EP2452882A1 - Machine et procédé pour l'emballage des produits - Google Patents

Machine et procédé pour l'emballage des produits Download PDF

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Publication number
EP2452882A1
EP2452882A1 EP11188594A EP11188594A EP2452882A1 EP 2452882 A1 EP2452882 A1 EP 2452882A1 EP 11188594 A EP11188594 A EP 11188594A EP 11188594 A EP11188594 A EP 11188594A EP 2452882 A1 EP2452882 A1 EP 2452882A1
Authority
EP
European Patent Office
Prior art keywords
products
film
group
movement
containing casing
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Withdrawn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
EP11188594A
Other languages
German (de)
English (en)
Inventor
Mauro Cere'
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.)
Aetna Group SpA
Original Assignee
Aetna Group 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 Aetna Group SpA filed Critical Aetna Group SpA
Publication of EP2452882A1 publication Critical patent/EP2452882A1/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Withdrawn legal-status Critical Current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
    • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
    • B65B11/02—Wrapping articles or quantities of material, without changing their position during the wrapping operation, e.g. in moulds with hinged folders
    • B65B11/025—Wrapping articles or quantities of material, without changing their position during the wrapping operation, e.g. in moulds with hinged folders by webs revolving around stationary articles
    • 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
    • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
    • B65B11/58—Applying two or more wrappers, e.g. in succession
    • B65B11/585—Applying two or more wrappers, e.g. in succession to stacked articles, e.g. pallettised loads

Definitions

  • the invention relates to machines and methods for wrapping products with a stretch film of plastic material.
  • the invention relates to a machine and a method for wrapping a film around a group of products with an irregular shape and/or which is unstable and/or which is difficult to stack, which products being grouped on flatbeds or pallets.
  • Wrapping machines comprising a frame provided with two or more vertical columns suitable for slidably supporting a load-bearing structure, or carriage, that in turn rotatably supports a horizontal rotating ring.
  • This horizontal rotating ring supports a reel of stretch plastic film and a corresponding unwinding unit arranged for unwinding and stretching, or elongating, the aforesaid plastic film.
  • the unwinding unit is generally provided with a pair of prestretching rollers comprising a slow roller and a fast roller, respectively upstream and downstream of the film motion, to stretch and unwind the stretch film and one or more deviating rollers for deviating the film during unwinding.
  • the load-bearing structure which is movable along a vertical axis, supports the ring, which is rotated around said vertical axis.
  • the reel of film and the unwinding unit are rotated around the group of products arranged on pallets and moved in a vertical direction, optionally with reciprocating movement, such as to wrap said group of products with a series of plaited bands or strips of film over the entire height thereof.
  • Some machines are further set up to lay onto the group of products a covering sheet onto which the stretch plastic film is subsequently wrapped.
  • the covering sheet which is also made of a plastic material, separates and insulates more effectively the group of products from the external environment.
  • These machines include a horizontal conveying plane that extends through the frame and enables the group of products to be positioned at the horizontal ring.
  • the prestretching rollers enable the plastic film to be stretched and elongated by a set percentage before the latter is wound on the products, both to use the available film as well as possible and to change the mechanical features of the film material according to the products to be wrapped.
  • the suitably stretched plastic material can in fact pass from an elastic behaviour, in which the film tends to recover the original dimension when the stress stops, to a plastic behaviour in which the film undergoes a permanent deformation and does not recover the initial dimensions when the stress stops.
  • the film of plastic material behaves as a flexible and inextensible element, the same as a rope or a belt.
  • the aforesaid wrapping machines can wrap groups of products that assume a stable composition or arrangement on the pallet, i.e. products that are stackable and superimposable.
  • An object of the present invention is to improve the machines and the known methods for wrapping groups of products with a stretch plastic film.
  • Another object is to devise a machine and a method that enable groups of products to be wrapped with a stretch plastic film and possibly with a covering sheet, automatically without manual intervention of operators, the groups of products having shapes, dimensions and consistency that are such that they are difficult to stack and/or group securely and stably on flatbeds or pallets.
  • a further object is to devise a machine and a method that enable adhering and stable wrappings to be achieved on said groups of instable products, operating at high speeds, such as to increase productivity compared with known machines and methods.
  • a machine for wrapping a plurality of products with a stretch plastic film according to claim 1.
  • the structure of the machine which enables the containing casing to be moved along a movement direction parallel to the axis of wrapping of the film around the group of products, is particularly compact and functional.
  • the machine enables the empty containing casing to be moved and managed, making the empty containing casing available for subsequent use.
  • the wrapping machine 1 of the invention arranged for wrapping with a film 50 of stretch plastic material a plurality or group of products 100 arranged on a pallet 101 and housed inside a containing casing 200.
  • the products 100 are products (objects, manufactured products, articles, etc) having an irregular and/or variable shape and/or dimensions and/or having little consistency or compactness, i.e. products that for being stacked or superimposed in a stable manner onto a pallet 101 require an external supporting and stabilising containing casing 200.
  • the containing casing 200 comprises a pair of longitudinal walls 201 connected at opposite ends by a pair of transverse walls 202, in such a manner as to form a quadrangular structure that is open above and below to stack the products 100 onto a pallet 101, in a step of composing the group of products 100, and to extract the aforesaid containing casing 200 from the group of products 100, during a step of wrapping with the film, as explained in greater detail further on in the description.
  • the longitudinal walls 201 and transverse walls 202 of the casing are made, for example, of sheet metal with reinforcing ribs and tubular sections.
  • the longitudinal walls 201 are substantially parallel to a substantially horizontal advancement direction B, along which the groups of products 100, housed in the respective containing casings 200 are moved inside the machines 1 and along which the groups of products 100 wrapped in the film and the empty containing casings 200 are moved outside of the wrapping machine 1 ( Figure 2 ).
  • the wrapping machine 1 comprises carriage means 3 that is movable linearly along a movement direction A, for example a direction that is vertical and orthogonal to the advancement direction B, slidably supported by frame means 2 and rotatably supporting ring means 4, comprising a horizontal ring rotating with respect to a wrapping axis Z of the film 50 around the group of products 100.
  • the wrapping axis Z is, for example, vertical and parallel to the movement direction A.
  • a reel of film 50 and an unwinding unit 5 are rotatably fixed comprising, for example, a pair of prestretching rollers 6, one or more deviating or idler rollers, and possibly a roller, a so-called dancing roller, for controlling the unwinding and/or tensioning of the film.
  • a gripping, cutting and welding unit 7 is also fixed that is arranged for grasping the film 50 at the end of wrapping and cutting the film 50 in such a manner as to retain a first end connected to the reel and weld a second end to the film already wound on the group of products.
  • the wrapping machine 1 further comprises a movement unit 10 slidably supported by the carriage means 3 in such a manner as to be linearly movable along the movement direction A to raise and disengage the containing casing 200 from the group of products 100 and enable simultaneous wrapping thereof with said film 50, according to the operating procedure disclosed in greater detail below in the description.
  • the carriage means 3 substantially comprises a rectangular-shaped supporting structure, slidingly fixed to two vertical columns 9 of the frame means 2 and driven along the movement direction A by movement means that is known and is not illustrated in the figures.
  • the carriage means 3 enables the rotating ring 4 to be moved, and thus the reel of film and the unwinding unit 5 to be moved between a respective minimum elevation position L1, in which the film 50 can be wound around the pallet 101 and around a lower portion of the group of products 100, and a respective maximum elevation position H1, to enable the groups of products 100 and the corresponding containing casings 200 to enter and exit the wrapping machine 1.
  • a cover unit can be fixed, which is optional and is not illustrated in the figures, which is arranged for laying over the group of products 100 a covering sheet on which the film 50 is then wrapped.
  • the machine 1 comprises further frame means 8 fixed to the carriage means 3 and arranged for slidably supporting and guiding the movement unit 10 along the movement direction A.
  • the further frame means 8 in particular comprises a portal structure provided with two parallel and spacedapart uprights 11, fixed below to the carriage means 3 and connected at opposite upper free ends by a crosspiece 12. Reinforcing tie rods 13 connect the crosspiece 12 to connecting plates 14 of the carriage means 3.
  • the movement unit 10 comprises a respective frame structure 15 with a substantially rectangular shape that is slidably connected to the uprights 11 of the further frame means 8 and is moved along the latter and along the movement direction A, by first driving means 31, 32.
  • the movement unit 10 comprises sleeves 16 for the cable sliding, provided with wheels 17, fixed to the frame structure 15 and engaged in the respective uprights 11.
  • the first driving means comprises, for example, chain means 31 driven by a first motor 32 fixed to the further frame means 8.
  • the movement unit 10 further comprises gripping means 20 arranged for engaging hooking means 203, 202 provided on the containing casing 200 in such a manner as to be able to lift the containing casing 200.
  • the gripping means 20 includes first gripping means 21 comprising two pairs of gripping arms fixed rotatably on opposite transverse sides the frame structure 15.
  • each pair of arms 21 is connected rotatably to a respective supporting beam 22 fixed to the frame structure 15 ( Figure 7 ).
  • Each gripping arm 21 is rotated around a respective axis, for example a vertical axis, between a disengaged position, in which an operating end 21a thereof, in the form of a hook, is spaced away from the longitudinal wall 201 of the containing casing 200, and an engaged position, in which said operating end 21a faces a respective first hooking means 203 provided on said longitudinal wall 201 ( Figures 10 and 11 ).
  • the gripping arm 21 is driven by a respective linear actuator 23.
  • the first hooking means 203 comprises, for example, a plate fixed to the longitudinal wall 201 and provided with a shaped seat that is suitable for being engaged by the operating end 21a when the movement unit 10 is raised, as explained better further on in the description.
  • the gripping means 20 further includes second gripping means 25 comprising a pair of locking arms fixed rotatably on opposite transverse sides of the frame structure 15.
  • each locking arm 25 is rotatably connected by brackets 26 to the frame structure 15 and to a respective sliding sleeve 16.
  • the locking arm 21 is rotated around a respective axis, for example vertical axis, between a non-operating position, in which an operating end 25a thereof is spaced away from the transverse wall 202 of the containing casing 200, and a locking position, in which said operating end 25a is inserted inside a respective second hooking means 204 provided on said transverse wall 202.
  • the locking arm 25 is driven by a respective linear actuator 27.
  • the second hooking means 204 comprises, for example, an opening made on an anchoring plate fixed to the transverse wall 202.
  • the locking arms 25 prevent possible oscillations of the containing casing 200 during movement thereof along the movement direction A.
  • the wrapping machine 1 comprises supporting and movement means 41, 42, 43 arranged for supporting and moving the groups of products 100 and the containing casings 200 along an advancement plane M.
  • the machine 1 comprises first supporting and movement means 41 that includes, for example, a first motorized roller conveyor located inside the frame means 2 below the rotating ring 4 to support the group of products 100 during wrapping.
  • the first roller conveyor 41 comprises closing means 44 arranged for acting on abutting means 205 of the containing casing 200.
  • the abutting means 205 comprises a pair of stiff flat and elongated straps or slats or flaps fixed rotatably freely to respective lower portions of the walls, for example longitudinal walls 201, of the containing casing 200.
  • the abutting means 205 allows the pallet 101 which supports the products 100 to be centred and/or supported with respect to the walls 201, 202.
  • the abutting means 205 is folded inside, in a closed position, substantially parallel to the advancement plane M of the products, defined by the rollers 47 of the first roller conveyor 41.
  • the abutting means 205 being free to rotate outwards to the open position, enables the aforesaid casing to be disengaged from the group of products 100.
  • the closing means 44 comprises a plurality of levers 45 arranged in opposite pairs and rotated around respective fulcrums by respective linear actuators 46, for example pneumatic or hydraulic cylinders, between an inactive and an active position.
  • the levers 45 are rotated and positioned inside the first roller conveyor 41 below the advancement plane M to enable a group of products to move freely.
  • the levers 45 protrude outside the first roller conveyor, in particular tilted by a set angle with respect to the advancement plane M, to abut on the abutting means 205 and rotate the abutting means 205 to the closed position.
  • the wrapping machine 1 further comprises second supporting and movement means 42 and third supporting and movement means 43 that include, for example, respectively a second motorized roller conveyor and a third motorized roller conveyor placed on opposite sides of, and adjacent to, said first roller conveyor 41.
  • the second roller conveyor 42 enables groups of products 100 inserted inside respective containing casings 200 to be supported and moved into the machine 1.
  • the third roller conveyor 43 enables groups of products 100 wrapped by the film 50 and disengaged from the respective containing casings 200 and empty containing casings 200 to be supported and moved outside the machine 1.
  • the supporting and movement means 41, 42, 43 can comprise a single motorized roller conveyor, or comprise equivalent means such as, for example, separate or integrated conveyor belts or mats.
  • the wrapping machine 1 is provided with sensor means, that is of known type and is not illustrated in the figures, that detects at least one longitudinal and/or transverse position of the group of products 100 housed in the containing casing 200.
  • the sensor means comprising, for example photocell barriers, is connected to a control unit, which is not shown, of the wrapping machine 1 such as to enable the latter to control the position of the group of products acting on the supporting and movement means 41, 42, 43.
  • the sensor means also detects the lack or incorrect positioning of the groups of product 100 and/or of containing casings 200 on the supporting and movement means 41, 42, 43.
  • Guiding means that is of known type and is not illustrated in the figures, can be associated with the supporting and movement means 41, 42, 43 to arrange the groups of products 100 in the corresponding containing casings 200 in the desired transverse position, substantially orthogonal to the movement direction A, during the longitudinal movement, along the advancement direction B, entering the wrapping machine 1.
  • the wrapping process actuated by the wrapping machine 1 of the invention disclosed above involves the following operating steps, schematically illustrated in Figures 13 to 21 .
  • a first step ( Figure 13 ) the wrapping machine 1 is ready to start the cycle: the carriage means 3 is in a respective maximum elevation position H1 and the movement unit 10, with respect to the carriage means 3, is arranged in a respective maximum elevation position H2.
  • the group of products 100 housed in the containing casing 200 can be introduced on the first roller conveyor 41 inside the machine 1 along the advancement direction B.
  • a second step ( Figure 14 ) the carriage means 3 is moved to a respective minimum elevation position L1 and the movement unit 10, with respect to the carriage means 3, is moved to a respective minimum elevation position L2 to enable the gripping means 20 to hook the containing casing 200.
  • the gripping means 20 is driven to engage the hooking means 203, 204 of the containing casing 200.
  • a third step ( Figure 15 ) the movement unit 10 is raised partially to a position that is intermediate with respect to the carriage means 3, maintained in the respective minimum elevation position L1, to hook and then lift the containing casing 200 and disengage a lower portion of the group of products 100 and the corresponding pallet 101 to enable wrapping thereof with the film 50.
  • the ring 4 is rotated around the wrapping axis Z and the film 50 is unwound from the unwinding unit 6.
  • a fourth step ( Figure 16 ) the carriage means 3 is lifted to disengage from or progressively taking the containing casing 200 off the group of products 100 and simultaneously enable the film 50 to wrap the latter.
  • the carriage means 3, and thus the containing casing 200 are lifted at a lifting speed that is correlated with a wrapping speed of the film 50 around the group of products 100, in such a manner as to ensure correct binding with the film 50 without compromising the stability of the group of products 100.
  • the lifting speed of the carriage means 3, and/or of the movement unit 10 is calculated in function of one between: rotation speed of the rotating ring 4, speed of unwinding of the film 50 from the reel, elongation or prestretching of the film 50.
  • the products 100 are maintained stable, correctly stacked or superimposed, as they are supported above by the containing casing 200 (which is gradually taken off upwards) and below from the already applied bands or strips of film 50. These latter progressively wrap external portions or surfaces of the group of products 100 left uncovered by the outer casing 200.
  • the final raised position of the carriage means 3 at the end of wrapping is a function of the height of the group of products 100.
  • a fifth step ( Figure 17 ) the movement unit 10 is arranged, with respect to the carriage means 3, in the respective maximum elevation position H2 to enable the covering unit to lay a covering sheet on the group of products 100.
  • a sixth step which is not shown, the carriage means 3 is thus lowered and subsequently lifted to enable the covering sheet to be bound to and immobilised on the group of products 100 with the film 50.
  • the ring 4 is rotated and the film 50 is unwound from the unwinding unit 5.
  • the gripping, cutting and welding unit 7 is driven to grasp and cut the film 50, retaining the first flap connected to the reel and welding the second free flap to the film 50 already wrapped on the group of products 100.
  • the fifth step and the sixth step are replaced by a single step that arranges the movement unit 10 in the respective maximum elevation position H2 and the subsequent driving of the gripping, cutting and welding unit 7 to terminate the wrapping.
  • a seventh step ( Figure 18 ), after arranging carriage means 3 in the respective maximum elevation position H1, the group of products 100 wrapped with the film 50, and possibly with the covering sheet, is moved outside the machine 1 along the advancement direction B.
  • an eighth step ( Figure 19 ) the carriage means 3 and the movement unit 10 are moved to the respective minimum elevation position L1, L2 in such a manner as to deposit the empty containing casing 200 on the first roller conveyor 41.
  • the gripping means 20 of the movement unit 10 is thus disengaged from the hooking means 203, 204 of the containing casing 200.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Basic Packing Technique (AREA)
EP11188594A 2010-11-11 2011-11-10 Machine et procédé pour l'emballage des produits Withdrawn EP2452882A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMO2010A000322A IT1402592B1 (it) 2010-11-11 2010-11-11 Macchina e metodo per avvolgere prodotti

Publications (1)

Publication Number Publication Date
EP2452882A1 true EP2452882A1 (fr) 2012-05-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP11188594A Withdrawn EP2452882A1 (fr) 2010-11-11 2011-11-10 Machine et procédé pour l'emballage des produits

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EP (1) EP2452882A1 (fr)
IT (1) IT1402592B1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013207360A1 (de) * 2013-04-23 2014-10-23 Dücker Group GmbH Vorrichtung und Verfahren zum Umfalten und Verschweißen von Folienüberständen beim Umhüllen von gestapelten Gütern mit einer Folie
CN104828269A (zh) * 2015-03-13 2015-08-12 武汉市美奇斯机械设备有限公司 一种带有顶升平台的龙门包裹机
CN113474257A (zh) * 2019-02-27 2021-10-01 罗宝莫股份公司 自推进式包装机及包装方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0811554A1 (fr) * 1996-05-06 1997-12-10 ROBOPAC SISTEMI S.r.l. Appareil d'emballage de charges palettisées avec une bande en matière plastique
US6594970B1 (en) * 1999-06-10 2003-07-22 Quipp Systems, Inc. Method and apparatus for wrapping palletized bundles

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0811554A1 (fr) * 1996-05-06 1997-12-10 ROBOPAC SISTEMI S.r.l. Appareil d'emballage de charges palettisées avec une bande en matière plastique
US6594970B1 (en) * 1999-06-10 2003-07-22 Quipp Systems, Inc. Method and apparatus for wrapping palletized bundles

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013207360A1 (de) * 2013-04-23 2014-10-23 Dücker Group GmbH Vorrichtung und Verfahren zum Umfalten und Verschweißen von Folienüberständen beim Umhüllen von gestapelten Gütern mit einer Folie
CN104828269A (zh) * 2015-03-13 2015-08-12 武汉市美奇斯机械设备有限公司 一种带有顶升平台的龙门包裹机
CN113474257A (zh) * 2019-02-27 2021-10-01 罗宝莫股份公司 自推进式包装机及包装方法

Also Published As

Publication number Publication date
IT1402592B1 (it) 2013-09-13
ITMO20100322A1 (it) 2012-05-12

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