FI112966B - Process and arrangement for processing rollers in a calender - Google Patents

Description

f, 112966

Method and Arrangement for Managing Rolls in a Calender 5 Förfarande och arrangemang för att behandla valsar i en kalander 5

The present invention relates to paper and board machines. More particularly, the present invention relates to a method according to the preamble of claim 1 and to an arrangement according to the preamble of claim 7 for controlling rolls, in particular for relief, roll deflection line, nip line loading and / or quick roll opening in a calender, especially soft calender, multi-roll calender such as super calender and / or On or Off-Line calender.

Calendering is a method generally used to improve the properties of a web-like material, such as a paper web, in particular thickness profile, smoothness, gloss, surface porosity and translucency. In calendering, the paper web is guided into a nip formed between pressed rolls where:. the paper web is deformed by temperature, humidity and nip pressure, whereby the physical properties of the paper web can be affected by adjusting the above parameters and the action time. The benefits of calendering •; these physical properties lead to and produce a better print, ·; ·. through a competitive advantage for the paper manufacturer.

25 - Today, papermaking technology demands ever higher quality; fibers. With the ever-increasing speeds required by paper machines, calendering technology is increasingly moving toward on-line solutions, such as soft calendering and multi-roll on-line calendering. When the purpose, ···. na is to produce higher quality printing paper grades with surface smoothness of 30 PPS <2pm, such as SC-A and LWC roto grades and glossy finish. . kneaded paper grades, it is a fundamental problem that such grades can be achieved in practice only by the use of interlacing and off-line supercalenders after drying the fiber web, which are used in several, usually two or three, to satisfy the production capacity. Soft calendering is calendering in a calender unit where the nipples are formed between a smooth surface press roll such as a metal roll and a roll coated with a flexible coating such as a polymer roll. In a soft calender, nipples are formed between separate pairs of rollers. To process both sides of the web in a soft calender, the order of the pairs of roll forming consecutive nipples relative to the web is inverted to cause the flexible surface roll to act on each surface of the web.

Super-calendering is calendering in a calender unit where nipples are formed between a smooth-faced press roll such as a metal roll and a roll coated with a flexible coating such as a polymer or paper roll. The flexible surface roll conforms to the surface of paper and presses the paper forms the counter-side 15 evenly against the smooth-faced press roll. The supercalender now has typically 10 to 12 nipples and, to process the sides of the web, the supercalender comprises a so-called. a pivoting nipple with two flexible rollers facing each other.

Multi-roll On-Line, Off-Line Calendering is calendering in a calender-20 ridge unit that has a larger number of rolls than a soft calender, typically 6-16. Multi-roll calenders are soft nip calendars.

In multi roller calendars, line pressure increases from the upper nip to the lower nipple due to the • draw; ·. by force of. In order to eliminate this downward pressure on the line, to control the deflection line of the roll, as well as to quickly open the roll, the current mo: ·. in the roller calenders, the earth's pulling mechanism implemented by a cylinder and a lever mechanism. '. man compensates for roller relief. One such roll relief system .. is a line pressure compensation and roll relief system marketed by the Applicant under the trademark Optiload ™.

30 112966 3

The primary object of the present invention is to eliminate and reduce the problems associated with the prior art lightening of rolls in a multi-roll calender and | their effects, and provide a new inventive method j and arrangement for controlling roll relief, roll deflection, nip between the rolls and / or quick opening of the roll which, above all, operate more reliably, accurately, and faster than previous systems.

This object has been achieved by a method and the adapters mentioned above. The main features of the method are set forth in the characterizing part of independent claim 1. The main features of the arrangement are set forth in the characterizing part of independent claim 7.

Thus, the invention is based on the novel and inventive idea of partially or completely lightening the roll mass 15, controlling the roll deflection line and / or controlling the line load between the rolls, preferably long stroke 11a, by adjusting the sliding bearing elements (i.e. sliding shoes). positions, i.e.. the load of the sliding elements vertically and / or obliquely in the upper and / or lower position, whereby. compensate, if desired, for part or all of the earth's attraction.

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Among the advantages of the invention, it can be mentioned that due to the lightening arrangement of the roll integrated in the sliding bearing, the masses of the rolls can be wholly or partially lighter and; # of rolls are manageable in quick release, that roller lightening is controllable. : ·. dipped by means of pressure measurements and adjusting of sliding bearing elements, and that the damping, loading and relief of the hydraulic system is improved.

The invention will now be described in more detail in a preferred embodiment of the invention. . 1 is a schematic representation of a pair of calender rolls in which one of the rolls is provided with a roll relief assembly integrated in a slide bearing according to the invention. 2 and 112966 4 in Fig. 2 schematically illustrate a cross-section of a roll relief assembly of the invention and a preferred hydraulic control system associated therewith.

Referring to Figures 1 and 2, it is generally stated that the function-5 buyer of the slide bearing 10, which is not a novel and inventive papermaking-related element in itself, has the primary function of reducing the amount of rotation and keep roller 3 in proper position. To minimize movement friction, the roller 3 rotates in the sliding bearing 10 on pressure medium films, preferably hydraulic oil films 18, provided by pressure 10 media, passed through thin sliding elements 11s and 11s. The forces in the direction of the nip between the two rolls 2 and 3, i.e. CD, and the length of the paper machine, i.e. MD-j, are transmitted to the bearing housings 10 by a sliding sleeve (not shown) mounted on the roll axis 5. The vertical and 15 obliquely vertical sliding elements 11v mounted on the bearing housings 10, which act as loading elements, receive the nip or CD directional forces and the horizontal slide elements mounted on the bearing housings, which act as side guiding elements, receive the paper machine longitudinal or MD directions. From these elements, forces are further transmitted through the bearing housings 10 to the body of the paper machine. Liukulaakeri- '. The mechanical and hydraulic control valves 15 and 19 coupled to the 1 ls and 1 lv elements control the load of the lsl and lv sliding bearing elements and cause the roll 3 to remain '. in the right position they want. Pressurized hydraulic oil according to the invention. '; ·, Lead to control valves 15, 19 and from control valves to sliding bearing elements 1 ls and 1 l by bores or tubing 12,16 in the bearing housing; 13 and 14 and f * · 25 are preferably connected to the papermaking hydraulic system for bearing housing. This allows control of the roll load on each bearing housing.

In accordance with the invention, the roll relief assembly is integrated in a sliding bearing, preferably. ·, In addition to the function of the plain bearing described above and the structure of the plain bearing bearing. Hereby, the roll mass can be partially or completely lightened and the roll deflection line and / or line nip load between the rolls controlled, preferably 112966 5 by means of 1 lv (i.e. slip ring) vertical slider bearing elements to be loaded directly and / or obliquely. elements) by adjusting the axis 3 of the roller 3 in the circumferential direction spaced apart at different positions, i.

i 5 - perpendicular to the load of 11v of the sliding elements in the upright and 180 ° at right angles to the upper and lower position, symmetrical to the uppermost position in the uppermost position and / or symmetrically to the vertical in the lower position in the lower position 10, and with these loads, partially or completely reduce the mass of the rolls 2, 3, control the deflection line of the rolls 2, 3, the line load of the nip between the rolls 2, 3, and i | 15 - implement a quick opening of calender 1.

The lateral positioning of the rollers 2 and 3 of the calender 1 and the control to remain in the desired correct position are achieved by the horizontal sliding bearing elements 1 ls (i.e., the sliding elements or 2) integrated with the sliding bearing actuating function and the slide bearing bearing structure 10 according to the invention. 3 lightening. The sliding bearing elements 1 ls function as: side relief elements of the roller 2, 3 according to the invention.

I I ·,. The invention will now be described with reference to Figure 2. According to the invention, k> 25 is provided by the hydraulic loading of the slider elements 11s and 11s; '; bearing housing specific control of roll 3 roll off and deflection, which can be; ' * *: uses, for example, cylinders and levers previously known in multi-roll calendars, · ·. instead of a smooth mechanism. The arrangement according to the invention includes a sliding bearing. · * ·, The load and support assembly of the roller 3 is integrated into the bearing housing 10. For lightening the weight of the 30 strands, controlling the deflection line of the roll 3 and the line pressure of the nip, and keeping the roll 3 in the desired position. As illustrated in Figure 2, in this embodiment of the invention, the load and bearing arrangement includes: slidable elements which are horizontally opposed to the axis 5 of the roll 3, acting in the lightening arrangement of the roll 2, loadable sliding elements which act as load elements in the roller lightening arrangement of the roll 3 according to the invention, supply means 12, 15, 16; 13; 14, 19, for supplying a pressurized medium, preferably hydraulic fluid according to the invention, to a receiving space 20 defined by an inner wall of a fixed cylinder 21, a slider 11s or 11v pistonly movable within the cylinder 21 and a circumferentially spaced barrel between the cylinder 21 and the slider , e.g., an O-ring seal for loading the loading and lateral control elements 11s and 11s and the receiving space 20 through the outer circumferential surface of the roll 5 of the roll 3 and the intermediate member 11s or 1l for forming a hydraulic oil film 18 of the same. in the intermediate space, the pressure measuring means 30 for monitoring the condition of the track nip by measuring the pressure of the pressurized medium in the receiving space 20.

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·; 20th In this connection, it should be noted that the calender thermo roll of the above-described calender. smaller rolls do not require the same number of sliding shoes or elements t · 1 lv and 1 ls, but lighter rolls require four pieces of each other i. a slider or element 11 v and 1 ls mounted at an angle of 90 ° and then 25 by adjusting only 11 v of the respective sliding shoes in the upper and lower positions; the load is lightening of the roll masses and full adjustment of the nip line load; * ': Controllable and 1 ls lateral controls only need to be adjusted.

In order that the roll masses may be completely or partially desirable and that the rollers can be completely controlled by quick opening in the roller according to the invention. . the nozzle assembly uses sufficiently long stroke sliding elements of 1 lv and 1 ls. According to the invention, at least the vertical sliding elements are such long-stroke sliding elements 11 v. The roll lightening arrangement according to the invention forms the sliding elements 11 v and 1 ls by loading the web into the nipples with a uniform or other desired linear load. the automation system included in the paper machine control system, and the pressure measurement values obtained from, for example, the pressure measuring unit 30 associated with the slider element 11 v and 1 ls.

As further illustrated in Figure 2, the hydraulic lance control system controlling the roll relief 10 assembly of the invention includes three hydraulic oil inlet connections. The first inlet connection 12 is for controlling the sliding elements to be loaded horizontally along the axis 5 of the roll 3, i.e. the lateral control elements 11s of the roll relief assembly according to the invention. Through the first inlet 12, which is a lateral positioning connection, the hydraulic oil 15 is led to a first control valve 15 having a hydraulic oil distribution chamber and a piston member controlling the hydraulic oil distribution to two separate hydraulic oil manifolds 16 and 17, one of the hydraulic a jet receiving space 20, from which the hydraulic oil is passed through the slide element 11s to the space between the slide element 11s and the axis 5 of the roller 3 to form a hydraulic oil film 18i * 5 * t, from which one hydraulic oil pipe 16 leads to the hyd. hydraulic oil receiving space 20 connected to the right-hand side control element 1 ls; from which the hydraulic oil is passed through the slider element 1 ls; * to the space 5 of the roll 3 to form a hydraulic oil film 25 18 therein. The working inlet connection 13, which is a support connection, and the third inlet connection 14, which is a load connection, are intended for both : *. for direct control of the Liu ball elements 11v, which are vertically and obliquely vertical to the axis 5 of the roll 3, i.e. the load elements 1v of the roller relief arrangement according to the invention. Via the second hydraulic oil supply port 13 • 30, the hydraulic oil is directly fed to the hydraulic oil receiving space 20, * 'perpendicular to the load element 11v vertically below the roll shaft 5, and from the receiving space 20 the hydraulic oil is passed through the in the space between the shaft 5 to form a hydraulic oil film 18 therein. Through the third hydraulic oil inlet port 14, the hydraulic oil is first introduced into a second control valve 5 of the arrangement which is a non-return valve 19 and thereafter the hydraulic oil is led or distributed to a hydraulic oil receiving space 20 perpendicular to the vertical axis to a vertical load element 11 v above the horizontal line of the axis 5.

From the receiving space 20, the hydraulic oil is passed through the slide element 1v to the space between the slide element 1v and the roll shaft 5 to form therein a hydraulic oil film 18.

According to the invention, it is advantageous for the pressure to be measured from the hydraulic oil receiving chamber 20. The measuring device 30 extended to the hydraulic oil receiving chamber 20 provides a necessary measuring signal which can be used to control the hydraulic oil supply to control the roll position and load.

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In order to completely control the track and move the roller weight * in accordance with the invention. fastening of the roller, deflection line and / or line load between rollers and / or track; ·. the distance required for the opening is used in the roller control according to the invention: ·. in the belt assembly, sliding elements of sufficiently long stroke of 11 v and X ls-In this case, the minimum stroke length and stroke length are required to open the nip between the upper rollers: '. increases in increments from nip to nip down in the track. Then the slider: '; the shoe has an impact length of 11 v and 1 ls for moving the roll 2, 3 according to the invention. between 5 and 100 mm and the roller can be loaded with slider elements and 1 ls load • ..> to move the roller relief deflection line and / or line load between rollers • _ 30 and / or the distance required for quick opening of the roller. According to a particularly preferred embodiment of the invention, the quick opening of the rack is controlled by chambers 11 (not shown) with long stroke vertical sliding shoes 1 lv intended for lowering the rack and the quick-release pistons mounted on the flanks of bearing housings (not shown). v and piston-type quick-opening chambers (not shown in the figures) completely replace the previously known cylinder and lever mechanisms for calender roll relief.

The invention has been described above by way of example only by means of a preferred embodiment related to the calender. This, of course, is not intended to limit the invention in any way, and as will be apparent to one skilled in the art, various alternative solutions and modifications are possible within the scope of the invention and the scope of the appended claims. Accordingly, it should be noted that the method and arrangement of the invention also encompasses slide bearings implementations in which there is more than one bearing element in the axial direction of the bearings, whereby the elements or pair of elements can be guided together or separately.

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Claims (17)

A method of mastering the rollers, in particular mastering the relief of the rollers, the bending line of the rollers, the line load in the nip between the rollers and / or the fast opening of the roll kit in a calender, in particular a soft calender, a multipoint calender, such as a super calender and / or an On or Off-Line calender, characterized in that the mass of the roller is partially or completely unloaded and | the bending line of the roller is controlled and / or the line load in the nip between the rollers in | is controlled with a sliding bearing element or a sliding shoe (1 lv, l ls) of long stroke, which is functionally and structurally integrated in a sliding bearing (10) for the shaft (5) of the roller (3), by controlling the load thereof with a pressurized medium. 2. A method according to claim 1, characterized in that pressurized medium is passed through an inlet conduit (13), which is a support conduit, for controlling perpendicularly vertical loading of a sliding element (1v) located below the perpendicular horizontal line of the shaft ( 4,5) of the roller (2,3). 3. A method according to claim 1, characterized in that pressurized medium is passed through an input conduit (14), which is a load conduit, for regulating perpendicularly vertical the load of a sliding element (1 lv) located above the road •: straighten the horizontal line of the shaft (4,5) of the roller (2,3). '1 1 Method according to claim 3, characterized in that the pressurized medium 1, 1 is distributed according to a control valve (19) in the feed line (14) to control both perpendicular and oblique vertical load of the sliding elements (11v) located above. I · for the horizontal horizontal line of the shaft (4,5) of the roller (2,3). • t M I Method according to any one of the preceding claims 1-4, characterized in that the pressurized medium is distributed according to an input line (12) and a control valve. (15) in this via separate distribution pipes (16,17) tili as lateral control selector (1), the sliding element (lls) acting on the horizontal horizontal line of the shaft (lls). 4,5) of the roller (2,3). Method according to any one of the preceding claims 1-4, characterized in that the roller (2,3), by loading the sliding elements (1 lv, l ls) with pressurized medium, advantageously hydraulic oil, is displaced the distance which the relief of roller- i | requires, the bending line and / or line load between the rollers and / or the fast opening of the roll kit, which distance advantageously varies between 5-100 mm. 7. Arrangements for controlling the rollers, in particular controlling the relief of the rollers, the bending line of the rollers, the line load in the nip between the rollers and / or the fast opening of the roll kit in a calender, in particular a soft calender, a multiple calender, such as a super calender. and / or an On or Off-Line calender, characterized in that the advantageously long stroke of sliding bearing elements or a sliding shoe (1 lv, l ls), which is functionally and structurally integrated in a sliding bearing (10) for the shaft (4,5) of the roller (2,3), can be controlled by controlling the load of the sliding shoe (1 lv, l ls) by means of a pressurized medium for relieving the mass of the roller partially or completely and for controlling the bending line of the roller and / or line load in the nip between the rollers. 20 · · · Arrangement according to claim 7, characterized in that the stroke of the sliding shoe (llv, lls) advantageously varies between 5 - 100 mm with the distance that the relief, bending line and / or line load between the rollers and / or • ·;,. 'The quick opening of the roll kit requires. • · »♦ 25» »♦ Arrangement according to claim 7 or 8, characterized in that the arrangement. the manifold comprises at least partially vertically on the shaft (4,5) of the roller (2,3). known sliding shoes (llv), which act as support and load elements for the shaft (4,5) of the roller (2,3) and are spaced apart from each other in circumferential direction. The displacement of the shaft (4,5) of the roller (2,3), advantageously at the perpendicular vertical line at 180 angles in relative to each other in an upper and a lower position, symmetrically in relation to the perpendicular vertical line obliquely at the top in an upper position, and / or 5. symmetrically in relation to the perpendicular vertical line obliquely at the lower position. Arrangement according to claim 7 or 8, characterized in that the arrangement further comprises horizontally on the shaft (4,5) of the roller (2,3) sliding shoes (IIs) located on the horizontal horizontal line of the shaft ( 4,5) of the roller (2,3) opposite each other on opposite sides of the shaft (4,5) of the roller (2,3) and acting as side guide elements for the shaft of the roller (2,3). Arrangement according to any of the preceding claims 7-10, characterized in that the arrangement comprises feeding means (12,15,16; 13; 14,19) for feeding pressurized medium to a receiving space (20) for pressurized medium, which within the I - the inner wall of a fixed cylinder (21), a sliding shoe (11v, 11s) moving piston-like inside the cylinder (21) and 20 - a ring seal (22), such as an O-ring seal, which seals the annular space between the cylinder (21) and the sliding element (11v, 11s) in. Pre-load sliding shoe (11vo and 11) and; ·· 'ii. for conducting pressurized medium from the receiving space (20) through the sliding shoe (11v, 11s) to the space between the outer peripheral surface of the shaft (4,5) of the roller (2,3) and the sliding element (1v, l ls) for forming a media film (18) in the space in question. • • · ··· t Arrangement according to claim 11, characterized in that the print media system controlling the arrangement comprises three input lines for pressurized material; w 1 30 dium, of which »I • · · i» 1 I · · · · · I • · • · · 18 112966 i. a first input line (12) is intended for controlling the sliding elements which are loaded horizontally against the shaft (4) 5) of the roller (2,3) or the side control elements (IIIs) and is provided with a first control valve (15) in the arrangement, which controls the pressure medium to two different distribution tubes (16 and 17) for pressure medium, of which a pressure medium distribution tube (17) leads to the side guide element (1s) on the left side and of which the second pressure medium distribution tube (16) leads to the side control element (1s) on the right side; ii. a second inlet conduit (13) is provided for guiding the sliding elements (1 lv) which are loaded perpendicularly and / or obliquely vertically down to the shaft (4,5) by the roller (2,3) and for supporting the shaft (4,5) of the roller (2,3) and iii. a third inlet conduit (14) is intended for guiding the sliding elements (1v) which are loaded perpendicularly and / or obliquely vertically upwardly against the shaft (4,5) of the roller (2,3) and for loading the shaft (4,5) by the rollers (2,3). [15 Arrangement according to Claim 12, characterized in that the print medium is directed directly through: the second printing medium (13) for pressure medium, which is directly connected to the receiving space (20) perpendicular to the shaft (4,5) perpendicular to the roller (4,5). 2,3) the loading element (1 lv), and that the pressure medium via the third pressure medium supply line (14) is first fed to a second control valve in the arrangement, which valve is a non-return valve (19), and thereafter is led or distributed. the print medium to the print medium receiving space (20) connected; *. - to the perpendicularly vertical above the shaft (4,5) of the vertical (..v.) load element (11v) and / or to the roller (2,3) located to each vertical loading element (1v) located above the horizontal line of the shaft (4,5) of the roller (2,3). • • *. · * ·. Arrangement according to any one of the preceding claims 7-13, characterized by pressure measuring devices (30) for measuring the pressure of the pressure medium in the receiving space (20) for checking the condition of the nip between the rollers (2,3) and the '1 * load of sliding shoes (11s, 11v). I · 19 112966 Arrangement according to any of the preceding claims 7-14, characterized in that the stroke of the sliding shoe (11 s, 11 v) is at least for opening the nip between the upper rollers (2,3) in the calender and that the stroke grows from nip tili nip in the down direction in the roller set. 5 Arrangement according to claim 15, characterized in that the quick opening of the roller set can be controlled with the longitudinal vertical slides (1 lv) designed for unloading the roller set and with chambers fitted with quick opening pistons mounted on the sides of the bearing housings (10). . 10 Arrangement according to any of the preceding claims 7-16, characterized in that the pressure medium is hydraulic oil. I 15 * · · • V • · M t} t I «* Φ •» * * * »a · · • · • · • I»