CN102585361A - Method for regenerating polypropylene reclaimed material - Google Patents
Method for regenerating polypropylene reclaimed material Download PDFInfo
- Publication number
- CN102585361A CN102585361A CN2012100041445A CN201210004144A CN102585361A CN 102585361 A CN102585361 A CN 102585361A CN 2012100041445 A CN2012100041445 A CN 2012100041445A CN 201210004144 A CN201210004144 A CN 201210004144A CN 102585361 A CN102585361 A CN 102585361A
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- CN
- China
- Prior art keywords
- vestolen
- reclaimed materials
- materials
- polypropylene
- reclaimed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/04—Particle-shaped
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/92209—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
- B29C2948/9259—Angular velocity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92885—Screw or gear
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92895—Barrel or housing
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention discloses a method for regenerating a polypropylene reclaimed material. The method comprises the following steps of: firstly, measuring a melting peak temperature Tpm of the polypropylene reclaimed material by adopting a differential scanning calorimetry, then evaluating the aging degree of the polypropylene reclaimed material according to a measurement result of the melting peak temperature Tpm and determining the additive amount of the polypropylene reclaimed material in a polypropylene reworked material according to an evaluation result; according to the determined additive amount, compounding and blending a fresh granular polypropylene material and the polypropylene reclaimed material to prepare the polypropylene reworked material; and pelleting the polypropylene reworked material. According to the method disclosed by the invention, the aging degree of the polypropylene reclaimed material can be accurately evaluated quantitatively; the prepared reworked material has the mechanical performance very close to that of a common commercially-available fresh granular polypropylene material and has the characteristics of low price, excellent performance and the like; and the polypropylene reclaimed material is recycled furthest.
Description
Technical field
The invention belongs to the plastics recovery field, be specifically related to a kind of Vestolen PP 7052 reclaimed materials renovation process.
Background technology
" energy-saving and emission-reduction ", " environment protection " have become the important goal of countries in the world economy and technical development.The recovery of plastics and recycling; Help solving the dysgenic problem that plastic wrapping etc. caused " white pollution " brings for national economy and ecotope; Save cost, the aim of saving except reaching,, can also significantly reduce the use of methods such as burning disposal waste or used plastics through reclaiming and recycling; Thereby reach the purpose that reduces carbon emission, contribute for preventing Global warming.Thereby, have prior meaning.
In recent years, the correlation technique about plastics recovery and recycling occurs a lot.But most masters that are improved to plastic recoverying equipment.Some document is mentioned plastics recovery material and common commercially available fresh resin material is carried out compound blend, makes reworked material.Yet; Because its degree of aging of the resin material that reclaims is different; Make the performance of reworked material fluctuation largely occur, how to maximally utilise common commercially available fresh resin material and carry out compound blend, it is reasonably combined to make that the blend ratio obtains; Can make reworked material obtain the mechanics mechanical property suitable with common corresponding resin; Can make reclaimed materials reach maximum usage quantity again, thereby make reworked material have the characteristics of good combination property such as cheap, functional concurrently, then be a problem that very important needs solve.
Summary of the invention
Goal of the invention of the present invention is to overcome the deficiency of prior art, proposes a kind of Vestolen PP 7052 reclaimed materials renovation process.This method can be rationally carried out quantitative evaluation to the degree of aging of Vestolen PP 7052 reclaimed materials exactly; And according to the blending ratio of reclaimed materials in the assessment result control reworked material with fresh material, preparation mechanics mechanical property and the common commercially available fresh close reworked material of polypropylene granules ten minutes.Thereby realize the highly efficient regeneration of reclaimed materials.
Above-mentioned purpose of the present invention is achieved through following technical scheme:
A kind of Vestolen PP 7052 reclaimed materials renovation process comprises the steps:
(1) adopts the melting peak temperature T of dsc (DSC) to the Vestolen PP 7052 reclaimed materials
PmMeasure,
(2) according to melting peak temperature T
PmMeasuring result the degree of aging of Vestolen PP 7052 reclaimed materials is estimated, and, confirm the addition of Vestolen PP 7052 reclaimed materials in the polypropene recycled materials according to evaluation result;
(3) set by step (2) definite addition with fresh polypropylene granules and the compound blend processing of Vestolen PP 7052 reclaimed materials, makes polypropene recycled materials; Polypropene recycled materials is carried out granulation.
As a kind of preferred version, in the step (1), the test atmosphere of said dsc is preferably: N
2Atmosphere; Air-flow velocity is 20～50mL/min; Temperature rise rate and rate of temperature fall are 2～20 ℃/min, and intensification and cooling scope are 20 ℃～250 ℃.
In the step (1), said dsc can adopt method by single-stage or three-stage process to carry out melting peak temperature T
PmMeasurement.
Method by single-stage promptly adopts direct intensification melting method to carry out, melting peak temperature T
PmBe determined in the intensification fused process and carry out.
Three-stage process comprises the fusion that heats up for the first time, decrease temperature crystalline, three steps of fusion that heat up for the second time, melting peak temperature T successively
PmBe determined in the fused process that heats up for the second time and carry out.
Usually, the melting peak temperature T of Vestolen PP 7052 reclaimed materials
PmBetween 140～180 ℃, through detecting and combine experiment, we find, and are in the step (2), following to the evaluation method of the degree of aging of Vestolen PP 7052 reclaimed materials:
180 ℃>=T
Pm＞155 ℃, be low degree of aging section, promptly when the melting peak temperature be between 155～180 ℃ the time, can think that the degradation with aging degree of Vestolen PP 7052 reclaimed materials is lower;
155 ℃＞T
Pm>=150 ℃, be medium degree of aging section, promptly when the melting peak temperature be between 150～155 ℃ the time, can think the Vestolen PP 7052 reclaimed materials appearance tangible degradation with aging;
150 ℃＞T
Pm>=140 ℃, be high degree of aging section, promptly when the melting peak temperature be below 150 ℃ the time, can think that the degradation with aging degree of Vestolen PP 7052 reclaimed materials is higher.
Through experiment, we also find, for the Vestolen PP 7052 reclaimed materials that is in different degree of agings, must control its deal in reworked material, and are little with the mechanical property mechanics mechanical property and the common commercially available fresh polypropylene granules difference that guarantee reworked material.
Specifically, for:
Low degree of aging section, the mass percent of Vestolen PP 7052 reclaimed materials is 85～95% in the polypropene recycled materials;
Medium degree of aging section, the mass percent of Vestolen PP 7052 reclaimed materials is 45～85% in the polypropene recycled materials;
High degree of aging section, the mass percent of Vestolen PP 7052 reclaimed materials is 5～45% in the polypropene recycled materials.
In the step (3), said compound blend method for processing is extruded for opening refining, banburying or screw rod.
Preferably, the processing temperature of opening refining or banburying is 170～250 ℃, and rotating speed is 10～80rpm; The processing temperature that screw rod is extruded is 170～250 ℃, and rotating speed is 10～250rpm.
Preferably, in the step (3), said process for granulating is preferably crusher in crushing or extrudes pelletizing.
More preferably, for the banburying material, adopt broken granulation; For extruded stock, adopt the method granulation of pelletizing.Made pellet can be used as the raw material of making various plastics, can adopt extrude, working method moulding such as injection.
By said Vestolen PP 7052 reclaimed materials renovation process, can allocate the ratio of reclaimed materials and fresh material in the polypropene recycled materials exactly, the mechanics mechanical property of gained polypropene recycled materials and fresh material are as good as.
Compared with prior art, the present invention has following beneficial effect:
Renovation process of the present invention can be exactly carries out quantitative evaluation to the degree of aging of Vestolen PP 7052 reclaimed materials; And according to the blending ratio of reclaimed materials and fresh material in the assessment result control reworked material; Prepare mechanics mechanical property and the very close reworked material of common commercially available fresh polypropylene granules, kept the performance of reworked material when therefore can make reclaimed materials reach maximum usage quantity; Make reworked material have characteristics such as cheap, functional concurrently, realize the maximum recycling of Vestolen PP 7052 reclaimed materials.
Embodiment
Below in conjunction with specific embodiment the present invention is described further, specific embodiment is not done any qualification to the present invention.
Embodiment 1
To carry out the DSC test through the Vestolen PP 7052 reclaimed materials that letter sorting obtains, measuring its melting peak temperature is 158.5 ℃.The degradation with aging degree of judging this Vestolen PP 7052 reclaimed materials is not high, and it is composite regenerated to adopt higher ratio to carry out.Carry out compound blend by above-mentioned Vestolen PP 7052 reclaimed materials and common commercially available fresh polypropylene granules (CJS700, Guangzhou Branch Co., Chinse Petro-Chemical Corp) by 95: 5 mass ratioes.Compound blend is carried out on Banbury mixer, and the banburying temperature is 180 ℃, and the banburying time is 10min, and the banburying rotating speed is 30rpm.Blend composition after the banburying adopts crusher to carry out fragmentation, makes the highly efficient regeneration polypropylene granules that the particle diameter is about 5cm.Prepared highly efficient regeneration polypropylene granules is processed mechanics measuring mechanical property batten (GB/T1040-2006), carry out the tensile property test, the rate of extension of test is 50mm/min.Recording the polyacrylic tensile strength of highly efficient regeneration is 36.2MPa, with the tensile property of common commercially available fresh polypropylene granules CJS700 quite (36.3MPa).
Embodiment 2
To carry out the DSC test through the Vestolen PP 7052 reclaimed materials that letter sorting obtains, measuring its melting peak temperature is 155.0 ℃.The degradation with aging degree of judging this Vestolen PP 7052 reclaimed materials is also not very high, but certain degradation with aging occurred, so it is composite regenerated to adopt quite high ratio to carry out.Carry out compound blend by above-mentioned Vestolen PP 7052 reclaimed materials and common commercially available fresh polypropylene granules (CJS700, Guangzhou Branch Co., Chinse Petro-Chemical Corp) by 85: 15 mass ratioes.Compound blend is carried out on twin screw extruder, and three sections extrusion temperatures are respectively 180 ℃, and 190 ℃, 200 ℃, screw speed is 180rpm.Blend composition after extruding directly adopts the dicing machine pelletizing, makes the highly efficient regeneration polypropylene granules.Prepared highly efficient regeneration polypropylene granules is processed mechanics measuring mechanical property batten (GB/T 1040-2006), carry out the tensile property test, the rate of extension of test is 50mm/min.Recording the polyacrylic tensile strength of highly efficient regeneration is 36.1MPa, with the tensile property of common commercially available fresh polypropylene granules CJS700 quite (36.3MPa).
Embodiment 3
To carry out the DSC test through the Vestolen PP 7052 reclaimed materials that letter sorting obtains, measuring its melting peak temperature is 152.0 ℃.Judge that significantly degradation with aging has appearred in this Vestolen PP 7052 reclaimed materials, thus need suitably to increase the ratio of common commercially available fresh polypropylene granules carry out composite regenerated, with counteracting Vestolen PP 7052 reclaimed materials to the reworked material Effect on Performance.Carry out compound blend by above-mentioned Vestolen PP 7052 reclaimed materials and common commercially available fresh polypropylene granules (CJS700, Guangzhou Branch Co., Chinse Petro-Chemical Corp) by 70: 30 mass ratioes.Compound blend is carried out on Banbury mixer, and the banburying temperature is 180 ℃, and the banburying time is 10min, and the banburying rotating speed is 30rpm.Blend composition after the banburying adopts crusher to carry out fragmentation, makes the highly efficient regeneration polypropylene granules that the particle diameter is about 5cm.Prepared highly efficient regeneration polypropylene granules is processed mechanics measuring mechanical property batten (GB/T1040-2006), carry out the tensile property test, the rate of extension of test is 50mm/min.Recording the polyacrylic tensile strength of highly efficient regeneration is 36.1MPa, with the tensile property of common commercially available fresh polypropylene granules CJS700 quite (36.3MPa).
Embodiment 4
To carry out the DSC test through the Vestolen PP 7052 reclaimed materials that letter sorting obtains, measuring its melting peak temperature is 147.5 ℃.The degradation with aging degree of judging this Vestolen PP 7052 reclaimed materials is higher, so the ratio of Vestolen PP 7052 reclaimed materials should not be too high, to weaken the negative impact of Vestolen PP 7052 reclaimed materials to the reworked material performance.Carry out compound blend by above-mentioned Vestolen PP 7052 reclaimed materials and common commercially available fresh polypropylene granules (CJS700, Guangzhou Branch Co., Chinse Petro-Chemical Corp) by 30: 70 mass ratioes.Compound blend is carried out on twin screw extruder, and three sections extrusion temperatures are respectively 180 ℃, and 190 ℃, 200 ℃, screw speed is 180rpm.Blend composition after extruding directly adopts the dicing machine pelletizing, makes the highly efficient regeneration polypropylene granules.Prepared highly efficient regeneration polypropylene granules is processed mechanics measuring mechanical property batten (GB/T 1040-2006), carry out the tensile property test, the rate of extension of test is 50mm/min.Recording the polyacrylic tensile strength of highly efficient regeneration is 35.0MPa, with the tensile property of common commercially available fresh polypropylene granules CJS700 basically near (36.3MPa).
Embodiment 5
To carry out the DSC test through the Vestolen PP 7052 reclaimed materials that letter sorting obtains, measuring its melting peak temperature is 150.0 ℃.The degradation with aging degree of judging this Vestolen PP 7052 reclaimed materials is higher, so the ratio of Vestolen PP 7052 reclaimed materials should not be too high, to weaken the negative impact of Vestolen PP 7052 reclaimed materials to the reworked material performance.Carry out compound blend by above-mentioned Vestolen PP 7052 reclaimed materials and common commercially available fresh polypropylene granules (CJS700, Guangzhou Branch Co., Chinse Petro-Chemical Corp) by 45: 55 mass ratioes.Compound blend is carried out on twin screw extruder, and three sections extrusion temperatures are respectively 180 ℃, and 190 ℃, 200 ℃, screw speed is 180rpm.Blend composition after extruding directly adopts the dicing machine pelletizing, makes the highly efficient regeneration polypropylene granules.Prepared highly efficient regeneration polypropylene granules is processed mechanics measuring mechanical property batten (GB/T 1040-2006), carry out the tensile property test, the rate of extension of test is 50mm/min.Recording the polyacrylic tensile strength of highly efficient regeneration is 35.9MPa, with the tensile property of common commercially available fresh polypropylene granules CJS700 basically near (36.3MPa).
Claims (10)
1. a Vestolen PP 7052 reclaimed materials renovation process is characterized in that, comprises the steps:
(1) adopts the melting peak temperature T of dsc to the Vestolen PP 7052 reclaimed materials
PmMeasure,
(2) according to melting peak temperature T
PmMeasuring result the degree of aging of Vestolen PP 7052 reclaimed materials is estimated, and, confirm the addition of Vestolen PP 7052 reclaimed materials in the polypropene recycled materials according to evaluation result;
(3) set by step (2) definite addition with fresh polypropylene granules and the compound blend processing of Vestolen PP 7052 reclaimed materials, makes polypropene recycled materials; Polypropene recycled materials is carried out granulation.
2. Vestolen PP 7052 reclaimed materials renovation process according to claim 1 is characterized in that in the step (1), the test atmosphere of said dsc is: N
2Atmosphere; Air-flow velocity is 20～50mL/min; Temperature rise rate and rate of temperature fall are 2～20 ℃/min, and intensification and cooling scope are 20 ℃～250 ℃.
3. Vestolen PP 7052 reclaimed materials renovation process according to claim 1 is characterized in that in the step (1), said dsc adopts direct intensification melting method to carry out, melting peak temperature T
PmBe determined in the intensification fused process and carry out.
4. Vestolen PP 7052 reclaimed materials renovation process according to claim 1 is characterized in that, in the step (1), said dsc adopts the fusion that heats up for the first time, decrease temperature crystalline, the fused syllogic method that heats up for the second time to carry out melting peak temperature T
PmBe determined in the fused process that heats up for the second time and carry out.
5. Vestolen PP 7052 reclaimed materials renovation process according to claim 1 is characterized in that, and is in the step (2), following to the evaluation method of the degree of aging of Vestolen PP 7052 reclaimed materials:
180 ℃>=T
Pm＞155 ℃, be low degree of aging section;
155 ℃＞T
Pm>=150 ℃, be medium degree of aging section;
150 ℃＞T
Pm>=140 ℃, be high degree of aging section.
6. like the said Vestolen PP 7052 reclaimed materials of claim 5 renovation process, it is characterized in that, low degree of aging section, the mass percent of Vestolen PP 7052 reclaimed materials is 85～95% in the polypropene recycled materials;
Medium degree of aging section, the mass percent of Vestolen PP 7052 reclaimed materials is 45～85% in the polypropene recycled materials;
High degree of aging section, the mass percent of Vestolen PP 7052 reclaimed materials is 5～45% in the polypropene recycled materials.
7. Vestolen PP 7052 reclaimed materials renovation process according to claim 1 is characterized in that in the step (3), said compound blend method for processing is extruded for opening refining, banburying or screw rod.
8. like the said Vestolen PP 7052 reclaimed materials of claim 7 renovation process, it is characterized in that the processing temperature of opening refining or banburying is 170～250 ℃, rotating speed is 10～80rpm; The processing temperature that screw rod is extruded is 170～250 ℃, and rotating speed is 10～250rpm.
9. Vestolen PP 7052 reclaimed materials renovation process according to claim 1 is characterized in that in the step (3), said process for granulating is crusher in crushing or extrudes pelletizing.
10. the polypropene recycled materials for preparing by the said Vestolen PP 7052 reclaimed materials of claim 1 renovation process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100041445A CN102585361A (en) | 2012-01-06 | 2012-01-06 | Method for regenerating polypropylene reclaimed material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100041445A CN102585361A (en) | 2012-01-06 | 2012-01-06 | Method for regenerating polypropylene reclaimed material |
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| CN102585361A true CN102585361A (en) | 2012-07-18 |
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| CN2012100041445A Pending CN102585361A (en) | 2012-01-06 | 2012-01-06 | Method for regenerating polypropylene reclaimed material |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103399032A (en) * | 2013-08-05 | 2013-11-20 | 上海出入境检验检疫局工业品与原材料检测技术中心 | Method for detecting photodegradation performances of short-period non-woven material |
| CN104723474A (en) * | 2015-04-02 | 2015-06-24 | 泉州豪威废旧物资回收有限公司 | Regenerative granulation process device of EVA waste |
| CN110564000A (en) * | 2018-08-08 | 2019-12-13 | 涡阳县恒丰塑胶制品有限公司 | regeneration method of polypropylene reclaimed material |
| CN109870561B (en) * | 2017-12-04 | 2024-05-14 | 金发科技股份有限公司 | Method for detecting high-density or low-density polyethylene reclaimed material |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103399032A (en) * | 2013-08-05 | 2013-11-20 | 上海出入境检验检疫局工业品与原材料检测技术中心 | Method for detecting photodegradation performances of short-period non-woven material |
| CN104723474A (en) * | 2015-04-02 | 2015-06-24 | 泉州豪威废旧物资回收有限公司 | Regenerative granulation process device of EVA waste |
| CN109870561B (en) * | 2017-12-04 | 2024-05-14 | 金发科技股份有限公司 | Method for detecting high-density or low-density polyethylene reclaimed material |
| CN110564000A (en) * | 2018-08-08 | 2019-12-13 | 涡阳县恒丰塑胶制品有限公司 | regeneration method of polypropylene reclaimed material |
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Application publication date: 20120718 |