EP3566960A1 - Unité de pliage pour un ensemble de conditionnement et ensemble de conditionnement comprenant une unité de pliage - Google Patents

Unité de pliage pour un ensemble de conditionnement et ensemble de conditionnement comprenant une unité de pliage Download PDF

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Publication number
EP3566960A1
EP3566960A1 EP18171763.8A EP18171763A EP3566960A1 EP 3566960 A1 EP3566960 A1 EP 3566960A1 EP 18171763 A EP18171763 A EP 18171763A EP 3566960 A1 EP3566960 A1 EP 3566960A1
Authority
EP
European Patent Office
Prior art keywords
folding
moving member
branch
folding unit
path
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Withdrawn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
EP18171763.8A
Other languages
German (de)
English (en)
Inventor
Giorgio Mattioli
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.)
Tetra Laval Holdings and Finance SA
Original Assignee
Tetra Laval Holdings and Finance SA
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 Tetra Laval Holdings and Finance SA filed Critical Tetra Laval Holdings and Finance SA
Priority to EP18171763.8A priority Critical patent/EP3566960A1/fr
Publication of EP3566960A1 publication Critical patent/EP3566960A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • B65B1/00—Packaging fluent solid material, e.g. powders, granular or loose fibrous material, loose masses of small articles, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
    • 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
    • B65B7/00—Closing containers or receptacles after filling
    • B65B7/16—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons
    • B65B7/20—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by folding-down preformed flaps

Definitions

  • the present invention relates to a folding unit for a packaging assembly configured to form, seal and fold a plurality of packages containing a pourable product, in particular a pourable food product.
  • the present invention also relates to a packaging assembly configured to form, seal and fold a plurality of packages containing a pourable product, in particular a pourable food product, and comprising a folding unit.
  • pourable food products such as fruit juice, UHT (ultra-high temperature-treated) milk, wine, tomato sauce, etc.
  • UHT ultra-high temperature-treated milk
  • wine tomato sauce
  • etc. are sold in packages made of sterilized packaging material.
  • a typical example is the parallelepiped-shaped package for pourable food products known as Tetra Brik Aseptic (registered trademark), which is made by folding and sealing a laminated web of packaging material.
  • the packaging material has a multilayer structure, known and not described in detail.
  • the packages are normally produced on fully automatic packaging assemblies, in which a continuous tube is formed from the web of packaging material.
  • the known packaging assemblies comprise a forming unit, a folding unit and an outfeed device.
  • the web of packaging material is folded and sealed longitudinally to form the tube, and then the tube is fed to the forming unit along a vertical direction.
  • the tube is filled from above, by means of a pipe, with the pourable food product and is formed, sealed and subsequently cut along equally spaced transversal cross sections.
  • Pillow packs are obtained thereby, which have a longitudinal sealing band, a top transversal sealing band and a bottom transversal sealing band.
  • each pillow pack usually comprises a prismatic main portion, which has a longitudinal axis, a top end portion and a bottom end portion opposite to one another.
  • the top end portion and the bottom end portion define respective transitions from the main portion towards the top sealing band and the bottom sealing band, respectively.
  • Each pillow pack further comprises an elongated rectangular top end fin, arranged at the top end portion, and an elongated rectangular bottom end fin, arranged at the bottom end portion.
  • the top end fin and the bottom end fin protrude orthogonally from the respective top end portion or bottom end portion.
  • Each pillow pack also comprises two pairs of substantially triangular flaps projecting from opposite sides of the respective top end portion or bottom end portion.
  • the pillow packs After being formed, sealed and cut, the pillow packs are typically fed to the folding unit, which is configured to perform a final folding operation on the pillow packs, so as to obtain respective finished packages.
  • the folding unit comprises an endless conveyor configured to advance the pillow packs (and then the folded packages) along an endless folding path defined by the endless conveyor.
  • the folding path comprises an input station, at which the folding unit receives a plurality of formed and sealed semi-finished pillow packs from the forming unit, and an output station, at which the fully-folded and finished packages are fed to the outfeed device.
  • the folding path generally comprises a top straight branch, a bottom straight branch and two curved branches, which are opposite to one another and connect, on respective opposite sides, the top straight branch and the bottom straight branch.
  • the input station is arranged at the curved branch adjacent to the forming unit, hereafter first curved branch
  • the output station is arranged at the bottom straight branch, downstream of the curved branch opposite to the first curved branch, hereafter second curved branch.
  • the folding units of the known type further comprise a plurality of folding devices movably coupled to the endless conveyor so as to cyclically move, in use, along the folding path.
  • each folding device is configured to receive one pillow pack at a time at the input station, to carry such pillow pack along the folding path and to interact with such pillow pack to perform a relative folding operation thereon, thereby obtaining a respective finished package.
  • a folding device adapted to be implemented in the above-mentioned folding unit is known from EP-B-2586716 , and substantially comprises:
  • the plate is adapted to cooperate in contact with the top end portion of the pillow pack.
  • the pillow pack is carried along the first curved branch and the subsequent top straight branch of the folding path in an upside-down position, while being transformed into a folded finished package. Then, the package is turned by 180° along the second curved branch, so that the package is fed to the outfeed device, along the bottom straight branch, in an upright position.
  • the plate comprises a through slot, which is designed to be engaged by the top end fin of the pillow pack.
  • the top end fin is folded onto the top end wall of the package by a shaped plate located underneath the plate and movable, in a direction parallel to the folding path, between a first position, in which the shaped plate engages the slot, so as to fold the top end fin housed therein, and a second position, in which the shaped plate leaves free the slot.
  • the shaped plate carries two wedges designed to engage the slot and to cooperate with the top end fin when the shaped plate is in the first position, thereby pushing forward and folding the top end fin onto the top end wall of the package.
  • the shaped plate further comprises a pair of racks arranged upstream of the wedges, with respect to the advancing direction of the folding device along the folding path, the racks being arranged to drive the shaped plate.
  • the folding device also comprises a pair of toothed sectors, which protrude from the folding device downstream of the plate, with respect to the advancing direction of the folding device along the folding path.
  • the toothed sectors of one folding device are configured to mesh with the racks of the shaped plate of the following folding device on the conveyor.
  • Such following folding device defines, together with the preceding folding device, a pair of cooperating folding devices.
  • the two folding devices move towards each other.
  • the racks of the following folding device are moved forward by the toothed sectors of the preceding folding device, due to the curvature of the folding path. Accordingly, the shaped plate moves from the second position to the first position, and the folding of the top end fin by means of the wedges occurs.
  • the meshing between the racks of the following folding device and the toothed sectors of the preceding folding device causes a relative movement of these two folding devices not only along the first curved branch of the folding path, but also along the second curved branch of the folding path.
  • This relative movement occurring upstream of the output station may cause mispositioning of the packages, which could compromise the discharge of such packages to the outfeed device and lead to package jamming.
  • number 1 indicates as a whole a folding unit for a packaging assembly (known per se and not shown) configured to form, seal and fold a plurality of pillow packs 3 containing a pourable product, in particular a pourable food product such as fruit juice, milk, wine, tomato sauce, etc.
  • a packaging assembly known per se and not shown
  • a pourable product such as fruit juice, milk, wine, tomato sauce, etc.
  • pillow packs 3 may be obtained from a tube, which is formed in a known manner upstream of folding unit 1 by longitudinally folding and sealing a web (not shown) of packaging material.
  • the tube After being formed, the tube is filled with the pourable food product and is fed to a forming unit (not shown) of the packaging assembly.
  • the tube In the forming unit, the tube is sealed and cut along equally spaced cross-sections to form the plurality of semi-finished pillow packs 3, which have a longitudinal sealing band, a top transversal sealing band and bottom transversal sealing band.
  • each pillow pack 3 comprises a prismatic main portion 4, having a longitudinal axis A and being defined by four lateral walls 4a (only two visible in Figure 7 ) and two shaped walls 4b (only one visible in Figure 7 ) interposed between two adjacent lateral walls 4a.
  • Each pillow pack 3 further comprises a top end portion 5 and a bottom end portion 6, axially opposite to one another.
  • top end portion 5 and bottom end portion 6 define respective transitions from main portion 4 towards the top sealing band and the bottom sealing band.
  • Each pillow pack 3 also comprises an elongated rectangular bottom end fin 7, protruding from bottom end portion 6, and an elongated rectangular top end fin 8, protruding from top end portion 5.
  • top end fin 8 and bottom end fin 7 protrude axially from the respective top end portion 5 or bottom end portion 6, and define the top sealing band and the bottom sealing band of pillow pack 3, respectively.
  • top end fin 8 and bottom end fin 7 extend along a direction orthogonal to axis A.
  • each pillow pack 3 comprises two pairs of substantially triangular flaps 9, which project from opposite sides of top end portion 5 and bottom end portion 6, respectively.
  • pillow packs 3 After being formed, sealed and cut, pillow packs 3 are fed to folding unit 1, which is configured to perform a final folding operation on pillow packs 3, so as to obtain respective fully-folded finished packages 2.
  • folding unit 1 comprises an endless conveyor 10 configured to advance semi-finished pillow packs 3 and finished packages 2 along an endless folding path P defined by endless conveyor 10.
  • folding path P comprises an input station I, at which folding unit 1 receives the plurality of pillow packs 3 from the forming unit, and an output station 0, at which the fully-folded and finished packages 2 are fed to an outfeed device (not shown) and subsequently exit the packaging assembly.
  • folding path P has a substantially oval-shaped profile and comprises a first curved branch P1, a top straight branch P2, a second curved branch P3 and a bottom straight branch P4.
  • first curved branch P1 and second curved branch P3 are opposite to one another and connect, on respective opposite sides, top straight branch P2 and bottom straight branch P4.
  • top straight branch P2 extends from first curved branch P1; second curved branch P3 extends from top straight branch P2; and bottom straight branch P4 extends from second curved branch P3 and is connected to first curved branch P1.
  • input station I is arranged at first curved branch P1, i.e. the one adjacent to the forming unit, and output station 0 is arranged at bottom straight branch P4, i.e. the one adjacent to outfeed device.
  • pillow packs 3 and packages 2 are advanced, from input station I, first along curved branch P1, then along top straight branch P2, subsequently along second curved branch P3 and eventually along bottom straight branch P4, along which packages 2 reach output station 0.
  • pillow packs 3 and packages 2 are advanced from input station I to output station 0 with their respective axes A orthogonal to folding path P.
  • folding unit 1 further comprises a plurality of folding devices 11 (only five shown in Figure 1 ) movably coupled to conveyor 10 so as to cyclically move along folding path P.
  • folding devices 11 form an endless transport element, in the example shown a chain 14 ( Figure 3 ), formed by a plurality of consecutive links, each one defined by a single folding device 11.
  • chain 14 is looped about a pair of driving members, preferably a pair of coaxial sprockets 15, and about a cam 16.
  • chain 14 is driven by sprockets 15, so that the consecutive folding devices 11 can be moved on conveyor 10 and along folding path P.
  • chain 14 is configured to carry pillow packs 3 and packages 2 along folding path P, from input station I to output station 0.
  • folding device 11 comprise:
  • pillow pack 3 and/or package 2 is carried by folding device 11 with top end portion 5 facing supporting element 90.
  • pillow pack 3 is carried, from input station I, along first curved branch P1 and the subsequent top straight branch P2 of folding path P, in an upside-down position.
  • first curved branch P1 and top straight branch P2 such pillow pack 3 is transformed into a package 2.
  • package 2 is turned by 180° along second curved branch P3, and eventually is fed to the outfeed device at output station 0 in an upright position.
  • folding device 11 After package 2 exits from folding unit 1, folding device 11 advances along bottom straight branch P4 until it reaches again first curved branch P1 and input station I.
  • paddle 18 mirrors the shape of lateral wall 4a it cooperates in contact with.
  • shells 19 define respective surfaces 21, which are adapted to cooperate in contact with lateral walls 4a and shaped walls 4b of pillow pack 3.
  • surfaces 21 face one another and mirror lateral walls 4a of main portion 4, so as to control the final shape of pillow pack 3 to be folded.
  • surfaces 21 are configured to cooperate with triangular flaps 9 of top portion 5 so as to fold them onto corresponding lateral walls 4a of main portion 4.
  • top end portion 5 and bottom end portion 6 are pressed towards each other, so as to form a top face and a bottom face of package 2 being obtained from pillow pack 3.
  • each shell 19 is connected to conveyor 10 of folding unit 1 by means of a relative arm 22 extending transversally, preferably orthogonally, to folding path P.
  • arms 22 define corresponding slides 23 configured to engage respective guides 24 integrally carried by folding device 11 on opposite sides of paddle 18.
  • each arm 22 carries, on its end opposite to relative shell 19, a roller 25 configured to engage a relative endless cam 26 ( Figures 1 and 2 ).
  • folding unit 1 comprises two cams 26 arranged at opposite lateral sides of conveyor 10 and extending along a direction parallel to part of folding path P.
  • cams 26 are configured to control, together with rollers 25, a movement of arms 22 transversal to folding path P and, hence, the movement of shells 19 towards each other and transversal to folding path P between:
  • shells 19 are arranged in the open position at input station I and move from the open position towards the fully closed position when folding device 11 is advancing along the top straight branch P2 of folding path P.
  • shells 19 move back towards the open position when folding device 11 is advancing along the bottom straight branch P4 of folding path P.
  • shells 19 may be also arranged in a closed position, in which shells 19 grip package 2 without exerting any pressure thereon.
  • each shell 19 moves between the fully closed position and the open position when the respective roller 25 engages corresponding operative portions of cam 26, converging towards or diverging from folding path P.
  • bottom end fin 7 is folded onto bottom face of package 2 being obtained from pillow pack 3.
  • folding unit 1 comprises folding means configured to displace top end fin 8 of pillow pack 3 from an unfolded configuration, in which top end fin 8 projects from top end portion 5, to a folded configuration, in which top end fin 8 rests on top face of package 2 being obtained from pillow pack 3.
  • Folding means comprise a moving member, preferably a flat plate 17 movably carried by folding device 11.
  • plate 17 is configured to move, preferably slide, between:
  • top end fin 8 occurs when plate 17 is moving from the first position towards the second position.
  • plate 17 is detached from top end fin 8 when being in the first position.
  • plate 17 is configured to move from the first position towards the second position while advancing along folding path P from input station I to output station 0.
  • plate 17 is configured to move back from the second position towards the first position while advancing along the folding path P from output station 0 to input station I.
  • the folding means further comprise at least one guiding track 28 having:
  • Folding means further comprise at least one engaging element, preferably a roller 29, which is configured to engage track 28, is carried by plate 17, and is adapted to move away from folding path when engaging operative portion 28b, to move towards folding path P when engaging operative portion 28c, and to advance parallel to folding path P when engaging main portion 28a.
  • at least one engaging element preferably a roller 29, which is configured to engage track 28, is carried by plate 17, and is adapted to move away from folding path when engaging operative portion 28b, to move towards folding path P when engaging operative portion 28c, and to advance parallel to folding path P when engaging main portion 28a.
  • roller 29 towards or away from folding path P causes the movement of plate 17 between the first position and the second position.
  • plate 17 is configured to move from the first position to the second position when roller 29 engages operative portion 28b.
  • plate 17 is configured to move from the second position to the first position when roller 29 engages operative portion 28c.
  • plate 17 is configured to stay in the first position or in the second position when roller 29 engages main portion 28a.
  • operative portion 28b is arranged along first curved branch P1 and/or along a first portion of top straight branch P2 and downstream of input station I, and operative portion 28c is arranged along bottom straight branch P4 and downstream of output station 0.
  • plate 17 is configured to selectively move back and forth parallel to folding path P, when moving between the first position and the second position.
  • the first position is a retracted position for plate 17 with respect to the direction of advancement of pillow pack 3 and/or package 2 along folding path P
  • the second position is an advanced position for plate 17 with respect to the direction of advancement of pillow pack 3 and/or package 2 along folding path P.
  • plate 17 when plate 17 is in the first position, it is partly retracted underneath paddle 18.
  • pillow pack 3 is carried by folding device 11 so that top end fin 8 is arranged between plate 17 and stop element 27.
  • plate 17 moves forward parallel to folding path P, it cooperates in contact with top end fin 8 and folds top end fin 8.
  • stop element 27 the movement from the first position towards the second position is completed.
  • roller 29 is carried by (coupled to) plate 17 by means of a lever mechanism 30.
  • lever mechanism 30 is configured to transform the movement of roller 29 towards and away from folding path P in the back and forth movement of plate 17 between the first position and the second position.
  • lever mechanism 30 comprises a first lever member 35, which is coupled to plate 17 by means of a pin 37, and a linear rod 31, which extends along an axis B, which is transversal to folding path P and eccentric with respect to pin 37.
  • pin 37 is received in a seat of a block element integral with plate 17. More in particular, the block element is located underneath plate 17.
  • linear rod 31 carries, in turn, roller 29, eccentrically with respect to axis B, by means of a second lever member 34.
  • lever member 34 and lever member 35 extend transversally, preferably orthogonally, to axis B and, hence, protrude transversally, preferably orthogonally, from linear rod 31.
  • linear rod 31 carries, at a first end portion 32 adjacent to plate 17, lever member 35 and, at a second end portion 33 adjacent to roller 29, lever member 34.
  • lever member 34 is coupled to second end portion 33 of linear rod 31 at one end, transversally with respect to axis B, and carries roller 29 at another opposite end.
  • roller 29 Since roller 29 is carried by linear rod 31 eccentrically with respect to axis B, the movement of roller 29 (towards and away from folding path P) causes a rotation of linear rod 31, by means of lever member 34. Such rotation of linear rod 31 causes, by means of lever member 35, a movement of pin 37 back and forth and, therefore, the movement of plate 17 between the first position and the second position.
  • plate 17 comprises a pair of slides 36 ( Figure 6 ) extending parallel to folding path P and configured to engage a pair of not shown corresponding guides so as to guide the movement of plate 17 back and forth between the first position and the second position.
  • folding unit 1 The operation of folding unit 1 is described hereinafter with reference to a single folding device 11 advancing on conveyor 10 and starting from a condition in which folding device 11 is advancing along first curved branch P1 and is receiving one respective pillow pack 3 at input station I.
  • supporting element 90 receives and supports one pillow pack 3 and paddle 18 pushes lateral wall 4a of pillow pack 3 along folding path P.
  • shells 19 are in the open position and roller 29 starts to engage operative portion 28b of track 28, which is arranged at first curved branch P1 and/or along a first portion of top straight branch P2 downstream of input station I, as mentioned above.
  • roller 29 is moved away from folding path P and plate 17 moves, by means of lever mechanism 30, from the first position towards the second position.
  • plate 17 cooperates with top end fin 8, which is arranged between plate 17 and stop element 27, and folds top end fin 8 on top face of package 2 being obtained from pillow pack 3.
  • folding device 11 advances along top straight branch P2 of folding path P and shells 19 move, due to the interaction between rollers 25 and cams 26, from the open position towards the fully closed position ( Figure 1 ), thereby completing the folding operation of pillow pack 3 and obtaining one package 2.
  • folding device 11 advances along second curved branch P3, thereby turning package 2 by 180°, from an upside-down position to an upright position.
  • folding device 11 leaves second curved branch P3 and enters bottom straight branch P4, it reaches output station 0, where package 2 is fed to the outfeed device.
  • folding device 11 advances along the remaining portion of bottom straight branch P4, where roller 29 engages operative portion 28c and plate 17 moves, accordingly, back to the first position.
  • folding unit 1 according to the present invention will be clear from the foregoing description.
  • each package 2 is fed to the outfeed device in the nominal position and any production jamming is avoided.
  • each folding device 11 which may be present in folding unit 1 are controlled independently from one another by means of the interaction between track 28 and roller 29, there is no mutual interaction between folding devices 11. More precisely, there is no mutual interaction between one folding device 11 and the following or the preceding folding device 11.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
EP18171763.8A 2018-05-11 2018-05-11 Unité de pliage pour un ensemble de conditionnement et ensemble de conditionnement comprenant une unité de pliage Withdrawn EP3566960A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18171763.8A EP3566960A1 (fr) 2018-05-11 2018-05-11 Unité de pliage pour un ensemble de conditionnement et ensemble de conditionnement comprenant une unité de pliage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18171763.8A EP3566960A1 (fr) 2018-05-11 2018-05-11 Unité de pliage pour un ensemble de conditionnement et ensemble de conditionnement comprenant une unité de pliage

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EP3566960A1 true EP3566960A1 (fr) 2019-11-13

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EP18171763.8A Withdrawn EP3566960A1 (fr) 2018-05-11 2018-05-11 Unité de pliage pour un ensemble de conditionnement et ensemble de conditionnement comprenant une unité de pliage

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2586716A1 (fr) * 2011-10-31 2013-05-01 Tetra Laval Holdings & Finance S.A. Unité de conditionnement pour machines de conditionnement de produits alimentaires pouvant être versés
EP3020642A1 (fr) * 2014-11-11 2016-05-18 Tetra Laval Holdings & Finance S.A. Unité de pliage pour produire des emballages pliés à partir de paquets scellés

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2586716A1 (fr) * 2011-10-31 2013-05-01 Tetra Laval Holdings & Finance S.A. Unité de conditionnement pour machines de conditionnement de produits alimentaires pouvant être versés
EP2586716B1 (fr) 2011-10-31 2014-08-06 Tetra Laval Holdings & Finance S.A. Unité de conditionnement pour machines de conditionnement de produits alimentaires pouvant être versés
EP3020642A1 (fr) * 2014-11-11 2016-05-18 Tetra Laval Holdings & Finance S.A. Unité de pliage pour produire des emballages pliés à partir de paquets scellés

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