Multi-ply web forming apparatus and method
US4830709A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1987 |
| Grant date | May 16, 1989 |
| Priority date | — |
| Expiry date | Aug 24, 2007 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21F11/04
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A multi-ply paper web forming apparatus utilizes first and second forming wires which travel in a co-running path for a portion of their length and which form a throat into which an aqueous slurry of paper pulp fibers is introduced. The slurry is dewatered between the co-running first and second forming wires upwardly and downwardly to quickly produce a substantially formed, but still moist, top ply web which is carried on the second forming wire onto a base ply web which has previously been formed on the wire of a single wire former. The first surface of the top ply web is brought into ply bonding engagement with the surface of the base ply web to produce a composite multi-ply web which has superior overall ply bond, retention and dryness before leaving the web forming section of a papermaking machine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.