EP3932814A1 - Tunnel d'emmanchement et procédé permettant d'emmancher une matière d'emballage thermoplastique - Google Patents

Tunnel d'emmanchement et procédé permettant d'emmancher une matière d'emballage thermoplastique Download PDF

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Publication number
EP3932814A1
EP3932814A1 EP21173251.6A EP21173251A EP3932814A1 EP 3932814 A1 EP3932814 A1 EP 3932814A1 EP 21173251 A EP21173251 A EP 21173251A EP 3932814 A1 EP3932814 A1 EP 3932814A1
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EP
European Patent Office
Prior art keywords
openings
profile
shrink tunnel
shrink
shaft wall
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.)
Pending
Application number
EP21173251.6A
Other languages
German (de)
English (en)
Inventor
Peter Haidacher
Marcus KREIS
Marcus Renz
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
Original Assignee
Krones AG
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 Krones AG filed Critical Krones AG
Publication of EP3932814A1 publication Critical patent/EP3932814A1/fr
Pending 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
    • 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 and a method for shrinking on thermoplastic packaging material according to the features of the independent claims.
  • thermoplastic packaging material in the form of a shrink film or the like is often used.
  • a thermoplastic sheet or shrink film is provided, for example, as an endless material on rolls.
  • the shrink film is separated from the continuous material to a suitable length and the film section is arranged around an assembly or group of several articles.
  • the articles wrapped with the packaging material are then passed through a shrinking device and there, in order to shrink the packaging material, a shrinking medium, for example hot air or the like, is applied.
  • the articles wrapped with a thermoplastic packaging material are transported in a transport direction along a transport path between shaft walls arranged on both sides along the transport path.
  • the shaft walls have side walls parallel to the transport route.
  • the side walls of the shaft walls pointing in the direction of the transport path are each designed as outflow surfaces with nozzle openings, through which nozzle openings the shrinking medium is directed into the interior of the shrinking device and in particular in the direction of the article.
  • a corresponding shrink device with shaft walls is for example in the laid-open specification DE 10 2011 054 780 A1 described.
  • the problem with conventionally known shrinking devices is that the shrinking medium is injected into the interior of the shrinking device in a downward orientation, whereby the laterally protruding film flaps in the lower area are prevented from shrinking laterally upwards to form the film eye.
  • one object of the invention can be seen as providing a possibility with which the shrinkage quality in the production of packaging units, in particular shrinkable packs, can be further improved.
  • thermoplastic packaging material which include the features in the independent claims. Further advantageous refinements are described by the subclaims.
  • the shrink tunnel which is provided for shrinking thermoplastic packaging material onto articles and which is suitable has at least one shaft wall extending along a longitudinal direction of the shrink tunnel.
  • the shrink tunnel is preferably used to combine groups of items wrapped with a shrink film to form shrink packs.
  • the shrink tunnel can also be used to attach other thermoplastic packaging material, for example shrink labels and / or shrink sleeves, to individual items.
  • the articles for example beverage containers such as bottles or cans or the like, are combined into article groups or article combinations in a grouping device.
  • These article groups or article combinations are then wrapped in a wrapping device with a thermoplastic packaging material, for example with a flat packaging blank made of a thermoplastic packaging material, which is also referred to as shrink film.
  • the shrink film is wrapped around the article assembly in the wrapping device.
  • thermoplastic packaging material is shrunk onto the items of the compilation when shrinking medium, for example hot air, is supplied, so that the items within the item group are held together to form a packaging unit called a shrink pack .
  • the shrink device comprises a shrink tunnel and a housing surrounding the shrink tunnel with an entrance area and a Entry opening and an exit area and an exit opening for the articles or groups of articles wrapped with the thermoplastic packaging material. Between the inlet opening and the outlet opening there extends at least one transport path for the articles wrapped with thermoplastic packaging material, on which the articles are transported in the transport direction through the shrink tunnel.
  • the transport route is formed in particular by a transport device or a partial area of a transport device which is delimited on both sides by shaft walls.
  • Each of the shaft walls has at least one outflow surface or nozzle surface for shrinking medium directed towards the transport path, which is applied to the articles wrapped with the thermoplastic packaging material via openings formed within the outflow surface.
  • the number of shaft walls defines the number of transport routes formed.
  • so-called outer shaft walls are provided on both sides of the transport path on or above the transport device, each having an outflow surface facing the interior of the shrink tunnel and a closed side surface facing the housing of the shrink tunnel.
  • three shaft walls are arranged on or above the transport device.
  • the two transport routes in the vicinity of the housing of the shrinking device are each delimited by outer shaft walls.
  • an inner shaft wall Arranged in the center or approximately in the middle between the two outer shaft walls is an inner shaft wall, the two essentially vertical side surfaces of which are each designed as outflow surfaces parallel to the transport direction.
  • the middle or inner shaft wall thus in particular feeds shrinking medium to each of the two parallel transport routes, with the application of shrinkage medium to the two parallel transport routes being or being able to be of approximately the same order of magnitude.
  • the outflow surfaces are equipped with first and second openings. It is provided that the first openings are designed for introducing a first volume flow of shrink medium into the shrink tunnel and that the second openings are designed for introducing a second volume flow of shrink medium into the shrink tunnel. There are the first Openings and the second openings are formed at different heights on the shaft wall and the first volume flow is formed less than the second volume flow.
  • the first openings are arranged below the second openings at at least a first height, so that shrinking medium flows in the first lower volume flow from a lower region of the shaft wall into the interior of the shrink tunnel. Furthermore, the second openings are arranged at a second height, which is assigned to an upper region of the shaft wall, so that shrinking medium flows into the interior of the shrink tunnel in the second higher volume flow from a region of the shaft wall above the first openings.
  • the second openings are arranged at at least a second height which is greater than a maximum height of the articles to which the shrinking medium is to be applied within the shrink tunnel.
  • the increased second volume flow of shrinking medium is introduced into an upper process area of the shrink tunnel, which is located above the article guided through the shrink tunnel.
  • the majority of the shrink medium is introduced into the shrink tunnel above the article and only a smaller proportion is inflated directly onto the side of the article.
  • An alternative embodiment can provide that the first openings are arranged above the second openings, so that shrink medium flows in the first lower volume flow from an upper area of the shaft wall into the interior of the shrink tunnel and that shrink medium flows in the second higher volume flow from an area below the shaft wall flows into the interior of the shrink tunnel.
  • the interior of the shrink tunnel is mainly heated by shrinking medium, which is introduced into the shrinking tunnel via openings in the outflow surface, the shrinking medium not being directed towards the articles wrapped with the thermoplastic packaging material.
  • the first openings have a first diameter and the second openings have a second diameter, the first diameter being smaller than the second diameter. Because of the larger second diameter more shrink medium can pass through, the second volume flow is increased compared to the first volume flow.
  • the outflow surface has at least one first profile with first openings, at least in regions, and that the outflow surface furthermore has at least one second profile with second openings, at least in regions.
  • the at least one first profile and / or the at least one second profile preferably each extend parallel to the longitudinal direction of the shrink tunnel and are also aligned parallel to one another.
  • first and second profiles extend in an upward or downward direction with respect to the longitudinal direction of the shrink tunnel.
  • first and second profiles are preferably aligned parallel to one another.
  • first profiles have a first width in relation to the height of the shaft wall and that the second profiles have a second width in relation to the height of the shaft wall.
  • the first and the second width can be the same or different.
  • an area of the outflow surface without openings is formed between at least one first profile and at least one second profile.
  • the closed area of the outflow surface preferably has a width that is greater than or equal to at least one and a half times (factor 1.5) the first width of the first profile or the second width of the second profile.
  • openings for the exit of the shrinking medium from the shaft wall are only formed in the area of a profile, while no openings are formed on the outflow surface in areas without a profile in between.
  • At least one first profile and / or at least one second profile is / are formed as a recess in the outflow surface opposite the transport path. Furthermore or alternatively it can be provided that at least one first profiling and / or at least one second profiling is / are designed as an increase in the outflow area relative to the transport path. According to one embodiment, all profiling can be one
  • the shaft wall can be designed as an elevation or as a depression of the outflow surface opposite the transport path.
  • Another embodiment, on the other hand, can provide that part of the profiles is or are designed as an elevation and part of the profiles as a depression.
  • first profilings and / or second profilings are provided in each case, then these do not have to be designed in the same way.
  • the designation first profiles and second profiles in connection with the present invention relates less to the specific embodiment of the profiles, but to the arrangement of first openings or second openings within the respective profiles.
  • the at least one first profile and / or at least one second profile is / are preferably configured such that they each have at least one first profile surface that has a downward incline in relation to the outflow surface and in the direction of the transport path.
  • the at least one first profile and / or the at least one second profile each have / have at least one second profile surface which has an upward incline in relation to the outflow surface and in the direction of the transport path.
  • the openings are preferably each assigned to the downwardly inclined profile surface, so that the shrinking medium emerging from the openings has a flow direction with an upward flow component.
  • At least one first profiling is designed as a recess in the outflow surface, the profile surface sloping downward in relation to the outflow surface and in the direction of the transport path being equipped with first openings and the profile surface being provided with first openings in relation to the outflow surface and in the direction of the transport path the sloping profile surface has no openings.
  • At least one first profiling is designed as an increase in the outflow surface, the profile surface sloping downward in relation to the outflow surface and in the direction of the transport path being equipped with first openings and the in relation to the outflow surface and in the direction of the transport path upward sloping profile surface has no openings.
  • the at least one second profiling it can be provided that it is designed as a recess in the outflow surface, the profile surface sloping downward in relation to the outflow surface and in the direction of the transport path being equipped with second openings and the profiled surface being provided with second openings in relation to the outflow surface and in The upward sloping profile surface has no openings in the direction of the transport path.
  • An alternative embodiment can provide that at least one second profiling is designed as an increase in the outflow surface, the profile surface sloping downward in relation to the outflow surface and in the direction of the transport path being equipped with second openings and in which the in relation to the outflow surface and in the direction of the transport path upward sloping profile surface has no openings.
  • the at least one first profile and / or the at least one second profile can each be designed as a V-shape or as a trapezoidal shape opposite the outflow surface with correspondingly inclined profile surfaces. Further profiles with correspondingly inclined profile surfaces can also be used advantageously.
  • the method for shrinking thermoplastic packaging material onto articles which can in particular be carried out in a previously described shrink tunnel, is distinguished by the fact that a volume flow of the shrinking medium is different in strength at different heights over the transport path.
  • a proportion of about fifty percent by volume or more of shrinking medium is introduced into the interior of the shrink tunnel, since this leads to favorable shrinking results.
  • the shrinking medium is preferably introduced into the interior of the shrinking tunnel at a height which is above a maximum height of the articles to which shrinking medium is to be applied within the shrinking tunnel.
  • the shrinking result if more than two thirds of shrinking medium is introduced into the interior of the shrink tunnel in the upper third of the shaft wall.
  • the shrink medium is preferably introduced into the interior of the shrink tunnel at a height which is above a maximum height of the articles to which shrink medium is to be applied within the shrink tunnel.
  • the side wall designed as the outflow surface of the shaft wall is formed by a sheet metal that has profiles in the form of angled V-shaped embossments at the heights corresponding to the articles wrapped with packaging material.
  • the tip of the V extends away from the transport path of the articles, so that the lower profile surface has a downward inclination towards the transport path.
  • first openings are arranged, which serve in particular as air nozzles and from which the shrinking medium emerges in an upwardly inclined direction of flow and flows in the direction of the article wrapped with packaging material.
  • the sheet metal has a plurality of such profiles, which are formed and arranged parallel to one another at different heights.
  • an additional row of second openings is provided in the upper area of the shaft wall, through which the interior of the shrink tunnel can also be supplied with shrinking medium, in particular warm process pleasure, whereby the articles wrapped with packaging material are indirectly exposed to shrinking medium from above.
  • This additional row with second openings is preferably arranged at a height of the shaft wall which is located above the articles guided through the shrink tunnel.
  • the upward flow of the shrinking medium out of the first openings at a corresponding height in relation to the article can ensure a more homogeneous shrinking process of the thermoplastic packaging material enveloping the article.
  • an upper film flap of the packaging material is kept open for a relatively long time before it is shrunk onto the article.
  • the shrink medium gets between the articles and heats the packaging material enveloping the articles from the inside. This causes the packaging material to shrink from the center outwards.
  • shrinking of a lower protruding area of packaging material in an upward direction is supported by shrinking medium, which emerges from the shaft wall in an upwardly directed flow direction in a lower area of the shaft wall.
  • the additional row of second openings in the upper area of the shaft wall supplies the upper process space of the shrink tunnel with warm process air or shrink medium. This enables improved heating of the packaging material in the upper middle area.
  • the first volume flow of shrinking medium introduced laterally via the first openings, through which the shrinking medium is sprayed directly onto the articles wrapped with packaging material can be lower, which also has a positive effect on the shrinking result due to a more homogeneous shrinking process.
  • An alternative embodiment can provide that means for generating a pressure difference are assigned to the first and second openings in order to generate the different volume flows.
  • the first and second openings can have the same cross section in this case.
  • throttle valves for regulating the volume flow are assigned to the lower first openings.
  • a cover strip can be provided with which, for example, the opening size of openings arranged in a row parallel to the longitudinal extent of the shaft wall can be partially covered and thus reduced. Further regulation options known to the person skilled in the art should also be included.
  • the shrinking medium is introduced into the shaft wall via a distribution channel arranged at the top, for example.
  • a volume flow exiting from an opening in an upper area of the shaft wall is less than a volume flow from an opening below, which opening below assumes the same position in relation to the transport path.
  • Another embodiment can provide that a first volume flow from a first opening is less than a second volume flow from a second opening, which second opening has at least the same distance or a greater distance from a connection to shrinking medium via which connection shrinking medium is introduced into the shaft wall .
  • the Fig. 1 shows a schematic view of a shrinking device 1, which is equipped with shaft walls, as described below in connection with the Figures 2 to 10 to be discribed.
  • Several articles 2, in particular beverage containers such as bottles 3, cans or the like, are grouped, ie put together in article groups 15 and wrapped with a thermoplastic packaging material 4, in particular with shrink film 5.
  • the articles 2 wrapped with shrink film 5 are fed in the transport direction TR on a conveyor 6, for example a suitable conveyor belt 7, to a shrink tunnel 8 of the shrinking device 1.
  • the shrink tunnel 8 there is at least one shaft wall (cf. Figures 2 to 10 ), which extends along a longitudinal direction of the shrink tunnel 8.
  • a shrinking medium for example hot air, is applied to the articles 2 wrapped with shrink film 5 via the at least one shaft wall, whereby the shrink film 5 shrinks around the article 2, whereby sales units 9 are formed in the form of shrink packs 10.
  • the shrink packs 10 After the shrink packs 10 have left the shrink tunnel 8, they are preferably acted upon by blowers 11 arranged above the conveyor belt 7 with cold air 12 and thereby cooled.
  • the shrink packs 10 can then be fed to further handling. For example, a plurality of shrink packs 10 are put together in a layer formation module to form palletizable layers, which palletizable layers are then stacked one on top of the other in a palletizing module on pallets to form storage or transport units.
  • the articles 2 have a height h2 which essentially corresponds to a height h15 of the shrink film 5 wrapped article groups 15.
  • the number and design of the shaft walls within the shrink tunnel 8 depends in particular on whether the article groups 15 are transported through the shrink tunnel 8 in a single row or in multiple rows.
  • the article groups 15 are guided on the transport path formed by the conveyor belt 7 between two so-called outer shaft walls arranged on both sides of the transport path.
  • These outer shaft walls each have openings on the side walls directed towards the transport path, via which the shrink medium is introduced into the interior of the shrink tunnel 8.
  • the side walls that are not oriented towards the transport path are designed as closed side surfaces.
  • each transport route is limited by an outer shaft wall and an inner shaft wall, with a side wall of the inner shaft wall parallel to the longitudinal direction of the shrink tunnel facing one of the two transport routes.
  • both side walls aligned in the longitudinal direction of the shrink tunnel 8 thus have openings via which the shrink medium is introduced into the interior of the shrink tunnel 8.
  • further means can be arranged below the transport path TS formed by the conveyor belt 7 in order to be able to apply the shrinking medium to the articles 2 wrapped with shrink film 5 from below.
  • FIGS. 2 to 7 show various perspective representations of an outer shaft wall 20 Fig. 2 in particular a view from the front
  • Fig. 3 shows a view from above into the outer shaft wall 20
  • Fig. 4 shows a plan view of the inner side wall 21 directed towards the transport path
  • Fig. 5 shows a plan view of the outer side wall 22 facing away from the transport path.
  • FIGS Fig. 8 shows a cross section AA through an outer shaft wall (cf. also Fig. 5 ).
  • the outer side wall 22 has no corresponding openings, but is preferably designed as a closed delimitation or surface.
  • First openings 24 are arranged at different heights h24-1 to h24-4 on the inner side surface 21 and for introducing a first volume flow of shrink medium into the shrink tunnel 8 (cf. Fig. 1 ), while second openings 25 are arranged at a height h25 on the inner side surface 21 and for Introducing a second volume flow of shrink medium into the shrink tunnel 8 (cf. Fig. 1 ) are trained. It is provided that the first volume flow is designed to be lower than the second volume flow.
  • embodiments can also be advantageous in which the first openings 24 are arranged above the second openings 25, so that the second higher volume flow of shrinking medium is in a lower area the shaft wall 20 flows out of this and the first lower volume flow, on the other hand, is generated in an upper region of the shaft wall 20.
  • the different volume flows are achieved in particular in that the first openings 24 have a smaller diameter than the second openings 25.
  • the first openings 24 are formed in a lower area of the shaft wall, in particular at heights h24-1 to h24-4, which are preferably at least slightly less than the height h15 of the article group 15 wrapped with shrink film 5, which are used to form a shrink pack 10 through the shrink tunnel 8 according to Fig. 1 to be led.
  • the shrinking medium emerging from the first openings 24 is thus guided directly against the articles wrapped with packaging material.
  • the second openings 25 are preferably arranged at a height h25 which is assigned to an upper region of the inner side wall 23, in particular the height h25 being above the height h15 of the article groups 15 wrapped with shrink film 5 to be exposed to shrinking medium within the shrink tunnel 8 is located. While the shrink medium emerging from the first openings 24 is directed towards the article groups 15 wrapped with shrink film 5, the shrink medium emerging from the second openings 25 reaches the interior of the shrink tunnel 8 above the article groups 15 wrapped with shrink film 5.
  • first openings 24 and the second openings 25 Due to the selected arrangement and design of the first openings 24 and the second openings 25, a large part of the volume flow of shrinking medium is introduced into an area of the shrink tunnel 8 which is located above the article groups 15 wrapped with shrink film 5.
  • the additional second openings 25 in the upper region of the shaft wall 20 provide additional heating of the upper process space is made possible by the shrinking medium introduced into the shrinking tunnel 8 via the second openings 25.
  • the closed side wall 22 can also have profilings in the illustrated embodiment, these are not equipped with corresponding openings.
  • the closed side wall 22 can also be formed, for example, by a non-profiled sheet metal or the like.
  • Fig. 9 shows a plan view of an inner shaft wall 30 from above and Fig. 10 shows a cross section through an inner shaft wall 30.
  • an inner shaft wall 30 has two inner side walls 21 with first openings 24 and second openings 25, as has already been described in detail in connection with the outer shaft wall 20, so that reference is made to their description.
  • the Fig. 11 shows a side of an inner side wall 21 of a shaft wall facing the transport route TS in a perspective illustration.
  • This is designed as an outflow surface 23 with first openings 24 and second openings 25 for the shrinking medium SM.
  • the outflow surface 23 has at least one first profile 31 at least in some regions.
  • the first profiling 31 is designed in particular as a recess 32 of the outflow surface 23 opposite the transport path TS and extends along the inner side wall 21 parallel to the transport path TS and thus parallel to the longitudinal direction of the shrink tunnel.
  • first profiles 31 are at different heights h24-1 to h24-4 (cf. Figures 4 and 6th ) is provided on the outflow surface 23.
  • the first profilings 31 preferably have a V-shape 33, each with a profile surface 34 sloping in the direction of the transport path TS or transport surface and a profile surface 35 rising in the direction of the transport path TS or transport surface. It is provided here that the profile surface 34 sloping in the direction of the transport path TS or transport surface is equipped with first openings 24, while the profile surface 35 rising in the direction of the transport path TS or transport surface has no corresponding openings.
  • the arrangement of the first openings 24 in the downwardly inclined profile surface 34 has the effect that the shrink medium SM in an upward direction into the interior of the What flows into the shrink tunnel Figures 10 and 11 is exemplified by arrows.
  • the outflow surface 23 of the inner side wall 21 has at least one second profiling 36 in regions.
  • the second profiling 36 is designed in particular as an elevation 37 of the outflow surface 23 opposite the transport path TS and extends along the inner side wall 21 parallel to the transport path TS and thus parallel to the longitudinal direction of the shrink tunnel and parallel to the first profilings 31.
  • the second profiling 36 assigned to an upper region of the side wall 21.
  • the second profiling 36 is preferably formed at a height which extends above the article to be processed within the shrink tunnel.
  • the second profiling 36 can also preferably have a V-shape 38, each with a profile surface 39 sloping in the direction of the transport path TS or transport surface and a profile surface 40 rising in the direction of the transport path TS or transport surface the profile surface 39 sloping down towards the transport path TS or transport surface is equipped with second openings 25, while the profile surface 40 rising in the direction of the transport path TS or transport surface has no corresponding openings.
  • the arrangement of the second openings 25 in the downwardly inclined profile surface 39 has the effect that the shrink medium SM flows in an upward direction into the interior of the shrink tunnel, which in the Figures 10 and 11 is exemplified by arrows.
  • the second openings 25 have a diameter that is significantly larger than that of the first openings 24.
  • the number of second openings 25 within the second profiling 36 is higher compared to the number of first openings 24 within a first profiling 31. This has the effect that a first volume flow V1 of shrinking medium SM emitted through the first openings 24 is less than one second volume flow V2 delivered through the second openings 24.
  • the volume flow V of the shrinking medium SM released into the interior of the shrink tunnel is designed to be different in strength at different heights over the transport path TS.
  • a first volume flow V1 in a lower region of the shaft walls 20, 30 is weaker than a second volume flow V2 in an upper region of the shaft walls 20, 30.
  • volume in an upper third of the at least one shaft wall 50 % or more of shrink medium SM are introduced into the shrink tunnel. This takes place in particular via the second openings 25.
  • second profiling can also be designed as a recess opposite the outflow surface 23 and / or the first profiling can be configured as a raised portion opposite the outflow surface 23.
  • first openings 24 and / or the second openings 25 can be assigned to the upwardly inclined profile surfaces of the profiles so that the shrinking medium SM is blown into the interior of the shrink tunnel in a downward flow direction.
  • volume flow V in the lower area of the shaft wall 20, 30, in particular the volume flow V directed towards the article groups is higher than the volume flow V exiting the shaft wall 20, 30 in the upper region above the article groups .
  • the Fig. 12 shows a shaft wall 50 consisting of several segments with a distribution channel 51 in a perspective view.
  • a plurality of segments of an inner shaft wall 30 or an outer shaft wall 20 are preferably arranged one behind the other in order to produce a shaft wall 50 of the desired length.
  • the individual segments - in the present case there are four segments of an inner shaft wall 30 or four segments of an outer shaft wall 20 can be laterally separated from one another in a flow-technical manner in a shrinkage-proof manner.
  • the segments are arranged on a distribution channel 51, via which the shrinking medium SM is introduced between the side walls 21, 22 (in the case of outer manhole wall segments) of the segments of the inner manhole wall 30 or the outer manhole wall 20, from where it is then introduced via the first openings 24 and the second openings 25 reaches the interior of the shrink tunnel.
  • FIGS 13 and 14 show the shrinking process within a shrink tunnel 8.
  • an inner transport path for article groups 15 wrapped with shrink film 7 is shown, in which these are in each case between two inner ones Shaft walls 30 are guided through the shrink tunnel 8 via the conveyor 6.
  • the second openings 25 in the upper region of the shaft wall 30 enable additional heating of the upper process space, in particular above the article groups 15 wrapped with shrink film 7.
  • the article groups 15 wrapped with shrink film 7 are acted upon with shrink medium from below via the bottom area and additionally with shrink medium from the side via the shaft walls.
  • the shrinking process of the shrink film starts from the edge of the shrink film and then runs in the direction of the center of the film. When the shrink pack is produced, this can lead to an unsightly design of the film eye.
  • the upper film flap 55 of the shrink film 5 is kept open for a relatively long time by means of the shrink medium SM, which exits the shaft wall 30 in an upward flow direction in the upward flow direction and is marked with a reference symbol (II), before it is applied to the Article 22 shrinks. This supports the shrinking of the shrink film 5 from the center of the film to the outside.
  • the shrink film 5 first shrinks in the central area M and lies firmly against the article 2 from above before the shrink film 5 shrinks in the lateral area, in particular in the area of the film protrusions U.
  • the formation of wrinkles is reduced or completely prevented, and particularly uniform film eyes are formed.
  • the shrinking of the lower film flap 56 of the shrink film 5 in the upward direction is supported by the shrinking medium SM, which emerges from the shaft wall 30 in an upward flow direction in a lower area of the shaft wall 30 and is marked with a reference symbol (III).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)
EP21173251.6A 2020-06-30 2021-05-11 Tunnel d'emmanchement et procédé permettant d'emmancher une matière d'emballage thermoplastique Pending EP3932814A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020208108.5A DE102020208108A1 (de) 2020-06-30 2020-06-30 Schrumpftunnel und Verfahren zum Aufschrumpfen von thermoplastischem Verpackungsmaterial

Publications (1)

Publication Number Publication Date
EP3932814A1 true EP3932814A1 (fr) 2022-01-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP21173251.6A Pending EP3932814A1 (fr) 2020-06-30 2021-05-11 Tunnel d'emmanchement et procédé permettant d'emmancher une matière d'emballage thermoplastique

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EP (1) EP3932814A1 (fr)
CN (1) CN216035531U (fr)
DE (1) DE102020208108A1 (fr)

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EP0538925A1 (fr) * 1991-10-15 1993-04-28 INTERDIBIPACK S.p.A. Four avec refroidissement à air, en particulier pour l'emballage de produits avec un film thermorétrécissable
US6689180B1 (en) * 2002-11-14 2004-02-10 Benison & Co., Ltd. Hot air flow control device of heat-shrinking film packaging machine
DE102011054780A1 (de) 2011-10-25 2013-04-25 Krones Aktiengesellschaft Schrumpftunnel
EP2767477A1 (fr) * 2013-02-14 2014-08-20 Krones Aktiengesellschaft Dispositif de rétractation avec des murs assemblés par des modules
EP2767476A1 (fr) * 2013-02-14 2014-08-20 Krones Aktiengesellschaft Dispositif de rétractation
WO2014127790A1 (fr) * 2013-02-22 2014-08-28 Khs Gmbh Système de tunnel de rétraction et procédé associé permettant de rétracter un film rétractable sur des emballages

Family Cites Families (2)

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Publication number Priority date Publication date Assignee Title
DE19920057A1 (de) 1999-05-03 2000-11-09 Kallfass Gmbh Verfahren und Vorrichtung zur Verpackung von Gegenständen in Schrumpffolie
DE102009044465A1 (de) 2009-11-09 2011-05-12 Krones Ag Schrumpftunnel

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4979314A (en) * 1988-07-13 1990-12-25 Sleever International Company Method of controlling the temperature in a tunnel which is open at both ends, and apparatus for implementing the method
EP0538925A1 (fr) * 1991-10-15 1993-04-28 INTERDIBIPACK S.p.A. Four avec refroidissement à air, en particulier pour l'emballage de produits avec un film thermorétrécissable
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WO2014127790A1 (fr) * 2013-02-22 2014-08-28 Khs Gmbh Système de tunnel de rétraction et procédé associé permettant de rétracter un film rétractable sur des emballages

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