EP0994058A1 - Automatische Wickelmaschine für kontinuierlich extrudrierte Plastikfolien - Google Patents

Automatische Wickelmaschine für kontinuierlich extrudrierte Plastikfolien Download PDF

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Publication number
EP0994058A1
EP0994058A1 EP98830610A EP98830610A EP0994058A1 EP 0994058 A1 EP0994058 A1 EP 0994058A1 EP 98830610 A EP98830610 A EP 98830610A EP 98830610 A EP98830610 A EP 98830610A EP 0994058 A1 EP0994058 A1 EP 0994058A1
Authority
EP
European Patent Office
Prior art keywords
film
winding
cutting unit
winding machine
roller
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.)
Withdrawn
Application number
EP98830610A
Other languages
English (en)
French (fr)
Inventor
Alessandro Macchi
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.)
Macchi Srl
Original Assignee
Macchi Srl
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Macchi Srl filed Critical Macchi Srl
Priority to EP98830610A priority Critical patent/EP0994058A1/de
Publication of EP0994058A1 publication Critical patent/EP0994058A1/de
Withdrawn legal-status Critical Current

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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
    • B65H19/00—Changing the web roll
    • B65H19/22—Changing the web roll in winding mechanisms or in connection with winding operations
    • B65H19/2238—The web roll being driven by a winding mechanism of the nip or tangential drive type
    • B65H19/2253—The web roll being driven by a winding mechanism of the nip or tangential drive type and the roll being displaced during the winding operation
    • B65H19/2261—Pope-roller
    • 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
    • B65H2301/4187—Relative movement of core or web roll in respect of mandrel
    • B65H2301/4189—Cutting
    • B65H2301/41893—Cutting knife moving on circular path
    • 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
    • B65H2301/50—Auxiliary process performed during handling process
    • B65H2301/51—Modifying a characteristic of handled material
    • B65H2301/515—Cutting handled material
    • B65H2301/5151—Cutting handled material transversally to feeding direction
    • 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
    • B65H2301/50—Auxiliary process performed during handling process
    • B65H2301/51—Modifying a characteristic of handled material
    • B65H2301/515—Cutting handled material
    • B65H2301/5153—Details of cutting means
    • B65H2301/51532—Blade cutter, e.g. single blade cutter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2403/00—Power transmission; Driving means
    • B65H2403/90—Machine drive
    • B65H2403/94—Other features of machine drive
    • B65H2403/942—Bidirectional powered handling device
    • 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
    • B65H2406/10—Means using fluid made only for exhausting gaseous medium
    • B65H2406/12—Means using fluid made only for exhausting gaseous medium producing gas blast

Definitions

  • the present invention relates to plants for the extrusion of plastic films, and in particular to an automatic winding machine to be combined with a continuous extrusion plant.
  • substantially continuous manufacturing processes are used in the production of industrial films, especially in the production of extruded films made from plastic materials such as low and high density polyethylene (LDPE, HDPE), ethylvinyl acetate (EVA) and similar extrudible thermoplastic materials.
  • plastic materials such as low and high density polyethylene (LDPE, HDPE), ethylvinyl acetate (EVA) and similar extrudible thermoplastic materials.
  • LDPE low and high density polyethylene
  • HDPE high density polyethylene
  • EVA ethylvinyl acetate
  • These productions employ various extrusion and coextrusion processes, both of single sheet linear films and tubular films, which can be wound up as such or as two single films by cutting the folding edges of the tube and separating the two sheets so as to wind them separately on two winding reels.
  • the terminal apparatus of any production line of continuous films is necessarily a winding machine suitable to form reels of film, wound around a tubular winding core, having a preset diameter or weight.
  • this winding machine For obvious reasons of compatibility of this winding machine with the continuous manufacturing process of the film, it must be able to cut the film upon completion of a reel, simultaneously starting to wind the film around a new tubular winding core while the complete reel is being discharged, in a completely automatic way.
  • the winding motion is typically achieved by contact between a motor-driven winding roller and the reel being wound which abuts on said roller, by exploiting the weight of the reel whose core is inserted on a mandrel whose ends are received in seats located at the ends of rotatable arms, which are driven by hydraulic cylinders.
  • An improvement over this solution is provided by the addition of a system for controlling the contact pressure between the reel and the motor-driven roller so as to assure a constant contact pressure while the reel weight increases.
  • This control is usually achieved by subjecting said hydraulic cylinders to an automatic system according to the pressure exerted by the reel on the motor-driven roller, said pressure being detected through load cells located on the roller supports and/or through the monitoring of the pulling tension exerted on the continuous film.
  • the motor-driven winding roller is generally provided with an outer rubber coating in order to increase the film pulling capacity and to favour a uniform tangential contact with the reel.
  • an outer rubber coating in order to increase the film pulling capacity and to favour a uniform tangential contact with the reel.
  • steel rollers without rubber coating, with a smooth or knurled surface are used for some kinds of film.
  • the roller may also be provided with a plurality of bores and a suction system so as to keep the film adherent to its surface.
  • a similar type of winding machine allows an advantageous simplification of the system for controlling the contact pressure between the reel and the roller by getting rid of the necessity of detecting the tension of the continuous film and/or the pressure on the roller while also completely eliminating the dependency from the (changing) weight of the reel during a complete winding cycle.
  • the mechanism which supports the reel and adjusts the contact pressure consists of a pair of carriages or slides, horizontally mobile in a direction essentially radial with respect to the rotation axis of the motor-driven roller.
  • the axis of the mandrel of the reel being wound lies substantially on the same plane of the rotation axis of the roller, whereby a perfectly constant contact pressure can be easily assured throughout the whole winding cycle by means of a stemless pneumatic cylinder or similar actuator, whose action can be doubled on both slides by using chain transmissions and other connecting members.
  • a stemless pneumatic cylinder or similar actuator whose action can be doubled on both slides by using chain transmissions and other connecting members.
  • Some winding machines also have the option of providing the winding mandrel with its own rotatory motion, automatically adjustable so as to keep the tangential velocity of the increasing reel adapted to the tangential velocity of the motor-driven roller, so as to reduce the occurrence of uneven tensions in the wound up film.
  • a so-called "gap winding” technique i.e. keeping the reel some millimeters away from the motor-driven winding roller and using only the winding mandrel's own rotatory motion.
  • the most sophisticated winding machines provide a choice between three operating modes according to the type of film to be processed, namely: a) winding by transmission of the motion from the motor-driven roller to the reel which is kept in contact at a constant pressure; b) winding by the own rotatory motion of the winding mandrel of the reel (gap mode); c) winding by contact and own rotation (mixed mode).
  • a winding machine patented by the same inventor of the present application is disclosed in the Italian patent n.1.260.574.
  • the automatic change of the reel takes place with the aid of a cutting unit parallel to the motor-driven roller and rotatable therearound in the same direction of rotation.
  • Said cutting unit essentially consists of a pair of small idle rollers between which a blade can slide transversely with respect to the film feed direction.
  • the reel change takes place by rotating the cutting unit around the motor-driven roller along the rear portion thereof, referring to the rear portion as the portion opposite to the area of contact with the reel being wound. Therefore, the cutting unit moves from its rest position in the lower half of the motor-driven roller to its operating position in the upper half of the roller, close to the area of contact with the reel (or to the area of gap crossing). In this way, the rollers of the cutting unit temporarily lift the film from the surface of the winding roller, while a new tubular core put on a winding mandrel, and having the outer surface made suitably adhesive, is carried into contact with the surface of the film on the motor-driven roller just upstream from the cutting unit.
  • the blade cuts the film and the film edge adherent to the adhesive surface of the new winding core starts to wind up thereon, thus resulting in a new reel.
  • the new reel being wound is rotated around the motor-driven winding roller and taken to its usual winding position, which is free from the removed reel, preceded by the cutting unit which completes the rotation and returns to its rest position.
  • winding machine to perform a reverse winding, i.e. a winding wherein the motor-driven roller rotates in the opposite direction with the film being pulled along the lower half thereof instead of the upper half.
  • a reverse winding i.e. a winding wherein the motor-driven roller rotates in the opposite direction with the film being pulled along the lower half thereof instead of the upper half.
  • Such a reversal of the winding direction allows to wind on the inside of the reel the film surface opposite to the surface which is usually wound on the inside, e.g. the outer surface of the extrusion "bubble" rather than the inner surface thereof.
  • the object of the present invention is to provide a winding machine suitable to overcome the above-mentioned drawbacks.
  • a first fundamental advantage of this kind of winding machine is that it can operate in a fully automatic way in both winding directions, with significant advantages as to safety, reliability and speed.
  • a further advantage of the present winding machine is that it provides an automatic change in the usual winding direction without requiring to make adhesive the outer surface of the new core, as it will be made clear further on. In this way, the preparation of the new cores is simplified and the handling thereof is made easier.
  • step I during the reverse winding the film F is fed to the lower portion of the motor-driven roller M which is in contact in its front portion with the reel C being wound.
  • the cutting unit T is in its rest position in the lower portion of the roller M, the film F passing between the latter and the cutting unit T, while the new core A carried by the replacement mandrel is in its waiting position above the roller M.
  • the cutting unit T conventionally includes a pair of idle rollers R located at the top, with a blade L sliding therebetween which is suitable to cut the film along the entire width thereof.
  • the blade L is usually mounted on the carriage of a stemless pneumatic cylinder P controlled through electric valves connected to a source of pressurized fluid, typically compressed air.
  • a novel feature of the winding machine according to the present invention is the presence of a "blowing bar” S, located close to the base of the cuffing unit T on the side opposite to the reel C when the cutting unit T is in its cutting position (step III).
  • Said "blowing bar” S extends along the whole width of the cutting unit T and is provided with one or more rows of bores, or a single elongated nozzle, as well as with an electric valve also connected to a source of pressurized fluid, preferably the same source supplying the actuator P of the blade L.
  • the function of this bar S will be clear from the following description of the operating steps of the automatic change of the present winding machine.
  • Step II illustrates the moment when the almost complete reel C is moved away from the roller M by translation of the horizontal supporting slides, or other type of mandrel supporting member, in order to allow the passage of the cutting unit T along the front portion of the roller M. Since the winding of the film F must continue also during said moving away, the reel C is maintained into rotation by means of the mandrel's own rotatory motion. In case the winding takes place during step I only by contact with the roller M, and not in mixed or gap mode as described above, the rotation of the mandrel is started in advance with respect to the removal of the reel C so as to have the time to synchronize the speed of the mandrel with the speed of the roller M.
  • Step III illustrates the movement of the cutting unit T to its cutting position in the upper portion of the roller M, slightly upstream from the point where the new winding core A comes down.
  • the cutting unit T takes along therewith the film F, thus moving upwards the point where the film leaves the surface of the roller M to go to the reel C.
  • the film F passes around the latter touching first the blowing bar S and then the roller R immediately above while in general it does not touch the other idle roller R (except in the case of a small diameter reel C).
  • Step IV illustrates the moment of the real change, when the new core A has been lowered in contact with the roller M prior to operating the blade L to cut the film F so as to remove the complete reel C.
  • the electric valve controlling the pneumatic cylinder of the blade L is opened
  • the electric valve of the bar S is opened so as to emit for some seconds a jet of air along the entire width of the film F.
  • the terminal edge E of the just cut film F is pushed by the jet of air so as to be "nipped" between the roller M and the new core A (having an adhesive surface) and to start winding thereon.
  • the roller M is preferably made with a surface suction system, so as to attract the edge E towards its surface and thus cooperate with the jet of air emitted by the bar S.
  • the cutting unit T goes back to its rest position through a reverse path with respect to the path described above, i.e. it passes again in front of the roller M, and the new reel follows it reaching its normal winding position as shown in step I.
  • the above-described novel type of winding machine is also advantageous in the automatic change of reels wound up in the usual direction in that it allows to get rid of cores prepared with an adhesive surface. This is still achieved thanks to the blowing bar S as diagrammatically shown in fig.2.
  • step I of fig.2 there is illustrated the winding in the usual direction of a reel C', which takes place with the passage of the film F along the upper portion of the reel M while the cutting unit T still has a rest position below the roller M.
  • the only difference with respect to the preceding case is the reversed rotation of the roller M and therefore of the reel C', while the structure of the winding machine does not require any modification.
  • Step II illustrates the situation just before the automatic change, when the cutting unit T has rotated to its cutting position, by passing along the rear portion of the roller M and thus slipping under the film F, and the new core A has come down into contact with the roller M just upstream from the cutting unit T.
  • the film F is still being wound on the reel C' by passing under the new core A and over the two rollers R of the cutting unit T.
  • the terminal edge E of the just cut film F is pushed by the jet of air to pass over the core A and therefore ends up being nipped between the latter and the roller M on the side opposite with respect to the cutting unit T. In this way, the winding of the new reel is started without having to make the core A adhesive.
  • the complete reel C' is moved away and the cutting unit T completes its rotation by passing in front of the roller M to go back to its rest position, followed by the new reel which reaches its winding position.
  • the cutting unit T may advantageously include a second blade higher than the blade L shown in the figures. This higher blade may be necessary in the case of large diameter reels wound up in the reverse direction, since in this situation (step III of fig.1) the film F may pass at a rather significant distance above the culling unit T.
  • blowing bar S may be made adjustable around its longitudinal axis so as to change the push angle of the jet of air according to the winding direction being used.
  • the push will be directed in a lower direction with respect to the case of fig.2 where the edge E must pass over the core A.
  • blowing bar S could be replaced by another kind of member suitable to provide a push to the terminal edge E, e.g. a retractable pusher or other mechanic means. Similar replacements of mechanically equivalent means are also possible with respect to the other members of the present winding machine.

Landscapes

  • Winding Of Webs (AREA)
  • Replacement Of Web Rolls (AREA)
EP98830610A 1998-10-14 1998-10-14 Automatische Wickelmaschine für kontinuierlich extrudrierte Plastikfolien Withdrawn EP0994058A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP98830610A EP0994058A1 (de) 1998-10-14 1998-10-14 Automatische Wickelmaschine für kontinuierlich extrudrierte Plastikfolien

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98830610A EP0994058A1 (de) 1998-10-14 1998-10-14 Automatische Wickelmaschine für kontinuierlich extrudrierte Plastikfolien

Publications (1)

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EP0994058A1 true EP0994058A1 (de) 2000-04-19

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EP98830610A Withdrawn EP0994058A1 (de) 1998-10-14 1998-10-14 Automatische Wickelmaschine für kontinuierlich extrudrierte Plastikfolien

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004021878A1 (de) * 2003-12-03 2005-07-14 Plamex Maschinenbau Gmbh Kontaktfolienwickler für linksdrehendes Aufwickeln mit Leitwalzen-Positioniersystem
EP1659080A1 (de) * 2004-11-18 2006-05-24 Kiefel Extrusion Gmbh Verfahren und Vorrichtung zum Rechts- und Linksdrehenden Aufwickeln von Materialbahnen
DE102005004762A1 (de) * 2005-02-01 2006-08-17 Plamex Maschinenbau Gmbh Verfahren zur Trennung von Folien bei linksdrehenden Kontaktfolienwicklern
EP2532613A1 (de) * 2011-06-09 2012-12-12 Metso Paper Inc. Verfahren zum Aufrollen von Bahnen aus Fasermaterial und Aufroller
WO2013156036A1 (en) * 2012-04-18 2013-10-24 Jesco Holding Aps Winding apparatus for winding a web into a roll
CN108975022A (zh) * 2018-06-07 2018-12-11 营口中捷仕达隔板有限公司 超细玻璃纤维蓄电池隔板在线自动分切装置及其控制方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2083928A5 (de) * 1970-03-04 1971-12-17 Voith Gmbh
DE2423021A1 (de) * 1973-09-19 1975-04-30 Polygraph Leipzig Verfahren und vorrichtung zum kontinuierlichen wickeln von bahnfoermigem gut auf wickeltraeger
DE8715861U1 (de) * 1986-12-04 1988-01-21 Looser, Gottlieb, Balzers Einrichtung zum kontinuierlichen Wickeln von laufenden Materialbahnen
JPH05213499A (ja) * 1992-02-07 1993-08-24 Mitsubishi Heavy Ind Ltd リール枠替装置
DE4213712A1 (de) * 1992-04-25 1993-10-28 Reifenhaeuser Masch Maschine zum Aufwickeln einer bahnförmigen Kunststoffolie

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2083928A5 (de) * 1970-03-04 1971-12-17 Voith Gmbh
DE2423021A1 (de) * 1973-09-19 1975-04-30 Polygraph Leipzig Verfahren und vorrichtung zum kontinuierlichen wickeln von bahnfoermigem gut auf wickeltraeger
DE8715861U1 (de) * 1986-12-04 1988-01-21 Looser, Gottlieb, Balzers Einrichtung zum kontinuierlichen Wickeln von laufenden Materialbahnen
JPH05213499A (ja) * 1992-02-07 1993-08-24 Mitsubishi Heavy Ind Ltd リール枠替装置
DE4213712A1 (de) * 1992-04-25 1993-10-28 Reifenhaeuser Masch Maschine zum Aufwickeln einer bahnförmigen Kunststoffolie

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 17, no. 656 (M - 1521) 6 December 1993 (1993-12-06) *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004021878A1 (de) * 2003-12-03 2005-07-14 Plamex Maschinenbau Gmbh Kontaktfolienwickler für linksdrehendes Aufwickeln mit Leitwalzen-Positioniersystem
EP1659080A1 (de) * 2004-11-18 2006-05-24 Kiefel Extrusion Gmbh Verfahren und Vorrichtung zum Rechts- und Linksdrehenden Aufwickeln von Materialbahnen
DE102005004762A1 (de) * 2005-02-01 2006-08-17 Plamex Maschinenbau Gmbh Verfahren zur Trennung von Folien bei linksdrehenden Kontaktfolienwicklern
EP2532613A1 (de) * 2011-06-09 2012-12-12 Metso Paper Inc. Verfahren zum Aufrollen von Bahnen aus Fasermaterial und Aufroller
WO2013156036A1 (en) * 2012-04-18 2013-10-24 Jesco Holding Aps Winding apparatus for winding a web into a roll
US9555993B2 (en) 2012-04-18 2017-01-31 Jesco Holding A/S Winding apparatus for winding a web into a roll
CN108975022A (zh) * 2018-06-07 2018-12-11 营口中捷仕达隔板有限公司 超细玻璃纤维蓄电池隔板在线自动分切装置及其控制方法

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