EP2531430B1 - Method for interleaving chemical pulp sheets and a sheeter - Google Patents

Method for interleaving chemical pulp sheets and a sheeter Download PDF

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Publication number
EP2531430B1
EP2531430B1 EP10838751.5A EP10838751A EP2531430B1 EP 2531430 B1 EP2531430 B1 EP 2531430B1 EP 10838751 A EP10838751 A EP 10838751A EP 2531430 B1 EP2531430 B1 EP 2531430B1
Authority
EP
European Patent Office
Prior art keywords
pulp
sheet
sheets
overlapping
level
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP10838751.5A
Other languages
German (de)
French (fr)
Other versions
EP2531430A1 (en
EP2531430A4 (en
Inventor
Heikki Roihupalo
Oili Saarivirta
Jukka Sarin
Juha-Pekka Kisonen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Technologies Oy
Original Assignee
Valmet Technologies Oy
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Filing date
Publication date
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Publication of EP2531430A1 publication Critical patent/EP2531430A1/en
Publication of EP2531430A4 publication Critical patent/EP2531430A4/en
Application granted granted Critical
Publication of EP2531430B1 publication Critical patent/EP2531430B1/en
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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
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/66—Advancing articles in overlapping streams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H35/00—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers
    • B65H35/04—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers from or with transverse cutters or perforators
    • B65H35/08—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers from or with transverse cutters or perforators from or with revolving, e.g. cylinder, cutters or perforators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/24—Delivering or advancing articles from machines; Advancing articles to or into piles by air blast or suction apparatus
    • B65H29/241—Suction devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/66—Advancing articles in overlapping streams
    • B65H29/6609—Advancing articles in overlapping streams forming an overlapping stream
    • B65H29/6618—Advancing articles in overlapping streams forming an overlapping stream upon transfer from a first conveyor to a second conveyor advancing at slower speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/68—Reducing the speed of articles as they advance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/68—Reducing the speed of articles as they advance
    • B65H29/686—Pneumatic brakes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/30—Suction means
    • B65H2406/35—Other elements with suction surface, e.g. plate or wall
    • B65H2406/351—Other elements with suction surface, e.g. plate or wall facing the surface of the handled material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2601/00—Problem to be solved or advantage achieved
    • B65H2601/20—Avoiding or preventing undesirable effects
    • B65H2601/21—Dynamic air effects
    • B65H2601/211—Entrapping air in or under the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/84—Paper-making machines

Definitions

  • the invention relates to a sheeter or sheet cutter for a chemical pulp drying machinery.
  • a pulp web is cut lengthwise and cross direction into sheets, which then are stacked as bales for storage and transportation immediately after the cutting.
  • the speed of the process has been constrained by the stacking phase, problems related to which have been eliminated by arranging a conveying section where the sheets' speed is slowed down between the cutter and the piling Interleaving of overlapping of the sheets in the running direction is a prerequisite for slowing down the speed, i.e. successive sheets are arranged slightly on top of each other.
  • Such a sheet cutter and overlapping arrangement is presented in the patent specification FI111446B , for example.
  • the overlapping of the sheets is done by implementing a step down on the track level and by slowing down the speed after the step, thereby settling the sheets partly on top of each other on the overlapping level after running past the step.
  • This known arrangement has reached operating speed of approximately 200 - 250 m/min. When the speed is increased above this, the trajectory of the sheets no longer follows a desired flow.
  • the problem is that the relatively heavy sheet strives to maintain its trajectory as it passes the overlapping step and the sheet's trailing edge does not descent sufficiently, so that the leading edge of the following sheets easily hits the trailing edge of the previous sheets and thus disturbs the overlapping.
  • a solution for previously described problem has been achieved by, at the point of dropping the pulp sheet, arranging an essentially free discharge for the air that compresses under the sheet at least at the region of the sheet's trailing edge.
  • the discharge of the compressing air is enhanced with suction
  • the length of this section of the track does not need to be very long, e.g. having a magnitude of approximately half of the sheet's length. If suction is used, it does not need to be very strong. What is essential is to get the trailing edge of a sheet that has passed the overlapping step to descend below the level of the followings sheet's leading edge on the track section. By utilizing this track section running stabilizes and speeds of over 300 m/min and even over 400 m/min can be achieved at the cutter.
  • the object of the present invention is also a pulp drying machine's sheet cutter for cutting pulp web into pulp sheets and overlapping and stacking pulp sheets into pulp bales, which sheet cutter comprises a slitting machine and a cross section cutter arranged to cut the pulp web into pulp sheets, a step down in the track level for overlapping the pulp sheets on the overlapping level located after the down step, and a receiving conveyor arranged to receive the overlapped pulp sheets and to convey them to be stacked at the sheet layer It is characteristic of the sheet cutter that at least an essential part of the overlapping level's initial section's surface has an flow connection to the surroundings.
  • the corresponding basic components and the characterizing flow connection to the surroundings have been implemented by perforations penetrating the initial section of the overlapping level.
  • the perforations penetrating the initial section of the overlapping level are connected to suction means.
  • a broke lid's top equipped with perforations and included in the broke sheet route, acts as an overlapping level, the space underneath the broke lid advantageously having a vacuum.
  • the solution according to the invention is particularly suitable for handling chemical pulp sheets because chemical pulp sheets are sufficiently heavy and have a rigid structure, so they react to suction in a favorable manner.
  • a further advantage invention is that the height of overlapping step can be diminished compared to previously applied structures, which makes the trajectory of the pulp sheets straighter in the horizontal plane.
  • a web from a drying device is fed to a slitter 2 aided by a drawing device 1, and further on to a drawing press 3.
  • the web advances from the drawing press 3 to a cross section cutter, which includes a cross section cutter drum 4 and a fixed counter blade 5.
  • the sheets pass from the cross section cutter between sheet guiders 6 over a broke lid 7 to a receiving conveyor 8.
  • a step down is arranged on sheets' conveying section between the broke lid and the receiving conveyor.
  • the sheets advance further to a sheet layer 14 for stacking via press wheels, a roller arrangement and a sheet conveyor 9.
  • the broke lid 7 on the conveying section can be flipped up and it is intended to guide cut sheets during a malfunction on to a broke conveyor 15 located beneath the sheet cutter.
  • Figure 2 illustrates a part of the track section, to which a drop down is arranged on the conveying section enabling the overlapping of the sheets.
  • the broke lid described in the context of figure 1 located on the conveying section slightly differing from the arrangement according to figure 1 , is utilized as a step down.
  • the top surface of the lid 21, operating as a overlapping level, is located below the sheet's trajectory set by sheet guide rollers 6 for forming a step down.
  • This perforation can prevent the formation of an air cushion under the sheet passing over the lid, so that the sheet can descend without obstructions on lid's surface and the trailing edges of the sheets can descend after the step down.
  • the overlapping occurs on the broke lid's top 21.
  • the track speed after the overlapping step is descending and therefore, above the broke lid's top, the leading edge of each sheet settles on top of the trailing edge of the sheet in front resulting in the sheets to partly overlap each other.
  • the sheets gravitate after the step immediately towards the surface of the broke lid's top without bouncing or otherwise distracting the overlapping of following sheets.
  • a sheet cutter according to the invention can process a pulp web having a weight per square meter of e.g. 800 - 1300 g/m 2 .
  • the pulp sheets can have a length of e.g. 800 - 920 mm and a width of e.g. 670 - 800 mm.
  • the invention is not limited to using these exemplary parameters.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Sanitary Thin Papers (AREA)
  • Wrappers (AREA)

Description

    Field of the invention
  • The invention relates to a sheeter or sheet cutter for a chemical pulp drying machinery.
    • Background of the invention
  • In a chemical pulp drying machine's sheet cutter, a pulp web is cut lengthwise and cross direction into sheets, which then are stacked as bales for storage and transportation immediately after the cutting. The speed of the process has been constrained by the stacking phase, problems related to which have been eliminated by arranging a conveying section where the sheets' speed is slowed down between the cutter and the piling Interleaving of overlapping of the sheets in the running direction is a prerequisite for slowing down the speed, i.e. successive sheets are arranged slightly on top of each other. Such a sheet cutter and overlapping arrangement is presented in the patent specification FI111446B , for example.
  • The overlapping of the sheets is done by implementing a step down on the track level and by slowing down the speed after the step, thereby settling the sheets partly on top of each other on the overlapping level after running past the step. This known arrangement has reached operating speed of approximately 200 - 250 m/min. When the speed is increased above this, the trajectory of the sheets no longer follows a desired flow. The problem is that the relatively heavy sheet strives to maintain its trajectory as it passes the overlapping step and the sheet's trailing edge does not descent sufficiently, so that the leading edge of the following sheets easily hits the trailing edge of the previous sheets and thus disturbs the overlapping.
    • Summary of the invention
  • A solution for previously described problem has been achieved by, at the point of dropping the pulp sheet, arranging an essentially free discharge for the air that compresses under the sheet at least at the region of the sheet's trailing edge. As a special feature of the invention, the discharge of the compressing air is enhanced with suction The length of this section of the track does not need to be very long, e.g. having a magnitude of approximately half of the sheet's length. If suction is used, it does not need to be very strong. What is essential is to get the trailing edge of a sheet that has passed the overlapping step to descend below the level of the followings sheet's leading edge on the track section. By utilizing this track section running stabilizes and speeds of over 300 m/min and even over 400 m/min can be achieved at the cutter.
  • The object of the present invention is also a pulp drying machine's sheet cutter for cutting pulp web into pulp sheets and overlapping and stacking pulp sheets into pulp bales, which sheet cutter comprises a slitting machine and a cross section cutter arranged to cut the pulp web into pulp sheets, a step down in the track level for overlapping the pulp sheets on the overlapping level located after the down step, and a receiving conveyor arranged to receive the overlapped pulp sheets and to convey them to be stacked at the sheet layer It is characteristic of the sheet cutter that at least an essential part of the overlapping level's initial section's surface has an flow connection to the surroundings.
  • In a sheet cutter according to a specific feature of the invention, the corresponding basic components and the characterizing flow connection to the surroundings have been implemented by perforations penetrating the initial section of the overlapping level. According to a specific feature of the invention, the perforations penetrating the initial section of the overlapping level are connected to suction means.
  • For carrying out the invention, a broke lid's top, equipped with perforations and included in the broke sheet route, acts as an overlapping level, the space underneath the broke lid advantageously having a vacuum.
  • The solution according to the invention is particularly suitable for handling chemical pulp sheets because chemical pulp sheets are sufficiently heavy and have a rigid structure, so they react to suction in a favorable manner.
  • A further advantage invention is that the height of overlapping step can be diminished compared to previously applied structures, which makes the trajectory of the pulp sheets straighter in the horizontal plane.
    • Brief description of the drawings
    • Figure 1 shows a side view of a sheet cutter according to the prior art.
    • Figure 2 shows a sheet cutter according to an embodiment of the invention.
    Detailed description of the invention
  • In a known sheet cutter described in figure 1, a web from a drying device is fed to a slitter 2 aided by a drawing device 1, and further on to a drawing press 3. The web advances from the drawing press 3 to a cross section cutter, which includes a cross section cutter drum 4 and a fixed counter blade 5. The sheets pass from the cross section cutter between sheet guiders 6 over a broke lid 7 to a receiving conveyor 8. A step down is arranged on sheets' conveying section between the broke lid and the receiving conveyor. The sheets advance further to a sheet layer 14 for stacking via press wheels, a roller arrangement and a sheet conveyor 9. On the section between the receiving conveyor 8 and the sheet conveyor 9 the movement of the sheets is decelerating, the slowing down thus enabling the stacking to be done at a sufficiently low sheet progression speed and therefore without problems while the machine speed remains in the previously mentioned range. The broke lid 7 on the conveying section can be flipped up and it is intended to guide cut sheets during a malfunction on to a broke conveyor 15 located beneath the sheet cutter.
  • Figure 2 illustrates a part of the track section, to which a drop down is arranged on the conveying section enabling the overlapping of the sheets. In this embodiment, the broke lid described in the context of figure 1, located on the conveying section slightly differing from the arrangement according to figure 1, is utilized as a step down. The top surface of the lid 21, operating as a overlapping level, is located below the sheet's trajectory set by sheet guide rollers 6 for forming a step down.
  • A narrow (short in the running direction of the sheets) perforation section 23, from which an essentially free flow connection to the surroundings has been arranged, is made to the leading side of the lid. This perforation can prevent the formation of an air cushion under the sheet passing over the lid, so that the sheet can descend without obstructions on lid's surface and the trailing edges of the sheets can descend after the step down. Thus, the overlapping occurs on the broke lid's top 21. The track speed after the overlapping step is descending and therefore, above the broke lid's top, the leading edge of each sheet settles on top of the trailing edge of the sheet in front resulting in the sheets to partly overlap each other. In consequence of preventing the formation of the air cushion, the sheets gravitate after the step immediately towards the surface of the broke lid's top without bouncing or otherwise distracting the overlapping of following sheets.
  • It is possible to achieve the structure described above alternatively by utilizing a vacuum device 22. Also in this structure, on the leading side of the lid, a narrow (short in the running direction of the sheets) perforation section (23) is made, from which a mild suction effect is achieved underneath the falling sheet through the broke lid 21, which arrangement enables an effective descending of the trailing edge of the sheets after the step down.
  • A sheet cutter according to the invention can process a pulp web having a weight per square meter of e.g. 800 - 1300 g/m2. The pulp sheets can have a length of e.g. 800 - 920 mm and a width of e.g. 670 - 800 mm. However, the invention is not limited to using these exemplary parameters.

Claims (4)

  1. Method for cutting dried chemical pulp web and stacking into pulp bales, in which method;
    - the pulp web is cut into sheet wide strips in the direction of the track,
    - the strips are cut into pieces of pulp sheets,
    - the pulp sheets are dropped on to a lower conveying track, to an overlapping level,
    - the running speed of the pulp sheets is lowered in order to set them at least partially overlapped with respect to each other in the direction of the track, and,
    - overlapped pulp sheets are stacked as pulp bales,
    characterized in that at the point of dropping the pulp sheet, an essentially free discharge for the air that compresses under the sheet has been arranged at least at the region of the sheet's trailing edge by providing a perforation section (23) with perforations penetrating the initial section of the overlapping level, and wherein a broke lid's top acts as the overlapping level.
  2. Method according to claim 1, characterized in that at the point of dropping the pulp sheet, the discharge of the air compressing under the sheet is enhanced with suction.
  3. Sheet cutter of a chemical pulp drying machine for cutting a pulp web into pulp sheets and overlapping pulp sheets and stacking them into pulp bales, which sheet cutter comprises;
    - a slitting machine (2) and a cross section cutter (4, 5), which are arranged to cut the pulp web into pulp sheets,
    - a step down in the track level for overlapping pulp sheets on an overlapping level (21) located after the step,
    - a receiving conveyor (8) arranged to receive overlapped pulp sheets and to convey them for stacking to the sheet layer (14),
    characterized in that at least an essential part of the overlapping level's (21) initial section's surface has a flow connection to the surroundings, and the flow connection of the overlapping level's initial section to the surroundings has been implemented by a perforation section (23) with perforations penetrating the initial section of the overlapping level, and wherein a broke lid's top acts as the overlapping level.
  4. Sheet cutter of a pulp drying machine according to claim 3, characterized in that the perforations penetrating the overlapping level's initial section are connected to suction means (22).
EP10838751.5A 2009-12-21 2010-12-20 Method for interleaving chemical pulp sheets and a sheeter Active EP2531430B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20096377A FI20096377A (en) 2009-12-21 2009-12-21 Procedure for overlapping cellulose sheets and sheet cutters
FI20105722A FI125860B (en) 2009-12-21 2010-06-22 Procedure for overlapping cellulose sheets and sheet cutters
PCT/FI2010/051064 WO2011077002A1 (en) 2009-12-21 2010-12-20 Method for interleaving chemical pulp sheets and a sheeter

Publications (3)

Publication Number Publication Date
EP2531430A1 EP2531430A1 (en) 2012-12-12
EP2531430A4 EP2531430A4 (en) 2013-11-27
EP2531430B1 true EP2531430B1 (en) 2016-10-12

Family

ID=41462835

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10838751.5A Active EP2531430B1 (en) 2009-12-21 2010-12-20 Method for interleaving chemical pulp sheets and a sheeter

Country Status (4)

Country Link
EP (1) EP2531430B1 (en)
ES (1) ES2609427T3 (en)
FI (2) FI20096377A (en)
WO (1) WO2011077002A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112140187A (en) * 2020-09-16 2020-12-29 广东龙晟制药有限公司 Traditional Chinese medicine decoction piece cutting and drying device and method thereof

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1148437B (en) * 1959-11-27 1963-05-09 Strecker Otto C Dr Kg Method of filing the sheets cut by a cross cutter
US4436302A (en) * 1981-05-28 1984-03-13 Beloit Corporation Apparatus for slowing down and preventing edge damage on moving sheets
FI111446B (en) * 1998-06-01 2003-07-31 Metso Paper Inc Arrangement in a pulp drying machine sheet cutter
DE10139405A1 (en) * 2001-08-17 2003-02-27 Jagenberg Querschneider Gmbh Device for cross-cutting material webs, in particular paper or cardboard webs
DE102006002029A1 (en) * 2006-01-13 2007-07-19 Bielomatik Jagenberg Gmbh + Co. Kg Braking device for stopping stacking of paper or cardboard sheets comprises clamping elements with annular clamping zones on a part of the periphery and a deviating unit arranged in the running direction of the sheets

Also Published As

Publication number Publication date
EP2531430A1 (en) 2012-12-12
FI125860B (en) 2016-03-15
FI20105722A0 (en) 2010-06-22
FI20105722A (en) 2011-06-22
ES2609427T3 (en) 2017-04-20
FI20096377A (en) 2011-06-22
EP2531430A4 (en) 2013-11-27
FI20096377A0 (en) 2009-12-21
WO2011077002A1 (en) 2011-06-30

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