To obtain a laminated nonwoven fabric comprising short fibers made of conjugate filament yarns of excellent cooling disposition, spinnability and drawability following their delivery from a spinneret, good in biodegradability which is controllable, rich in both moisture and water absorbability, and having enough mechanical strength to stand its practical use.
The single fiber as constituent fiber of this nonwoven fabric has the following characteristics: made up of high-melting component 1 and low-melting component 2 each consisting of biodegradable aliphatic polyester; in the fiber cross-section, the high-melting component 1 and the low-melting component 2 alternately occupies a specified range each from the center of the cross-section toward the circumference and are divided into segments each with an area equal to one another. To obtain the above constituent fiber, a melt conjugate spinning followed by drawing is conducted to produce solid and alternate-type conjugate filament yarns in such a way that both the high-melting and low-melting components 1, 2 are continuous in the direction of fiber axis and exposed onto the fiber surface, and the resultant drawn filament yarns are mechanically crimped and cut to a specified length, then carded into a short fiber web, which is, in turn, laminated with a natural fiber web followed by subjecting both the webs to ultrasonic fusing treatment into integration through partial fusing, thus affording the objective laminated nonwoven fabric.
MATSUOKA FUMIO
FUKUSHIMA CHIKAYUKI
MATSUNAGA MAMIKO
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