FI125381B - Arrangement and arrangement in a drying section of a sheet forming machine for control of air flows during tip drawing - Google Patents

Description

APPARATUS AND DEVICE ON A DRYING MACHINE DRYING PART FOR CONTROLLING HEAD-ONE-TIME AIR FLOWS

The invention relates to an arrangement on a drying section of a forming machine for controlling airflows during head-tapping, in which the tapping section is arranged at several points on a tongue-in a drying cylinder, two lower plane swivel rolls and a wire arranged therethrough, the underside of which is a threading strap adapted to pass from the drying cylinder beneath the swivel roll, supported only by a negative pressure wire; the vacuum together with the vacuum of the swivel roller is adapted to control the head passage of the gingiva from the drying cylinder to the turning roll, - a scraper fitted in said pocket space.

Further, the invention also relates to a device.

In the papermaking of a paper machine, a significantly narrower filament strap is transported through the machine than the actual production width. For example, the width of the strip may be 100 to 500 mm, while the width of the web may be, for example, 8 to 12 meters. The tape is passed through the machine at production speed. Mainly due to the high machine speeds, the behavior of the headband may be very unstable. For example, the dryer cylinder rotating on the dryer member and the wire arranged to pass therethrough carry air and thereby create a vacuum in the opening friction between the dryer cylinder and the wire. The runnability components in the pocket space between the drying cylinders and the rotating rollers further enhance this vacuum effect. Air is leaking into the pocket space through the wire. The low pressure swivel roller also draws air from the pocket.

When looking at the width of the machine, the effects mentioned above do not cause problems in the center of the machine, since no replacement air can flow from the edges. Instead, there is a strong transverse flow at the edges of the machine, where the headband is generally inserted, due to the inflow of air from the sides of the machine. The higher the machine speed, the stronger the lateral flow. As a result of the phenomenon of head-tin-side edge of the threat could rise up from the surface, or remove the wire. The result is at least stretching of the edge of the threading strap, or even a pleat, both of which can cause a break at some later stage. It is an object of the present invention to provide an arrangement for a drying section of a web-forming machine for controlling airflow during tapping, which, inter alia, improves the reliability of tapping. The features of the arrangement according to the invention are set forth in claim 1 and claim 9 of the device.

In the arrangement according to the invention, the threading strap is arranged at several points in the drying section for insertion into a wire-supported interval from the drying cylinder to the turning roll. The drying cylinder and the wire form a joint that opens together. The kit is adapted to be at least partially covered from the outside of the threading strap to limit the transverse air currents of the machine at the opening of the slide. This prevents, for example, the harmful transverse currents absorbed from the sides of the machine from interfering with the passage of the thread. As a result of the invention, the threading strap remains adhered to the surface of the wire as desired throughout its width and supported portion throughout the wire.

According to one embodiment, the opening opening can be obscured in the transverse direction of the machine, at least in part, from the outside of the treatment side headband. The cover can then be easily attached to, for example, the frame structures of the machine.

According to one embodiment, the opening opening can be covered in the transverse direction of the machine immediately at its opening position. The vacuum effect is most pronounced immediately after the opening of the kid and the subsequent condition, as there may be several factors causing the vacuum to be affected.

The cover member may be provided at one or more alternative positions in the transverse direction of the machine during threading. The blanket may be located at the edge of the threading ribbon, at the edge of the wire, at the edge of the dryer cylinder jacket, or at the end of the dryer cylinder. Various ways of organizing provide ample degrees of freedom for arranging a blanket cover.

The cover may be plate-like or may have an elongated dimension, even in the transverse direction of the machine. It can then be fitted even between the wire and the drying cylinder. For example, the transverse dimension of the mask relative to the plate-like cover member reduces the risk of tissue damage that the cover-like member may have.

Further, the position of the masking member may be variable. In this case, after the head insertion is successful, the cover member can be moved away from the head export position, such as from within the machine. Due to the mobility, any web material that may be adhered to the device will be released and will not be adhered to in the event of breaks during production.

Other additional advantages achieved by the invention will be apparent from the description and the features of the appended claims.

The invention, which is not limited to the following embodiments, will be further described with reference to the accompanying drawings, in which:

Figure 1 is a side view of an arrangement according to the invention,

Figures 2a and 2b show simplifications of some embodiments, seen from above,

Figures 3a and 3b illustrate, in simplified form, another embodiment of the cover member, Figure 4 illustrates conceptual examples of the arrangement seen from above, Figure 5 shows a side view of the carrying member of the cover member, and

Figure 6 shows a third embodiment of the arrangement.

Fig. 1 shows an arrangement according to the invention for controlling the head-flow airflows from a side view of a forming machine, in this case a multi-cylinder dryer of a paper machine. In the context of the invention, the forming machine can equally be understood to be a board machine, a nipple machine or a pulp machine. The figure shows a dryer section 10 of a papermaking machine and two vacuum rollers 11, 12. The dryer section may be a multi-cylinder dryer known per se, in which the order of the rotating elements 10-12 may be reversed as shown in FIG. Here, the drying cylinders are in the upper plane and the turning rollers in the lower plane, and both are in planes numerous in succession. The swivel roll 11, 12 may also be unpressurised and its mode of vacuum is not limited in any way by the basic idea of the invention. In addition, Figure 1 shows, as an accessory for the drying section, the pattern 25 of the drying cylinder 10 and the runnability component 19 shown by the dashed line, which may be known, for example, by the applicant's Hi-Run product designation.

The head-export ribbon 13, which is considerably narrow in relation to the actual production width, may be provided with a dryer section supported in a manner similar to a full-width paper web. The threading strap 13 extends in the region above the drying cylinder 10 between the wire 14 and the jacket 26 of the heated cylinder 10 (Figures 2a, 2b, 3a). In the area below the depressurized swivel roll 11, 12, the threading strap 13 passes to the surface of the wire 14, sucked. The wire 14 is then sandwiched between the threading strap 13 and the diaper of the unpressurized swivel roll 11, 12.

At a plurality of locations on the dryer portion of the forming machine, the tuft-ribbon 13 is threaded during the threading into a wire 14 supported by a gap 16 (Fig. 5) 300 - 1800mm.

In the arrangement according to the invention, the opening opening 15 is arranged at least partially outside the threading strap 13 to cover at least partially to limit the transverse air flows of the machine at the opening opening 15. In other words, the object to be covered is the spacing 16, or at least part of the distance from which the threading strap 13 is supported solely on the wire 14.

Figures 2a, 2b and 3a show some embodiments of the invention. Covering according to the invention in the width direction of the machine may be directly limited to the edge 13 'of the threading strap 13, or on the other hand, only at a distance from the edge 13' of the straping strap 13. The cover member may, of course, extend partially in the transverse direction of the machine, even in the region of the threading strap, but it is still detached from the threading strap to prevent this from being damaged. In any case, due to the cover member, the sides of the dryer section will not allow airflows to flow into the machine that could interfere with the passage or retention of the threading strap 13 in the area of the opening 15 of the wire 14.

The kit 15 can be obscured / closed / covered, whatever expression it is now desired to be used, in the transverse direction of the machine, at least in part, at either of the two edges of the headband 13 but at least at the treatment side 17 of the headband 13 '. The purpose of masking is to cut off, or at least substantially limit, the intense transverse flow of air from the sides of the machine. Since the threading of the threading strap 13 through the machine takes place close to the edge 17 of the treatment side of the machine, the airflows entering the machine thereby affect the said straping strap edge 13 '. In addition, the support of the masking member 18 for covering is easier to arrange on the treatment side 17. If the masking member 18 is of the movable type by the actuator 22 (Fig. 4), the actuating line of the actuator 22 may also be easier to arrange on the treatment side 17.

The gap 16 (Fig. 5) supported on the wire 14 can be closed at the opening of the opening 15, and more particularly immediately from the root of the 15, where the wire 14 and the threading strap 13 for its surface release from the drying cylinder 10. This is where the effect of damaging airflows is the biggest. The adverse effect is further increased by the possible runnability component 19 in the space between the drying cylinders 10 and the rollers 12 and the unpressurized swivel roll 12, which partially absorbs air through the wire 14.

The covering according to the invention may be carried out with a structure which may consist of at least one body. The shape of the cover member 18 in the transverse direction of the machine may correspond to the shape of a mainly opening pin 15. Figure 1 illustrates two possible shapes of the cover member 18, 18 ', the larger in dashed line and the smaller in intact line. In both cases, the cover member 18, 18 'fills the mandrel 15 evenly on all sides, but in such a way that, for example, the drying cylinder 10, the wire 14 or other moving surfaces are not damaged. The cover member 18, 18 'may be curved at the side facing the drying cylinder 10. The covering member 18, 18 'covering the underside of the depressurised rotating roll 12 may be somewhat rectilinear from the base of the mandrel 15 following the path of the wire 14. If the cover member 18 'extends in the direction of the mandrel 15 so that it is also on the pressurized swivel roll 12 with a supported wire portion, the cover member 18' may curve to conform to the curvature of the underpressure swivel roll 12. At its opposite edge to the opening kite 15, the cover member 18, 18 'may be somewhat straight.

According to a first embodiment, the cover member 18.1 may be a planar triangular plate in the width direction of the machine. Such are illustrated in the embodiments of Figures 2a, 2b and 6. Instead of the sheet structure, the cover member 18.2 may also have an elongated dimension in the transverse direction of the machine. An example of such a beam-like cover member 18.2 is shown in Figures 3a, 3b and 6. The triangular cover member 18.2 shown in Figure 3b is cut off by one corner 18 *. With the cover member 18.2 in place, the angle 18 * is transverse to the machine inwardly of the machine. With the removed angle 18 *, the transverse elongated cover member 18.2 can also be removed from the inside of the machine after threading and even allowed for a slight change of position during removal without damaging, for example, the wire 14. The girder cover member 18.2 is also easy to clean and upper tip towards the fist 15.

As shown in Figures 2a, 2b and 3a, the cover member 18.1, 18.2 can be fitted at several different positions in the transverse direction of the machine when the head is inserted. The cover member 18.1, 18.2 may be fitted between the wire 14 and the drying cylinder 10, or even outside the machine, so that it is not even inside the mandrel 15. 2a, the cover member 18.1 is limited to the connection 14 of the care side 17 of the fabric 14. In Fig. 2b, it is outside of the treatment side 17 edge 13 'of the headband tin ribbon 13. 2a and 2b, however, the covering member 18.1 is arranged so as not to impede or damage the passage of the threading strap 13 or the wire 14. In this case, its distance from the movable edge or surface may be from 30 to 100 mm, such as from 40 to 70 mm. The cover member 18.1 may also be adjacent to the rim 26 'of the shell 26 of the cylinder 10 (not shown) or immediately adjacent the end 10' of the cylinder 10, as shown in Figure 4.

Figure 4 is a top plan view of the principal embodiments shown in Figures 2a and 2b. Also shown here is a cover member 18 mounted on the outside of the machine. In addition, the figure shows some possible support possibilities for the cover member 18. The cover member 18 may be secured by a bracket 21 to some suitable machine frame 20, runner component or scraper bar. As shown in Figure 4, the cover member 18 may also be provided with a transfer member 22 for positioning and removing it at the time of head tapping. The transfer device 22 possibly attached to the machine body 20, such as, for example, a linear guide, may be, for example, fluid-driven, such as pneumatic, and its operation may be controlled by the machine's automatic threading. Also, the pivoting movement of the cover member is possible to remove it from its position at the time of tapping. The pivoting movement is more challenging and the top of the cover member 18 may be shaped with rounding to protect the wire 14. The cover member 18 which is removable from the inside of the machine is also easy to clean.

The masking member can also direct the blow-out blow on the scraper to the correct address and also assist in the threading.

Figure 5 illustrates yet another embodiment of the carrier, viewed from the side. The drying cylinder 10 is supported by a bearing 23 on the machine body 20. The cover member 18 is also supported on the body 20 by a support arm 21.

Fig. 6 illustrates an embodiment in which the cover member 18.1, 18.2 is integrated into the thread blowout device 27 of the beam 15, in which an air stream 31 discharged exits the opposite end 30 of the tube (arrows). Fig. 6 also shows schematically the edges 10 ', 14' and 13 'of the cylinder 10, the wire 14 and the threading strip 13. The threading blower 27 detaches the threading strap 13 from the surface of the cylinder 10 and forces it to pass further over the surface of the wire 14 to the pivoting roll 12. The advantage of this embodiment is that it does not require separate brackets;

The embodiment of Fig. 6 can be implemented both by a plate-like masking member solution (shaded section 18.1) and by a masking member 18.2 having a transverse dimension according to the outline. The cover member 18.2 having a transverse dimension is firmly seated in the region of the collar 28. The end 30 of the blowing tube may be shaped to be inclined downwardly to prevent the web / tongue strips from sticking to it and also to fall more easily under gravity. In addition, the application can be implemented as a bypass. This prevents even a larger paper stack or wire breaker from destroying the device 24, but pushing the device 24 out of the way if any memory hits it.

The cover member 18 according to the invention may be, for example, metal, composite or plexiglass, whereby it may even be transparent. The cover plate surfaces close to the moving surfaces may be lined with, for example, Teflon and thus form a sliding surface. In this case, the wire 14 may wear the cover member 18 in its shape, and the cover member 18 may even be attached to the surface of the moving wire 14 without damaging it.

The cover member 18 according to the invention may be provided with the drying member at each opening or at least a portion thereof, such as at the beginning of the drying member. Thus, from the beginning of the drying section, for example, 1/3 of the openings in the drying section can be provided with a covering element according to the invention.

In addition to the embodiment, the invention also relates to a device, the basic description of which is well apparent from the embodiments described above. At a plurality of locations in the dryer section, the threading strap 13 is guided into the wire 14 from the drying cylinder 10 to the turning roll 12. The drying cylinder 10 and the wire 14 form a coil opening 15. The invention 15 is at least partially covered by a coil 15 Coverage may be immediately limited to the edge 13 'of the threading strap 13, i.e. outside the strap 13 or also at a distance from the edge 13' of the strap 13.

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 possible within the scope of the inventive concept defined in the appended claims will be apparent to those skilled in the art.

Claims (9)

An arrangement with a drying section of a forming machine for controlling airflows in the thread-warping process, wherein the threading strip (13) is arranged at several points on the drying section (16) supported on the wire (14) as a drying cylinder (10) on a vacuum pressed ) and the wire (14) form a downwardly opening peg (15) which is adapted to form a top-mounted drying cylinder (10), two lower-level swivel rolls (12) and a wire (14) adapted to pass therethrough, ) is adapted to pass from the drying cylinder (10) below the swivel roll (12), supported only by the negative pressure wire (14) and which further comprises at least one runnability component (19) arranged in the space between the drying cylinder (10) and swivel rolls with the ripple component (19) alip the material, together with the vacuum of the swivel roll (12), is adapted to guide the passage of the threading strap (13) from the drying cylinder (10) to the swivel roll (12), - a scraper (25) fitted in said pocket space from the outside, at least partially, for covering the transverse air flows of the machine at the opening of the spout (15). Arrangement according to Claim 1, characterized in that the kit (15) is arranged at least partially to be covered from the outside of the tensioning edge (13 ') of the treatment side (17) of the drying section. Arrangement according to Claim 1 or 2, characterized in that the covering is arranged to take place by means of a covering element (18, 18 ', 18.1, 18.2), the shape of which in the transverse direction of the machine is adapted to correspond to the shape of a substantially opening pin. Arrangement according to one of Claims 1 to 3, characterized in that the cover member (18, 18 ', 18.1, 18.2) is adjustable in the transverse direction of the machine during threading at least at one of the following, in connection with the edge (13') of the threading strip (13). (14) at the edge (14 '), at the edge (26') of the jacket (26) of the dryer cylinder (10) or at the end (10 ') of the dryer cylinder (10). Arrangement according to one of Claims 1 to 4, characterized in that the cover member (18, 18 ', 18.1, 18.2) can be fitted to the peg (15). Arrangement according to Claim 5, characterized in that the cover element (18, 18 ', 18.1, 18.2) has an elongated extension in the transverse direction of the machine. Arrangement according to one of Claims 1 to 6, characterized in that the cover member (18) is provided with a transfer member (22) for positioning it in connection with the tongue (15) and for removing it from the tongue during the tongue. Arrangement according to one of Claims 1 to 7, characterized in that the cover member (18) is integrated into the thread-blow-out device (27) of the hook (15). Apparatus (24) for controlling the airflow of the headlining during the drying section of the forming machine, wherein the lacing strip (13) is arranged at several locations on the drying section (16) supported on the wire (14) from the drying cylinder (10) to a vacuum and the wire (14) forming a downwardly opening peg (15) adapted to form a top-mounted drying cylinder (10), two lower-level swivel rolls (12) and a wire (14) adapted to pass therethrough, 13) is adapted to pass from the drying cylinder (10) beneath the turning roll (12), supported only by the negative pressure wire (14) and further comprising at least one runnability component (19) arranged in a space between said drying cylinder (10) and the turning rolls (12) vacuum of the runnability component (19) e, together with the vacuum of the swivel roll (12), is adapted to control the passage of the threading strap (13) from the drying cylinder (10) to the swivel roll (12), - a scraper (25) fitted in said pocket space; wherein said opening opening (15) is disposed at least partially from the outside of the threading strap (13) to limit transverse air currents of the machine at the opening opening (15).