CN117580771A - Method and device for producing a retractable closure - Google Patents
Method and device for producing a retractable closure Download PDFInfo
- Publication number
- CN117580771A CN117580771A CN202280043675.7A CN202280043675A CN117580771A CN 117580771 A CN117580771 A CN 117580771A CN 202280043675 A CN202280043675 A CN 202280043675A CN 117580771 A CN117580771 A CN 117580771A
- Authority
- CN
- China
- Prior art keywords
- score line
- housing
- sheet
- protrusions
- engraving
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 claims abstract description 30
- 230000002093 peripheral effect Effects 0.000 claims abstract description 14
- 239000007769 metal material Substances 0.000 claims abstract description 9
- 238000005520 cutting process Methods 0.000 claims description 28
- 238000007789 sealing Methods 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 19
- 238000000926 separation method Methods 0.000 claims description 15
- 238000000465 moulding Methods 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000005304 joining Methods 0.000 claims description 2
- 238000010008 shearing Methods 0.000 claims 3
- 230000015572 biosynthetic process Effects 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 239000004411 aluminium Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000002301 combined effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
- B65D41/32—Caps or cap-like covers with lines of weakness, tearing-strips, tags, or like opening or removal devices, e.g. to facilitate formation of pouring openings
- B65D41/40—Caps or cap-like covers adapted to be secured in position by permanent deformation of the wall-engaging parts
- B65D41/42—Caps or cap-like covers adapted to be secured in position by permanent deformation of the wall-engaging parts made of relatively-stiff metallic material, e.g. crown caps
- B65D41/425—Caps or cap-like covers adapted to be secured in position by permanent deformation of the wall-engaging parts made of relatively-stiff metallic material, e.g. crown caps with integral internal sealing means
-
- 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
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/78—Moulding material on one side only of the preformed part
- B29C70/80—Moulding sealing material into closure members
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Closures For Containers (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Abstract
A method for manufacturing a pull-off closure (1) for closing a container, wherein a sheet of metal material is cut and stretched to obtain shells (3) each having a central closing wall (4) and a peripheral skirt wall (5), and wherein after stretching, each shell is scored to obtain at least one circumferentially extending score line (7, 9) forming a preferential tear line which is broken by pulling a tearing element applied to the shell (3).
Description
Background
The present invention relates to a method and/or apparatus for manufacturing a drawable closure, and the drawable closure is particularly useful for closing an outlet of a container such as, for example, a bottle.
In particular, but not exclusively, the present invention relates to a drawable closure, also known as a ring-pull closure or pull-off closure, which is typically made of a metallic material (e.g. aluminium) and is provided with elements (e.g. rings) that can be pulled by a user to separate the closure and open the container.
Patent publications US2019/0263570 A1, JP 2008-174266A, JP H115937A, JP 4065690B2, EP 3037361 A1 and US1,005,046 show specific examples of pull-off closures that can be used to close containers.
Certain aspects of the prior art are modifiable.
First, it is desirable to make the operation easier and more convenient, whereby the consumer pulls the gripping element to open the container, while ensuring a seal of greater safety of the container prior to opening.
Secondly, it is desirable to make a closure which is simple and inexpensive to manufacture, particularly because of the reduced use of build materials, while ensuring the necessary hermetic seal.
Disclosure of Invention
It is an object of the present invention to provide a method and/or apparatus for manufacturing a pull-off closure that overcomes one or more of the aforementioned limitations and disadvantages of the prior art.
It is an object of the present invention to provide a pull-off closure for a container that replaces the pull-off closures of the prior art.
One advantage is that a usable ring-pull closure is produced, the opening of which is particularly easy and convenient and at the same time ensures a high sealing security of the closed container.
One advantage is that the closure is simple and inexpensive to manufacture, especially due to the reduced use of construction materials.
In one embodiment, a method for manufacturing a ring pull closure provides for a cut and stretched sheet of metallic material to obtain a plurality of shells each having a central closure wall and a peripheral skirt wall, and wherein each shell is scored after stretching to obtain at least one circumferentially extending score line forming a preferential tear line by pulling a tear of a gripping element applied to the shell.
Drawings
The invention may be better understood and implemented with reference to the accompanying drawings that illustrate some non-limiting examples of the invention, in which:
FIG. 1 is a side view of a specific example of a drawable closure for a container made in accordance with the present invention;
FIG. 2 is a cross-section of the closure of FIG. 1;
FIG. 3 is a view on the left side of FIG. 1;
FIG. 4 is a cross-section of the housing as part of the closure of FIG. 1 prior to application of the gripping element to the housing;
FIG. 5 is a view on the right side of FIG. 4;
FIG. 6 shows a diagram of a step of scoring a circumferential score line for a manufacturing method of manufacturing the closure of FIG. 1;
fig. 7 shows a diagram of a step of forming a protrusion on a protruding portion of a housing by plastic deformation in the first embodiment;
fig. 8 shows a diagram of a step of forming a protrusion on a protruding portion of a housing by plastic deformation in a second embodiment;
FIG. 8A shows an enlargement of FIG. 8;
fig. 9 shows a diagram of a step of forming a protrusion on a protruding portion of a housing by plastic deformation in a third embodiment;
fig. 9A shows an enlargement of fig. 9.
Detailed Description
With reference to the preceding figures, 1 indicates a whole extractable closure, which is particularly useful for closing the outlet of a container, such as for example a bottle (made of glass, PET, aluminium, etc.).
The extractable closure 1 may in particular comprise a ring-pull or pull-off closure. At least a portion of the extractable closure 1 may in particular be made of a metallic material, for example aluminum. The extractable closure 1 is provided with a gripping element 2 (e.g. a pulling tab or ring) which can be pulled by a user to separate the closure and open the container. The grip element 2 may in particular be made of plastic (e.g. PE).
The extractable closure 1 may in particular comprise a housing 3 or shell comprising a closure wall 4. The housing 3 may in particular be made of a metallic material, for example aluminium. The closing wall 4 may in particular be configured to close the upper outlet of the container. The housing 3 may in particular comprise a skirt wall 5. The skirt wall 5 may in particular be a cylindrical wall.
The skirt wall 5 may in particular extend downwards from the periphery of the closing wall 4 and may in particular be configured for coupling with a neck of a container (for example of a known type).
The housing 3 may in particular comprise a connecting portion 6. The closing wall 4 and the skirt wall 5 can in particular be joined by a connecting portion 6. The grip element 2 may in particular extend from the skirt wall 5 or be applied to the skirt wall 5, and may in particular be configured to be pulled (upwards) by a consumer in order to separate the housing 3 and open the container. The grip element 2 may in particular comprise a pull ring. The grip element 2 may in particular comprise an upper end portion attached to the lower edge of the skirt wall 5. The grip element 2 may in particular extend downwards from the lower edge of the skirt wall 5.
The extractable closure 1 may in particular comprise preferential separation means arranged on the housing 3 to facilitate the separation of the housing 3 when the grip element 2 is pulled. The preferential separation means may comprise, in particular, at least one circumferential score line 7 arranged on the surface of the connecting portion 6 (in particular on the convex outer surface of the connecting portion 6). The circumferential score line 7 may in particular extend over at least a sixth, or at least a fifth, or at least a quarter of the rotation angle in length in order to ensure separation of the housing 3 (by pulling the grip element 2) after the preferential separation member breaks.
The gripping element 2 and the preferential separation means are configured such that by pulling the gripping element 2, the closure portion, which is separated and lifted by the effect of tearing and breaking of the preferential separation means, comprises at least a portion of the closure wall 4 arranged above.
The extractable closure 1 may in particular comprise a sealing member 8 arranged on the inside of the housing 3 (in particular below the closure wall 4) and configured to form a seal on the outlet of the container. The sealing means 8 may comprise, inter alia, a seal applied and molded directly inside the housing 3 by compression molding of plastic (e.g. PE, EVA or other PVC-free material).
The circumferential score line 7 may in particular be arranged in a radially more peripheral position with respect to the sealing member 8, such that the circumferential score line 7 is not superimposed on the sealing member 8.
This configuration of the circumferential score line 7 (on the connecting portion 6 and/or in a radially more peripheral position relative to the sealing means 8) enables the tear opening to be encouraged and a highly airtight seal to the container to be maintained prior to opening. In particular, the operation of tearing to separate the opening may be performed without substantially interfering with the sealing member 8 arranged inside the housing 3.
The preferential separation means may comprise, in particular, at least one further circumferential score line 9, which is arranged on the (external and convex) surface of the connecting portion 6. The further circumferential score line 9 may in particular be spaced apart from the circumferential score line 7 in the circumferential direction. The further circumferential score line 9 may in particular be arranged in a radially more peripheral position with respect to the sealing member 8 such that the further circumferential score line 9 is not superimposed on the sealing member 8. The further circumferential score line 9 may in particular extend over at least one sixth, or at least one fifth, or at least one fourth of the rotational angle in order to ensure that the housing 3 is separated (the grip element 2 is pulled) after the preferential separation member breaks.
The further circumferential score line 9 and the circumferential score line 7 may in particular be arranged symmetrically to each other with respect to a vertical symmetry plane passing through the grip element 2. The circumferential score line 7 may in particular be arranged on the connecting portion 6 (in particular on its outer and convex surfaces) throughout its entire circumferential extent or throughout its most circumferential extent. The further circumferential score line 9 may in particular be arranged on the connecting portion 6 (in particular on its outer and convex surfaces) throughout its entire circumferential extent or throughout its most circumferential extent.
The preferential separation means may comprise, in particular, at least one vertical score and/or connecting line 10, which is arranged on the (outer) side of the housing 3. The vertical score and/or connecting line 10 can be arranged in particular on the skirt wall 5, which ends in the vicinity of the grip element 2. The vertical score and/or the connecting line 10 may be configured in particular to join the grip element 2 to the circumferential score line 7. The preferential separation means may in particular comprise at least one further vertical score and/or connecting line 11 arranged on the (outer) side of the housing 3, in particular to join the grip element 2 to the further circumferential score line 9.
A method for producing a retractable closure for a container, in particular for producing a retractable closure 1, is disclosed.
The method of manufacture may include, inter alia, the step of providing a sheet of metallic material (e.g., aluminum). The manufacturing method may in particular comprise the step of cutting the aforementioned sheet to obtain a plurality of sheet-like bodies. The manufacturing method may in particular comprise the step of stretching the aforementioned sheet-like bodies to obtain from each of the bodies a shell 3 having a central closing wall 4 and a peripheral skirt wall 5.
The manufacturing method may in particular comprise the step of scoring the aforementioned shells 3 after the aforementioned step of stretching to obtain at least one score line extending circumferentially on each of the shells 3. The aforementioned scoring step may in particular be performed such that the circumferentially extending score line is arranged on a convex outer side of the connecting portion of the housing 3, which convex outer side joins the central closing wall to the peripheral skirt wall.
The manufacturing method may in particular comprise a step of applying a sealing member 8 to the inside of the housing 3, which sealing member is intended to form a seal on the outlet of the container. The circumferentially extending score line may in particular be arranged in a radially more peripheral position than the aforementioned sealing member 8, such that the circumferentially extending score line does not overlap the aforementioned sealing member.
The foregoing steps of cutting and stretching may be performed in a press, in particular, by moving the cutting member along a cutting axis and moving the stretching member along a stretching axis coincident with the foregoing cutting axis. The press may comprise, inter alia, an inlet zone for the sheet to be treated, a pressing zone (cutting and stretching), a discharge zone for the waste metal sheet, a zone for collecting the shell. Such presses may comprise, inter alia, presses of known type.
The method of manufacture may comprise, inter alia, the step of forming one or more protrusions 12 on one side of each of the aforementioned sheet-like bodies or the aforementioned housings. In particular, it is possible to form two projections 12 for each sheet-like body or housing. The formation of the one or more projections 12 can be achieved in particular by plastic deformation without the creation of scrap, i.e. parts of material that are integrally separated from the aforesaid sheet-like body or from the aforesaid housing and must then be removed.
The formation of the one or more projections 12 may be made in particular by plastic deformation performed with the punch members 13, 17 (stretching and/or punching and/or cutting members).
Forming one or more protrusions 12 on one side of the article may, particularly in the case of stretching, cause one or more depressions to be formed simultaneously on the opposite side of the article.
Suitable plastic deformation for forming the protrusions 12 may be, for example, without creating scores or through openings in the material in the case of simple stretching, or may be, for example, scoring or through openings in the case of die cutting (without scrap).
The formation of the projections 12 may also include, inter alia, the step of cutting the material with a punch member 17 provided with an "open" cutting profile (i.e. not in the form of a closed loop) such that the deformed material remains attached without releasing scrap.
The formation of the protrusions 12 may especially comprise the formation of side openings or slits and is achieved by means of, for example, stamping of cut material on only one side, resulting especially in protrusions in the shape of a half cone (a kind of tip) or the like.
The punch member with the blade (combined effect of punch and cut) may be configured in particular to deform the material to create the projections and also to cut the material and thus create the relative openings, holes or scores by way of example in a similar manner as machining a metal sheet to form the teeth and holes of a grinder or the teeth and holes of a non-slip baked metal floor.
It should be noted that stamping by means of partial cutting of the non-closed cutting profile (without forming scrap) may further permit the formation of projections defining undercuts, in particular due to the formation of scores or openings or holes in the material. The undercut is defined by the inner surface of the protrusion that defines the aforementioned score, opening or aperture.
The formation of the one or more protrusions 12 may include, inter alia, plastic deformation performed by a punch member 17 provided with at least one blade and configured to form a cut, wherein the at least one protrusion 12 is formed, and furthermore, an opening or hole or through score is formed, with plastic deformation without forming scrap.
The method of manufacture may in particular comprise the step of applying the grip element 2 to each of the aforesaid sheet-like bodies or the aforesaid shells by engaging the end of the grip element 2 with the respective projection 12. This step of applying may in particular comprise the step of directly overmolding (overmoulding) the gripping element 2 on the respective sheet-like body or housing 3 (for example by injection or compression overmolding of plastic). This step of applying may include, inter alia, a step of engaging, for example, by interlocking and/or mechanically forcing the ends of the (previously formed) gripping elements onto the respective protrusions 12.
As noted above, the protrusions 12 may define, among other things, at least one open hole or score in the material. The protrusions 12 may in particular define at least one undercut that may facilitate a subsequent operation of applying the gripping element 2, thereby improving a firm and gripping of the element.
The aforementioned step of forming the one or more protrusions 12 (and the one or more respective recesses) may in particular be performed during the aforementioned step of stretching the sheet-like body or after the aforementioned step of stretching the sheet-like body or during the aforementioned scoring step of scoring the shell or after the aforementioned scoring step of scoring the shell. Each protrusion 12 may be formed on the protruding portion 14 of the housing by means of, inter alia, a punch member 13, 17, which may comprise, inter alia, a small punch and a corresponding small die operating on the protruding portion 14. Each protrusion 12 may protrude from the outer side of the protrusion portion 14 (in the embodiment of fig. 4 and 5) or from the inner side of the protrusion portion 14 (as in the embodiment of fig. 7 to 9).
In particular, as in the embodiment of fig. 4 to 5, each protrusion 12 comprising at least one stretched portion of material without any through openings may be formed by a punch member for stretching (e.g. like punch member 13 in fig. 7). In the embodiment of fig. 8-9, the protrusions 12 comprising at least one cut-out and deformed portions of material having through openings may be formed by each punch and cut punch member, such as, for example, punch member 17 in fig. 8.
The grip element 2 is particularly attachable to the protruding portion 14 of the housing 3. The tab portion 14 may be configured, inter alia, so as to protrude downwardly from the skirt wall 5.
An apparatus for manufacturing a drawable closure, in particular an apparatus useful for manufacturing a drawable closure 1 and for actuating the manufacturing method disclosed above, is disclosed.
The manufacturing apparatus may in particular comprise means for supplying a sheet of metallic material, for example an aluminium sheet. The aforementioned supply means may comprise, inter alia, supply means of a known type (e.g. rollers, belts or mats or magnetic or yet other types of conveyors) and are not disclosed in more detail herein.
The manufacturing apparatus may particularly comprise a cutting member for cutting the sheet supplied by the supply member. The cutting member for cutting may in particular be configured to cut a plurality of sheet-like (e.g. disc-shaped) bodies. The manufacturing apparatus may in particular comprise means for stretching the sheet-like body cut by the cutting means. The stretching means may in particular be configured to make a housing 3 with a central closing wall 4 and a peripheral skirt wall 5 from each stretched sheet-like body. The central closing wall and the peripheral skirt wall may in particular be joined together by a connecting portion 6.
The cutting and stretching means may comprise in particular a single action (cutting and stretching) mechanical press for moulding caps, in particular it is suitable for multi-tool moulds, in particular it is configured to use pre-cut (aluminium) sheets of a particularly known type.
The manufacturing apparatus may in particular comprise means for applying sealing means 8 (gaskets) intended to form a seal on the outlet of the container to the inside of the housing 3. The means for applying the sealing means 8 may comprise, in particular, lining machines of known type, for example.
The manufacturing apparatus may in particular comprise means for scoring the side (in particular, the outer side) of the shell 3 made of the aforementioned tensile means. The scoring member may be configured, inter alia, to form at least one circumferential score line 7 and/or 9 on each shell. The scoring member may in particular be configured such that a circumferential score line is arranged on the connecting portion 6, in particular on a convex surface of the connecting portion (on the outer side of the housing 3).
The scoring member (see the illustration of fig. 6) may include, inter alia, at least one scoring tool 15 and at least one support counter-tool (supporting counter-tool) 16. The scoring tool 15 may be configured, inter alia, to impose at least one circumferential score (in particular, a non-through score) on one side of the housing 3 (in particular, on an exterior side of the housing). The support counter tool 16 may be configured, inter alia, to receive and support the housing 3. The scoring tool 15 and the supporting counter-tool 16 are particularly movable relative to each other to assume at least one closed position, wherein the scoring tool 15 imposes at least one circumferential score 7 or 9 on the outer side of the housing; and at least one open position in which the housing 3 can be inserted into the support counter-tool 16 and/or removed from the support counter-tool 16. In particular, it is possible for each scoring tool 15 to be moved in both directions towards or away from the housing 3 on command in the operating direction F.
The scoring means may in particular be configured so as to form at least one circumferential score line 7 and/or 9 on one side (the outer side) of the housing and/or at least one vertical score line and/or connecting line 10 and/or 11 joining the circumferential score line 7 and/or 9 to the grip element 2.
The manufacturing apparatus may in particular comprise application means for applying the grip element 2 to the skirt wall 5 of the housing 3. The manufacturing apparatus may in particular comprise a treatment line along which the aforementioned application member and the aforementioned scoring member are arranged. The application member may be disposed, in particular, downstream of the scoring member.
The cutting means and the stretching means may in particular be arranged on the same press. The scoring member may be particularly configured on a rotary machine.
The manufacturing apparatus may in particular comprise means for forming one or more protrusions 12 on one side of each of the aforementioned sheet-like body or the aforementioned housing 3 and one or more corresponding recesses on the opposite side of the sheet-like body or the housing 3. The forming means may in particular be configured for forming the protrusions 12 and corresponding recesses by plastic deformation of the punch means 13 or 17 (e.g. by a punch and a drawing or stamping/cutting die).
The manufacturing apparatus may in particular comprise means for engaging the end of the grip element 2 with the respective protrusion 12. Such engagement means may comprise, inter alia, means for over-moulding the gripping element 2 on the respective sheet-like body or housing 3. Such engagement means may comprise, inter alia, means for engagement by interlocking and/or forcing the ends of the gripping elements 2 onto the respective protrusions 12.
Claims (22)
1. A method for manufacturing a pull-off closure (1) for a container, the method comprising the steps of:
providing a metal material sheet;
cutting the sheet to obtain a plurality of sheet-like bodies;
stretching the sheet-like bodies to obtain from each of them a shell (3) having a central closing wall (4) and a peripheral skirt wall (5);
-engraving the shells (3) to obtain at least one circumferentially extending score line (7, 9) on each of them;
characterized in that said engraving step is performed after said stretching step.
2. The method of claim 1, wherein the at least one circumferentially extending score line (7, 9) is arranged on a convex outer side of a connecting portion (6) of the housing, which connects the central closing wall (4) with the peripheral skirt wall (5).
3. Method according to claim 1 or 2, comprising the step of applying on an inner side of the housing (3) a sealing member (8) intended to seal an outlet of a container, the at least one circumferentially extending score line (7, 9) being arranged in a radially more peripheral position with respect to the sealing member (8) such that the at least one circumferentially extending score line does not overlap the sealing member.
4. The method of any one of the preceding claims, comprising the step of forming one or more protrusions (12) on at least one side of each of the sheet-like body or the housing (3), in particular by means of plastic deformation with punch members (13, 17), and the step of applying a gripping element (2) onto each of the sheet-like body or the housing (3) by engaging an end of the gripping element (2) to each of the one or more protrusions (12), in particular comprising the step of over-molding the gripping element (2) onto the respective sheet-like body or housing or joining by interlocking and/or forcibly adding the end to the respective protrusion; the step of forming one or more protrusions (12) is performed in particular during the step of stretching the sheet-like body, or after the step of stretching the sheet-like body, or during the step of engraving the shell, or after the step of engraving the shell.
5. The method of claim 4, wherein the step of forming one or more protrusions (12) comprises a plastic deformation of the material by the punch members (13, 17) without generating scrap.
6. The method of claim 5, wherein the step of forming one or more protrusions (12) comprises a shearing of the material together with the plastic deformation so as to generate, in particular by means of a punch (17) with a cutting edge, for each of the one or more protrusions (12), at least one through opening at least partially defined by the respective protrusion (12) to perform the shearing and plastic deformation together.
7. The method according to claim 5, wherein the forming step comprises a stretching of the material for forming the one or more protrusions (12) on one side and one or more corresponding recesses on an opposite side, in particular the stretching being performed by means of a punch member (13).
8. An apparatus for manufacturing a pull-off closure, in particular an apparatus usable for performing the method according to any one of claims 1 to 7, the apparatus comprising:
means for feeding a sheet of metallic material;
means for cutting a sheet fed by the means for feeding and configured for cutting a plurality of sheet-like bodies;
means for stretching the sheet-like bodies cut from the means for cutting and configured to form from each sheet-like body a housing (3) having a central closing wall (4) and a peripheral skirt wall (5) joined by a connecting portion (6);
means for engraving an outer side of the shells (3) made of the means for stretching and configured to make at least one circumferential score line (7, 9) on each shell;
means for applying a gripping element (2) to the housing (3).
9. The apparatus according to claim 8, wherein the means for engraving are configured such that the at least one circumferential score line (7, 9) is arranged on the connecting portion (6), in particular on a convex surface of the connecting portion.
10. The apparatus of claim 8 or 9, wherein the means for engraving comprises at least one engraving tool (15) and at least one supporting counter tool (16), the at least one engraving tool being configured to imprint at least one score (7, 9, 10, 11) on the outer side of the housing (3), the at least one supporting counter tool (16) being configured to receive and support the housing (3), the at least one engraving tool and at least one supporting counter tool being movable relative to each other to assume at least one closed position, wherein the at least one engraving tool (15) imprints at least one score (7, 9, 10, 11) on the outer side of the housing, and to assume at least one open position, wherein the housing (3) is insertable or removable in the at least one supporting counter tool (16).
11. The apparatus of any one of claims 8 to 10, wherein the means for engraving are configured so as to form at least one circumferential score line on the outer side of the housing and at least one vertical and/or connecting score line (10, 11) engaging the at least one circumferential score line (7, 9) with the grip element (2).
12. The apparatus of any one of claims 8 to 11, comprising a treatment line along which the means for applying and the means for engraving are arranged; the means for applying are arranged in particular downstream of the means for engraving; the means for cutting and the means for stretching are in particular arranged on the same press; the means for engraving are in particular arranged on a rotary machine.
13. The apparatus of any one of claims 8 to 12, comprising means for forming one or more protrusions (12) on one side of each of the sheet-like body or the housing (3), in particular by plastic deformation with punch means (13), and means for engaging an end of a gripping element (2) to a respective one of the one or more protrusions (12); said means for engaging comprise in particular means for over-moulding the grip element (2) on the respective sheet-like body or housing (3); the means for engaging comprise in particular means for engaging by interlocking and/or mechanically strong the ends of the gripping elements (2) to the respective protrusions (12).
14. The apparatus of claim 13, wherein the means for forming one or more protrusions (12) comprises punch means (13, 17) configured to perform a plastic deformation of the material without generating scrap; the punch member comprises, inter alia, a punch member (17) having a cutting edge for performing a shearing of material and said plastic deformation so as to create, for each of said one or more protrusions (12), at least one through opening at least partially defined by said respective protrusion (12); the punch members include, inter alia, punch members (13) to perform a stretching of the material to form the one or more protrusions (12) on one side and one or more corresponding recesses on an opposite side.
15. A pull-off closure comprising:
-a housing (3) comprising a closing wall (4), a skirt wall (5) and a connecting portion (6), the closing wall (4) being configured to close an upper outlet of a container, the skirt wall (5) extending downwardly from a periphery of the closing wall (4) and being configured for coupling with a neck of the container, the closing wall (4) and the skirt wall (5) being joined to each other by means of the connecting portion (6);
a gripping element (2) extending from the skirt wall (5) and configured to be pulled in order to separate the housing (3) and open the container;
preferential separation means, provided on the casing (3) to promote the separation of the casing when the grip element (2) is pulled, comprising at least one circumferential score line (7, 9) provided on a convex external surface of the connecting portion (6).
16. The pull-off closure according to claim 15, comprising one or more protrusions (12) on at least one side of each of the sheet-like body or the housing (3), one end of the gripping element (2) being engaged to each of the one or more protrusions (12) by over-moulding the gripping element (2) on the respective sheet-like body or housing or by interlocking and/or forcibly adding the one end to the respective protrusion.
17. The pull-off closure according to claim 15 or 16, wherein the at least one circumferential score line (7, 9) extends in length for at least one sixth, or at least one fifth, or at least one quarter of a circumferential angle.
18. The pull-off closure according to any one of claims 15 to 17, comprising sealing means (8) arranged on an inner side of the housing (3) and configured to form a seal on the outlet of the container, the at least one circumferential score line (7, 9) being arranged in a radially outermost position with respect to the sealing means (8) such that the at least one circumferential score line (7, 9) is not superimposed on the sealing means (8).
19. The pull-off closure according to any one of claims 15 to 18, wherein said preferential separation means comprises at least one further circumferential score line (7, 9) provided on said convex outer surface of said connecting portion (6); the at least one further circumferential score line (9) is spaced apart from the at least one circumferential score line (7), in particular in a circumferential direction; the at least one further circumferential score line extends in particular over at least one sixth, or at least one fifth, or at least one quarter of the length of a circumferential angle.
20. A pull-off closure according to claims 19 and 18, wherein the at least one further circumferential score line (9) is arranged in a radially outermost position with respect to the sealing member (8) such that the at least one further circumferential score line is not superimposed on the sealing member.
21. The pull-off closure according to claim 19 or 20, wherein the at least one further score line and the at least one score line are arranged symmetrically with respect to each other for a vertical symmetry plane passing through the grip element (2).
22. The pull-off closure according to any one of claims 15 to 21, wherein the preferential separation means comprise at least one vertical and/or connecting score line (10, 11) arranged on an external side of the housing (3), the at least one vertical and/or connecting score line (10, 11) being arranged on the skirt wall (5) and ending in the vicinity of the grip element (2) in order to engage the grip element (2) with the at least one circumferential score line (7, 9).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT102021000020825A IT202100020825A1 (en) | 2021-08-02 | 2021-08-02 | Method and apparatus for the production of removable closures |
| IT102021000020825 | 2021-08-02 | ||
| PCT/IB2022/056618 WO2023012557A1 (en) | 2021-08-02 | 2022-07-19 | Method and apparatus for producing extractable closures |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117580771A true CN117580771A (en) | 2024-02-20 |
Family
ID=78463735
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202280043675.7A Pending CN117580771A (en) | 2021-08-02 | 2022-07-19 | Method and device for producing a retractable closure |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP4380873A1 (en) |
| CN (1) | CN117580771A (en) |
| IT (1) | IT202100020825A1 (en) |
| MX (1) | MX2024001611A (en) |
| TW (1) | TW202311126A (en) |
| WO (1) | WO2023012557A1 (en) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1005046A (en) | 1911-05-17 | 1911-10-03 | Casper W Leinen | Window-fastener. |
| FR1396006A (en) * | 1964-04-22 | 1965-04-16 | American Flange & Mfg | Improvements to light metal stopper caps and their manufacturing process |
| US4003488A (en) * | 1975-05-29 | 1977-01-18 | American Flange & Manufacturing Co., Inc. | Tear open bottle cap |
| IE44386B1 (en) * | 1976-03-15 | 1981-11-04 | American Flange & Mfg | Tear-open bottle cap |
| IT1180698B (en) * | 1984-04-12 | 1987-09-23 | Italcaps Spa | CAPSULE FOR BOTTLES |
| JPH1115937A (en) | 1997-06-26 | 1999-01-22 | Hitachi Ltd | Series checking method |
| JP4065690B2 (en) | 2001-12-28 | 2008-03-26 | 日本クラウンコルク株式会社 | Easy-open container lid |
| JP5038730B2 (en) | 2007-01-18 | 2012-10-03 | 日本クラウンコルク株式会社 | Easy-open container lid |
| JP6356951B2 (en) | 2013-08-22 | 2018-07-11 | 日本クロージャー株式会社 | Easy-open container lid |
| IT201600109454A1 (en) * | 2016-10-28 | 2018-04-28 | Pelliconi & C Spa | CLOSURE CLOSURE FOR CONTAINERS. |
-
2021
- 2021-08-02 IT IT102021000020825A patent/IT202100020825A1/en unknown
-
2022
- 2022-07-19 CN CN202280043675.7A patent/CN117580771A/en active Pending
- 2022-07-19 EP EP22747131.5A patent/EP4380873A1/en active Pending
- 2022-07-19 MX MX2024001611A patent/MX2024001611A/en unknown
- 2022-07-19 WO PCT/IB2022/056618 patent/WO2023012557A1/en active Application Filing
- 2022-07-21 TW TW111127370A patent/TW202311126A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| TW202311126A (en) | 2023-03-16 |
| MX2024001611A (en) | 2024-02-27 |
| IT202100020825A1 (en) | 2023-02-02 |
| EP4380873A1 (en) | 2024-06-12 |
| WO2023012557A1 (en) | 2023-02-09 |
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