US 1434318 A
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Description (OCR text may contain errors)
D. H. SCHWARTZ.
PAPER MAKING MACHINE.
APPLICATION man APR. 16, I920- RENEWED MAY 13. 1922.
Patented 0st. 31, 11922.,
felt that is approaching the couch roll which idntented Get. 31, 31922. I
entree stares transit eareur @FFEQE.
DANIEL H. SCHWARTZ, 0F HOLYOKE, MASSACHUSETTS, ,ASSIGNUR T0 HOLYOKE VACUUM SLUICE COMPANY, 01E SPRINGFIELD, MASSACHUSETTS, A CORJPO- RATION 01E MASSACHUSETTS.
. PAPER-MAKING MACHINE. 7
Application filed April 16, 1920, Serial No. 374,376. Renewed may 13, 1922. Serial No. 560,715.
T 0 all whom it may concern Be it known that l, DANIEL H. SCHWARTZ, a citizen of the United States, and resident of Holyoke, in the county of Hampden and State of Massachusetts, have invented certain new and useful Improvements in Paper- Making Machines, of which the following is a specification. c
This invention relates to paper making machines and is shown more particularly applied to that class of machines in whlch a series of cylinder molds are employed in combination with properly arranged couch rolls to transfer the pulp in thin sheets or layers to the carrier felt or apron, the couch rolls acting to press or squeeze out the water from the pulp layer that is being transferred to the carrier felts.
Heretofore it has been customary to locate a slice bar in front of each couch roll to prevent the water squeezed out of the pulp by the couch roll, from back-flowing upon the is still carrying one or more layers deposited thereon by the preceding cylinder molds of the machine.
The present invention is intended to provide a means for taking up the water from in front of the couch roll as fast as it is squeezed'out and positively conduct ng it away'so as to avoid unnecessary wetting or saturation of the felt and the pulp at this point, comprises essentially in combination with the cylinder mold and the couch roll a conduit or trough arranged in contact with the felt somewhat in advance of the couch roll so as to remove the water therefrom and convey'it away in a. manner to avoid the saturating of the advancing felt and its layer of pulp. V
These and other features of the nvent on will be explained in detail 1n this speclfication and will be defined in the claims hereto annexed.
In the accom anying drawings I have 11- lustrated an e ective construct on and arrangement embodying the princlples of this invention in which: 3 I
Figure 1 is a plan view ofone end of a pulp machine, so muchthereof be ng shown as is necessary to an understanding of the present invention.
Figure 2 is a side elevation thereof. Figure 3 is a central section through the water-removing member the same being. shown on. enlarged scale.
Referring now to the drawings, the tank 0; having a series of concaved bottom vats a for holdlng the pulp is of the usual construction. In these separate vats are mounted a correspondlng serles of cylinder molds connected with a suction pump in the usual manner so as to create a suction through the reticulated peripheral wall of the cylinder molds 1n order to cause a thin layer of pulp to adhere to the circumference of. the revolving cyllndermold which layer of pulp is carried up into contact with the usual carrier felt d above which rests the usual couch roll 0 which has a finely perforated circumferentlal wall, and is rotatably supported in the free ends of the opposite pivotal arms 0 which hold it in position while allowing it to press the carrier felt down against the mterposedlayer of pulp that has been picked up and carried to the felt by each cylinder mold. The supporting arms 0 are mounted 1n any suitable upright or brackets e arranged on opposite sides of the machine.
As the carrier felt 03" travels along the machine in the direction indicated by the arrow, it picks up from each successive cylinder mold a thin layer of pulp which adheres to the under side of the carrier felt, the said aggregated layers being carried around a suction roll f at the end of the machine and along the top side of the carrier felt until the cohering layers are deposited at some other part ofthe machine for further treatment, all in accordance with the usual practice.
lit will be seen that as each layer of the combination layers of pulp'passes between successive cylinder molds and their cooperating couch rolls the latter perform their function of squeezing out the water from the pulp. When, according to the common practice heretofore, a slice bar is laid across the felt above the'top of the cylinder mold there must be a substantial accumulation of water in the longitudinal space between the slice bar and the couch roll which has to flow ed to the opposite ends of the cylinder mold which results in a substantial wetting of the felt and of its adhering layer of pulp as they approach the couch roll;
l have overcome this difierence by providing means for positively conducting away I the squeezed out water so as to preventits accumulation and the consequent separation of the pulp layer from the felt. To this end I provide a pipe or tubular conduit (1 Which of the .nozz
is provided with a longitudinal slot d"; on
one side and which has at one or both ends. an outlet 03? connected with an exhaustor suction pipe d through which sufficient suction is created by the action of a suitable.
pump not shown. To facilitate they draw d passed through transverse slots in the flan e d. p
T is liquid conduit or trough is supported in contact with the felt d slightly in ad? vance of the-couch roll by means of pivoted arms d'which are preferably provided with counter-weights d so as to secure the desired degree of, pressure of the nozzle member upon the carrier felt interposed between it and the top of the cylinder mold.
through The action of the deviceis as follows: A. partial .vacuum or suction is roduced the suction pipes d and t e slight quantity of free water that oozes out ofthe p ll ,in front of the couch roll is instantly ic ed up and carried off through the outet' pipe so that no accumulation of water is permitted at thi point. In consequence,
Y thereof, the. feltand its underlying felt thus leaving ompalatively" little f ee liquid in, the pulp, to. befsqueezed I out by the couch roll. I In consequence ofv revious ly deposed layers of pulp approach t e couch roll without any additional wetting or exposure to water which tends to impair the action of the couch 'roll'in expelling water from the pulp. The invention, therefore.
eep the felt in an unsaturated Ondition vvl'll lch facilitates. the-operation of the mac e.- I I v V .By dispqsing thesuction nozzle directly ainst the face of the felt the accumulation 0 liquid on the, carrier felt in advance .of
the couch roll is prevented both because such I arran ement wholly avoids} the possibility of any accumulation of liquid byreason-of the direct suction exerted oncthe surface of the felt, butfurthfilmore and betause it is found in practice thatsuch an arra. ement and dispositionof the suction nozz e acts to extract the liquid directly through the e by means. of clamping screwsv serves to ranged to-trav this arrangement the pulp is uniformly compacted and distributed and is generally free:
from blisters or air bubbles which are frequently found where any accumulation of liquid on the surface of the felt is permitted.
. What'I claim is:
. 1. Ina paper machine the combination of .a ulp carrying cylinder mold, a couch roll mounted to press against the said cylinder mold, a carrier felt arranged to travel betweenthe cylinder mold and the. couch roll. and'ito take up the pulp from said cylindermdd, a suction nozzle mounted in contact with the .felt in advance of the couch roll to draw off the liquid squeezed from the pulp to avoid saturation of the advancing felt, substantially as described.
.2. The combination of a pulp carryin cylinder imold a carrier felt, a. couch ro arranged 'topres's'the felt a .ainst the cylinder to squeeze theinterpose felt, a tubular conduit having a suction nozzle resting against the felt, and means for varying the width of the nozzle. opening, substantially as described.
3. In a paper machine the combination of the "Pulp carrying cy mold, cooper ating couch roll and carrier-felt,'an exhaust member arranged'in'front of the couch roll in contact with the feltfor conveying away the water from the felt, said exhaust. meme her being provided with an. elongate'd'nozr "zle extending parallel tothe couch .roll, and
an adjustable-plate for narrowing or widen:
ing the width of said elongated nozzle, sub
stantially as described.
4. In a paper. machine, the combination with ,a' pulp-carryin cylinder mold, a
couch roll, a carrier fe t interposed between the mold andflthe couch roll to travel between them, and a. liquid suction member located in front ofthe couch roll and arranged to extract the liquid from the felt approaching the couch roll thereby preventing an accumulation of liquid on the surface of t e car'- rier felt, substantiall as described. a
i 5 In-a. paper mac ine, the. combination of a-"cylinder ulp mold, a carrier .felt ar over and be pressed against the periphery of. said mold -alo" a :line where it is' covered with.-pu lp,1aho ow suction nozzle in contact with the/carrier felt alon the transverse line of contact between the elt and the. pulp covered mold, whereby a direct suction through. theT'felt is. exerted any accumulation 'of liquid onthe'jfeltfisub-f stantially .as described. '1-
6. In. a paper machine, the. combination of a revolving Pulp mold, a. carrier felt arranged to'trave in peripheral contact witlf to extract the fluid [therefrom andprevent the mold totransfer .the.. p1f1,.lp therefrom, a
suetiondevice having an-intalsenozzle arranged ndirect contact with that portion of the felt that is engaged with the pulp mold in order to extract the liquid from the felt, said nozzle having an intake that is variable as to width in order to vary the force of the suction applied to the felt, substantially as described.
7. A vacuum sluice for a paper making machine embracing in its construction an elongated tubular exhaust member provided with a longitudinally extending nozzle formed with a felt-engaging face adapted through said felt-engaging face to form 15 direct suction contact with the felt in order to. extract moisture and air directly from as described.
the felt, substantiall I have subscribed the In Witness whereo above specification.
DANIEL H. sciavvanrz.