FI116540B - Roll, especially a heatable calender roll or thermal roll - Google Patents

Description

116540

The present invention relates to paper, pulp and similar fibrous web machines. The present invention relates to paper, pulp and similar fiber web machines. More particularly, the present invention relates to a roll, in particular a heated hard surface calender roll, i.e., a thermal roll comprising the ends of a thermal roll and a shaft of a thermal roll and forming a backing roll preferably with an elastic coating such as a polymer the fibrous web is treated with heat and pressure.

The problem with treating the fibrous web is that the temperatures of the peripheral portions of the thermal roll shell tend to rise above the rest of the shell. This problem 15 is compounded by the fact that the width of the fibrous web is often narrower than the width of the nip, whereby the temperature formation of the peripheral parts of the thermo roll is not affected by the lowering. usually a fibrous web. As a result of the higher temperatures of the peripheral portions of the thermo roll casing, the diameters of the end of the thermo roll and the peripheral portion of the casing tend to increase,. ·: ·. as a result, the loading areas of the elastic roller are subjected to a higher load and the con- struction between the elastic roller and the thermal roller increases. In this case, an elastic roll or roll surface; '. : Flint may overheat and be damaged.

In order to solve the temperature problems, EP 796946 discloses a solution for compensating the temperature difference between the coated mantle area of an elastic roll and the uncoated end. EP 796946 proposes an elastic roll head cover. · Using an external insulator or tracking the coolant circulation to the end of the elastic roll. In order to solve temperature problems, a proposal is known from DE: '4128655 to prevent heat transfer in the end areas of a thermal roll from the inner parts of the thermal roll to the outer surface by fitting an outer insulator to the end of the thermal roll. The disadvantage of such insulation solutions is that they can only prevent instantaneous overtemperatures, but in prolonged use, when there is no cooling fibrous web in the periphery of the thermal roll shell, the temperature of the elastic roll increases, which can damage the elastic roll surface.

It is an object of the present invention to provide a novel and improved solution for eliminating, or at least reducing, and controlling the problems caused by the rising temperatures of the peripheral parts of the thermal roll casing.

It is another object of the invention to provide for the continuous handling of an even considerably narrower fibrous web in a nipple by deliberately elastic roll 10.

It is a third object of the invention to provide for a nipple treatment of a non-variable width fibrous web which may be narrower than the width of the elastic roll 15.

It is a fourth object of the invention to increase the contact of the rolls in the periphery of the nip and thereby improve the handling of the fibrous web edge areas in the nip.

• 1 1 20 These objectives have been achieved by the roller mentioned above, which is characterized by its special features. you are configured in the following requirement setting.

I · ψ, 1 ·. Thus, it is generally characteristic of the basic idea of the present invention that at least one peripheral portion of the thermal roll casing is provided with a cooling medium flow passageway 25 comprising at least two radial annular passages which: '1': are spaced apart axially.

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When two or more annular channels are spaced apart in the region of the periphery of the thermal roll, it is preferred according to the invention that each of the individual annular channels in the axial direction has an amount extending axially from the end of the thermal roll to at least the edge of the fibrous web.

In addition, it is recommended that the annular passageways be provided with an amount which can eliminate the excessive temperature of the periphery of the thermal roll casing, i. the temperature of the elastic roller 10 or its coating. Alternatively, to eliminate the excessive temperature rise of the periphery of the periphery of the thermo roll, i.e. adjusting the elastic roll coating to a damaging temperature, adjusting the temperature and / or flow rate of the cooling medium filing in the annular passage (s).

Among the advantages of the invention, it can be mentioned that the temperature of the peripheral portions of the thermal roll casing can now be assuredly continuously maintained, i. elastic roller damaged-. . at a temperature whereby the temperature of the peripheral portion of the thermo roll casing remains * »I] whatever the need is within the desired range of the peripheral portion of the thermo roll casing, which # ·; ·. prevents damage to the counter roll cover due to overtemperature and instantaneous temperature peaks. In this case, it is possible to drive in the nip continuously and accurately. it is not necessary to run the entire calender or fibrous web width of the calender or fiber web machine in the calender or fibrous machine machine, by selecting the desired length of the peripheral portion of the jacket of the thermal roll to be cooled.

25 Due to the controllable surface temperature of the thermo roll, the purpose-: · non-variable width fibrous web is not an obstacle to handling the fibrous web in the nip.

• Advantages can also be mentioned that it is possible to increase the contact of the rolls in the nip edge areas and thus improve the handling of the fibrous web edge areas in the nip.

The peripheral portions of the jacket of the thermo roll according to the invention may also be heated, if necessary, independently of the internal heating of the thermo roll.

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For other advantages and details of the invention, reference is made to the following specific part of the specification.

The invention will now be described by means of a preferred embodiment thereof, with reference to the accompanying drawing, in which FIG. 1 shows a partial longitudinal sectional view of a preferred embodiment of the invention, FIG. 2 is a cross-sectional view of an intermediate ring required for forming a cooling / heating duct, FIG. 3 is a cross-sectional view of another intermediate ring required for forming a cooling / heating duct, FIG. 4 is a cross-sectional view of a cooling / heating medium flow control solution for a cooling / heating medium inlet port (s); FIG. 5 is a cross-sectional view of another cooling / heating medium flow control solution for a cooling / heating medium inlet connection /. . FIG. 6 shows a partially cross-sectional view of another embodiment of the invention. ·; ·. Partial longitudinal section, and .... FIG. 7 is a sectional view taken along line A-A of the embodiment of FIG.

Figures 1 and 6 are longitudinal sections showing a nip N for treating fibrous web 3, wherein the fibrous web 3 is treated by heat and pressure, forming: - a hard surface calender roll or thermo roll 2 having a non-rotatable shaft 10, a jacket 8 rotatable fluid circulation which can be accomplished, for example, by drilling a plurality of parallel bores in the longitudinal axis of the thermo roll to circulate through and pass through the heating medium of the passageways 11, typically a fluid oily medium, and 5 with an 116540 elastic coating 4, e.g. provided with an elastic roller 1 having a rotating jacket 5, a non-rotatable shaft 7 and ends 6.

1 and 6, in order to eliminate, or at least reduce, and control the problems caused by the elevated temperatures of the peripheral portions 8 of the diaphragm roll 2, the region of the peripheral portions of the diaphragm roll 2 has a coolant circuit 14, 17, 18. It is irrelevant to the invention what is the fluid flowing in the cooling medium flow piping. Thus, any generally used and fluid cooling medium may be selected as the cooling medium itself.

In the coolant circuit, the coolant supply from the coolant reservoir 21 to the flow duct comprises a coolant inlet pipe 12 connected to the coolant manifold 13, from which the fluid flow is divided into 15 separate fluid inlets 14 shown in the figure. In addition, the cooling medium cycle comprises supplying half of the cooling medium. la radial annular passageways 16 radially spaced along the peripheral portions of the thermal roller and spaced apart by spacers 15 in the axial direction axial to the longitudinal direction of the thermal roller. 20 15 'which are spaced apart in said axial direction.

t *; ' In the embodiment of Figure 1 there are four ring channels 16 and in the embodiment of Figure 6 there are three ring channels 16. Each ring channel 16 is provided in fluid communication with the manifold 13 independently of the other ring channels.

In the embodiment of Figure 1, the three inner annular passageways 16 in the longitudinal direction of the thermal roller 2 are provided with their own coolant inlet 14 and the fourth annular passageway 30 16, in the longitudinal direction of the thermal roller, flows from the end of the manifold 13. In the embodiment of Fig. 6, the three annular channels 16 of the terra 116540 mate 2 are each provided with its own cooling medium inlet 14, into which the cooling medium flows from the logs 13.

5, it should be emphasized that the number of annular channels 16 as well as the individual coolant feed connections 14 may deviate significantly from the above numbers, especially when the purpose of extending the peripheral portion of the thermal roll 2 to at the edge of the diaper 8.

10 To remove the coolant from the annular channels 16 to the coolant reservoir 21, the annular channels are in fluid communication with the individual coolant outflow connections 17.

In the embodiment of Figure 1, there are four outflow connections 17 illustrated by a broken line. The cooling medium flows from the ring ducts into 16 separate outlets. . through the flow lines 17 and the common cooling medium collecting supports 18 to the cooling medium outflow tube 19. In the embodiment of Figure 1, the outflow tube 19 is provided with a coolant recirculation pump 20 to provide cooling medium .... 20 and flow rate to coolant inlet 21 and adjusting the periphery of the diaper 8 of the thermo roll 2; '* To adjust the temperature of the part.

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In the embodiment of Figure 6, the outflow connections required for three separate ring passageways 16 are not illustrated. Through such separate outflow connections, the cooling medium flows to a common cooling medium collecting support 18. The recycling of cooling medium after the collecting support 18 is not shown. , because it can be implemented in the same manner as in the direct '5' embodiment of Figure 1, i.e., from the collection support 18, the cooling medium flows through the cooling medium. The jet 30 outflow conduit 19 having a coolant recirculation pump for controlling the coolant flow rate and / or flow rate into the coolant reservoir and further cooling medium into the inlet conduit can be adjusted to adjust the temperature of the peripheral portion 8 of the thermal roll 2.

In both the embodiment of Figure 1 and Figure 6, to enhance the cooling of the peripheral portion of the jacket 8 of the thermal roller 2, the coolant medium tank 21 may be provided with coolant medium cooling means so that the coolant medium can be supplied at the desired temperature.

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Referring to Figure 2. According to the invention, the annular channels 16 are spaced apart by spacers 15. In order to determine the width of the annular channel 16 and to form a fluid flow barrier on the one hand, the two spacer rings 15 defining the annular channel 16 are spaced apart by the spacer 151. The spacer 151 is preferably secured to or secured to the spacer ring 15. 10, the end of the shaft of the thermal roller being, for example, a sor *, formed by a dowel in the axial direction, spaced from one another as a spacer ring. The radial ring closures are formed, wherein the annular channels 16 are formed by a ring. >. 20 between the gas fuses.

The spacer 151 is attached or secured to the side of the spacer 15 or annular projection such that the spacer extends axially across the annular conduit 16 in the annular conduit 16 and provides a flow path for the fluid in the annular conduit. Typically, any spacer rings or ring fittings are provided with such spacers 151. 1

Reference is made to Fig. 3, which shows the outermost 'in the longitudinal direction of the thermal roller 2; An 'intermediate ring 15' defining, together with an adjacent intermediate ring 15, which is an inner intermediate ring in the longitudinal axis of the thermo roll, an outer ring channel 16.

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The outermost spacer 15 'has or is fitted with a first spacer 151 which axially extends in the annular passageway across the annular passageway and provides a flow barrier to the medium. Further, this outermost spacer ring 15 'has a second spacer 152 which extends axially outwardly across the annular conduit across the annular conduit and provides a flow barrier to the medium.

Referring to Figures 1, 6 and 7. According to the invention, when the annular conduit 16 is used to cool the peripheral portion of the diaper 8 of the thermal roller 2, the media inlet 10 is in fluid communication with spacer 151, 152 to conduct medium to annular conduit 16 and to remove fluid from annular conduit 151, 152 from one side to the fluid outflow connection 17. Thus, according to the invention, the medium flows from one side of the spacer 151, 152 to the other side of the spacer 15 in the annular channel 16.

According to the invention, in the axial direction of the thermal roller 2, the number of individual ring channels _ '\ 16 is in each case of an amount having a dimension in the axial direction of the thermal roller:>. covers at least the portion between the edge 3 of the fibrous web and the edge 8 of the sheath 8 of the thermal roll 2, ..: 20 den. Hereby, the cooling / heating medium may flow unrestrictedly to all annular passageways 16 at the periphery of the thermo roll casing.

25 •. In order to eliminate this weakness, according to the invention, only an amount of the annular passageways 16 can be used which can eliminate the excess temperature of the peripheral regions of the diaper 8 of the thermo roll 2 so that the surface temperature of the peripheral portions of the thermo roll will remain below the temperature. 30 or a coating thereof 4.

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With reference to Figures 4 and 5, only one of the outer annular passageways of thermal ring roller 2 can be operated in the axial direction of thermal roller so that the peripheral portion of the thermal roll casing 8 is only cooled between the required inner edge of fibrous web 3 is a distribution of coolant in the log 13 and the flow control means 22, 22 'provided by the inlet connections 14. In this case, the cooling / heating medium can be supplied only to those outer annular passages 16 which cover the edge of the fibrous web 3 and the edge 8 of the diaper 8 of the outer thermal roll 2.

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In the embodiment of Fig. 4, the distribution and adjustment of the flows of the cooling / heating medium from the manifold 13 to the inlet fittings 14 are effected by the flow control valves 22. Such a control valve 22 is located at each junction of the manifold 13 and the inlet fitting 14. A similar flow control valve 22 15 may also be disposed at the end of the manifold 13 to control the flow of fluid to the end of the jacket 8 of the thermal roller 2 in the open, outer annular passage 16. This manifold. ·. ·. However, an adjusting valve located at the 13-end is not necessary since the open annular conduit at the end of the diaphragm 2 diaper is the outer annular conduit and the entire annular conduit. ·: ·. the fluid flow can be stopped by stopping the circulation pump 20.

·;. · 20: * ·. ' In the embodiment of Figure 5, the distribution and adjustment of the flows of the cooling / heating medium from the manifold 13 to the inlet fittings 14 is effected by a reciprocating spindle means 22 'on the inside of the manifold, comprising a valve member and a shaft member. Such a spindle means 22 'can thus move back and forth in the manifold. The medium 25 may then flow from one side of the valve portion of the spindle means 22 'in fluid communication with the fluid inlet pipe 12, to one or more inlet ports 14. A similar flow control valve 22 may also be disposed at the end of the manifold 13 to to the end of the diaper 8 into the open, outer annular conduit 16. With the same spindle spacer 22, the fluid flow can be controlled or prevented to flow to the end of the diaphragm 2 diaper 2 into the open outer annular conduit. It should be noted, however, that the entire fluid flow can be stopped by stopping the circulation pump 20.

Referring again to Figure 1, which shows a first embodiment 5 of the invention, and to Figures 6 and 7, which show a second embodiment of the invention. These embodiments differ most substantially in that: - in the embodiment of Fig. 1, the cooling medium is led to the peripheral portion of the thermal roll 2 in the rotating jacket 16, to the annular passages 16 underneath the rotating end sleeve 23; and annular passageways 16 between the rotating jacket 8.

The annular channels 16 of the embodiment of Figure 1 may be formed e.g. by machining, for example, a smaller diameter zone on the end 8 of the diaper portion 2 of the thermal roller 2, around which a plurality of spacers (four in Figure 1) are spaced apart, and finally, the end sleeve is fitted around the spacer rings. It is preferred that the end sleeve. : ·. a highly thermally conductive metal or alloy is selected as the material so that the delay 20 to achieve the cooling effect is as short as possible. Because here:. in the first embodiment of the invention, the cooling medium interacts with each other: between the stationary parts / surfaces, the cooling medium may be freely selected and any fluid cooling medium may be used to achieve the objects of the invention.

25 '. The ring channels 16 of the embodiment of Figures 6 and 7 may be formed e.g. such that the radial roll 2 is machined to the end 10 of the shaft 10 by, for example, turning a plurality of radial annular recesses which form ring passages 16 with the inner surface of the shell 8 of the thermal roll 2. the delay to achieve the cooling effect is even shorter than in the first embodiment. Since in this second embodiment the cooling medium acts relative to one another between the moving surfaces, the cooling medium is lubricating. In addition, in this embodiment, the cooling medium may also serve as a lubricant for the 5-roll roll shell.

The invention has been described above by way of example only, with reference to a preferred embodiment thereof and with some preferred embodiments thereof. This is, of course, not intended in any way to limit the invention to such an exemplary embodiment. Thus, as will be apparent to one skilled in the art, many alternative solutions and modifications are possible within the scope of the invention as defined in the appended claims.

Claims (11)

116540 A roll, in particular a heated hard calender calender roll or thermo roll (2) comprising a thermo roll end (9) and a thermo roll shaft (10) and a hard surface thermo roll casing (8) and forming a counter roll (1) preferably with an elastic coating (4) an elastic roll having a nip (N) with a jacket (5), such as a polymeric coating, wherein the fibrous web (3) is subjected to heat and pressure, characterized in that at least one edge portion of the jacket (8) a flow channel (12,13,14,15,16,17,18,19) of the cooling medium 10, comprising at least two radial annular passages (16) spaced apart in the axial direction of the thermal roller (2). Roll according to Claim 1, characterized in that, in the axial direction, the individual annular channels (16) are in each case used in an amount whose axial dimension covers at least the portion between the edge of the fibrous web (3) and the edge of the jacket (8). Roll according to one of Claims 1, characterized in that the annular passageways (16) are provided with an amount which can be eliminated by the thermal roll (2); excess temperature of the end region of the jacket (8), which is an elastic roll (1); or. *; the temperature damaging the coating (4). Roll according to one of Claims 1 to 3, characterized in that the thermo-'': 25 to eliminate the excessive temperature rise of the peripheral portion of the roll (2): the temperature of the cooling medium flowing in the annular passageways (16) and / or the flow rate is adjusted. 1 * '. Roll according to Claim 1, characterized by cooling medium flow, ···, 30 sää adjusting means (22, 22 ′), which are mated to inlet channels (9) and 6540 in the coolant manifold (13) and separate inlet connections (14). . Roll according to Claim 5, characterized in that the flow control means include a flow control valve (22) through which the coolant distribution manifold (13) is in fluid communication with the coolant inlet (14). Roll according to Claim 5, characterized in that the flow control means comprise a spindle means (22 ') movable in front of the coolant flow manifold (13), which divides the coolant from the flow manifold (13) into the inlet ports (14). Roll according to one of Claims 1 to 7, characterized in that the periphery of the periphery of the shaft (10) of the thermal roll (2) has machined radial annular recesses which are axially spaced from one another, the annular passages (16) being formed by the (8) radial recesses delimiting the inner surface and annular recesses. • · ... 20 Roll according to one of Claims 1 to 7, characterized in that the annular passages (16) are located between the radial spacers (15) which are spacers. ·,: (15) are axially spaced • »around the peripheral portion of the thermal roller (2). · · ·, Apart. · Roll according to Claim 9, characterized in the axial: axial direction of the thermal roller (2) in the outermost spacer ring (15 ') which defines together with the adjacent spacer ring (15) which is in the inner axial direction of the thermal roller. the annular ring, the outermost annular channel (16), is connected to the first spacer (151) facing the spacer in an axial direction of the thermo roll 111540 and to the second spacer (152) extending out of the spacer in the axial direction of the thermo roll. Roll according to one of Claims 8 to 10, characterized in that, between the two spacer rings or annular projections (15) defining between the annular passages (16), there is a spacer (151) attached to the spacer ring or annular projection and forming in the annular passage, the flow barrier for the cooling medium, wherein the fluid inlet duct (12, 13, 14) is in fluid communication with one side of the spacer (151, 152) and the media 10 outflow duct (17, 18, 19) is in fluid communication with the other. 15 t »» · »• <I» »» · * 1 I · * 1 s * 1> 116540