Core-sheath type composite monofilament and its manufacturing method

The core-sheath composite monofilament with a polyvinylidene fluoride and thermoplastic elastomer core, and polyamide sheath, addresses the abrasion resistance issue by enhancing adhesion and reducing friction, suitable for fishing lines and tennis racket strings.

JP2025044317APending Publication Date: 2025-04-02UNITIKA LTD
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Patent Information

Application Number
JP2023151805
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-09-20
Publication Date
2025-04-02

AI Technical Summary

Technical Problem

Existing core-sheath composite monofilaments made of polyvinylidene fluoride and polyamide resins lack sufficient abrasion resistance due to inadequate adhesion between the core and sheath components.

Method used

A core-sheath composite monofilament is developed with a core component composed of a resin blend of polyvinylidene fluoride and a thermoplastic elastomer, and a sheath component of polyamide resin, featuring a multi-lobed cross-sectional core shape and a circular overall shape, with optional addition of a release agent to the polyamide resin to enhance adhesion and reduce friction.

Benefits of technology

The improved adhesion and reduced friction coefficient enhance the abrasion resistance of the monofilament, making it resistant to breakage from repeated friction, suitable for use as fishing lines and tennis racket strings.

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Abstract

To provide a composite monofilament with improved abrasion strength.SOLUTION: A composite filament is a core-sheath type composite monofilament in which the core component is a resin composition containing polyvinylidene fluoride resin and polyester thermoplastic elastomer and the sheath component is polyamide resin. The sheath component may contain silicone oil as a mold-releasing agent. The cross-sectional shape of the entire core-sheath type composite monofilament is circular, and the cross-sectional shape of the core component is multilobed. The multilobed type means that it has a plurality of leaf portions 1, which are outwardly protruding portions, and a central portion 2 inside the leaf portions 1. This core-sheath type composite monofilament is suitable for use as a fishing line.SELECTED DRAWING: Figure 1
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