DE102005035557A1 - Smoothing arrangement for e.g. paper, cardboard or tissue has cooling device that can move away from flexible roller casing and is coupled to smoothing roller and/or bearing so as to move or pivot away from smoothing roller as it is lowered - Google Patents

Abstract

The arrangement has a smoothing roller (2) with a flexible roller casing (4), a heated cylindrical counter roller (3), a pressing element (5) with a concave pressing surface and a cooling device (6) extending along the edge of the flexible casing. The cooling device can move away from the flexible roller casing and is coupled to the smoothing roller and/or its bearing so as to move or pivot away from the smoothing roller as it is lowered.

Description

The The invention relates to a smoothing arrangement for Treatment of a paper, board, tissue or other fibrous web in an extended smoothing nip between a smoothing roll with flexible roll jacket and a heated, cylindrical and above it arranged mating roll, wherein the flexible roll shell of a Pressing element with concave pressing surface is pressed to the counter roll and the edge region of the flexible roll shell from one over a Part circumference of the smoothing roll extending cooling device chilled becomes.

such extended Glättspalte enable because of the longer Residence time in the smoothing nip one intensive yet volume-saving smoothing.

there will be the smoothing result significantly increased by the heating of the counter roll.

however it comes outside the fibrous web for contact between the hot counter roll and the flexible Roll shell of the smoothing roll. Since the flexible roll shell is usually made of plastic, this can Contact to thermal damages on the flexible roll jacket.

Therefore This edge area is often cooled.

Around a lowering, in particular a rapid lowering of the smoothing roll When opening of the smoothness gap to enable These cooling devices will be over the smoothing roll arranged. The thus made possible cooling is often not enough.

The The object of the invention is, therefore, the cooling of the flexible roll shell with as simple as possible Improve funds.

According to the invention was solved the task by that the cooling device via a extends lateral peripheral region, movable away from the roll shell stored and with the smoothing roller and / or their storage is coupled such that the cooling device when lowering the smoothing roller is moved away from this or swung away.

By This coupling will easily cause a collision of the smoothing roller with the cooling device at a lowering of the smoothing roll prevented. In this case, the peripheral region of the smoothing roll, which the cooling device covers, be chosen much larger than usual because of the movement of the cooling device.

in the Result will be through the longer cooling section also the cooling the edge region of the smoothing roll improved.

The cooling can be further enhanced by that on both sides of the smoothing roll preferably one cooling device each is arranged.

There Both edge regions of the roll shell by contact with the be called Counter roller thermally endangered If, even at both ends of the smoothing roll cooling devices should be present.

These inventive solution allows the cooling devices to have one Circumferential range of more than 90 °, preferably more than 120 °. In the interest of intensive cooling this should also be used.

Around the effect of the cooling device to maximize the flexible roll shell, the cooling device should in the non-lowered state of the smoothing roller over the corresponding peripheral area have approximately the same distance to the smoothing roll.

The Coupling between the cooling device and the smoothing roller can over a transmission or a corresponding control done.

Mechanically simple is the coupling between the cooling device and the smoothing roll however over at least one roller, a sliding shoe o. Ä. On the one hand and one with this Guiding element cooperating Backdrop or another guide on the other hand possible. Lowering the smoothing roller leads like this for moving away the cooling device from the smoothing roller.

there can the cooling device Total of the calender roll moved away or be swung away, the pivot axis preferably over the axis of the smoothing roller should be in the non-lowered state.

A inexpensive, yet sufficient cooling results when the cooling device nozzles having, in particular, air on the edge region of the flexible Align the roll mantle.

following the invention is based on an embodiment be explained in more detail. In the accompanying Drawing shows:

1 : a schematic cross-section through a smoothing arrangement,

2 : the smoothing arrangement with lowered smoothing roller 2 and

3 : a section from a side view according to 1 ,

For smoothing, the fibrous web 1 here led by an extended smoothing nip, which of a smoothing roll 2 with flexible roll jacket 4 and a cylindrical heated mating roll 3 is formed.

The flexible roll shell 4 consists of fiber-reinforced plastic and is made of a pressing element 5 with concave pressing surface to the counter roll 3 pressed.

there it can be a separate smoothing arrangement but it can also be part of a calender.

Because the flexible roll shell 4 outside the fibrous web 1 with the hot counter roll 3 comes in contact, the roll shell 4 at the two ends in each case two cooling devices 6 for cooling the edge regions of the roll mantle 4 assigned.

These cooling devices 6 have blowing nozzles, which air on the flexible roll shell 4 judge. In this case, the cooling devices extend 6 over a partial circumference of the roll shell 4 , Wherein the blowing nozzles in normal operation, ie when not lowered smoothing roll 2 , viewed over the peripheral area, the same distance to the roll shell 4 exhibit.

As in 1 to see are the two cooling facilities 6 the end of the calender roll 2 arranged laterally, over about 150 ° of the circumference, in each case within the two lateral quadrants of the smoothing roll 2 extend.

These relatively long cooling facilities 6 Of course, this also means long cooling sections and therefore also an increased cooling capacity.

For opening the calendering nip, for example in a demolition of the fibrous web 1 or at standstill, the smoothing roller 2 lowered, which is because of the hot counter-roller 3 and the associated thermal hazards should be done very quickly.

At this subsidence, a collision between the calender roll 2 and the cooling facilities 6 to avoid the cooling facilities 6 during the lowering according to 2 from the roll shell 4 the smoothing roller 2 pivoted away.

Here are the pivot bearings 7 the cooling equipment 6 above the axis of the smoothing roller 2 ,

The Wegeschwenken via a coupling between the cooling devices 6 and the calender roll 2 ,

To have the cooling facilities 6 like in the 2 and 3 to see one each over the end of the calender roll 2 protruding caster 8th whose axis is parallel to the axis of the smoothing roll 2 runs.

This roller 8th rests on one with the roll neck 10 the smoothing roller 2 connected leadership 9 from.

This guide 9 for the roller 8th is here exemplified as an oblique, flat rolling surface and ensures that the corresponding cooling device 6 when lowering the smoothing roller 2 is pivoted away from this.

The contact of the roller 8th with the leadership 9 is about the weight of the cooling device 6 guaranteed.

In the illustrated embodiment, the rolling surface extends over the roller 8th ,

Because the cooling facilities 6 can be pivoted away, can also change the roll shell 4 be made without restrictions by these.

Claims (9)

Smoothing arrangement for treating a paper, board, tissue or other fibrous web ( 1 ) in an extended nip between a smoothing roll ( 2 ) with flexible roll shell ( 4 ) and a heated, cylindrical and arranged over her mating roll ( 3 ), wherein the flexible roll shell ( 4 ) of a pressing element ( 5 ) with concave pressing surface to the counter roll ( 3 ) is pressed and the edge region of the flexible roll shell ( 4 ) from one over a partial circumference of the smoothing roll ( 2 ) extending cooling device ( 6 ) is cooled, characterized in that the cooling device ( 6 ) extends over a lateral peripheral region of the roll shell ( 4 ) wegbewegbar and with the smoothing roller ( 2 ) and / or their storage is coupled in such a way that the cooling device ( 6 ) when lowering the smoothing roller ( 2 ) is moved away from this or swung away. Smoothing arrangement according to claim 1, characterized in that on both sides of the smoothing roll ( 2 ) in front preferably one cooling device each ( 6 ) is arranged. Smoothing arrangement according to claim 1 or 2, characterized in that at both ends of the smoothing roll ( 2 ) Cooling devices ( 6 ) available. Smoothing arrangement according to one of the preceding claims, characterized in that the cooling devices ( 6 ) extend over a circumferential region of more than 90 °, preferably of more than 120 °. Smoothing arrangement according to one of the preceding claims, characterized in that the cooling device ( 6 ) in the non-lowered state of the smoothing roller ( 2 ) over the corresponding peripheral area about the same distance to the smoothing roll ( 2 ) Has. Smoothing arrangement according to one of the preceding claims, characterized in that the coupling between the cooling device ( 6 ) and the smoothing roll ( 2 ) via at least one roller ( 8th ), a sliding shoe o. Ä. On the one hand and a backdrop or another guide ( 9 ) on the other hand. Smoothing arrangement according to one of claims 1 to 5, characterized in that the coupling between the cooling device ( 6 ) and the smoothing roll ( 2 ) via a transmission. Smoothing arrangement according to one of the preceding claims, characterized in that the cooling device ( 6 ) Has blowing nozzles. Smoothing arrangement according to claim 8, characterized in that the blowing nozzles air to the edge region of the flexible roll shell ( 4 ) judge.