EP0078406A2
Expired / Lapsed
EP
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Method and apparatus for stock deflocculation on the Fourdrinier machine wire
Assignee: MK Systems Inc
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Filing: 1982-10-02
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Granted: —
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Expires: 2002-10-02
Abstract
Abstract 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.
Inventors
- 👤 Otto J. Kallmes
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 05:42
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/18; D21F1/20
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
156 words
In a paper machine having a Fourdrinier wire and a headbox to feed stock to the machine wire, a forming board adjacent to the headbox prior to substantial dewatering of stock and having a plurality of blades transverse to the direction of machine motion, at least one blade with a downward step, said step being adapted to create vacuum beneath the moving machine wire, a rising land area following said downward step, said rising land area being angled upwardly toward the wire, whereby water at said land area is directed upwardly toward said wire, said blade and rising land area restricting water removal from the wire location, and means to deliver stock to said wire with longitudinal machine direction ridges, whereby stock in a layer having longitudinal ridges is placed on the machine wire and the ridges are phase shifted by moving water at the recessed areas formed by said downward step and rising land area.
Claim 2
Dependent Claim
156 words
In a paper machine having a Fourdrinier wire and a headbox to feed stock to the machine wire, a forming board adjacent to the headbox prior to substantial dewatering of stock and having a plurality of blades transverse to the direction of machine motion, at least one blade with a downward step, said step being adapted to create vacuum beneath the moving machine wire, a rising land area following said downward step, said rising land area being angled upwardly toward the wire, whereby water at said land area is directed upwardly toward said wire, said blade and rising land area restricting water removal from the wire location, and means to deliver stock to said wire with longitudinal machine direction ridges, whereby stock in a layer having longitudinal ridges is placed on the machine wire and the ridges are phase shifted by moving water at the recessed areas formed by said downward step and rising land area.
Claim 3
Dependent Claim
20 words
The apparatus of Claim 1, having a plurality of blades each with a downward step and a rising land area.
Claim 4
Independent Claim
24 words
The apparatus of Claim I wherein said means to deliver stock to said wire includes a serrated slice positioned to deliver stock to said.wire.
Claim 5
Dependent Claim
20 words
The apparatus of Claim 2, wherein said blades are positioned closely together to prevent substantial dewatering in the blade area.
Claim 6
Dependent Claim
138 words
In papermaking apparatus wherein stock is delivered from a headbox to the Fourdrinier wire of a paper machine adjacent to the headbox, the combination comprising means for delivering said stock in a layer having ridges along the direction of machine motion, a stepped surface adjacent to said headbox supporting and beneath the machine wire, said surface having a plurality of steps transverse to the direction of machine motion, longitudinal recesses located.at positions following each step and transverse to the direction of machine motion, said recesses being adapted to form partial vacuum beneath said wire to draw water from the stock into said recesses and to retain water therein, and base surfaces in said recesses rising in the direction of machine motion, whereby cross machine direction shear is created in the stock at the location of said ridged surface.
Claim 7
Dependent Claim
138 words
In papermaking apparatus wherein stock is delivered from a headbox to the Fourdrinier wire of a paper machine adjacent to the headbox, the combination comprising means for delivering said stock in a layer having ridges along the direction of machine motion, a stepped surface adjacent to said headbox supporting and beneath the machine wire, said surface having a plurality of steps transverse to the direction of machine motion, longitudinal recesses located.at positions following each step and transverse to the direction of machine motion, said recesses being adapted to form partial vacuum beneath said wire to draw water from the stock into said recesses and to retain water therein, and base surfaces in said recesses rising in the direction of machine motion, whereby cross machine direction shear is created in the stock at the location of said ridged surface.
Claim 8
Dependent Claim
16 words
The apparatus of Claim 5, wherein said ridged surface is substantially impermeable to water flow therethrough.
Claim 9
Dependent Claim
36 words
The apparatus of Claim 5, wherein said ridged surface has a plurality of narrow openings therein for passage of water in limited amounts sufficient to maintain surface cleanliness and insufficient for substantial dewatering of the stock.
Claim 10
Independent Claim
98 words
A method of deflocculating paper stock on a Fourdrinier machine wire comprising forming said stock in a layer having ridges longitudinal in the direction of machine motion, repeatedly drawing water through said wire immediately after delivery of stock thereto, retaining the withdrawn water beneath the wire and in contact with the wire, repeatedly directing the withdrawn water back to and through the wire prior to dewatering of the stock, whereby the longitudinal ridges in the layer of stock are repeatedly shifted in phase to reverse the ridges and the valleys between the ridges, and thereafter dewatering said stock.
Claim 11
Independent Claim
98 words
A method of deflocculating paper stock on a Fourdrinier machine wire comprising forming said stock in a layer having ridges longitudinal in the direction of machine motion, repeatedly drawing water through said wire immediately after delivery of stock thereto, retaining the withdrawn water beneath the wire and in contact with the wire, repeatedly directing the withdrawn water back to and through the wire prior to dewatering of the stock, whereby the longitudinal ridges in the layer of stock are repeatedly shifted in phase to reverse the ridges and the valleys between the ridges, and thereafter dewatering said stock.
Claim 12
Independent Claim
67 words
A method of deflocculating paper stock on the Fourdrinier wire comprising forming stock in a layer having ridges therein which ridges are longitudinal in the direction of machine motion, repeatedly drawing water through the wire and immediately returning water through the wire to the stock in the substantial absence of dewatering of the stock, whereby said ridges are repeatedly collapsed and formed again in displaced parallel positions.
Claim 13
Independent Claim
67 words
A method of deflocculating paper stock on the Fourdrinier wire comprising forming stock in a layer having ridges therein which ridges are longitudinal in the direction of machine motion, repeatedly drawing water through the wire and immediately returning water through the wire to the stock in the substantial absence of dewatering of the stock, whereby said ridges are repeatedly collapsed and formed again in displaced parallel positions.
References Cited (Backward Citations)
No citation records indexed.
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