IT1298503B1 - 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
IT1298503B1
IT1298503B1 ITMI980157A IT1298503B1 IT 1298503 B1 IT1298503 B1 IT 1298503B1 IT MI980157 A ITMI980157 A IT MI980157A IT 1298503 B1 IT1298503 B1 IT 1298503B1
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 ITMI980157 priority Critical patent/IT1298503B1/en
Priority to EP98103798A priority patent/EP0864412A2/en
Priority to CA002229627A priority patent/CA2229627A1/en
Publication of ITMI980157A1 publication Critical patent/ITMI980157A1/en
Application granted granted Critical
Publication of IT1298503B1 publication Critical patent/IT1298503B1/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.
ITMI980157 1997-03-13 1998-01-28 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 IT1298503B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
ITMI980157 IT1298503B1 (en) 1998-01-28 1998-01-28 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
ITMI980157 IT1298503B1 (en) 1998-01-28 1998-01-28 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
ITMI980157A1 ITMI980157A1 (en) 1999-07-28
IT1298503B1 true IT1298503B1 (en) 2000-01-12

Family

ID=11378741

Family Applications (1)

Application Number Title Priority Date Filing Date
ITMI980157 IT1298503B1 (en) 1997-03-13 1998-01-28 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) IT1298503B1 (en)

Also Published As

Publication number Publication date
ITMI980157A1 (en) 1999-07-28

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Legal Events

Date Code Title Description
0001 Granted