Method of molding shaped pulp articles from fiber pulp, and shaped pulp article
US5531864A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1994 |
| Grant date | Jul 2, 1996 |
| Priority date | — |
| Expiry date | Dec 21, 2014 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21J7/00
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A pulp molding die for molding shaped articles from fiber pulp is disclosed. The die has a porous molding layer having a porosity of at least 5% and an average pore diameter in a range of 60 to 1000 .mu.m, the porous molding layer having a molding surface shaped to the configuration of the article to be molded; and a porous support layer disposed adjacent the porous molding layer on the opposite side thereof from the molding surface, the porous support layer having a porosity of at least 20% and an average pore diameter in a range of 0.6 to 10 mm, the average pore diameter being larger than that of the porous molding layer. The porous molding layer and/or the porous support layer have a pore structure for holding water. A method of molding shaped pulp articles from fiber pulp, has the steps of: (1) providing a pulp molding die as above; (2) molding a pulp article on the molding surface of the die by suction through the die; (3) removing the molded pulp article from the die; and (4) after repeating steps (2) and (3 ) at least once, applying cleaning water to the die to incorporate water in the pore structure of the die and thereafter applying air pressure to the die from inside the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.