Selectively mechanically pre-dried paper and system for manufacture of same
CA 1061620 A · Owner: Crown Zellerbach Corporation · Inventors: Hamby, Horace (Iii); Hostetler, Ronald E.; Hulit, David D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A bulky, soft and absorbent creped paper web is manufactured by supporting an uncompacted wet web of principally lignocellulosic fibers on an imprinting fabric having compaction elements, the imprinting fabric has a surface void volume of from about 15 cc/m2 to about 250 cc/m2 and a compaction element contact area constituting from about 5% to about 50%, of the total surface of the imprinting fabric, the web is selectively mechanically pre-dried by passing the web through a compression nip formed between the imprinting fabric and a dewatering felt so that significant compacting of the web occurs in the vicinity of the compaction elements, whereafter the selectively mechanically pre-dried …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted September 4, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 4, 1996.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.