JP4245467B2 - Resin recycling system and method - Google Patents

Description

The present invention is disposed device: from (eg electrical and electronic equipment) recovered from the resin piece, relates to a resin recycling system to obtain a resin material having a pellet and not inferior quality new.

  Resins that are lightweight and have excellent mechanical strength are widely used in internal parts and exterior materials of home appliances, OA equipment, communication equipment, and the like. From the viewpoint of environmental protection, full-scale recycling of resin products is strongly demanded, such as the recycling of household electrical appliances has been stipulated while the conversion from the conventional mass production / disposal economy to a recycling economy is required. ing. For this reason, it is considered that the resin is recovered from the discarded product, and is crushed to the size of a pellet and reused. However, the resin used as a product has various stains and foreign substances attached to its surface, and its surface part has deteriorated, so it can be reused for the same purpose as virgin resin after crushing. First, it is necessary to scrape and remove the surface portion.

The following can be listed as technologies related to resin recycling.
(1) Supply water and recovered resin pieces from one end of the washing tank, and make it move with a screw while scraping the surface by colliding with the rough surface of the fixing plate provided in the washing tank, and discharging from the other end of the washing tank A cleaning device (see Patent Document 1).
(2) A different color resin removing device that removes the different color resin by blowing off the detected portion when the different color resin is detected by sliding down on the slope so that the recovered resin piece is one layer and observing with a camera (Patent Document) 2 paragraph 0010 and FIG. 5).

JP2003-154522A. JP2003-089118A.

No system has been provided that efficiently removes and removes dirt, foreign matter, or deteriorated portions of the resin that are collected on the surface of the resin pieces recovered from the discarded product, and has a quality comparable to new pellets.
The present invention is scraped off dirt and foreign matter or degraded portion of the resin adhering to the surface of the resin piece is removed, and an object thereof is to provide a high efficiency is obtained recycling system a resin piece having a pellet and not inferior quality new.

The present invention is configured as described in [1] to [ 2 ] below.
[1] Configuration 1:
A screw and a flow path regulating member are arranged in a horizontal cylindrical washing tank, and the flow path regulating member suppresses the progress while the resin piece and water supplied from one end of the washing tank are advanced by the screw. a cleaning device for discharging from the other end after repeating the rough surface of the cleaning tank to collide to cut the surface of the resin piece and,
A transport device having a transport surface member through which a large number of pores are penetrated and a watering device are provided, and the resin piece and water discharged from the other end of the cleaning tank of the cleaning device are received at the start end of the transport surface member. Polishing debris removal that sprays water on the transport surface member while spraying water in the form of a shower with a watering device and discharges resin pieces from the end portion, and discharges water from the numerous pores of the transport surface member through drain pipes Equipment,
A cleaning water circulation system for collecting water discharged through the drain pipe of the polishing debris removal apparatus and removing foreign matter, and then supplying one end of a cleaning tank of the cleaning apparatus and the watering device;
A screw is arranged in a horizontally disposed cylindrical cleaning tank, and hot water and a resin piece discharged from the terminal end of the conveying surface member of the polishing dust removing device are supplied at one end of the cleaning tank, A warm water rinsing device that advances while stirring with a screw and discharges from the other end;
The wings are arranged on the central rotating shaft in the vertically placed cylindrical centrifugal dewatering tank and the dewatering screen is arranged on the inner peripheral surface, and separated from the other end of the washing tank of the hot water washing apparatus. with a discharged the resin piece and the hot water was allowed to proceed playing a rotating vane to the collision is furuncle one above the dewatering screen received from the lower portion of the centrifugal dewatering tank without discharging the resin pieces from the top, from the water passing holes of the dehydration screen A centrifugal dehydrator that discharges hot water through a drainpipe ;
A hot water circulation system independent of the washing water circulation system, which collects the hot water discharged through the drainage pipe of the centrifugal dewatering device to remove foreign substances and supplies the heated water to one end of the washing tank of the warm water washing device. When,
Resin that forms a vertically placed cylinder , separates the resin pieces discharged from the centrifugal dehydrator into the cylinder , separates them using the flow velocity distribution in the cylinder direction of the upward air flow, and falls down the cylinder An airflow sorting device for collecting pieces,
A resin recycling system characterized by comprising:
The apparatus having a function of cleaning equipment, for example, a cleaning device described in Patent Document 1 (JP 2003-154522).
The apparatus having a function of centrifugal dewatering equipment, for example, a "pellet continuous dehydrator SCR-600 Model" manufactured by KK Tanaka.
Further, in the centrifugal dewatering equipment, as a member having an inner peripheral surface a number of pores are penetrating the plane intersecting direction, dewatering screens (punching metal which is used in the pellet continuous dehydrator SCR-600 type For example, the inner peripheral surface may be formed of a mesh member such as a wire mesh.
Is the air flow sorting equipment, can be used according to Japanese Patent Application No. 2003-387419, the assignee of the present applicant.
Specific examples of each of the above devices will be described in detail in the section of the best mode.

Specific examples of the hot-water washing equipment is described in detail in the best mode section.
Specific examples of the hot water circulation system will be described in detail in the best mode section.

[ 2 ] Configuration 2 :
In configuration 1 , further
In the subsequent stage of the air flow sorting device,
A metal removing device that removes the metal piece by switching the conveyance destination of the detection portion when the metal piece mixed in the resin piece being conveyed is detected based on a change in eddy current;
And / or
A different color resin removing device that removes the different color resin by blowing off the detection portion when the different color resin mixed in the resin piece sliding down the slope is detected by the camera;
A resin recycling system characterized by providing
As a means for detecting a metal piece in the resin piece based on a change in eddy current, for example, an all-metal removing device “RAPID COMPACT 70” manufactured by Ebara Industries Co., Ltd. can be mentioned.
As a different color resin removal equipment, for example, it can be given unique particle sorting machine according to paragraph 0010 and FIG. 5 of Patent Document 2 (JP 2003-089118).
Specific examples of the metal removal equipment and different colors resin removal equipment is described in terms of the best mode.

[7] Resin to be recycled:
The types of resins that can be recycled by the system and method of the present invention include polyolefin resins such as polyethylene, polypropylene, and ethylene-propylene copolymers, polystyrene (PS), rubber-modified polystyrene, acrylonitrile-butadiene-styrene copolymers ( ABS resin), styrene resins such as acrylonitrile-styrene copolymer and styrene-methyl methacrylate copolymer, and polyester resins such as polybutylene terephthalate (PBT), polyethylene terephthalate, and polyethylene naphthalate.
Further, polycarbonate (PC) resin, polysulfone resin, polyethersulfone resin, polyarylsulfone resin, polyphenylene ether (PPE) resin, vinyl chloride resin, vinylidene chloride resin, halogen-containing resin such as chlorinated polyethylene, 6 nylon, 6, In addition to polyamide resins such as 6 nylon, polyamideimide resins, and the like, thermoplastic elastomers such as polyolefin, polystyrene, polyester, polyamide, and polyurethane can also be recycled.
Furthermore, various polymer blends or polymer alloys containing these polymers, such as PC / ABS alloy, PC / PS alloy, modified PPE, PBT / ABS alloy, etc., can also be recycled by the system and method of the present invention.

The recycling system of configuration 1 is configured by arranging a screw and a flow path regulating member in a horizontal cylindrical washing tank, and advancing the resin piece and water supplied from one end of the washing tank by the screw. a cleaning device for discharging from the other end after repeating the rough surface of the cleaning tank to collide to suppress the progress by flow path regulating member cutting the surface of the resin piece, conveying surface member which many pores are through A transporting device having a watering device and a watering device, receiving a resin piece and water discharged from the other end of the cleaning tank of the cleaning device at the starting end of the transporting surface member, and spraying water in a shower shape by the watering device. while discharging the resin pieces from the end portion conveys the conveying surface member above with the polishing debris removal device for discharging water from a large number of pores through the drain pipe of the conveying surface member, the drainage tube of the polishing dust removing device Collect the water discharged through the After being removed, the cleaning water circulation system that supplies the cleaning tank with one end of the cleaning tank and the sprinkler, and a screw is disposed in a horizontal cylindrical cleaning tank to remove hot water and the polishing debris. A hot water rinsing apparatus for supplying a resin piece discharged from the terminal end of the conveying surface member of the apparatus at one end of the cleaning tank, advancing while stirring with a screw and discharging from the other end, and a cylinder placed vertically Resin discharged from the other end of the washing tank of the hot water rinsing apparatus, with a wing arranged on the central rotating shaft in the shape of a centrifugal dewatering tank and a dewatering screen arranged on the inner peripheral surface with pieces and hot water is allowed to proceed to one furuncle collide upward dewatering screen playing a rotating vane accepted from the bottom of the centrifugal dewatering tank for discharging the resin pieces from the top, the hot water through the drain pipe from the water passing holes of the dehydration screen to discharge the centrifugal dehydration Location and the centrifugal supply hot water to be discharged through the drain pipe of the dewatering apparatus and heated with recovered to remove the foreign matter to the end portion of the cleaning tank of the hot water washing apparatus, independent of said washing water circulation system a hot water circulation system forms a vertical in-cylinder shape, and fractionated using the flow velocity distribution in the cylinder direction of the air flow directed upward received in the cylinder of the resin pieces discharged from the centrifugal dehydrator, the cylinder Since it has an airflow sorting device that collects resin pieces that fall downward, it removes dirt and foreign matter adhering to the surface of the resin pieces or deteriorated parts of the resin, and removes the resin pieces with quality comparable to new pellets. Can be obtained efficiently. Further, by circulating the washing water used in the cleaning equipment polishing debris removal equipment can be used. Also, with the a could not be separated and removed by polishing dust removal equipment have adhered to the resin piece foreign substances can be sufficiently separated from the resin piece Te warm water washing equipment, resin pieces fed to the centrifugal dewatering equipment is heated the heat becomes easier to be dried because it is warm, so that the state was sufficiently dried at the time the discharged al placed centrifugal dehydration instrumentation. Further, it is possible to circulate using the hot water used in the hot-water washing equipment.
Recycling system of the configuration 2, in the above configuration 1, further downstream of the air flow sorting equipment, the metal pieces mixed in the resin piece being conveyed is detected based on a change of the eddy current the metal removal equipment for removing the metal piece by switching the conveying destination of the detection portion, and / or, if different color resin mixed in the resin piece in the sliding slope is detected by the camera blow the detection portion since the different-color resin removal equipment for removing the different-color resin, was provided by, even if the metal and / or different colors resin is mixed in the resin piece recyclable, they may be removed.

Specific examples of the present invention will be described with reference to the drawings.
FIG. 1 shows the overall configuration of this specific example recycling system.
The illustrated recycling system includes a cleaning device 10, a polishing waste removal device 20 provided at the rear stage of the cleaning device 10, a hot water washing device 30 provided at the rear stage of the polishing waste removal device 20, and a subsequent stage of the warm water washing device 30. The centrifugal dehydration drying device 40 provided in the above, the air flow sorting device 50 provided in the subsequent stage of the centrifugal dehydration drying device 40, the metal removing device 60 provided in the subsequent stage of the air flow sorting device 50, and the subsequent stage of the metal removing device 60. And a cleaning water circulation system 90 that removes polishing scraps from the water discharged from the polishing scrap removal device 20 and returns them to the cleaning device 10 and the polishing scrap removal device 20. A hot water circulation system 80 is provided which adds steam to the hot water discharged from the centrifugal dehydrating and drying apparatus 40 to raise the temperature and return it to the hot water washing apparatus 30.

(1) Cleaning device 10:
The cleaning apparatus 10 will be described with reference to FIGS. 2 and 3.
As illustrated, the cleaning device 10 includes a water supply pipe 1011 and a water supply opening 1011 a, a resin piece inlet 1021, a cleaning tank 1030, a rotating shaft 1035, a resin piece discharge outlet 1022, a drain outlet 1012 a, and a drain pipe 1012.
The cleaning tank 1030 can be made of a metal such as stainless steel, for example.
In the two-axis example (1-A) in the illustrated example, the cleaning tank 1030 has a shape in which two cylinders are arranged side by side and the contact portions communicate with each other. Rotating shafts 1035 are provided in the center of the inside of each cylinder so as to face each other in the longitudinal direction, and both end portions thereof are rotatably and watertightly supported by support members provided on both end surfaces of the cleaning tank 1030, respectively. Yes. Each rotary shaft 1035 is driven to rotate by receiving a rotational drive force from a common drive source (not shown).
A resin piece inlet 1021 is formed at one end (upstream side) of the cleaning tank 1030, and a discharge port 1022 is formed at the other end (downstream side). In the illustrated example, the input port 1021 and the discharge port 1022 are provided on the peripheral surface of the cleaning tank 1030 in consideration of ease of handling, but may be provided on the end surface.
Further, a water supply port 1011a is provided on the upper peripheral surface on the upstream side of the cleaning tank 1030, and a drain port 1012a is provided on the lower peripheral surface on the downstream side. In addition, these may be provided in each part in the longitudinal direction of the cylinder, and water supply or drainage may be performed in each part.
In the tank of the cleaning tank 1030, there are a screw part 1041 provided with a screw 1041a (FIG. 3) and a flow path regulating part 1045 provided with flow path regulating members 1045a and 1045b (FIG. 3) instead of the screw. Are arranged alternately in the longitudinal direction.

The configuration and operation of the screw part 1041 and the flow path restricting part 1045 will be described with reference to FIG.
In the screw portion 1041, a screw 1041a is integrally attached to the rotating shaft 1035 as shown in the figure. As a result, the screw 1041a is rotated integrally with the rotating shaft 1035 so as to push the water and resin pieces in the cleaning tank 1030 from the direction of the inlet 1021 to the direction of the outlet 1022 (from left to right in the figure). Proceed to.
In the flow path regulating unit 1045, as shown in the drawing, the rotary plate 1045a is rotated from the peripheral surface of the rotary shaft 1035 toward the cylinder inner surface of the cleaning tank 1030 and orthogonal to the longitudinal direction of the cylinder. 1035 is integrally attached. Further, the fixed plate 1045b is attached to the inner surface of the cleaning tank 1030 so as to be directed from the inner surface of the cleaning tank 1030 toward the rotation axis 1035 and perpendicular to the longitudinal direction of the cylinder. For this reason, when the rotating shaft 1035 is rotated as described above and the water or the resin piece advances in one direction in the longitudinal direction of the cylinder (from the left to the right in the figure) by the action of the screw 1041a, the water or the resin piece is It collides with the end faces of the rotating plate 1045a and the fixed plate 1045b, is deflected, and flows in a direction perpendicular to the longitudinal direction of the cylinder, while proceeding in one direction in the longitudinal direction as a whole. For this reason, while the time which water and a resin piece exist in the washing tank 1030 becomes long, a flow direction draws a complicated locus | trajectory, and a resin piece contacts the surface of each member in the washing tank 1030. The number of times increases. In order to enhance the effect of the flow path regulating unit 1045, a reverse feed screw having a feeding capability from the outlet side toward the inlet side may be used as a part of the flow path regulating unit 1045.
As described above, in the present apparatus, since the screw portions 1041 and the flow path restricting portions 1045 are alternately provided in the longitudinal direction of the cylinder, water and resin pieces that are pushed and advanced by the screws 1041a are prevented from being flow restricted. The process in which the flow direction is diverted by the part 1045 to reduce the traveling speed is performed in each part in the longitudinal direction. For this reason, the malfunction that a high voltage | pressure generate | occur | produces in a certain local part is also prevented.

The surface of each member in the cleaning tank 1030 (the cylinder inner surface of the cleaning tank 1030, the exposed surface of the rotating shaft 1035, the blade surface of the screw 1041a, the end surface of the rotating plate 1045a, the end surface of the fixed plate 1045b) is blasted with hard particles. And / or, since the surface is roughened by thermal spraying or welding treatment of a hard material, when the number of times that the resin piece contacts the surface of each member in the cleaning tank 1030 increases, the surface of the resin piece is coated. The film / label / dirt and other foreign matters are easily polished or scraped, and the cleaning effect is increased.
The flow trajectory and flow time of water and resin pieces for obtaining a good cleaning action are the speed of the rotating shaft 1035, the cylinder inner diameter of the cleaning tank 1030, the cylinder length of the cleaning tank 1030, the peripheral surface of the rotating plate 1045a and the cleaning tank 1030. Clearance B between the inner surface of the cylinder, clearance C between the inner peripheral surface of the fixed plate 1045b and the peripheral surface of the rotary shaft 1035, clearance A between the end surface of the rotary plate 1045a and the end surface of the adjacent fixed plate 1045b, etc. Can be obtained by appropriately adjusting. Moreover, it can also obtain by adjusting the length of the screw part 1041 and the flow-path control part 1045, and ratio of this length appropriately.
In the example of FIG. 3, the flow path restriction unit 1045 is configured by alternately arranging the rotating plates 1045a and the fixed plates 1045b. However, the rotating plates 1045a and the fixed plates 1045b are not necessarily provided alternately. Alternatively, the flow path restriction unit 1045 may be configured by only one of the rotating plate 1045a and the fixed plate 1045b. In addition, in the example of FIG. 3, the rotating plate 1045a and the fixed plate 1045b have a complete disc shape or a ring shape when viewed from the end face side, but may have a shape in which a part is notched. Good.
In the example of FIG. 3, the rotating plate 1045a and the fixed plate 1045b are provided so as to be orthogonal to the longitudinal direction of the cylinder, but the present invention is not limited to such an installation method. You may provide so that it may cross at an angle.
In the example of FIG. 3, the flow path restricting portion 1045 and the screw portion 1041 are alternately provided in the longitudinal direction of the cylinder. However, when the rotating plate 1045 a is eliminated and the size of the fixed plate 1045 b is devised. The flow path regulating portion 1045 can be provided in the same section as the screw portion 1041. Of course, it can also be provided in all sections.

(2) Polishing waste removing device 20:
The water sent to the drain pipe 1012 of the cleaning apparatus 10, the resin pieces, and the polishing scraps scraped off from the surface of the resin pieces are poured into the conveyance start side end on the metal mesh 201 of the polishing scrap removal apparatus 20.
The polishing dust removing device 20 will be described with reference to FIG.
As shown in the figure, the polishing dust removing device 20 includes a vibration feeder 205 having a wire mesh 201 disposed on the upper surface, and a watering device 203 having a shower-like water spout opening above the wire mesh 201. As the mesh size (mesh) of the metal mesh 201, it is assumed that an appropriate size (size that allows polishing dust to pass but does not allow resin pieces to pass) according to the size of polishing dust to be removed is selected.
The vibration feeder 205 generates vibration in a direction indicated by a two-dot chain double arrow in the drawing. Due to this vibration, the object (resin piece and polishing scrap) on the wire net 201 is conveyed in the direction of the solid arrow while vibrating. In addition, the object (resin piece) that has reached the conveyance end portion is dropped into the warm water washing apparatus 30.
During the conveyance, water is sprayed from the water sprinkler 203 to the objects (resin pieces and polishing scraps) on the wire net 201. With this sprinkled water, foreign matters such as polishing dust adhering to the resin piece are washed away from the resin piece, pass through the wire mesh 201, pass through the drain pipe 202a from the slope 202 below the wire mesh 201, and the polishing waste / water separation device. 92 (FIG. 1).
As shown in FIG. 1, the polishing dust / water separator 92 is provided with a mesh-sized wire net 921 that allows water to pass but does not allow polishing dust (normal size polishing scrap (excluding ultrafine polishing scraps)) to pass. ing. The water from which the polishing debris has been removed by passing through the wire mesh 921 is once stored in the tank 94, and then sent out by the pump 95 in an appropriate amount, and after passing through the filter 96, the water supply pipe 1011 of the cleaning device 10 and the polishing debris. It is fed into the water supply pipe 203a for the watering device 203 of the removing device 20.

(3) Warm water washing apparatus 30:
The hot water washing apparatus 30 is demonstrated with reference to FIG.
Resin pieces dropped from the conveyance end of the metal net of the polishing dust removing device 20 are taken into the washing tank 301 of the hot water washing device 30 from the resin piece receiving port 303 of the hot water washing device 30. In addition, the hot water sent from the hot water circulation system 80 via the filter 86 (FIG. 1) is taken into the cleaning tank 301 through the water supply pipe 304.
A rotation shaft 302c is provided at the center of the cylinder in the horizontal cleaning tank 301. A screw 302 is attached to the rotation shaft 302c.
The resin piece and the hot water taken into the washing tank 301 as described above are transferred while being stirred from the left to the right in the drawing by the rotation of the screw 302, and the centrifugal dehydration drying apparatus is connected to the drain pipe 305 at the lower right end in the drawing. It is sent to the lower part of 40.
Although the illustrated example is a horizontal hot water rinsing apparatus, a vertical hot water rinsing apparatus may be used. In the case of the horizontal type, it is possible to take a sufficiently long distance to be transported while stirring, so that it can be sufficiently washed with water.

(4) Centrifugal dehydration drying device 40:
The centrifugal dehydration drying apparatus 40 will be described with reference to FIG.
Hot water and resin pieces fed from the hot water washing apparatus 30 are taken into the lower part of the centrifugal dewatering tank 402 from the receiving pipe 405 of the centrifugal dehydration drying apparatus 40.
A rotating shaft 403c is provided at the center of the cylinder of the centrifugal dewatering tank 402 that is vertically disposed, and a plurality of blades 403 are attached to the rotating shaft 403c. In addition, a dewatering screen (punching metal) in which a large number of pores (punching = water passage holes) are penetrated in the crossing direction at the front position (position facing the rotating shaft 403c) of the inner peripheral wall of the centrifugal dewatering tank 402. 401 is provided. As a hole diameter of the water passage hole of the dehydration screen 401, an appropriate size (size that allows foreign matters to pass but does not allow resin pieces to pass through) according to the size of the foreign matter to be removed is selected.
The resin piece and water taken into the centrifugal dewatering tank 402 as described above are flipped upward by the wings 403 rotated by the rotating shaft 403c. As a result, water or foreign matter (foreign matter having a size that passes through the dehydration screen 401) passes through the dehydration screen 401, passes through the drain pipe 406, and is sent to the hot water tank 84 (FIG. 1) of the hot water circulation system 80. On the other hand, the resin piece repelled by the dewatering screen 401 moves upward in the centrifugal dewatering tank 402 while being repelled by the upper wings, and passes through the discharge pipe 407 communicated with the upper position, and then the air flow sorting device 50. It is sent to.
As shown in FIG. 1, steam is sent to the hot water tank 84 from a steam generator (not shown) in addition to the hot water sent from the drain pipe 406. Thereby, the temperature of the hot water tank 84 is maintained at about 30 to 60 ° C. Note that heating by other heating means such as an electric heater may be used instead of steam. The warm water stored in the warm water tank 86 is sent out by an appropriate amount by the pump 85, passed through the filter 86, and sent to the washing tank 301 through the water supply pipe 304 of the warm water washing apparatus 30.

(5) Airflow sorting device 50:
The airflow sorting device 50 will be described with reference to FIG.
The resin pieces discharged from the centrifugal dehydration / drying device 40 are fed into the cylindrical portion 51 from the inlet 541 of the airflow sorting device 50.
The air flow sorting device 50 includes a cylinder portion 51, an intake device 52, an intake port 53, an input portion 54, and a recovery portion 55, and an air flow generated in the cylinder portion 51 by suction of the intake device 52. By utilizing the flow velocity distribution, the resin piece introduced from the introduction unit 54 is separated according to its shape, size, and density, and the resin piece falling from the lower end of the cylinder unit 51 is collected by the collection unit 55. .

The cylindrical portion 51 is provided such that cylinders 511a to 511d having a relatively large inner diameter and cylinders (narrow cylinders) 512a to 512c having an inner diameter smaller than the cylinders 511a to 511d are alternately stacked, and these are joined by a flange connecting portion 56. It is provided in the vertical direction. In addition, it may replace with a flange connection and may connect by a fitting structure, for example. Moreover, it may replace with the structure which connects a some cylinder, and you may comprise so that a cross-sectional area may be changed within one cylinder.
The inner diameters (diameters) C of the cylinders 511a to 511d are in the range of 130 to 150 mm, and the heights A1 to A4 are in the range of 200 to 300 mm. In this example, the inner diameter C is common to the cylinders 511a to 511d, but the heights A1 to A4 are different from each other in the cylinders 511a to 511d.
The inner diameters (diameters) D1 to D3 of the narrow cylinders 512a to 512c are in the range of 110 to 130 mm, and the heights B1 to B3 are in the range of 100 to 200 mm. In this example, the inner diameters D1 to D3 and the heights B1 to B3 are different in the narrow cylinders 512a to 512c, respectively.
In addition, you may change each said value suitably. Further, the cylindrical shape is not limited to the cylindrical shape, and an appropriate cylindrical shape such as an elliptical cylinder or a polygonal cylinder may be used.
In the example of FIG. 7A, four cylinders with a large inner diameter and three narrow cylinders with a small inner diameter are used, but the number of stages may be increased or decreased as appropriate.
In the example of FIG. 7A, the inner diameters (inner cross-sectional areas) of the narrow cylinders 512a to 512c are constant (no change) in the cylinder direction. Instead, for example, FIG. As shown in the narrow cylinder 512e, a cylinder whose inner diameter (inner cross-sectional area) changes in the cylinder direction may be used. Moreover, you may change the degree of this change suitably.

The intake device 52 includes a blower 521 and an air volume adjustment damper 522, and is provided so as to communicate with the cylinder portion 51 at the upper end portion of the cylinder portion 51. In addition, an air inlet 53 is provided at the lower end portion of the tube portion 51 so as to communicate the inside of the tube portion 51 with the outside.
When the blower 521 is operated, the outside air is sucked from the intake port 53 by the suction force, and the air is exhausted from the blower 521 in the upward direction through the cylinder portion 51. This air flow has a flow velocity distribution in the cylinder direction that is faster in a portion where the cross-sectional area in the cylinder portion 51 is narrow and slower in a wide portion. The air volume can be adjusted by adjusting the opening degree of the air volume adjusting damper 522. In other words, the opening degree of the air volume adjustment damper 522 can be adjusted so as to obtain an optimum foreign matter separation accuracy and a desired normal product recovery rate. Fine pieces (relatively light pieces separated from crushed materials such as paper pieces) contained in the air exhausted by the blower 521 are collected by a collection bag 57 behind the blower 521.

The input part 54 is provided in the middle of the cylinder part 51. A slope 541 having a predetermined slope that connects the inlet and the opening projects from the opening into the cylindrical portion 51 and extends toward the facing inner wall 5111. For this reason, the resin piece that has been introduced from the inlet and slid down the sloping path 541 collides with the facing inner wall 5111 and is scraped and dispersed, and discharged into the cylindrical portion 51. The As described above, since the momentum of falling at the time of sliding is scraped off and dispersed and discharged into the cylinder portion 51, each individual resin piece is sufficiently exposed to the airflow, and is relatively easy to fall. -Even if it is a resin piece of a size and a density, it becomes easy to receive a separation effect sufficiently in the cylinder part 51.
In the example shown in the figure, the insertion portion 54 is provided in a portion of the cylinder 511b, below which is a portion constituted by the cylinder 511b and the narrow cylindrical slant 512b, and a portion constituted by the cylinder 511c and the narrow cylinder 512c. There are two sets of cylinder-narrow cylinder portions. For this reason, even if the crushed material thrown in from the throwing-in part 54 is a resin piece of the shape, size, and density comparatively easy to fall, these two sets of cylindrical-narrow cylindrical parts are fully isolate | separated. Can do. It should be noted that the number of steps of the portion in the unit of the cylinder below the input portion 54 and the narrow cylinder may be changed as appropriate.

(6) Metal removal device 60:
The resin pieces that have been subjected to sorting by the airflow sorting device and from which the fine pieces have been removed are then removed by the metal removing device 60.
The metal removing device 60 is a device that removes the metal piece of the detection portion by switching the damper when the metal piece mixed with the resin piece being conveyed is detected by the metal detecting means.
As the metal detection means of the metal removal device 60, here, “all metal removal device RAPID COMPACT 70” manufactured by Ebara Industries Co., Ltd., which detects the presence of metal as a change in eddy current is used.

(7) Different color resin detection device 70:
The resin piece from which the metal piece has been removed by the metal removing device 60 is then removed by the different color resin removing device 70.
With reference to FIG. 8, the different color resin removal apparatus 70 is demonstrated.
The resin piece thrown into the hopper 7081 falls from the hopper 7081 and rests on the vibration feeder 7082, and is conveyed rightward in the drawing by the vibration feeder 7082 and slides down on the plane shooter 7083. When reaching the lower end of the plane shooter 7083, the resin pieces are arranged substantially in a single layer. In this state, the resin pieces pass through the position of the line sensor (camera) 7084, and the color tone is individually discriminated.
Each element of the line sensor 7084 does not output a signal when the resin piece passing through each detection position has a desired resin color tone, but when the resin piece passing through the detection position is not a desired resin color tone, A signal to that effect is sent to the control unit of the air nozzle 7085. As a result, the control unit of the air nozzle 7085 causes the nozzle corresponding to the air nozzle 7085 (= the desired material resin) at the timing when the resin piece that has passed the detection position of the corresponding element of the line sensor 7084 passes through the height of the nozzle opening of the air nozzle 7085. Only the nozzle corresponding to the element of the line sensor that has detected a resin piece of a color tone different from the above is operated, and the resin piece passing through the position is blown to the right in FIG. Thus, the resin piece is dropped to the removal port 7087. The resin piece that has not been blown off by the air nozzle 7085 is dropped into the recovery port 7086. In this way, the different color resin is removed.

The block explanatory view of the resin recycling system concerning an embodiment. The washing | cleaning apparatus 10 is shown typically, an upper stage is a front view, lower stage 1-A is sectional drawing in the case of 2 axes, and lower stage 1-B is sectional drawing in the case of 1 axis. The detail in the dashed-dotted line frame M of FIG. 2 is shown, the upper stage is explanatory drawing which shows a mechanism, and the lower stage is explanatory drawing which shows the definition of clearance. Explanatory drawing which shows the structure of the grinding | polishing waste removal apparatus 20 typically. Explanatory drawing which shows the structure of the warm water washing apparatus 30 typically. Explanatory drawing which shows the structure of the centrifugal dehydration drying apparatus 40 typically. It is explanatory drawing which shows the structure of the airflow sorter | selector 50 typically, (a) is a whole block diagram, (b) is replaced with any of the narrow cylinders (cylinder with a constant cross-sectional area) 512a-512c in (a). The fragmentary figure which shows the narrow cylinder 512e which is possible and whose cross-sectional area changes in a cylinder direction. Explanatory drawing which shows the structure of the different color resin removal apparatus 70 typically.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cleaning apparatus 20 Polishing waste removal apparatus 30 Hot water washing apparatus 40 Centrifugal dehydration drying apparatus 50 Air flow sorter 60 Metal removal apparatus 70 Different color resin removal apparatus

Claims (2)

A screw and a flow path regulating member are arranged in a horizontal cylindrical washing tank, and the flow path regulating member suppresses the progress while the resin piece and water supplied from one end of the washing tank are advanced by the screw. a cleaning device for discharging from the other end after repeating the rough surface of the cleaning tank to collide to cut the surface of the resin piece and,
A transport device having a transport surface member through which a large number of pores are penetrated and a watering device are provided, and the resin piece and water discharged from the other end of the cleaning tank of the cleaning device are received at the start end of the transport surface member. Polishing debris removal that sprays water on the transport surface member while spraying water in the form of a shower with a watering device and discharges resin pieces from the end portion, and discharges water from the numerous pores of the transport surface member through drain pipes Equipment,
A cleaning water circulation system for collecting water discharged through the drain pipe of the polishing debris removal apparatus and removing foreign matter, and then supplying one end of a cleaning tank of the cleaning apparatus and the watering device;
A screw is arranged in a horizontally disposed cylindrical cleaning tank, and hot water and a resin piece discharged from the terminal end of the conveying surface member of the polishing dust removing device are supplied at one end of the cleaning tank, A warm water rinsing device that advances while stirring with a screw and discharges from the other end;
The wings are arranged on the central rotating shaft in the vertically placed cylindrical centrifugal dewatering tank and the dewatering screen is arranged on the inner peripheral surface, and separated from the other end of the washing tank of the hot water washing apparatus. with a discharged the resin piece and the hot water was allowed to proceed playing a rotating vane to the collision is furuncle one above the dewatering screen received from the lower portion of the centrifugal dewatering tank without discharging the resin pieces from the top, from the water passing holes of the dehydration screen A centrifugal dehydrator that discharges hot water through a drainpipe ;
A hot water circulation system independent of the washing water circulation system, which collects the hot water discharged through the drainage pipe of the centrifugal dewatering device to remove foreign substances and supplies the heated water to one end of the washing tank of the warm water washing device. When,
Resin that forms a vertically placed cylinder , separates the resin pieces discharged from the centrifugal dehydrator into the cylinder , separates them using the flow velocity distribution in the cylinder direction of the upward air flow, and falls down the cylinder An airflow sorting device for collecting pieces,
A resin recycling system characterized by comprising: In claim 1 , further,
In the subsequent stage of the air flow sorting device,
A metal removing device that removes the metal piece by switching the conveyance destination of the detection portion when the metal piece mixed in the resin piece being conveyed is detected based on a change in eddy current;
And / or
A different color resin removing device that removes the different color resin by blowing off the detection portion when the different color resin mixed in the resin piece sliding down the slope is detected by the camera;
A resin recycling system characterized by providing

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