FI116733B - Soft calender - Google Patents

Description

Soft Calender

The invention relates to a soft calender having two sets of three, each forming two successive pe 5s calendering nipples with the rolls overlapping the groups.

Different calendars are used to increase the smoothness of the paper or cardboard surface. The calender may be housed inside a paper rolling machine (such as a pre-calender) 10 on the same production line (or on-line), or the calendering can be applied to the paper web as a separate off-line process in at least one calender nip forming soft roll. Most commonly, the nip is formed by means of a soft and hard surface roll, of which the Pehr 15 is usually a polymer coated and hard surface rolled metal roll, so-called. a thermo roll.

There are many different types of soft calendars from the application to the reciprocal processing of the paper web to be calendered, known as a calender having groups of two separate pairs of rolls in the calender body such that successive group rolls and hard metal rolls are in reverse order. '' Optigloss '' soft calender, in which the fish is arranged in series of two rolls of three rolls, each of which has a hard surface thermo roll and a mesh surface roll above and below it, resulting in a total of r. ···. rotate the soft roll nip through which the web can be passed si is reciprocally processed (both sides of the web <. la, in the first roll group in the first first web in the second roll group and the other side of the web).

• · • ♦ »* 2 on clearly shaped C-shaped frames. The Telojer is cranked in the machine direction by cranes from the front or rear of the chassis.

In 4-nip soft calendars, the top and bottom rollers are loaded in a 5-tab roll group against the center roll by attaching the upper 'bearing housings to the arms which are connected by loading cylinders to the machines, the forces transmitted from the bearing housings to the

It is an object of the invention to provide a two-by-three 10-volume 4-nip calender with a simpler frame structure. To accomplish this purpose, the calender viewer is characterized in that the roll housings are mounted on separate vertical housings, and at least in one of the vertical housings, the bearing housings are secured to each other such that the roll group ke: 15 roll bearing housings are secured to the : in the bearing housing of the roll, and that the middle roll surface of the roll group, preferably a heated thermal roll, whereby the soft roll nipples are formed between the soft surface roll and the hard pin.

j \: There is space between the separate vertical frames for different maintenance op €: accessories. When the roller bearing housings are attached to each other, there is little nipple pressure. 25 can be adjusted by adjusting the upper roll and lower roll casing of the roll group. Structurally, this can be accomplished by using a deflection compensator whose radial movement of the sheath is provided by the roll s as the upper roll and the lower roll of the bandage. . with load elements resting on a fixed shaft.

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Advantage of the Invention The old Optigloss-type soft calender 3

When the vertical frame of the calendar is, viewed from the side, the U mi with the center roll k mounted on it, the body becomes stiffer than the side k; machine - shaped body open, 5

The invention will now be described in more detail with reference to cartilage, in which Figure 1 shows the calender in a side view, 10 Figure 2 shows my fish according to another embodiment, and Figure 3 shows an alternative web export in the Figure 1i 15 calender.

Fig. 1 shows a calender according to the invention The calender has two A, B in a machine direction formed by three calender rolls in a row. Each roll group muc 20 a second calendering nip of a calendering stack having two calendering nips between the overlapping calendering rolls 1 in the running direction of the web, the second calendering element being heated by a so-called I V metal surface. The other calipers of the nipples: \ {25 inches of the soft ·: ·. · Rolls 1 on both sides of the center roll, which are usually coated with a polymer. These upper and lower rollers are also deflection compensators in which the movement of the roll shell is obtained on a stationary shaft i by means of internal loading elements of the roll which are adjustable.

• »1« · I 4 I prevents forces due to calendering I nip pressure being transmitted to the calender body. In practice, the caliper I is secured to the frame through its bearing housings 2 so that I is provided with fastening elements providing pre-tensioning force

I 5 secured by bolts 3 which are tightened by nuts 3a

The bearing housing 2 of the calender roller (thermo roll), and the bearing housings 2 of its upper and lower calender rollers 1 are also secured to the central bearing housing 2 by means of pre-tensioning elements I, such as bolts 4 which are tightened by nuts 4a.

I 10 I The bearing housing 2 of the middle roller is attached to the upper ends of the U-shaped arms I of the strut I on the vertical frame. The lower roller bearing housing 2 is housed within the pole I shape. The upper and lower roller bearings I 15 are mounted on the middle roller bearing housing to the upper I bearing housing 2 by means of common fastening elements I vertically of all three overlapping bearings} I There are two fastening elements, one on each side of the roller shafts. The fastening of the bearing housings 2 to the frame j1 20 in each of the two vertical frames R1, R2 is made up of long bolts 4 which are so-called. pin I, v; threaded rods with mute threads at each end: by tightening the roller bearing housings secured to another I · '] ·. nuts 4a of the threaded rod I \ \ 25 are against the upper bearing housing I * · the nuts 4a at the lower ends are against the lower plate)

I [/ Tightening joint fastening elements common to bearing housings U

I through the fastening elements of the upper bearing housing 2 and the lower bearing housing 2 sec I ·: ··: 30 bearing housings 2.

5 through the lantern nipple N to the other pillar of the sannah frame to enter the duct guide roll 6, thereafter through the spreading roll 5 through the center upper nip 1 between the center roll 1 and again to the half track duct 6, then guided by two track duct rollers 6, to the upper nipple N of the second roller group B, which, after the nip of the first calender roll 1 and the upper calender roll 1 v, the web W passes to the lower calender n and 1 of the roll caliper 1 and between the previous calender roller 1, and thereafter guided by two track guide rollers 6, A, B, from below, to the track guide roller '15 on the starting side of the track, out of the calender.

In this way, the web W can be calendered from both puc ways, since each side is in turn in contact with ke; To roll the web in one of two successive calendering nipples in the first 20 roll rolls A and below in the second roll. If you want to calender the web in just two nips size: X: · /: N of the second (lower) taper nip of 25 m B

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Each frame R1, R2 has a machine transverse direction '·· * through which the lowest calender roll can be moved wow laterally out of the calender after the roller replacement 2 has been removed by centering the bearing and lowering into the carriage 2 below the roller. The upper calender roller 1 can be replaced overhead by a crane when its bearing housing 2 has been removed from the center Kali bearing housing.

Fig. 2 shows a ka according to the second embodiment, two roller groups A and B having rolls similar to those in the I embodiment. The attachment of the rolls to each other and the vertical frames 10 is also similar. Here, however, the rolls are spaced apart with their bearing housings 2 so that the nip line of the calendering nipples is completely upright relative to the oblique position, i.e. the roll stack is oblique. The angle α between the vertical line and n is approximately 10 ° in Figure 2, but may vary. The upper and lower surfaces of the bearing housing 2 of the middle roller 1, which * and the bearing housings 2 of the lower roller are inclined, are inclined νε so that the roll stack is inclined, the bearing housings 2 of k roll 1 and lower roll 1 are secured. The inclination 20 of the roll stack nip line preferably deviates from the vertical by up to 15 °. The roller bearings of the middle thermal roller 1 do not reach the zero load range with the inclination.

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In Figure 2, the export of the web is such that it first passes through the upper nip N of roll group A. Reciprocal k.

to carry out the web W passes the first roll group A

»· Β ... φ from the bottom down and for the second roller group B from the bottom up

below the first roll group A and the second roll group B

Fig. 3 shows an embodiment in which the support groups 7 of the roll groups A, * nvpt nvsh / RiinrflsftA pH lapprinpftipn 9 are attached to the support structure in opposite directions of the calender roll, in different directions of the calender. Each l · calender roll bearing housing is secured to the corresponding U: r support structure.

5

The web exports can be modified by changing the position of the line wires on the reel rolls and by changing the drives on the calender rolls 1. Likewise, it will be apparent from the figures that in each of the rolls, it is possible to bypass the roll nip 10 in each roll group A, B to calender the paper web W in the two calendering nips instead of the four.

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Claims (5)

A soft calender having two sets of three rolls (each forming two successive soft calendars 5 (N) with the rolls (1) overlapping each other, the known silent groups (A, B) being disposed on separate vertical frames (R1, R2), in the vertical frame, the bearing housings (2) of the rolls (1) are secured such that the bearings of the middle roll (1) of the roll group (A) are secured to the vertical frame (R1, R2) and both rolls 10 and the lower roll (1) ) in the bearing housing (2) of the roll and that the center of the roll group (A, B) is a hard surface roll, preferably a heated thermal roll, whereby the calender nipples (N) are formed between the soft surface hard roll. A soft calender according to claim 1, characterized in that the center roller bearing housing (2) is mounted on a vertical frame. A soft calender according to claim 2, characterized by a bearing housing (2) of the middle roll being fixed to the upper ends of two successive posts: V. * «« I ♦ «4 *« · Soft calender according to claim 2 or 3, characterized in that the upright body is U-shaped in its side and forms the circumference of the bearing housing of the center roll (1) mounted on it. Ring ** :: / 30 according to any one of the preceding claims, characterized in that the upper and lower rollers I '*; ** (2) of the roll group are attached to the bearing housing (2 • · · ** »!! i of the middle roll