To obtain a composite nonwoven fabric having high interlaminar peeling strength, flexibility and filtering performance by preparing a filament web consisting of an ultrafine splittable filament group composed of a high-melting polymer and a low-melting polymer and a stable fiber web composed of core-sheath conjugate staple fiber and integrating the webs by three-dimensional interlocking treatment.
The objective nonwoven fabric is produced by laminating a filament web consisting of an ultrafine split filament group composed of a fiber-forming low- melting polymer A and a fiber-forming high-melting polymer B incompatible with the polymer A and having a melting point higher than that of the polymer A by 30-180°C and obtained by splitting a splittable bicomponent conjugate filament composed of the polymers A and B to a staple fiber web consisting of a core-sheath conjugate staple fiber having a fiber-forming low-melting polymer C as the sheath part and a fiber-forming high-melting polymer D as the core part and integrating the filament web to the staple fiber web by the three-dimensional interlocking of the constituent fibers of the filament web with each other, the constituent fiber of the filament web to that of the stable fiber web and the constituent fibers of the staple fiber web with each other.
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YONEZAWA YASUHIRO
MATSUNAGA MAMIKO
Next Patent: WEATHER-PROOF FILAMENT NONWOVEN FABRIC