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 channels

Info

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
Application number
Other languages
Italian (it)
Inventor
Claudio Gini
Original Assignee
Tecno Coating Eng Srl
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tecno Coating Eng Srl filed Critical Tecno Coating Eng Srl
Priority to IT97MI000561 priority Critical patent/IT1290068B1/en
Priority to EP98103798A priority patent/EP0864412A2/en
Priority to CA002229627A priority patent/CA2229627A1/en
Publication of ITMI970561A1 publication Critical patent/ITMI970561A1/en
Application granted granted Critical
Publication of IT1290068B1 publication Critical patent/IT1290068B1/en

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.
IT97MI000561 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 IT1290068B1 (en)

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)

Also Published As

Publication number Publication date
ITMI970561A1 (en) 1998-09-13

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Legal Events

Date Code Title Description
0001 Granted