EP3887272A1 - Couvercle pour un corps de contenant, en particulier pour un contenant du genre boîte de conserve - Google Patents
Couvercle pour un corps de contenant, en particulier pour un contenant du genre boîte de conserveInfo
- Publication number
- EP3887272A1 EP3887272A1 EP19806267.1A EP19806267A EP3887272A1 EP 3887272 A1 EP3887272 A1 EP 3887272A1 EP 19806267 A EP19806267 A EP 19806267A EP 3887272 A1 EP3887272 A1 EP 3887272A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- downstream
- zone
- stiffening
- upstream
- longitudinal
- 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
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
- B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
- B65D17/28—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness
- B65D17/401—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness characterised by having the line of weakness provided in an end wall
- B65D17/4011—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness characterised by having the line of weakness provided in an end wall for opening completely by means of a tearing tab
Definitions
- the present invention relates generally to the field of metal covers for a container body, in particular for a container of the metal tin can type.
- metal covers comprising a central part comprising a removable part delimited by a line of initiation of rupture and which is equipped with an opening member.
- Some metal containers (mainly cans for packaging foodstuffs) are provided with an opening system called “easy” (or “Easy Open End”), avoiding the use of a tool like can opener during of the opening.
- a particularly interesting solution consists of a one-piece cover comprising a peripheral ring associated, by means of a line of initiation of rupture, with a central panel.
- This central panel is also equipped with an opening member (for gripping and pulling), commonly known as the "opening ring”.
- This type of opening member conventionally comprises successive parts along its length: a perforating peripheral part and a central gripping part, formed along a longitudinal axis and on either side of a fixing part with the removable part. of the central panel.
- the user grasps the grip part of the opening member, then moves the latter away from the associated central panel.
- the opening member then forms a kind of lever, rotated by the user at its peripheral end in the form of a support spout, which causes the breaking line to break.
- the central panel generally undergoes folding phenomena along lines oriented transversely to the general line of traction.
- the torn part of the panel tends to come to curl / bend opposite its part which is not yet torn.
- stiffening moldings are also useful for improving the resistance to pressure, and the rigidity in the face of forces and shocks.
- stiffening moldings are capable of generating an unfavorable opening force curve, which leads the consumer to exert increased and discontinuous traction energy for the opening of the cover.
- the central panel is likely to go back, giving the impression of not having progressed in the tearing process.
- the present invention provides a new cover structure with opening ring, which aims to optimize / reduce the traction energy necessary for opening.
- a cover is proposed according to the invention for a container body, in particular for a container of the metal tin can type, which cover comprises:
- peripheral part adapted to be secured to said container body, which central part comprises a removable part which is delimited by a line of initiation of rupture and which is equipped with an opening member,
- breaking line has two long sides connected by two short sides
- opening member comprises a perforating peripheral part and a central gripping part, arranged along a longitudinal axis and on either side of a fixing part with said removable part.
- said removable part comprises at least two successive zones, taking into account the direction of tearing of the line of initiation of rupture during the operation of the opening member, namely:
- a folding zone provided upstream of said downstream stiffening zone, delimited laterally by an intermediate portion of the two long sides.
- Said downstream stiffening zone comprises at least one stiffening molding arranged to impart longitudinal flexural strength to said downstream stiffening zone (in the direction of tearing of the line of failure initiation) during the tearing of said line d initiation of rupture.
- said folding zone comprises a transverse virtual axis, extending between said intermediate portions of the two long sides, defining a fold line (advantageously a plastic deformation) generated on said removable part during the tearing of said intermediate portions.
- Such a folding zone / downstream stiffening zone combination has the advantage of optimizing and reducing the traction energy necessary for finishing the opening.
- this combination generates a “downstream” effort peak, the value of which is advantageously less than 80% (or even 70%) of the value of a maximum upstream effort peak generated by the pivoting maneuver of the opening body.
- the opening effort curve has, advantageously and unexpectedly, a general U-shaped or parabola shape.
- This configuration also offers a feeling of control of the opening by the consumer, because the panel does not present a marked / significant folding.
- the longitudinal flexural strength of said folding zone is less than the longitudinal flexural resistance of said downstream stiffening zone; preferably, the longitudinal flexural strength of the downstream stiffening zone is adjusted so that, after tearing of said rupture initiation line, the angle defined by the longitudinal tangents passing through the respective upstream / downstream edges is less or equal to 20 °;
- the downstream stiffening zone has a downstream longitudinal axis, parallel to the long sides; said at least one stiffening molding of said downstream stiffening zone is arranged to impart resistance in longitudinal bending parallel to said downstream longitudinal axis; in this case, the downstream stiffening zone advantageously has a plurality of transverse rectilinear virtual lines, perpendicular to said longitudinal axis downstream, which virtual lines are each cut by at least one stiffening molding;
- downstream stiffening zone forms between 40 and 80%, on the surface, of the removable part
- the transverse virtual axis of the folding zone is cut by at least one stiffening molding.
- said removable part is advantageously divided into four successive zones, taking into account the direction of tearing of the line of initiation of rupture during the operation of the opening member, namely: a folding zone upstream, intended to be deformed by the initial pivoting of said opening member, an upstream stiffening zone, on the side of said opening member, delimited by a small upstream side extended by an upstream portion of the two large sides, said folding zone , interlayer, formed between said upstream stiffening zone and said downstream stiffening zone, and said downstream stiffening zone; said upstream stiffening zone comprises at least one stiffening molding arranged to impart longitudinal flexural strength to said upstream stiffening zone (in the direction of tearing of the line of failure initiation) during the tearing of said line d initiation of rupture.
- the longitudinal flexural strength of said intermediate folding zone is advantageously lower than the longitudinal flexural resistance of the upstream and downstream stiffening zones.
- the upstream stiffening zone advantageously comprises an upstream longitudinal axis, coaxial with said longitudinal axis of the opening member; and the stiffening moldings of the upstream and downstream stiffening zones are arranged to impart resistance in longitudinal bending parallel, respectively, to the upstream and downstream longitudinal axes.
- the upstream stiffening zone has a plurality of transverse rectilinear virtual lines, perpendicular to said upstream longitudinal axis, which virtual lines are each cut by at least one stiffening molding.
- the opening member is advantageously positioned at an angle to the line of initiation of rupture, defined between the small upstream side and a large side.
- the intermediate folding zone and the transverse virtual axis are advantageously skirted by at least one stiffening molding of the upstream stiffening zone and by at least one stiffening molding of the downstream stiffening zone.
- the longitudinal flexural strength of the upstream stiffening zone is advantageously adjusted so that, after tearing of said rupture initiation line, the angle defined by the longitudinal tangents passing through the respective upstream / downstream edges is less than or equal to 20 °.
- the resistances in longitudinal bending of an upstream zone, of the downstream stiffening zone and of the intermediate folding zone are advantageously adjusted so that, after tearing of said line of initiation of rupture, the general angle F1 defined by the upstream longitudinal tangent passing through the upstream border of the upstream zone, on the one hand, and the downstream longitudinal tangent passing through the downstream border of the downstream stiffening zone, on the other hand, is less than or equal at 90 °.
- the present invention also relates to a container of the metal tin can type, comprising a container body equipped with a lid according to the invention.
- FIG. 1 is a general view, in perspective, of a "standard" metal cover, in accordance with the prior art, the removable part of which is illustrated after partial (almost total) tearing of the line of failure initiation;
- FIG. 2 is a top view of an embodiment of a metal cover according to the invention.
- FIG. 3 is a perspective view of the metal cover according to Figure 2;
- FIG. 4 shows the metal cover according to FIG. 3, following a step of deformation of an upstream folding zone, by initial pivoting of its opening member
- FIG. 5 shows the metal cover according to FIG. 3, following a step of maneuver in pivoting of a possible upstream stiffening zone, with a phenomenon of folding of the intermediate folding zone;
- FIG. 6 shows the metal cover according to FIG. 3, following a pivoting operation step of the downstream stiffening zone
- FIG. 7 is a sectional view of the removable part according to FIG. 6, after tearing of its rupture initiation line, according to a section plane VII-VII illustrated in FIG. 2 which passes through the fixing part of the opening member and through the center of the small downstream side;
- FIG. 8 represents two force curves at the opening, respectively, for the standard metal cover according to FIG. 1 (curve A) and for the metal cover according to FIG. 3 (curve B); Legend - abscissa: position of the opening member (ring), comparable to a time or a progression of the opening and Ordered: effort in Newton;
- FIG. 9 represents two folding resistance curves, respectively, for the standard metal cover according to FIG. 1 (curve A) and for the metal cover according to FIG. 3 (curve B), corresponding to its downstream stiffening zone, obtained by folding of moldings of the cover with a linear support and measurement of the forces as a function of the progression of the crosspiece (deformation of the cover);
- Legend - abscissa position of the cross member in linear and ordered support: force in N;
- FIG. 10 shows another embodiment of the metal cover according to the invention.
- FIG. 1 1 shows another embodiment of the metal cover according to the invention
- FIG. 12 shows another embodiment of the metal cover according to the invention.
- FIG. 13 shows another embodiment of the metal cover according to the invention.
- the “standard” metal cover ⁇ shown in FIG. 1, conventionally comprises in itself two main parts:
- peripheral part ⁇ 2 a peripheral part ⁇ 2, forming a peripheral ring, adapted to be secured to the container body.
- the central part ⁇ 1 comprises a removable part ⁇ 3 which is delimited by a line of initiation of rupture and which is equipped with an opening member C5.
- the cover 1 according to the invention is intended to be assembled with the upper edge of a container body T, in particular for a container of the tin can type advantageously metallic (illustrated very schematically and partially in Figure 3).
- This container body T generally consists of a bottom element associated with the lower edge of a side wall belt (with square, rectangular section, etc.).
- connection between the cover 1 and the container body T is carried out, in the usual way, by a crimping technique.
- the cover 1 comprises, conventionally in itself, two main parts:
- This cover 1 is advantageously made in one piece, advantageously in metallic material, even in composite material or in plastic material.
- the central part 2 and the peripheral part 3 can be made from the same material or from two different materials.
- the metal cover 1 is produced by a technique stamping, this from a sheet of metal material such as aluminum, steel, etc.
- cover and “metal cover” are used in an equivalent manner.
- the cover 1 has, seen from above, a generally non-circular shape, in this case rectangular.
- the peripheral part 3 is thus rectangular in shape. It is adapted to allow the fixing of the cover 1 by crimping, on a side wall of container T also with rectangular section (as indicated above, this general shape may be different).
- the central part 2 comprises a removable part 5 which is delimited by a line of initiation of rupture 6 and which is equipped with an opening member 7.
- This central part 2, the removable part 5 and the line of initiation of rupture 6 also have a generally rectangular shape, seen from above (FIG. 2).
- the rupture initiation line 6 has two long sides 61, 62 (longitudinal) connected by two short sides 63, 64 (transverse), namely:
- This rupture line 6 is produced by a thinning of material, obtained by the use of a suitable tool, during the manufacture of the cover 1.
- the rupture line 6 is here closed / complete (it extends around the entire periphery of the removable part 5); alternatively, it could be only partial, along a small upstream side 63 and long sides 61, 62.
- the opening member 7 equips the upper surface of the removable part 5.
- the manipulation of the opening member 7 by the user will allow easy opening of the cover 1 (that is to say a separation, total or partial, of the removable part 5 relative to the peripheral part 2 by rupture of the rupture initiation line 6).
- This opening member 7 is generally known to those skilled in the art under the name of "opening ring”.
- This angle of the breaking line 6 corresponds to an upstream folding zone 51 intended to be deformed by the initial pivoting of the opening member 7.
- the opening member 7 comprises three parts, arranged along an axis of symmetry 7 ′ (FIG. 2) oriented here coaxially with the bisector of the upstream folding zone 51:
- a perforating peripheral part 71, near the rupture line 6, comprising a spout (not shown), a central gripping part 72, forming a gripping loop, which is pressed against the upper surface of the removable part 5, and
- the perforating peripheral part 71 and the central gripping part 72 are provided on either side of the fixing part 73.
- this opening member 7 allows the user to exert traction on the removable part 5, so as to break the line of initiation of rupture 6 from the aforementioned upstream folding zone 51 (adjoining the opening member 7), up to a distal or downstream area situated opposite said opening member 7.
- This distal area here corresponds to the second short side 64 (downstream) of the rupture line 6.
- the opening member 7 progresses at least approximately over the length and opposite a general line of traction 8 defined on the removable part 5, between the upstream folding zone 51 and the middle of the second small side 64.
- This general line of traction 8 (or line of traction 8) is represented in FIG. 2, by a line in broken lines (virtual). It consists here of two generally rectilinear portions:
- a proximal portion 8a situated on the side of the upstream folding zone 51, and oriented coaxially, or at least substantially coaxially, relative to the longitudinal axis 7 ′ of the opening member 7, and
- a distal portion 8b situated on the side of the second short side 64, and oriented parallel and between the two long sides 61, 62 of the rupture line 6.
- junction portion 8c in the general shape of an arc of a circle: the opening member 7 normally passes progressively from the proximal portion 8a to the distal portion 8b.
- the cover 1 according to the invention is structured so that the removable part 5 is divided into successive zones, taking into account the direction of tearing of the rupture initiation line 6 during the operation of the opening member 7 ( along the pull line 8).
- an upstream area 52 advantageously in the form of an upstream “stiffening” area 52, located on the side of the opening member 7 and delimited by the small upstream side 63 (in particular a downstream portion 632 of the latter ) extended by an upstream portion 612, 622 on the two long sides 61, 62 (FIGS. 3 and 5), an intermediate folding zone 53, formed between the upstream zone 52 and a downstream stiffening zone 54, and delimited laterally by an intermediate portion 613, 623 on the two long sides 61, 62 (FIGS. 3 and 5), and
- downstream stiffening zone 54 After tearing of the rupture initiation line 6, the downstream stiffening zone 54, and if necessary the upstream zone 52, are each delimited by upstream edges 521, 541 / downstream 522, 542 ( Figures 3 and 5).
- the upstream area 52 includes:
- downstream edge 522 advantageously passes through a downstream edge 92b of at least one stiffening molding 92 of this upstream stiffening zone 52 (FIG. 3).
- This downstream border 522 can also be defined as a line of change in curvature between the upstream zone 52 and the intermediate folding zone 53, observed after tearing of said line at the start of rupture 6.
- the downstream stiffening zone 54 comprises:
- the upstream edge 541 advantageously passes through an upstream edge 94a of at least one stiffening molding 94 of this downstream stiffening zone 94 (FIG. 3).
- This upstream edge 541 can also be defined as a line of change in curvature between the intermediate folding zone 53 and the downstream stiffening zone 54, observed after tearing of said line at the start of rupture 6.
- downstream edge 542 advantageously passes through a downstream edge 94b of at least one stiffening molding 94 of this downstream stiffening zone 94 (FIG. 3).
- This downstream edge 542 can also be defined as a line of change in curvature in the downstream stiffening zone 54, observed after tearing of said line at the start of rupture 6.
- the upstream area 52 has an upstream longitudinal axis 52 ', coaxial with the longitudinal axis T of the opening member 7.
- the downstream stiffening area 54 has a downstream longitudinal axis 54', parallel to the long sides 61, 62.
- the downstream stiffening zone 54 forms between 40 and 80%, on the surface, of the removable part 5.
- the upstream area 52 advantageously forms between 20 and 60%, on the surface, of the removable part 5.
- the downstream stiffening zone 54 and where appropriate the upstream stiffening zone 52, comprise at least one stiffening molding 9 (designated by the references 94 and 92 respectively) arranged to impart resistance in longitudinal bending to the downstream stiffening zone 54, and if necessary the upstream stiffening zone 52, during the tearing of the breaking initiation line 6 during the pulling on the opening member 7.
- stiffening molding any molding, imprint or tray, formed in hollow (towards the inside of the container) or in a bump (towards the outside of the container), suitable to stiffen the removable part 5 (here an area of this removable part).
- a stiffening molding 9 is delimited by simple molding sections (a single change in height); it can also be defined by sections of double molding, for example forming a single hollow or humped rib.
- longitudinal bending it is advantageously meant a phenomenon of bending, folding, or bending, generated on the removable part 5 along lines transverse to the general line of traction 8 above (such a phenomenon can be observed in FIG. 1) .
- a longitudinal bending results in a curvature of the removable part, along the aforementioned general line of traction 8.
- the phenomenon of longitudinal bending can be quantified by the angle F defined by the upstream / downstream (in / out) longitudinal tangents passing through the upstream / downstream edges of at least one determined area of the removable part 5.
- Longitudinal bending strength advantageously means a bending strength in the direction of tearing of the breaking initiation line 6. That is to say, also a bending resistance along the general line of traction 8 mentioned above .
- the longitudinal flexural strength (also called “folding resistance”) of the downstream stiffening zone 54, and if necessary the upstream zone 52, is advantageously greater than the forces necessary for tearing the line failure initiation 6.
- the longitudinal flexural strength of the downstream stiffening zone 54 is advantageously adjusted so that, after tearing of the breaking initiation line 6, the angle F4 defined by the upstream longitudinal tangents 541 '/ downstream 542 'passing through the respective upstream 541 / downstream 542 edges extends from 0 to 20 ° (less than or equal to 20 °) ( Figure 7).
- the longitudinal flexural strength of the upstream stiffening zone 52 is advantageously adjusted so that, after tearing the line starting point 6, the angle F2 defined by the upstream longitudinal tangents 521 '/ downstream 522' passing through the respective upstream 521 / downstream edges 522 extends from 0 to 20 ° (less than or equal to 20 °) ( figure 7).
- the angle F4 defined by the upstream longitudinal tangents 541 '/ downstream 542' passing through the upstream 541 / downstream edges 542 of the downstream stiffening zone 54 is less than or equal to 20 °.
- the angle F2 defined by the upstream longitudinal tangents 521 ’/ downstream 522’ passing through the upstream 521 / downstream 522 edges of the upstream stiffening zone 52 is advantageously less than or equal to 20 °.
- the angle F2 of the upstream stiffening zone 52 can be greater than the angle F4 of the downstream stiffening zone 54.
- the longitudinal flexural strengths of the upstream area 52, the downstream stiffening area 54 and the intermediate folding area 53 are advantageously adjusted so that, after tearing of the line of failure initiation 6, the general angle F1 defined by the upstream longitudinal tangents 521 '/ downstream 542' (passing respectively through the upstream 521 / downstream 542 edges of the upstream 52 and downstream 54 zones) is less than or equal to 90 °, advantageously less than or equal to 60 ° or from 30 ° to 60 ° (figure 7).
- this general angle F1 (initially of the order of 0 °) is measured on the angular sector situated on the side of the lower / inner face of the removable part 5, intended to come from the inner side of the container and forming a line of the upper surface type.
- the general angle F1 (defined by the upstream longitudinal tangent 521 'passing through the upstream edge 521 of the upstream area 52, on the one hand, and the downstream longitudinal tangent 542' passing through the downstream edge 542 downstream stiffening zone 54, on the other hand) is less than or equal to 90 °.
- said at least one stiffening molding 9 of the downstream stiffening zone 54, and where appropriate of the upstream stiffening zone 52, is arranged to impart longitudinal flexural strength parallel, respectively, to the downstream longitudinal axes 54 'and upstream 52'.
- the downstream stiffening zone 54 and if necessary the upstream stiffening zone 52, have a plurality of transverse rectilinear virtual lines 54 ”, 52”, perpendicular to the longitudinal axes 54 ', 52' mentioned above (only a few 52 ”, 54” transverse rectilinear virtual lines are shown for the sake of simplification in FIG. 2). And these virtual lines 54 ”, 52” are each cut by at least one stiffening molding 9.
- the upstream stiffening zone 52 comprises two moldings stiffening 92, formed on either side of the opening member 7.
- Each molding 92 extends from the upstream edge 521 (connecting with the upstream folding area 51), and here up to the downstream edge 522 (connecting with the intermediate folding area 53).
- This upstream stiffening zone 52 again here includes a reservation 525 formed (at least partially) under the gripping part 72 of the opening member 7.
- This reservation 525 is bordered here by the transverse virtual axis 53 'of the zone folding 53.
- this upstream stiffening zone 52 can also be provided with another arrangement of the stiffening moldings 92.
- this upstream area 52 can also be devoid of stiffening moldings to form:
- the angle F2 defined by the upstream longitudinal tangents 521 '/ downstream 522' passing through the upstream edges 521 / downstream Respective 522 ranges from 0 to 20 °, or
- the upstream area 52 and the intermediate folding area 53 are merged (FIG. 13).
- the upstream area 52 will have a certain curvature (for example greater than 20 °), but the intermediate folding area 53 will always have a greater curvature / folding because the opening process will temporarily block just upstream of the downstream stiffening zone 54 (more rigid).
- the downstream stiffening zone 54 can have different stiffening molding configurations 94.
- the stiffening molding 94 has a general U shape, composed of a curved portion 941 extended by two rectilinear portions 942.
- This stiffening molding 94 is here formed symmetrically with respect to the downstream longitudinal axis 54 ’:
- the curved portion 941 is centered on the downstream longitudinal axis 54 ’, and
- the rectilinear portions 942 are situated on either side of the downstream longitudinal axis 54 ’.
- the apex 94a of the curved portion 941 is situated at the level of the upstream edge 541 of the downstream stiffening zone 54; and the free end 94b of the straight portions 942 is located at the level of the downstream edge 542 of the downstream stiffening zone 54.
- the removable part 5 also has a peripheral rib 95 which runs along the line of initiation of rupture 6 and which is formed in the upstream zone 52, the intermediate folding zone 53 and the downstream stiffening zone 54.
- This peripheral rib 95 can be useful for improving behavior of the removable part 5 during heat treatment of the container and also to improve the rigidity of the removable part 5.
- the stiffening molding 94 of the downstream stiffening zone 54 is composed of:
- the transverse portion 943 runs along the upstream edge 541 of the downstream stiffening zone 54, parallel to the transverse virtual axis 53 ’; and the free end of the straight portions 944 is located at the level of the downstream edge 542 of the downstream stiffening zone 54.
- the stiffening molding 94 is formed by a plate whose contour includes:
- the top of the curved portion 945 is located at the upstream edge 541 of the downstream stiffening zone 54; and the rectilinear portion 947 is located at (and parallel to) the downstream edge 542 of the downstream stiffening zone 54.
- downstream stiffening zone 54 comprises several straight stiffening moldings 948.
- the stiffening moldings 948 extend parallel to the downstream longitudinal axis 54 ’, and they are distributed on either side of this downstream longitudinal axis 54’. These stiffening moldings 948 here consist of two pairs of stiffening moldings 948, each on one side of this downstream longitudinal axis 54 ’.
- Each stiffening molding 948 has two free ends which are located respectively at the upstream 541 and downstream 542 edges of the downstream stiffening zone 54.
- the longitudinal flexural strength of the intermediate folding zone 53 is advantageously lower than the longitudinal flexural resistance provided at the level of the downstream stiffening zone 54, and if necessary the upstream zone 52.
- the intermediate folding zone 53 could also be defined by a variation in the residual thickness of the breaking initiation line 6 at the level of the intermediate portions 613, 623 on the two long sides 61, 62.
- the intermediate folding zone 53 has a transverse virtual axis 53 ′, extending between the intermediate portions 613, 623 on the two long sides 61, 62 (FIG. 5).
- the transverse virtual axis 53 ′ defines a fold line (plastic deformation) generated on the removable part 5 during the tearing of the intermediate portions 613, 623 and before tearing of the downstream stiffening zone 54.
- This transverse virtual axis 53 ′ here forms an angle, other than 90 °, relative to the downstream longitudinal axis 54 ’.
- this virtual axis is parallel, or at least approximately parallel, to a bisector defined between the longitudinal axes 52 ’, 54’.
- this transverse virtual axis 53 ’ can be at 90 ° with respect to these same longitudinal axes 52’, 54 ’.
- this intermediate folding zone 53 and the transverse virtual axis 53 ′ are advantageously bordered (bordered) by at least one stiffening molding 94 of the downstream stiffening zone 54, and if necessary by at least one stiffening molding 92 of the upstream stiffening zone 52.
- the transverse virtual axis 53 ′ of the intermediate folding zone 53 can also be cut by at least one stiffening molding 9 (FIG. 10).
- the particular structure of the cover 1 gives here a particular opening kinematics which is illustrated in FIGS. 3 to 6.
- the consumer notes at least three successive stages.
- a step of deformation of the upstream folding zone 51 is carried out by the initial pivoting of said opening member 7 (FIG. 4).
- This movement generates a folding of the removable part 5, along the upstream edge 521 of the upstream area 52.
- This maneuvering of the upstream area 52 is accompanied / terminated by a phenomenon of folding of the intermediate folding area 53, around the transverse virtual axis 53 ′ (FIG. 5).
- the general angle F1 mentioned above advantageously passes from a value of the order of 0 ° to a value less than or equal to 90 ° (FIG. 7).
- angle F4 of the downstream stiffening zone 54 (and possibly the angle F2 of the upstream stiffening zone 52) advantageously pass, respectively and independently, from a value of the order of 0 ° to a value less than or equal to 20 ° (FIG. 7).
- This force curve at opening B is advantageously characteristic of the invention with a downstream portion (corresponding to the tearing of the downstream stiffening zone 54) in a U or in a parabola.
- this opening force curve B is generally in the form of a double U or double parabolas (or W), with two successive force peaks.
- the points B1_, B2 and B3 of the curve B correspond, respectively, to the states illustrated in FIGS. 4, 5 and 6, namely respectively initiation of the tearing of the upstream stiffening zone 52, initiation of the tearing of the downstream stiffening zone 54 and close to the end of the tearing of the downstream stiffening zone 54.
- the cover 1 according to the invention has a downstream force peak B2 (curve B), relative to the force curve at the "standard” opening (curve A), corresponding to the priming / initiating the pivoting maneuvering step of the downstream stiffening zone 54.
- the cover 1 is structured so that the value of this downstream force peak B2 is less than 80% (or even 70%) of the value of the maximum upstream force peak B1.
- the structure of the cover 1 according to the invention allows a reduction in the energy required for the step of maneuvering the removable part 5 (from B1 to B3), and by particular of the operation of the downstream stiffening zone 54 (between points B2 and B3), this despite this peak of downstream force B2.
- the efficiency of the traction energy (in terms of tearing the rupture line 6) is in particular improved compared to the standard metal cover.
- the folding resistance curve of the downstream stiffening zone 54 is illustrated by curve B in FIG. 9, in comparison with the “standard” folding resistance curve of a cover according to FIG. 1 (curve A ).
- the resistance to folding of the downstream stiffening zone 54 is greater than the resistance to folding of the standard cover (maximum force - in N).
- the downstream stiffening zone 54 is advantageously stiffer than the standard cover (the steeper the angle of the initial slope of the curve, the steeper the cover).
- FIGS. 8 and 9 are advantageously obtained in the case of an easy-opening cover in Club format, advantageously whose proportions are of the order of 100 x 55 mm.
- the invention applies to other rectangular formats, with possibly some variations in particular in the opening force curve or the bending resistance curve of the downstream stiffening zone 54.
- the folding zone / downstream stiffening zone combination has the advantage of optimizing and reducing the traction energy necessary for opening, while optimizing the quality perceived for the consumer.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Closures For Containers (AREA)
- Packages (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1871949A FR3088913B1 (fr) | 2018-11-27 | 2018-11-27 | Couvercle pour un corps de contenant, en particulier pour un contenant du genre boîte de conserve |
PCT/EP2019/082530 WO2020109284A1 (fr) | 2018-11-27 | 2019-11-26 | Couvercle pour un corps de contenant, en particulier pour un contenant du genre boîte de conserve |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3887272A1 true EP3887272A1 (fr) | 2021-10-06 |
Family
ID=65951748
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19806267.1A Pending EP3887272A1 (fr) | 2018-11-27 | 2019-11-26 | Couvercle pour un corps de contenant, en particulier pour un contenant du genre boîte de conserve |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3887272A1 (fr) |
FR (1) | FR3088913B1 (fr) |
MA (1) | MA54277A (fr) |
WO (1) | WO2020109284A1 (fr) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3591037A (en) * | 1969-02-24 | 1971-07-06 | Aluminum Co Of America | Container with removable panel portion |
FR2074598A1 (fr) * | 1970-01-08 | 1971-10-08 | Cebal Gp | |
DE3535226A1 (de) * | 1985-10-02 | 1987-04-16 | Schmalbach Lubeca | Deckel aus blech fuer unrunde dosen, insb. langovale dosen im hansa-format |
FR2945794A1 (fr) * | 2009-05-20 | 2010-11-26 | Impress Group Bv | Couvercle metallique pour un corps de contenant avec moulure(s)de rigidification |
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2018
- 2018-11-27 FR FR1871949A patent/FR3088913B1/fr active Active
-
2019
- 2019-11-26 EP EP19806267.1A patent/EP3887272A1/fr active Pending
- 2019-11-26 WO PCT/EP2019/082530 patent/WO2020109284A1/fr unknown
- 2019-11-26 MA MA054277A patent/MA54277A/fr unknown
Also Published As
Publication number | Publication date |
---|---|
WO2020109284A1 (fr) | 2020-06-04 |
FR3088913B1 (fr) | 2021-07-02 |
FR3088913A1 (fr) | 2020-05-29 |
MA54277A (fr) | 2022-03-02 |
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