EP0001536B1 - Verfahren und Vorrichtung für das Konditionieren in metallische Verpackungen - Google Patents

Verfahren und Vorrichtung für das Konditionieren in metallische Verpackungen Download PDF

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Publication number
EP0001536B1
EP0001536B1 EP78420004A EP78420004A EP0001536B1 EP 0001536 B1 EP0001536 B1 EP 0001536B1 EP 78420004 A EP78420004 A EP 78420004A EP 78420004 A EP78420004 A EP 78420004A EP 0001536 B1 EP0001536 B1 EP 0001536B1
Authority
EP
European Patent Office
Prior art keywords
containers
thermoforming
installation
process according
packaging
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP78420004A
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English (en)
French (fr)
Other versions
EP0001536A1 (de
Inventor
Robert Guedet
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.)
Societe de Conditionnement en Aluminium SCAL GP SA
Original Assignee
Societe de Conditionnement en Aluminium SCAL GP SA
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Application filed by Societe de Conditionnement en Aluminium SCAL GP SA filed Critical Societe de Conditionnement en Aluminium SCAL GP SA
Publication of EP0001536A1 publication Critical patent/EP0001536A1/de
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Publication of EP0001536B1 publication Critical patent/EP0001536B1/de
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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
    • 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
    • B65B55/00—Preserving, protecting or purifying packages or package contents in association with packaging
    • B65B55/02—Sterilising, e.g. of complete packages

Definitions

  • thermoforming technique consists in carrying a thin-walled blank, most often a bucket or a simple flat sheet, at a high temperature below the melting temperature of the material considered, but sufficient to soften it and ensure it good plasticity.
  • the blank is then given the desired shape by applying it to the surface of a mold by the action of a pressurized fluid.
  • thermoforming with various metals such as alloys based on magnesium, aluminum, copper, titanium, stainless steel, nickel.
  • metals such as alloys based on magnesium, aluminum, copper, titanium, stainless steel, nickel.
  • aluminum we have even developed so-called special superplastic alloys.
  • demolding hot parts with thin walls presents significant difficulties. This demolding can be facilitated by coating the molds with a coating (clay and resin). It is also possible to coat the surface of the blank with a graphite oil. However, this requires, in particular for food containers, cleaning after removal from the mold. These are additional operations that increase costs and reduce manufacturing speed.
  • thermoforming has so far been limited to manufacturing in small series of complicated parts such as those for aviation or computer equipment.
  • metal containers are cold produced by methods such as stamping or winding of ferrule with welding and crimping of the bottoms. Metal surfaces should be cleaned and stripped before coating with varnish or lacquer. This production involves various operations of a chemical or mechanical nature, carried out at various rates which it is practically impossible to integrate into a packaging chain for consumable products.
  • the metal containers are currently manufactured in specialized factories from where they must be sent to the packaging lines with the need for intermediate storage. All these handling, load changes, storage, increase the cost of metal containers already higher by itself than that of plastic containers. Finally, if you want to use these containers for aseptic filling, they must be sterilized before filling.
  • German patent application DOS-2344620 to produce a packaging line in which containers made of composite materials are continuously produced in the line.
  • the containers are obtained by thermoforming a sheet of plastic material and simultaneous stamping of a metal sheet.
  • the internal face of the container is only brought to the thermoforming temperature of the plastic at most, a temperature certainly insufficient to obtain true thermal sterilization of the containers. It should be added that obtaining containers by the simultaneous implementation of techniques for thermoforming plastic and mechanical drawing of metal is certainly difficult.
  • thermoforming of aluminum alloy parts was possible at high production rates of the order of 1000 to 2000 pieces per hour, provided that it was limited to lengthening maximum of the order of 100% and with surface ratios between thermoformed part S and blank Sa of the order of: than the thermoforming of aluminum alloy containers of common qualities which can be perfectly integrated in a continuous packaging chain.
  • manufacturing by thermoforming according to the invention gives containers naturally sterilized by heat and directly delivered to the filling station without the risk of contamination during handling. They are particularly suitable for aseptic filling.
  • the surface of the containers manufactured by the process is, moreover, particularly suitable for receiving a layer of plastic material with excellent adhesion without any particular treatment or coating of glue.
  • the plastic coating is carried out at a temperature above 120 ° C. This gives directly coated and aseptic containers suitable for aseptic filling without requiring any specific sterilization treatment. tion. Just keep them in a sterile environment until filling.
  • the object of the present invention is a process which makes it possible to condition, under aseptic conditions, consumable products in metal containers manufactured continuously hot in an installation integrated into the packaging chain.
  • These containers are produced by thermoforming at a high temperature of between 0.7 Tf and 0.9 Tf, Tf being the melting temperature of the metal constituting the containers. This directly gives aseptic containers making unnecessary any sterilization operation of the containers before filling.
  • thermoforming of containers is done from aluminum sheets which generally have a thickness of between 0.10 and 0.50 mm. However, it is only economically advantageous with thin metal sheets, 0.10 to 0.20 mm thick. The mass and, consequently, the thermal interie of these containers is very low. They cool almost instantly upon leaving the mold. If you want to make a plastic coating by spraying particles onto the hot surface of the containers, care must be taken to keep them at temperature without relying too much on their own temperature when they come out of the mold.
  • the coating of plastic material can be in the form of electrostatic projection of fine filamentous particles which arrive, on the surface to be coated, in a substantially pasty state. They eventually reliquefy on the hot surface to solidify quickly afterwards while the entire container cools.
  • a sufficiently tight coating vis-à-vis aggressive products such as tomato sauce or sauerkraut
  • its thickness must be greater than 10 ⁇ .
  • the thickness of the coating will normally be between 10 ⁇ and 200 ⁇ .
  • plastics can be used such as polyester, polyproplylene, polyethylene.
  • the layer of alumina on the surface of the aluminum sheet must have a regular thickness greater than 0.01 ⁇ and, preferably, between 0.04 ⁇ and 0, 50 ⁇ . Thicker alumina layers of 1 ⁇ m and larger are not bothersome but more expensive.
  • the alumina layer can be formed by anodic oxidation or chemically and can then be in the form of boehmite. The oxidation installation can itself be integrated into the packaging chain. However, the addition of a chemical or electrochemical treatment in an already complex packaging chain will not always be desired.
  • Figure 1 schematically shows an integrated packaging chain comprising the manufacture and filling of trays formed directly from aluminum foil.
  • FIG. 2 schematically represents an installation for coating plastic material by an electrostatic process.
  • FIG. 1 we can see an aluminum sheet, quality 8011, which moves in the direction of arrow F in a discontinuous advance movement from a roller (1).
  • This aluminum sheet (2) 0.14 mm thick is first subjected to anodic oxidation in an aqueous solution of sulfuric acid according to a known process, this in the installation shown diagrammatically in (3). This treatment generates a porous surface layer of alumina with a thickness of 0.50 ⁇ .
  • the sheet (2) then passes into a thermoforming installation consisting of a preheating oven (4) and a heated mold (5), made of steel.
  • the sheet is preheated in the oven (4) then passes into the mold (5) brought to about 580 ° C.
  • the temperature of the sheet (2) itself hardly exceeds 470 ° C.
  • trays (6) are formed by 4 at a time at a rate of 10 per minute, or 40 trays per minute. These trays have an opening of 150x135 mm with a depth of 35 mm.
  • the trays formed (6) would cool rapidly on leaving the mold due to their low mass if they were not reheated. They pass directly into an installation (7) where they are maintained at a temperature of the order of 180 ° C. and are coated with a protective layer of polypropylene according to the process described in more detail below.
  • these trays are aseptic. Provided they are kept in an aseptic enclosure, they can be immediately filled with pharmaceutical or food products without any cleaning or sterilization treatment. This is carried out in a filling station (8) then in a heat seal (9). The trays (6), full and heat sealed, are cut into (10) and then removed directly by a conveyor (11) to a shipping station.
  • the coating of the trays (6) with a thin continuous layer of polypropylene with a thickness of 50 ⁇ is carried out in the installation (7) according to the method shown in FIG. 2.
  • the cold polypropylene in the pulverulent state is stored in a hopper (12) made of insulating material. From this hopper (12), it falls on an endless chain preferably in the form of a grid made up of almost contiguous elements (13).
  • Fixed bars (14) arranged in the hopper (12) constitute a set of electrodes and electrically charge the polypropylene particles which pass through them.
  • the elements (13) of the endless chain are brought to an electric potential of opposite sign and thus attract particles passing nearby which adhere to their surface. The particles are entrained by the elements in direction (f).
  • the elements (13) loaded with polypropylene powder pass a heating installation (16) where the polypropylene liquefies while continuing to adhere to the elements.
  • the trays (6), at 180 ° C, integral with the sheet (2) pass in front of the elements (13) by moving in the direction of the arrow (F).
  • An electrode (17) creates an electric field from the elements (13) to the trays (6).
  • the power consumed is of the order of 5 A at 5 V.
  • the hot polypmpylae flows in the direction of the electric field in the form of fine filamentous particles with a diameter of 10 microns and a length of about 50 microns.
  • the plates (6) are maintained at 180 ° C by an appropriate heating device.
  • the particles arrive in a substantially pasty state on contact with the hot metallic surface. They do not form a fibrous layer with a felted texture. On the contrary, the plastic material is distributed over the hot surface, in a very uniform manner, in the form of a continuous layer of thickness approximately 50 ⁇ which quickly solidifies as soon as the trays (6) leave the heated zone. Coated and aseptic trays are thus obtained very directly from a metal sheet and finely divided plastic material without any cleaning and sterilization operation.
  • An integrated chain is thus produced comprising the production of the trays, filling with consumable product, closing and, possibly, final treatment of the product without any load break. Any treatment for cleaning the trays (6) before coating with a plastic coating is avoided, any cleaning and sterilization of the coated trays before filling.
  • the adhesion of the polypropylene layer is greatly facilitated by the relatively thick layer of alumina on the surface of the trays.
  • the covers are themselves coated with polypropylene by a process analogous to that shown in FIG. 2. The heat sealing of these covers aseptically coated is extremely easy, the polypropylene of the tray (6) being welded onto the polypropylene of the cover.
  • the coating (7) of plastic material is unnecessary and the filling in the trays (6) is done immediately after thermoforming (5).
  • the anodic oxidation of the sheet (2) is carried out in the packaging installation itself but, in many cases, it will be advantageous to use sheets (2) previously oxidized at the supplier d 'aluminum.
  • thermoforming temperature in the mold (5) must be adjusted accordingly.
  • the thermoforming temperature is 520 ° C. and the mold temperature (5) will be adjusted to approximately 620 ° C.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Wrappers (AREA)

Claims (10)

1. Verfahren zur Konditionierung von verzehrbaren Erzeugnissen unter aseptischen Bedingungen in metallischen Behältern, die kontinuierlich in der Wärme in einer in der Konditionierungskette integrierten Anlage hergestellt werden, dadurch gekennzeichnet, dass man die Behälter durch Warmverformen bei einer erhöhten Temperatur zwischen 0,7 Tf und 0,9 Tf herstellt, wobei Tf die absolute Schmelztemperatur des die Behälter bildenden Metalls ist, was direkt aseptische Behälter ergibt und jeden Sterilisierungsvorgang der Behälter vor Füllung unnötig macht.
2. Verfahren zur Konditionierung nach Anspruch 1, dadurch gekennzeichnet, dass man die Behälter aus einer Aluminiumfolie einer Dicke von 0,10 bis 0,50 mm, die mit einer künstlichen Aluminiumoxidschicht überzogen ist, herstellt.
3. Verfahren zur Konditionierung nach Anspruch 2, dadurch gekennzeichnet, dass die Aluminiumfolie eine Dicke von 0,10 bis 0,20 mm aufweist.
4. Verfahren zur Konditionierung nach Anspruch 2, dadurch gekennzeichnet, dass die Aluminiumoxidschicht eine regelmässige Dicke von 0,01 µm bis 1 um und vorzugsweise von 0,04 f.Lm bis 0,50 µm aufweist.
5. Verfahren zur Konditionierung nach einem der Ansprüche 1, 2, 3 oder 4, dadurch gekennzeichnet, dass die Verpackungen bei einer Temperatur über 120°C mit Kunststoff überzogen und danach bis zur Füllstation in steriler Umgebung gehalten werden.
6. Verfahren zur Konditionierung nach Anspruch 5, dadurch gekennzeichnet, dass das Überziehen mit Kunststoff in Form eines Spritzens von feinen Teilchen bei etwa ihrer Schmelztemperatur erfolgt.
7. Verfahren zur Konditionierung nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die Verpackungen während der Zeit des Überziehens mit Kunststoff auf einer der Schmelztemperatur des Kunststoffs wenigstens gleichen Temperatur gehalten werden.
8. Vorrichtung zur Durchführung des Verfahrens zur kontinuierlichen Konditionierung nach einem der Ansprüche 1, 2, 3 oder 4, dadurch gekennzeichnet, dass die Konditionierungskette eine Anlage zum Warmverformen von Behältern aus oberflächlich oxidierten Aluminiumfolien aufweist.
9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass im Anschluss an die Warmverformungsanlage (4-5) eine Anlage zum Überziehen mit Kunststoff bei einer Temperatur über 120°C vorgesehen ist.
10. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, dass im Anschluss an die Anlagen zum Warmverformen (4-5) und zum Überziehen mit Kunststoff (7) eine Anlage zum Füllen (9) unter aseptischen Bedingungen vorgesehen ist.
EP78420004A 1977-09-23 1978-08-17 Verfahren und Vorrichtung für das Konditionieren in metallische Verpackungen Expired EP0001536B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7729408A FR2403935A1 (fr) 1977-09-23 1977-09-23 Procede de conditionnement en emballages metalliques
FR7729408 1977-09-23

Publications (2)

Publication Number Publication Date
EP0001536A1 EP0001536A1 (de) 1979-04-18
EP0001536B1 true EP0001536B1 (de) 1981-01-07

Family

ID=9195936

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78420004A Expired EP0001536B1 (de) 1977-09-23 1978-08-17 Verfahren und Vorrichtung für das Konditionieren in metallische Verpackungen

Country Status (12)

Country Link
US (1) US4224779A (de)
EP (1) EP0001536B1 (de)
JP (1) JPS5456589A (de)
AT (1) AT365100B (de)
CA (1) CA1109310A (de)
CH (1) CH624629A5 (de)
DE (1) DE2860419D1 (de)
DK (1) DK411778A (de)
ES (1) ES473607A1 (de)
FR (1) FR2403935A1 (de)
IT (1) IT1098470B (de)
LU (1) LU80269A1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2530983B1 (fr) * 1982-07-27 1985-06-14 Cebal Procede de fabrication d'emballages pour produits consommables par thermoformage d'ebauches minces a base d'aluminium
US4625275A (en) * 1984-04-03 1986-11-25 Republic Money Orders, Inc. Apparatus for dispensing money orders
WO1993025451A1 (en) * 1992-06-16 1993-12-23 Sankyo Company, Limited Wrapper and method of manufacturing the same
SE508747C2 (sv) * 1992-10-07 1998-11-02 Tetra Laval Holdings & Finance Sätt att framställa invändigt sterila, skål- eller bägarformiga behållare
US5343672A (en) * 1992-12-01 1994-09-06 Scherer Ltd R P Method for manufacturing freeze dried dosages in a multilaminate blister pack
US5370831A (en) * 1992-12-18 1994-12-06 United Technologies Corporation Method of molding polymeric skins for trim products
US8758669B2 (en) * 2008-06-30 2014-06-24 Ethicon, Inc. Method and device for forming pre-made pouches
US20100323641A1 (en) * 2009-06-22 2010-12-23 Qualcomm Incorporated Method and apparatus for using pre-distortion and feedback to mitigate nonlinearity of circuits

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2712717A (en) * 1948-03-18 1955-07-12 Mason Keller Corp Packaging machine and method
US3244082A (en) * 1962-05-21 1966-04-05 Jerome H Lemelson Packaging machinery
DE1268042B (de) * 1965-04-28 1968-05-09 Hamac Hansella Ges Mit Beschra Vorrichtung zum Einsiegeln von kleinen Gegenstaenden wie beispielsweise Tabletten zwischen zwei Aluminiumfolien
GB1153886A (en) * 1965-09-23 1969-05-29 British Iron Steel Research The Deposition of Powder Coatings on Strip Material
US3430411A (en) * 1966-11-25 1969-03-04 Jacques Honore Gaspard Ollier Manufacture of yogurt and similar filled containers
US3865610A (en) * 1972-05-24 1975-02-11 Electrostatic Equip Corp Coating method with precure and apparatus therefor
SE423517B (sv) * 1972-08-11 1982-05-10 Tetra Pak Dev Sett att under aseptiska betingelser forpacka sterilt fyllgods i behallare
JPS5025879A (de) * 1973-07-16 1975-03-18
DE2344620A1 (de) * 1973-09-05 1975-03-20 Hassia Verpackung Ag Verfahren und vorrichtung zur herstellung von tiefziehverpackungen
SE389078B (sv) * 1974-04-29 1976-10-25 Aerlund & Rausing Ab Forfarande och anordning for forpackning av en livsmedelsprodukt i angatmosfer
JPS50161427A (de) * 1974-06-21 1975-12-27

Also Published As

Publication number Publication date
ES473607A1 (es) 1979-04-01
CH624629A5 (de) 1981-08-14
IT1098470B (it) 1985-09-07
EP0001536A1 (de) 1979-04-18
DE2860419D1 (en) 1981-02-26
ATA686278A (de) 1981-05-15
US4224779A (en) 1980-09-30
FR2403935B1 (de) 1980-04-04
DK411778A (da) 1979-03-24
IT7827832A0 (it) 1978-09-19
FR2403935A1 (fr) 1979-04-20
JPS5737488B2 (de) 1982-08-10
LU80269A1 (fr) 1979-06-01
AT365100B (de) 1981-12-10
CA1109310A (fr) 1981-09-22
JPS5456589A (en) 1979-05-07

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