US1905911A - Paper making apparatus - Google Patents

Description

I April 25, 1933. w KELLETT 1,905,911

PAPER MAKING APPARATUS Filed May 11, 1932 0 Q fzz/erzz or;

' Q wz-zzmmzzfnszzez & fyw W W Patented Apr. 25, 1933 UNIT-ED STATES PATENT OFFICE WILLTAM R. KELLETT, F MENASHA, WISCONSIN, ASSIGNOR TO PAPER PATENTS GOmANY, OF NEENAH, WISGONSIN, A CORPORATION OF WISGONSIN PAPER MAKING APPARATUS Application filed May 11,

This invention relates to paper making machines in which felts are used for picking up the web. Water is used as a shower for cleaning the felt or felts, which have be-' come quite saturated. If the felt or felts carry any considerable amount of water, part of this excess water will tend to go into the web and is difficult to remove; The

- speed ofkth'e machine is therefore limited by drying capacity due to the large amount of water which the felt itself carries. The web can be no drier than the felt which is carrying it, and every pound of water that can be removed from the felt represents a ing of the felt or felts at high spec s,-while still maintaining the use of adequate water, which not only keeps the felt or felts clean but gives longer running life because of the lubrication which excess water affords in contact with felt-carrying rolls.

Briefly stated, the present invention resides in the application of suction press rolls tothe felt in advance of the point of pick up of the web by the felt. The invention may be employed to advantage on either single felt or double felt machines.

In the accompanying drawing, in which the figure is-a diagrammatic side elevation, I have shown the invention applied to a Yankee paper making machine of the double felt type. 1

Referring to the drawing, 1 indicates a head box fromwhich the paper stock flows on the usual Fourdrinier forming wire 2. Said forming wire is trained around 'a breast roll 3 and a couch roll 41, passing over the usual table rolls 5 and suction boxes (not shown) if desired. The web is designated by 6.

An upper felt 7 is trained around an upper couch roll 8, a transfer roll 9 that delivers the web to the drying drum 10, and suitably placed guide rolls 11, 12, 13, 14, 15 and 16. It picks up the web at the nip of the couch rolls 4 and 8. A shower 17 applies a spray of cleaning water to the August 7 1928.

1932. Serial no. 610,545.

upper felt at a point between the transfer roll 9 and guide roll 11.

A lower felt 18 is trainedover suitably placed guide rolls 19, 20, 21, 22 and 23. It engages the web at the nip of suction press rolls 24:, between which latter the upper felt 7 and the web 6 also pass; the two felts,

with the web between them, passing thence over the guide roll 19, at which point the lower felt 18 leaves the. web. A shower 25 applies a spray of cleaning water to thelower felt at a 21 and 22.

The machine as thus far described, including the suction press rolls 24 located as described, is old and known. Suction presses, such as 241, have commonly been used to remove water from the felts and paper web simultaneously duringthe course point between the guide rolls of travel of the felts and web between the rolls, anexample of a suction roll being disclosed fill patent to Berry No. 1,679,598,

In the present invention, in order to remove excess water .from the felts injf addition to that removed from the felts and web by the suction'press rolls 24-,and before the felts, after cleaning, have contacted with the web, I employ similar suction presses on either or both of the felts. For example,

I have shown an upper pair ofv suction press rolls 26 through which the upper felt 7 is carried after it'has left the shower 17 and before it comesinto contact with the web at the nip of the couch rolls l'fand 8. And

I have also shown a lower painglof suction press rolls 27 through which the lower felt is carried after it has left the shower 25 and before it picks up the web at the nip 0f the suction press rolls 24.

The main advantages of these additional suction press rolls, located. and operatin substantially as described, are, that the we carries much less water when it is applied to the drier, and thus the machine may be. run'ata considerably greater speed, there is much less wear on the felts than where plain wringer rolls are used which require very high pressures and are less efficient in removing water, the life of the felts, is increased, and less water is required for clean ing where the water is drawn out .of the felts.

- Dirt is picked off the surface rather than forced into the intersticesof the belt.

The term pair of suction rolls wherever used in the above description, is obviously intended to include any pair of cooperating rolls in which only one of the rolls is equipped with suction devices. In this art such a pair of rolls is usually called a pair of suction rolls.

I claim:

1. In a paper-making machine, web forming means, web' drying 'means, a felt engaging the web between the forming means and the drying means, a felt washer, and a pair of suction pressure rolls engaged with said felt after the latter leaves said washer and before it makes contact with the web.

2. In combination with the web forming wire couch roll' and drying cylinder of a paper-making machine, a pick-up felt and means for conveying the web into contact with the drying cylinder, a felt washer, and a pair of suction pressure rolls engaged with said felt between said washer and the point 'of pick-up of'said felt with the web.

3. In combination with the web forming wire, drying cylinder, and-transfer roll of a paper making machine, an upper felt conveying the web from the forming wire to the transfer roll, a lower felt and means for guiding the same into contact with the under side of the web between" the forming wire and the transfer roll, washers for said felts respectively, and two pairs of suction pressure rolls respectively engaged f'with said felts at points between said washers and the points of pick up of said felts with said Web.

4. In combination with the "web forming wire, drying cylinder, and transfer roll of a paper making machine, an upper felt conveying the web from the forming wire to the transfer roll, a lower felt and means for guiding the same into contact with the said web.

under side of the web between the forming wire and the transfer roll, a pair of suction pressure rolls through which said felts with the web between them pass, washers for said felts'respectively, and two pairs of suction pressure rolls respectively engaged with said felts at points between said washers and the points of pick-up of said felts with WILLIAM R. KELLETT.

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