WO2004094125A2 - Improved method for treating recycled polyethylene terephthalate - Google Patents
Improved method for treating recycled polyethylene terephthalate Download PDFInfo
- Publication number
- WO2004094125A2 WO2004094125A2 PCT/US2004/007955 US2004007955W WO2004094125A2 WO 2004094125 A2 WO2004094125 A2 WO 2004094125A2 US 2004007955 W US2004007955 W US 2004007955W WO 2004094125 A2 WO2004094125 A2 WO 2004094125A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rpet
- treating
- particles
- flakes
- low energy
- Prior art date
Links
Classifications
-
- 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
-
- 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
- B29B17/04—Disintegrating plastics, e.g. by milling
-
- 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
- B29C48/285—Feeding the extrusion material to the extruder
- B29C48/287—Raw material pre-treatment while feeding
-
- 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
- B29B9/00—Making granules
- B29B9/12—Making granules characterised by structure or composition
- B29B2009/125—Micropellets, microgranules, microparticles
-
- 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
- B29B9/00—Making granules
- B29B9/16—Auxiliary treatment of granules
- B29B2009/165—Crystallizing granules
-
- 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
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
-
- 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
- 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
-
- 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
- B29K2105/26—Scrap or recycled material
-
- 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
Definitions
- This invention relates generally to an improved method for treating recycled polyethylene terephthalate (RPET) . More particularly, the invention is directed to a method for treating RPET so that it can be melted utilizing low energy processing equipment or thermally treated more quickly with less energy.
- RPET recycled polyethylene terephthalate
- Post-consumer processing of recycled PET to manufacture a variety of low-tech consumer products such as flower pots and fence posts is well-known.
- the recycling process utilizes used PET containers, such as discarded carbonated beverage containers, which are collected, sorted, washed, and separated from contaminants to yield a relatively clean source of RPET.
- used PET containers such as discarded carbonated beverage containers
- the manufacture of imperfect and damaged molded PET products, particularly the blow molded bottles used for containing consumer goods results in a considerable amount of PET waste which the manufacturers of such products would like to reuse.
- the RPET produced by conventional recycling processes is generally in ground or flake form, which is thereafter melt processed or further pelletized by the end user.
- RPET is generally subjected to a grinding operation in order to make the material easier to handle and process.
- Conventional grinding equipment reduces the RPET to about 3/8 inch particles or flakes.
- the grinding is conducted in a manner to insure that a consistent flake size will be produced, by employing a grate or screen through which the ground material must pass upon exiting the grinder.
- conventional RPET flakes melt processing and pelletizing equipment is designed to handle 3/8 inch flakes, some RPET materials having sizes as large as l ⁇ inch and as small as U inch are also commercially produced.
- the bulk density of 3/8 inch flake RPET generally ranges from about 22 to about 35 pounds per cubic foot. Considerable post-processing of RPET is typically necessary for the manufacture of, for example, plastic containers.
- an improved process for thermally treating or preparing a melt from RPET, utilizing low energy processing equipment has surprisingly been discovered.
- the process comprises providing a quantity of RPET flakes, comminuting the
- RPET flakes to prepare RPET particles having an average mean particle size less than about 300 microns, and treating the RPET particles utilizing a low energy process selected from the group consisting of simultaneously melting and mixing the RPET particles by means of a low energy melting device to prepare an RPET melt, and thermally treating the RPET particles to dry or crystallize the RPET particles.
- the inventive process is particularly useful for treating RPET flakes for the subsequent processing and forming of, for example, plastic containers.
- the present invention is directed to a process for treating RPET flakes utilizing low energy processing equipment, comprising providing a quantity of RPET flakes, comminuting the RPET flakes to prepare.
- RPET particles having an average mean particle size less than about 300 microns, and treating the RPET particles utilizing a low energy process selected from the group consisting of simultaneously melting and mixing the RPET particles by means of a low energy melting device to prepare an RPET melt, and thermally treating the RPET particles ⁇ to dry or crystallize the RPET particles.
- RPET flakes generally the commercially available recycled polyethylene terephthalate materials produced by conventional polyethylene terephthalate recycling methods, usually in flake form, but which may additionally be in the form of chunks, spheres, pellets, and the like, and which are generally made available in bulk in a substantially uniform particle size from about Vi inch to about % inch.
- a quantity of RPET flakes is provided for further processing.
- the quantity of RPET flakes provided in the initial step of the inventive process may easily be determined by a routineer in the art of polymer processing, depending upon the quantity of RPET ultimately desired.
- the RPET flakes are comminuted by any conventional means, to prepare RPET particles having an average mean particle size less than about 300 microns.
- Methods and apparatus for comminuting RPET and other polymers are well known in the art .
- the resultant RPET particles are treated, utilizing a low energy process.
- the low energy process may comprise either the preparation of an RPET melt or the thermal processing of the RPET particles to effect their drying and crystallization.
- the RPET particles are simultaneously melted and mixed utilizing conventional low energy equipment such as, for example, a 2 -roll mill, a heated casting roll, a rotating mandrel to effect frictional melting, or the like.
- conventional low energy equipment such as, for example, a 2 -roll mill, a heated casting roll, a rotating mandrel to effect frictional melting, or the like.
- the resultant RPET polymer melt is beneficial for combining with other polymer materials for subsequent melt processing ' and forming operations.
- the addition of the inventive RPET melt to a quantity of virgin polyethylene terephthalate (PET) will extend the volume of the virgin PET.
- the RPET particles are thermally treated to dry and/or crystallize same. This may be achieved by conventional means such as, for example, heating the mass of RPET particles to a temperature below the melt temperature of polyethylene terephthalate. This' heating may be accomplished, for example, by passing a gas over or through the bed of RPET particles. Examples of useful gases include, but are not limited to, air, nitrogen, argon, and the like, as well as mixtures thereof.
- RPET flakes have formerly been dried and/or crystallized in heated chambers for required periods of time up to about five hours.
- the present inventive process again. benefits from the large surface-to-volume ratio of the RPET particles, to achieve the same levels of dryness and/or crystallinity in approximately fifteen minutes; thus requiring less energy and time to accomplish the same result .
- the process for treating RPET flakes utilizing low energy processing equipment described hereinabove is generally disclosed in terms of its broadest application to the practice of the present invention. Occasionally, the process conditions as described may not be precisely applicable to each RPET flake and low energy process combination included within the disclosed scope . Those instances where this occurs, however, will be readily recognized by those ordinarily skilled in the art. In all such cases, the process may be successfully performed by conventional modifications to the disclosed method.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
MXPA05010512A MXPA05010512A (en) | 2003-04-02 | 2004-03-12 | Improved method for treating recycled polyethylene terephthalate. |
CA 2520872 CA2520872A1 (en) | 2003-04-02 | 2004-03-12 | Improved method for treating recycled polyethylene terephthalate |
AU2004232712A AU2004232712A1 (en) | 2003-04-02 | 2004-03-12 | Improved method for treating recycled polyethylene terephthalate |
US10/550,246 US20060189789A1 (en) | 2003-04-02 | 2004-03-12 | Method for treating recycled polyethylene terephthalate |
BRPI0409004-7A BRPI0409004A (en) | 2004-03-12 | 2004-03-12 | process for treating rpet flakes |
EP04759609A EP1608495A4 (en) | 2003-04-02 | 2004-03-12 | Improved method for treating recycled polyethylene terephthalate |
NZ542679A NZ542679A (en) | 2003-04-02 | 2004-03-12 | A process for treating recycled polyethylene terephthalate (RPET) flakes |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US45990403P | 2003-04-02 | 2003-04-02 | |
US60/459,904 | 2003-04-02 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2004094125A2 true WO2004094125A2 (en) | 2004-11-04 |
WO2004094125A3 WO2004094125A3 (en) | 2005-03-10 |
Family
ID=33310714
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2004/007955 WO2004094125A2 (en) | 2003-04-02 | 2004-03-12 | Improved method for treating recycled polyethylene terephthalate |
Country Status (7)
Country | Link |
---|---|
US (1) | US20060189789A1 (en) |
EP (1) | EP1608495A4 (en) |
AU (1) | AU2004232712A1 (en) |
CA (1) | CA2520872A1 (en) |
MX (1) | MXPA05010512A (en) |
NZ (1) | NZ542679A (en) |
WO (1) | WO2004094125A2 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3728309A (en) * | 1969-06-13 | 1973-04-17 | Mobil Oil Corp | Progressive heating in polyester condensations |
US3804811A (en) * | 1972-04-12 | 1974-04-16 | Horizons Inc | Shaped articles from reconstituted polyester |
FR2700136B1 (en) * | 1993-01-05 | 1997-01-10 | Pierre Moreau | Process and device for recycling plastics. |
DE19953659A1 (en) * | 1999-11-08 | 2001-05-10 | Buehler Ag | Method and device for decontaminating polycondensates |
CA2406710A1 (en) * | 2000-05-02 | 2001-11-08 | Plastic Technologies Inc. | Improved decontamination of rpet through particle size reduction |
DE60115404T2 (en) * | 2001-01-04 | 2006-08-03 | Plastic Technologies, Inc., Holland | PROCESS FOR COOLING POSTREACTOR POLYETHYLENEPEPHTHALATE |
-
2004
- 2004-03-12 CA CA 2520872 patent/CA2520872A1/en not_active Abandoned
- 2004-03-12 NZ NZ542679A patent/NZ542679A/en unknown
- 2004-03-12 AU AU2004232712A patent/AU2004232712A1/en not_active Abandoned
- 2004-03-12 US US10/550,246 patent/US20060189789A1/en not_active Abandoned
- 2004-03-12 EP EP04759609A patent/EP1608495A4/en not_active Withdrawn
- 2004-03-12 WO PCT/US2004/007955 patent/WO2004094125A2/en active Application Filing
- 2004-03-12 MX MXPA05010512A patent/MXPA05010512A/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of EP1608495A4 * |
Also Published As
Publication number | Publication date |
---|---|
AU2004232712A1 (en) | 2004-11-04 |
EP1608495A2 (en) | 2005-12-28 |
US20060189789A1 (en) | 2006-08-24 |
WO2004094125A3 (en) | 2005-03-10 |
EP1608495A4 (en) | 2008-04-30 |
NZ542679A (en) | 2006-11-30 |
CA2520872A1 (en) | 2004-11-04 |
MXPA05010512A (en) | 2005-11-16 |
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