winder

Abstract

The invention relates to a winder, in which winder customer rolls are wound of partial webs of a slitted fiber web, which winder comprises at least one winding drum, a frame (17) comprising guides (16), which guides (16) are vertical or + / - 20 degrees inclined in respect of the vertical direction, and a rider roll unit (30), which rider roll unit (30) comprises a rider roll (25), a rider roll beam (35) supporting the rider roll (25) and extending between two ends (36), two end carriers (37) supporting the two ends (36) of the rider roll beam (35) and located movably on the guides (16). The ends (36) of the rider roll beam (35) are attached to the end carriers (37) by resilient plate mountings (40U, 40L).

Description

Technical field

[0001] The invention relates generally to production of fiber webs and to winding of fiber webs, especially in a winder of a slitter-winder. The invention relates to a winder according to the preamble of the independent winder claim.Background

[0002] It is known that fiber webs, e.g. paper and board webs, are manufactured in devices and machines which together constitute a fiber web production line, which can be hundreds of meters long. As known from the prior art in fiber web production lines typically comprise an assembly formed by a number of the devices and the machines arranged consecutively in a process line. A typical production line for fiber web comprises a forming section comprising a head box and a wire section, a press section and a drying section and a reel-up. The production line can further comprise other sections and devices for treatment and / or finishing the fiber web, for example a sizer, a coating device, a calender. The production and treatment line also typically comprises at least one slitter-winder for forming customer rolls as well as a roll packaging apparatus. In present days running speeds of fiber web production lines, especially for certain fiber web grades for example for fluting and liner web grades, are so high that two slitter-winders are needed for slitting and winding the fiber web produced in the fiber web production lines.

[0003] In fiber web production lines, the manufacture of the fiber web takes place as a continuous process. A fiber web completing in the fiber web production line is reeled by a reel-up around a reeling shaft i.e. a reel spool into a parent roll the diameter of which can be more than 5 meters and the weight more than 160 tons. The purpose of reeling is to modify the fiber web manufactured as planar and continuous to a more easily processable form. On the reel-up located in the main fiber web production line, the continuous process of the fiber web machine breaks for the first time and shifts into periodic operation. Reel-ups are thus used in fiber web production for reeling the fiber web coming from the fiber web production line into a parent roll, but reel-ups are also used to reel fiber web coming from a coating machine, a calender or a corresponding finishing device.

[0004] The fiber web wound in the reel-up onto the parent roll is full-width so it must be slit in longitudinal direction into partial webs with suitable width and the partial webs are wound to partial fiber web rolls (customer rolls) with suitable length of fiber web and / or of suitable diameter for the customers. The slitting and winding take place as known from prior art in an appropriate separate machine i.e. in a slitter-winder. Slitter-winders comprise an unwinder, in which the parent roll is unwound, a slitting section, in which from the parent roll unwound fiber web is slitted, i.e. cut in longitudinal direction, to partial webs with desired widths, and a winding section for winding the customer rolls. In winding sections of slitter-winders winding devices of different types are employed, for example multistation winders and two-drum winders. As known in the prior art, also winding with a shaft without cores or together with cores can be employed in the winding of a fiber web into customer rolls on a slitter-winder. On slitter-winders of the multistation winder type, the fiber web is guided from the unwinding via guide rolls to the slitting section where the fiber web is slit into partial webs which are further guided either from above or from below to the winding roll / rolls of the winding stations to be wound up onto cores into customer rolls. Adjacent partial webs are wound up on different sides of the winding roll / on different winding rolls. Multistation winders have one to three winding rolls and in them each partial web is wound to a partial web roll in its own winding station. During winding a winding nip is formed between the winding roll and the partial web rolls to be wound. In the two-drum winders the partial webs are wound around winding cores supported by two winding drums to customer rolls via a nip between the winding drums and the customer being formed. In the two-drum winders also a belt arrangement i.e. a so-called set of belt rolls with belt loop or belt loops located around two guide rolls can be used as the winding drum. During winding a winding nip is formed between the winding drums and the customer rolls wound.

[0005] As known from the prior art, in the slitter-winder the parent roll is unwound in an unwinding section in at least one unwinder, the full-width fiber web is slit on the slitting section into several narrower partial fiber webs (partial webs), which are wound up on a winding section around winding cores into customer rolls. In the slitter-winder when the customer rolls reach desired length and diameter, a set change is performed, in which the partial webs are cut in cross-direction. Tails of the partial webs i.e. trailing ends of the cut partial webs are attached onto the surface of the fiber webs on the surface of customer rolls in the set change by applying onto the surface of the fiber web running towards the customer rolls adhesive, which then attaches the tails onto the surface of the customer rolls. When the customer rolls are completed, in the slitter-winder in the set change the complete customer rolls i.e. the so-called set is removed from the winder and new cores for winding the next set of the customer rolls are set to the winder, after which the process is continued with the winding of the next set of the customer rolls. These stages are repeated periodically until paper runs out of the parent roll in the unwinder, whereby a parent roll change is performed and the operation starts again as the unwinding of a next parent roll.

[0006] In winders typically also a rider roll unit located above the customer rolls is used to load and / or support the customer rolls during winding. The rider roll extends longitudinally over the length of the set of the customer rolls, i.e. in cross direction in respect of the machine direction and is supported typically by means of hydraulic cylinders or screw jacks. The rider roll beam extends longitudinally over the length of the rider roll. The rider roll beam is attached at each of its ends to an end carriage, which is movably supported on vertical or in respect of the vertical direction inclined guides of the frame structure of the winder to move the rider roll beam and the rider roll. The attachment between the rider roll beam and the end carriage has been typically constructed by means of bushings, which allow movement in axial direction. Typically rubber bushings or articulation bearings have been used as the bushings. The use of bushings is based on mechanical need of inclined position of the rider roll beam due to the sometimes-occurring inclined diameter profile of the set of the customer rolls. Vertical stiffness and vertical natural frequency of a rider roll beam is defined by the stiffness of the loading hydraulic cylinders. Stiffness in machine direction (horizontal direction perpendicular to the cross direction) and natural frequency in machine direction in turn are mainly defined by stiffness of the rider roll beam and stiffness of the attachment between the rider roll beam end and the end carrier. Too low stiffness in machine direction may cause structural damage, especially in case of inclined diameter profile in longitudinal direction of the set of the customer rolls. The bushings used in the from the prior art known attachment constructions are very slack and within a bushing considerably movements occurs. The slackness of the attachment bushings between the rider roll end and the end carrier decrease the natural frequency in machine direction significantly, which has a negative effect on vibration situation as the set of customer rolls deforms due to increased time needed to pass the natural frequency area. It should be noted that natural frequencies have a significant effect on vibrations occurring in the winder. The vibrations may cause decreased quality, need to slow down the production to avoid harmful vibration frequencies etc., in worst cases due to resonating vibrations customer rolls may even bounce off the winder causing significant danger to working personnel and damages to nearby structures, not to mention losses in production due to damaged customer rolls and caused break time to correct the situation.

[0007] An object of the present invention is to create a winder, especially suitable for slitter-winders, in which the disadvantages and problems caused by from prior art known support arrangements of rider roll beams of winders are eliminated or at least minimized.

[0008] A further object of the present invention is to create a winder comprising a rider roll, in which the disadvantages and problems relating to vibration and natural frequency properties of from prior art known support arrangements of rider roll beams are eliminated or at least minimized.Summary

[0009] There is a significant need to create a in machine direction stiff and in other directions slackness providing support of a rider roll beam of a winder. Therefore, a main object of the present invention is to provide a solution to this need.

[0010] To achieve the above-mentioned objects and those which come out later, the winder according to the invention is mainly characterized by what is presented in the characterizing part of the independent winder claim. Advantageous features and embodiments of the invention are defined in dependent claims.

[0011] In this description and the claims, the term winding drum is used for simplicity when referring to a support roll / set of support rolls of the winder i.e. including both the meanings of a winding drum and a set of belt rolls. Likewise the term rider roll unit is referring to units comprising a rider roll, typically formed of segmented rolls, and a rider roll beam.. Furthermore in this description, partial webs being wound in the winder and web rolls, customer rolls, being formed are referred to, according to context, either in singular or plural but meaning all partial webs and customer rolls handled in the winder.

[0012] According to the invention in the winder customer rolls are wound of partial webs of a slitted fiber web, which winder comprises at least one winding drum, a frame comprising guides, which guides are vertical or + / - 20 degrees inclined in respect of the vertical direction, and a rider roll unit, which rider roll unit comprises a rider roll, a rider roll beam supporting the rider roll and extending between two ends, two end carriers supporting the two ends of the rider roll beam and located movably on the guides, wherein the ends of the rider roll beam are attached to the end carriers by resilient plate mountings.

[0013] According to an advantageous feature of the invention the resilient plate mounting comprises at least one resilient plate.

[0014] According to an advantageous feature of the invention the resilient plate mounting comprises more than one resilient plates formed as a set of resilient plates.

[0015] According to an advantageous feature of the invention the resilient plate is attached at its upper and lower edges between the end of the rider roll beam and the end carriage by a pair of attachment means.

[0016] According to an advantageous feature of the invention the resilient plate is attached removably to the attachment means.

[0017] According to an advantageous feature of the invention the resilient plates have similar dimensions.

[0018] According to an advantageous feature of the invention in vertical direction of area between opposite surfaces of the end carrier and of the end of the rider roll beam at least two resilient plate mountings are located.

[0019] According to an advantageous feature of the invention one resilient plate mounting in upper part of the area and the other resilient plate mounting in lower part of the area.

[0020] According to an advantageous feature of the invention the resilient plate mounting extends substantially over the whole width of the attachment area between the end carrier and the end of the rider roll beam.

[0021] According to an advantageous feature of the invention thickness of the resilient plate or of the set of the resilient plates in the resilient plate mounting between the end carrier and the end of the rider roll beam is 2 - 8 mm. This provides for good stiffness properties in machine direction and slackness properties in other directions.

[0022] According to an advantageous feature of the invention height of the resilient plate or of the set of the resilient plates in the resilient plate mounting between the end carrier and the end of the rider roll beam is 100 - 500 mm and width of the resilient plate or of the set of the resilient plates in the resilient plate mounting between the end carrier and the end of the rider roll beam is 200-500 mm, whereby a sturdy and reliable mounting is achieved.

[0023] According to an advantageous feature of the invention material of the resilient plate or of the resilient plates in the resilient plate mounting between the end carrier and the end of the rider roll beam is spring steel or quenched and subsequently drawn steel or other high strength or ultra-high strength steel. Minimum tensile strength for high strength steels is about 550 MPa and for ultra-high strength steels about 780 MPa. This provides for good stiffness properties in machine direction and slackness properties in other directions. According to an advantageous feature of the invention yield strength of the resilient plate or of the resilient plates in the resilient plate mounting between the end carrier and the end of the rider roll beam is at least 700 MPa, depending on the thickness of the resilient plate / the set of resilient plates. This provides for good stiffness properties in machine direction and slackness properties in other directions.

[0024] According to one advantageous aspect of the invention in the winder in machine direction stiff and in other directions slackness providing support of the rider roll beam is constructed by resilient plate mounting between the rider roll beam end and the end carrier. The resilient plate mounting provides stiffness in machine direction due to increased stiffness of the attachment between the end carrier and the end of the rider roll beam. Thus, the natural frequency in machine direction can be increased over 5-6 Hz, which decreases time needed to pass resonance frequency of vibration to fractional part in view of the attachment known from prior art. The invention provides that high natural frequency is passed while the customer roll diameter is small, when the frequency changes faster compared to situation in which the customer roll diameter is large. Further, the deformation of the customer rolls decreases and thus, also the vibrations of the winder are decreased.

[0025] According to one advantageous aspect of the invention the resilient plate mounting between the end carrier and the end of the rider roll beam is constructed of a resilient plate or of a set of resilient plates comprising more than one resilient plates, advantageously 2- 5 resilient plates, forming together a plate pack. In the plate pack the plates have a slight movement between each other thus, providing friction effect, which enhances damping of vibrations. Advantageously, the resilient plate mounting extends substantially over the whole width of the attachment area between the end carrier and the end of the rider roll beam.

[0026] According to an advantageous aspect of the invention in vertical direction of area between the end carrier and the end of the rider roll beam at least two resilient plate mountings are located, one in the upper area between the end carrier and the end of the rider roll beam and the other in the lower area between the end carrier and the end of the rider roll beam. Advantageously, the resilient plate mountings in the upper and in the lower area have similar dimensions.

[0027] According to an advantageous aspect of the invention in one end of the rider roll beam in middle area between the end carrier and the end of the rider roll beam a further resilient plate mounting is located. Advantageously, in the middle area located resilient plate mounting is 90 degrees turned in view of the in the upper and in the lower area located resilient plate mountings. This provides a turning joint effect to the resilient plate mounting. The turning joint prevents the rider roll oscillation in cross direction. Stiffness is needed especially in machine direction, but it is important that also the cross direction is not too loose.

[0028] According to an advantageous aspect of the invention, the resilient plate / -s in the resilient plate mounting between the end of the rider roll beam and the end carrier are removable. Thus, resilient plate / -s for the resilient plate mounting can be changed for example to provide the mounting with different stiffness and / or slackness.

[0029] By the invention and its advantageous features several advantages are achieved: Stiffness of the rider roll unit in machine direction increases due to increased stiffness of the resilient plate mounting between the end carrier and the end of the rider roll beam. Thus, the natural frequency in machine direction can be increased over 5Hz, which decreases time needed to pass resonance frequency of vibration to fractional part in view of the attachment known from prior art. Further, the deformation of the customer rolls decreases and thus, also the vibrations of the winder are decreased and further the disadvantages and problems due to vibrations are avoided or at least significantly decreased. Additional advantage is achieved as maintenance need is decreased in view of the prior art arrangements, in which the rocker bearings and the rubber bushings used, are parts that wear, and thus need to be changed regularly.Brief description of the drawings

[0030] Aspects of the invention, however, together with additional objects and advantages thereof, will be best understood from the following description of some example embodiments when read in connection with the accompanying drawings and in the following the invention is described in more detail referring to the accompanying drawing, in which in figure 1 is schematically shown an example of a winder and in figures 2-4 is schematically shown an advantageous example of a resilient plate mounting between an end carriage and an end of a rider roll beam in a winder according to the invention. Detailed description

[0031] In the following description same reference signs designate for similar components unless otherwise mentioned and it should be understood that the examples are susceptible of modification in order to adapt to different usages and conditions within the frames of the invention. Repetition of some reference signs may have been omitted in the figures for clarity reasons. In some of the figures an arrow has been used to indicate rotation direction of the respective main element of the construction.

[0032] In figure 1 is schematically show an example of a winder 10 of a two-drum type slitter-winder. A fiber web F is guided for example from an unwinder 20 to a slitting section 22, in which the fiber web F is slitted in the longitudinal direction into narrower fiber webs F for customer rolls 15. The slitted fiber webs F are after the slitting section 22 guided to the winder 10 onto surface of first winding drum 11 and along the surface of the winding drum 11 through a winding nip formed between the winding drum 11 and customer rolls 15 to be wound around cores 14 to the customer rolls 15. The winder 10 in this example also comprises a second winding drum 12 and in the beginning of winding the cores 14 and during winding of the customer rolls 15 are supported on both of the winding drums 11, 12. The one of both of the winding drums 11,12 may also be formed as a set of belt rolls depending on the type of two-drum winder, in which set of belt rolls an endless loop of belt / belts is arranged around two rolls. The winder 10 comprises a rider roll unit 30 with a rider roll 25, typically formed of segmented rolls, and a rider roll beam 35. The rider roll 25 and the rider roll beam 35 extend longitudinally over length of the set of the customer rolls 15, i.e. in cross direction C (fig. 2-4) in respect of the machine direction M.

[0033] As can be seen from the examples of figures 2-4 in the rider roll unit 30 the rider roll 25 (fig. 1) is supported by the rider roll beam 35. The rider roll beam 35 is arranged movable to move the rider roll 25 respectively to support and / or load the cores 14 (fig. 1) in the beginning of the winding as well as to support and / or load the customer rolls 15 (fig. 1) during winding of the customer rolls 15. The rider roll beam 35 is supported by means of supporting arms 51 and hydraulic cylinders 52 (fig. 4)and extends longitudinally over the length of the rider roll 25. The rider roll beam 35 is attached at each of its ends 36 (only one end is shown in the figures 2-4) to an end carriage 37, which is movably supported on guides 16 (fig. 3), which guides 16 are vertical or + / - 20 degrees inclined in respect of the vertical direction, of the frame structure 17 (fig. 3) of the winder 10 to move the rider roll beam 35 and the rider roll 25. The attachment 40U, 40L between the end 36 of the rider roll beam 35 and the end carriage 37 is a resilient plate mounting 40U, 40L comprising a resilient plate 41U, 41L attached removably at its upper and lower edges between the end 36 of the rider roll beam 35 and the end carriage 37 by a pair of attachment means 42U, 43U; 42L, 43L. In a pair of attachment means 42U, 43U; 42L, 43L for the resilient plate 41U; 41L one attachment means 42U; 42L attach upper edge of the resilient plate 41U; 41L to the end carriage 37 and the other attachment means 43U; 43L attach lower edge of the resilient plate 41U; 41L to the end of the rider roll beam 35 removably. The attachment means 42U, 43U; 42L, 43L may for example have a groove into which the respective edge of the resilient plate 41U; 41L is placed. Further the attachment means 42U, 43U; 42L, 43L may comprise screws or like to further secure steady mounting between the end 36 of the rider roll beam 35 and the end carriage 37. As shown in the example of the figures in vertical direction of area between opposite surfaces of the end carrier 37 and of the end 36 of the rider roll beam 35 at least two resilient plate mountings 40U, 40L are located, one 40U in the upper area and the other 40L in the lower area. Advantageously, the resilient plates 41U; 41L or the resilient plate mountings 40U; 40L in the lower and in the upper area have similar dimensions.

[0034] The resilient plate mounting 40U; 40L between the end carrier and the end 36 of the rider roll beam 37 is constructed of the resilient plate 41U; 41L in the example of the figures 2-4 but it can also be constructed as a set of resilient plates comprising more than one resilient plates, advantageously 2- 5 resilient plates, forming together a plate pack.

[0035] The resilient plate mounting 40U; 40L extends advantageously substantially over the whole width W of the attachment area between the end carrier 37 and the end 36 of the rider roll beam 35. Advantageously, height H of the resilient plate 41U; 41L in the resilient plate mounting 40U; 40L between the end carrier 37 and the end 36 of the rider roll beam 35 is advantageously 100 - 500 mm and width W of the resilient plate in the resilient plate mounting 40U; 40L between the end carrier 37 and the end 36 of the rider roll beam 35 is advantageously 200-500 mm. Thickness of the resilient plate 41U; 41L in the resilient plate mounting 40U; 40L between the end carrier 37 and the end 36 of the rider roll beam 35 is advantageously 2 - 8 mm. Advantageously, material of the resilient plate 41U; 41L in the resilient plate mounting 40U; 40L between the end carrier 37 and the end 36 of the rider roll beam 35 is spring steel or quenched and subsequently drawn steel. Advantageously, yield strength of the resilient plate 41U; 41L in the resilient plate mounting 40U; 40L between the end carrier 37 and the end 36 of the rider roll beam 35 is at least 700 MPa, depending on the thickness of the resilient plate 41U; 41L.

[0036] In the examples of figures 3 and 4 is also shown the resilient plate mounting 40U; 40L, 40M further comprising at one end 36 of the rider roll beam 35 in middle area between the end carrier and the end of the rider roll beam arranged a further resilient plate mounting 40M. Advantageously, in the middle area located resilient plate mounting 40M is 90 degrees turned in view of the in the upper and in the lower area located resilient plate mountings 40U; 40L and comprises a similar resilient plate as the upper and the lower resilient plate mountings 40U, 40L . Advantageously, the resilient plate mounting 40M in the middle area is provided only at one of the ends 36 of the rider roll beam 35.

[0037] In the description in the foregoing, although some functions have been described with reference to certain features, those functions may be performable by other features whether described or not. Although features have been described with reference to certain embodiments or examples, those features may also be present in other embodiments or examples whether described or not. Above the invention has been described by referring to some advantageous examples only to which the invention is not to be narrowly limited. Many modifications and alterations are possible within the invention as defined in the following claims.

Claims

1. Winder, in which winder (10) customer rolls (15) are wound of partial webs of a slitted fiber web (F), which winder (10) comprises - at least one winding drum (11; 12), - a frame (17) comprising guides (16), which guides (16) are vertical or + / - 20 degrees inclined in respect of the vertical direction, - and a rider roll unit (30), which rider roll unit (30) comprises - a rider roll (25), - a rider roll beam (35) supporting the rider roll (25) and extending between two ends (36), - two end carriers (37) supporting the two ends (36) of the rider roll beam (35) and located movably on the guides (16), characterized in, that the ends (36) of the rider roll beam (35) are attached to the end carriers (37) by resilient plate mountings (40U, 40L).

2. Winder according to claim 1, characterized in, that the resilient plate mounting (40U; 40L) comprises at least one resilient plate (41U; 41L).

3. Winder according to claim 1 or 2, characterized in, that the resilient plate mounting (40U; 40L) comprises more than one resilient plates (41U; 41L) formed as a set of resilient plates.

4. Winder according to claim 2 or 3, characterized in, that the resilient plate (41U; 41L) is attached at its upper and lower edges between the end (36) of the rider roll beam (35) and the end carriage (37) by a pair of attachment means (42U, 43U; 42L, 43L).

5. Winder according to claim 4, characterized in, that the resilient plate (41U; 41L) is attached removably to the attachment means (42U, 43U; 42L, 43L).

6. Winder according to any of claims 2-5, characterized in, that the resilient plates (41U; 41L) have similar dimensions.

7. Winder according to any of claims 1-6, characterized in, that in vertical direction of area between opposite surfaces of the end carrier (37) and of the end (36) of the rider roll beam (35) at least two resilient plate mountings (40U, 40L) are located.

8. Winder according to claims 7, characterized in, that one resilient plate mounting (40U) in upper part of the area and the other resilient plate mounting (40L) in lower part of the area.

9. Winder according to any of claims 1-8, characterized in, that the resilient plate mounting (40U, 40L) extends substantially over the whole width (W) of the attachment area between the end carrier (37) and the end (36) of the rider roll beam (35).

10. Winder according to any of claims 2-9, characterized in, that height (H) of the resilient plate (41U; 41L) in the resilient plate mounting (40L; 40U) between the end carrier (37) and the end (36) of the rider roll beam (35) is 100 - 500 mm.

11. Winder according to any of claims 2-10, characterized in, that width (W) of the resilient plate (41U; 41L) in the resilient plate mounting (40U; 40L) between the end carrier (37) and the end (36) of the rider roll beam (35) is 200-500 mm.

12. Winder according to any of claims 2-11, characterized in, that thickness of the resilient plate (41U; 41L) in the resilient plate mounting (40U; 40L) between the end carrier (37) and the end (36) of the rider roll beam (35) is 2 - 8 mm.

13. Winder according to any of claims 2-12, characterized in, that material of the resilient plate (41U; 41L) in the resilient plate mounting (40U; 40L between the end carrier (37) and the end (36) of the rider roll beam (35) is spring steel or quenched and subsequently drawn steel.

14. Winder according to any of claims 2-13, characterized in, that yield strength of the resilient plate (41U; 41L) in the resilient plate mounting (40U, 40) between the end carrier (37) and the end (36) of the rider roll beam (35) is at least 700 MPa.

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