Method of stretching and polarizing polymer materials

Details Method of stretching and polarizing polymer materials Method of stretching and polarizing polymer materials

1990-02-24

1993-03-09

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264 24, 264 26, 264104, 2642884, 264DIG46, 4251744, 4251748E, B29C 3508

Patent

active

051924706

ABSTRACT:
A sheet of polymer material is secured between a pair of clamp members. The sheet is directed through a localized heated region to provide a localized heated portion of said sheet. A first one of said clamp members is pulled away from a second fixed clamp member to stretch said sheet providing a pair of neckdown region portions and a reduced thickness portion or stretched portion of the sheet. One of the neckdown regions propagates along unstretched portions of the sheet as the clamp member moves away from the fixed clamp member. The propagating neckdown region is kept within the localized heated region by moving the localized heated region and an electric field is applied to the propagating neckdown region portion to polarize the sheet.

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patent: 4512940 (1985-04-01), Anderson
patent: 4518555 (1985-05-01), Ravinet et al.
patent: 4800048 (1989-01-01), Bloomfield et al.

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