the injection pressure and / or the injection amount, and the centrifugal force, respectively, or may be controlled by one controller as a whole. In addition, the control mechanism of the present invention includes manually adjusting the injection pressure and / or injection amount and the like.

In addition, the present invention can be installed through the monitor (not shown) and the monitoring camera 37 to monitor the state in which the thermoplastic resin and impurities are separated. If the separation of the thermoplastic resin and impurities is poor as a result of monitoring of the monitor, the separation state is controlled by the controller 38.

The powdered or fibrous thermoplastics floating on the rotor 32 may comprise a plurality of thermoplastics, which are collected via the collector 31. In addition, impurities falling at a high speed in a powder state under the rotating body 32 are collected by operating the valve 36 installed in the lower part of the centrifuge 30.

(Resin storage tank)

Powdered or fibrous thermoplastics are collected by the collector and sent to the resin storage tank 40 through the pipe 35. Thermoplastic resins are used as raw materials in the form of powders (fibers) or pellets, depending on the injection molding method. Therefore, the thermoplastic resin collected in the form of powder or fiber according to the present invention can be used as a recycled raw material in this state.

(Melt extruder, etc.)

When the raw material in the form of pellets is required, the powdery or fibrous resin is sent to the melt extruder 50 through the pipe 42. The resin extruded from the melt extruder 50 is cut into a predetermined size in the cutter 70 via the cooler 60 to be pellets. The pellets are sent to the pellet reservoir 80 via the pipe 71 and stored. Here, reference numerals 41 and 81 denote valves.

Hereinafter, a method of separating the thermoplastic resin and impurities from the resin mixture by the regeneration device according to the present invention described above will be described in detail.

Example  One

Generally, the film used for agriculture uses low density polyethylene (LDPE) as a raw material, but the mulching film often uses high density polyethylene (HDPE) as a raw material. In addition, high density polyethylene has a black color because carbon is used as a pigment. Since the mulching film is installed on the arable land, the soil is strongly attached to the surface of the film as if it is coated, and foreign materials such as sand, iron chips, and water are included in the collecting process.

The collected mulching film is cut into an appropriate size, and a pretreatment step of removing sand or iron chips is performed. A piece of metal can be separated using a magnet, and sand can be removed by placing it on a moving rack and vibrating the rack. This pretreatment step may not be carried out depending on the state of the collected mulching film.

Subsequent to the pretreatment step, the mulching film is introduced into the melter 10 and melted. In this embodiment, the mulching film was put into the melter and then melted while stirring the mulching film using the stirrer 13 while raising the temperature. At this time, the mulching film becomes a liquid while melting, and the soil adhering to the surface of the mulching film is mixed with the mulching film in a liquid state while being crushed.

Although the melting temperature of polyethylene which is a raw material of a mulching film is about 100 degreeC-135 degreeC, in order to provide fluidity to a melted mulching film, a heating temperature should be as high as possible in the temperature range below flash point temperature.

The melted and fluidized mulching film (hereinafter referred to as "fluent liquid phase resin mixture") is sent to the centrifuge 30 by a pump and centrifuged. In this example, the temperature of the fluidized bed resin mixture in which PE is the main component was adjusted in the range of 145 ° C to 200 ° C. However, in the fluidized bed resin mixture, the PE may be mixed with PP or PET film due to the main component or the nature of the waste. In this case, since the melting temperature of PET is higher than the melting temperature of PE, it is necessary to raise the upper limit of the temperature.

In this example, the temperature was adjusted so that the viscosity of the fluidized bed resin mixture was 3-10 cps. The lower the viscosity of the fluidized bed resin mixture is suitable for centrifugation, but the melted resin has a higher viscosity by itself and the temperature of the resin mixture must be higher to lower the viscosity of the fluidized bed resin mixture. Good to do. On the other hand, when the viscosity of the fluidized resin mixture is increased, impurities are not separated from the resin mixture or the rotational speed (centrifugal force) of the rotating body must be increased to separate the impurities, so the upper limit of the viscosity is preferably 10 cps.

This embodiment uses a rotor 32 having a diameter of 200 mm, so that the centrifugal force generated in the rotor is a function of the rotational speed. In this embodiment, the rotational speed of the rotating body is 2,000-20,000 rpm, preferably 5,000-20,000 rpm, particularly preferably 10,000-20,000 rpm. The rotational speed of the rotor should be adjusted to separate impurities from the fluidized bed resin mixture and to allow the thermoplastic resin to float above the rotor in powder or fibrous form. However, as the rotational speed of the rotating body was increased, PE in powder form could be obtained. However, considering the safety of the rotating body, the upper limit of the rotating speed of the rotating body may be limited to 20,000 rpm.

In this embodiment, the injection pressure injected from the nozzle 34 into the rotating body 32 was adjusted in the range of 3 to 5 kgf / cm 2. The diameter of the nozzle 34 used in the present embodiment is not particularly limited, but considering that the diameter of the rotating body is 200mm is suitable 10mm ~ 40mm. The injection amount of the fluidized bed resin mixture into the rotating body is a function of the diameter of the nozzle and the injection pressure, and the injection amount is 5 to 20 L / min because it directly affects the production amount of the thermoplastic resin.

In this embodiment, the ambient temperature of the rotating body was maintained at room temperature in order to obtain a powdery or fibrous thermoplastic resin.

Example  2

Currently used multilayer films are generally made of a film made of thermoplastic resins such as PET, PP, PE, and the like and metal (usually aluminum) coated on these films. The multilayer film may also contain foreign objects such as food, sand, iron chips, and soil during the collection process.

Since the pretreatment process and the melting step are substantially the same as in Example 1, the description thereof is omitted.

The melting temperatures of PE, PP, and PET, which are the raw materials of the multilayer film, are about 100 ° C to 135 ° C, about 155 ° C to 165 ° C, and about 245 ° C to 275 ° C, respectively. It is as high as possible in temperature range. In addition, many types of films are often mixed in the collected multilayer films due to the nature of the waste. Therefore, when these films are mixed, they must be heated to a temperature higher than the temperature of the film having the highest melting point to impart fluidity.

The molten, fluidized multilayer film (hereinafter referred to as "fluid resin mixture") is fed to the centrifuge 30 with a pump and centrifuged.

In the present example, when PE was the main component, the temperature of the fluidized bed resin mixture was adjusted in the range of 145 ° C to 200 ° C. In addition, when PP was the main component, the temperature of the fluidized bed resin mixture was adjusted to be in the range of 180 ° C. to 220 ° C., and when PET was the main component, the temperature of the fluidized bed resin mixture was adjusted to be in the range of 280 ° C. to 320 ° C. However, when PE, PP, and PET were mixed in the fluidized bed resin mixture, the temperature range was appropriately adjusted.

Since the rest of the process is substantially the same as in Example 1, the description is omitted.

Although the present invention has been described in accordance with the preferred embodiment, those skilled in the art will be able to modify the above-described invention in various ways. In other words, in the present invention, the mulching film is mainly targeted, but other agricultural films and industrial films can also be reproduced using the present invention. In addition, the present invention mainly made a multilayer film, it is of course applicable to a single layer film and a film that is not coated with a metal. In addition, the present invention is applicable to a product in which a metal is coated on a thermoplastic resin in a plate form, a sheet form or a lump form.

In addition, the present invention is directed to one or two or more thermoplastic resins which are melted by increasing the temperature, but may also be targeted to thermosetting resins which do not pyrolyze at the melting point temperature of the thermoplastic resin. In addition, it is apparent that the present invention is applied not only to the film form but also to the thermoplastic resin in the form of agglomerates. Although the present invention uses a centrifugal separation method using a rotating body to separate the thermoplastic resin and impurities economically and conveniently, it is also clear that other types of centrifugal separation methods that can be separated into a solid phase and a solid phase also fall within the protection scope of the present invention. something to do. Accordingly, the above embodiments are disclosed for illustrative purposes only and the invention is not to be construed as limited to the matters set forth in the claims.

1 is a process diagram schematically illustrating a process for separating thermoplastic resins and impurities from a resin mixture comprising one or more thermoplastic resins and impurities according to the present invention.

2 is a view showing a state in which the thermoplastic resin and impurities are separated in the centrifuge according to the present invention.

3 to 5 is another form of the rotating body of the centrifugal separator according to the present invention, that is, Fig. 3 is a perspective view showing a disc shape, Fig. 4 is a multi-wing type and Fig. 5 is a cup type, respectively.

6 and 7 show a collector 31 using an electrostatic induction conveyor according to the present invention, where FIG. 6 is a plan view of the collector 31 and FIG. 7 is a cross-sectional view thereof.

Claims (9)

A method of separating impurities from a resin mixture comprising one or more thermoplastic resins and impurities, Heating the resin mixture to form a fluidized bed resin mixture; Injecting the fluidized bed resin mixture into a rotating body; Separating the thermoplastic resin and the impurities by floating the thermoplastic resin on the rotating body and dropping the impurities below the rotating body; And Impurity separation method comprising the step of collecting the thermoplastic resin. The method of claim 1, The separating step is performed by adjusting the centrifugal force of the rotating body, the viscosity of the fluidized bed resin mixture and the injection amount into the rotating body. The method according to claim 1 or 2, Impurity separation method characterized in that the viscosity of the fluidized bed resin mixture is 3 ~ 10cps. The method according to claim 1 or 2, The thermoplastic resin to be separated and collected is an impurity separation method, characterized in that the powder or fiber. The method according to claim 1 or 2, The rotating body is an impurity separation method, characterized in that any one of the upper surface is a cone-shaped, disc-shaped, cup-shaped and multi-ick type. An apparatus for separating impurities from a resin mixture comprising one or more thermoplastic resins and impurities, A melter that heats and stirs the resin mixture and warms it to a temperature above the melting point to form a fluidized bed resin mixture; A rotating body that floats the thermoplastic resin upward from the fluidized bed resin mixture and drops the impurities downward to separate the thermoplastic resin and the impurities; A controller for adjusting the centrifugal force of the rotating body, the viscosity of the fluidized bed resin mixture and the injection amount into the rotating body; And Including a collector for collecting the thermoplastic resin, Impurity separation apparatus characterized in that to obtain a powdery or fibrous thermoplastic resin by adjusting the centrifugal force, viscosity and injection amount with the controller. The method of claim 6, The rotating body is an impurity separation device, characterized in that any one of the top surface is chamfered, disk-shaped, cup-shaped and multi-ick type. A centrifuge for separating impurities from a resin mixture comprising one or more thermoplastic resins and impurities, A rotating body that floats the thermoplastic resin upward from the injected fluidized bed resin mixture and drops the impurities downward to separate the thermoplastic resin and the impurities; A controller for adjusting the centrifugal force of the rotating body, the viscosity of the fluidized bed resin mixture and the injection amount into the rotating body; And Including a collector for collecting the thermoplastic resin, Centrifuge, characterized in that to obtain a powdery or fibrous thermoplastic resin by adjusting the centrifugal force, viscosity and injection amount with the controller. The method of claim 8, The rotating body is a centrifugal separator, characterized in that any one of the top, the cone-shaped, disc-shaped, cup-shaped and multi-winged.

Images