CA1166138A - Process for separating the outer sheets of a metal/plastic/metal composite panel from the plastic core - Google Patents
Process for separating the outer sheets of a metal/plastic/metal composite panel from the plastic coreInfo
- Publication number
- CA1166138A CA1166138A CA000366993A CA366993A CA1166138A CA 1166138 A CA1166138 A CA 1166138A CA 000366993 A CA000366993 A CA 000366993A CA 366993 A CA366993 A CA 366993A CA 1166138 A CA1166138 A CA 1166138A
- Authority
- CA
- Canada
- Prior art keywords
- roll gap
- process according
- composite panel
- plastic
- rolls
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
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
- 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
-
- 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
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/06—PVC, i.e. polyvinylchloride
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
-
- 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
- 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
- B29K2705/08—Transition metals
- B29K2705/12—Iron
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
A B S T R A C T
In order to recycle the scrap arising from the production and cutting to size of metal/plastic/metal composite panels, the metal must be separated from the plastic.
By the process according to the invention the scrap pieces of composite panel are fed through the gap between two parallel, heated rolls, at least one of the rolls being pow-er driven and the width of the roll gap being smaller than the thickness of the composite panel.
On passing through the roll gap the cover sheets on the composite panel separate from the plastic core under the action of pressure, shear forces and heat.
In order to recycle the scrap arising from the production and cutting to size of metal/plastic/metal composite panels, the metal must be separated from the plastic.
By the process according to the invention the scrap pieces of composite panel are fed through the gap between two parallel, heated rolls, at least one of the rolls being pow-er driven and the width of the roll gap being smaller than the thickness of the composite panel.
On passing through the roll gap the cover sheets on the composite panel separate from the plastic core under the action of pressure, shear forces and heat.
Description
' 11~613~
¦IProcess for sepaxating the outer sheets of a metal/'plastic/
metal composite panel from the plastic core The invention relates to a process for separating the outer I¦ sheets of a metal/plastic/metal composite panel from the I plastic core.
Composite panels with a plastic core and metal cover sheets are used today in a wide range of applications. The advant-ages they offer are related e.g. to their light weight and ease of working. Widely used are in particular composite panels which have a polyethylene core and aluminum outer sheets. These are used for example as roofing or facade elements, and to cover walls and ceilings.
Such composite materials are nowadays manufactured for the most part as strip on continuous production lines before they are cut to standard sizes with travelling shears. In the course of production,and on cutting the material to the required dimensions,pieces of composite are produced which can not be used further. In order to recover the materials from these scrap pieces it is necessary to separ-ate the outer sheets from the plastic core. Cutting up andgrinding the scrap down to small particles followed by air or sink/float separation, or by reacting with chemical agents have, up to now, produced no economic solution to this problem.
11~6;13t~
¦¦It is therefore an object of the invention to develop a process by means of which the outer sheets of a metal/plastic /metal composite panel can be separated, simply and economic-ally from the plastic core.
This object is achieved by way of the invention in that the ¦composite panel is passed through the gap of a pair of parallel, heated rolls, whereby at least one of the rolls is power driven and the width of the roll gap is smaller than the thickness of the composite panel.
¦ As a result of the different mechanical forming behaviour of the metal and the plastic, shear forces are produced between the outer sheets and the plastic core due to the pressure exerted on the panel in the roll gap. The heat which l is simultaneously transmitted from the rolls to the panel causes local heating of the plastic in the immediate vicin-ity of the cover sheets. In addition, the cover sheets are subjected to a slight degree of bending by the rolls.
Under the ccmbined action of these three factors viz., pressure, heat and bending the cover sheets are separated from the 20 ¦ plastic core as the panel passes through the roll gap.
In a preferred version of the process both rolls are power driven. The turning speed of both rolls is generally the same. They can however be made different to increase the shear force in the interface between the cover sheets and ~5 e plastic core.
I1~613~
The applied pressure, which is arrived at by setting the roll gap, the temperature of the rolls,and the turning speed,at which the panel is fed through the roll gap,can be varied within wide limits.
I
¦,It has been found advantageous to employ the following conditions:
Width of roll gap : 30 to 80% of the panel thickness Roll temPerature : 50 to 1~0 C
Feed rate of the panel : 1 to 20 m/min As the softening of the plastic core depends on the time the panel is in contact with the rolls, it is clear that a higher feed rate requires a higher roll temperature.
Extensive plant trials with commercially available composite panels,with 2-8 mm thick polyethylene core and 0.5 mm thick aluminum cover sheets,have shown that operating with a roll gap width, roll temperature and feed rate within the above mentioned preferred limits allows the cover sheets to be removed from the plastic core without problem.
Further trials with panels made of 2-8 mm thick polyethylene core and 0.3 mm thick steel cover sheets, and with panels made of 6 mm thick foamed PVC and 0.5 mm thick aluminum cover sheets also gave positive results.
The process according to the invention is explained in great-i er detail in the following with the help of a schematic drawing.
Il A device for carrying out the process according to the in-I vention features two parallel, cylindrical rolls l, l' which Il are separated by a roll gap 2. Both rolls l, l', which are ¦I preferably made of steel and have, if desired, roughened surfaces, are heated by a flame impinging directly on their j working surface from gas burners 3, 3'. The rolls l, l' are I power driven at equal rates in opposite directions.
After setting the desired roll gap width - by roll gap width is to be understood the minimum distance between the pair of rolls - and the temperature and speed of rotation of the rolls, the composite panel A is fed between the rotating rolls l, l' where it is engaged by them and pulled through the gap 2. As a result of the combined action of pressure, shear forces and heat, the cover sheets 4, 4' are separated from the plastic core 5 as the panel A passes through the roll gap 2.
¦IProcess for sepaxating the outer sheets of a metal/'plastic/
metal composite panel from the plastic core The invention relates to a process for separating the outer I¦ sheets of a metal/plastic/metal composite panel from the I plastic core.
Composite panels with a plastic core and metal cover sheets are used today in a wide range of applications. The advant-ages they offer are related e.g. to their light weight and ease of working. Widely used are in particular composite panels which have a polyethylene core and aluminum outer sheets. These are used for example as roofing or facade elements, and to cover walls and ceilings.
Such composite materials are nowadays manufactured for the most part as strip on continuous production lines before they are cut to standard sizes with travelling shears. In the course of production,and on cutting the material to the required dimensions,pieces of composite are produced which can not be used further. In order to recover the materials from these scrap pieces it is necessary to separ-ate the outer sheets from the plastic core. Cutting up andgrinding the scrap down to small particles followed by air or sink/float separation, or by reacting with chemical agents have, up to now, produced no economic solution to this problem.
11~6;13t~
¦¦It is therefore an object of the invention to develop a process by means of which the outer sheets of a metal/plastic /metal composite panel can be separated, simply and economic-ally from the plastic core.
This object is achieved by way of the invention in that the ¦composite panel is passed through the gap of a pair of parallel, heated rolls, whereby at least one of the rolls is power driven and the width of the roll gap is smaller than the thickness of the composite panel.
¦ As a result of the different mechanical forming behaviour of the metal and the plastic, shear forces are produced between the outer sheets and the plastic core due to the pressure exerted on the panel in the roll gap. The heat which l is simultaneously transmitted from the rolls to the panel causes local heating of the plastic in the immediate vicin-ity of the cover sheets. In addition, the cover sheets are subjected to a slight degree of bending by the rolls.
Under the ccmbined action of these three factors viz., pressure, heat and bending the cover sheets are separated from the 20 ¦ plastic core as the panel passes through the roll gap.
In a preferred version of the process both rolls are power driven. The turning speed of both rolls is generally the same. They can however be made different to increase the shear force in the interface between the cover sheets and ~5 e plastic core.
I1~613~
The applied pressure, which is arrived at by setting the roll gap, the temperature of the rolls,and the turning speed,at which the panel is fed through the roll gap,can be varied within wide limits.
I
¦,It has been found advantageous to employ the following conditions:
Width of roll gap : 30 to 80% of the panel thickness Roll temPerature : 50 to 1~0 C
Feed rate of the panel : 1 to 20 m/min As the softening of the plastic core depends on the time the panel is in contact with the rolls, it is clear that a higher feed rate requires a higher roll temperature.
Extensive plant trials with commercially available composite panels,with 2-8 mm thick polyethylene core and 0.5 mm thick aluminum cover sheets,have shown that operating with a roll gap width, roll temperature and feed rate within the above mentioned preferred limits allows the cover sheets to be removed from the plastic core without problem.
Further trials with panels made of 2-8 mm thick polyethylene core and 0.3 mm thick steel cover sheets, and with panels made of 6 mm thick foamed PVC and 0.5 mm thick aluminum cover sheets also gave positive results.
The process according to the invention is explained in great-i er detail in the following with the help of a schematic drawing.
Il A device for carrying out the process according to the in-I vention features two parallel, cylindrical rolls l, l' which Il are separated by a roll gap 2. Both rolls l, l', which are ¦I preferably made of steel and have, if desired, roughened surfaces, are heated by a flame impinging directly on their j working surface from gas burners 3, 3'. The rolls l, l' are I power driven at equal rates in opposite directions.
After setting the desired roll gap width - by roll gap width is to be understood the minimum distance between the pair of rolls - and the temperature and speed of rotation of the rolls, the composite panel A is fed between the rotating rolls l, l' where it is engaged by them and pulled through the gap 2. As a result of the combined action of pressure, shear forces and heat, the cover sheets 4, 4' are separated from the plastic core 5 as the panel A passes through the roll gap 2.
Claims (12)
1. A process for separating the outer sheets on a metal/plastic/metal composite panel from the plastic core, which comprises providing two parallel, heated rolls having a roll gap therebetween, wherein at least one of the rolls is power driven and the width of the roll gap is smaller than the thickness of the composite panel, and feeding said composite panel through the roll gap, and separating the cover sheets from the plastic core as a result of a combination of local heating of the plastic adjacent the cover sheets, pressure and bending the cover sheets.
2. A process according to claim 1, wherein both rolls are driven at the same speed.
3. A process according to claim 1, wherein both rolls are driven at different speeds.
4. A process according to claim 1, wherein the temperature of the rolls is between 50 and 150°C.
5. A process according to claim 2 or 3, wherein the temperature of the rolls is between 50 and 150°C.
6. A process according to claim 1, wherein the width of the roll gap is from 30 to 80% of the thickness of the composite panel.
7. A process according to claim 4, wherein the width of the roll gap is from 30 to 80% of the thickness of the composite panel.
8. A process according to claim 1, 4 or 6, wherein the composite panel is fed through the roll gap at a speed of 1 to 20 meters per minute.
9. A process according to claim 7, wherein the com-posite panel is fed through the roll gap at a speed of 1 to 20 meters per minute.
10. A process according to claim 1, 4 or 6, wherein the outer sheets are separated from the plastic core as the panel passes through the roll gap.
11. A process according to claim 7 or 9, wherein the outer sheets are separated from the plastic core as the panel passes through the roll gap.
12. A process according to claim 1, 2 or 3, wherein the temperature of the rolls is between 50 and 150°C., the width of the roll gap is from 30% to 80% of the thickness of the composite panel, and the composite panel is fed through the roll gap at a speed of 1 to 20 meters per minute.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH1138079 | 1979-12-21 | ||
| CH11380/79-3 | 1979-12-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1166138A true CA1166138A (en) | 1984-04-24 |
Family
ID=4372962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000366993A Expired CA1166138A (en) | 1979-12-21 | 1980-12-17 | Process for separating the outer sheets of a metal/plastic/metal composite panel from the plastic core |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0031797B1 (en) |
| JP (1) | JPS5698134A (en) |
| AT (1) | ATE3142T1 (en) |
| BR (1) | BR8008240A (en) |
| CA (1) | CA1166138A (en) |
| DE (2) | DE3004052A1 (en) |
| YU (1) | YU41225B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5304276A (en) * | 1990-06-26 | 1994-04-19 | G. P. Research Ltd. | Method and apparatus for reclaiming gypsum from waste wallboard |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2157193B (en) * | 1984-04-10 | 1987-08-19 | Nitto Electric Ind Co | Process for peeling protective film off a thin article |
| JPH0761649B2 (en) * | 1988-11-14 | 1995-07-05 | 出光石油化学株式会社 | Scrap recovery method for multi-layer plastic sheet or film |
| US5194109A (en) * | 1988-11-14 | 1993-03-16 | Idemitsu Petrochemical Co., Ltd. | Method for recovering scraps of multi-layer plastic sheet or film |
| DE4212425A1 (en) * | 1992-04-14 | 1993-10-28 | Bayer Ag | Sepn. of joined metal and non-metal components by means of rollers - useful for the recovery of copper@, aluminium@ and silver@ conductors and polymer insulation from electrical cables |
| DE4322298A1 (en) * | 1992-08-04 | 1994-02-10 | Bayer Ag | Process for the separation of plastic-non-metal composite systems |
| JP2829236B2 (en) * | 1994-03-22 | 1998-11-25 | 富士重工業株式会社 | How to recycle painted resin products |
| US5500072A (en) * | 1994-10-17 | 1996-03-19 | Mitsubishi Chemical America, Inc. | Method and apparatus for recycling metal sheet-thermoplastic resin laminate composites |
| WO1996012598A1 (en) * | 1994-10-20 | 1996-05-02 | Teijin Chemicals, Ltd. | Method for resin recovery |
| KR19990068768A (en) * | 1999-06-18 | 1999-09-06 | 허명국 | The equipment and method wire separation abolition tire |
| JP2002031458A (en) | 2000-07-14 | 2002-01-31 | Matsushita Electric Ind Co Ltd | Method for dismantling refrigerator, compressor, and apparatus for dismantling refrigerator |
| JP4467742B2 (en) | 2000-08-30 | 2010-05-26 | パナソニック株式会社 | Home appliance and air conditioner cutting device, and home appliance and air conditioner disassembly method |
| JP2002144344A (en) * | 2000-11-16 | 2002-05-21 | Matsushita Electric Ind Co Ltd | Method for recovering foaming resin and foaming gas and method for disjointing refrigerator |
| JP4518555B2 (en) * | 2004-12-10 | 2010-08-04 | 日本テトラパック株式会社 | Packaging material separation method |
| JP4758329B2 (en) * | 2006-11-30 | 2011-08-24 | ロンシール工業株式会社 | Method and apparatus for separating thermoplastic resin wall covering |
| FR3048897B1 (en) * | 2016-03-21 | 2018-03-02 | Mecanokit | METHOD AND INSTALLATION FOR PROCESSING PANEL OR PLATE |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2347108C3 (en) * | 1973-09-19 | 1980-02-14 | Vereinigte Aluminium-Werke Ag, 5300 Bonn | Process for separating metal and plastic |
| JPS5130878A (en) * | 1974-09-11 | 1976-03-16 | Mitsui Petrochemical Ind | |
| DE2500126A1 (en) * | 1975-01-03 | 1976-07-15 | Josef Ridder | Thermoplastic recovered from metal coated thermoplastic sheet - by squeezing into perforated heated hollow roll by counter roll |
| JPS6010887B2 (en) * | 1976-02-02 | 1985-03-20 | 三井化学株式会社 | Peeling method for metal/synthetic resin composite board |
-
1980
- 1980-02-05 DE DE19803004052 patent/DE3004052A1/en not_active Ceased
- 1980-12-16 BR BR8008240A patent/BR8008240A/en not_active IP Right Cessation
- 1980-12-17 AT AT80810402T patent/ATE3142T1/en not_active IP Right Cessation
- 1980-12-17 DE DE8080810402T patent/DE3062905D1/en not_active Expired
- 1980-12-17 EP EP19800810402 patent/EP0031797B1/en not_active Expired
- 1980-12-17 CA CA000366993A patent/CA1166138A/en not_active Expired
- 1980-12-18 YU YU320580A patent/YU41225B/en unknown
- 1980-12-19 JP JP18028180A patent/JPS5698134A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5304276A (en) * | 1990-06-26 | 1994-04-19 | G. P. Research Ltd. | Method and apparatus for reclaiming gypsum from waste wallboard |
Also Published As
| Publication number | Publication date |
|---|---|
| YU41225B (en) | 1986-12-31 |
| DE3062905D1 (en) | 1983-06-01 |
| ATE3142T1 (en) | 1983-05-15 |
| EP0031797B1 (en) | 1983-04-27 |
| EP0031797A1 (en) | 1981-07-08 |
| JPS5698134A (en) | 1981-08-07 |
| BR8008240A (en) | 1981-07-07 |
| JPH0159084B2 (en) | 1989-12-14 |
| YU320580A (en) | 1983-06-30 |
| DE3004052A1 (en) | 1981-09-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |