EP2960165A1 - Deep drawing packaging machine and method - Google Patents

Deep drawing packaging machine and method Download PDF

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Publication number
EP2960165A1
EP2960165A1 EP14173592.8A EP14173592A EP2960165A1 EP 2960165 A1 EP2960165 A1 EP 2960165A1 EP 14173592 A EP14173592 A EP 14173592A EP 2960165 A1 EP2960165 A1 EP 2960165A1
Authority
EP
European Patent Office
Prior art keywords
film
station
sealing
skin
covers
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.)
Granted
Application number
EP14173592.8A
Other languages
German (de)
French (fr)
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EP2960165B1 (en
Inventor
Bernhard Grimm
Elmar Ehrmann
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.)
Multivac Sepp Haggenmueller GmbH and Co KG
Original Assignee
Multivac Sepp Haggenmueller GmbH and Co KG
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.)
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Publication date
Application filed by Multivac Sepp Haggenmueller GmbH and Co KG filed Critical Multivac Sepp Haggenmueller GmbH and Co KG
Priority to DK14173592.8T priority Critical patent/DK2960165T3/en
Priority to ES14173592.8T priority patent/ES2644994T3/en
Priority to EP14173592.8A priority patent/EP2960165B1/en
Priority to DE202015002847.0U priority patent/DE202015002847U1/en
Priority to US14/746,613 priority patent/US10384820B2/en
Priority to ES201530735U priority patent/ES1140983Y/en
Publication of EP2960165A1 publication Critical patent/EP2960165A1/en
Application granted granted Critical
Publication of EP2960165B1 publication Critical patent/EP2960165B1/en
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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
    • B65B31/00—Packaging articles or materials under special atmospheric or gaseous conditions; Adding propellants to aerosol containers
    • B65B31/02—Filling, closing, or filling and closing, containers or wrappers in chambers maintained under vacuum or superatmospheric pressure or containing a special atmosphere, e.g. of inert gas
    • B65B31/021—Filling, closing, or filling and closing, containers or wrappers in chambers maintained under vacuum or superatmospheric pressure or containing a special atmosphere, e.g. of inert gas the containers or wrappers being interconnected
    • 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
    • B65B47/00—Apparatus or devices for forming pockets or receptacles in or from sheets, blanks, or webs, comprising essentially a die into which the material is pressed or a folding die through which the material is moved
    • B65B47/02—Apparatus or devices for forming pockets or receptacles in or from sheets, blanks, or webs, comprising essentially a die into which the material is pressed or a folding die through which the material is moved with means for heating the material prior to forming
    • 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
    • B65B47/00—Apparatus or devices for forming pockets or receptacles in or from sheets, blanks, or webs, comprising essentially a die into which the material is pressed or a folding die through which the material is moved
    • B65B47/08—Apparatus or devices for forming pockets or receptacles in or from sheets, blanks, or webs, comprising essentially a die into which the material is pressed or a folding die through which the material is moved by application of fluid pressure
    • B65B47/10—Apparatus or devices for forming pockets or receptacles in or from sheets, blanks, or webs, comprising essentially a die into which the material is pressed or a folding die through which the material is moved by application of fluid pressure by vacuum
    • 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
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/02—Enclosing successive articles, or quantities of material between opposed webs
    • B65B9/04—Enclosing successive articles, or quantities of material between opposed webs one or both webs being formed with pockets for the reception of the articles, or of the quantities of material
    • 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
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/02—Enclosing successive articles, or quantities of material between opposed webs
    • B65B9/04—Enclosing successive articles, or quantities of material between opposed webs one or both webs being formed with pockets for the reception of the articles, or of the quantities of material
    • B65B9/045—Enclosing successive articles, or quantities of material between opposed webs one or both webs being formed with pockets for the reception of the articles, or of the quantities of material for single articles, e.g. tablets

Definitions

  • the invention relates to a thermoforming packaging machine according to the features of claim 1 and to a method according to the features of claim 7.
  • a tray sealing machine for making skin packs having product overhanging a tray edge.
  • the skin film is clamped on the sealing tool upper part and pulled into a dome, before the sealing tool base is moved with the shell and the product to the sealing tool shell.
  • the skin film comes into contact with the product only during the skin process.
  • the EP 2 412 643 A1 shows a thermoforming packaging machine with a Oberfolienformstation to close a projecting vertically above a shell edge product with a shrink film and a trough, without that before the sealing process, the product itself deforms the shrink film by moving it upwards.
  • the upper film forming station located upstream of the sealing station ensures a pre-deformation.
  • a clamp chain arranged on both sides is provided.
  • the WO 2004/000650 A1 shows a thermoforming packaging machine for producing a shrink wrap, wherein both the lower film and the upper film is a shrink film.
  • the thermoforming packaging machine has a bottom film and a top film forming station in which the films are each deep drawn individually prior to sealing, so that a product to be packaged can be packed in the sealing station.
  • the shrinkage effect of the films, in which they apply tightly to the product, is produced in a shrinking device following the thermoforming packaging machine by introducing heat, for example in a hot water bath.
  • a difference between shrink wrapping and skin packaging lies in the fact that in shrink packaging the heat for the shrinking process is supplied only after the packaging process, and in skin packaging the heat is still present in the sealing film in the skin film the sealing process is introduced.
  • a similar shrink wrap packaging machine is in the EP 2 412 643 A1 disclosed.
  • thermoforming packaging machine for producing a skin pack.
  • a skin film as a top film and a trough which has been formed into a lower film and into which a product has been inserted, are transported together into a first forming station and clamped on all sides between a lower mold part and a mold upper part to subsequently vacuum-up the skin film into a dome pull and warm.
  • This process leads to a slight deformation, so that after opening of mold lower part and upper mold part, the skin film during transport together with the trough and the product in a subsequent sealing station exerts no pressure on the product, as long as the product only slightly above the trough to the top survives.
  • the skin film already has an elasticity, which is suitable to be pulled in the sealing station after forming a chamber through a sealing tool base and a sealing tool shell by means of vacuum in a dome, which has a significantly (4x) larger recess than the dome having in the mold shell.
  • the skin film is then heated in the dome to an elevated temperature to then create by vacuum between the skin film and the trough a Skinpackung in which the skin film fits tightly against the product and on the inner surfaces of the trough and thus closes the product airtight. Increased deformation of the skin film in the forming station is not provided.
  • thermoforming packaging machines With a multi-lane and multi-row format, the risk of wrinkling is even further increased.
  • the object of the present invention is to provide a thermoforming packaging machine which reduces the film consumption in the production of a skin package with products which have a product supernatant.
  • thermoforming packaging machine with the features of claim 1 or by a method for operating such a thermoforming packaging machine with the features of claim 7.
  • thermoforming packaging machine comprises a bottom film forming station with a number of n mold cavities, where n is an integer greater than or equal to 2, for forming n wells in a bottom film, and a top film forming station with n evacuable, each surrounded by a clamping surface Domen, the first Height between the clamping surface and a recess, for molding n lids in a top film, which is a skin film.
  • the top film forming station is arranged upstream in a production direction in front of a sealing station, wherein the sealing station is configured to seal the lid with the associated n troughs, wherein the sealing station comprises a sealing tool top, which has n heatable and evacuatable dome with a second height.
  • the domes are configured to abut the top film in the respective dome and to heat to a skin temperature.
  • the first height is at least 80% of the second height.
  • Preforming the skin film in a top film forming station to the first height, which is at least 80% of the second height, provides pressure-free slipping of the covers over the product so that the distance between the product on the well and the well edge is less than 20 mm can be reduced, even if products with a product supernatant of more than 60mm are packed with a skin film.
  • both the consumption of lower film and upper film can be reduced, as well as the machine performance can be increased because during a work cycle in the workstations more packaging can be processed.
  • a Skinverpackung with little distance from product to Muldenrand more appealing than with a large distance At the same time, the space required for such skin packaging in the refrigerated shelves or cabinets can be reduced.
  • the second height is at least 60 mm, in a particularly advantageous embodiment at least 80 mm in order to be able to pack particularly large or over the trough edge upwardly projecting products.
  • the skin temperature is at least 170 ° C to achieve an airtight surface seal between the skin sheet and the trough.
  • an upper film transport device arranged on both sides of the upper film is provided in order to transport the covers from the upper film forming station into the sealing station.
  • the cover can be positioned synchronously with the trough and the product as far as the sealing station, and transverse stresses in the skin foil itself do not lead to wrinkling due to the two-sided holding of the skin foil until it is clamped in the sealing station, which can lead to a lack of airtightness.
  • the mold cavities have a bowl depth and preferably the second height of the domes in the sealing tool upper part is at least 5 times, preferably at least 8 times, the cavity depth. This allows an attractive and volume-reduced skin packaging with a high product on a kind of plate, which is formed by the trough.
  • the n mold cavities in the bottom film forming station each have an opening length along and an opening width transversely to the production direction
  • the n domes in the top film mold top each have a first opening length along and a first opening width transversely to the production direction, wherein the first opening length or The first opening width of the domes is between 80% and 95% of the opening length or the opening width of the mold cavity, respectively, in order that the molded covers, when fed into the sealing station, have larger dimensions than a product to be packaged.
  • the skin film Due to the preforming of lids, the skin film can be quickly applied and heated by means of vacuum due to the small distance to the inner wall of the dome in the sealing tool shell and then to perform the skin process can. This shortens the cycle time of the sealing station and thus further increases overall packaging performance.
  • the lids are formed in the top film forming station such that the lids approach the associated troughs during transport from the top film forming station to the sealing station without exerting any pressure on the products of the associated troughs.
  • the upper film is preferably transported by means of an upper film transport device, for example two staple chains arranged on both sides of the upper film.
  • the first temperature to which the skin film is heated is preferably between 100 ° C and 140 ° C, to cause only a permanent deformation of the skin film to cover.
  • the second temperature to which the skin film is heated is preferably between 170 ° C and 220 ° C to produce the elasticity of the skin film for the subsequent skin process.
  • Fig. 1 1 shows a thermoforming packaging machine 1 according to the invention in a schematic side view and with a production direction R.
  • a production direction R several workstations such as a bottom film forming station 2, a top film forming station 3, a sealing station 4, a cross cutting station 5 and a longitudinal cutting station 6 are provided in succession.
  • a bottom film forming station 2 a top film forming station 3
  • a sealing station 4 a cross cutting station 5 and a longitudinal cutting station 6
  • a longitudinal cutting station 6 are provided in succession.
  • the lower film 7 is heated and two troughs 9, which are arranged one behind the other and thus two-lane (i.e., side by side in the production direction R) with respect to the drawing plane, are formed in the lower film 7.
  • an insertion path 10 which is arranged between the lower film forming station 2 and the sealing station 4
  • products 50 are placed in the wells 9, wherein the products 50 have a height of more than 50 mm.
  • the lid 14 are brought closer to the troughs 9 and the lower film 4 and thereby slipped over the products 50, without exerting pressure on the products 50, as the Cover 14 have a size of the molding, which is greater than the dimension of the products 11.
  • the upper film transporting device 13 for example in the form of two staple chains 13 arranged on both sides of the upper film 11, assumes the function of accurately positioning the covers 14 over or onto the products 50 and is moved synchronously with the staple chain for the lower film 7.
  • the upper film transporting device 13 takes over the function of the lateral holding of the skin film 11 or the cover 14 during the transport movement and within the sealing tool 4.
  • the lids 14 after forming a chamber 15 by a sealing tool upper part 16 and a sealing tool lower part 17 by means of a generated vacuum between the lids 14 and in the Fig. 3a formed domes 18 in the sealing tool upper part 16 to the inner wall of the dome 18 and heated to a skin temperature of, for example, 180 ° C, to have an appropriate for the subsequent skin process elasticity.
  • a skin temperature of, for example, 180 ° C
  • the elastic cover 14 applies both tight to the product 11 and to the trough 9, wherein in this skin process, the skin film 11 and the cover 14 with the trough 9 a flat and produce airtight seal.
  • This package 19 is referred to as a skin pack, since the product 11 located on or in the trough 9 is sealed airtight to the bottom foil 7 or the trough 9 with a foil 11 resting closely on the product 50, similar to a second skin.
  • the two-lane next to each transported packages 19 are isolated by means of the cross-cutting station 5 and the longitudinal cutting station 6 and conveyed out of the thermoforming packaging machine 1 via a conveyor belt 20.
  • the lower film forming station 2 is shown in more detail. It has a mold upper part 21 above the lower film 7, which is designed as a heating plate to heat the lower film 7 before molding to a temperature necessary for it.
  • a movable in the arrow direction mold lower part 22 which is disposed below the lower film 7, has two mold cavities 23, in which the heated lower film 7 is formed by means of vacuum from below and / or compressed air from above into the mold cavity 23 to troughs 9.
  • the trough 9 or the molding trough 23 has a trough depth T oriented perpendicular to the lower foil 7.
  • the trough 9 itself also has a trough edge 25 after the molding process.
  • Fig. 2b shows the mold lower part 22 with the two mold cavities 23 in a plan view.
  • the two mold cavities 23 each have an opening 24 upwards, which in turn have an opening length L extending parallel to the transport direction R and an opening width B extending transversely thereto.
  • the top sheet forming station 3 comprises a top sheet die bottom 26 configured as a heating plate and an upper sheet forming die 27 having two domes 28 and a clamping surface 29 for clamping the skin sheet 11 between the top sheet forming die bottom 26 and the top sheet forming die top 27.
  • the domes 28 have a first height D1, which passes through the planes of the clamping surface 29 and a recess 35 is defined with a maximum distance of an inner wall 30 of the domes 28.
  • Fig. 3b shows a sectional view AA, see Fig. 3 from below onto the clamping surface 29 of the upper film forming tool upper part 27.
  • the two domes 28 each have an opening 28a, which in turn have an opening length L1 extending parallel to the transport direction R1 of the skin film and an opening width B1 extending transversely thereto. These dimensions largely correspond to the corresponding dimensions of the cover 14, since shrinkage effects can occur.
  • Fig. 4 shows the sealing station 4 with closed sealing tool shell 16 and sealing tool base 17, the products 50 are enclosed by the lids 14 and the wells 9 and the lid 14 and the wells 9 circumferentially between the sealing tool upper part 16 and the sealing tool bottom 17 are clamped.
  • the covers 14 are sucked against the inner wall 32 of the mandrel 18 of the sealing tool upper part 16 via a vacuum V applied to the sealing tool upper part 16 and then bear against the inner wall 32.
  • the sealing tool upper part 16 comprises a heater 33, by means of which the cover 14 are heated to the skin temperature.
  • the sealing tool upper part 16 like the upper film mold upper part 27, has two domes 18 with an opening length L2 extending parallel to the production direction R and an opening width B2 extending transversely thereto and a second height D2.
  • FIG. 4b In the bottom view of the dome 18.
  • 31 denotes the opening 18 of each dome 18.
  • All three dimensions L2, B2 and D2 of the dome 18 of the sealing tool shell 16 are compared to the dimensions L1, B1 and D1 of the dome 28 of the upper film mold upper 27 by approx. 5% to 20% bigger.
  • a distance A between two lids 14 following one another in the direction of transport R is advantageous, so that the sealing tool upper part 16 in its closed position, as in Fig. 4 can be moved, without causing a directly upstream of the sealing station 4 located cover 14 is too strongly influenced by a radiation heat of the sealing tool shell 16, even if in this position, the lid 14 is already largely over the product 50 is slipped.
  • Fig. 5 shows the phase in which the cover 14 abut in the domes 18 and by means of the heater 33 to a second temperature, ie the so-called. Skintemperatur, are heated, while the space between the wells 9 and the covers 14 is evacuated by means of vacuum V.
  • Fig. 6 shows the situation after venting the sealing tool shell 16 and the application of the lid 14 and the skin film 11 to the product 50 and the trough.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Vacuum Packaging (AREA)

Abstract

Die Erfindung betrifft eine Tiefziehverpackungsmaschine (1) sowie ein Verfahren zum Herstellen einer Skinverpackung (19), bei dem eine Skinfolie (11) vor einer Siegelstation (4) vorgeformt und in der Siegelstation (4) weiterverformt wird, um sich an ein weit über eine Verpackungsmulde (9) überstehendes Produkt (50) anlegen zu können.The invention relates to a thermoforming packaging machine (1) and to a method for producing a skin package (19), in which a skin film (11) is preformed in front of a sealing station (4) and further deformed in the sealing station (4) in order to reach far beyond Packaging trough (9) projecting product (50) to create.

Description

Die Erfindung bezieht sich auf eine Tiefziehverpackungsmaschine gemäß den Merkmalen des Anspruchs 1 bzw. auf ein Verfahren gemäß den Merkmalen des Anspruchs 7.The invention relates to a thermoforming packaging machine according to the features of claim 1 and to a method according to the features of claim 7.

Aus der DE 102 37 933 A1 ist eine Schalenverschließmaschine bekannt, um Skinpackungen mit über einen Schalenrand überstehendem Produkt herzustellen. Dabei wird die Skinfolie am Siegelwerkzeugoberteil geklemmt und in einen Dom gezogen, bevor das Siegelwerkzeugunterteil mit der Schale und dem Produkt an das Siegelwerkzeugoberteil heranbewegt wird. Die Skinfolie kommt erst während des Skinvorgangs mit dem Produkt in Kontakt.From the DE 102 37 933 A1 For example, a tray sealing machine is known for making skin packs having product overhanging a tray edge. The skin film is clamped on the sealing tool upper part and pulled into a dome, before the sealing tool base is moved with the shell and the product to the sealing tool shell. The skin film comes into contact with the product only during the skin process.

Die EP 2 412 643 A1 zeigt eine Tiefziehverpackungsmaschine mit einer Oberfolienformstation, um ein vertikal über einen Schalenrand überstehendes Produkt mit einer Schrumpffolie und einer Mulde zu verschließen, ohne dass dabei vor dem Siegelprozess das Produkt selbst die Schrumpffolie durch eine Bewegung nach oben verformt. Die der Siegelstation vorgelagerte Oberfolienformstation sorgt für eine Vorverformung. Um die verformte Schrumpffolie während des Transports von der Oberfolienformstation in die Siegelstation seitlich zu halten bzw. zu führen und exakt auf die Mulde zu positionieren, ist eine beidseitig angeordnete Klammerkette vorgesehen.The EP 2 412 643 A1 shows a thermoforming packaging machine with a Oberfolienformstation to close a projecting vertically above a shell edge product with a shrink film and a trough, without that before the sealing process, the product itself deforms the shrink film by moving it upwards. The upper film forming station located upstream of the sealing station ensures a pre-deformation. In order to laterally guide the deformed shrink film during transport from the upper film forming station into the sealing station and to position it exactly on the recess, a clamp chain arranged on both sides is provided.

Die WO 2004/000650 A1 zeigt eine Tiefziehverpackungsmaschine zum Herstellen einer Schrumpfverpackung, wobei sowohl die Unterfolie als auch die Oberfolie eine Schrumpffolie ist. Die Tiefziehverpackungsmaschine weist eine Unterfolien- und eine Oberfolienformstation auf, in der die Folien jeweils individuell vor dem Versiegeln tiefgezogen werden, so dass ein zu verpackendes Produkt in der Siegelstation verpackt werden kann. Die Schrumpfwirkung der Folien, bei der sich diese eng an das Produkt anlegen, wird in einer der Tiefziehverpackungsmaschine nachfolgenden Schrumpfeinrichtung mittels Einbringen von Wärme, beispielsweise in einem Heißwasserbad, erzeugt. Ein Unterschied zwischen Schrumpfverpackungen und Skinverpackungen liegt darin, dass bei Schrumpfverpackungen die Wärme für den Schrumpfprozess erst nach dem Verpackungsvorgang zugeführt wird und bei Skinverpackungen die Wärme noch in der Siegelstation in die Skinfolie vor dem Siegelprozess eingebracht wird. Eine ähnliche Schrumpffolien-Verpackungsmaschine ist in der EP 2 412 643 A1 offenbart.The WO 2004/000650 A1 shows a thermoforming packaging machine for producing a shrink wrap, wherein both the lower film and the upper film is a shrink film. The thermoforming packaging machine has a bottom film and a top film forming station in which the films are each deep drawn individually prior to sealing, so that a product to be packaged can be packed in the sealing station. The shrinkage effect of the films, in which they apply tightly to the product, is produced in a shrinking device following the thermoforming packaging machine by introducing heat, for example in a hot water bath. A difference between shrink wrapping and skin packaging lies in the fact that in shrink packaging the heat for the shrinking process is supplied only after the packaging process, and in skin packaging the heat is still present in the sealing film in the skin film the sealing process is introduced. A similar shrink wrap packaging machine is in the EP 2 412 643 A1 disclosed.

Aus der EP 0 270 208 A1 ist eine Tiefziehverpackungsmaschine zum Herstellen einer Skinpackung bekannt. Eine Skinfolie als Oberfolie und eine Mulde, die in eine Unterfolie geformt und in die ein Produkt eingelegt wurde, werden gemeinsam in eine erste Formstation transportiert und allseitig zwischen einem Formwerkzeugunterteil und einem Formwerkzeugoberteil geklemmt, um die Skinfolie anschließend mittels Vakuum nach oben in einen Dom zu ziehen und zu erwärmen. Dieser Vorgang führt zu einer leichten Verformung, so dass nach dem Öffnen von Formwerkzeugunterteil und Formwerkzeugoberteil die Skinfolie während des Transports zusammen mit der Mulde und dem Produkt in eine nachfolgende Siegelstation keinen Druck auf das Produkt ausübt, solange das Produkt nur gering über die Mulde nach oben übersteht. Durch den Wärmeeintrag weist die Skinfolie bereits eine Elastizität auf, die geeignet ist, um in der Siegelstation nach dem Bilden einer Kammer durch ein Siegelwerkzeugunterteil und ein Siegelwerkzeugoberteil mittels Vakuum in einen Dom gezogen zu werden, der eine erheblich (4x) größere Vertiefung als der Dom im Formwerkzeugoberteil aufweist. Die Skinfolie wird anschließend im Dom auf eine erhöhte Temperatur erwärmt, um danach mittels Vakuum zwischen der Skinfolie und der Mulde eine Skinpackung zu erzeugen, bei der die Skinfolie sich eng an das Produkt und an die Innenflächen der Mulde anlegt und somit das Produkt luftdicht verschließt. Eine erhöhte Verformung der Skinfolie in der Formstation ist nicht vorgesehen.From the EP 0 270 208 A1 is known a thermoforming packaging machine for producing a skin pack. A skin film as a top film and a trough, which has been formed into a lower film and into which a product has been inserted, are transported together into a first forming station and clamped on all sides between a lower mold part and a mold upper part to subsequently vacuum-up the skin film into a dome pull and warm. This process leads to a slight deformation, so that after opening of mold lower part and upper mold part, the skin film during transport together with the trough and the product in a subsequent sealing station exerts no pressure on the product, as long as the product only slightly above the trough to the top survives. By the heat input, the skin film already has an elasticity, which is suitable to be pulled in the sealing station after forming a chamber through a sealing tool base and a sealing tool shell by means of vacuum in a dome, which has a significantly (4x) larger recess than the dome having in the mold shell. The skin film is then heated in the dome to an elevated temperature to then create by vacuum between the skin film and the trough a Skinpackung in which the skin film fits tightly against the product and on the inner surfaces of the trough and thus closes the product airtight. Increased deformation of the skin film in the forming station is not provided.

Bei über den Muldenrand vertikal überstehenden Produkten besteht beim Schließen von Siegelwerkzeugunterteil und Siegelwerkzeugoberteil die Gefahr von Faltenbildung im Bereich der Klemmung, was später zu Fehlern in der Siegelung bzw. zu Undichtigkeiten führen kann. Um eine solche Faltenbildung zu reduzieren oder zu verhindern, wird bisher mit steigendem Produktüberstand auch der seitliche Abstand von Produkt zum Muldenrand erhöht. Die so entstehenden Packungen weisen somit eine große Muldenfläche mit einem nach oben ragenden Produkt auf. Diese Verpackungen sind zum einen nicht ansprechend und zum anderen ist ein erhöhter Folienverbrauch von Ober- und Unterfolie die Folge, welches wiederum erhöhte Verpackungskosten zur Folge hat und gleichzeitig die Verpackungsleistung der Tiefziehverpackungsmaschine reduziert, da weniger Produkte während eines Arbeitstaktes verarbeitet werden können. Bei Tiefziehverpackungsmaschinen mit einem mehrspurigen und mehrreihigen Format ist das Risiko von Faltenbildung noch weiter erhöht.When sealing products overhanging the trough rim, there is a risk of wrinkling in the area of the clamping when closing the sealing tool lower part and the sealing tool upper part, which can later lead to errors in the seal or to leaks. In order to reduce or prevent such wrinkling, so far, the lateral distance of product is increased to the trough edge with increasing product supernatant. The resulting packages thus have a large trough surface with an upwardly projecting product. On the one hand, these packages are not appealing and, on the other hand, increased film consumption of the top and bottom film results, which in turn results in increased packaging costs and at the same time reduces the packaging performance of the thermoforming packaging machine, since fewer products can be processed during one working cycle. In thermoforming packaging machines with a multi-lane and multi-row format, the risk of wrinkling is even further increased.

Aufgabe der vorliegenden Erfindung ist es, eine Tiefziehverpackungsmaschine zur Verfügung zu stellen, die den Folienverbrauch bei der Herstellung einer Skinverpackung mit Produkten, die einen Produktüberstand aufweisen, reduziert.The object of the present invention is to provide a thermoforming packaging machine which reduces the film consumption in the production of a skin package with products which have a product supernatant.

Diese Aufgabe wird gelöst durch eine Tiefziehverpackungsmaschine mit den Merkmalen des Anspruchs 1 bzw. durch ein Verfahren zum Betrieb einer solchen Tiefziehverpackungsmaschine mit den Merkmalen des Anspruchs 7. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.This object is achieved by a thermoforming packaging machine with the features of claim 1 or by a method for operating such a thermoforming packaging machine with the features of claim 7. Advantageous developments of the invention are specified in the dependent claims.

Die erfindungsgemäße Tiefziehverpackungsmaschine umfasst eine Unterfolienformstation mit einer Anzahl von n Formmulden, wobei n eine ganze Zahl größer oder gleich 2 ist, zum Formen von n Mulden in eine Unterfolie, und eine Oberfolienformstation mit n evakuierbaren, jeweils von einer Klemmfläche umgebenen Domen, die eine erste Höhe zwischen der Klemmfläche und einer Vertiefung aufweisen, zum Formen von n Deckeln in eine Oberfolie, die eine Skinfolie ist. Dabei ist die Oberfolienformstation stromaufwärts in einer Produktionsrichtung vor einer Siegelstation angeordnet, wobei die Siegelstation dazu konfiguriert ist, die n Deckel mit den zugehörigen n Mulden zu versiegeln, wobei die Siegelstation ein Siegelwerkzeugoberteil umfasst, das n beheizbare und evakuierbare Dome mit einer zweiten Höhe aufweist. Die Dome sind dazu konfiguriert, die Oberfolie im jeweiligen Dom anliegen zu lassen und auf eine Skintemperatur zu erwärmen. Die erste Höhe beträgt wenigstens 80% der zweiten Höhe.The thermoforming packaging machine according to the invention comprises a bottom film forming station with a number of n mold cavities, where n is an integer greater than or equal to 2, for forming n wells in a bottom film, and a top film forming station with n evacuable, each surrounded by a clamping surface Domen, the first Height between the clamping surface and a recess, for molding n lids in a top film, which is a skin film. In this case, the top film forming station is arranged upstream in a production direction in front of a sealing station, wherein the sealing station is configured to seal the lid with the associated n troughs, wherein the sealing station comprises a sealing tool top, which has n heatable and evacuatable dome with a second height. The domes are configured to abut the top film in the respective dome and to heat to a skin temperature. The first height is at least 80% of the second height.

Ein Vorformen der Skinfolie in einer Oberfolienformstation auf die erste Höhe, die wenigstens 80% der zweiten Höhe beträgt, sorgt für ein druckfreies Überstülpen der Deckel über das Produkt, so dass der Abstand zwischen dem auf der Mulde befindlichen Produkt und dem Muldenrand auf unter 20 mm reduziert werden kann, selbst wenn Produkte mit einem Produktüberstand von mehr als 60mm mit einer Skinfolie verpackt werden. Durch die Reduzierung der Abmessungen der Mulden kann sowohl der Verbrauch an Unterfolie und Oberfolie reduziert werden, als auch die Maschinenleistung gesteigert werden, da während eines Arbeitstaktes in den Arbeitsstationen mehr Verpackungen bearbeitet werden können. Zusätzlich ist eine Skinverpackung mit wenig Abstand von Produkt zu Muldenrand ansprechender als mit einem großen Abstand. Gleichzeitig kann der Platzbedarf für solche Skinverpackungen in den Kühlregalen oder Kühltruhen reduziert werden.Preforming the skin film in a top film forming station to the first height, which is at least 80% of the second height, provides pressure-free slipping of the covers over the product so that the distance between the product on the well and the well edge is less than 20 mm can be reduced, even if products with a product supernatant of more than 60mm are packed with a skin film. By reducing the dimensions of the wells, both the consumption of lower film and upper film can be reduced, as well as the machine performance can be increased because during a work cycle in the workstations more packaging can be processed. In addition, a Skinverpackung with little distance from product to Muldenrand more appealing than with a large distance. At the same time, the space required for such skin packaging in the refrigerated shelves or cabinets can be reduced.

Vorzugsweise beträgt die zweite Höhe wenigstens 60 mm, in einer besonders vorteilhaften Ausführung wenigstens 80 mm, um besonders große bzw. über den Muldenrand nach oben überstehende Produkte verpacken zu können.Preferably, the second height is at least 60 mm, in a particularly advantageous embodiment at least 80 mm in order to be able to pack particularly large or over the trough edge upwardly projecting products.

Bevorzugt beträgt die Skintemperatur wenigstens 170 °C, um eine luftdichte Flächenversiegelung zwischen der Skinfolie und der Mulde zu erreichen.Preferably, the skin temperature is at least 170 ° C to achieve an airtight surface seal between the skin sheet and the trough.

Vorzugsweise ist eine beidseitig der Oberfolie angeordnete Oberfolientransporteinrichtung vorgesehen, um die Deckel von der Oberfolienformstation in die Siegelstation zu transportieren. So kann der Deckel synchron zur Mulde und zum Produkt bis in die Siegelstation positioniert werden, und Querspannungen in der Skinfolie selbst führen durch das beidseitige Halten der Skinfolie bis zum Klemmen in der Siegelstation nicht zu Faltenbildung, die zu einer mangelnden Luftdichtigkeit führen können.Preferably, an upper film transport device arranged on both sides of the upper film is provided in order to transport the covers from the upper film forming station into the sealing station. Thus, the cover can be positioned synchronously with the trough and the product as far as the sealing station, and transverse stresses in the skin foil itself do not lead to wrinkling due to the two-sided holding of the skin foil until it is clamped in the sealing station, which can lead to a lack of airtightness.

Die Formmulden weisen eine Muldentiefe auf und vorzugsweise beträgt die zweite Höhe der Dome im Siegelwerkzeugoberteil wenigstens das 5-fache, bevorzugt wenigstens das 8-fache, der Muldentiefe. Dies ermöglicht eine attraktive und im Volumen reduzierte Skinverpackung mit einem hohen Produkt auf einer Art Teller, der durch die Mulde gebildet wird.The mold cavities have a bowl depth and preferably the second height of the domes in the sealing tool upper part is at least 5 times, preferably at least 8 times, the cavity depth. This allows an attractive and volume-reduced skin packaging with a high product on a kind of plate, which is formed by the trough.

In einer besonders vorteilhaften Ausführung weisen die n Formmulden in der Unterfolienformstation jeweils eine Öffnungslänge längs und eine Öffnungsbreite quer zur Produktionsrichtung aufweisen, und die n Dome im Oberfolienformwerkzeugoberteil weisen jeweils eine erste Öffnungslänge längs und eine erste Öffnungsbreite quer zur Produktionsrichtung auf, wobei die erste Öffnungslänge bzw. die erste Öffnungsbreite der Dome jeweils zwischen 80% und 95% der Öffnungslänge bzw. der Öffnungsbreite der Formmulde beträgt, damit die geformten Deckel beim Zuführen in die Siegelstation größere Abmessungen als ein zu verpackendes Produkt aufweisen. Durch das Vorformen von Deckeln kann die Skinfolie aufgrund des geringen Abstands zur Innenwand der Dome im Siegelwerkzeugoberteil mittels Vakuum schnell angelegt und erwärmt werden, um anschließend den Skinvorgang ausführen zu können. Dies verkürzt die Zykluszeit der Siegelstation und erhöht damit insgesamt weiter die Verpackungsleistung.In a particularly advantageous embodiment, the n mold cavities in the bottom film forming station each have an opening length along and an opening width transversely to the production direction, and the n domes in the top film mold top each have a first opening length along and a first opening width transversely to the production direction, wherein the first opening length or The first opening width of the domes is between 80% and 95% of the opening length or the opening width of the mold cavity, respectively, in order that the molded covers, when fed into the sealing station, have larger dimensions than a product to be packaged. Due to the preforming of lids, the skin film can be quickly applied and heated by means of vacuum due to the small distance to the inner wall of the dome in the sealing tool shell and then to perform the skin process can. This shortens the cycle time of the sealing station and thus further increases overall packaging performance.

Ein erfindungsgemäßes Verfahren zum Betrieb einer Tiefziehverpackungsmaschine zum Herstellen einer Skinpackung, die ein mindestens über 50 mm vertikal über einen Muldenrand einer Mulde einer Unterfolie nach oben überstehendes Produkt umfasst, wobei die Oberfolie eine Skinfolie ist, umfasst folgende Schritte:

  • gemeinsames Formen einer Anzahl von n Mulden, wobei n größer oder gleich 2 ist, in eine Unterfolie in einer Unterfolienformstation während eines Arbeitstaktes,
  • gemeinsames Formen von n Deckeln in eine Oberfolie in einer Oberfolienformstation bei einer ersten Temperatur während eines Arbeitstaktes, wobei die Deckel anschließend eine erste Höhe gegenüber einer Oberfolientransportebene aufweisen,
  • gemeinsames Zuführen der n Mulden und der n Deckel in eine Siegelstation,
  • Anlegen der n Deckel an die Innenwand der Dome der Siegelstation mittels Vakuum zwischen den n Deckeln und den n Domen und Erwärmen der n Deckel auf eine zweite Temperatur,
  • Anlegen der n Deckel an die jeweiligen Produkte und die dazugehörigen Mulden mittels eines zwischen den n Deckeln und den n Mulden erzeugten Vakuums.
A method according to the invention for operating a thermoforming packaging machine for producing a skin pack which comprises a product projecting vertically above at least 50 mm vertically above a trough edge of a trough of a lower foil, wherein the upper foil is a skin foil, comprises the following steps:
  • co-forming a number of n wells, where n is greater than or equal to 2, into a sub-foil in a sub-foil forming station during a work cycle,
  • co-forming n covers into a top film in a top film forming station at a first temperature during a work cycle, the covers then having a first height from a top film transport plane,
  • jointly feeding the n wells and the n lid into a sealing station,
  • Apply the n cover to the inner wall of the dome of the sealing station by means of vacuum between the n covers and the n domes and heating the n cover to a second temperature,
  • Applying the covers to the respective products and the associated troughs by means of a vacuum created between the n lids and the n troughs.

Vorzugsweise werden die Deckel in der Oberfolienformstation derart geformt, dass die Deckel während des Transports von der Oberfolienformstation in die Siegelstation sich den dazugehörigen Mulden annähern, ohne dabei einen Druck auf die Produkte der dazugehörigen Mulden auszuüben.Preferably, the lids are formed in the top film forming station such that the lids approach the associated troughs during transport from the top film forming station to the sealing station without exerting any pressure on the products of the associated troughs.

Vorzugsweise wird dabei die Oberfolie mittels einer Oberfolientransporteinrichtung, beispielsweise zweier beidseitig der Oberfolie angeordneter Klammerketten, transportiert.In this case, the upper film is preferably transported by means of an upper film transport device, for example two staple chains arranged on both sides of the upper film.

Die erste Temperatur, auf die die Skinfolie erwärmt wird, beträgt bevorzugt zwischen 100°C und 140°C, um lediglich eine bleibende Verformung der Skinfolie zu Deckeln zu bewirken.The first temperature to which the skin film is heated is preferably between 100 ° C and 140 ° C, to cause only a permanent deformation of the skin film to cover.

Die zweite Temperatur, auf die die Skinfolie erwärmt wird, beträgt bevorzugt zwischen 170°C und 220°C, um die Elastizität der Skinfolie für den anschließenden Skinprozess zu erzeugen.The second temperature to which the skin film is heated is preferably between 170 ° C and 220 ° C to produce the elasticity of the skin film for the subsequent skin process.

Im Folgenden wird ein vorteilhaftes Ausführungsbeispiel der Erfindung anhand einer Zeichnung näher erläutert. Im Einzelnen zeigen:

Fig. 1
eine erfindungsgemäße Tiefziehverpackungsmaschine in einer schematischen Seitenansicht,
Fig. 2a
eine schematische Seitenansicht einer Unterfolienformstation,
Fig. 2b
eine Draufsicht auf ein Formwerkzeugunterteil,
Fig. 3a
eine schematische Seitenansicht einer Oberfolienformstation,
Fig. 3b
eine Ansicht auf ein Oberfolienformwerkzeugoberteil,
Fig. 4a
eine schematische Seitenansicht einer Siegelstation in einer geschlossenen Stellung,
Fig. 4b
eine Untersicht auf ein Siegelwerkzeugoberteil,
Fig. 5
die Siegelstation von Fig. 4a nach Anlegen der Skinfolie im Dom und
Fig. 6
die Siegelstation von Fig. 4a nach Anlegen der Skinfolie an Produkt und Mulde.
In the following, an advantageous embodiment of the invention is explained in detail with reference to a drawing. In detail show:
Fig. 1
a thermoforming packaging machine according to the invention in a schematic side view,
Fig. 2a
a schematic side view of a bottom film forming station,
Fig. 2b
a plan view of a mold base,
Fig. 3a
a schematic side view of a top film forming station,
Fig. 3b
a view of a top film mold top,
Fig. 4a
a schematic side view of a sealing station in a closed position,
Fig. 4b
a subview of a seal tool shell,
Fig. 5
the sealing station of Fig. 4a after applying the skin film in the cathedral and
Fig. 6
the sealing station of Fig. 4a after applying the skin film to product and trough.

Gleiche Komponenten sind in den Figuren durchgängig mit gleichen Bezugszeichen versehen.The same components are provided throughout the figures with the same reference numerals.

Fig. 1 zeigt eine erfindungsgemäße Tiefziehverpackungsmaschine 1 in einer schematischen Seitenansicht und mit einer Produktionsrichtung R. In Produktionsrichtung R sind nacheinander mehrere Arbeitsstationen wie eine Unterfolienformstation 2, eine Oberfolienformstation 3, eine Siegelstation 4, eine Querschneidstation 5 und eine Längsschneidstation 6 vorgesehen. Im Folgenden soll die Arbeitsweise der erfindungsgemäßen Tiefziehverpackungsmaschine 1 näher erläutert werden. Fig. 1 1 shows a thermoforming packaging machine 1 according to the invention in a schematic side view and with a production direction R. In the production direction R, several workstations such as a bottom film forming station 2, a top film forming station 3, a sealing station 4, a cross cutting station 5 and a longitudinal cutting station 6 are provided in succession. In the following, the operation of the thermoforming packaging machine 1 according to the invention will be explained in more detail.

Eine Unterfolie 7, die beispielsweise als Kunststoff-Hartfolie ausgeführt ist, wird von einer ersten Folienrolle 8 abgerollt und von einer nicht näher dargestellten Klammerkette beidseitig erfasst und in die Unterfolienformstation 2 transportiert. In der Unterfolienformstation 2 wird die Unterfolie 7 erwärmt und zwei Mulden 9, die gegenüber der Zeichenebene hintereinander und damit zweispurig (d.h. in Produktionsrichtung R nebeneinander) angeordnet sind, in die Unterfolie 7 geformt. Entlang einer Einlegestrecke 10, die zwischen der Unterfolienformstation 2 und der Siegelstation 4 angeordnet ist, werden Produkte 50 in die Mulden 9 gelegt, wobei die Produkte 50 eine Höhe von mehr als 50 mm aufweisen.A lower film 7, which is designed for example as a plastic hard film, is unrolled from a first film roll 8 and detected on both sides by a staple chain, not shown, and transported into the lower film forming station 2. In the lower film forming station 2, the lower film 7 is heated and two troughs 9, which are arranged one behind the other and thus two-lane (i.e., side by side in the production direction R) with respect to the drawing plane, are formed in the lower film 7. Along an insertion path 10, which is arranged between the lower film forming station 2 and the sealing station 4, products 50 are placed in the wells 9, wherein the products 50 have a height of more than 50 mm.

Eine Oberfolie 11, die als Skinfolie ausgeführt ist, wird von einer zweiten Folienrolle 12 abgerollt und mittels einer beidseitig angeordneten Oberfolientransporteinrichtung 13 in die Oberfolienformstation 3 transportiert und dort auf eine erste Temperatur von ca. 120°C erwärmt, um darin zwei Deckel 14, die gegenüber der Zeichenebene hintereinander und damit zweispurig angeordnet sind, zu formen. Während der Transportbewegung der Deckel 14 mittels der Oberfolientransporteinrichtung 13 hin zur Siegelstation 4 werden die Deckel 14 näher an die Mulden 9 bzw. an die Unterfolie 4 herangeführt und dabei über die Produkte 50 gestülpt, ohne dabei einen Druck auf die Produkte 50 auszuüben, da die Deckel 14 eine Größe der Ausformung aufweisen, die größer als die Abmessung der Produkte 11 ist.A top film 11, which is designed as a skin film, is unwound from a second film roll 12 and transported by means of a two-sided upper film transport device 13 in the Oberfolienformstation 3 and heated there to a first temperature of about 120 ° C to two lids 14, the opposite to the plane of the drawing and thus arranged in two lanes, to shape. During the transport movement of the cover 14 by means of the upper film transport device 13 towards the sealing station 4, the lid 14 are brought closer to the troughs 9 and the lower film 4 and thereby slipped over the products 50, without exerting pressure on the products 50, as the Cover 14 have a size of the molding, which is greater than the dimension of the products 11.

Die Oberfolientransporteinrichtung 13, beispielsweise in Form von zwei beidseitig der Oberfolie 11 angeordneten Klammerketten 13, übernimmt hierbei zum einen die Funktion der genauen Positionierung der Deckel 14 über bzw. auf die Produkte 50 und wird synchron mit der Klammerkette für die Unterfolie 7 bewegt. Zum anderen übernimmt die Oberfolientransporteinrichtung 13 die Funktion des seitlichen Haltens der Skinfolie 11 bzw. der Deckel 14 während der Transportbewegung und innerhalb des Siegelwerkzeugs 4. So kann ein Verziehen bzw. eine Faltenbildung der Skinfolie 11 durch evtl. auftretende Querspannungen innerhalb der Skinfolie 11 verhindert werden.The upper film transporting device 13, for example in the form of two staple chains 13 arranged on both sides of the upper film 11, assumes the function of accurately positioning the covers 14 over or onto the products 50 and is moved synchronously with the staple chain for the lower film 7. On the other hand, the upper film transporting device 13 takes over the function of the lateral holding of the skin film 11 or the cover 14 during the transport movement and within the sealing tool 4. Thus warping or wrinkling of the skin film 11 can be prevented by possibly occurring transverse stresses within the skin film 11 ,

In der Siegelstation 4 werden die Deckel 14 nach Bilden einer Kammer 15 durch ein Siegelwerkzeugoberteil 16 und ein Siegelwerkzeugunterteil 17 mittels eines erzeugten Vakuums zwischen den Deckeln 14 und in der Fig. 3a näher dargestellten Domen 18 im Siegelwerkzeugoberteil 16 an die Innenwand der Dome 18 geformt und auf eine Skintemperatur von beispielsweise 180 °C erwärmt, um eine für den nachfolgenden Skinprozess entsprechende Elastizität aufzuweisen. Gleichzeitig wird ein weiteres Vakuum im Inneren der Verpackung 19, nämlich zwischen Deckeln 14 und Mulden 9 angelegt. Durch dieses Vakuum und ein Belüften des Siegelwerkzeugoberteils 16 auf Umgebungsdruck legt sich der elastische Deckel 14 sowohl eng an das Produkt 11 als auch an die Mulde 9 an, wobei bei diesem Skinprozess die Skinfolie 11 bzw. die Deckel 14 mit der Mulde 9 eine flächige und luftdichte Siegelung erzeugen. Diese Verpackung 19 wird als eine Skinpackung bezeichnet, da das auf bzw. in der Mulde 9 befindliche Produkt 11 mit einer eng am Produkt 50 anliegenden Folie 11, ähnlich einer zweiten Haut, an die Unterfolie 7 bzw. die Mulde 9 luftdicht versiegelt wird.In the sealing station 4, the lids 14 after forming a chamber 15 by a sealing tool upper part 16 and a sealing tool lower part 17 by means of a generated vacuum between the lids 14 and in the Fig. 3a formed domes 18 in the sealing tool upper part 16 to the inner wall of the dome 18 and heated to a skin temperature of, for example, 180 ° C, to have an appropriate for the subsequent skin process elasticity. At the same time, there is another vacuum inside the package 19, namely between lids 14 and troughs 9 created. By this vacuum and a venting of the sealing tool shell 16 to ambient pressure, the elastic cover 14 applies both tight to the product 11 and to the trough 9, wherein in this skin process, the skin film 11 and the cover 14 with the trough 9 a flat and produce airtight seal. This package 19 is referred to as a skin pack, since the product 11 located on or in the trough 9 is sealed airtight to the bottom foil 7 or the trough 9 with a foil 11 resting closely on the product 50, similar to a second skin.

Im weiteren Verlauf in Produktionsrichtung R werden die zweispurig nebeneinander transportierten Verpackungen 19 mittels der Querschneidstation 5 und der Längsschneidstation 6 vereinzelt und über ein Transportband 20 aus der Tiefziehverpackungsmaschine 1 herausbefördert.In the further course in the production direction R, the two-lane next to each transported packages 19 are isolated by means of the cross-cutting station 5 and the longitudinal cutting station 6 and conveyed out of the thermoforming packaging machine 1 via a conveyor belt 20.

In der Fig. 2a wird die Unterfolienformstation 2 näher gezeigt. Sie weist ein Formwerkzeugoberteil 21 oberhalb der Unterfolie 7 auf, welche als Heizplatte ausgeführt ist, um die Unterfolie 7 vor dem Formen auf eine dafür notwendige Temperatur zu erwärmen. Ein in Pfeilrichtung bewegbares Formwerkzeugunterteil 22, das unterhalb der Unterfolie 7 angeordnet ist, weist zwei Formmulden 23 auf, in die die erwärmte Unterfolie 7 mittels Vakuum von unten und/oder Druckluft von oben in die Formmulde 23 zu Mulden 9 geformt wird. Die Mulde 9 bzw. die Formmulde 23 weist eine senkrecht zur Unterfolie 7 ausgerichtete Muldentiefe T auf. Die Mulde 9 selbst weist nach dem Formprozess desweiteren einen Muldenrand 25 auf.In the Fig. 2a the lower film forming station 2 is shown in more detail. It has a mold upper part 21 above the lower film 7, which is designed as a heating plate to heat the lower film 7 before molding to a temperature necessary for it. A movable in the arrow direction mold lower part 22 which is disposed below the lower film 7, has two mold cavities 23, in which the heated lower film 7 is formed by means of vacuum from below and / or compressed air from above into the mold cavity 23 to troughs 9. The trough 9 or the molding trough 23 has a trough depth T oriented perpendicular to the lower foil 7. The trough 9 itself also has a trough edge 25 after the molding process.

Fig. 2b zeigt das Formwerkzeugunterteil 22 mit den zwei Formmulden 23 in einer Draufsicht. Die zwei Formmulden 23 weisen jeweils eine Öffnung 24 nach oben auf, die wiederum eine sich parallel zur Transportrichtung R erstreckende Öffnungslänge L und eine sich quer hierzu erstreckende Öffnungsbreite B aufweisen. Fig. 2b shows the mold lower part 22 with the two mold cavities 23 in a plan view. The two mold cavities 23 each have an opening 24 upwards, which in turn have an opening length L extending parallel to the transport direction R and an opening width B extending transversely thereto.

Anhand von Fig. 3a wird die Oberfolienformstation 3 näher erläutert. Die Oberfolienformstation 3 umfasst ein Oberfolienformwerkzeugunterteil 26, das als Heizplatte ausgeführt ist, und ein in Pfeilrichtung bewegbares Oberfolienformwerkzeugoberteil 27 mit zwei Domen 28 und eine Klemmfläche 29 zum Klemmen der Skinfolie 11 zwischen dem Oberfolienformwerkzeugunterteil 26 und dem Oberfolienformwerkzeugoberteil 27. Die Dome 28 weisen eine erste Höhe D1 auf, die durch die Ebenen der Klemmfläche 29 und einer Vertiefung 35 mit einem maximalen Abstand einer Innenwand 30 der Dome 28 definiert wird. Bei einer geschlossenen Arbeitsstellung der Oberfolienformstation 3 wird die Skinfolie 11 zwischen dem Oberfolienformwerkzeugunterteil 26 und dem Oberfolienformwerkzeugoberteil 27 geklemmt, von dem Oberfolienformwerkzeugunterteil 26 erwärmt und mittels Vakuum in die Dome 28 gezogen. Nach einem Öffnen der Oberfolienformstation 3 ist ein Deckel 14 in die Skinfolie 11 geformt.Based on Fig. 3a the upper film forming station 3 will be explained in more detail. The top sheet forming station 3 comprises a top sheet die bottom 26 configured as a heating plate and an upper sheet forming die 27 having two domes 28 and a clamping surface 29 for clamping the skin sheet 11 between the top sheet forming die bottom 26 and the top sheet forming die top 27. The domes 28 have a first height D1, which passes through the planes of the clamping surface 29 and a recess 35 is defined with a maximum distance of an inner wall 30 of the domes 28. In a closed working position of the upper film forming station 3, the skin film 11 is clamped between the Oberfolienformwerkzeugunterteil 26 and the Oberfolienformwerkzeugoberteil 27, heated by the Oberfolienformwerkzeugunterteil 26 and pulled by vacuum into the dome 28. After opening the upper film forming station 3, a lid 14 is formed in the skin film 11.

Fig. 3b zeigt eine Schnittansicht A-A, siehe Fig. 3, von unten auf die Klemmfläche 29 des Oberfolienformwerkzeugoberteils 27. Die zwei Dome 28 weisen jeweils eine Öffnung 28a auf, die wiederum eine sich parallel zur Transportrichtung R1 der Skinfolie erstreckende Öffnungslänge L1 und eine sich quer hierzu erstreckende Öffnungsbreite B1 aufweisen. Diese Abmessungen entsprechen weitestgehend den entsprechenden Abmessungen der Deckel 14, da Schrumpfungseffekte auftreten können. Der Transport der Skinfolie 11 erfolgt über eine Oberfolientransporteinrichtung 13, in Fig. 3a als zwei beidseitig angeordnete Klammerketten 13 dargestellt. Fig. 3b shows a sectional view AA, see Fig. 3 from below onto the clamping surface 29 of the upper film forming tool upper part 27. The two domes 28 each have an opening 28a, which in turn have an opening length L1 extending parallel to the transport direction R1 of the skin film and an opening width B1 extending transversely thereto. These dimensions largely correspond to the corresponding dimensions of the cover 14, since shrinkage effects can occur. The transport of the skin film 11 via an upper film transport device 13, in Fig. 3a shown as two mutually arranged staple chains 13.

Fig. 4 zeigt die Siegelstation 4 mit geschlossenem Siegelwerkzeugoberteil 16 und Siegelwerkzeugunterteil 17, wobei die Produkte 50 von den Deckeln 14 und den Mulden 9 umschlossen werden und die Deckel 14 und die Mulden 9 umlaufend zwischen dem Siegelwerkzeugoberteil 16 und dem Siegelwerkzeugunterteil 17 geklemmt sind. In der so gebildeten Kammer 15 werden über ein am Siegelwerkzeugoberteil 16 angelegtes Vakuum V die Deckel 14 an die Innenwand 32 des Doms 18 des Siegelwerkzeugoberteils 16 angesaugt und legen sich dann an die Innenwand 32 an. Das Siegelwerkzeugoberteil 16 umfasst eine Heizung 33, mittels derer die Deckel 14 auf die Skintemperatur erwärmt werden. Fig. 4 shows the sealing station 4 with closed sealing tool shell 16 and sealing tool base 17, the products 50 are enclosed by the lids 14 and the wells 9 and the lid 14 and the wells 9 circumferentially between the sealing tool upper part 16 and the sealing tool bottom 17 are clamped. In the chamber 15 thus formed, the covers 14 are sucked against the inner wall 32 of the mandrel 18 of the sealing tool upper part 16 via a vacuum V applied to the sealing tool upper part 16 and then bear against the inner wall 32. The sealing tool upper part 16 comprises a heater 33, by means of which the cover 14 are heated to the skin temperature.

Analog zur Fig. 3b weist das Siegelwerkzeugoberteil 16 wie das Oberfolienformwerkzeugoberteil 27 zwei Dome 18 mit einer sich parallel zur Produktionsrichtung R erstreckenden Öffnungslänge L2 und einer sich quer hierzu erstreckenden Öftnungsbreite B2 sowie einer zweiten Höhe D2 auf. Dargestellt ist dies in Figur 4b in der Untersicht auf die Dome 18. Dabei bezeichnet 31 die Öffnung 18 jedes Doms 18. Alle drei Abmessungen L2, B2 und D2 der Dome 18 des Siegelwerkzeugoberteils 16 sind gegenüber den Abmessungen L1, B1 und D1 der Dome 28 des Oberfolienformwerkzeugoberteils 27 um ca. 5% bis 20% größer. Dies liegt unter anderem daran, dass ein Abstand A zwischen zwei aufeinander in Transportrichtung R folgenden Deckeln 14 vorteilhaft ist, damit das Siegelwerkzeugoberteil 16 in seine geschlossene Stellung, wie in Fig. 4 dargestellt, bewegt werden kann, ohne dass dabei ein direkt stromaufwärts vor der Siegelstation 4 befindlicher Deckel 14 zu stark negativ von einer Strahlungswärme des Siegelwerkzeugoberteils 16 beeinflusst wird, selbst wenn in dieser Position der Deckel 14 bereits weitestgehend über das Produkt 50 gestülpt ist.Analogous to Fig. 3b the sealing tool upper part 16, like the upper film mold upper part 27, has two domes 18 with an opening length L2 extending parallel to the production direction R and an opening width B2 extending transversely thereto and a second height D2. This is shown in FIG. 4b In the bottom view of the dome 18. In this case 31 denotes the opening 18 of each dome 18. All three dimensions L2, B2 and D2 of the dome 18 of the sealing tool shell 16 are compared to the dimensions L1, B1 and D1 of the dome 28 of the upper film mold upper 27 by approx. 5% to 20% bigger. One of the reasons for this is that a distance A between two lids 14 following one another in the direction of transport R is advantageous, so that the sealing tool upper part 16 in its closed position, as in Fig. 4 can be moved, without causing a directly upstream of the sealing station 4 located cover 14 is too strongly influenced by a radiation heat of the sealing tool shell 16, even if in this position, the lid 14 is already largely over the product 50 is slipped.

Fig. 5 zeigt die Phase, bei der die Deckel 14 in den Domen 18 anliegen und mittels der Heizung 33 auf eine zweite Temperatur, d. h. die sog. Skintemperatur, erwärmt werden, während der Raum zwischen den Mulden 9 und den Deckeln 14 mittels Vakuum V evakuiert wird. Fig. 5 shows the phase in which the cover 14 abut in the domes 18 and by means of the heater 33 to a second temperature, ie the so-called. Skintemperatur, are heated, while the space between the wells 9 and the covers 14 is evacuated by means of vacuum V.

In Fig. 6 zeigt die Situation nach dem Belüften des Siegelwerkzeugoberteils 16 und dem Anlegen der Deckel 14 bzw. der Skinfolie 11 an das Produkt 50 und an die Mulde 9.In Fig. 6 shows the situation after venting the sealing tool shell 16 and the application of the lid 14 and the skin film 11 to the product 50 and the trough. 9

Claims (11)

Tiefziehverpackungsmaschine (1), umfassend eine Unterfolienformstation (2) mit einer Anzahl von n Formmulden (23), wobei n größer oder gleich 2 ist, zum Formen von n Mulden (9) in eine Unterfolie (7), und eine Oberfolienformstation (3) mit n evakuierbaren und jeweils von einer Klemmfläche (29) umgebenen Domen (28), die eine erste Höhe (D1) zwischen der Klemmfläche (29) und einer Vertiefung (35) aufweisen, zum Formen von n Deckeln (14) in eine Oberfolie (11), die eine Skinfolie ist, wobei die Oberfolienformstation (3) stromaufwärts in einer Produktionsrichtung (R) vor einer Siegelstation (4) angeordnet ist, wobei die Siegelstation (4) dazu konfiguriert ist, die n Deckel (14) mit den zugehörigen n Mulden (9) zu versiegeln, wobei die Siegelstation (4) ein Siegelwerkzeugoberteil (16) umfasst, das n beheizbare und evakuierbare Dome (18) mit einer zweiten Höhe (D2) aufweisen, die dazu konfiguriert sind, die Oberfolie (11) im jeweiligen Dom (18) anliegen zu lassen und auf eine Skintemperatur zu erwärmen, wobei die erste Höhe (D1) wenigstens 80% der zweiten Höhe (D2) beträgt.Thermoforming packaging machine (1), comprising a bottom film forming station (2) with a number of n mold cavities (23), where n is greater than or equal to 2, for forming n cavities (9) in a bottom film (7), and a top film forming station (3) with n evacuable and each surrounded by a clamping surface (29) domes (28) having a first height (D1) between the clamping surface (29) and a recess (35) for forming n covers (14) in a top film ( 11), which is a skin sheet, the top sheet forming station (3) being located upstream in a direction of production (R) in front of a sealing station (4), the sealing station (4) being configured to n the covers (14) with the associated n Sealing cavities (9), wherein the sealing station (4) comprises a sealing tool upper part (16) having n heatable and evacuable domes (18) with a second height (D2), which are configured, the upper film (11) in the respective Dom (18) to rest and on a Skintem temperature, wherein the first height (D1) is at least 80% of the second height (D2). Tiefziehverpackungsmaschine nach Anspruch 1, dadurch gekennzeichnet, dass die zweite Höhe (D2) wenigstens 60 mm, vorzugsweise wenigstens 80 mm beträgt.Thermoforming packaging machine according to claim 1, characterized in that the second height (D2) is at least 60 mm, preferably at least 80 mm. Tiefziehverpackungsmaschine nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Skintemperatur wenigstens 170 °C beträgt.Thermoforming packaging machine according to one of the preceding claims, characterized in that the skin temperature is at least 170 ° C. Tiefziehverpackungsmaschine nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass eine beidseitig der Oberfolie (11) angeordnete Oberfolientransporteinrichtung (13) vorgesehen ist, um die Deckel (14) von der Oberfolienformstation (3) in die Siegelstation (4) zu transportieren.Thermoforming packaging machine according to one of the preceding claims, characterized in that an upper film transport device (13) arranged on both sides of the upper film (11) is provided for transporting the covers (14) from the upper film forming station (3) into the sealing station (4). Tiefziehverpackungsmaschine nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Formmulden (23) eine Muldentiefe (T) aufweisen und die zweite Höhe (D2) der Dome (18) im Siegelwerkzeugoberteil (16) wenigstens das 5-fache, vorzugsweise wenigstens das 8-fache, der Muldentiefe (T) beträgt.Thermoforming packaging machine according to one of the preceding claims, characterized in that the mold cavities (23) have a bowl depth (T) and the second height (D2) of the domes (18) in the sealing tool upper part (16) at least 5 times, preferably at least 8 fold, the well depth (T) is. Tiefziehverpackungsmaschine nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die n Formmulden (23) in der Unterfolienformstation (2) jeweils eine Öffnungslänge (L) längs und eine Öffnungsbreite (B) quer zur Produktionsrichtung (R) aufweisen und die n Dome (28) im Oberfolienformwerkzeugoberteil (27) jeweils eine erste Öffnungslänge (L1) längs und eine erste Öffnungsbreite (B1) quer zur Produktionsrichtung (R) aufweisen, wobei die erste Öffnungslänge (L1) bzw. die erste Öffnungsbreite (B1) der Dome (28) jeweils zwischen 80% und 95% der Öffnungslänge (L) bzw. der Öffnungsbreite (B) der Formmulde (23) beträgt, damit die geformte Deckel (14) beim Zuführen in die Siegelstation (4) größere Abmessungen als ein zu verpackenden Produkt (50) aufweisen.Thermoforming packaging machine according to one of the preceding claims, characterized in that the n mold cavities (23) in the lower film forming station (2) each have an opening length (L) along and an opening width (B) transversely to the production direction (R) and the n dome (28) in the upper film mold upper part (27) each have a first opening length (L1) along and a first opening width (B1) transverse to the production direction (R), wherein the first opening length (L1) or the first opening width (B1) of the dome (28) respectively between 80% and 95% of the opening length (L) and the opening width (B) of the mold cavity ( 23), so that the molded lid (14) when fed into the sealing station (4) have larger dimensions than a product to be packaged (50). Verfahren zum Betrieb einer Tiefziehverpackungsmaschine (1) zum Herstellen einer Skinpackung (19), die ein mindestens über 50 mm vertikal über einen Muldenrand (25) einer Mulde (9) einer Unterfolie (7) nach oben überstehendes Produkt (50) umfasst, wobei die Oberfolie (11) eine Skinfolie ist, umfassend folgende Schritte: - gemeinsames Formen einer Anzahl von n Mulden (9), wobei n größer oder gleich 2 ist, in eine Unterfolie (7) in einer Unterfolienformstation (2) während eines Arbeitstaktes, - gemeinsames Formen von n Deckeln (14) in eine Oberfolie (11) in einer Oberfolienformstation (3) bei einer ersten Temperatur während eines Arbeitstaktes, wobei die Deckel (14) anschließend eine erste Höhe (D1) gegenüber einer Oberfolientransportebene aufweisen, - gemeinsames Zuführen der n Mulden (9) und der n Deckel (14) in eine Siegelstation (4), - Anlegen der n Deckel (14) an die Innenwand (32) der Dome (18) der Siegelstation (4) mittels Vakuum zwischen den n Deckeln (14) und den n Domen (18) und Erwärmen der n Deckel (14) auf eine zweite Temperatur, - Anlegen der n Deckel (14) an die jeweiligen Produkte (50) und die dazugehörigen Mulden (9) mittels eines zwischen den n Deckeln (14) und den n Mulden (9) erzeugten Vakuums. Method for operating a thermoforming packaging machine (1) for producing a skin pack (19) comprising a product (50) projecting upwards over at least 50 mm vertically above a trough edge (25) of a trough (9) of a bottom foil (7), wherein the Upper film (11) is a skin film, comprising the following steps: - jointly forming a number of n troughs (9), where n is greater than or equal to 2, in a bottom foil (7) in a bottom foil forming station (2) during a working cycle, co-forming n covers (14) in a top film (11) in a top film forming station (3) at a first temperature during a work cycle, the covers (14) then having a first height (D1) opposite a top film transport plane, - common supply of the n troughs (9) and the n cover (14) in a sealing station (4), - Applying the n cover (14) to the inner wall (32) of the dome (18) of the sealing station (4) by means of vacuum between the n covers (14) and the n Domen (18) and heating the n cover (14) on a second temperature, - Apply the n cover (14) to the respective products (50) and the associated wells (9) by means of a between the n covers (14) and the n troughs (9) generated vacuum. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass die Deckel (14) in der Oberfolienformstation (3) derart geformt werden, dass die Deckel (14) während des Transports von der Oberfolienformstation (3) in die Siegelstation (4) sich den dazugehörigen Mulden (9) annähern, ohne dabei einen Druck auf die Produkte (50) der dazugehörigen Mulden (9) auszuüben.A method according to claim 7, characterized in that the covers (14) in the upper film forming station (3) are shaped such that the covers (14) during transport from the Oberfolienformstation (3) in the sealing station (4) the associated troughs ( 9) without exerting pressure on the products (50) of the associated wells (9). Verfahren nach Anspruch 8, dadurch gekennzeichnet, dass die Oberfolie (11) mittels einer Oberfolientransporteinrichtung (13), vorzugsweise zweier beidseitig der Oberfolie (11) angeordneter Klammerketten (13), transportiert wird.A method according to claim 8, characterized in that the upper film (11) by means of an upper film transport device (13), preferably two on both sides of the upper film (11) arranged staple chains (13) is transported. Verfahren nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, dass die erste Temperatur zwischen 100°C und 140°C beträgt.Method according to one of claims 7 to 9, characterized in that the first temperature is between 100 ° C and 140 ° C. Verfahren nach einem der Ansprüche 7 bis 10, dadurch gekennzeichnet, dass die zweite Temperatur zwischen 170°C und 220°C beträgt.Method according to one of claims 7 to 10, characterized in that the second temperature is between 170 ° C and 220 ° C.
EP14173592.8A 2014-06-24 2014-06-24 Deep drawing packaging machine and method Active EP2960165B1 (en)

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DK14173592.8T DK2960165T3 (en) 2014-06-24 2014-06-24 Deep draw packing machine and method
ES14173592.8T ES2644994T3 (en) 2014-06-24 2014-06-24 Deep drawing and process packaging machine
EP14173592.8A EP2960165B1 (en) 2014-06-24 2014-06-24 Deep drawing packaging machine and method
DE202015002847.0U DE202015002847U1 (en) 2014-06-24 2015-04-20 Thermoforming packaging machine
US14/746,613 US10384820B2 (en) 2014-06-24 2015-06-22 Thermoform packaging machine and method
ES201530735U ES1140983Y (en) 2014-06-24 2015-06-22 THERMOCONFORMING PACKING MACHINE

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US20150367971A1 (en) 2015-12-24
ES1140983Y (en) 2015-09-30
ES1140983U (en) 2015-07-09
US10384820B2 (en) 2019-08-20
DE202015002847U1 (en) 2016-07-22
ES2644994T3 (en) 2017-12-01

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