Extrusion of films of vinylidene fluoride polymers

Details Extrusion of films of vinylidene fluoride polymers Extrusion of films of vinylidene fluoride polymers

1982-11-16

1984-11-06

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264127, 264178R, 2642101, 2642102, 2642896, B29D 724

Patent

active

044811586

ABSTRACT:
The film (11) extruded from a vinylidene fluoride polymer is subjected to a stretching of at least 200% while still in the molten state, and then cooled rapidly to a temperature below 50.degree. C.
The equipment comprises, in series, an extruding device (1) (2), a cooling device consisting of a thermostatically controlled liquid bath (6), the level of which is located at a distance of 10 to 300 mm from the extruding device, and a device (8) (9) for stretching the extruded film by at least 200% in its part located between the extruding device and the cooling device.
The film obtained is suitable for manufacturing piezoelectric films.

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patent: 4390674 (1983-06-01), Ward et al.
"Electric-Field-Induced Phase Charger in Poly (Vinylidine Fluoride)", Davis et al., J. Appl. Phys. 49 (10) Oct. 78, pp. 4998-5002.

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