B - Operations – Transporting – 29 – J
Patent
B - Operations, Transporting
29
J
19/3
B29J 5/00 (1980.01)
Patent
CA 1156814
ABSTRACT Methods, the products produced thereby, and apparatus for forming an air-laid web of dry fibers 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 18 lbs./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 characterized by a random array of individualized fibers 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. More specifically, methods, the products produced thereby, and apparatus for full-width feeding of fibers to a 2-dimensional flow control and fiber screening system and then through a forming chamber to a forming wire, wherein: a) substantially no cross- flow forces are created at the fiber feeding, screening and forming stages so as to insure 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 fibers 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 fibers into pills, rice, or nits is minimized and, to the full extent possible, eliminated; and c), those pills, rice, nits and/or aggregated fiber masses present in the fiber stream fed to and/or through the flow control and fiber screening system are centrifugally and tangentially separated from individualized fibers and soft fiber flocs across the full width of the system, and removed from the system while maintaining relatively low fiber separation and/or recycling on the order of less than 10% and, preferably, on the order of 1-5% by weight of the fibers fed into the system.
367268
Appel David W.
Chung Raymond
Kimberly-Clark Worldwide Inc.
Macrae & Co.
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