EP0604507A1 - Recipient pour l'emballage de produits alimentaires, et procede et dispositif de fabrication d'un tel recipient. - Google Patents

Recipient pour l'emballage de produits alimentaires, et procede et dispositif de fabrication d'un tel recipient.

Info

Publication number
EP0604507A1
EP0604507A1 EP92919580A EP92919580A EP0604507A1 EP 0604507 A1 EP0604507 A1 EP 0604507A1 EP 92919580 A EP92919580 A EP 92919580A EP 92919580 A EP92919580 A EP 92919580A EP 0604507 A1 EP0604507 A1 EP 0604507A1
Authority
EP
European Patent Office
Prior art keywords
plastic
shell
cardboard blank
cardboard
container
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
EP92919580A
Other languages
German (de)
English (en)
Other versions
EP0604507B1 (fr
Inventor
Sylvia Dietrich
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.)
Individual
Original Assignee
Individual
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
Priority claimed from DE4130905A external-priority patent/DE4130905A1/de
Application filed by Individual filed Critical Individual
Publication of EP0604507A1 publication Critical patent/EP0604507A1/fr
Application granted granted Critical
Publication of EP0604507B1 publication Critical patent/EP0604507B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
    • B65D25/14—Linings or internal coatings
    • B65D25/16—Loose, or loosely-attached, linings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2565/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D2565/38—Packaging materials of special type or form
    • B65D2565/381—Details of packaging materials of special type or form
    • B65D2565/385—Details of packaging materials of special type or form especially suited for or with means facilitating recycling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2577/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks, bags
    • B65D2577/10—Container closures formed after filling
    • B65D2577/20—Container closures formed after filling by applying separate lids or covers
    • B65D2577/2025—Multi-layered container, e.g. laminated, coated

Definitions

  • Containers for packaging food method for producing such a container and device for carrying out this method
  • the invention relates to a container for the packaging of foodstuffs, with a thermoformed plastic tray and a cover, preferably welded, that is firmly connected to the top side via a flange section in the form of a plastic composite film, according to the preamble of claim 1
  • the invention further relates to a method for producing a food container according to the preamble of patent claim 19 and an apparatus for carrying out a method for producing a food container according to the preamble of patent claim 27.
  • Packaging containers of the type described in the introduction are used and used in particular for foods which, owing to their easy perishability, are particularly useful during transport and storage against external influences, such as, for. B. must be protected from excessive temperature or light influences.
  • These containers must therefore not only be sufficiently dimensionally stable and preferably stackable, but also be such that the goods contained in the container are preferably hermetic to the environment, in particular to an acidic Substantive atmosphere is shielded.
  • a further important criterion for these containers is the fact that the manufacture or processing of the container and the filling can be carried out simply, preferably with a space-saving, linearly arranged production system.
  • These production systems have the advantage that they can be constructed in a modular manner, so that the individual workstations can be put together individually, depending on the container to be produced, and can thus be used economically.
  • a conventional container of this type usually consists of two. Parts, namely a deep-drawn plastic shell with an upper edge flange and a cover welded to it in the form of a plastic composite film.
  • This plastic composite film regularly has a carrier material layer made of, for example, axially stretched polyamide or polyester, a carbon dioxide or oxygen barrier layer made of ethylene vinyl alcohol (EVOH) and a sealing layer for sealing the cover with the rest of the shell, the sealing layer usually consists of a polyethylene-plastic system.
  • the container base ie the deep-drawn plastic shell of the container, is also made from a plastic composite film in the case of higher-quality packaging.
  • dimensionally stable films are used, for example polystyrene-based films with a thickness in the range between 700 and 1000 ⁇ .
  • the polystyrene base layer in turn carries a barrier layer made of an ethylene-vinyl alcohol system and a polyethylene sealing layer facing the cover, which can be thermally welded to the cover.
  • These films are suitable for both negative and positive deformation with and without mechanical pre-stretching of the film. In this way, container shapes of different designs and strengths can be produced with machines that are relatively easy to control, and the retrofitting of the Packaging system when switching from one product to another can proceed relatively quickly.
  • PVC polyvinyl chloride
  • German patent 1 036 153 a device for the manufacture of flat packs is described, which consist of thermoplastic coated paper, which is cut and folded in such a way that there are also lateral, outwardly bent upper packaging edges, over which a cover sheet made of plastic is then welded all around in a sealing station.
  • a protective gas such as, for. B. carbon dioxide is required.
  • Carbon dioxide has a volatility which is about 4 times higher than that of oxygen. Easily perishable goods can therefore not be stored in a package according to DE-PS 1 036 153.
  • the method known from this document cannot be combined with deep-drawing systems of conventional Bauert,. without making drastic changes to the system here.
  • the plastic lining Since the connection between the plastic lining and the cardboard blank is only provided in the flange area, the plastic lining must also be made relatively stiff in this case, since the outside cardboard blank forms a reinforcement and can only be used to a limited extent to stiffen the container shell * . ' After all, this process requires a significant amount of cardboard. An integration of the process into conventional ones. Common packaging systems are also not possible.
  • a folded cardboard blank is also lined on the inside with a plastic system which then also forms the circumferential, angled flange for the attachment of a cover film.
  • the cardboard blank is designed in such a way that it is smaller in area than the outer surface of the drawn plastic film. The stiffening function of the cardboard blank is therefore also relatively limited in this known case.
  • a complete, stiffening sheathing of a trough-shaped plastic container with a cardboard reinforcement material blank is described in DE-PS 2 034 154.
  • a relatively complex tool is required.
  • the cardboard blank is folded into a negative form, which interacts with an upper stamp, by means of which a film web is then pressed into the mold.
  • a suction stamp is used to fold in the cardboard blank, which holds the cardboard blank firmly in the event of a relative movement between the suction stamp and the negative mold.
  • the invention is therefore based on the object of creating a container for the packaging of foodstuffs according to the preamble of claim 1, which is characterized in that the amount of non-recyclable or non-recyclable material required for producing the container Plastic is significantly reduced, but at the same time, however, the highest tightness values are still ensured.
  • the structure of the container should also be such that it can be manufactured with conventional, preferably linear packaging machines according to the preamble of claim 27 with as little conversion effort as possible without impairing the performance of these packaging machines.
  • a further object of the invention is to create a method for producing such a container that is as simple as possible and that fits seamlessly into the course of the process in conventional packaging machines.
  • the previously used composite hard film made of polystyrene (PS) or polyvinyl chloride (PVC) is replaced by a soft film composite, ie an extremely flexible composite film, which has a significantly lower surface stiffness compared to hard films.
  • This soft film composite is given its shape that stabilizes the container structure an erected cardboard blank, which is inserted into the very thin-walled composite film, which is shaped into a shell, in such a way that it flatly stiffens the soft film composite. Because the cardboard blank is provided with a plastic coating on both sides, there is the advantage that the flat connection between the stiffening cardboard blank and the soft composite film brought into the form of a container is produced in a very short time, for example by a punctiform or flat surface.
  • the double-sided coating of the cardboard blank also ensures that box-like, spatially stable cardboard inserts can be produced with a high clock frequency from, for example, strip-shaped but also other blanks, even with a continuous blank base, in that the overlapping fold sections be thermowelded.
  • the processing of the cartons coated on both sides to form spatially stable container inserts with a spatially stable structure and circumferential wall collar can be carried out with such a high number of cycles that the carton blanks are produced in parallel with the processing of the soft composite film in a continuous deduction from a supply roll becomes.
  • the folded cardboard blank which has a spatially stable structure and is at least selectively thermally welded, can be handled just like a tray insert with a relatively robust gripper device and can accordingly be positioned exactly over the depressions molded into the composite soft film.
  • the risk of damaging the very thin-walled soft film composite when inserting the cardboard blank is reduced, in particular if the edge regions of the tray insert or the erected cardboard blank have a chamfer surface that is at an obtuse angle to the adjacent wall surfaces .
  • the measures according to the invention make it possible to work with a soft film composite system which only has a thickness in the range between 150 and 200 ⁇ m. In this way, the amount of plastic in the packaging that can no longer be reprocessed can be reduced to around 20% compared to conventional containers.
  • plastic coating of the cardboard blank can be made extremely thin-walled, for example with a thickness of about 12 ⁇ m, so that this packaging plastic waste is negligible. When using a cellulose or wood pulp bowl, this additional plastic portion is completely eliminated.
  • the structure of the container according to the invention is independent of the tightness of the shell insert or cardboard cut used with the circumferential collar wall, particularly in the
  • the container according to the invention is therefore also suitable for packaging processes in which the interior of the packaging is evacuated and / or, if necessary, back-gassed after filling with a stabilizing medium.
  • the result is extremely high-quality packaging, with only a fraction of non-recyclable plastic.
  • Suitable additives to the cellulose or ground wood pulp, which are then pressed into the shell inserts, can be used to take specific account of the food technology requirements, in particular the moisture resistance.
  • the construction of the container according to the invention benefits from the use of a very economical manufacturing process. If - according to a further development of the invention - the cardboard blank inserted into the molded trough of the composite film is obtained from a strip-shaped material, an opening is regularly obtained on the bottom side in the manufacture of the spatially stable cardboard blank insert which is advantageously used for this purpose can be used to stabilize the preformed soft film composite from above by an air flow during the insertion of the cardboard blank. The positioning accuracy of the cardboard blank in the preferably deep-drawn composite film can be additionally improved in this way and the risk of damage to the very thin-walled composite film is noticeably reduced.
  • the construction of the container according to the invention enables a manufacturing process that can be integrated seamlessly and without sacrificing performance in the process flow of commercially available packaging machines, as described at the beginning.
  • the linear structure of such packaging systems can be maintained according to the invention. It is only necessary to complete the step of filling the container with the goods to be packaged to precede, in which the cardboard blank stiffening the composite soft film is inserted into the preformed, preferably deep-drawn shape.
  • the device according to the invention for carrying out the manufacturing process for the more environmentally friendly food packaging can be obtained by simply retrofitting packaging systems already on the market. The throughput of the packaging system does not have to be reduced.
  • Compound foil can be used.
  • the remaining components of the conventional packaging system can be retained unchanged.
  • the construction of the container according to the invention opens up the possibility of reducing the amount of cardboard required to form the container to a minimum, which is ensured, for example, by obtaining the erected cardboard insert from a strip-shaped blank.
  • the cardboard insert consisting of a cardboard coated on both sides or the tray insert has a continuous bottom, from which the angled upward, circumferential side walls are angled. In this case there is no longer any risk that an uncoated cut edge of the carton comes into direct contact with the food to be packaged.
  • This measure also effectively prevents the outer appearance of the packaging in the area of the cardboard cut edge, for example wisely suffers from swelling due to moisture. This measure does not have to raise the weight of the packaging. This is because, owing to the more stable structure which is supported across the bottom of the blank, the cardboard can be made with a lower thickness.
  • the peripheral wall of the tray insert or the erected cardboard blank is preferably designed such that the container opens slightly conically upwards.
  • this measure simplifies the shaping process of the shell and it has the additional advantage that the outer composite film is subjected to as little mechanical stress as possible when the carton blank is being inserted and when it is subsequently sealed.
  • the outer layer of the soft film composite system is preferably made of a polyamide plastic, a pretreated, for example corona-treated polyethylene plastic with a high melting point, a polyester plastic. Fabric or a polypropylene system.
  • a polyamide plastic for example corona-treated polyethylene plastic with a high melting point, a polyester plastic.
  • Fabric or a polypropylene system The use of polyethylene for the outer layer brings additional price advantages. If a polypropylene system is used, the result is a composite that can be completely recycled without prior separation.
  • the sealing layer of the container is formed according to claim 7, the soft-film composite, which is not readily recyclable, can be separated very easily from the remaining part of the container. Nevertheless, a very stable connection can be made via the sealing layer and the plastic coating of the cardboard blank, for example by using a thermal welding process, so that the mechanical stiffening of the flexible soft film composite by the cardboard is long-lasting.
  • the barrier layer is still formed by an ethylene-vinyl alcohol (EVOH or EVAL).
  • EVOH or EVAL ethylene-vinyl alcohol
  • the structure of the container according to the invention opens up the possibility of changing the thickness of the container. Raising the ethylene vinyl alcohol layer in relation to the total thickness. As a result, the protective effect for the food can be improved without noticeably increasing the amount of non-recyclable plastic.
  • the stiffening effect of the is very good.
  • Carton blank insert for the thermoformed soft film can even be made from very simply designed, strip-like cardboard blanks which are formed with individually selected folds or fold lines.
  • the bottom flange, which is bent inwards, gives the carton insert a very good impression, even if the overlapped fold sections are only spot welded high torsional rigidity. Due to the flat connection of the cardboard insert with the outer wrapping made of the soft film composite, this torsional stiffness transfers directly to the deep-drawn soft film composite, which is thus reliably protected against overstressing or overstretching even with heavy packaging.
  • the choice of the cut of the carton can be used to influence the position and size of the opening on the bottom, which advantageously also takes place with regard to the goods to be packaged.
  • a cardboard blank with a continuous bottom is preferably selected, which then has an even higher load-bearing capacity.
  • the structure of the cardboard blank according to claim 8 therefore has the particular advantage of giving the container sufficient stability with a minimum of cardboard consumption.
  • the width of the base flange is preferably selected so that it lies in the range between 10 and 40% of the container width.
  • this edge flange can also be produced from a strip-shaped blank by thermowelding of folded-over fold sections which overlap in the folded form. The resistance of the container to twisting is additionally improved in this way.
  • the upper, peripheral edge flange offers protection for the edge of the deep-drawn soft film when inserting the cardboard blank.
  • the cardboard insert With a plastic coating of the cardboard blank according to claim 12, the cardboard insert can on the one hand be erected very easily and, on the other hand, in the erected form it can be economically produced into a warp-resistant structure, preferably thermowelded.
  • the plastic coating according to claim 12 forms a connection with the sealing layer of the soft-film composite system which is as secure as it is quickly producible and which is long-term stable even at low temperatures.
  • the container according to the invention is therefore also particularly suitable for deep-freeze packaging. Nevertheless, the cardboard blank can be easily separated from the soft film composite system after opening the container and after the packaged goods have been used, which further improves the environmental compatibility of the container according to the invention.
  • a very torsion-resistant container insert can be produced which, in combination with the composite film surrounding this insert, creates a container which is in no way inferior to the conventional container made of thermoformed composite hard film.
  • the double-sided coating of the carton blank ensures that the food does not come into contact with the carton material itself.
  • a recycling box i.e. an inferior carton can be used.
  • the cardboard coating is also preferably made of a peelable plastic, so that the consumer is able in a few steps to recycle the recyclable Separate components of the packaging from the non-recyclable components.
  • a particularly advantageous further development of the method according to the invention for producing the food container is the subject of claim 19. This further development makes it possible to make the packaging system very compact.
  • a further advantage of this embodiment is that the negative mold for the production of the indentations in the soft film composite can simultaneously be used for positioning the soft foil composite with respect to the tray inserts or cardboard blanks to be used. As a result, the working accuracy of the production process can be increased, and the risk of damaging the soft film composite system is already very small in that the shell insert is relatively smooth or smooth. the cardboard insert is plastic coated on both sides.
  • the method according to the invention of the flat stiffening of a soft film composite with a spatially stable, i.e. Rigid cardboard cutting can be carried out in various ways. It is possible, for example, to feed the cardboard blank in strip form and to produce the spatial cardboard structure only in the already deep-drawn composite film.
  • Advantageous, in particular with regard to the use of conventional packaging systems, is the further development of claim 20, according to which the cardboard blank is inserted into the plastic film, which has already been folded, into the shell shape.
  • the device for carrying out the method can consistently be carried out with conventional components of standard packaging systems. A closer look at the developments of the device according to claims 28 to
  • the device according to the invention is also suitable for the production of a plurality of containers in one work step and in one work station, which is the subject of claim 37.
  • FIG. 1 shows a schematic top view of a plant for the production of a food container according to the invention
  • Figure 2 is a schematic sectional view according to II-II in Figure 1;
  • FIG. 3 shows a schematic sectional view according to III-III in FIG. 1;
  • FIG. 4 shows the view according to IV in FIG. 3;
  • FIG. 5 shows the detail "V" in Figure 6
  • FIG. 6 shows a schematic sectional view according to VI-VI in FIG. 1 with a somewhat modified shape of the cardboard blank used;
  • FIG. 7 shows on an enlarged scale a section according to VII-VII in FIG. 1;
  • FIG. 8 shows the section according to VIII-VIII in FIG. 6 - rotated 90 ° - in the region of a side wall which is equipped with a device for forming stiffening beads;
  • 9 shows a perspective view of the lower tool half for receiving the cardboard blank
  • 10 is an enlarged partial sectional view of the sealed container in the area of the upper edge flange
  • FIG. 11 shows a perspective view of the upper mold corresponding to the lower mold according to FIG. 9;
  • FIG. 12 shows a first embodiment of a carton blank in the unfolded state
  • FIG. 13 shows a further embodiment of a cardboard blank in the unfolded state
  • FIG. 14 is a perspective view of a corner edge of the folded from the blank according to Figure 13
  • FIG. 15 shows a side view of a plant for carrying out the method according to the invention for producing a container
  • FIG. 16 shows a plan view of a further embodiment of a cardboard blank in the state before erection
  • FIG. 17 shows a perspective view of the carton blank in the erected state
  • FIG. 18 shows a detail of the view according to FIG. 17 in the region of a side edge
  • FIG. 19 shows a schematic sectional illustration in the area of the molding and work station according to a further variant; and 20 shows a top view of the packaging system according to FIG. 19.
  • the reference numeral 20 denotes a composite film wound on a roller, as it is offered on the market by the company "WALKI” in various versions with different protective properties.
  • This composite film is a soft film composite, for example with the following structure:
  • the outer layer forming a mechanical protective shield is formed, for example, from a polyamide, a pretreated, preferably corona-treated polyethylene, preferably with a high melting point, or a polyester plastic.
  • the thickness of this layer is 30 ⁇ m, for example.
  • This mechanical protective layer is followed by a barrier layer made of ethylene-vinyl alcohol (EVOH or EVAL), which is effective for oxygen and carbon dioxide.
  • EVOH or EVAL ethylene-vinyl alcohol
  • the upper layer facing in the illustration according to FIG. 1 is formed by a sealing layer, which is preferably formed by a peelable or peelable polyethylene plastic or plastic system.
  • the term "soft film composite" is to be understood in the following to mean a composite film which is flexible, i.e. is not stable in itself.
  • the wall thickness of this soft film composite is preferably in the range between 150 and 200 ⁇ m, the EVAL barrier layer having a thickness in the range between 4 and 30 ⁇ m and the sealing layer having a thickness in the range
  • the composite film 20 is pulled off, for example, in a width of approximately 400 to 500 mm from a roller 22 and fed to the linearly constructed packaging system, which largely contains work stations, as is the case with conventional packaging machines, for example from the "Multivac" company. are based.
  • the main stations of the packaging machine are described in more detail below:
  • a deep-drawing station in which the composite film 20 preheated by means of a heating device 32 is negatively deformed in the deep-drawing process.
  • a negative mold tool 34 which can be moved back and forth in the vertical direction (arrow B) is provided, in which four negative molds 36 are formed.
  • the negative molding tool 34 is therefore suitable for the simultaneous production of four deep-drawing operations.
  • the invention is not limited to the special arrangement and shape of the containers shown. Rather, any type of packaging and also of packaging groups can be produced by replacing the negative molding tool 34 in the area of the deep-drawing station 30 without departing from the basic concept of the invention.
  • Each negative mold 36 is connected via a line duct system 38 to a negative pressure connection 40, so that a vacuum can be generated in a time-controlled manner below the composite film 20 drawn over the negative molds 36, with which the composite film can be brought into the form shown in FIG Represents the outer shape of the later, finished food container.
  • FIG. 1 four indentations are introduced into the composite film 20 per tool stroke. The indentations are identified in FIG. 1 by the reference symbol 42.
  • the composite film or the soft film composite runs intermittently by means of a transport chain to a work station 50, in which - preferably in one operation - a corresponding number of torsionally rigid cardboard blanks 52 are inserted into the group of four of the indentations 42 .
  • the composite film In the area of this workstation, 20 is still connected over the entire surface, which is best shown in the illustration in FIG. 3.
  • the thin soft film composite 20 is not - emphasized in the illustration according to FIG. 3 - supported between the individual indentations by a guide rail.
  • the exact positioning of the indentations 42 in the work station 50 takes place with the aid of a lower tool part 54, which is guided to be movable in the vertical direction via columns 58 and has inner recesses 56 which form the negative for the final shape of the packaging to be produced.
  • the depth T of the inner recess 56 is equal to the dimension V of the indentation 42.
  • the remaining contour of the inner recess 56 also corresponds to the shape of the indentation 42, so that when the lower tool 54 is moved upwards, there is one flat, full contact of the composite film 20 on the lower tool 54.
  • the reference numeral 60 shows a transport and shaping stamp, hereinafter referred to as the transport plate, which is also mounted movably in the vertical direction and is held on a swivel arm 62 with a swivel axis 64.
  • the transport plate 60 has a number of projections in the form of positive molds 66 corresponding to the number of the inner recesses 56 below, with which cardboard blanks to be described in more detail below, brought into box-like form, can be transported from a folding station 70 to the work station 50 and into it Deformations 42 can be used.
  • the cardboard blanks 52 are obtained from a cardboard coated on both sides, which is wound on a cardboard roll 72.
  • the manufacture of the carton blanks 52 takes place synchronously and in time with the processing of the soft film composite 20.
  • 74 is a cutting device with which the carton web 76 is divided into strips 76-1 to 76-4. The number of strips corresponds to the Number of containers to be processed simultaneously in one work step.
  • the strips 76-1 to 76-4 subsequently run into a folding device 78, in which the individual strips are provided with such a cut and folding lines 80 that a cup-like cardboard insert is made from a single strip in a cardboard folding device 82 52 arises, which is held in position by the individual positive shapes 66 on the transport plate 60 in a defined manner.
  • the cardboard inserts 52 located on the underside of the transport plate 60 are only indicated by dashed lines, only two such cardboard inserts being shown for reasons of simplification.
  • a device 84 Upstream of the transport plate 60 is a device 84, in which the individual strips 86-1 to 86-4 which have been cut to length are erected in a box shape and are firmly connected to one another in the region of the overlapping fold sections, preferably thermowelded, so that at the outlet of the device 84 There are spatially stable, torsion-resistant cardboard cut-out inserts 52 which are gripped by means of the transport plate 60 and positioned precisely by means of a clocked, cyclical pivoting movement, which is indicated by the arrow S in FIG. 1, above the inner recesses 56 of the lower tool 54 of the work station can be positioned exactly.
  • the cardboard 76 is provided on both sides with a plastic coating which consists of a thermally weldable polyethylene plastic (PE).
  • PE polyethylene plastic
  • the thickness of this plastic coating is, for example, range between 10 and 15 ⁇ m and the arrangement is preferably such that the coating is easily peelable, ie peelable.
  • the core material of the coated cardboard 76 consists of so-called recycled cardboard and a basis weight in the range between 200 and 300 g / m 2 is preferably selected for the cardboard blank.
  • the folding of the cardboard strips 86 takes place in coordination with the shape of the positive mold 66 in such a way that the cardboard insert 52 surrounds the positive mold 66 in a form-fitting manner.
  • the height H of the cardboard insert essentially corresponds to the dimension V of the insert 42 or the depth T of the inner recess 56 in the lower mold 54.
  • a multiplicity of strip-shaped or rib-shaped pistons 90 arranged in rows are slidably slidably received in the side wall of the positive mold 66.
  • the control spaces 92 located behind these strip-shaped or rib-shaped pistons 90 are connected to a channel system 94. If the control spaces 92 are pressurized in a time-controlled manner via the channel system 94, the rib-shaped pistons 90 can extend slightly beyond the wall 98 against the force of return springs 96 and come into frictional engagement with the inner surface of the walls 88 of the erected card ⁇ tons 52.
  • This state of the strip-shaped pistons 90 is indicated in FIG. 11 on the side wall 98 facing the viewer, while the rib-shaped pistons 90 are shown in the adjacent side wall in the retracted position.
  • the cardboard inserts are formed from strips 86-1 to 86-4.
  • a structure is formed with a circumferential collar formed by the wall sections 88 and an open bottom 100 which is essentially at right angles thereto and which has bottom flanges 102 which are bent inwards is formed.
  • the width B102 of these flanges is an adjustable fraction of the total width W of the container.
  • a compressed air duct system 104 is provided in the transport plate 60 and the associated holder, with which an air flow indicated by the arrows 106 can be generated in a time-controlled manner.
  • the air flow emerges from the bottom end face of the positive molds 66 and is directed into the interior of the indentations 42, so that when the lower tool 54 is moved upwards, the deep contact of the deep-drawn composite film 20 on the inner wall of the recess 56 is promoted.
  • the compressed air duct system 104 can also be used to control the stroke movement of the rib-shaped pistons 90.
  • FIGS. 1 and 3 differ from one another insofar as the cardboard insert according to FIG. 1 is not only equipped with a bottom flange 102 but also with an upper edge flange 108 with an optional width B108. However, this top edge flange 108 is only beneficial if particularly heavy packaging is to be produced.
  • FIG. 4 shows this top flange 108 particularly clearly. Hatched areas 110 are indicated where folded fold sections of the cardboard blank overlap in the erected form. In these areas, there is preferably a flat or selective thermal welding instead. Since the cardboard is coated on both sides, a firm connection of these overlapping areas can be ensured in any case, regardless of the folding method.
  • FIG. 6 shows the position assignment between the lower tool 54 and the transport plate 60 as the upper tool shortly before the bottom dead center of the transport plate 60 is reached.
  • the lower tool 54 has already reached the top dead center.
  • the cardboard insert 52 lies together with the composite film 20 snugly against the inner contour 56 of the lower tool 54.
  • the positive molds 66 of the transport plate 60 are positively immersed in the indentations.
  • the cardboard insert 52 is thereby pressed flat against the composite film 20 both in the area of the wall sections 88 and in the area of the bottom flange 102 and - if present - in the area of the upper edge flange 108.
  • the upper flange 108 which may be present - see FIG.
  • a heating device designated 112 is actuated, so that in the area of the contact sections between the cardboard insert 52 and the composite film, spot or area welding occurs at the points 118. This welding covers the entire contact area between the cardboard insert 52 and the film 20.
  • the cardboard insert thus stiffens the flexible, i.e. flaccid soft film over a large area, so that the dimensional stability of the cardboard insert 52 is completely transferred to the soft film composite 20.
  • the inner recesses 56 in the lower tool part 54 are designed in such a way that the individual unit according to FIG. 9 can be removed.
  • a series of elongated depressions 116 are formed in wall surfaces 114, which, when the positive molds 66 are completely retracted, lie flush with the strip-shaped pistons 90. This state can be seen in the section according to FIG. 8.
  • the duct system 94 is pressurized with compressed air so that the rib-shaped or strip-shaped pistons 90 perform a full stroke outwards and the carton 52 together with the outer skin from the soft film composite 20 into the Press depressions 116 against the force of the return springs 96.
  • the springs 96 push the pistons 90 in question again.
  • the beaded shape of the side walls is retained and also contributes to an improvement in the areal connection between cardboard insert 52 and soft film composite 20.
  • FIG. 5 shows an enlarged representation of a section of the container immediately after the connection between the cardboard insert 52 and the soft film composite 20 has been completed.
  • This representation shows the multilayer structure of both the coated cardboard and the soft film compound.
  • 52-1 denotes the Core area made from recycled cardboard.
  • 52-2 indicates the coating films made of thermally weldable polyethylene (PE), which have a thickness of approximately 10 to 15 ⁇ m.
  • 118 denote those places at which a thermal seal is produced between the coating film 52-2 and a sealing layer 20-3 of the soft film composite 20.
  • the sealing layer preferably consists of peelable, ie peelable polyethylene (PE plastic).
  • 20-2 denotes the oxygen and CO 2 barrier layer made of ethylene vinyl alcohol (EVAL) and 20-1 denotes the outer layer forming the mechanical protection, which is either made of a polyamide, a pretreated, preferably corona-treated polyethylene with a high melting point or a Polyester plastic is formed.
  • EVAL ethylene vinyl alcohol
  • the indentations 42 braced in this way finally leave the work station 50 and are fed to a food loading station 120 and then to a sealing station 130.
  • the filling station 120 is not shown in the illustration according to FIG. 1, since this station does not differ from conventional filling stations.
  • a conventional composite cover film 132 runs into the system.
  • the cover film 132 is continuously removed from a roll 134 and fed via deflection rolls 136, 138.
  • the sealing station 130 also has a lower support tool 140 which interacts with a sealing plate 142.
  • the sealing plate 142 can be moved upwards and downwards and is partially heated in order to bring about a thermal welding between the cover film 132 and the sealing layer 20-3 of the soft film composite 20 at the areas VS shown in broken lines in FIG. 1.
  • FIG. 10 shows the state of the container after sealing.
  • This figure shows that the cover film 132, when the top flange 108 is present on the top, nestles around it and is thermally welded to the soft film composite 20 in the area VS.
  • FIG. 10 shows that the cover film 132 is also designed as a composite film, with a sealing layer 132-3 coming to lie opposite the sealing layer 20-3.
  • 132-2 is an oxygen and / or CO 2 barrier layer made of ethylene vinyl alcohol (EVAL).
  • EVAL ethylene vinyl alcohol
  • the sealing plate has correspondingly designed depressions 144 between which flat webs 146 remain which coincide with the sealing areas VS.
  • partial heating devices 148 are provided, which can also extend into the area of the top edge flanges 108. Additional devices, such as, for example, are not shown in the illustrations.
  • the individual containers After passing through the sealing station 130, the individual containers are connected to one another via the cover film 132 and the still connected soft film composite 20.
  • the filled and sealed containers then pass into a cutting device 150.
  • the containers are cut along lines that lie in the sealing areas VS. Such a parting plane is designated by a dash-dotted line in FIG. 10 with 152.
  • the cutting device 150 preferably has a longitudinal cutting knife 154 and a transverse cutting knife 156.
  • the containers 158 separated behind the cutting device 150 can then be removed and suitably packed.
  • FIG. 12 shows a cut cardboard strip with which a cardboard insert according to FIG. 4 can be produced. With dashed lines the fold lines are marked. The hatched areas represent the overlap regions in which the surfaces that overlap are thermally welded in order to produce a torsionally rigid spatial structure.
  • FIGS. 13, 14 An embodiment of the cardboard strip cut, with which an edge flange 108 ′ running around the top side can be produced, is shown in FIGS. 13, 14.
  • the thick lines represent the margins of the cut or cut lines.
  • the thin lines are fold lines.
  • the blank according to FIG. 13 is folded in the area of the corners as can be seen in the perspective illustration according to FIG. 14.
  • the intermediate folding line 164 delimits an outwardly folded flap, which is preferably pivoted into a wall plane of the erected insert and thermally welded to this surface.
  • FIG. 15 shows an overview again of a side view of the system according to the invention for producing a food packaging. Those stations in the system that correspond to the previously described work stations are identified by identical reference numerals. In this overall view, a filling station designated 120 can be seen going beyond the representation according to FIG. The feed point of the cover film 132 can also be seen in detail.
  • the illustration according to FIG. 15 shows that the system according to the invention for producing the containers differs from a conventional packaging system only in terms of the work station 50. The remaining stations 30, 120, 140 and 150 can be taken over from a conventional system in an identical configuration, if necessary with slight elm constructions. The concept of container production according to the invention even allows stations 30 and 50 to be combined to form a unit Z, which results in a very compact system.
  • FIGS. 16 to 18 show further embodiments of the invention, namely further configurations of the double-sided plastic-coated cardboard blank stiffening the shell.
  • FIG. 16 is a schematic plan view of an embodiment of the carton blank in the unfolded state. In Figure 16, only one half of the cardboard blank is shown. The axis of symmetry of the carton blank designated 252 is designated 254. The thin lines in FIG. 16 represent fold lines 280, which are preferably pre-embossed in order to allow the cardboard blank to be erected either in a separate work station or in the deep-drawn composite film in a short time.
  • FIG. 17 shows the cardboard blank in the erected state.
  • the carton blank 252 is not formed by a cardboard strip, but by a flat structure, so that a container with a continuous bottom wall 256 is formed after erection. This makes the container more dimensionally stable, so that the wall thickness of the cardboard can be further reduced.
  • this design has the advantage that no uncoated area of the cardboard blank is directly exposed to the substrate to be packaged. The use of a cardboard blank according to FIGS. 16 and 17 is therefore particularly appropriate when substrates that are moist or have a higher fat content are to be packed free of contamination.
  • Overlap areas of the folded wall sections are designated by 210. In these Areas are preferably punctiform or flat thermowelding, which can be achieved with simple measures due to the double-sided coating of the cardboard blank.
  • the cardboard blank according to FIGS. 16 and 17 is designed in such a way that sharp edges are avoided in the erected state.
  • Chamfer surfaces 258 are formed in the area of the corner edges, which are at an obtuse angle to the adjacent side surfaces 250. In this way, the risk of damage to the thin-walled, deep-drawn composite film is effectively countered when inserting the cardboard blank 252.
  • Figure 17 also shows that the cardboard blank is selected so that the cardboard blank opens slightly upwards.
  • the side walls 250 are slightly tapered upwards. This measure also effectively counteracts overstressing of the thin-walled, deep-drawn composite film either when inserting the cardboard blank and / or during the final sealing process.
  • Reference number 260 denotes a further fold line which gives the side walls 250 a locally limited flexibility in the region of the bottom edge, so that overstretching of the deep-drawn composite film can also be excluded in this region.
  • the cardboard blank according to FIGS. 16 and 17 can be handled in the same way and inserted into the deep-drawn composite film drawer, as has been described with reference to the exemplary embodiments described above. This method is therefore no longer to be described in connection with this embodiment.
  • the cardboard blank according to FIGS. 16 and 17 can be provided with a cut-out 262 indicated by dash-dot lines. The cutting edge which arises at the edge of the punched out can be thermally sealed during the punching process, so that even in this case the inserted substrate cannot come into direct contact with the carton, which usually absorbs water.
  • FIG. 352 A further embodiment of a cardboard blank 352 is indicated in FIG.
  • the special feature of this card blank is that the lower corner edges are also flattened or blunted. Accordingly, an upper chamfer surface 358 adjoins a lower chamfer surface 368. With this configuration, the insertion of the cardboard blank 352 is further simplified, wherein the risk of damage to the thermoformed composite film can be further reduced even under thermal stress.
  • FIGS. 19 and 20 A particularly advantageous embodiment of the device for producing the container according to the invention is shown in FIGS. 19 and 20. With this device, it is possible to integrate the units for deep-drawing the soft film and for inserting the stiffening shell into a conventional hard film packaging system in a space-saving manner and with a minimum of conversion work. Those components which are functionally comparable to components of versions already described are provided with similar reference numerals in FIGS. 19 and 20, which is increased by "400".
  • the soft film 420 runs into the molding station, ie into the deep-drawing station 430, and is heated there by means of a heating plate 432, which is located above a modular molding insert 434.
  • the thermoforming station is immediately adjacent arranged the work station, ie the tray insertion station 450, which in turn has a modular insert 454.
  • Both modules 434 and 454 preferably have a common carrier via which a synchronous lifting movement is initiated.
  • the common carrier can be taken over from the conventional hard film packaging system without reconstructions.
  • a transport and fixing stamp 460 for the trays or cardboard blanks 452 to be inserted cooperates with the module 454 after the module has completed its working stroke HSP and the stamp 460 has been inserted into the mold.
  • FIG. 20 shows that the transport and fixing stamp 460 has to perform a simple pivoting movement by only 90 ° in order to transport the shell inserts into the mold. This keeps the number of cycles high.
  • Other kinematic devices can of course also be used.
  • FIG. 19 only represent the situation schematically.
  • the film runs from the work station 450 with deep drawing and inserted shell inserts to a sealing and sealing station 530, in which the top film 532 fed in via a deflection roller 538 runs in, as indicated in FIG. 15.
  • a sealing and sealing station 530 in which the top film 532 fed in via a deflection roller 538 runs in, as indicated in FIG. 15.
  • the sealing station is simplified since the sealing plate can have a simpler shape. If an angled edge flange of the cardboard blank or insert is not provided, the design of the heating devices is also simplified, since they then no longer have to cover the area covered by the edge flange.
  • the device can also be modified such that the feed device for the erected cardboard inserts is separated from the upper mold in the work station, i.e. from the form stamp.
  • the construction of the container described above results in a food packaging which, as can best be seen in FIG. 10, forms an envelope which is impermeable to oxygen and CO 2 on all sides.
  • the manufacturing process kept as simple as possible, whereby conventional packaging systems can be used with the same clock frequency and with the least possible conversion effort.
  • the invention thus creates a container for the packaging of foodstuffs, with a thermoformed shell made of plastic and a cover in the form of a plastic composite film that is welded around the top via a flange section.
  • the shell (42) is formed by a thin-walled, inherently non-area-stable soft-film composite system (20) and on the inside at least in the area of the shell wall preferably opens slightly conically upwards, either by means of a dimensionally stable shell insert containing cellulose or wood pulp or by a cardboard blank (52) which is plastic-coated on two sides and stiffened to the shell (42) at least at discrete points (118).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Abstract

Récipient pour l'emballage de produits alimentaires, pourvu d'une coque en plastique emboutie et d'un couvercle constitué d'une feuille en plastique composite soudée à une partie du rebord supérieur de ladite coque. Pour que la compatibilité avec l'environnement dudit emballage soit améliorée et que, simultanément, sa fabrication au moyen de machines d'emballage classiques soit simplifiée, ladite coque (42) est un système (20) composite à feuilles souples, lui-même non rigide, à paroi mince, renforcé au moins dans la région de la paroi de la coque qui, de préférence, s'évase légèrement en direction du bord supérieur, soit par une pièce rigide contenant de la cellulose ou contenant de la pâte mécanique ou par une pièce de carton (52) recouverte sur ses deux côtés de plastique et soudée au moins en des points discrets (118) à ladite coque (42).
EP92919580A 1991-09-17 1992-09-17 Recipient pour l'emballage de produits alimentaires, et procede et dispositif de fabrication d'un tel recipient Expired - Lifetime EP0604507B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE4130905A DE4130905A1 (de) 1991-09-17 1991-09-17 Behaelter fuer die verpackung von lebensmitteln, verfahren zur herstellung eines solchen behaelters und vorrichtung zur durchfuehrung dieses verfahrens
DE4130905 1991-09-17
DE4218998A DE4218998A1 (de) 1991-09-17 1992-06-10 Behälter für die Verpackung von Lebensmitteln, Verfahren zur Herstellung eines solchen Behälters und Vorrichtung zur Durchführung dieses Verfahrens
DE4218998 1992-06-10
PCT/EP1992/002148 WO1993006016A1 (fr) 1991-09-17 1992-09-17 Recipient pour l'emballage de produits alimentaires, et procede et dispositif de fabrication d'un tel recipient

Publications (2)

Publication Number Publication Date
EP0604507A1 true EP0604507A1 (fr) 1994-07-06
EP0604507B1 EP0604507B1 (fr) 1996-06-05

Family

ID=25907403

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Application Number Title Priority Date Filing Date
EP92919580A Expired - Lifetime EP0604507B1 (fr) 1991-09-17 1992-09-17 Recipient pour l'emballage de produits alimentaires, et procede et dispositif de fabrication d'un tel recipient

Country Status (3)

Country Link
EP (1) EP0604507B1 (fr)
AT (1) ATE138865T1 (fr)
WO (1) WO1993006016A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9119450B2 (en) 2012-12-21 2015-09-01 Novartis Ag Contact lens package
WO2022013491A1 (fr) * 2020-07-17 2022-01-20 Sipalax 2 Barquette destinée à contenir une denrée alimentaire

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITBO20010045A1 (it) * 2001-01-30 2002-07-30 Ipack S R L Contenitore per alimenti e relativo motodo di realizzazione

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Publication number Priority date Publication date Assignee Title
GB1133947A (en) * 1965-04-30 1968-11-20 Hassia Verpackung Ag Improvements in or relating to packaging containers and methods and apparatus for production thereof
FR2404567A1 (fr) * 1977-10-03 1979-04-27 Impression Cartonnage Ste Pari Emballage en carton revetu de matiere synthetique
US4257530A (en) * 1978-07-27 1981-03-24 Champion International Corporation Lined tray
FR2480708A1 (fr) * 1980-11-07 1981-10-23 Impression Cartonnage Ste Pari Contenant en carton plie revetu d'une pellicule en matiere synthetique et muni d'un cadre peripherique en une seule piece ainsi que son procede de fabrication

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9306016A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9119450B2 (en) 2012-12-21 2015-09-01 Novartis Ag Contact lens package
WO2022013491A1 (fr) * 2020-07-17 2022-01-20 Sipalax 2 Barquette destinée à contenir une denrée alimentaire

Also Published As

Publication number Publication date
WO1993006016A1 (fr) 1993-04-01
ATE138865T1 (de) 1996-06-15
EP0604507B1 (fr) 1996-06-05

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