CA2235547A1 - Regular division of melt flow in extrusion of blown films - Google Patents
Regular division of melt flow in extrusion of blown filmsInfo
- Publication number
- CA2235547A1 CA2235547A1 CA002235547A CA2235547A CA2235547A1 CA 2235547 A1 CA2235547 A1 CA 2235547A1 CA 002235547 A CA002235547 A CA 002235547A CA 2235547 A CA2235547 A CA 2235547A CA 2235547 A1 CA2235547 A1 CA 2235547A1
- Authority
- CA
- Canada
- Prior art keywords
- flow
- ring
- distribution ring
- feed
- distribution
- 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
- 238000001125 extrusion Methods 0.000 title abstract 2
- 230000006798 recombination Effects 0.000 abstract 2
- 238000005215 recombination Methods 0.000 abstract 2
- 230000002939 deleterious effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 238000012667 polymer degradation Methods 0.000 abstract 1
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
An extrusion die having a plurality of die layers stacked one upon the other in a direction generally parallel to the central axis. Each of the layers has an annular flow distribution ring (40) having an outer generally cylindrical surface and an annular feed ring surrounding and engaging the outer surface of the distribution ring (42, 42d). At the engaged surfaces of the feed and distribution ring, the flow from the feed ring is divided into a number of substantially equal flow portions. Seals (43a, 43b) between adjacent engaged surfaces confine the flow between the circumferential surfaces of the feed and distribution ring. Half of the flow portions are directed to a recombination region (45, 46) on one side of the distribution ring (42d), and half are directed to a recombination region (45, 46) on the other side of the ring (42d). In recombining, weld lines are formed in high flow areas minimizing the deleterious effect of polymer degradation. Subsequently, the flows on the opposite sides of the distribution ring (42d) are recombined such that the weld lines from one half are first modified to exhibit lower flow and then are layered with non-weld line portions modified to exhibit higher flow from the other half. This further minimizes the negative effect of weld line areas. Flow from the two sides is regularly divided to yield even distribution of the combined flows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002526196A CA2526196C (en) | 1996-08-26 | 1997-08-26 | Regular division of melt flow in extrusion of blown films |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/702,917 US6190152B1 (en) | 1996-08-26 | 1996-08-26 | Regular division of molten extrusion flow |
| US08/702,917 | 1996-08-26 | ||
| PCT/US1997/014952 WO1998008669A1 (en) | 1996-08-26 | 1997-08-26 | Regular division of melt flow in extrusion of blown films |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002526196A Division CA2526196C (en) | 1996-08-26 | 1997-08-26 | Regular division of melt flow in extrusion of blown films |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2235547A1 true CA2235547A1 (en) | 1998-03-05 |
| CA2235547C CA2235547C (en) | 2006-03-21 |
Family
ID=36101539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002235547A Expired - Fee Related CA2235547C (en) | 1996-08-26 | 1997-08-26 | Regular division of melt flow in extrusion of blown films |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2235547C (en) |
-
1997
- 1997-08-26 CA CA002235547A patent/CA2235547C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2235547C (en) | 2006-03-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20160826 |