EP 0032044 B1 19831109 - FORMING DRY LAID WEBS
Title (en)
FORMING DRY LAID WEBS
Publication
Application
Priority
- US 10614179 A 19791221
- US 10614379 A 19791221
- US 10614479 A 19791221
Abstract (en)
[origin: EP0032044A1] A method and apparatus for forming an air-laid web (60) of dry fibres suitable for use in a wide variety of products ranging from bath and facial tissues having basis weights on the order of 13 lbs./2880 ft.<2> to 18lbs./2880 ft.<2> to products having basis weights on the order of 19 lbs./2880 ft.<2> to 40 lbs./2880 ft.<2>, or even heavier, on a high-speed production basis, yet wherein the web produced, irrespective of basis weight, is characterised by random array of individualised fibres substantially undamaged by mechanical action and having a controlled cross-directional profile, and by its freedom from nits, pills, rice and the like, thereby improving both the appearance and the tensile strength of the web. The apparatus includes a 2-dimensional flow control and flbre screening system and a forming chamber (79) wherein a) substantially no cross-flow forces are created at the fibre feeding, screening and forming stages so as to ensure that the cross-directional profile of the web produced is controlled within desired limits and permitting formation of high-quality webs of virtually any desired width; b) the fibres are subjected to only minimal mechanical disintegrating action at all stages of the process subsequent to hammermilling, and, thus, shortening, curling and/or rolling of the fibres into pills, rice, or nits is minimized and, to the fullest extent possible, eliminated. Those pills, rice, nits and/or aggregated fibre masses present in the fibre stream fed to and/or through the flow control and fibre screening system are preferably centrifugally and tangentialiy seperated from individualised fibres and soft fibre flocs across the full width of the apparatus.
IPC 1-7
IPC 8 full level
D01G 25/00 (2006.01); D01G 99/00 (2010.01)
CPC (source: EP)
D01G 25/00 (2013.01); D01G 99/00 (2013.01)
Citation (examination)
- US 2931076 A 19600405 - CLARK JAMES D A
- US 2940134 A 19600614 - HERITAGE CLARK C
- US 4169699 A 19791002 - WERNER EDWARD E [US]
- FR 2346474 A1 19771028 - KROYER ST ANNES LTD KARL [GB]
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
EP 0032044 A1 19810715; EP 0032044 B1 19831109; AU 537637 B2 19840705; AU 6558280 A 19810625; DE 3065565 D1 19831215; MX 158498 A 19890208
DOCDB simple family (application)
EP 80304688 A 19801222; AU 6558280 A 19801219; DE 3065565 T 19801222; MX 18545481 A 19810105