Forming non-woven fibrous material
AssigneeWiggins Teape Limited
InventorsBronislaw Radvan, Kieron Philip Green
Life of this patent
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Abstract
In a method of making non-woven fibrous material such as paper, the papermaking stock as it is being delivered to the foraminous support of a papermaking machine has air under pressure introduced into it to produce foaming of the stock and the stock is subjected to turbulence. This is effected by providing the head-box of the papermaking machine with a slice the body of which includes a slot through which the stock flows to the foraminous support and which is shaped to impart turbulence to the stock. The body also includes an air supply passage which communicates with the slot to introduce the pressurised air into the stock.
Claims17
A method of making non-woven fibrous material such as paper comprising the steps of:
- confining and directing a flow of stock through a slot toward a foraminous support;
- breaking up and dispersing fibre flocs by imparting turbulence to the confined flow in the slot;
- effecting foaming of the confined stock by introducing gas under pressure into the confined flow of stock in the slot;
- dispersing gas contained in the foamed stock as very small bubbles by imparting turbulence to the confined flow of foamed stock at a slot location downstream from the introduction of the gas;
- delivering the confined foamed stock having the broken up and dispersed fibre flocs and the dispersed very small bubbles from the slot onto the foraminous support;
- and
- draining the stock on the foraminous support.
A slice for the headbox of a papermaking machine, comprising:
- a body including a slot to confine and direct a flow of stock from a headbox chamber toward the papermaking wire of the machine;
- said slot being shaped to impart sufficient turbulence to the confined flow therein as to break up and disperse fibre flocs;
- a gas supply passage communicating with said slot and operable to introduce gas under pressure into the confined flow of stock in the slot so as to effect foaming of the confined stock;
- said slot being shaped, at a slot location downstream from the slot location communicating with said gas supply passage, to impart sufficient turbulence to the confined flow of foamed stock to disperse gas contained therein as very small bubbles.
Dependencies are inferred from the claim text.