EP3403958A1 - Vorrichtung und verfahren zum wechseln von kontinuierlicher zu intermittierender vorwärtsbewegung einer folie in eine maschine zur herstellung von beuteln für flexible verpackungen - Google Patents
Vorrichtung und verfahren zum wechseln von kontinuierlicher zu intermittierender vorwärtsbewegung einer folie in eine maschine zur herstellung von beuteln für flexible verpackungen Download PDFInfo
- Publication number
- EP3403958A1 EP3403958A1 EP18172312.3A EP18172312A EP3403958A1 EP 3403958 A1 EP3403958 A1 EP 3403958A1 EP 18172312 A EP18172312 A EP 18172312A EP 3403958 A1 EP3403958 A1 EP 3403958A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- film
- calender
- dandy roll
- transport
- forward movement
- 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.)
- Granted
Links
- 230000033001 locomotion Effects 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 238000009459 flexible packaging Methods 0.000 title claims description 5
- 238000000034 method Methods 0.000 title claims description 5
- 238000004806 packaging method and process Methods 0.000 claims abstract description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000005001 laminate film Substances 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 claims 1
- 239000000463 material Substances 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000003466 welding Methods 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Images
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
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
- B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
- B65H23/188—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web
- B65H23/1888—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web and controlling web tension
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
- B65H23/044—Sensing web tension
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H20/00—Advancing webs
- B65H20/24—Advancing webs by looping or like 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
- B65H2301/00—Handling processes for sheets or webs
- B65H2301/40—Type of handling process
- B65H2301/44—Moving, forwarding, guiding material
- B65H2301/449—Features of movement or transforming movement of handled material
- B65H2301/4491—Features of movement or transforming movement of handled material transforming movement from continuous to intermittent or vice versa
-
- 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)
- B65H2408/21—Accumulators
- B65H2408/217—Accumulators of rollers type, e.g. with at least one fixed and one movable roller
- B65H2408/2171—Accumulators of rollers type, e.g. with at least one fixed and one movable roller the position of the movable roller(s), i.e. the web loop, being positively actuated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2555/00—Actuating means
- B65H2555/20—Actuating means angular
- B65H2555/24—Servomotors
-
- 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
- B65H2701/19—Specific article or web
- B65H2701/191—Bags, sachets and pouches or the like
Definitions
- the object of the present invention is a device and a relative method for changing from continuous to intermittent the forward movement of a film into a machine for producing bags for flexible packaging, for containing foodstuffs for humans, animal feed, etc.
- bags in question are obtained from laminated and bonded films, for example polyester-aluminium-polyethylene, which are adequately shaped by means of longitudinal folding, formation of side gussets, longitudinal and transverse welds, folding of the base, etc.
- laminated and bonded films for example polyester-aluminium-polyethylene, which are adequately shaped by means of longitudinal folding, formation of side gussets, longitudinal and transverse welds, folding of the base, etc.
- Subsequent operations such as welding, punching, marking, etc. have instead to be performed with the film moving intermittently (start and stop), that is forward movement of the film and its stopping in order to perform the abovementioned operations.
- a pair of motorized rollers feed calender which work in continuous mode
- one or more compensation dandy rolls one or more pairs of motorized rollers (transport calenders) with intermittent motion.
- the function of the dandy roll is that of transferring material during the phase of forward movement of the film and accumulating material in arrival from the feed calender during the work phases, in which the film remains still.
- pneumatic pistons In order to tension the material both during the forward movement and during the operations performed on the same, in particular welding, pneumatic pistons are normally used which push the dandy roll with a force proportional to the pressure of the air fed inside the same pistons. This pressure however does not remain constant: during the phase of forward movement the air in the pistons compresses, whereas during the phase of stopping in which the dandy roll has to recover the film in arrival, the pressure tends to drop. This is because the feed of the dandy roll does not succeed in compensating fast the rapid movements of the dandy roll.
- This variation in the pressure causes a variation in the tension applied on the film in output from the dandy roll.
- this variation in tension is detrimental in that micro slippage is created on the film transport calenders coming after the dandy roll.
- This slippage means that the operations in sequence are not performed on the same portion of film and therefore the operator has to correct this slippage by moving the work stations in sequence in order to make the operations coincide.
- the phase of starting and stopping of the machine for product change, in which there is a variation in the speed of forward movement of the material and therefore a variation in the error due to the variable slippage, considerable product rejects are generated.
- the object of the invention is that of eliminating the disadvantages of the prior art illustrated previously.
- an object of the present invention is that of providing a device for changing from continuous to intermittent the forward movement of a film into a machine for producing bags for flexible packaging, such as for foodstuffs for humans, animal feed, etc., which allows the tension on the film to be maintained constant, such as to have possible constant slippage of the film on the calenders, which does not need additional corrections after the initial set-up of the machine.
- Another object of the invention is that of providing such a device which is simple and economical to produce, as well as highly reliable.
- the device according to the invention apt to change from continuous to intermittent the forward movement of a film into a machine for producing bags for packaging and the like, comprises at least one dandy roll mounted movably backwards and forwards between a feed calender which operates in continuous mode and a transport calender which operates in intermittent mode, the dandy roll moving towards the transport calender when the latter is operating in order to feed the film and moving in the opposite direction when the transport calender is stopped in order to recover the input film coming from the feed calender, wherein a servomotor is provided for the movement of said dandy roll, and wherein at least one load cell is provided along the path of the film apt to continuously monitor the tension applied to the film and to instantly change the torque applied to the motor.
- the load cell is used to have a "closed loop" control of the tension, i.e. with feedback.
- the motor which moves the dandy roll will activate the appropriate correction, receiving the information from a PID (proportional-integrative-derivative) controller.
- PID proportional-integrative-derivative
- a bag or sack 1 has been shown by way of example, apt to contain foodstuffs for humans, animal feed or other products, obtained from a laminate made up for example of polyester - aluminium - polyethylene.
- the bag 1 has a folded base 2, an open mouth 3 and a pair of side gussets 4.
- welds 7 at 45° can also be provided to determine a so-called square base.
- the type of bag illustrated in Figure 1 is purely an example, the device according to the invention being able to be used in any bags production line where it is foreseen to change the feeding of the film from continuous to intermittent.
- Figures 2a and 2b illustrate schematically a line or machine, denoted overall by reference numeral 10, used for example for the production of the bag shown in Figure 1 .
- a laminated film 12 is unwound from a roll 11 and is made to move forwards continuously through a succession of stations SC 1 .... SC n , and intermittently through a succession of stations SI 1 .... SI n .
- the device 100 according to the invention is placed between the stations SC and SI, which allows a continuous forward movement of the tape of film 12 to be changed into intermittent forward movement.
- stations SC 1 ... SC n in which the film moves forwards continuously, operations are performed such as longitudinal folding and formation of the lateral gussets 4, whereas in the stations SI 1 ... SI n in which the film moves forwards intermittently all the other operations are performed in which it is required for the film to be still, such as longitudinal trimming and welds, possible welds at 45°, transverse welding with several stages, stamping, transverse cutting, etc.
- Figure 3 is a view taken from the opposite side with respect to Figure 2a , that is with forward movement of the film from right to left.
- the device 100 comprises a dandy roll 20, placed between a feed calender 21 of the film 12 and a transport calender 22, and moves forwards and backwards, as indicated by the arrows in Figure 3 , synchronised with the operations that are performed in the stations downstream SI 1 ... SI n .
- the roll 20 moves forwards, yielding material, while during the phase of stopping of the film it moves in an opposite direction, recovering the input material.
- the speed with which the roll 20 moves is the resultant, i.e. the difference between the speed of the transport calender 22 and that of the feed calender 21.
- the transport calender 22 is actuated at a speed greater than the feed calender 21, having to recover the film remained upstream during the stopping phase.
- the feed calender 21 comprises a motorized roller 23, actuated by a motor 25, and a counter roller 24.
- the transport calender 22 comprises a motorized roller 26 and a counter roller 27.
- the film 12 in output from the feed calender 21 passes through a plurality of idle rollers 30, 31, 32, 33 before turning around the dandy roll 20 and going to the transport calender 22.
- the ends of the shaft 40 of the dandy roll 20 are mounted on respective shoes 41 sliding on linear guides 42.
- the shoes 41 are restrained by means of respective L-shaped brackets 43 ( Figure 5 ) to a pair of toothed belts 44 each one wound around a respective pair of pulleys 45, 46.
- One of the two pulleys in the example shown the pulley 45 placed on one side of the machine, is actuated by a servomotor 50 by means of a belt 47, and is connected to the pulley 45 placed on the other side of the machine by means of a shaft 48, so that the torque of the servomotor 50 is transmitted simultaneously to both the lateral belts 44.
- the maximum stroke of the dandy roll 20 is determined by two limit stoppers 51, 52 placed on each linear guide 42.
- Figure 3 shows respectively by unbroken lines and dotted lines two possible positions assumed by the dandy roll 20, respectively during the phase of recovery of the film in input and of yielding of the film to the stations downstream.
- the motor 50 which moves the dandy roll 20 supplies a torque proportional to the current which is supplied thereto, and therefore to the dandy roll 20 a force will be applied of driving of the film 12 proportional to the torque of the motor.
- At least one load cell is provided, in particular in the embodiment illustrated two load cells 55 are provided on the axis of the idle roller 33 placed immediately upstream of the dandy roll 20 in order to monitor continuously the tension applied to the film 12 being processed and perform a "closed loop" control with PID (proportional-integrative-derivative) regulator.
- PID proportional-integrative-derivative
- the load cell could be installed also on the dandy roll 20 or on other successive rolls.
- a control system On the basis of the tension detected by the load cells 55, a control system, not shown, to be considered in itself known, instantaneously changes the torque applied to the motor 50, and therefore the movement of the system in order to maintain a constant tension on the film 12.
- the tension decreases, more torque is supplied, whereas when the tension increases, less torque is supplied.
Landscapes
- Containers And Plastic Fillers For Packaging (AREA)
- Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
- Making Paper Articles (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT102017000052937A IT201700052937A1 (it) | 2017-05-16 | 2017-05-16 | Dispositivo e metodo per trasformare da continuo ad intermittente l’avanzamento di un film in una macchina per la produzione di buste per imballaggi flessibili |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3403958A1 true EP3403958A1 (de) | 2018-11-21 |
EP3403958B1 EP3403958B1 (de) | 2019-09-11 |
Family
ID=60020361
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18172312.3A Active EP3403958B1 (de) | 2017-05-16 | 2018-05-15 | Vorrichtung und verfahren zum wechseln von kontinuierlicher zu intermittierender vorwärtsbewegung einer folie in eine maschine zur herstellung von beuteln für flexible verpackungen |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3403958B1 (de) |
ES (1) | ES2761002T3 (de) |
IT (1) | IT201700052937A1 (de) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1249418A2 (de) * | 2001-04-11 | 2002-10-16 | Allan R. Prittie | Verfahren und Vorrichtung zum Handhaben einer Bahn |
WO2004113206A2 (en) * | 2003-06-19 | 2004-12-29 | Specialty Systems Advanced Machinery, Inc. | Web tensioning device with plural control inputs |
JP3623544B2 (ja) * | 1995-02-16 | 2005-02-23 | 花王株式会社 | 送り量緩衝装置 |
EP2700498A1 (de) * | 2011-04-21 | 2014-02-26 | Toyo Seikan Group Holdings, Ltd. | Beutelherstellungsvorrichtung |
US20150102152A1 (en) * | 2013-10-15 | 2015-04-16 | Kimberly-Clark Worldwide, Inc. | Active Center Pivot Device For Controlling Sheet Tension and Method of Using Same |
-
2017
- 2017-05-16 IT IT102017000052937A patent/IT201700052937A1/it unknown
-
2018
- 2018-05-15 EP EP18172312.3A patent/EP3403958B1/de active Active
- 2018-05-15 ES ES18172312T patent/ES2761002T3/es active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3623544B2 (ja) * | 1995-02-16 | 2005-02-23 | 花王株式会社 | 送り量緩衝装置 |
EP1249418A2 (de) * | 2001-04-11 | 2002-10-16 | Allan R. Prittie | Verfahren und Vorrichtung zum Handhaben einer Bahn |
WO2004113206A2 (en) * | 2003-06-19 | 2004-12-29 | Specialty Systems Advanced Machinery, Inc. | Web tensioning device with plural control inputs |
EP2700498A1 (de) * | 2011-04-21 | 2014-02-26 | Toyo Seikan Group Holdings, Ltd. | Beutelherstellungsvorrichtung |
US20150102152A1 (en) * | 2013-10-15 | 2015-04-16 | Kimberly-Clark Worldwide, Inc. | Active Center Pivot Device For Controlling Sheet Tension and Method of Using Same |
Also Published As
Publication number | Publication date |
---|---|
IT201700052937A1 (it) | 2018-11-16 |
EP3403958B1 (de) | 2019-09-11 |
ES2761002T3 (es) | 2020-05-18 |
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