Continuous manufacturing methods for positive temperature coeffi

Details Continuous manufacturing methods for positive temperature coeffi Continuous manufacturing methods for positive temperature coeffi

1996-04-12

1998-09-29

Kopec, Mark

Plastic and nonmetallic article shaping or treating: processes

Direct application of electrical or wave energy to work

Measuring, testing, or inspecting

264412, 264401, 252511, 252512, H01B 120, B29C 7058, B29C 7088

Patent

active

058142649

ABSTRACT:
A method for producing a conductive polymeric composition exhibiting PTC behavior. The method includes the steps of: providing a quantity of polymer component having a melting point temperature T.sub.mp, and a quantity of conductive filler component; mixing the quantity of polymer component and the quantity of conductive filler component in a receiving unit at a temperature greater than T.sub.mp to form a molten mixture; forcing the molten mixture from the receiving unit to form an element having an electrical resistivity; measuring the electrical resistivity of the element; comparing the measured electrical resistivity of the element to a predetermined electrical resistivity value; and, adjusting the quantity of conductive filler component relative to the quantity of polymer component based on the comparison between the measured electrical resistivity of the element and the predetermined electrical resistivity value to achieve a desired element having an electrical resistivity approximately equal to the predetermined electrical resistivity value.

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