USRE11813E - Apparatus for separating and cleaning pulp for paper-making - Google Patents

Description

' No. man. A Bissued Mar. 20, I900.

- c. MICHAELIS I APPARATUS FOR SEPAIIATING AND-CLEANING PULP FUR PAPER MAKING.

3 Sheets-Shoat I.

IIIIIIII'MWIHINIIIIIMMMH flfllilllfl Illllllll mum! WNW WNW m lllflllll mm "mm mmmu .lllllllll mum mmmm nu ma I 7N2. vve'l'lbr I .,M%@ i No. n,a|3. N Beissued Mar. 20, I900.

r. c. MIBHAELIS. APPARATUS F08 SEPABATING AND CLEANING PULP FOR PAPER NAKING.

(Application filed Feb. 21, 1900.

3 Sheets-Sheet 3,

tition f and to pass into the second compartthe false. bottom a being supported on strips UNITED STATES FRED o. MICIIAELIS, 0F

PATENT. OFFICE;

nAL s'roN, NEW YORK.

APPARATUS'FOR SEPAR TING AND CLEANING PULP FOR PAPER-MAKING.

SPECIFICATION forming part of Reissued Letters Patent No. 11,813, dated March 20, 1900. Original No. 641,1'31, dated January 9, 1900. Application for reissue filed February 21, 1900. Serial No. 6,132.

To aZZ whom it may concern:

Be it known that I, FRED O. MICHAELIs, of Ballst'on Spa, county of Saratoga, and State of New York, have invented certain new and useful Improvements in Apparatus for Separating and Cleaning Pulp for Paper-Making, of which the following is a full, clear, and exact specification, reference being had to the accompanying drawings, wherein' Figure 1 is a plan view of my'improved apparatus; Fig. 2, a longitudinalsectional view on lines 2 2 indicated in Fig. 1, and Fig. 3 a cross-sectional view on lines 3 3 indicated in Fig: 1. I

Similar letters of reference indicate corresponding parts in all views of the drawings.

My invention consists of the hereinafterdescribed improvements in construction of apparatus for separating and cleaning pulp for paper-making, whereby the apparatus is rendered more efficient both in quantity and in quality of the work-performed and the costs of constructing and of operating such an apparatus greatly reduced.

The vat A of the apparatus is made, preferably, of timber in any suitable shape and; open on top. A part of its bottom is raised,

h and partition '5, respectively. In this manner a trough 0 is formed running alongside of one of the longitudinal walls of the vat. Approximatelyin the center of this longitudinal wall and on a level with the bottom of the trough o is an aperture c, connecting trough o-with stand-pipe d and culvert e. Standpipe at is divided by partition f intwo parts of approximately-equal areas. This partition wall f does not extendto the upper edge of pipe 01 to allow the liquid flowing from the vat A to overflow the upper edge of the parment of the standpipe d, communicating with the culvert e. There is an aperture f provided in the partition f. This aperture, located oppositely to the aperture 0, is normally closed by slide-valve g, which may be withdrawn for draining the vat A of its contents.

On each endof vat A a standard m is set, supporting bearing blocks Z, and in these is mounted shaft l, running longitudinally through vat A. On this shaft is mounted 'ceptacle for further treatment.

within the vat A the polygonal screeningcylinder B.

composed of screens 15, secured to'the end plates it and n and ribs 19 by screws 15, as shown in the drawings, or these screens may be slid in grooves provided for that purpose. Plate n is provided with aperture 70,- surrounded by flange M, and is supported by spokes it on hub u.

On one end of vat A, approximately in con ter of its front wall, is a flanged opening Z), the flange b projecting into the interior of the vat. This aperture corresponds in position, size, and shape with aperture 7.: of the polygonal cylinder 13. Flange n reaches closely to flange b, and the joint between the two flanges is covered by ring v of some durable and flexible material, preferably coarse felt.

Belt-pulley w is keyed on the rearwardlyprojecting end of shaft Z. A perforated water pipe y is run longitudinally through the vat in such position that the water escaping therefrom drips upon the polygonal-cylinder B, striking the screen-plates twhile the same are in sloping position.

A funnel or charging-spout as, GOI'lHGQlilll" the apparatus'with the stuff-chest or with the digester-tank, is placed in inclined position, so as todischarge in the interior of th vat A. Trough'z is set below aperture 71 and c nnec ts with it. This trough is so-situatedf that the strainedjpulp discharged from the cylinder B flows into it and is conveyed by it to a re- The stand pipe d serves also as means to prevent over- .fiow of the material Within the vat A-in case a greater quantity of material is accidentally discharged into the vat, as it sometimes happens. In such a case the surplus escapes This screeningcylinder B consists .of two (preferably octagonal) end plates n and containing the digested pulp, slivers, and

. knots flows from the digester through spout into the vat A. Belt-pulley w, driven by abelt, causes the shaft 1 and the polygonal cylinder B to rotate. The corners of the polygonal cylinder B being farther fromthe center of shaft d than its sides, the rotation of the cylinder B stirs up the liquid material filled in the vat A and keeps it' ina constantly-moving state. While the cylinder is thus rotated each of the screen-plates 15 comes successively in position to strike or abut against the liquid material filled in the vat, and-as there is at the same time a current of draft-air produced inside of the cylinder the :0

liquid and fineparti'cles of pulp'are driven through the screens into the interior of the cylinder and are discharged through aperture I into trough z, conveying the strained and separated pulp to a receptacle. While this process is goingon, the water dripping from the perforatedw'ater-pipe y upon that side of the cylinder B rising from the "liquid in the vat washes off all slivers and particles of material attached to the screens, thus pre venting clogging of the screens. The more coarse pulp and the undigested parts of. the material accumulate in the-trough o. In consequence of the peculiar arrangement of the bottom of the vat A the residue in trough 0 is not disturbed by rotating the cylinder B and is drawn off from time to time by opening slide g. The liquid carrying the coarser particles of pulp overflows partition f into the second compartment of the stand-pipe d and is conveyed through culvert e to another vat, where it may be drained and prepared.

for use as material for making wrappingpaper.

The advantages of my improved construction of the apparatus reside, first, in making the rotary cylinder polygonal audthei platess concave and setting them in position whereby at the same timewhile the appa ratns is in action the coarser particles of pulp which cannot pass through the screens are separated from the heavier impurities and from the not digested material accumulating in trougho, from where it may be withdrawn.

-The greater efficiency of the apparatus is explained. as follows: It will be observed thatv as the cylinder B rotates each side thereof forms, together with the two adjoining plates s, a pocket, which is absolutely empty at the time when that particular section of the cylinder enters into the pulp material in the vat.

. The liquid striving to restore its equilibrium facture of paper. I r

I claim as my invention and desire to sepresses through the perforated body of the cylindeiflaud this pressure graduallyincreases as each section descends toward the lowest point. From this point each section again commences to rise: and the strained liquid within the cylinder gradually recedes from the-side of the cylinder, thereby creating an empty space immediately adjoining the perforated body of the screening-cylinder. result of this is the same as explained, above. The liquid outside of the cylinder presses upon its perforated side and drives the fine particles of pulp through the perforations. The con'caved form of plates facilitates the receding of the liquid from the sides of the cylinder and eausesit to move toward the center of the straining-cylinder. In this manner these plates 3- neutralize the eifect of centrifugal force upon the liquid and facilitate its discharge from the straining-cylinder. These peculiar advantages of my im proved'constrnction'render it unnecessary to revolve the cylinder B with such greatspeed as the round cylinders of'such straining apparatus must be revolved, and owing to the greater force with which the pulp material isdriven through the screensv a much greater quantity. of the pulpmaterial is strained by using my im proved apparatus thancan be done in any other apparatus heretofore known.

The 1 A f u rther ad vantage of the several improvements in the construction of myapparatus rests in that it requires much less/power and much less time for performing the same amount of work as any heretofore-known apparatus of the same size.

The apparatus for separating and cleaning pulp heretofore used are provided with'mechanism for shaking the screens, because the round cylinder-screens operate very slowly and become easily clogged, or they must be driven at a very great speed and require great power to operate them. They are also rap.- idly ruined by wear. 'My improved apparatus does not require any shaking mechanism and runs without noise,easily, and smoothly. The

result of that is-tha't the apparatus is not per-- ceptibly effected by wear, and in making my experiments for the construction of the here- -inbefore;described apparatus I useddiscarded screens which no longer could be used in the pulp-straining apparatuses on account of their apertures being enlarged by wear, and

.I found that these discarded screens can still be used to good advantage in my'apparatus andperform thework satisfactorily. This shows that in my apparatus screens can be used having considerably wider apertures than those required in apparatuses heretofore known and that they last very much-longer. The diaphragm-screens which are mostly used in such pulp-separating apparatuses arevcry expensive and by extending the period of their utility great saving is effected in the manucure by Letters Patent-- ners thereof to a point approximately midway between the center and the peripheries of the end plates and of screens secured to the end plates and composing together with the end plates the body of the cylinder.

- 2. A cylinder for separating and cleaning of pulp for paper-making,consisting of ashaft, polygonal end plates mounted on the shaft, one of the end plates being provided with a flanged aperture located approximately in its center, of curved plates secured to theend plates and extending inwardly from the corners thereof to a point about midway between their centers and their peripheries, and of fiat screens secured to the peripheries of the end plates and forming the body of the cylinder.

3. A screening-cylinder for separating and cleaning of pulp for paper-making, consisting of a shaft, polygonal end platesmounted on the shaft and having correspondingly-curved flan ges'extendin g from the corners of the end plates to a point about midway between their centers and their peripheries, curved plates secured to the flanges, ribs secured to the corners of the end platesand extending from one end plate to the other, and flat screens secured to the end plates and to the ribs.

4. The combination with ascreening cylinder consisting of a shaft, polygonal end plates mounted on the shaft and of screens secured to the end plates and forming together with the end plates the body of the cylinder, of curved end plates set inthe cylinder and extending inwardly from the corners of the end plates to a point approximately midway between their centers and their peripheries.

5. An apparatus for separating and cleaning of pulp for paper-making, consisting of a vat, having an aperture approximately in center of one side tliereof,'suitahle standards, one on each end of the vat, a shaft passing longitudinally through the vat and mounted in bearings supported on the standards, a screening-cylinder mounted on the shaft within the vat and consisting of polygonal end plates secured to the shaft and provided with corresponding flanges extending between their centers and peripheries, curved plates secured to the flanges and extending from one end plate to the other, and of flat screens secured to the peripheries of the end. plates,

the screening-cylinder having a flanged aperture in its end plate, opposite the aperture in the vat, an inlet and an outlet trough conveying the pulp material into and from the apparatus, an outlet for discharge of the residue, and means for rotating the shaft.

6. An apparatus for separating and cleaning pulp for. paper-making, consisting of a vat, having an aperture approximately in center of one side thereof, suitable standards, one on each end of the vat, a shaft passing through the vat and mounted in bearings supported on the standards; a polygonal screen ing-cylinder secured to the shaft within the vat, and having an aperture in its end plate, opposite the aperture in the vat, curved plates set in the cylinder from each corner thereof to a point about midway between its center and periphery, a collar, covering the joint be= tween the edges-of the aperture of the cylinder and the aperture of the vat, a perforated water-pipe setin the vat above the screeningcylinder to one side of the-center thereof, an inlet and an outlet trough conveying the pulp material into and from the apparatus, an outlet for discharge of the residue, and means for rotating the shaft.

'7. An apparatus for separating and clean ing pulp for paper-making, consisting of a vat,.hav ing adischarge-aperture approximately in center of one end side and another aperture in the longitudinal wall thereof, a trough provided in the bottom of the vat and alongside of its perforated longitudinal wall, a ,stand-pipe adjoining the vat and communicating therewith through the aperture, a

partition-wall set in the stand-pipe extending from a point below its upper edge and down to its bottom, and provided with an aperture opposite the aperture in the wall of 4 the vat, a slide-valve closing the aperturein the partition-wall, a culvert communicating with the stand-pipe, a trough connecting with the discharge-aperture of the vat, a straining-cylin'der rotatably mounted in the vat, and having an aperture coinciding with the discharge-aperture of the vat, and means for rotating the cylinder in the vat.

In witness that I claim the improvements described in the foregoing specification I have signed my name the presence of two subscribing witnesses time o. MIGIIAELIS.

Witnesses:

THOMAS W. BROWN, JoHN W. REYNoLDs.

Images