EP0798214A1 - Dispositif d'étirage poue étirer une coiffe étirable - Google Patents

Dispositif d'étirage poue étirer une coiffe étirable Download PDF

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Publication number
EP0798214A1
EP0798214A1 EP97710008A EP97710008A EP0798214A1 EP 0798214 A1 EP0798214 A1 EP 0798214A1 EP 97710008 A EP97710008 A EP 97710008A EP 97710008 A EP97710008 A EP 97710008A EP 0798214 A1 EP0798214 A1 EP 0798214A1
Authority
EP
European Patent Office
Prior art keywords
stretch
hood
bracket
rollers
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.)
Granted
Application number
EP97710008A
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German (de)
English (en)
Other versions
EP0798214B1 (fr
Inventor
Werner Uthoff
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.)
Beumer Maschinenfabrik GmbH and Co KG
Original Assignee
Beumer Maschinenfabrik GmbH 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
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Application filed by Beumer Maschinenfabrik GmbH and Co KG filed Critical Beumer Maschinenfabrik GmbH and Co KG
Publication of EP0798214A1 publication Critical patent/EP0798214A1/fr
Application granted granted Critical
Publication of EP0798214B1 publication Critical patent/EP0798214B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/13—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the preformed tubular webs being supplied in a flattened state
    • B65B9/135—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the preformed tubular webs being supplied in a flattened state for palletised loads

Definitions

  • the invention relates to a stretch device for biaxial stretching (ie for considerable stretching) of a stretch film hood formed from a side gusseted tube and consisting of a highly stretchable plastic film, for a packaging machine for wrapping a piece of piece goods with a stretch film hood, the undrawn size of which is considerably smaller than the stack size a plurality of horizontally movable stretch units arranged on a frame, each having a retractable stretch bracket in the pre-opened hood end and from their approximated retracted position via a spreading position in which the stretch bracket arranged in a corner of the hood each Open the hood without stretching and, in general, take up substantially the entire length of the hood, diagonally stretch the hood side walls into a spaced-apart pull-over position and move them together relative to the stack of items to be wrapped, the stretch bars being designed so that they cover the hood side walls When covering each case, impress vertical frictional forces on both sides of the relevant hood corner edge at a considerable distance from a hood corner, which
  • uniform, stackable piece goods such as sacks filled with cement
  • a so-called palletizer generally on pallets
  • the piece goods stack can also have other geometric shapes.
  • piece goods stacks are protected from environmental influences, in particular weather influences, during storage and transport, and to give them sufficient stack strength during implementation and transport, in which the piece goods stacks are firmly attached to at least their top and side surfaces Plastic film to be wrapped. In one of these processes, this takes place in that the piece goods stacks are fed one after the other to a packaging machine which covers them from above with a film hood.
  • Foil hoods are generally expediently formed from a so-called gusseted tube, which has two mutually parallel side surfaces and two V-shaped between it has folded-in side surfaces, all side surfaces running parallel and lying against one another in the stored state.
  • the film hood consists of so-called shrink film
  • the circumference of the hose or hood is somewhat larger than the circumference of a stack to be wrapped.
  • the hose or the hood is easily pre-opened at the free end, for example by suction devices, by moving the parallel side surfaces so far apart that receiving elements move into the pre-opened end and "stretch" the hood by spreading it apart, that is to say that it is (fully) free of expansion .
  • the film is shrunk onto the stack by applying heat.
  • the film hood consists of so-called stretch film
  • the circumference of the hose or the unstretched hood is considerably smaller than the circumference of the stack of items.
  • the hoods must therefore be circumferentially stretched to a covering dimension such that they can be pulled over a stack of general cargo in the covering position. After covering, the hood then lies firmly against the stack under the permanent elastic stretch and ensures, among other things. for the desired stack strength.
  • transverse stretching is carried out by means of a stretch device integrated into the packaging machine, in that the pre-opened hood is positioned essentially centrally over the stack of stretch bars of the stretch device to be wrapped is picked up and first stretched by diagonally moving apart in a spreading position (still unstretched) so that their side faces each run essentially parallel to a side face of the stack to be wrapped. In this spread position, the hood side walls are thrown onto the stretch bracket. Since the hood circumference is considerably smaller than the stack circumference, the hood side walls are each offset inwards from the parallel stack side wall in the spread-out position. The hood is then stretched crosswise by moving the stretch bars diagonally apart into the pull-over position.
  • a stretch device therefore has four stretch brackets for enveloping cuboid or cube-shaped stacks.
  • the stretch brackets retracted into the pre-opened hood end are intended to stretch the hood side walls across their entire height, their extension in the direction of the hood longitudinal axis is generally considerably smaller than the hood length in order to reduce the required height. Therefore, the hood side walls before the cross stretching of the hood are reefed onto the stretch bars by reefing means, so that the hood side walls are then taken up in folds by the stretch bars.
  • the reefing devices generally consist essentially of a driven reefing roller with a horizontal axis, which can be moved from the outside to the relevant stretch bracket after it has come into contact with the inside of the hood, so that the hood side walls at the same time Approaching all reefing rollers on their respective stirrups and correspondingly driving the reefing rollers are to be thrown completely onto the stretching stirrups.
  • hoods are generally not supplied to the packaging machine in the finished state, but rather are formed in / from it, in each case from a section of a gusseted tube, which is stored in the packaging machine in the folded-up state, rolled up into a roll, and with its free end is fed to a hood forming device of the packaging machine.
  • the end of the hose is generally pre-opened (generally by suction devices or wedge plates) so that the hose can be received at its end by receiving elements, which are generally the stretch brackets of the stretching device, so that the hood after its completion does not need to be handed over to the stretch device first.
  • the hood is formed by placing a cross weld seam at a distance from the end of the hose and separating the section provided with the cross weld seam and forming the hood from the hose supply.
  • the unstretched circumference of stretch film hoods is generally chosen to be at least 10-20% smaller than the circumference of the stack of piece goods to be wrapped, so that a corresponding transverse stretch (transverse stretch) of 10-20% occurs in the finished loading units.
  • stretch films have already been made available or are in development, which allow even larger elongations of up to 50% and more.
  • hood side walls of the finished loading units are stretched substantially uniformly.
  • a stretch film hood is stretched evenly evenly before being pulled over the stack on the stretch brackets and is not prevented from this by friction on the stretch brackets, since in such cases there is not only very different stretching the hood side walls but can also come within a hood side wall, so that, if necessary, greatly expanded hood side wall sections are overstretched, while the expansion potential of other hood side wall sections, which on the other hand are considerably less stretched, is not used.
  • the stretch bars were initially designed as rod-shaped or finger-shaped elements that protrude from the stretch frame with a longitudinal axis running parallel to the longitudinal axis of the hood or into one after / after entering the open hood end such position are pivotable (see DE 37 07 877 A1, for example). It lies down when moving apart of the stretch units from their approximated retracted position into their pull-apart position from each other, the inner side of the hood against an outer circumferential section of each stretch finger and, when the hood side walls are stretched, is pressed against the stretch fingers with increasing pressure.
  • the frictional forces thus created between the film and the stretch brackets may have the consequence that no stretch compensation can take place during cross-stretching between adjacent hood side walls if the hood side walls adjacent to a stretch bracket are stretched to different extents when the stretch units are moved apart, since the frictional forces prevent that the film can slide over the stretch bar to create an expansion compensation.
  • Different stretching of adjacent hood side walls occurs, however, if the stretch bars from their spreading position, in which the hood (generally reefed) has been picked up by them, are not moved into the pull-over position in such a way that the mutual distance between adjacent reefing bars varies as a percentage enlarged in the same way so that the area spanned by the stretch brackets is enlarged geometrically similar.
  • a different method of stretching stirrups is, for example, expedient or necessary if the stretching stirrups span a surface in their spread position that is not geometrically similar to the cross-sectional area of the stack (in plan view) and the respective distance between the hood side walls and the adjacent one Side wall of the piece goods stack in the pull-over position should be essentially the same size. If, however, there are significantly different transverse expansions of the hood side walls when the hood is stretched across, overstretching can occur. These strains are also the same when covering the stack with the hood not necessarily completely out, so that an uneven transverse expansion of the hood side walls can remain in the finished loading unit.
  • a significant further disadvantage of these finger-like reefing brackets is that when the stack is pulled over the width of the hood side walls, a satisfactory longitudinal stretch of the hood's side walls cannot be achieved, since finger-like reefing brackets rest essentially only in a line (almost punctiform in plan view) on the hood, so that when pulling only in the corners of the hood in the longitudinal direction of friction forces act on it, which can produce a longitudinal expansion in the corner areas when the hood slides off the stretch bars when pulled over, but not in the areas between the adjacent stretch bars Hood side walls. At least, with such finger-like stretch brackets of the hood, no vertical forces can be impressed, which also cause a considerable longitudinal stretch in the central region of a hood side wall.
  • a spreading device for (unexpanded) spreading (“spreading") a shrink film hood formed from a gusseted tube is known, the circumference of which is greater than the circumference of the stack of articles to be wrapped.
  • This spreading device generally consists of four finger-like vertical rods, which are each arranged at the free end of a horizontally pivotable lever articulated on a lifting frame, are moved together in an approached retracted position into the pre-opened hose or hood end (by suction devices), and then synchronously to be pivoted outwards each under the hood in a corner edge of the hood, stretch the hood in the extended position (unstretched).
  • the spreader bars can optionally be designed as rollers rotatably mounted about their longitudinal axis.
  • this shrink hood expansion device is particularly suitable for large transverse expansions of e.g. 50% is therefore not suitable as a stretch device for stretch film hoods, because the maximum transverse expansion that can be achieved is limited by the length of the lever, it would also be unsuitable for this if the finger-like pick-up rollers could not be swiveled between the retracted and extended positions, but could be moved diagonally.
  • T-shaped stretch brackets a satisfactory longitudinal stretch can be achieved in the hood side walls when the stack is pulled over, it has been shown that, especially with large transverse stretches and the like.
  • the film lying on the horizontal stretch bracket sections cannot stretch, at least not in the same way, during cross stretching as the film sections not acted upon by the stretch bars, so that the latter may be overstretched in sections.
  • a disadvantage of this stretch bracket is, however, that the film is prevented during cross stretching due to the resulting frictional forces from stretching in their contact areas on the stretch bars in the same way as the film sections running between adjacent stretch bars. This is particularly disadvantageous if film material with a very high degree of stretch is used and this is used, i.e. the hood circumference is doubled when stretching, for example, and if the circumferential section of the hood acted upon by the reefing brackets in relation to the distance between two adjacent stretch brackets is relatively large. If, however, essentially only the foil sections lying between adjacent reefing brackets are stretched during transverse stretching, overstretching can occur there.
  • the present invention has for its object to improve a stretch device of the type described in particular in that the hood is stretched iw evenly over its entire circumference in the cross-stretched pull-over position even with extremely high transverse stretches, and that you nevertheless achieve a satisfactory one Vertical stretches at a considerable distance from the hood corners or corner edges should be impressed when the vertical brackets are pulled over, while at the same time it is to be ensured that the hood easily slides off the stretch brackets.
  • the stretch brackets each have a plurality of stretch rollers which are freely rotatable about their longitudinal axis and which are arranged parallel to the longitudinal axis of the hood and have a substantially cylindrical lateral surface, which are arranged such that they essentially mirror-symmetrically when the hood is stretched and pulled over a middle reference plane running parallel to their longitudinal axes through the relevant hood corner abuts the hood.
  • At least some of the cylindrically shaped stretch rollers can be provided with at least one groove-like undercut, into which the hood, which is usually attached to the stretch bracket before the stretching, fits into it, so that these undercuts, as it were, form abutments for the film, by means of which when Excess additional longitudinal forces are to be impressed into the hood side walls without the film being adversely affected as in the prior art, in particular if the transitions of the undercuts to the lateral surface are rounded and the depth of these undercuts - depending on the film material - is not chosen too large.
  • Undercuts of stretch bars are known per se from DE 39 18 311 C2, but not for finger-like stretch elements (here: stretch rollers), but only between a finger-like stretch bar section and a stretch bar section running transversely to this.
  • the hood can be seen to easily hit the stretch bracket by means of a suitable reefing device.
  • FIG. 1 shows a stretch device, denoted overall by 1, for the biaxial stretching of a stretch film hood 2 indicated by a dotted line.
  • the stretch device 1 is part of a packaging machine for wrapping a piece of packaged goods in each case with a stretch film hood 2, the unstretched circumference of which is considerably smaller than the stack circumference.
  • Such a piece goods stack 3 is indicated in Fig. 1 with a dash-dotted line (in plan view). It is recognizable that the piece goods stack 3 has a substantially square base. It is cube-shaped or cuboid.
  • the stretching device 1 has four stretching units 4, which are arranged on a frame 5, which is denoted overall by 5 and extends in a horizontal plane, and which is designed as a lifting frame and can be moved vertically on stands 6 of the packaging machine (not shown in detail).
  • the frame 5 is initially arranged above the piece goods stack 3 and has an outer frame 7 and two double traverses 9 movable in the direction of the double arrow 8 relative to the latter, which can be moved synchronously in opposite directions by means of a drive 10 'via a chain drive 11' in the direction of the double arrow 8 .
  • Each stretch unit 4 has a stretch bracket generally designated 14, this designation in Regarding the terminology common in practice, although each stretch bracket 14 consists of several elements, as will be explained in more detail below.
  • the stretch brackets 14 of all the stretch units 4 can be retracted into the open end of a pre-opened hood 2 fed from above to the open end of the stretch device 1 in a retracted position in which the stretch units 4 are moved even further than shown in FIG. 1.
  • the stretch units 4 are first moved apart into the spread-apart position shown in FIG. 1, in which the stretch brackets 14 stretch the lower end of the hood completely, without already stretching the hood 2.
  • the stretch rollers 16 are arranged mirror-symmetrically to a central reference plane 20 running parallel to their longitudinal axes 19 (see FIG. 7), into which the longitudinal central axis 13 of the stretch unit 4 also falls.
  • the stretch rollers 16 each have an at least substantially cylindrical lateral surface 16 ', the stretch rollers 16.1, 16.2, 16.4 and 16.5 arranged at a distance from the reference plane 20 each having circumferential grooves Undercuts 21 are provided, which merge with rounded edges 22 into the cylindrical outer surface 16 '.
  • the middle stretch roller 16.3 is shortened compared to the other stretch rollers because a reef roller 24 rotatably mounted on a reefing bracket 23 with an axis of rotation 24 ′ running transversely to the longitudinal axes 19 of the stretch rollers 16 'is arranged in its area, which will be explained further below.
  • the upper section 23 'of the reefing bracket 23 clearly forms part of the stretch bracket 14.
  • the stretch units 4 are then moved from the spread position shown in FIG. 1 relative to the shirred hood 2 spanned by the stretch brackets 14 in the direction of their longitudinal central axis 13 into their pull-over position (see FIG. 2), the stretch brackets 14 opening the hood side walls stretch a covering dimension (see dotted line in FIG. 2), in which the hood circumference is larger than the stack circumference and the Stretch bracket 14 with its inside a sufficiently large distance from the stack 3, which allows a safe covering of the hood 2 over the stack 3.
  • the lifting frame 5 is lowered on the stands 6, the hood cover 2 'laying on the upper side of the stack 3 and serving as an abutment when the stack 3 is pulled over, against which the stretch fingers 14 follow the hood side walls when the lifting frame 5 is lowered pull down so that the side walls of the hood are stretched vertically at the same time, that is, provided with a longitudinal stretch.
  • the rollers 16.1 and 16.2 or 16.4 and 16.5 lying outside the reference plane 20 are arranged such that the hood 2 is the outermost stretch rollers 16.1 and 16.5 is affected, but is not redirected by them.
  • the stretch rollers 16 are preferably arranged in such a way that a certain deflection of the film takes place on each stretch roller 16, i.e.
  • a first tangent T1 applied from the outside to the outside of two adjacent stretch rollers 16.1, 16.2 the side facing the stretch rollers 16 in a top view with a second tangent T2 includes an angle ⁇ of less than 180 °, which from the outside from the outside of one of these two stretch rollers (here the stretch roller 16.2) to the outside of the other adjacent stretch roller 16.3 is laid.
  • the critical angle at which the stretch rollers are still effective is clearly 180 °. This angle is preferably smaller than the critical angle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
EP97710008A 1996-03-28 1997-03-27 Dispositif d'étirage pour étirer une coiffe étirable Expired - Lifetime EP0798214B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19612372 1996-03-28
DE19612372A DE19612372C2 (de) 1996-03-28 1996-03-28 Stretcheinrichtung zum Stretchen einer Stretchfolienhaube

Publications (2)

Publication Number Publication Date
EP0798214A1 true EP0798214A1 (fr) 1997-10-01
EP0798214B1 EP0798214B1 (fr) 2002-10-30

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EP97710008A Expired - Lifetime EP0798214B1 (fr) 1996-03-28 1997-03-27 Dispositif d'étirage pour étirer une coiffe étirable

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EP (1) EP0798214B1 (fr)
DE (2) DE19612372C2 (fr)
DK (1) DK0798214T3 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19819488A1 (de) * 1998-04-30 1999-11-04 Moellers Maschf Gmbh Vorrichtung zum Umhüllen eines Stapels
EP1275582A1 (fr) * 2001-07-11 2003-01-15 Maschinenfabrik Möllers GmbH Appareil pour envelopper une pile de marchandises avec une housse de film étirable
EP1331168A1 (fr) * 2002-01-28 2003-07-30 Thimon Procédé et dispositif de mise en place d'une gaine étirable sur une charge palettisée
KR101689140B1 (ko) * 2016-05-18 2016-12-26 세왕오토팩 주식회사 후드필름 확장형 자동 포장장치
CN112960448A (zh) * 2021-01-26 2021-06-15 黄山源点新材料科技有限公司 一种用于冷拉伸套膜机的卷膜拉膜装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
HUE027052T2 (en) 2010-08-26 2016-08-29 Mollers North America Inc Corner column application system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3918311A1 (de) * 1988-06-03 1989-12-07 Beumer Maschf Bernhard Verfahren und vorrichtung zum umhuellen von stueckgut, insbesondere stueckgutstapeln, mit einer stretchfolienhaube

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3707877A1 (de) * 1987-03-11 1988-09-22 Lachenmeier Kurt Aps Verfahren und vorrichtung zum verpacken von gegenstaenden mit einer bahnfoermigen kunststoffolie
DE9006374U1 (fr) * 1990-06-06 1990-09-13 Bernhard Beumer Maschinenfabrik Kg, 4720 Beckum, De

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3918311A1 (de) * 1988-06-03 1989-12-07 Beumer Maschf Bernhard Verfahren und vorrichtung zum umhuellen von stueckgut, insbesondere stueckgutstapeln, mit einer stretchfolienhaube

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19819488A1 (de) * 1998-04-30 1999-11-04 Moellers Maschf Gmbh Vorrichtung zum Umhüllen eines Stapels
EP1275582A1 (fr) * 2001-07-11 2003-01-15 Maschinenfabrik Möllers GmbH Appareil pour envelopper une pile de marchandises avec une housse de film étirable
EP1331168A1 (fr) * 2002-01-28 2003-07-30 Thimon Procédé et dispositif de mise en place d'une gaine étirable sur une charge palettisée
FR2835236A1 (fr) * 2002-01-28 2003-08-01 Thimon Procede et dispositif de mise en place d'une gaine etirable sur une charge palettisee
KR101689140B1 (ko) * 2016-05-18 2016-12-26 세왕오토팩 주식회사 후드필름 확장형 자동 포장장치
CN112960448A (zh) * 2021-01-26 2021-06-15 黄山源点新材料科技有限公司 一种用于冷拉伸套膜机的卷膜拉膜装置
CN112960448B (zh) * 2021-01-26 2021-10-12 黄山源点新材料科技有限公司 一种用于冷拉伸套膜机的卷膜拉膜装置

Also Published As

Publication number Publication date
EP0798214B1 (fr) 2002-10-30
DE19612372A1 (de) 1997-10-02
DE19612372C2 (de) 2000-09-21
DE59708590D1 (de) 2002-12-05
DK0798214T3 (da) 2003-03-03

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