EP 0000637 A1 19790207 - Method and apparatus for making fibrils of a thermoplastic polymer.
Title (en)
Method and apparatus for making fibrils of a thermoplastic polymer.
Title (de)
Verfahren und Vorrichtung zur Herstellung von Fibrillen aus einem thermoplastischen Polymer.
Title (fr)
Procédé et dispositif de fabrication de fibrilles d'un polymère thermoplastique.
Publication
Application
Priority
GB 3045677 A 19770720
Abstract (en)
Fibrils of a thermoplastic polymer are produced. A mixture of the termoplastic and a liquid, e.g. water and pentane or hexane, flows through a valve from a high to a low pressure zone. The valve contains a spring biased closure member which interrupts the flow when the pressure in the high pressure zone is too low. At low pressure the flow is unstable and the formation of fibrils is unsatisfactory. A preferred apparatus takes the form of an extruder having a spring loaded closure member on the die. The spring stops the extrusion when the pressure in the extruder is too low for satisfactory flash evaporation.
IPC 1-7
IPC 8 full level
CPC (source: EP US)
D01D 5/11 (2013.01 - EP US); D04H 1/4291 (2013.01 - EP US); D04H 1/56 (2013.01 - EP US); D04H 1/43835 (2020.05 - EP US)
Citation (search report)
- [A] US 3484899 A 19691223 - SMITH JAMES GERALD
- [A] US 3987139 A 19761019 - KOZLOWSKI JOHN H, et al
Designated contracting state (EPC)
BE DE FR GB NL SE
DOCDB simple family (publication)
EP 0000637 A1 19790207; IT 1097364 B 19850831; IT 7825945 A0 19780720; US 4183881 A 19800115
DOCDB simple family (application)
EP 78300152 A 19780714; IT 2594578 A 19780720; US 83528777 A 19770921