EP3554734B1 - Verfahren und vorrichtung zur herstellung von aufreissdeckeln sowie ein aufreissdeckel - Google Patents
Verfahren und vorrichtung zur herstellung von aufreissdeckeln sowie ein aufreissdeckel Download PDFInfo
- Publication number
- EP3554734B1 EP3554734B1 EP18703189.3A EP18703189A EP3554734B1 EP 3554734 B1 EP3554734 B1 EP 3554734B1 EP 18703189 A EP18703189 A EP 18703189A EP 3554734 B1 EP3554734 B1 EP 3554734B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sealing
- rolled
- lid
- strip
- peel
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims description 21
- 238000007789 sealing Methods 0.000 claims description 95
- 238000012545 processing Methods 0.000 claims description 68
- 238000010438 heat treatment Methods 0.000 claims description 64
- 239000004033 plastic Substances 0.000 claims description 64
- 229920003023 plastic Polymers 0.000 claims description 64
- 239000000463 material Substances 0.000 claims description 45
- 238000004519 manufacturing process Methods 0.000 claims description 21
- 239000011888 foil Substances 0.000 claims description 16
- 238000002844 melting Methods 0.000 claims description 16
- 230000008018 melting Effects 0.000 claims description 16
- 238000000576 coating method Methods 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000005096 rolling process Methods 0.000 claims description 6
- 230000006698 induction Effects 0.000 claims description 5
- 229920000642 polymer Polymers 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 5
- 239000004743 Polypropylene Substances 0.000 claims description 3
- -1 polypropylene Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 239000004088 foaming agent Substances 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims 3
- 239000002966 varnish Substances 0.000 claims 2
- 238000009434 installation Methods 0.000 claims 1
- 238000001816 cooling Methods 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 230000001939 inductive effect Effects 0.000 description 5
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- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000001954 sterilising effect Effects 0.000 description 4
- 238000004659 sterilization and disinfection Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000004922 lacquer Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
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- 239000004593 Epoxy Substances 0.000 description 1
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- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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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
- 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
- B21D51/443—Making closures, e.g. caps easily removable closures, e.g. by means of tear strips
-
- 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
- B21D51/383—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures scoring lines, tear strips or pulling tabs
-
- 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
-
- 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
- B21D51/46—Placing sealings or sealing material
-
- 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
- B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
- B65B51/10—Applying or generating heat or pressure or combinations thereof
-
- 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
- B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
- B65D17/50—Non-integral frangible members applied to, or inserted in, preformed openings, e.g. tearable strips or plastic plugs
- B65D17/501—Flexible tape or foil-like material
- B65D17/502—Flexible tape or foil-like material applied to the external part of the container wall only
-
- 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
- B65B7/285—Securing closures on containers by deformation of the closure
-
- 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
- B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
- B65D2517/0001—Details
- B65D2517/001—Action for opening container
- B65D2517/0013—Action for opening container pull-out tear panel, e.g. by means of a tear-tab
-
- 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
- B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
- B65D2517/50—Non-integral frangible members applied to, or inserted in, a preformed opening
- B65D2517/5002—Details of flexible tape or foil-like material
- B65D2517/5008—Details of flexible tape or foil-like material with a sealing coat
-
- 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
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S72/00—Metal deforming
- Y10S72/715—Method of making can bodies
-
- 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
Definitions
- the invention relates to a method for producing tear-open lids according to the preamble of claim 1. Furthermore, the invention relates to a device for producing tear-open lids according to the preamble of claim 9 and a tear-open lid according to claim 15.
- Tear-off lids are known, for example from DE-U 298 17 592 or off DE-U 92 03 953 . If the container, which is closed with the tear-off lid, contains a liquid, corrosive product, such as salt water, the bare cut edge of the lid opening can corrode. In the case of a tear-off lid with a so-called retort-curl, the rolling of the area with the cut edge upwards and outwards and the overlap with the tear-off foil provide a certain protection against the influence of the product. The bare or possibly corroded cut edge is also not visible. However, depending on the aggressiveness of the product and the storage time of the filled container, traces of corrosion can still be visible.
- the invention is based on the object of creating an improved method with which tear-off lids can be produced industrially at a very high rate and at low cost, and in which the number of faulty lids with inadequate cut edge protection practically approaches zero.
- the rolled-up area includes at least the actual retort curl, which adjoins the area of the cover ring that forms the sealing surface and in particular includes the entire area in which the strip of plastic material is present.
- heating it is meant that the rolled-up area is brought to a temperature that enables the plastic material to melt, it being not mandatory, but preferred, that the entire rolled-up area is homogeneously brought to the same temperature.
- the melting of the plastic material does not mean that the entire plastic material of the strip has to be brought to the melting temperature. It can be sufficient if the material layer of the plastic material adjoining the cover material melts in order to ensure the adhesion of the plastic material to the cover ring material.
- the heating is also not restricted to the rolled-up area, it may be that the entire cover ring is heated, but heating is preferred that is essentially restricted or concentrated to the rolled-up area with the strip of plastic material. Any heat sources can be used for this.
- the rolled-up area is preferably heated before the tear-off film is sealed onto the cover ring, so that this is a separate work step in the production of the cover.
- the heating and melting of the plastic material can be carried out separately from the introduction of heat during the sealing of the tear-open film and the influence of the heating of the rolled-up area on the seal can also be avoided.
- Cooling of the cover ring can also be provided between the heating of the rolled-up area and the sealing, for example by means of an air stream, so as not to influence the seal or the sealing parameters for the sealing of the tear-off film on the cover ring.
- An inductive heating means is preferably used to heat the rolled-up area. This creates eddy currents in the metallic cover material, which cause it to be heated.
- the heating can affect the entire lid ring. Provision can be made for the arrangement of the inductive heating means and, if necessary, a concentration of the field lines of the inductive heating by means of pole pieces to generate the eddy currents mainly in the rolled-up area.
- the inductive heating of the metal material of the cover ring can cause the plastic material to be heated very quickly to the temperature at which the plastic material is melted.
- Inductive heating means have long been used in the industrial environment for heating workpieces and are known to those skilled in the art and are also commercially available. Alternatively, the heating can also take place with infrared radiation or hot air.
- a heating means contacting the rolled-up area is preferably provided in the sealing tool so that a direct heat transfer takes place from the heating means to the rolled-up area.
- the heating of the rolled-up area can be carried out separately from the sealing of the tear-off film on the cover ring, so that the sealing is not influenced in a disruptive manner by the heating of the rolled-up area. It is possible to carry out the heating in two stages both outside the sealing tool, in particular inductively, and also inside the sealing tool.
- plastic material of the strip in the present case includes that the strip comprises or consists of a polymer or a resin, and that the heating of the rolled-up area takes place at least to the melting temperature of the plastic material of the strip.
- the rolled-up area is heated to a temperature in the range from 100 ° Celsius to 200 ° Celsius and in particular to a temperature in the range from 140 ° to 180 ° Celsius.
- the top of the lid blank forming the heat-sealable sealing surface for the tear-off film is or comprises a polypropylene-modified lacquer system, or is a polypropylene laminated coating, or is another coating containing polypropylene, and that the underside of the lid blank has a coating of a can interior lacquer with polyester or acrylic or epoxy or polyvinyl chloride.
- the named choice of material for the strip made of plastic and the named areas for the heating result in a particularly good connection between the named coatings of the cover blank or cover ring and the plastic strip.
- a foaming agent can be added to the plastic material of the strip so that when the rolled-up area is heated, foaming occurs which can enlarge the area or the surface of the adhesion.
- the invention is also based on the object of creating a manufacturing device for tear-open lids, by means of which tear-open lids can be manufactured at high speed and inexpensively, which have practically fault-free protection of the cut edge of the tear-open lid against corrosion.
- the device is used to heat the rolled-up area and melt the Plastic material of the strip ensures optimal adhesion of the plastic material to both sides of the cover ring can be achieved, both of which adjoin the plastic material of the strip in the rolled-up area.
- the device achieves a hermetic seal between the rolled-up area and the contents of the container to which the tear-open lid is applied. In this way, the corrosion of the cut edge in the case of tear-off lids which have been produced on a device according to the invention can be reliably avoided.
- the rolled-up area is usually a retort curl that adjoins the area of the cover ring that forms the sealing surface.
- the heating that can be achieved with the processing station means that the rolled-up area is brought to a temperature that allows the plastic material to melt, although it is not mandatory, but preferred, that the entire rolled-up area is homogeneous on the same Temperature is brought.
- the melting of the plastic material does not mean that the entire plastic material of the strip has to be brought to the melting temperature. It can be sufficient if the material layer of the plastic material adjoining the cover material melts in order to ensure the adhesion of the plastic material to the cover ring material.
- the heating is also not limited to the rolled-up area; it may be that the entire cover ring is heated, but heating is preferred that is essentially concentrated on the rolled-up area. Any heat sources can be used for this.
- An induction heating means is preferably provided as a heat source in the further processing station. This allows a particularly rapid heating of the cover ring, and in particular of its rolled-up area, to the desired temperature, which is required for melting the strip made of plastic. This means that the high production rate for tear-off lids can also be maintained with the additional processing station.
- the further processing station can be provided at any point along the conveying path of the device between the processing station which produces the rolled-up area and the sealing station. It can be arranged before or after a turning station of the device. The arrangement in front of the turning station is advantageous because it allows the cover rings to cool down again up to the sealing station.
- An additional cooling station which cools the cover rings with an air stream, for example, can serve for cooling.
- the cooling before the sealing station has the advantage that the sealing parameters are not influenced by the previous heating of the cover ring.
- the further processing station is integrated in the at least one sealing station and has a heating means that contacts the rolled-up area in the sealing tool.
- the further processing station is preferably integrated in the second sealing station.
- the further processing station is designed in particular for heating the rolled-up area in the temperature range from 100 ° Celsius to 200 ° Celsius and in particular in the range from 140 ° to 180 ° Celsius. It is also preferred that the application station for applying the band-shaped plastic strip is designed in such a way that a strip with a substantially uniform thickness, in particular a thickness in the range from 0.05 mm to 0.5 mm and in particular with a thickness of approx , 1 mm, can be generated. The small thickness of the strip is advantageous for the rapid reaching of the melting temperature.
- the invention further relates to a tear-open cover, comprising a circumferential fastening section, a sealing flange with a sealing flange Tear-off film, and a rolled-up area that runs around the sealing flange and laterally delimits the removal opening, the rolled-up edge having a seal made of a plastic, which term means a polymer or a resin, which is made by melting the plastic in the rolled-up area with the top and the underside of the tear-off lid is adhesively connected.
- a plastic which term means a polymer or a resin, which is made by melting the plastic in the rolled-up area with the top and the underside of the tear-off lid is adhesively connected.
- FIG. 1 shows a cover blank 1.
- a stack 12 which contains a large number of such lid blanks, which are individually stacked and processed along the transport path by different processing stations, whereby lid rings are first formed from the lid blanks and these are then processed further to the finished tear-off lid.
- the cover blanks are, for example, round disks made of coated metal and thus protected against corrosion, for example made of coated tinplate.
- the coating of the in Figure 1 upper underside is usually different from that in Figure 1 underlying coating of the top of the blanks 1.
- the conveying device 22 which conveys the lid blanks, the lid rings and the tear-off lid in the manufacturing device 20 along the transport path in the direction of the arrow A from one processing station to the next processing station, is formed in particular by two toothed belts running in parallel, on which receptacles for the lid blanks or Cover rings are provided, as will be apparent to those skilled in the art WO 2006/017953 known. This is also not explained further here.
- the blank to be processed is lifted off the conveyor 22 and processed by the respective processing station and returned to the conveyor 22. This is indicated with arrows pointing up and down at the processing stations.
- the drive of the machining stations is indicated below the conveyor. This is used to raise and lower the blanks and cover rings and to carry out the respective processing steps.
- a cover ring 2 is first formed from the cover blank 1 by cutting out a central part 30 of the blank and disposing of it as waste. This forms the removal opening of the tear-open cover, which is closed with the tear-off film in a later manufacturing step.
- a sealing flange 7 remains adjacent to the removal opening 15.
- the metal material lies bare at the cut edge 31 or the sheet metal of the cover ring 2 is no longer protected there by the coating or coatings.
- the edge of the removal opening is pulled upwards to form a collar 4 and this collar is rolled in a further processing station 25, so that a so-called retort curl 5 is formed.
- the shape of the curl or the retort curl can be different.
- the curling which forms the edge of the removal opening ensures that the user of the can is protected from the sharp-edged cut edge 31 when removing the contents of the can.
- the turning station 26 follows, which turns the cover rings, so that during further processing the sealing flange 7 is at the top after the turning station in the conveyor device 22 and in the processing stations.
- the tear-off film 8 is then sealed onto the sealing flange, which can be done in two stages with a first sealing station or pre-sealing station 27 and a second sealing station or a main sealing station 28.
- the sealing process is also known to the person skilled in the art and is not explained further here. Further processing stations can follow in which the sealing film is embossed, the tear-off tab is positioned and the seal is tested for leaks. This is also known to the person skilled in the art and is not explained further here.
- finished tear-off covers 10 ( Figure 5 ) output whose removal opening 15 is spanned by a tear-off film 8 which is sealed on the sealing flange 7.
- the edge of the removal opening 15 is by a (in the position of the lid according to Figure 5 ) retort-curl 5 bent upwards and outwards.
- the finished tear-off lid 10 can be attached to a can jacket (shown in FIG Figure 5 is only indicated with a wall part 11) are attached and thus closes the box. This takes place in the bottling plant in which the can has been filled with a product.
- the filled can can be opened later by tearing the tear-off film away from the lid ring by means of its tear-off tab 18, with the result that the removal opening 15 is open.
- Figures 6 and 7 show a cover ring in which the processing step of drawing the edge of the removal opening to form the collar 4 has already taken place. This took place in the processing station 24.
- an inward curvature has been produced at the upper end 34 of the collar 4, which facilitates the subsequent curling to form the retort curl.
- a plastic strip 32 has also been applied to the inside 40 of the collar 4 in one work step. This plastic layer is applied in a separate processing station 29, which is arranged between the drawing station 24 and the rolling station 25.
- the band-shaped strip 32 made of the plastic material forms a seal for the cut edge 31 when it is rolled up, which is shown below.
- the strip 32 consists of a plastic, which term here means a polymer or resin. Such plastics are commercially available and in particular also commercially available in qualities that reliably withstand the sterilization temperature during the sterilization of the filled container and thus do not melt again at the sterilization temperature, so that the seal formed by the strip is retained during the sterilization.
- the strip is preferably of uniform thickness over the entire height of the band. It is provided as a thin plastic strip, which preferably has a thickness d in the range from 0.05 millimeters to 0.2 millimeters, preferably a thickness of approximately 0.1 millimeters.
- the height H of the strip can be, for example, 1 to 3 mm.
- the application is preferably carried out on the basis of the expert WO 2015/164986 A1 known way by spraying molten, liquid plastic material, with a relative movement of the nozzle and cover ring.
- the cover ring is moved in a rotating manner in the processing station 29 and the inside 40 of the collar 4 is moved past the outlet opening of a spray nozzle which is statically arranged during application and from which the plastic emerges.
- the cover ring is thus raised at the processing station 29, set in rotation and the application is activated when the cover ring has reached the correct position in relation to the outlet opening.
- the cover ring After at least one full revolution, when a continuous band or such a strip is formed on the inside, the cover ring is moved back down to the conveyor, whereby the rotation is stopped so that the cover ring is placed back on the receptacles of the conveyor can. Then it is conveyed to the roll-in station 25.
- the plastic of the band 32 cools down as soon as it is applied to the cover ring and solidifies so that the plastic does not flow during further conveyance and the band is stable in the form shown.
- a coolant for example in the form of a fan, can be provided in the application station or processing station 29.
- the strip 32 can also be applied to the cover ring in other ways. So it is possible to have a insert prefabricated strips of plastic material in the collar of the cover ring. This can take place in a separate processing station or when pulling the collar in station 24 or when rolling in the collar in station 25. In these cases the station 29 shown would be omitted.
- the strip 32 is positioned on the inside 40 of the collar 4 that it is closer to the plane of the sealing flange 7 than to the cutting edge 31.
- the positioning and dimensioning of the strip is approximately such that the strip 32 is the lower third of the Collar 4 to about the lower half of the collar 4 covered.
- a greater height H of the strip is possible, but then the cost of material for the plastic used increases without this being necessary for further processing or for protecting the cut edge. In practice, the height H will be approx. 1 mm to 3 mm.
- Lid ring provided with the plastic strip is provided with a retort curl 5 in the processing station 25 in a known manner.
- This station 25 works with the rolling tools known for this, so that this does not have to be explained in detail here, since this is known to the person skilled in the art.
- a modification which is obvious to a person skilled in the art may arise in the case of the tools if the collar 4 has already been pre-bent at its upper edge 34 for curling, which is preferred.
- the Figures 8 and 9 show the cover ring after the turning station 26, that during the formation of the retort curl 5 the strip 32 forms a seal which prevents the entry of liquid into the interior of the retort curl.
- the manufacturing device 20 for the tear-off lid comprises the processing station 29 for applying the tape 32 to the lid ring and the processing station 25 for rolling in the collar 4.
- the rolled edge area is heated in order to melt the strip 32 at least in the contact area with the metal of the lid or the coatings on it.
- the rolled-up edge area includes at least the retort-curl 5, as it is for example in Figure 9 can be seen and in particular the entire part of the tear-open cover covered by the strip 32.
- a processing station 35 is provided in front of the turning station 26, in which processing station 35 the rolled-up area is heated. This can be done in such a way that the cover is also lifted off the conveying means 22 at this processing station 35, followed by heating in the processing station and then placing on the conveying means.
- the cover ring or its rolled-up area can, however, also be heated in the processing station while it is on the conveying means 22, that is to say without being lifted off the conveying means.
- the cover ring In the processing station 35 in front of the turning station, the cover ring is still lying with the retort curl or the rolled-up area pointing upwards, as in FIG Figure 4 shown.
- an induction heating device is preferably provided in the processing station 35, which is shown schematically as block 43.
- an induction heating device is known to the person skilled in the art and need not be explained in more detail here.
- an infrared radiation source or a hot air source could also be provided.
- the processing station for heating the rolled-up area can be provided after the turning station and is shown in the illustrated example with broken lines as processing station 35 '.
- the rolled-up area is at the bottom and accordingly it is preferred if the heating source acts from below, so that it can be more advantageous to design the processing station 35 'in such a way that the cover ring is lifted off the conveyor means 22 in it to allow processing with the heating source.
- induction heating or another type of heating which is only shown schematically as block 43, can be provided.
- cooling can be provided, for example by means of a fan. This is particularly advantageous if the processing station 35 ′ is present after the turning station 26 and a presealing station 27 for presealing the tear-open film 8 on the sealing flange 7 is also provided. Otherwise, the heating of the rolled-up area can have an undesirable effect on the temperature for the pre-sealing.
- FIGS. 12 and 13 show an example of the structure of a sealing tool for sealing the tear-off film and for heating of the curled area.
- Figure 12 shows a detailed representation of the lower part 36 of the sealing tool, on which a cover ring 2 rests, which has been lifted from the conveying means 22 by the sealing tool.
- Figure 13 shows the lower sealing tool in a diagrammatic representation and already after the sealing step with the tear-off film 8 on the lid ring 2.
- a suitable sealing film is then placed on the lid ring and using the upper sealing tool - not shown attached to the sealing flange 7 by the sealing process, after which the tear-off cover is placed on the conveyor means 22.
- the sealing tool has a special heating means 38, which directly contacts the rolled-up area and in particular the retort-curl 5 in order to bring the heat of the heating means 38 into the rolled-up area to heat the same and to melt the strip 32.
- the thermal energy for the heating means 38 is provided by the heating elements 39, which also serve to heat the lower sealing tool below the sealing flange 7.
- These heating elements 39 which are electrically heated, are in direct connection with the sealing tool and are in heat flow connection with the heating means 38 via a heat transfer layer 42.
- This is a preferred example, but it is obvious to a person skilled in the art that it generates heat for the heating means 38 can also be used in other ways for the rolled-up area.
- a tear-open cover 10 with a rolled-up area of the removal opening 15 is thus formed so that before the rolled-up cover is formed Area a plastic strip 32 is applied to the collar of the cover ring. After the rolled-up area has been formed, the plastic strip is melted in order to ensure good adhesion of the plastic to the top and bottom of the tear-open cover in the rolled-up area. This results in a practically hermetic sealing of the cut edge 31 of the tear-open cover in a cost-effective manner and with the possibility of production at high rates.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Closures For Containers (AREA)
- Closing Of Containers (AREA)
- Containers Opened By Tearing Frangible Portions (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH00536/17A CH713744A2 (de) | 2017-04-21 | 2017-04-21 | Verfahren und Vorrichtung zur Herstellung von Aufreissdeckeln sowie ein Aufreissdeckel. |
PCT/CH2018/000004 WO2018191828A1 (de) | 2017-04-21 | 2018-01-25 | Verfahren und vorrichtung zur herstellung von aufreissdeckeln sowie ein aufreissdeckel |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3554734A1 EP3554734A1 (de) | 2019-10-23 |
EP3554734B1 true EP3554734B1 (de) | 2020-09-23 |
Family
ID=61163448
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18703189.3A Active EP3554734B1 (de) | 2017-04-21 | 2018-01-25 | Verfahren und vorrichtung zur herstellung von aufreissdeckeln sowie ein aufreissdeckel |
Country Status (9)
Country | Link |
---|---|
US (1) | US20200094308A1 (zh) |
EP (1) | EP3554734B1 (zh) |
JP (1) | JP2020517526A (zh) |
CN (1) | CN110366457A (zh) |
CH (1) | CH713744A2 (zh) |
ES (1) | ES2832878T3 (zh) |
PT (1) | PT3554734T (zh) |
TW (1) | TWI754004B (zh) |
WO (1) | WO2018191828A1 (zh) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2022531588A (ja) * | 2019-05-09 | 2022-07-07 | コンステリウム ロールド プロダクツ シンゲン ゲーエムベーハー アンド シーオー.カーゲー | 一定の厚さを有するスカートを含む金属製閉栓用ロングキャップの製造方法 |
CH716413A1 (de) | 2019-07-18 | 2021-01-29 | Soudronic Ag | Verfahren und Vorrichtung zur Herstellung von Aufreissdeckeln sowie Aufreissdeckel. |
CH716830A1 (de) * | 2019-11-22 | 2021-05-31 | Soudronic Ag | Verfahren und Vorrichtungen zur Herstellung von Aufreissdeckeln. |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05138660A (ja) * | 1991-11-21 | 1993-06-08 | Anritsu Corp | 樹脂の成形方法 |
DE9203953U1 (de) | 1992-03-24 | 1992-07-23 | Alcan Rorschach Ag, Rorschach | Verschlußdeckel für Dosen o.dgl. Behälter |
CN1054105C (zh) * | 1995-02-27 | 2000-07-05 | 王炜 | 防污染易拉罐的制作方法和加工装置 |
JPH11138228A (ja) * | 1997-11-07 | 1999-05-25 | Sako Seisakusho:Kk | 金属缶の製造装置 |
DE29817592U1 (de) | 1998-10-02 | 1998-11-26 | Union Deutsche Lebensmittelwerke GmbH, 20355 Hamburg | Dose |
DE10022553C1 (de) * | 2000-05-10 | 2001-07-05 | Rasselstein Hoesch Gmbh | Verfahren zum Herstellen eines Ringteils aus Blech für einen Dosendeckel |
CN1315698C (zh) | 2001-03-29 | 2007-05-16 | 纳瓦拉原料工业股份有限公司 | 盒子特别是罐头盒的密封装置 |
JP2003170537A (ja) * | 2001-12-04 | 2003-06-17 | Three M Innovative Properties Co | フランジ部シール材 |
JP4375704B2 (ja) * | 2003-01-27 | 2009-12-02 | 大和製罐株式会社 | 金属缶の開口カール部製造方法 |
US7055713B2 (en) * | 2002-11-12 | 2006-06-06 | Sonoco Development, Inc. | Easy-opening closure for retortable container |
ATE484348T1 (de) | 2004-08-18 | 2010-10-15 | Soudronic Ag | Verfahren und vorrichtung zum fördern von zu bearbeitenden gegenständen |
JP5063959B2 (ja) | 2006-08-21 | 2012-10-31 | 東洋製罐株式会社 | 金属缶用ホットメルト組成物及びこれを用いて成る金属缶 |
JP4987532B2 (ja) * | 2007-03-28 | 2012-07-25 | 藤森工業株式会社 | シールフィルムの製造方法およびインナーシール付き容器の製造方法 |
CN103930222B (zh) * | 2012-11-02 | 2016-04-27 | 广州市泰雅印铁制罐有限公司 | 一种用于密封圆筒内壁缝隙的方法和设备 |
CH709571A1 (de) * | 2014-04-29 | 2015-10-30 | Soudronic Ag | Verfahren und Vorrichtung zur Herstellung von Aufreissdeckeln sowie ein Aufreissdeckel. |
-
2017
- 2017-04-21 CH CH00536/17A patent/CH713744A2/de not_active Application Discontinuation
-
2018
- 2018-01-25 JP JP2019547295A patent/JP2020517526A/ja active Pending
- 2018-01-25 CN CN201880014426.9A patent/CN110366457A/zh active Pending
- 2018-01-25 US US16/605,820 patent/US20200094308A1/en not_active Abandoned
- 2018-01-25 ES ES18703189T patent/ES2832878T3/es active Active
- 2018-01-25 WO PCT/CH2018/000004 patent/WO2018191828A1/de unknown
- 2018-01-25 PT PT187031893T patent/PT3554734T/pt unknown
- 2018-01-25 EP EP18703189.3A patent/EP3554734B1/de active Active
- 2018-02-06 TW TW107104092A patent/TWI754004B/zh not_active IP Right Cessation
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
ES2832878T3 (es) | 2021-06-11 |
CN110366457A (zh) | 2019-10-22 |
EP3554734A1 (de) | 2019-10-23 |
WO2018191828A1 (de) | 2018-10-25 |
JP2020517526A (ja) | 2020-06-18 |
PT3554734T (pt) | 2020-11-25 |
US20200094308A1 (en) | 2020-03-26 |
CH713744A2 (de) | 2018-10-31 |
TWI754004B (zh) | 2022-02-01 |
TW201841803A (zh) | 2018-12-01 |
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