Apparatus and method for production of polyurethane carpet backing
US4278482A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1979 |
| Grant date | Jul 14, 1981 |
| Priority date | — |
| Expiry date | Jun 26, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24992
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A reactive polyurethane mixture is applied by a high pressure airless spray applicator directly onto the primary backing of a moving substrate such as a carpet web. The applied reactive mixture is allowed to foam to an approximate predetermined thickness and density. While the blown or foamed backing layer still possesses substantial residual tackiness, it is compressed or regauged to a precise uniform thickness and simultaneously is provided with either an embossed or a smooth surface. The tack of internal cell walls of the blown backing layer retains the layer at the regauged thickness. Curing of the regauged backing layer by externally applied heat and/or by the heat of the exothermic reaction in the applied mixture is completed. Detackifying agents are applied to the regauging devices and/or to the applied backing layer to prevent adherence of the layer to the regauging devices. A surface skin formed of the detackifying agents is cured on the regauged backing layer. The process achieves a great savings of energy and is fast and economical.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.