EP3403958B1 - Device and method for changing from continous to intermittent the forward movement of a film into a machine for the production of bags for flexible packaging - Google Patents
Device and method for changing from continous to intermittent the forward movement of a film into a machine for the production of bags for flexible packaging Download PDFInfo
- Publication number
- EP3403958B1 EP3403958B1 EP18172312.3A EP18172312A EP3403958B1 EP 3403958 B1 EP3403958 B1 EP 3403958B1 EP 18172312 A EP18172312 A EP 18172312A EP 3403958 B1 EP3403958 B1 EP 3403958B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- film
- calender
- dandy roll
- forward movement
- intermittent
- 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
Links
- 230000033001 locomotion Effects 0.000 title claims description 28
- 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
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 2
- 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
- 229920006280 packaging film Polymers 0.000 description 1
- 239000012785 packaging film Substances 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.
- Document JPH08217020 discloses a feed system for a packaging film with a dancer device driven by a servomotor.
- 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)
Description
- 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. Document
JPH08217020 - More particularly the 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.
- The formation of these bags requires the welds to be repeated several times so as to use temperatures which do not degrade the film used. The welds must then be cooled by cooling bars. This aspect, together with other multiple processes which have to be performed on the bags (welds at 45° to form the square base, longitudinal welds, markings, perforations, punching for rounded corners, etc.) mean that a production line can reach considerable lengths, even over 25 metres.
- These lines are made up of a first part in which the material to be processed is fed continuously through unwinders of the roll and drives which allow some operations to be performed which must necessarily be performed with the film in continuous movement, such as for example longitudinal folding and formation of gussets.
- 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.
- In order to switch movement from continuous to intermittent, the following are used in sequence: 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.
- In order to maintain the film fully taut during the various phases of processing there are normally two or more transport calenders in sequence, spaced and interspersed with various fittings with which the machine is provided, placed after the dandy roll for the purpose of interrupting the long section of the film, keeping it therefore always at a suitable tension.
- 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. On machines of a considerable length, in which the processes are performed in sequence, 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. During 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.
- More particularly, 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.
- These objects are achieved by the device according to the invention which has the features of the appended
independent claim 1. - Advantageous embodiments of the invention will be disclosed in the dependent claims.
- Substantially, 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.
- Further features of the invention will be made clearer by the following detailed description, referred to one of its embodiments purely by way of a non-limiting example, illustrated in the accompanying drawings, in which:
-
Figure 1 is a schematic perspective view of a possible bag which can be made with a machine incorporating the device according to the invention; -
Figures 2a and 2b are respectively a side view and a plan view from above of a complete line for the production of these types of bags; -
Figure 3 is a schematic view taken from the opposite side with respect toFigure 2a , showing the device according to the invention for changing from continuous to intermittent the forward movement of the film; -
Figure 4 is a plan view from above of the device ofFigure 3 ; -
Figure 5 is a section view taken along plane V-V ofFigure 4 ; - In
Figure 1 a bag orsack 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 foldedbase 2, anopen mouth 3 and a pair of side gussets 4. - It is obtained from a laminate in tape form, which is initially folded longitudinally over itself, then the lateral parts are folded towards the interior in order to create the gussets 4, followed by longitudinal welds along the four
edges 5, one of which serves to close the film in a tubular shape, while the others to increase the sealing of the bag. Atransverse weld 6 is then formed in order to close thebase 2 of the bag which could also be folded at 180° on itself and glued. - If
necessary welds 7 at 45° can also be provided to determine a so-called square base. Naturally the type of bag illustrated inFigure 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 byreference numeral 10, used for example for the production of the bag shown inFigure 1 . - A laminated
film 12 is unwound from aroll 11 and is made to move forwards continuously through a succession of stations SC1 .... SCn, and intermittently through a succession of stations SI1.... SIn. - The
device 100 according to the invention is placed between the stations SC and SI, which allows a continuous forward movement of the tape offilm 12 to be changed into intermittent forward movement. - In the stations SC1 ... SCn, 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 SI1 ... SIn 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.
- A description is now given of the
device 100 according to the invention which allows the changing from continuous to intermittent of the forward movement of thefilm 12 with reference toFigures 3 to 5 , in whichFigure 3 is a view taken from the opposite side with respect toFigure 2a , that is with forward movement of the film from right to left. - The
device 100 comprises adandy roll 20, placed between afeed calender 21 of thefilm 12 and atransport calender 22, and moves forwards and backwards, as indicated by the arrows inFigure 3 , synchronised with the operations that are performed in the stations downstream SI1 ... SIn. During the phase of forward movement of thefilm 12 theroll 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 theroll 20 moves is the resultant, i.e. the difference between the speed of thetransport calender 22 and that of thefeed calender 21. Naturally thetransport calender 22 is actuated at a speed greater than thefeed calender 21, having to recover the film remained upstream during the stopping phase. - The
feed calender 21 comprises a motorizedroller 23, actuated by a motor 25, and acounter roller 24. - Likewise, the
transport calender 22 comprises a motorizedroller 26 and acounter roller 27. - The
film 12 in output from thefeed calender 21 passes through a plurality ofidle rollers dandy roll 20 and going to thetransport calender 22. - The ends of the
shaft 40 of thedandy roll 20 are mounted onrespective shoes 41 sliding onlinear guides 42. - The
shoes 41 are restrained by means of respective L-shaped brackets 43 (Figure 5 ) to a pair oftoothed belts 44 each one wound around a respective pair ofpulleys - One of the two pulleys, in the example shown the
pulley 45 placed on one side of the machine, is actuated by aservomotor 50 by means of abelt 47, and is connected to thepulley 45 placed on the other side of the machine by means of ashaft 48, so that the torque of theservomotor 50 is transmitted simultaneously to both thelateral belts 44. - The maximum stroke of the
dandy roll 20 is determined by twolimit stoppers linear guide 42. -
Figure 3 shows respectively by unbroken lines and dotted lines two possible positions assumed by thedandy 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 thedandy 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 thefilm 12 proportional to the torque of the motor. - Along the section of the
film 12 at least one load cell is provided, in particular in the embodiment illustrated twoload cells 55 are provided on the axis of theidle roller 33 placed immediately upstream of thedandy roll 20 in order to monitor continuously the tension applied to thefilm 12 being processed and perform a "closed loop" control with PID (proportional-integrative-derivative) regulator. - The load cell could be installed also on the
dandy roll 20 or on other successive rolls. - 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 themotor 50, and therefore the movement of the system in order to maintain a constant tension on thefilm 12. When the tension decreases, more torque is supplied, whereas when the tension increases, less torque is supplied. - In this way, thanks to the motor drive used, it is possible to intervene instantaneously on the
dandy roll 20, avoiding successive regulations of the various stations of the machine in order to compensate the slippage of the film after the setting of the machine. - From what is disclosed, the advantages of the invention appear clear.
- Naturally the invention is not limited to the particular embodiment described previously and illustrated in the accompanying drawings, but numerous detail changes may be made thereto, within the reach of the person skilled in the art, without thereby departing from the scope of the invention, as defined by the appended claims.
Claims (9)
- Device (100) apt to change the forward movement of a film (12) into a machine (10) from continuous mode to intermittent mode for producing bags (1) for packaging and the like, comprising at least one dandy roll (20) mounted movably backwards and forwards between a feed calender (21) operating in continuous mode and a transport calender (22) operating in intermittent mode, the dandy roll (20) moving towards the transport calender (22) when the latter is operating, in order to feed the film (12) and moving in the opposite direction when the transport calender (22) is stopped in order to recover the input film coming from the feed calender (21), characterised in that a servomotor (50) is provided for the movement of said dandy roll (20), and in that at least one load cell (55) is provided along the path of the film (12) apt to continuously monitor the tension applied to the film (12) and to instantly change the torque applied to the servomotor (50).
- Device according to claim 1, characterised in that a PID regulator for a closed loop control is provided in combination with said at least one load cell.
- Device according to claim 1 or 2, characterised in that said at least one load cell (55) is placed on an idle roller (33) for the guide of the film (12) located immediately upstream of the dandy roll (20) or on another roller.
- Device as claimed in claim 1, 2 or 3, characterised in that said dandy roll (20) is mounted on a pair of lateral shoes (41) sliding on respective linear guides (42), said shoes (41) being driven by respective toothed belts (44) driven by said servomotor (50).
- Device according to claim 4, wherein said toothed belts (44) run around respective pairs of pulleys (45, 46), one of these pulleys (45) being actuated by the servomotor (50) by means of a belt (47) and being connected by means of a shaft (48) to the opposed pulley (45).
- Device according to claim 4 or 5, characterised in that two limit stoppers (51, 52) are arranged on said linear guides (42), apt to limit the maximum stroke of the dandy roll (20).
- Device according to any one of the preceding claims, wherein said feed calender (21) and transport calender (22) comprise a respective motorized roller (21), (26) and a respective counter roller (24), (27).
- Method for changing from continuous to intermittent the forward movement of a film (12) into a machine (10) for producing bags (1) for flexible packaging characterised by using the device according to claim 1, wherein the film (12) exiting from a feed calender (21) continuously operating is passed over a plurality of idle rollers (31, 32, 33) having fixed axis and over a dandy roll (20) movable backwards and forwards towards a transport calender (22) which operates intermittently, wherein it provides continuous monitoring of the tension applied to the film (12) by means of at least one load cell (55) provided along the path of the film (12) with instantaneous variation of the torque applied to a servomotor (50) for movement of said dandy roll (20).
- Machine (10) for the production of bags (1) for flexible packaging from a laminate film (12), comprising a plurality of stations SC1 ... SCn apt to perform operations on the film with continuous forward movement and a plurality of stations SI1 ... .SIn apt to perform operations on the film with intermittent forward movement, characterised in that a device (100) according to any one of claims 1 to 7 is provided between said stations SC1 ... SCn and said stations SI1...SIn to transform the forward movement of the film (12) from continuous mode to intermittent mode.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT102017000052937A IT201700052937A1 (en) | 2017-05-16 | 2017-05-16 | DEVICE AND METHOD TO TRANSFORM FROM CONTINUOUS TO INTERMITTENT THE MOVEMENT OF A FILM IN A MACHINE FOR THE PRODUCTION OF ENVELOPES FOR FLEXIBLE PACKAGING |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3403958A1 EP3403958A1 (en) | 2018-11-21 |
EP3403958B1 true EP3403958B1 (en) | 2019-09-11 |
Family
ID=60020361
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP18172312.3A Active EP3403958B1 (en) | 2017-05-16 | 2018-05-15 | Device and method for changing from continous to intermittent the forward movement of a film into a machine for the production of bags for flexible packaging |
Country Status (3)
Country | Link |
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EP (1) | EP3403958B1 (en) |
ES (1) | ES2761002T3 (en) |
IT (1) | IT201700052937A1 (en) |
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JP3623544B2 (en) * | 1995-02-16 | 2005-02-23 | 花王株式会社 | Feed amount shock absorber |
US6588641B2 (en) * | 2001-04-11 | 2003-07-08 | Prittie Family Trust 1989 | Method and apparatus for handling web |
US7438251B2 (en) * | 2003-06-19 | 2008-10-21 | Specialty Systems Advanced Machinery, Inc. | Web tensioning device with plural control inputs |
JP5880808B2 (en) * | 2011-04-21 | 2016-03-09 | 東洋製罐株式会社 | Bag making equipment |
US9309081B2 (en) * | 2013-10-15 | 2016-04-12 | 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/en unknown
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2018
- 2018-05-15 EP EP18172312.3A patent/EP3403958B1/en active Active
- 2018-05-15 ES ES18172312T patent/ES2761002T3/en active Active
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IT201700052937A1 (en) | 2018-11-16 |
ES2761002T3 (en) | 2020-05-18 |
EP3403958A1 (en) | 2018-11-21 |
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