CN1978503A - Production process for manufacturing food-level polyester bottle flakes utilizing polyester recovered bottles - Google Patents
Production process for manufacturing food-level polyester bottle flakes utilizing polyester recovered bottles Download PDFInfo
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- CN1978503A CN1978503A CNA2006101571458A CN200610157145A CN1978503A CN 1978503 A CN1978503 A CN 1978503A CN A2006101571458 A CNA2006101571458 A CN A2006101571458A CN 200610157145 A CN200610157145 A CN 200610157145A CN 1978503 A CN1978503 A CN 1978503A
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Abstract
This invention discloses a production technology for producing the food-grade polyester bottle slices by utilizing the restored polyester bottles. According the characteristics of restored PET bottle, the restored polyester bottles were washed firstly and pulverized to slices, then the PVC bottle bodies, the volume labels, the impurities and the foreign materials were wiped off. Secondly, according the species of the residuum, the removing technology of the corresponding trace impurity was used. So the trace impurities of PVC, PP, PE and the other mechanical impurities can be removed again. The residuum of the restored PET bottle can be cut down greatly. Finally, the solid phases were condensed together so as to obtain the food-grade polyester bottle slices. Because of using the restored polyester bottles, the production cost is low, and the production technology meet the circulating economical development idea which advocated by the country nearly. The quality of the reproduction accords with the national standards of the food-grade PET bottle. The foreign exchange of the production technology is high and the economic effects as well as the social effects are obvious.
Description
[technical field]
The present invention relates to a kind of polyester bottle slice production technique, particularly the polyester returnable bottle is made the production technique of food grade polyester bottle slice.
[background technology]
PET (polyester) is main chemical fibre raw material, and because of its superior physical property, PET has more extensive on packing timber and the more application of high additive value.Edible wrapped slice and edible beverage bottle promptly are actual illustrations.
The subject under discussion that the two big universes that save based on environment protection and natural resources pay close attention to, the reclaiming technology of using back PET bottle from last century the seventies begun rudiment.The early stage reclaiming bottle piece of producing, to satisfy the short fiber raw materials requirement as starting point, the technologic improvement development that continues all is to stride forward towards being reduced in of impurity retention rate, the total impurities rate by 500/1000000ths early stage (500PPM) to 200PPM to 100PPM even 50PPM; The scope of using from the short fiber to the monofilament (Mono fiber) to strap (Bale Strip) to thin slice (Sheet) even also can bottle blowing.Also trend as can be seen thus, that is exactly that the purity of the high more industry demand reworked material of value added is high more.
The moiety of PET bottle:
| Project | Parameter |
| Color (heterochromatic bottle) | ＜2％ |
| Label | PP/PE/PVC/ paper |
| Bottle cap | PP/HDPE |
| Glue | The EVA/ hot melt adhesive |
The high-quality measuring bottle sheet of being produced by mechanical type wash bottle line, with regard to the PET rerum natura in essence with regard to, be recycled for the bottle blowing raw material be feasible.But it can not be by the outpost of the tax office of inspection for food hygiene, and reason is that the visual trace level chemical substance that can't discover is residual.The residual angle from analysis of this class is not the surface that is only limited to bottle sheet, because PET has the surface property of small pore, the organic substance of small molecular weight is to have an opportunity to be penetrated into the PET internal layer, and these materials that penetrate into pore are to remove in the mode that machinery cleans.For making the returnable bottle sheet can directly be used in the target of edible bottle, must further deep processing, its topmost purpose is exactly to remove the trace organic substance that has permeated the PET internal layer.
[summary of the invention]
Main purpose of the present invention is: the production technique that provides a kind of environmental protection, recovery polyester bottles efficient, that product performance can reach the food grade standard to cut into slices.
For achieving the above object, the present invention proposes a kind of production technique of utilizing the polyester returnable bottle to make the food grade polyester bottle slice, comprise the steps:
1) cleans, pulverizes in blocks, impurity separation to reclaiming polyester bottles;
2) trace impurity that reclaims in the polyester bottle slice is removed;
3) solid phase polycondensation tackify process.
Above-mentioned production technique, described step 2) comprise the steps:
21) the polyester bottles fragment is reclaimed in fusing, and polythene PE, polyvinylchloride, the polypropylene PP pyrolysis gasification of trace are discharged;
22) use additive to carry out modification;
23) use filter plant that melt is filtered, the carbide of mechanical impurity, ring-type colloid and degraded is removed;
24) granulation output.
Above-mentioned production technique, described step 1) comprises the steps:
11) washing, 12) the polyvinylchloride label divests 13) label separates 14) pulverize in flakes 15) develop a film 16) hydrophily Jie's gravity separation impurity, 17) dehydrate 18) cyclonic separation impurity.
Above-mentioned production technique, described step 3) comprises the steps:
31) pre-crystallization, 32) crystallization, 33) preheating, 34) earnestly sheet conveying, 35) solid phase polycondensation, 36) polyester slice cooling output; Wherein said step 35) detailed process comprises: determine PET viscosity central value, by the online sampling analysis viscosity of Controlling System, the feedback regulation processing parameter makes the deviation of viscosity reach minimum.
Above-mentioned production technique, described step 21) the middle multiple screw extruder that adopts, carry out segmentation temperature, pressure, residence time control, at first section the polyvinylchloride pyrolysis gasification of trace is discharged; Second section discharges the polyvinylchloride of trace, polypropylene PP pyrolysis gasification.Described step 22) additive that adopts in comprises stablizer, and its effect is to prevent degraded and viscosity homogenizing; Can also add toning, heat absorption, uvioresistant, improve one or more of additives such as crystallization.Further, described step 21) in, the temperature of first section control is at 150--200 ℃, and pressure is about absolute pressure 300mbar, and the residence time is 9-25 minute; Second section temperature is at 250--280 ℃, and pressure-controlling is about absolute pressure 150mbar, and the residence time is 6-16 minute.Described step 22) in, temperature is controlled at 280--310 ℃, pressure-controlling gauge pressure 100Kg/cm
2Below, the residence time is between 5-12 minute.
Above-mentioned production technique is in the described step 1), in step 18) before or after, the involving vibrations separating step gone back: PET bottle sheet is being separated residual non-PET impurity in the process that next unit is carried by the vibration separating unit.In the described step 1), in step 18) before or after, also comprise optics PVC separating step: adopt optics PVC separating device that residual PVC is separated.In the described step 1), between step 13) and step 14), also comprise step 14 ') bottle screening: screen out the residual a spot of foreign matter down in each unit of front end, comprise heterogeneous bottle class, heterochromatic bottle class, small numbers of tags bits, metal reactant, rubbish etc.
Above-mentioned production technique, described step 16) concrete grammar of hydrophily Jie's gravity separation is: pulverize back blended fragment, utilize the difference of PET and PP, high-pressure polyethylene LDPE proportion, with water is media, PET fragment precipitation, PP, LDPE fragment come-up make the PET fragment reach purification effects again.Described step 18) method of cyclonic separation is: dried bottle sheet is through Cyclonic separating apparatus, and impurity such as the powder that remains in bottle sheet, paper scrap are separated.
Simultaneously, the present invention proposes a kind of polyester returnable bottle Impurity removal method, comprise the steps:
121) clean, pulverize in blocks, impurity separation to reclaiming polyester bottles;
122) the polyester bottles fragment is reclaimed in fusing, and polythene PE, polyvinylchloride, the polypropylene PP pyrolysis gasification of trace are discharged;
123) use additive to carry out modification;
124) use filter plant that melt is filtered, the carbide of mechanical impurity, ring-type colloid and degraded is removed.
Impurity removal method in the above-mentioned recovery polyester bottles, described step 122) the middle multiple screw extruder that adopts, carry out segmentation temperature, pressure, residence time control, first section control the polyvinylchloride pyrolysis gasification of trace is discharged; Second section control is discharged the polyvinylchloride of trace, polypropylene PP pyrolysis gasification.Described step 123) additive comprises stablizer described in, and its effect is to prevent degraded and viscosity homogenizing; Can also add toning, heat absorption, uvioresistant, improve one or more of additives such as crystallization.
Above-mentioned Impurity removal method, the temperature of first section control are at 150--200 ℃, and pressure is about absolute pressure 300mbar, and the residence time is 9-25 minute; Second section temperature is at 250--280 ℃, and pressure-controlling is about absolute pressure 150mbar, and the residence time is 6-16 minute.Described step 123) in, temperature is controlled at 280--310 ℃, pressure-controlling gauge pressure 100Kg/cm
2Below, the residence time is between 5-12 minute.
Pulverize the back cleaning earlier relatively with of the prior art, at the characteristic that reclaims the PET bottle, it is as follows that the recovery polyester bottles cleaning among the present invention has advantage:
1. can effectively remove PVC bottle and label, make that PVC content is lower than 25ppm in the product.
2. can remove impurity and pollution more than 90% in the process of wash bottle, the manpower of separation operation be can significantly reduce, or also can improve tolerance range when upgrading to automatic sorting system, promptly reduce the investment cost of upgrading.
3. because of last identical reason, make follow-up operational outfit safer and increase the service life.
4. technological process when facing bigger raw material of otherness and final product quality classification, has preferable adaptation elasticity according to functional discriminating module unit.
Because production technique of the present invention is at the residuals that reclaims the PET bottle, set up corresponding trace impurity and removed technology, further remove PVC, PP, PE and other the mechanical impurity of trace, the residuals that reclaims the PET bottle is significantly reduced, make it finally can produce the section of food level PET.
Because production technique of the present invention, clean to from raw material and to obtain qualified food grade bottle sheet at last, can in a Production Flow Chart, finish continuously, production efficiency is greatly improved, and production cost is further reduced.
Because use polyester reclaiming material production, production cost is low, environmental protection also meets the recycling economy development thought that country advocates at present, and the reconstituted product quality meets the national standard of food level PET bottle, the added value height, and economic benefit and social benefit are very remarkable.
[description of drawings]
Fig. 1 is that the present invention reclaims polyester (PET) bottle cleaning process flow figure,
Fig. 2 is the process flow sheet that trace impurity of the present invention is removed,
Fig. 3 is a bottle level solid phase polycondensation process schema of the present invention.
[embodiment]
The production technique that recovery polyester of the present invention (PET) bottle is produced food polyester (PET) bottle grade pet chip mainly comprises:
One, reclaims polyester (PET) bottle cleaning, please refer to accompanying drawing 1.
1, unpacks and washs the unit
Under powerful whipping force, bottle washing machine has had the function of separating chartered plane concurrently, makes flow process more succinct and economical.Under the effect in conjunction with the chemical force of mechanical force, washing composition and heating power, the separation and the clearance of the contained impurity of PET returnable bottle (finger ring environment pollution thing and label etc., but do not comprise PVC pyrocondensation label) are reached more than 90 percent.Follow-up with this understanding flow sheet equipment also obtains suitable protection because of the purification of bottle, especially in the environment of pulverizer, avoids producing unnecessary wearing and tearing because of too much pollutent.
2, buffering and dosing unit
Connect the bottle washing machine and the follow-up flow process of working continuously of batch operation, stablize the flow of flow process, and the variable work output demand with the cooperation production management is provided.
3, the PVC label divests the unit
At reluctant PVC label problem, adopt under the processing of label stripping machine, can effectively divest the PVC label on the bottle.When containing PVC label bottle above the environment more than 20%, this element is included the main line processing procedure in, is lower than 20% and can be located at the branch line processing.
4, label separating unit
Utilize between the effect and bottle and label of gravity and buoyancy the difference of " mass/area than ", remove the label that has separated but still mixed mutually with bottle.
5, bottle screening unit
Bottle final category filter before pulverizing screens out the residual a spot of foreign matter down in each unit of front end (comprising heterogeneous bottle class, heterochromatic bottle class, small numbers of tags bits, metal reactant, rubbish etc.).In returnable bottle class simple (referring to that single material color accounts for more than 85%) or the relatively low area of human cost, can the artificial screening mode be provided with.Replace otherwise can consider to be provided with full-automatic screening facility, full-automatic screening is detected the bottle of different colours or unlike material with optical module (containing infrared rays and X ray) reaction signal, and the signal feedback screens out with machinery and aerodynamic force is responded to bottle.
6, branch line unit
Among input PET bottle material, different colours or with serious pollution bottle have often been comprised.This unit can be directly and the bottle of main line screening unit couple together, heterochromatic bottle is done is immediately handled.Come out and drop into chute when heterochromatic bottle is selected, they will be delivered directly to pulverizer, flotation cell and water extracter.This unitary advantage is reloaded in saving, shut-down and cleaning product line cost.In addition, also can further guarantee to reduce the risk that the clear vial sheet mixes variegated.
7, pulverize the unit
The PET bottle is crushed into fragment, and it is smooth and easy to have a pan feeding, and output is stable, and it is low to consume energy, and the vibrating noise value is low, and structure is strong, and maintenance cost is low, characteristics such as long service life.
8, the unit of developing a film
After cell processes, its total impurities content has reached the quality scope that is lower than 200ppm to PET bottle sheet on finishing.Heal at the quality of downstream market requirement PET reclaiming bottle piece and to become harsh, this unitary purpose is the final purification of PET bottle sheet.Utilize three big cleaning function power: mechanical force, washing composition chemical force and heating power make the total impurities content of PET bottle sheet be reduced to 100ppm (ten thousands'/) scope.
9, hydrophily Jie gravity separation unit
Bottle is the bottle cap with PP or LDPE material when pulverizing, pulverize back blended fragment, utilize the difference (about 1.3/ about 0.8) of PET and PP, high-pressure polyethylene LDPE proportion, proportion is that 1 water is media, PET fragment precipitation, PP, LDPE fragment come-up make the PET fragment reach purification effects again, promptly reach the standard of product after PP, the dehydration of LDPE fragment are collected.
10, dehydrate the unit
Cooperate the heating power drying through dehydration equipment, the water ratio of bottle sheet can reach in 1%.
11, vibration separating unit
Be separated in by a vibration PET bottle sheet is separated residual non-PET impurity (as: sandstone, metal etc.) in the process that next unit is carried once more.
12, optics PVC separating unit
By the optics PVC separating device that adopts U.S. NRT company residual PVC is separated, make PVC content less than 20ppm.
13, cyclonic separation unit
Make dried bottle sheet through custom-designed Cyclonic separating apparatus, impurity such as the powder that remains in bottle sheet, paper scrap are separated, to alleviate former charge bridge and the uppity problem of viscosity (IV) in the SSP process.
More than the order of 11,12,13 3 steps can arrange transposing arbitrarily.
14, lotion circulation and treatment system
The main component of clean-out system is sodium hydroxide or potassium hydroxide, and general tackiness agent all is to be tart ester class organic compound, neutralization reaction takes place under certain conditions and hydrolysis reaction makes tackiness agent and impurity fall from the pet sheet emaciated face with basic solvent.Because the diversity of returnable bottle, making tackiness agent also is plurality of specifications, needs suitably to adjust the prescription of scavenging solution.The drops of washing that the present invention allocates in view of the above has strong clean power, low foaming, and residual quantity is low, is easy to characteristics such as wastewater treatment.Lotion operates in closed cycle system, and system configuration self-cleaning facility is kept the cleanliness of lotion.Timely and appropriate discovery adds prescription and keeps lotion concentration, guarantees the effect of washing.Wash the repeated use that unitary water for cleaning is the stage, the water yield of consumption is reduced significantly.
Through above-mentioned returnable bottle cleaning, the clean flinders of polyester (PET) can reach the quality standard as following table: PPM (ppm-parts per million)
| Project | Parameter |
| Viscosity | 0.72～0.78dl/g (this technology can not exert an influence to viscosity) |
| Packed bulk density (min./ave./max.) | 550/600/650 Kg/m 3 |
| Size | 12mm/10mm/9mm |
| Fragment≤1mm | ＜1％ |
| Fragment＞setting size | ＜3％ |
| Moisture content | ≤1％ |
| PE，PP | ≤20ppm |
| Paper | ≤20ppm |
| Viscose, hot melt adhesive | ≤20ppm |
| Organism | ≤20ppm |
| Metal | ≤20ppm |
| Inorganics | ≤20ppm |
| PVC | ≤25ppm |
| Total impurities content | ≤100ppm |
Two, the removal of trace impurity.
After the above-mentioned full bottle cleaning process of the PET bottle process that reclaims, major impurity is removed substantially, further removes micro-PVC, PP, PE and other mechanical impurity by subsequent process, and its technical process please refer to shown in Figure 2.The control techniques of the removal of impurity and viscosity mainly is made of three parts: 1. specialized apparatus and special process flow process and parameter are got rid of the trace P VC of system, PP, PE; 2. Zhuan Yong filter plant is the contaminant filter more than the certain condition; 3. the technology controlling and process of additive by special prescription and SSP reaches the index of product viscosity.
1, treated PET enters multiple screw extruder
This multiple screw extruder adopts three sections controls: first section temperature be at 150--200 ℃, and pressure-controlling makes the PVC pyrolysis gasification of trace, discharge system by the control of temperature, pressure and the residence time about absolute pressure 300mbar.Second section temperature be at 250--280 ℃, and pressure-controlling makes PE, the PP pyrolysis gasification of trace, discharge system by the control of temperature, pressure and the residence time about absolute pressure 150mbar.The 3rd section temperature be at 280--310 ℃, a few to tens of kilogram/cm of pressure-controlling gauge pressure
2,, and add the viscosity homogenizing that the additive that makes special prescription makes product by the control of temperature, pressure and the residence time.First section, second section, the 3rd section Residence Time Distribution ratio approximately is at 3: 2: 1.5, and total time is between 20-50 minute.It is all multifactor to relate to output, raw material composition etc., can regulate and control temperature, pressure and time.
Additive mainly adopts 1. general class of two big classes: stablizer, its effect are to prevent degraded and viscosity homogenizing; 2. dedicated classes: toning, heat absorption, uvioresistant, the purposes such as crystallization of improving.Inlet is in a few to tens of PPm scopes.The additive form has liquid, master batch and pressed powder etc.
2, Zhuan Yong filter plant filters:
Adopt special fusant filtering equipment that the carbide of the mechanical impurity that may exist, ring-type colloid and degraded is removed.Filtering material adopts the metal sintering material about 20 μ, uses behind the multilayer build-up.After surpassing certain numerical value, pressure can automatically switch.This material and facility market can be got,
3, granulation output: the melt through contaminant filter can adopt noncrystalline and crystallization granulation.
Three, polyester (PET) reclaims noncrystalline section solid phase polycondensation tackify (SSP) process
By oxygen level, hydrocarbons content, Catalytic processes control and online viscosity controller, produce qualified food grade polyester slice.Its technical process please refer to shown in Figure 3.
1, the delivery system of noncrystalline section
Noncrystalline section by aforementioned operation output is carried by pulse, delivers to the storage bin of SSP system, uses for the solid phase polycondensation workshop, and its feeding process is subjected to the control of charge level controller.
2, pre-crystal system
Because the interpolation of m-phthalic acid (IPA) in the PET bottle grade pet chip polymerization process makes the fusing point of section reduce, crystallization rate descends, and needs the degree of crystallinity that reaches certain in the past and is heated to temperature of reaction entering the SSP reactor.Adopt pre-crystallizer, make section be able to continuous high quality and pre-equably crystallization, in pre-crystallisation process, section is sent into pre-crystallizer by turning valve, gas enters with fluidizing velocity in pre-crystallizer, make initiate section rapidly by crystalline section encirclement in advance, prevented caking, make the material smoothness.
Pre-heat of crystallization air circulating system keeps the constant optimum Preheating Temperature by blower fan circulation air-supply and heater heats control, and recirculated air is taken away dust, and is removed in cyclonic separator.
Recirculated air will carry out continuously a small amount of discharging, and to prevent that humidity is excessive or dust is too much, the gas of discharging is able to balance by replenishing fresh air.
3, crystal system
The degree of crystallinity of the section of process pre-crystallizer is low, and inhomogeneous, thus must through fluidized-bed its degree of crystallinity be improved again, and the degree of crystallinity of agreeing, for next process is got ready.
The heat of crystallization air circulating system is the same with pre-crystal system, be closed circuit circulatory system, system airflow power is supplied with by blower fan, enter in the crystallizer after the heating of air-flow heater via, two the pulse continuous rotation of plates and the inclination meshes of web plate by 90 degree of phase phasic difference in the crystallizer, mode with pulse enters the bed of material, reach fluidisation, the suspended state of section in crystallizing bed, air-flow reenters blower fan and recycles then, and the dust of taking out of from the section bed of material falls in the dust charging basket after by cyclonic separator.One bypass pipe road is housed at the fan outlet place, and the wet air that contains that concentration is higher is discharged, and expellant gas is able to balance by replenishing fresh air.
4, pre-heating system
Preheater is sent in section after the crystallization, in preheater, pass through from the nitrogen in the polycondensation tower through filtering, by blower fan circulation air-supply and the control of well heater zone heating, feasible section is heated near solid phase polycondensation temperature, and remove and be mingled with gas and oxygen, preheater uses a horizontal louvered structure, makes nitrogen uniform distribution in well heater, reduce the influence of gravity, and reduce the difference pressuring loss in the preheater Flow of Goods and Materials.
5, fervent sheet delivery system
In order to reduce factory building height, the section after the preheating to be delivered in the polycondensation tower by hot handling machinery, hot conveying utilizes hot nitrogen to be source of the gas, and its feeding process is subjected to the control of charge level controller in the polycondensation tower.
6, system of solid-state polycondensation
Section after the preheating enters in the solid phase polycondensation tower, and the nitrogen that process purifies is taken the byproduct in the polyester slice out of in the polycondensation tower with gas velocity, temperature and the fluid state of the best, and according to processing requirement, increases the limiting viscosity of section.Solid phase polycondensation is that an anaerobic does not have wet pyroreaction, guarantee that the sufficiently long section residence time just can reach ideal reactivity (as the minimizing of increase of IV value and AA).Main technologic parameters comprises: nitrogen temperature is at 165-225 ℃; Nitrogen flow 150-250m3/hr; The purity of nitrogen reaches 99.999%; PET was at about 8-16 of the residence time of reactive system hour; Temperature of reaction generally is controlled at 198--220 ℃.
SSP process in the SSP solid state polycondensation is the process of a polyreaction, the molecular weight of PET (viscosity raisings) generally between 0.78---0.87 (according to kind requirement) of rising in reaction, an important indicator of production be and central value between deviation.The small molecules H that produces in the reaction process
2O (water) and EG (ethylene glycol) are constantly taken out of reactor by nitrogen, (remove H by purifying treatment
2O and EG) after nitrogen circulation use.
After the viscosity central value of PET is determined, the control of deviation is the key link of whole process of production quality control, and the present invention increases online viscosity controller operation, by the online sampling analysis viscosity of Controlling System, the feedback regulation processing parameter makes the deviation of viscosity reach minimum.
7, nitrogen purge system
This system cleans, filters the nitrogen of solid state polycondensation and be dry.Acetaldehyde in the circulating nitrogen gas, ethanol and moisture are removed, acetaldehyde and ethanol are by oxidation reactor the time and the oxygen in the pressurized air that adds in system reaction, generate carbonic acid gas and water, thereby be removed, polyreaction and catalysis, the water that oxidizing reaction generated, remove through the molecular sieve drying machine,, be recycled through after the secondary filter.
8, cooling system
This system is used to cool off the polyester slice that comes out from the solid state polycondensation device, process of cooling occurs in the fluidized bed cooler under the air effect, the cooling of section has stopped polymerization process effectively, makes material characteristic be stabilized in a certain state, also removes dust and impurity simultaneously.Section enters two packing feed bins respectively, and material level is subjected to the charge level controller controlling alarm, packs then.
9, process control system
Controlling System is realized that by a DCS system device control mainly realizes that by monitor and the keyboard of operating each workstation workstation is installed in the watch-keeping cubicle.But part needs the mechanical control unit erecting stage operator's console of execute-in-place.Increase online viscosity controller operation in the Controlling System, by the online sampling analysis viscosity of Controlling System, the feedback regulation processing parameter makes the deviation of viscosity reach minimum.
After solid phase polycondensation technics of enhancing viscosity process, after testing, the polyester bottles grade pet chip reaches following quality standard:
Viscosity: limiting viscosity IV=(0.78-0.85) ± 0.02 (the IPA addition is less than 2% for GB/T 17931-1999, A method limiting viscosity);
Maximum tackify degree: 0.23 dl/g;
Colour: b value increased value≤3, L value 86 ± 2;
Acetaldehyde (AA) ppm≤1.0;
Dust content ppm≤50;
Poisonous residuals content ppb≤213 (meeting the U.S. FDA standard);
All the other indexs of correlation all meet the GB/T17931-1999 standard.
Claims (10)
1, a kind of production technique of utilizing the polyester returnable bottle to make the food grade polyester bottle slice comprises the steps:
1) cleans, pulverizes in blocks, impurity separation to reclaiming polyester bottles;
2) trace impurity that reclaims in the polyester bottle slice is removed;
3) solid phase polycondensation tackify process.
2, production technique as claimed in claim 1 is characterized in that: described step 2) comprise the steps:
21) the polyester bottles fragment is reclaimed in fusing, and polythene PE, polyvinylchloride, the polypropylene PP pyrolysis gasification of trace are discharged;
22) use additive to carry out modification;
23) use filter plant that melt is filtered, the carbide of mechanical impurity, ring-type colloid and degraded is removed;
24) granulation output.
3, production technique as claimed in claim 1 or 2 is characterized in that: described step 1) comprises the steps:
11) washing, 12) the polyvinylchloride label divests 13) label separates 14) pulverize in flakes 15) develop a film 16) hydrophily Jie's gravity separation impurity, 17) dehydrate 18) cyclonic separation impurity.
4, production technique as claimed in claim 1 or 2 is characterized in that: described step 3) comprises the steps:
31) pre-crystallization, 32) crystallization, 33) preheating, 34) earnestly sheet conveying, 35) solid phase polycondensation, 36) polyester slice cooling output; Wherein said step 35) detailed process comprises: determine PET viscosity central value, by the online sampling analysis viscosity of Controlling System, the feedback regulation processing parameter makes the deviation of viscosity reach minimum.
5, production technique as claimed in claim 2, it is characterized in that: adopt multiple screw extruder described step 21), carry out segmentation temperature, pressure, residence time control, the temperature of first section control is at 150--200 ℃, pressure is about absolute pressure 300mbar, the residence time is 9-25 minute, and the polyvinylchloride pyrolysis gasification of trace is discharged; Second section temperature is at 250--280 ℃, and pressure-controlling is about absolute pressure 150mbar, and the residence time is 6-16 minute, and the polyvinylchloride of trace, polypropylene PP pyrolysis gasification are discharged; In described step 22) in, temperature is controlled at 280--310 ℃, pressure-controlling gauge pressure 100Kg/cm
2Below, the residence time is between 5-12 minute.
6, as claim 2 or 5 described production technique, it is characterized in that: the additive that adopts described step 22) comprises stablizer, and its effect is to prevent degraded and viscosity homogenizing; Can also add toning, heat absorption, uvioresistant, improve one or more of additives such as crystallization.
7, production technique as claimed in claim 3, it is characterized in that: in the described step 1), in step 18) before or after, the involving vibrations separating step gone back: PET bottle sheet is being separated residual non-PET impurity in the process that next unit is carried by the vibration separating unit.
8, production technique as claimed in claim 3 is characterized in that: in the described step 1), in step 18) before or after, also comprise optics PVC separating step: adopt optics PVC separating device that residual PVC is separated.
9, as claim 3 or 7 or 8 described production technique, it is characterized in that: in the described step 1), between step 13) and step 14), also comprise step 14 ') bottle screening: screen out the residual a spot of foreign matter down in each unit of front end, comprise heterogeneous bottle class, heterochromatic bottle class, small numbers of tags bits, metal reactant, rubbish etc.
10, as claim 3 or 7 or 8 described production technique, it is characterized in that: described step 16) concrete grammar of hydrophily Jie's gravity separation is: pulverize back blended fragment, utilize the difference of PET and PP, high-pressure polyethylene LDPE proportion, with water is media, PET fragment precipitation, PP, LDPE fragment come-up make the PET fragment reach purification effects again.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101905494B (en) * | 2010-07-02 | 2012-10-17 | 北京德通化纤工业有限公司 | Process for producing regenerated polyester chip by using regenerated bottle chip and device thereof |
| CN101905494A (en) * | 2010-07-02 | 2010-12-08 | 北京德通化纤工业有限公司 | Process for producing regenerated polyester chip by using regenerated bottle chip and device thereof |
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| CN102505182B (en) * | 2011-09-28 | 2013-12-11 | 南京工业职业技术学院 | Method for preparing functional ultraviolet-resistant polyester staple fiber from waste renewable polyester bottle chips |
| CN102773944A (en) * | 2012-07-27 | 2012-11-14 | 安徽环嘉天一再生资源有限公司 | Environment-friendly abandoned plastic bottle recovering and processing technology |
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| CN109605607A (en) * | 2018-12-30 | 2019-04-12 | 福建省金怡丰工贸有限公司 | A kind of waste plastic high efficiente callback and circulation utilization method |
| CN112695392A (en) * | 2020-11-25 | 2021-04-23 | 亚东工业（苏州）有限公司 | Method for manufacturing high-modulus low-shrinkage industrial yarn by utilizing recycled polyester |
| CN114603748A (en) * | 2022-01-24 | 2022-06-10 | 光大环境科技（中国）有限公司 | Food-grade plastic raw material recovery method and recovery system |
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