Apparatus for impregnating or dispersing a product in a thin substrate
US4503801A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Nov 16, 1981 |
| Grant date | Mar 12, 1985 |
| Priority date | — |
| Expiry date | Nov 16, 2001 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06F58/203
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method of dispersing a substance in a thin flexible substrate of open-celled foam structure comprising continuously moving a sheet of the substrate, applying the substance to the substrate in a melted condition at an elevated temperature, compressing the substrate, subsequently allowing the substrate to expand to its normal size and thereby draw the melted substance into the open-celled structure to impregnate the substrate and cooling the substrate to solidify the impregnated substance. The method is preferably carried out using apparatus incorporating means for controlling the quantity of substance applied to the substrate by an applicator roller and arranged to permit the substrate to expand while still in contact with the applicator roller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.