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EP4201824A1 - Machine d'emballage permettant d'emballer par feuille extensible - Google Patents

Machine d'emballage permettant d'emballer par feuille extensible Download PDF

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Publication number
EP4201824A1
EP4201824A1 EP21217890.9A EP21217890A EP4201824A1 EP 4201824 A1 EP4201824 A1 EP 4201824A1 EP 21217890 A EP21217890 A EP 21217890A EP 4201824 A1 EP4201824 A1 EP 4201824A1
Authority
EP
European Patent Office
Prior art keywords
packaging
lifting table
tray
belt
film
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.)
Pending
Application number
EP21217890.9A
Other languages
German (de)
English (en)
Inventor
Kurt WIßMANN
Thomas Schoen
Jonas LAUER
Winai NAMSUK
Konstantin Rempel
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.)
Bizerba SE and Co KG
Original Assignee
Bizerba SE and Co KG
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 Bizerba SE and Co KG filed Critical Bizerba SE and Co KG
Priority to EP21217890.9A priority Critical patent/EP4201824A1/fr
Priority to US18/081,768 priority patent/US12139283B2/en
Publication of EP4201824A1 publication Critical patent/EP4201824A1/fr
Pending 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
    • B65B11/54—Wrapping by causing the wrapper to embrace one end and all sides of the contents, and closing the wrapper onto the opposite end by forming regular or irregular pleats
    • 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
    • B65B35/20—Feeding, e.g. conveying, single articles by reciprocating or oscillatory pushers
    • B65B35/205—Feeding, e.g. conveying, single articles by reciprocating or oscillatory pushers linked to endless conveyors
    • 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
    • B65B41/00—Supplying or feeding container-forming sheets or wrapping material
    • B65B41/02—Feeding sheets or wrapper blanks
    • B65B41/04—Feeding sheets or wrapper blanks by grippers

Definitions

  • the present invention relates to a method for operating a packaging machine for wrapping packaging trays for foodstuffs with a packaging film, in particular a plastic film, in which the packaging film is fed to a holding mechanism with two holding means spaced apart from one another in order to hold the packaging film fed in on two opposite sides, and then a supplied wrapping tray is pressed against the supplied wrapping film by being lifted from below, and then the opposite sides of the wrapping film are passed under the wrapping tray.
  • the packaging tray is raised by a lifting device, which lifts a lifting table designed to receive the packaging tray from a transfer position to a packaging position, and the packaging tray is transported via a feed belt from a loading position to the transfer position.
  • the invention relates to a packaging machine for carrying out a method according to the invention for operating a packaging machine.
  • Packaging trays in which food products are packaged are known from supermarkets, with the food product and the packaging tray being wrapped in a stretch film.
  • packaging trays for food products are also referred to as trays.
  • a packaging machine is used for packaging, which comprises a feed device for feeding in the packaging film, a holding mechanism for holding the fed packaging film on two opposite sides, and a feed belt with which the packaging trays with the food products are lifted by a lifting device, in particular a lifting table.
  • the lifting device then lifts the supplied packaging tray against the stretch film so that the stretch film is stretched over the packaging tray.
  • the stretch film is pretensioned, ie the distance between the two holding means is increased after the stretch film has been fed in and before the packaging tray with the food product is lifted against the stretch film.
  • the packaging film is then guided around the packaging tray by means of lateral folding pliers and rear folding pliers and folded under the bottom of the tray. When leaving the lifting device, the front end of the film is also folded under the bottom of the tray.
  • the stretch film is then welded under the packaging tray, for example using a heating plate over which the packaging tray is guided.
  • the packaging tray with the food is then completely enclosed by a tensioned stretch film.
  • Such a packaging machine is, for example, from EP 1 728 720 B1 known.
  • a stretch film that can be processed by such a packaging machine is, for example, from EP 0 687 558 A2 known.
  • the packaging shells are aligned parallel to the transport direction of the infeed belt, so that they can then reach the lifting table of the lifting device aligned parallel to the packaging film. If the packaging trays are twisted in the horizontal plane to the packaging film on the lifting table, malfunctions can occur during the packaging process or the packaging appearance and in particular the way the folding pliers fold the packaging film under the packaging tray is unsatisfactory. Out of this reason will be in the EP 1 728 720 B1 the packaging tray is aligned with a complex mechanism before it reaches the lifting table.
  • the object of the invention is to provide a method and an apparatus which solves the problem of misalignment of the packaging in a simpler way than in the prior art.
  • a method for operating a packaging machine for wrapping packaging trays for foodstuffs with a packaging film is proposed.
  • the packaging film is fed to a holding mechanism having two spaced-apart holding means for holding the supplied packaging film on two opposite sides.
  • a supplied packaging tray is then pressed against the supplied packaging film by lifting it from below.
  • the opposite sides of the packaging film are then guided under the packaging tray.
  • the packaging tray is raised by a lifting device, which lifts a lifting table designed to receive the packaging tray from a transfer position into a packaging position.
  • the packaging tray is transported from a loading position to the transfer position via a feed belt.
  • the lifting table is held in a middle position by the lifting device, while the feed belt transports the packaging tray on an intermediate piece between the loading position and the transfer position.
  • the lift table includes alignment fingers below the support surface of the lift table.
  • the alignment fingers are located in the conveying path of the infeed belt, in particular in the conveying path of the intermediate piece of the infeed belt when the lifting table is arranged in the middle position.
  • the alignment fingers are not in the conveyor path of the infeed belt when the lifting table is in the transfer position.
  • the packaging tray is pressed against the aligning fingers by the feed belt during transport from the loading position to the transfer position when the lifting table is in the middle position.
  • the aligning fingers form a straight stop for the packaging tray, which runs orthogonally to the transport direction of the conveyor belt, and the packaging tray is pressed against the aligning fingers by the transport movement of the infeed belt.
  • the infeed belt has a coefficient of friction such that the packaging tray is transported on the infeed belt in the transport direction when the infeed belt moves in the conveying direction and the packaging tray slips on the infeed belt when the packaging tray abuts the alignment fingers and the infeed belt moves in transport direction moved.
  • the lifting table is lowered from the middle position into the transfer position by the lifting device after the packaging tray has hit the aligning fingers.
  • the lifting device lowers the lifting table from the middle position to the transfer position in a shorter time than the infeed belt transports the packaging tray from an upper edge of the alignment fingers to a front edge of the lifting table.
  • the time at which the packaging tray is abutted by the alignment fingers is determined by the expiration of a timer that is started when the packaging tray is transferred from a weigh belt to the infeed conveyor. In one embodiment, the time at which the packaging tray is abutted against the alignment fingers is determined by a sensor near or on the alignment fingers.
  • the lifting table is raised from the transfer position into the packaging position by the lifting device after the packaging tray has been moved onto the lifting table by the feed belt into the transfer position.
  • a packaging machine for wrapping packaging trays for foodstuffs with a packaging film is proposed.
  • the packaging machine is particularly suitable for carrying out the method according to the invention.
  • the packaging machine comprises a feed device for feeding the packaging film, a holding mechanism with two holding means spaced apart from one another in order to hold the supplied packaging film on two opposite sides, the distance between the two holding means being adjustable, a feed belt for feeding the packaging trays from a loading position a transfer position.
  • the packaging machine includes a lifting device in order to move the supplied packaging tray on a lifting table by lifting it from below from the transfer position into a packaging position and to press it against the supplied packaging film.
  • the packaging machine includes an operating mode in which the lifting table is held in a middle position by the lifting device, while the feed belt transports the packaging tray on an intermediate piece between the loading position and the transfer position.
  • the lift table includes alignment fingers below the support surface of the lift table.
  • the alignment fingers are located in the conveying path of the infeed belt, in particular in the conveying path of the intermediate piece of the infeed belt when the lifting table is arranged in the middle position.
  • the alignment fingers are not in the conveyor path of the infeed belt when the lifting table is in the transfer position.
  • the lifting table consists of a base plate on which several rod-shaped mounts are attached.
  • tilting heads are attached to the tops of the brackets.
  • the heads form a support surface of the lifting table for the packaging tray.
  • L-shaped alignment fingers are attached to the base plate and point downwards, which form a stop in the transport path of the infeed conveyor when the lifting table is in the middle position.
  • the feed belt is designed as a belt made up of several belts running parallel in the transport direction, with each belt being guided around a rear deflection roller in the transport direction, and with the rear deflection rollers in particular overlapping the base of the lifting table in the horizontal plane.
  • the stop fingers are positioned between the belts when the lift table is in the center position.
  • the base plate comprises recesses so that the base plate can be moved through the conveying plane formed by the belts.
  • the belts of the feeder belt move through the recesses when the base plate is moved vertically.
  • FIG. 1 shows a schematic representation of a packaging machine 1.
  • a schematic top view and in the lower part of the figure a side view of the packaging machine 1 is represented.
  • the packaging machine 1 comprises a film dispensing device 217, a film feed device 216, a film transport device 214 and a film cutting device 215 arranged between the film feed device 216 and the film transport device 214.
  • a roll of packaging film K in particular a plastic film, can be placed in the film dispensing device 217 and there by a film holder or roll holder can be held. An unwound end of the packaging film K can then be transferred to the film transport device 214 by means of the film feed device 216 .
  • the film transport device 214 has two parallel, spaced-apart belt conveyor devices 201 and 202 for transporting the supplied packaging film K on two opposite sides in a transport direction X until the front edge of the packaging film K arrives at the front end of the film transport direction 214, viewed in the transport direction X whereupon the film transport is stopped and the packaging film K is separated from the rest of the film roll by the film cutting device 215 .
  • the belt conveyors 201 and 202 are designed to in particular to keep the separated packaging film K clamped on the two opposite sides.
  • lifting actuators (not shown) can be provided, such as are basically known from the prior art.
  • the film transport device 214 is designed in such a way that the distance between the two belt conveyor devices 201 and 202 can be adjusted.
  • the first belt conveyor device 201 or the second belt conveyor device 202 or both belt conveyor devices 201 and 202 can be moved simultaneously transversely to the film transport direction X, in particular by means of a motor drive which is controlled by a control unit of the packaging machine 1.
  • the packaging machine 1 has a feed belt 102 via which packaging trays P to be wrapped with the packaging film K and containing food products can be fed to a lifting table 105 of the packaging machine 1 .
  • the feed belt 102 consists of several belts arranged in parallel, which engage in the lifting table.
  • the lifting table 105 is designed to transport a respective packaging tray P upwards to the packaging foil K held in the foil transport device 214 in such a way that the packaging tray P is pressed against the packaging foil K from below, so that the packaging foil K automatically turns over during the lifting process the packaging tray P lays.
  • This upper position of the lifting table 105 is the packaging position.
  • the lower position of the lifting table 105, in which the packaging tray P is conveyed onto the lifting table 105 by means of the feed belt 102, is the transfer position.
  • Upstream of the feed belt 102 is a weighing belt 101 with an integrated scale, with which the weight of the packaging tray P and the food product can be determined.
  • This is fundamental for packaging machines 1 optional and is used for packaging machines 1 which are suitable for providing a packaging tray P with a label which indicates the weight of the packaging tray P with the food product contained.
  • a printer connected to the scale 101 can then print out a label on which the weight of the filled packaging tray P is indicated.
  • the labeling device takes the label from the printer and applies it to the packed packaging tray P.
  • the packaging tray P is placed by an operator on the weighing belt 101 or, in the case of a packaging machine 1 without a weighing belt 101, on the front part of the feed belt 102. This is the loading position of the packaging machine.
  • a camera 103 is provided in the infeed area of the packaging machine, ie in the infeed area of the infeed belt 102 or on the weighing belt 101, with which different tray types can be recognized.
  • the packaging process is adjusted by the control unit according to the recognized packaging tray P.
  • a light barrier 104 can also be used to determine when a packaging tray is being moved by the infeed belt 102 against the aligning fingers located on the lifting table 105 .
  • the lifting table is referred to below 2 , 3a and 3b described.
  • the packaging film K is guided downwards around the packaging tray P at the side and rear by means of lateral folding pliers 108a and 108b and by means of rear folding pliers 110 and folded under the packaging tray P or the bottom of the packaging tray P .
  • the packaging tray P is then pushed out of the film packaging area onto a sealing plate 107 by a pusher 109, as a result of which the front end of the packaging film K is also folded under the packaging tray P.
  • the sealing plate 107 is heated to a temperature in which the ends of the packaging film K folded under the packaging tray P are welded or sealed to one another.
  • the packaged packaging tray P with a in the 1 Labeling device are provided with a label that includes, among other things, the weight determined by the scales 101, and then transported out of the packaging machine via a cross conveyor belt 106.
  • a plastic film which is extensible i.e. a so-called stretch film, can be used as the packaging film.
  • This packaging film is thermoplastic and can be sealed or welded at high temperature.
  • the thickness of the packaging film is usually in a range between 10 ⁇ m and 60 ⁇ m.
  • FIG. 2 shows a packaging machine 1 in a front view.
  • a front opening forms a train guide channel, at the entrance of which the weighing belt 101 is located.
  • the feed belt 102 is arranged following the weighing belt 101 .
  • the feed belt 102 is designed as a belt conveyor belt with four belts running in parallel.
  • the belts of the infeed conveyor form a horizontal plane on which the packaging tray P stands with its underside.
  • the feed belt 102 that is, the belts of the feed belt 102, lead to a lifting table 105.
  • the lifting table 105 is in Figure 3a and 3b shown in more detail and consists of several rod-shaped holders, on the top of which tilting heads are attached.
  • the heads form a support surface for the packaging tray.
  • the belts of the feed belt lead into the gaps between the rod-shaped holders.
  • the horizontal plane formed by the belts of the infeed conveyor is located slightly above the horizontal plane formed by the heads. This has the effect of a packaging tray P can be transported onto the lifting table 105 on the belt of the infeed conveyor.
  • the elevating table 105 is raised, the packaging tray P is pushed up by the heads and removed from the feed belt 102 .
  • Figure 3a shows the lifting table 105 of the packaging machine 1 in the transfer position, ie in the lower position.
  • Figure 3b shows the lifting table 105 of the packaging machine 1 in the middle position, i.e. in the position in which the packaging tray P is pressed with the infeed belt 102 against the alignment fingers when the packaging tray on the infeed belt is moved on an intermediate piece between the loading position and the transfer position.
  • the middle position and the packaging position differ only slightly. It only has to be ensured that in the middle position the upper edge of the heads does not touch the packaging film K that is already in the holding means.
  • the lifting table 105 ie the lifting device, consists of a carrier 301 which is connected to a frame of the packaging machine 1. It comprises a motor 302 to which a lifting mechanism 303 is connected. The lifting mechanism moves rods 311 fixed to the carrier 301 with a sliding bearing 312 in the vertical direction.
  • a base plate 304 of the lifting table 105 is located on the rods 311.
  • the base plate comprises four recesses 310 which are open towards the front and into which the belts of the feed belt 102 can engage.
  • a plurality of rod-shaped holders 305 are fastened on the base plate 304 and protrude upwards from the base plate 304 in the vertical direction. Tiltable heads 306 are arranged at the upper end of the rod-shaped holders 305 .
  • the tilting heads 306 form a horizontal plane 308 on which the packaging tray rests when it is moved vertically upwards with the lifting mechanism.
  • the heads 306 are tiltable and will tip over upon contact with the folding pliers so as not to impede movement of the folding pliers.
  • On the base plate are L-shaped alignment fingers pointing downwards 309 attached.
  • the alignment fingers 309 form a stop in the transport direction, which is aligned orthogonally to the transport direction.
  • the belts of the feed belt 102 form a horizontal plane 307, indicated schematically, which is slightly higher in the vertical direction than the plane 308 formed by the heads 306 when the lifting table 105 is in the transfer position ( Figure 3a ).
  • the belts of the feed belt 102 form a schematically indicated horizontal plane 307 through which the aligning fingers 309 protrude in the vertical direction ( Figure 3b ).
  • the alignment fingers thus form a stop aligned orthogonally to the direction of transport of the feed belt.
  • a packaging tray that is transported on the feed belt 102 in the transport direction thus strikes against the vertical plane formed by the stop fingers 309 . Due to the fact that the stop fingers form a plane orthogonal to the plane 307 of the feed belt 102, the packaging tray is aligned perpendicular to the transport direction by the alignment fingers 309.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • ROM read only memory
  • RAM random access memory

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
EP21217890.9A 2021-12-27 2021-12-27 Machine d'emballage permettant d'emballer par feuille extensible Pending EP4201824A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP21217890.9A EP4201824A1 (fr) 2021-12-27 2021-12-27 Machine d'emballage permettant d'emballer par feuille extensible
US18/081,768 US12139283B2 (en) 2021-12-27 2022-12-15 Packaging machine for packaging using stretch wrap

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21217890.9A EP4201824A1 (fr) 2021-12-27 2021-12-27 Machine d'emballage permettant d'emballer par feuille extensible

Publications (1)

Publication Number Publication Date
EP4201824A1 true EP4201824A1 (fr) 2023-06-28

Family

ID=79164982

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21217890.9A Pending EP4201824A1 (fr) 2021-12-27 2021-12-27 Machine d'emballage permettant d'emballer par feuille extensible

Country Status (2)

Country Link
US (1) US12139283B2 (fr)
EP (1) EP4201824A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06270907A (ja) * 1993-03-12 1994-09-27 Ishida Co Ltd 包装装置の処理能力制御装置
EP0687558A2 (fr) 1994-05-19 1995-12-20 Viskase Corporation Film étirable en polyoléfine
EP1728720B1 (fr) 2005-06-01 2008-10-08 Ishida Co., Ltd. Dispositif d'emballage
EP3187425A1 (fr) * 2015-12-30 2017-07-05 Bizerba SE & Co. KG Procede destine au fonctionnement d'une machine d'emballage

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06270907A (ja) * 1993-03-12 1994-09-27 Ishida Co Ltd 包装装置の処理能力制御装置
EP0687558A2 (fr) 1994-05-19 1995-12-20 Viskase Corporation Film étirable en polyoléfine
EP1728720B1 (fr) 2005-06-01 2008-10-08 Ishida Co., Ltd. Dispositif d'emballage
EP3187425A1 (fr) * 2015-12-30 2017-07-05 Bizerba SE & Co. KG Procede destine au fonctionnement d'une machine d'emballage

Also Published As

Publication number Publication date
US20230202695A1 (en) 2023-06-29
US12139283B2 (en) 2024-11-12

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