GB2296680A - Extruded plastics composite - Google Patents
Extruded plastics composite Download PDFInfo
- Publication number
- GB2296680A GB2296680A GB9425616A GB9425616A GB2296680A GB 2296680 A GB2296680 A GB 2296680A GB 9425616 A GB9425616 A GB 9425616A GB 9425616 A GB9425616 A GB 9425616A GB 2296680 A GB2296680 A GB 2296680A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pvc
- plastics composite
- pmma
- foamed
- base structure
- 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.)
- Granted
Links
- 239000002131 composite material Substances 0.000 title claims abstract description 29
- 239000003000 extruded plastic Substances 0.000 title claims abstract description 10
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims abstract description 29
- 239000004926 polymethyl methacrylate Substances 0.000 claims abstract description 29
- 239000002023 wood Substances 0.000 claims abstract description 7
- 239000002344 surface layer Substances 0.000 claims abstract description 5
- 230000000694 effects Effects 0.000 claims abstract description 3
- 239000004800 polyvinyl chloride Substances 0.000 claims description 30
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 28
- 238000001125 extrusion Methods 0.000 claims description 18
- 229920003023 plastic Polymers 0.000 claims description 14
- 239000004033 plastic Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 10
- 239000000049 pigment Substances 0.000 claims description 7
- 239000002699 waste material Substances 0.000 claims description 3
- 238000005187 foaming Methods 0.000 claims 1
- 239000000463 material Substances 0.000 description 5
- 239000010410 layer Substances 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 239000011162 core material Substances 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
Classifications
-
- 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
- B29C44/56—After-treatment of articles, e.g. for altering the shape
- B29C44/569—Shaping and joining components with different densities or hardness
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0013—Extrusion moulding in several steps, i.e. components merging outside the die
- B29C48/0015—Extrusion moulding in several steps, i.e. components merging outside the die producing hollow articles having components brought in contact outside the extrusion die
- B29C48/0016—Extrusion moulding in several steps, i.e. components merging outside the die producing hollow articles having components brought in contact outside the extrusion die using a plurality of extrusion dies
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
- E06B3/04—Wing frames not characterised by the manner of movement
- E06B3/06—Single frames
- E06B3/08—Constructions depending on the use of specified materials
- E06B3/20—Constructions depending on the use of specified materials of plastics
- E06B3/205—Constructions depending on the use of specified materials of plastics moulded or extruded around a core
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
-
- 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
- B29K2033/00—Use of polymers of unsaturated acids or derivatives thereof as moulding material
- B29K2033/04—Polymers of esters
- B29K2033/12—Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
A co-extruded plastics composite comprising a base structure of PVC and a surface layer of foamed PMMA providing a wood effect finish along at least part of the surface of the base structure.
Description
Extruded Plastics Composite
This invention relates to an extruded plastics composite, which term as used herein means an extrusion which throughout its length has a cross-section one part of which is constituted by a first plastics material and another part of which is constituted by a second plastics material.
According to one aspect of the invention there is provided an extruded plastics composite having a uniform crosssection one part of which is constituted by polyvinylchloride (PVC) and another part of which is constituted by foamed polymethylmethacrylate (PMMA).
Most preferably, the PVC constitutes the base structure of an extrusion which has a surface layer of foamed PMMA on at least one part of the base structure. Typically, for example, the extrusion may be of rectangular cross-section with a surface layer of foamed PMMA on one or more faces.
Most preferably, the PMMA, otherwise known as acrylic, has one or more pigments incorporated in order to produce a simulated wood finish over at least part of the PVC base structure. The primary purpose of employing foamed PMMA in the composite extrusion is to produce a wood effect finish.
The PVC employed in the extruded composite may comprise at least in part recycled PVC. This recycled PVC, which may conveniently consist of PVC bottle waste, preferably comprises at least 70 per cent and most preferably at least 90 per cent of material forming the extrusion melt for the base structure.
It is conceivable that the extruded plastics composite could be made by extruding PVC at a first extruding station and using the resultant PVC extrusion as a core material at a second extrusion station at which the PMMA is foam extruded to bond to at least part of the surface of the core, i.e. one or more sides thereof.
Preferably, however, the extruded plastics composite is produced by co-extrusion in an extruder wherein the PVC is extruded into a die at which a melt of foamed PMMA is introduced to coalesce with the PVC extrusion on one or more sides thereof as the composite extrusion passes through a calibrator.
In this preferred method, the PVC may or may not be lightly foamed, according to the intended use of the product.
Dependent on the pigment or pigments used in the foamed
PMMA melt, different wood finishes can be simulated.
The extruded composite is suitable for outdoor as well as indoor use, for example in window and door frames, because it has good resistance to all kinds of weathering, including ultra-violet light from the sun. Thus, although the preferred composite has a simulated wood finish, the plastics composite could be produced with otherwise coloured, foamed PMMA, as the PMMA is highly resistant to colour deterioration.
The invention is further described with reference to the accompanying drawings, in which:
Figure 1 diagrammatically shows the process of production
of the extruded plastics composite; and
Figure 2 is a transverse cross-section through the
extrusion die.
Referring to Figure 1, there is indicated a conventional screw extruder 10 receiving a melt of PVC material to be extruded. The PVC is introduced at a hopper 12 in the form of chips of recycled waste derived from plastics bottles. Any additives required, such as pigments, additional stabilisers and possibly a small amount of foaming agent for some applications of the product, are introduced on line. The extrusion melt at the die comprises at least 90 per cent recycled PVC, although virgin PVC may be used instead, at least in part.
At the die 13, a foamed PMMA (acrylic) melt is introduced from extruder 14, reference 16 denoting the hopper at which the foaming agent is added.
Figure 2 shows the "coat-hanger" channel 18 formation by which a layer 20 of foamed PMMA is applied to one face of a rectangularly cross-sectioned PVC extrusion 22 as it passes through the die 10.
In the downstream part of the die, and in the calibrator 24 which follows, the foamed PMMA layer 18 coalesces or bonds with the PVC to form an integral composite extrusion.
In order to obtain coalescing or bonding between two plastics materials in a coextrusion process, it is necessary, typically, for the two melts to differ in temperature by less than about 20 degrees C.
Normally, a PMMA melt would have a temperature at least 10 to 20 degrees C higher than the PVC in a coextrusion process, making it difficult to produce an integral composite. However, because in the above-described process the PMMA is foamed, the temperature of the PMMA melt is reduced by at least 10 degrees C owing to the lower melt viscosity of the foamed PMMA, thus unexpectedly enabling improved bonding with the PVC to take place.
Pigments may or may not be added to the PVC, but the PMMA has pigments added preferably with the aim of achieving a wood-effect finish.
The extruded plastics composite resulting from the abovedescribed process is useful, for example, in the production of door and window frames in which the PMMA layer will be exposed. The composite material thus has satisfactory fire resistance, and extremely good resistance to weathering, including discolouration.
Claims (11)
1. An extruded plastics composite having a uniform cross-section one part of which is constituted by polyvinylchloride (PVC) and another part of which is constituted by foamed polymethylmethacrylate (PMMA).
2. A plastics composite according to claim 1, wherein the PVC constitutes the base structure of an extrusion which has a surface layer of foamed PMMA on at least one part of the base structure.
3. A plastics composite according to claim 2, wherein the extrusion is of rectangular cross-section with a surface layer of foamed PMMA on one or more faces.
4. A plastics composite according to any of claims 1 to 3, wherein the PMMA has one or more pigments incorporated in order to produce a simulated wood finish over at least part of the PVC base structure.
5. A plastics composite according to any of claims 1 to 4, wherein the PVC employed comprises at least in part recycled PVC.
6. A plastics composite according to claim 5, wherein the recycled PVC is obtained from PVC bottle waste.
7. A plastics composite according to any of claims 1 to 6, made by a co-extrusion process.
8. A method of producing a plastics composite having a wood effect finish along at least part of its surface, according to which foamed and pigmented polymethylmethacrylate (PMMA) is coextruded on to at least part of the surface of a PVC extrusion melt which constitutes a base structure of the composite.
9. A method according to claim 8, according to which the temperature of the co-extruded PMMA is controlled at least in part by the foaming thereof to bond with the PVC base structure.
10. A plastics composite substantially as hereinbefore described.
11. A method of extruding a plastics composite substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9425616A GB2296680B (en) | 1994-12-17 | 1994-12-17 | Method of producing a plastics composite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9425616A GB2296680B (en) | 1994-12-17 | 1994-12-17 | Method of producing a plastics composite |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9425616D0 GB9425616D0 (en) | 1995-02-15 |
| GB2296680A true GB2296680A (en) | 1996-07-10 |
| GB2296680B GB2296680B (en) | 1998-04-01 |
Family
ID=10766172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9425616A Expired - Fee Related GB2296680B (en) | 1994-12-17 | 1994-12-17 | Method of producing a plastics composite |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2296680B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2313088A (en) * | 1996-05-17 | 1997-11-19 | Anglian Windows Ltd | Extruded plastics composite |
| GB2352677A (en) * | 1999-07-31 | 2001-02-07 | Kestrel Building Products Ltd | PVC profiles |
| CN103818072A (en) * | 2014-01-27 | 2014-05-28 | 鑫盛(湖州)塑木科技有限公司 | Multilayer plastic-wood composite board and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1444561A (en) * | 1972-09-22 | 1976-08-04 | Dynamit Nobel Ag | Continuous production of elongate section members |
| EP0026795A1 (en) * | 1979-10-09 | 1981-04-15 | Schock & Co. GmbH | Profiled building strip, especially a profile strip for the manufacture of window frames, and process for its manufacture |
| US4281492A (en) * | 1978-06-24 | 1981-08-04 | Schock & Co. | Sectional construction strip, e.g. for the production of window frames |
| GB2097710A (en) * | 1981-05-01 | 1982-11-10 | Silvatrim Ass | Padded molding strip |
| US4383812A (en) * | 1979-11-30 | 1983-05-17 | Mario Calcagni | Extrusion head for moldings to be used in the construction of window, door and the like frames |
-
1994
- 1994-12-17 GB GB9425616A patent/GB2296680B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1444561A (en) * | 1972-09-22 | 1976-08-04 | Dynamit Nobel Ag | Continuous production of elongate section members |
| US4281492A (en) * | 1978-06-24 | 1981-08-04 | Schock & Co. | Sectional construction strip, e.g. for the production of window frames |
| EP0026795A1 (en) * | 1979-10-09 | 1981-04-15 | Schock & Co. GmbH | Profiled building strip, especially a profile strip for the manufacture of window frames, and process for its manufacture |
| US4383812A (en) * | 1979-11-30 | 1983-05-17 | Mario Calcagni | Extrusion head for moldings to be used in the construction of window, door and the like frames |
| GB2097710A (en) * | 1981-05-01 | 1982-11-10 | Silvatrim Ass | Padded molding strip |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2313088A (en) * | 1996-05-17 | 1997-11-19 | Anglian Windows Ltd | Extruded plastics composite |
| GB2313088B (en) * | 1996-05-17 | 1999-04-07 | Anglian Windows Ltd | Extruded plastics composite |
| GB2352677A (en) * | 1999-07-31 | 2001-02-07 | Kestrel Building Products Ltd | PVC profiles |
| CN103818072A (en) * | 2014-01-27 | 2014-05-28 | 鑫盛(湖州)塑木科技有限公司 | Multilayer plastic-wood composite board and preparation method thereof |
| CN103818072B (en) * | 2014-01-27 | 2016-05-25 | 鑫盛(湖州)塑木科技有限公司 | A kind of multilayer wood plastic composite board and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2296680B (en) | 1998-04-01 |
| GB9425616D0 (en) | 1995-02-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20031217 |