Soft thermoplastic fiber webs and method of making

Details Soft thermoplastic fiber webs and method of making Soft thermoplastic fiber webs and method of making

1982-02-24

1984-04-17

Bell, James J.

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Including heat exchanger for reaction chamber or reactants...

2642222, 2642296, 422171, 422224, 422227, 422228, 422296, 422297, 422298, 422303, 422903, 422910, B32B 300

Patent

active

044435134

ABSTRACT:
A soft nonwoven web of entangled fibers or filaments having a pattern of fused bond areas and a stretched, loopy filament configuration outside of the patterned bond areas. The result is a soft web with high bulk that retains to a high degree the original bonded strength properties. In one embodiment, product may be obtained by pattern bonding a meltblown microfiber web under conditions of heat and pressure and then stretching the web under controlled conditions up to preferably about 140% of its original dimension in at least one direction. When relaxed, the stretched filaments bulk and loop except in the fused bond areas where they retain bonding properties. Preferred stretching conditions include room temperature and the use of draw rolls at speed differentials producing the desired stretch. Examples of thermoplastics polymers useful in accordance with the invention include polypropylene, polyethylene, polyesters and polyamides, as well as copolymers and polymer blends. Laminates of these nonwoven webs may also be treated. Uses for the material of the invention include any of those nonwoven fabric applications where softness and bulk are desired attributes such as, for example, wipers, garments, surgical drapes, and the like.

REFERENCES:
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patent: 3978185 (1976-08-01), Bunten et al.
patent: 4041203 (1977-08-01), Brock et al.
patent: 4048364 (1977-09-01), Harding et al.
patent: 4107364 (1978-08-01), Sisson
patent: 4187343 (1980-02-01), Akiyama et al.
patent: 4223059 (1980-09-01), Schwarz
patent: 4276336 (1981-06-01), Sabee
patent: 4307143 (1981-12-01), Meitner
patent: 4324752 (1982-04-01), Newton et al.

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