FI120006B - A method and system for forming a threading tape on a web forming machine - Google Patents

Description

METHOD AND SYSTEM FOR MAKING THE MAIN TAPE ON A BREAKING MACHINE

The invention relates to a method of forming a threading strap on a web forming machine, in which the strap is formed from the web by cutting the web into three portions which are the first edge trim, the headband and the second edge strip. The invention also relates to a similar system.

From the prior art, there is known a method according to FI 103683 for forming a threading tape on a web forming machine. The threading strap is formed by cutting the web into three sections, which are the first edge band, the thread band, and the second edge band. When cutting the web according to the method into three parts, problems arise especially with thick webs and the breakage of the threading strap is very likely. As a result, machines that manufacture thicker webs, such as cartons, often still use only one-sided threading. However, the problem with the single-sided threading tape is the limited positioning of the threading tape across the web forming machine.

It is an object of the invention to provide a novel method of forming a threading tape on a web forming machine. By the method of the invention, the probability of breaking the threading strap can be significantly reduced and, moreover, the threading strap is formed at a desired position in the cross-machine direction. It is also an object of the present invention to provide a novel system for forming a headband on a web forming machine. With the system of the invention, the threading of the web can be accomplished more quickly when the threading web is more durable and no longer breaks so easily. The features of this invention 35 are disclosed in the appended claim 6. In the method and system 2 of the invention, the first and second edge trims are cut in various machine positions.

The threading tape is formed on a web forming machine, for example, when the web is applied to a finishing section, which may include, for example, pre-calendering, gluing, drying, coating or calendering. It is necessary to form a headband from the web, since it would be very difficult to export the web at full width to the next unit. From the web, the headband is formed by cutting a 10-club web into three sections, which are the first edge band, the head band and the second edge band. Edges of the web are cut off on both sides of the web, forming a threading band in the middle of the web. The edge trims go to the pulp or wreck treatment. The threading strap can be of any width 15 except the edge trim. The threading strap may be located across the web forming machine at any point along the web path. The formed threading strap can be advanced by ropes, blows, supported by a single wire feed or guided by vacuum conveyors. Further, according to the invention 20, the first edge trim is cut earlier in the machine direction of the forming machine, i.e., at an earlier cutting position than the second edge trim. The first edge trim can be formed from either edge of the web, wherein the second edge trim is cut from the opposite edge to the previous one. In other words, the edge trims are cut at different points in the machine direction so that the edge trims have a different lowering position. When cutting edge trims at different cutting positions, i.e. at different points in the machine direction, only one side of the edge trimming is cut in one cutting position, thereby increasing the stability of the web in the threading 30. In this case, the entire import will also be more likely to succeed.

In one embodiment, the first edge trim is cut at the first cutting position and the second edge trim is cut at the second cutting position. In addition, there is at least one roller between the cutting positions. In this case, the cuts are completely separated from each other, whereby the web is completely relaxed between the cutting positions.

In another embodiment, the edge trims are driven down 5 rolls from the next cutting position. The edge trims are then transported as short as possible. In addition, scrapers are connected to the rolls from which the edge trims are driven down to the shelf. A scraper is a mechanically very simple solution for detaching edge trimmers from a roll and guiding them to a wreck concept. In addition, the part of the web that continues its journey from the roll forward is not affected by the scraper.

In a third embodiment, the first edge trim is formed on the service side of the forming machine and the second edge trim is formed on the drive side of the forming machine.

In a fourth embodiment, the edge trims are cut by cutting means, and to extend the threading tape into a collapsible web, the cutting means is driven to the edges. In this case, the application of 20 threading straps is simply accomplished.

The invention will now be described in detail with reference to the accompanying drawings, in which:

Figure 1 is a top plan view of a system according to the invention in which the first edge trim is cut in the machine direction of the forming machine at an earlier cutting position than the second edge trim and the tin rib 30 is formed in the periphery of the forming machine;

Fig. 2 is a top plan view of a second system according to the invention in which the first edge trim is cut in the machine direction of the forming machine at an earlier cutting position than the second edge trim and the tongue 4 is formed in the center area of the forming machine;

Figure 3 is a side elevational view of a system according to the invention in which a threading strap can be cut in accordance with the invention for threading from the drying section to the post-treatment steps and between the post-treatment steps.

Figure 1 illustrates a system 12 of the invention for forming a headband 10 tin strip 10 on a web forming machine. System 12 includes first cutting means 14 for cutting a first edge trim 18 and second cutting means 16 for cutting a second edge trim 20. Hereby, the threading strap 10 is arranged to form between the first cutting means 15 and the second cutting means 16 in the transverse direction of the forming machine. In addition, the first cutting means 14 are earlier than the second cutting means 16. That is, the first cutting means 14 are in the first or former cutting position 15 and the second cutting means 16 20 are in the second cutting position 17. The system 12 also includes guide means 22 having first cutting means 14 and in cahoots with. Advantageously, the control means 22 include calculating means 30 which take into account the machine operating delay. 25 Operational delay plays a significant role in moving the headband crosswise.

In the system 12 according to the invention shown in Fig. 1, the web 28 has already been passed through the adhesive press 29 and subsequent cylinders 25 and spread. The web 28 is then spread wide to the lowering position 26 following the second cutting means 16, thereby forming a headband according to the invention for further guiding the web, for example to calender 31. In the system 35 the first edge trim 18 is formed by the first 5 After cutting 18 of the first edge trim 28, the remaining portion passes through the adhesive press 29. Following the adhesive press, follow the second cylinders 25 and the pivoting roller 27, which are provided with the second cutting means 16. The pivoting roller is shown in the figure narrower than normal, whereby the position of the cutting means is well illustrated. For functionally similar parts, the same reference numerals are used.

In the system 12 of the invention shown in Figure 1, the first edge trim 18 is first cut by first cutting means 14. The cut first edge trim 18 may be severed and dropped immediately from the first lowering means 24 of the first cutting means 14. the second cutting means 16 from the lowering position 26 following. Then the web 28 is formed, i.e. the head-export strip 10 remains.

In the system 12 20 shown in Figure 1, the lowering points 24, 26 are located in connection with the rollers following the cutting positions 15, 17, i.e. the lowering rollers 21, 23.

The first, or earlier, cutting position 15 is followed by a first lowering roller 21 and a second cutting position 17 followed by a second lowering roller 23. The lowering rollers have scrapers for guiding the web from the roll to wreck treatment.

In the system 12 according to the invention shown in Fig. 1, at least one roller 19 is provided between the cutting positions 15, 17.

This roll may be a lowering roll. Preferably, at least one roll 19 in addition to the first lowering roll 21 is provided between the previous cutting position 15 and the second cutting position 17. When there are several rollers, the cuts at different cutting positions are completely separate. This will completely calm the web between the cuts and allow for better threading.

6

In Figure 2, the first cutting means 14 are moved closer to the transverse center of the forming machine than in Figure 1. Thus, the first edge trim 18 becomes considerably wider than in Figure 1. Accordingly, the second cutting means 16 are moved closer to the second edge of the forming machine 20 The threading tape 10 is made wider than that of Figure 1, since the distance between the cutting means in the cross-machine direction is greater than that of Figure 1. In the system of the invention, the threading tape is of a desired width and can be positioned at a desired position on the forming machine.

The cutting means 14, 16 used in the system 12 15 shown in Figure 1 are chamfered, so that the threading strap 10 is cut by two separate chamferers. These bevel cutters are located at some point in the web before the point at which the "double-cut" strip in the various cuts is threaded. The bevel cutters 20 can be of any type as long as they can be used to make a longitudinal machine cut into the web. Such incisors include water, blade, and laser cutters and combinations thereof.

Figure 3 illustrates an arrangement according to the invention which is intended in particular for the online post-processing of a forming machine. the threading of the web-forming machine according to Figure 3, the invention is described beginning from the dryer section 32, which from the web can be run down to the pulper the broke treatment of a downward-pointing arrow 30 and split. Similar positions where the web can be lowered for wreck treatment are indicated by downward arrows. Wreck handling devices are not shown. At the end of the post-treatment, the web is rolled with a reel 40. After the reel, the after-treatment section comprises successive post-treatment steps 35, a pre-calendering section 34 and a coating section 36. In this 42. With the threading means 42, the threading strip formed by the cutting means 14, 16 is introduced into and through the subsequent post-treatment step 5 34-40. The forming of the threading strip 10 from the web 28 (Figure 1) is accomplished by cutting means 14, 16.

In Figure 3, the threading means 42 consist mainly of rope leads, i.e., threading ropes 44, for passing the threading strap at each post-treatment step. The threading means 42 also includes, mainly between the various post-processing steps 34-40, vacuum belt conveyors / bulking scooters 46 for transferring the formed threading belt to the next post-processing threading means, in this case to the threading rope 44 or to the rope. At the other 15 points, it is possible to replace the thread ropes with cordless thread applications. In Figure 3, for the sake of clarity, both the web and the strap are omitted. At each post-treatment step, the cable entries follow substantially the same path as the web production.

20

In the embodiment shown in Figure 3, the precalendering portion 34 consists of two successive so-called soft calenders 48. In these, the calendering nipples consist of a hard roll 50 and a softer back roll 52. In successive soft calenders 48, a softer back roll 52 half are pre-calendered in turn. Further, the soft calendars 48 are further provided with humidifying devices 54 on both sides to adjust the moisture profile of the web as needed. The coating takes place in a nip 56 followed by a drying means 58. Finally, there is a so-called hard calender 60 consisting of a plurality of overlapping rolls between which a plurality of nips are formed. From the hard calender 60, the coated and calendered web is led to a reel 40 having a common rope outlet with the hard calender 60. The devices used in the different post-treatment steps may vary from application to application.

8

In Figure 3, at the end of the pre-calendering section 34 and the coating section 36 is a single-contact pulling point 64 for tensioning and holding the web in said post-treatment step. Draw 64 allows good web control throughout the post-processing step associated with that draw 5. A single touch of the drawstring contributes to the durability of the strap during pulling. The measuring elements 62 determine the desired properties of the web.

In the system of the invention shown in Fig. 3, a head-export ribbon for introducing the web into and through the subsequent post-treatment step can be formed in two cutting positions. In other words, the first edge trim is cut in the machine direction of the web-forming machine at an earlier cutting position than the second edge trim. Referring to Figure 3, the transport of the web from the precalender is discussed. Also, the method according to the invention can be used to form a headband for pre-calendering. Hereby, the first edge trim is formed earlier on the drying section than the second edge trim. The first edge trim may be formed by first cutting means at the beginning of the drying section and the second edge trim may be formed by the second cutting means located at the end of the drying section. In other words, a method according to the invention or some other method may have been used for threading the web to the dryer section and pre-calendering.

In the system according to the invention shown in Figure 3, a web is formed on the coating portion 36 by a first cutting means 14 and a second cutting means 16, the first cutting means 14 being in the machine direction of the forming machine (not shown) for both cutting means 14, 16 35, and the cutting means 14, 16 are adapted to cooperate for cutting edge trims at various cutting positions 15, 9 17. To transfer the web to the coating member 36, the first edge trim is first trimmed from the first 24. The remaining 5 webs continue to travel to each other with cutting means 16 for cutting Toine from the web n edge trim. The second edge trim is driven to the wreckage from the lower landing position 26 after the second lowering roller 23. Between the edge trimmings cut by the cutting means 14, 16 and lowered at the lowering positions 24, 26, a tension strap is left. Said tensioning strap is transferred to the coating portion 36 by a vacuum conveyor / tailshooter 46. Further, through the coating portion 36, the tensioning strap is transferred to a tensioning rope 44. In the above method, the edge trim is cut at different cutting positions, thereby cutting the first edge trim 15.

In the system according to the invention shown in Fig. 3, the threading strap 38 is formed in two separate cutting positions 15 ', 17' respectively.

20 Commas with reference numerals are used for functionally equivalent parts as commas. For example, when cutting with the first cutting means 14, the first edge trim is cut to form a threading strip for threading onto the coating portion 36. On the other hand, with the first cutting means 25 14 ', the first edge trim is cut to form a threading strip with the first calming section 38. The first edge trim is driven to the wreckage from the lowering position 30 'after the first lowering roller 21'. The remainder of the web continues to travel to the second cutting means 16 'to cut another edge trim from the web. The second edge trim is driven to the wreckage from the lowering position 26 'following the second lowering roller 23'. In connection with both lowering rollers 21 ', 23' is a scraper 68 for guiding the edge trim 35 to the wreckage. Between the edges 10 cut by the cutting means 14 ', 16' and lowered at the lowering positions 24 ', 26', a headband is left. Said tethering strap is transferred to calendering section 38 by a vacuum conveyor / tailshooter 46. Further, through calendering section 38, a tapping strap is moved by a tethering rope 44. The arrangement of the export means for the exemplary threading strap 5 may vary within the scope of the invention. According to the invention, the cut-off strap in two successive positions is introduced at least to the lowering position of the cutting position following the last cut or to the last lowering position. The invention is very advantageous because it can use pre-cut tools on the machine. In this case, the system includes control means by which the cutting means are adapted to cooperate for cutting edge-rims at different cutting positions. In other words, the cutting means are controlled by the same control means including the counting means to account for the operating delay between the cutting means.

By forming a headband by cutting two edge trims at different cutting positions, the passage of the headband-20 tin strip on a board machine can be greatly improved. Therefore, the system 12 according to the invention is particularly suitable for use on board machines. The method and system of the invention enable double cutting to be used on board machines instead of the conventional one-sided. With the invention, it is also possible with the board machine 25 to place the threading strap at any point in the cross-machine direction. The width of the headband is also freely selectable.

Claims (8)

A method of creating a tip drawing tape in a sheet forming machine, according to which method a tip drawing tape (10) of the web (28) is created by cutting the web (28) into three parts, which is a first trim edge (18), a tip drawing tape (10) and a second trim edge (20), and the first trim edge (18) is cut earlier than the second trim edge (20) in the machine direction of the sheet forming machine, characterized in that the first trim edge (18) is cut into a first cutting position (15) and the second trim edge (20) is cut into a second cutting position (17), and there is at least one roller (19) between the cutting positions (15), and the cutting of the trim edges is controlled in cooperation by calculating the functional delay between the cuts. 15 Method according to Claim 1, characterized in that the trim edges (18, 20) are driven down from the roller (21, 23) following the cutting positions (15, 17), adjacent to which it comprises a cutter (68). 20 Method according to claim 1 or 2, characterized in that the first trim edge (18) is created on the operating side of the sheet forming machine. 25 Method according to any of claims 1-3, characterized in that the trim edges (18, 20) are cut with cutting means (14, 16), and the cutting means (14, 16) are driven to the edges of the web to widen the tip drawing band (10) to a web. (28) at full width. A system for creating a tip drawing belt in a sheet forming machine, the system comprising: - first cutting means (14) for cutting the first trim edge (18), 5. second cutting means (16) for cutting the second trim edge. (20), wherein the tip pull band (10) is arranged to be created between the first cutting devices (14) and the second cutting devices (16) in the transverse direction of the sheet forming machine, characterized in that the first cutting devices (14) lie ahead of the second cutting devices (16). in the machine direction of the sheet forming machine, and the system (12) comprises control means (22) for both cutting means (14, 16), and the cutting means (14, 16) are arranged to cooperate for the cutting of the trim edges (18, 20), and the control means (22). ) includes computing means 15 (30) to take into account the functional delay between the cutting devices (14, 16). System according to protection claim 5, characterized in that the cutting devices (14, 16) are diagonal cutting devices. 20 System according to claim 5 or 6, characterized in that the cutting devices (14, 16) are water, blade or laser cutting devices. System according to any one of claims 5-7, characterized in that the first trim edge (18) is cut in the first cutting position (15) and the second trim edge (20) is cut in the second cutting position (17), and both the cutting positions (15). 17) is followed by a drop roller (21, 23), adjacent to which it comprises a shaker (68).