FI119388B - Arrangement and procedure for tip drawing in a tape calender - Google Patents

Description

119388 CONVENTION AND METHOD FOR STRAP CALENDAR IMPORTATION

The invention relates to an arrangement in a strap calender threading, the strap calender comprising 5 - at least one roller, - a strap arranged in partial contact with the roller, and - means for inserting the threading strap used in the headstrap into the closure friction forming the roller and belt.

The invention also relates to a similar method for inserting a belt calender head.

In web forming machines, such as paper or board machines, a head starter is used to start production, in which the web cut head is passed through a forming machine. Usually, the threading is divided into different stages, where, for some reason, the threading can start at that stage. One of the production steps used is calendering, in which the dried web is modified.

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Generally, the calender has at least one nip formed between two rolls. By adding rollers, more nipples are provided. However, such calendars have limitations and • ·. ·,; it is difficult to adjust. Thus, a so-called • · * 25 belt calender has been developed in which a long • · is formed between the roll and the belt. . muokkaantumisalue. The web is guided between the belt and the roll, where • * · ***. ' especially the surfaces of the web are modified. The length and pressure of the working area • · · can be adjusted. In addition, * · * ··· 'belt calender is suitable for thick paper and board grades, which would be difficult, often even impossible, to calend with conventional calendars.

V: Calendering thick grades of paper and board with a belt * *. ***. however, the lantern has problems, especially when it comes to threading • · ·. *, 35. With known devices, the threading strap can be inserted with reasonable accuracy into the closure •• M1 formed by the belt and roll. However, the threading strap usually goes multiple times in the friction, causing permanent deformation of the belt and even the roll 2 119388. A damaged belt marks the calendered web, which degrades the quality of the end product. In addition, deformations lead to premature belt change.

It is an object of the invention to provide a novel arrangement of the belt calendars with a simple and reliable operation. It is a further object of the present invention to provide a novel method of inserting a strap calender into a threaded closure closure that has different thicknesses of threads. which, however, are placed and used in a new way. Regardless of the components selected, the threading is always done in the same way, which increases the likelihood of success and facilitates control of the mediation. The method also avoids belt damage and can be used with thick paper and board grades of even thickness.

· * · *; The invention will now be described in detail with reference to the accompanying drawings illustrating some embodiments of the invention, where:. *. 25 t «* ·» · ·. ·. Figure 1 shows a first embodiment of an arrangement according to the invention in connection with a belt calender.

Figure 2 illustrates another embodiment of an arrangement according to the invention. in connection with the belt calender, Fig. 3 shows a third embodiment of the arrangement according to the invention in connection with the belt calender, • * ί.ί, ϊ Fig. 4 shows a fourth embodiment of the arrangement according to the invention in the belt calender, ·! j Figure 5a shows the start of the threading strap, • ·· 35 Figure 5b shows the start of cutting the strap,

Figure 5c shows the guiding of the threading strap after cutting.

• · 3 119388

Figures 1-4 show various embodiments of an arrangement according to the invention. Here, the belt calender is disposed after the drying section, and the web 10 follows a production path which is represented by a solid line. From the dryer section, only the last 5 drying cylinders 11 and 12 are shown, which are part of the so-called twin-wire outlet. Similarly, in a single wire feed, the lower cylinder would be a pivot cylinder. The progress of the threading strap 13 at the start of the threading is shown in Figures 5a-5c. Generally, the belt calender includes at least one roll 14 and a belt 15, which is in partial contact with the belt, which is usually metal. Here, belt 15 is supported by four folding rollers 16. Various applications of the belt calender and belts are described, for example, in WO0 / 06/034761. Further, the belt calender includes means 17 for inserting the threading ib 13b used in the threading into the closure kit 18 forming the roll 14 and the belt 15. According to the invention, the means 17 include means 19 for lowering the threading strap 13 before the belting calender. Hereby, the tensioning strap can be kept under control and accurately inserted into the closure fitting 18. The means 17 may vary in different applications, but in any case the means 19 include tensioning means for tightening the tensioning strap 13 during shutdown.

In practice, the clamping means may be a vacuum cleaner or a water jet 21 • · .... i in pulper 22. Also, the members 19 may be provided with a blow that holds:. 25 threads tight during cutting. Starting a head export-

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,. ·. 5a to 5b.

• · * • · · ti »* * • ·

In Fig. 5a, the threading strap 13 is already tightened. Then it will. . partially detaches from the surface of the drying cylinder 12 and goes directly t (30 down to the pulper (not shown). In practice, the threading strap • · **; · * is previously cut with a drying section and is removed here from the surface of the drying cylinder 12 by a scraper 23. includes mechanical cutting means 24 for cutting and inserting tinskin 13 simply * * * 35 to the means 17 and further to the fist 18. Mechanical cutting means securely secures the tongue strap In addition, the arrangement of the invention securely holds the tongue strap and before everything from a simple strap to a closing caliper of the strap calender, where the success of the head strap is almost certain, while avoiding damage to the strap calender.

5 The mechanical cut-off device can be implemented in many different ways. However, the cutting means 24 preferably includes a pivotably supported cutting blade 25 and a corresponding counter blade 26. With two blades, the thickest threading strap is securely cut. In addition, reversibility offers other benefits, of which later will be elaborated.

The arrangement and method according to the invention are used in particular in threading the belt calender. In particular, a belt calender equipped with a metal belt is virtually impossible to open during export of head-15. In other words, the belt calender has a production load during the head extension. In this case, it is a priority to avoid the multiple thread strap getting caught in the closing friction. Thus, the method involves inserting the threading strap used in the threading into the closure kit. According to the invention, the threading strap 20 is folded down before the strap calender and the threading strap is cut off before proceeding with the threading. This results in: ***: clear steps that are easy to automate. In addition, • ·: * ·, * the threading strap remains in control at all times and the threading • * · ...: start can be accurately determined.

• ·:. ·. 25 • * II * ·,. ·, Figure 1 shows how to start the threading. According to the invention, • · · ···, ·· *, the threading strap 13 is tightened when lowered and the tensioning strap 13 is cut when it is tensioned. In picture 1. the threading strap 13 is tensioned against the means 17 and is guided down to the pulper 22. In Figures 1-4, the threading strap 13 i * *; · "is shown with a dashed line. According to the invention, the means 17 also include at least one blow plate 27 , vacuum belt conveyor 28

Itt and / or rope outlet 29 fitted in the solution means 24. : after. Figure 1 illustrates a so-called cordless export, in which the? 35 bobbin thread 13 is conveyed by blowing plates 27 and / or vacuum belts conveyors 28. The cordless baiting also requires the head bobbin to be shut down after the belt calender and • • 5 119388 new cuts. Thus, if necessary, the headband is also folded down after the belt calender and the headband is cut off before proceeding with the head extension. To this end, the arrangement includes threading means 35, which may consist of components 5 similar to the aforementioned members. In this case, even after the belt calendar is closed, you can cut off the neat end of the headband and move it forward in a controlled manner. The strap may follow the strap as it comes out of the nip. However, the arrangement includes blowing means for detaching the strap from the belt and guiding it back to the roll and further down. The blowing means are shown in Figures 1, 2 and 4 under reference numeral 36. In the downstream shutdown, the drying cylinder 12 of Figures 5a to 5c would be a belt calender roll 14. Unlike the embodiments shown, the roll may also be above the belt. The threading strap 15 would then preferably be detached at one of the folding rollers.

Also, the threading after the belt calender may be by blade plates with rope reel or cordless export by belt conveyors or by blower plates. 1-4, the vacuum belt conveyor 28 is illustrated with a rounded rectangle at its ends and blow plates 27 with a rectangle, respectively. Depending on the application, the size, shape, and number of components may vary. Also • · ····! different components can be chained in a very versatile way: 25 ti. The device formed by blowing plates is also called. . ·. called "tail shooter". In Fig. 1, the threading strap 13 is conveyed to a closing piston by two successive vacuum • belt conveyors 28, preceded by a single short blow blade 27. The arrangement may use, for example, the vacuum pressure shown in WO 0/018909. or the "tail shooter" device disclosed in WO-A-2005/003453.

The short blow blade 27 described above is present in all shown,. : in applications and also includes a counter blade according to the invention • ·· • · 26 26. In this case, after cutting off, the headband immediately starts in the right direction and is sure to move to the next medium. According to the invention, the threading strap 13 is cut one at a time across its width and the threading strap 13 is guided simply forward. In practice, cutting means 24 is used for cutting the threading strap 13, which includes a cutting means 33 in two stages, first to cut the straping strap 13, and then to guide the straping strap 13 in the direction of the threading. 5a-5c. In the examples, the cutting blade is part of the cutting element. After cutting, the threading strap is guided by means toward the closing fossa. Preferably, the pre-sheath device is fitted as deep as possible into the sheath. In this case, the strap will surely remain up to the simple pith without damage to the belt calender.

Figure 3 shows a rope passage 29 with a belt calender. In such a case, it is unnecessary to disassemble the threading strap after the belt calender because the rope threading 2 9 continues after the belt calender. On the other hand, if the cable entry ends on the belt calender, the threading can be implemented, for example, as shown in Figures 1 and 2. The ropes 30 and 31 used in the cable entries 29 are referred to by the same reference numerals 20 in the various figures, although their placement varies. In other respects, functionally similar devices are referred to by the same reference numerals. In the rope feed, the headband is guided to a rope nipple formed between the two ropes.

• Φ After this, the end of the strap passes along the ropes:. 25 until the end of the export. The ropes are placed in a web formation

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, to the outside of the production area. Although the end of the headband may be • double the length of the cable entry, it will simply go into the belt calender. This is because,. the double portion is out of the belt calender, more specifically • · **] j '30 belt.

In Fig. 3, the threading strap 13 is inserted by a single vacuum conveyor 28 between the ropes 30 and 31. Vacuum conveyor can be.). also uses over-speed as compared to the headband • ·· 35, which quickly tightens the headband. At the same time, the tensioning ribbon 13 approaches the paper guide roller 32 and loosens more and more from the surface of the drying cylinder 12. In the embodiment of Fig. 4, two successive blowing plates 27 are used at the respective point 7 119388. In addition, the rope feed 29 terminates immediately after the belt calender. In Figure 4, the strap calender threading is successful and the strap-tin strap 13 is lowered downstream of the strap calender. From this extension of the headband-5, the headband is first tightened, after which it is carefully cut while being guided forward. Here, the threading is continued after the belt calender by a plurality of blowing plates 27. According to an embodiment, the threading strap 13 may be carried on the upper or lower surface 10 of the blowing plate 27, which provides numerous alternatives for arranging.

Accurate clipping in fast threading is difficult. The cutting blade must have a high speed and, on the other hand, be able to stop quickly. According to the invention, the speed of the cutting member 33 is adjusted to its maximum at the cut-off point, after which the cutting member 33 is stopped to guide the threading strap 13.

In other words, the cutting member is accelerated to the intersection and then rapidly decelerated to the guide. Even a light pivoting interval has a large amount of movement due to the high speed. In this case, special arrangements are needed for the controlled deceleration of the cutting element and for keeping it in place. According to the invention • · · '1,! the cutting member 33 is stopped by a damping which is adapted * · to move the cutting member 33 into the fitted member 34.

• ·:, ·, 25 In practice, the actuator can be driven at maximum power towards the end-

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, · However, the position is reduced by slowing the cutting blade * 1 «at the end of the movement. At the same time, the actuator holds the • • cutting blade and its cutting blade in place without adverse vibration. until the cutting element is rotated back to its original position.

• · · 30 Attachment damping simplifies the structure of the device and reduces the strain on the various parts.

• ·:.: T: Preferably, the actuator is a pneumatic cylinder.

«1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · The headband is then passed through the roller to the next stop, after which the belt is moved back. Belt Moving 8 119388, however, complicates the strap calender structure and may cause the headband to break when moving the belt. Nonetheless, headaches are even more successful.

According to the invention, the method according to the invention can be applied to very different belt calendars. There are clear steps in the method that make it easier to control the headstroke. In addition, the arrangement of the invention is suitable for all thicknesses of paper and board. Precise and controlled trimming of the strap as well as simple export of the strap to the closing kit is essential. In this case, the threading strap proceeds smoothly without damage to the belt or roller.

M · • f · t · • • • • • · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · • t ··· 9 * 9 9 9 9 9 9 9 '* * ·· • · · ··· * • * * «* • t» • · M · • · • «··· t · • · · • · * • · • 9

Claims (12)

Arrangement for tip drawing in a tape calender, the tape calender comprising 5 - at least one roller (14), - a metal tape (15) arranged in contact with the roller (14) during part of its circulation, - devices (17) for inserting the tip pulling band (13) used in the tip drawing into a slot (18) which interlocks between the roller (14) and the belt (15) and which means (17) comprise means (19) for driving down the tip drawing belt (13) before the band calender and for cutting the tip pulling band (13), characterized in that the means (19) comprise mechanical cutting devices (24) for easily inserting the tip drawing band (13) into the devices (17) and further into the gap (18), and the devices ( 17) has been arranged as deep as possible in the gap (18) where the tape calender is at production point loaded at the tip. 2. Arrangement according to claim 1, characterized in that the means (19) comprise stretching means (20) for:. stretch the tip pull belt (13) during the run-off. • «* • · • ·. . 3. Arrangement according to claim 1, characterized in that the cutting devices (24) comprise a rotatable cutter cutter (S) (25) and a countercutting cutter (25) corresponding to the cutter. • t • t ·· ·. 4. Arrangement according to any of claims 1-3, characterized by • · · I .; in that the devices (17) comprise at least one blow plate plate; 30, a suppressor conveyor (28) and / or a rope thread iV: (29). ·· * • '· t · ··· * ί 5. Arrangement according to any of claims 1-4, characterized in that the arrangement comprises tip-pulling devices 119388 (35) for driving down the tip-pulling band (13) after the band-chandelier and for cutting the tip-pulling band (13). The method of tip drawing in a tape calender, according to which method the tip drawing tape (13) used in the tip drawing is fed to a closing gap (18) formed by a wire cage (14) entering the tape calender and a metal tape (15). , which is arranged in contact with the roller (14) during a portion of its orbit, and according to which the tip-pull band ίο (13) is run down before the band calender, and the tip-pull band (13) is cut prior to the continuation of the tip-drawing, characterized in that the tip-pull band (13) is cut. on a thread along its entire width and the tip pull band (13) is easily controlled further as deep as possible in the gap (18), and that the tape calender is poured into ice production load during the tip drawing. Method according to claim 6, characterized in that the tip-pull band (13) is run down after the tape calender, and the tip-pull band (13) is cut prior to the continuation of the tip drawing. ·· · • · · • · *. *. Method according to claim 6 or 7, characterized by * * ··! that the tip pull belt (13) is stretched at the descent and • ·. . the lace pull band (13) is cut when stretched. ♦ · · • ♦ · ** ·. · 25 ♦ · · • · I c ** 9. Method according to any of claims 6-8, characterized in that cutting means (24) are used in the cutting of the tip pulling belt (13) t #, whose input cutting means • · · * ·) * (33) is used in two steps, first for cutting the tip-pulling band (13) and then for controlling the cut tip-pulling band (13) in the direction of the tip-pulling. . ··· • «·. ·. j Method according to claim 9, characterized in that the speed of the cutting means (33) is arranged to its maximum at the cutting point, after which the cutting means (33) is stopped for control of the tip drawing belt (13). 119388 Method according to claim 10, characterized in that the cutting means (33) is stopped with a damping, which is arranged to the actuator (34) arranged to move the cutting means (33). 5 Method according to any of claims 6-11, characterized in that at the beginning of the tip drawing, the strip (15) is moved in the lateral direction and the tip drawing strip (13) is moved via the roller (14) to the next descent point, after which the strip (15) is moved back. · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ♦ · ··· ·· · • · * · • · • I «• 1 · ♦ · ··· • · ♦ · * ·· • · · · · · · · · · ··· • t • · ···« • · • · · · · ·