MANUFACTURE OF TUBULAR BODY AND MEASURING METHOD FOR ELECTRIC RESISTANCE OF TUBULAR BODY

• Main Authors: OTSU NORIHIRO, MIWA MASANOBU, MORIKOSHI MAKOTO
• Format: Patent
• Language: English
• Published: 03.10.1997
• Edition: 6
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PERFORMING OPERATIONS; PHYSICS; PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE; TESTING; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PROBLEM TO BE SOLVED: To provide a measuring method for the electric resistance of a tubular body capable of continuously measuring the electric resistance of the outer surface of the tubular body without impairing the tubular body. SOLUTION: In a method wherein a thermoplastic resin composition is shaped like a tube by melt extrusion molding, conductive rollers 21 on one side and conductive rollers 21' on the other are provided outside a tubular body T, in parallel and in the direction of intersecting the haul-off direction perpendicularly. The conductive rollers 21 and 21' are brought into contact with the outer surface of the tubular body T to measure the electric resistance of the tubular body T and extrusion equipment and/or haul-off equipment are controlled by using a measured value of the electric resistance.