Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1983-09-20
1986-06-03
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
264187, 264200, 264207, 264217, 4251311, 425224, B29C 4704
Patent
active
045928851
ABSTRACT:
A method for manufacturing film without melt fracturing in which a flow of a polymer solution having a high viscosity extruded from a die slit onto a running and spreading plane is extruded through the die slit together with a low viscosity solution with the polymer solution is covered by the low viscosity solution. In a first preferred embodiment, the low viscosity solution is passed through a confluence tube so as to surround the high viscosity solution in the form of a coaxial cylinder after which the two solutions are passed through a slit die which maintains the covering relationship between the high and low viscosity solutions. In another preferred embodiment, a slit die is provided which has a central passage into which the high viscosity fluid is supplied and side passages of a slit-like shape similar to that of the main passage into which the low viscosity solution is supplied.
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Higuchi Zenichi
Ichino Shuichi
Kuroki Motoharu
Fuji Photo Film Co. , Ltd.
Thurlow Jeffery
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