US2661666A

US2661666A - Apparatus for pulping papermaking material

Info

Publication number: US2661666A
Application number: US74031A
Authority: US
Inventors: William V Knoll
Original assignee: Individual
Current assignee: Individual
Priority date: 1949-02-01
Filing date: 1949-02-01
Publication date: 1953-12-08
Anticipated expiration: 1970-12-08

Description

Dec. 8, 1953 w. v. KNOLL 2,

APPARATUS FOR PULPING PAPERMAKING-MATERIAL I Filed Feb. 1, '1949 2 Sheets-Shat 1 32 FIG. I 33 34 1 3nventor WILLIAM V. KNOLL HIS Cittomeg D 8, 1953 w. v. KNOLL 2,661,666

APPARATUS FOR PULPING PAPERMAKING MATERIAL Filed Feb. 1, 1949 2 Sheets-Sheet 2 Smnentor WILLIAM V. KNOLL HI 5 (Ittorneg Patented Dec. 8, 1953 UNITED STATES P NT v. Knoll, Dana omo Afifihcatidii Fiirlii 1, 1949, Serial No.

4 Clainis.

fIhis invention relates to apparatiis for pulping and screening material used in the manufactureof paper. J 4. The primary object oithi's inyen'tionis 69pm; videan improved apparatus for pulping paper"- making material. c, Another o i-e 1 e1 p rov'isio'iicoi an im roved dfibering mefchanis'in for use in treating papermaking material 7 Still another (it oi the present invention is to provide, ari 1mproyd pulping machine haw ing' a cylindrical, Vessel or tank. with a cone. shaped bottom portio and a. beater or impeller mechanism which conforms to the cone sh 'pe' of the bottom of the t 1k a d is aa uve sman in peripheral imen i n regeneration at com paratively highppe'ri'p a1 vVelocity. 6 A I With these and in ital objects in View,,the invention includeseer inflnovel featl'i'rs of eonstruction andcombin' trons ofpa'rts, the essential elements of which are set forth in] appended claims n ie er lfio m r e b sliineni of which is hereinafter described with refrence to' the drawings which accompany and form a part of this specification.

In the drawings: v I Fig. 1 is a'fragme'ntary side elevation in pvertical section; showing a'batch type of apparatus embodying the present invention.

Fig. 2 is a fragmentary side elevation in vertical section of the bottom'portion of a contimi: ous type of apparatus embodying the present invention; V

Fig, 3 is a plan View; as observed. from above} of the apparatus shown in Figs; 1 and 2;

,jIhe; conventional types of apparatus" used at present fortreating paper-making material or stock are somewhat similar indesign and opera tion' and consist generally of a'cylindrical vesselior tank with a; rounded bottom portion 01'" perhaps; a sloping'bot'tom portion and a flat-disk type. of agitator or impeller-of comparatively large" diameter located near thehottoni of the tank. J

These relatively large disks obtain sufflcien't peripheral velocity, when driven at comparatively slow speeds, to'c'ause thepaper-making'stock to move in a'. horizontal direction away from the: periphery of said" disks and lipwardl'y' along" the sides of the vessels? Y r I n 4 Driving these largejhavy disks at slow' sfie'fll' necessitates the" use of e'il'l'fibersom'e 5116f iir'ien sive speedff I l the operating'ino at a oompalat'iv ,The, present. in 5 proved tyi vo'fplilping ratuscoz'npris a essel or taiilg with a conershaped vbottoifl and iirgiaene'r Whicheom f; of the tank andw I di" 16 h'gh rate of speed tolo am 1;,

to cause the paper outwardly. and 11 bottoi 'i 16 side either. 16 ciable c'na' undue resistance" Applicants i' pr oberates' at rel. W by direct belt; conne. 20' us el m n'atingithe mechanisms peed on nvfitional types of puniing apparat isl, i

The improved. ia'u a herein preferabl g d s. th 11 rom e '1 of this invention p i i f Referring whichlike'ief n the apparatuslofthi s v I lindrica l vesse q'r rank; lfl is'fibported b able legs" I I ma nevi-n an a "'ula' conical bottom port M a, centralnckiiQr w necl; i3: is covered vb l4, Siecni-d-tosaiiineck by a suitable an '6" piece; which encircles 40' i ne I v v secured 1161 6 511614115 i hearing housing I 5 supporting abiisfiiiigin whichv Y cdfiibars ape, Outer rice-i5 of which. co "forms in shape to the inner surface of @8653}? lation of material cal bottom 12. The angle of the conical bottom l2 and the agitator 24, as shown, is approximately 45 degrees, which is preferable but not imperative, as the angle of these parts may be changed somewhat in either direction without detracting from or interfering with the efficient operation of the apparatus.

The shaft I6 is enclosed in a tubular sleeve 9, secured at'its upper end to the bearing housing I! and having its lower end fitting freely in a collar secured to the hub 23. This sleeve protects the shaft Hi from the twisting and accumutherearound, which could conceivably interfere with the efficient operation of the device.

The disintegrating action of the agitator 24 is enhanced by a plurality of equally spaced radial vanes 26 (Fig. 1) fast on its outside face 25 and similar radial vanes 2'! fast on its inside face,

The

vanes

25 and 21 coact with corresponding vanes 28, equally spaced around the inside surface of the cone-shaped bottom I2 and located immediately above the upper rim of the agitator 24, to create the required turbulence and circulation of the paper-making stock to reduce it to the proper fineness for efficient paper making.

The lower end of the shaft i6 is rounded, as at 29, and said rounded surface coacts with a similar surface on a thrust piece 30, which fits freely in the lower bushing and provides means for adjusting the outer face 25 of the agitator 24 in relation to the inner face of the bottom portion l2 to secure the most efficient operation. A shoulder, formed by the reduced upper end of the shaft l6, coacts with an upper thrust collar 3|, secured to the upper bearing housing H, to limit the end play of the shaft l6.

Secured on the reduced upper end of the shaft 16 (Figs. 1 and 3) is a pulley 32, having a plurality of identical V grooves engaged by as many identical V belts 33, which engage similar grooves in a pulley 35, secured to the armature shaft 35 of a driving motor 36. The base of the motor 35 is secured to a plate 37, in turn secured to an extension of the channel member IS. A bracket 38 (Fig. l), secured between the plate 31 and the tank ll}, assists the channel IS in supporting the motor 36, and further support is provided by a vertical post 39, extending between said motor and the floor.

The multiple V-belt drive is chosen for its simplicity and its quiet and efficient operation; however, any other suitable means of driving the mechanism may be utilized with out departing from the scope and spirit of this invention.

The device shown in Fig. l is for so-called batch operation, in which the tank is loaded or charged and the paper-making material is treated until it is of the proper fineness and consistency for paper-making, whereupon it is drawn out of the tank through a discharge opening 45 in the neck [3, and the tank is again charged, and so on.

Fig. 2 shows the device of Fig. 1 adapted for either batch or continuous operation by providing suitable screening openings 40 in the agitator 24 and similar screening openings 4| in the angular bottom l2 of the tank In opposite the openings 40 in the agitator. A suitable circular chamber 42 is secured to the bottom of the tank I and surrounds the screening openings M in said tank. The chamber 42 has an outlet or discharge 43, which connects with, for example, a suitable storage place for the processed papermaking stock.

In the use of the device of Fig. 2 for continuous operation, as the paper-making material is reduced to proper fineness by the defibering action of the impeller 23, the

vanes

25, 21, and 28, and the conical bottom of the tank, said material passes through the screen openings 40 in the impeller 24, thence through the opposed screening opening 4| in the conical bottom of the tank into the chamber 42, and thence out the discharge 43.

Obviously the device of Fig. 2 may be used for batch operation, if desired, by simply closing the discharge 43, charging the tank with paper- .making material as explained in connection with Fig. 1, operating the impeller 43 until the material is reduced to proper fineness, and then drawing the processed material through the discharge 43, and so on.

It Will be noted that, in either the batch or the continuous type of apparatus, the agitator or impeller 24 forms a kind of vessel with angular sides, and in operation the paper-making material enters at the center of said vessel formed by said impeller and is immediately thrown violently outwardly and upwardly along the path of the cone-shaped bottom at a high velocity and without appreciably changing its direction or meeting with undue resistance. This efficient pulping action is obtained by the coneshaped tank bottom in cooperation with the impeller, which conforms in shape thereto, as-

sisted by the

vanes

23 and 21 on said impeller and the corresponding vanes 28 on the tank bottom. Also, the shape and size of the impeller permit it to be operated at a comparatively high initial speed, thus eliminating the use of cumbersome and ineficient speed-reducing apparatus.

While the forms of mechanism shown and described herein are admirably adapted to fulfill the objects primarily stated, it is to be understood that it is not intended to confine the invention to the forms or embodiments shown herein, for it is susceptible of embodiment in various other forms.

What is claimed is:

1. In a machine of the class described, constructed and arranged for the continuous pulping of paper-making material, the combination of a cylindrical pulping tank having an inverted frusto-conical bottom, and a circular chamber formed beneath the conical bottom and connected to the interior of said tank by screening openings in said conical bottom, said circular chamber having a discharge opening; a panshaped agitator constructed for high-speed rotation, said agitator comprising a flat bottom portion and an integral side wall portion tapered outwardly and upwardly to match the taper of the conical tank bottom and to form an opening that is'su bstantially larger than the flat bottom portion, said agitator being secured on the drive shaft in such a manner that the tapered side wall portion thereof is in closely spaced relationship to the conical tank bottom, said side wall portion having screening openings therein which are located opposite the similar openings in the conical tank bottom; radial vanes equally disposed on the inner and outer faces of the tapered side wall portion of the agitator; radial vanes equally disposed on the inner conical surface of the tank bottom immediately adjacent the upper edge of the tapered side wall portion of the agitator; and means connecting with the upper end of the shaft to drive said shaft and the agitator at comparatively high speed to cause said agitator, in conjunction with the vanes, to circulate the p-apermaking material outwardly and upwardly to create a vortex above said pan-shaped agitator to cause the papermaking material to be drawn downwardly into said pan-shaped agitator and recirculated thereby until it becomes of proper fineness to pass through the screening openings in the tapered side wall portion of said agitator and in the conical tank bottom, and enter the circular chamber where said paper-making material is continuously drawn out of the discharge opening.

2. In an apparatus for treating paper-making material, the combination of a cylindrical tank having an inverted conical bottom therein; a drive shaft mounted vertically in the center of the cylindrical tank; a pan-shaped agitator comprising a flat bottom portion and a side wall portion secured at its downward edge to said bottom portion and tapered outwardly toward its upper edge to match the taper of the inverted conical bottom of the tank to form an opening that is substantially larger than the flat bottom portion, said agitator being secured on the drive shaft in such a manner that the tapered side wall portion thereof is maintained in closely spaced relationship with said conical tank bottom; and means to drive the shaft and the panshaped agitator at relatively high speed to cause said agitator to circulate the paper-making material outwardly and upwardly to create a vortex above the pan-shaped agitator, which causes the heavier portions of the paper-making material to settle into said pan-shaped agitator, where it is recirculated until it becomes the proper texture and fineness for use in making paper.

3. In a machine of the class described, constructed and arranged for the continuous pulping of paper-making material, the combination of a cylindrical pulping tank having an inverted frusto-conical bottom and a circular chamber formed beneath said conical bottom and connected to the interior of the tank by screening openings in said conical bottom, said circular chamber having a discharge opening; a

pan-shaped agitator constructed and arranged for high-speed rotation, said agitator comprising a flat bottom portion and an integral side wall portion tapered outwardly and upwardly to match the taper of the conical tank bottom and r to form an opening that is substantially larger than said flat-bottom portion, said agitator being secured on the drive shaft in such a manner that the tapered side wall portion thereof is in closely spaced relationship with the frusto-conical 1y so as to create a vortex above said pan-shaped agitator, which in turn causes the pulping material to be drawn downwardly into said panshaped agitator where it is recirculated until it becomes of the proper fineness to pass through the screening openings in the side wall portion of said agitator and in the conical tank bottom,

and accumulate in the circular chamber where it is continuously drawn out the discharge openmg.

4. In a machine for treating paper-making material, the combination of a cylindrical tank having an inverted conical bottom therein; a shaft vertically mounted in the center of the tank; a pan-shaped agitator secured on the shaft near its lower end, said agitator being of lightweight construction for high-speed rotation, and comprising a flat closed bottom portion and an integral inverted conical side wall portion which conforms in shape to the conical bottom of the tank and is located in closely spaced relationship thereto, said agitator having a plurality of screening openings in the conical side wall portion thereof; and means operatively connected to the upper end of the shaft to drive the pan-shaped agitator at comparatively high speed to circulate the paper-making material and to cause said pan-shaped agitator to collect the circulating material as it settles in the quiet zone, near the center of the tank, and to throw said collected material outwardly and upwardly against the conical bottom of the tank to reduce said material to the proper fineness for use in making paper, which proper fineness is determined by the screening openings in the side wall of said agitator through which the properly reduced material passes.

WILLIAM V. KNOLL.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 118,092 Ames Aug. 15, 1871 166,519 Gardner Aug. 10, 1875 417,799 Walbaur Dec. 2, 1889 611,482 Katzenstein Sept. 27, 1898 1,219,290 Goyne et al Mar. 13, 1917 2,365,293 Robinson Dec. 19, 1944 2,371,837 Martindale Mar. 20, 1945 2,461,720 Cawood et al Feb. 15, 1949 FOREIGN PATENTS Number Country Date 12,096 Great Britain of 1898 OTHER REFERENCES Paper Making by the British Paper and Board Makers Association, 1110.; published by William Clowes and Sons, Ltd., London (1950); page 94.