FI119336B - Method for modernizing the calender and modernizing the calender - Google Patents

Description

119336

Method for modernizing the calender and modernizing the calender

The invention relates to a method for modernizing a calender according to the preamble of claim 1.

The invention also relates to a modernized calender according to the preamble of claim 10.

As is known in the art, calenders having stacked rolls or nipples stacked for nip contact are divided into machine calendars, soft-fish pitchers and multi-roll calenders. Machine calendars generally have 1 to 2 nips and nip forming rolls are generally hard rolls. Soft calenders, on the other hand, have one to four nips and at least one of the nip rolls is coated with a soft polymer coating, i.e. a so-called soft polymer coated roll. Multi-roll calendars usually have three to eleven nips. One multi-roll lantern is a so-called OptiLoad-type calender, which is described, for example, in Applicant's patent FI-96334. In addition to deflection rolls, multi roll roll calendars generally have both heated rolls and rolls coated with a soft polymer coating. A calendar can also be more than one roller, ·· · • · ·: · [so that it has at least two roll stacks or rolls.

As is known in the art, multi-roll machine calendars are generally used in fiber-making machines and fiber-making lines, such as newsprint. 25 in paper and board machines. One problem with the machine calender is that machine calendering drops the strength of the fibrous web and the • · * · * web may be compressed excessively and the fibers may break. Often, modernization • • * ···] has replaced the multi-roll machine calender with a soft calender in order to achieve better quality, print and strength values.

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Figure 1 schematically shows a prior art multi-roll machine calender. In the calendars of Fig. 1, the web W 'is led from the dryer section from its last cylinders 20' inside the hood 2Γ to the upper nip N 'of the calender 10' roller 19 '. Thereafter, the web W '5 passes through each nip N' to the lowest nip of the calender, from where it is led to a roll 25 '. In the embodiment shown in Figure 1, the lowest roll 13 'and the third upper roll 13' are deflection compensated rolls and the other rolls are hard rolls. The lowest roller is provided with drive 15 'and the third highest roller is provided with an overload / relief device 17'. Figure 1 also shows the opening assembly 16 'of the calender 10' 10 and the guide 16A 'of the opening assembly 16'. Through the opening apparatus 16 ', the nips N' between the rollers 13 'are opened, for example, during roll change or threading. In the calender 10 ', the rolls 13' are secured by the arms 12 'to the calender body 11'. The pivot points of each arm 12 'are designated by reference numeral 18'. The opening position of the opening device 16 'for each roll 13' is marked by the opening points 16B 'marked on the guide 16A'.

Since the multi-roll machine calender does not always achieve the desired quality, printing and strength properties in the fiber web production lines through the calendering process, the machine calendars have been replaced by the upgraded lines • · * .1 · 20, for example soft- and optiL. However, tracing a completely new calender to a papermaking line is an expensive and complicated option.

Therefore, it is an object of the present invention to provide a method whereby a machine calender already in a fiber making line can be easily and simply remodeled into a soft or OptiLoad type calendar.

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It is also an object of the invention to provide a modernized calender which is • · T based on a machine calender and is modernized to a soft or OptiLoad type • · · • · * ··· 1 calender.

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In order to achieve the foregoing and further objects, the process according to the invention is essentially characterized by what is stated in the characterizing part of claim 1.

The modernized calender according to the invention, in turn, is characterized by what is disclosed in the characterizing part of claim 10.

According to the invention, the machine calender in the fiber web production line is modernized to a soft or OptiLoad calender by simple and easy utilization of the high body of the multi-roll calender and by mapping the calipers nip fastening devices and the necessary polymer rolls to the roller. If necessary, new rolls are added to the assembly, but old rolls can also be utilized in whole or in part. In addition, the variable diameter of the roll 15 is taken into account, whereby the calender construction takes into account, for example, bearing housings, scrapers, bracing, threading of the web so that the nipples are open during threading and additionally drives and output rolls are selected. In addition, in some cases, the old frame may need to be stiffened.

In the course of modernization, the above issues will be reviewed on a case-by-case basis and the necessary changes, such as load changes, will be made. The above · · · · · · · · · points allow different types of solutions. This results in an online, * multi-roll calender, which can be located in the fiber web production line before the roll, • · · possibly as an intermediate calender and before coating or as a Breaker Stack calender * · • · between drying groups. According to one embodiment of the invention, a calendar. 25 can be upgraded to a so-called TwinLine multi-roll calender,, ···. with track on both sides of the calender body.

• · ··· ·· ♦ • · * · ***. Thus, according to the invention, a ready-to-use machine calender run is utilized. the size of the new calender rolls with soft coating.

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When upgrading the machine calender to an OptiLoad-type calender, the calender rollers are mounted on the body and equipped with a quick-release system to allow head tapping to open the track nipples to prevent damage to the polymer-coated soft rollers. Each roller is provided with an actuator and, if necessary, the output rollers are positioned in the structure. Any thread changes can be made by using suitable control and guide rollers. If necessary, the frame will be reinforced and, at the same time, the equipment and means for monitoring the condition of the polymer rolls, as well as any necessary wetting means, will be installed.

10 With the modernization of the machine calender to a soft calender, actuators are added to the rollers and the former pneumatic load is converted to a hydraulic load. The movements of the calender rolls, for example the opening movements, are easily accomplished by a loading cylinder arranged in connection with the roll. Through the loading cylinder, the load alternatives for the track can be implemented either by measuring the load 15 in the upper roll of the nip directly from above or by tracking the lever to pass through the body.

Because the body of the multi-roll calender is generally hollow, with a solid • ti ϊ · * end and because it has, e.g. installation grooves in connection with the modernization of the invention • 1 ·] * '· * 20 cover any openings in the frame to prevent dirt from entering the frame structures.

• · • · ·

With the modernization of the multi-roll calender, the old * * • · blade frame can be fitted to the body of the old machine fish, according to need. 25 rolls, thermal rollers, deflection compensated rolls, or so-called soft "··, polymer-coated rolls. If desired, rolls from the former machine calendar may be used. The new rolls are selected according to the paper type as well as the roller rollers. jigging in a modernized calender A modernized calender has several rolls, but at least there are rolls to form one hard nipple • · • · ϊ 1 for 30 caliber and one soft nipple to control the surface. other necessary accessories and accessories, such as humidifiers, can of course be installed, in addition to the necessary control and automation changes during modernization, etc.

Compared to a completely new investment, the modernization of the multi-5 lacon calender according to the invention can save about 30-50%, for example, in a two-nip soft calender.

In the following, the invention will be described in more detail with reference to the figures in the accompanying drawings, however, the details of which are not to be construed as being narrowly limited.

Figure 1 illustrates a prior art multi-roll calender that can be modernized through the invention.

Figure 2 shows an OptiLoad-type calender modernized from the prior art multi-roll machine calender of Figure 1.

Figure 3 schematically illustrates an application for upgrading the prior art multi-roll calender to a three roll soft-calender • * • *.

Figure 4 schematically illustrates an embodiment of the technology of Figure 1 for modernizing a multi-roll calender known from the prior art into a two-roll soft- * * · · · ················································· · * Calendered.

One prior art multi-roll calender 10 'illustrates a calender body 11 to which body 11' has calender rolls 13 'fastened by the arms 12'. A * * calendering nipple N 'is formed between each overlapping calender roll 13'. The arms 12 'are pivoted about the pivot point 18', for example .. * 30 when opened by the roller 19 'opening device 16' when moving the handle * * V *: 12 ' The third upper calender roll 13 'of the calender stack is provided with 6,119,336 overload / lightening apparatus 17'. The lower roll 14 'of the roll 19' is stolen by drive 15 'and the lower roll 14' and the third upper roll 13 'of the calender roll 19' are deflection compensated rolls. Other rollers are hard rollers.

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The calender modernization according to the invention utilizes the high body of the multi-roll calender and arranges the calender nip quick release devices and the necessary polymer roll monitoring devices along the frame and, if necessary, make new pressure calculations for the deflection compensated rolls. If necessary, new rolls are added to the size-10 assembly, but old rolls can also be utilized either completely or partially. In addition, any variable roll diameter (s) is taken into account, whereby the calender construction takes into account, for example, bearing housings, scrapers, brackets, web threading such that the nipples are open during threading and additionally drives and output rollers are selected. In addition, in some cases, the old frame may need to be stiffened. In the course of modernization, the above issues will be reviewed on a case-by-case basis and the necessary changes will be made, for example, load changes.

Fig. 2 schematically shows an OptiLoad-type calender 30 of the 920 multi-roll calender 10 'according to the invention. Mo-♦ · ·: The deminished calender 30 comprises an old calender body 11. In connection with the body 11. * Tea is fitted with OptiLoad-type calender rolls 33, each of which has been stolen by drive · · · 35 and each of which is individually capable of being loaded by itself in the prior art • · * ·· *. From the previous processing step of the web W, e.g. From the 25 dryer drying cylinders 20, the web W is guided to the rib 11 via a stiffening / spreading, guiding or tension measuring roller 31 to a first caliper N, which in this embodiment is a roll 39 upper nipple.

The web W is then guided through the other guide and guide rolls to pass through the calendering nips N and is further processed through the last calender nips. Roll types and roll sharpness are selected using good known roll types and roll rolls according to the 7,119,336 paper types being produced. Typically, the upper and lower rollers are deflection compensated (tk), either hard or soft surface rolls. The deflection compensated roll may also be in an intermediate position. The order of the intermediate rolls is influenced by the requirements of the upcoming paper, such as the need for calendering: roughness, smoothness, gloss, and things that affect one-sidedness, for example.

Figure 3 schematically shows, for example, a modernized version of the multi-roll calender 10 'known from the prior art according to Figure 1 into a three-way soft calender. The modernized calendar 40 comprises an earlier calender run-10 gon 11, to which, for example, a tk-type calender roll, which is deflected, is attached to the upper calender roll of the track 49 via the lever arm 42. The other end of the arm 42 is connected to the loading apparatus 47 and the arm 42 pivots the roll about the pivot point 48 toward the calendering station, whereby the top roll and the middle roll are nip-contacted with each other. The middle roll 15 is fixedly attached to the body 11 and the lowest roll must be movable, for example, a Sym roll or a ZS or CDS movable jacket roll which is nip contacted with the middle roll to provide two calendering nips. The roll order, roll types and coatings used will vary from case to case.

For example, a bottom roll may be movable, such as a top roll, in which case the roll may be a roll, or other suitable roll.

In the embodiment shown in FIGS. 4A-4B, for example, the technology of FIG. from the prior art to a modernized version of the multi-roll calender calender as a soft calender 50. The soft calender 50 according to this embodiment of the invention is dual, 25 roll and roll 53 53 of the roll 59 form a calendering nip N, which is · · · " The roll to be calendered is guided to the calender body can be fitted with a guide roll 51. The use of the rolls is denoted by reference numeral 55. An induction heater 58 is provided at the lower roller of the calender and the upper roller is mounted on the shaft 52, a loading device 57A may be attached to the rear frame • • * · ·· connection 30 side. Another alternative way of applying the load is to · · V *: attach the loading device 57B on the same side as the roll 11 with the frame 11.

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In addition, any load may be placed in front of the rollers. It is also possible to carry the load device from outside the calender.

Figure 4B shows clearly how the calender body 11 is hollow. In general, the upper end of the body 11 is closed and is shown in section in this figure. For example, in the embodiment described herein, the height requirement of the body 11 is reduced, the openings remaining at the top being covered to prevent dirt and impurities from entering the body 11.

The invention has been described above with reference only to some preferred embodiments thereof, the details of which, however, are not to be construed as being limited in any way.

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Claims (16)

A method for modernizing a calender, comprising: modernizing a multi-roll calender (10 ') comprising a calender body (1Γ) 5 and a calender roll (13') superimposed on one another to form at least one calender roll (19 '); wherein a calendering nip (Ν ') is formed between the two overlapping rolls (13'), characterized in that the method modernizes the multi-roll calender (10 ') by leaving the new calender (30; 40; 50) body to be modernized (10'). (11) for mounting calender rollers (33; 43; 53) and nip (N) quick release devices and condition monitoring devices for the rollers (33; 43; 53). Method according to Claim 1, characterized in that the multi-roll machine calendar (10 ') is upgraded to an OptiLoad-type calender (30) by installing the rolls (33) of the OptiLoad-type calender (30) on the calender body (11). with a quick-release device, that each roll (33) is provided with an actuator (35) and that in connection with the calender (30) • »• · *! • * fit the take-up rollers (31) and any guide and / or guide rolls of the web (W) required by the thread changes. • ♦ · • «• · Method according to claim 1, characterized in that in the method, the multi-roll calender (10 ') is modernized to a soft calender (40; •' 1 50) such that the soft calender (40; 50) the rolls (43; 53) are mounted on a multi-roll. 25, that the rollers (43; 53) are provided with an actuator (55) and that the load is converted from a pneumatic load to a hydraulic load. • · • · * · · · ·. A method according to claim 3, characterized in that a load cylinder (47; 57A; · · · · · 57B) is provided in connection with the soft calender (40; 50) to implement the load alternatives. 119336 ίο Method according to claim 4, characterized in that the loading cylinder (57B) is connected to load the top roll of the roller (59) directly from above. A method according to claim 4, characterized in that in the method, the loading cylinder (57A) is arranged to load the top roll of the roller (59) by arranging a lever passing through the body with the roller. Method according to one of the preceding claims, characterized in that, according to the method, calender rolls, thermo rolls, deflection compensated rolls and / or soft rolls, are arranged according to the desired roll order according to the need. A method according to any one of the preceding claims, characterized in that the method comprises placing rolls on the calender so as to form at least one hard nip and one soft nip. A method according to any one of the preceding claims, characterized in that the method comprises fitting humidifying devices to the calender and making the necessary control and automation changes. • a ,. * · * 10. A modernized calender modernized from a multi-roll calender • * e: ... · (10 ') comprising a calender body (1Γ), a calender roll (13') forming at least one roller (19 '). ), wherein the overlapping rolls have calendering nips (N), characterized in that the modernized calender aaaaa * ··· * (30; 40; 50) comprises a body (1Γ) of a multi-roll calender and a roll (33; 43; 53) of calendars. and nip quick release devices and condition monitoring devices for the rollers (33; a 43; 53). 30 • a a a * a a aa a a 11 119336 9 119336 Calender according to Claim 10, characterized in that the modernized calender (30) is an OptiLoad-type calender, in which the rolls of the OptiLoad calender are mounted on the calender (30) body (11) and provided with actuators and include extraction rolls and guiding and / or guiding rolls of the web (W). Calender according to Claim 10, characterized in that the modernized calender is a soft calender, in which the rolls of the soft calender are mounted on the frame (11) and the rolls are provided with actuators and the load is hydraulic. Calender according to Claim 12, characterized in that a loading cylinder is arranged in connection with the rolls of the soft calender. Calender according to one of Claims 10 to 13, characterized in that the calender comprises calender rolls in the desired roll order: thermo rolls, bending compensated rolls and / or soft rolls. 1 · 1: A calender according to any one of claims 10 to 14, characterized in that the caliper · ·: V: 20 has at least one hard nip and one soft nip. · · · · · · · · · Calender according to one of Claims 10 to 15, characterized in that the calender has humidifying devices and control and automation means. ··· • 1 • · • · ♦ • · · · · · · · · · · · · · · · · · · · ··· • · · • · 12 119336