Abstract: A PC strand is coated with rust inhibitive material of thermoplastic resin so as to wholly close spaces left around a core and peripheral wires twisted around the core, thus preventing the core and wires from rusting. The strand coated with the rust inhibitive material can be produced without being untwisted by use of an extruding machine having an auxiliary pressure head connected to a cross head.
Type:
Grant
Filed:
December 12, 1994
Date of Patent:
September 23, 1997
Assignees:
Hien Electric Industries, Times Eng., Ltd.