FI123278B - Arrangement in a fiber web machine and device - Google Patents

Description

APPLICATION WITH FIBER MACHINE MACHINE AND DEVICE

The invention relates to an arrangement on a fiber web machine comprising: - at least one support port in which the web is arranged to run unilaterally supported on the support surface, - blowing means arranged to form at least one support port blowing means in the transverse direction of the machine - the blowing means are arranged mainly in the form of a support outlet.

Further, the invention also relates to a device.

It is known in the art to use relatively large tensile differences, i.e. to tighten the web, in the dry spacer group spacing of a fiber web machine. One reason for this is the opening / closing gap between the dryer cylinder and the dryer fabric, which dictates a minimum draft difference.

Figure 1 is a side elevational view of a section between the drying section 20 of a fiber web machine. The picture is an exaggerated drawing of the W edge of the track in four different driving situations. The edge may be secured to the drying cylinder 18.1 or be disengaged to varying degrees from the surface of the drying cylinder 18.1 at a support port 10.2 where the web W is supported unilaterally against the surface of the drying cylinder 18.1. Similarly, the group interval can also be a mirror image of the group interval of Figure 1. The web W would then run in the opposite direction and the detachment of the web edge from the drying cylinder δ ^ would increase as it went up.

ό 30 As a possible explanation for the behavior of the web edge, Er has just been shown the magnitude of tensile differences. It has been shown that it is with the large tensile differences, for example, besides the paper type, that the edge of the web, o 2, is better adhered to the support surface of the unilaterally supported gap.

However, a large difference in tensile strength (for example up to 4% to 5%) is disadvantageous, for example, because of the qualitative aspects of the final product, which would make it desirable to reduce the difference in tensile strength.

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In addition, the pulp needs to be ground more due to the large differences in tensile strength.

As the tension difference is reduced, the separation of the track W edge 5 is observed to originate in the remainder of the unsupported area 10.2. Further, if the draw difference is further reduced, this will result in detachment from cylinder 18.1 already occurring in the opening 22 of the dryer fabric 23.1 and cylinder 18.1, apart from the draw difference, many other factors being mentioned, some of which include speed, dry matter and / or mass.

In addition, stretching of the edge of the unsupported web as a result of the web being detached from the support surface causes pleats and breaks. The breaks reduce production and the pleats cause wreckage because the 15 tracks will have to be cut later.

It is an object of the present invention to provide an arrangement and apparatus for a fibrous web machine which is simple in structure and function and which securely secures the edges of the web to the support surface and also prevents stretching of the edges of the web. The features of the arrangement according to the invention are set forth in claim 1 and device 10.

In the invention, at least one web of a fiber web machine is

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Blowing means are provided for supporting export, in order to form blows V directed at the periphery of the web. By blowing, the edge of the web is securely held against the support surface and thus prevents the web from being released from the support surface, especially in its peripheral areas. As an exemplary embodiment m of the invention, the fiber web machine oo may be mentioned

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co intervals of the upstream end of the drying section, and especially the first group interval. Another application position is the flow of the web 35 at the beginning of the drying section immediately before the first drying cylinder on the underside of the drying fabric. Thus, the support export can be straight or curved. In addition, the invention can also be applied to 3 press or dryer sections in which the web is supported only by one surface, for example by a felt, a metal belt or a roll.

The blowing means by which the invention can be implemented can be a surprisingly simple entity. According to one embodiment, the blowing means may be formed, for example, of at least one elongated tube component provided with a blowing arrangement in the longitudinal direction of the tube component to form blows 10. For example, a blow damper may be used in place of the pipe component. Thus, the arrangement and device are very simple in design and function and reliable in operation.

According to one embodiment, the blowing means may be provided with 15 actuator mechanisms. It allows you to move them to export and also remove them from export. Thus, the arrangement and device are not susceptible to interference, and the blowing means are even self-guided to be removed from the support port in the event of a malfunction of the fiber web machine or the threading of the head.

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With the invention, the fiber web machine can be driven using a low tensile differential and / or high travel speed and / or lower tensile strength ratio. In addition, the invention also saves the need for pulp milling energy. Other advantages of the invention will be apparent from the description and features of the appended patents.

1- Requirements.

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The invention, which is not limited to the following embodiments, will be described in more detail with reference to the accompanying drawings, wherein

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Fig. 1 illustrates a prior art problem of σ> o behavior of the edge of a web with a drying section of a fiber web, 35 Fig. 2 shows a drying section of a fiber web machine and exemplary positions for the arrangement, 4

Figure 3 shows the beginning of the drying section of Figure 2 and some examples of the location of the arrangement,

Figure 4 illustrates an embodiment of the arrangement in perspective view,

Figures 5a to 5c show an example of the embodiment of Figure 4 viewed in principle from different directions,

Fig. 6 shows an embodiment of the actuator mechanism of the blowing means and Fig. 7 shows an example of a blowing component and its end structure.

Figure 2 is a plan view showing an example of a drying section 38 of a fiber web machine viewed from the side. 15 The fiber web machine may be, for example, a paper or board machine, a pulp machine or a pulp machine.

A hood 14, shown in dashed lines, is provided in principle around the drying section 38, the main purpose of which is to prevent heat escaping. The drying section 38 has successive drying groups 16.1, 16.2, 16 arranged inside the hood 14.

Drying group 16.1, 16.2, 16 comprises cylindrical machine parts rotatably supported at both ends of the forming machine. Such a machine part shows in Fig. 2 the drying cylinders 18 ', 18 for drying the web and the turning rollers 19. The drying part 38 of the forming machine of Fig. 2 comprises seven o V consecutive drying groups 16.1, 16.2, 16. The drying groups 16.1, 16.2, 16 in this case all are single wire exports. Here, g 30, each of the drying groups 16.1, 16.2, 16 consists of alternating vacuum cylinders 18, 18 'and oo 2 arranged on different levels LO acting as rotating rollers 19 through which σ> § is supported to pass as an endless loop one

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a drying wire 23.1, 23.2, 23 for carrying the web. The drying group 35 16.1, 16.2, 16 is defined by the drying fabric cycle 23.1, 23.2, 23.

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When the web to be fabricated on the fiber web machine is introduced from the machine section 28 preceding the drying section 38 to the beginning of the drying section 38, it is guided to a closing friction formed by the first drying cylinder 18 'and the drying wire 23.1. In other words, the web presses against the hot outer surface of the diaper 18 'of the dryer roll. Next, the drying wire 23.1 rotates the vacuum roll 19 whose vacuum effect, together with the pocket space vacuum box (not shown), extends through the drying wire 23.1 into the web, keeping the web under control until the next closing poke. Thus, the web 10 is passed through successive drying groups 16.1, 16.2, 16 while the web is drying. At least a portion of the drying groups of the dryer section 38 may also be double-wire inlets (not shown). In this case, there are hot drying cylinders in the upper and lower rows of the drying group.

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The drying section 38 of Fig. 2 may have at least one web export provided as a support spacer 10.1, 10.2 from one surface only. In the support passage 10.1, 10.2, the web is without mutual support. Thus, in the support flange 10.1, 10.2, the web 20 is guided unilaterally in the machine direction against the support surface 18.1, 23.1. Without mutual support, the web can also live in the cross machine direction.

Figure 3 shows in more detail the initial ends of the drying section 38 of Figure 2 in a rough diagram. Now with reference numbers 10.1 and

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^ 10.2 refers to two unilaterally supported exports. The first of these ports 10.1 precedes the first V-dryer cylinder 18 'of the drying section 38. Here, the web is passed through a dryer

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23.1, supported by runnability components, such as blower x £ 30 chute boxes 39 (Applicant's PressRun designation). The runnability components 39 may be based, for example, on a web of tissue

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cd 23.1 to form a stable vacuum. Thus, in the first insertion 10.1, the supporting fabric 23.1 is on the upper surface of the web c1 and the insertion 10.1 closes in the closure fitting formed by the fabric 23.1 and the drying cylinder 35 '. The second export 10.2 is between the first and second drying groups 16.1, 16.2 6 (inset 3 and fig 4). Here, the final drying cylinder 18.1 of the drying group 16.1 serves as an export of the web W. The outlet 10.2 is unidirectionally supported by a 5 opening opening 22 formed by a drying cylinder 18.1 and a guide roll 29 adapted to pass through it.

As can be seen from the inset of Fig. 3 and Fig. 4, the drying section 38 is fitted with at least one unilaterally supported support inlet 10.2, which in this case is a spacing, blowing means 10 12. Figures 5a-5c show the embodiment of Fig. 4 As can be seen in the figures, the blowing means 12 are adapted to form blows 20 directed to the peripheral area 13 of the web W. Blows 20 formed by the blowing means 12, formed by air or other gaseous media 41 and suitably directed to the surface W of the web Detaching the W edges 13 and thereby holding the W edges 13 of the web onto the support surface of the drying cylinder 18.1. At the same time, the stretching of the edges 13 of the web W due to the release 20 is also prevented.

The blowing means 12 may, in their operating position, be spaced apart on the web W and thus also on the drying cylinder 18.1 serving as a supporting surface. Thus, the blowing means 12 are outside the tissue rotations 23.1, 25 23.2, 23. Blowing means 12 improves fiber

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In addition, the draw difference between the drying groups 16.1, 16.2 o V can also be reduced, since the blade 20 of the web W is confidently adhered to the support surface 18.1.

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cd According to one embodiment, the blowing means 12 may comprise at least one elongated tube component 15 which may be

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mainly adapts the support export to 10.2. Within the drying section 35 38, the tubular component 15 is curved with a radius of curvature slightly greater than that of the drying cylinder 18.1. Of course, a pipe component 15 of radius of curvature corresponding to cylinder 18.1 or even slightly smaller may also be possible. The tubular component 15 functions as a kind of manifold fitted with a blowing arrangement 27 arranged in the longitudinal direction of the outlet 10.2 and hence the tubular component 15 5 in at least one row arrangement (Figure 7). The blowing arrangement 27 is fitted to the tube component 15 such that, when the tube component 15 is in its operative position within the array, the blowing arrangement 27 is directed to the peripheral area 13 of the web W to effect blows 20 thereto. Such a tubular component 15 of simple construction and shape can be readily arranged in a narrow one-sided export 10.2. The elongated tubular component 15, adapted to the edge region 13 of the web W and in the form of an export 10.2, is also easily displaceable from the connection of the export 10.2, for example in the event of a web break.

According to one embodiment, the width (Figure 5a and 5b) of the impact area 13 of the blows 20 from the edge 13 'of the web W may be, for example, 20 mm to 250 mm. Thus, depending on the machine width, the impact area 13 of the blows 20 may be, for example, 1 to 10% of the total width of the web W. The problem that is solved by the arrangement typically occurs right along the edge region 13 of the web W. Therefore, there is no need to push the blow pipe 15 very deeply into the support port 10.1, 10.2 in the cross machine direction which

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^ also contributes to facilitating the arrangement of the stiff support outlet 10.1, 10.2 and the removal of the pipe component 15 from the o support support outlet 10.1, 10.2 in the event of any malfunction.

^ or in the posture of the head. When in use, the web W

x £ 30 the elongated blowing tube component 15 in the running direction is m in the transverse direction of the machine at a distance from the edge 13 'of the web W.

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The dimensioning and operating parameters of the blowing means 12 can be determined by application, for example, through simulations 35 and / or through trial and error. According to one embodiment, the pressure of the blowing medium 41 fed to the tubular component 15 and directed from the blowing arrangement 8 to the surface of the web W can be from 10 kPa to 1.0 MPa, more particularly from 20 kPa to 0.8 MPa, such as 0.6 MPa. At a low pressure, for example 20 kPa, and with a large blowing tube 15 (e.g. 3 mm) 5 with a nozzle 27, the blower air 41 can be used as a medium. Similarly, with small nozzles 27 (e.g., 1 mm), compressed air of, for example, 0.2 MPa can be used as the blowing medium 41. The blowing angle 20 of blows 20 directed to the surface of the web W by blowing arrangement 27 (Fig. 5a: from the plane defined by the smallest distance d of the pipe component 15 to 10 W) may be 35 ° to 75 °, more particularly 50 ° to 70 °. °. In this case, the blows 20 are directed obliquely outwardly from the outlet 10.2 in the transverse direction of the machine. The distance D (Fig. 5a) of the blowing means 12 from the surface of the web W may be 10 to 15 80 mm, more particularly 20 to 60 mm, such as 40 mm.

The diameter of the tubular component 15 may be, for example, 8-50 mm. The curved blowing arrangement 27 may consist of a plurality of discrete openings fitted to the tube component 15. The openings 20 27 may be, for example, circular, oval or slit. Special nozzles may also be provided in the apertures 27 to provide, for example, a fan-like and thus wide and comprehensive blowing of the blowing medium 41. The apertures 27 may, for example, be spaced 20 to 40 mm apart. Such a tubular component 15 with openings 27 is very simple to manufacture. In addition, the curved tube component 15 also allows the blows 20 to partially overlap. In this case, the distance between the openings 27 in the pipe 15 can be reduced ^ and can be achieved even with a smaller amount of air / pressure.

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Lo Fig. 6 shows an embodiment of the device 40, which is exemplified as S in connection with an outage or a headlamp, which can be moved out of the connection O) § with the support outlet 10.1, 10.2. To this end, it is possible to provide the tubular component 15 of the device 40cj with, for example, a pneumatic actuator mechanism 25 for transferring it to the outlet 10.1, 10.2 (operating position) and correspondingly removing 9 from the outlet 10.1, 10.2 (intermittent position). According to one embodiment, the actuator mechanism 25 may include an overload protector 26 for removing the tubular component 15 from the connection of the support outlet 10.1, 10.2 in the event of a malfunction or head-up.

As shown in Figure 6, the actuator mechanism 25 may be, for example, a dual-acting pneumatic cylinder 31 having a tubular component 15 mounted on the end of the piston rod 34. The cylinder 31 may be pivotally pivoted relative to the piston rod 34. According to one embodiment, the overload protector 26 may consist of a slot 35 disposed on the piston rod 34, a latch 33 which fits on the tip portion of the slot 35 and a loading spring 15 disposed on the opposite side of the cylinder 31 relative to the latch 33.

When the tubular component 15 is in connection with the support outlet 10.1, excess pressure is maintained in the cylindrical part 31.1 of the cylinder 31 or there may also be a spring. The spring 32 presses the actuator package 31, 34 20 and especially the handle 34 against the latch 33. As the load F increases, for example as a result of the web formed in a stalled condition, the actuator assembly 31, 34 pivots with respect to the pivot point 36 and consequently the shaft 34 and latch 33 lose their mechanical, sliding lockable slot nail contact. 25 Overpressure charged to cylinder member 31.2 on piston rod side 34

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^ moves the nozzle assembly 15 to a safe distance from the outlet 10.2. Suutinrakennelma 15 can move the arm 43 of the linear V o go back to export 10.2 of the cylinder 31 the fulcrum 36 side of the cylindrical part 31.1 ^ charged under pressure, which affects

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£ 30 to piston 37. When the nozzle assembly 15 reaches its operating position, m the tip of the latch 33 rests in the slot 34 on the arm 34 with a spring 32 oo

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cd due to load. The actuator mechanism 25 with overload or protection 26 is very simple in construction and

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operational reliability.

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Fig. 7 shows an embodiment of a pipe component 15 with a blowing arrangement 27. The blowing arrangement may be formed, for example, by a plurality of blowing openings 27 arranged in a row formation 17 in the longitudinal direction of the pipe 15, i.e. As shown in Figure 7, according to one embodiment, the apertures of the blowing arrangement 27 may be provided in the pipe component 15 at least one, or even here, even in several rows 17, 30. If the blowing arrangement 27 is in two or more rows 17, 30 for example, with two parallel blow pipes 15), for example, different pressures and / or hole sizes can be used in the blow openings 27 of the different rows 17, 30. Similarly, pressures and hole sizes may also be different in the direction of export 10.1, 10.2. A preferred embodiment is one row of holes 15 17 with the same pressure and hole size.

Furthermore, the blowing angles alr a2 of the apertures 27 between the different rows 17, 30 may differ from each other. Thereby, in the direction of the exits 10.1, 10.2, every second blow opening may blow the medium 41 20 into the web W at a first angle? A and every other blow opening at a second angle? 2. Thus, a smoother blowing effect is obtained on the web 13 edge which covers a larger area of the web W edge.

According to the embodiment shown in Figure 7, the tube component 15 is

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g may also be provided with at least one end design 21.

The end design 21 may be, for example, a spherical surface having a blowing arrangement 27 disposed obliquely toward the flange 22, 24. According to one embodiment, at least x £ 30 of the tube component 15 facing the flange 22 may be provided with m blows 20. This is already ensured

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co retaining the support 13 of the web W on the support surface.

Blowing 20 may be directed to equally opening flap 22

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in addition to or instead of a closing kit 24.

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In addition to the arrangement, the invention also relates to the blowing means 12 itself, which is adapted to form blows 20 directed to the peripheral area 13 of the web W and which is adjustable by a fibrous web machine against. The device 12 is very simple in structure and function and is easily retrofitted, for example, to existing fiber web machines.

The invention further relates to a method on a fiber web machine. The method initially comprises a threading, in which the headband tin strip is applied to a full-width web W for production. After the head insertion, at least one unilaterally supported support outlet 10.1, 10.2 of the fiber web machine is provided with blowing means 15 (at both edges). Once the blowing means 12 has been brought into place at the support outlet 10.1, 10.2, blows 20 are initiated by supplying blowing medium 41 to blowing means 12. when the device 12 is at its blow point in connection with the support outlet 10.1, 10.2.

In the pilot phase tests, it has been found that the arrangement arranged in the first group gap allows the edges of the web W to remain ci-j-1 in the cylinder 18.1, even for the next group gap.

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, with drying cylinder. Thus, it is sufficient that the arrangement may be 0 arranged at only one point in at least a portion of the drying groups 38 ^ of the dryer section and provide an effect of £ 30 covering the entire dryer section. For possible problem positions, the device can be installed g later in the group interval or in the web processing device, co co such as the drying section calender.

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It is to be understood that the foregoing description and the accompanying drawings are intended only to illustrate the present invention. Thus, the invention is not limited to the embodiments set forth above or as defined in the claims, but many variations and modifications of the invention which are within the scope of the inventive idea defined in the appended claims will be apparent to those skilled in the art.

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Claims (10)

An arrangement in a fiber web machine, comprising - at least one support guide (10.1, 10.2), wherein the web (W) is arranged to run supported on one side on a support surface (18.1, 23.1), - blowing devices (12) arranged to at least a support guide (10.1, 10.2) for forming blows (20) directed to the edge area (13) of the web (W), which blowing devices (12) are in the transverse direction of the machine in the area of the web (W) and the support surface (18.1, 23.1) - the blowing means (12) are mainly arranged in the shape of the support guide (10.1, 10.2), characterized in that the edge area (13) of the web (W), to which at least part of the blowing means (20) is directed, is an area arranged against the support surface (18.1, 23.1) between the blowing devices (12) and the edge (13) of the web (W) in the transverse direction of the machine. 20. A blowing arrangement (27) has been arranged in the running direction of the web (W) for the blowing devices (12). of blisters (20) which adhere to the web (W) edge area (13) on the support surface (18.1, 23.1). 2. Arrangement according to claim 1, characterized in that the c blowing means (12) comprise at least one elongated c \ i, pipe component (15), on which a longitudinal direction in the longitudinal direction of the pipe component (15) is arranged. 27) for forming blisters (20). 1 30 3. Arrangement according to claim 1 or 2, characterized in that the CO cd blisters (20) are arranged to pavement the web area (W) and edge area (13), the width of which is 0 - 250 mm from the edge C \ J (13). '). 35 Arrangement according to any of claims 1-3, characterized in that - the pressure of the blowing medium (41) is arranged to be 10 kPa - 1.0 MPa, 5. the blowing angle (a) of the blowing means (20) is arranged to be 35 ° - 75 °, the distance of the blowing devices (12) from the surface of the web (W) is arranged to be 10 - 80 mm. Arrangement according to any of claims 2-4, characterized in that the diameter of the pipe component (15) is arranged to be 8-50 mm and the blowing arrangement (27) comprises a plurality of discrete openings arranged on the pipe component (15), the distance (d) of which is each other is 20 - 40 mm. 15 Arrangement according to any of claims 2-5, characterized in that the pipe component (15) is provided with at least one end shape (21), to which the arranged blowing arrangement (27) is directed obliquely to the gap (22, 24). 20 Arrangement according to any one of claims 1-6, characterized in that the arrangement comprises an actuator mechanism (25) for moving the blowing devices (12) in connection with the support casing (10.1, 10.2) and away from the connection of the support casing (10.1, 10.2). ). c \ j δ Arrangement according to Claim 7, characterized in that the actuator mechanism (25) comprises an overload guard (26) for removing the blowing devices (12) from the x 30 connection of the support bushing (10.1, 10.2) e.g. in case of m interference situations or when pointing. co CD O) Arrangement according to any one of claims 1-8, characterized in that the blowing devices (12) are provided with blowing arrangements (27), arranged in at least two in relation to blowing angles (innumerable ot2) from different positions (17, 30). A device which can be arranged in connection with the support guide 5 (10.1, 10.2) in a fiber web machine, wherein the web (W) is arranged to run supported on one side of a support surface (18.1, 23.1) and the device (40) is one in substantially adapted to the shape of the support guide (10.1, 10.2) of the blowing device (12), with which it has been arranged to create blows (20) directed to the edge area (13) of the web (W), characterized in that it extends to the blowing devices (12). The running direction of the web (W) is provided with a blowing arrangement (27) for forming blows (20) which adhere the edge area (13) of the web (W) to the support surface (18.1, 23.1). C \ J δ CvJ ό CvJ X X Q. LO CO CO CO o o o CvJ