EP 0078406 B1 19861105 - METHOD AND APPARATUS FOR STOCK DEFLOCCULATION ON THE FOURDRINIER MACHINE WIRE
Title (en)
METHOD AND APPARATUS FOR STOCK DEFLOCCULATION ON THE FOURDRINIER MACHINE WIRE
Publication
Application
Priority
- US 30891981 A 19811005
- US 40465182 A 19820803
Abstract (en)
[origin: EP0078406A2] Paper stock is deflocculated on the machine wire by laying down a ridged layer of stock and phase-shifting the ridges without substantial dewatering. This phase shifting creates cross-machine direction (MCD) mass transfer of the stock and deflocculating CMD shear forces within it. Apparatus comprises a serrated slice or other means for delivering ridged-stock to the wire in combination with a series of foil blades beneath the machine wire adjacent to the headbox, each blade having a recessed land inclined first downward and then upward in the direction of machine motion and with substantially no dewatering of the stock on the wire until the stock reaches a location downward form the blades, causing water to be repeatedly drawn through the wire and directed upwardly by the inclined land, causing phase shifting of the ridges and hence CMD shear and significant deflocculation befor any web formation occurs.
IPC 1-7
IPC 8 full level
D21F 1/20 (2006.01)
CPC (source: EP)
D21F 1/20 (2013.01)
Designated contracting state (EPC)
AT CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0078406 A2 19830511; EP 0078406 A3 19841010; EP 0078406 B1 19861105; DE 3274132 D1 19861211
DOCDB simple family (application)
EP 82109117 A 19821002; DE 3274132 T 19821002