WO2007010341A1 - Procédé et système destinés à emballer des charges à l’aide d’un film plastique préalablement étiré - Google Patents

Procédé et système destinés à emballer des charges à l’aide d’un film plastique préalablement étiré Download PDF

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Publication number
WO2007010341A1
WO2007010341A1 PCT/IB2006/001844 IB2006001844W WO2007010341A1 WO 2007010341 A1 WO2007010341 A1 WO 2007010341A1 IB 2006001844 W IB2006001844 W IB 2006001844W WO 2007010341 A1 WO2007010341 A1 WO 2007010341A1
Authority
WO
WIPO (PCT)
Prior art keywords
film
stretching
cylinders
load
pair
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.)
Ceased
Application number
PCT/IB2006/001844
Other languages
English (en)
Inventor
Emilio Murarotto
Davide Balzani
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.)
Bema SRL
Original Assignee
Bema SRL
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 Bema SRL filed Critical Bema SRL
Publication of WO2007010341A1 publication Critical patent/WO2007010341A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
    • 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
    • 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
    • B65B57/00—Automatic control, checking, warning, or safety devices
    • B65B57/02—Automatic control, checking, warning, or safety devices responsive to absence, presence, abnormal feed, or misplacement of binding or wrapping material, containers, or packages
    • B65B57/04—Automatic control, checking, warning, or safety devices responsive to absence, presence, abnormal feed, or misplacement of binding or wrapping material, containers, or packages and operating to control, or to stop, the feed of such material, containers, or packages
    • 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

Definitions

  • This invention refers to a method and system for wrapping loads with a pre- stretched extensible plastic film.
  • One widely used method entails the use of a thin plastic film, typically extensible, that is wound several times around the palletised load, tightly wrapping it.
  • a stabilising covering machines are used equipped with a winding head, carrying a reel supplying plastic film.
  • Said winding head can move vertically, wrapping the plastic film helicoidally on the periphery of the palletised load that turns on a swivel platform, or it can move in a vertical direction with a planetary movement around the palletised load that stays still.
  • the palletised load is wrapped with several layers of film, each comprising one winding of plastic film, until the desired stabilising covering is created.
  • the end piece of plastic film is secured to the side surface, to the covering layer immediately beneath it, to prevent the stabilising covering from unravelling during subsequent handling of the load.
  • this invention refers to a method and system for wrapping loads with an extensible film that passes through a pair of pre-stretching cylinders before being wrapped continuously around a load (relatively big) so as to wrap it, creating a stabilising covering for it.
  • the downstream cylinder with respect to the direction in which the film is being fed, is made to turn at a peripherally higher speed than the upstream cylinder which, thanks to the friction created between their surfaces and the film, elongates the film beyond the elastic limit, pre-stretching it, before it reaches the load to wrap.
  • the systems and methods of known technique do not allow the film to be fully exploited which is achieved close to its breaking point. In fact, if the film breaks completely because of excessive pre-stretching, the system has to be stopped and then started again after someone has removed the piece of film wrapped around the rollers and that did not reach the load. Furthermore, in these cases it is often necessary to start all over again, wrapping the load from scratch.
  • the purpose of this invention is to achieve a method and a system for wrapping loads with a pre-stretched extensible plastic film, working safely with pre- stretching values very close to the theoretical values of the material used and which are well above the pre-stretching values actually applied in the known technique under safe conditions; this will increment the yield of the film with a simple and rational solution.
  • This purpose is reached by a method and system in agreement with claims 1 and
  • FIG. 1 shows a schematic side view of a system for wrapping loads with pre-stretched extensible plastic film in agreement with this invention
  • - figure 2 shows a schematic and simplified plan view of the system of figure 1
  • - figure 3 shows a simplified diagram of managing pre-stretching of the system of figure 1.
  • a system for wrapping loads with pre- stretched extensible plastic film indicated by F, has been generally designated by reference numeral 1.
  • said system 1 comprises, summarily, a winding head
  • the reel 11 supporting a reel 11 supplying the film F.
  • the reel 11 is carried by a robot 12 that, standing on the ground by means of a base 13, moves the winding head 10 in relation to a load 100 placed on a pallet 101 which does not move.
  • the film F unwinds from the winding head 10 which can perform a relative rotational movement around the palletised load 100 and a relative vertical movement to wrap the load 100 helicoidally on its sides, following a pre-established wrapping direction, indicated by A.
  • the palletised load 100 is wrapped with several layers of film, each defined by a winding of the film F, until the desired stabilising covering is created.
  • the film F When the load 100 is wrapped, the film F is cut and separated from the supply reel 11. To improve the wrapping characteristics of the film F, it undergoes preliminary pre-stretching during which it suffers permanent deformation which diminishes its elasticity, giving us a more rigid and stable packaging compared to a film that is not pre-stretched.
  • the head 10 comprises a pair of pre-stretching rollers or cylinders 2,3 between which the film F of extensible plastic material passes.
  • the film F unwinds from the reel 11, adjacent to which is the first of the two pre-stretching cylinders 2,3, that is, the upstream one.
  • said upstream cylinder 2 is mounted between a pair of oscillating arms 21 operated by a jack 20, by means of which its position can be adjusted in relation to the reel 11.
  • the cylinders 2,3 are coated with a substance, rubber or other material;, that exerts a high force of friction on the film F which pre-stretehes in the portion F running from the upstream cylinder 2 to the downstream cylinder 3 that is turning faster.
  • the two cylinders 2,3 are operated by electric motors 25,35, whose speeds are set at a constant ratio so as to ensure a constant degree of pre-stretching, controlled by encoders 27, 37 and managed by a programmable logic unit 60.
  • a presser roller 4 pushed by a jack 40, works against the downstream cylinder 3 preventing the film F from slipping.
  • the film F Before the film F can actually be wrapped around the load 100, as described above and illustrated in figure 1, and after being pre-stretched by the two cylinders 2 and 3, it finally reaches the final idle roller 6, set with a fixed axis, around which the film winds partially and from where it reaches the surface of the load 100.
  • the system 1 comprises means for continuously monitoring the tension of the film F in the portion F' which is between the two pre-stretching cylinders 2 and 3.
  • said tension is kept under control by monitoring the torque moment that rollers 2 and 3 are subject to.
  • this is carried out by means of two ammeters 26, 36 that continuously measure the values of current supplied to each of the cylinder (2 and 3) motors 25, 35, transmitting them to the logic unit 60 which, also receiving the rotation speed values of the cylinders 2 and 3 via the encoders 27, 37, is able to measure the torque moment values of each pre-stretching cylinder 2,3.
  • a rapid drop in film tension is a significant indication of the start of its breaking.
  • a drop in tension in the portion subject to pre- stretching (between the two pre-stretching cylinders 2 and 3) of less than 20- 30% compared to the average value measured is considered critical,, and found in a very limited time interval, for instance 10 -2 seconds.
  • the film When working, the film is pre-stretched in portion F' as it passes through the two pre-stretching cylinders 2 and 3, after which it is wound continuously around the load 100 with the so-called "normal" method.
  • the level of pre- stretching is set initially at a relatively very high value.
  • the logic unit 60 measures a rapid drop in tension in the pre-stretching portion F' it means the film has started to break.
  • the logic unit 60 acts promptly on the cylinders 2 and 3 taking them to the same peripheral speed so as to stop elongation altogether.
  • the logic unit 60 acts immediately on the cylinders 2 and 3 as said before.
  • a "temporary” method is activated immediately for winding the film F as it comes from the downstream cylinder 3, around the stack: this is a temporary and exceptional method that keeps the film winding around the stack to prevent the film breaking altogether; typically, this "temporary” method is carried out by reducing film winding tension compared to the "normal” method, bringing it to values close to zero.
  • the idle roller 5 helps do this, compensating for minor elongation immediately after pre-stretching is cancelled.
  • the speed at which the film F is wrapped around the load 100 can be changed.
  • the speed of the upstream cylinder 2 can be changed back to its previous value, resetting the initial pre-stretching value. Said "temporary" film wrapping method continues until the portion of film about to break is wrapped completely around the surface of the stack.
  • film breakage is monitored by controlling the value of the difference of the torque moments exerted by the two pre-stretching cylinders 2 and 3; this value gives an idea of the tension exerted on the film F and, therefore, if its value remains basically constant over time it indicates the absence of breaks while, at the onset of a break, there is a sudden drop in tension in portion F', shown by a variation of 20-30% of the value of the difference of the torque moments of the cylinders 2 and 3 in a period of time of 10 -2 seconds. It is of course a good idea to check tension regularly so at the very first signs steps can be taken promptly to prevent the break extending excessively along the film.
  • the pre- stretching value set can be reduced or, vice versa, increased if the frequency is thought to be too low.
  • the method and system according to this invention meet the requirements and overcome the problems described in the introductory part of the description with reference to the known technique.
  • the method and system according to the invention means you can work in complete safety, close to the maximum theoretical pre-stretching value of the material employed, even if using films whose characteristics are not uniform along their entire length, usually the cheapest ones. In fact if, during wrapping., there is the start of a break, the method according to the invention lets you act promptly and continue wrapping the load without having to stop the system working.

Landscapes

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

Abstract

La présente invention concerne un procédé destiné à emballer des charges à l’aide d’un film (F) plastique préalablement étiré en se servant d’une paire de cylindres d’étirement préalable (2, 3), le film étant enroulé en continu autour d’une charge (100) afin d’obtenir un emballage. Selon l’invention, le procédé consiste à : a) appliquer une élongation spéciale d’étirement préalable à la portion du film (F) disposée entre ladite paire de cylindres d’étirement préalable (2, 3) ; b) enrouler le film préalablement étiré autour de la charge à l’aide du procédé 'normal1' ; c) surveiller continuellement l’état de la portion du film (F) sujette à l’étirement préalable ; d) cesser d’exercer ledit étirement préalable dès l’observation d’un début de rupture du film (F) ; e) continuer à enrouler le film (F) autour de la charge (100) à l’aide d’un procédé temporaire empêchant le film de se rompre complètement ; f) une fois que la portion du film (F) qui a commencé à se rompre recouvre complètement la paire de cylindres (2, 3), exercer à nouveau l’étirement préalable sur la portion du film (F) disposée entre ladite paire de cylindres (2, 3) ; et, g) une fois que la portion du film qui a commencé à se rompre est suffisamment fixée à la pile, continuer à enrouler le film autour de la charge à l’aide du procédé 'normal'.
PCT/IB2006/001844 2005-07-15 2006-07-04 Procédé et système destinés à emballer des charges à l’aide d’un film plastique préalablement étiré Ceased WO2007010341A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRE20050082 ITRE20050082A1 (it) 2005-07-15 2005-07-15 Metodo per avvolgere carichi con un nastro di plastica pre-stirato e relativo impianto
ITRE2005A000082 2005-07-15

Publications (1)

Publication Number Publication Date
WO2007010341A1 true WO2007010341A1 (fr) 2007-01-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2006/001844 Ceased WO2007010341A1 (fr) 2005-07-15 2006-07-04 Procédé et système destinés à emballer des charges à l’aide d’un film plastique préalablement étiré

Country Status (2)

Country Link
IT (1) ITRE20050082A1 (fr)
WO (1) WO2007010341A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008155129A1 (fr) * 2007-06-21 2008-12-24 Combipac Bv Film pré-étiré
WO2010138282A1 (fr) * 2009-05-29 2010-12-02 Illinois Tool Works Inc. Appareil ou système de distribution de film et d'emballage sous film utilisant une technologie intelligente
US9676507B2 (en) 2008-07-23 2017-06-13 Best Packaging, Inc. Stretch wrapping system and process
EP3941868A4 (fr) * 2019-03-20 2023-03-22 Lantech.Com, Llc Évaluation d'un matériau d'emballage et appareil associé pour détecter des défauts d'un matériau d'emballage
US12037153B2 (en) 2017-09-22 2024-07-16 Lantech.Com, Llc Packaging material quality compensation
US12539992B2 (en) 2022-06-03 2026-02-03 Signode Industrial Group Llc Stretch-wrapping machine with pre-stretch rollers

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4302920A (en) * 1979-11-21 1981-12-01 Lantech Inc. Film web drive stretch wrapping apparatus and process
EP0653352A1 (fr) * 1993-11-17 1995-05-17 Burtech Ab Transmission variable par incréments entre des rouleaux de pré-étirage dans une machine d'emballage à film étirable
US5797240A (en) * 1992-08-25 1998-08-25 Newtec International Method of wrapping loads by means of a stretchable film, a machine and a film for implementing the method
US6185914B1 (en) * 1999-09-10 2001-02-13 1137508 Ontario Ltd. Pre-stretch web dispenser
US20030115840A1 (en) * 2001-12-26 2003-06-26 Illinois Tool Works Inc. Stretch head for facilitating wrapping palletized loads

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4302920A (en) * 1979-11-21 1981-12-01 Lantech Inc. Film web drive stretch wrapping apparatus and process
US4302920B1 (fr) * 1979-11-21 1984-06-19
US5797240A (en) * 1992-08-25 1998-08-25 Newtec International Method of wrapping loads by means of a stretchable film, a machine and a film for implementing the method
EP0653352A1 (fr) * 1993-11-17 1995-05-17 Burtech Ab Transmission variable par incréments entre des rouleaux de pré-étirage dans une machine d'emballage à film étirable
US6185914B1 (en) * 1999-09-10 2001-02-13 1137508 Ontario Ltd. Pre-stretch web dispenser
US20030115840A1 (en) * 2001-12-26 2003-06-26 Illinois Tool Works Inc. Stretch head for facilitating wrapping palletized loads

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008155129A1 (fr) * 2007-06-21 2008-12-24 Combipac Bv Film pré-étiré
BE1017659A3 (nl) * 2007-06-21 2009-03-03 Combipac Bv Voorgerokken rekwikkelfolie.
EP2164770A1 (fr) 2007-06-21 2010-03-24 Combipac BV Film pré-étiré
EP2164770B1 (fr) 2007-06-21 2016-03-30 Combipac BV Film pré-étiré
US9676507B2 (en) 2008-07-23 2017-06-13 Best Packaging, Inc. Stretch wrapping system and process
WO2010138282A1 (fr) * 2009-05-29 2010-12-02 Illinois Tool Works Inc. Appareil ou système de distribution de film et d'emballage sous film utilisant une technologie intelligente
US8453420B2 (en) 2009-05-29 2013-06-04 Illinois Tool Works Inc. Film dispensing and wrapping apparatus or system using smart technology
US12037153B2 (en) 2017-09-22 2024-07-16 Lantech.Com, Llc Packaging material quality compensation
EP3941868A4 (fr) * 2019-03-20 2023-03-22 Lantech.Com, Llc Évaluation d'un matériau d'emballage et appareil associé pour détecter des défauts d'un matériau d'emballage
US12097988B2 (en) 2019-03-20 2024-09-24 Lantech.Com, Llc Packaging material evaluation and apparatus therefor for evaluating simulated flaws
US12116160B2 (en) 2019-03-20 2024-10-15 Lantech.Com, Llc Packaging material evaluation and apparatus therefor for sensing packaging material flaws
US12539992B2 (en) 2022-06-03 2026-02-03 Signode Industrial Group Llc Stretch-wrapping machine with pre-stretch rollers

Also Published As

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