Product containing high density skins
US4283450A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1978 |
| Grant date | Aug 11, 1981 |
| Priority date | — |
| Expiry date | Nov 19, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31982
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A fiberboard is manufactured having relatively high density skins on a relatively low density core by including urea in at least the surface fibers of a consolidated mat, having a density of less than 35 pounds per cubic foot, and then hot-pressing the consolidated mat at a temperature of at least 525.degree. F. to form a board having high density surface skins. In accordance with another embodiment of the present invention, urea is used to form a skin on higher density mats having a density of 35 pounds/ft..sup.3 or greater. The skin formed on the higher density mats has strength and density properties which are not as significantly different from the core material as is the skin formed over the low density core material of the first embodiment, but the skin on the higher density mats also improves the board strength, stiffness, paint holdout and design fidelity properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.