Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1979-08-24
1981-04-28
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
264178F, D01D 104
Patent
active
042645557
ABSTRACT:
A process for the production of monofilaments of polyvinylidene fluoride is disclosed wherein polyvinylidene fluoride is plasticized in an extruder and fed to an extrusion die and passed through an extrusion nozzle orifice to enter a liquid cooling medium having a thermal conductivity of under 0.4 W/m .degree.K., a viscosity at 100.degree. C. of over 0.5 cp and a density at 100.degree. C. of over 1.1 g/cm.sup.3. Extusion is performed by passing the plasticized polyvinylidene fluoride over separate extrusion zones such as by passing the polyvinylidene fluoride over a first extrusion zone maintained at a first extrusion temperature and thereafter passing the polyvinylidene fluoride through a second extrusion zone maintained at a temperature of 10 to 30 percent higher than the preceeding extrusion zone. An apparatus for carrying out the process is also described.
REFERENCES:
patent: 3376370 (1968-04-01), Koblitz et al.
patent: 3707592 (1972-12-01), Ishi et al.
patent: 3941860 (1976-03-01), Couchoud et al.
patent: 4039634 (1977-08-01), Couchoud et al.
Lang Egon
Nachtigall Wilhelm
Stark Joachim
Dynamit Nobel AG
Woo Jay H.
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