Multi-ply web forming method and apparatus and a multi-ply paper or board product formed hereby
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 29, 2002
Grant Date -
N/A
app pub date -
Apr 13, 2000
filing date -
Aug 19, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A multi-ply web forming method and apparatus are disclosed for forming a top ply onto a base ply. A fiber suspension jet is by means of a secondary headbox (21; 21', 26) delivered into a twin-wire roll nip created by two tensioned wires (16, 22; 16', 22'; 22, 27) one of which (16; 16', 22) carries the moist base ply. The web forming of the top ply is performed solely by means of roll forming (23, 23', 28) of the kind where the fiber suspension jet is delivered to said twin-wire nip at such a high speed to cause a yielding deflection of the outer of said two tensioned wires, while maintaining substantially constant tension during said deflection of the outer wire by guiding said wire on rotating supports (31a-c; 31a'-c'; 32a-c) at least one of which is resiliently or displaceably mounted to compensate for said deflection, wherein the speed of said fiber suspension yet delivered to said twin-wire nip is at least 300 m/min and the wire tension of the outer as well as the inner wire is at least 4 kN/m.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully