DE2152959A1 - Paper machine - Google Patents

Description

ESCHER W Y S. S G.M.B.H., Ravensburg (Württbg.)

Paper machine

The invention concerns a paper machine with a uu'onden to-I sieve with a sheet-forming region in which aiii '(h, v one side of the screen from a suspension by Par.orablagerung a paper sheet is formed and on the other side of the screen liquid the suspension is separated from the suspension, with; one channels opening towards the oine side of the sieve in ^r 't; in the direction of the sieve successively:' for suspension and the other side of the sieve in around-! Door seal of the sieve on the downstream opening channels for liquid.

Πι.-1 known paper machines -./ird the suspension in the wire thrujh i'-ogen the SiGb in the direction of the sieve on each otherl'ol; ead opening channels z \\ r, ei c L tot. Accordingly, on i [- :: v r - '. rideren side of the sieve let Pliissigl ^ eit of the suspension through the direction of rotation of the sieve successive channels. By regulating the quantities of suspraaion or v / in the individual channels : 'μγ / ϊϊ W, ν. diu-jti regulate dor- niLttols of the other canals sucked out moles of! ■ 'IM ■ ;;! jkoit can affect the I-'cmer deposition on the sieve.

"The findun !!, ^1; is dLo object even weitergoh ^ r ι. To ER -V lusnung Mt Aru deposition of parsers are: M» οi

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possible. This object is achieved according to the invention in a paper machine of the type described at the outset achieves that at least one channel of the channels for suspension and / or of the channels for liquid »A channel leading away from the sieve or a channel leading to the sieve is a liquid.

Characterized thata sheet formation region, that is provided in the immediate vicinity of the sieve zones v / ground where ψ suspension is led away from the screen, can be achieved in the simplest nrt the desired direction and strength of the fiber deposition on the sieve. By providing zones in which on the side of the sieve facing away from the paper sheet no liquid is sucked off but rather liquid is supplied, the fibers already deposited on the sieve can be loosened up again.

ooll a preferred orientation of the fibers in the direction of rotation of the sieve, it is beneficial to keep the walls of the cannula in reciprocating vibrations of more to offset as BuO periods per minute. Advantageously "/ the direction of visual oscillation runs opposite the plane of the sieve at an angle of at least 20 degrees.

Control organs are advantageously provided for regulating the quantities of suspension or liquid flowing in the channels.

A very advantageous embodiment results when the channels for liquid are in a suction box, the viand carrying the sieve of which is convexly curved. Even in the zone

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of the liquid flowing towards the sieve, the sieve remains pressed against the box as a result of the sieve tension.

In the drawing, on the basis of which the invention is described in more detail, is an embodiment of the subject matter of the invention shown in simplified form. The single figure shows a vertical section running in the direction of rotation of the sieve through the sheet forming area of a paper machine.

Two wires i and 2 gradually converge in the sheet forming area to form a twin wire section. Between the sieves 1 and 2 there is a bath 3 of suspension, from which a sheet of paper is formed by fiber deposition on the sieves 1 and 2 on the sieves. Five lines with channels 4, 5, 6, 7 and 8 are immersed in the bath 3. The channels h, 5 and 6 open in the bath 3 in the immediate vicinity of the sieve 1, the opening points of the channels following one another in the direction of rotation of the -7 '~ bes. The channels 8, 7 »6 open in the immediate vicinity of the sieve 2, the opening points following one another in the direction of rotation of the sieve 2.

On the other side of the sieves 1 and 2 are suction boxes 11 and 11 or 10 and 12. The suction boxes 9 and 10 have channels 13, 15, 17, 19 and 1h, 16, 18, 20, respectively.

At the end of bath J5, i.e. just before the two sieves 1 and converge, there are foils 21 and 22, respectively.

Of the channels k to 8 for suspension, channels 5, 6, 7 serve to supply suspension, while channels 4 and suspension lead away from sieve i and 2, respectively. If desired, however, the channels 5 and 7 can also be used to carry the suspension away from the sieve.

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While the channels 13, 17, 19 and 14, 18, 20 of the suction boxes and 10 are used to suck liquid from the suspension, the channels 15 and 16 of the suction boxes 9 and 10 lead liquid to the sieves 1 and 2, respectively. This flow of liquid back into the bath 3 can, if desired, be repeated in channels following in the direction of rotation of the sieves 1 or 2, for example in channels IJ, 18, or in channels following in the direction of circulation of the sieves, for example in channels 19> 20.

For the channels 4 to 8, the channels 13 to 20, and the channels of the suction boxes 11 and 12, control elements (not shown) are provided for controlling the amount of suspension or liquid flowing in the channels.

In addition, the formation of the paper sheet can also be influenced in that the walls of the channels are set in reciprocating vibrations of more than 800 periods per minute. For this purpose, vibrators 23 are provided for the suction boxes 9, 10, 11 and 12. The vibrator for the walls of the channels 4 to 8 is not shown in the drawing.

The direction of vibration of the vibrators is indicated in the drawing by double arrows. The direction of oscillation of the walls that can be set in oscillation runs at an angle of at least 20 degrees with respect to the plane of the sieve 1 or 2, ie at an angle of about 50 degrees for the suction boxes 9 and 10 and at an angle of 11 and 12 for the suction boxes 30 degrees and for the V / an de of channels 4 to 8 at angles of 20 to 30 degrees.

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2152950

“Paper machine” and “paper” in the context of the application are also understood to mean a machine that is paper-like Sheet forms, for example a machine for the production of non-woven webs.

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Claims (4)

Claims Paper machine with a rotating wire with a sheet forming area in which on one side of the screen is formed from a suspension by fiber deposits and a sheet of paper on the other side of the sieve liquid of the suspension is sucked off, with channels opening against one side of the sieve for Suspension and successively opening against the other side of the screen in the direction of rotation of the screen Channels for liquid, characterized in that that of the channels (4 to 8) for suspension at least one channel is a suspension from Sieve (i, 2) channel (4, 8) leading away, and / or from the channels (11 to 20) for liquid at least one Channel is a channel (15, 16) leading to the sieve (1, 2). 2. Paper machine according to claim 1, characterized in that that the V / ands of the channels (up to 8 or 11 to 20) in back and forth oscillations can be shifted by more than 800 periods per minute. 3. Paper machine according to claim 2, characterized in that the direction of oscillation relative to the plane of the wire (i, 2) runs at an angle of at least 20 degrees. 4. Paper machine according to claim i, characterized in that that regulating organs are provided to regulate the in the channels (4 to 8 or 11 to 20) flowing amount of suspension or liquid. 209822 / 05S0 -7- 3. Paper machine according to claim 1, characterized in that that the liquid to the sieve (1, 2) leading channel (15, 16) in a suction box (9, 10) is, the sieve (1, 2) supporting wall is convexly curved. 209822/0560 Blank page