WO2000061669A1 - Conversion of plastics material into composite product - Google Patents

Conversion of plastics material into composite product Download PDF

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Publication number
WO2000061669A1
WO2000061669A1 PCT/GB2000/001262 GB0001262W WO0061669A1 WO 2000061669 A1 WO2000061669 A1 WO 2000061669A1 GB 0001262 W GB0001262 W GB 0001262W WO 0061669 A1 WO0061669 A1 WO 0061669A1
Authority
WO
WIPO (PCT)
Prior art keywords
plastics material
plastics
solid particulate
composite product
mixer
Prior art date
Application number
PCT/GB2000/001262
Other languages
French (fr)
Inventor
Donald Roy Crawley
Lesley Ann Teasdale
Original Assignee
Donald Roy Crawley
Lesley Ann Teasdale
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 Donald Roy Crawley, Lesley Ann Teasdale filed Critical Donald Roy Crawley
Priority to AU38275/00A priority Critical patent/AU3827500A/en
Publication of WO2000061669A1 publication Critical patent/WO2000061669A1/en

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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
    • B29B17/0026—Recovery of plastics or other constituents of waste material containing plastics by agglomeration or compacting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • B01F35/88—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/60—Mixing solids with solids
    • B01F23/64—Mixing solids with solids using rotatable mixing elements at the lower end of discharge hoppers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/71705—Feed mechanisms characterised by the means for feeding the components to the mixer using belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/7173—Feed mechanisms characterised by the means for feeding the components to the mixer using gravity, e.g. from a hopper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/7173—Feed mechanisms characterised by the means for feeding the components to the mixer using gravity, e.g. from a hopper
    • B01F35/71731—Feed mechanisms characterised by the means for feeding the components to the mixer using gravity, e.g. from a hopper using a hopper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/71805—Feed mechanisms characterised by the means for feeding the components to the mixer using valves, gates, orifices or openings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/75—Discharge mechanisms
    • B01F35/754—Discharge mechanisms characterised by the means for discharging the components from the mixer
    • B01F35/75415—Discharge mechanisms characterised by the means for discharging the components from the mixer using gravity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/75—Discharge mechanisms
    • B01F35/754—Discharge mechanisms characterised by the means for discharging the components from the mixer
    • B01F35/7547—Discharge mechanisms characterised by the means for discharging the components from the mixer using valves, gates, orifices or openings
    • 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
    • B03B9/00—General arrangement of separating plant, e.g. flow sheets
    • B03B9/06—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse
    • B03B9/061—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse the refuse being industrial
    • B03B9/063—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse the refuse being industrial the refuse being concrete slurry
    • 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
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/90—Heating or cooling systems
    • B01F2035/99—Heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/2805—Mixing plastics, polymer material ingredients, monomers or oligomers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • 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
    • Y02W30/58—Construction or demolition [C&D] waste
    • 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 to a method of converting plastics material into a composite product.
  • the invention is particularly suitable for the recycling of waste plastics material and other inorganic and/or organic material to produce a useful commodity.
  • This invention provides a method of converting plastics material into a composite product, which comprises heating the plastics material to a temperature above its softening point but below its decomposition point, mixing the plastics material with a solid particulate material so that the particles of the solid particulate material are encapsulated by the plastics material, then shaping and cooling the resulting composite product.
  • the plastics material can be selected from thermoplastic plastics materials and synthetic rubber. Suitable thermoplastics include polyethylene, polypropylene, ABS and poly amide. Polyethylene and polypropylene are particularly preferred. Any thermoplastics material can be used so long as its softening temperature is reached. This allows the plastics material to encapsulate the solid particulate material. Although waste plastics material is usually used, the invention is equally applicable to the treatment of virgin plastics.
  • the solid particulate material may be selected from sand, mineral waste, rubber and thermosetting plastics materials. Mineral waste can include virtually any particulate material, provided it remains solid at the mixing temperature used. Sand is preferred, but a variety of mineral wastes can also be used, such as filter dust, slag, oxides, stone, incinerator ash, ash (bottom or top), sludge, and any fines or aggregates.
  • the temperature of mixing is generally in the range of from 130-250°C. A preferred range is from 140-200°C, and the most preferred temperature is an average of 150°C.
  • the plastics material is mixed and blended with the solid particulate material.
  • the plastics material can consist of waste plastics which are unsheared, untreated, uncleaned and can consist of more than one type of polymer.
  • the plastics material can even be in the form of uncut continuous sheeting, of up to 100m or more in length.
  • the plastics material is mixed with one or more suitable solid particulate materials in a heated mixer having sufficient power to agitate and then encapsulate the particulate material with the plastics material. It is desirable to premix the plastics material with heated particulate material so as to reduce the volume of plastics material before entry into the mixer.
  • the mixer is generally provided with internal paddles which sweep the internal volume and provide thorough mixing.
  • the apparatus is able to handle large tonnages of materials, unlike conventional processes for recycling plastics.
  • the colour of the end product can be varied by adding coloured pigment, or by using coloured plastics material or solid particulate material.
  • the composite product which is produced in the mixing apparatus is generally shaped by application of pressure or by extrusion. A variety of shapes and/or surface patterns can thereby be produced in the product.
  • the product When the product has been cooled, it can be further worked, such as by machining or drilling. Products can also be reheated and joined together. The surface can be polished to give various appearances. The material can also be reheated to the softening temperatures mentioned above, and then remoulded. Suitable applications for the product include railway sleepers, fence posts, pallets, sea groins, insulation panels, roof and rafter tiles, manhole covers, paving slabs, sea defence and other blocks of a similar nature.
  • Figure 1 is a diagrammatic representation of one embodiment of apparatus used in the process of the invention.
  • Figure 2 is a diagrammatic representation of another embodiment; and Figure 3 shows two lateral cross sections and a diagrammatic plan view of a pre- mixer which can be used in the invention.
  • the mixer 1 is a paddle mixer known as a BC Batchpac Pugmill, manufactured by Barber-Greene Company, Illinois, USA. This has internal paddle arms with hardened paddle tips which sweep the internal volume.
  • the pugmill is piped for hot oil heating to maintain correct temperature during mixing.
  • a hopper 2 is positioned above the feed aperture of the mixer 1.
  • the hopper includes a lower chamber 3 which communicates with an upper reservoir 4 through an aperture.
  • Sand is heated to 150°C by conventional heating means (not shown) and stored in the reservoir 4.
  • the hot sand is fed in batches through the aperture into the chamber 3, and from there into the mixer 1.
  • a feed conveyor 5 carries waste plastics material into the chamber 3 through a side aperture. The weight and heat of the sand from the hopper above reduces the volume of the plastics material and brings the sand and plastics material together before entering the mixer. Once in the mixer, the plastics material is softened or melted so that it encapsulates the particles of sand.
  • FIG. 2 An alternative arrangement is shown in Figure 2.
  • the mixer 1 is the same as in Figure 1.
  • there are two separate conveyors a conveyor 6 for plastics material and a conveyor 7 for sand.
  • Heating lamps 8 are positioned above each of the conveyors. The heating of the plastics material on the conveyor 6 is not sufficient to soften it, as it might then adhere to the conveyor.
  • the plastics material mixes with the flow of heated sand from the conveyor 7, the volume of plastics material is reduced and the combined stream is fed into the mixer 1.
  • the plastics and particulate material are mixed in a pre-mixer before passing to the pugmill mixer.
  • the pre-mixer 9 has mixing blades 10 mounted on a rotating axle 11.
  • Mini mixing blades 12 are mounted on the ends of the main mixing blades 10, and extend to varying distances from the axle 11.
  • the pugmill mixer uses a batch mixing system. It holds 10-15 tonnes per batch and can make about 60 tonnes of product per hour.
  • the temperature is a constant 150°C.
  • the mixing takes about 10 minutes to complete, and produces a highly uniform mixed product.
  • the product is mixed at about 60 KNA/100 HP per tonne.
  • the mixing time is directly proportional to the power of the mixer and to the temperature.
  • the temperature is not permitted to rise substantially above 150°C, as that would result in burning of the plastics material.
  • Higher melting plastics or rubber can be mixed at a higher temperature, such as 210-220°C.
  • such materials are preferably mixed with polyethylene or polypropylene, in which case the average temperature is maintained at about 150°C.
  • the resulting composite product is a uniform product in which the particulate material is encapsulated by the plastics.
  • the mixer Periodically expels the product through its discharge aperture, into a hopper below.
  • the flowable material then enters a screw conveyor. All the equipment is connected to make a sealed unit, so as to prevent oxidation of the material.
  • the viscous material is conveyed by the screw conveyor into a pre-mould and compressed by a hydraulic ram through a reduced aperture, thereby screening out any large solid waste material, such as metals or thermosetting plastics.
  • the product from the mixer can be extruded into a shaped product. For example, extrusion can be used in this way to manufacture railway sleepers or fence posts from the composite product.
  • Household plastics and oversized plastic sheeting from farming and other industries including polypropylene, polyethylene, both low density and high density, are mixed at approximately 150°C under pressure in a mixing drum with a solid particulate material consisting of sand and/or ash. About 70% by weight sand and about 30% by weight of plastics are used.
  • thermoplastics are mixed with dried blast furnace sludge and other sludges from by-products of the steel industry. Sand may also be incorporated, the relative proportions then being 30% by weight of plastics, 60% by weight of sand and 10% by weight of dried blast furnace sludge.
  • Example 3
  • Waste thermoplastics as in the previous examples is mixed with crushed concrete and other inorgamc debris.

Abstract

A method of converting plastics material into a composite product comprises heating the plastics material to a temperature above its softening point but below its decomposition point, mixing the plastics material with a solid particulate material so that the particles of the solid particulate material are encapsulated by the plastics material, and then shaping and cooling the resulting composite product.

Description

CONVERSION OF PLASTICS MATERIAL INTO COMPOSITE
PRODUCT
This invention relates to a method of converting plastics material into a composite product. The invention is particularly suitable for the recycling of waste plastics material and other inorganic and/or organic material to produce a useful commodity.
Large quantities of waste plastics materials are generated, and disposing of these is a serious problem. Recycling of such waste materials is highly desirable. However, current proposals for recycling of waste plastics materials suffer from various disadvantages. Initial sorting into different types of plastics material may be required, and this adds considerably to costs. Some recycling processes require initial cutting or chopping of the waste plastics material, and this again adds to costs. It is also desirable to be able to handle large tonnages of materials, and most existing processes do not permit this. The present invention provides a solution to these problems.
This invention provides a method of converting plastics material into a composite product, which comprises heating the plastics material to a temperature above its softening point but below its decomposition point, mixing the plastics material with a solid particulate material so that the particles of the solid particulate material are encapsulated by the plastics material, then shaping and cooling the resulting composite product.
The plastics material can be selected from thermoplastic plastics materials and synthetic rubber. Suitable thermoplastics include polyethylene, polypropylene, ABS and poly amide. Polyethylene and polypropylene are particularly preferred. Any thermoplastics material can be used so long as its softening temperature is reached. This allows the plastics material to encapsulate the solid particulate material. Although waste plastics material is usually used, the invention is equally applicable to the treatment of virgin plastics. The solid particulate material may be selected from sand, mineral waste, rubber and thermosetting plastics materials. Mineral waste can include virtually any particulate material, provided it remains solid at the mixing temperature used. Sand is preferred, but a variety of mineral wastes can also be used, such as filter dust, slag, oxides, stone, incinerator ash, ash (bottom or top), sludge, and any fines or aggregates.
The temperature of mixing is generally in the range of from 130-250°C. A preferred range is from 140-200°C, and the most preferred temperature is an average of 150°C.
In the process of the invention, the plastics material is mixed and blended with the solid particulate material. The plastics material can consist of waste plastics which are unsheared, untreated, uncleaned and can consist of more than one type of polymer. The plastics material can even be in the form of uncut continuous sheeting, of up to 100m or more in length. The plastics material is mixed with one or more suitable solid particulate materials in a heated mixer having sufficient power to agitate and then encapsulate the particulate material with the plastics material. It is desirable to premix the plastics material with heated particulate material so as to reduce the volume of plastics material before entry into the mixer. The mixer is generally provided with internal paddles which sweep the internal volume and provide thorough mixing. There are no emissions, as the plastics material is not incinerated. Virtually the entire waste input is converted to product, so that there is total recycling. The apparatus is able to handle large tonnages of materials, unlike conventional processes for recycling plastics. The colour of the end product can be varied by adding coloured pigment, or by using coloured plastics material or solid particulate material.
The composite product which is produced in the mixing apparatus is generally shaped by application of pressure or by extrusion. A variety of shapes and/or surface patterns can thereby be produced in the product. When the product has been cooled, it can be further worked, such as by machining or drilling. Products can also be reheated and joined together. The surface can be polished to give various appearances. The material can also be reheated to the softening temperatures mentioned above, and then remoulded. Suitable applications for the product include railway sleepers, fence posts, pallets, sea groins, insulation panels, roof and rafter tiles, manhole covers, paving slabs, sea defence and other blocks of a similar nature.
Reference is now made to the accompanying drawings, in which:
Figure 1 is a diagrammatic representation of one embodiment of apparatus used in the process of the invention;
Figure 2 is a diagrammatic representation of another embodiment; and Figure 3 shows two lateral cross sections and a diagrammatic plan view of a pre- mixer which can be used in the invention.
Referring first to Figure 1, the mixer 1 is a paddle mixer known as a BC Batchpac Pugmill, manufactured by Barber-Greene Company, Illinois, USA. This has internal paddle arms with hardened paddle tips which sweep the internal volume. The pugmill is piped for hot oil heating to maintain correct temperature during mixing. There is a feed aperture at the top of the mixer, and a discharge gate at the bottom.
A hopper 2 is positioned above the feed aperture of the mixer 1. The hopper includes a lower chamber 3 which communicates with an upper reservoir 4 through an aperture. Sand is heated to 150°C by conventional heating means (not shown) and stored in the reservoir 4. The hot sand is fed in batches through the aperture into the chamber 3, and from there into the mixer 1. A feed conveyor 5 carries waste plastics material into the chamber 3 through a side aperture. The weight and heat of the sand from the hopper above reduces the volume of the plastics material and brings the sand and plastics material together before entering the mixer. Once in the mixer, the plastics material is softened or melted so that it encapsulates the particles of sand.
An alternative arrangement is shown in Figure 2. The mixer 1 is the same as in Figure 1. In this embodiment, there are two separate conveyors, a conveyor 6 for plastics material and a conveyor 7 for sand. Heating lamps 8 are positioned above each of the conveyors. The heating of the plastics material on the conveyor 6 is not sufficient to soften it, as it might then adhere to the conveyor. When the plastics material mixes with the flow of heated sand from the conveyor 7, the volume of plastics material is reduced and the combined stream is fed into the mixer 1.
In the embodiment shown in Figure 3, the plastics and particulate material are mixed in a pre-mixer before passing to the pugmill mixer. The pre-mixer 9 has mixing blades 10 mounted on a rotating axle 11. Mini mixing blades 12 are mounted on the ends of the main mixing blades 10, and extend to varying distances from the axle 11.
The pugmill mixer uses a batch mixing system. It holds 10-15 tonnes per batch and can make about 60 tonnes of product per hour. The temperature is a constant 150°C. The mixing takes about 10 minutes to complete, and produces a highly uniform mixed product. The product is mixed at about 60 KNA/100 HP per tonne. The mixing time is directly proportional to the power of the mixer and to the temperature. However, in the preferred embodiment of mixing mainly polyethylene with sand, the temperature is not permitted to rise substantially above 150°C, as that would result in burning of the plastics material. Higher melting plastics or rubber can be mixed at a higher temperature, such as 210-220°C. However, such materials are preferably mixed with polyethylene or polypropylene, in which case the average temperature is maintained at about 150°C.
The resulting composite product is a uniform product in which the particulate material is encapsulated by the plastics. Periodically the mixer expels the product through its discharge aperture, into a hopper below. The flowable material then enters a screw conveyor. All the equipment is connected to make a sealed unit, so as to prevent oxidation of the material. The viscous material is conveyed by the screw conveyor into a pre-mould and compressed by a hydraulic ram through a reduced aperture, thereby screening out any large solid waste material, such as metals or thermosetting plastics. As an alternative, the product from the mixer can be extruded into a shaped product. For example, extrusion can be used in this way to manufacture railway sleepers or fence posts from the composite product.
The invention is further illustrated by the following Examples.
Example 1
Household plastics and oversized plastic sheeting from farming and other industries, including polypropylene, polyethylene, both low density and high density, are mixed at approximately 150°C under pressure in a mixing drum with a solid particulate material consisting of sand and/or ash. About 70% by weight sand and about 30% by weight of plastics are used.
Example 2
Commercial or domestic waste thermoplastics are mixed with dried blast furnace sludge and other sludges from by-products of the steel industry. Sand may also be incorporated, the relative proportions then being 30% by weight of plastics, 60% by weight of sand and 10% by weight of dried blast furnace sludge. Example 3
Waste thermoplastics as in the previous examples is mixed with crushed concrete and other inorgamc debris.

Claims

1. A method of converting plastics material into a composite product, which comprises heating the plastics material to a temperature above its softening point but below its decomposition point, mixing the plastics material with a solid particulate material so that the particles of the solid particulate material are encapsulated by the plastics material, then shaping and cooling the resulting composite product.
2. A method according to Claim 1, in which the plastics material is a thermoplastic material or synthetic rubber.
3. A method according to Claim 1 or 2, in which the solid particulate material is selected from sand, mineral waste, rubber or thermosetting plastics.
4. A method according to any of Claims 1 to 3, in which the temperature is from 130-250°C.
5. A method according to any of Claims 1 to 4, in which from 20- 50% by weight of plastics material is mixed with from 80-50% by weight of solid particulate material.
6. A method according to any of Claims 1 to 5, in which the plastics material is heated by mixing it with the solid particulate material which has been pre-heated.
PCT/GB2000/001262 1999-04-08 2000-04-07 Conversion of plastics material into composite product WO2000061669A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU38275/00A AU3827500A (en) 1999-04-08 2000-04-07 Conversion of plastics material into composite product

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9908038A GB9908038D0 (en) 1999-04-08 1999-04-08 The ct system
GB9908038.4 1999-04-08

Publications (1)

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GB (1) GB9908038D0 (en)
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002016098A1 (en) * 2000-08-25 2002-02-28 Pasell S.R.L. Process for the production of manufactures and manufactures obtained with such process
EP1354681A1 (en) * 2002-04-15 2003-10-22 Bobo Holding B.V. Moulded product comprising a thermoplastic component and a particulate filler material and method for producing the same
ES2212734A1 (en) * 2002-12-20 2004-07-16 Julio Beascoechea Bernaola High density counterweights production system includes e.g. polypropylene binder and a mineral composition
AU2001269376B2 (en) * 2000-06-16 2006-05-18 Gibson, Fabin W. Timing belt autotensioner with an anti-tooth skip mechanism
ES2333083A1 (en) * 2008-01-16 2010-02-16 Jose Mauri Chacon Plastic compacted by means of polymerization by addition. (Machine-translation by Google Translate, not legally binding)
WO2019049171A1 (en) * 2017-09-06 2019-03-14 Hindura Infrastructure Pvt. Ltd. A process and a system for manufacturing of tiles/blocks from waste plastics

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WO1994000252A1 (en) * 1992-06-26 1994-01-06 Atelier De Constructions Electriques Du Sundgau S.A.R.L. Method and machine for compacting waste containing thermoplastic materials
DE4340188A1 (en) * 1993-11-25 1995-06-01 Helmut Hiendl Concrete polymer prodn. from thermoplastic
DE4433961A1 (en) * 1994-09-23 1996-03-28 Phoenix Ag Polyethylene and milled rubber blends, esp. recycled material, for prodn. of moulded articles and sheet materials
WO1996017807A1 (en) * 1994-11-28 1996-06-13 Vesa Keskisarja Method for producing filling compound from warm filling material such as waste and recoverable plastics

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993008974A1 (en) * 1991-11-08 1993-05-13 Alun Roy Williams Shaped articles and methods for making them
WO1994000252A1 (en) * 1992-06-26 1994-01-06 Atelier De Constructions Electriques Du Sundgau S.A.R.L. Method and machine for compacting waste containing thermoplastic materials
DE4340188A1 (en) * 1993-11-25 1995-06-01 Helmut Hiendl Concrete polymer prodn. from thermoplastic
DE4433961A1 (en) * 1994-09-23 1996-03-28 Phoenix Ag Polyethylene and milled rubber blends, esp. recycled material, for prodn. of moulded articles and sheet materials
WO1996017807A1 (en) * 1994-11-28 1996-06-13 Vesa Keskisarja Method for producing filling compound from warm filling material such as waste and recoverable plastics

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2001269376B2 (en) * 2000-06-16 2006-05-18 Gibson, Fabin W. Timing belt autotensioner with an anti-tooth skip mechanism
WO2002016098A1 (en) * 2000-08-25 2002-02-28 Pasell S.R.L. Process for the production of manufactures and manufactures obtained with such process
EP1354681A1 (en) * 2002-04-15 2003-10-22 Bobo Holding B.V. Moulded product comprising a thermoplastic component and a particulate filler material and method for producing the same
ES2212734A1 (en) * 2002-12-20 2004-07-16 Julio Beascoechea Bernaola High density counterweights production system includes e.g. polypropylene binder and a mineral composition
ES2333083A1 (en) * 2008-01-16 2010-02-16 Jose Mauri Chacon Plastic compacted by means of polymerization by addition. (Machine-translation by Google Translate, not legally binding)
WO2019049171A1 (en) * 2017-09-06 2019-03-14 Hindura Infrastructure Pvt. Ltd. A process and a system for manufacturing of tiles/blocks from waste plastics

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AU3827500A (en) 2000-11-14

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