Saturday, September 1, 2012

The Urwin, Jack Feedstock patent (1993)

Pub. No.:  WO/1994/028234  International Application No.:  PCT/GB1994/001103
Publication Date:08.12.1994International Filing Date:20.05.1994
Chapter 2 Demand Filed:  25.11.1994
IPC:
D21B 1/06 (2006.01)
Applicants:COURTAULDS FIBRES (HOLDINGS) LIMITED [GB/GB]; 50 George Street, London W1A 2BB (GB)
Inventors:URWIN, Philip, John; (GB).
JACK, Iain, Richard; (GB)
Agent:NEWBY, John, Ross; J.Y. & G.W. Johnson, Furnival House, 14-18 High Holborn, London WC1V 6DE (GB)
Priority Data:
08/067,43224.05.1993US
Title(EN) IMPROVEMENTS IN AND RELATING TO THE MANUFACTURE OF FEEDSTOCK FOR A PROCESSING OPERATION
(FR) AMELIORATIONS APPORTEES A LA CREATION D'UNE CHARGE UTILISEE DANS UNE OPERATION DE TRAITEMENT
Abstract:front page image
(EN)A method of making feedstock from material supplied in rolls of flexible sheet material which comprises the steps of creating a pluri-layer web of 'n' different layers of sheet material, each layer being selected with regard to some known parameter property of the sheet material whereby the pluri-layer web has an aggregate value of the selected parameter which lies within a chosen range of values of said parameter property. Conveniently the feedstock is created by disintegrating the pluri-layer web to create a mass of comminuted pieces of sheet material.


In the production of cellulosic fibres it is known to use as raw material wood pulp wound in stock rolls of sheet material, to break up the sheet material in a mechanical pulp mill and to convey the broken pieces of sheet material from the mill to a subsequent processing station. The subsequent processing can be critically dependent on the aggregate properties of the mass of broken pieces. This invention, in its different aspects, relates to a novel way of feeding individual layers of sheet material as a pluri-layer web of raw material capable, on comminution in the mill, of producing a mass of broken pieces of the required aggregate properties.
In the case of stock rolls of sheet-formed wood pulp, suppliers grade the sheet-formed material on a roll, inter alia, on the basis of the viscosity of a liquid product produced in a pre-determined manner from the wood pulp and supply the roll to the end user with a viscosity rating. The end user can then select from the range of stock rolls available those having viscosity ratings which he wishes to use for a particular feedstock material.
In accordance with this invention, prior to creating the feedstock material from a plurality of different stock rolls of selected viscosity rating, the sheet materials from a number of stock rolls are drawn together to create a pluri-layer web which is fed as such to a pulp mill for comminution to create the required feedstock material .

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