WO2010086664A2 - Recyclage - Google Patents

Recyclage Download PDF

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Publication number
WO2010086664A2
WO2010086664A2 PCT/GB2010/050142 GB2010050142W WO2010086664A2 WO 2010086664 A2 WO2010086664 A2 WO 2010086664A2 GB 2010050142 W GB2010050142 W GB 2010050142W WO 2010086664 A2 WO2010086664 A2 WO 2010086664A2
Authority
WO
WIPO (PCT)
Prior art keywords
article
heating
pressure
contaminated
temperature
Prior art date
Application number
PCT/GB2010/050142
Other languages
English (en)
Other versions
WO2010086664A3 (fr
Inventor
Justin Chieffo
Michele Chieffo
Original Assignee
Be Eco Uk Limited
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Be Eco Uk Limited filed Critical Be Eco Uk Limited
Publication of WO2010086664A2 publication Critical patent/WO2010086664A2/fr
Publication of WO2010086664A3 publication Critical patent/WO2010086664A3/fr

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
    • B03B1/02—Preparatory heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B15/00—Combinations of apparatus for separating solids from solids by dry methods applicable to bulk material, e.g. loose articles fit to be handled like bulk material
    • 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
    • B29B17/0026—Recovery of plastics or other constituents of waste material containing plastics by agglomeration or compacting
    • 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
    • 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
    • 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
    • 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
    • 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
    • C08J11/10—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
    • C08J11/12—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by dry-heat treatment only
    • 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
    • B29B2017/0217—Mechanical separating techniques; devices therefor
    • B29B2017/0224—Screens, sieves
    • 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
    • B29B2017/0424—Specific disintegrating techniques; devices therefor
    • B29B2017/0472—Balls or rollers in a container
    • 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
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/10—Thermosetting resins
    • 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
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/12—Thermoplastic materials
    • 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
    • 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
    • B29K2711/00—Use of natural products or their composites, not provided for in groups B29K2601/00 - B29K2709/00, for preformed parts, e.g. for inserts
    • B29K2711/12—Paper, e.g. cardboard
    • 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
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B29L2007/008—Wide strips, e.g. films, webs
    • 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
    • B29L2031/7128—Bags, sacks, sachets
    • 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
    • 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
    • Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
    • 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

  • the present invention relates to methods of recycling waste streams, for example, the recycling of such streams comprising or consisting of plastics and to recycling materials such as plastics and further relates to articles made from recycled materials.
  • plastics that arrive at processing plants for recycling are, however, contaminated in some way by its previous use.
  • plastics that have been used in packaging are often contaminated with organic material such as paper or card, or food and other perishable material.
  • Some known recycling processes require the contaminants to be removed by hand. Bales of material for recycling are typically opened upon arrival at a recycling plant to be visually inspected for contamination. Large and/or handlable contaminants may be removed from the plastic, which may then be passed on for processing. However, this step is expensive and time consuming. Moreover, where contaminants are legion or cannot be manually removed (or if it is too difficult to do so), the plastics material is deemed low-grade and is usually incinerated or sent to landfill.
  • Such high grade plastics waste may be melted as it is passed through an extruder and, as the stream of material emerges from the extruder, it is pelletised (i.e. it is cut into pellets).
  • pellets may be used to form articles by melting and employing such processes as blowing or injection moulding.
  • the pellets may be mixed with further materials and subjected to a second melt extrusion step to provide modified pellets for use in a blowing or injection moulding process.
  • the present invention provides a method of recycling a contaminated article comprising heating the contaminated article to a temperature at a pressure to at least partially decontaminate the article and at least partially alter the physical form of the article to provide a second article.
  • the heating step comprises heating the contaminated article to a first temperature at a first pressure and to a second temperature at a second pressure.
  • the article is comprised of a plastics material.
  • the article may be contaminated by one or more contaminant.
  • a second aspect of the invention provides a method for recycling contaminated material comprising heating the material to a first temperature at a first pressure then heating the material to a second higher temperature at a second higher pressure.
  • the first heating step is predominantly a decontamination and/or delamination step.
  • the second heating step is predominantly a form-altering, e.g. shrinkage, step.
  • a form-altering e.g. shrinkage
  • thermoplastic materials may shrink, whereas thermoset materials may not, which may aid subsequent separation processes, especially if the contaminated material has all been shredded to a nominal, uniform, size prior to shrinkage.
  • the material is preferably a plastics material, such as that used in packaging and/or plastic carrier bags, polypropylene, PET, high density polyethylene (HDPE) or low density polyethylene (LDPE).
  • the contaminants may include fibrous materials such as paper or cardboard, food waste, adhesives, industrial, municipal or household waste.
  • the contaminants may also include thermoset plastics materials.
  • the contaminants may be at least partially adhered to or at least partially contained within the material or entrained with a stream of the material.
  • the methods of the present invention may be tolerant of a relatively wide variety of contaminated waste streams.
  • the waste steam may comprise from 25% to 100% by volume, preferably from 50% to 90% by volume, more preferably from 55% to 85% by volume, most preferably from 60% to 80% by volume, of recyclable plastics material.
  • the heating of the material under pressure at least partially removes the material from any contaminants that may be attached to it, thereby allowing for a separation of the material from the contaminants. Moreover, the contaminants are prevented from charring or burning, which can have a detrimental effect on the quality of the end product and/or reduce the efficacy of the recycling process.
  • the heating step or steps are performed in the presence of water.
  • the first pressure is elevated with respect to ambient or atmospheric pressure.
  • any contaminants which are adhered to the material are at least partially detached from the material during the heating step.
  • the material is divided, e.g. shredded prior to the heating step or one of the heating steps.
  • the material may be divided, e.g. shredded, after the heating step.
  • Shredding the contaminated material prior to heating may be especially advantageous, particularly in cases where the waste stream comprises carrier bags or other packaging materials, which may contain contaminants. For example, shredding such material may "open up" carrier bags to expose contaminants such as discarded receipts and food waste.
  • shredding may be particularly beneficial in cases where the waste stream comprises thermoplastic as well as thermoset plastics materials.
  • the waste stream comprises thermoplastic as well as thermoset plastics materials.
  • shredding may be particularly beneficial in cases where the waste stream comprises objects containing liquids, e.g. discarded plastic bottles or plastic containers of milk or the like which has passed its sell-by date, or has a large moisture content, as the liquid or moisture may be removed, e.g. drained, from the stream after shredding. More aggressive forms of moisture removal may additionally or alternative be deployed such as by crushing, squeezing or compressing, e.g. using one or more rollers or other suitable means. Should such a moisture removal step be employed, the stream may be subsequently agitated, preferably before heating, to at least partially reduce the density of the stream.
  • More aggressive forms of moisture removal may additionally or alternative be deployed such as by crushing, squeezing or compressing, e.g. using one or more rollers or other suitable means. Should such a moisture removal step be employed, the stream may be subsequently agitated, preferably before heating, to at least partially reduce the density of the stream.
  • the material is irradiated with infra-red and/or microwave radiation prior to or after the or a first heating step, as the or a first or second heating step, or after the or a second heating step.
  • the infra-red and/or microwave treatment has been found to shrink the material, e.g. the plastics material, which may increase the exposure of the contaminants to heat and pressure during the heating step.
  • the shrunken material may be separated from the contaminant, e.g. by filtration, following the irradiation step which results in a decontaminated material, and negates the need to carry out any further steps.
  • the or at least one of the heating steps is preferably carried out in an autoclave, for example a rotary autoclave.
  • the autoclave may contain a plurality of particles for abrading the contaminants from the material.
  • These particles are preferably of irregular shape and may, for example, be formed from metal or any other substance which will remain hard and abrasive at the temperature of the heating step.
  • the or at least one of the heating steps takes place in the presence of water.
  • the first temperature is between 90 0 C and 140 0 C and more preferably between 1 10 0 C and 140 0 C.
  • the first pressure is between 0.15 MPa and 2 MPa and more preferably between 0.2 MPa and 0.5 MPa, for example 0.3 MPa.
  • the material is held at the first temperature and the first pressure for up to 30 minutes. More preferably, the material is held at the first temperature and the first pressure for between 5 and 25 minutes, say, between 15 and 20 minutes.
  • the second temperature is between 140 0 C and 200 0 C, and more preferably between 140 0 C and 160 0 C.
  • the second pressure is between 0.15 MPa and 2 MPa and more preferably between 0.2 MPa and 0.5 MPa, for example 0.3 MPa.
  • the material is held at the second temperature and the second pressure for up to 30 minutes. More preferably, the material is held at the second temperature and second pressure for between 5 and 25 minutes, say, between 10 and 15 minutes.
  • the material is dried after the heating steps. This may be performed by, for example, irradiating the material with infra-red and/or microwave radiation. In certain embodiments, the material may be ground to aid removal of residual moisture.
  • organic material may be used as biomass.
  • the method comprises using the material after the heating step to form new products.
  • the products may be, for example, pellets of material for further processing, as may be formed by extrusion of the material.
  • the material may be used to form end products without any further processing such as extruding.
  • the material may be introduced to a blower for melting and forming into bags.
  • the end products may be manufactured from a mixture of recycled and virgin material, for example, a 50:50 mixture.
  • the amount of virgin material used may be minimised, e.g. end products of satisfactory quality may be made from a
  • the pellets of the recycled material may be processed before forming into end products, e.g. the pellets may be chopped, ground or sliced. This may be done to provide pellets within a narrow or at least narrower size distribution.
  • the invention provides an article formed from material recycled according to the method described herein.
  • the invention provides a carrier bag formed from material recycled according to the method described herein.
  • the present invention provides a method for recycling a contaminated material comprising heating the material to a first temperature at a first pressure.
  • the present invention provides a method of recycling a contaminated article comprising heating and/or irradiating the article to at least partially decontaminate the article, wherein the heating and/or the irradiation steps at least partially alter the physical form of the article and/or the contaminant thereof.
  • the method may further comprise a separation step, e.g. filtration or screening.
  • the present invention provides a method for recycling a contaminated plastics material comprising providing a waste stream of contaminated plastics material and treating the stream to at least partially alter the physical characteristics of the plastics component of the stream relative to those of the contaminants to cause separation, or at least start to separate, the plastics material from the contaminant.
  • a further aspect of the invention provides a method for recycling a contaminated plastics material comprising: providing a waste stream of contaminated plastics material; shredding the waste stream to provide shredded material; and heating the shredded material, preferably in an autoclave, at a first temperature and pressure for a first period of time. Preferably, the shredded material may then be heated at a second temperature and pressure for a second period of time, the second temperature being higher than the first temperature.
  • Figure 1 displays a flow chart of steps of a prior art recycling process.
  • Figure 2 displays a flow chart of steps of a recycling method according to the invention.
  • Figure 3 shows a schematic drawing of the apparatus of the invention.
  • the present invention provides an efficient process for recycling materials, such as plastics materials.
  • a consignment of waste polyethylene material is obtained.
  • This material might comprise such articles as used plastic carrier bags and pallet wrap.
  • waste polyethylene material is typically contaminated with other waste materials, including food waste, say, from food once held within or packaged by the material, and paper and cardboard which may have been used as labelling or come from discarded receipts and the like.
  • contaminated polyethylene may be processed without a manual removal of the contaminants, as is demonstrated schematically in Figure 2.
  • the contaminants may be processed such that they may be themselves recycled or used, inter alia, as fuel, rather than being charred or removed for incineration.
  • the obtained consignment of polyethylene is shredded to produce an easily processable material stream and ensuring that at least some of the contaminant material is at least partially exposed and/or is not trapped within the polyethylene during the one or more further treatment steps.
  • the shredded polyethylene is then placed on a conveyor belt which is passed under a source of infra-red radiation. The polyethylene shrinks when exposed to the infra-red radiation and residual water evaporates.
  • the conveyor deposits the polyethylene material into a rotary autoclave, which contains a plurality of irregular sided stainless steel abrasion balls. Water is added to the autoclave, which is sealed and then held at a first temperature and a first pressure for up to 30 minutes. As the autoclave turns, the abrasion balls abrade the polyethylene, cleaning off firmly attached contaminants. Moreover, the heat and moisture help to break down the contaminants. Paper based contaminants, for example, are broken down to fibrous form.
  • the autoclave is then held at a second temperature and a second pressure for a period (for example, up to 15 minutes).
  • a period for example, up to 15 minutes.
  • the contents of the autoclave are then removed and the agglomerate particles may be separated from the broken-down contaminant material, which may be in the form of a sludge. This is performed by a separation stage, e.g. by filtration, an air separation system, flotation or otherwise.
  • a separation stage e.g. by filtration, an air separation system, flotation or otherwise.
  • the contaminated material may first be shredded to an easily processable material stream.
  • the material may be either exposed to infra-red radiation in order to shrink the plastics material or deposited into a rotary autoclave to reduce the size of the contaminant material.
  • the choice of step depends on the nature of the material stream. For example, a decision may be influenced by the percentage and/or nature of the contaminant.
  • the mixture may then be separated, for example, by filtration.
  • the contaminant material may be reserved for other uses. If a consignment of polyethylene is known to be contaminated predominantly with paper, for example, the broken down contaminant may be pulped for use in making recycled paper. Alternatively, the contaminant may be used as biomass for generating heat and/or electricity.
  • the agglomerate particles of polyethylene are loaded onto a second conveyor for further drying under infra-red radiation.
  • moisture may be present within the agglomerate particles themselves, they may be cut, shredded or milled prior to exposure to infra-red and/or microwave radiation.
  • the dried agglomerates are suitable for moulding and/or blowing directly into new articles, without any need for further extrusion or other processing. Moreover, their pellet-like size and appearance ensures ease of handling by manufacturers used to dealing in raw materials supplied as pellets.
  • the agglomerates may be desirable to extrude the agglomerates to produce pellets, such as pellets of a particular dimension as may be required for certain processes.
  • the size of the agglomerates typically allows for smooth running of extrusion equipment.
  • FIG. 3 shows schematically an example of an apparatus according to the invention.
  • the apparatus comprises a shredder 1 , a rotary autoclave 2, a first conveyor belt 3a, a second conveyor belt 3b, a first vibrating screen 4 and a second vibrating screen 5.
  • a steam of contaminated waste material WS is introduced to the shredder 1.
  • the shredder 1 shreds contaminated waste material supplied thereto into pieces of a nominal size.
  • the shredded material is then transferred by the first conveyor belt 3a to the rotary autoclave 2, in which it is subjected to a heat treatment in accordance with the invention.
  • moisture of liquid may be removed, e.g. drained, from it.
  • liquid may be drained off before the shredded material is removed from the shredder. This step may be particularly advantageous, where the waste stream includes containers of liquid which has passed its sell-by date.
  • the treated pieces of material are transferred by the second conveyor belt 3b to the first vibrating screen 4.
  • the materal may be irradiated with infra-red radiation IR1 , IR2 while on the first conveyor belt 3a and/or the second conveyor belt 3b.
  • the first vibrating screen 4 comprises holes (not shown) therethrough.
  • the dimensions of the holes are selected so that pieces of material, which did not shrink in the rotary autoclave 2, e.g. pieces of thermoset plastics materials cannot pass through the first vibrating screen 4.
  • the material that passes through the first vibrating screen 4 will comprise pieces of thermoplastic materials that shrunk in the rotary autoclave 2 and smaller contaminants, e.g. organic materials. This material passes on to the second vibrating screen 5.
  • the second vibrating screen 5 comprises holes (not shown) therethrough. The dimensions of the holes are selected so that the thermoplastic materials which shrunk in the autoclave 2 cannot pass through. The contaminants, which tend to be smaller, will pass through the holes in the second vibrating screen 5.
  • a first stream 6 comprises thermoset plastics materials, which can be re-used or disposed of appropriately.
  • a second stream 7 comprises thermoplastic materials, which can be used in the manufacture of recycled articles such as carrier bags or pallet wrap.
  • a third stream 8 comprises organic contaminants, which can be used as biomass for energy generation.
  • a bale of used supermarket carrier bags was obtained and shredded in a shredder, e.g. a shredder of the type used for shredding film material, without prior cleaning or removal of contaminants.
  • the bale contains contaminants such as organic matter, food waste or scraps, paper, cardboard, stickers, liquids, gunk and leaves, which may be contained within the carrier bags, adhered to the inside or outside of the carrier bags or located between the carrier bags.
  • the carrier bags make up around 70% to 80% by volume of the bale.
  • the material was then introduced to a rotary autoclave containing irregular sided abrasive metal particles having an average diameter of between 10cm and 100cm. Either steam was pumped into the autoclave or clean water was introduced and heated. The autoclave was rotated while held at 130 0 C at 0.2 MPa for 15 minutes. The temperature was then increased to 160 0 C at 0.4 MPa for a further 10 minutes, after which the system was allowed to cool.
  • the plastic material had formed pellets which were removed and placed under an infrared lamp until dry. The plastic pellets were subsequently blown into new carrier bags o without further treatment.
  • a bale of used pallet-wrap was shredded in a shredder to a uniform size without prior cleaning or removal of contaminants.
  • the resulting shredded material was placed on a5 conveyor and exposed to infra-red radiation by passing under an IR lamp set to a wavelength so the plastic material shrivelled and separated from the contaminant material.
  • the material was then introduced to a filter to remove the larger contaminant material from the plastics material. 0
  • the isolated plastics material was subsequently formed into new pallet wrap without further treatment.
  • a bale of mixed plastics waste including thermoplastic and thermoset components and5 organic contaminants at about 25% w/w, was shredded in a shredder to a uniform size, nominally 50mm x 50mm, without prior cleaning or removal of contaminants.
  • the shredded material was then introduced to a rotary autoclave containing irregular sided abrasive metal particles having an average diameter of from 10cm to 100cm and, optionally, additional absorbent matter if required.
  • the material was removed from the autoclave and dried, before being separated using vibrating screens.
  • a first screen having a nominal mesh size of 2cm x 2cm was used to separate out the shredded thermoset component which were mostly unaffected by the heat treatment.
  • the shredded thermoplastic component shrinks in the autoclave, typically into the form of pellet-like bodies having dimensions which will pass through the first screen.
  • the pellet-like bodies may have dimensions of from less than 2cm x 2cm, e.g. about 1.5cm x 0.5cm to 0.25 x 0.25cm. In this instance, the pellets had an average size of about 1.2cm x 0.6cm.
  • the organic materials are partially digested.
  • thermoplastic pellet-like bodies were subsequently used with some virgin material to produce new products through extrusion or moulding.
  • a 90:10 mixture of pellets of recycled and virgin material was extruded.
  • the contaminants, e.g. organic materials, can be used as biomass for energy generation.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Processing Of Solid Wastes (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Abstract

L'invention concerne un procédé de recyclage d'un article contaminé comprenant : le hachage et/ou le broyage de l'article contaminé; le chauffage de l'article contaminé à une certaine température et à une certaine pression pour décontaminer au moins partiellement l'article contaminé broyé et/ou pour au moins altérer partiellement la forme physique de l'article contaminé broyé afin de produire un second article. Le second article peut être utilisé pour la fabrication d'un produit final tel qu'un sac.
PCT/GB2010/050142 2009-01-29 2010-01-29 Recyclage WO2010086664A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0901461A GB2467528A (en) 2009-01-29 2009-01-29 Recycling materials such as plastics
GB0901461.4 2009-01-29

Publications (2)

Publication Number Publication Date
WO2010086664A2 true WO2010086664A2 (fr) 2010-08-05
WO2010086664A3 WO2010086664A3 (fr) 2010-09-23

Family

ID=40469258

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2010/050142 WO2010086664A2 (fr) 2009-01-29 2010-01-29 Recyclage

Country Status (2)

Country Link
GB (1) GB2467528A (fr)
WO (1) WO2010086664A2 (fr)

Cited By (1)

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CN107627487A (zh) * 2017-09-28 2018-01-26 王占舟 一种减少塑料味的废旧塑料清洗方法

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Publication number Priority date Publication date Assignee Title
CN112888541B (zh) 2018-08-01 2023-03-28 瑞派科创新有限公司 分离多层塑料层的方法

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GB292213A (en) * 1927-03-10 1928-06-11 Johannes Van Loon An improved manufacture of activated carbons and decolorising charcoals
GB1453851A (en) * 1973-07-18 1976-10-27 Boc International Ltd Cover removal
EP0631537B1 (fr) * 1992-01-27 1996-06-26 FLEISCHHAUER, Rosa Emilia Procede et dispositif pour la collecte et la regranulation de dechets contenant des matieres plastiques etirees
JPH0892411A (ja) * 1994-09-19 1996-04-09 Mitsubishi Chem Corp ポリオレフィンの回収方法
AU2002324201A1 (en) * 2001-09-19 2003-04-01 Slane Environmental Limited Waste treatment
JP2003191237A (ja) * 2001-12-26 2003-07-08 Mitsui Sekitan Ekika Kk 廃プラスチックの減容化方法
US20050261119A1 (en) * 2004-05-18 2005-11-24 Sabrina Pichee Chen Tri-fold plastic bag roll, method and apparatus for making same
GB0501864D0 (en) * 2005-01-31 2005-03-09 3Dm Environmental Ltd Treatment and recovery of waste

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107627487A (zh) * 2017-09-28 2018-01-26 王占舟 一种减少塑料味的废旧塑料清洗方法

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GB2467528A (en) 2010-08-11
GB0901461D0 (en) 2009-03-11
WO2010086664A3 (fr) 2010-09-23

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