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GB1582696A - Method of producing reinforced plastic panels - Google Patents

Method of producing reinforced plastic panels Download PDF

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Publication number
GB1582696A
GB1582696A GB30373/77A GB3037377A GB1582696A GB 1582696 A GB1582696 A GB 1582696A GB 30373/77 A GB30373/77 A GB 30373/77A GB 3037377 A GB3037377 A GB 3037377A GB 1582696 A GB1582696 A GB 1582696A
Authority
GB
United Kingdom
Prior art keywords
sheet
plastics
extruded
reinforcing
fibres
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
Application number
GB30373/77A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ford Motor Co Ltd
Ford Motor Co
Original Assignee
Ford Motor Co Ltd
Ford Motor Co
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 Ford Motor Co Ltd, Ford Motor Co filed Critical Ford Motor Co Ltd
Priority to GB30373/77A priority Critical patent/GB1582696A/en
Priority to DE2826729A priority patent/DE2826729C2/en
Publication of GB1582696A publication Critical patent/GB1582696A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/20—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length
    • B29C44/32—Incorporating or moulding on preformed parts, e.g. linings, inserts or reinforcements
    • B29C44/321—Incorporating or moulding on preformed parts, e.g. linings, inserts or reinforcements the preformed part being a lining, e.g. a film or a support lining
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/36—Feeding the material to be shaped
    • B29C44/46—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length
    • B29C44/50—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying
    • B29C44/505—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying extruding the compound through a flat die
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/245—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it being a foam layer
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
    • E04C2/10—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like; of plastics; of foamed products
    • E04C2/20—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like; of plastics; of foamed products of plastics
    • E04C2/205—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like; of plastics; of foamed products of plastics of foamed plastics, or of plastics and foamed plastics, optionally reinforced
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/718—Weight, e.g. weight per square meter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2607/00—Walls, panels

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Laminated Bodies (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Description

(54) METHOD OF PRODUCING REINFORCED PLASTIC PANELS (71) We, FORD MOTOR COMPANY LIMITED, of Eagle Way, Brentwood, Essex CM13 3BW, a British Company, do hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement : This invention relates to a method of producing plastic panels.
Lightweight plastics panels are known which consist of a rigid foamed plastics core having bonded to either side thereof a fibrous reinforcement and an external solid plastics material. Such panels have hitherto been made by bonding the outer layers to the previously produced core by means of adhesives.
An object of the present invention is to provide a method of producing lightweight plastics panels which is simpler and more economical than those hitherto used.
The invention accordingly provides a method of producing a lightweight plastics panel, comprising extruding a foamed plastics sheet, feeding a layer of fibrous re inforcing material onto each face of said sheet as it is extruded, feeding an outer layer of solid plastics material onto at least one face of said sheet, over the respective reinforcing material layer, as the sheet is extruded, and passing the assembly thus formed between at least one pair of cooled rolls to press the assembly together to bond the layers to the sheet.
Embodiments of the invention will now be described, by way of example, with references to the accompanying drawings, in which: Figure 1 is a diagrammatic side view illustrating one embodiment of the invention; Figure 2 is a similar view of a second embodiment; and Figure 3 illustrates the subsequent use of a panel formed by the method of the invention.
Referring to Figure 1, a foamed plastics sheet 10 is extruded by a conventional extruder 12 and slit die 14. The sheet 10 may be foamed by decomposition of a chemical blowing agent or by gas injection, both of which are well known in the art.
The sheet 10 is passed while still in softened form between a pair of cooled rolls 16, together with a fibrous reinforcing mat 18 and an outer film 20 of solid, substantially unfilled plastics material on either side of the sheet 10. The rolls 16 are spaced such that sufficient force is applied to the mats 18 and films 20 to cause the molten foam to penetrate the fibrous mats 18 and adhere to the films 20. The resulting assembly is then cooled by the rolls sufficiently to be stable, and cut to convenient lengths by a guillotine (not shown) to form panels.
The panels have a foamed core of low weight which spaces the reinforcement. By placing the reinforcement near the outer surfaces, a high stiffness with low weight is achieved. The surface film gives an excellent finish which may be left self-coloured or painted.
Each mat 18 may be produced by weaving, knitting, felting or needling, or may comprise fibres bound by a thermoplastic binding medium. The fibres of the mat are suitably glass, carbon, mineral or metallic fibres.
Many of the plastics materials which may be used for the foam are of low viscosity at the extrusion temperature and will not provide a self-supporting sheet between the extruder and the rolls in a horizontal plane. For this reason, the extruder 12 in Figure 1 is oriented vertically and positioned above the rolls 16. In the embodiment of Figure 2, a horizontal extruder 12a is used, but the sheet 10 is again fed vertically to the rolls 16 by diverting the stream through a vertical die 14a. Also in Figure 2, additional cooled rolls 16a are shown which may be provided to obtain the required cooling of the sandwich assembly.
In the embodiment of Figure 2, a single web 22 is applied to each face of the sheet 10. Each web comprises a fibrous reinforcing layer and a solid plastics outer layer.
Such a web may be formed by prelaminating a fibrous mat as used above and a plastics film, or may comprise a fibre-filled sheet with a substantially unfilled face produced by calendering or extrusion, or may comprise a fibre filled extruded or calendered sheet which has been laminated with an unfilled sheet.
In another form of the invention, the solid plastics film may be omitted from one side, particularly where that side is hidden in eventual use. The structural properties of the product remain substantially the same. It will be appreciated that this may be achieved by a modification of the above described processes, with the outer layer on one side omitted.
The foamed sheet may be of any plastics material which meets the temperature requirement of the finished panel. Thermoplastic materials such as polyamides, polypropylene, polyesters, polycarbonates, polystyrenes, and polyethylene oxides are preferred. Reinforcing fibres may be included in the foam to increase resistance to compression or temperature if desired; these may be glass, carbon, mineral or metallic fibres.
The outer layer(s) may consist of any plastics material to which the molten foamed sheet will adhere. This includes thermoplastic materials such as those given above for the foamed sheet and acrylic, polyurethane and alkyd materials.
The panels produced by the above process may subsequently be shaped by reheating to above the softening point of the plastics materials and forming in a cold matched metal tool, suitably at a pressure exceeding 10 kg/cm2. The tool parts are shaped to collapse the foam fully or partially in some areas, such as the areas 30, 31 respectively in Figure 3, while leaving other areas such as 32 expanded to farm rib structures. In such forming, the reinforcing mats should be capable of 2 or 3 dimensional distortion (for single or double curvature) at the forming temperatures.
Panels produced in accordance with the invention are suitable for use in vehicles, for example as deck lids, hood tops, doors, load bearing floor panels, seat shells and body panels.
WHAT WE CLAIM IS:- 1. A method of producing a lightweight plastics panel, comprising extruding a foamed plastics sheet, feeding a layer of fibrous reinforcing material onto each face of said sheet as it is extruded, feeding an outer layer of solid plastics material into at least one face of said sheet, over the respective reinforcing material layer, as the sheet is extruded, and passing the assembly thus formed between at least one pair of cooled rolls to press the assembly together to bond the layers to the sheet.
2. A method according to Claim 1, in which the sheet is extruded vertically downwards.
3. A method according to Claim 1 or Claim 2, in which an outer layer of solid plastics material is fed onto each face of said sheet, over the reinforcing material layer, as the sheet is extruded.
4. A method according to any preceding Claim, in which each reinforcing material layer comprises a mat of fibres bound with a thermoplastic binding medium.
5. A method according to any of Claims 1 to 3, in which each reinforcing material layer comprises a mat of fibres formed by weaving, knitting, felting or needling.
6. A method according to any of Claims 1 to 3, in which the, or each, outer layer and its corresponding reinforcing material layer, is fed as a unitary web to each side of the extruded sheet.
7. A method according to Claim 6, in which the, or each, said unitary web comprises a fibre-filled sheet with a substantially unfilled face produced by calendering or extrusion.
8. A method according to Claim 6, in which the, or each, said unitary web comprises a pre-laminated plastics film and fibrous mat.
9. A method according to Claim 6, in which the, or each, said unitary web comprises a fibre-filled plastics sheet formed by a calendering or extrusion process and prelaminated with an unfilled plastics sheet.
10. A method according to any preceding claim, in which the foamed plastics sheet is of a material selected from polyamides, polypropylene, polyesters, polycarbonates, polystyrenes, and polyphenylene oxides.
11. A method according to any preceding claim, in which the, or each, said outer layers is of a material selected from polyamides, polypropylene, polyesters, polycarbonates, polystyrenes, polyphenylene
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (15)

**WARNING** start of CLMS field may overlap end of DESC **. the stream through a vertical die 14a. Also in Figure 2, additional cooled rolls 16a are shown which may be provided to obtain the required cooling of the sandwich assembly. In the embodiment of Figure 2, a single web 22 is applied to each face of the sheet 10. Each web comprises a fibrous reinforcing layer and a solid plastics outer layer. Such a web may be formed by prelaminating a fibrous mat as used above and a plastics film, or may comprise a fibre-filled sheet with a substantially unfilled face produced by calendering or extrusion, or may comprise a fibre filled extruded or calendered sheet which has been laminated with an unfilled sheet. In another form of the invention, the solid plastics film may be omitted from one side, particularly where that side is hidden in eventual use. The structural properties of the product remain substantially the same. It will be appreciated that this may be achieved by a modification of the above described processes, with the outer layer on one side omitted. The foamed sheet may be of any plastics material which meets the temperature requirement of the finished panel. Thermoplastic materials such as polyamides, polypropylene, polyesters, polycarbonates, polystyrenes, and polyethylene oxides are preferred. Reinforcing fibres may be included in the foam to increase resistance to compression or temperature if desired; these may be glass, carbon, mineral or metallic fibres. The outer layer(s) may consist of any plastics material to which the molten foamed sheet will adhere. This includes thermoplastic materials such as those given above for the foamed sheet and acrylic, polyurethane and alkyd materials. The panels produced by the above process may subsequently be shaped by reheating to above the softening point of the plastics materials and forming in a cold matched metal tool, suitably at a pressure exceeding 10 kg/cm2. The tool parts are shaped to collapse the foam fully or partially in some areas, such as the areas 30, 31 respectively in Figure 3, while leaving other areas such as 32 expanded to farm rib structures. In such forming, the reinforcing mats should be capable of 2 or 3 dimensional distortion (for single or double curvature) at the forming temperatures. Panels produced in accordance with the invention are suitable for use in vehicles, for example as deck lids, hood tops, doors, load bearing floor panels, seat shells and body panels. WHAT WE CLAIM IS:-
1. A method of producing a lightweight plastics panel, comprising extruding a foamed plastics sheet, feeding a layer of fibrous reinforcing material onto each face of said sheet as it is extruded, feeding an outer layer of solid plastics material into at least one face of said sheet, over the respective reinforcing material layer, as the sheet is extruded, and passing the assembly thus formed between at least one pair of cooled rolls to press the assembly together to bond the layers to the sheet.
2. A method according to Claim 1, in which the sheet is extruded vertically downwards.
3. A method according to Claim 1 or Claim 2, in which an outer layer of solid plastics material is fed onto each face of said sheet, over the reinforcing material layer, as the sheet is extruded.
4. A method according to any preceding Claim, in which each reinforcing material layer comprises a mat of fibres bound with a thermoplastic binding medium.
5. A method according to any of Claims 1 to 3, in which each reinforcing material layer comprises a mat of fibres formed by weaving, knitting, felting or needling.
6. A method according to any of Claims 1 to 3, in which the, or each, outer layer and its corresponding reinforcing material layer, is fed as a unitary web to each side of the extruded sheet.
7. A method according to Claim 6, in which the, or each, said unitary web comprises a fibre-filled sheet with a substantially unfilled face produced by calendering or extrusion.
8. A method according to Claim 6, in which the, or each, said unitary web comprises a pre-laminated plastics film and fibrous mat.
9. A method according to Claim 6, in which the, or each, said unitary web comprises a fibre-filled plastics sheet formed by a calendering or extrusion process and prelaminated with an unfilled plastics sheet.
10. A method according to any preceding claim, in which the foamed plastics sheet is of a material selected from polyamides, polypropylene, polyesters, polycarbonates, polystyrenes, and polyphenylene oxides.
11. A method according to any preceding claim, in which the, or each, said outer layers is of a material selected from polyamides, polypropylene, polyesters, polycarbonates, polystyrenes, polyphenylene
oxides, acrylic resins, polyurethanes and alkyd resins.
12. A method according to any preceding claim, in which the reinforcing material comprises glass, carbon, mineral or metallic fibres.
13. A method acording to any preceding claim, in which the foamed sheet contains glass, carbon, mineral or metallic reinforcing fibres.
14. A method of producing a lightweight plastics panel, substantially as hereinbefore described with reference to the accompanying drawings.
15. A plastics panel produced by the method of any preceding 'claims.
GB30373/77A 1977-07-20 1977-07-20 Method of producing reinforced plastic panels Expired GB1582696A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB30373/77A GB1582696A (en) 1977-07-20 1977-07-20 Method of producing reinforced plastic panels
DE2826729A DE2826729C2 (en) 1977-07-20 1978-06-19 Process for the production of multilayer plate-shaped components

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB30373/77A GB1582696A (en) 1977-07-20 1977-07-20 Method of producing reinforced plastic panels

Publications (1)

Publication Number Publication Date
GB1582696A true GB1582696A (en) 1981-01-14

Family

ID=10306650

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30373/77A Expired GB1582696A (en) 1977-07-20 1977-07-20 Method of producing reinforced plastic panels

Country Status (2)

Country Link
DE (1) DE2826729C2 (en)
GB (1) GB1582696A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5698304A (en) * 1994-06-06 1997-12-16 Owens-Corning Fiberglas Technology, Inc. Polymer coated glass fiber mat
US5910350A (en) * 1994-09-06 1999-06-08 Bio-Tec Biologische Naturverpackugen Gmbh Starch foam panel
EP0940249A2 (en) * 1998-03-06 1999-09-08 Celotex Corporation Foam insulation board faced with a tough polymeric film or composite thereof
WO2000017036A1 (en) * 1998-09-21 2000-03-30 Sonoform Ab Floor panel for a vehicle floor
EP1319554A1 (en) * 2001-12-12 2003-06-18 Alcan Technology & Management AG Roof stiffening for motor vehicle
DE102008052967B4 (en) 2008-10-23 2023-11-30 Volkswagen Ag Multi-layer surface component and method for producing the same

Families Citing this family (9)

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FR2574451B2 (en) * 1984-05-28 1988-06-10 Gautier Jean Daniel BUILDING PANEL WITH FACTORY LONGITUDINAL AND CROSS-EDGE EDGES FOR QUICK ASSEMBLY
FR2585390A1 (en) * 1985-07-29 1987-01-30 Martel Daniel Construction of isothermal and metal panels
DE3831323A1 (en) * 1988-07-07 1990-03-29 Gefinex Gmbh Process for reinforcing polystyrene foam
DE4121866A1 (en) * 1991-07-02 1993-01-14 Peter Pelz MOLDED PART WITH A PLASTIC CORE AND A FIBERGLASS COATING AND METHOD FOR PRODUCING SUCH A MOLDED PART
US5466317A (en) * 1993-04-23 1995-11-14 Aluminum Company Of America Laminated building panel and method for its production
DE19624132A1 (en) * 1996-06-17 1997-12-18 Missel Gmbh & Co E Process for the production of a tubular insulation and / or protective material
CN103072358B (en) * 2013-01-28 2015-07-01 任四平 Manufacturing method and equipment for micro-foaming sandwich layer steel-plastic composite plate for structure
AT516084A1 (en) * 2014-07-16 2016-02-15 Intier Automotive Eybl Gmbh Ebergassing & Co Ohg Process for producing a laminar composite material and laminar composite material for trim parts of motor vehicles
DE102021204631A1 (en) 2021-05-06 2022-11-10 Tesa Se Process for forming a syntactically foamed polymer sheet

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CH357551A (en) * 1954-08-05 1961-10-15 Bayer Ag Rigid foam composite body
DE1154264B (en) * 1956-11-20 1963-09-12 Reifenhaeuser Kg Device for the continuous extrusion of molded bodies with a foam core and a shell made of thermoplastic material
US3246058A (en) * 1961-02-28 1966-04-12 Allied Chem Method for producing reinforced foam laminate structures
US3647588A (en) * 1965-12-17 1972-03-07 Woodall Industries Inc Method for making foam panel
GB1345150A (en) * 1970-10-23 1974-01-30 Monsanto Chemicals Footwear
ZA718171B (en) * 1971-01-12 1972-09-27 Lavorazione Mat Plast Synthetic resin laminate and its manufacturing process
GB1366703A (en) * 1971-06-04 1974-09-11 Monsanto Ltd Foamed resin laminates
BE793041A (en) * 1971-12-23 1973-06-20 Bayer Ag REINFORCED HARD POLYURETHANE RESINS SUITABLE FOR HEAT REVERSIBLE FORMING
DE2233307C3 (en) * 1972-07-06 1975-01-23 Georg Fritzmeier Kg, 8011 Grosshelfendorf Edge zone reinforcement made of fiber material on skis
GB1470066A (en) * 1974-10-08 1977-04-14 Ici Ltd Laminates

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5698304A (en) * 1994-06-06 1997-12-16 Owens-Corning Fiberglas Technology, Inc. Polymer coated glass fiber mat
US5910350A (en) * 1994-09-06 1999-06-08 Bio-Tec Biologische Naturverpackugen Gmbh Starch foam panel
EP0940249A2 (en) * 1998-03-06 1999-09-08 Celotex Corporation Foam insulation board faced with a tough polymeric film or composite thereof
EP0940249A3 (en) * 1998-03-06 2003-05-14 Dow Global Technologies Inc. Foam insulation board faced with a tough polymeric film or composite thereof
WO2000017036A1 (en) * 1998-09-21 2000-03-30 Sonoform Ab Floor panel for a vehicle floor
EP1319554A1 (en) * 2001-12-12 2003-06-18 Alcan Technology & Management AG Roof stiffening for motor vehicle
DE102008052967B4 (en) 2008-10-23 2023-11-30 Volkswagen Ag Multi-layer surface component and method for producing the same

Also Published As

Publication number Publication date
DE2826729A1 (en) 1979-02-08
DE2826729C2 (en) 1985-03-21

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940720