Effective utilization of sap in producing non-woven webs using t

Details Effective utilization of sap in producing non-woven webs using t Effective utilization of sap in producing non-woven webs using t

1998-04-30

2000-02-01

Chin, Peter

Paper making and fiber liberation

Processes and products

Pore forming in situ

162100, 162123, 162124, 162125, 162127, 162129, 1621681, 162183, 162212, D21H 2302

Patent

active

060198710

ABSTRACT:
The foam process is used to make non-woven webs from cellulose or synthetic fibers, which webs have as a component super absorbent polymer (SAP). In order to minimize water absorbency by the SAP, it may have a protective coating that dissolves only after in contact with water a few seconds; the SAP may be frozen (e.g. to about -18.degree. C.); and/or the SAP may be transported by highly chilled (e.g. about 1.degree. C.) water. The SAP, and liquid or foam carrier, is fed as a small volume flow into a conduit carrying a high volume flow of a fiber containing foam slurry, just before a foraminous element. A mechanical mixer may be provided in the conduit for mixing the SAP with the fiber-foam slurry. The addition of the SAP to the carrier fluid takes place no more than ten seconds (preferably no more than five seconds) before the fiber-foam slurry mixed with SAP is brought into operative association with one or more foraminous elements. The SAP in the formed web, before drying, has a dry content of at least 20% (typically between about 30-40+%).

REFERENCES:
patent: 4344818 (1982-08-01), Nuttall et al.
patent: 4986882 (1991-01-01), Mackey et al.
patent: 5607550 (1997-03-01), Akers
patent: 5651862 (1997-07-01), Anderson et al.
patent: 5795439 (1998-08-01), Euripides et al.

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