Übersetzung für "Siebsaugwalze" in Englisch

The suction couch roll 18 has at least two suction zones 18a and 18b.

The pulp is then thrown off at the egoutteur or dandy roller, so that efficient quality production becomes impossible.

After wire suction roll 30, fibrous material web 12 is carried along by lower wire belt 18 .

EvoFlow C suction couch rolls dewater the paper web via vacuum zones and increase its dry content.

The second wire then travels, together with the fibrous web that has been formed, over a suction couch roll where additional water removal takes place and then travels to the customary take-off point.

Another disadvantage of the known twin-wire former is that the separation of the two webs takes place already in front or upstream of the suction couch roll and therefore occurs at a place where the web of paper formed still has a relatively low content of solids.

Finally, the further removal of the water from the completely formed web of paper takes place in the end region of the twin-wire zone, namely at the suction couch roll.

Due to the very long wrapping zone of the suction couch roll, a substantially higher solids content of the web of paper can be obtained than with the known design.

The lower wire guides the web of paper over at least one additional suction box and over a suction couch roll to a take-off point.

This is due, on the one hand, to the fact that the forming roll is arranged directly, i.e. at a very small distance, behind or following the stationary support device and, on the other hand, to the fact that after the completion of the formation of the web, further removal of water takes place exclusively on the suction couch roll which is wrapped by the two wires.

It is particularly unfavorable that the twin-wire part is located above that part of the Fourdrinier unit in which the finally formed (but still moist) multi-ply fiber web runs, on the belt, in the direction toward the following treatment stations (e.g. wire suction roll, press section, etc.).

A web deflection after a respective drying section is preferably carried out by means of a respective wire suction roll, from which the respective outer wire belt, which is guided through the preceding drying section, is removed so that a shearing of the material web is prevented.

FIG. 1 shows the first drying cylinder 14 and a first wire suction roll 16 of a single-row cylinder drying group, for example, following the convection drier 10 .

After the last drying section 24, the wire belt 34 is given by way of the suction wire roll 40 to the first drying cylinder 14 of a single-row drying group.

After the deflection device F, the twin area, the end point of which is located at the roll S, such as a wire suction roll.

The two wires run from the right over the first wire suction roll SSW 1, on whose underside is positioned an applying device 44 that applies a medium to the underside of the paper web 38 .

The guide roll 19 can, however, also lie further towards the rear, so that the top wire is separated from the bottom wire 11 only at the wire suction roll 20.

The diameter of the suction couch roll, the wire wrap angle and the vacuum level in the suction zones determine the dewatering performance of EvoFlow C. The former is adapted to the respective machine application according to these criteria and accordingly optimized to the desired paper quality.

Using a full ceramic slotted impingement shoe cover design and a high vacuum suction box (HiVac) instead of a suction couch roll, the DuoFormer CBh ensures the highest dry content and lower maintenance costs compared to market standard solutions.

In a central area of the twin wire zone 5 the two wires 2, 3 together with the fiber web 4 which is forming between them, run over a multitude of additional dewatering and forming elements 10 . In an end area of the twin wire zone 5, viewed in direction of wire travel S (arrow), the two wires 2, 3 run over a separating element 11 which is in the embodiment of a suction couch roll 12, which separates the top wire 3 from the formed fiber web 4 and from the bottom wire 2 .

A flat suction box 23 and a suction couch roll 12 are located following the transfer suction box 22 . At a downstream pick-up roll 25 the fiber web 4 is taken from the bottom wire 2 by a felt 24 and is transferred to the subsequent manufacturing process.

In FIG. 4 a separating element 11 in the embodiment of a suction couch roll 12 is located downstream from the second forming suction box 15 . 2 as viewed in the direction of wire travel S. This separates the top wire 3 from the formed fiber web 4 and from the bottom wire 2 .

Particularly preferred is an embodiment in which a pre-press device 5 may include two rolls, i.e., roll 6 and one of rolls 7, 21, and 31, to roughen paper web 10 by pressing it against paper-production screen 13 by first press felt 11 . First press felt 11 may also be utilized as a pick-up felt, particularly when the two rolls are arranged following a screen suction roll 15 located in the paper-production screen loop.

Thereafter the double wire is forwarded to the second wire suction roll SSW 2, which is looped from the side of the lower wire, whereby a second applying device 46 is positioned on the side of the upper wire 39, which simultaneously applies a second medium to the surface of the web of material 38 .

The carrier fabric 2 is led over a fabric suction roll 19 having two suction zones 20, 21 at the end of the twin-wire section 4 .

This is adjacent to a screen-suction roller 14 that also incorporates a vacuum chamber that applies suction from the side of the lower screen 1 and on which the upper screen 3 is moved away from the paper web so that this then lies unrestrained on the lower screen 1, when it passes onto the other stations in the paper-making machine, namely, first to a press section and then to a drying section.

The multi-ply fiber web that is combined in this way to consist of the first and the second fiber plies is separated from the top wire 22 by a further suction separator 63 and thereafter runs further together with the belt 12, for example over a suction box 64 and a wire suction roll 65 (FIG. 1).