EP3105124B1 - Umwicklungsvorrichtung mit streckfolie mit verbesserter haltevorrichtung - Google Patents

Umwicklungsvorrichtung mit streckfolie mit verbesserter haltevorrichtung Download PDF

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Publication number
EP3105124B1
EP3105124B1 EP15706711.7A EP15706711A EP3105124B1 EP 3105124 B1 EP3105124 B1 EP 3105124B1 EP 15706711 A EP15706711 A EP 15706711A EP 3105124 B1 EP3105124 B1 EP 3105124B1
Authority
EP
European Patent Office
Prior art keywords
film
reel
wrapping
item
line
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.)
Active
Application number
EP15706711.7A
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English (en)
French (fr)
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EP3105124A1 (de
Inventor
Davide CORBERI
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.)
Krones AG
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Krones AG
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Filing date
Publication date
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Publication of EP3105124A1 publication Critical patent/EP3105124A1/de
Application granted granted Critical
Publication of EP3105124B1 publication Critical patent/EP3105124B1/de
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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
    • B65B45/00—Apparatus or devices for supporting or holding wrappers during wrapping operation
    • 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
    • B65B2011/002—Prestretching mechanism in wrapping machines
    • 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
    • B65B2210/00—Specific aspects of the packaging machine
    • B65B2210/14—Details of wrapping machines with web dispensers for application of a continuous web in layers onto the articles
    • B65B2210/18—Details of wrapping machines with web dispensers for application of a continuous web in layers onto the articles the web dispenser being mounted on a rotary ring

Definitions

  • the present invention relates to a wrapping apparatus of individual items by means of a thin film of stretchable plastic material.
  • individual items may of course consist of a plurality of smaller units (boxes, bags, bottles, ....) joined together.
  • the invention relates to an apparatus for the wrapping with stretchable plastic film with an improved holding device.
  • packaging of items can be done by wrapping said items with a winding of thin plastic film.
  • this last technique is used on machines which wind the items to be packaged with one or more coils of stretchable film, preferably pre-stretched.
  • the winding occurs defining a relative rotation of a reel of plastic film around the item to be wrapped, establishing a relative movement between the reel and the item along a movement axis for determining winding coils distributed on a certain length.
  • the winding may occur according to a vertical axis (for example in conventional pallet wrappers), along which the load to be wrapped is arranged standing, or according to a horizontal axis, along which the items to be wrapped are caused to move forward.
  • each item is fed to the wrapping station along a conveyor belt or a roller conveyor, halted in this station, then it is wound by the film and then caused to continue on the conveyor belt of the wrapping line.
  • a reel-holding carriage which is caused to move along a circular line, arranged in the wrapping station according to a plane oriented perpendicularly to the supply line of the items and which horizontally encircles the conveyor belt.
  • the item is supported exclusively on overhanging guiding means (typically a shelf and any lateral containment rails) which connect the supply portion of the conveyor belt with a moving-away portion.
  • overhanging guiding means typically a shelf and any lateral containment rails
  • these guiding means are shaped and structured so as to favor the removal of the wrapped item.
  • Critical steps of this wrapping process are the initial and final ones, respectively, in which the film must be fastened to the item and then it must be severed to present it again to the subsequent item.
  • it is typically resorted to a retaining and cutting gripper, conventionally arranged below the overhanging guiding means, mounted moving in a longitudinal direction to the rotation axis of the reel-holding carrier.
  • the rectilinear gripper with retaining axis arranged horizontally and aligned to the rotation axis of the film reel, has two cooperating jaws apt to retain a film edge and to also perform, in a position slightly downstream of the retaining line, a cut in the film.
  • the initial end edge of the film is retained by the gripper - stationary in a fixed position - until the forming of at least part of a first film coil around the item to be wrapped, as the reel is displaced in rotation on the reel-holding carriage. In this movement, the film is partly wound on the item and tends to naturally adhere thereto, abutting in tension on the corners.
  • this film rope is the result of an essential step for ensuring that the initial end of film is not released prematurely, on the other hand, however, it makes up a lateral appendix of the wrapping, which disturbs the aesthetics and the functionality of the wrapping.
  • a temporary retaining device apt to retain, by simple resting, the initial film edge to the item to be wrapped.
  • This device supplements the action of the gripper and allows to disengage the gripper in useful time, without it dragging with it the film, despite maintaining the initial edge adherent to the item for the time necessary to complete at least one coil.
  • This temporary retaining device is in the form of a pressure rod, which rests outside the plastic film, pushing it against the item, so as to retain it in position.
  • the shape of the provisional retaining device is such that it can then be taken off the coils, without leaving trace in the wrapping.
  • This handling control is complex and a possible source of adjustment and control problems.
  • EP0713828 further discloses gripping device relying on suction action to retain an edge of the plastic film far from the item to be packaged. This device is always kept outside the path affected by the plastic film reel and hence is not affected in any manner by the technical problems summarized above, which are specific of a wrapping machine having an horizontal feeding line and a film reel brought in rotation around said line.
  • the problem at the basis of the invention is therefore that of proposing an apparatus and a wrapping procedure as above, which allows to achieve an ongoing winding of stretching film, with the smallest complexity possible in the operation of the temporary retaining device.
  • a wrapping apparatus employing stretching plastic film for items to be wrapped, comprising entry line and exit line, which define a horizontal feeding line, having an enter path to and an exit path from a wrapping station provided with a drive ring apt to bring in rotation a reel of said stretching film around said horizontal feeding line, and a holding gripper apt to temporarily hold an initial edge of said film in a starting step of the rotation of said reel, wherein it is also provided a temporary retaining device of said film comprising a stationary hollow elongated suction member arranged with a longitudinal axis thereof parallel to said exit path and having an inner longitudinal side located so as to end up just opposite an item to be wrapped during the permanence in the wrapping station, and an outer longitudinal side provided with at least an air suction intake.
  • the hollow elongated member has a flattened transversal section and has a single intake in the shape of an elongated slit.
  • a net having small mesh is laid on the inner side of said hollow member, covering said slit.
  • the net can have a mesh of 0,2x0,2 mm and the slit a width of 2 mm.
  • the elongated hollow member is mounted cantilevered on a small support frame fastened upstream of said drive ring.
  • the position of said elongated hollow member, with respect to said feeding line, is adjustable.
  • said elongated hollow member is arranged preferably on the side of the feeding line which is closest to said holding gripper with respect to the movement direction of said reel.
  • a wrapping method for wrapping items employing stretching plastic film comprising moving an item along an horizontal feeding line having entry line and exit line, having an enter path to and an exit path from a wrapping station provided with a drive ring apt to bring in rotation a reel of said stretching film around said horizontal feeding line, driving a holding gripper to temporarily hold an initial edge of said film in a starting step of the rotation of said reel, and further comprising the following steps providing a temporary retaining device of said film comprising a stationary hollow elongated suction member arranged with a longitudinal axis thereof parallel to said exit path and having an inner longitudinal side located just opposite and brushing the item to be wrapped during the permanence in the wrapping station, applying vacuum from an air suction intake provided on an outer longitudinal side of said hollow suction member so as to keep said plastic film adjacent to said outer longitudinal side of the hollow member, releasing said initial edge of film and withdrawing said holding gripper before said reel has completed one single coil of stretching film around said horizontal feeding line.
  • a stretching-film wrapping apparatus comprises an entry line 1a, for example a slide or a roller conveyor along which the items to be wrapped are caused to move forward, a wrapping station W and an exit line 1b, itself in the form of a slide or roller conveyor.
  • the items move from entry line 1a to exit line 1b, crossing wrapping station W, along a straight line or according to a different path.
  • the entry line is arranged at 90° with respect to the axis crossing wrapping station W: the items arrive in the proximity of the wrapping station along a sliding plane and then they are pushed crosswise, through station W, by a pushing device S.
  • shelf 2 projects in a cantilever manner through the wrapping station and ends at a short distance from the moving-away portion of exit line 1b (as clearly detectable in fig. 2 ). Shelf 2 has indeed the function of supporting the item during the winding with the stretching film and, at the same time, of easing the translation thereof towards the moving-away portion of exit line 1b despite the application of coils of plastic wrapping film. In its supporting and guiding function, shelf 2 is preferably aided by one or more upper rails 3, which limit laterally the item during the translation and winding thereof with the film. Overall, shelf 2 with rails 3 will be referred to in the following as guiding means.
  • control ring 4 In wrapping station W a control ring 4 is provided, in a way known per se, rotatably mounted - through a plurality of guiding wheels 4a fastened to a base frame - on a plane perpendicular to the progress direction of the items. With control ring 4, brought in rotation through a suitable motorization (not shown in detail), a carriage 5 is mounted integral, whereon a shaft 6 is installed supporting a reel of stretchable plastic film and a relative pre-stretch assembly.
  • gripper 7 gripping the initial end of film P, which unwinds off the reel.
  • gripper 7 performs the double function of retaining the initial edge of film, as well as of severing it when it must be separated from the remaining film wound on the wrapped item.
  • gripper 7 is suitably shifted, according to ways known per se, to grip again the film stretched between the reel and the wrapped item and thus retain the new initial edge of the subsequent wrapping.
  • gripper 7 In the following no further details on gripper 7 will be provided, since the layout thereof is widely known and, per se, it does not form an object of the present invention.
  • a temporary retaining device of the plastic film is furthermore provided, regardless of gripper 7, arranged in a position meant to be adjacent at a short distance to a surface of an item when it is in the winding station.
  • such a retaining device consists of elongated hollow member 8, preferably flattened, arranged with the longitudinal axis thereof according to the progression axis of the items within wrapping station W.
  • Hollow member 8 shaped as a rod, has an inner side, meant to end up just opposite to the item during the permanence thereof in wrapping station W, and an outer side provided with at least intake means 8a.
  • a single intake means is provided in the shape of a slit 8a elongated in the longitudinal direction of hollow member 8, but it is not ruled out to be able to provide a series of small aligned holes or other.
  • the rectilinear slit has proven the most advantageous one, because it produces a good intake and retaining effect of the film, without causing tearing in the same.
  • the intake means where vacuum is operated through the hollow member 8 are in the shape of a rectilinear slit provided on the inner side with a net having small mesh.
  • a metallic net having a small mesh is laid on the inner side of the hollow member 8 to cover the slit.
  • small it is here meant a mesh having a size smaller then the transversal size of the elongated slit.
  • the net has a mesh of 0,2x0,2 mm and the slit has a width of 2 mm.
  • Figs. 3 and 4 disclose a further embodiment where two parallel lines of narrow slit segments are provided, the slit segments belonging to the two lines being staggered each other.
  • Hollow member 8 is connected at the base thereof to a vacuum intake socket, such as to bring into depression an inner cavity thereof and hence cause an intake flow in correspondence of intake means 8a.
  • the crosswise dimension of elongated hollow member 8 is chosen as compromise between the lesser bulk and an acceptable sizing of the inner cavity, in order not to have a high pressure loss on the intake flow, as well as a suitable resistance of the structural walls.
  • hollow member 8 has a rectangular tubular section, for example of the size 20x10 mm with thickness 1.5 mm.
  • elongated hollow member 8 is mounted cantilevered on a small support frame 9, said frame fastened to the apparatus in the proximity of the base of shelf 2.
  • the temporary retaining device with intake means is steadily mounted - that is, without handling and/or control during operation of the wrapping station - upstream of the wrapping station and projecting cantilever-like in the area affected by the movement of the spool of plastic film.
  • elongated hollow member 8 is installed on the side of the item which is first invested by the plastic film coming from the gripper 7 during the winding movement of the reel.
  • elongated hollow member 8 is installed on the side which is nearest to holding gripper 7 with respect to the movement path of the reel.
  • the reel is always found in a position next to holding gripper 7, typically on one of the two sides (depending on the winding direction) of the item progression line: if this is defined as starting side, elongated hollow member 8 is mounted on this same starting side.
  • the position of temporary retaining device 8 is stable, the size of items to be wrapped being the same, but can be adjusted differently (moving supporting frame 9 with respect to the frame of the apparatus) between one cycle and the other, upon the varying of the dimensions of the items to be wrapped.
  • the inner side of elongated hollow member 8 is found just opposite and brushing against an item during the wrapping, so as to offer the least bulk possible between the item and the film coils which are wound thereon.
  • the item to be wrapped is pushed into the wrapping station, sliding just before the inner side of hollow suction member 8.
  • the initial edge of film is retained, in a manner known per se, by underlying holding gripper 7.
  • Moving carriage 5 is driven into rotation on ring 4 and begins to arrange a coil of plastic film around the item to be wrapped: the film hence adheres to the lower part of shelf 2, to the item and then it rests on the outer side of hollow member 8; due to the depression obtained along slit 8a, the film is retained against hollow member 8; in this step it is already possible to release the grip of the initial edge of film, inserted in gripper 7, and cause said gripper to move backwards so as to exit the area effected by the reel movement. In the meantime the reel winding movement continues, which completes the laying of a first film coil around the item, and so on also the subsequent ones.
  • hollow suction member 8 At the end of the winding, air intake through hollow suction member 8 is interrupted, so that the film is no longer retained on the outer side of the temporary retaining device.
  • the item can thus be pushed forward, on exit line 1b, and the film coils will smoothly come off from retaining device 8 and from guiding means 2 and 3 - longitudinally aligned with the exit path - which, for the purpose, may be coated with a low-friction material. Due to the minimum crosswise bulk of hollow member 8, the coils of plastic film nevertheless remain sufficiently taut on the wrapped package, taking up part of the elastic stretching.
  • the device according to the invention is extremely inexpensive and simple from a construction point of view, because it requires only one air suction line and implies no moving part: thus it may be applied to any winding apparatus, even an already existing one, without having to make significant structural changes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)

Claims (7)

  1. Umwicklungsvorrichtung unter Verwendung von Kunststoffstreckfolie für einzuwickelnde Gegenstände, umfassend eine Eintrittslinie (1a) und eine Austrittslinie (1b), die eine horizontale Zuführungslinie mit einem Eintrittsweg zu und einem Austrittsweg von einer Umwicklungsstation (W) definieren, die mit einem Antriebsring (4) bereitgestellt wird, der geeignet ist, eine Drehung einer Spule (6) von der Streckfolie um die horizontale Zuführungslinie herbeizuführen, und eine Haltegreifvorrichtung (7), die geeignet ist, eine Anfangskante der Folie in einem Startschritt der Drehung der Spule (6) vorübergehend zu halten,
    dadurch gekennzeichnet, dass sie darüber hinaus eine zeitweilige Haltevorrichtung der Folie umfasst, die ein stationäres hohles längliches Saugelement (8) umfasst, das mit einer Längsachse davon parallel zu dem Austrittsweg angeordnet ist, und eine innere Längsseite, die so angeordnet, dass sie genau gegenüber einem während des Verbleibs in der Umwicklungsstation (W) einzuwickelnden Gegenstand endet, und eine äußere Längsseite hat, die mit wenigstens einem Luftansaugeinlass (8a) bereitgestellt wird.
  2. Vorrichtung nach Anspruch 1, wobei das hohle längliche Element einen abgeflachten Querabschnitt und eine Einzelaufnahme (8a) in der Form eines länglichen Schlitzes hat.
  3. Vorrichtung nach Anspruch 2, wobei ein Netz mit kleinen Maschen auf die Innenseite des hohlen Elements (8) gelegt wird, das den Schlitz abdeckt.
  4. Vorrichtung nach Anspruch 1, 2 oder 3, wobei das längliche hohle Element (8) freitragend an einem kleinen Tragrahmen (9) montiert ist, der stromaufwärts von dem Antriebsring (4) befestigt ist.
  5. Vorrichtung nach Anspruch 4, wobei die Position des länglichen hohlen Elements (8) mit Bezug auf die Zuführungslinie einstellbar ist.
  6. Vorrichtung nach Anspruch 4 oder 5, wobei das längliche hohle Element (8) auf der Seite der Zuführungslinie angeordnet ist, die der Haltegreifvorrichtung (7) mit Bezug auf die Bewegungsrichtung der Spule (6) am nächsten ist.
  7. Umwicklungsverfahren zum Umwickeln von Gegenständen unter Verwendung einer Kunststoffstreckfolie, umfassend
    das Bewegen eines Gegenstandes entlang einer horizontalen Zuführungslinie mit einer Eintrittslinie (1a) und einer Austrittslinie (1b) mit einem Eintrittsweg zu und einem Austrittsweg von einer Umwicklungsstation (W), die mit einem Antriebsring (4) bereitgestellt wird, der geeignet ist, eine Drehung einer Spule (6) von der Streckfolie um die horizontale Zuführungslinie herbeizuführen,
    das Antreiben einer Haltegreifvorrichtung (7), um eine Anfangskante der Folie in einem Startschritt der Drehung der Spule (6) vorübergehend zu halten;
    dadurch gekennzeichnet, dass es des Weiteren die folgenden Schritte umfasst,
    Bereitstellen einer zeitweiligen Haltevorrichtung der Folie, die ein stationäres hohles längliches Saugelement (8) umfasst, das mit einer Längsachse davon parallel zu dem Austrittsweg angeordnet ist und eine innere Längsseite hat, die sich genau gegenüber befindet und den einzuwickelnden Gegenstand während des Verbleibs in der Umwicklungsstation (W) bürstet,
    Anwenden von Unterdruck von einem Luftansaugeinlass (8a), der an einer äußeren Längsseite der hohlen Ansaugelements (8) bereitgestellt wird, um so die Kunststofffolie angrenzend an die äußere Längsseite des hohlen Elements (8) zu halten,
    Freigeben der Anfangskante der Folie und Zurückziehen der Haltegreifvorrichtung, bevor die Spule eine einzelne Wicklung aus Streckfolie um die horizontale Zuführungslinie beendet hat.
EP15706711.7A 2014-02-14 2015-02-12 Umwicklungsvorrichtung mit streckfolie mit verbesserter haltevorrichtung Active EP3105124B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20140219 2014-02-14
PCT/EP2015/052922 WO2015121334A1 (en) 2014-02-14 2015-02-12 Wrapping apparatus employing stretching film with improved retaining device

Publications (2)

Publication Number Publication Date
EP3105124A1 EP3105124A1 (de) 2016-12-21
EP3105124B1 true EP3105124B1 (de) 2018-01-31

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EP15706711.7A Active EP3105124B1 (de) 2014-02-14 2015-02-12 Umwicklungsvorrichtung mit streckfolie mit verbesserter haltevorrichtung

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US (1) US20170057673A1 (de)
EP (1) EP3105124B1 (de)
CN (1) CN205906247U (de)
ES (1) ES2660450T3 (de)
WO (1) WO2015121334A1 (de)

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IT201600110622A1 (it) * 2016-11-03 2018-05-03 Area S R L Apparecchiatura di imballaggio a pellicola plastica con bilanciamento dinamico
US20180127122A1 (en) 2016-11-06 2018-05-10 Encore Packaging Llc Automated Box or Object Wrapping
USD827002S1 (en) * 2017-03-03 2018-08-28 Encore Packaging Llc Wrapping apparatus
IT201700075940A1 (it) * 2017-07-06 2019-01-06 Area S R L Sistema di imballaggio a pellicola estensibile e relativo dispositivo di ritegno perfezionato
CN110182397B (zh) * 2019-06-21 2023-12-08 河北工业大学 一种花瓶缠绕打包机
CN112520127A (zh) * 2020-11-26 2021-03-19 王新风 一种纸箱包装用缠绕装置
CN112498785A (zh) * 2020-12-14 2021-03-16 宿松九点科技有限公司 食品包装方法
CN112572864B (zh) * 2021-01-07 2022-08-02 广州洪茂科技有限公司 一种用于保鲜薄膜封装的设备
CN117342054B (zh) * 2023-12-06 2024-04-09 湖南亿铠达新材料科技有限公司 一种夹芯复合板材打包设备

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Also Published As

Publication number Publication date
ES2660450T3 (es) 2018-03-22
CN205906247U (zh) 2017-01-25
EP3105124A1 (de) 2016-12-21
US20170057673A1 (en) 2017-03-02
WO2015121334A1 (en) 2015-08-20

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