Wet-microcontracted paper and concomitant process

Details Wet-microcontracted paper and concomitant process Wet-microcontracted paper and concomitant process

1982-03-15

1984-04-03

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-uniform, irregular or configured web or sheet

162112, 162113, 162118, 162123, 162188, 428154, D21H 524

Patent

active

044405979

ABSTRACT:
High bulk, absorbent paper having a relatively high MD elongation at rupture, and a substantially greater stress/strain modulus in the lowest one-third of its range of MD extensibility--preferably when wet--than equally machine-direction-stretchable, purely dry-foreshortened (e.g., dry-creped) paper having substantially identical MD elongation at rupture. The process includes a differential velocity transfer of a wet-laid embryonic web having relatively low fiber consistency from a carrier to a substantially slower moving, open-mesh transfer fabric having a substantial void volume; and thereafter drying the web while precluding substantial macroscopic rearrangement of the fibers in the plane of the web. The differential velocity transfer is effected without substantial compaction of the web by avoiding substantial mechanical pressing, centrifugal slinging, air blasting, and the like. The MD stress-strain property of the paper when wet is directly related to the magnitude of the differential velocity at transfer; to the magnitude of the wet-strength property of the paper; and to the topography of the transfer fabric.

REFERENCES:
patent: 3301746 (1967-01-01), Sanford et al.
patent: 3994771 (1976-11-01), Morgan et al.
patent: 4072557 (1978-02-01), Schiel
patent: 4102737 (1978-07-01), Morton
patent: 4191609 (1980-03-01), Trokhan
patent: 4239065 (1980-12-01), Trokhan
Gunnar Stenberg, A New Papriformer from KMW, Jan. 15, 1972, vol. 75, No. 1, pp. 26-28, Translated from: Sv. Papperstidn.

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