US1544904A - Paper-making machine - Google Patents

Description

Jufiy 7 g ggm gm M. F HERB PAPER MAKING MACHINE Filed July JA. 1923 Q o o MICHAEL F. HERB ATTOFZ NEYE5 Patented July 7, 1925.

UNITED STATES 1,544,904 PATENT ()FFICE.

MICHAEL F. HERB, OF NEW WESTMINSTER BRITISH COLUMBIA, CANADA.

PAPER-MAKING 'MACHINE.

Application filed July 14, 1923. Serial No. 651,532.

wire cloth from the head box to the couch rolls whereby the defect known as cloudiness in the paper is eliminated.

The invention consists essentially of a conveyor travelling over a plurality of rollers which are arranged to define a substantially level upper run, an intermediate run set to a graduated curve and a lower run of a regular decline, as will be more fully described in the following specification.

The drawing is a longitudinal section of my invention.

The numeral 1 indicates a head tank from which the'pulp stock is fed to the table and which is provided with a slice 2 which is adjustable vertically to provide an outlet I a 3 of any desired vertical depth at the front of the head tank.

The numeral 4 indicates an endless Wire cloth conveyor the upper run of which is caused to travel away from the head tank and passes around a bottom couch roll 5, which is suitably driven from any desired source, at the lower end of the run, returning over and under a plurality of idler rolls 6 and around a breast roll 7 the breast roll 7 is set under the slice 2 that the stock from the tank 1 discharges onto the upper run of the wire cloth 4 through the gap 3. '8 is an upper couch roll co-acting with the roll 5 and bearinguponthe wire cloth 4 at the outer end of its run. The numeral 9 is an idler roll supporting the cloth adjacent the couch roll 8. 10 indicates a plurality of freely rotatable rolls upon which the wire cloth is adapted to travel from the head tank towards the couch rolls. 11 indicates a plurality of suction boxes disposed transversely of the wire cloth 4 which are open at the top and are suitably connected to a pump or other device for extracting water from the paper as it passes thereover upon the wire cloth. That portion of the upper run of the wire cloth lying between the slice 2 and the lowermost suction box forms the table 12. The rolls 10 supporting the table 12 between the slice'2 and the point A are disposed to form a substantially horizontal bed, the rolls supporting the portion between the peints A and B are disposed to describe a parabolic curve, the greatest radius of which is adjacent the horizontal sect-ion, the rolls supporting the portion of the table extending between B and the suction boxes are disposed to form a constant downward slope.

The numeral 13 indicates a pair of flanged pulleys suitably mounted adjacent the sides of the table, .14 indicates a corresponding pair of pulleys mounted on opposite sides of the head box 1. 15 indicates a pair of 'deckel straps or rubber belts each of which pass around one of the pulleys 13 ,and' 14 and which on their outward run lie in close contact with the wire cloth 4 and form side borders thereto to confine the stock to a predetermined width. '16 are idler pulleys adapted to-support the slack of the retur run of the deckel straps 15.

The numeral 17 indicates the paper coming from the cloth between the couch rolls 5 and 8.

Having thus described the several parts of my invention I will now briefly describe its operation.

The pulp stock is fed onto the head tank 1 and maintained at a predetermined level with a view to providing a constantdischarge speed onto the table 12 through the gap 3 and to the point A of the table, the cloth 4 is adapted to run at a similar speed to the discharge speed of the stock. During the travel of the stock lengthwise of the table the. surplus water is allowed to pass rapidly by gravity through the meshof the cloth 4 so that the consistency of the stock is becoming proportionately less liquid, by the time the stock passes the point A- its momentum would become less if it were not for the increased decline of the table which by being graduated to a predetermined parabolic curve maintains the flow of the stock at a speed equal to the travel of the cloth, thus preventing the stock from either overrunning or underrunning the cloth and permitting the water to seep out through the cloth thereby causing the minute fibres of pulp to settle evenly upon the table. By

the time that the stock has reached the point B it has become semi-solid andthe fibres are no longer subject to displacement the paper in its run after passing, the point B to the couch rolls is subjected to drying by suction over the suction boxes.

It will thus be seen that I have invented a paper making machine which automatically causes the paper stock to settle to an even grain during its passage along the table resulting in a good grade of paper being produced with less difficulty than is usually encountered with machines now in common use.

Vhat I claim as my invention is:

1. In a paper making machine, a conveyor, means for supporting theupper run of the conveyor to form a table onto which paper stock is discharged, such table comprising a substantially horizontal upper portion. a sloping lower portion and an intermediate portion of appreciable length disposed at a graduated slope whereby the momentum weaaoa it conveyor onto which paper stock is discharged longitudinally, a table comprising a substantially horizontal upper portion, a

sloping lower portion and an intermediate I 1 portion defining a parabolic curve.

3. In a paper making machine having a conveyor onto which paper stock is discharged longitudinally. a table comprising a substantially horizontal upper portion, a sloping lower portion and an intermediate portion defining a parabolic curve the greatest radius of which is adjacent the upper portion of the table.

' Dated at New Westminster. B. (7., this 18th day of June, 1923.

MICHAEL F. HERB.

Witnesses HARRY M. Loan. ERNEST E. CARVER.

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