GB2245860A - Plastics extrusion - Google Patents
Plastics extrusion Download PDFInfo
- Publication number
- GB2245860A GB2245860A GB9012484A GB9012484A GB2245860A GB 2245860 A GB2245860 A GB 2245860A GB 9012484 A GB9012484 A GB 9012484A GB 9012484 A GB9012484 A GB 9012484A GB 2245860 A GB2245860 A GB 2245860A
- Authority
- GB
- United Kingdom
- Prior art keywords
- plastics
- extrusion
- inner region
- article
- plastics article
- 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.)
- Withdrawn
Links
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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/465—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using rollers
-
- 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
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
-
- 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
- B29C48/06—Rod-shaped
-
- 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
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0088—Molecular weight
Abstract
A plastics article, such as a plastics rod, is extruded on a continuous basis using a "Conform" apparatus, the feedstock being a granular plastics polymer and conveniently ultra-high molecular weight polymer material. The extruded article has a relatively high density porous inner region with a surrounding less porous outer region.
Description
Plastics Extrusion
This invention relates to the extrusion of plastics material.
According to one aspect of the present invention, there is provided a continuous process for forming a plastics article by extrusion, the process comprising feeding a granular plastics polymer feedstock into a "Conform Apparatus" (as hereinafter defined), the apparatus having the parameters thereof and the extrusion speed selected so that the plastics article has a relatively high density porous inner region and a less porous outer region about the inner region.
In a second aspect according to the invention, there is provided apparatus for forming R plastics article by the extrusion of granular plastics polymer feedstock, the apparatus comprising a Conform Apparatus (as hereinafter defined) having the parameters thereof and the extrusion speed selected so that the plastics article has a relatively high density porous inner region and a less porous outer region about the inner region.
The plastics polymer may comprise a polymer made from a normal melt processable molecular weight polymer (eg for polyethylene Mw < 500 000) where Mw is the weight average molecular weight, or preferably ultra-high molecular weight polymer material (hereinafter referred to as "UHMWP") having a molecular weight of at least about 500,000, for example 1 x 106 The outer region may be in the melt crystallised state. The inner region may be in the partially bonded state.
The "Conform Apparatus" referred to herein comprises rotatable wheel means constituting a movable member and defining an endless groove around the wheel means for the material to be extruded, a shoe member overlying part of the length of the groove, a stationary abutment portion associated with the shoe member and projecting into the groove so as to substantially block a portion of the groove, and at least one die orifice associated with the abutment portion for extrusion of the material therethrough as the wheel means rotates. An example of a
Conform Apparatus is described in British Patent
Specification No 2218034A (United States Patent
Application Serial No 346404 filed 2 May 1989), which is incorporated by reference herein.
It will be understood that the invention also includes in a third aspect an extruded article comprising plastic material, the article having a relatively high density porous inner region, and a less porous outer region about the inner region.
The invention will now be described by way of example only with reference to the accompanying drawing, in which:
Figure 1 shows a side view in part-section of a
Conform Apparatus for continuous
extrusion;
Figure 2 shows to an enlarged scale a sectional
view on the line Il-Il of Figure 1, and
Figure 3 shows to an enlarged scale a sectional
view on the line Ill-Ill of Figure 1.
Referring now to Figures 1 to 3, a Conform Apparatus 10 is shown and comprises a wheel 11 rotatably mounted on a shaft 12. The wheel 11 has an endless circumferential groove 13 around its outer edge, and a shoe member 14 overlies part of the length of the groove 13. An abutment portion 15 associated with the shoe member 14 is shaped so as to project into and substantially block the groove 13. The abutment portion 15 has an extrusion orifice 16 through which plastics polymer granular material 18 in the groove 13 is extruded as the wheel 11 rotates. The shoe member 14 incorporates heating means (not shown) to maintain the shoe member 14 within a desired temperature range.
In operation, as the wheel 11 rotates at a selected speed, the granular material 18 in the groove 13 is compacted and carried forward by the frictional drag of the walls of the groove 13 and forced against the abutment portion 15. Pressure is thus generated in the material 18 so that it is rapidly compacted and extruded through the orifice 16 as a continuous rod 19 which has a relatively high density porous inner region 21 and a less porous outer region 23 about the inner region 21.
Example
Conform Apparatus
Wheel (11) outside diameter - 750 mm
Diameter at base of groove (13) - 690 mm
Width of groove (13) - 15 mm
Distance shoe member (14) (excluding the abutment portion
15) projects into groove (13) - 15mm
Shoe member (14) extends 180O around the wheel (11)
Shoe member (14) temperature range - 1350C Diameter of extrusion orifice (16) - 6 mm
Orifice extends tangentially with respect to the groove
(13)
Speed of wheel (11) - 1 > 0 rpm
Feedstock: UHMWP granules - 100pm > 0
A continuous rod 19 was extruded having a cross-sectional structure shown in Figure 3. The rod 19 had a porous inner region 21 with a high density (~940/950 kgm 3) surrounded by an outer region 23 with less porosity. The structure of the outer region may be in the melt crystallised state, and the inner region 21 may be in the almost fully bonded state.
Although the orifice 16 has been shown as extending tangentially with respect to the groove 13, the orifice 16 may extend normal to or at some other angle to the wheel 11.
It will be appreciated that other polymer granular materials may be extruded by the afore-described Conform
Apparatus.
Claims (4)
1. A process for forming a plastics article by extrusion, the process comprising feeding a granular plastics polymer fe#edstock into a "Conform Apparatus", as herein defined, the apparatus having the parameters thereof and the extrusion speed selected so that the plastics article has a relatively high density porous inner region and a less porous outer region about the inner region.
2. Apparatus for forming a plastics article by extrusion of granular plastics polymer feedstock, the apparatus comprising a "Conform Apparatus", as herein defined, having the parameters thereof and the extrusion speed selected so that the plastics article has a relatively high density porous inner region and a less porous outer region about the inner region.
3. A process for forming a plastics article by extrusion substantially as herein described with reference to the accompanying drawings.
4. Apparatus for forming a plastics article by extrusion arranged and adapted to operate substantially as herein described with reference to the accompanying drawings.
Published 1991 at The Patent Office. Concept House. Cardiff Road. Newpon. Gwent NP9 IRH Further copies may be obtained fron; Sales Branch. Unit 6. Nine Mile Point. Cwrnfetinfach. Cross Keys. NeBpon. NPI 7HZ. Printed by Multiplex techiiiques lid St Mar Craw. I
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9012484A GB2245860A (en) | 1990-06-05 | 1990-06-05 | Plastics extrusion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9012484A GB2245860A (en) | 1990-06-05 | 1990-06-05 | Plastics extrusion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9012484D0 GB9012484D0 (en) | 1990-07-25 |
| GB2245860A true GB2245860A (en) | 1992-01-15 |
Family
ID=10677079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9012484A Withdrawn GB2245860A (en) | 1990-06-05 | 1990-06-05 | Plastics extrusion |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2245860A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1206864A (en) * | 1967-04-18 | 1970-09-30 | Bernard I Bartner | A unitary elongate composite article such as a writing instrument and method of manufacturing the same |
| GB1237097A (en) * | 1967-06-22 | 1971-06-30 | Francis Butruille | Irrigation conduit and method for producing such |
| GB1319285A (en) * | 1969-07-15 | 1973-06-06 | Uniroyal Inc | Die and method for extrusion of cellular plastics |
| GB1341400A (en) * | 1971-04-16 | 1973-12-19 | Monsanto Chemicals | Cigarette filters |
| GB1592261A (en) * | 1977-05-11 | 1981-07-01 | Tadmor Z | Method and a machine for processing polymeric materials which are or become in the course of processing viscous liquids |
| GB2149714A (en) * | 1983-11-07 | 1985-06-19 | Metrode Products Limited | Extrusion process |
| GB2218034A (en) * | 1988-05-04 | 1989-11-08 | Atomic Energy Authority Uk | An extrusion process and apparatus therefor |
-
1990
- 1990-06-05 GB GB9012484A patent/GB2245860A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1206864A (en) * | 1967-04-18 | 1970-09-30 | Bernard I Bartner | A unitary elongate composite article such as a writing instrument and method of manufacturing the same |
| GB1237097A (en) * | 1967-06-22 | 1971-06-30 | Francis Butruille | Irrigation conduit and method for producing such |
| GB1319285A (en) * | 1969-07-15 | 1973-06-06 | Uniroyal Inc | Die and method for extrusion of cellular plastics |
| GB1341400A (en) * | 1971-04-16 | 1973-12-19 | Monsanto Chemicals | Cigarette filters |
| GB1592261A (en) * | 1977-05-11 | 1981-07-01 | Tadmor Z | Method and a machine for processing polymeric materials which are or become in the course of processing viscous liquids |
| GB2149714A (en) * | 1983-11-07 | 1985-06-19 | Metrode Products Limited | Extrusion process |
| GB2218034A (en) * | 1988-05-04 | 1989-11-08 | Atomic Energy Authority Uk | An extrusion process and apparatus therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9012484D0 (en) | 1990-07-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |