D - Textiles – Paper – 04 – H
Patent
D - Textiles, Paper
04
H
154/75
D04H 1/58 (2006.01) B32B 5/14 (2006.01) D04H 1/72 (2006.01)
Patent
CA 1037368
Abstract of the Disclosure A method for producing a multi-layer web, and the web produced thereby, are disclosed. The nonwoven web consists of two half-thickness portions laminated to each other. A first half-thickness portion is characterized by a given overall concentration of long and short fibers and has one face enriched in long fibers above the over- all concentration and the other face enriched in short fibers above the overall concentration. The concentra- tions of long and short fibers decrease substantially uniformly from the enriched faces to form a transition region within the half-thickness portion. The second half-thickness portion is bonded to the short fiber- enriched face of the first half-thickness portion and has an outer face (opposite the bonded face) of substantial structural integrity as compared to the short length fiber-enriched face of the first half-thickness portion. In the preferred embodiment, the second half-thickness portion is similar to the first half-thickness portion and bonded in mirror image relationship thereto. The method produces two half-thickness portions which are bonded together to form a multi-layer web. A first half-thickness portion is produced by feeding long and short fibers at given concentrations to individual- izing means. The individualized fibers are deposited on a moving foraminous belt to produce a half-thickness portion enriched with long fibers at one face and short fibers at the other face and having a transition of fiber concentra- tions between the faces. A second half-thickness portion having at least an outer face with greater structural integrity than the short fiber-enriched face of the first -1- half-thickness portion is produced by air-laying techniques. The second half-thickness portion is bonded with its outer Pace opposite the pulp-enriched face of the first half- thickness. -1a-
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