EP3554734A1 - Verfahren und vorrichtung zur herstellung von aufreissdeckeln sowie ein aufreissdeckel - Google Patents
Verfahren und vorrichtung zur herstellung von aufreissdeckeln sowie ein aufreissdeckelInfo
- Publication number
- EP3554734A1 EP3554734A1 EP18703189.3A EP18703189A EP3554734A1 EP 3554734 A1 EP3554734 A1 EP 3554734A1 EP 18703189 A EP18703189 A EP 18703189A EP 3554734 A1 EP3554734 A1 EP 3554734A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tear
- rolled
- sealing
- lid
- heating
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000004033 plastic Substances 0.000 claims abstract description 63
- 229920003023 plastic Polymers 0.000 claims abstract description 63
- 238000004519 manufacturing process Methods 0.000 claims abstract description 23
- 238000007789 sealing Methods 0.000 claims description 87
- 238000010438 heat treatment Methods 0.000 claims description 72
- 238000012545 processing Methods 0.000 claims description 71
- 239000000463 material Substances 0.000 claims description 45
- 238000002844 melting Methods 0.000 claims description 20
- 230000008018 melting Effects 0.000 claims description 20
- 238000000576 coating method Methods 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 9
- 239000011888 foil Substances 0.000 claims description 8
- 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
- 238000005096 rolling process Methods 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 3
- -1 polypropylene Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 239000004088 foaming agent Substances 0.000 claims description 2
- 238000004080 punching Methods 0.000 claims description 2
- 240000007594 Oryza sativa Species 0.000 claims 1
- 235000007164 Oryza sativa Nutrition 0.000 claims 1
- 238000000605 extraction Methods 0.000 claims 1
- 235000009566 rice Nutrition 0.000 claims 1
- 238000005520 cutting process Methods 0.000 description 12
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000001816 cooling Methods 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 230000001939 inductive effect 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
- 238000004891 communication Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 241000282376 Panthera tigris Species 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
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- 229920000728 polyester Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
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- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
- B21D51/44—Making closures, e.g. caps
- B21D51/443—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 the production of tear-open lids according to the preamble of claim 1.
- the invention further relates to a device for the production of tear-open lids according to the preamble of claim 9 and a tear-open lids according to claim 15.
- Tear-off covers are known, for example from DE-U 298 17 592 or from DE-U 92 03 953.
- a liquid, corrosive filling material such as. Salt water
- the bare cut edge of the lid opening can corrode.
- the curling of the area with the cut edge upwards and outwards and with the covering by the tear-open foil provide a certain protection against the influence of the filling material.
- the bare or possibly corroded cutting edge is not visible. However, depending on the aggressiveness of the contents and the storage time of the filled container, traces of corrosion may still be visible.
- the object of the invention is to provide an improved method with which tear-open lids can be produced industrially in very high cadence and at low cost, and in which the number of defective lids having an insufficient cut edge protection practically approaches zero ,
- This object is achieved in the above-mentioned method for the production of tear-open lids in that after rolling in the free end of the collar of the rolled-up area is heated so that at least a partial melting of the plastic material of the strip.
- the rolled-up region comprises at least the actual retort curl, which adjoins the region of the lid ring which forms the sealing surface, and in particular comprises the entire region in which the strip of plastic material is present.
- heating it is meant that the curled portion is brought to a temperature which will permit the plastic material to be melted, although it is not mandatory, but it is preferred that the entire curled portion be brought homogeneously 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 may be enough if the on . the material of the plastic material adjacent to the lid material melts in order to ensure the adhesion of the plastic material to the lidding material.
- the heating is also not limited to the rolled-up area, it may be that the entire lid ring is heated, but is preferably a heating, which is limited or concentrated on the rolled-up area with the strip of plastic material substantially.
- any heat sources can be used.
- the heating of the rolled-up area is preferably carried out prior to the sealing of the tear-off film on the cover ring, so that this is a separate working step in the manufacture of the lid.
- the heating and melting of the plastic material can be performed separately from the heat input, in the sealing of the tear film and it can also be an influence of the heating of the rolled area on the seal avoided. It may be provided between the heating of the rolled-in area and the seal also a cooling of the cover ring, for. Example by an air flow, üm the sealing or the sealing parameters for the sealing of the tear-open film on the cover ring not to influence.
- an inductively operating heating means is used to heat the rolled-up area.
- This produces eddy currents in the metallic de-deco material which cause it to heat up.
- the heating can act on the whole lid ring. It can be provided by the arrangement of the inductive heating means and possibly a concentration of the field lines of the inductive heating by means of pole pieces to produce the eddy currents mainly in the rolled-up area.
- By the inductive heating of the metal material of the cover ring a very rapid heating of the plastic material to the temperature can be effected, at which the melting of the plastic material takes place.
- Inductive heating agents have long been used in the industrial environment for the heating of workpieces and are known to the person skilled in the art and are also commercially available. Alternatively, the heating can also be done with infrared radiation or hot air.
- a heating means contacting the curled area is preferably provided in the sealing tool so that a direct transfer of heat from the heating means to the rolled-in area takes place.
- the heating of the rolled-up area can be performed separately from the seal of the tear-open film on the lid ring, so that the seal is not troubled 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 additionally within the sealing tool.
- the tear-open film When the tear-open film is sealed onto the cover ring, it is known to heat twice, so that first the pre-sealing film is sealed on the cover ring, and in a second step the primary sealing of the tear-off film on the cover ring takes place the temperature of the seal is lower than the temperature of the main seal.
- the heating of the synthetic material of the strip or of the rolled-up region takes place in the second step during the main sealing of the tear-open foil.
- This can avoid that the pre-seal is influenced at the lower temperature by an additional heat input by heating the rolled-up area. Such heat input can be well controlled in the case of the main sealing with the higher sealing temperature.
- plastic material of the strip herein means that the strip comprises or consists of a polymer or a resin and that the heating of the rolled-up area is at least at the melting temperature of the plastic material of the strip. In particular, that the heating of the rolled-up area to a temperature in the range of 100 ° Celsius to 200 ° Celsius, and in particular to a temperature in the range of 140 ° to 180 ° Celsius.
- the upper side of the lid blank forming the heat-sealable sealing surface for the tear-off film is or comprises a polypropylene-modified paint system, or is a polypropylene-laminated coating, or another polypropylene coating is, 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.
- Said choice of material of the plastic strip and the areas mentioned for the heating result in a particularly good connection between the mentioned coatings of the lid blank or lid cover and the plastic strip.
- a foaming agent may be added to the plastic material of the strip, so that when the rolled-up area is heated, foaming takes place which increases the area or surface area of the adhesion.
- the invention is also the task
- the at least one further processing station which is provided in the conveying direction after the third processing station, which is designed for heating, at least the rolled-up region of the tear-open lid ring to at least the melting temperature of the plastic strip, with the.
- Device with the heating of the rolled-up area and the melting of the plastic material of the strip an optimal adhesion of the plastic material on the two sides the lid ring can be achieved, which both adjoin the plastic material of the strip in the rolled-up area.
- the device is a hermetic in the tearing covers thus produced. Tightness of the rolled-in area relative to the contents of the container is achieved, on which the tear-open lid is applied.
- the corrosion cut edge in tear-open which have been produced on a device according to the invention, can be safely avoided.
- the rolled-up area is usually a retort curl, which adjoins the area of the lid ring that forms the sealing surface.
- the heating that can be achieved with the processing station it is meant that the rolled-up area lies on one side Temperature is brought, which allows melting of the Kunststoffmateri- as, - where it is not mandatory, but it is preferred that the entire, rolled-up area is brought to the same homogeneous 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 may be sufficient if the material layer 'of the plastic material adjacent to 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 lid ring is heated, but a heating is preferred which is essentially concentrated in the rolled-up area. Any heat sources can be used for this purpose.
- An induction heating means is preferably provided in the further processing station as the heat source. 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 of plastic. Thus, even with the additional processing station, the high production cadence for tear-open covers can be retained.
- the another processing station can be provided at any point along the conveying path of the device between the processing station which produces the rolled-in 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 cools off the cover rings up to the sealing station. At most, an additional cooling station can be used for cooling, which cools the cover rings, for example with an air flow. Cooling in front of the sealing station has the advantage that the sealing parameters are not influenced by the previous heating up of the cover ring.
- the further processing station is integrated in the at least one sealing station and has a heating means contacting the rolled-up region 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 region in the temperature range from 100 ° C. to 200 ° C., and in particular, in the range from 140 ° to 180 ° C.
- the application station for applying the strip-shaped plastic strip is designed so that a strip with a substantially uniform thickness, in particular a thickness in the range of 0.05 mm to 0.5 mm and in particular with a thickness of about 0.1 mm, can be generated.
- the small thickness of the strip is advantageous for the rapid achievement of the melting temperature.
- the invention relates to a tear-open lid, comprising a circumferential attachment portion, a sealing flange with a sealed on this Tear-open film, and a rolled around the sealing flange, rolled-up area laterally delimits the removal opening, wherein the rolled-up.
- Edge a seal made of a plastic, which term means a polymer or a resin has, which is adhesively bonded by melting the plastic in the rolled-up area with the top and bottom of the tear-open.
- This cover has the. mentioned advantages. Brief description of the drawings
- FIGS. 1 to 5 vertical sectional views through a cover blank, a cover ring and a tear-open lid to explain processing steps in the formation of a tear-open lid;
- FIG. 6 shows a vertical sectional view of a lid ring in the manufacture of a tear-open lid according to the invention
- Figure 7 is an enlarged view of a portion of the cover ring of Figure 6;
- FIG. 8 shows the cover ring of FIG. 7 after
- Figure 9 is an enlarged view of a portion of the cover ring of Figure 8.
- Figure 10 is a plan view of the lid ring of a tear-open
- Figure 11 is a schematic side view of a device according to the invention for the production of ⁇ uf- rissdeckeln. with a cut edge sealed according to the method of the invention
- Figure 12 is a vertical sectional view of a portion of a sealing tool for effecting heating of the curled portion in the sealing tool
- FIG. 13 shows a perspective view of the vertically cut sealing tool of FIG. 12.
- FIG. 1 shows a cover blank 1.
- a stack shows overall 12, holds the corresponds a plurality of such lid blanks "which are stacked and processed individually along the transport path of various processing stations,
- the lid blanks are, for example, round disks made of coated metal and thus protected against corrosion, for example of coated white sheet
- the underside lying above is generally different from the coating of the upper side of the blanks 1 located at the bottom in FIG. 1.
- the conveying device 22 which conveys the lid blanks, the lid rings and the tear-open lids in the production device 20 along the transport path in the direction of the arrow A from one processing station to the next processing station, becomes in particular of two parallel running. Timing belts, formed, on which receptacles are provided for the cover blanks or cover rings, as known to those skilled in WO 2006/017953. Again, this will not be explained further here.
- the processing stations which are known to the fan operator and are shown here only schematically, 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 in the. Processing stations with up and down arrows. At the processing stations, the drive of the processing stations is indicated below the conveying means. This serves to raise and lower the blanks and cover rings and to carry out the respective processing steps.
- the lid blank 1 is inserted.
- Cover ring 2 is formed by ' a middle part 30 of the blank is cut out and disposed of as waste.
- the removal opening of the tear-open lid is formed, which in a later production step is closed with the tear-open film.
- the metal material lies bare 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 up to 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 curls can be different.
- the curl which forms the edge of the removal opening, ensures that the user of the can is protected from the sharp-edged cutting edge 31 when removing the contents of the can.
- the turning station 26 which turns the cover rings follows, s.ö that during further processing, the sealing flange 7 after the turning station in the conveyor 22nd and up in the processing stations.
- the tear-open film 8 is sealed onto the sealing flange, which can take place 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 will not be explained further here. It may be followed by further processing stations, in which an embossing of the sealing foil takes place, the tear-open tab is positioned and a leak test of the seal takes place. This is also. The person skilled in the art and will not be explained further here.
- finished tear-open lids 10 are dispensed whose removal opening 15 is covered by a tear-open foil 8, which is sealed on the sealing flange 7.
- the edge of the removal opening 15 is formed by a (in the position of the cover according to FIG 5) upwardly and outwardly bent retort curl 5.
- the finished tear-open lid 10 can be secured by means of its seam edge 6 on a can jacket (which is indicated in Figure 5 only with a wall portion 11) and thus closes the can. This takes place in the filling operation in which the can has been filled with a filling material.
- the filled can can be opened later by the tear-off film is torn away from the Dedkel- ring means of their tear tab 18, whereby the removal opening 15 is open.
- the procedure known from WO 2015/164986 A1 for applying a strip of plastic material to the rolled-in area and the procedure according to the present invention will be described below, reference being made to the known, previously explained production steps or the known production device if necessary.
- FIGS 6 and 7 show a lid ring in which the processing step of "pulling the edge of the removal " opening to form the collar 4 has already taken place. This has been done in the processing station 24.
- an inward curvature has been generated at the upper end 34 of the collar 4, which facilitates the subsequent introduction into the formation of the retort curl.
- It has also been applied in a single step on the inside 40 of the collar 4, a plastic strip 32. The application of this plastic layer takes place in a separate processing station 29, which is arranged between the drawing station 24 and the curling station 25.
- the band-shaped strip 32 made of the plastic material forms a seal for the cutting edge 31 during the curling, which is shown below.
- the strip 32 is made of a plastic, which term here means a polymer or resin. Such plastics are commercially available and in particular also commercially available in qualities which 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 preserved during the sterilization.
- the strip is, as shown, preferably formed uniformly thick 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 mm to 0.2 mm, preferably a thickness of approximately 0.1 mm.
- the height H of the strip may be, for example, 1 to 3 mm.
- the application is preferably carried out in a manner known to the person skilled in the art from WO 2015/164986 A1 by spraying molten, liquid plastic material, whereby a relative movement of the nozzle and the cover ring takes place.
- the cover ring is moved in rotation in Be ⁇ processing station 29 while the inner side 40 of the collar 4 at the outlet opening of a statically arranged during the application spray nozzle moves past, from which the plastic emerges ..
- the cover ring is thus at the processing station 29th lifted, rotated and the application is activated when the cover ring has reached the correct position relative to the outlet opening.
- the lid ring After at least one complete revolution, when a continuous band or strip is formed on the inside, the lid ring is again moved downwards to the conveyor, whereby the rotation is stopped, so that the lid ring rests again on the receivers of the conveyor can be discontinued.
- the plastic of the belt .32 then cools on application to the cover ring and solidifies, so that no further flow of the plastic takes place during the further conveyance and the belt is stable in the form shown.
- a coolant for example in the form of a blower, can be provided in the application station or processing station 29.
- the distance of the discharge opening or the spray nozzle to the inside 40 of the collar 4 during the spraying of the liquid plastic remains substantially constant, so that the thickness of the strip 32 is substantially constant, and its small thickness becomes possible.
- This can be effected in the manner known from WO 2015/164986 A1.
- the procedure according to WO 2015/164986 A1 for producing the strip 32 is preferred.
- the strip 32 can also be applied to the cover ring in a different manner. So it is possible one This can be done at a separate processing station or when pulling the collar in the station 24 or when rolling the collar in the station 25. In these cases, the station 29 shown would be omitted.
- the strip 32 is positioned on the inner side 40 of the collar 4, that it is closer to the plane of the sealing flange 7 than the cutting edge 31.
- the positioning and dimensioning of the strip is approximately such that the strip 32, the lower third of the Collar 4 to about the lower half of the collar 4 covered.
- a larger height H of the strip is possible, but then increases the cost of materials for the plastic used, without this being necessary for further processing or for the protection of the cutting edge.
- the height H will be approximately 1 mm to 3 mm in practice.
- the lid ring provided with the plastic strip according to FIGS. 6 and 7 is provided in the processing station 25 in a known manner with a retort curl 5.
- This station 25 works with the known rolling-in tools, so that this need not be explained in detail here, since this is known to the person skilled in the art. A modification that is obvious to the person skilled in the art may arise in the case of the tools when the collar 4 has already been pre-bent at its upper edge 34 for insertion, which is preferred.
- FIGS. 8 and 9 which show the lid ring after the turning station 26, the strip 32 forms a seal during the formation of the regular curl 5, which prevents the entry of liquid into the interior of the retort curl.
- the plan view of FIG. 10 shows the cover ring as it is conveyed into the sealing station 27, in which the tear-open film is sealed over the removal opening 15.
- the tear-open lid manufacturing device 20 comprises the processing station 29 for applying the band 32 to the lid ring and the processing station 25 for curling the collar 4.
- the rolled-up edge region is heated in order to melt the strip 32 at least in the contact region to the metal of the cover or the coatings thereon.
- the rolled-in edge region comprises at least the retort curl 5, as can be seen for example in FIG. 9, and in particular the entire part of the tear-open lid covered by the strip 32.
- a processing station 35 is provided in front of the turning station 26, in which processing station 35 the heating of the rolled-up area takes place. This can be done so that even with this processing station 35 a lifting of the lid from the conveyor 22 takes place and then the heating in the processing station and then the depositing on the conveyor.
- the cover ring or its rolled-up region can also be heated in the processing station on the conveyor 22, ie without lifting it off the conveyor.
- the lid ring In the processing station 35 in front of the turning station, the lid ring is still facing up with the retort curl or the curled area, as shown in FIG.
- an induction heating device is provided in the processing station 35, which is shown schematically as block 4.3.
- the design of a Such a heater is known in the art and need not be explained in detail here.
- an induction heating device could also be a. Infrarotstrahlungs- source or a hot air source can be provided.
- the processing station can 'be provided heating of thetientroll- th region after the turning station and is in the example shown in broken lines as a processing station 35' to the illustrated ..
- this processing station of the rolled-up range is below and is correspondingly it is preferred if the heat source acts from below, so that it may be more advantageous to design the processing station 35 'in such a way that the lid ring is lifted off the conveyor 22 in order to carry out the processing with the heat source.
- an induction heater be provided or another type of heating, which is shown only schematically as block 43.
- cooling may be provided, for example by a blower. This is particularly advantageous if the processing station 35 'is present after the turning station 26. and a pre-sealing station 27 is provided for pre-peeling the tear-open film 8 on the sealing flange 7. Otherwise, heating the rolled-up area may result in an undesirable influence on the temperature for the pre-seal.
- the heating of the rolled-up region may be provided in the sealing tool of the sealing processing station.
- the heating of the rolled-up area takes place in the main sealing station 28.
- Figures 12 and 13 show the structure by way of example a sealing tool for the sealing of the tear film and for heating of the rolled-up area.
- FIG. 12 shows a. Detailed illustration of the lower part 36 of the sealing tool, on which a lid ring 2 rests, which has been lifted from the sealing tool 22 by the sealing tool.
- FIG. 13 shows the lower sealing tool in a perspective view and already after the sealing step with the tear-open foil 8 on the lid ring 2
- a suitable side gel foil is then placed on the lid ring and fixed by means of the upper sealing tool (not shown) on the sealing flange 7 by the sealing process, after which the Laying the tear-open on the conveyor 22 is carried out.
- 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 heat the heating means 38 into the rolled-up area for heating the same and melting it To bring in strip 32.
- the heat energy for the heating means 38 is provided in this example by the heating elements 39, which also serve for the heating of the lower sealing tool below the sealing flange 7. These heating elements 39, which are electrically heated, are in direct communication with the sealing tool and are in heat flow communication with the heating means 38 via a heat transfer layer 42. This is a preferred example, but it will be apparent to those skilled in the art that it is the Heat generation for the heating means 38 for the rolled-up area can also be provided in another way. After leaving the sealing station 28 is thus not only the tear film. On the tear-open lid, the adhesion of the strip 32 to the two surfaces of the tear-open lid has also been improved by the melting of the strip 32.
- a tear-open lid 10 with a rolled-up region of the removal opening 15 is thus formed such that, prior to the formation of the rolled-up area Area a plastic strip 32 is applied to the collar of the lid ckelrings. After formation of the rolled-in area, the plastic strip is melted to give good adhesion of the plastic to the top and bottom of the tear-open lid in the rolled-up area. This results in a cost-effective manner and with the possibility of production with high cadence a practically hermetic sealing of the cutting edge 31 of the tear-open.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Closures For Containers (AREA)
- Closing Of Containers (AREA)
- Containers Opened By Tearing Frangible Portions (AREA)
Abstract
Description
Claims
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 true EP3554734A1 (de) | 2019-10-23 |
EP3554734B1 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 (de) |
EP (1) | EP3554734B1 (de) |
JP (1) | JP2020517526A (de) |
CN (1) | CN110366457A (de) |
CH (1) | CH713744A2 (de) |
ES (1) | ES2832878T3 (de) |
PT (1) | PT3554734T (de) |
TW (1) | TWI754004B (de) |
WO (1) | WO2018191828A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20220324010A1 (en) * | 2019-05-09 | 2022-10-13 | Constellium Rolled Products Singen Gmbh & Co.Kg | Method for manufacturing long metal stopper caps comprising a skirt having a constant thickness |
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, Ch | |
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 Lebensmittelwer | Dose |
DE10022553C1 (de) * | 2000-05-10 | 2001-07-05 | Rasselstein Hoesch Gmbh | Verfahren zum Herstellen eines Ringteils aus Blech für einen Dosendeckel |
ES2256219T3 (es) | 2001-03-29 | 2006-07-16 | Industrias Alimentarias De Navarra, S.A. | Cierre para latas, en especial de conserva. |
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 |
WO2006017953A1 (de) | 2004-08-18 | 2006-02-23 | 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 |
CN105216297B (zh) * | 2012-11-02 | 2018-10-30 | 林桂花 | 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 WO PCT/CH2018/000004 patent/WO2018191828A1/de unknown
- 2018-01-25 EP EP18703189.3A patent/EP3554734B1/de active Active
- 2018-01-25 PT PT187031893T patent/PT3554734T/pt unknown
- 2018-01-25 JP JP2019547295A patent/JP2020517526A/ja active Pending
- 2018-01-25 ES ES18703189T patent/ES2832878T3/es active Active
- 2018-01-25 US US16/605,820 patent/US20200094308A1/en not_active Abandoned
- 2018-01-25 CN CN201880014426.9A patent/CN110366457A/zh active Pending
- 2018-02-06 TW TW107104092A patent/TWI754004B/zh not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
PT3554734T (pt) | 2020-11-25 |
ES2832878T3 (es) | 2021-06-11 |
TWI754004B (zh) | 2022-02-01 |
JP2020517526A (ja) | 2020-06-18 |
CH713744A2 (de) | 2018-10-31 |
TW201841803A (zh) | 2018-12-01 |
WO2018191828A1 (de) | 2018-10-25 |
EP3554734B1 (de) | 2020-09-23 |
CN110366457A (zh) | 2019-10-22 |
US20200094308A1 (en) | 2020-03-26 |
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