EP2660159A1 - Procédé et machine pour le pliage de rabats thermosoudés au niveau des extrémités d'emballages - Google Patents

Procédé et machine pour le pliage de rabats thermosoudés au niveau des extrémités d'emballages Download PDF

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Publication number
EP2660159A1
EP2660159A1 EP13162631.9A EP13162631A EP2660159A1 EP 2660159 A1 EP2660159 A1 EP 2660159A1 EP 13162631 A EP13162631 A EP 13162631A EP 2660159 A1 EP2660159 A1 EP 2660159A1
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EP
European Patent Office
Prior art keywords
packages
compartments
conveyor
path portion
heat
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Withdrawn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
EP13162631.9A
Other languages
German (de)
English (en)
Inventor
Aldo ABLUTON
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.)
Carle and Montanari OPM SpA
Original Assignee
Carle and Montanari OPM SpA
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 Carle and Montanari OPM SpA filed Critical Carle and Montanari OPM SpA
Publication of EP2660159A1 publication Critical patent/EP2660159A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B19/00—Packaging rod-shaped or tubular articles susceptible to damage by abrasion or pressure, e.g. cigarettes, cigars, macaroni, spaghetti, drinking straws or welding electrodes
    • B65B19/02—Packaging cigarettes
    • B65B19/22—Wrapping the cigarettes; Packaging the cigarettes in containers formed by folding wrapping material around formers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B35/00—Supplying, feeding, arranging or orientating articles to be packaged
    • B65B35/10—Feeding, e.g. conveying, single articles
    • B65B35/24—Feeding, e.g. conveying, single articles by endless belts or chains
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/18—Applying or generating heat or pressure or combinations thereof by endless bands or chains
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
    • B65B61/24—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for shaping or reshaping completed packages

Definitions

  • the present invention relates to a method for folding heat-sealed flaps at the ends of packages.
  • the term "flow-pack” refers to packaging machines where the products to be packaged are transferred in a row and in positions spaced from one another in a packaging tube.
  • a packaging tube is formed by winding a continuous film of plastic material about the horizontal row of products, and by heat-sealing a longitudinal edge of such a film. While the packaging tube advances with the products, it is then transversally heat-sealed and cut so as to separate the packages. Therefore, each package remains sealed at a longitudinal flap and at two transversal flaps arranged at the ends.
  • Such two transversal flaps horizontally protrude with respect to the actual casing of the package, whereby they are usually folded downwards while the packages advance in a row upon exiting from the "flow-pack" machine.
  • the packages are first rotated so as to arrange the two flaps parallel to the advancing direction, and then passed between two lateral cams, shaped so as to bend the flaps downwards, respectively. Finally, while the flaps are pressed in vertical position, they are heated so as to stabilize the fold without melting the plastic material and/or damaging the packaged products.
  • the packaged products may be damaged by the heat provided for stabilizing the folding of the flaps if the packages must be stopped due to a temporary interruption of the packaging machine.
  • EP0268151A1 which corresponds to the preamble of claim 1, teaches the transfer of a stack of packages in vertical direction between two guiding walls which at the same time carry out a folding function on the lateral flaps of the packages.
  • the object of the present invention is to provide a method for folding heat-sealed flaps at the ends of packages, which method allows the above-described problem to be solved in a simple and cost-effective manner and in particular is carried out by a simple and compact machine, with a relatively small number of components and without defects or damage to the packages or products.
  • a method for folding heat-sealed flaps at the ends of packages is provided as defined in claim 1.
  • the present invention further relates to a machine for folding heat-sealed flaps at the ends of packages as defined in claim 11.
  • reference numeral 1 indicates as a whole a machine (partially shown) for folding heat-sealed flaps 2 arranged at the ends of packages 3, which are formed by a "flow-pack" packaging machine (not shown) arranged upstream of machine 1.
  • Each package 3 comprises an intermediate part which defines a casing or housing 4, accommodating one or more products, is elongated along a longitudinal axis 5, and is sealed by means of flaps 2 and by means of a lower longitudinal flap (not shown). While packages 3 enter into machine 1, they are aligned along a direction 8 and are equally spaced apart; at the same time, the flaps 2 of each package 3 horizontally protrude in opposite directions.
  • Machine 1 comprises a fixed support frame 9 (partially shown); an inlet 10; an outlet 11 ( figure 3 ), preferably arranged on a side which is opposite to that of inlet 10; and a transfer system 12 which is supported by frame 9 and conveys the row of packages 3 from inlet 10 to outlet 11.
  • the transfer system 12 comprises a conveyor 13 for transferring the row of packages 3 from inlet 10 along a horizontal path portion P1; a conveyor 14 ( figure 3 ) for transferring the row of packages 3 through the outlet 11 along a horizontal path portion P2; and a conveyor 15, which receives one package 3 at a time from conveyor 13 and transfers it towards conveyor 14.
  • the path portions P1 and P2 are rectilinear and parallel.
  • conveyor 15 comprises a plurality of compartments or pockets 16, which are sized so as to each receive a single package 3, are equally spaced apart along a circuit C and are movable along the circuit C under the action of a motor 17 ( figure 1 ).
  • Packages 3 are transferred over a part of circuit C, i.e. along a vertical path portion P3, preferably upwards, along a curved part portion P4 defining an inversion of the motion by 180° ( figure 1 ), and finally along a vertical path portion P5.
  • the path portions P1 and P3 intersect with each other so as to form a right angle deviation, without rotations of packages 3.
  • Motor 17 is controlled according to the position and speed of packages 3 arriving on conveyor 13 so as to align each compartment 16 with the path portion P1 when packages 3 arrive at the end of conveyor 13.
  • Packages 3 enter into the respective compartments 15 due to the horizontal inertia thrust imparted by the advancing movement of conveyor 13.
  • a stop shoulder 18 is provided in a position aligned with the path portion P1 to stop packages 3.
  • the stop shoulder 18 is preferably arranged in a fixed position next to circuit C, on the opposite lateral side with respect to conveyor 13.
  • housings 16 are open on both sides, i.e. towards conveyor 13 and towards the stop shoulder 18. Thereby, each package 3 can enter into its compartment 16 on one side and exit from the opposite side.
  • each compartment 16 has its stop shoulder 18, on the side opposite to that of conveyor 13.
  • compartments 16 have respective lower bases 19, respective front appendixes 20 and respective back walls 21, and are hung on two chains or belts 22a and 22b so that bases 19 remain horizontal also along the path portion P4 and thus packages 3 are not rotated, i.e. they always travel parallel to themselves.
  • Chains 22a and 22b are arranged on opposite lateral sides of compartments 16, are parallel to circuit C, and are wound on an upper wheel 23a and 23b, respectively ( figure 1 ) and on a lower wheel 24a and 24b, respectively.
  • Wheels 23a, 23b, 24a, 24b have the same diameter and are coupled with frame 9 so as to rotate about fixed horizontal axes, which lie on the same ideal vertical plane.
  • wheels 23a and 24a have the same distance between centers as wheels 23b and 24b, but they are arranged at different heights with respect to those of wheels 23b and 24b.
  • base 19 is supported by two pins 25a and 25b, which hinge compartment 16 to chains 22a and 22b, respectively, about respective axes 26a and 26b, which are horizontal, lie on the same ideal vertical plane and are vertically spaced by an amount equal to the height deviation between the axes of wheels 23a, 23b and between the axes of wheels 24a, 24b.
  • pins 25a and 25b allows to avoid additional guides against the onset of oscillations along the curves of circuit C.
  • the rotational motion is advantageously transmitted by wheel 24a to wheel 24b by means of a homokinetic joint 29, for example a dual Cardan joint.
  • machine 1 comprises a fixed ejection cam 30, which enters in a slit 33 made at a lateral end of bases 19, when the compartments 16 descend along the path portion P5.
  • the ejection cam 30 defines an inclined plane 34, with downward slope towards conveyor 14 and outlet 11: therefore, the ejection cam 30 rests against an end of each package 3 and then, due to the inclined plane 34 and to the descent of compartments 16, it axially pushes packages 3 towards outlet 11.
  • machine 1 comprises two baffles 35, which are supported by frame 9, are arranged on opposite sides of the path portion P3, close to the zone in which conveyor 15 is loaded with packages 3, and have such a shape and positions as to fold flaps 2 in a direction opposite to that in which packages 3 are vertically transferred.
  • flaps 2 encounter baffles 35 and are elastically deformed downwards about respective horizontal folding lines 36, orthogonal to axes 5, while the base 19 of each compartment 16 opposes the downwards force exerted by baffles 35 on package 3.
  • Machine 1 further comprises two heating devices 38, which are alike, are arranged on the sides of the path portion P3, respectively, and heat the folding lines 36 to such a temperature as to soften the plastic material without damaging the packaged products and without altering the heat-seal or melting the plastic material.
  • the maximum allowable temperature is 160 °C for 4 seconds.
  • Devices 38 comprise respective bands 39 wound on rollers 40 rotating about horizontal axes, which are orthogonal to the axes of the wheels of conveyor 15, i.e. parallel to the folding lines 36.
  • the bands 39 travel on a vertical branch 42, arranged immediately after the respective baffles 35 following the advancing direction of compartments 16: along the vertical branch 42, bands 39 define a vertical surface 43, which is orthogonal to axes 5 and parallel to the folding lines 36, and rests against flaps 2 to keep them folded, and is vertically movable in the same direction as compartments 16.
  • Bands 39 are synchronized with chains 22a, 22b, thus the vertical surface 43 does not slither on flaps 2 and it even pulls packages 3 along with conveyor 15.
  • devices 38 comprise respective heaters 44, for example of the type with electrical resistances, adjacent to bands 39 along the vertical branches 42, thus bands 39 transmit the heat to the ends of packages 3.
  • Devices 38 comprise respective carriages 45, which support rollers 40 and heaters 44 and are coupled with horizontal guides 46 fixed to frame 9, so as to move under the action of respective actuators 47 ( figure 3 ).
  • Actuators 47 are controlled for moving devices 38 from a working position to a stand-by position (not shown) and thus move bands 39 away from the ends of packages 3 in case of halt of the transfer system 12, in order to prevent the packaged products from excessively heating.
  • each device 38 preferably comprises two parallel bands 39 and two heaters 44, so as to define an intermediate vertical slit 49 engaged by a shoulder which is defined, in particular, by a foil 50 extending over the whole vertical branch 42.
  • Foil 50 is fixed and is recessed into slit 49 with respect to the vertical surface 43 so as to be horizontally spaced apart from flaps 2, when carriages 45 are arranged in the working position, thus it does not slither against packages 3.
  • the foil 50 is sufficiently close to flaps 2 to prevent the latter from lifting up again if carriages 45 are stopped in the stand-by position. In other words, flaps 2 remain bent along the folding lines 36 due to the retaining of foils 50, thus they are not creased by bands 39 when the carriages 45 are then returned to the working position upon the restart of the transfer system 12.
  • each transmission unit 51 comprises a belt transmission 53 and a toothed transmission 54, in particular of the type with conical gears, arranged in series.
  • the belt transmissions 53 comprise respective belts 55 which, also due to respective tensioners 56, adapt to the movements of carriages 45 between the working and stand-by positions.
  • the transmission shaft 52 has an end driven by motor 17, in particular by means of a gear unit and a belt transmission 57 ( figure 1 ), and comprises two shafts 58a, 58b, which are coaxial to wheels 24a, 24b, are arranged on opposite lateral sides of joint 29, are angularly fixed with respect to the ends of joint 29 and drive the toothed transmissions 54, respectively.
  • machine 1 further comprises a cooling unit 60, which comprises at least two plates 61 supported by frame 9 in fixed positions, on opposite lateral sides of compartments 16 and immediately after devices 38 and foils 50.
  • a cooling unit 60 which comprises at least two plates 61 supported by frame 9 in fixed positions, on opposite lateral sides of compartments 16 and immediately after devices 38 and foils 50.
  • Plates 61 define vertical surfaces 63, which are substantially aligned with the vertical branch 42 of bands 39. Plates 61 are hollow and accommodate respective coils, or they define respective chambers, which are connected by means of connectors 65 and by means of pipes (not shown) with a source 66 which feeds a flow of a cooling fluid, in particular air.
  • Source 66 is advantageously defined by a Ranque-Hilsch tube or vortex tube, which allows the temperature to be decreased to the desired values without causing condensation on the vertical surfaces 63, and in a very simple manner.
  • FIG. 5 shows a variant of machine 1, the various components of which are indicated with the same reference numerals in figures 1-4 , where possible.
  • Baffles 35 are not shown and are replaced by or integrated with bending devices 68 which comprise respective blades 69 vertically arranged between devices 38 and the zone in which conveyor 15 is loaded with packages 3.
  • Blades 69 are driven with an alternating movement which is synchronized with bands 39 and/or chains 22a, 22b and has a forward stroke concurrent with the movement of packages 3 along the path portion P3. With such a forward stroke, a horizontal edge 70 of blades 69 rests on and presses against packages 3, at the zones where the folding lines 36 must be formed, substantially when flaps 2 encounter baffles 35 (or bands 39, if baffles 35 are not provided) so as to form the folding lines 36. In this position (not shown), blades 69 are substantially vertical.
  • Blades 69 are rotatable about respective horizontal axes 71 so as to travel arched trajectories. At the end of their return stroke, blades 69 are retracted, i.e. they are spaced apart from the path portion P3, so as to allow packages 3 to freely move towards baffles 35 and/or bands 39.
  • devices 68 In order to rotate blades 69, devices 68 preferably comprise respective cams 72, which are coaxial and fixed with respect to two of rollers 40. Devices 68 further comprise respective lever transmissions 73, each having a tappet element 74 at one end, held resting against cam 72 by means of a spring 75. At the opposite end, transmissions 73 are hinged to respective arms 76, about axes 77 arranged in eccentric position with respect to axes 71, while arms 76 are fixed with respect to blades 69.
  • blades 69 insert beneath flaps 2, press against each package 3 and while flaps 2 engage with baffles 35 or bands 39 during the vertical movement of packages 2, they bend flaps 2 themselves. Therefore, blades 69 precisely mark and form the folding lines 36.
  • flaps 2 are not prone to undesired creasing or folding, since packages 3 are transferred along the path portion P3 in a direction opposite to that in which flaps 2 are bent by baffles 35, and the folding lines 36 are orthogonal to bands 39 along the vertical branch 42.
  • Devices 68 contribute to preventing creases, since edges 70 precisely define the zone in which flaps 2 must be bent.
  • the cooling suddenly stiffens the plastic material of packages 3 along the folding lines 36 after the previous softening caused by the heating, thus it effectively stabilizes the folding shape and therefore makes the vertical position of flaps 2 long-lasting.
  • inlet 10 and outlet 11 may be obtained on the same side of machine 1 and/or outlet 11 and conveyor 14 may be arranged at a height different from that of inlet 10 and of conveyor 13, with considerable advantages and flexibility in the layout design of the packaging line in the plant.
  • the cooling may be carried out in a manner other than that indicated, for example by means of a cooling fluid directed towards the folding lines 36, and/or it may be carried out along the path portions P4, P5 for reducing the height of machine 1; and/or the cooling fluid may be formed by a source other than the vortex tube.
  • Loading and unloading packages 3 with respect to conveyor 15 may occur in a different manner and/or in directions other than those indicated by way of example; and/or conveyors 13 and 14 may not be rectilinear; and/or circuit C may have an annular shape other than that shown; and/or contrivances other than the offset of chains 22a, 22b and of the hinge axes 26a, 26b may be provided for preventing compartments 16 from oscillating.
  • the devices 38 and/or the wheels of conveyor 15 may be driven by additional motors synchronized with motor 17, rather than including the transmission shaft 52; and/or devices 38 may be different from those shown, for example for also integrating the step of bending flaps 2, without including separate baffles 35.
  • the cooling of the folding lines 3 upon heating and/or removing the devices 38 from the working position may also be applied to flap folding machines in which packages 3 are transferred in a direction other than the vertical direction.
  • the particular system of supporting and pulling compartments 16, with lateral chains or belts offset in height may also be used in different conveyors or machines, designing the compartments 16 so as to support the desired number and type of products and designing the profile of circuit C according to the needs.
  • a system may be applied in variable-capacity warehouses where the compartments are defined by support elements, called “suspended trays” or “nacelle”, capable of supporting ranks of products.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
EP13162631.9A 2012-04-30 2013-04-05 Procédé et machine pour le pliage de rabats thermosoudés au niveau des extrémités d'emballages Withdrawn EP2660159A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000385A ITTO20120385A1 (it) 2012-04-30 2012-04-30 Metodo e macchina per piegare alette termosaldate alle estremita' di confezioni

Publications (1)

Publication Number Publication Date
EP2660159A1 true EP2660159A1 (fr) 2013-11-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13162631.9A Withdrawn EP2660159A1 (fr) 2012-04-30 2013-04-05 Procédé et machine pour le pliage de rabats thermosoudés au niveau des extrémités d'emballages

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EP (1) EP2660159A1 (fr)
IT (1) ITTO20120385A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2746170B1 (fr) * 2012-12-21 2016-04-27 Tetra Laval Holdings & Finance S.A. Unité de conditionnement pour machines de conditionnement de produits alimentaires pouvant être versés

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB615594A (en) * 1946-08-29 1949-01-07 Valentine Pearce Harvey An improved method of and apparatus for sealing wrappers
US4034537A (en) * 1973-07-26 1977-07-12 Altstadter Verpackungs-Vertriebs Gmbh Method and apparatus for the continuous manufacture of packages for liquids
EP0268151A1 (fr) 1986-11-12 1988-05-25 Focke & Co. (GmbH & Co.) Procédé et dispositif de scellage des rabats de pliage d'un emballage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB615594A (en) * 1946-08-29 1949-01-07 Valentine Pearce Harvey An improved method of and apparatus for sealing wrappers
US4034537A (en) * 1973-07-26 1977-07-12 Altstadter Verpackungs-Vertriebs Gmbh Method and apparatus for the continuous manufacture of packages for liquids
EP0268151A1 (fr) 1986-11-12 1988-05-25 Focke & Co. (GmbH & Co.) Procédé et dispositif de scellage des rabats de pliage d'un emballage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2746170B1 (fr) * 2012-12-21 2016-04-27 Tetra Laval Holdings & Finance S.A. Unité de conditionnement pour machines de conditionnement de produits alimentaires pouvant être versés
US10086966B2 (en) 2012-12-21 2018-10-02 Tetra Laval Holdings & Finance S.A. Folding unit for pourable food product packaging machines

Also Published As

Publication number Publication date
ITTO20120385A1 (it) 2013-10-31

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