FI117295B - multi-roll calender - Google Patents

Description

117295

The invention relates to a multi-roll calender according to the preamble of claim 1.

In the prior art single roll multi roll roll calendars, there has been no method of providing a separate roll / roll mat independent of the rest of the roll with sufficiently high line loads. As is known in the art, this has been attempted by over-dimensioning the calender intermediate rolls, which has been able to raise the line load for matte grades (hard / soft nipple) but not enough. Due to the oversizing of the intermediate rolls, the cost of the rolls in the deliveries has increased due to the larger diameters and thus, in the prior art type 15 multi roll calendars, it has not been possible to track the matte nip.

It is an object of the invention to provide a solution to the above shortcomings.

• m A: The prior art is known as a multi-roll calender, consisting of two separate rolls ··: *** 20 in which the rolls are stacked on top of each other. The second roller is generally a roller formed by a plurality, usually at least three rollers, and the second roller generally comprises at least two rollers, preferably two spare rolls. One such arrangement is disclosed in F1 Utility Model Registration 4460, which describes a * * ***** calendar with at least two separate calender rolls housed in the same frame. In addition, the calendar has a plurality of paths for calendering paper to guide the web so that at least one group can be skipped. One group is at least a five-roll calender roll and one is a group of * • • · · * · "is a group of single roll pairs and the upper and lower rolls of said at least five-roll calender stack are similar deflection compensated rolls. •. ♦ 30 and similar to a pair of rollers.

• * · • ♦ • · · 117295 2

It is an object of the invention to provide a multi-roll calender that provides a more versatile dual-roll multi-roll calender, such as a calender of the type described above, so that it can run various variations.

It is also an object of the invention to provide a multi-roll calender suitable for use with both re-build calendars and new calender investments.

In order to achieve the above and later objects, the multi-roll calender according to the invention is essentially characterized by what is stated in the characterizing part of claim 1.

According to the basic idea of the invention, a multi-roll calender consisting of two separate rolls may first be provided with a multi-roll roll 15 as a single roll and a second roll with a spare roll of at least two, preferably two or three rolls. According to the invention, a calendering method and arrangement of the type described above is made cost effective so that by utilizing spare rolls it is possible to arrange a separate matte nip to the first roll and * from: a second roll to a first roll; :: can be used for different species. Thus, the invention enables a cost-effective solution ♦ ψ * ··· 'for, for example, matte grades, since the calender intermediate rolls do not need to be oversized * * * · **! for partial nipples. The invention enables the modernization of a matt multi-roll • • * ··· * loudspeaker into a cost-effective dual roll, in various variations. 25 calender. The invention also achieves a high capacity of the calender with alternative track extensions. In the invention, it is possible to bypass the tracks or to replace the tracks at the same time with an unused track.

The multi-roll calender according to the invention comprises two calender bodies 30 joined together, or a single frame allowing two rollers to be placed therein. Thus, the calender also comprises two rollers. The first calender 117295 3 gos initially has calender spare rolls, preferably two or three rolls of the first calender roll, for example two spare rolls forming a mat, or for example two spare rolls and one spare roll. The first body is provided with a removably attached snack adapted to cover any locations of the intermediate rolls missing from the roll stack 5 in the first roll. The second frame or portion of the second roll of the frame and the roll is formed such that the lower and the top roll of the roll are preferably identical deflection compensated rolls and the calender roll stack intermediate rolls comprise hard rolls, preferably thermal rolls and at least one soft surface roll between them.

10

According to the invention, when converting a calender to a two-roll multi roll roll calender, in which several different species can be run, one intermediate is removed from the second roll in the main direction of web travel, for example another intermediate roll, while lowering the top roll (s). When lowering the upper 15a / upper rolls, a snack can be inserted into the body in the space above it / between the frame and the upper roller. The intermediate roll (s) to be removed from the second track may be moved to the first track and additional new rolls may be mounted as needed. After the change, when the first bogie rolls • · for continuous production use, the original spare rolls form the actual # #; ** · 20 rolls, in which case additional caliper rolls must be purchased for the calender if necessary.

The invention will now be described in more detail with reference to the figures in the accompanying drawings, which, however, are not to be construed in any way as limiting.

Fig. 1 shows a multi-roll calender and Fig. 2 shows the calendars of the calender according to Fig. 1 in one embodiment of the invention.

Fig. 1 shows a calender 10 comprising two interconnected fish blade body members 1,2 which support the calender rolls. In the main running direction of web W 117295 4, the first frame portion 1 carries the first roller 3 of the calender 10 and the second roller 4 of the second frame portion 2. In the rolls 3,4, the calender rolls are stacked on top of each other. The first track 1 has two soft-surface calender rolls 5,6, 5 preferably with a polymer coating, preferably a spare roll forming a calender nip N1 between them. In addition to the spare rolls 5, 6, the first roller 3 may have other spare rolls, preferably e.g. one hard metal roll, e.g. a thermal roll (not shown). The second track 4 has six calender rolls which form between them five calendering nips N2, N3, N4, N5 and N6.

10

Of the calender rolls of the second calender roll 4, the top roll (top roll) 9Y is a deflection compensated roll whose rotary jacket shape is controlled by loading members on the inside of the jacket which are supported by a fixed shaft. The roll has a soft surface, e.g. polymer-coated. The lower roll 9A (lowest roll) of the second calender roll 4 is a soft-surface deflection compensated roll similar to the upper roll 9Y. The central rollers 7,8 between the upper and lower rollers 9Y, 9A are common calender rollers mounted on their rotating supports. Some of the center rolls 7.8 are of soft-spin, e.g., polymer-coated rolls 8, and some of the hard metal smooth rolls of * * V 7. The four center rolls of the roll 4 have 7.8 top and bottom calender rolls 7 • f ί * ·· 20 hard metal roll, preferably heated so-called. a thermo roll. The center rolls 8 ^ * * "· are soft-surface rolls, e.g., polymer-coated, which form a * * * * * · .. * so-called pivoting nip N4, where the calendering side of the web W is reversed. above, the web W is calendered so that the web W is on one side of a smooth hard heated roll in the nipples N2, N3 formed by a hard and soft roll, and below that the opposite side of the web is a smooth hard heated roll. against the roll in respective nipples N5, N6.

* · * · • »· * m% m *. *: Figure 1 further illustrates various options for introducing web W through calender 10 * ♦ · • # * ··· *. According to the first alternative I, the web W is introduced into the second calender 9 9, ψΙψ '· 30, bypassing the first caliper 3 and calendering in nips * ** N2, N3, N4, N5 and N6. In this situation, the calender is used as a multi-roll calender 5 117295, i.e. it performs multi-nip calendering. According to the second alternative II, the web W is guided to the first roller 3 and calendered in the nip N1. Thereafter, the web W is guided to pass beneath the second roller 4. In this situation, the calender is used as a mat calender.

5

As shown in Figure 2, the first roller 3 of the calender 10 is converted to a three roller, two of which are preferably calender spare rolls 5,6 and a spacer roller 7,8 moved from the second roller 4, preferably an upper soft-coated center 8 or placed 4 out of 10 other tracks 4 intermediate roll (s). A spare thermal roll may also be moved from the track 4 to the first track 3, leaving a soft-coated roll (not shown). If necessary, the intermediate rolls 7,8 of the second roller 4 may be moved to the first roller 3 as needed after the snack 11 shown in the representation of Fig. 1 has been removed from the first body part 1. Fig. 2 shows a preferred web export.

The second roller 4 now has five rolls 9Y, 9A, 7, 8 and the previously uppermost roll 9Y has been lowered, as well as a roller 7 below it and a snack (not shown) between the top roll: V: 9Y and the roll body Z.

s' \. 20

According to the invention, the starting position may also be such that in the main web moving direction, the first roller has three rollers, spare rolls for the application of Figure 1 and one spare roll, the delivery including e.g. 2 »f *: .. 2 spare deflection compensated rollers.

25

The invention has been described above only with reference to some examples of its application, however, the details of the invention are not to be construed in any way narrowly.

• * «• ·« * • 4 4 4 4 4 4 »I» 4 4 • · 4 4 4

Claims (6)

A multiple roll calender (10) comprising a die formed by two interconnected body parts (1,2) or by a single frame, in which the frame is placed two roll sets (3,4), in which roll sets (3) 4) the calender rolls are placed in stacks, wherein the multiple roll calender (10) comprises the first roll set (3) in the main running direction of the web (W) at least two rolls, advantageously two or three rolls (5,6), and the second roll set (4). ) in the main running direction of the web (W), at least three calender rolls, characterized in that an intermediate roll (s) (7,8) in the second roll set (4) of the multi-roll lander (10) is arranged to be movable to the calender roll set in the the first roll set (3) for obtaining two multi-roll sets (3,4) in the plurality calendar (10). 2. Multiple roll calender (10) according to claim 1, characterized in that the rollers (5,6) in the first roll set (3) are soft surface rolls, advantageously spare rolls. • · • * «• · · • ♦ | 3. Multiple roll calender (10) according to claim 1, characterized in that the rolls in the first roll set (3) comprise two spare bend-compensated rolls and a spare thermo roll. »·« * «* ··« f · 4. Multi-roller calender (10) according to any of claims 1-3, characterized in that the second roller set (4) in the multi-roller calendar (10) comprises as Upper and lower roller (9Y, 9A). bend-compensated roller with soft surface and between * * '·; These * are intermediate rolls (7,8), which are hardened surface metal rollers and / or • * \ V soft surface polymer rolls. ··· • · • i m Multiple roll calender (10) according to any one of claims 1-4, characterized in that, in connection with the first body part (1) in the main running direction of the web (W), it is above the roll set ( 3) provided a detachable fixed spacer (11), which is arranged to be removable upon movement of the spacer (s) (7,8) in the second roll set (4) to the first roll set (3). Multicolor calender (10) according to any of claims 1-5, characterized in that in the main running direction (4) in the main running direction of the web (W), an intermediate piece is provided for filling the space which arises between the upper the roller (9Y) and the body part (2) as the intermediate rollers (7,8) move to the first roller set (3). 10 aa • aa • aa • a • a • aa aa aa * 1 • aa • a • ♦ »• eaaaa • ·» ·· # ♦ · • a • «aa« • a • a · • · a ··· a «·« • a • · • aaa «aaaa • aaaa aa a · • aa · aa • a • aa • aaaaaaaaa