Classifications

• • 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
  • B21D51/00—Making hollow objects
  • B21D51/16—Making hollow objects characterised by the use of the objects
  • B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
  • B21D51/44—Making closures, e.g. caps
  • B21D51/50—Making screw caps
• • 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
  • B21D51/00—Making hollow objects
  • B21D51/16—Making hollow objects characterised by the use of the objects
  • B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
  • B21D51/44—Making closures, e.g. caps
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49826—Assembling or joining
  • Y10T29/49885—Assembling or joining with coating before or during assembling
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49826—Assembling or joining
  • Y10T29/49906—Metal deforming with nonmetallic bonding
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/4998—Combined manufacture including applying or shaping of fluent material

Definitions

• the invention relates to the field of closure capsules or overcap capsules, and typically metal capsules based on aluminum or tin.
• the invention relates more particularly to a method of manufacturing these capsules.
• Metal corking caps typically made of aluminum, are typically manufactured as follows:
• a stamping press forms blanks of capsules made from varnished strip metal on its two faces, with a typical thickness ranging from 0.21 to 0.25 mm,
• these blanks are degreased in an oven at a high temperature, typically from 180 ° to 210 ° C., for a time ranging from 3 to 5 minutes, in order to eliminate the drawing lubricant,
• these lacquered blanks are printed on the skirt, typically in offset, with a final drying of the inks in an oven, an overprint varnish is finally applied to the printing in order to protect it, said varnish being dried during a transition to oven
• the blank thus obtained is provided with a seal and / or a threaded internal plastic insert.
• PROBLEMS POSED Regarding metal caps, whether capping or overcapping, there is a permanent demand both to reduce production costs, under penalty of seeing these capsules replaced by other capsules more economical under the same conditions. 'another technology and another material, and to improve the sets and their wear of use. The invention aims to solve both problems simultaneously.
• the method of manufacturing metal capsules comprises: a) a supply of metal in strips or in format, typically coated on both sides with a layer of stamping varnish, b) a step of stamping, in one or more passes, said metal strip or format, typically using a stamping lubricant, so as to form a stamped blank comprising a head and a skirt, typically axi-symmetric in an axial direction (10), c) a degreasing step of said stamped blank, intended to typically eliminate the residues of stamping lubricant, to form a defatted preform to be lacquered, d) a step of lacquering said blank degreased, said lacquered blank thus obtained being then optionally decorated, e) a possible finishing step, and is characterized in that, during said degreasing step c), said blank blank ie is subjected to a treatment of emission of an energetic radiation chosen in intensity and duration to eliminate or degrade said residues of lubricant, said treatment
• said treatment is carried out at ambient temperature, which is extremely advantageous both with regard to energy savings and with regard to the disadvantages of softening the metal, and other on the other hand, it is realized in masked time insofar as it can be implemented while being associated with all or part of a decoration step, and this without slowing down the rate of said decorating step, so that said step of degreasing is not in itself a step, so it is a very economical implementation operation.
• FIG. 1b is an axial sectional view of an electrode used in the method according to the invention.
• FIGS. 2a and 2b schematically and partially illustrate the degreasing station (53) of the skirt (12) of the blank (1) of FIG.
• Figure 2a is a section along the axis of rotation (530) of the support (53 ') of the blank (1).
• Figure 2b is a section in a plane perpendicular to the axis of rotation (530).
• Figures 3a and 3b schematically and partially illustrate the station (52) for degreasing the head (11) of the blank (1) of Figure la.
• Figure 3a is a section along the axis of rotation (520) of the support (52 ') of the blank (1).
• Figure 3b is a top view of the head (11), the electrode (40, 40 ') having been shown in dashed lines.
• said energy radiation treatment may be a treatment comprising the formation of a plasma or an ionic or electronic efflux.
• Said treatment may be a treatment typically using a high electric field, typically at least 5 kV, and a high frequency current, typically at least 10 kHz.
• said treatment can be carried out using two strips or electrodes (40) for transmitting said corona, a lateral electrode (40 "), typically parallel to said skirt (12) , intended to reach and process said skirt (12), and a front electrode (40 '), substantially perpendicular to said lateral electrode (40 ") and parallel to said head (11), for reaching and treating said head (11) ).
• said electrodes (40, 40 ', 40 ") may comprise an electrically conductive metal core (41) covered with a dielectric ceramic layer (42).
• this type of electrode (40) is particularly adapted to treat the outer metal surface of the stamped blanks (1), to remove its residues of shaping lubricant, and then to allow the attachment of a lacquer.
• the Applicant has been able to observe that the treatment according to the invention, both under high voltage and at a high frequency, carried out at ambient temperature and at ambient air, was both economical with the low energy consumed, the installed power being about 500 W, reliable, not very dangerous in its implementation, and not very aggressive for the metal because, with the electrodes used, the emission emitted is regularly distributed over the whole length of the electrode in view of the capsule (1), so that there is no risk of "breakdown" with a point of passage of a localized current that could punctually damage said blank (1).
• said treatment can be performed by virtue of a potential difference between said electrodes (40, 40 ', 40 ") and said stamped blank (1), typically ranging from 10 at 30 kV, so as to form said high electric field, said electrodes (40, 40 ', 40 ") being brought to a potential of 10-30 kV and said blank (1) being grounded or at a zero potential, said potential difference serving to regulate said intensity of said treatment, said electrodes (40, 40 ', 40 ") being at a distance d from the surfaces of said blank (1) to be treated less than 4 mm.
• said lateral electrode (40 ") can be arranged parallel to a generatrix of said skirt (12), so that, by rotation of said blank (1), the entire said skirt (12) is subjected to the energy radiation emitted by said lateral electrode (40 "), in a constant manner over the entire height of said skirt (12).
• Said rotation of said blank (1) can extend over 1 to 2 turns, for a time at most equal to 1 second, said blank rotating on itself, having been placed on an arm or stud (52 ', 53' ) rotating on itself along an axis of rotation (520, 530).
• said treatment can also be a so-called "cold” plasma treatment, typically carried out at atmospheric pressure.
• the treatment can be carried out at ambient temperature, typically on the run, and without requiring a particular gaseous atmosphere, so as to limit investment costs and operating costs.
• Said lubricant may comprise a volatile organic solvent and a lubricating compound capable of rapidly degrading under the action of said treatment.
• Said compound may be a paraffin oil.
• said lacquering step may comprise a so-called spraying step in which the entire surface of said degreased blank is spray-covered or lacquered by spraying or spray application, so as to form a lacquered blank (3).
• Said spraying step may be followed by a first so-called "dust-off" drying, at a temperature below 100 ° C., and typically at a temperature of 80 ° C, for a time typically less than 2 minutes, so that said lacquered blank (3) can then be directly decorated or printed.
• a time ⁇ t shorter than 15 minutes, typically less than one minute, and possibly less than 10 seconds may have elapsed.
• said lacquered blank (3) can be printed, typically by screen printing but possibly by offset or flexography, on its skirt (12) and possibly on the head (11), then subjected to a second drying, typically at a temperature of 140 ° C, for a time typically less than four minutes, so as to obtain a printed capsule.
• a raised pattern can be formed on said head (11) of said blank (1, 2, 3) or said printed capsule, said relief pattern being typically formed in using a punch and die set bearing said pattern.
• Said strip or format metal may be aluminum, typically of the 8000 series, in a state typically ranging from the 1/4 hard state to a 3/4 hard state, and at a thickness of 0 , 18 mm to 0.30 mm, and preferably from 0.21 mm to 0.25 mm.
• Said finishing step may include, typically in the case where said capsule is a closure cap, at least one of the following complementary means:
• said electrode (40, 40 ', 40 ") can be a cylindrical electrode with an outside diameter typically ranging from 15 mm to 20 mm, and length ranging from 100 to 150 mm. with a metal core (41) of length 50 to 90 mm, said electrode (40, 40 ', 40 ") comprising an outer sheath or layer of dielectric ceramic (42) having a thickness of 0.5 to 3 mm.
• said electrode (40, 40 ', 40 ") can be placed at said distance d from said blank (1), that is to say, either of said head (11), or of a generatrix of said skirt (12), said distance d ranging from 0.2 to 4 mm, and typically from 1 mm to 2 mm
• d 1.5 mm.
• Another object of the invention is formed by capping capsules formed by the process according to the invention.
• Another object of the invention is formed by overcap capsules formed by the process according to the invention.
• Another object of the invention is constituted by a use of the process according to the invention for forming capping capsules or caps for overcoupling.
• this device (5) can comprise a mobile support for said blanks, typically a plate (50) rotating about an axis of rotation (50), typically step by step, and provided with a plurality of stations. or stations with levitation means or arms (51 ', 52', 53 ', 54', 55 ') of said blanks (1), said plurality of stations or stations comprising:
• degreasing station 51, 52 of said blanks (1), said blanks (1) being rotated on themselves facing fixed degreasing electrodes (40, 40 ', 40 ") at a distance d predetermined, said electrodes (40, 40 ', 40 ") being supplied with a current of predetermined frequency and voltage capable of generating a destructive emanation of the residues or residues of lubricant, said blanks (1) being grounded, so as to obtain stamped and degreased blanks (2), an ejection or unloading station (56) of said degreased blanks (2).
• Said degreasing station may comprise two treatment stations, a first station (51) for treating said head (11) of said preform (1) to be degreased (1) and a second station (52) for treating said skirt (12). ) with typically a separate treatment of said head (11) and said skirt (12) of said blank (1) to degrease (1).
• Said plurality of stations or stations further comprises, after said degreasing station or said degreasing stations, a lacquering station (54) and a drying station (55).
• the continuous processing device (5) according to FIGS. 1a and 1b has been developed. Upstream, this device was fed, at the station (51), blanks (1) such as outputs of the stamping press. These stamped blanks (1) were formed from aluminum strip varnished on both sides, the stamping having been made with a lubricant forming a solution of a mineral oil in an alcoholic medium.
• the degreasing treatment was carried out either with STT (type SG2) fixed frequency (40 kHz) and variable power from 0 to 715 W, or with a Softal (type 3003) device with a variable frequency between 16 kHz and 40 kHz, and 4 power positions (366 W, 426 W, 493 W and 500).
• STT type SG2
• Softal type 3003
• the STT device was used at 50% of its power, ie 350W, while the Softal device was used with a power of 500 W.
• An electrode (40, 40 ', 40 ") with a useful length of 70 mm was used, as illustrated in FIG.
• the degreasing device (4) comprises, as illustrated in FIG. 1a, a high-voltage, high-frequency current generator (44), a fixed support (45) for the electrodes (40), and the electrodes (40 ', 40). ”) arranged so that at each fraction of a turn or not the turntable (50), a blank (1) is positioned at the distance d of the electrodes.
• the degreasing treatment time was 0.55 seconds, the blank (1) making from 1 to 2 turns on itself.
• the distance d was set at 1.5 mm.
• a plasma is formed on the surface of the blank (1) to be treated, and this at room temperature and ambient air. Such a plasma can be observed visually laterally by the presence of a light emission forming a homogeneous blue layer covering the treated metal surface.
• the blanks (1) are placed on studs (51 ', 52', 53 ', 54', 55 ', 56') rotating on themselves at certain stations (52, 53, 54, 55) about axis rotation (520, 530, 540, 550). Taking into account the experimental parameters, it was calculated that the electrical energy received by the blanks (1) amounted to 7.8 J / cm 2 with the STT device and 4 J / cm 2 with the Softal device.
• the blanks Downstream of this device (5), the blanks have also been subjected to different types of finishing: formation of a relief, typically on the head (11), but possibly on the skirt (12) of the blank (2, 3) or the final capsule, or formation of means for facilitating a first opening, means comprising at least one weakening line.
• This device (6) has been used to manufacture caps and caps closure caps closure caps having a seal or a threaded insert.
• the invention has great advantages. Indeed, firstly, the method according to the invention avoids expensive treatments in investment and operating costs, particularly with regard to the energy consumed.
• this method avoids any adoûciss ⁇ me fù ⁇ metaf constituting the initial metal blank and any loss of its mechanical characteristics. In view of this, it has thus been possible to reduce the thickness of the metal blank by 5 to 10%.
• the invention makes it possible to avoid bulky equipment, so that the treatment according to the invention corresponds to both an investment cost, and to a minimal occupied volume, which makes it possible to have a very large production workshop. compact, besides said processing can be performed in masked time and continuously, so that it does not introduce specific production costs, the cost of energy consumed being negligible.
• Electrode holder 40, 40 ', 40 "45 Processing device 5 Turning tray stepping 50 Axis of rotation 500 Station or loading station of 1 51 Plot support of 1 51' Station or processing station of 11 52 Plot support of 1 52 'Rotating axis 520 Substation or processing station 12 53 Plot bearing 1 53' Rotating axis 530 Substation or lacquering station 2 54 Plot bearing 2 54 'Rotating axis 540 Substation or drying station 55 Plot support 2 55 'Rotation axis 550 Station or ejection station 3 56 Plot support 3 56' Ground 57 Plasma 58
• Lacquering device 6 Spray nozzle 60 Feed pipe 61

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
• Lining Or Joining Of Plastics Or The Like (AREA)
• Manufacturing Of Micro-Capsules (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

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• 2004
  • 2004-05-06 FR FR0404885A patent/FR2869820B1/fr not_active Expired - Lifetime
• 2005
  • 2005-05-02 ES ES05763703T patent/ES2301034T3/es not_active Expired - Lifetime
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  • 2005-05-02 WO PCT/FR2005/001091 patent/WO2005120743A1/fr not_active Ceased
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• 2006
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