Method and apparatus for depositing moisture-absorbent and thermoplastic material in a substrate
US5143680A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 1990 |
| Grant date | Sep 1, 1992 |
| Priority date | — |
| Expiry date | May 17, 2010 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F13/535
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method and apparatus for forming a non-woven pad of fibrous material is provided in which highly moisture-absorbent particles and fibers of thermoplastic material are intermixed with the fibrous material throughout one or more predetermined portions of the thickness of the non-woven pad while maintaining other portions of the thickness of the pad substantially free of highly moisture-absorbent particles and/or thermoplastic fiber material. The non-woven pad is formed on one side of a conveyor moving through a forming chamber which has a duct connected to a source of vacuum operable to draw fibrous material injected into the chamber onto the conveyor. One dispenser discharges the highly moisture-absorbent material at a predetermined location relative to the fibrous material being drawn onto the conveyor, and at least one other dispenser discharges the thermoplastic fiber material into the chamber at a location to intermix the thermoplastic fiber material with the fibrous material and highly moisture-absorbent material being drawn onto the conveyor at the predetermined location, and/or to intermix the thermoplastic fiber materials with the fibrous material in areas of the thickness…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.