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
  • B65B7/00—Closing containers or receptacles after filling
  • B65B7/16—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons
  • B65B7/28—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by applying separate preformed closures, e.g. lids, covers
  • B65B7/2842—Securing closures on containers
  • B65B7/2878—Securing closures on containers by heat-sealing
• • 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
  • B65D51/00—Closures not otherwise provided for
  • B65D51/18—Arrangements of closures with protective outer cap-like covers or of two or more co-operating closures
  • B65D51/20—Caps, lids, or covers co-operating with an inner closure arranged to be opened by piercing, cutting, or tearing
• • 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
  • B65D2251/00—Details relating to container closures
  • B65D2251/0003—Two or more closures
  • B65D2251/0006—Upper closure
  • B65D2251/0018—Upper closure of the 43-type
• • 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
  • B65D2251/00—Details relating to container closures
  • B65D2251/0003—Two or more closures
  • B65D2251/0068—Lower closure
  • B65D2251/0093—Membrane
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D2577/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks, bags
  • B65D2577/10—Container closures formed after filling
  • B65D2577/20—Container closures formed after filling by applying separate lids or covers
  • B65D2577/2041—Pull tabs
  • B65D2577/2058—Pull tabs attached to the closure

Definitions

• the invention relates to a can according to the preamble of claim 1, to a method according to the preamble of claim 4 and to one
• metal tin cans have essentially been closed either by jointly crimping the cut edge of the can with a metal lid (e.g. according to WO 83/02577 or US-A-3,952,677), or with a foil-provided one
• Sheet metal ring provided (according to AT-A-368.91 9), or the inside of the can wall (1) - at least in the area of the raised foil edge area (5) - had to be conical (e.g. according to DE-U-94 1 4 440), which is a complicated can production and high tolerances required, so that the same position of the membrane plate with respect to the can edge could always be achieved when retracting the stamp.
• the cut edge of the can not known plates with raised edge for cans made of plastic are known (eg DE-A1 - 33 05 144 or CH-A-629 984), but it was always relatively stable lid parts for the bottom of pressure-resistant cans or those made of a relatively soft wall (for example according to US Pat. No. 4,599,123) which required an external pressure recording device for the sealing process.
• the invention has now set itself the task of creating a tin can, in particular one made of tinplate or aluminum sheet, with a simple and, above all, inexpensive closure. This is achieved for the first time by the feature mentioned in the characterizing part of claim 1.
• the closure is made - as has become known in another context - from only one membrane film, optionally from (and in particular laminated with thin aluminum foil) paper and / or plastic, but preferably from a metal foil, in particular from aluminum, all for the sake of simplicity only as Designates the film and, if necessary, allows the can opening to be exposed in a manner known per se with the aid of tear-open tabs.
• the edge of the membrane plate which is pulled up in the direction of the can axis does not overlap the - preferably flanged - edge of the can, thus facilitating tearing open and therefore leaving the can edge with its robust outside or standing surface.
• the membrane film is preferably at most 0.2 mm, in particular at most 0.1 mm, consists, for example, of a 50 ⁇ aluminum foil with 20 ⁇ heat seal coating on the inside and 10-20 ⁇ lubricating lacquer coating on the outside and is therefore suitable for closing the subsequent removal opening.
• the can base can also be designed according to the invention if required.
• embossed foils is further preferred because these are easier to nestle on cans with changing tolerance and also result in better stability.
• the membrane film - at least in the area intended for connection to the inner wall of the can - is coated with a heat seal lacquer.
• the inner wall of the can in the area mentioned - like that of (e.g. coated with aluminum foil) combination cans - with a primer or a heat sealable
• the method for producing the can according to the invention uses the characterizing feature of claim 3. Preferred developments of the method according to the invention are described in the characteristics of claims 4 and 5.
• the membrane foils used to close the cans according to the invention are expediently prefabricated from material according to claim 9, in order then to be applied to the corresponding can opening using the method according to the invention. They then preferably have the feature of claim 10, so that they can easily be introduced even in cans with different tolerances and in some cases already lie in the desired position through the conical film edge area 5. This security function can be further improved by the feature of claim 11.
• US-A-4,599. 1 23 has proven to be extraordinarily unfavorable, since when it is drawn into the can - without overlapping the cut edge of the can edge - it has to lead to folds which make it difficult for the film to be tightly connected to the inner wall of the can or even make it impossible.
• the film used according to the invention is relatively thin and preferably a film with good thermal conductivity, use will be made of a hot joining process, for example one
• Fig. 1 the sequence of the method according to the invention, for which the
• FIG. 2-3 illustrate enlarged details II and III from Fig. 1 a and 1 b, while Fig. 4 shows a section through the inventive device.
• Fig. 5a and b show a horizontal partial section through the inventive
• a can 1 made of sheet metal is to be closed with a membrane film 2.
• the film 2 can be connected to a tear-open tab 3 in any way, for example by gluing.
• the tab 3 can be used as a whole to tear off the membrane film 2 which has been introduced into the can 1 and connected to it at the edge. This is cheaper because either a predetermined breaking point, for. B. by punching, or a separation of the membrane cutting edge overlapping the can cutting edge from the membrane opening plate spanning the can opening had to be created.
• a thin film which is only used to keep fresh or to preserve the aroma or to prevent contamination, is relatively difficult to handle.
• the membrane film 2 closing the can bottom preferably has at least one annular bead for the purpose of stiffening (and also for the purpose of achieving a slight radial elasticity during deep drawing and / or sealing).
• the film 2 reinforced in this way can now be form-fitting (so that the film shape is not changed when inserted into the can opening), e.g.
• the raised edge is at least slightly conically divergent, i.e. it results in a vertical V, even if only a very small but measurable angle ⁇ , which will have a size of less than 5 °, in particular less than 2 °.
• the Diameter on the underside of the membrane plate, ie in the area of the cover surface 4 should be only a few tenths of a mm smaller than the opening diameter of the membrane plate, the height measured along the vertical V only having to be about 5 mm.
• the upper, larger diameter of the film 2 is, of course, expediently chosen such that it is held frictionally on the top of the can 1 when it is placed on by the suction gripper.
• a further measure for securing the film 2 on the upper side of the can 1 can consist in a collar 6 which is hook-shaped in cross section and which interacts with the upper edge of the can 1.
• the upper, mostly sharp-edged edge of the can 1 is, by the way, preferably flanged outwards (7 in FIG. 1a, 3) in order to prevent damage to the thin film or injury to the user.
• the method according to the invention and the device according to the invention bring about the tight connection of the membrane film 2 with the cylindrical region of the inner wall of the can directly below the (preferably flanged) edge of the can:
• the stamp 8 is in accordance with FIG.
• Fig. 4 section shown. It consists of several parts, namely the actual stamp surface 9, which protrudes upwards over pins 10 (only one is shown, preferably there are three) connected to the attachment 1 1 of a stamping head 1 2.
• a centering ring 1 3 is placed around the stamp surface 9 and can be displaced along guide pins 14 and against the action of at least one compression spring 15. Normally, the ring 1 3 assumes the lowered position on the left in FIG. 4, in which it is supported, for example in a manner not shown, on the upper side of the stamp surface 9, but may also be held by other means.
• the centering ring 1 3 receives the edge of the can and has a small recess 1 6 'for this purpose.
• the process can now proceed in such a way that the can 1 stands on a lifting table and is lifted up, as a result of which the centering ring 1 3 moves against the action of the spring 1 5 into the upper position shown on the right.
• the stamp surface 9 emerges from the inside of the ring 1 3 and thus presses the film plate 2 into the position shown in FIGS. 1 b and 3.
• the ring 1 3 could also be stationary and hold the can centered while the stamp surface 9 is moved downwards.
• approach 11 would be designed as a piston rod of a fluidic unit, preferably a pneumatic piston-cylinder unit.
• the centering of the can or, relative to it, of the film 2 could also take place in a wide variety of ways.
• the punch 8 has a spreading device, which in the exemplary embodiment according to FIG. 4 is formed by a wedge arrangement.
• a series of wedge segments 16 is guided along the top of the stamp surface 9 in such a way that they can be displaced radially outward with respect to the central axis A of the stamp 8.
• the rear side of the stamp surface 9 could have grooves or slots (not shown), for example. However, it also likes the flat back of the stamp surface
• wedge segments 1 6 themselves could be used to press the raised foil edge area 5 of the foil 2 against the inner circumference of the can 1, it is advantageous if they are spanned by elastic piston rings 17 or snap rings. This creates a more uniform circumferential surface when these rings 17 are pressed against the film edge region 5 of the film 2 and moreover also results in a double function in a double function, which acts on the segments 16.
• a conical wedge 1 8 In order to press the wedge segments 1 6 radially outwards, a conical wedge 1 8 is provided, which can be moved downwards by means of an actuating rod 1 9 by a drive, preferably of a pneumatic type, and between the wedge segments with their wedge surfaces 20.
• a drive preferably of a pneumatic type
• the reason for preferring a pneumatic drive is that there is hardly any risk of contamination from oil or leakage liquid, and it is particularly easy to set a maximum pressure that does not widen the can. If the conical wedge 1 8 is now moved downwards against the stamp surface 9, it spreads the wedge segments 1 6 apart and thus presses the elastic rings 1 7 against the foil edge region 5 (which is indicated in fragments at the bottom right in FIG. 4), where the edge of the can is stuck in the recess 1 6 '. In this way, the position of the film 2 according to Fig. 1 b reached.
• the film 2 must now also be secured and generally also sealed. This can be done in a conventional manner by means of adhesive, preferably by means of heat sealing, because the thin film 2 allows the heat to pass through relatively well.
• adhesive preferably by means of heat sealing
• a heating device is then assigned to the spreading device 1 6-1 8. This could in itself be formed by heating windings accommodated in the wedge segments 1 6, but the space at this point is very narrow, and movable connections must also be provided. Although this possibility should not be excluded, a (e.g. annular) radiant heating source 22, e.g. B. above the wedge segments 1 6 and the rings 1 7 are provided, which heats these parts in order to heat the hot glue 21 (FIG. 2) and to fuse with the inner wall of the can 1.
• the wedge segments 16 can be formed, for example, from a ceramic material with good heat storage properties, which also improves the wear properties.
• FIG. 5a shows the wedge segments 1 6 and a snap ring 1 7 in the closed
• Fig. 5b shows the wedge pieces 1 8 of the stamp 8, not shown here, moved perpendicular to the plane of the drawing) in a spread position for the purpose of heat sealing the film 2 to the inner wall of the can.
• the conical wedge 1 8 could simply be formed by a pressure plate movable relative to the stamp surface 9, a rubber bellows may be provided between the top of the stamp surface 9 and this pressure plate. This expands when a pressure medium is applied through the pressure plate used in place of the part 18, which would then also be connected to the rod 19 for its actuation, from the top to the side and thus presses on the displaceable parts 1 6 or directly the rings 1 7.
• a horizontally running drive, radially outwards, would be conceivable for the individual segments 16, but would be structurally complex. Especially in this case, but also in other cases, heating the upper edge of the can from the outside for heat sealing may be the simpler solution.
• a cover 23 or 24 (FIG. 1 c) can also be applied.
• a particular advantage of the present invention is also that the foils can be manufactured separately and, if necessary, kept in stock, whereby - with the same diameter of the cans 1 - cans with different volumes with the prefabricated and due to their design with the foil edge area 5 are sufficient stable foils 2 can be loaded.
• This film edge area 5 can also be easily coated with the adhesive 21, which would be difficult to attach to the inner circumference of the can due to the risk of contamination.
• the invention is of course not limited to the use of an adhesive, as has already been explained. The invention is not restricted to the illustrated embodiments.
• the output of the device according to the invention with - z. B. arranged on a turntable - multiple tools can be increased in a conventional manner.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Closures For Containers (AREA)
• Rigid Containers With Two Or More Constituent Elements (AREA)
• Laminated Bodies (AREA)
• Making Paper Articles (AREA)
• Closing Of Containers (AREA)
• Wrappers (AREA)
• Electroplating Methods And Accessories (AREA)
• Separation Using Semi-Permeable Membranes (AREA)
• Lining Or Joining Of Plastics Or The Like (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=8219151

Family Applications (1)

Country Status (15)

Cited By (1)

Families Citing this family (15)

Family Cites Families (5)

• 1996
  • 1996-03-30 EP EP96910945A patent/EP0819086B1/fr not_active Expired - Lifetime
  • 1996-03-30 ES ES96910945T patent/ES2127634T3/es not_active Expired - Lifetime
  • 1996-03-30 KR KR1020057005324A patent/KR20050038655A/ko not_active Ceased
  • 1996-03-30 DE DE59601055T patent/DE59601055D1/de not_active Expired - Fee Related
  • 1996-03-30 AU AU53987/96A patent/AU694023B2/en not_active Ceased
  • 1996-03-30 CA CA002217311A patent/CA2217311C/fr not_active Expired - Fee Related
  • 1996-03-30 NZ NZ305862A patent/NZ305862A/en not_active IP Right Cessation
  • 1996-03-30 BR BR9604869-7A patent/BR9604869A/pt not_active IP Right Cessation
  • 1996-03-30 AT AT96910945T patent/ATE174859T1/de not_active IP Right Cessation
  • 1996-03-30 DK DK96910945T patent/DK0819086T3/da active
  • 1996-03-30 JP JP52996796A patent/JP3689115B2/ja not_active Expired - Fee Related
  • 1996-03-30 WO PCT/EP1996/001410 patent/WO1996031406A1/fr not_active Ceased
  • 1996-03-30 KR KR1019970706908A patent/KR100526838B1/ko not_active Expired - Fee Related
  • 1996-03-30 CN CN96194081A patent/CN1063401C/zh not_active Expired - Fee Related
  • 1996-04-02 ZA ZA962628A patent/ZA962628B/xx unknown
• 1999
  • 1999-02-19 GR GR990400542T patent/GR3029457T3/el unknown

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events