US1624049A - Wire netting for paper-making machines and method of making the same - Google Patents

Description

April 12,1921;

6. KURTz-HAHNLE ET AL WIRE NETTING FOR PABER MAKING MACHINES AND METHGD OF MAKING THE SAME Fil'd June-14. 1926 Patented Apr. 12,1927." I

UNITED STATES PATENT OFFICE.

CARL KURTZ-HAHNLE AND HA NS KURTZ OF REUTLINGEN, GERMANY.

Application filed June 14, 1926, Serial No. 116,008, and in Germany October 26, 1925.

Our invention relates to wire netting for paper making machines and method of making the same, these-called F ourdrinier wlres which are made of wire cloth; It is an objcct-of our invention to clin'linate the present excessive wear and short life in modern high-speed machines, and to this end we arrange the seam or seams of such Fourdrinler wires at an inclined angle to their longitudinal direction.

The excessive wear referred to occurs principally at the suction boxes. The faster the rate at which the machine is operated, the higher will be the vacuum in the suctlon boxes and as the Fourdrinier wire is intermediate between the vacuum chamber in the suction box and the Web, it will be drawn down to said boxes at a proportionate pressure. As at the same time it moves rapidly past said boxes, each chain thread will wear a groove into the covers of thesuction boxes. At the seam, the chain wires are not registering with the chain wires in the unbroken reaches of the F ourdrinier wire but assume intermediate positions so that at the seam the wire cloth is raised from the grooves it has worn and this may cause a jerk of such intensity that the web is frequently broken at the suction box. At the same time, the jerk causes wear to the seam and brings about an early failure of the Fourdrinier wire.

vention by arranging the seam not at right angles but at an inclined angle to the longitudina] extension of the wire so that it gradually moves across the suction box, starting at one end and thus avoiding the sudden jerk to which the usual Seam at right angles is submitted.

Seams at an inclined angle may be. obtained in various ways. The simplest solution is that of staggering both ends of the Fourdrinier wire for. the pitch of several Wires and removing the projecting edges. In comparatively long Fourdrinier wires, several seams are arranged in staggered relation as described so as to obtain the inclination which is desirable for the given case.

Another expedient is weaving the wire cloth on the loom in setting in gradually single chain wires, pairs or groups of chain wires so as to reduce the width of the cloth at one edge and increase in correspondingly atthe other. In this manner the Wire cloth These drawbacks are overcome in our inis distorted diagonally and has an inclined regulate the-motion of the wire as usually;

In the drawings, we have illustrated two modifications of Fourdrinier Wires embodying our invention.

Referring first to Fig. 1, a is an endless Fourdrinier ire and b is its inclined seam.

Referring now to Fi 2, this shows a Fourdrinier wire a" with chain wires 0 and seams d. It will appear from this figure that as many chain wires are eliminated on one side of the wire as have been added on the other.

\Ve claim:

1. As a new article of manufacture, a wire cloth or F ourdrinier wire for paper making machines comprising a seam extending at an inclined angle 0 the direction in which said wire is moving through the machine.

2. As a new article of manufacture, a wire cloth or F ourdrinier Wire for paper making machines comprising a plurality of seams extending at an inclined angle to the direction in which the wire is moving through the machine.

3. As a new article ofv manufacture, a wire cloth or Fourdrinier wire for paper making machines comprising ends staggered at the seam so that the seam becomes inclined to the direction in which said wire is moving through the machine.

4. As a new artlcle of manufacture, a wire 'cloth or Fourdrinier wire for paper making machines comprising chain wires addedon one slde of the wire and a corresponding number of chain wires withdrawn on its opposite side so that the seam becomes'in clined to the direction in which said wire is moving through the machine.

5. As a new article of manufacture a wire cloth or Fourdrimer wire for paper making 'machines comprisingchain Wires added on one side ofthe wire in groups of at least two wires each, and a corresponding number of groups Withdrawn on the, other side, so that the seam becomes inclined to the direction in which said wire is moving through the machine. v

6. A method of making wire cloth or Fourdrinier Wire for paper making machines consisting in staggering the ends of the Wire at the seam so as to obtain a seam inclined at an angle to the directionin Which the Wire cloth is moving through the machine.

7. A method of making Wire cloth or Fourdrinier Wire for paper making machines consisting in adding chain Wires on one side of the Wire and withdrawing a corresponding number of chain Wires on the opposite side so as to obtain a seam inclined at an angle to the direction in which the Wire cloth is moving through the machine.

CARL 'KUR'rz-HAHNLE. HANS KURTZ.

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