US1771559A - Web-forming apparatus - Google Patents

Description

July 29, `19?0.

S. DIESEN WEB FORMING APPARATUS .Filed Aug. 10. 1927 J'szm'me mdk/5 Patented J'ulyy 29, 1930 SVERRE DIESEN, OF OSLO, NORWAY WEB-FORMTNG APPARATUS Application filed August 10, 1927, Serial No. 212,062,

`Webforming apparatus for pulp, cellulose and the like have been suggested which consist of a rotatable drum covered by or formed with a screening filter and divided up in several cells, the upwardly moving surface of said drum forming wall in a pul container. Said cells, which are filled with air, are subjected to suction as their screening surfaces come into contact with the pulp in said container.

Such arrangement requires a very powerful suction pump, because the pump must remove the air from the cells before these can act with full power on the pulp, and of course such removal of air must take place within a reasonable, that is to say rather short time.

Further, as the suction starts from one end of the drum, where the suction pi is connected thereto, its action will not e evenly distributed along the length of the drum, and accordingly the pulp will not deposit evenly on the screening surface.

It is the object of the present invention to avoid said drawbacks in screens of the type indicated, and the result aimed at is achieved by the simple feature that said cells are filled or substantially filled with water before they enter into Contact with the pulp in the container.

The drawing illustrates by way of example one embodiment of an apparatus for carryin out the'new method. I he rotatable drum 1 is by means of longitudinal internal partitions 2 divided up l into a plurality of cells 3. Outwardly said cells are closed by some suitable screening material 4, such as wire cloth, slotted plate or the like. The cylinder 1 is as usual so situated in relation to a pulp container 5 that l part of the upwardly moving surface of the drum forms one wall of the said container.

At one end of the drum the cells 3 are in communication with a suction chamber 6, into which open conduits 7 and 8 connected to the suction ump and the waste water pump respectivy (not show n). t

Acco ing to the lnvention a container or pit 9 is provided below the drum l 1n such manner that when said pit is filled with Water the lower portion of the drum is submerged and from there,'as said, pre

and in Norway June 29, 1927.

in the water. The water level in the pit'may be kept constant by means of an over-flow 10, which may be adjustable. Water i's admitted to the pit 9 through a conduit 11, which preferably is in communication with the waste or discharge water pump, so that the waste water is used for filling of the cells of the drum. f

The apparatus works in the following manner: Prior to the start the pit 9 is filled with water from any suitable source, and then the drum is set into rotation.

When the drum rotates the cells submerge into the water inthe pit 9 and are filled with 65 water, and when they communicate with the container 5 the cells are at once subjected to .an even suction effect along the entire length n Because each cell which enters 1n to contact with* the container 5 is filled 70 wlth water, the suction pump may always work 'atthe same rate, and no extra force or energy 1s necessary to remove air from the cells. As the cells 3 pass past the container of each cell.

5 the water content of the cells is sucked into 75 I I the suction box 6, from where the suction pump takes the water throutgh the conduit 8,

erably to the pit 9 through the conduit 11. Thus, when once started, the apparatus works continually, S0. i

Without admission of fresh water to the pit 9. It is obvious that if desired fresh water may always be delivered to the pit 9 instead of waste water, and moreover other details of the construction here shown may be al- .tered without departing from the scope of the invention.

Having now particularly described and as- .certained the nature of my said invention and 1n what manner the same is to be performed, 90 I declare that what I claim is:

l. An apparatus for web-forming pulp including a rotatable drum subdivided into a plurality of cells, a pulp container arranged in such relation to the drum thatthe upwardly moving screening surface of the latter forms a wall in said container, and means for filling the cells with water prior to the screening surfacefthereof coming into contact with the pulp in said container. l

2. A11 apparatus as claimed in claim l, characterized in that said means includes a pit provided below the drum and means for delivering water to said pit to such level that the lower 'portion of the drum is submerged i.. the water in the pit.

In testimony whereo I aiix m signature.

v SVERRE IESEN.

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