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
  • B65H19/2207—Changing the web roll in winding mechanisms or in connection with winding operations the web roll being driven by a winding mechanism of the centre or core drive type
  • B65H19/2223—Turret-type with more than two 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
  • B65H18/00—Winding webs
  • B65H18/08—Web-winding mechanisms
  • B65H18/26—Mechanisms for controlling contact pressure on winding-web package, e.g. for regulating the quantity of air between web layers
• • 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
  • B65H19/30—Lifting, transporting, or removing the web roll; Inserting core
  • B65H19/305—Inserting core
• • 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
  • B65H2301/418—Changing web roll
  • B65H2301/4182—Core or mandrel insertion, e.g. means for loading core or mandrel in winding position
  • B65H2301/41828—Core or mandrel insertion, e.g. means for loading core or mandrel in winding position in axial 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
  • B65H2301/40—Type of handling process
  • B65H2301/41—Winding, unwinding
  • B65H2301/417—Handling or changing web rolls
  • B65H2301/418—Changing web roll
  • B65H2301/4185—Core or mandrel discharge or removal, also organisation of core removal
  • B65H2301/41852—Core or mandrel discharge or removal, also organisation of core removal by extracting mandrel from wound roll, e.g. in coreless applications
  • B65H2301/418523—Core or mandrel discharge or removal, also organisation of core removal by extracting mandrel from wound roll, e.g. in coreless applications by movement of the wound 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
  • B65H2301/418—Changing web roll
  • B65H2301/4185—Core or mandrel discharge or removal, also organisation of core removal
  • B65H2301/41856—Core or mandrel discharge or removal, also organisation of core removal by stripping core from mandrel or chuck, e.g. by spring mechanism
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2408/00—Specific machines
  • B65H2408/20—Specific machines for handling web(s)
  • B65H2408/23—Winding machines
  • B65H2408/231—Turret winders
  • B65H2408/2313—Turret winders with plurality of reel supporting or back-up rollers travelling around turret axis
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2408/00—Specific machines
  • B65H2408/20—Specific machines for handling web(s)
  • B65H2408/23—Winding machines
  • B65H2408/231—Turret winders
  • B65H2408/2315—Turret winders specified by number of arms
  • B65H2408/23155—Turret winders specified by number of arms with three arms
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2513/00—Dynamic entities; Timing aspects
  • B65H2513/10—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
  • B65H2701/00—Handled material; Storage means
  • B65H2701/10—Handled articles or webs
  • B65H2701/17—Nature of material
  • B65H2701/175—Plastic
  • B65H2701/1752—Polymer film
• • 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
  • B65H2801/81—Packaging machines

Definitions

• the present invention refers to a winding system for use in plastic films production lines, in particular extensible plastic films, and to a method for winding plastic film reels.
• the extensible plastic films also referred to as film stretch, is a product widely used in the packaging industry, representing the most common type of packaging in Europe and in the United States. There are several applications of such types of films and they cover most of the products used commonly, both for industrial and domestic purposes .
• Plastic films differ according to their composition which allows obtaining films with different characteristics among which the toughness, elongation, tensile strength, elastic memory, resistance to perforation, and so on and so forth, thus meeting the requirements of various applications .
• Plastic films can be made up of three or more layers made up for example from mixtures of linear low density polyethylene (LLDPE) , low and very low density polyethylene (LDPE, VLDPE, ULDPE) , metallocene-based polyolefin (mLLDPE, mPP) , ethylene-vinyl-acetate in various percentages (EVA from 9% to 28%) , polypropylene homopolymer, random or block copolymer, terpolymer (PP homo, PP copo, PP ter) or biodegradable materials (Mater-Bi, PLA) .
• LLDPE linear low density polyethylene
• LDPE low and very low density polyethylene
• mLLDPE metallocene-based polyolefin
• EVA ethylene-vinyl-acetate in various percentages
• PP homo, PP copo, PP ter terpolymer
• biodegradable materials Mater-Bi, PLA
• reels with an overall weight of 12.5 kg which are wound on cardboard cores approximately weighing 1.25 kg having an internal diameter of about 16 mm and have a band width equivalent to about 500 mm.
• the reels for manual use with an overall weight of about 2.5 kg and width of about 450 ⁇ 500 mm, on the other hand have cores with an internal diameter equivalent to 50 mm and weight of about 0.5 ⁇ 0.6 kg, thus resulting easier to handle and use without the help of machines . Therefore, a serious concern facing the industry is that of optimising the plastic films production lines with the aim of obtaining the utmost efficiency of such lines, automating them most possible to reduce possibility of mistakes to the minimum, quickening the production and simultaneously maintaining high flexibility characteristics.
• the plastic films production lines comprise extrusion, cooling and winding systems made up of a variable number of extruders, depending on the characteristics intended to be imparted to the product, arranged downstream of which are the winding systems which receive the extruded and cooled film and wind it into reels.
• the extrusion and cooling part is not particularly difficult in terms of flexibility, given that it is based on technologies already consolidated over the years . However, considering the high costs of such part, there arises the need to have high production volumes, considering the fact that the final products have a very low added value, thus implying the necessity to rely on large scale production in order to attain sufficient operating margins.
• a general object of the present invention is that of overcoming the abovementioned drawbacks of the prior art in an extremely simple, inexpensive and particularly functional manner.
• Another object of the present invention is that of providing a winding system for use in plastic films production lines capable of guaranteeing an ideal quality of the wound reels though operating at high production speeds .
• a further object is that of providing a winding system for use in plastic films production lines requiring less amount of time for the steps of ejecting the full reel and inserting a new core.
• an object of the present invention is that of conceiving a method for winding plastic film reels capable of guaranteeing an ideal quality of the wound reels though operating at extremely rapid cycles.
• conceived was a winding system for use in plastic films production lines and a method for winding plastic film reels having the characteristics outlined in the attached claims .
• figure 2 shows a sectional schematic view of the winding system of figure 1;
• the winding system in question is indicated in its entirety by 100.
• the winding system 100 for use in plastic films production lines comprises a star-shaped winder holder 10 constrained against which is a plurality of winders 11-13 arranged around the same 10, each provided with a reel core 16 wound around which is a reel 19 of plastic film 18.
• the winders 11-13 are at least three so as to be able to simultaneously perform the operations of winding the reel, ejecting the full reels and inserting the cores on which the new reels are to be wound.
• the arrangement around the star- shaped winder holder 10 can be for example with pitches respectively of 120°.
• the winders 11-13 are preferably controlled by means of alternating motors, for example controlled by an inverter, and installed coaxially. Furthermore, provided for at one end of the winders 11-
• the tailstocks 15 are preferably provided with pneumatic movement.
• the star-shaped flange 14 is shaped in such a manner to facilitate the passage of a core 17 wound around which shall be a film 18 upon the subsequent replacement and a fully wound reel 19 of a film 18 respectively.
• the flange 14 has a plurality of cavities substantially of the same size as the section of a reel core 16 and/or substantially of the same size as the section of a full reel 19.
• a suitable motorisation adapted to control the winding of the film 18 at a determined winding speed around the winder 11 which is at such angular position.
• a drawing and pressure device 36 adapted to regulate the tensioning of the film 18 during winding.
• drawing and pressing device 36 comprises at least one cylinder 20 which during the winding of the film 18 on the winder 11-13 is in contact with the respective winder 11-13 and provides, along with a rubber roller 21, a device for drawing the film 18 itself.
• Such cylinder 20 is connected to a pair of levers controlled in movement through pneumatic pistons, preferably provided with hydraulic breaking, and constrained to rotate around a torsion axis 22.
• the abovementioned device 36 has a rotational movement around the axis 22 controlled by pneumatic pistons 23 with the aim of always maintaining the contact pressure constant on the reel.
• a blade 24 for cutting the film 18 upon termination of the step of winding an entire reel 19 of film is provided for at the winding position.
• the removal and reinsertion of the transverse cutting blade 24 is controlled by a pair of pneumatic cylinders 25.
• special contact means 26 which maintain the contact with the reel being wound constant, also during the replacement step.
• each winder 11-13 is provided with special contact means 26-28 which follow the rotation movement of the related winder 11-13 during the entire cycle, thus not constantly requiring returning to the winding position again. In such manner, it is not necessary to provide a special synchronisation between the movement of the contact means 26-28 and the movement of the winders 11- 13.
• the contact means 26-28 are made up of an anodised and motorised steel cylinder.
• the constant contact with the reel is advantageously provided for by means of a pneumatically controlled lever mechanism with adjustable pressure.
• a pneumatically controlled lever mechanism with adjustable pressure provided for is also a guide for the last meters of the film, which otherwise, during the replacement step in which the star-shaped winder holder 10 is rotated from the position in figure 3 to the position in figure 4, would be without contact and thus would cause the absorption of air.
• Such cylinders of the contact means 26-28 are preferably controlled, through a belt drive, by an alternating motor controlled by an inverter.
• the final drive occurs by means of a telescopic cardanic joint.
• the abovementioned parts just like the motorisations of the winders 11-13, reel cores 16 and tailstocks 15, are installed on the star-shaped winder holder 10 which rotates in a unidirectional manner.
• the rotation of the star-shaped winder holder 10 is preferably controlled by a gear motor 29 controlled by an inverter and connected by means of a driving belt .
• the control of the position of the star-shaped winder holder 10 is ensured by an absolute encoder mounted in axis with the gear motor 29, while the maintenance of the position is provided for by a disk brake operated pneumatically (not represented in the figure) .
• a distinctive characteristic of the winding system 100 according to the present invention consists in the fact that the control and command part of all the parts installed in the star-shaped winder holder 10 is ensured by the apparatus installed on a rotating plate coaxial to the star-element 10 itself .
• processing means such as for example a PLC (programmable logic controller) , motor inverters and the required power parts, as well as the regulation and control valves of the pneumatic cycle.
• PLC programmable logic controller
• a collector with three phase rings one of which is of the mercury type for connecting with the processing means of the line and one of the pneumatic power supply, provide for supplying the star-shaped winder holder 10.
• the removal of the full reels 19 is performed by a mechanical arm 30 which slides on a linear guide 31 controlled by a gear motor 32.
• insertion of the cores 17 occurs by means of a ring 33 which slides on a second linear guide 34, also controlled by a gear motor 35.
• the operation of the winding system 100 is as follows. During the normal winding, the film 18 is wound on the winder 11 which is arranged at the winding position, that is in contact with the drawing and pressure device 36 (figure 3) .
• the so-called replacement step is performed, wherein a second winder 12 is initially started up at a peripheral speed slightly higher with respect to the winding one. Subsequently, the star-shaped winder holder 10 rotates for a predetermined angular portion, for example 120° clockwise with reference to the implementation, moving the second winder 12 to the winding position (figure 5) .
• the contact means 26 corresponding to the first winder 11 never lose contact with the winder itself, thus constantly guaranteeing the "squeezing out” of the air between the turns .
• the rotation speed of the star-shaped winder holder 10, summed with the peripheral speed of the winder 11, leads to further tensioning of the film 18.
• Such rotation further moves the film 18 to the cutting position where the blade 24 (figure 6) intervenes, without the risk of the film 18 being lost during the passage from the first winder 11 to the second 12.
• the film 18 is also precharged by- means of an electrostatic discharge thus being attracted towards the core 17 of the reel core 16 of the winder 12 without requiring glues or adhesives.
• the same means 27 are provided with a housing or anti- adherent cover (not shown) which allows the film 18 to slide without hindrance.
• the contact means 27 relative to the second winder 12 are arranged in contact with the corresponding reel core 16, and where they remain up to the subsequent replacement cycle.
• the contact means 26-28 are single and common to all the winders 11-13, upon termination of the step of winding the end of the cut film 18, the contact means 26-28 oscillate backwards thus returning to the winding position and in contact with the reel being wound on the second winder 12 shortly after the start of such step.
• the star- shaped flange 14 removes the tailstocks 15 that support the reel cores 16 relative to the winders 13 and 11, in such a manner to be able to insert a new core 17 on the third winder 13 and simultaneously eject the reels 19 wound on the first winder 11 (figure 7) .
• the operations of ejecting the full reel 19 and inserting the new core 17 occur simultaneously by means of special mechanical actuators 30 and 33 which operate at high speeds .
• the winding system 100 is capable of considerably reducing the replacement times and thus obtain production speeds when winding reels for manual use similar to the production speeds for "jumbo" reels.
• the operating cycle generally lasts for about 15 seconds .
• Such winding system can be prepared both for winding reels with an internal core equivalent to 50 mm, that is reels for manual use, and for winding reels on cores of 76 mm, that is reels for use in automatic machines, thus offering a high degree of flexibility.
• the winding system can also be used on production lines having a multiple finished band measuring 1 metre according to a chequered disposition of the winding devices, which thus also allows the simultaneous production of reels on 50 mm reel cores and reels on 16 mm reel cores, further increasing the flexibility of the production lines, due to the possibility of differentiating the final result of the work without adjusting any parameter of the line.
• the winding system for use in plastic films production lines according to the invention can be implemented differently with respect to the implementation described and illustrated strictly for exemplifying and non-limiting purposes.

Landscapes

• Winding Of Webs (AREA)
• Replacement Of Web Rolls (AREA)
• Storage Of Harvested Produce (AREA)
• Packaging Of Special Articles (AREA)
• Manufacture Of Macromolecular Shaped Articles (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=40313843

Family Applications (1)

Country Status (10)

Cited By (1)

Families Citing this family (14)

Citations (2)

Family Cites Families (12)

• 2007
  • 2007-10-18 IT IT002018A patent/ITMI20072018A1/it unknown
• 2008
  • 2008-10-08 EP EP08839615A patent/EP2212228A1/de not_active Withdrawn
  • 2008-10-08 RU RU2010112770/13A patent/RU2010112770A/ru not_active Application Discontinuation
  • 2008-10-08 CN CN2008801119434A patent/CN101827769B/zh not_active Expired - Fee Related
  • 2008-10-08 WO PCT/IB2008/002692 patent/WO2009050556A1/en active Application Filing
  • 2008-10-08 BR BRPI0817886 patent/BRPI0817886A2/pt not_active Application Discontinuation
  • 2008-10-08 CA CA 2700350 patent/CA2700350A1/en not_active Abandoned
  • 2008-10-08 JP JP2010529466A patent/JP2011500476A/ja active Pending
  • 2008-10-08 KR KR20107007498A patent/KR20100077158A/ko not_active Application Discontinuation
  • 2008-10-08 US US12/733,692 patent/US20100294873A1/en not_active Abandoned

Patent Citations (2)

Non-Patent Citations (1)

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