Post-press molding of man-made boards to produce contoured furniture parts
US4175105A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 1977 |
| Grant date | Nov 20, 1979 |
| Priority date | — |
| Expiry date | Jul 28, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/253
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method of molding a cellulosic fiber containing board at a temperature of at least 525.degree. F. to provide a relatively high density skin on at least one surface. A fibrous composition, including cellulosic fibers, is consolidated to form a blank having a density of less than 35 pounds/cubic foot. The blank is then cut to a shape larger in at least two of its three dimensions than corresponding dimensions of a mold cavity when said mold is in a closed position. Urea is then included in at least a surface layer of fibers of the blank in an amount of at least 5% based on the dry weight of the fibers contacted with urea, and thereafter the cut blank is molded to form a contoured product having a skin on at least one surface thereof, the skin defined by a thickness of material on said surface of said product having a density greater than the material on which the skin is formed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.