CN110552085A - polyester waste cloth and waste silk recycling system and recycling method thereof - Google Patents
polyester waste cloth and waste silk recycling system and recycling method thereof Download PDFInfo
- Publication number
- CN110552085A CN110552085A CN201810542109.6A CN201810542109A CN110552085A CN 110552085 A CN110552085 A CN 110552085A CN 201810542109 A CN201810542109 A CN 201810542109A CN 110552085 A CN110552085 A CN 110552085A
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- Prior art keywords
- waste
- melt
- polyester
- cloth
- screw extruder
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- 229920000728 polyester Polymers 0.000 title claims abstract description 179
- 239000002699 waste material Substances 0.000 title claims abstract description 150
- 239000004744 fabric Substances 0.000 title claims abstract description 89
- 238000004064 recycling Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 claims abstract description 46
- 238000006243 chemical reaction Methods 0.000 claims description 44
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 39
- 238000010438 heat treatment Methods 0.000 claims description 31
- 238000003756 stirring Methods 0.000 claims description 27
- 238000005086 pumping Methods 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 8
- 238000002207 thermal evaporation Methods 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 7
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 6
- 238000009987 spinning Methods 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 5
- 238000012856 packing Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 4
- 238000005265 energy consumption Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 238000000605 extraction Methods 0.000 description 4
- 238000010008 shearing Methods 0.000 description 3
- 229920000742 Cotton Polymers 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000005453 pelletization Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 210000003781 tooth socket Anatomy 0.000 description 2
- 238000009835 boiling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- -1 silt Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
- D01G11/00—Disintegrating fibre-containing articles to obtain fibres for re-use
- D01G11/04—Opening rags to obtain fibres for re-use
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/66—Disintegrating fibre-containing textile articles to obtain fibres for re-use
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The invention discloses a waste polyester cloth and waste silk recycling system, which comprises: the device comprises a conveying mechanism, a double-screw extruder, a first melt conveying gear pump, a homogenizing and tackifying reactor, a second melt conveying gear pump and a subsequent production device; the discharge end of the conveying mechanism is introduced into a feed hopper of the screw extruder through a conveying belt, the discharge end of the double screw extruder is connected with a first melt conveying gear pump through a pipeline, the outlet of the first melt conveying gear pump is connected with the inlet pipeline of the homogenizing and tackifying reactor, the outlet of the homogenizing and tackifying reactor is connected with the inlet pipeline of a second melt conveying gear pump, and the outlet of the second melt conveying gear pump is directly or indirectly connected with the inlet of a subsequent production device through a pipeline; wherein, two screws in the double screw extruder all are provided with a plurality of tooth covers on the section of just facing the entry of feeder hopper, and every tooth cover of the correspondence on two screws is mutually meshed. The invention also discloses a method for recycling the waste polyester cloth silk, which is used for the system for recycling the waste polyester cloth silk.
Description
Technical Field
The invention belongs to the field of polyester recovery processing, and particularly relates to a polyester waste cloth and waste silk recycling system and a polyester waste cloth and waste silk recycling method.
Background
the polyester fiber is a chemical fiber with the largest national usage amount, the quantity of waste polyester cloth and waste silk generated every year is also huge, and more attention has been paid to how to efficiently recycle the waste polyester cloth and waste silk and reduce the energy consumption of recovery processing. The existing main recycling modes of the waste polyester cloth and waste silk have two types: the first method is that the waste cloth and the waste silk are crushed and heated to 180-220 ℃, and then the waste cloth and the waste silk are contracted to be in a half-melting softening state, and then water is sprayed in a granulating machine for quenching to form granular particles, the granular particles are heated and vacuum-dried when being used by downstream manufacturers, and low-boiling substances and water in the granular particles are removed, and then the granular particles are sent into a screw extruder to be melted to be polyester melt and then supplied to a subsequent production device; the second method is to cut and crush the waste cloth and the waste silk, force the waste cloth and the waste silk into a screw extruder by a compactor to be melted into polyester melt, and supply the polyester melt to a subsequent production device. In the first method, the waste cloth and the waste silk are heated and melted into agglomerated granular particles, and then are heated, vacuum-dried and melted into polyester melt, in the above method, the energy consumption is very high after the waste cloth and the waste silk are heated for many times to the polyester melt, and after water is added in the process, the polyester melt is partially hydrolyzed, and the intrinsic viscosity of the polyester melt is reduced; in the second method, equipment for cutting and crushing the waste cloth and the waste silk and extrusion equipment for forcibly extruding the crushed material of the waste cloth and the waste silk into the screw extruder are required, so that the equipment investment requirement is high, and the equipment energy consumption is high.
Disclosure of Invention
In view of this, the first aspect of the present invention is to provide a system for recycling waste polyester fabric, which has a relatively simple structure, low requirement on equipment, low energy consumption, and high production efficiency. The second aspect of the invention aims to provide a method for recycling waste polyester cloth and waste silk, which is used for the system for recycling the waste polyester cloth and the waste silk.
The invention provides a recycling system of waste polyester cloth and waste silk, which comprises: the device comprises a conveying mechanism, a double-screw extruder, a first melt conveying gear pump, a homogenizing and tackifying reactor, a second melt conveying gear pump and a subsequent production device; the discharge end of the conveying mechanism is introduced into a feed hopper of the screw extruder through a conveying belt, the discharge end of the double-screw extruder is connected with a first melt conveying gear pump through a pipeline, the outlet of the first melt conveying gear pump is directly or indirectly connected with the inlet of the homogenizing and tackifying reactor through a pipeline, the outlet of the homogenizing and tackifying reactor is connected with the inlet of a second melt conveying gear pump through a pipeline, and the outlet of the second melt conveying gear pump is directly or indirectly connected with the inlet of a subsequent production device through a pipeline; the double-screw extruder is characterized in that a plurality of tooth sleeves are arranged on the sections, facing the inlet of the feed hopper, of the two screws, and each pair of corresponding tooth sleeves on the two screws are meshed with each other.
According to the recycling system of the waste polyester cloth and waste silk, the workers should keep the waste polyester cloth and waste silk clean, the waste polyester cloth and waste silk are flatly laid on the conveying belt of the conveying mechanism, the conveying mechanism conveys the waste polyester cloth and waste silk into the feed hopper of the double-screw extruder, the mutually staggered tooth sleeves on the two screws shear the waste polyester cloth and waste silk, meanwhile, a plurality of pairs of mutually meshed tooth sleeves on the two screws form an open-meshed circulation in the rapid rotation process, when each pair of tooth sleeves is opened, the waste polyester cloth and waste silk crushed aggregates enter, when each pair of tooth sleeves are meshed, the waste polyester cloth and waste silk crushed aggregates are extruded into the spiral cavity at the front end, the spiral pieces on the two screws generate a high-strength propelling effect in the high-speed rotation process, the waste polyester cloth and waste silk fragments are pushed into the double-screw extruder to be heated, stirred and conveyed, the steam and oil gas volatilized by the waste polyester cloth and waste silk crushed aggregates in the temperature rising process are removed through multi-section vacuum exhaust in the heating and conveying processes, so that the quality of polyester melt formed by melting the waste polyester cloth and waste silk is ensured. The polyester melt is extruded from the discharge end of the double-screw extruder and then enters the homogenizing tackifying reactor through the pipeline and the first melt conveying gear pump for tackifying reaction, and the polyester melt reaching specific viscosity flows out of the outlet of the homogenizing tackifying reactor and then is conveyed into a subsequent production device through the pipeline and the second melt conveying gear pump for production. The waste polyester cloth and waste silk recycling system has the advantages of compact structure, small quantity of required equipment and relatively low energy consumption, can improve the production rate of polyester melt generated by the waste polyester cloth and waste silk, and has high quality of the generated polyester melt.
The waste polyester cloth and waste silk recycling system provided by the invention also has the following optional characteristics.
Optionally, the cross-sectional profile of each gear sleeve is an ellipse or a prism with a round corner, and every two adjacent gear sleeves on the same screw are mutually at an included angle of 90 degrees.
According to the waste polyester cloth silk recycling system, the cross section outline of each gear sleeve is oval or prismatic with round corners, each pair of mutually meshed gear sleeves form a 90-degree included angle, when the two screws rotate, a large-angle shearing angle can be formed between the gear sleeve on each screw and other gear sleeves on two sides of the meshed gear sleeve on the other screw, and the waste polyester cloth silk can be effectively and quickly sheared.
Optionally, the homogenization and tackifying reactor comprises a horizontal reaction kettle, a stirring shaft is transversely arranged in the horizontal reaction kettle, a stirring disc is arranged on the stirring shaft, and the top of the horizontal reaction kettle is further connected with a vacuum condensation separation device.
According to the recycling system of the waste polyester cloth and waste silk, the kettle wall of the horizontal reaction kettle adopts gas-phase heating medium for heat tracing, the heating is more uniform, the stirring shaft in the horizontal reaction kettle cuts the polyester melt through the stirring disk, the bubble film of the polyester melt is damaged, the ethylene glycol steam is extracted, in the process of cutting the melt by the stirring disk, the polyester melt forms a hanging film on the disk, the polyester melt is overturned, the material interface is continuously updated, the ethylene glycol steam in the polyester melt can be extracted more quickly, the extraction path of the ethylene glycol steam is shortened, the molecular chain length of the polyester melt is continuously increased along with the extraction of the ethylene glycol steam, and the viscosity of the polyester melt is also continuously improved. Wherein, the vacuum condensation separation device continuously extracts the separated glycol steam out of the horizontal reaction kettle, so that a certain vacuum state is kept in the horizontal reaction kettle.
Optionally, a first melt filter is connected to a pipeline between the outlet of the first melt conveying gear pump and the inlet of the homogenizing and tackifying reactor; and a second melt filter is connected to a pipeline between the outlet of the second melt conveying gear pump and the inlet of the subsequent production device.
According to the polyester waste cloth and waste silk recycling system, the first melt filter is used for primarily filtering the polyester melt sent out from the double-screw extruder, filtering out a small amount of insoluble impurities such as cotton, silt and metal in the polyester melt, and sending the filtered polyester melt into the homogenizing and tackifying reactor; the second melt filter filters the tackified polyester melt sent out from the homogenizing tackification reactor more finely, so that the purity of the polyester melt is improved, and the polyester melt can be put into production in a subsequent production device.
Optionally, the subsequent production device comprises one or more of a recycled PET pelletizing device, a recycled PET spinning device, a recycled PET zipper wire device, a recycled PET strapping/cord device, and a recycled PET sheet device.
according to the polyester waste cloth and waste silk recycling system, the subsequent production device directly takes the tackified polyester melt as a raw material and can be divided into a regenerated PET grain cutting device, a regenerated PET spinning device, a regenerated PET zipper silk device, a regenerated PET packing belt/rope belt device, a regenerated PET sheet device and the like according to different production products.
The second aspect of the present invention provides a method for recycling waste polyester cloth and waste silk, which is used in the system for recycling waste polyester cloth and waste silk described in the above, and comprises the following steps: step 002: inputting waste cloth blocks and waste silk clusters into a feed hopper of a double-screw extruder through a conveying mechanism; step 004: the waste cloth blocks and the waste silk clusters are minced in a feed hopper of a double-screw extruder through a plurality of pairs of meshed gear sleeves on a pair of screws in the double-screw extruder and then enter a cylinder sleeve of the double-screw extruder; step 006: heating and pushing the waste cloth blocks and the waste silk clusters in a machine barrel sleeve of the double-screw extruder, simultaneously pumping out water vapor and oil gas volatilized in the temperature rising process of the waste cloth blocks and the waste silk clusters, extruding polyester melt formed by melting the waste cloth blocks and the waste silk clusters from an outlet of the double-screw extruder, and pumping the polyester melt into a horizontal kettle of a homogenizing and tackifying reactor; step 008: heating and stirring the polyester melt in a horizontal kettle, and simultaneously extracting glycol steam to enable the polyester melt to reach the required intrinsic viscosity; step 010: and pumping the homogenized and tackified polyester melt out of the horizontal kettle and then sending the polyester melt into a subsequent production device for production and processing.
In step 006, the polyester melt temperature at the outlet of the twin-screw extruder was 265-278 ℃.
In the step 008, when the intrinsic viscosity IV of the required polyester melt is less than or equal to 0.65dl/g, the heating temperature of the horizontal reaction kettle is 270-276 ℃; when the intrinsic viscosity IV of the required polyester melt is less than or equal to 0.65-0.68dl/g, the heating temperature of the horizontal reaction kettle is 275-281 ℃; when the intrinsic viscosity IV of the required polyester melt is less than or equal to 0.68-0.73dl/g, the heating temperature of the horizontal reaction kettle is 280-286 ℃; when the intrinsic viscosity IV of the required polyester melt is less than or equal to 0.73-0.78dl/g, the heating temperature of the horizontal reaction kettle is 285-292 ℃; when the intrinsic viscosity IV of the required polyester melt is more than 0.78dl/g, the horizontal reaction kettle is heated in a segmented manner, and the heating temperature of the front segment is 275-; the heating temperature of the rear section is 290-300 ℃.
In the step 008, when the intrinsic viscosity IV of the required polyester melt is less than or equal to 0.65dl/g under the condition that the viscosity of the polyester melt is increased by a certain range, the stirring rotating speed of the horizontal reaction kettle is 2.5-3.5 RPM; when the intrinsic viscosity IV of the required polyester melt is 0.65-0.70dl/g, the stirring speed of the horizontal reaction kettle is 1.5-2.5 RPM; when the intrinsic viscosity IV of the required polyester melt is more than or equal to 0.70dl/g, the stirring speed of the horizontal reaction kettle is less than 1.5 RPM.
In step 008, the vacuum pressure in the horizontal kettle is less than 100 Pa.
The method for recycling the waste polyester cloth silk mainly comprises the steps of directly feeding the waste polyester cloth silk into a feed hopper of a specially designed double-screw extruder through a conveying mechanism, shearing and extruding the waste polyester cloth silk by the double-screw extruder through a plurality of pairs of meshed gear sleeves on two screws of the double-screw extruder, and pushing crushed materials of the waste polyester cloth silk into a cylinder sleeve to be heated by spiral sheets on the two screws when the two screws rotate. Steam and oil gas volatilized when the crushed polyester materials are melted in a barrel sleeve of the double-screw extruder are extracted in sections, hydrolysis reaction of polyester melt formed by the crushed polyester waste cloth and waste silk is avoided, the quality of the polyester melt is guaranteed, the polyester melt passes through a discharge port of the double-screw extruder after reaching a preset temperature, the polyester melt is sent into a homogenizing and tackifying reactor through a first melt conveying gear pump to be heated, turned and stirred, meanwhile, ethylene glycol steam is extracted from the polyester melt, the molecular chain of the polyester melt is lengthened, and the polyester melt is sent into a subsequent production device for production after reaching a preset intrinsic viscosity. The method for recycling the waste polyester cloth silk saves special equipment for cutting and crushing the waste polyester cloth silk, does not need a compactor to forcibly feed the waste polyester cloth silk into a double-screw extruder, reduces energy consumption and equipment investment, and has short production flow, improved production efficiency and high product quality because the outlets and inlets of all main equipment are communicated through closed pipelines to carry out fully-closed conveying and processing treatment on the polyester melt.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic view of a connection structure of an embodiment of a waste polyester cloth and waste silk recycling system according to the present invention;
Fig. 2 is a partial structural schematic diagram of a feed hopper and a barrel sleeve of a twin-screw extruder in the waste polyester cloth and silk recycling system in fig. 1.
In the above figures: 1, a conveying mechanism; 2, a double-screw extruder; 201 a feed hopper; 210 screws; 211 a gear sleeve; 220, a cylinder sleeve; 3 a first melt delivery gear pump; 4 homogenizing and tackifying the reactor; 401 horizontal reaction kettle; 402 a stirring shaft; 403 stirring the disk; 404 vacuum condensation separation device; 5 a second melt delivery gear pump; 6 a subsequent production device; 7 a first melt filter; 8 second melt filter.
Detailed Description
referring to fig. 1 and 2, an embodiment of the first aspect of the present invention provides a waste polyester cloth filament recycling system, including: the device comprises a conveying mechanism 1, a double-screw extruder 2, a first melt conveying gear pump 3, a homogenizing and tackifying reactor 4, a first melt conveying gear pump 5 and a subsequent production device 6; the discharge end of the conveying mechanism 1 is introduced into a feed hopper 201 of the screw extruder through a conveying belt, the discharge end of the double-screw extruder 2 is connected with a first melt conveying gear pump 3 through a pipeline, an outlet of the first melt conveying gear pump 3 is directly or indirectly connected with an inlet of the homogenizing and tackifying reactor 4 through a pipeline, an outlet of the homogenizing and tackifying reactor 4 is connected with an inlet of the first melt conveying gear pump 5 through a pipeline, and an outlet of the first melt conveying gear pump 5 is directly or indirectly connected with an inlet of a subsequent production device 6 through a pipeline; wherein, two screws 210 in the double-screw extruder 2 are provided with a plurality of tooth sleeves 211 on the sections facing the inlet of the feed hopper 201, and each pair of corresponding tooth sleeves 211 on the two screws 210 are meshed.
In the above embodiment, the worker should keep the recycled waste polyester cloth yarn clean, lay the waste polyester cloth yarn on the conveying belt of the conveying mechanism 1, the conveying mechanism 1 feeds the waste polyester cloth yarn into the feed hopper 201 of the twin-screw extruder 2, the mutually staggered toothed sleeves 211 on the two screws 210 shear the waste polyester cloth yarn, meanwhile, the mutually meshed pairs of toothed sleeves 211 on the two screws 210 form an "open" -meshing "cycle in the process of fast rotation, the waste polyester yarn crushed aggregates enter when each pair of toothed sleeves 211 is open, the waste polyester yarn crushed aggregates enter when each pair of toothed sleeves 211 are meshed, the waste polyester cloth crushed aggregates are extruded into the spiral cavity at the front end, the spiral pieces on the two screws 210 generate a high-strength propelling action in the process of high-speed rotation, the waste polyester cloth yarn fragments are pushed into the twin-screw extruder 2 for heating, stirring and conveying, the steam and oil gas volatilized by the waste polyester cloth and waste silk crushed aggregates in the temperature rising process are removed through multi-section vacuum exhaust in the heating and conveying processes, so that the quality of polyester melt formed by melting the waste polyester cloth and waste silk is ensured. The polyester melt is extruded from the discharge end of the double-screw extruder 2 and then enters the homogenizing tackifying reactor 4 through the pipeline and the first melt conveying gear pump 3 for tackifying reaction, and the polyester melt reaching specific viscosity flows out of the outlet of the homogenizing tackifying reactor 4 and then is sent into the subsequent production device 6 through the pipeline and the second melt conveying gear pump 5 for production. The waste polyester cloth and waste silk recycling system has the advantages of compact structure, small quantity of required equipment and relatively low energy consumption, can improve the production rate of polyester melt generated by the waste polyester cloth and waste silk, and has high quality of the generated polyester melt.
Referring to fig. 2, according to an embodiment of the present invention, each of the tooth sockets 211 has an oval cross-sectional profile or a prismatic profile with rounded corners, and each two adjacent tooth sockets 211 on the same screw 210 are at an angle of 90 ° with respect to each other.
In the above embodiment, the cross-sectional profile of each toothed sleeve 211 is oval or prismatic with rounded corners, and each pair of meshed toothed sleeves 211 mutually form an included angle of 90 degrees, when two screws 210 rotate, a large-angle shearing angle can be formed between the toothed sleeve 211 on each screw 210 and other toothed sleeves 211 on two sides of the meshed toothed sleeve 211 on the other screw 210, so that waste polyester cloth yarns can be effectively and quickly sheared.
Referring to fig. 1, according to an embodiment of the present invention, the homogenizing and tackifying reactor 4 includes a horizontal reaction kettle 401, an agitating shaft 402 is transversely disposed in the horizontal reaction kettle 401, an agitating disk 403 is disposed on the agitating shaft 402, and a vacuum condensation separation device 404 is further connected to the top of the horizontal reaction kettle 401.
In the above embodiment, the kettle wall of the horizontal reaction kettle 401 adopts gas-phase heating medium for heat tracing, the heating is more uniform, the stirring shaft in the horizontal reaction kettle 401 cuts the polyester melt through the stirring disk 403, the bubble film of the polyester melt is damaged, and the ethylene glycol steam is extracted, and in the process of cutting the melt, the polyester melt forms a film on the stirring disk 403, and meanwhile, the polyester melt is tumbled, the material interface is continuously updated, so that the ethylene glycol steam in the polyester melt can be extracted more quickly, the extraction path of the ethylene glycol steam is also shortened, and with the extraction of the ethylene glycol steam, the molecular chain length of the polyester melt is continuously increased, and the viscosity of the polyester melt is also continuously improved. Wherein, the vacuum condensation separation device continuously extracts the separated glycol vapor out of the horizontal reaction kettle 401, so that a certain vacuum state is kept in the horizontal reaction kettle 401.
Referring to fig. 1, a first melt filter 7 is connected to a pipe between an outlet of the first melt delivery gear pump 3 and an inlet of the homogenizing viscosity increasing reactor 4 according to an embodiment of the present invention; a second melt filter 8 is connected to the pipeline between the outlet of the first melt delivery gear pump 5 and the inlet of the downstream production device 6.
in the above embodiment, the first melt filter 7 primarily filters the polyester melt discharged from the twin-screw extruder 2 to remove a small amount of impurities such as cotton, silt, metal and the like which are mixed in the polyester melt, and the filtered polyester melt is fed into the homogenizing and tackifying reactor 4; the second melt filter 8 filters the tackified polyester melt discharged from the homogenizing tackification reactor 4 more finely, so that the purity of the polyester melt is improved, and the polyester melt can be put into production in the subsequent production device 6.
According to an embodiment of the invention, the subsequent production device 6 comprises one or more of a recycled PET pelletizing device, a recycled PET spinning device, a recycled PET zipper filament device, a recycled PET strapping/cord device and a recycled PET sheet device.
In the above embodiment, the subsequent production apparatus 6 directly uses the tackified polyester melt as a raw material, and can be divided into a recycled PET granulating apparatus, a recycled PET spinning apparatus, a recycled PET zipper wire apparatus, a recycled PET packing belt/strap apparatus, a recycled PET sheet apparatus, and the like according to the difference of the products to be produced.
The embodiment of the second aspect of the present invention provides a method for recycling waste polyester cloth and waste silk, which is used in the system for recycling waste polyester cloth and waste silk described in the above, and comprises the following steps:
Step 002: inputting waste cloth blocks and waste silk clusters into a feed hopper 201 of a double-screw extruder 2 through a conveying mechanism 1; step 004: the waste cloth pieces and the waste silk clusters are minced in a feed hopper 201 of the double-screw extruder 2 through a plurality of pairs of meshed tooth sleeves 211 on a pair of screws 210 in the double-screw extruder 2 and then enter a machine barrel sleeve 220 of the double-screw extruder 2;
step 006: heating and pushing the waste cloth blocks and the waste silk clusters in the machine barrel sleeve 220 of the double-screw extruder 2, wherein the electric heating temperature of the machine barrel sleeve 220 is generally controlled at 210-; then pumping the polyester melt into a horizontal kettle of a homogenizing and tackifying reactor 4 by a first melt conveying gear pump 3; the polyester melt is filtered through a first melt filter 5 before being pumped into the homogenizing viscosity reactor 4.
Step 008: heating and stirring the polyester melt in the horizontal kettle to repolymerize the polyester melt and remove glycol steam, connecting a vacuum condensation separation device 404 on the horizontal kettle, vacuumizing the horizontal kettle by the vacuum condensation separation device 404 to ensure that the vacuum pressure in the horizontal kettle is less than 100Pa, and continuously pumping out the glycol steam until the polyester melt in the horizontal kettle reaches the required intrinsic viscosity.
When the intrinsic viscosity IV of the required polyester melt is less than or equal to 0.65dl/g, the heating temperature of the horizontal reaction kettle 401 is 270-276 ℃; when the intrinsic viscosity IV of the required polyester melt is less than or equal to 0.65-0.68dl/g, the heating temperature of the horizontal reaction kettle 401 is 275-281 ℃; when the intrinsic viscosity IV of the required polyester melt is less than or equal to 0.68-0.73dl/g, the heating temperature of the horizontal reaction kettle 401 is 280-286 ℃; when the intrinsic viscosity IV of the required polyester melt is less than or equal to 0.73-0.78dl/g, the heating temperature of the horizontal reaction kettle 401 is 285-292 ℃; when the intrinsic viscosity IV of the required polyester melt is more than 0.78dl/g, the horizontal reaction kettle 401 is heated in sections, and the heating temperature of the front section is 275-; the heating temperature of the rear section is 290-300 ℃.
Under the condition that the viscosity of the polyester melt is increased to a certain extent, when the intrinsic viscosity IV of the required polyester melt is less than or equal to 0.65dl/g, the stirring rotating speed of the horizontal reaction kettle 401 is 2.5-3.5 RPM; when the intrinsic viscosity IV of the required polyester melt is 0.65-0.70dl/g, the stirring speed of the horizontal reaction kettle 401 is 1.5-2.5 RPM; when the intrinsic viscosity IV of the required polyester melt is more than or equal to 0.70dl/g, the stirring speed of the horizontal reaction kettle 401 is less than 1.5 RPM.
Step 010: pumping the homogenized and tackified polyester melt out of the horizontal kettle and then sending the polyester melt into a subsequent production device 6 for production and processing; the polyester melt is filtered through a second melt filter 8 before being pumped into the subsequent production device 6. When the subsequent production device 6 is a regenerated PET grain cutting device, the polyester melt is pulled into strips and cut into grains; when the subsequent production device 6 is a regenerated PET spinning device, the polyester melt is directly spun; when the subsequent production device 6 is a regenerated PET zipper wire device, the polyester melt is pulled into strips to produce zipper wires; when the subsequent production device 6 is a recycled PET packing belt/cord device, the polyester melt is drawn to produce the packing belt/cord.
The above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a polyester waste cloth waste silk system of recycling which characterized in that includes: a conveying mechanism (1), a double-screw extruder (2), a first melt conveying gear pump (3), a homogenizing and tackifying reactor (4), a second melt conveying gear pump (5) and a subsequent production device (6); the discharge end of the conveying mechanism (1) is introduced into a feed hopper (201) of the screw extruder (2) through a conveying belt, the discharge end of the double screw extruder (2) is in pipeline connection with the first melt conveying gear pump (3), the outlet of the first melt conveying gear pump (3) is in direct or indirect pipeline connection with the inlet of the homogenizing and tackifying reactor (4), the outlet of the homogenizing and tackifying reactor (4) is in pipeline connection with the inlet of the second melt conveying gear pump (5), and the outlet of the second melt conveying gear pump (5) is in direct or indirect pipeline connection with the inlet of a subsequent production device (6); wherein, two screws (210) in the double-screw extruder (2) are provided with a plurality of toothed sleeves (211) on the sections facing the inlet of the feed hopper (201), and each pair of corresponding toothed sleeves (211) on the two screws (210) are meshed.
2. The system for recycling the waste polyester cloth yarns as claimed in claim 1, wherein the cross-sectional profile of each gear sleeve (211) is oval or prismatic with round corners, and every two adjacent gear sleeves (211) on the same screw (210) form an included angle of 90 degrees with each other.
3. The waste polyester cloth silk recycling system of claim 1, wherein the homogenizing and tackifying reactor (4) comprises a horizontal reaction kettle (401), a stirring shaft (402) is transversely arranged in the horizontal reaction kettle (401), a stirring disc (403) is arranged on the stirring shaft (402), and the top of the horizontal reaction kettle (4) is further connected with a vacuum condensation separation device (404).
4. the system for recycling the waste polyester cloth yarns as claimed in claim 1, wherein a first melt filter (7) is connected to a pipeline between the outlet of the first melt delivery gear pump (3) and the inlet of the homogenizing and tackifying reactor (4); a second melt filter (8) is connected to a pipeline between the outlet of the second melt delivery gear pump (5) and the inlet of the subsequent production device (6).
5. The system for recycling waste polyester cloth yarns according to claim 1, wherein the subsequent production device (6) comprises one or more of a recycled PET grain cutting device, a recycled PET spinning device, a recycled PET zipper yarn device, a recycled PET packing belt/cord device and a recycled PET sheet device.
6. A method for recycling waste polyester cloth yarns, which is used in the waste polyester cloth yarn recycling system of claims 1 to 5, and is characterized by comprising the following steps:
step 002: inputting waste cloth blocks and waste silk clusters into a feed hopper of a double-screw extruder through a conveying mechanism;
Step 004: the waste cloth blocks and the waste silk clusters are minced in a feed hopper of a double-screw extruder through a plurality of pairs of meshed gear sleeves on a pair of screws in the double-screw extruder and then enter a cylinder sleeve of the double-screw extruder;
Step 006: heating and pushing the waste cloth blocks and the waste silk clusters in a machine barrel sleeve of the double-screw extruder, simultaneously pumping out water vapor and oil gas volatilized in the temperature rising process of the waste cloth blocks and the waste silk clusters, extruding polyester melt formed by melting the waste cloth blocks and the waste silk clusters from an outlet of the double-screw extruder, and pumping the polyester melt into a horizontal kettle of a homogenizing and tackifying reactor;
Step 008: heating and stirring the polyester melt in a horizontal kettle, and simultaneously extracting glycol steam to enable the polyester melt to reach the required intrinsic viscosity;
Step 010: and pumping the homogenized and tackified polyester melt out of the horizontal kettle and then sending the polyester melt into a subsequent production device for production and processing.
7. The method as claimed in claim 6, wherein the temperature of the polyester melt at the outlet of the twin-screw extruder in step 006 is 265-278 ℃.
8. The method for recycling the waste polyester cloth yarns as claimed in claim 6, wherein in the step 008, when the intrinsic viscosity IV of the required polyester melt is less than or equal to 0.65dl/g, the heating temperature of the horizontal reaction kettle is 270-276 ℃; when the intrinsic viscosity IV of the required polyester melt is less than or equal to 0.65-0.68dl/g, the heating temperature of the horizontal reaction kettle is 275-281 ℃; when the intrinsic viscosity IV of the required polyester melt is less than or equal to 0.68-0.73dl/g, the heating temperature of the horizontal reaction kettle is 280-286 ℃; when the intrinsic viscosity IV of the required polyester melt is less than or equal to 0.73-0.78dl/g, the heating temperature of the horizontal reaction kettle is 285-292 ℃; when the intrinsic viscosity IV of the required polyester melt is more than 0.78dl/g, the horizontal reaction kettle is heated in stages, and the heating temperature of the front section is 275-; the heating temperature of the rear section is 290-300 ℃.
9. The method for recycling the waste polyester cloth yarns as claimed in claim 8, wherein the stirring speed of the horizontal reaction kettle is 2.5-3.5RPM when the intrinsic viscosity IV of the required polyester melt is less than or equal to 0.65dl/g under the condition that the viscosity of the polyester melt is increased in a certain range; when the intrinsic viscosity IV of the required polyester melt is 0.65-0.70dl/g, the stirring speed of the horizontal reaction kettle is 1.5-2.5 RPM; when the intrinsic viscosity IV of the required polyester melt is more than or equal to 0.70dl/g, the stirring speed of the horizontal reaction kettle is less than 1.5 RPM.
10. The recycling method of waste polyester cloth and silk as claimed in claim 6, wherein the vacuum pressure in the horizontal kettle is less than 100 Pa.
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| CN201810542109.6A CN110552085A (en) | 2018-05-30 | 2018-05-30 | polyester waste cloth and waste silk recycling system and recycling method thereof |
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