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WO2001053160A2 - Godet, procede pour la mise a disposition d'un godet et procede pour l'etirage d'un godet en un contenant, ainsi qu'installations pour l'execution de ces procedes - Google Patents

Godet, procede pour la mise a disposition d'un godet et procede pour l'etirage d'un godet en un contenant, ainsi qu'installations pour l'execution de ces procedes Download PDF

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Publication number
WO2001053160A2
WO2001053160A2 PCT/CH2001/000036 CH0100036W WO0153160A2 WO 2001053160 A2 WO2001053160 A2 WO 2001053160A2 CH 0100036 W CH0100036 W CH 0100036W WO 0153160 A2 WO0153160 A2 WO 0153160A2
Authority
WO
WIPO (PCT)
Prior art keywords
cup
cylindrical
face
cups
indentations
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.)
Ceased
Application number
PCT/CH2001/000036
Other languages
German (de)
English (en)
Other versions
WO2001053160A3 (fr
Inventor
August Braun
Werner Boltshauser
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.)
Hueppi-Invest AG
Original Assignee
Hueppi-Invest AG
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 Hueppi-Invest AG filed Critical Hueppi-Invest AG
Publication of WO2001053160A2 publication Critical patent/WO2001053160A2/fr
Publication of WO2001053160A3 publication Critical patent/WO2001053160A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/14—Containers for dispensing liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant
    • B65D83/38—Details of the container body
    • 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
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • 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
    • B65D1/00—Rigid or semi-rigid containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material or by deep-drawing operations performed on sheet material
    • B65D1/22—Boxes or like containers with side walls of substantial depth for enclosing contents
    • B65D1/26—Thin-walled containers, e.g. formed by deep-drawing operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/732—Floor coverings
    • B29L2031/7322—Carpets

Definitions

  • Cup method for providing a cup and method for stretching a cup into a can, and equipment for carrying out these methods
  • the invention relates to cups according to the preamble of claim 1, to methods for producing cups according to the preamble of claim 5, to methods for stretching cups according to the preamble of claim 6 and to systems for carrying out these methods according to the preamble of claims 8 and 9.
  • the link to an apparently inviolable funding concept is particularly evident in the manufacture of extruded vessels, such as aerosol cans.
  • the manufacturing process begins with a press process of a press.
  • the raw containers or cans are cut and optionally brushed in a rough processing device.
  • the cans are then placed on mandrels of a chain conveyor and passed through a cleaning station with a washing and drying device. After cleaning, the cans are coated with lacquer on the inside in an internal lacquer device. To do this, each can must be removed from the mandrel of the chain conveyor, placed in a holding shell and then inserted into a sleeve-like, rotatable holder.
  • the interior paint is released from a nozzle that can be moved into the interior of the can while the can is being rotated. Afterwards, each can from the sleeve-like holder must be placed in an oven dish and passed through a first oven for drying before it is put back on a mandrel of a chain conveyor. Energy-intensive compressed air blasts are used to actuate the can movements along the axis of the can, which are necessary for interior painting.These compressed air blasts, the movements of the holding shells and the movements of the conveyor chain must be precisely synchronized with complex controls.
  • the holding shells, the sleeve-shaped holders and the furnace shells are adapted to the current can diameter and have to be replaced for the production of cans with different diameters, which leads to long downtimes
  • chain stores are provided, which reduce or increase the number of mandrels in a conveying section.
  • the outside processing station includes a primer, a printing and a top coat device.
  • the cans are opened from the chain put a mandrel on, coat it, put it back on the chain and put it through a drying oven. Due to the necessary movements of the can, essentially the same problems occur as with the interior painting
  • the pallet In order to prevent, without restricting the relative mobility on the front surface, that the connection surface unintentionally separates from the front surface or the box tilts with the pallet, the pallet is made of magnetizable material and the front surface is assigned permanent magnets or, if applicable, electromagnets, so that the Pallet adheres to the conveyor surface due to magnetic forces.
  • This arbitrary alignment is advantageous when transferring to processing stations and in particular also when processing in processing stations
  • the pallet must be connected to the can body by means of a connecting device and separated from it again at the end of the manufacturing process and returned to a pallet store
  • the individual processing steps can also be simplified in addition to the requirement, or optionally omitted or replaced.
  • a method is known from W095 / 34474 in which the cleaning, basic coating, printing and overpainting of the The outer surface of the vessel can essentially be dispensed with. The decor is printed on a foil and the foil is then applied to the outer surface of the vessel.
  • W095 / 34474 it was known for containers with simple geometric shapes, such as cylinders, it was known to subsequently glue on a decorative layer Neck part not to be possible, because the layer material must undergo this deformation when the neck part is deformed.
  • W095 / 34474 this is achieved by appropriate adaptation and selection of the foal material.
  • the film material will generally have at least the same or better elasticity as the can. material It is also possible to use conventional shrink films, ie plastics that shrink under the influence of heat
  • a solution is known from EP 0 525 729 A1, in which a decorative film is sealed to a beverage can.
  • the beverage cans are also rotated on a rotary table.
  • the film is wrapped somewhat overlapping around the can body to seal the film
  • a heatable sealing surface that runs parallel to the can axis is pressed against the overlap area of the film.
  • the films are at least partially damaged by the deformation tools and / or detached from the can jacket during the deformation
  • pull-in rings with different inner diameters are used for aerosol cans.
  • the pull-in rings are pushed onto the can in the direction of the can axis, starting with a pull-in ring with a large diameter, rings with ever smaller inner diameters are used which occur when the rings are pushed onto the can body Shear forces between the decorative film and the metallic can body are very large. Smaller narrowing of the open can end is known from the area of beverage cans because the diameter of the can lid is slightly smaller than the can diameter.
  • US Pat. No. 4,095,544 describes the production of a seamless steel can.
  • the cylindrical can body is produced in three steps from a steel sheet coated with tin.
  • a disc is produced with a stamping step provided with the desired diameter
  • a cylindrical bowl is formed with a pressing process, which is also referred to as a cylindrical cup by German-speaking experts.
  • a directly subsequent third step the cup is stretched into a cylindrical can body
  • Press stamps are arranged in tubular form around the ironing stamp and the corresponding outer retaining rings are arranged one above the other so that pressing and stretching can be carried out on the same machine.
  • the can body as already described for the aluminum cans, must be ge wash, varnish and dry several times
  • EP 0 666 124 A1 discloses a method in which the can body is produced from a steel sheet coated with polyester. For this purpose, a disk must be punched out of the coated sheet and pressed into a cylindrical cup. There is a risk of subsequent stretching and possibly smoothing , that the Plastic layer is damaged. In order to prevent damage, a polyester layer with biaxially oriented molecular chains should be used, in which the ratio of diffraction intensities at different intervals lies in predetermined ranges. During deep drawing or stretching, the cylindrical shell of the intermediate product is held between two ring-shaped parts and with a plunger, which is a smaller one
  • Diameter has drawn the desired length as the intermediate, or the cup. It has now been shown that when stretching with optimally shaped annular holding parts and the correspondingly dimensioned plunger, the thickness of the jacket is reduced without the polyester layer being destroyed. This means that there is also a polyester layer in the cylindrical can body that seals the steel sheet tightly.
  • a first ironing step - referred to as drawing in technical terms - further ironing steps - referred to as redrawing - must be carried out.
  • the plungers used one after the other in the ironing steps have a decreasing diameter from step to step, with excessively large differences in diameter during stretching leading to forceful and undesirably large material deformations in the can wall and possibly damage to the coating.
  • coated sheets are also available on the market, which can be pressed and ironed in suitable processing steps without damaging the coating and, if necessary, can also be smoothed.
  • These coated sheets are provided either by laminating a plastic film or, as described in WO98 / 52750, by directly extruding a plastic layer onto the sheet (see Protact, from Hoogovens Packaging BV, NL).
  • the can body can be printed, varnished, dried and deformed to accommodate the lid closure at the free end of the can.
  • the finished cans have to be stored temporarily and transported to the bottling plants. Because the finished or ready-to-fill cans are provided, only large series can be produced inexpensively. With the aerosol cans So many different diameters and can heights are required that the number of pieces required for an inexpensive series is often not achieved. This lack of flexibility is a disadvantage of the inexpensive manufacturing process
  • a solution is known from FR 2 213 816 and EP 0 031 254, in which a cup-shaped intermediate product with a conical wall is produced from a sheet at a first processing location and a final cylindrical can product is produced from the intermediate product at a second processing location
  • Conical cups have circular cross-sections perpendicular to the cup axis and are stacked into sets consisting of cups inserted into each other after manufacture. In the second system, the cups are stacked from the sets. Transport from the first to the second processing location can be space-saving due to the stackability disks are punched out of the sheet metal.
  • the sheet metal sections that are not used are obtained directly from the sheet metal manufacturer and can be recycled with little effort.
  • FR 2 213 816 specifies for the production of the stackable intermediate product that it is produced in a deep-drawing process with a protruding edge and a slanted wall produced
  • the process steps are the same as in the known processes, the known processes comprising the complex washing, drying and painting.
  • EP 0 031 254 mentions for producing the conical intermediate product female molded part and a press part interacting with it
  • a female jerk molded part and a corresponding pressed part are mentioned.
  • FR 2 213 816 sheets are assumed which can be deep-drawn into conical cups in accordance with EP 0 031 254 aluminum sheet is preferred, which can be pressed between a female and a male press part in a conical and then again in a cylindrical shape.
  • the object of the present invention is to find a solution with which can bodies, in particular aerosol can bodies, can be produced with little manufacturing effort, in particular also for small series
  • At least a portion of the jacket surface is inclined to the axis of the cup, the inclination of the jacket surface or the respective tangential surface relative to the axis preferably being at least 7 ° and thus being above the self-locking angle in order to enable unstacking at any angle, even at small angles , spacer elements, in particular stacking cams, are used
  • the stretching of cylindrical cups into cylindrical can bodies is known from the prior art.
  • the cylindrical wall material reaches a first annular deflection edge, in which the wall material of the cup is deflected radially inwards.
  • the deflection edges enable material deformations that are necessary for the desired flow or ironing behavior.
  • the stackable cups are brought into an essentially cylindrical shape before being stretched out of the stackable one. If conical cups with circular cross sections are now converted into a cylindrical shape with a pressing step, the necessary circumferential changes result in the same problems that have already been described above when forming a cylindrical into a conical cup with a circular cross section. In the course of a second inventive step, it was recognized that the stackable cup used had to be formed from a cylindrical cup, wherein essentially no changes in the thickness of the cup material and the coating should occur during the shaping.
  • the transition from the cup wall to the cup bottom is accomplished ts when the cup is stretched out with a sufficiently curved connection area from the cup wall to the cup bottom and / or the floor is arched to narrow the connection area.
  • the floor curvature is preferably directed toward the inside of the cup because a floor curve without If a spring tension is generated in folds, folds or indentations are formed in the floor in addition to or without a floor arch.
  • the indentations in the floor are preferably radial, their depth in the center of the floor disappears and increases towards the outside due to the formation of folds and the floor arch the cup is a shape that is similar to a Gugelhopf shape or a cup cake shape. Such a shape is stackable and at the same time enables the material thickness to be kept constant
  • the shape changes required to form the stackable cups without circular cross sections without material displacements within the layer material are simple Devices, in particular with forming presses with matching male and female pressed parts, or also with rollers that can be pressed against the inside and outside of the cup wall with interlocking teeth, can be achieved.
  • the processes for deforming a cylindrical cup into a stackable cup with folds and for reshaping a stackable cup with folds into a cylindrical cup can be used advantageously for all can materials.
  • these partial processes are also advantageous if the finished cans are still washed, dried and painted, that is to say also when using uncoated metal sheets, but the methods according to the invention are particularly advantageous when using flat material with a metallic layer which is at least on one side, but preferably on both sides, with plastic, in particular PET, Coated
  • the coated steel sheet can be stretched without adding oil, no complex cleaning and drying steps have to be carried out in the second system. Accordingly, the second systems can be designed simply and inexpensively, so that the transport is reduced baptism comes into its own and is not reduced by complex second systems
  • the first ironing step has to be carried out with high forces and thus with complex devices and the subsequent ironing steps can be carried out with simpler devices, it is possible to use the costly system parts in the first system and in the second systems only simple system parts Since the second systems can now be set up very easily, it is possible to provide the systems for producing the finished can bodies directly from the can buyers or filling systems starting from the stackable cups used. The transport effort for the finished cans can thus be reduced to a minimum without That the plant expenditure is particularly high If more can manufacturers are provided, they can use cost-effective plants with low throughputs. Accordingly, even small series can be produced very efficiently.
  • cup production preferably has a performance in a range of 1200 to 2000 cups / minute and the can production with an output of essentially 200 to 300 cans / minute should be designed accordingly.
  • a cup manufacturer should produce cups for 4 to 10 can manufacturers
  • the ironing press is, at least for high throughputs and with high ironing forces, a complex part of the system. If the forces required for ironing are not particularly high in the second system, the ironing press can be designed with a hydraulic cylinder or with a linear drive on a rotary table If an ironing device is assigned to the can location of the turntable, the ironing can be carried out on the turntable while the cup is rotating.
  • a decorative film can be arranged on the cylindrical outer compartment of the can body, which is preferably sealed with at least one essentially annular or with at least two, in particular more than two, partially annular sealing press surfaces in an annular sealing area on the can body, by the annular sealing area adjoining the open end of the cylindrical can body, it can be ensured that the decorative film in this area of victory is so well connected to the can jacket that the film also closes a subsequent deformation step to a standard opening, in particular for a valve receptacle, adheres to the can jacket undamaged.
  • the seal can also be understood as a connection of at least one layer of foal to the coating of the flat material.
  • the second system must include at least one further processing station for attaching the desired decorative film.
  • This further processing station is preferably equipped with a rotary table. In a first rotating area, the film is wrapped around the can body and, if necessary, a light one under the influence of heat Adhesion of the film to the can body is achieved. In order to seal the film to the can body, an annular, heatable sealing surface is pressed against the can jacket with the film in the area of the open end face of the cylindrical can body.
  • a sealing head with at least one essentially ring-shaped or with at least one ring head is pressed into each can area of the rotary table is assigned to two part-ring-shaped sealing press surfaces, these sealing surfaces can be held on the can in a predetermined turning range or during a given turning time for the movement through the turning range I have now shown that sealing of the film that can be achieved is sufficient to carry out the subsequent deformation of the open can end required for aerosol cans to form a neck part with a valve seat without damaging the film
  • a separating film inside the can.To do this, it is wrapped around a mandrel, closed in a bag or welded and inserted into the can body in order to hold it firmly in at least one
  • a heatable sealing surface is pressed from the inside against the can jacket with the separating film.
  • This inner sealing surface is designed analogously to an outer sealing surface. If a decorative and a separating film are arranged on the can body, a common one Sealing head, preferably cooperating inner and outer pressing surfaces and at least one heating device. Inner sealing surfaces are also preferably used for the assigned to a rotary table and rotated with the can bodies during the sealing process
  • At least one further processing station is provided, which preferably comprises a turntable, to which rotating necking, in particular spin-flow necking, devices are assigned.
  • the processing can be carried out during the rotating movement of the turntable If the processing tool and the can body are rotated relative to one another about the can axis in the spin flow neck devices, then either the can body or the processing tool must be able to be rotated relative to the rotary table about the can axis.
  • a peripheral roll device is preferably provided. This is assigned, for example, to the can locations of a second turntable of the processing station for deforming the open can end.
  • a monobloc aerosol can can be made from a coating hteten Flachmate ⁇ al be produced with an applied decorative film
  • the application of the decorative film and the subsequent shaping of the open can end can be adapted to different can heights without great conversion effort.
  • other sealing press surfaces or sealing heads must be used.
  • the roll with the printed decorative film can also be easily replaced.Therefore, small series with an extremely small one can be used Additional effort, or with essentially the same costs per can, as in large series, can be produced.
  • the inventive solution enables extremely flexible provision of cans. Because of the great flexibility and the simple processing parts of the second system, it is possible and advantageous to provide the To provide cans as part of the bottling system at the bottler In the simplest case, the bottler will then only need a space-saving warehouse with different sets of stacked cups.
  • a set with the rich term cup sizes for further processing If necessary, it is also appropriate to provide a bearing with already stretched cylindrical can bodies without decor. It goes without saying that that the second system can also be provided by a can manufacturer who supplies various fillers with cans, the cans each being provided with the corresponding decorative film
  • a system for aerosol cans can also be designed according to a completely new concept. It is about a new system concept for the production of containers made of sheet metal coated with plastic are and preferably include an outside, but possibly also inside, attached film on the can body.By eliminating the time-consuming processing steps of cleaning and drying, a system can be designed in which the entire production time for a vessel is very short the number of cans being processed is kept small, which in turn enables the entire conveying path in the system to be very short.
  • stop and go is preferably used as far as possible There is no need for stationary processing stations.Stop and go steps, or when transferring the cans being processed from a conveying area to a stationary processing area, impose speed limits, otherwise accelerations that are too high must be achieved with excessive forces for moving can bodies provided with movable processing stations
  • FIGS. 2a, 2b, 2c examples of cups used
  • FIG. 4 shows a schematic top view of processing stations connected in series for applying a decorative film and for deforming the open can end
  • 5 shows a schematic sectional illustration of a sealing head
  • FIG. 6a, 6b, 6c and 6d side views of intermediate products in a multi-stage ironing process for providing can bodies
  • FIG. 7 side view of a conical cup
  • FIG. 8 side view of a conical cup with small conicity and stacking cams
  • FIG. 10 schematic representation of sections of two nested ones
  • Cups Fig 1 1 perspective view of a cut cylindrical cup
  • Fig 12 perspective view of a cut cup with a
  • Cup cake form Fig 13-15 schematic representation of a section through a device for
  • FIG. 1 shows a two-stage manufacturing process, in which rod-shaped or core-shaped sets 4 are produced from inserted stacked cups 3 in a first system 1.
  • a second system 2 cylindrical can bodies 5 and 5 are produced starting from the rod-shaped sets 4 or the stackable cups 3 used Subsequently, ready-to-fill cans 6 are produced.
  • a flat material 7 with a metallic layer, in particular in the form of a steel sheet, is unwound and processed from a roll 8.
  • the metallic layer is preferably at least on one side, but in particular on both sides with at least one Plastic layer coated
  • Three polymer layers are preferably applied, with a layer adjacent to the sheet as the contact layer providing optimum adhesion, a main layer as a mechanically resilient layer and a surface layer as a layer with the desired surface properties if decorative foils are applied to the cans it is expedient to design the surface layer assigned to the film as a connecting or adhesive layer for the film
  • the flat material 7 is fed to a punching and manufacturing device 9.
  • the punching and manufacturing device 9 punches disks from the flat material and forms them with at least one tool in at least one receptacle to form stackable cups 3
  • the cups 3 pass through a continuation 10 into a stacking device 11 for stacking the pressed cups 3 in the form of rod-shaped or core-shaped sets 4.
  • the sets 4 are preferably stacked on pallet-like receptacles 12. In the form of the sets 4, the cups 3 can save space stored and in particular transported according to arrow 13 to the second system 2. It goes without saying that the second system 2 may also be arranged directly at the first system 1.
  • the two systems can be operated independently of one another the throughput of the first system 1 can be selected independently of the throughput of the second system 2 If the cups are now punched out and pressed by the sheet metal manufacturer, it is expedient to operate the punching and manufacturing device 9 with several tools acting in parallel and high clock frequencies when using punching - And manufacturing device 9 with 100-200 strokes n per minute and with flat material widths of approx. 1000 to 1200 mm, up to approx. 2000 cups per minute can be produced. As a result, the production costs for a cup can be kept very low.
  • the cups of a first system 1 with high throughput eg 2000 cups / minute
  • These second plants 2 have throughputs (eg 300 cans / minute) which are significantly lower than the throughput of the first plant 1
  • the second system 2 comprises a stacking device 14 for stacking cups 3 from a stack or from a set 4.
  • the separated cups 3 are fed to a shaping device 15, in which stackable cups 3 are used to form cylindrical can bodies 5.
  • the can bodies 5 are then preferably through An Ablangvor ⁇ chtung 16 for cutting the cylindrical can body 5 out
  • an intermediate storage in a storage device 17 is optionally provided. This storage is particularly advantageous in systems that are to produce many different sized cans, especially when small series are also desired If the bearing device 17 is dispensed with, the can bodies 5 go directly to the next processing station.
  • indentations 34 are provided in the jacket wall in cups 3 according to the invention. forms that the cup cross-section decreases from the open end side towards the closed end side, the peripheral portion of the indentations 34 increasing from the open end side towards the closed end side hm
  • FIG. 4 The further processing of the can body 5 to fillable cans 6 is also shown in FIG. 4, in the form of a schematic plan view. In this case, feeders 22 and further transfer turntables 21 are also shown
  • a decorative foal application device 18 follows, with which a decorative film is arranged on the cylindrical outer surface of the can body 5.
  • the decorative film is preferably unrolled from a decorative foil roll 19, separated and placed on the jacket of the Can body 5 applied
  • the decorative film applicator 18 is preferably designed as a processing station with a turntable 23 and an axis of rotation 18a.
  • the turntable 23 comprises rotatable can holders 24 at the can positions, which can be set in rotation in the desired manner by means of a control and a drive.
  • a heated contact surface or another may be required Heat supply provided around the decor
  • at least one sealing head with at least one essentially annular or with at least two partially annular sealing press surfaces is preferably provided.
  • the at least one sealing head is preferably arranged in this way on the application device 18 that he assigned a can body 5 rotates with the turntable and carries out the sealing during part of the rotary movement or for a predetermined time, the sealing head being movable towards and away from the can body in the direction of the can axis.
  • the sealing head makes the pressing surface Can be pressed onto the can body with a given force and the desired heat can be supplied to the sealing surface at a given temperature
  • the pressing elements 27 have a pressing surface 27a towards the can body 6 in the form of a partial surface of a cylinder jacket and a conical actuating surface 27b towards the outside guided in radial grooves 29a of a lifting element 29 for radial movements
  • spring elements 30 are arranged in the radial grooves 29a
  • Can body 6 moves Then the actuation ring 28 is moved against the can body 6, whereby the pressing elements 27 are pressed against the can body with their pressing surfaces 27a.
  • a heating device 31 is provided in the actuation ring 28 orderly
  • sealing surfaces in the form of conical jacket axial sections in particular conical annular surfaces, and partial surfaces thereof can be used.
  • such pressing surfaces that are somewhat inclined to the axis of the can body are used. pressed in the direction of the can axis on the open can end, which narrows the can diameter a little at the open end.
  • co-operating inner and outer pressing surfaces are also used, so that the can jacket can be clamped in the area of the open end between these pressing surfaces
  • the can jacket in the area of the open end when the sealing head is separated from the can body is widened somewhat.
  • a push-off device is preferably provided on the sealing head for pushing off the can body
  • the can body 5 enters a deformation device 20 for deforming the can body shell in the region of the open end face of the cylindrical can body 5 to form a can neck 6b.
  • FIG. 3a The deformation device 20 preferably does at least one spin flow necking Correcting a deformation into a standard opening, in particular for a valve receptacle, can be carried out Deformation device 20 designed as a processing station with a turntable and an axis of rotation 20a.
  • the at least one spin flow necking device is preferably arranged on the deformation device 20 in such a way that it is assigned to a can body 5 and rotates with the turntable and carries out the deformation during part of the rotary movement , the at least one spm flow
  • the can locations of the turntable 23 are preferably designed, as in the case of the decorative film applicator 18, as rotatable, or possibly fixed, can holders 24.
  • the transfer between the two processing stations 18 and 20 with turntables 23 takes place via a transfer turntable 21 it goes without saying that the deformation device 20 also has at least one further deformation device 20 ′, for example a
  • Bordelvomchtung 25 for bordering the free end face of the narrowed neck part in the form of a Randumroll Vor ⁇ chtung according to Fig 3b, may include the can locations of a second turntable 23 of the processing station for deforming the open can end
  • FIG. 2a, 2b and 2c show examples of differently shaped stackable cups 3 used.
  • the diameters and heights of these cups are determined in accordance with the can diameter to be achieved by stretching and the can height to be achieved.
  • the desired wall thickness of the can must also be achievable when choosing one
  • the shape of the cup must also be guaranteed to be easy to stack and unstack. Because the stretchability of stackable cups with a circular cross section is not guaranteed with reasonable effort, indentations (not shown) are provided in cups according to the invention. These indentations are designed in such a way that that the cross-section of the cup decreases from the open end face to the closed end face, the circumferential portion of the indentations increasing from the open end face towards the closed end face.
  • FIG. 2a shows a simple form in which the lateral surface between the inlets Bores is formed as a circular cone section with a straight generatrix, the generatrix being an angle of approximately 8 ° to the cup
  • Fig. 2c shows a cup according to Fig. 2a, but at the open end of the cup there is an essentially radially outward ring area.
  • This ring area can be used as a holding area during stacking and stacking - Gen is shaped as a circular cone section with a curved generator
  • the dimensions, in particular the height, diameter and wall thickness, of the cups used depend on the size of the cans to be ironed from them.
  • can diameters of 35, 45, 50 and 53mm are common.
  • the common heights of the cans with a diameter of 35mm are 88 and 135mm With a diameter of 45, can heights of 105, 150 and 190 are common With diameters of 50 and 53, heights of 106 and 190 or 110 and 205 are common
  • a flat material coated on both sides with a thickness of 0 35mm one can be used for aerosol cans thickness of the floor of essentially 0 3 mm required for safety reasons
  • the can wall of an aerosol can should have a thickness of essentially 0.17 mm.
  • the disks or the punching tools are used for punching out disks selected according to the can diameter and the can height.
  • FIG. 3a and 3b show the deformations required for aerosol cans in the area of the open can jacket, which can be achieved by means of spinning flow necking (Fig. 3a) and rolled edge forming (Fig 3b)
  • the bottom 6a bulged against the inside of the can is preferably formed when stretching out to form the cylindrical can body.
  • the deep-drawing plunger and the press mold associated with its end face must be adapted to the desired bottom shape
  • FIG. 6a, 6b, 6c and 6d show the four-stage ironing process according to a solution from the prior art.
  • a cylindrical cup 3a is pressed from a disc in a first processing step - referred to in technical terms as drawing - for the manufacture of the can body, then more - than referred to as redrawing - ironing steps are carried out
  • the cups 3b and 3c form intermediate stages in the manufacture of the can body 6.
  • the plungers used one after the other in the ironing steps have decreasing diameters from step to step.
  • the cup diameters d1, d2, d3 also take accordingly the can diameter d4 decreases.
  • the wall thickness essentially only decreases with the second and third redrawing.
  • the cup 3b is formed into a stackable cup, if necessary, instead of the cylindrical cup 3b, a stackable cup is formed directly from the State of the art are conical cups 3k according to FIG. 7 with circular cross-sections, the inclination of the lateral surface or the respective tangential surface relative to the axis being 7 ° to 8 ° and thus being above the self-locking angle cylindrical cups can be carried out without problems If cylindrical cups are now in conical cups with circular cross sections In areas where the circumference is reduced, there is a risk of wrinkles forming in an uncontrolled manner in areas where the circumference is increased, there is a risk of cracking because the wall material is not uniform over the entire circumferential length The reduction in wall thickness associated with the expansion will occur at individual points and be so strong there that weak points or cracks form Wrinkles and / or weak points lead to problems during further processing in the second system.
  • Can bodies cannot be produced, where the can wall has a constant wall thickness essentially everywhere. Even with a small conicity and without formation of wrinkles or weak spots, the wall thickness would decrease from the cup bottom to the open end, which leads to problems when stretching in the second system and the provision of Can cores with a constant Wa along the can axis nd strong impossible
  • a conical cup 3k 'according to FIG. 8 with a small conicity and stacking cams 32 could be provided. Due to the small conicity, the circumferential changes are kept small and the unstacking is ensured by the stacking cams acting as spacer elements but connected with the disadvantage of a high empty volume when stacked
  • w represents the wall thickness of the cups 3k
  • sp Gap width between two cups 3 represents the sum of w and sp
  • the stack height is calculated as follows The maximum stack height corresponds to the cup height and occurs when the cups cannot be inserted into each other.
  • the conicity had to be particularly large or the angle between the cup axis and the cup The wall had to be as large as possible, but - as can be seen from the above compilation - the decrease in the stack height decreases with increasing angle
  • a stacking edge 33 is preferably provided, which provides a spacing step with the stacking height C as an external dimension in the axial direction
  • FIG. 9 shows a cup 3 according to the invention with indentations 34 or with folds against the axis, which are designed such that the cup cross section decreases from the first end side towards the second end side, the peripheral portion of the indentations from the first end side against the increases second end face
  • the indentations 34 allow a stackable shape, which can be achieved starting from a cylindrical cup essentially without circumferential changes or expansions or compressions in the jacket wall so that the transition area from the jacket wall to the floor can be easily converted into the stackable shape according to the invention , it is expedient to design this transition area with a sufficiently large radius of curvature already when the cylindrical cup is formed
  • the indentations 34 are preferably formed by pushing a cylindrical cup into a female shape with inwardly projecting ribs.
  • the ribs push the inward wall there where the indentations 34 are to be formed.
  • the ribs first act on the outer wall at the bottom of the Cups Starting from these first contact points, the indentations are shaped ever further towards the open end of the cup and more and more strongly towards the cup axis.
  • the indentations also have radially movable press ribs or Pairs of rollers can be formed with teeth that interlock on both sides of the cup wall. When the indentations are formed, no material displacements or reshaping in the entire ring areas of the cup wall are necessary.
  • the indentations 34 are formed with radii of curvature that are as large as possible, so that no irreversible material deformations occur even in these regions of curvature essentially completely undone. Because the total area of the flat material remained unchanged when the indentations were formed, the original cylindrical shape of the Cups The forces which occur when the indentations 34 are formed and removed between the tool and the cup are small and therefore do not lead to damage to the sheet, even in the case of sheet metal coated with plastic
  • the shaping of the cylindrical cup 3b into a cup 3 with indentations 34 and a curved base is illustrated with the aid of FIGS. 1 and 12.
  • the base curvature 35 is preferably directed towards the inside of the cup.
  • the indentations 34 and the base curvature 35 maintain the shape Cup 3 a shape that is similar to a cupcake shape
  • at least one female and in particular a corresponding male press part is preferably used two steps with at least two female pressed parts
  • the last used press part has essentially the desired cup shape.
  • a press part if used previously, is used to gently initiate the desired deformations.
  • the cup and the pressed parts are preferably moved against each other in the axial direction dashed lines 36 show that the circumferential length can be kept essentially constant by the indentations 34 even with a decreasing cross-section of the cup. It should be noted that this keeping constant only applies to the outer wall of the original cylindrical cup 3
  • the curvature area between the jacket wall and the base, already provided for the conical cup, is intended to narrow the cross section at the base
  • the indentations 34 extend into the woven base area, are distributed substantially uniformly over the circumference and ensure, in particular in the entire cup material, the largest possible radii of curvature. In addition, it can be ensured that the steepest wall area has an angle to the axis of the cup 3 of over 8 ° has
  • the shaping device 37 comprises at least one jerking device with a jerking element 38 for jerking the cup 3 into a cylindrical cup.
  • the jerking device shown comprises approximately a tubular tappet and a receptacle 39 for receiving the cup 3, as well as an annular holding element 40 for holding an end ring 41 of the cup 3.
  • the movement of the jerking element 38 together with an ironing plunger 42 into the interior of the cup 3, according to FIG. 14, in a first cylindrical Hollow region 39a of the receptacle 39 is formed into a cylindrical cup 3b.
  • the ironing device is formed by the receptacle 39, the jerking element 38 and the ironing plunger 42.
  • the end ring 41 is released by lifting the holding element 40
  • the element 38 now serves as a hold-down element and interacts with a corresponding ring surface 43 of the receptacle 39.
  • the transition edge 44 from the ring surface 43 to the second cylindrical hollow region 39b of the receptacle 39 acts as an ironing edge during the ironing movement of the cup performed by the ironing plunger 42 the indicated ironing process, a cylindrical cup with a smaller cross-section and a larger height is produced. According to the prior art, this cylindrical cup can be ironed into a can body
  • a hold-down element 45 adapted to the indentations 34 must ensure that the indentations 34 move around forming regions 45a with material forming without wrinkling into the radial holding-down region between the Hold-down element 45 and receptacle 39 also have to be folded regions 45b of hold-down element 45 must guide the conically moving jacket wall of cup 3 in such a way that indentations 34 in the drawn jacket area strengthened training and thus an uncontrolled formation of wrinkles is avoided.
  • the reshaping areas 45a are not circular, but have projections that are adapted to the indentations, rotationally symmetrical reshaping in the transition to the radially extending hold-down area is less easy to ensure than when using annular reshaping areas. Therefore, the previous spreading of the cup 3 and the shaping on annular first shaping regions 38a shown in FIG. 14 are associated with fewer problems.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)

Abstract

Un contenant, notamment une bombe à aérosol, est produit dans deux procédés partiels consécutifs à partir d'un matériau plat pourvu d'au moins une couche métallique enduite de préférence au moins d'un côté de plastique, notamment de PET. Dans un premier procédé partiel, des godets empilables par insertion (3) sont produits en tant que produits intermédiaires à l'aide d'une première installation (1) ; ils sont stockés empilés pour gagner de la place et acheminés vers une deuxième installation (2). La surface d'enveloppe des godets empilables par insertion présente des rainures orientées dans l'axe, réalisées de telle façon que la section transversale des godets diminue en allant du premier côté frontal vers le deuxième côté frontal, la proportion circonférentielle des rainures augmentant en allant du premier côté frontal vers le deuxième côté frontal. Le deuxième procédé partiel est exécuté dans la deuxième installation : les godets (3) sont désempilés et amenés à un dispositif de façonnage (15) où ils sont façonnés en corps de contenant cylindriques (6). Après l'étirage, les corps de contenant cylindriques (6) sont de préférence coupés à une longueur désirée et, s'il s'agit de bombes à aérosol, façonnés au niveau de l'extrémité de contenant ouverte pour la réception d'une valve.
PCT/CH2001/000036 2000-01-18 2001-01-17 Godet, procede pour la mise a disposition d'un godet et procede pour l'etirage d'un godet en un contenant, ainsi qu'installations pour l'execution de ces procedes Ceased WO2001053160A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP00100865 2000-01-18
EP00100865.5 2000-01-18

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WO2001053160A2 true WO2001053160A2 (fr) 2001-07-26
WO2001053160A3 WO2001053160A3 (fr) 2002-03-14

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PCT/CH2001/000036 Ceased WO2001053160A2 (fr) 2000-01-18 2001-01-17 Godet, procede pour la mise a disposition d'un godet et procede pour l'etirage d'un godet en un contenant, ainsi qu'installations pour l'execution de ces procedes

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1914027A4 (fr) * 2005-08-12 2014-01-01 Jfe Steel Corp Boîte en deux parties, procédé de fabrication idoine et feuille d acier pour boîte en deux parties

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3811393A (en) * 1973-01-12 1974-05-21 Stolle Corp Manufacture of cans and the like
US3910414A (en) * 1973-10-29 1975-10-07 Bruce E Mccay Container structure
US4909393A (en) * 1988-11-14 1990-03-20 Berwick Container Corp. Container reconfiguring system
US5626228A (en) * 1996-05-01 1997-05-06 Anheuser-Busch Incorporated Thin-walled can having plurality of supporting feet with two support features

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1914027A4 (fr) * 2005-08-12 2014-01-01 Jfe Steel Corp Boîte en deux parties, procédé de fabrication idoine et feuille d acier pour boîte en deux parties
EP2799160A1 (fr) * 2005-08-12 2014-11-05 JFE Steel Corporation Boîte en deux parties, son procédé de fabrication et feuille d'acier à cet effet

Also Published As

Publication number Publication date
WO2001053160A3 (fr) 2002-03-14

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