EP0101391A1 - Verfahren zum Herstellen von Verpackungen für Konsumgüter durch Thermoformen von dünnen Ausgangsfolien aus Aluminium - Google Patents

Verfahren zum Herstellen von Verpackungen für Konsumgüter durch Thermoformen von dünnen Ausgangsfolien aus Aluminium Download PDF

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Publication number
EP0101391A1
EP0101391A1 EP83420128A EP83420128A EP0101391A1 EP 0101391 A1 EP0101391 A1 EP 0101391A1 EP 83420128 A EP83420128 A EP 83420128A EP 83420128 A EP83420128 A EP 83420128A EP 0101391 A1 EP0101391 A1 EP 0101391A1
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EP
European Patent Office
Prior art keywords
blank
mold
thermoforming
aluminum
temperature
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.)
Withdrawn
Application number
EP83420128A
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English (en)
French (fr)
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.)
Albea Tubes France SAS
Original Assignee
Cebal SAS
Societe de Conditionnement en Aluminium SCAL GP SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cebal SAS, Societe de Conditionnement en Aluminium SCAL GP SA filed Critical Cebal SAS
Publication of EP0101391A1 publication Critical patent/EP0101391A1/de
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure

Definitions

  • the present invention relates to a method of manufacturing packaging for. consumable products by thermoforming thin blanks of aluminum or aluminum-organic multilayer materials.
  • the term aluminum without further specification, includes both the aluminum itself and the common aluminum alloys known in French standard AO2 104 under the designation 2002, 3003, 4047, 7020, 8011, 5754 and excludes special alloys such as so-called superplastic alloys.
  • multilayer aluminum-organic materials means all the complex products which combine an aluminum foil with at least one organic form in the form of one or more sheets of varnish, paints or films, or a combination of these various materials.
  • Thermoforming means a technique very similar to that well known and very commonly used in the plastics industry. It consists in carrying a thin-walled blank, most often a simple flat sheet, or even a preformed blank, at a temperature below the melting point 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 combined or not with a mechanical effect. For blanks with a wall that is sufficiently malleable at the forming temperature, it is also possible to use simple atmospheric pressure by creating a vacuum between the blank and the surface of the mold.
  • the periphery of the metal blank is held in place by clamping between the edges of a two-part mule, without being deformed. This tightening ensures the seal between the inside and the outside of the mold. Only the portion of the blank located opposite the hollow (or raised) part of the mold undergoes plastic deformation by elongation of the metal wall in all directions, without there being any sliding of the periphery of the blank clamped between the edges of the two-part mold.
  • thermoforming process can also be used for the production of parts in aluminum (or in common aluminum-based alloys) other than parts in superplastic alloys.
  • thermoforming is carried out by bringing the blank to temperatures between 0.7 Tf and 0.9 Tf and, preferably, close to 0.8 Tf, by means of radiant electrical panels and by deforming it in a mold whose temperature is about 100 ° C higher than that of the blank.
  • the deformation rates of the blank under the pressure of the fluid, whether or not combined with a mechanical effect, are relatively rapid, of the order of 1 to 10 seconds.
  • the aluminum used is not superplastic, we must be content with linear elongations of the wall of the blanks of the order of 100% instead of 1000 to 2000% and surface ratios S 1 / S O around 1.5 instead of 4 for superplastic alloys.
  • the relationship between depth and width of deformations obtained is of the order of 0.2 to 0, 3 only.
  • thermoforming of aluminum poses significant problems at the time of demolding because the hot molded part adheres to the surface of the mold also heated, this in particular at its periphery in the part which is clamped between the edges of the mold in two. parts. Also, is it necessary, to facilitate demolding, to coat the surface of the blank or that of the mold with suitable lubricants. However, this leads to pollution of the surface of the trays obtained, hence the need for cleaning or pickling before filling. It is also possible, as explained in European patent 1 198, to use aluminum blanks coated with an adherent layer of artificial alumina obtained by prior oxidation by electrolytic or chemical route.
  • This coating phase can reduce the rate of the packaging chain and, in any case, requires an additional operating phase and the maintenance of the tray in an aseptic medium during the transfer from the tray to the coating device.
  • the object of the present invention is to remedy these defects by proposing a process for manufacturing clean and / or aseptic packaging intended for the packaging of consumable products by thermoforming in a mold of thin blanks of aluminum which is neither lubricated nor chemically treated or made of materials. multilayer aluminum-organic products, in which the blank is brought to the deformation temperature and sanitized by the Joule effect.
  • This process is also characterized by the fact that or uses an unheated mold whose temperature of the internal wall is maintained at a constant value between ambient and 100 ° C.
  • the aluminum allows the aluminum to be brought quickly to a temperature between 150 and 600 ° C., the value chosen being fixed as a function of the thickness and the quality of the aluminum used. It can be applied either before the blank is introduced into the mold, or during the deformation operation, either by a combination of the two possibilities.
  • the mold is no longer heated to a temperature 100 ° C higher than that necessary for the deformation but, on the contrary, its internal wall is maintained by any suitable means at a constant temperature included between ambient and 100 ° C.
  • thermoforming it is possible to extend thermoforming to materials in which aluminum is associated with organic products. Indeed, with the Joule effect, it is no longer necessary to bring the assembly to a temperature at least equal to that necessary for thermoforming as one would be obliged to with an external heating, but only aluminum. As, moreover, the mold is relatively cold, the temperature reached by the organic matter remains low. This temperature can furthermore be lowered using a cooled thermoforming fluid.
  • blanks of multilayer materials can be subjected directly to thermoforming and there is no longer any need to coat the tray with an organic product after its deformation.
  • the heating by Joule effect also allows asepticization of the assembly so that one can proceed immediately to the filling of the tray without resorting to the various conventional asepticization methods and carried out by passage through baths of hydrogen peroxide or peracetic acid for example, products the content of which must be carefully checked before filling due to their harmful action on living organisms.
  • Joule heating has other interesting repercussions.
  • the mold being no longer heated, it is possible to use for its manufacture insulating materials which have little affinity for aluminum and organic products and this eliminates the risks of sticking.
  • Such a process can be combined with the thermoforming of blanks formed by pre-cut formats or shapes as well as blanks formed by strips which pass through the mold continuously.
  • thermoforming installation consisting essentially of a mold in two elements made of insulating material, in this case fine silica particles agglomerated by araldite.
  • the mold could also be made of other materials such as refractory concrete, syndanio, etc.
  • the upper planar element (3) is integral with a movable plate (4) capable of moving vertically under the 'action of a jack (5) and come to apply on the lower element (1) and seal the mold hermetically (1-3).
  • the movable plate (4) is guided by four vertical columns (6).
  • the edges (7-8) of the lower (1) and upper (3) elements of the mold are smooth to ensure better sealing and less adhesion with the blank (9) stretched horizontally between the two elements (1-3) of the mold.
  • the rim (7) forms a fillet (10) with the internal vertical wall of the element (1).
  • the lower element (1) has an orifice (12) placing the interior of the mold in communication with the ambient atmosphere; the upper element (3) is traversed by a pipe connected to a source of compressed air (13) and opening into the mold by an axial orifice (14).
  • electrical contact devices are essentially fixed consisting of transverse copper bars (15-16) arranged symmetrically and connected to the two terminals of a low voltage electrical circuit (4 V for example), not shown.
  • the bars (15-16) are mounted on two insulating bakelite supports (17-18).
  • each of the bars (15-16) there are two similar bars (15'-16 ') also mounted on insulating supports (17'-18') integral with two jacks (19-20) which, at on demand, bring them down to be applied to the lower bars (15-16) by pinching the blank (9) and passing an electric current through it between the bars (15-16).
  • FIG 2 which shows a horizontal section of the lower part of the installation, there are bars (15) and (16) mounted on their insulating supports (17) and (18), these assemblies being held by columns (22) and (23).
  • the blank (9) having been thermoformed has a rim (24), a periherical rib (25) which has formed at the level of the fillet (10) and a bottom (26).
  • FIG 3 has been drawn, in vertical section, the tray obtained with this installation and which has a bottom (26), a vertical wall (27), a rib. (25) which stiffens the edge (24).
  • This tray has a height h which is a function of the thickness of the movable bottom (21) which is introduced inside the lower element of the mold.
  • a continuous blank is seen in the form of a strip (28) which moves in the direction of the arrow F in a discontinuous advance movement from a roller (29).
  • This strip not preheated, passes directly into the thermoforming installation (30) consisting of at least one cold mold.
  • the train of aseptic trays, which comes out of the mold, is conveyed through an aseptic enclosure (31) to a filling station (32) then of heat-sealing (33).
  • the full and closed trays are cut in (34) and evacuated directly at the outlet by a conveyor (35) to a shipping station.
  • the strip can then be moved a length slightly greater than the length of the tray, then a new thermoforming operation is carried out while the trays formed pass successively through the filling, heat sealing, cutting stations before be picked up by a conveyor at the exit of the aseptic enclosure.
  • This chain allows with a single mold to obtain a production rate of 2000 trays per hour and which can be improved by advanced automation and a multiplication of molds or imprints.
  • the present invention finds its application in the packaging under suitable conditions of cleanliness and asepticization of products intended for consumption such as, for example, food products and pharmaceutical products.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
EP83420128A 1982-07-27 1983-07-20 Verfahren zum Herstellen von Verpackungen für Konsumgüter durch Thermoformen von dünnen Ausgangsfolien aus Aluminium Withdrawn EP0101391A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8213435A FR2530983B1 (fr) 1982-07-27 1982-07-27 Procede de fabrication d'emballages pour produits consommables par thermoformage d'ebauches minces a base d'aluminium
FR8213435 1982-07-27

Publications (1)

Publication Number Publication Date
EP0101391A1 true EP0101391A1 (de) 1984-02-22

Family

ID=9276524

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83420128A Withdrawn EP0101391A1 (de) 1982-07-27 1983-07-20 Verfahren zum Herstellen von Verpackungen für Konsumgüter durch Thermoformen von dünnen Ausgangsfolien aus Aluminium

Country Status (2)

Country Link
EP (1) EP0101391A1 (de)
FR (1) FR2530983B1 (de)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1016415A (fr) * 1950-04-18 1952-11-12 Procédé d'obtention de tous objets soufflés en polyéthylène par la méthode injection, préchauffage capacitif et soufflage
DE866373C (de) * 1949-12-04 1953-02-09 Lorenz C Ag Vorrichtung zum Biegen oder Abkanten von Folien aus thermoplastischem Material unter Verwendung eines hochfrequenten elektrischen Feldes zu seiner Erwaermung
US3342049A (en) * 1963-11-05 1967-09-19 Arthur J Devine Method of forming sheet metal without mechanical dies
FR2003058A1 (en) * 1968-03-01 1969-11-07 Union Carbide Corp Heat forming of thermoplastic foils using apparatus
FR2142727A1 (en) * 1971-06-24 1973-02-02 Ono Deforming thermoplastic sheet - by heating part of sheet and drawing out heated part
FR2403935A1 (fr) * 1977-09-23 1979-04-20 Scal Gp Condit Aluminium Procede de conditionnement en emballages metalliques
FR2442124A1 (fr) * 1978-11-27 1980-06-20 Tecca Procede thermodoseur et dispositif de sterilisation d'une bande thermoplastique destinee a la fabrication de recipients thermoformes
EP0001198B1 (de) * 1977-09-05 1980-08-20 Scal Societe De Conditionnements En Aluminium Verfahren zum Herstellen von Gegenständen aus Aluminium, Magnesium oder Legierungen auf Aluminium- oder Magnesiumbasis durch Warmverformung

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE866373C (de) * 1949-12-04 1953-02-09 Lorenz C Ag Vorrichtung zum Biegen oder Abkanten von Folien aus thermoplastischem Material unter Verwendung eines hochfrequenten elektrischen Feldes zu seiner Erwaermung
FR1016415A (fr) * 1950-04-18 1952-11-12 Procédé d'obtention de tous objets soufflés en polyéthylène par la méthode injection, préchauffage capacitif et soufflage
US3342049A (en) * 1963-11-05 1967-09-19 Arthur J Devine Method of forming sheet metal without mechanical dies
FR2003058A1 (en) * 1968-03-01 1969-11-07 Union Carbide Corp Heat forming of thermoplastic foils using apparatus
FR2142727A1 (en) * 1971-06-24 1973-02-02 Ono Deforming thermoplastic sheet - by heating part of sheet and drawing out heated part
EP0001198B1 (de) * 1977-09-05 1980-08-20 Scal Societe De Conditionnements En Aluminium Verfahren zum Herstellen von Gegenständen aus Aluminium, Magnesium oder Legierungen auf Aluminium- oder Magnesiumbasis durch Warmverformung
FR2403935A1 (fr) * 1977-09-23 1979-04-20 Scal Gp Condit Aluminium Procede de conditionnement en emballages metalliques
FR2442124A1 (fr) * 1978-11-27 1980-06-20 Tecca Procede thermodoseur et dispositif de sterilisation d'une bande thermoplastique destinee a la fabrication de recipients thermoformes

Also Published As

Publication number Publication date
FR2530983B1 (fr) 1985-06-14
FR2530983A1 (fr) 1984-02-03

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19840319

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Inventor name: GUEDET, ROBERT