Absorbent facing and method for making the same
US4629457A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 2, 1985 |
| Grant date | Dec 16, 1986 |
| Priority date | — |
| Expiry date | Oct 2, 2005 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F13/15699
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An absorbent facing is disclosed which has significant one-way valve characteristics for aqueous fluids. The facing is produced by a process which comprises the steps of: (a) superimposing a thin polymer film and a first web comprising absorbent fibers, to form a second web; (b) heating the second web to a temperature such that the polymer film is in a formable state; (c) while the said second web is so heated, simultaneously applying shearing and compressive forces to the second web to form said polymer film into a coating on said first web, the coating comprising a fine pattern of continuous areas which lie between and interconnect discontinuous areas, wherein the polymer in the continuous areas comprises a continuous or substantially continuous coating on the surface of said first web, and wherein most of the polymer in the discontinuous areas is coated on individual fibers; and (d) cooling the coated web thus formed to cool the polymer below its forming temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.