IT1290068B1 - Annular extrusion head for producing tubular film of constant thickness - has cylindrical body with helical channels feeding molten polymer to annular die gap served by a feed conduit via a symmetrical tree-shaped structure of identical branching channels - Google Patents
Annular extrusion head for producing tubular film of constant thickness - has cylindrical body with helical channels feeding molten polymer to annular die gap served by a feed conduit via a symmetrical tree-shaped structure of identical branching channelsInfo
- Publication number
- IT1290068B1 IT1290068B1 ITMI970561A IT1290068B1 IT 1290068 B1 IT1290068 B1 IT 1290068B1 IT MI970561 A ITMI970561 A IT MI970561A IT 1290068 B1 IT1290068 B1 IT 1290068B1
- Authority
- IT
- Italy
- Prior art keywords
- channels
- annular
- die gap
- cylindrical body
- shaped structure
- Prior art date
Links
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
Annular extrusion head for producing tubular film has at least one cylindrical body (2) with a sleeve (1) fitted over it enclosing channels (6) on its surface leading into an extrusion chamber (4) having an annular die gap (5) at its upper end, molten material being fed through the channels to exit through the die gap. The molten material is fed to the channels by a feed conduit (3) connected to them via a symmetrical tree-shaped structure having branching off points, the number of branches being the same as the number of channels and the path of the material coming from the conduit being identical for all channels.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT97MI000561 IT1290068B1 (en) | 1997-03-13 | 1997-03-13 | Annular extrusion head for producing tubular film of constant thickness - has cylindrical body with helical channels feeding molten polymer to annular die gap served by a feed conduit via a symmetrical tree-shaped structure of identical branching channels |
EP98103798A EP0864412A2 (en) | 1997-03-13 | 1998-03-04 | Annular extrusion head for the production of blown tubular films |
CA002229627A CA2229627A1 (en) | 1997-03-13 | 1998-03-11 | Annular extrusion head for the production of blown tubular films |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT97MI000561 IT1290068B1 (en) | 1997-03-13 | 1997-03-13 | Annular extrusion head for producing tubular film of constant thickness - has cylindrical body with helical channels feeding molten polymer to annular die gap served by a feed conduit via a symmetrical tree-shaped structure of identical branching channels |
Publications (2)
Publication Number | Publication Date |
---|---|
ITMI970561A1 ITMI970561A1 (en) | 1998-09-13 |
IT1290068B1 true IT1290068B1 (en) | 1998-10-19 |
Family
ID=11376406
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT97MI000561 IT1290068B1 (en) | 1997-03-13 | 1997-03-13 | Annular extrusion head for producing tubular film of constant thickness - has cylindrical body with helical channels feeding molten polymer to annular die gap served by a feed conduit via a symmetrical tree-shaped structure of identical branching channels |
Country Status (1)
Country | Link |
---|---|
IT (1) | IT1290068B1 (en) |
-
1997
- 1997-03-13 IT IT97MI000561 patent/IT1290068B1/en active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
ITMI970561A1 (en) | 1998-09-13 |
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