Paper making and fiber liberation – Processes and products – Non-uniform – irregular or configured web or sheet
Patent
1975-12-19
1978-01-24
Fisher, Richard V.
Paper making and fiber liberation
Processes and products
Non-uniform, irregular or configured web or sheet
162149, 162211, 162348, D21H 502
Patent
active
040702359
ABSTRACT:
A nonwoven fabric having alternating stripes of high fiber density and low fiber density has fibers of at least 1/2 inch in length and fibers of less than 1/2 inch in length, preferably under 1/4 inch in length. The fabric is made in such a manner as to produce parallel twistless ribbon strands in the high fiber density areas containing both short and long fibers. The twistless ribbon strands are bridged together by the long fibers so as to form the nonwoven fabric. A majority of the bridging long fibers have at least a portion of their length included in adjacent twistless ribbon strands; said ribbon strands having at least one strand width space between said ribbon strands. A majority of said short fibers are disposed in said high fiber density areas together with a majority of said long fibers, both being oriented in substantially one direction, for example, the machine direction, while substantially all of the long fibers in the adjacent and bridging low fiber density areas are oriented in a direction substantially normal to that direction.
REFERENCES:
patent: 3350260 (1967-10-01), Johnson
patent: 3775244 (1973-11-01), Hubschmann
patent: 3822183 (1974-07-01), McKnight
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