Back-to-back transition web and method of making said

Details Back-to-back transition web and method of making said Back-to-back transition web and method of making said

1973-07-09

1976-04-20

Cannon, J. C.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

156 622, 156 628, 428284, 428288, 428290, 428298, 428299, 428301, 428302, B32B 514, B32B 526, B32B 528, B32B 3112

Patent

active

039521249

ABSTRACT:
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 overall concentration and the other face enriched in short fibers above the overall concentration. The concentrations 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 individualizing 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 concentrations 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 half-thickness portion is produced by air-laying techniques. The second half-thickness portion is bonded with its outer face opposite the pulp-enriched face of the first half-thickness.

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