US1631762A - Method and apparatus for mixing pulp - Google Patents

Description

1927. June 7 w. E. ROSEBUSH METHOD AND APPARATU FOR MIXING PULP Filed Aug. 5, 1924 Sheets-Sheet 1 IN VENTOR l llqwo E. FPOSEBUSH WITNESSES ATTORNEYS 4 Sheets-Sheet 2 W. E. ROSEBUSH METHOD AND APPARATUS FOR MIXING PULP Filed Aug. 5, 1924 R m. m V m W wo E. ROSEBUSH ATTORNEYS w m W. W

1,631,762 Ju 7, 1927- w, E. ROSEBUSH METHOD AND APPARATUS FOR MIXING PULP Filed Aug. 5, 1924 4 Sheets-Sheet 3 11v VENTOR M14100 E, ROSEBUSH g I I BY ATTORNEYS WITNESSES June 7 1927.

w. E. ROSEBUSH METHOD AND APPARATUS FOR MIXING PULP 4 Sheets-Sheet 4 Filed Aug. 5, 1924 lIllII/ll INVENTOR WITNESSES A TTORNE YS Patented June 7 1927.

UNITED STATES PATENT OFFICE.

"WALDO E. ROSEBUSH, OF MILLWOOD, WASHINGTON, ASSIGNOR TO INLAND EMPIRE PAPER COMPANY, OF MILLWOOD, WASHINGTON, A CORPORATION OF WASHINGTON.

METHOD AND APPARATUS FOR MIXING PULP.

Application filed August This invention relates to a semiliquid automatic mixing system for use in mills using 'a combination of wood pulp and sulphite pulp and has for an object to provide a construction wherein the pulps are automatically thoroughly mixed and kept in agitation until used.

Another object of the invention is to provide a mixing system in the nature of avery large beater wherein manual labor is reduced to a minimum while at the same time an extremely even product is produced.

A further object, more specifically, is to provide a mixing system wherein the stock is kept in a semi-liquid condition so that it can be handled into and out of storage and combined as required with but very little labor and only a small amount of attention by a workman.

In the accompanying drawings- Figure 1 is a schematic perspective view partly in section, illustrating one embodiment of the invention.

Figure 2 is a view showing in plan a storage tank, a number of deckers and associ ated members embodying certain features of the invention.

Figure 3 is a top plan view of certain troughs, screens and associated parts found in Figure 1.

Figure 4 is a top plan view of a pair of pumps and certain distributing pipes embodying certain features of the invention.

Figure 5 is an elevation of the structure shown in Figure 4 with certain other parts for better illustrating the relative position of the pipes and associated parts.

Figure 6 is a sectional view through Figure 5, approximately on line 66.

Figure 7 is a fragmentary sectional view of one of the circulators shown in Figure 1. Figure 8 is a fragmentary sectional view through Figure 1, approximately on line 8-8, the same being'on an enlarged scale.

Figure 9 is a fragmentary sectional view through Figure 1, approximately on line 99, the same being on an enlarged scale.

Figure 10 is a fragmentary sectional view through Figure 8, approximately on vline 10- 10.

In preparing pulp for making paper, as for instance, the ordinary news print paper now in common use, it is the practice to use approximately 80% of ground wood pulp and approximately of sulphite pulp.

1924. Serial No. 730,208.

Each variety of pulp must be prepared separately until it is in a proper condition for use and then mixed in about the proportion speclfied. During this mixing action, care is taken to eliminate all slivers or comparatively large articles so that a clean paper will result. Different methods have been used heretofore to maintain the pulp in a proper semi-liquid condition with varying success. According to the present construction and method, it is designed to use a mmlmum amount of manual labor While an extra even pulp is fed to the refining engine or Jordan, as it is called in the trade, and from thence to the paper machine. In the present construction, means have been provided for maintaining a continuous circulation of the pulps, both'before and after the same have been mixed, and particularly after the mixture of the two pulps, so that an exceptionally even quality of paper may be produced.

Referring to the accompanying drawings by numerals, 1 indicates a storage tank of any desired structure supported in any suitable manner at a desired height. This tank is associated with the sulphite ulp deckers and other parts, while a wood pulp pit 2 of any desired structure is provided-for sup plying the Wood pulp as needed to the various parts hereinafter fully described. The wood pulp and also the sulphite pulp are repared and screened before they are used y the construction. under consideration. In Figure 1, it will be noted that the device includes tanks 3, 3, 4 and 4', tanks 3 and 3 being connected and in effect presenting a single circulating tank, while tanks 4 and 4 likewise are connected together so asto present substantially a single circulating 95 tank for what may be termed the finished pulp, which pulp is ready to be discharged out the opening 5 for treatment by the refining engine and passage to the usual paper I machine. It will be understood that the re- 1 fining engine referred to and paper machine referred to are both well known.

The various tanks are rovided with a top or floor 6 and on to 0 this floor are provided, as shown in igure 1, two series of 105 devices 7 known as deckers. Associated with these deckers is a distributing trough 8, and associated with this distributing trough are preferably a large number of screenin devices 9, although only one is shown in ig- 0 ure 1. These screening devices may be of a desired kind but the particular screening deviceshown in Figure l is a Voith centrifugal screen. The function of this screen is for separatin the sawdust, large slivers and coarse fibers from the ground wood pulp in order to keep the paper as clean and free from specks as possible. Each of the deckers 7 is a machine old and well known in the art and consists briefly, (Figures 7 and 9), of a wire covered cylinder 13 immersed and rotating in a vat 14 filled with dilute pulp stock. Arranged above the wire covered cylinder is a small felt covered roller 15 called a couch which rides on or engages the cylinder and, as it rotates, picks up some of the pulp from the cylinder, the same being somewhat pressed by the operation so that the peeling blade 16, known as a doctor, may peel or shave the pulp from the felt covered roller, as indicated in Figure 9. As the pulp is peeled from the roller, it passes downwardly over the inclined surface 10 and through the opening 11 into the inclined passageway 12. The liquid, or what is commonly known as white water, passes into the interior of the cylinder and from thence out the ends into the respective troughs 17 (Figure 2) and through these troughs to the varlous discharge apertures 18 which open into the ducts 19, said ducts leading this liquid to any suitable discharge point. As indicated in Figure 2, there are used two rows of deckers 7 for treating the mixed wood and sulphite pulp, while there is preferably a single set of deckers 20 for treating the sulphite pulp alone.

In order to give a better understanding of the method of operation, as well as the various detailed structures, parts will be described along with the operation. It will be understood that screened sulphite pulp is provided from any suitable source and discharged into the respective openings 21 and 22 (Figures 1 and 2) and wood pulp is provided in pit 2 from any suitable source. A pipe 22 extends down into the pit 2 and by reason of any suitable form of pump 23, the wood pulp is pumped upwardly and discharged through the pipe 24 into the trough 25, which trough extends preferably almost entirely across the device as indicated in F lgure 3. The pump 23 is designed to maintain a certain level of the wood pulp in trough 25 so that the various screens 9 may be properly supplied with pulp through the auxiliary troughs 25. Any excess pulp pumped into the trough 25 will pass downwardly through the return overflow pipe 26 and be discharged into the pit 2. The pulp which is fed into the screens 9 will be thor oughly screened and discharged in a continuous stream into the troughs 8 and 27. The screened pulp will pass in trough 8 and the screenings will pass back in trough 27 and from thence through pipe 28 and back into a reclaiming system. The pulp passing into the trough 8 will flow into the two down chutes 29 and 30 and discharge into the horizontally positioned ducts 31 and 32. If too large a quantity is being discharged into the respective ducts 31 and 32, there will be an overflow through the aperture 33 (Figure 8) and this overflow will pass down through the passage-way 34 and from thence back to the pit 2. The pulp passing through the respective ducts 31 will pass therefrom through the various apertures 35 into the Various vats 14 of the respective deckers. However, before or at the time the wood pulp passes into the down chutes 29 and 30, sulphite pulp is supplied to the trough 8 so that it will mix with the wood pulp, and together with the wood pulp pass downwardly through the chutes 29 and 30 into the ducts 31 and 32. This is brought about by the fact that sulphite pulp is being furnished from any suitable source to the sulphite deckers 20', said pulp being discharged into these deckers through the openings 21 and 22. These deckers are similar to deckers-7. shown in Figures 1 and 9 and will, therefore, need no additional description.

As the parts operate, the deckers 20 will discharge a deckered pulp through the various openings 36 into the container or chamber 37'which is shown in the drawing as triangular. This deckered sulphite pulp 1s then pumped by the pump 38 through pipe 39 to the upper part of the tank 1.! It will be understood that there is installed a large pump on the ground floor below the tank 1 and the discharge of the pump is introduced between pipe 42 and valve 43 (Figure 1)to keep the deckered sulphite in the base of the tank continually in circulation even when the system otherwise may be shut down. A

pipe 40 is connected at one end to the pipe 39 with a suitable valve 41 interposed Whereby the pipes may be brought into communication or shut off as desired. A branch pipe 42 is connected to pipe 40 and to the tank 1, said branch pipe carrying a valve 43 Whereby this branch pipe may be shut off at any time. During the operation of the device, one of these valves is left open so that a continuous supply is provided through the pipe 40, preferably the valve 43 being left open so that the newly deckered sulphite pulp may bc-discharged into the top of tank 1 and thereby continuous circulation provided. The deckered sulphite pulp passing through pipe 40 will discharge into a box 44, which in turn discharges into troughs 45 and 46'(Figures 1 and 3). A dam 47 is provided at the end of trough 46, as indicated more'particularly in Figure 10, whereby only the overflow or excess pulp will pass into the trough 46 and from thence into the pipe 48 back into the container or chamber 37. A manually adjustable gate 49 is arranged between the box 44 and the trough 45 whereby any desired volume may be supplied to the trough 45 and the pulp thus supplied will pass through a pipe 50 and be discharged into the trough 8 so as to 1111K with the wood pul being discharged there in. This mixed pu p will then pass, as heretofore' described, downwardly through the down chutes 29 and 30 and from thence along the ducts 31 and 32 until discharged into the respective decker tanks 14. In Figure 9, it will be noted that each decker tank .is provided with a manually actuated gate 51, whereby any decker tank may be closed or, if necessary, all may be closed.

After the mixed pulp has been discharged into the various decker tanks 14 or, any number of these tanks, the pulp is deckered and the deckered pulp, which is now a mixture of sulphite pulp and wood pulp, is discharged into the inclined trough 12. By reason of the inclination of this trough, all of the deckered pulp discharged therein will automatically and under gravity flow in one direction, namely, to the lowest point of the trough. At this point, there is provided aipe 52 for each of the troughs 12, there Eeing, of ,cburse, one trough for each pair of tanks 3, 3 and 4, 4'. These pipes 52 discharge into pumps 53 and 54 and said pumps in turn pump the deckered pul through the respective p1pes 55 and 56 to t e upper part of the respective, tanks 3 and 4. A circu-.

lator 57 constructed as shown in Figure 7 is arranged near the ends of the respective tanks and connected as shown in Figure 7 so that the pulp may be pumped from tank 3 into the bottom of tank 3 while the same is true in respect to tanks 4 and 4. As the respective circulators 57 force the pulp into the same end of the tank 3 that the pipe 55 discharges into, the level of the pulp at this end of the tank will be raised and, consequently, the pulp will flow automatically toward the opposite end and will pass through the openings 58 and 58" respectively. The continuous action of the circulator 57 will cause a continuous circulation tained as a unit for stock preparation in.

i and of itself. This method of treatment of the two kinds of pulp results in providing a very uniform pulp, which will in turn produce a very umform paper, both in weight and quality. It will be observed that the action is automatic throughout and only a very smallamount of attention need be given to see that the various parts are functioning properly to turn on and oil? the various deckers as may be desired according to the volume of pulp to be provided.

What I claim is:

1. In a pulp mixing structure, a pair of tanks, means at one end for providing communication between the tanks, a circulating device arranged at the opposite end, said circulating device being formed to draw pulp from one tank and force it into the' other, a plurality of deckers for supplying deckered pulp to one of said tanks, and a plurality of means for supplying screened sulphite pulp and wood pulp to said deckers.

2. An apparatus for mixing wood pulp and sulphite pulp and maintaining the same in a semi-liquid condition with the pulp content evenly suspended, comprising a pair of circulating tanks, means for continuously discharging into one end of each of said tanks a supply of mixed sulphite pulp and wood pulp, and means for circulating the pulp in said tanks, said circulating means causing the pulp to continue to flow and thereby bemaintained in for instant use.

3. In an apparatus for mixing sulphite pulp and wood pulp and maintaining the same in a proper mixed condition, comprising a pair of parallel circulating tanks connected together at one end, a circulatin member connecting the o posite end, said circulating member inclu ing a screw conveyor adapted to draw material from one tank andforce the same into the other tank and at the same time produce a beating and mixing action whereby the mixed pulp is continually circulated and beat at one point in a circulation.

4. In an apparatus for mixin sulphite pulp and wood pulp and maintain a thor ough mixture thereof, comprising a pair of parallel tanks connected together at one end, means at the opposite end for connectihg said tanks together and for drawing pulp from one tank and forcing it into the other, and means for connecting a pulp supply to the last named end-of the tank into which the pulp is being" forced from the other tank. g

5. The method of preparing pulp for use in paper making machines, consisting in separately deckering sulphite pulp, then combining said deckered sulphite pul with screened 'wood pulp, and finally dec ering the mixture of the two pul s.

WALDO E. ItOSEBUSH.

proper condition

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