EP0085390A2 - Procédé pour envelopper une pile d'objets à l'aide de plusieurs enroulements d'une bande de matériau extensible - Google Patents

Procédé pour envelopper une pile d'objets à l'aide de plusieurs enroulements d'une bande de matériau extensible Download PDF

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Publication number
EP0085390A2
EP0085390A2 EP83100705A EP83100705A EP0085390A2 EP 0085390 A2 EP0085390 A2 EP 0085390A2 EP 83100705 A EP83100705 A EP 83100705A EP 83100705 A EP83100705 A EP 83100705A EP 0085390 A2 EP0085390 A2 EP 0085390A2
Authority
EP
European Patent Office
Prior art keywords
web
stack
roll
packaged goods
supply roll
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.)
Granted
Application number
EP83100705A
Other languages
German (de)
English (en)
Other versions
EP0085390A3 (en
EP0085390B1 (fr
Inventor
Jörg Meyer
Dieter Wegner
Joachim Janssen
Michael Löwe
Hans-Peter Eichstädt
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.)
SANPACK LAGERTECHNIK GMBH
Original Assignee
Sanpack Lagertechnik GmbH
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 Sanpack Lagertechnik GmbH filed Critical Sanpack Lagertechnik GmbH
Priority to AT83100705T priority Critical patent/ATE34959T1/de
Publication of EP0085390A2 publication Critical patent/EP0085390A2/fr
Publication of EP0085390A3 publication Critical patent/EP0085390A3/de
Application granted granted Critical
Publication of EP0085390B1 publication Critical patent/EP0085390B1/fr
Expired 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
    • B65B11/04—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material the articles being rotated
    • B65B11/045—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material the articles being rotated by rotating platforms supporting the articles

Definitions

  • the invention relates to a method and a device for wrapping a stack of packaged goods with several, in particular helically arranged turns of a web of stretch film, which is guided from a supply roll over a second roll under an expansion achieved by braking the supply roll to the circumference of the packaged goods stack.
  • the stretching mechanism formed by the two rollers is driven by the force exerted by the stack of goods on the web running off the second roller. Due to the constant differential speed between the two rollers, the stretching of the film is to be achieved without having to resort to the braking of the supply roll, which often leads to uneven braking force and thus to uneven stretching. In fact, a strong and uniform stretching of the film can be achieved by means of the pair of rolls, the force which must be exerted on the web from the periphery of the packaged goods to drive the pair of rolls, with an idealizing calculation, being less than that for the stretching between the rolls acting web force.
  • the invention is therefore based on the object of providing a method and a device of the type mentioned at the outset which permit gentle stretching of the web and low-tension feeding of the stretched web onto the circumference of the stack of goods.
  • the solution according to the invention is that the web is driven by the second, driven roll at a peripheral speed which is higher than the average peripheral speed the stack of packaged goods.
  • the stretch is achieved between the braked supply roll and the driven second roll, the circumferential speed of this second roll being so much greater than the circumferential speed of the packaged goods stack that the film stretch initially achieved is a little between the second roll and the surface of the packaged goods stack can regress.
  • This partial relaxation of the stretch is associated with a disproportionately strong relaxation of the web.
  • the reason for this is that the web has been stretched beyond the elastic deformation range and this stretching could therefore only be reversed in a substantially longer period of time than is available between the second roll and the packaged goods stack.
  • the web runs largely relaxed but still very stretched on the surface of the packaged goods. This achieves what was attempted by the second known method described, but which was not achieved or was achieved only incompletely.
  • the tension with which the web is allowed to run onto the circumference of the stack of packaged goods can be chosen to be as low as desired, because it has no effect on the degree of stretching previously achieved between the supply roll and the second roll.
  • the film is stretched much more gently than in this known method. Among other reasons, this should be largely due to the fact that as a result of the storage of the supply roll trained strong adhesion of the film layers to each other, the stretching only begins when the film has detached from the film roll, while it got on The process already begins when the film is still under friction on the first roller of the pair of rollers, so that the tensile stress adds to the frictional stress, which can have a particularly destructive effect on defects.
  • the second roller is preferably driven at a peripheral speed which is 20 to 100% greater than the average peripheral speed of the packaged goods.
  • a slow stretching has proven to be expedient, which can be achieved according to the invention by providing a running time of at least about 0.1 seconds for the film between the supply roll and the second roll.
  • the rate of stretch should not be greater than about 100% per 0.1 second.
  • the distance within which the stretch between the supply roll and the second roll is made should not be less than about 15 cm.
  • a machine for performing the method takes over from the prior art a turntable for the stack of packaged goods, one arranged to the side of the turntable, with a ver adjustable brake provided receiving shaft for a supply roll and a second roll deflecting the film between the supply roll and the turntable. It is characterized according to the invention in that the second roller is provided with a drive for a peripheral speed which is higher than the average peripheral speed of the packaged goods.
  • a turntable 2 is embedded in the base plate 1 and is connected to a drive (not shown) which can be switched on and off and which gives it a rotational speed of, for example, 10 revolutions per minute.
  • the machine stand 3 which contains the operating, control and drive elements, rises on the base plate 1 to the side of the turntable 2 and parallel to its axis of rotation, that is to say vertically. It has a vertical guide 4 for a carriage 5, on which a bearing 6 with an adjustable brake for a shaft for receiving a supply roll 7 of a film web is fixedly arranged in a known and therefore not further explained manner. Furthermore, the bearing arrangement 9 with drive motor 10 for the second roller 11 is attached to it via an arm 8. These parts can be moved vertically on the carriage 5 by means of a drive (not shown) at a constant or varying speed.
  • the shaft 7 and the roller 11 are arranged parallel to one another and to the axis of rotation of the turntable 2 at the same height at such a distance from one another that the free path of the film web between the Supply roll 7 and roll 11 is on the order of 20 cm.
  • the roller 11 has a peripheral speed of, for example, 60 m per minute.
  • a stack of packaged goods is indicated on a standard pallet 13. If its circumference coincides with that of the pallet, it is about 4 m long. At a rotation speed of 10 min-1, this results in a circumferential speed of the packaged goods stack of approximately 40 m per minute. This means that in the given example, the length of the web on reaching the packaged goods stack decreases to about 2/3 of its stretched length for the roller 11, if the slip on the roller 11 is neglected. The stretching of the film between the supply roll 7 and the second roll 11 must therefore be correspondingly higher in the given example. This is easily achieved by trial adjustment of the brake 6. From this brake setting, given a ratio of the peripheral speed of the packaged goods stack 12 and the roller 11, the tension that is still contained in the film web running onto the packaged goods stack also depends.
  • the operating personnel set it so that it is low enough to prevent damage to the film at the edges and corners of the packaged goods, for example in the order of 30 N with a web width of about 0.5 m. If one wanted to achieve the same degree of stretching with which the film then runs onto the stack of packaged goods only by pulling the stack of packaged goods, this force would be about five times higher. In the known machine described at the outset, in which the stretching mechanism consisting of a pair of rollers is driven by the web train caused by the stack of packaged goods, this force is at least three times as great.
  • the invention therefore makes it possible to wrap packaged goods with extremely low weight or extremely difficult surfaces (for example, protruding screws) without damage to the packaged goods or the web. Nevertheless, packaging with a high packing tension is achieved because the stretch contained in the film while it is still running onto the packaged goods gradually tries to settle and a correspondingly high tension is built up in the film.
  • the machine works as follows. After a pallet 13 with packaged goods stack 12 has been placed on the turntable 2, the leading end of the film web is first lightly attached to the packaged goods stack, for example by pulling it into the gap between two packets. The carriage 5 is in its lowest position with the supply roll at the height of the pallet and the lowest packing layer. The turntable 2 is then allowed to start, with the brake 6 not yet or only weakly switched on, so that a film winding can initially be placed around the stack of goods without substantial tension. Then the function of the brake begins gradually. This begins the stretching of the film area 14 between the supply roll 7 and the roll 11. As the wrapping of the pack of goods progressively wraps, the carriage 5 is raised on the guide 4, so that the web windings lie helically on the surface of the pack of goods with a small overlap next to one another.
  • the running time between the supply roll and the driven roll should be at least 0.1 and better at least 0.2 seconds. In the example given, it is around 0.3 seconds.
  • the rate of expansion should not be greater than 100% per 0.1 seconds, preferably not greater than 100% per 0.2 seconds.
  • the tensile force in an originally 0.5 m wide web between the packaged goods stack and the driven roller should generally be between 20 and 100 N.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
  • Packaging Of Special Articles (AREA)
EP83100705A 1982-01-29 1983-01-26 Procédé pour envelopper une pile d'objets à l'aide de plusieurs enroulements d'une bande de matériau extensible Expired EP0085390B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83100705T ATE34959T1 (de) 1982-01-29 1983-01-26 Verfahren zum umwickeln eines packgutstapels mit mehreren windungen einer bahn aus dehnfolie.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3202872 1982-01-29
DE19823202872 DE3202872A1 (de) 1982-01-29 1982-01-29 Verfahren und vorrichtung zum umwickeln eines packgutstapels mit mehreren windungen einer bahn aus dehnfolie

Publications (3)

Publication Number Publication Date
EP0085390A2 true EP0085390A2 (fr) 1983-08-10
EP0085390A3 EP0085390A3 (en) 1984-07-18
EP0085390B1 EP0085390B1 (fr) 1988-06-08

Family

ID=6154217

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83100705A Expired EP0085390B1 (fr) 1982-01-29 1983-01-26 Procédé pour envelopper une pile d'objets à l'aide de plusieurs enroulements d'une bande de matériau extensible

Country Status (3)

Country Link
EP (1) EP0085390B1 (fr)
AT (1) ATE34959T1 (fr)
DE (2) DE3202872A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985005216A1 (fr) * 1984-05-03 1985-11-21 Unifos Kemi Ab Composition isolante pour cables
EP0250383A2 (fr) * 1986-06-19 1987-12-23 New Pac Systems AB Procédé et appareil pour envelopper un article
CN113636136A (zh) * 2021-07-08 2021-11-12 陈露 一种应用于物流运输的节能捆扎包装设备

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2281275A1 (fr) * 1974-08-08 1976-03-05 Thimon Procede et dispositif d'emballage de charges au moyen d'un film de matiere plastique etirable
GB2059906A (en) * 1979-09-12 1981-04-29 Lancaster W G A process and apparatus for wrapping loads in stretch films

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NZ198286A (en) * 1980-10-27 1985-07-12 Infra Pak Dallas Inc Pre-stretching film web from feed stock and wrapping palletised load

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2281275A1 (fr) * 1974-08-08 1976-03-05 Thimon Procede et dispositif d'emballage de charges au moyen d'un film de matiere plastique etirable
GB2059906A (en) * 1979-09-12 1981-04-29 Lancaster W G A process and apparatus for wrapping loads in stretch films

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985005216A1 (fr) * 1984-05-03 1985-11-21 Unifos Kemi Ab Composition isolante pour cables
EP0250383A2 (fr) * 1986-06-19 1987-12-23 New Pac Systems AB Procédé et appareil pour envelopper un article
EP0250383A3 (fr) * 1986-06-19 1988-11-23 New Pac Systems AB Procédé et appareil pour envelopper un article
CN113636136A (zh) * 2021-07-08 2021-11-12 陈露 一种应用于物流运输的节能捆扎包装设备

Also Published As

Publication number Publication date
EP0085390A3 (en) 1984-07-18
DE3376974D1 (en) 1988-07-14
EP0085390B1 (fr) 1988-06-08
ATE34959T1 (de) 1988-06-15
DE3202872A1 (de) 1983-08-11

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