EP2586717B1 - Tunnel de rétraction - Google Patents

Tunnel de rétraction Download PDF

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Publication number
EP2586717B1
EP2586717B1 EP20120188287 EP12188287A EP2586717B1 EP 2586717 B1 EP2586717 B1 EP 2586717B1 EP 20120188287 EP20120188287 EP 20120188287 EP 12188287 A EP12188287 A EP 12188287A EP 2586717 B1 EP2586717 B1 EP 2586717B1
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EP
European Patent Office
Prior art keywords
shrink tunnel
transport
recited
parallel
shaft wall
Prior art date
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Application number
EP20120188287
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German (de)
English (en)
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EP2586717A1 (fr
Inventor
Christian Napravnik
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Krones AG
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Krones AG
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Publication of EP2586717A1 publication Critical patent/EP2586717A1/fr
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    • 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
    • B65B53/063—Tunnels

Definitions

  • the present invention relates to a shrink tunnel for shrinking packaging means around a collection of articles according to the features of the preambles of claims 1 and 13.
  • the prior art discloses methods and devices for packaging articles which use a shrink film as outer packaging for the articles.
  • the shrink wrap is generally wrapped around the article assembly as a film blank by means of a wrapping system. This so-called container is transported through a shrink tunnel. In the shrink tunnel, the wrapped articles are covered with shrinkage medium, e.g. warm or hot air, applied, whereby the shrink film contracts, so that it conforms to the article and the finished shrink container is formed.
  • shrinkage medium e.g. warm or hot air
  • the packages are processed in the shrink tunnel in several parallel paths.
  • means for introducing the warm air must also be provided, which inject the shrinkage medium between the articles guided in parallel.
  • shrink tunnels with at least one middle shaft wall are used for the multi-lane processing.
  • This inner shaft wall has nozzle openings on both side walls - the so-called outflow surfaces - so that hot air is injected into both sides of the interior of the shrink tunnel.
  • the known shaft walls are walls with a rectangular cross-sectional area perpendicular to the transport plane and perpendicular to the transport direction and an inner cavity into which the hot air is blown.
  • the shaft walls each have at least one, preferably in the upper region arranged air inlet opening through which the hot air is blown from above into the shaft wall and then flows through the nozzle openings of the outflow into the interior of the shrink tunnel.
  • the shaft walls are each arranged at a small distance above the transport plane for the container.
  • the hot air exits in a downwardly directed jet from the respective nozzle openings of the outflow surfaces.
  • Below the transport level is generally also a hot air generator or similar. arranged. The generated hot air is directed vertically upwards on the underside of the container. This hot air is deflected at the bottom of the shaft wall by a large 90 °, resulting in a largely horizontally oriented hot air flow.
  • DE 102007049441 A1 discloses a shrink tunnel having a plurality of gas supply means which supply the hot gas for shrinking the package.
  • the gas supply devices are designed in particular as shaft walls, each with a gas-tight inner partition wall.
  • the two resulting shafts of each gas supply device each have their own supply port for gaseous medium.
  • the partition is arranged diagonally, whereby the two flow chambers are arranged symmetrically to each other.
  • the shaft walls have nozzle openings through which the hot gas flows uniformly and preferably substantially horizontally, ie parallel to the transport plane, into the interior of the shrinking tunnel.
  • DE 25112011 A1 discloses an oven for industrial purposes and bakeries. This comprises a chamber with two substantially vertical side walls. Hot air is introduced into the oven via outflow openings in spatially separate groups on at least one side wall. The cross section of the inflow channels decreases with increasing height in order to ensure a sufficient overpressure even for the uppermost inflow channels.
  • the document DE 1511562 A1 discloses a shrink tunnel wherein heated air is supplied down into the vicinity of the lower part of the housing or the enclosure of the shrink tunnel.
  • heated air is supplied down into the vicinity of the lower part of the housing or the enclosure of the shrink tunnel.
  • For the shrinkage medium are in the side walls of the Shrink tunnels provided in an upper area of the air duct openings with throttle valves.
  • the flow chamber or air duct tapers downwards. With the help of the throttle in the upper region of the air ducts, a portion of the warm air in this area is introduced into the interior of the shrink tunnel, the remaining air flows further down and is introduced at the bottom of the air duct in the interior of the shrink tunnel.
  • the object of the invention is to produce an advantageous flow direction of the shrinking means, in particular in the bottom region of the containers, in order to avoid the disadvantages of the known arrangements described above.
  • the invention relates to a shrink tunnel for shrinking packaging means around a collection of articles.
  • a shrink tunnel is used to shrink film to filled beverage containers, in particular bottles or the like. shrink.
  • wrap-wrapped product compilations are also referred to as packagings.
  • shrink tunnels are used, for example, to group together on pallets packaged bundles into larger packaging units, shrink labels on articles, or similar.
  • a shrink tunnel comprises at least one transport route, in particular a conveyor belt or the like. for the articles wrapped with the packaging material. Furthermore, the shrink tunnel comprises at least two shaft walls arranged on both sides of the transport route, via which the shrinkage medium is conducted onto the shrink film wrapped around the articles.
  • the shaft walls are arranged on or above the transport plane.
  • the shrinkage medium is produced by means of a blower or the like, for example by means of a hot air blower, and passed from above into the shaft walls.
  • the shaft walls have side surfaces arranged parallel to the transport direction. At least one of the two side surfaces is formed as an outflow surface and comprises air outlets or nozzle openings, through which the shrinkage medium is conducted into the interior of the shrinking tunnel.
  • the shaft walls each comprise two side surfaces arranged parallel to the transport direction, wherein at least one of the side surfaces is designed as an outflow surface.
  • About the at least one outflow surface shrinkage medium is passed into the interior of the shrink tunnel.
  • the arranged parallel to the transport direction side surfaces of the shaft walls and the top and bottom forms the sides of a cross-sectional area of the shaft walls perpendicular to the transport plane and perpendicular to the transport direction.
  • the width of this cross-sectional area tapers downwards, i. the width of the cross-sectional area decreases in the direction of the transport plane.
  • further means for supplying shrinking medium can be provided below the transport path.
  • at least one hot air blower can be provided below the transport path, which blows hot air through the conveyor belt upwards, in particular onto the underside of the packs, etc.
  • the upward-directed hot air flow which flows out via the transport plane, retains its upwardly directed flow direction in the region of the underside of the shaft walls.
  • the shaft walls each comprise at least one outflow surface and / or a closed side surface. These surfaces are at an angle to each other hired. Preferably, these surfaces are set at an angle between 0.5 ° and 10 ° to each other. In a particularly preferred embodiment, the angle is approximately 5 °.
  • the shaft walls are wedge-shaped, wherein the wedge tip points in the direction of the transport plane.
  • wedge is meant a body in which two side surfaces converge at an acute angle.
  • a wedge-shaped shaft wall is understood to mean a shaft wall in which the side surfaces extending parallel to the transport direction and the upper side of the shaft wall each form rectangular cross-sectional surfaces. The side surfaces are arranged at an acute angle to each other, so that seen in the transport direction front and rear side surface of the wedge each have a triangular shape or a trapezoidal shape.
  • both side surfaces are formed as Ausström vom and the cross-sectional area of the wedge-shaped shaft wall is formed as an isosceles triangle, wherein the apex of the angle between the two same legs directed towards the transport plane is arranged on or above this.
  • the apex of the triangle lies on a plane of symmetry for the outflow surfaces, which is aligned perpendicular to the transport plane and parallel to the transport direction.
  • the apex of the triangle is cut off so that the cross-sectional area of the inner shaft wall is formed as an isosceles trapezoid, with the upper and lower edges of the inner shaft wall representing the two parallel sides and with the trapezoid tapering in the direction of the transport plane.
  • the shorter parallel side is thus located directly on or above the transport plane, while the longer parallel side limits the upper side of the shaft wall.
  • it is a laterally arranged outer shaft wall, wherein only the inner surface of the shrink tunnel limiting side surface is designed as a discharge surface.
  • the closed surface is arranged perpendicular to the transport plane, while the outflow surface is inclined at an acute angle to the closed surface.
  • the cross-sectional area of the shaft wall thus forms a right-angled triangle, with the top of the cross-sectional area and the side edge of the closed area enclosing the right angle.
  • this cross-sectional area is formed as a rectangular trapezoid, wherein the top of the cross-sectional area and the side edge of the enclosed surface and the bottom of the cross-sectional area and the side edge of the closed surface in each case include the two right angles.
  • triangles or trapezes are also understood to mean shapes in which the tip or the angle at which the side surfaces of the shaft wall meet, are rounded or otherwise modified in their shape, which is often necessary for production reasons.
  • the outflow surface of a shaft wall is an area that faces the interior of the shrink tunnel and thus the transported containers.
  • the outflow surface and the transport plane enclose an angle of less than 90 ° in the interior of the shrink tunnel.
  • the outflow surface is therefore not arranged perpendicular to the transport plane, but includes with the transport plane at an angle which is formed between 89.5 ° and 80 °. If both sides of the shaft wall arranged parallel to the transport direction are each designed as outflow surfaces, then both are inclined in each case toward the transport plane.
  • the first outflow surface is inclined at an angle between 89.5 ° and 80 ° to the transport plane, while the other outflow surface is inclined at an angle between 90.5 ° and 100 ° counter to the transport plane.
  • the two outflow surfaces are inclined symmetrically to a plane arranged perpendicular to the transport plane.
  • the downwardly tapering shape of the shaft wall causes a modified advantageous air flow.
  • the hot air generated below the transport plane and directed upwards on the containers by the transport plane is - in contrast to the conventionally known state of the art - not or only slightly deflected at the bottom of the shaft wall and thus maintains its upwardly directed flow direction.
  • This is particularly advantageous, as it supports the upward movement of a lower Folienüberlapps, whereby a correct formation of the outer packaging is guaranteed.
  • a vortex formation of the shrinking medium is prevented or reduced, which occurs in the conventionally used shrink tunnels due to the opposite flow directions of the shrinking medium from the bottom region and from the shaft walls.
  • the air flow within the shaft wall itself changes due to the tapering downwards width of the cross-sectional area of the shaft wall.
  • a better uniform distribution of the flow of the shrinking medium from top to bottom ie in the direction of the transport plane.
  • this causes so-called wedge shape, that the air emerging via the Ausstöm Assembly better, especially evenly distributed.
  • the outflow direction can be influenced.
  • the air exits in the lower tapered region at a different exit angle through the nozzle openings.
  • the escaping air is no longer largely directed downwards, but has a more horizontal orientation, which also supports a correct production of the outer packaging.
  • the exit angle at which the shrinkage medium is blown into the interior of the shrink tunnel can be selectively influenced by the selection of suitable directed nozzle openings in the side wall of the shaft wall. It can be provided, which are at least partially attached to the interior of the shrink tunnel facing side of the outflow surface and associated with the corresponding air outlets or nozzle openings. In particular, it can be provided that no air guiding devices are provided in the lower quarter to third of the shaft wall.
  • the air outlets are formed as rows of nozzles, which are aligned in particular parallel to the transport plane and parallel to the transport direction.
  • the spoilers are formed for example by fan plates, each one fan plate is assigned to each nozzle row.
  • the spoiler forms with the outflow at an obtuse angle to the transport plane. Accordingly, the outflow surface in the region of the nozzle opening with the air guiding device forms an acute angle.
  • the hot air which is blown from the nozzle opening into the interior of the shrink tunnel, deflected and thus has a largely upward flow direction. This upward flow direction assists in upward movement of an upper foil flap and thus prevents it from shrinking relatively quickly around the articles thus preventing further air entry between the articles.
  • the louvers do not extend over the entire length of the shrink tunnel.
  • air guiding devices are mounted only on the first half up to 80% of the transport route through the shrink tunnel. In the subsequent end region, no air guiding devices are associated with at least the upper rows of nozzles, so that the outflowing hot air in this area again shows a downwardly directed flow direction. The hitherto largely kept open by the upward hot air upper flap open is now pressed down in the desired manner, so that the packaging process is completed.
  • the cross section of the shaft wall according to the invention and the spoilers thus effect each alone or in combination with each other an advantageous directed guidance of the shrinking medium in the direction of the container.
  • This advantageous air flow is achieved by relatively simple technical changes in construction, whereby the shaft wall according to the invention is simple and inexpensive to produce.
  • the invention thus also relates to a shrink tunnel for shrinking packaging means around an assembly of articles, the shrink tunnel comprising a transport plane on which articles wrapped with packaging material are transported in a transport direction.
  • the shrink tunnel comprises at least two shaft walls arranged on and / or above the transport plane parallel to the transport direction, which each comprise two side surfaces arranged parallel to the transport direction, wherein at least one of the side surfaces is designed as an outflow surface.
  • the shrinkage medium can be conducted into the interior of the shrink tunnel via the at least one outflow surface.
  • the at least one outflow surface has regularly arranged air outlets over the entire height and over the entire length of the shaft wall.
  • at least part of the air outlets are associated with air guiding devices.
  • the louvers are mounted on the interior of the shrink tunnel facing outflow outer surface and associated with the respective air outlets.
  • the air outlets are designed as rows of nozzles.
  • baffles so-called fan plates are used, each one fan plate is assigned to each nozzle row.
  • the air outlets are usually designed as rows of nozzles, in particular parallel to the Transport level and are aligned parallel to the transport direction.
  • the nozzle rows now each a fan plate is assigned so that with the outflow an obtuse angle to the transport plane is formed, ie the outflow includes in the region of the nozzle opening with the spoiler or the fan sheet an acute angle.
  • the hot air is deflected as already described above and thus has a largely upward flow direction. This upward flow direction assists in upward movement of an upper foil flap and thus prevents it from shrinking relatively quickly around the articles thus preventing further air entry between the articles.
  • louvers are preferably also arranged in the lower region of the shaft wall in order to produce in this area an upward orientation of the air blown into the shrink tunnel.
  • This is advantageous since the air flowing out of the lower region of the shaft wall now has largely the same upwardly directed flow direction as the hot air produced below the transport plane and directed upwards by the transport plane onto the container.
  • the upward movement of a lower Folienüberlapps the outer packaging is supported, whereby a correct formation of the outer packaging is guaranteed.
  • vortex formation of the shrinking medium is prevented or reduced, which occurs in the conventionally used shrink tunnels due to the opposite flow directions of the shrinking medium from the bottom region and from the shaft walls.
  • the louvers do not extend over the entire length of the shrink tunnel.
  • This relates in particular to the louvers in the upper region of the shaft wall.
  • air guiding devices are mounted only on the first half up to 80% of the transport route through the shrink tunnel.
  • no air guiding devices are associated with at least the upper rows of nozzles, so that the outflowing hot air in this area again shows a downwardly directed flow direction.
  • the hitherto largely kept open by the upward hot air upper flap of the outer packaging is now pressed in the desired manner down, so that the packaging process can be completed.
  • a better adaptation to the containers to be processed can be further achieved by using adjustable nozzles.
  • adjustable nozzles it is possible to use movable nozzles, nozzles whose opening size can be adjusted, nozzles which can be completely closed, etc.
  • individual nozzles and / or nozzles associated with functional groups can be closed together in a targeted manner or at the same time Areas of the shrink tunnel no hot air supply takes place.
  • the air guiding devices can be exchanged and / or mounted quickly, so that an optimal adaptation of the supply of hot air to the respective product is possible as well. As a result, the energy consumption of the shrink tunnel can be adjusted accordingly, in particular reduced.
  • FIG. 1 shows a schematic view of a shrinking device 1 according to the known prior art.
  • Articles, in particular beverage containers, bottles 6, cans or the like are assembled in groups and wrapped with shrink film 7. These arrangements are also referred to as containers 5.
  • the containers 5 are fed in the transport direction TR on a conveyor belt 10 to a shrink tunnel 2.
  • heating means (not shown) are arranged, which act on the container 5, for example, with hot air, whereby the film 7 shrinks around the bottles 6. After the bundles 5 have left the shrink tunnel 2, they are cooled by cold air 22 arranged above the conveyor belt 10.
  • FIG. 2 shows a cross section through a shrink tunnel 2 with two transport paths 11 for containers (not shown).
  • shaft walls 30, 32 hot air 40 is blown into the interior 34 of the shrink tunnel 2.
  • the outer shaft walls 30 have nozzle openings 35 for the hot air 40 only at their side walls 31 directed towards the interior 34 of the shrinking tunnel 2.
  • the inner shaft wall 32 has nozzle openings 35 for the hot air 40 on both side surfaces 33.
  • means 24 are arranged below the transport path 11, with which the containers are additionally acted upon from below with hot air 41.
  • FIG. 3 and FIG. 4 each show a cross section through the transport plane TE and an inner shaft wall 32 according to the prior art and represent the flow conditions of the shrinking medium.
  • an inner shaft wall 32 In an inner shaft wall 32, both side surfaces extending along the transport direction, as discharge surfaces 33 are formed with nozzle openings 35.
  • the shaft wall 32 is arranged at a small distance above the transport plane TE or the conveyor belt 10.
  • the hot air 40 is from above via an upper manifold 45 into the interior 34 blown the shaft wall 32 and thus exits in a downwardly directed jet from the respective nozzle openings 35.
  • the transport plane TE means 24 for generating an upward hot air flow 41 are arranged below the transport plane TE.
  • the vertically upward directed hot air 41 at the bottom 37 of the shaft wall 32 is deflected by substantially 90 ° and forms a largely horizontally oriented hot air flow 42.
  • FIG. 5 and FIG. 6 each show schematically an embodiment of a shaft wall according to the invention 50a, 60a without distribution channel with a triangular cross-section.
  • the containers (not shown) are moved on the transport plane TE by means of a conveying device, in particular by means of a conveyor belt 10, in the direction of transport TR past the shaft walls 50a, 60a.
  • FIG. 5 1 illustrates an inner shaft wall 50a with two outflow surfaces 52 arranged parallel to the transport direction TR.
  • the outflow surfaces 52 have nozzle openings (not shown) for the shrinkage medium.
  • the top 55 and the two outflow surfaces 52 are each formed as a rectangle.
  • the two outflow surfaces 52 are set at an angle to each other and enclose an angle ⁇ 1 .
  • the tip of the angle ⁇ 1 is directed towards the transport plane TE.
  • the front 56 and back 57 and the cross section of the shaft wall 50a are accordingly formed as an isosceles triangle.
  • a cross-sectional plane in this case, a plane is defined, which spans perpendicular to the transport plane and perpendicular to the transport direction.
  • the angle ⁇ 1 is preferably between 1 ° and 10 °.
  • FIG. 6 shows an outer shaft wall 60a with an arranged parallel to the transport direction outflow 52 and a parallel to the Transport direction arranged closed outer surface 61.
  • the outer surface 61 has no nozzle openings (not shown).
  • the upper side 55, the outer surface 61 and the outflow surface 52 are each formed as a rectangle.
  • the outer surface 61 is arranged perpendicular to the transport plane, while the outflow surface 52 is set at an angle thereto.
  • the outer surface 61 and the Ausström nature 52 include an angle ⁇ 2 , wherein the tip of the angle ⁇ 2 is directed to the transport plane TE out.
  • the angle ⁇ 2 is preferably between 0.5 ° and 5 °.
  • the front 56 and back 57 of the shaft wall 60a are accordingly formed as a right triangle, wherein the top 55 and the outer surface 61 include the right angle ⁇ .
  • FIG. 7 and FIG. 8 each show schematically an embodiment of a shaft wall according to the invention 50b, 60b without distribution channel with a trapezoidal cross-section.
  • FIG. 7 represents an inner shaft wall 50b with two outflow surfaces 52 arranged parallel to the transport direction.
  • the upper side 55, the lower side 54 and the two outflow surfaces 52 of the shaft wall 50b are each formed as a rectangle.
  • the two outflow surfaces 52 are set at an angle to each other and include an angle ⁇ 1.
  • the angle ⁇ 1 is preferably between 1 ° and 10 °.
  • the front 56 and rear 57 and the cross section of the shaft wall 50b are formed as isosceles trapezoid, wherein the upper parallel side Xo is longer than the lower parallel side Xu.
  • FIG. 8 1 shows an outer shaft wall 60b with an outflow surface 52 arranged parallel to the transport direction and a closed outer surface 61 arranged parallel to the transport direction.
  • the upper side 55, the underside 54, the outer surface 61 and the outflow surface 52 are each formed as a rectangle.
  • the outer surface 61 is arranged perpendicular to the transport plane, while the outflow surface 52 is set at an angle thereto.
  • the outer surface 61 and the Ausström nature 52 include an angle ⁇ 2 , the tip of the angle ⁇ 2 is directed to the transport plane TE out.
  • the angle ⁇ 2 is preferably between 0.5 ° and 5 °.
  • the front 56 and back 57 of the shaft wall 60b are formed as a rectangular trapezoid, wherein the upper parallel side Xo is longer than the lower parallel side Xu.
  • FIG. 9 and FIG. 10 each show a cross section through the transport plane TE and an inner shaft wall 50a (see also FIG. 5 ) and represent the flow conditions of the shrinking medium.
  • the shaft wall 50a is suspended arranged above the transport plane TE or the conveyor belt 10.
  • the hot air 40 is blown from above via an upper distributor channel 45 into the interior 34 of the shaft wall 50a and exits in a substantially downward beam from the respective nozzle openings 35 of the outflow surfaces 52. Due to the shape of the shaft wall 50a tapering in the direction of the transport plane TE, the exit angle ⁇ of the hot air 40 changes. In the lower region of the shaft wall 50a, the angle ⁇ 2 between exiting hot air 40 and outflow surface 52 is greater than the exit angle ⁇ 1 in the upper one Shaft wall area 50a.
  • FIG. 11 and FIG. 12 show different perspectives of a shaft wall 50a according to the invention with a triangular cross-section.
  • a distribution channel 45 is arranged, via which the hot air 40 is blown into the interior 34 of the shaft wall 50a.
  • the distribution channel 45 has substantially triangular side surfaces 84 and an orthogonal underside.
  • the upper side of the distribution channel 45 consists of two identical, mirror-symmetrically opposite each other trapezoidal surfaces 85 and a centrally disposed rectangular surface 86th
  • the feed 70 for the shrinkage medium (not shown) is arranged.
  • this is a supply of hot air from a hot air blower or similar.
  • the illustrated construction of the distribution channel 45 leads to a reduction of the maximum height in the region of the feed 70 in the direction of the two ends of the distribution channel 45, where this only has a small height. Due to the described structure of the distribution channel 45, the inflowing shrinkage medium 42 is particularly well and quickly distributed over the entire length of the distribution channel 45 and is introduced from there down into the shaft wall 50a.
  • FIG. 13 shows a further embodiment of an inner shaft wall 50c with distribution channel 45.
  • each air guiding devices 75 are assigned to the nozzles 35 in an upper region of the Ausström vom 52. These are in the detail magnification in FIG. 14 detailed (see also FIG. 9 ).
  • the louvers 75 By the louvers 75, the exit angle ⁇ , in which the hot air from the shaft wall 50c flows into the interior of the shrink tunnel, changed. This is in FIG. 15 and FIG. 16 shown.
  • the nozzles 35 are arranged in particular as nozzle rows in the outflow surfaces 52 and aligned parallel to the transport plane TE and parallel to the transport direction TR.
  • the air guiding devices 75 are formed for example by correspondingly shaped baffles 76, wherein in each case a baffle 76 is associated with a row of nozzles.
  • the outflow surface 52 encloses an acute angle ⁇ in the region of the nozzle opening 35 with the air guiding device 75, 76.
  • the effluent from the nozzles 35 hot air 44 is deflected by the obliquely upward inclination of the louvers 75 upwards. As a result, a desired upward movement of an upper foil flap 14 is supported.
  • the containers 5 composed of several bottles 6 are wrapped with a film web 7, so that opposite side surfaces 15 of the container 5 are largely open.
  • the ends of the film web 7 preferably overlap below the bottles 6.
  • the packages 5 are transported through the shrink tunnel so that the open side surfaces 15 are arranged parallel to the outflow surfaces 52, so that the hot air 40, 44 is also blown between the bottles 6.
  • the upwardly directed hot air 44 in the upper region of the outflow surface 52 assists in upward movement of an upper film flap 14 of the shrink film 7 and thus prevents this upper film flap 14 from shrinking relatively quickly around the bottles 6 and thus further air entry between the bottles 6 prevented.
  • the air guiding devices 75 only extend over a central partial area of the height Hs of the shaft wall 50c, in particular approximately over the middle third. Furthermore, the louvers 75 do not extend over the entire length Ls of the shaft wall 50c. Instead, the air guiding devices 75 are arranged in the transport direction TR only on the first half to about 80% of the length Ls of the shaft wall 50c. In the rear region of the shaft wall 50 c, the outflowing from the upper nozzle openings 35 Hot air 40 directed downwards. This has the effect that the upper film tabs 14, which are largely kept open in the front region of the transport path by the upward-directed hot air 44, are now pressed down in the desired manner and the packaging process is completed.

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Claims (12)

  1. Tunnel de rétraction (3) destiné à rétracter des moyens d'emballage (7) autour d'un ensemble d'articles (6), dans lequel ledit tunnel de rétraction (3) comprend un plan de transport (TE) sur lequel des articles (6) enveloppés de moyen d'emballage (7) sont transportés dans une direction de transport (TR), comprenant au moins deux parois de puits (50, 60) disposées sur et / ou au-dessus du plan de transport (TE) parallèlement à la direction de transport (TR), lesdites parois de puits (50, 60) comprenant chacune deux surfaces latérales (52, 61) disposées parallèlement à la direction de transport (TR), l'une au moins des surfaces latérales étant réalisée en tant que surface d'échappement (52), et dans lequel on peut faire passer du milieu de rétraction (40) sur ladite au moins une surface d'échappement (52) dans le volume intérieur (34) du tunnel de rétraction (3), les surfaces latérales (52, 61) des parois de puits (50, 60) ainsi que les faces supérieure et inférieure (54, 55) des parois de puits (50, 60) formant les côtés (Xo, Xu) d'une surface de section des parois de puits (50, 60) perpendiculaire au plan de transport (TE) et perpendiculaire à la direction de transport (TR), et la largeur de cette surface de section se rétrécissant vers le plan de transport (TE), caractérisé par le fait que des moyens (24) de génération d'un courant d'air chaud (41) dirigé vers le haut sont disposés au-dessous du plan de transport (TE), le courant d'air chaud (41) qui s'échappe par ledit plan de transport (TE) et est dirigé vers le haut gardant une direction d'écoulement dirigée vers le haut, au niveau de la face inférieure (54) des parois de puits (50, 60).
  2. Tunnel de rétraction (3) selon la revendication 1, dans lequel les parois de puits (50, 60) comprennent chacune au moins une surface d'échappement (52) et / ou une surface latérale (61) fermée qui sont placées l'une par rapport à l'autre à un angle (α1, α2, β1, β2), en particulier ladite au moins une surface d'échappement et / ou ladite surface latérale fermée étant placées l'une par rapport à l'autre à un angle (α1, α2, β1, β2) compris entre 1° est 10°.
  3. Tunnel de rétraction (3) selon la revendication 1 ou 2, dans lequel les parois de puits (50, 60) sont réalisées chacune en forme de coin.
  4. Tunnel de rétraction (3) selon l'une quelconque des revendications précédentes, dans lequel la section des parois de puits (50, 60) perpendiculaire à la direction de transport (TR) est réalisée, au moins en partie, en forme de triangle, un côté du triangle étant disposé parallèlement au plan de transport (TE) et un sommet du triangle étant dirigé vers le plan de transport (TE).
  5. Tunnel de rétraction (3) selon l'une quelconque des revendications précédentes, dans lequel la surface de section des parois de puits (50, 60) de la section perpendiculaire à la direction de transport (TR) et perpendiculaire au plan de transport (TE) est réalisée, au moins en partie, en forme de trapèze, les côtés parallèles (Xo, Xu) du trapèze étant disposés chacun parallèlement au plan de transport (TE) et le côté parallèle (Xu) plus court délimitant la face inférieure (54) des parois de puits (50, 60).
  6. Tunnel de rétraction (3) selon l'une quelconque des revendications précédentes, dans lequel la face supérieure (55) et les deux surfaces latérales (52, 61) des parois de puits (50, 60) parallèles à la direction de transport (TR) sont réalisées respectivement en tant que rectangle.
  7. Tunnel de rétraction (3) selon l'une quelconque des revendications précédentes, dans lequel ladite au moins une surface d'échappement (52) et le plan de transport (TE) dans le volume intérieur (34) du tunnel de rétraction (3) forment entre eux un angle (ξ, ξ*) inférieur à 90°, en particulier un angle (ξ, ξ*) compris entre 89,5° et 80°.
  8. Tunnel de rétraction (3) selon la revendication 1 ou 2, dans lequel les deux surfaces latérales d'au moins une paroi de puits (50) qui sont disposées parallèlement à la direction de transport (TR) sont réalisées chacune comme surface d'échappement (52), et dans lequel les deux surfaces d'échappement (52) sont disposées de façon symétrique par rapport à un plan de symétrie disposé perpendiculairement sur le plan de transport (TE) et parallèlement à la direction de transport (TR), la première surface d'échappement et le plan de transport (TE) formant entre eux un premier angle (ξ) et la deuxième surface d'échappement et le plan de transport (TE) formant entre eux un deuxième angle (ξ*), les deux angles (ξ, ξ*) présentant la même valeur.
  9. Tunnel de rétraction (3) selon l'une quelconque des revendications précédentes, dans lequel la surface d'échappement (52) présente des sorties d'air (35) disposées régulièrement sur l'ensemble de la hauteur (Hs) de la paroi de puits (50, 60) et sur l'ensemble de la longueur (Ls) de la paroi de puits (50, 60), des dispositifs de guidage d'air (75) étant associés à au moins une partie desdites sorties d'air (35).
  10. Tunnel de rétraction (3) selon la revendication 9, dans lequel lesdits dispositifs de guidage d'air (75) sont fixés sur la surface extérieure d'échappement (52) qui montre vers le volume intérieur (34) du tunnel de rétraction (3) et sont associés aux sorties d'air (35) respectives.
  11. Tunnel de rétraction (3) selon la revendication 9, dans lequel des dispositifs de guidage d'air (76) ne associés qu'aux sorties d'air (35) qui sont situées dans une zone centrale et / ou supérieure de la paroi de puits (50, 60).
  12. Tunnel de rétraction (3) selon la revendication 9, dans lequel lesdites sorties d'air (35) sont réalisées comme rangées de buses et dans lequel lesdits dispositifs de guidage d'air (75) sont des tôles en éventail (76), respectivement une tôle en éventail (76) étant associée à respectivement une rangée de buses.
EP20120188287 2011-10-25 2012-10-12 Tunnel de rétraction Active EP2586717B1 (fr)

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DE102011054780A DE102011054780A1 (de) 2011-10-25 2011-10-25 Schrumpftunnel

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EP2586717B1 true EP2586717B1 (fr) 2015-01-07

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Publication number Priority date Publication date Assignee Title
DE102017119145A1 (de) * 2017-08-22 2019-02-28 Krones Aktiengesellschaft Schrumpfvorrichtung und Verfahren zum Ansaugen von Luft aus einem Innenraum einer Schrumpfvorrichtung
FR3090590B1 (fr) * 2018-12-20 2021-06-11 C E R M E X Constructions Etudes Et Rech De Materiels Pour Lemballage Dexpedition Procédé de conditionnement par fardelage de lots de produits, dispositif de chauffage et installation avec un tel dispositif.
DE102020208108A1 (de) 2020-06-30 2021-12-30 Krones Aktiengesellschaft Schrumpftunnel und Verfahren zum Aufschrumpfen von thermoplastischem Verpackungsmaterial

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US3378989A (en) * 1965-02-24 1968-04-23 Doughboy Ind Inc Packaging machinery
AU1413566A (en) * 1966-11-18 1969-03-13 W. R. Grace Australia Packaging
DE2006043A1 (fr) * 1970-02-11 1971-07-08
GB1450336A (en) * 1974-03-18 1976-09-22 Denholm Ltd Andrew Bakery oven
US4597247A (en) * 1985-10-15 1986-07-01 The Mead Corporation Method and apparatus for applying controlled heat to a group of articles disposed within a shrink film wrapper
DE102006036590A1 (de) * 2006-08-04 2008-02-07 Khs Ag Verfahren zum Aufschrumpfen einer Schrumpffolie auf Verpackungen sowie Vorrichtung zum Durchführen des Verfahrens
DE202007018402U1 (de) 2007-10-16 2008-07-10 Krones Ag Schrumpftunnel
CN101157395A (zh) * 2007-10-23 2008-04-09 张家港市德顺机械有限责任公司 膜包收缩装置中的风道结构

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CN103072716A (zh) 2013-05-01
DE102011054780A1 (de) 2013-04-25
CN103072716B (zh) 2015-05-06

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