WO2013171769A1 - Process for producing thermoplastic material deriving from the recovery of liquid containers made of poly-coupled material - Google Patents

Process for producing thermoplastic material deriving from the recovery of liquid containers made of poly-coupled material Download PDF

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Publication number
WO2013171769A1
WO2013171769A1 PCT/IT2012/000107 IT2012000107W WO2013171769A1 WO 2013171769 A1 WO2013171769 A1 WO 2013171769A1 IT 2012000107 W IT2012000107 W IT 2012000107W WO 2013171769 A1 WO2013171769 A1 WO 2013171769A1
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WO
WIPO (PCT)
Prior art keywords
process according
water
die plate
cooling
cutting
Prior art date
Application number
PCT/IT2012/000107
Other languages
French (fr)
Inventor
Gianfranco Ferrero
Aldo Piero GIACOLETTI
Bernardino GIORDANINO
Fabio GINO
Original Assignee
Gianfranco Ferrero
Aldo Piero GIACOLETTI
Bernardino GIORDANINO
Fabio GINO
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 Gianfranco Ferrero, Aldo Piero GIACOLETTI, Bernardino GIORDANINO, Fabio GINO filed Critical Gianfranco Ferrero
Priority to PCT/IT2012/000107 priority Critical patent/WO2013171769A1/en
Publication of WO2013171769A1 publication Critical patent/WO2013171769A1/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
    • 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
    • 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
    • B29B2017/0286—Cleaning means used for separation
    • B29B2017/0289—Washing the materials in liquids
    • 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
    • B29B9/02—Making granules by dividing preformed material
    • B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
    • B29B9/065—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion under-water, e.g. underwater pelletizers
    • 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
    • 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
    • B29K2001/00—Use of cellulose, modified cellulose or cellulose derivatives, e.g. viscose, 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • 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
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
    • B29K2705/02—Aluminium
    • 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
    • B29L2009/00—Layered products
    • B29L2009/003—Layered products comprising a metal layer
    • 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
    • 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
    • B29L2031/7162—Boxes, cartons, cases
    • B29L2031/7166—Cartons of the fruit juice or milk type, i.e. containers of polygonal cross sections formed by folding blanks into a tubular body with end-closing or contents-supporting elements, e.g. gable type containers
    • 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 refers to a process for producing thermoplastic material deriving from the recovery of liquid containers made of poly-coupled material.
  • Cutting systems are known in the art, used in compounding thermoplastic materials of the "spaghetti” type or of the “liquid ring” type.
  • Object of the present invention is providing a process for producing thermoplastic material deriving from the recovery of containers for liquids made of poly-coupled materials, namely containers made by coupling cellulose, polyethylene, aluminium, etc., whose innovative feature is its cutting system defined as “submersed cutting” system.
  • the "submersed cutting” system is efficient in compounding these thermoplastic materials, since it allows having a die plate whose holes are of such a size as to pass all aluminium contained inside the poly-coupled material.
  • the thermoplastic material is instantaneously cooled, getting in contact with water in which the die plate itself is immersed. Cooling generates a pellet that is afterwards cooled and dried on a vibrating bed.
  • a die plate in order to obtain a dimensionally-acceptable pellet, a die plate should be available with such a hole size as not to make all aluminium present in the material pass therethrough; this because the die plate is not directly in contact with water, and thereby the material cut by the knives runs on a path in which it expands before getting in contact with the liquid ring .
  • the production process of the present invention refers to the production of a thermoplastic material deriving from the recovery process of industrial and post-consumption wastes of liquid containers made of poly-coupled materials made by coupling cellulose, polyethylene, aluminium, etc.
  • step 1 Washing
  • step 2 Increasing the specific weight step 3: Extruding step 4 : Filtering step 5: Cooling and cutting step 6: Sieving
  • step 1 of washing it is used to reduce to a minimum the percentage of cellulose inside the material and remove possible other contaminants.
  • the poly-coupled material is inserted into tanks full of water, that contain fixtures suitable to always keep the material moving and that, through beating and rubbing, allow the cellulose inside the' poly-coupled material to be dissolved into water.
  • the poly-coupled material that is output from this first step must be immersed into following tanks that have the same principle.
  • the material output from step 1 has a very low specific weight and a degree of humidity that is not acceptable in the extruding step. This step therefore is used to increase the specific weight of the material and decrease the degree of humidity inside, through two methods:
  • the material is inserted into a densifying device that heats the material through friction generated by moving mechanical systems and agglomerates it producing small compact fragments. These fragments are immediately wetted in order to block their shape. Water, in contact with the material, due to the high heat, immediately evaporates.
  • the material is inserted into an agglomerating device that, through heat produced by resistances and friction generated by moving mechanical systems, compacts the material that therefore goes out as an agglomerate with irregular shapes.
  • These agglomerates are cooled and afterwards ground with a normal knife-type grinding machine for plastic materials.
  • this step is used for extruding the material and make it an homogeneous compound of plastic material that can be used in all transforming technologies for plastic materials.
  • step 2 The material produced by step 2 is inserted into an extruder.
  • the extruder is composed of a worm screw inside a cylinder, which is heated through resistances with suitable instruments adapted to detect , the temperature and to thermo-regulate it.
  • the extruder can be of different types:
  • Co-rotating double-screw type two coupled worm screws which both rotate along the same direction
  • Counter-rotating double-screw type two coupled worm screws which rotate along opposite directions
  • These extruders can be equipped with batching systems that are used for inserting possible additives inside the material, modifying its characteristics.
  • the extruder needs a degassing funnel that, through a vacuum pump, extracts humidity from inside the material.
  • step 4 of filtering at the end of the extruder, there is an apparatus called filter-changing device, that is used for holding possible impurities and determining the width of the aluminium particles present in the extruded product meant as material in pellets.
  • a filter made of metallic meshes is inserted, that, according to the size of its holes, let those particles that are below a certain diameter pass therethrough.
  • the optimum range is from 0.5 mm to 5 mm.
  • the principle of the filter- changing device is holding the particles depending on its filtering degree.
  • step 5 of . cooling and cutting at the end of the filtering step, the material goes out through a die plate whose purpose is giving shape to the material being output. The material is afterwards cooled and cut by using different systems :
  • Submersed cutting in this system the material going out of the die plate is cut by knives in contact with the die plate; both die plate and knives are immersed into a pressurised water flow whose function is immediately cooling the cut material and transporting it. Separation of water from the material can occur through a centrifuge or through vibrating sieves, which remove water and dry the material.
  • Liquid, ring cutting in this system, the materi-al going out of the die plate is cut by knives in contact with the die plate, which are not directly in contact with water.
  • the cut material is launched by the centrifugal force of the knives inside a water vortex whose function is cooling the cut material and transporting it. Separation of water from the material can occur through a centrifuge or through vibrating sieves which remove wa and dry the material.
  • Spaghetti-type cutting this system the material going out of the die plate as threads passes through a tank full of water that cools the end of the tank, the threads are made pass inside a tunnel that blows air for a further cooling and for sliding away the water particles. Finally, the threads are made pass inside a knife-type cutting system, commonly called “cutting device for plastic materials”.
  • the material is immersed into a sieve whose function is determining certain sizes and discarding possible imperfections.

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

A process is described, for producing a thermoplastic material deriving from the recovery process of industrial and post-consumption wastes of liquid containers obtained by coupling poly- coupled materials, for example cellulose, polyethylene, aluminium; this process comprises the steps of: washing; increasing the specific weight; extruding; filtering; cooling and cutting; and sieving.

Description

PROCESS FOR PRODUCING THERMOPLASTIC MATERIAL
DERIVING FROM THE RECOVERY OF LIQUID CONTAINERS MADE OF POLY-COUPLED MATERIAL
The present invention refers to a process for producing thermoplastic material deriving from the recovery of liquid containers made of poly-coupled material.
Cutting systems are known in the art, used in compounding thermoplastic materials of the "spaghetti" type or of the "liquid ring" type.
Object of the present invention is providing a process for producing thermoplastic material deriving from the recovery of containers for liquids made of poly-coupled materials, namely containers made by coupling cellulose, polyethylene, aluminium, etc., whose innovative feature is its cutting system defined as "submersed cutting" system. The "submersed cutting" system is efficient in compounding these thermoplastic materials, since it allows having a die plate whose holes are of such a size as to pass all aluminium contained inside the poly-coupled material. When going out of the die plate, the thermoplastic material is instantaneously cooled, getting in contact with water in which the die plate itself is immersed. Cooling generates a pellet that is afterwards cooled and dried on a vibrating bed.
This system is better with respect to traditional systems since:
- with the "spaghetti"-type system, the material going out of the die plate tends to be broken:
. therefore, this implies an excessive waste, a scarce productivity and an increase of the responsible personnel, since this system is much more manual than the other ones;
- with the "liquid ring"-type system, in order to obtain a dimensionally-acceptable pellet, a die plate should be available with such a hole size as not to make all aluminium present in the material pass therethrough; this because the die plate is not directly in contact with water, and thereby the material cut by the knives runs on a path in which it expands before getting in contact with the liquid ring .
The above and other objects and advantages of the invention, as will appear from the following description^ are obtained with a process as claimed in claim 1. Preferred embodiments and non-trivial variations of the present invention are the subject matter of the dependent claims .
It is intended that all enclosed claims are an integral part of the present description.
The present invention will be better described by some preferred embodiments thereof, provided as a non-limiting example: in fact, it will be immediately obvious that numerous variations and modifications (for example related to shape, sizes., arrangements and parts with equivalent functionality) could be made to what is described, without departing from the scope of the invention as appears from the enclosed claims.
The production process of the present invention refers to the production of a thermoplastic material deriving from the recovery process of industrial and post-consumption wastes of liquid containers made of poly-coupled materials made by coupling cellulose, polyethylene, aluminium, etc.
The production process for making such material comprises six steps: step 1 : Washing
- step 2: Increasing the specific weight step 3: Extruding step 4 : Filtering step 5: Cooling and cutting step 6: Sieving
As regards the step 1 of washing, it is used to reduce to a minimum the percentage of cellulose inside the material and remove possible other contaminants.
The poly-coupled material is inserted into tanks full of water, that contain fixtures suitable to always keep the material moving and that, through beating and rubbing, allow the cellulose inside the' poly-coupled material to be dissolved into water.
In order to descrease the cellulose percentage to a minimum, the poly-coupled material that is output from this first step must be immersed into following tanks that have the same principle.
After the tanks, there are (dynamic and static) centrifuges that are used to further clean the material from remained cellulose residuals and to dry it.
At the end of these passes, a material composed of polymers and aluminium is obtained.
As regards the step 2 of increasing the specific weight, the material output from step 1 has a very low specific weight and a degree of humidity that is not acceptable in the extruding step. This step therefore is used to increase the specific weight of the material and decrease the degree of humidity inside, through two methods:
1} the material is inserted into a densifying device that heats the material through friction generated by moving mechanical systems and agglomerates it producing small compact fragments. These fragments are immediately wetted in order to block their shape. Water, in contact with the material, due to the high heat, immediately evaporates.
2} The material is inserted into an agglomerating device that, through heat produced by resistances and friction generated by moving mechanical systems, compacts the material that therefore goes out as an agglomerate with irregular shapes. These agglomerates are cooled and afterwards ground with a normal knife-type grinding machine for plastic materials.
As regards the step 3 of extruding, this step is used for extruding the material and make it an homogeneous compound of plastic material that can be used in all transforming technologies for plastic materials.
The material produced by step 2 is inserted into an extruder.
The extruder is composed of a worm screw inside a cylinder, which is heated through resistances with suitable instruments adapted to detect , the temperature and to thermo-regulate it.
The extruder can be of different types:
Single-screw type- (a worm screw that rotates inside, the cylinder)
Co-rotating double-screw type (two coupled worm screws which both rotate along the same direction)
Counter-rotating double-screw type (two coupled worm screws which rotate along opposite directions) These extruders can be equipped with batching systems that are used for inserting possible additives inside the material, modifying its characteristics.
Function of all these extruders is crumbling the aluminium particles, amalgamating ■ possible additives and transforming the material from its solid state to its plastic state.
The extruder needs a degassing funnel that, through a vacuum pump, extracts humidity from inside the material.
As regards the step 4 of filtering, at the end of the extruder, there is an apparatus called filter-changing device, that is used for holding possible impurities and determining the width of the aluminium particles present in the extruded product meant as material in pellets. Through this apparatus, a filter made of metallic meshes is inserted, that, according to the size of its holes, let those particles that are below a certain diameter pass therethrough. ' The optimum range is from 0.5 mm to 5 mm. The principle of the filter- changing device is holding the particles depending on its filtering degree. As regards the step 5 of . cooling and cutting, at the end of the filtering step, the material goes out through a die plate whose purpose is giving shape to the material being output. The material is afterwards cooled and cut by using different systems :
1) Submersed cutting: in this system the material going out of the die plate is cut by knives in contact with the die plate; both die plate and knives are immersed into a pressurised water flow whose function is immediately cooling the cut material and transporting it. Separation of water from the material can occur through a centrifuge or through vibrating sieves, which remove water and dry the material.
2) Liquid, ring cutting: in this system, the materi-al going out of the die plate is cut by knives in contact with the die plate, which are not directly in contact with water. The cut material is launched by the centrifugal force of the knives inside a water vortex whose function is cooling the cut material and transporting it. Separation of water from the material can occur through a centrifuge or through vibrating sieves which remove wa and dry the material.
3) Spaghetti-type cutting: this system the material going out of the die plate as threads passes through a tank full of water that cools the end of the tank, the threads are made pass inside a tunnel that blows air for a further cooling and for sliding away the water particles. Finally, the threads are made pass inside a knife-type cutting system, commonly called "cutting device for plastic materials".
Finally, as regards the step 6 of sieving, at the end of the three possible cutting solutions, the material is immersed into a sieve whose function is determining certain sizes and discarding possible imperfections.
Some preferred embodiments of the present invention have been shown and described above: obviously, for the skilled people in the art it will be immediately clear that numerous variations and modifications, functionally equivalent to the previous ones, could be made to such embodiments, and they will fall within the scope of the invention as pointed out by the enclosed claims..

Claims

1. Process for producing a thermoplastic material deriving from the recovery process of industrial and post-consumption wastes of liquid containers obtained by coupling poly-coupled materials, for example cellulose, polyethylene, aluminium, said process comprising the steps of:
washing; increasing the specific weight of the material; extruding; filtering; cooling and cutting; and sieving.
2. Process according to claim 1, wherein the step of washing is used to reduce to a minimum the percentage of cellulose inside the material and remove possible other contaminants, and comprises the sub-steps of:
- inserting the poly-coupled material into tanks full of water, that contain fixtures adapted to keep the material always moving and that, through beating and rubbing, allow the cellulose inside the poly-coupled material to be dissolved into water;
in order to decrease the cellulose percentage to a minimum, immersing the poly-coupled material output from this first step into following tanks that have the same principle;
- further cleaning the material from cellulose residuals through centrifuges of a dynamic or static type; and
- obtaining a material composed of polymers and aluminium.
3. Process according to claim 1, wherein the step of increasing the specific weight of the material is used to increase the specific weight of the material and to decrease the degree of humidity inside the material, and comprises the following sub-steps :
inserting the material into a densifying device that heats the material through friction generated by moving mechanical systems and agglomerates it producing small compact fragments; and - wetting these fragments in order to block their shape, since water, in contact with the material, due to the high heat, immediately evaporates.
4. Process according to claim 1, wherein the step of increasing the specific weight of the material is used to increase the specific weight of the material and to decrease the degree of humidity inside the material, and comprises the following sub-steps:
- inserting the material into an agglomerating device that, through heat produced by resistances and friction generated by moving mechanical systems, compacts the material that then goes out as an agglomerate with irregular shapes; and cooling and following grinding these agglomerates with a grinding device for plastic materials .
5. Process according to claim 1, wherein the step of extruding is used for extruding the material and for making it an homogeneous compound of plastic material that can be used in all transforming technologies for plastic materials, and comprises the step of inserting into an extruder the material produced by the step of increasing the specific weight .
6. Process according to claim 5, wherein the extruder is composed of a worm screw inside a cylinder, which is heated through resistances with suitable instruments adapted to detect a temperature and to thermo-regulate it.
7. Process according to claim 6, wherein the extruder is of the single-screw type, namely it has a worm screw that rotates inside the cylinder
8. Process according to claim 6, wherein the extruder is of the co-rotating double-screw type, namely it is composed of two coupled worm screws which both rotate along the same direction.
9. Process according to claim 6, wherein the extruder is of the counter-rotating double-screw type, namely it is composed of two coupled worm screws which both rotate along opposite directions.
10. Process according to claim 7, 8 or 9, wherein said extruders are equipped with batching systems that are used for inserting possible additives inside the material modifying its characteristics, all said extruders 'having the function of crumbling the aluminium particles, amalgamating the possible additives and transforming the material from its solid state to its plastic state.
11. Process according to claim 10, wherein said extruder is equipped with a degassing funnel that, through a vacuum pump, extracts humidity from inside the material.
12. Process according to claim 1, wherein, in the step of filtering, at the end of the extruder, there is a filter-changing device that is used for keeping possible impurities and determining the width of the aluminium particles present in the extruded product meant as material in pellets, thorugh this device a filter made of metallic meshes being inserted, that, according to its hole sizes, lets the particles under a certain diameter pass therethrough, with an optimum range from 0.5 mm to 5 mm, while the principle of the filter- changing device is holding the particles depending on the filtering degree.
13. Process according to claim 1, wherein, in the step of cooling and cutting, at the end of the step of filtering, the material goes out through a die plate whose purpose is giving a shape to the output material, said material being afterwards cooled and cut through a step of submersed cutting, in which the material that goes out of the die plate is cut by knives in contact with the die plate, the die plate and the knives being both immersed into a pressurised water flow whose function is immediately cooling the cut material and transporting the material, the ' separation of water from the material occurring through a centrifuge or through vibrating sieves which remove water and dry the material .
14. Process according to claim 1, wherein, in the step of cooling and cutting, at the end of the step of filtering, the material goes out through a die plate whose purpose is giving a shape to the output material, said material being afterwards cooled and cut through a step of liquid ring cutting, in which the material that goes out of the die plate is cut by knives in contact with the die plate, which are not directly in contact with water, the cut material being launched by the centrifugal force of the knives inside a water vortex whose function is cooling the cut material and transporting it, the separation of water from the material occurting through a centrifuge or through vibrating sieves which remove water and dry the material.
15. Process according to claim 1, wherein, in the step of cooling and cutting, at the end of the step of filtering, the material goes out through a die plate whose purpose is giving a shape to the output material, said material being afterwards cooled and cut through a step of spaghettirtype cuts, in which the material goes out of the die plate as threads which pass through a tank full of water that cools the threades, at the end of the tank, the threads being made pass inside a tunnel that blows air for a further cooling and for sliding away the water particles, finally the threads being made pass inside a knife-type cutting system.
PCT/IT2012/000107 2012-05-13 2012-05-13 Process for producing thermoplastic material deriving from the recovery of liquid containers made of poly-coupled material WO2013171769A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0493720A2 (en) * 1990-12-29 1992-07-08 PWA INDUSTRIEPAPIER GmbH Method for reprocessing thermoplastic coated packing materials and thermoplastic material for further manufacture
EP0570757A1 (en) * 1992-05-15 1993-11-24 Tetra Laval Holdings & Finance SA Method and apparatus for separating paper fiber and plastics from mixed waste materials and products obtained thereby
US20070120283A1 (en) * 2005-10-18 2007-05-31 Applied Extrusion Technologies, Inc. Polypropylene films employing recycled commercially used polypropylene based films and labels
EP2123418A1 (en) * 2008-05-21 2009-11-25 Eco Quadrinvest S.r.l. Method for recycling composite material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0493720A2 (en) * 1990-12-29 1992-07-08 PWA INDUSTRIEPAPIER GmbH Method for reprocessing thermoplastic coated packing materials and thermoplastic material for further manufacture
EP0570757A1 (en) * 1992-05-15 1993-11-24 Tetra Laval Holdings & Finance SA Method and apparatus for separating paper fiber and plastics from mixed waste materials and products obtained thereby
US20070120283A1 (en) * 2005-10-18 2007-05-31 Applied Extrusion Technologies, Inc. Polypropylene films employing recycled commercially used polypropylene based films and labels
EP2123418A1 (en) * 2008-05-21 2009-11-25 Eco Quadrinvest S.r.l. Method for recycling composite material

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