EP0595108B1 - Apparatus with hot air jets to wrap palletized products with a film of thermoretractible plastic material - Google Patents

Apparatus with hot air jets to wrap palletized products with a film of thermoretractible plastic material Download PDF

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Publication number
EP0595108B1
EP0595108B1 EP93116515A EP93116515A EP0595108B1 EP 0595108 B1 EP0595108 B1 EP 0595108B1 EP 93116515 A EP93116515 A EP 93116515A EP 93116515 A EP93116515 A EP 93116515A EP 0595108 B1 EP0595108 B1 EP 0595108B1
Authority
EP
European Patent Office
Prior art keywords
load
film
feeling
generators
slides
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.)
Expired - Lifetime
Application number
EP93116515A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0595108A1 (en
Inventor
Franco Tacchini
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.)
Officina Meccanica Sestese SpA
Original Assignee
Officina Meccanica Sestese SpA
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 Officina Meccanica Sestese SpA filed Critical Officina Meccanica Sestese SpA
Publication of EP0595108A1 publication Critical patent/EP0595108A1/en
Application granted granted Critical
Publication of EP0595108B1 publication Critical patent/EP0595108B1/en
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
    • B65B59/00—Arrangements to enable machines to handle articles of different sizes, to produce packages of different sizes, to vary the contents of packages, to handle different types of packaging material, or to give access for cleaning or maintenance purposes
    • B65B59/02—Arrangements to enable adjustments to be made while the machine is running
    • 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
    • B65B53/00—Shrinking wrappers, containers, or container covers during or after packaging
    • B65B53/02—Shrinking wrappers, containers, or container covers during or after packaging by heat
    • B65B53/06—Shrinking wrappers, containers, or container covers during or after packaging by heat supplied by gases, e.g. hot-air jets
    • B65B53/066—Mobile frames, hoods, posts or the like
    • 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
    • B65B59/00—Arrangements to enable machines to handle articles of different sizes, to produce packages of different sizes, to vary the contents of packages, to handle different types of packaging material, or to give access for cleaning or maintenance purposes
    • B65B59/003—Arrangements to enable adjustments related to the packaging material

Definitions

  • One of said techniques consists in carrying out a true and proper wrapping with several layers of a thin film of stretch material.
  • Said film is in the form of a strap of flexible plastic material resisting to tensile stress, as low-density polyethylene having a thickness of 20/30 ⁇ m.
  • Said film is applied under tension on the palletized load and it sticks thereon by simple mutual adhesion of the single layers.
  • the drawback of such a wrapping is its scarce capability to hold together the load, the fastening action being essentially limited to the transversal direction.
  • the other technique consists in slipping over the palletized load a piece of tubular film of thermoretractible material, as polyethylene having a thickness of 80/120 ⁇ m. Said tubular film is slipped over the load in a loose state and is then tightened, through heat, up to strictly adhering to the load.
  • Machines of this type are known, for example, from DE-A-3826358, EP-A1-0 076 867 or EP-A1-0 395 919.
  • the main drawback of this technique lies in the fact that, in order to cause a sufficient shrinking without risking to damage (burn) the film, it is necessary
  • the main object of the present invention is therefore to realize an apparatus allowing to apply a thermoretractible film over the load in a simple and precise manner, but making use, first of all, of a low-power heat source.
  • a further object of the present invention is to allow making use of a scarcely polluting heat source, for instance obtained by infra-red rays, or by air heated with resistors.
  • the apparatus comprises a plurality of known-type hot air generators G, each comprising a motorfan, heating resistors, and a nozzle distributing hot air jets.
  • the generators G are mounted in sets of three, on parallel longitudinal support slides 1 and 2 positioned on the two opposite lateral sides of the load C, and in sets of two, on parallel transversal slides 3 and 4 positioned on the opposite end sides of the load C.
  • the slides 1 and 2 are slidable - in the direction of arrows F - along horizontal transversal guides (not shown); their movement is controlled by cylinder-piston units 5 which simultaneously move them towards or, respectively, away from the load C.
  • the slides 3 and 4 are in turn slidable - in the direction of arrows F' - along horizontal longitudinal guides (not shown); their movement is equally controlled by cylinder-piston units 6 which simultaneously move them towards or, respectively, away from the load C.
  • the cylinder-piston units 5 and 6 do not control directly the movements of the slides 1, 2, and 3, 4, but through elastic means - for example springs - allowing a certain possibility of horizontal displacement of said slides, for the purpose specified hereinafter. Stop means, provided with position adjustment means, are moreover associated in known manner to the units 5 and 6.
  • An alternative elastic system can be obtained with the same units 5 and 6, by using pneumatic means and regulating the feeding pressure to a sufficiently low extent to allow some oscillation of the piston into the cylinder chamber.
  • the horizontal guides (not shown) supporting the slides 1, 2, 3, 4, are in turn slidable in a vertical direction - arrows F'' in fig. 3 - along vertical guide rods (also not shown).
  • the horizontal guides and vertical guide rods are not illustrated on the drawings, as their structure is within reach of any technician skilled in the art and does not strictly form part of the present invention.
  • Each of said slides 1, 2, 3 and 4 carries - as well as a set of generators G - also a roller 1a, 2a, 3a and, respectively, 4a, mounted freely rotatable about a horizontal axis parallel to the surface of the load C.
  • Said rollers act as feeling members and their surface is provided with a lagging, i.e. an insulating lining, for the purpose specified hereinafter.
  • the rollers are mounted so that a vertical plane tangent to the periphery of the roller, on the side facing the, load C, passes at a short distance - for instance, a distance l of about 30 to 50 mm - from the outlet nozzle G1 of the hot air generator G.
  • the rollers are moreover mounted through position adjustment means, which allow to precisely adjust the distance l according to the type of thermoretractible material and to the power of the heat source.
  • the air - heated to about 350°C in the generator G - reaches the film of thermoretractible plastic material without there being enough time for it to mix with ambient air: this helps to preserve its temperature.
  • the presence of the feeling roller helps to preserve the right temperature, since said roller is positioned just above the nozzle G1 and thus forms a sort of hood to prevent hot air from escaping towards the top.
  • the function of the roller - both as pressure or feeling member, and as hood or barrier to contain the hot air - can also be performed by a bar of semirigid or flexible material, as rubber.
  • thermoretractible film Taking into account the proximity and positioning of the hot air generators, and especially the presence of the cited barrier, it is thus possible to make use of low-power generators - also, in particular, of generators with heating resistors, or of electrically fed generators with infrared rays - being sure that the heat supplied by them will not be dispersed, but will be concentrated on the thermoretractible film, so as to allow it to reach a temperature sufficient to produce the required thermoretraction. It is possible, of course, to use also gas-fired generators, with the advantage that - according to the arrangement of the present invention - sharp-fire burners can be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
EP93116515A 1992-10-28 1993-10-12 Apparatus with hot air jets to wrap palletized products with a film of thermoretractible plastic material Expired - Lifetime EP0595108B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI922463A IT1255924B (it) 1992-10-28 1992-10-28 Apparecchiatura a getti di aria calda, per l'imballaggio di materiale accatastato su pallets con pellicola di materiale plastico termoretraibile.
ITMI922463 1992-10-28

Publications (2)

Publication Number Publication Date
EP0595108A1 EP0595108A1 (en) 1994-05-04
EP0595108B1 true EP0595108B1 (en) 1997-04-23

Family

ID=11364179

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93116515A Expired - Lifetime EP0595108B1 (en) 1992-10-28 1993-10-12 Apparatus with hot air jets to wrap palletized products with a film of thermoretractible plastic material

Country Status (5)

Country Link
EP (1) EP0595108B1 (it)
AT (1) ATE152066T1 (it)
DE (1) DE69310084T2 (it)
ES (1) ES2102573T3 (it)
IT (1) IT1255924B (it)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202005020192U1 (de) 2005-10-24 2006-05-24 MSK-Verpackungs-Systeme Gesellschaft mit beschränkter Haftung Vorrichtung zum Schrumpfen einer um einen, insbesondere palettierten, Gutstapel gelegten Heißschrumpffolie
CN101296847B (zh) * 2005-10-24 2012-05-09 Msk包装系统股份有限公司 用于使围着尤其是用托盘托着的物品堆叠而布设的热收缩薄膜收缩的方法和设备
IT1400702B1 (it) * 2010-06-23 2013-06-28 Marpak Oms Group S R L Apparecchiatura per l'imballaggio di carichi con pellicola termoretraibile, dotata di bruciatori regolabili.
ITMI20112408A1 (it) * 2011-12-28 2013-06-29 Marpak Oms Group S R L Apparecchiatura semplificata per l'imballaggio di carichi con pellicola termoretraibile
CN105253384A (zh) * 2015-11-11 2016-01-20 中银（宁波）电池有限公司 电池塑料包装热收缩设备
DE202016102826U1 (de) 2016-05-27 2016-06-08 Marpak-Oms Group S.R.L. Wärmeschrumpfeinrichtung zur Verpackung mit durch Wärme aufschrumpfbarer Folie, ausgestattet mit in Abschnitte unterteilten Brennern

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK147296C (da) * 1979-03-27 1985-01-14 Lachenmeier Kurt Aps Apparat til varmekrympning af en folie omkring en genstand
DE3826358A1 (de) * 1988-06-02 1989-12-07 Moellers Maschf Gmbh Vorrichtung zum heissschrumpfen einer folie um einen zu verpackenden gegenstand

Also Published As

Publication number Publication date
IT1255924B (it) 1995-11-17
ITMI922463A0 (it) 1992-10-28
DE69310084T2 (de) 1997-10-02
EP0595108A1 (en) 1994-05-04
ITMI922463A1 (it) 1994-04-28
ES2102573T3 (es) 1997-08-01
DE69310084D1 (de) 1997-05-28
ATE152066T1 (de) 1997-05-15

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