FI74069B - REGISTERFOERFARANDE OCH -ANORDNING FOER UPPHETTNINGSBREDDEN AV EN PAPPERSBANAS KALANDERVALS. - Google Patents

Description

74069 1 Method and apparatus for adjusting the heating width of a paper web calender roll Adjusting and adjusting the heating width of a paper web 5

The invention relates to a method for paper calender rolls, in particular the so-called kakeo vigilant temperature to adjust the heating width of the calendar within a certain range.

The invention further relates to a device for adjusting the heating width of a calender roll, by means of which the axial width of the temperature to which the heating effect of the pressure gap introduced inside the roll jacket can be spread is spread.

As is known, the calender rolls are heated by introducing a heating medium, such as steam or hot water, into them. Thus, the temperature of the outer surface of the calendar roll will be lower than the inner surface. As a result, the thermal expansion of the outer surface is also smaller, and an internal torque (cf. the bi-metalll phenomenon) is generated in the roll vigil, which causes 20 el to cause displacements in the central part of the roll. However, since there is no counterforce at the end of the sheath at moment el, a slip effect is created called the Oxbow effect. If the Oxbow effect is not taken into account in the roll length measurement or in the heating width, the edges of the paper may be thinner than the calendered center.

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In the previously known calender rolls, fixed plastic rings have been used in connection with their ends, with the aim of which the heating effect has been reduced in the vicinity of the ends of the roll shell. The known arrangement has been used to prevent the disadvantage that the edges of the track tend to calender too much at a high purple pressure, because the temperature of the roll shell tends to rise above average and the resulting changes in roll diameter cause the edge flange of the fish flange to rise.

For a prior art more closely related to the invention, reference is made to U.S. Patent No. A.503,626.

The object of the present invention is to provide a method and apparatus for adjusting the heating width of a calender roll 2 74069 1, which is suitable for use in particular in the so-called in connection with the double jacket temperature.

The object of the invention is to provide a control device for a calender in which the dryness and thickness of the edges of the paper web can be better controlled in order to avoid said Oxbow effect.

It is a further object of the invention to provide a new method and apparatus in question which is easy to use and simple in hardware.

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In order to achieve the above and later objects, the method of the invention is mainly characterized in that said adjustment is performed inside a roll shell by a control arrangement in the vicinity of both ends, which adjusts the roll structure substantially without disassembling the roll ends from the axial width of the space.

The device according to the invention, in turn, is essentially characterized in that said adjusting device comprises an adjusting ring and a sealing part fitted thereto, which seals the roll shell at least against the inner surface and that said adjusting ring is provided directly or through an adjusting member, preferably a screw arrangement. the attached sealing member is displaceable in the axial direction of the temperature for adjusting the heating width.

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With the adjustable ring and seal arrangement according to the invention, the heating width of the calender roll can be adjusted quickly and flexibly without dismantling the roll. This feature is especially important for newspaper calendars.

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The following invention will be described in detail with reference to some embodiments of the invention shown in the figures of the accompanying drawing, to the details of which the invention is in no way narrowly limited.

Figure 1 shows the central end of a calender roll with a control arrangement according to the invention as a central axial suspension.

Fig. 2 shows a control arrangement according to the invention according to the invention.

Fig. 3 shows on a larger scale the tlivistye-5 ring according to Fig. 1.

According to Figure 1, the calender roll 10 is a so-called a double jacket temperature with a spool casing 11. At both ends of the spool casing 11, end portions 12 with shaft pins 14 are fastened with screws 13, by means of which the calender roll 10 is rotatably mounted. The shell 11 interior 16 is provided with kaksolsvalpalla Telavalpan 11 and 17 are left between käksolsvalpan 17, the axial channels 22, through which kalanterltelaa warming medium flows in the direction of the arrow F of the roll from one end to the opposite end.

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The adjustment arrangements shown in Figures 1 are at both opposite ends of the roll 10.

The roll mantle warming medium, such as steam or water is supplied through akselltapin 20 14 central opening 15 päätytllaan V which is defined by the roll 10 end 12 the inner surface vällseinämä 16 and the cylindrical sleeve 19, having a plurality of openings 20. Said openings 20 through the discharge lämmitysvällaine direction of arrow F päätytllaan 21 and gap spaces 22 to the opposite end 22 of the roll, from which the heating medium exits. Other heating medium circulating arrangements may also be used.

According to Figures 1 and 3, heating ring adjustment arrangements are provided in the annular sleeves 21 in connection with the ends of the roller flange 11, by means of which the heating agent can be adjusted between LO and LI. For this purpose, an adjusting ring 24 is arranged on and around the cylinder housing 19, to which is attached by means of a washer 31 and screws 32 from a clamping ring 25, one or more of which overlap. The sealing rings 25 seal the ring 21 between the outer surface of the jacket 19 and the inner surface of the roller flange 11 on the other end side.

The adjustment ring 24 is arranged to be adjustable in the direction of arrow A through 26-säätöruu on. Said adjusting screws are on the circumference of the ring 24, e.g. three 35 a 74069 1 or four evenly spaced. The adjusting screws 26 are fitted in holes 23 in the end 12. The adjusting screws 26 have a thread 27 which is in the thread 28 of the end 12. The inner end of the adjusting screws 26 has a fitting 29,30 by which the adjusting screws 26 are fixed to the adjusting screw 26 24. one end of the biasing element 26a to which a spanner can rotate the adjusting screw 26, thereby moving the end 12 of the hole 28 with thread 24 and move säätOrengasta of the sealing rib 25, narrow arrow A direction between the adjusting kuumennusleveyden LO -Li. Thus, the placement rings 25 limit the width 10 L 2 -L 2 of the ring 21 to which the heating of the heating medium can be spread.

The adjusting structure shown in Figures 1 and 3 is suitable for rollers whose dimensions allow the adjusting screws 26 to be fitted through the end 12 in connection with a width-adjustable space 21.

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Fig. 2, in turn, shows a heating width adjustment arrangement in which the adjusting screws cannot be fitted through the roll ends 12, as in Figs. 1 and 3. According to Fig. 2, the adjustment arrangement comprises a tube section 36 arranged inside the central opening 15 of the shaft pin 14 facing the outside. 37 condensed. Attached to the tube portion 36 at the inner end 16 side of the roll is a flange 35 having an adjusting ring 24 on the outer circumference with spout rings 25. The end flange 35 is shown in full position in the inner position against the inner surface of the roll end 12, with the heating width being greatest. Dashed lines and reference numerals 25 ', 35', 25 36 ', 39' show the heating width adjusting device in the intermediate position. At the end of said tubular part 36 there are clamshell pieces 39 having a slat 26 with an outer clamp 27. The adjusting screws 27 are locked in the axially non-displaceable but rotatable corners 40 fixed by screws 41 to the inner surface of the opening 15 of the shaft pin 37. In the opening 15 is a tubular member 38, 30 from the outside lämmitysvällalne is passed in the direction of the arrow F of the control arrangement according to the invention is determined by the roll 10 kuumennusleveydellä gables and further telavalpan 11 and between the axial passages 17, 22 kaksoisvalpan.

The heating width adjusting device shown in Fig. 2 is more cumbersome to use in that the water switch around it must be at least partially dismantled before the adjusting screws 26 can be accessed. This grievance is not I.

5 74069 1 in the adjusting devices according to Figs. 1 and 3 occurs because the adjustment can be performed from outside the roll only by removing the protective plugs 33 from their thread 34.

In the following, the claims are set forth within the scope of which the various details of the invention may vary and differ from those set forth above by way of example only.

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Claims (7)

1. FS procedure for paper scallop rolls, especially in so-called Two-jacket heat rollers for controlling the heating width 5 (L) of the calender within a given range of variation (L1-L0), characterized in that said government is performed with a control arrangement arranged within the roll casing (11) in the vicinity of both ends thereof. , by which arrangement one is freed from the side of the roll transmitters without substantially disintegrating the construction of the roll, regulates the axial width 10 pt its space (21), to which the flow of the heating medium (F) will propagate. 1 Patent claim Process according to claim 2, characterized in that said government is arranged to be incremental. 15 Method according to Claim 1 or 2, characterized in that the width (L1-L0) / 2 of the control area near the two ends of the roller (10) is within the range 0 ... 200 mm, most preferably 50 ... 100 mm. 4. Control device for the heating width of a calender roll, with each device regulating the axial width (L) of the heating roller (10), to which the heating effect of the pressure fluid to be dissipated inside the roller jacket (11) will spread, characterized in that said control device comprises a control ring (24) and a sealing member (25) arranged therewith, said sealing member seals the roller sheath (11) at least towards the inner surface and that at said control ring (24) or via an intermediate part (36), a control means, most preferably a screw arrangement (26,26A), is attached with which said control ring (24) and the sealing part (25) attached thereto can be displaced in the axial direction of the heating roller (10) for control of the heating width (L). Control device according to claim 4, characterized in that the control device comprises three or more control screws (26), which are arranged in the tail (23) of the roller end (12) with an internal thread (28), that in connection with the internal the end of said control screws (26) has an (29,30) an enclosed control ring (24) and the outer ends of I;