GB2313088A - Extruded plastics composite - Google Patents
Extruded plastics composite Download PDFInfo
- Publication number
- GB2313088A GB2313088A GB9610401A GB9610401A GB2313088A GB 2313088 A GB2313088 A GB 2313088A GB 9610401 A GB9610401 A GB 9610401A GB 9610401 A GB9610401 A GB 9610401A GB 2313088 A GB2313088 A GB 2313088A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pmma
- foamed
- pvc
- plastics composite
- coextruded
- 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 23
- 239000003000 extruded plastic Substances 0.000 title description 5
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims abstract description 40
- 239000004926 polymethyl methacrylate Substances 0.000 claims abstract description 40
- 229920003023 plastic Polymers 0.000 claims abstract description 27
- 239000004033 plastic Substances 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 17
- 239000000758 substrate Substances 0.000 claims abstract description 8
- 239000002023 wood Substances 0.000 claims abstract description 5
- 239000004575 stone Substances 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 9
- 239000010410 layer Substances 0.000 claims description 8
- 238000001125 extrusion Methods 0.000 claims description 6
- 239000000049 pigment Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 239000002344 surface layer Substances 0.000 claims description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 230000001419 dependent effect Effects 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 239000004709 Chlorinated polyethylene Substances 0.000 claims description 2
- 229920001328 Polyvinylidene chloride Polymers 0.000 claims description 2
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 claims description 2
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 claims description 2
- 229920006235 chlorinated polyethylene elastomer Polymers 0.000 claims description 2
- 229920000515 polycarbonate Polymers 0.000 claims description 2
- 239000004417 polycarbonate Substances 0.000 claims description 2
- 229920002959 polymer blend Polymers 0.000 claims description 2
- 239000005033 polyvinylidene chloride Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000009432 framing Methods 0.000 abstract 1
- 229920000193 polymethacrylate Polymers 0.000 abstract 1
- 239000004088 foaming agent Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000694 effects Effects 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
- 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
- B29B17/0042—Recovery of plastics or other constituents of waste material containing plastics by agglomeration or compacting for shaping parts, e.g. multilayered parts with at least one layer containing regenerated plastic
-
- 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
- B29C48/03—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
- 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
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
- B29C48/154—Coating solid articles, i.e. non-hollow articles
- B29C48/155—Partial coating thereof
-
- 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
-
- 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
-
- 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
Abstract
A plastics composite suitable, for example, for use in the production of window framing with a simulated wood, stone or masonry finish, comprising a substrate 22 of a first plastics material, preferably PVC, which may be recycled PVC, said substrate having on at least part of its surface a layer 20 of polymethacrylate (PMMA) at least 1 / 2 mm thick.
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 a coextruded plastics composite having a uniform cross-section constituted by a first plastics material covered over at least part of its surface by a layer of foamed polymethylmethacrylate (PMMA).
It is important to appreciate that a principal advantage of forming the coextrudate of foamed PMMA, as distinct from solid PMMA, is that the foamed acrylic has a lower melt viscosity than solid acrylic, with the result that the coextrudate is easier to process and stress can be substantially reduced in the coextrudate, especially at the interface with the first plastics material.
The first plastics material is obviously required to be a material compatible with
PMMA in the coextrusion process. Possible plastics to constitute the first plastics material are ABS, polycarbonate, PVDC and CPE, etc. However, most preferably the first plastics material comprises PVC, which constitutes the substrate of a coextrusion which has a surface layer of foamed PMMA on at least one part of the substrate. Typically, for example, the coextrusion may be of a regular cross-section having three or more faces with a surface layer of foamed PMMA on one or more of said faces.
Preferably the thiclcness of the PMMA layer is at least 't2 mm.
PVC employed in the extruded composite may comprise virgin or recycled PVC or possibly a mixture thereof.
According to a second aspect of the invention, a plastics composite is produced by coextrusion in an extruder wherein a first plastics material, preferably 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.
The PVC may or may not be foamed, according to the intended use of the product.
Processing is made easier because with foamed PMMA, as distinct from solid
PMMA, there is a smaller temperature differential between the coextrudate and the substrate in the die, i.e. at the point of coextrusion.
The foamed PMMA melt preferably comprises a blend of PMMA polymers of different melt flow indices. Thus, dependent on the pigments used in the respective components of foamed PMMA polymer blend, which are dispersed to different extents in the PMMA extrudate owing to their different melt flow indices, 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 finishes, e.g. stone, masonry, etc.
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, which may be virgin or recycled material, is introduced at a hopper 12. Any additives required, such as pigments, additional stabilisers and possibly a small amount of foaming agent for some applications of the product, can be introduced on line or pre-blended.
At the die 13, a foamed PMMA (acylic) 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 uniformly 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.
The addition of the foaming agent to the PMMA enables easier processing because of the lower viscosity. This can he utilised to reduce temperature differential between the PMMA coextrudate and the substrate in the die, which in turn means that the finished product can also be subject to less stress, especially at the
PVC/PMMA interface, dependent on the preferred melt viscosity.
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. In practice, in order to obtain a wood effect finish, the foamed PMMA melt introduced at the die 13 comprises a blend of PMMA polymers of different grades, in particular with different melt flow indices, the different components of the blend incorporating different pigments. The different components thereby disperse to different extends in the PMMA extrudate, for example to produce lining or streaking in the longitudinal direction of the coextrusion. Sufficient PMMA melt is introduced at the die 13 to produce a PMMA layer at least 1/2 mm thick.
The extruded plastics composite resulting from the above-described process is useful, for example, in the production of door and window frames in which the
PMMA layer will be exposed. The composite material has extremely good resistance to weathering, including discolouration.
Claims (11)
1. A coextruded plastics composite having a uniform cross-section constituted by a first plastics material covered over at least part of its surface by a layer of foamed polymethylmethacrylate (PMMA), the thickness of the PMMA layer being at least 1h mm.
2. A coextruded plastics composite according to claim 1, wherein the foamed acrylic has a lower melt viscosity than solid acrylic such that stress is substantially reduced in the coextrudate at the interface with the first plastics material.
3. A coextruded plastics composite according to claim 1 or claim 2, wherein the first plastics material is ABS or polycarbonate or PVDC or CPE.
4. A coextruded plastics composite according to claim 1 or claim 2, wherein the first plastics material comprises PVC, which constitutes the substrate of a coextrusion which has a surface layer of foamed PMMA on at least one part of the substrate.
5. A coextruded plastics composite according to any of claims 1 to 4, wherein the coextrusion is of a regular cross-section having three or more faces with a surface layer of foamed PMMA on one or more of said faces.
6. A coextruded plastics composite according to claim 4 or claim 5 when appendant to claim 4, wherein the PVC employed in the extruded composite comprises at least partly recycled PVC.
7. A method of producing a plastics composite by coextrusion in an extruder, wherein a first plastics material, preferably 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 and produce a surface layer thereon of at least mm thickness.
8. A method acording to claim 7, wherein the PVC is foamed or not, according to the intended use of the product.
9. A method according to claim 7 or claim 8, wherein the foamed PMMA melt comprises a blend of PMMA polymers of different melt flow indices.
10. A method according to claim 9, wherein, dependent on the pigments used in the respective components of foamed PMMA polymer blend, which are dispersed to different extents in the PMMA extrudate owing to their different melt flow indices, different wood or stone or masonry finishes are simulated.
11. A coextruded plastics composite produced by the method hereinbefore described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9610401A GB2313088B (en) | 1996-05-17 | 1996-05-17 | Extruded plastics composite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9610401A GB2313088B (en) | 1996-05-17 | 1996-05-17 | Extruded plastics composite |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9610401D0 GB9610401D0 (en) | 1996-07-24 |
| GB2313088A true GB2313088A (en) | 1997-11-19 |
| GB2313088B GB2313088B (en) | 1999-04-07 |
Family
ID=10793912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9610401A Expired - Fee Related GB2313088B (en) | 1996-05-17 | 1996-05-17 | Extruded plastics composite |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2313088B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2352677A (en) * | 1999-07-31 | 2001-02-07 | Kestrel Building Products Ltd | PVC profiles |
| EP1632332A1 (en) * | 2004-08-03 | 2006-03-08 | Ticinoplast S.R.L. | Method and device for recycling a mixture of polymethylmethacrylate and/or acrylonitrile-butadiene-styrene and crosslinked polymethylmethacrylate |
| CN101746034B (en) * | 2009-12-30 | 2013-04-10 | 王远孔 | Method for fabricating three-layer co-extruded composite section |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115806714B (en) * | 2022-12-30 | 2024-03-22 | 苏州朗建塑胶科技有限公司 | PMMA/CPE composite material and preparation method and application thereof |
Citations (6)
| 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 |
| GB2296680A (en) * | 1994-12-17 | 1996-07-10 | Anglian Windows Ltd | Extruded plastics composite |
-
1996
- 1996-05-17 GB GB9610401A patent/GB2313088B/en not_active Expired - Fee Related
Patent Citations (6)
| 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 |
| GB2296680A (en) * | 1994-12-17 | 1996-07-10 | Anglian Windows Ltd | Extruded plastics composite |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2352677A (en) * | 1999-07-31 | 2001-02-07 | Kestrel Building Products Ltd | PVC profiles |
| EP1632332A1 (en) * | 2004-08-03 | 2006-03-08 | Ticinoplast S.R.L. | Method and device for recycling a mixture of polymethylmethacrylate and/or acrylonitrile-butadiene-styrene and crosslinked polymethylmethacrylate |
| CN101746034B (en) * | 2009-12-30 | 2013-04-10 | 王远孔 | Method for fabricating three-layer co-extruded composite section |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2313088B (en) | 1999-04-07 |
| GB9610401D0 (en) | 1996-07-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20040517 |