HEAT-SHRINKABLE TUBE WITH TEARING CHARACTERISTIC

摘要

PROBLEM TO BE SOLVED: To provide a heat-shrinkable tube made of fluorine resin having a high heat shrinkage factor at a low temperature including a superior tearing direct advance characteristic.SOLUTION: This invention relates to a tubing containing at least fluorine resin as base resin in which a thickness of high-molecular entanglement unit observed at a section in a longitudinal direction of the tube is 1 to 9 μm after shrinkage of more than 35% at 200°C. In order to control inter-molecular entanglement strength, there are provided mainly two methods. One of them is a control of entanglement strength through dispersion control of additive agent for improving a tearing characteristic and the other is a control of entanglement strength through inter-molecular entanglement control of base resin.SELECTED DRAWING: Figure 3