Title:
METHOD FOR PRODUCING WIDE FILTER SUBSTRATE
Document Type and Number:
Japanese Patent JP2022087399
Kind Code:
A
Abstract:
To provide a method for producing even a wide filter substrate 4-5 m wide with its fuzzing being prevented relatively uniformly in the width direction.SOLUTION: As a core component, a polyethylene terephthalate with a melting point of 256°C and a relative viscosity of ηR1.38 is prepared. As a sheath component, a copolyester with a melting point of 230°C and a relative viscosity of ηR1.37 is prepared. The core component and the sheath component are fed to a composite melting spinning device to spin sheath-core composite long fibers and accumulating them like a sheet, thereby obtaining fiber fleece 4-5 m wide. The fiber fleece is passed between a pair of heating rolls each of which is 4-5 m long in the axial direction. The fiber fleece is thus heated and pressurized, causing the sheath component of the sheath-core composite long fibers to be softened or melted, leading to mutual fusing and fixing of the sheath-core composite long fibers, resulting in a filter substrate.SELECTED DRAWING: Figure 1
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Inventors:
MORIOKA TATSUTA
YAMADA MEGUMI
YAMADA MEGUMI
Application Number:
JP2020199314A
Publication Date:
June 13, 2022
Filing Date:
December 01, 2020
Export Citation:
Assignee:
UNITIKA LTD
International Classes:
B01D39/16; D01F8/14
Attorney, Agent or Firm:
Okumura Shigeki
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