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EP0187236A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Process for producing nonwoven fabrics suited for use as wipers

Assignee: Kuraray Co Ltd
•
Filing: 1985-11-19
•
Granted: —
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Expires: 2005-11-19
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Abstract

Abstract @ Nonwoven fabrics showing rubber-like elasticity in a wet condition, having good wear resistance and strength and retaining flexibility even in a dry condition are obtained by causing a nonwoven fabric containing, as essential constituent fibers, 60-90 weight percent of highly shrinkable polyvinyl alcohol fibers capable of absorbing water to shrink of which a maximum shrinking temperature in water is within the range of 65-90°C with a maximum shrinkage percentage of not less than 50 percent and 10-40 weight percent of binder fibers having a melting point not higher than 200°C to shrink by warm water treatment to an extent such that the areal reduction amounts to 35-65 percent and further melting the surface of the binder fibers by heating.

Inventors

  • 👤 Tsuneo Genba
  • 👤 Shingo Nakanishi
  • 👤 Yoshihisa Imura

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-04 23:56
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/54

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 107 words
A process for producing nonwoven fabrics suited for use as wipers which comprises first causing a nonwoven fabric containing, as essential constituent fibers, 60-90 weight percent of highly shrinkable polyvinyl alcohol fibers capable of absorbing water to shrink of which a maximum shrinking temperature in water is within the range of 65-90°C with a maximum shrinkage percentage of not less than 50 percent and 10-40 weight percent of binder fibers having a melting point not higher than 200°C to shrink by warm water treatment to an extent such that the areal reduction amounts to 35-65 percent and further melting the surface of the binder fibers by heating.
Claim 2
Dependent Claim 107 words
A process for producing nonwoven fabrics suited for use as wipers which comprises first causing a nonwoven fabric containing, as essential constituent fibers, 60-90 weight percent of highly shrinkable polyvinyl alcohol fibers capable of absorbing water to shrink of which a maximum shrinking temperature in water is within the range of 65-90°C with a maximum shrinkage percentage of not less than 50 percent and 10-40 weight percent of binder fibers having a melting point not higher than 200°C to shrink by warm water treatment to an extent such that the areal reduction amounts to 35-65 percent and further melting the surface of the binder fibers by heating.
Claim 3
Dependent Claim 32 words
The process of Claim 1, wherein a polyurethane resin is caused to be taken up by the nonwoven fabric in an amount of 2-30 percent by weight on the fiber weight basis.
Claim 4
Dependent Claim 24 words
The process of Claim 1, wherein the binder fiber surface melting is effected by passing the nonwoven fabric through a heated calender roll unit.
Claim 5
Dependent Claim 21 words
The process of Claim 3, wherein the calender roll clearance is 1/2 to 1/4 of the thickness of the nonwoven fabric.

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