FI101876B - Method of cutting a web and cutting device for a web - Google Patents

Description

101876

Method for cutting the web and web cutting device For the cutting of the web and the cutting of the web 5

The invention relates to a method for cutting a web in a carrier roll winder, in which the web of the roll 10 formed in the carrier roll support is cut by cutting angle before starting a new winding. a carrier roll winder by means of at least a second carrier roll, and in which method the magnitude of the web folding angle with respect to the first cutting member is increased by the second cutting member, the web being broken at a sufficiently large angle by the first cutting member.

The invention also relates to a device for carrying out the method according to the invention, comprising a first cutting member movable upwards from the gap between the carrier rollers and a second cutting member adapted to move the full roll and the first cutting device. : from top to bottom in the gap between the carrier roll, and the pusher ..1, · 1 25 tons to push the finished roll towards the second carrier roll and the lowering device.

• · · • · · • ·

As the speed of the machines used in the production and finishing of paper (e.g. coating, calendering, longitudinal cutting) increases by up to 30 over 2500 m / min. also applies to the operation of the track cutter • • ·!.! requiring a shorter response time, a smaller size, • · · *. greater accuracy and reliability.

• · • · · ♦ · · ♦ · 1 · • · ·: '· The cutting devices are used in the winders as part of the machine roll change equipment.

• · • · · · • ♦ ♦ • <1 • 1 2 101876

Conventional methods of solving the web are puncturing the tensioned web with a cutting blade, local weakening of the web (e.g. perforation) and increasing the web tension, and folding the web taut against the cutting blade.

FI patent 75788 discloses the puncture of a tensioned web with a cutting blade, i.e. the blade of the cutting device moves and performs an impacting cutting movement. The carrier roll winder according to the publication has a rear and front carrier roll, a web cutting device, a pushing device for moving the finished roll from the carrier rollers and a feed device for the new winding sleeve. The cutting and feeding devices are operatively connected to the pushing device for movement in their operating position via a common support arm. The support arm is rotatably supported at one end to a pivot point located in the region of the center axis of the rear carrier roll, and the pusher is rotatably attached to one end 15 of the support arm so as to move the pusher arm

To support and hold the web during the changeover, the carrier roll-20 roller comprises a retractable holding abutment between the carrier rollers that holds the web against the back carrier roll. The cutting equipment comprises • · ·. ·. means for cutting the web by the percussive movement of the cutting blade • · ·! la, which movement is directed to the area of the tip of the holding abutment, towards the web part between this tip and the “] pushing device and which they hold taut •« · ··· 25.

SE-447817 discloses a web solving method in which a web is perforated and the web is cut by pushing the roll forward.

• * • · · • · · •; EP-0500841 discloses a solution method in which a web. *. causing local weakening and an increase in track tension, causing the web • · · • · · ** · / to break. To secure the truncated tail of the roller, the roller is rotated • · '··· *.

• · · 35 As a defect in the publications according to publications FI-75788, SE-447817 and EP-0500841 • ·

The solution methods are that a higher orbital stress is required in the cut-off than in the cut-off based on the angle of refraction. Especially for heavier web grades (e.g., basis weight greater than 150 g / m 2), the stress required to tear the web can be significantly greater than the normal stress during winding. The higher web tension-5 has the disadvantage that at the moment of cutting the whole web is tensioned until it is unwound in the winding part and this tension is released at the moment of cutting, which may move the longitudinally cut sub-webs or even drop the sub-webs out of the web path. In addition, it is considerably difficult to cut the web at the correct location 10 and requires more complex equipment or a slitter to crawl after weakening the web. This slows down the changeover, i.e. it affects the downtime of the slitter and thus the capacity.

Another drawback is that the rupture of the web from the desired point with heavier web qualities of var-15 is uncertain: once the web has begun to rupture, the rupture can easily progress away from the weakened line. In this case, it is difficult to start a new roll for empty cores, and the quality of the rolls at the bottom of the roll remains poor.

FI patent 94514 and US patent 4370193 disclose a cutting method in which the web breaks when it is folded at a sufficiently large angle. against the reed blade.

• * · «· • ·» • · · "* FI patent 94514 discloses a cutting device for a web winding device • · * ····· 25. The cutting device comprises a frame structure and a cutting blade with which • · · M <' the web of the roll is • · · ·. · * can be cut before starting a new roll. by intermediate means, by inserting into the cutting blade so that the cutting blade is adapted to move along the curved trajectory of the ground so that the position of the cutting blade in the lower • · * ··· * mass position is substantially further from the carrier roller than in the upper position. The transmission elements consist of the first arms and; * ·. · 35 second arms of the with the arms pivotally articulated • · 4 101876. The pivoting movement of the first arms is synchronized by means of a synchronizing tube.

The cutting of the web itself takes place only because the blade is sharp enough to pierce the web tensioned by the roller. The cutting of the web on the roll can also take place by pushing the roll with a pusher known per se, whereby the taut web forms a sufficient angle with respect to the cutting blade, as a result of which the web breaks.

A disadvantage of the cutting method according to FI patent 94514 is that breaking with heavy web grades, i.e. thick grades, which require a large bending angle and high tension, is uncertain. At least at the time of cutting, the roll has already rolled very far into the lowering device, leaving a long loose tail 15 from the roll to the cutting blade, which has the disadvantage of moving the rolls further from the lowering device to the conveyors and along them to the packaging device.

Even with thinner grades of paper, the roll has already passed the highest point of the front carrier roll before the web has the angle of refraction 20 over the cutting blade required for cutting. As a result, the rolls thus roll into the lowering device after the web has been broken, whereby the rollers are released. any attachment of the woman's tail to the roller must be performed in or after the lowering device. Because the lowering device or its ···; after there are no more tools for rotating the rollers, the tail is «« · ···· 25 fixed by hand, which is very tedious, especially in wide rollers • · · ’.I · *, where up to more than 30 rolls are made at a time.

• · · • · · • *

A disadvantage of the solution according to US-4370193 is that: the roll has already passed the highest point of the front carrier roll before: * · '· 30 as the web has the necessary angle of refraction over the cutting blade.

. *. Also in this known solution, the rollers roll into the lowering device after the web is broken. It is not possible to narrow this known device • e * "· * so that the rollers do not harden at the time of cutting because:: the device becomes too narrow to support the weight of the rollers especially well: * ·, · 35 wide carrier roller winders. In addition, very large winding cores, 5 101876 in outer diameter even more than φ 350 mm, do not fit in the core feeder.

A common disadvantage of the cutting methods according to FI-94514 and US-4370193 is that the moment of breaking of the web depends on the position of the rollers to be transferred to the lowering device, i.e. the bending angle of the web over the cutting blade. Thus, thin web grades break at earlier stages than thick web grades. Thus, there is a certain combination of web thickness and roll diameter which, with a stronger paper 10 or larger roll, the rollers have already passed the highest point of the front carrier roll before the web breaks. In these cases, the attachment of the loose tail of the finished roll to the roll cannot be performed automatically on support rollers where the roll is easy to rotate with existing equipment and where the surface layers of the roll remain taut and in the correct position in the direction of the roll axes. Tail attachment is common and important because a loose tail can interfere with the further processing of the rollers, e.g. by activating the photocell sensors on the conveyor devices. When the rollers move to the lowering device at the time of cutting, the tail must be attached manually. Often, the surface layers of the 20 rolls also loosen as the rolls roll into the lowering device, in which case the surface layers must be cut off the roll before the manual attachment and the new, tensioned web of the web exposed just below them must be attached! remained head.

• e · • · · »• · · ···· 25 For almost all web grades, the bending angle required for cutting is • ♦ · M. * only becomes large enough when the finished rolls have passed the second roll. the highest point of the carrier roll. In this case, the typical values of the carrier roller are: the diameter of the carrier rolls φ 70-100 cm and the diameter of the finished roll greater than suurempi 100 cm. This is valid for • · 30 times when the cutting blade is raised to the height to which the new rollers. *. the bellows settle, and this is the easiest way to start a new winding, • · · • · · *** / i.e. the cutting blade cannot be raised as high as possible to achieve a large angle of refraction, because the diameter of the new winding core determines the web: * : breakpoint.

: 35 • · · 6 101876

The object of the invention is to provide an improvement on currently known cutting angle-based cutting methods and cutting devices.

It is an object of the invention to provide a method and a device which reliably and accurately cuts even heavy webs at a desired point without having to locate the cutting point or the beginning of the web of a new roll when removing the rolls.

Yet another object of the invention is to provide a method and apparatus 10 that allows the loose tail of rollers to be mechanically attached.

Yet another object of the invention is to provide a method and a device which makes it possible to fasten the tail so that the surface layers of the roll have not had time to loosen due to the rolling of the roll.

The objects of the invention are achieved by a method characterized in that the finished roll is pushed by a separate pusher having an upper position for moving the second cutting member below the tip of the pusher and a lower position for removing small rollers by means of the tip of the pusher.

In a preferred embodiment of the method according to the invention, the finished roll is pushed away from the first carrier roll by a distance such that the roll does not exceed the line on the line of the second carrier roll. at the top. The magnitude of the web bending angle with respect to the first cutting member is increased by the second cutting member, so that when the bending angle is large enough, the web breaks at a point defined by the first cutting member while the finished roll center of gravity remains ♦ · .1 · 1 ♦ 30 inches inside the winding bed formed by the carrier rollers.

· 2 • · · 3 · The cutting device according to the invention is characterized in that the pushing device is a separate pushing device with an upper position for moving the second cutting member to move below the tip of the pushing device; and a lower position for removing small rollers by means of the tip of the pusher.

7 101876

The cutting method and device according to the invention achieve a number of significant advantages over the solutions known from the prior art: 5 - The invention makes it possible to break even a heavy web precisely at the desired point without the sub-webs moving at the time of cutting.

The cut-off takes place at a point where a new roll can be started immediately.

The cutting point can be adjusted according to the diameter of the new winding cores.

15 - After cutting, the rollers do not escape into the lowering device, but can be rotated to complete the gluing or to add tape for attaching the tail. In this case, for example, above the Pukkari roll, the various brackets have tape stations which, as the roll rotates, join the single-sided tape over the cut end 20 of the web.

• · i »i • · ·.! - Sleeves of all sizes, i.e. winding cores, can be brought into the gap between the carrier rolls with the same equipment so that the adhesive or tape line attached to them is exactly where you want it.

• · · 25 • · · * .ϊ. * - Changeover events are performed "in the process direction", so that no separate set-up times are required that would slow down the changeover. Due to the short migration time, the capacity of the slitter increases significantly.

• · 30 • · ·. *. The invention will be explained in detail with reference to some preferred embodiments of the invention shown in the figures of the accompanying drawings, to which, however, the invention is not intended to be exclusively limited.

. ·. : 35 «« · • · 8 101876

Figure 1 shows the web fold angle formed in the prior art solutions just before the rollers pass the highest point of the second carrier roll in a schematic side view.

Figure 2A shows a schematic side view of a preferred embodiment of the method according to the invention at the final stage of winding before the web is cut.

Figure 2B shows a schematic side view of a preferred embodiment of the method according to the invention at the time of cutting.

Figure 2C shows a schematic side view of a preferred embodiment of the method according to the invention after cutting.

Figure 3 shows a schematic side view of another preferred embodiment of the method according to the invention after cutting.

In the prior art embodiment of Figure 1, the carrier roller is generally indicated by the reference number 10. The carrier roller 10 comprises a first carrier roll 11, i.e. a rear carrier roll, and a second carrier roll 12, i.e. a front carrier roll. The first carrier roll 11 is preferably perforated, • «· ... whereby the pressure inside it below the ambient pressure level • · * improves the retention of the sub-webs after cutting. The forming roll is denoted by reference numeral 13. Reference numeral 14 denotes • · · • ♦ • ί 25 pushers. In this embodiment, the pusher device 14 is a separate ♦ «· · ·.! * * Bobbin device comprising a beaker tip 15 and a feed device 16 for the winding cores • i.e. the sleeves 17. The cutting blade is generally indicated by reference numeral 18 and the web by the letter P. The roller lowering device is j *: *: marked with reference number 20.

30 • · ·. *. In the situation according to Fig. 1, the diameter φ • ♦ · ··· · of the first carrier roll 11 is 800 mm and the diameter φ of the second carrier roll 12 is 850 mm, and the diameter φ of the finished • · * ··· * roll 13 is 1500 mm. It can be seen from Fig. 1 that the bending angle according to Fig. 1 over the cutting blade 18 is not sufficient for the web to break.

9 101876

In the embodiment of Figures 2A-2C, the carrier roller is generally indicated by the reference numeral 10. The carrier roller 10 comprises a first carrier roll 11, i.e. a rear carrier roll, and a second carrier roller 12, i.e. a front carrier roll. The roll to be formed is indicated by reference numeral 13.

5 Reference numeral 14 denotes a pusher. In this embodiment, the pushing device 14 is a separate gusset device comprising a gusset tip 15, preferably a roller, and a feeding device 16 for the winding cores or cores 17.

The cutting device according to the invention comprises a first cutting member 18, which is a cutting blade, and a second cutting member 19, which is a counter-blade. The web is marked with the letter P and the roller lowering device with reference number 20.

In the situation according to Fig. 2A, the customer rolls have reached the desired diameter diameter, i.e. the roll 13 is a full roll, and the carrier roller 10 is stopped. Next, according to Fig. 2B, the first cutting member 18 is lifted up from the gap between the carrier rollers 11 and 12 to the point where the cutting point is correct according to the diameter of the new winding cores 20 17. At the same time, the tip 15 of the pedestal 14, which is preferably a roller, is turned up on the joints 21. Thereafter, the gusset 14 is started to be rotated on the joints 22, whereby the gusset tip • · · • · * '15 pushes the roll 13 away from the rear carrier roll 11 so that the second cut-off member 19 is suitable to move upwards from the gap opened by the full roll. ... I 25 down. Turning the tip 15 of the pedestal 14 up on the joints 21 provides sufficient space for the cutting member 19 to move below it.

• · · · The lower position of the tip 15 of the stand 14 is required for removing small rollers when rolling has been interrupted due to a track break, for example, and the rollers have remained small. In particular, it should be noted that in the method according to the invention, the roller 13 pushes the roller 13 so that the roller. *. 13 does not escape to the lowering device 20. This means that the roller • · · 13 must not exceed the uppermost point on the line Lx of the front carrier roller 12.

• · * ··· ’The vertical line passing through the center of the roller 13 is marked with the letter L2. It can be seen from Figure 2B that the roller 13 has been pushed • · ». '. j 35 so that it is at a distance e from the line Llt, i.e. from the uppermost point of the front carrier roll 12. The magnitude of the bending angle of the web P with respect to the cutting blade 18 10 101876 is increased by means of a counterblade 19, whereby a sufficiently large bending angle is obtained. The web F breaks at a point defined by the first cutting member 18.

According to this embodiment of the method according to the invention, the web P is cut in shifting with slitters so that the full roll 13 remains in the winding bed at all times during the cutting. In this case, the web P above the first cutting member 18 and below the second cutting member 19 due to the interaction of the cutting members 18 and 19 breaks at the first cutting member 18 while the center of gravity of the full roll 13 remains inside the winding bed throughout the event.

The method according to the invention makes it possible to break the web precisely at the desired point without the sub-webs moving at the time of cutting. The cutting takes place reliably regardless of the thickness or thickness of the web. The disconnection takes place at a point where a new rewind can be started immediately. The cutting point is also adjustable according to the diameter of the new winding cores 17. After cutting, the rollers 13 do not escape to the lowering device 20, but the rollers 13 can be rotated as described by arrows 31a 20 and 31b to complete the gluing or to add tape for attaching the tail. In Fig. 2A, the adhesive application member • ««,! is denoted by reference numeral 23. Above the gusset roll 15, tape stations can be placed on the different brackets, which, as the roll 13 rotates, connect the single-sided tape over the cut end of the web P (not shown).

• · · ... I 25 Instead of glue, eg double-sided tape can also be used.

Figure 2C shows a situation in which a new winding core, i.e. a sleeve 17, is placed in the gap between the carrier rollers 11 and 12 and the new winding is thus ready to start from the carrier roller winders in a known manner.

• · 30 • · ·

In the method according to the invention, sleeves 17 of all sizes can be introduced into the gap between the carrier rollers 11 and 12 by the same devices so that the adhesive or tape attached to them settles exactly at the desired position.

· '**; This can be done by lowering the winding cores, e.g. attached to suction cups 24 «· ·: 35. Thanks to the method according to the invention, relocation events can be performed naturally in the "process direction", in which case no separate settings or positions are required which would slow down the relocation. Due to the short migration time, the capacity of the slitter will increase significantly.

The cutting method according to the invention shown in Figures 2A-2C can also be implemented by placing the cutting members 18 and 19 in the opposite direction, whereby the counterblade 19 would be the cutting blade and the cutting blade 18 would be the counterblade, respectively. However, such an embodiment of the invention does not achieve as high a cutting accuracy as the embodiment of Figs. 2A-2C.

In the embodiment according to Fig. 3, the roller 14 can be used to push the roller 13 further, i.e. so far that the roller 13 exceeds the highest point on the line Li of the front carrier roll 12. In this case, however, the roller 13 remains 15 to rest on e.g. an additional roll 25. In this embodiment, the lowering device 20 is provided with a roller 25. Of course, it will be clear to a person skilled in the art that the roller 25 may be a separate roller or other similar member attached to another structure. Also in this embodiment, the roller 13 does not finally escape down-20 to the lowering device 20, but the roller 13 can be controlled, e.g. by a second carrier. . by means of roller 12. It should be noted that the carrier roller 12 is a driven carrier roller, whereby the carrier roller 12 can be rotated in the direction indicated by the arrow 26a * ♦ «• ·, whereby the roller 13 rotates in the direction indicated by the arrow 26b (i t • · '.

i I t

• 9S

···· ·. ·. · Only some preferred embodiments of the invention have been described above ··· ί # ϊ! and it will be apparent to those skilled in the art that numerous modifications may be made therein within the scope of the inventive idea set forth in the appended claims.

• · 30 30 • · · • · • · 1 4 * · · · i 4 · · · • · «· · • · · · · · · · ·

Claims (10)

A method of cutting a web (P) in a carrier roll wheelchair (10), wherein the method (P) of a roller (13) formed supported by carrier rolls (11, 12) is cut by cutting based on a break wine. prior to the start of new roll-up, in which process the finished roll (13) is pushed from a first support roll (11) to a second support roll (12) and a submersible device (20), the finished roll (13) still being may be controlled by means of at least the second carrier roll (12) of the carrier roller wheelchair (10), and in which method the size of the breaking angle of the web (P) with respect to a first cutting member (18) is increased by means of a second cutting member (19). , wherein the web (P) fails at a location defined by the first cutting member (18) when the breaking angle is sufficiently large, characterized in that the finished roller (13) is displaced by a separate sliding device (14) which has an upper position for is to allow the second cutting member (19) to move under a tip (15) of the slider (14), and a lower position for removing small rollers by the tip (15) of the slider (14). 20 Method according to claim 1, characterized in that the finished roll (13) is pushed away from the first support roll (11). such a stretch that the roller (13) does not like it on the line (Lx) · | placing the topmost place on the second carrier roll (12), whereby the center of gravity e ··· 1 of the finished roll (13) is kept throughout the course of the event within a roll-up bed formed by the carrier rolls (11,12). 3. A method according to claim 1, characterized in that the finished roll (13) in the process is detached from the first support roll (11). such a stretch that the roller (13) extends over the topmost position of the line (L ^) on the second carrier roll (12), the roller, 1. (13) remaining to abut against an additional roller (25) or equivalent; • · · • · · wherein the roller (13) can be controlled by means of the second carrier roll (12). «« · · «· • · 15 101876 Method according to any one of claims 1-3, characterized in that the first cutting means (18) is lifted by a gap between the supporting rollers (11, 12). Method according to any of claims 1-4, characterized in that the roller (13) is pushed away from the first support roll (11) so much that the second cutting member (19) can be displaced from the top downwards by one of the full roller (13) open run. 10 Method according to any of claims 1-5, characterized in that the site for cutting the web (P) is adjusted according to the diameter of new reel cores (17). Apparatus for carrying out the method according to any of claims 1-6, comprising a first cutting member (18) which is displaceably eaten through a gap between supporting rollers (11, 12), and a second cutting member (19), which is arranged to move from the top downwards through a gap opened between a full roll (13) and a first carrier roll (11), and a slider (14) for displacing the finished roll (13) against a second carrier roll (12) and a lowering device (20), characterized in that the pushing device (14) is a separate pushing device (14) which has an upper position for allowing the second cutting member (19) to move under a tip (15) of the pushing means. In the device (14), and a lower position for removing small rollers with the aid of the tip (15) of the slider (14). ··· • ·· · ♦ ♦ · * · ί · * A cutting device according to claim 7, characterized in that the first cutting member (18) is a cutting knife and the second cutting member (19) is a counter knife. : Y: 30 «· 9. Cutting device according to claim 7, characterized in. n a d thereof, that the first cutting means (18) is a counter knife and the second cutting means (19) is a cutting knife. · • · II »« · e: i 35 10. Device according to any of claims 7-9, characterized by: * ·. now that the various slider (14) is a pushbutton. «·