US1267683A - Apparatus for washing or similarly treating pulp. - Google Patents

Description

S. MILNE.

APPARATUS Foa WASHING oPslMnARLY TREATING PuLP.

APPLICATIQN FILED DEC. 26. 1916- 1,267,683; Patented May 28,1918.v

3 SHEETSSHEET l.

In) VAA S. MILNE.

.APPARATUS FOR WASHING 0R SlNILARLY TREATING PULP.

APPLIcAloN -FILED Dsc. 26. 1916.

1,267,688. Patented. May 28,1918,

3 SHEETS-SHEET 2.

APPARATUS FOR WASHING 0R SIMILARLY TRETING PULP.

APPLICATION FILED Dsc. 2s. IsIs.

l ,267,683 Patented May`28, 1918".

3 SHEETS-SHEET 3.

SAMUEL MILNE, OF EDINBURGH, SCOTLAND.

APPARATUS FOR`WASHING OR SIMILARLY TREATIN G PULP.

Specification of yLetters Patent.

Patented May 28, 1918.

Application led December 26, 1916. Serial No. 138,985.

To all 'whom t may concern:

Be it known that I, SAMUEL MILNE, a subject of the King of Great Britain and Ireland, and resident of Edinburgh, Scotland, have invented certain new and useful Improvements in Apparatus for Washing or Similarly `Treating Pulp, of which the following is a specification.`

This invention relates to the washing of pulp and refers more particularly to the washing of pulp made from waste papers to insure the removal of printing ink and the like. It may also be used for washing pulp after digestion or after bleaching, and it is particularlysuitable for cleaning fibers which contain gritty or sedimentary matter. Printed papers, such as old newspapers and the like, are usually first reduced to pulp by any of the well known methods, such as by kneaders, potchers, beaters, ren'ers, or the like, in the presence of an alkali or other suitable compound which will combine with the oil in the ink. The pulping is carried out until the fibers are thoroughly separated and the particles of carbon loosened from them, so that they may be easily washed away without loss of fiber. Hitherto, the ink, loading, or other deleterious matter has been removed by the ordinary drum washers or concentrators, which work on the surface of the pulp, or by passing the pulp on an endless wire cloth under sprinklers or spray pipes, the sprays passing through the pulp and forcing the impurities through the wire cloth, or by treating the pulp in a rotating Wire-covered drum with spray pipes inside to force the impurities through.

In the course of my experiments I have found that when they pulp is spread on a Wire cloth, the impurities readily settle down, and as they are of a muddy character, they clog the meshes of the wire cloth, so that strong sprays of water, if applied above the pulp, are necessary to keep the wire cloth clean. These strong sprays cause a great loss of ber, a considerable proportion of the fiber being carried through the wire cloth by the force of the sprays.

I have found, however, that when the sprays are directed to the underside of the wire cloth the meshes are easily kept clear and the impurities readily pass through with much less loss of fiber than by any other method, and this application of the sprays to the opposite side of the wire cloth, to

keep the wire cloth clean and to lift the pulp slightly from it, forms the basis of this invention.

Several embodiments of the invention are illustrated on the accompanying drawings in which: A

Figure l is a side elevation of the preerred form of the invention in which the wire cloth receives a reciprocating horizontal movement. Fig. 2 is a part sectional plan view of Fig. l. Fig. 3 is an end elevation, and Figs. 4: and 5 are detail views of the cloth tray supports. Fig. 6 is an enlarged detail view showing the action of the spray.

The invention will now be described with reference to Figs. l to 5 of the accompanying drawings, in which wire cloth L is se cured to a frame b, which has sides c to confine the pulp and constituting bed or tray for the same. The frame b is provided with trunnions (Z at each corner to receive trunnion bearings in the form of sleeves c, which are formed with spherical bulbous parts 7 adapted to engage correspondingly shaped parts in the connecting rods g and be rigidly secured thereto by the bolts la Grooves are provided in the trunnions to accommodate studs L in the sleeves e to keep the parts in engagement. The lower ends of the rods g are similarly connected to loor brackets c', so that when assembled, the tray is capable of reciprocation in the longitudinal direction.

Below the frame b isya second frame A7', which is supported on the members 7c having cross-bars Z for the purpose. The ends of said cross-bars enter sleeve bearings fm, on the frame j, while a second set of cross bars n are provided on the frames 7c, the ends of which are adapted to engage further sleeve bearings o secured to the brackets z', the arrangement being such that this frame also is capable of reciprocation in the longitudinal direction. Carried on the frame 7' are a series of pipes p lying transversely of the tray a, said pipes being connected, by the flexible connections g, with the main supply pipe r, valves .s being interposed to control the supply to each pipe. The latter are perforated on the top side so that the water can gush forth in a series of jets on to the underside of the cloth tray a.

At one end of the tray a, housings are provided to receive two crank shafts t and u. The crank t is coupled by the connecting rod o to the tray a and is rotated by a belt and pulley from a suitable source of power QU. rllhe crank a is rotated by ineans oi gearing' from the same source of powen'but at a diderent rate of yspeed and said crank is coupled by the connecting rods m to the frame y'.

ln operation the pulp is led on to the tray cz and the water turned on to the sprinklers p. The cranks t, 'u are then rotated, causing the pulp and sprinkler :trames to reciprocate, the tray u, moving quickly so as to cause the pulp to gradually move along said ltray while the traine j nieves at a considerably lower rate of speed. By these means the water iinpinges on the underside of the wire cloth, on which the impurities from the pulp settle, and washes said impurities away whereby the meshes are easily kept clear.

The bracket i is provided with means to raise or lower the lower ends of the connecting rods so that the frames carrying the wire cloth may be raised or lowered at that end to regulate the thickness oi the pulp being treated, the washed pulp being discharged into a box, spout or cliest as may be convenient.

I wish it to be understood that the invention is not conned preciselyy to the einbodr ments shown ior carrying it into effect, as the details oi construction may be varied Without departing from the spirit of the invention.

llVhat l claim is:-

1. Apparatus Jfor treat-img` pulp coinprising, in combination, a pulp tray oi wire cloth7 a frame to support said tray, ineans to support said frame, a second :t 'aine mounted below the pulp tray, a series of sprinklers lmounted on said second frame, a luid conduit, connections between said conduit and the sprinklers, ine-ans lto recip-` rocate the pulp tray and nieans to alter the inclination of said frames to the horizontal plane, substantially as described.

nasa/,ess

E2. Apparatus for treating pulp comprisingyin combination, a pulp tray of wire cloth, a. frame to support said tray, connecting rods to support said traine, a second traine mounted on rocking members below theV pulp tray, a series of sprinklers mounted on said second frame, a fluid conduit, Aconnections between said conduits and the sprinklers, ineans to reciprocate the pulp ciprocate said frames together with gearing v to actuate said frames at different relative speeds, substantially as described.

e. Apparat-us for treating pulp, comprising, `in combination, a Vcloth tray, afranie with sides to support said tray a second frame below the tray, a series or' sprinklers on said second frame, a water conduit, flexible connections `between the conduit and the sprinklers. valves to control the iowoi the iiuid, rocking `members to supportr the frames, canksfand comiecting rods to reciprocate said raines together 4with means to vary the inclination oi the first Inentioned traine and the sprinkler franse .to the hert zent-al plane, substantially as described.

ln witness whereof l have hereunto set iny hand in the presence of two witnesses.

SAMUEL MlLNE.

lflfitnesses: f

FREDERICK Pis'rfr, Graines Wnlrnnaw.

@epilee es sans ne attained to? site cents eeen, addressing the seriennummer of regate, tuinplanten, E

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