WO2001034688A1 - Verfahren und vorrichtung zur dekontamination von polykondensaten - Google Patents
Verfahren und vorrichtung zur dekontamination von polykondensaten Download PDFInfo
- Publication number
- WO2001034688A1 WO2001034688A1 PCT/CH2000/000427 CH0000427W WO0134688A1 WO 2001034688 A1 WO2001034688 A1 WO 2001034688A1 CH 0000427 W CH0000427 W CH 0000427W WO 0134688 A1 WO0134688 A1 WO 0134688A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- flakes
- decontamination
- post
- condensation
- condensed
- Prior art date
Links
- 0 C(C1)C1(CC1)*C1C1=CC1 Chemical compound C(C1)C1(CC1)*C1C1=CC1 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/88—Post-polymerisation treatment
- C08G63/90—Purification; Drying
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
- B29B2017/0203—Separating plastics from plastics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
- B29B2017/0213—Specific separating techniques
- B29B2017/0279—Optical identification, e.g. cameras or spectroscopy
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/06—PVC, i.e. polyvinylchloride
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
- B29K2067/003—PET, i.e. poylethylene terephthalate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
- B29K2067/006—PBT, i.e. polybutylene terephthalate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/065—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts containing impurities
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7158—Bottles
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/78—Preparation processes
- C08G63/80—Solid-state polycondensation
-
- 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
- Y02W30/62—Plastics recycling; Rubber recycling
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/131—Glass, ceramic, or sintered, fused, fired, or calcined metal oxide or metal carbide containing [e.g., porcelain, brick, cement, etc.]
- Y10T428/1317—Multilayer [continuous layer]
- Y10T428/1321—Polymer or resin containing [i.e., natural or synthetic]
Definitions
- the invention relates to a method for decontamination of polycondensates, such as PET, PBT, PEN or PA, according to the preamble of claim 1, and an apparatus for carrying out such a method.
- the method and device are used in particular in the processing of used PET or the like, for example of beverage bottles.
- PET bottles have been in use for a few years and have also been collected, re-used, shredded into flakes and superficially cleaned for years.
- PET bottles already have a high recycling rate __u.
- the sorting can be done both manually and mechanically using various optical methods or it can also be integrated into the surface cleaning.
- the surface cleaning usually includes various washing and separation stages and a crushing of the PET beverage bottles into flakes.
- Superficially cleaned PET flakes from PET bottles can also be produced using a dry mechanical method.
- PET is comminuted, mixed, heated and pre-compacted in a vacuum. This is followed by extrusion and degassing, the energy consumption being lower due to the preceding heating.
- the extruded material becomes fibers, foils and the like. a. moved out.
- Another process involves crushing PET objects into flakes, drying them and then extruding them in a twin-screw extruder and then granulating them.
- the granulate is crystallized and later subjected to an SSP treatment discontinuously.
- US Pat. No. 5,899,392 discloses a method for decontaminating finely ground RPET, preferably with heating in hot gas, for example nitrogen.
- RPET flakes are ground to particles significantly smaller than 0.25 cm. Decontamination should also be possible by placing the finely ground particles in a liquid solution.
- PET flakes are first wetted with NaOH and then treated in a rotary kiln at high temperature for a few hours. Layers close to the surface of the flakes are etched off. This represents a certain departure from the aforementioned procedures, but here is In addition to the loss of material due to the etching, there is also a disposal problem for the residual materials.
- the invention is therefore based on the object of developing a process for the decontamination of RPET which avoids the disadvantages of the prior art and can be carried out continuously. This object is achieved with the characterizing features of claim 1. Another object of the invention is to provide a suitable device for the decontamination of RPET in carrying out the method according to claim 1. This is done with the means of the characterizing features of claim 11. Advantageous refinements are disclosed in the respective subclaims.
- the invention is based on the knowledge that the contaminants are not uniformly distributed over the RPET and are also present primarily on the surface or near-surface areas. This then makes better use of the cleaning potential of treatment processes in the hot gas stream. Normally, crystallization and / or SSP treatment is sufficient to clean RPET in a food-safe manner and to use it again as packaging for food, for example for beverage bottles.
- the decontamination is preferably carried out continuously in the hot gas stream of a crystallization and / or SSP process, which enables the extensive use of conventional, basic devices and process sequences for crystallization and post-condensation (including increasing the IV value) of PET and the like in the solid phase , Devices of this type are described, for example, in EP-A-379684, whereby according to the invention there can be a shortening to a 3-stage process. If air can be used at temperatures up to approx. 180 ° C, nitrogen is used as the hot gas at temperatures above or above 180 ° C. The decontamination of PET can thus be integrated into an SSP system or an SSP process as a whole. Sub-processes can be carried out without intermediate cooling if possible and thus save energy.
- polymer flakes are subjected to a color sorting with simple optical means after heating, then an exact material separation can be carried out in a simple manner, which enables further processing according to type or type.
- a color sorting with simple optical means after heating
- an exact material separation can be carried out in a simple manner, which enables further processing according to type or type.
- PET hardly changes color when heated to a crystallization temperature
- PVC turns black and others turn brown.
- Such color sorting can take place before or after crystallization or post-condensation; if necessary, heating can take place in a separate device, for example in a fluidized or fluidized bed.
- Crystallization and / or post-condensation depending on temperature and residence time, result in a cleaning efficiency of at least 99%.
- Such high values can be achieved even with relatively short dwell times of approx. 2 h and a temperature of approx. 190 ° C or 20 minutes at a temperature of 210 ° C, which indicates contamination close to the surface.
- a previous extrusion of PET resulted in a reduction in the concentration of the contaminants (as also in the case of crystallization), but these are at the same time distributed more homogeneously and also in deeper layers, so that the diffusion paths increase and the decontamination efficiency in a crystallization and / or aftercondensation at least partially decreases.
- the invention is described in more detail in an exemplary embodiment with reference to a drawing.
- the drawing shows an embodiment of a decontamination of PET with crystallization and SSP.
- Commercial post-consumer PET bottles RPET
- the bottles can often be shredded into flakes at retail outlets or in collection centers.
- the flakes are first washed in the usual manner and dried on the surface.
- the flakes then go directly into a crystallizer 1, here a fluidized bed, type OTWG from the applicant.
- a crystallizer 1 here a fluidized bed, type OTWG from the applicant.
- a gas temperature (air) 180 ° C
- the material is crystallized during a dwell time of approx. 20 minutes.
- the flakes then go directly into a shaft reactor 2, where they are continuously post-condensed in countercurrent to an N 2 gas stream (temperature approx. 220 ° C.). An IV : value of approx. 0.78 to 0.84 is achieved.
- the decontaminated RPET then passes into a cooler 3.
- the cleaning efficiency is at least 99.6% to> 99.9% based on toluene. Chlorobenzene or benzophenone, among others, can also be removed just as efficiently.
- a preheater can be provided in front of the shaft reactor '2, or the crystallization can take place at a higher temperature under inert gas (preferably N 2 ), and previous crystallization can also be dispensed with.
- An extruder 4 could also be arranged instead of the cooler.
- surface-cleaned flakes are crystallized in crystallizer 1 for about 20 minutes at a temperature of about 210 ° C. in an inert gas stream.
- the crystallized flakes then go directly into the cooler 3 or are cooled in a separate area in the crystallizer 1.
- an extruder 4 can be arranged.
- a cleaning efficiency greater than 99% can also be determined.
- the post-condensation without a previous extrusion shows a very good cleaning efficiency, so that prior re-granulation of the PET material can therefore be dispensed with or should be dispensed with from the point of view of decontamination.
- an extrusion following the post-condensation can be useful, for example to remove non-melting substances using a melt filter.
- the release of acetaldehyde must be taken, which can, however, be bound by adding suitable additives.
- suitable addition of reactive components to increase the IV value (as well as other additives) post-condensation may be dispensed with.
Landscapes
- Chemical & Material Sciences (AREA)
- Polymers & Plastics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Sustainable Development (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/129,591 US6730774B1 (en) | 1999-11-08 | 2000-08-09 | Method and device for decontaminating polycondensates |
EP00947735A EP1234001A1 (de) | 1999-11-08 | 2000-08-09 | Verfahren und vorrichtung zur dekontamination von polykondensaten |
AU61451/00A AU6145100A (en) | 1999-11-08 | 2000-08-09 | Method and device for decontaminating polycondensates |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19953659.7 | 1999-11-08 | ||
DE1999153659 DE19953659A1 (de) | 1999-11-08 | 1999-11-08 | Verfahren und Vorrichtung zur Dekontamination von Polykondensaten |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001034688A1 true WO2001034688A1 (de) | 2001-05-17 |
Family
ID=7928276
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CH2000/000427 WO2001034688A1 (de) | 1999-11-08 | 2000-08-09 | Verfahren und vorrichtung zur dekontamination von polykondensaten |
Country Status (5)
Country | Link |
---|---|
US (1) | US6730774B1 (de) |
EP (1) | EP1234001A1 (de) |
AU (1) | AU6145100A (de) |
DE (1) | DE19953659A1 (de) |
WO (1) | WO2001034688A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004095390A3 (en) * | 2003-04-02 | 2006-08-17 | Phoenix Technologies Int | Method for preparing extremely small particles of recycled polyethylene terepathalate |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10102062A1 (de) * | 2001-01-17 | 2002-07-18 | Frisse Richard Maschf | Verfahren zum Aufbereiten von verunreinigtem Polykondensat-Material |
CA2520872A1 (en) * | 2003-04-02 | 2004-11-04 | Phoenix Technologies International, Llc | Improved method for treating recycled polyethylene terephthalate |
NL1025609C2 (nl) * | 2004-03-01 | 2005-09-05 | Buehler Gmbh | Inrichting voor het weken van gerst. |
DE102004059808A1 (de) * | 2004-12-10 | 2006-06-14 | Krones Ag | Dekontamination von Flakes |
DE102005013701A1 (de) * | 2005-03-24 | 2006-09-28 | Krones Ag | Verfahren und Vorrichtung zur Dekontamination von Kunststoffflakes |
DE102007050315A1 (de) * | 2007-10-18 | 2009-04-23 | Krones Ag | Vorrichtung zum Austragen von Schüttgut |
DE102010002054A1 (de) * | 2010-02-17 | 2011-08-18 | Krones Ag, 93073 | Verfahren und Anlage zum Herstellen von Behälter-Preforms |
US20110245457A1 (en) * | 2010-04-01 | 2011-10-06 | Rougelot Rodney S | System and method for recycling resin particles |
DE102010063601A1 (de) | 2010-12-20 | 2012-06-21 | Krones Aktiengesellschaft | Verfahren und Vorrichtung zum Abtrennen von Fremdpolymeren aus einem Polymergemisch |
GB2492942A (en) * | 2011-04-20 | 2013-01-23 | Buhler Sortex Ltd | Processing system and method |
DE102015118393A1 (de) * | 2015-10-28 | 2017-05-04 | STF Maschinen- & Anlagenbau GmbH | Verfahren zum Sortieren von Verpackungsbehälter aus Kunststoff |
MX2023002369A (es) * | 2020-09-03 | 2023-07-11 | Php Fibers Gmbh | Metodo para reciclar poliester. |
CH717934A1 (de) * | 2020-10-06 | 2022-04-14 | Alpla Werke Alwin Lehner Gmbh & Co Kg | Verfahren zum Recyclen von Schalen und Blistern aus PET. |
CH719619A1 (de) * | 2022-04-22 | 2023-10-31 | Alpla Werke Alwin Lehner Gmbh & Co Kg | Verfahren zum Recycling von Polyester-Behältern. |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3804811A (en) * | 1972-04-12 | 1974-04-16 | Horizons Inc | Shaped articles from reconstituted polyester |
EP0376119A2 (de) * | 1988-12-27 | 1990-07-04 | COBARR S.p.A. | Verfahren zur Wiederverwendung von PET-Getränkeflaschen |
DE4015951A1 (de) * | 1990-05-18 | 1991-11-21 | Fernholz Gmbh & Co Kg W & H | Verfahren zum sortieren von bechern aus kunststoff |
US5090134A (en) * | 1988-12-23 | 1992-02-25 | Buhler Ag | Method and apparatus for continuously crystallizing polyester material |
US5225130A (en) * | 1990-10-30 | 1993-07-06 | Hoechst Aktiengesellschaft | Process for reclaiming thermally strained polyester scrap material |
US5448074A (en) * | 1993-11-22 | 1995-09-05 | Seagro, Jr.; Thomas R. | Color region analyzer for detecting and separating polyvinyl chloride from polyethylene terephthalate |
US5590479A (en) * | 1992-08-11 | 1997-01-07 | Buhler Ag | Method for continuously crystallizing and polymerizing synthetic material and a device for it |
US5597852A (en) * | 1993-04-30 | 1997-01-28 | Polymer Engineering Gmbh | Method and apparatus for reprocessing solid polyester material |
US5807932A (en) * | 1994-10-14 | 1998-09-15 | Ciba Specialty Chemicals Corporation | Increasing the molecular weight of polycondensates |
WO1998044029A1 (en) * | 1997-04-02 | 1998-10-08 | The Coca-Cola Company | Process for removing contaminants from polyesters and controlling polymer molecular weight |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5504121A (en) * | 1992-05-18 | 1996-04-02 | Swig Pty Ltd. | Polyethylene terephthalate decontamination |
US5899392A (en) * | 1996-11-12 | 1999-05-04 | Plastic Technologies, Inc. | Decontamination of RPET through particle size reduction |
US5886058A (en) * | 1997-02-03 | 1999-03-23 | Illinois Tool Works Inc. | Inline solid state polymerization of pet flakes for manufacturing plastic strap |
-
1999
- 1999-11-08 DE DE1999153659 patent/DE19953659A1/de not_active Withdrawn
-
2000
- 2000-08-09 EP EP00947735A patent/EP1234001A1/de not_active Withdrawn
- 2000-08-09 WO PCT/CH2000/000427 patent/WO2001034688A1/de not_active Application Discontinuation
- 2000-08-09 AU AU61451/00A patent/AU6145100A/en not_active Abandoned
- 2000-08-09 US US10/129,591 patent/US6730774B1/en not_active Expired - Lifetime
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3804811A (en) * | 1972-04-12 | 1974-04-16 | Horizons Inc | Shaped articles from reconstituted polyester |
US5090134A (en) * | 1988-12-23 | 1992-02-25 | Buhler Ag | Method and apparatus for continuously crystallizing polyester material |
EP0376119A2 (de) * | 1988-12-27 | 1990-07-04 | COBARR S.p.A. | Verfahren zur Wiederverwendung von PET-Getränkeflaschen |
DE4015951A1 (de) * | 1990-05-18 | 1991-11-21 | Fernholz Gmbh & Co Kg W & H | Verfahren zum sortieren von bechern aus kunststoff |
US5225130A (en) * | 1990-10-30 | 1993-07-06 | Hoechst Aktiengesellschaft | Process for reclaiming thermally strained polyester scrap material |
US5590479A (en) * | 1992-08-11 | 1997-01-07 | Buhler Ag | Method for continuously crystallizing and polymerizing synthetic material and a device for it |
US5597852A (en) * | 1993-04-30 | 1997-01-28 | Polymer Engineering Gmbh | Method and apparatus for reprocessing solid polyester material |
US5448074A (en) * | 1993-11-22 | 1995-09-05 | Seagro, Jr.; Thomas R. | Color region analyzer for detecting and separating polyvinyl chloride from polyethylene terephthalate |
US5807932A (en) * | 1994-10-14 | 1998-09-15 | Ciba Specialty Chemicals Corporation | Increasing the molecular weight of polycondensates |
WO1998044029A1 (en) * | 1997-04-02 | 1998-10-08 | The Coca-Cola Company | Process for removing contaminants from polyesters and controlling polymer molecular weight |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004095390A3 (en) * | 2003-04-02 | 2006-08-17 | Phoenix Technologies Int | Method for preparing extremely small particles of recycled polyethylene terepathalate |
US7380735B2 (en) | 2003-04-02 | 2008-06-03 | Phoenix Technologies International, Llc | Method for preparing extremely small particles of recycled polyethylene terephthalate |
Also Published As
Publication number | Publication date |
---|---|
DE19953659A1 (de) | 2001-05-10 |
AU6145100A (en) | 2001-06-06 |
EP1234001A1 (de) | 2002-08-28 |
US6730774B1 (en) | 2004-05-04 |
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