US1748062A - Paper-making machine - Google Patents

Description

Feb. 25, 19,30. QOFRIN 1,748,062

' PAPER MAKING MACHINE Filed July 14/ 1927 2 Sheets-Sheet 1 Awfz'nE Uafn'n Feb. 25, 1930. A. E. COFRINH v PAPER MAKING MACHINE Filed July 14, 1927 2 Sheets-Sheet 2 LII 1 L hT 50 applied .to the machine,

Patented Feb. 25,-1930 UNITED STATES PATENT OFFICE AUSTIN E. COFRIN, F GREEK BAY, WISCONSIN PAPER-MAKING monmn Application filed July H, 1927. erial No. 205, 814.

The invention relates topapermaking machines of the Fourdrinier type and has as an object the provision of improved means to remove the water from the pulp upon the travelingwire.-

A further object of the invention is the provision of means to remove water from the pulp upon the wire with less disturbance of much higher rate ofspeed than those used at present, when making the same class of paper. i

. A further object of the invention is the provision of means of the character described whereby the action of centrifugal force upon water upon the surface of the tube'rolls tending to throw the water back through the wire with consequent disturbanceof the forming sheetupon the wire is avoided.

' A further object of the invention is the provision of a wire running at a speed such-as to introduce the element of centrifugal force if used with normal smooth surfaced tube rolls and the use with wire run at such speeds ofa tube roll which is of a foraminous charreferred to is avoided.

It is a further object of the invention to provide hollow tube rolls having perforated wire. A

Further objects will appear from the fol- 4 lowing description when read in connection with the accompanying drawingsshowing an illustrative embodiment of the invention, wherein Figure 1 is a diagrammatical side eleva tion, partly in section, showing the device acter wherebythe effect of centrifugal force gal force upon the forming sheet upon theother portions thereof,

Fig. 2 is a plan view diagrammatical in character,

Figs-3 and lare detail side elevations of modifications of roll and bar arrangements, and

Fig.'5 is a detail elevation partly broken away of one end of "a foraminous roll and its support. e

As shown, the machine embodies a Fourdrinier wire 10, a breast roll 11, couch rolls 12, and-1e, a slice bar '14, and an apron 15 of the usual type. Suction boxes 16 and 17 are also shown.

One form of the mechanism provided by the present invention is shown in general at 18 and comprises means for positively revolving some of the tube rolls at speed at variance with the speed of the Wire, also means for selectively placing into use the positively operated rolls or'the idle rolls, or a combination of the two.

I have found t hatthe usual tube rolls'of' the nature shown at 19, which are usually allowed to act asidlers in sup ort of the wire, being driven by friction with the wire in the same direction as the travel of the-wire, cause the water which travels with the wire, va a film upon its lower surface, to be forced'upwardly by centrifugal force through the Wire against the layer of stuff carried thereby, so

as to cause a disturbance ofithe' stuff and to I delayits felting action. v b y In the usual practice, the water is found to be removed from the wire after passage of the Wire over the tube roll under consideration rather than before the wire passes over the same, the surface friction of the water in'contact with the roll, and the motion of the roll in the direction of the travel of the wire, causing the action referred to.

In the usual practice referred to it was impossible to run the wire at high speeds since the action of centrifugal force to force the water carried by the smooth rolls up through the wire because at such speeds the formation of the sheet upon the wire was delayed and the resultant paper if run at such speeds would have a mushy character displaying when heldto the light portions thinner than or all of the tube rolls in the direction of the travel of the wire at a slower speed than the wire, or at a higher speed than the wire, or a positive revolution of the tube roll in a direction opposite to the travel of the wire. By the provision of the foraminous roll may be driven at a much higher rate of speed even though the rolls are not positively driven but act as idle rolls since the water coming through the wire upon the side of the roll in the direction of travel of the wire is not supported throughout the surface ofthe roll but much of the water, passes to the inproduct.

of theforming layer of pulp uponthe wire j is materially. avoided; also the water is re'-' moved from the wire with less disturbance, which renders possible an earlier formation of the paper, and if desired the use of a thicker solution of stock upon the wire, which renders possible theluse of a substantial increase in the speed of travel of the wire, and

at the same time providing an improved By virtue'of the same result it would be possible to use a shorter wire than has heretofore been necessary to complete the formation of the paper.

To accomplish the function described, some or all of the tube rolls may be positively driven. As shown, each third roll is provided with driving gears. The rolls 20, 21, and 22 are provided with bevel gears 23 in mesh with bevel gears 24, carried by a shaft 25, which shaft may be driven'in either direction by means not shown. i

To enable the selective operation of the driven rolls, or the idle rolls 19, each of the tube rolls shown is indicated as mounted upon an adjustable journal 26, which journals are supported in sockets 27 in supporting bars 28 by meansof thumb screws 29. By manipulation of the screws 29 the idle rolls-19 may be each lowered out of contact with the wire and the drivenrolls 20, 21, 22, brought into alignment and in contact with the wire, or the idle rolls may be brought into operation and-the driven rolls'may be lowered. If desired for any purpose, both sets of rolls may be operated at the same time. p

As shown in Fig. 3, means such as described in'my Patent No. 1,623,526, granted April 5, 1927, for removing water from the under side of the wire 10 have been combined with the positively driven rolls above demeans for bringing either or both into action at a particular time. As shown in Fig. 3, the bars for wiping off the water are shown at 30 mounted upon adjustable supports 26 which may be raised'or lowered by means" of screws 29. Therefore these bars may be used instead of the rolls 20, 21, 22, or in com- I .bination therewith.

shown in the present application, the wire The mounting of the bars 30 in Fig. 4 is similar to that in Fig. 3 but are alternated with Ordinary idling tube rolls l9.

A further improvement is shown in Fig, 5. It has been discovered thatany or all of the tube rolls provide unexpectedly good results .if made with the surfaces perforated. There is therefore shown in Fig. 5 a roll 31 formed hollow and having its surface supplied with numerousIperforations 32. When the positively driven rolls 20, 21, 22 are made as shown in Fig. 5, and driven so as to have a slippage between the roll and the wire 10,

maximum results in removing the water from.

the under side .of the wire are secured.

The speed at which the wire can be run I with rolls of the usual. smooth surface type acting as idlers in the formatiorf of tissue paper has been found to be substantially 300 to 400 feet per minute. By provision of foraminous'rolls of the present invention even when driven at the speed of the wire or caused to run at such speed by friction with the wire and not positively driven, it is found possible to run the wire ata much higher rate of speed, the possible speed depending to some extent upon the nature of the'paper which is being manufactured.

- Experiments already made seem to indicate that by the means disclosed a wire speed of 1000 feet per minute may be attained when makingtis'sue paper. I

Applicant is aware of paten'tto Bradbury No. 715,749 granted December '16, 1902 which was designed to allowwater to drain through v the roll upon the side of the roll which is ap preaching the wire but is not aware fthat this ,,roll was ever used with a wire running at the speeds now contemplated nor with wire running at aspeed which would introduce the bad efiects of centrifugal action from the sur-' faces ofthe rolls. B use of the invention above described, it is ound possible'to operate the wire at a substantial increase of speed and at the same time provide a superior product. This application is filed as a substitute for and a continuation in part of my application Serial No. 92,856, filed March 6, 1926. Minor changes may be made in the physical embodimentof the invention without departing from the spirit thereof within the scope of the appended claims.

' I claim i a 1. In a Fourdrinier' machine, in combination, a traveling wire, means to deliver pulp wire, and means to positively drive said tube" I wire,."and means to positively drive at least one-of said tube rolls in a direction and at a speed to increase the relative rate ofspeed of travel of the surfaces of the wire and roll..

2. In a Fourdrinier ma'chin'e in combination, a traveling Wire, means to deliver pulp to said wire, tube rolls coacting with said rolls in a direction and at 'aspeed to cause a slippage of the wire over the surface of the tube rolls.

3. In a Fourdrinier machine, in 'combina tion, a traveling Wire, means to deliver pulp "to said wire, tube rolls coa'ctingwith said wire, and means to positively drive at least one'of said rolls in a direction counter to that of the'travel of the wire.- I

' 4. In a'Fourdrinier machine, in combination, an idle tube roll, a positively driven tube roll, means to drive the latter to provide a slippage of the wire thereover, and means to selectively'place either of said rolls into operation. v a I 5. In a Fourdrinier machine, in combination, a Fourdrim'er wire,'tube rolls placedbeneath said wire, bars placed beneath said wire adjacent to said tube rolls, andmeans for bringing either or both said bars and said rolls, closely adjacent the under side of the Wire for removing water therefrom. 6. A Fourdrlmer'mac'hlne comprising in combination, a Fourdrinier wire, a tube roll closely adj acent'the underside thereof comprising a foraminous shell and means to positively drive said 011 in a direction andat a I rate of speed to provide slippage between the wire and the roll.

7. In a paper machine, a travelling carrier, table rolls for supporting the same, and

means for driving some of the said table'rolls at a difierent rate of travel than the rate of travel of said carrier.

In testimony whereof I affix' my signature;

' AUSTIN OOIJRIN. j a

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