Heat shrink tubing, heat shrink tubing components, wire splices, and wire harnesses

A heat-shrinkable tube with a fluororesin outer and inner layer design addresses sealing failures in high-temperature environments, ensuring durable and effective sealing for high-heat-resistant wires.

JP2026084367APending Publication Date: 2026-05-21SUMITOMO ELECTRIC FINE POLYMER INC +1
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
SUMITOMO ELECTRIC FINE POLYMER INC
Filing Date
2024-11-11
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

Heat-shrinkable tubes used for high-heat-resistant insulated wires, such as ETFE wires, fail to maintain excellent sealing performance in high-temperature environments due to inadequate sealing properties during heating and shrinking.

Method used

A heat-shrinkable tube comprising a cylindrical outer layer made of a first fluororesin and an inner layer made of a second fluororesin, with specific shear viscosities and storage moduli to ensure appropriate fluidity and adhesion, maintaining sealing properties in high-temperature environments.

Benefits of technology

The tube achieves excellent sealing performance during heat shrinkage and maintains sealing integrity in high-temperature environments, preventing intrusion of acids, alkalis, and oils, while ensuring good adhesion and durability.

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Abstract

The present invention provides a heat-shrinkable tube that exhibits excellent sealing properties when heated and shrinks, and maintains excellent sealing properties even when used in high-temperature environments, as well as a heat-shrinkable tube component, and a wire splice and wire harness using a heat-shrinkable tube or a heat-shrinkable tube component. [Solution] A heat-shrinkable tube comprising a cylindrical outer layer and an inner layer disposed on the inner circumferential surface of the outer layer, wherein the outer layer contains a first fluororesin, the inner layer mainly contains a second fluororesin, the shear viscosity of the inner layer at 215°C and a shear rate of 10 / s is 300 Pa·s or more and 10000 Pa·s or less, and the shear viscosity of the inner layer at 200°C and a shear rate of 1 / s is 3000 Pa·s or more and 70000 Pa·s or less.
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