Hollow fiber membrane and method for manufacturing the same

The hollow fiber membrane with controlled pore diameters and hydrophilic polymer distribution addresses clogging issues, ensuring high water permeability and extended operation through depth filtration.

JP2026121520APending Publication Date: 2026-07-24TORAY INDUSTRIES INC
View PDF 2 Cites 0 Cited by

Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
TORAY INDUSTRIES INC
Filing Date
2026-05-20
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Hollow fiber membranes used in water treatment and food processing face issues of clogging due to the formation of a layer on the membrane surface, leading to increased filtration pressure and decreased filtration speed, particularly when processing fermented liquids like beer and wine.

Method used

A hollow fiber membrane structure with a larger pore diameter on one side and a minimum pore diameter layer within the film thickness, incorporating a hydrophilic polymer on the surface and inside the spherical structure, with controlled ratios and diameters to enhance antifouling properties and maintain water permeability.

Benefits of technology

The membrane exhibits excellent stain resistance and maintains high water permeability by dispersing clogging components throughout the thickness direction, reducing filtration resistance and extending operational lifespan.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure 2026121520000001_ABST
    Figure 2026121520000001_ABST
Patent Text Reader

Abstract

The aim is to improve stain resistance while maintaining water permeability, that is, to suppress clogging in the membrane. [Solution] The hollow fiber membrane of the present invention comprises a spherical structure containing a polyvinylidene fluoride resin, wherein a hydrophilic polymer is present on the surface and inside the spherical structure, and the hydrophilic polymer present inside the spherical structure accounts for 70% by mass or less of the total hydrophilic polymer contained in the entire hollow fiber membrane, with the amount of the hydrophilic polymer being 1.0 part by mass or more per 100 parts by mass of the polyvinylidene fluoride resin.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Light bulb base and method of assembling the light bulb base

    JP2016510166A

  • Hollow fiber membrane, manufacturing method of hollow fiber membrane, and production method of beer, wine or japanese sake using hollow fiber membrane

    JP2019130522A