WO2021009119A1 - Procédé et dispositif de fabrication de couvercles arrachables ainsi que couvercles arrachables - Google Patents

Procédé et dispositif de fabrication de couvercles arrachables ainsi que couvercles arrachables Download PDF

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Publication number
WO2021009119A1
WO2021009119A1 PCT/EP2020/069751 EP2020069751W WO2021009119A1 WO 2021009119 A1 WO2021009119 A1 WO 2021009119A1 EP 2020069751 W EP2020069751 W EP 2020069751W WO 2021009119 A1 WO2021009119 A1 WO 2021009119A1
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WO
WIPO (PCT)
Prior art keywords
collar
tear
lid
cover
strip
Prior art date
Application number
PCT/EP2020/069751
Other languages
German (de)
English (en)
Inventor
Peter Taiana
Original Assignee
Soudronic Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Soudronic Ag filed Critical Soudronic Ag
Publication of WO2021009119A1 publication Critical patent/WO2021009119A1/fr

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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
    • B21D51/44—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
    • 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
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/0221—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work characterised by the means for moving or conveying the objects or other work, e.g. conveyor belts
    • B05B13/0228—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work characterised by the means for moving or conveying the objects or other work, e.g. conveyor belts the movement of the objects being rotative
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/0221—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work characterised by the means for moving or conveying the objects or other work, e.g. conveyor belts
    • B05B13/0242—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work characterised by the means for moving or conveying the objects or other work, e.g. conveyor belts the objects being individually presented to the spray heads by a rotating element, e.g. turntable
    • 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
    • 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
    • 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
    • B65D2517/504—Details of preformed openings
    • B65D2517/5043—Details of preformed openings provided with a flange
    • B65D2517/5045—Down-turned flange, i.e. extending into container
    • B65D2517/5048—Down-turned flange, i.e. extending into container rolled or folded back, e.g. to avoid sharp edges
    • 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
    • B65D2517/504—Details of preformed openings
    • B65D2517/5056—Details of preformed openings the edge of the preformed opening having a covering element or coating, e.g. to prevent cutting or for sealing purposes
    • 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
    • B65D2517/504—Details of preformed openings
    • B65D2517/507—Unusual details
    • 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
    • B65D47/00—Closures with filling and discharging, or with discharging, devices
    • B65D47/36—Closures with frangible parts adapted to be pierced, torn, or removed, to provide discharge openings

Definitions

  • the invention relates to a method for the manufacture of tear-open lids, a device for the manufacture of tear-open lids and a tear-open cover according to the respective independent claim.
  • Tear-open lids are used to close containers and are typically used in the food industry for packaging food.
  • the tear-off lids comprise a lid ring which is attached to the opening of the container.
  • a tear-off film is attached to the lid ring, which must be peeled off before the contents of the container are consumed. If such a container, which is closed with the tear-off lid, contains a liquid, corrosive filling material such as salt water, the bare cut edge of the lid opening of the container can corrode.
  • retort curl there is a certain degree of curling of the area with the cut edge upwards and inwards and with the overlap by the tear-off film Protection against the influence of the product.
  • WO-A 02/790041 mentions in passing that the can in the Einrol ⁇ lung resulting gap with the heat-sealable coating of the tear-open fill, without explaining how this would tatsumble Lich feasible in the industrial production of Aufreissfolien.
  • Known tear-off foils are only provided with a very thin heat-sealing layer and it is not apparent to the person skilled in the art how this layer can be used to fill the gap when a heat-sealing known to the person skilled in the art is carried out.
  • the possibility mentioned in WO-A 02/790041 can therefore hardly be implemented in practice.
  • WO 2018/191828 Al suggests that the collar is placed a band-shaped strip of plastic on ⁇ on the inside of the collar before the curling of the free end. Nonetheless, even with this solution, in rare cases the contents of the container may come into contact with the cut edge, making the view unappetizing for the consumer.
  • the invention is based on the object of creating a method and a production device for tear-open lids, with which a tear-open lid can be produced industrially at high rates and at low costs, and that too In the case of corrosive products, the possibility of contamination of the contents due to corrosion of the cut edge is minimized.
  • the object is achieved in a first aspect of the invention with a method for producing tear-open lids according to claim 1 and in a second aspect of the invention with a device for producing tear-open lids according to claim 10.
  • the product is also prevented from collecting between the curling and the tear-off film, with the cut edge being protected from corrosion at the same time. This minimizes the risk of the user himself or the rest of the product in the container comes into contact with this accumulation of product after peeling off the tear-off film. Last but not least, the appearance is improved after peeling off the tear-off film because the user does not see any "dirty" curling.
  • the preferred positioning of the ring-shaped strip in the corner area on the outside of the collar is advantageous for reverse curl, as this offers very good stability due to the partially horizontal application, in contrast to a completely vertical application on the wall of the collar.
  • the invention is based on the object of creating a tear-open cover which does not have the disadvantages mentioned and which can be produced industrially in a high rate and quality at low cost. This object is achieved with a tear-off cover with the features of claim 15.
  • FIG. 1 shows a schematic side view of an apparatus for producing tear-open lids
  • FIG. 2 shows a vertical sectional view of a cover ring in the production of a tear-open cover according to the invention
  • FIG. 3a shows an enlarged view of part of the cover ring from FIG. 2 after further manufacturing steps in a first embodiment
  • FIG. 3b shows an enlarged view of part of the cover ring from FIG. 2 after further manufacturing steps in a second embodiment
  • FIG. 4 shows a schematic representation of the processing station for applying the seal, in particular with the positioning of the application nozzle for applying the plastic for a tear-off lid with reverse curl;
  • FIG. 5 shows the cover ring from FIG. 2 after a roll of the edge of the removal opening
  • FIG. 6 shows a plan view of the cover ring of a tear-open cover with retort curl
  • FIG. 7 shows a plan view of the cover ring of a tear-off cover with reverse curl.
  • FIG. 1 shows schematically an apparatus for producing tear-open lids.
  • Fig. 2 shows a vertical sectional view of a cover ring in the production of a tear-open cover according to the invention and FIG. 3a and 3b each show an enlarged view of part of the cover ring of FIG. 2, each with a different embodiment of the annular strip 32.
  • FIG. 1 shows schematically an apparatus for producing tear-open lids.
  • FIG. 2 shows a vertical sectional view of a cover ring in the production of a tear-open cover according to the invention and
  • FIG. 3a and 3b each show an enlarged view of part of the cover ring of FIG. 2, each with a different embodiment of the annular strip 32.
  • a stack 12 which contains a plurality of cover blanks 1, which are individually stacked and processed along the transport path by various processing stations, with cover rings 2 being formed from the cover blanks 1 first and then up to the finished tear-off cover 10 further processed who the.
  • the cover blanks 1 are, for example, round disks made of coated metal that is largely protected against corrosion, such as tin-coated steel, also known as tinplate, or tin-free steel (Tin Free Steel; TFS). Under TFS one with an electrolytic Applied chrome coating provided steel (Electro- lytic Chromium Coated Steel, ECCS) understood. In the context of this invention, TFS has proven to be particularly well suited because, due to the electrolytic deposition of the chromium, it provides a good substrate for the further processing steps (good adhesion for paints).
  • the sheet metal is on both sides, at least in the relevant areas of the sealing flange 7 and of the collar 4, with respect to the inside of the lid 41a, 41b, preferably on the entire inside of the lid 41a, 41b with a lacquer layer described in more detail in the context of the present invention.
  • the outer lacquer layer can be different from the inner lacquer layer, but in the context of this invention it should at least have similar properties, in particular with regard to the polarity and the melting points.
  • the same paint is preferably used for both paint layers.
  • primer In order to improve the adhesion of the paint layer on the sheet metal, it has been found to be preferred to provide the sheet metal with a primer before the paint is applied.
  • Primers or adhesion promoters for metal surfaces are known and commercially available. The choice of primer depends, among other things, on the composition of the paint whose adhesion it is intended to improve. Since the chrome coating is oxidized in the contact area with air, adhesion can be achieved, for example, by means of special silanes which, in addition to the silanol groups, contain functional groups that are also part of paint components. In addition, suitable primers do not contain any wax components. In the context of this invention, suitable paints contain at least one component which is liquid at room temperature and which can be a resin component and / or a solvent.
  • Thermosetting epoxy resins such as epoxyphenol resins, or polyester resins, for example, are suitable as resin components.
  • Another type of lacquer contains thermoplastic materials in particle form in a solvent, in which they dissolve when the temperature rises, so that when the solvent is removed they form a continuous film with a suitably high melting point.
  • One such type of product based on polyvinyl chloride is known as an organosol.
  • heat-sealable materials polyolefins are usually used in pure form or in a mixture with one another, such as polyethylene, polypropylene and mixtures thereof.
  • the heat-sealable materials can be added to the thermally hardening or thermally layer-forming lacquer, e.g. in particle form.
  • a lacquer coating (including the heat-sealable layer) comprises epoxy and polypropylene, for example in an amount ratio of 80:20 to 95: 5, preferably 85:15 to 90:10, such as 88:12.
  • the strip 32 is usually a thermoplastic plastic that contains at least one polyolefin or consists of at least one polyolefin.
  • polyolefins are polyethylene, polypropylene and mixtures of the same, in particular a mixture of polypropylene and polyethylene with a melting point of about 150.degree.
  • modified polyolefins such as graft polymers and / or block polymers which, due to functional groups, optimize the adhesion to the cut edge 31, for example.
  • All materials that have to be melted on application should have a melting point which - if the lid is subjected to thermal sterilization - is at least 10 ° C, preferably at least 20 ° C above the sterilization temperature, for reasons the process economy should be as low as possible, ie at a sterilization temperature of approx. 130 ° C, preferably at approx. 150 ° C.
  • layer thicknesses for the primer from 5 to 15 ⁇ m, preferably from 7 to 12 ⁇ m and for the lacquer layer (including a heat-sealable layer) from 5 to 12 ⁇ m are provided preferably from 5 to 8 p advantageous.
  • the cover blanks 1 have, for example, a diameter of 11 cm. These blanks have already been preformed on their edge 6 by a processing machine, not shown, and the formation of the edge 6 is later used to attach the finished tear-off cover to a container or a can by means of a folded joint. This is known to the person skilled in the art and is not explained further here.
  • a conveying device 22 (Fig. 1), 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 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 cover blanks or cover rings are provided, as is known to the person skilled in the art from WO 2006/017953 and is therefore not explained further here.
  • the blank cover to be processed is lifted from the conveyor device, processed by the processing station and returned to the conveyor device. This is indicated in the editing stations with arrows pointing up and down.
  • a cover ring 2 is first formed from the cover blank 1 by cutting a central part of the blank and discarding it as waste. This becomes the Removal opening 15 (see Fig. 6 or 7) of the later loading container formed, which is closed in a later manufacturing step with the tear-off film. Following the removal opening 15, there remains an initial flange 44 (see FIG. 2), which is further processed later. The metal material lies bare at the cutting edge 31 of the initial flange or the sheet metal of the cover ring 2 is no longer protected there by the coating. In a processing station 23, the edge of the initial flange 44 is pulled up to form a collar 4 with reference to FIG. 2. As can be seen from the synopsis of FIGS.
  • the initial flange 44 is divided into two sections, which result from the drawing of the initial flange in a drawing station 24.
  • a portion of the above-mentioned collar 4 and a further section having 7 gekennzeich ⁇ net and represents the sealing flange that is later than the upper surface ⁇ serves to Aufworthyelung the tear-off foil.
  • the two sections form a corner region 45, which is indicated in FIGS. 3a and 3b with the corresponding arrow.
  • the collar 4 has an inner side 40 of the collar facing the removal opening and an outer side 41a of the collar facing away from the removal opening, and the cover blank 1, the cover ring 2 and the tear-off cover 10 have an outer side 7, 40 and an inner side 41a, 41b of the cover.
  • a strip 32 which is ring-shaped with respect to the circumference of the cover ring and is essentially triangular in cross-section
  • a strip 32 which is ring-shaped with respect to the circumference of the cover ring, is essentially L-shaped in cross-section
  • the ringför-shaped strip 32 is made of thermoplastic material and bil det in the later curling of the collar 4 a sealing device for the cut edge 31, which will be described below.
  • the application of the annular strip 32 according to the invention is carried out by applying molten, liquid plastic material in an application station 24a (according to the third processing station), which is arranged between the drawing station 24 and a rolling station 25, by means of an application nozzle 3, what in Fig. 4 is shown.
  • the application nozzle 3 comprises an outlet opening 3a which is designed in terms of shape such that the annular strip 32 fills the corner area 45 and is thus essentially triangular, which can be seen in FIG. 3a.
  • the outlet opening can, for example, also be shaped in such a way that the annular strip 32 is applied in a substantially uniform thickness d2 over its entire width.
  • width is understood to mean the sum of the two strip legs S1 and S2 shown in FIG. 3b.
  • the length of the two legs S1 and S2 need not be the same in both embodiments from FIGS. 3a and 3b and it can in each case vary, depending on the dimensions (diameter) of the tear-off cover to be produced or depending on the size ratios between the removal opening and the ring width of the cover ring. In the context of FIGS that has a larger / smaller and / or differently shaped exit opening.
  • the strip 32 preferably has a thickness d2 in the range from 0.05 millimeters to 0.5 millimeters, preferably a thickness of approximately 0.1 millimeters.
  • the application station 24a comprises a spacer element (not shown) to maintain an essentially constant distance between the application nozzle 3 and the outside 41a of the collar 4, so that the annular strip 32 in the triangular embodiment (Fig. 3a) an im Essentially constant maximum thickness dl, in particular a maximum thickness dl of 0.4 mm, over its entire length and, in the embodiment from FIG. 3b, in addition to its essentially constant thickness d2 over its entire width, also has an essentially uniform thickness d2 over its entire length.
  • the length here denotes the total circumference of the annular strip. The term “fully” in this text also refers to this.
  • the distance between the outlet opening 3a remains essentially constant when the liquid plastic is applied, so that the thickness d2 or the maximum thickness dl of the strip 32 is essentially constant and the strip can be made thin.
  • This can be done, for example, in that the cover ring 2 is precisely centered on a receptacle in the processing station 29 and the application nozzle 3 with the outlet opening is at a defined distance from this receptacle Transfer from the conveyor with a subsequent centering takes time, however, so that for the very high manufacturing cadences that are aimed for, it is preferred that the cover ring in the processing station is pressed with the collar outside 41a against a roller that is precisely positioned with respect to the nozzle position during application is, whereby the distance between the application nozzle z ur collar outside 41a is precisely defined in a simple manner.
  • the application nozzle 3 is preferably stationary in egg ner application position for the annular strip 32.
  • the cover ring is moved in a rotating manner in the processing station 29 and the outside of the collar 41a is moved past the outlet opening 3a of the application nozzle in order to apply the plastic in liquid form to the rotating cover ring via the application nozzle 3.
  • the application nozzle could be moved around the cover ring while the cover ring would keep stationary ge.
  • this alternative is not preferred, as compliance with the required strip thickness would be more difficult and the process would take longer.
  • the application station 24a comprises a pivot element (not shown) for pivoting the cover ring 2 from a Zu Entryspo position in which the cover ring can be guided into the application station (usually horizontal), into the Aufbringpo position, and back.
  • a pivot element for pivoting the cover ring 2 from a Zu Entryspo position in which the cover ring can be guided into the application station (usually horizontal), into the Aufbringpo position, and back.
  • an application in the horizontal position of the cover ring is also possible, as is shown in FIG.
  • the processing station 29 comprises a heated supply line and a heated and controllable valve (not shown), wherein the application nozzle 3 can be supplied via the valve with the melted plastic, which passes through the channel 3b to the application opening 3a.
  • application is preferably understood here as application and not as spraying. In this way, a shape-related better defined strip is achieved.
  • the cover ring 2 is thus raised at the processing station 29, possibly pivoted, rotated ver and the application is activated when the cover ring has reached the correct position relative to the outlet opening 3 a of the application nozzle 3.
  • the cover ring with the strip 32 is moved back down to the conveyor device, the rotation being stopped so that the cover ring is placed back onto the receptacles of the conveyor device 22 can be.
  • the cover ring can be rotated at high speed during the application of the thin plastic strip, including a rotation with more than 200 revolutions per minute is understood. A preferred speed of rotation is in the range from 400 to 600 per minute.
  • a coolant for example in the form of a fan, can be provided in the application station 24a or processing station 29.
  • the bare cut edge 31 is protected against the influence of a liquid in the later container. It does not matter whether the curling takes place in such a way that the cut edge 31 is partially embedded in the band 32 or whether it only lies against the band 32. Even the opposite, that the cut edge 31 cuts through the band 32 and rests on the metal of the collar outer side 41a, does not interfere with the function of the strip 32. In one embodiment, however, it is preferred if the cut edge 31 is within the reverse curls is as shown in FIG. In any case, it is only important that the curl is in full contact with the strip 32 and thus a sealing effect is achieved.
  • the curl is heated in order to at least partially melt the strip 32 at least in the contact area to the metal of the lid or the coatings located thereon and thus to establish a good connection, which will be explained below.
  • a processing station 35 in front of the turning station 26 is provided, in which processing station 35 the heating of the curling takes place.
  • This can be carried out in such a way that the cover is also lifted off the conveyor 22 at this processing station 35, followed by heating in the processing station 35 and then placing it on the conveyor.
  • the cover ring or its curling can, however, also be heated in the processing station 35 while it is located on the conveying means 22, that is to say without being lifted off the conveying means.
  • the cover ring is still facing up with the curl. This enables heating from above.
  • an induction heating device is preferably provided in the processing station 35.
  • the design of such a Walkereinrich device is known to the person skilled in the art and need not be explained in more detail here.
  • an induction heating device an infrared radiation source or a hot air source could also be provided.
  • the processing station for heating the roll-up can be provided after the turning station and is shown in the example shown as processing station 35 '.
  • the curling is at the bottom and accordingly it is preferred if the heat source acts from below, so that it may be more advantageous to design the processing station 35' so that the cover ring 2 is lifted from the conveyor 22 in it to carry out the processing with the heating source.
  • induction heating or another type of heating 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 is also provided for presealing the tear-open film on the sealing flange 7. Otherwise, heating up the curl can lead to a undesired influence on the temperature for the preseal gel.
  • the heating of the curling can be provided in a sealing station, which is preferably divided into a pre-sealing station 27 and a main sealing station 28.
  • Fig. 5 shows this position, which corresponds to the intended use of the tear-open cover.
  • the cover ring is thus conveyed into the sealing station, in which the tear-open film is sealed over the removal opening 15.
  • the tear-off film is completely sealed onto the area shown by arrow 7. This takes place in two stages with the pre-sealing station 27 and the 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 a leak test is carried out. This is also known to the person skilled in the art and is not explained further here.
  • tear-off lids 10 are issued, the removal opening 15 of which is spanned by a tear-off film (not shown) which is sealed on the sealing flange 7.
  • FIG. 6 which shows a tear-off lid 10a with retort curl
  • FIG. 7 which shows a tear-off lid 10 with reverse curl
  • the difference can be seen that with retort curl the curling with the annular strip 32 is visible from above when the tear-off film is pulled from the removal opening 15.
  • the solution with the reverse curl, the curl and the strip 32 are not visible, since in this view they have been carried out downwards and towards the outside of the collar 41a.
  • the solution with reverse-curl has the important advantage that no product can collect between the roll and the tear-off film.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)

Abstract

L'invention concerne un procédé de fabrication de couvercles arrachables (10) dans lequel une ébauche de couvercle (1) est traitée des deux côtés avec une laque, un anneau de couvercle (2) présentant une ouverture de prélèvement centrale (15) entourée d'une flasque initiale (44) est formé à partir de l'ébauche de couvercle (1), une flasque de scellement (7) et un collier (4) faisant saillie à partir de la flasque de scellement (7) sont formés par emboutissage, une bande annulaire (32) en matière thermoplastique compatible avec la couche de laque est appliquée sur le collier (4) sur une face extérieure du collier (41a) opposée à l'ouverture de prélèvement (15) ou sur une face intérieure du collier (40) tournée vers l'ouverture de prélèvement, le collier (4) est respectivement formé à son extrémité libre (31) vers la face extérieure du collier (41a) ou vers la face intérieure du collier (40), jusqu'à ce que l'enroulement (33) entre entièrement en contact avec la bande annulaire (32) et qu'un film d'arrachage soit scellé sur une surface de scellement de la flasque de scellement (7).
PCT/EP2020/069751 2019-07-18 2020-07-13 Procédé et dispositif de fabrication de couvercles arrachables ainsi que couvercles arrachables WO2021009119A1 (fr)

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CH00921/19A CH716413A1 (de) 2019-07-18 2019-07-18 Verfahren und Vorrichtung zur Herstellung von Aufreissdeckeln sowie Aufreissdeckel.
CH00921/19 2019-07-18

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0510488A1 (fr) * 1991-04-22 1992-10-28 Tenryu Chemical Industry Co., Ltd. Couvercle pour récipient à ouverture large et son procédé de fabrication
EP1153840A1 (fr) 2000-05-10 2001-11-14 Rasselstein Hoesch GmbH Procédé de fabrication d'un anneau en tôle pour un couvercle de boíte
WO2006017953A1 (fr) 2004-08-18 2006-02-23 Soudronic Ag Procede et dispositif pour le transport d'objets a usiner
WO2006097005A1 (fr) * 2005-03-17 2006-09-21 Soudronic Ag Couvercle a ouverture facile et son procede de production
JP2008137711A (ja) * 2006-12-04 2008-06-19 Hokkai Can Co Ltd 缶蓋
EP2055736A1 (fr) * 2006-08-21 2009-05-06 Toyo Seikan Kaisya, Ltd. Composition thermofusible pour boite métallique et boite métallique utilisant cette même composition
WO2018125895A1 (fr) * 2016-12-28 2018-07-05 Swimc, Llc Emballage de résines de revêtement dérivées de réactions de phénols avec des terpènes polyoléfiniques
WO2018191828A1 (fr) 2017-04-21 2018-10-25 Soudronic Ag Procédé et dispositif pour la fabrication de couvercles arrachable ainsi que couvercles arrachable

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19506477A1 (de) * 1995-02-24 1996-08-29 Lauterberger Verpackungs Gmbh Verfahren zur Herstellung von Gebinden und Vorrichtung zur Durchführung des Verfahrens
CH709571A1 (de) * 2014-04-29 2015-10-30 Soudronic Ag Verfahren und Vorrichtung zur Herstellung von Aufreissdeckeln sowie ein Aufreissdeckel.

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0510488A1 (fr) * 1991-04-22 1992-10-28 Tenryu Chemical Industry Co., Ltd. Couvercle pour récipient à ouverture large et son procédé de fabrication
EP1153840A1 (fr) 2000-05-10 2001-11-14 Rasselstein Hoesch GmbH Procédé de fabrication d'un anneau en tôle pour un couvercle de boíte
WO2006017953A1 (fr) 2004-08-18 2006-02-23 Soudronic Ag Procede et dispositif pour le transport d'objets a usiner
WO2006097005A1 (fr) * 2005-03-17 2006-09-21 Soudronic Ag Couvercle a ouverture facile et son procede de production
EP2055736A1 (fr) * 2006-08-21 2009-05-06 Toyo Seikan Kaisya, Ltd. Composition thermofusible pour boite métallique et boite métallique utilisant cette même composition
JP2008137711A (ja) * 2006-12-04 2008-06-19 Hokkai Can Co Ltd 缶蓋
WO2018125895A1 (fr) * 2016-12-28 2018-07-05 Swimc, Llc Emballage de résines de revêtement dérivées de réactions de phénols avec des terpènes polyoléfiniques
WO2018191828A1 (fr) 2017-04-21 2018-10-25 Soudronic Ag Procédé et dispositif pour la fabrication de couvercles arrachable ainsi que couvercles arrachable

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CH716413A1 (de) 2021-01-29

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