US1321956A

US1321956A - of karlstad

Info

Publication number: US1321956A
Authority: US
Publication date: 1919-11-18
Anticipated expiration: 1936-11-18

Description

R. E. WAGNER. ROTARY PRESSmG APPARATUS FOR WOOD PULP AND CELLULOSE.

- APPLICATION FILED MAYIB, I919.

Patented Nov. 18, 1919..

UNITED STATES PATENT OFFICE.

RUDOLFERNST WAGNER, 0F KARLSTAID, SWEDEN, ASSIGNOR 'lIO AKTIEBOLAGET KARLSTAIDS MEKANISKA VERKSTAD, OF KARLSTAD, SWEDEN, A COMPANY OF SWEDEN.

ROTARY PRESSING APPARATUS FOR WOOD-PULP AND CELLULOSE.

Specification of Letters Patent.

Patented Nov. 18, 1919.

Application filed May IG, 1919. Serial No. 297,659.

To all whom it may concern: I

Be it known that l, RUDOLF ERNST WAG- NER, a subject of the King of Sweden, residing at Karlstad, in the Kingdom of Sweden, have invented a new and useful Improvementl, in Rotary. Pressing Apparatus for Wood-Pulp and Cellulose, of which the following is a specification.

. In rotary pressing apparatus for woodpulpand cellulose the upper roller of a pair of rollers} has heretofore as a rule been placed slightly in front of the lower roller in the direction of movement of the sheet of material or pulp sheet, and said sheet has been introduced between the rollers in such manner that it has first been applied to the upper roller in an inclined direction from a ove, and has followed said upper roller to and past its lowest point, after which it has arrived to the pressing place between the rollers, and afterward leftv the rollers in approximately tangential direction from the pressing place, that is to say obliquely up- Ward. This arrangement entails a ver essential disadvantage, however, particularly in such pressing apparatus in which the upper roller is provided with slots, grooves, or the like in its surface, said disadvantage being that the water pressed out from the sheet of material by the upper roller and which accompanies said roller in its direction of rotation, flows back downward along the surface of the roller and forms a body of water on the upper surface of the sheet of material behind the upper roller, on account of which'th greater portion of said water will of course again be absorbed by the sheet of material and will accompany the sheet to the next pair of rollers where the course will repeat itself.

The present invention has for its purpose to obviate the said disadvantage, and it is broadly characterized by this that the upper roller provided with slots, grooves, or the like in its surface; is located in such manner beyond the vertical plane through the lower roller taken in the direction of movement of the sheet of material, and that the sheet of the rollers that the surface of the upper roller from the pressing place in the direction-of rotation of the roller extends downward toward the lowermost point of the perlphery of the roller and simultaneously diverges from the sheet of material. The stipulation that the upper roller is located beyond the vertical plane through the lower roller is oflcourse only to be so understood that the axis of the upper roller is located It might perhaps appear to be the simplest solution of the problem of avoiding bodies of water on the upper surface of the sheet of material, entirely to give up the use of an upper roller and a lower roller and insteadto use two rollers located on the same height, between which rollers the sheet of material is passed vertically from above downward, by which arrangement both rollers would be on a par with one another in respect of the possibility for an unchecked flowing off of the water. By practical tests, however, it has been established-that the flowing off of the water does not become more perfect in this manner than with the arrangement according to the present invention, in which the flowing off of water from the upper roller has proved to be quite equal to that from the lower roller. Furthermore, such arrangement of the rollers is not practically feasible in pressing apparatus for woodpulp and cellulose, owing to the fact that the placing of the rollers beside one another would'require a too large space, and above all, on account of the fact that the sheet of material when passed under tension between the pairs of rollers is not capable of enduring the sharp turns in. which in suchcase it must be passed from a point beneath a pair of rollers to a point above the next pair of rollers. For this reason and also on the ground that such rollers located on equal been arranged in heretofore used pressing apparatus. Fig. 2 is a diagrammatic view showing the arrangement of press rollers according to the present invention. Fig. 3 shows to a larger scale a pair of press rollers iaccording to the present invention, in see- As illustrated in Fig. 1 the upper roller has heretofore as a rule been located slightly in front of the lower roller in the direction of movement of the sheet of material 1, and said sheet has been applied to the upper roller 2 obliquely from above in order to effeet a kind of a pre-pressing of the sheet of material while said sheet bears against and accompanies the upper roller downward to and past its lowest point, after which said sheet encounters the lower roller 3 at the pressing place 4:. From said place the sheet has heretofore been passed from the pair of rollers in the direction of the common tangent through the pressing place, that is to say in a direction obliquely upward. In this manner the water pressed out by the upper roller at the pressing place, particularly when said roller is provided with slots, grooves, or the like in its surface, and which water accompanies the surface of said roller from the pressing place upward,

will afterward flow down and form a body of water at 5 on the upper surface of the sheet of material between said sheet and the upper roller, on account of which, as stated above, practically all of said water will again become absorbed by the sheet of ma terial.

In the embodiment of the present invention diagrammatically illustrated in Fig. 2 the upper roller 6 which is provided with peripheral slots, grooves, or the like in its surface, is located beyond the lower roller 7 in the direction of movement of the sheet of material or pulp sheet 8. The pulp sheet is preferably introduced between the rollers directly at the pressing place 9 in the direction of the common tangent, consequently in an inclined direction from above, and it is led away preferably in the same direction, that is to say obliquely downward from the rollers. In this manner the surface of the upper roller from the pressing place 9 in the direction of rotation of the roller will be directed downward toward the lowermost point 10 of the roller, as is more clearly shown in Fig. 3, and the surface of the roller between the

points

9 and 10 will diverge from the sheet of material and pass out of contact with the same. The water pressed out by the upper roller will be brought along in the slots 11 in the surface of said roller, until it has passed the lowermost point of the roller and afterward become lifted by the roller, when the water will flow off from the roller. In order to facilitate the flowing off of the water there may suitably be provided at a point on the portion of the surface of the roller moving upward a so-called scraper 12 with knives 13 or the like projecting into the slots 11 of the roller. In order to collect the water from the upper roller 6 and prevent it from flowing back to the pulp sheet there is provided a flute or trough 14 beneath the upper roller by means of which trough the water is led off toward the sides.

I'claim:

1. In a pressing apparatus for wood-pulp and cellulose, the combination of a lower roller, and an upper roller provided with circumferential slots in its surface and located beyond the vertical plane through said lower roll-er in the direction of movement of the sheet of material.

2. In a pressing apparatus for wood-pulp and cellulose, the combination of a lower roller, and an upper roller provided with circumferential slots in its surface and located beyond the vertical plane through said lower roller in the direction of movement of the sheet of material in such manner that the surface of said upper roller from the pressing place between the rollers in the direction of rotation extends downward toward the lowermost point of the periphery of said upper roller and simultaneously diverges from the tangent through the pressing place.

3. In a pressing apparatus for wood-pulp and cellulose, the combination of a lower roller, an upper roller provided with circumferential slots in its surface and located beyond the vertical plane through said lower roller in the direction of movement of the sheet of material, and a scraper bearing against the portion running upward of said upper roller.

4:. In a pressing apparatus for wood-pulp and cellulose, the combination of a lower roller, an upper roller provided with circumferential slots in its surface and located beyond the vertical plane through said lower roller in the direction of movement of the sheet of material, and a scraper bearing against the portion running upward of said upper roller and provided With knives projecting into the slots in said upper roller.

5. In a pressing apparatus for Wood-pulp and cellulose, the. combination of a lower roller, an upper roller provided With circumferential slots in its surface and located beyond the vertical plane through said lower roller in the direction of movement of the sheet of material, a scraper bearing 10 against the portion running upward of said upper roller and provided with knives projecting into the slots in said upper roller, and a trough beneath said upper roller.

BUD OLF ERNST WAGNER.