Radially isomeric polypropylene filament geotextile and method of making same

By using radially heterogeneous polypropylene filament cross-arrangement and thermal bonding technology, the problem of large fiber damage in polypropylene geotextile during reinforcement is solved, achieving strength enhancement and fiber protection, and meeting the needs of use in multiple environments.

CN117604722BActive Publication Date: 2026-04-07DONGHUA UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-11-23
Publication Date
2026-04-07

AI Technical Summary

Technical Problem

Existing polypropylene geotextiles suffer significant fiber damage during reinforcement, failing to meet strength requirements under different usage environments. Furthermore, traditional processes struggle to simultaneously improve strength and reduce fiber damage.

Method used

A fiber web is formed by the cross-arrangement of radially heterogeneous polypropylene filaments, and fiber clusters are formed by non-woven needle punching that are vertically embedded into the fiber web. Combined with thermal bonding technology, the crystallinity and melting point of the fibers decrease layer by layer, which enhances the entanglement and adhesion between the fibers.

Benefits of technology

It improves the strength and dimensional stability of geotextiles, reduces fiber damage, extends service life, and meets the mechanical requirements of different environments.

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Abstract

This invention relates to a radially heterogeneous polypropylene filament geotextile and its preparation method. It comprises a fiber web composed of polypropylene filaments with decreasing crystallinity and melting point from the inside out. The fiber web is formed by needle-punching polypropylene filament fiber clusters, causing the filaments to become intertwined. All overlaps between the filaments are thermally bonded together. The radially heterogeneous polypropylene filament geotextile of this invention uses polypropylene chips as raw material and is manufactured through the following steps: melting, extrusion, filtration, metering, radial heterogeneous spinning, side-blowing cooling, positive pressure airflow stretching, filament separation, web laying, oiling, pre-needling, longitudinal stretching, main needle punching, thermal bonding, cooling, and winding. In this invention, the filaments in the radially heterogeneous polypropylene filament geotextile fiber web are both intertwined and bonded together, improving tensile deformation resistance and structural stability, and extending service life.
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Citation Information

Patent Citations

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