Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H19/00—Changing the web roll
  • B65H19/10—Changing the web roll in unwinding mechanisms or in connection with unwinding operations
  • B65H19/18—Attaching, e.g. pasting, the replacement web to the expiring web
  • B65H19/1857—Support arrangement of web rolls
  • B65H19/1863—Support arrangement of web rolls with translatory or arcuated movement of the roll supports
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H19/00—Changing the web roll
  • B65H19/10—Changing the web roll in unwinding mechanisms or in connection with unwinding operations
  • B65H19/12—Lifting, transporting, or inserting the web roll; Removing empty core
  • B65H19/126—Lifting, transporting, or inserting the web roll; Removing empty core with both-ends supporting arrangements
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H19/00—Changing the web roll
  • B65H19/10—Changing the web roll in unwinding mechanisms or in connection with unwinding operations
  • B65H19/18—Attaching, e.g. pasting, the replacement web to the expiring web
  • B65H19/1805—Flying splicing, i.e. the expiring web moving during splicing contact
  • B65H19/181—Flying splicing, i.e. the expiring web moving during splicing contact taking place on the replacement roll
  • B65H19/1815—Flying splicing, i.e. the expiring web moving during splicing contact taking place on the replacement roll the replacement web being stationary prior to splicing contact
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2301/00—Handling processes for sheets or webs
  • B65H2301/40—Type of handling process
  • B65H2301/41—Winding, unwinding
  • B65H2301/413—Supporting web roll
  • B65H2301/4136—Mounting arrangements not otherwise provided for
  • B65H2301/41361—Mounting arrangements not otherwise provided for sequentially used roll supports for the same web roll
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2301/00—Handling processes for sheets or webs
  • B65H2301/40—Type of handling process
  • B65H2301/41—Winding, unwinding
  • B65H2301/417—Handling or changing web rolls
  • B65H2301/4171—Handling web roll
  • B65H2301/4173—Handling web roll by central portion, e.g. gripping central portion
  • B65H2301/41734—Handling web roll by central portion, e.g. gripping central portion involving rail
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2301/00—Handling processes for sheets or webs
  • B65H2301/40—Type of handling process
  • B65H2301/46—Splicing
  • B65H2301/464—Splicing effecting splice
  • B65H2301/46412—Splicing effecting splice by element moving in a direction perpendicular to the running direction of the web

Definitions

• the invention relates to a method according to the preamble of claim 1.
• the invention also relates to an unwind according to the preamble of claim 10 for carrying out the method.
• Off-machine coating machines use a continuously operating unwind, in which a new machine reel brought to the unwind is joined at full speed to the tail of an emptying machine reel.
• the end of the web on the new machine reel is prepared with a splice using a double-sided adhesive tape to join the end of the web to the surface of the reel.
• the surface speed of the new machine reel is accelerated to be as close as possible to the running speed of the machine, after which the web of the emptying machine reel is pressed onto the above-mentioned splice by means of a roll.
• the old web is cut with a knife on the trailing side of the splice.
• the splicing device comprises a splice roll and a subsequent web guide roll as well as actuators moving said rolls.
• the splicing devices of the continuously operating unwind today generally employ a splice roll which usually has a thick soft rubber or similar surface.
• the core material of the splice roll is generally made of steel but it can also be made of another material, such as, for example, carbon fibre.
• the length of the splicing nip in the machine direction between the machine reel and the rubberized splice roll is of the order of 40 mm.
• Today, about 2500 - 8000 N/m is generally used as the linear load of the splice roll.
• the sequence constraint thus restricts the capacity of the coating machine located after the unwind station because speed must be limited.
• the sequence constraint also leads to an increase in the diameter of the web reel lifted by lifting arms from the primary station to the secondary station, and to growth in other structures, so that the need for space and the costs for the manufacture of the unwind will also increase.
• a change in web length during the splicing event causes a change in web tension when the splice roll moves against the machine reel.
• Web length generally increases, causing an increase in web tension and a change in web tension away from a tension value optimal from the point of view of splicing.
• a sudden increase in web tension increases the risk of a web break.
• a drawback is also that when the machine reel to be spliced has a carrot-shaped diameter profile, the splice roll is not able to conform to it, so that the adhesion of the splice will deteriorate and the risk of a web break will increase.
• An object of the invention is to provide improvements for a continuously operating unwind.
• An object of the invention is to provide a method in connection with a continuously operating unwind, and a continuously operating unwind in which the draw- backs encountered in the arrangements of the state of the art and the problems caused by them are avoided or at least substantially prevented.
• a particular object of the invention is to create a method in connection with a con- tinuously operating unwind, and a continuously operating unwind in which there is no sequence constraint.
• a particular object of the invention is to provide a method in connection with a continuously operating unwind, and a continuously operating unwind in which the problems caused by the unwinding tail of the bottom of the spliced reel and the paper shreds separating from it are eliminated or at least minimized.
• the method according to the invention is mainly characterized by what is stated in the characterizing part of claim 1.
• the unwind according to the invention for carrying out the method is in turn characterized by what is stated in the characterizing part of claim 10.
• the movement of the old machine reel, i.e. the machine reel expiring during the unwinding process, and the new machine reel, i.e. the machine to be unwound next, is substantially horizontal, and both the movement of the new machine reel and the movement of the old machine reel are arranged in linearly movable carriages such that the unwinding process begins on a first pair of carriages, which comprises a primary brake generator for control of tension, and by which the machine reel can be fetched, when needed, from a preceding storage/splice preparation station, which shortens the splicing sequence, thus enabling a thicker web to be spliced at higher speed.
• the reel is moved from the first pair of carriages to the second pair of carriages comprising a secondary brake generator or, alternatively, a secondary brake generator is mounted fixedly in place, in which case the secondary carriages are locked before the reel is moved and spliced.
• the second pair of carriages moves the bottom of the reel to a splicing position.
• the invention makes it also possible to control and minimize variation in the tension of the web during unwinding when the splice roll moves by synchronizing the movement of the bottom of the reel to be spliced with the movement of the splice roll.
• this can be accomplished arranging the movements of the splice roll and the reel bottom to be substantially parallel, so that the movement distances are the same and control is easier to accomplish.
• the movement of the splice roll and the roll bottom can also be accomplished by the structural principle of a set of articulated rolls, by mechanical or controlled synchronization.
• the minimization of the variation in web tension can also be accomplished by arranging in connection with the unwind a web guide means, for example, a web guide roll, which moves in a synchronized movement with the movement of the splice roll and is placed between the splice roll and the secondary brake generator, the splice roll and the web guide means being moved such that the web length re- mains constant.
• a web guide means for example, a web guide roll
• the unwind incorporates a combined cutting and guard device, which is thus used for cutting the web and, at the same time, for preventing paper shreds from entering the splicing nip.
• the cutting of the web is carried out by means of a cutting knife attached to a guard device being lowered from above, the cutting from above providing the advantage that the cutting device presses the tail to the splice roll and reduces the formation of wrinkles.
• a shred guard can be integrated into the cutting device.
• a web cutting device is placed in the unwind such that the cutting of the web takes place from under the web and, when needed, depending on the grade of the web and on the speed of the machine, a guard device is placed above.
• the cutting taking place from underneath provides the advantage that the placement of the cutting device is easier and the necessary movement distance is shorter than in the cutting taking place from above.
• parking the primary carriages askew makes it possible to ensure that the splicing nip is closed evenly, for example, based on position and/or force control, as known in itself.
• FIGS IA- 1C schematically show an operation sequence of the method in accordance with the invention.
• FIGS 2A-2C schematically show layout embodiments of the unwind in accordance with the invention.
• Figures 3A-3D schematically show embodiments of the method in accordance with the invention for control of web tension.
• Figures 4A-4D schematically show locations and movements of primary and secondary carriages and primary and secondary brake generators in an unwind during an operation sequence in connection with an advantageous embodiment of the method in accordance with the invention.
• Figure 5 schematically shows an embodiment of the invention when a "carrot- shaped" machine reel is spliced.
• a web that is being wound is denoted with the reference sign W
• a splice roll is designated by the reference numeral 12
• a web guide roll of a splicing device is designated by the reference numeral 11
• a new machine reel, from which unwinding is changed to take place after splicing is designated by the reference numeral 13
• an old machine reel from which the web is unwound before splicing, is designated by the reference numeral 10.
• a cutting knife of a cut- ting device of the web W is designated by the reference numeral 15. In splicing, the old web is brought close to the surface of the new machine reel 13 and the web is pressed to the surface of the machine reel 13 using the splice roll 12. The old web is cut with the cutting knife 15.
• a guard device 16 prevents paper shreds from entering a nip between the splice roll 12 and the new machine reel 13, i.e. a splicing nip, in connection with splicing.
• the splicing device thus comprises at least one other roll 11, which is an auxiliary roll and, at the same time, a web guide roll.
• the arrows SlO, S 12, S 13, S 16 designate the direction of movement of the part/device denoted with a corresponding reference numeral.
• the web W is unwound on the unwind from the old i.e. emptying machine reel 10 and the web W is passed over the web guide roll 11 to the next treatment stage, for example, to a coating machine (not shown).
• the new machine reel 13, i.e. the reel to be unwound next, is being moved towards a primary station of the unwind as shown by the arrow S13 and, at the same time, the old machine reel 10 is being moved from the primary station towards a secon- dary station as shown by the arrow SlO.
• the directions of movement SlO, S 13 of both the old and the new machine reel are substantially horizontal, or linear.
• the splice roll 12 is in a standby position.
• splice roll 12 is being moved, as shown by the arrow S 12, to a work position for splicing, which position as well as the corresponding running path of the web W are denoted with broken lines.
• the cut- ting knife 15 is also being moved to a work position for cutting.
• nip between the splice roll 12 and the new machine reel 13 is closed, splicing tapes are brought to the nip and the web W coming from the old machine reel 10 is cut with the cutting knife 15, i.e. a splice is made on the web coming from the new machine reel 13.
• the old machine reel 10 located in the secondary station is braked, and the nip between the splice roll 12 and the new machine reel 13 is opened, and the splice roll 12 and the cutting knife 15 are moved to the standby position.
• Figs. 2A-2C are schematic views of different layout alternatives in the method step according to Fig. 1C above.
• the unwind also comprises a guard device 16, which prevents paper shreds and the like from entering the splicing nip during splicing.
• the guard device 16 is used when needed, the web grade to be unwound and/or the speed of the machine being such that paper shreds are likely to be produced during splicing.
• the guard device 16 is placed above the unwind and, when needed, it is lowered down to a work position during the splicing operation and moved back to the standby position after splicing, as shown by the arrow S 16.
• the guard device 16 incorporates a cutting device 15, and therefore it always serves as a guard of the splicing nip during splicing.
• the guard device 16 and the cutting device 15 move together as shown by the arrow S 16, 15.
• the embodiment shown in Fig. 2A comprises a web guide member 17, such as a roll, a spreader bar, a curved plate or the like, which moves with a cutting device 15.
• the web is cut with the cutting device 15 from under the web.
• the web guide member 17 guides the run of the web W during cutting such that the cutting takes place as close as possible to the splicing nip, so that the tail of the web W will be short after cutting.
• the run of the web W is raised using the web guide member 17 such that the run of the web deflects in the portion between the secondary station and the splice roll.
• the transfer of the web W in the portion between the secondary station and the splice roll 12 is substantially straight, and the run of the web is guided by the splice roll 12. Cutting is performed with a cutting device 15 from under the web W.
• Figs. 3A-3A schematically show some embodiments for control of web tension between the emptying machine reel and the splicing nip during splicing in the method step shown in Fig. 1C.
• the tension of the web between the emptying machine reel 13 and the splicing nip is controlled during splicing in such a way that a brake generator located in the secondary station and coupled to the reel spool of the old, i.e. emptying, machine reel 10 moves substantially simultaneously with the splice roll 12. Movement directions are shown by the arrows SlO and S12. Since the movements SlO, S12 are substantially simultaneous, the length of the web does not change during splicing between the machine reel 10 and the next holding point, in this figure the splicing nip between the splice roll and the new machine reel 13. Since the movements SlO, S 12 take place simultaneously and the web length remains unchanged, no peak in web tension will occur during splicing.
• the tension of the web between the old machine reel 10 and the splicing nip is controlled during splicing in such a way that when the splice roll 12 moves to close the splicing nip between the splice roll 12 and the new machine reel 13, a web guide roll 11 located under the splice roll 12 moves at the same time, with the result that the web length does not change during splicing.
• the simultaneous movement of the splice roll 12 and the web guide roll 11 can be accomplished by coupling the splice roll 12 and the web guide roll 11 to each other mechanically to form a set of articulated rolls.
• the simultaneous movement of the splice roll 12 and the web guide roll 11 can also be accomplished such that both the splice roll 12 and the web guide roll 11 are independently movable and their movements are coupled to each other by means of position control.
• the tension of the web between the old machine reel 10 and the splicing nip is controlled during splicing in such a way that when the splice roll 12 moves to close the splicing nip between the splice roll 12 and the new machine reel 13, a web guide member 17 arranged above the splice roll 12 moves synchronously with the splice roll 12, with the result that the web length does not change during splicing.
• the web guide roll 11 ar- ranged under the splice roll 12 does not move during splicing.
• the web guide member 17 is placed under the web W and the cutting of the web W is carried out by a cutting device 15 from under the web W.
• the tension of the web between the old ma- chine reel 10 and the splicing nip is controlled during splicing in such a way that when the splice roll 12 moves to close the splicing nip between the splice roll 12 and the new machine reel 13, a web guide member 17 arranged above the splice roll 12 moves synchronously with the splice roll 12, with the result that the web length does not change during splicing. In that case, the web guide roll 11 ar- ranged under the splice roll 12 does not move during splicing.
• the web guide member 17 is placed above the web W and the cutting of the web W is carried out by a cutting device 15 from above the web W.
• a new machine reel 13, i.e. one to be unwound next, is being moved from a storage station towards the primary station of the unwind, as shown by the arrow S 13.
• the acceleration of the machine reel 13 to a splicing speed can be started, when needed, at this stage.
• the old machine reel 10 is being moved from the primary station towards a secondary station.
• the new machine reel 13 is in the primary station and the old machine reel 10 is in the secondary station. Unwinding still takes place from the old machine reel 10.
• the splice roll 12 is being moved to a work position for splicing.
• the nip between the splice roll 12 and the new machine reel 13 is closed, splicing tapes are brought to the nip and the web W running from the old machine reel 10 is cut with a cutting knife, i.e. a splice is made to the web running from the new machine reel 13.
• the old machine reel 10 located in the secondary station is braked, and the nip between the splice roll 12 and the new machine reel 13 is opened, and the splice roll 12 and the cutting knife 15 are moved to a standby position.
• Fig. 5 is a schematic view of an embodiment of the invention when a "carrot- shaped" machine reel is spliced, a uniform closing of the splicing nip being ensured by parking the primary carriages askew.
• the machine reel to be spliced has been placed in the carriages, it can be turned with respect to the splice roll in order that the nip shall close evenly in spite of the carrot shape.

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• Replacement Of Web Rolls (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

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ID=37482527

Family Applications (1)

Country Status (5)

Cited By (1)

Families Citing this family (3)

Citations (4)

Family Cites Families (1)

• 2006
  • 2006-11-10 FI FI20065707A patent/FI119634B/fi active
• 2007
  • 2007-10-23 CN CN2007800418561A patent/CN101535158B/zh active Active
  • 2007-10-23 DE DE112007002590.5T patent/DE112007002590B4/de active Active
  • 2007-10-23 AT AT0946207A patent/AT508281B1/de not_active IP Right Cessation
  • 2007-10-23 WO PCT/FI2007/050572 patent/WO2008056030A1/en active Application Filing

Patent Citations (4)

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