FI112196B - Method for threading a paper web - Google Patents

Description

, 112196

Method for threading a paper web

The invention relates to a method for inserting a paper web head of the type shown in the preamble of claim 1.

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In the continuous roll of the paper web, a full-sheet web from previous parts of the machine is rolled into a machine roll. The web is guided through a reeling cylinder around a reel roll. The roll change in the paper web reel is known to be performed by cutting the web going to the old, full 10 reel, and guiding it around a new reel roll which is brought to the change position. Shifting is performed at travel speed.

To begin the continuous rolling winding described above, the web 15 must be guided through the pre-roll machine parts and various rollers for the first time to the reel and guided around an empty reel reel. Here the so-called. in threading, a narrower threading strip separated from the full width web prior to the roller is introduced over the winding cylinder, and the remainder of the web is led into the pulp 20 before the roller. At the separation point there is a cutting element, for example a cutting blade or a water jet, for separating the main export ribbon. It is easier to first make the web as a narrow strip to follow the rolls and other web guiding members, and once it is stabilized and sufficient tension is obtained, it may be slanted to move to the full width web by cutting the web:.

- * <*: The roller head strap, starting from the narrow strap thread and ending in a full-width web wrapped around the reel roll, can be accomplished in two different ways: '§30 ... - The edge strapped strand is introduced over the roller cylinder and first allowed to drain into the pulper. Thereafter, the blade is lifted by blowing onto a reel roll, after which the web is spread to full width.

35 - The tape is first introduced over the reel roll and guided through the pulp. after which it is spread into a full-width web, further fed into a pulper. The course is then lifted by a goose-neck blowing onto the reel roll.

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Both threading options have their drawbacks. When lifting the headband alone onto the reel roll, the web initially accumulates near the other end of the Tam drill roll as the headband passes along the edge of the track 5. In this way, the bottom of the roll is formed into a one-sided, so-called. "Carrot" and the risk of bottom defects and the amount of paper to be shredded. For thin paper grades, web control during spreading is also difficult because the nip between the reel drum and reel roll carries and pulls just at the raised web. In addition, in this case, the bottom of the first roll 15 will be different from the bottom of the first roll with a normal start sequence. rolls if any other changeover device is used during these changeover sequences, and the goose neck is an additional expense if used only for threading the head for lifting the reel reel. and the machine orientation of the paper 20 has increased, and the reliability and performance of the goose neck have further deteriorated.

. For the continuous roll rewinding, many switching methods have been developed specifically to replace the already firmly moving roll of the roller that is already in the roller, at driving speed around the new, empty reel spool introduced on the roller contact on the roller cylinder. with a full width web. These are used for example. pre-winding cutting means which cut a narrower strip in the middle of the web, which can be blown to raise a new empty reel reel and spread into a full-width web. Such ways have been described e.g. U.S. Patent No. 5,360,179; and German Patent Publication No. 42 08 746, corresponding to U.S. Patent No. 5,314,132. With Cutting Machines-: V Lifting the Wedge-shaped Point by Blowing a New Reel Reel

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35 is also shown in the European Patent - *. No. 658,504, corresponding to U.S. Patent No. 5,531,396. These are all work steps that are '·· [in the previous case, during continuous roll change • »that are not directly applicable when starting 112196

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winding the first roll. Generally, the end-of-roll of a paper web in a roller has been traditionally performed while methods to control the web passage in the roller during continuous roll-up have been developed.

U.S. Patent No. 5,234,549 discloses a method for inserting a web end in the event of a web break with a portion of a nip between the dry end calender rolls of a papermaking machine. A cutting device in front of the calender rolls separates a narrower threading strap from the web, which is fed to the threading ropes after the nip of the calender rolls, and the rest of the web is fed to the pulper after the nip. The cutting unit is then moved to the center and a second cutting unit is brought to the edge of the web, the narrow edge strip separated by which is also fed to the pulper. The threading strap is thus moved from the edge to the center and can be moved more to the center of the web by moving both cutting units simultaneously. Thereafter, each cutting device is moved toward the edge of the web to distribute symmetrically to the full-width web. The publication does not deal with the reel head and its special requirements.

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The object of the invention is to eliminate the aforesaid drawbacks and to provide a method by which the winding of the reel when starting the winding of the first reel can be carried out with certainty, whereby the bottom of this reel does not decisively differ from the bottom of other reels. In order to realize the object of the invention, the method according to the invention has a head; the subject matter being characterized by what is set forth in the characterizing part of the appended claim 1.

From the full-width web, a narrower threading strap 30 is initially separated from the peripheral region of the web and is routed in the usual manner between the winding cylinder and the empty reel roll introduced into the threading station. The narrower headband is then separated from the center of the track. This threading strap is finally moved around the reel roll and applied: thereafter to a full-width web. The full-length roller can now be wound around a reel roll in the normal way, and then can be; the web may be replaced by a suitable replacement method. This results in a complete machine roll formed after the threading. 112196 4 is also of the same quality as the machine rolls formed during continuous travel.

According to an alternative, the threading strap is moved to the center 5 by initially spreading the separation point across the transverse direction, which is further guided to the wreckage via the winding cylinder and separating from this wider web a narrower centering strap which is moved around the reel roll.

Alternatively, the headband may be moved directly from the edge to the center without spreading substantially wider between the webs if there is no need to first stabilize the wide web in the reel, e.g., to achieve quality.

According to yet another alternative, from the wider web, which is led into the wreckage through the nip between the reel roller and the reel roll, a narrower center threading strip is separated from the center immediately after the web processing unit, e.g. the calender. Preferably, the threading strip is separated as close as possible to the winding cylinder, e.g. by the portion of the web by which it is tangential to the winding cylinder, or by cutting against the peripheral surface of the winding cylinder, and guided around the spool roll and spread symmetrically.

Other preferred embodiments are disclosed in the appended dependent: •; '25 in the claims and the description which follows.

The invention will now be described in more detail with reference to the accompanying drawings, in which: - Figure 30 schematically shows a side view of the roller, * Figure 2 schematically shows a plan view from above, Figure 3 shows a side view of the roller, and • *.: · ·. Figure 4 shows a detail of Figure 3.

5, 112196

Figure 1 is a side elevational view of a continuous paper roll rewinder. The picture shows the situation in the case of a headache. The roll roll has a winding cylinder 1 through which the web is guided in winding around a reel roll to form a machine roll while the Tam-5 wood roll is supported at the ends in a support structure such as winding rails 5. The reel roll 2 is preferably already brought to the winding position takes place. This support structure may be a fixed support, such as a pair of winding rails, or also a trolley moving in the machine direction. Fig. Ku-10 shows the passage of the headband T1, which corresponds to the later passage of the full width web. The threading strap T1 is guided through a spreader roll 4 or the like to the periphery of the winding cylinder 1, and is led downwardly to the pulper or a similar wreckage handling system on the other side of the winding cylinder. An empty reel reel 2 is introduced into the runner station 15 on rails 5, whereby the reel reel belt T1 passes between the reel cylinder 1 and the reel reel 2. The threading strap T1 is introduced by any suitable means, such as by means of a twine guide, suction straps, blow dampers, etc., between the winding cylinder 1 and the reel roll 2 in the winding station, after which the nip between the reel cylinder and the reel roll is closed.

When the threading strap T1 passes through the nip between the reel cylinder 1 and the reel roll 2, the reel roll 2 is already in the reel position and does not need to be moved along the periphery of the reel cylinder 1.

The threading devices for introducing the threading tape T1 onto the winding cylinder are not shown in further detail. Likewise, devices for importing an empty reel reel • «* ;;; the roller and for transferring to the head-up position, such as the lower arms and lowering winder, are not shown in further detail. In connection with the invention, many roller constructions are used in which the full-width web is rolled continuously on successive machine rolls, and a load is provided between the roller and the roller-roll cylinder, and the invention is not limited to i: certain roller structures.

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Fig. 2 is a top plan view of a method of performing a head thread according to the invention. The threading device, eg ropes, is designated by reference numeral 6.

35 A cutter 3a (shown with dotted lines) is cut from the edge of the web W a certain distance from the outer edge before the fish. ···. the blades C, the aforesaid threading tape T1 passing through the nip between the winding cylinder 1 and the empty reel reel 2 as described above, and 6 112196 the other web being guided to a pulper or similar wreck treatment system prior to the reel. The cutting device 3a is then moved to the center and over the center to the other edge of the web (arrow I), whereby the web passing between the winding cylinder 1 and the reel roll 2 also widens to full plate 5 and is further led down to the pulper or similar wreckage system. At the same time, it is possible to adjust the paper quality to the quality objectives and to monitor the stabilization of the quality in the case of head transfer at the change of grade, and / or to ensure that the wide paper web W runs as such.

The web is then narrower again by bringing the cutting device 3a moved to one side backward in the middle (arrow II), and in the opposite direction or in the same direction (arrow III) a second cutting device 3b remaining at a distance from the first cutting device 3a. in the center of the web is formed 15 threading straps T2. In this case, the web has a central threading strip T2 separated by cutting devices 3a, 3b and a wider portion extending on both sides to the edge of a full-width web. These three sections are further guided over the reeling cylinder 1 to the pulper. The central threading strap T2 may be severed and guided to the reel roll 20 by a suitably directed blow which acts upon the reel after the nip between the reel cylinder and the reel roll. The blowing can be applied, for example, either from the side of the reel roll 2, i.e. from the track, or from the side of the winding cylinder 1, i.e. below the track, to the threading strip T2. When '. having the threading strap wrapped around the reel roll, the strap can be spread again into a full-width web in opposite directions by moving the cutting means 3a, 3b to each of its edges, resulting in a symmetrically spreading wedge from the threading web to a full-width web W.

The headband T2 may be positioned in the center of the web so that the machine centerline of the full-width web, i.e. the line dividing the web: T: into two equal portions, is within the headband, but may also be on either side of this line. such as a threading strip normally located at the periphery of the outer edge of the web, for example in the region of the middle two-quarters of the full width of the web, preferably in the middle-third of the web.

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Fig. 2 illustrates how the cutting means 3a, 3b are disposed in the same transverse web guide 7, such as a transverse beam or the like. However, the cutting devices 3a, 3b may also be disposed independently of each other so that they can, for example, pass each other when moving in the width direction of the web. It is essential that they can always be positioned at different positions along the width of the web so that an edge banding strip T1 is left between one cutting device and the outer edge of the web, or a middle banding band T2 is formed between the two cutting devices.

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The cutting devices 3a, 3b may be cutting blades or jets of water, and may be moved obliquely from the slits by known mechanical solutions not described in more detail herein.

Another alternative for carrying out the threading is to first separate the narrower threading strip T1 from the peripheral area of the full-width web, which is fed to the pulper between the roller cylinder 1 and the Tam drill roll 2 brought to the roller position. The threading strap 20 is then moved directly to the center of the web by moving the first cutting device 3a in the middle and then moving the second cutting device 3b toward the center from the same edge direction, thereby creating a second separation point on the web thanks to the second cutting device 3b. With the movement of the cutting devices 3a, 3b - ·: *, the threading strap moves to the center of the web and finally forms the middle region 25 of the strapping thread T2. Depending on the movement of the cutting equipment, this strip may also become wider or narrower than the initially separated tail strap T1, but at the end it is typically similar to a tail strap width, e.g., 15 to 50 cm wide.

··; *; This threading strap T2 continues to pass between the winding cylinder 1 and the lance 2 and the portions of the web on both sides thereof become wrecked before the reel. The strip T2 is applied to the full-width web by moving the cutting devices 3a, 3b to opposite edges, whereby the weft strap T2 is wedge-shaped to a full-width web such as; '·' · in the previous alternative.

Figure 2 further shows how the cutting devices 3a, 3b are located before the calender C. It is possible to position the cutting devices 8 112196 3a, 3b in a common guide 7 or independently of different guides between the calender C and the winding cylinder 1. The cutting means 3a, 3b and the supporting and moving structures thereof can be, for example, on the portion between the spreader roll 4 or the like and the reeling cylinder 1, i.e. the portion 5 where the web is rotated by the last roll on the winding cylinder shell tangentially to the periphery of the reeling cylinder. In this case, the full-width web should be introduced as its own thread between the winding cylinder and the reel roll using an earlier inclined cutter. Such cutting devices located just prior to the reeling cylinder may be cutting blades or water cutting nozzles.

Figure 3 illustrates in further detail an embodiment utilizing this idea in side view. Here, the cutting devices 3a, 3b are disposed on the reeling cylinder 1. The cutting devices 3a, 3b are preferably water cutting nozzles located above the web. A jet of water from the nozzles cuts the full-width web W against the winding cylinder 1 and likewise provides separation points separating the middle of the web T2. Initially, the full-width web W is guided down through the nip between the winding cylinder 1 and the reel roll 2 to the pulper.

A pair of cutting devices 3a, 3b starts the separation of the threading strap T2 from the middle of the web, and this strap is cut off by a lifting device 8 located in the widthwise direction of the strap at the rails 5 or below a reel roll 2 in the corresponding support structure. The device is a plane term. a pick-up damper, with nozzles 8a, · * for blowing-25 blowing with powerful air jets; which are directed towards the ribbon T2 on its sides, and the reel roll 2. nozzle openings 8b directed towards the diaper which guide the truncated • · · threading strap T2 around the new end of the spool roll 2. At the end of the cut-off blowing nozzles 8a is a first transverse series of nozzle openings 8b or a nozzle slot for cutting off the end of the tape: * · *: away from the winding cylinder 1 above the device 8. Device 8 ·; ·. comprising, in the direction of rotation of the reel roll, after the first nozzle openings 8b or nozzle slot, other nozzle openings 8b or one or more nozzle slots for guiding the tape around the reel roll 352. Once the tape T2 is received around the reel roll 2, the cutting means 3a, 3b can be moved away from one another to the opposite of the web. 4, the device 8 is positioned so that the first nozzle openings 8b are closest to the surface of the reel roll 2.

The cutting means 3a, 3b may be in a constant position at the start of the cutting, or they may move transversely, thereby separating from the rest of the web the tip portion of the threading strap T2 which can be immediately lifted onto the spool roll 2 by the lifting device 8.

The lifting device 8 is connected to a compressed air source which provides both cut-off blast 10 and control blast.

The solution of Figures 3 and 4 can also be applied in an exchange situation. In this case, the web W is cut as in threading and the end of the new web is wrapped around the reel roll 2 by the same lifting device 8 15 as the threading is performed. The lifting device 8 is arranged to be movable in the vicinity of and away from the reel roller 2 by means of a suitable actuator.

The invention is not limited to the foregoing description, but may be modified within the scope of the inventive idea set forth in the appended claims. The tailing strip T1, which is separated from the edge, may not necessarily be between the separation point (e.g., cutting device 3a) and the outer edge of the full-width web, but there may be another "I" separation center (e.g., cutting device 3b) separating the outer edge which is led to the wreck in the same way as the rest of the web.Also, in the alternative of spreading the edge region taper tape T1 before narrowing it to the center region region tape T2, the spreading need not necessarily occur at full width, but may remain less than normal running width, but is preferably carried at least so far that the cutter moves towards the other edge of the spread and returns to its central region to form the second edge of the headband T2.

35 The invention is likewise not limited by the fact that the tapping tape / web is supplied to the winding cylinder 1 as a free run or whether it is used endlessly; **; an air-permeable support strap, such as a wire, felt, or other support web for passing the thread / web over the reeling cylinder 1 and between the reeling cylinder 1 and the reel roll 2 in the reeling position, e.g., as disclosed in EP 658504.

In addition, when the narrow edge threading tape T1 is first introduced between the reel roll 2 and the winding cylinder 1, suitable auxiliary means may be used to guide it. The nip of the reeling cylinder 1 is closed in this threading, and the nip may be a nip between the reel roll 2 and the reeling cylinder 1, or a nip between the separate auxiliary roller and the reeling cylinder 10 1. When the web is being applied, the nip between the reel roll 2 and the winding cylinder 1 is closed.

Known control and adjusting devices for performing the functions during the head extension can be used in the invention. For example, it is possible to synchronize the lifting of the central threading strap T2 to the spool roll 2 and its application according to machine speed so that the narrow base is not initially rolled over the spool roll and the nip does not open at the edges nip has a long web path, e.g.

with the cutting equipment before the calender C. The application and the cutting / lifting operation are suitably synchronized with each other.

:: · Synchronization interval from cut / lift to spreading can. be positive, zero or even negative, so that the application can be started a moment before the threading strap T2 is cut off or lifted onto the reel roll 2, especially if the applicator cutters are ahead of the calender C. The synchronization may also be * · dependent on machine speed. In the automatic headland control •:: system, which gives instructions to the cutting equipment and 30 cut-off / lifting equipment, the time between these functions can be set, e.g., based on machine speed, and the system can also calculate and T: automatically adjust the synchronization time.

• X The traverse speed of the cutting attachments can also be adapted to the driving speed of the machine so that the opening angle of the spreading wedge is always 35 and can be done, for example, by automatically adjusting the cutting speed in the transverse direction according to the measured or known speed of the machine.

Claims (17)

A method of tip-pulling a paper web in the paper web wheelchair, in which a narrower feed tip 5, separated from a full width web, is guided when a tambour roller (2) in the tip-pulling position (2) in a tip-pulling allows for this continuous roll-up when the roll of the first roll is started, it is transmitted on the tambour roller (2) and thereafter propagates to a full width web (W), whereby the advance tip (T2) is separated from an area between the edges of the completed web closer to the center of the web, transmitted around the tambour roller (in the tip drawing position). 2), and is extended in two directions to a full width web (W) to roll the full web around the tambour roller (2) as a machine roll, characterized in that after the nip existing between the rolling cylinder (1) and the tambour roller (2) the feed tip (T2) is guided away from the rolling cylinder (1) by blades around the tambour roller (2). 2. A method according to claim 1, characterized in that a web wider than the feed tip (T2), preferably a full width web (W), is guided past the tambour roll (2), the feed tip (T2) is separated from the web. in the tip pulling position, the tambour roller (2) is present and is spread in two directions to a full width web (W) to roll the completed web around the tambour roller (2) as a machine roll. '25 3. A method according to claim 2, characterized in that a web wider than the forward tip (T2), preferably a full width web (W), is driven over the rolling cylinder (1) and between the rolling cylinder. : (1) and the tambour roller (2) and guided down to a projection processing system or the like, the feeding tip (T2) is separated; from the web, is transmitted around the f 'in the tip-pull position: the tambour roller (2) and spreads in two directions to a full width web (W) /. to roll the finished web around the tambour roll (2) as a ': machine roll. 35 4. A method according to claim 2 or 3, characterized in that at first an advance tip (T1) is separated from the edge area of the web and it is guided past the tambour roll (2), this advance tip (T1) spreads to an ice sheet 112196 which is further transmitted. past the tambour roll (2), whereupon a narrower forward tip (T2) is separated from this web closer to the center of the web than the initially separated feed tip (T1), this closer to the middle of the web is advanced (T2) existing in the 5 web 2) and spread in two directions to a full width web (W) to roll the full web around the tambour roll (2) as a machine roll. Method according to Claim 1, characterized in that at the beginning 10 a feeding tip (T1) is separated from the edge area of the web (W), and it is guided past the tambour roll (2), and this feeding tip is transferred closer to the center of the web, after which it is closer to the center of the web. the web transmitted forward tip (T2) is transmitted on the tambour roller (2) present in the tip drawing position and is extended in two directions to a full width web (W) to roll the completed web around the tambour roller (2). Method according to any of claims 1 to 3, characterized in that from the web (W) which is guided to projections through the nip between the rolling cylinder (1) and the tambour roll (2), a narrower feeding tip (T2) is separated in the middle portion after a prior to the wheelchair, the web processing unit, such as a calender (C), advances the tip (T2) around the tambour roller (2) present in the tip pulling position and is extended to a full width web (W) to roll the completed web around the tambour roller (2). 25 « Method according to claim 6, characterized in that a narrower: feeding tip (T2) is separated from the web (W) in the region between the edges: by the full web in the section of the web in which it runs: tangentially on the rolling cylinder (1), or on the periphery of the rolling cylinder (1). A method according to any of the preceding claims, characterized in that the feeding tip (T2) is separated from the area; between the edges of the full web with two at different points in '' ': existing cutting devices (3a, 3b) transverse to the web. • 9. A method according to claim 8, characterized in that cutting devices (3a, 3b) are cutting blades. 16 112196 10. A method according to claim 8, characterized in that the cutting devices (3a, 3b) are blank beams, such as water jets, which cut the web. 5 Method according to Claim 8, 9 or 10, characterized in that, from the edge area of the web, first a feeding tip (T1) is at least separated by one of the cutting devices (3a, 3b). 10 Method according to any of the preceding claims 8-11, characterized in that the forward tip (T1, T2) is spread in a wider form, and / or is transferred to another point by transferring the cutting devices (3a, 3b) in the transverse direction of the web. . 15 Method according to any of the preceding claims, characterized in that the tip pulling position of the tambour roller (2) is the same as the rolling position. Method according to Claim 13, characterized in that the tambour roller (2) is in the rolling position when the web which is wider than the feeding tip (T2) transmitted on the tambour roller, preferably the full web (W), is guided past the tambour roller (2). 15. A method according to claim 14, characterized in that the tambour roller (2) is in the rolling position already when the feeding tip (T1) separated from the edge area of the web is guided past the tambour roller (2) before propagating the same to the wider web which is further guided: by the reel spool. 30 Method according to any of the preceding claims, characterized in that the feeding tip (T2) is guided on the surface of the tambour roll (2) with one placed below the tambour roll (2). blower (8). 35 17. A method according to claim 16, characterized in that the feeding tip (T2) is broken with the same blowing device (8) with • in which it is guided on the surface of the tambour roll (2).