EP2507146B1 - Packaging foil with tear initiation - Google Patents

Packaging foil with tear initiation Download PDF

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Publication number
EP2507146B1
EP2507146B1 EP10805796.9A EP10805796A EP2507146B1 EP 2507146 B1 EP2507146 B1 EP 2507146B1 EP 10805796 A EP10805796 A EP 10805796A EP 2507146 B1 EP2507146 B1 EP 2507146B1
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EP
European Patent Office
Prior art keywords
tear
contour
thin film
area
film according
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.)
Not-in-force
Application number
EP10805796.9A
Other languages
German (de)
French (fr)
Other versions
EP2507146A1 (en
Inventor
Enrique Cerda Villablanca
Eugenio Hamm Hahn
Victor Romero Gramegna
Benoît ROMAN
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Universidad de Chile
Universidad de Santiago de Chile
Centre National de la Recherche Scientifique CNRS
Original Assignee
Universidad de Chile
Universidad de Santiago de Chile
Centre National de la Recherche Scientifique CNRS
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Publication of EP2507146A1 publication Critical patent/EP2507146A1/en
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Publication of EP2507146B1 publication Critical patent/EP2507146B1/en
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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
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/52—Details
    • B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
    • B65D75/5827—Tear-lines provided in a wall portion
    • B65D75/5833—Tear-lines provided in a wall portion for tearing out a portion of the wall
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/15—Sheet, web, or layer weakened to permit separation through thickness

Definitions

  • the invention relates to the opening of thin packages, typically made of plastic.
  • a tear primer typically in the form of a pre-cut tongue. But it appeared that, when tearing a fragile film by pulling on such a pre-cut tongue, the sides thereof tend to converge towards one another during the tear, which results in a detachment of a simple tapered flap, so that one must look for a new tear initiation, which results in the tearing of a new flap, and so on.
  • the document LU91 221 A2 shows a pocket with a rupture primer opening in an area capable of trapping the tear.
  • the invention aims to meet this objective and proposes for this purpose a thin packaging film comprising the characteristics defined in claim 1.
  • the spiral thus traversed by tearing of the film in its fragile part is of exponential shape and continues to the edges of the face formed by the packaging film (and no longer a line as in the known solutions); yet the force to be applied for the propagation of the tear remains substantially constant while being moderate.
  • the gripping portion has the shape of a tongue, which facilitates the lifting and then the grip on this gripping portion; alternatively, this gripping portion may be provided with an attached pull.
  • the closed contour of the reference zone is lined internally by a material having a lower tear resistance than that of the tearable zone surrounding this closed contour.
  • this reference zone is an opening whose edge constitutes the closed contour; this closed contour is advantageously rounded, even circular, which allows a regular behavior of the film during tearing.
  • the closed contour of the reference zone is internally lined by a reinforcing material having a higher tear strength than that of the tear-off zone.
  • the closed contour of the reference zone is lined internally by a loop of said reinforcing material which is traversed by the tear initiation; for example, the reference zone comprises an opening lined externally by said loop; alternatively, the reference zone comprises a median zone surrounded by said loop, this median zone preferably having the same resistance to tearing as the tear-off zone surrounding the closed contour (that is to say that the loop may be a loop referred to the film packaging, thus separating the inner and outer areas of the same film).
  • the reference zone is formed entirely of this reinforcing material.
  • tear initiation crosses the contour into the reference zone, when this is materialized.
  • This reinforcing material is advantageously chosen as being plastic (thus little tearable).
  • the tear primer has an outer end (intended to propagate outside the contour ) which is located so that the tangent at this point to said tear initiation is substantially perpendicular to a tangent to the closed contour passing through that point.
  • the outline need not represent a significant fraction of the packaging film surface to be removed; thus, the inner surface of the contour may be less than 10%, or even less than 5% (or even 1%) of the packaging surface of said film.
  • the tear initiation has a length of between 0.5 cm and 3 cm. cm and / or the closed contour has a mean transverse dimension of between 1 and 3 centimeters.
  • the rounded closed contour has a generally circular shape, which ensures a regular behavior of the film during tearing.
  • FIGS. 1 to 3 together represent a first example of a thin packaging film according to the invention, with a first form of tear initiation.
  • This thin film of which a portion is represented under the reference 1, has an opening 2 whose closed contour is rounded.
  • this opening has a circular contour, but it can alternatively not shown, be oval, or have three (or more) rounded vertices.
  • this contour is as close as possible to a circular shape, i.e. it has a radius of curvature as constant as possible (at at most, at a point marked A 0 - see below).
  • This thin film is of any known type suitable, both from the point of view of material constituting the point of view of thickness; for example, it is a polypropylene thin film for example bioriented (especially BOPP type) having a thickness of a few hundredths of a millimeter, optionally metallized.
  • the thin film 1 comprises, starting from a point A 0 of the contour, a breaking primer 3 constituted by a cut of limited length, denoted by A 0 B 0 , starting from the contour in any orientation.
  • this cutout 3 The function of this cutout 3 is to delimit, together with the contour of the opening 2, a gripping portion 4 adapted to be gripped between the fingers of a user.
  • the tear initiation 3 is substantially tangent to the contour of the opening, at A 0 , so that the gripping portion constitutes a tongue, even before the transverse traction is begun to be applied to it. on the plane of the film.
  • This gripping portion is delimited on one side by the tear primer 3 (which will be able to propagate) and on the other side by the contour 2 (which will, at first, trap the displacement of the end internal of the primer - see below).
  • the figure 2 represents the packaging film in a starting configuration in which the tab, initially located in the plane of the film 1, has been raised, by the fingers of a user, in a direction substantially perpendicular to this plane.
  • This straightening of the tongue spontaneously results in the formation of a fold 5 (that is to say a very weak zone).
  • radius of curvature extending substantially from the outer end of the tear initiation A 0 B 0 , that is, from the point Bo, to the contour 2 being tangent thereto (the point of tangency in this starting configuration is noted C 0 ).
  • This configuration taken spontaneously by the tongue, has the advantage that, if the tongue is pulled so as to move it away from the plane of the film, a tear 3A occurs in the extension of the initial tearing primer A 0 B 0 while the zone 5 of small radius of curvature (which is here a fold) moves in the film, extending from the new end B of the tear line to the contour while tending to be tangent to this one at a point C (B and C designate the current positions of the ends of the fold).
  • the direction of traction is as perpendicular as possible to the plane of the film, but practice has shown that this is not critical (for example, a difference of about ten degrees is quite acceptable (a traction by the fingers of an operator is usually not exactly perpendicular to the plane of the film)).
  • the continuation of the pulling of the tongue actually results in the propagation of the tear 3 in a spiral curve until reaching an edge of the film.
  • the packaging film can then be removed in one piece.
  • the contour of the opening 2 is rounded, at least outside the point A 0 . Indeed, an angular point of this contour, the tip of which would be oriented towards the outside of the opening, would be likely to constitute, because of the stresses applied to the tongue, a rupture primer which would reveal a second line of tearing , inadvertent, which could converge, until intercepted, to line 3.
  • the tear primer 3 it is also advantageous if there is no angular point in the tearing primer 3 having its point directed outwardly since, after passing through the point A 0 , the fold 5 tends to stay tangent to the new edge constituted by the tear initiation 3 and then the tear 3A.
  • the simplest is to give the tear primer a shape devoid of any sharp point.
  • the tear line 3A propagates beyond B 0 in the extension of the tear primer 3, so that when the fold 5 reaches the point B 0 , after the propagation of the tear on a turn being tangent to the edge constituted by the tear primer 3A, it crosses while remaining tangent to the tear 3A which started from B 0 .
  • the tear initiation 3 is cut in such a way that the angle formed at B 0 by the tangent to this tear initiation and the tangent to the opening 2 passing through this point B 0 (that is B 0 C 0 ) is greater than or equal to 90 °.
  • the angle formed by the tear initiation with contour 2 is arbitrary.
  • this primer 3 is conformed to a tangent to the contour 2 (if it is rounded, preferably circular), the tongue thus formed is narrow, so that it is advantageous if this tongue has a sufficient length. to minimize the risk that, at the beginning of the propagation of the tear from the point B 0 , this tear converges to the contour 2 in the case of a lack of control of the orientation of the traction applied to this tab.
  • the tear initiation it may therefore seem preferable to conform the tear initiation so that it has a non-zero angle with the tangent local contour, that is to say, it is not tangent to this contour; on the other hand, if this angle increases, the width of the tongue increases, but it is preferable (see above) to bend this tear initiation so as to turn its concavity towards the inside of the opening.
  • the Figures 4 to 6 thus represent a variant of Figures 1 to 3 ; elements similar to those of these figures are designated by reference signs which are deduced from those of Figures 1 to 3 by adding the premium index.
  • the film 1 ' is distinguished by the fact that the tear initiation 3' extends from the edge of the point A 0 ', on the contour of the opening 2', at an angle substantially equal to 90 ° i.e., the primer 3 'is, near this point A 0 ', substantially perpendicular to the local tangent.
  • this primer 3 ' is curved, with a curvature such that, at the point B 0 ', its tangent is substantially perpendicular to the direction of the fold 5 '(between the points B 0 ' and C 0 ') which is formed as soon as traction is applied to the tongue perpendicular to the plane of the film.
  • this traction results in a propagation of the tear, beyond B 0 ', in the extension of this primer, so that it does not appear angular point at this point B 0 '. After one turn of this fold, it passes without difficulty this point B 0 '.
  • this section A 0 B 0 (or A 0 'B 0 ') is in practice chosen so as to allow easy grasping, by the fingers of a user, of the tongue delimited by this cut and the outline of the 'opening ; a length of the order of 0.5 cm to 1 cm (or even 1.5 cm or even 3 cm) is a range that seems quite appropriate for openings 2 or 2 'having a mean transverse dimension (it is a diameter if these openings are actually circular) of a few centimeters (typically between 1 and 3 cm).
  • the dimensions of the spiral then obtained by traction on this tongue are large enough to ensure a reasonably rapid release (in a reasonable number of turns) of the film vis-à-vis the product it is used to pack. Of course, larger dimensions are possible.
  • the opening 2 (or 2 ') is likely to locally constitute a defect in the protection of the product provided by the packaging film; indeed, dust, in particular, can penetrate to the product through the film via this opening.
  • this disadvantage can easily be eliminated by providing, under the film, or above it, protection located in the area comprising this opening.
  • the ease of gripping can be improved by engaging an additional strip of any suitable material forming a pull tab.
  • FIGS. 7 to 9 represent another embodiment of a packaging thin film according to the invention, which does not have the disadvantage of such a potential protection fault.
  • these figures represent a thin packaging film 11 comprising a reference zone 12 whose closed contour 12A is rounded and in which a tongue 14 is pre-cut.
  • An edge of this tongue is a tear initiation 13 constituted by a cut of limited length, denoted E 0 F 0 ; this tongue forms, when pulled away from the plane of the thin packaging film, a fold 15.
  • the thin film 11 is different from that of the Figures 1 to 3 in that, instead of interrupting along the contour of the opening 2, it extends into the zone 12, the latter being bordered by a loop of reinforcing material 16, which runs along the contour 12A inwardly.
  • the tear initiation 13 extends from the internal contour of the loop 16 (from the point marked E 0 ), through this loop to the point G 0 located on the contour 12A, and outside of this one up to the point F 0 .
  • a second tear initiation 17 is advantageously provided along the inner contour of the loop 16 from the point E 0 , to a point noted H 0 .
  • the tongue 14 can thus be straightened with respect to the plane of the thin film without any effort.
  • this tear primer 17 may be omitted, the passage of a nail (or any other tool) through the precut E 0 F 0 being sufficient to cause a tear beginning along the inner contour of the loop 16.
  • the internal contour of the loop 16 behaves, when pulling on the tongue, as the edge of the opening 2.
  • the tear 17 has been precut or it appeared during the passage of a nail through the primer E 0 F 0 tear, this tear 17 can only propagate along the inner edge of the loop 16, since it can not cross this loop (since it is made of reinforcement, it is easier for the tear 17 to propagate in the film, inside the loop 16, than to cross this loop).
  • the inner end of the tongue is, at least at the beginning of the propagation of the tear, trapped inside the contour 12A, along the inner contour of the loop 16.
  • the invention is not limited to any angle value between the tear initiation and the outer contour of the reinforced zone.
  • This loop 16 is for example made of an extra thickness consisting of the same material as the thin film. It may also be polyethylene, polypropylene (possibly bioriented), or even metal, in particular.
  • This loop is advantageously attached to the thin film under it, so as not to risk clinging before the time when the film must be removed. It has been found that this arrangement does not affect the strength of the connection between this loop and the thin film, during the application of traction on the tongue.
  • This loop is advantageously annular in which case its average transverse dimension is a diameter; this average transverse dimension is advantageously of the order of one centimeter, for example included between 1 cm and 3 cm, as before. It is understood that, given this small size, it is much easier to set up such a loop that to set up a strip along a desired tear line, as in known solutions.
  • the width of the loop (that is to say the width of the reinforcing strip constituting this loop) is advantageously of the order of a few millimeters, for example between 1 and 5 mm (this may depend on the constituent material; the stronger the material is, the less important the width needs to be).
  • the dimensions can be much larger; it is up to the person skilled in the art to choose appropriate dimensions according to the intended application (in particular the dimensions of the packaged product).
  • FIGS. 10 to 12 represent a variant of Figures 7 to 9 . Elements similar to those of these figures are designated by reference signs which are deduced from those of Figures 7 to 9 by the addition of the "premium" index.
  • the reinforcing material is not limited to a loop within the contour 12A, but extends over the entire zone 12; in other words this reinforcing material is in the form of a disk, with a circular contour or not (it can be a massive zone of any contour).
  • this reinforcing material is sufficiently undrillable, the fact of applying traction to the gripping portion defined by the primer causes propagation of the only end that can be propagated, namely the external end located at the end.
  • this trapping effect ceases as soon as, as in the case of Figures 7 to 12 this reinforcing zone begins to bend, in which case the tear continues, while the fold of the tongue rotates while remaining tangent to the tear 13A, continuing the spiral that has begun to form.
  • the thin film has a greater resistance than the vacuum located inside the contour 2 (the edge of the opening constituted by this vacuum confines the propagation of the inner end of the tear primer) while in a second example the outline is internally lined by a reinforcing material which also confines the inner end of the tear primer.
  • the contour is lined internally by a reinforcing material, which has the shape of a loop, the residual part, inside this loop can be an opening without material.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wrappers (AREA)
  • Packages (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Description

L'invention concerne l'ouverture d'emballages minces, typiquement en matière plastique.The invention relates to the opening of thin packages, typically made of plastic.

De manière classique, divers produits de consommation (paquets de biscuits, de cigarettes, de CD, de DVD, etc.) sont recouverts d'un emballage formé d'un film (ou feuille) mince fragile, c'est-à-dire capable d'être déchiré. Un tel emballage permet une protection efficace du produit pendant la période de temps séparant la fin de la fabrication de ce produit et sa mise en service ; cela signifie que, avant de mettre le produit en service, il faut enlever cet emballage. Lorsqu'un tel enlèvement est réalisé à la main, c'est-à-dire sans outil, il se produit en pratique par déchirures aléatoires jusqu'à pouvoir dégager les portions d'emballage ainsi séparées.Conventionally, various consumer products (packages of cookies, cigarettes, CDs, DVDs, etc.) are covered with a package formed of a thin film (or sheet) fragile, that is to say able to be torn. Such packaging provides effective protection of the product during the period of time between the end of manufacture of this product and its commissioning; this means that before putting the product into service, it must be removed. When such removal is carried out by hand, that is to say without tools, it occurs in practice by random tears until clearing the packaging portions thus separated.

Il est bien connu que de telles déchirures aléatoires ne permettent pas un enlèvement fiable et rapide de l'emballage. En effet, il est rare d'arriver avec les doigts à provoquer une déchirure qui se propage correctement au point de séparer deux parties d'emballage aisées à enlever ; au contraire, il est souvent nécessaire de procéder à plusieurs déchirures dont chacune tend à s'interrompre rapidement ; le nombre de déchirures successives qu'il faut provoquer est particulièrement important lorsqu'il faut entamer soi-même une déchirure à partir d'un bord du film d'emballage.It is well known that such random tears do not allow a reliable and rapid removal of the package. Indeed, it is rare to arrive with the fingers to cause a tear that spreads properly to the point of separating two easy to remove packaging parts; on the contrary, it is often necessary to make several tears, each of which tends to be interrupted rapidly; the number of successive tears to be caused is particularly important when you have to tear yourself from an edge of the packaging film.

Pour remédier à cette situation, il a déjà été proposé de former dans le film d'emballage une amorce de déchirure, typiquement sous la forme d'une languette prédécoupée. Mais il est apparu que, lorsqu'on déchire un film fragile en tirant sur une telle languette prédécoupée, les côtés de celle-ci tendent à converger l'un vers l'autre au cours de la déchirure, ce qui se traduit par un détachement d'un simple lambeau effilé, de sorte qu'il faut rechercher une nouvelle amorce de déchirure, ce qui se traduit par l'arrachage d'un nouveau lambeau, et ainsi de suite.To remedy this situation, it has already been proposed to form in the packaging film a tear primer, typically in the form of a pre-cut tongue. But it appeared that, when tearing a fragile film by pulling on such a pre-cut tongue, the sides thereof tend to converge towards one another during the tear, which results in a detachment of a simple tapered flap, so that one must look for a new tear initiation, which results in the tearing of a new flap, and so on.

Il a également été proposé d'associer à une languette prédécoupée une bande d'un matériau sous-jacent destinée à guider la déchirure d'une manière appropriée ; toutefois, à moins de solidariser cette bande au film d'emballage sur toute sa longueur (ce qui se révèle complexe en pratique et risque de fragiliser l'emballage tant qu'il sert de protection), il n'est pas rare que cette bande ne permette pas un guidage jusqu'au bout de la ligne de déchirure prévue. Et, à supposer que cette bande permette un guidage de la déchirure tout au long de cette bande, il peut y avoir ensuite des difficultés à dégager le produit hors du réceptacle formé par le reste de l'emballage, compte tenu des frottements entre ce produit et la paroi interne de cet emballage (il peut être nécessaire de générer une ligne supplémentaire de déchirure, avec les difficultés précitées).It has also been proposed to associate with a pre-cut tongue a strip of an underlying material intended to guide the tear in an appropriate manner; However, unless this band is secured to the wrapping film over its entire length (which is complex in practice and may weaken the packaging as it serves as protection), it is not uncommon for this band does not allow guiding to the end of the planned tear line. And, assuming that this band allows a guide tear throughout this strip, it may then be difficult to release the product out of the receptacle formed by the rest of the package, given the friction between this product and the inner wall of this package (it may be necessary to generate an additional line of tear, with the aforementioned difficulties).

Il n'existe donc pas, à ce jour, de film d'emballage permettant, sans préparation complexe de celui-ci, d'assurer une ouverture facile de ce film en sorte d'en permettre un enlèvement en un très petit nombre de morceaux.So far there is no packaging film allowing, without complex preparation thereof, to ensure easy opening of this film so as to allow removal in a very small number of pieces .

Le document LU91 221 A2 montre une poche avec une amorce de rupture débouchant dans une zone apte à piéger la déchirure.The document LU91 221 A2 shows a pocket with a rupture primer opening in an area capable of trapping the tear.

L'invention vise à répondre à cet objectif et propose à cet effet un film mince d'emballage comportant les caractéristiques définies à la revendication 1.The invention aims to meet this objective and proposes for this purpose a thin packaging film comprising the characteristics defined in claim 1.

Il apparaît en effet que, par application à la portion de préhension d'une traction à l'écart du film mince, en pratique perpendiculaire à celui-ci, on provoque une propagation en spirale divergente de la déchirure, à partir de l'extrémité externe de l'amorce de déchirure, alors que, du fait de son piégeage dans la zone de référence, l'extrémité interne de la portion de préhension ne risque pas de converger vers cette déchirure en spirale ; cette fonction de piégeage de l'extrémité interne par la zone de référence n'est utile que pendant environ un demi-tour de la spirale car il apparaît qu'ensuite, l'extrémité (voire le bord) interne de la portion de film en train de s'écarter du plan du film d'emballage tend à rester à l'intérieur du début de ladite spirale (voir ci-dessous). En pratique, la spirale ainsi parcourue par la déchirure du film dans sa partie fragile est de forme exponentielle et se poursuit jusqu'aux bords de la face formée par le film d'emballage (et non plus une ligne comme dans les solutions connues) ; pourtant la force à appliquer pour la propagation de la déchirure reste sensiblement constante tout en étant modérée.It appears in fact that, by applying to the gripping portion a traction away from the thin film, in practice perpendicular to it, a divergent spiral propagation of the tear is caused from the end external of the tear initiation, whereas, due to its trapping in the reference zone, the inner end of the gripping portion is not likely to converge towards this spiral tear; this function of trapping the inner end by the reference area is only useful for about half a turn of the spiral because it appears that then the inner end (or the edge) of the film portion in the process of s to move away from the plane of the wrapping film tends to remain inside the beginning of said spiral (see below). In practice, the spiral thus traversed by tearing of the film in its fragile part is of exponential shape and continues to the edges of the face formed by the packaging film (and no longer a line as in the known solutions); yet the force to be applied for the propagation of the tear remains substantially constant while being moderate.

De manière avantageuse, la portion de préhension a la forme d'une languette, ce qui facilite le soulèvement puis la prise sur cette portion de préhension ; en variante, cette portion de préhension peut être munie d'une tirette rapportée.Advantageously, the gripping portion has the shape of a tongue, which facilitates the lifting and then the grip on this gripping portion; alternatively, this gripping portion may be provided with an attached pull.

Selon une première forme de réalisation de l'invention, le contour fermé de la zone de référence est longé intérieurement par un matériau ayant une résistance au déchirement plus faible que celle de la zone déchirable entourant ce contour fermé. De manière préférée, cette zone de référence est une ouverture dont le bord constitue le contour fermé ; ce contour fermé est avantageusement arrondi, voire circulaire, ce qui permet un comportement régulier du film lors de la déchirure.According to a first embodiment of the invention, the closed contour of the reference zone is lined internally by a material having a lower tear resistance than that of the tearable zone surrounding this closed contour. In a preferred manner, this reference zone is an opening whose edge constitutes the closed contour; this closed contour is advantageously rounded, even circular, which allows a regular behavior of the film during tearing.

Selon une seconde forme de réalisation de l'invention, le contour fermé de la zone de référence est longé intérieurement par un matériau de renforcement ayant une résistance au déchirement plus élevée que celle de la zone déchirable. Selon une première option, le contour fermé de la zone de référence est longé intérieurement par une boucle dudit matériau de renforcement qui est traversée par l'amorce de déchirure ; à titre d'exemple, la zone de référence comporte une ouverture bordée extérieurement par ladite boucle ; en variante, la zone de référence comporte une zone médiane entourée par ladite boucle, cette zone médiane ayant de préférence une même résistance au déchirement que la zone déchirable entourant le contour fermé (cela revient à dire que la boucle peut être une boucle rapportée au film d'emballage, en séparant ainsi des zones interne et externe du même film). Selon une autre option, la zone de référence est formée en totalité de ce matériau de renforcement.According to a second embodiment of the invention, the closed contour of the reference zone is internally lined by a reinforcing material having a higher tear strength than that of the tear-off zone. According to a first option, the closed contour of the reference zone is lined internally by a loop of said reinforcing material which is traversed by the tear initiation; for example, the reference zone comprises an opening lined externally by said loop; alternatively, the reference zone comprises a median zone surrounded by said loop, this median zone preferably having the same resistance to tearing as the tear-off zone surrounding the closed contour (that is to say that the loop may be a loop referred to the film packaging, thus separating the inner and outer areas of the same film). According to another option, the reference zone is formed entirely of this reinforcing material.

On peut noter que l'amorce de déchirure traverse le contour jusque dans la zone de référence, lorsque celle-ci est matérialisée.It can be noted that the tear initiation crosses the contour into the reference zone, when this is materialized.

Ce matériau de renforcement est avantageusement choisi comme étant plastique (donc peu déchirable).This reinforcing material is advantageously chosen as being plastic (thus little tearable).

De manière avantageuse, pour minimiser les risques d'apparition de déchirure intempestive au moment où la ligne de déchirure se propage après un premier tour de spirale, l'amorce de déchirure a une extrémité externe (destinée à se propager à l'extérieur du contour) qui est située en sorte que la tangente en ce point à ladite amorce de déchirure est sensiblement perpendiculaire à une tangente au contour fermé passant par ce point.Advantageously, to minimize the risk of occurrence of inadvertent tearing at the time when the tear line propagates after a first spiral turn, the tear primer has an outer end (intended to propagate outside the contour ) which is located so that the tangent at this point to said tear initiation is substantially perpendicular to a tangent to the closed contour passing through that point.

Il mérite d'être noté que le contour n'a pas besoin de représenter une fraction importante de la surface de film d'emballage à enlever ; ainsi, la surface interne du contour peut être inférieure à 10%, voire inférieure à 5% (ou même 1 %) de la surface d'emballage dudit film.It should be noted that the outline need not represent a significant fraction of the packaging film surface to be removed; thus, the inner surface of the contour may be less than 10%, or even less than 5% (or even 1%) of the packaging surface of said film.

A titre d'exemple dimensionnel, notamment efficace pour l'enlèvement de films d'emballage pour des produits tels que des boitiers de cassette Hi-Fi ou de CD ou DVD, l'amorce de déchirure a une longueur comprise entre 0.5 cm et 3 cm et/ou le contour fermé a une dimension transversale moyenne comprise entre 1 et 3 centimètres.As a dimensional example, particularly effective for the removal of packaging films for products such as Hi-Fi cassette cases or CD or DVD, the tear initiation has a length of between 0.5 cm and 3 cm. cm and / or the closed contour has a mean transverse dimension of between 1 and 3 centimeters.

De manière préférée, le contour fermé arrondi a une forme globalement circulaire, ce qui garantit un comportement régulier du film lors de la déchirure.Preferably, the rounded closed contour has a generally circular shape, which ensures a regular behavior of the film during tearing.

Il est apparu que la géométrie et l'orientation de l'amorce de déchirure, notamment son inclinaison par rapport au contour, n'ont pas une importance significative sur le bon détachement du film par déchirure en spirale.It has been found that the geometry and orientation of the tear primer, in particular its inclination with respect to the contour, do not have a significant importance on the good detachment of the film by spiral tearing.

Des objets, caractéristiques et avantages de l'invention ressortent de la description qui suit, donnée à titre d'exemple illustratif non limitatif, donnée en regard des dessins annexés sur lesquels :

  • la figure 1 est une vue en perspective d'un détail d'un film d'emballage conforme à l'invention, en cours de déchirement,
  • la figure 2 est une vue de dessus de ce détail, en une phase initiale de déchirement, antérieure à celle de la figure 1,
  • la figure 3 en est une vue de dessus en une phase de déchirement postérieure à celle de la figure 1,
  • la figure 4 est une vue en perspective d'un détail d'un film d'emballage identique à celui des figures 1 à 3, mais comportant une autre forme d'amorce de déchirure,
  • la figure 5 en est une vue de dessus en une phase initiale de déchirement, antérieure à celle de la figure 4,
  • la figure 6 en est une vue de dessus en une phase de déchirement postérieure à celle de la figure 4,
  • la figure 7 est une vue en perspective d'un détail d'un autre film d'emballage conforme à l'invention, en cours de déchirement,
  • la figure 8 est une vue de dessus de ce détail en une phase initiale de déchirement, antérieure à celle de la figure 7,
  • la figure 9 en est une vue de dessus en une phase de déchirement postérieure à celle de la figure 7,
  • la figure 10 est une vue en perspective d'un détail d'un film d'emballage identique à celui des figures 7 à 9, mais présentant une autre géométrie d'amorce de déchirure,
  • la figure 11 en est une vue de dessus en une phase initiale de déchirement, antérieure à celle de la figure 10, et
  • la figure 12 en est une vue de dessus en une phase de déchirement postérieure à celle de la figure 10.
Objects, characteristics and advantages of the invention will become apparent from the description which follows, given by way of nonlimiting illustrative example, given with reference to the appended drawings in which:
  • the figure 1 is a perspective view of a detail of a packaging film according to the invention, during tearing,
  • the figure 2 is a top view of this detail, in an initial phase of tearing, prior to that of the figure 1 ,
  • the figure 3 is a view from above in a tearing phase posterior to that of the figure 1 ,
  • the figure 4 is a perspective view of a detail of a packaging film identical to that of Figures 1 to 3 but having another form of tear initiation,
  • the figure 5 is a view from above in an initial phase of tearing, prior to that of the figure 4 ,
  • the figure 6 is a view from above in a tearing phase posterior to that of the figure 4 ,
  • the figure 7 is a perspective view of a detail of another packaging film according to the invention, during tearing,
  • the figure 8 is a top view of this detail in an initial phase of tearing, prior to that of the figure 7 ,
  • the figure 9 is a view from above in a tearing phase posterior to that of the figure 7 ,
  • the figure 10 is a perspective view of a detail of a packaging film identical to that of Figures 7 to 9 but having another tear initiation geometry,
  • the figure 11 is a view from above in an initial phase of tearing, prior to that of the figure 10 , and
  • the figure 12 is a view from above in a tearing phase posterior to that of the figure 10 .

Les figures 1 à 3 représentent conjointement un premier exemple de film mince d'emballage conforme à l'invention, avec une première forme d'amorce de déchirure.The Figures 1 to 3 together represent a first example of a thin packaging film according to the invention, with a first form of tear initiation.

Ce film mince, dont une portion est représentée sous la référence 1, comporte une ouverture 2 dont le contour fermé est arrondi. Dans l'exemple représenté, cette ouverture a un contour circulaire, mais il peut, en variante non représentée, être ovale, ou comporter trois (voire plus) sommets arrondis. Toutefois, ainsi que cela sera aisément compris ci-dessous, il est préférable que ce contour soit aussi proche que possible d'une forme circulaire, c'est-à-dire qu'il ait un rayon de courbure aussi constant que possible (à part, au plus, en un point noté A0 - voir ci-dessous).This thin film, of which a portion is represented under the reference 1, has an opening 2 whose closed contour is rounded. In the example shown, this opening has a circular contour, but it can alternatively not shown, be oval, or have three (or more) rounded vertices. However, as will be readily understood below, it is preferable that this contour is as close as possible to a circular shape, i.e. it has a radius of curvature as constant as possible (at at most, at a point marked A 0 - see below).

Ce film mince est de tout type connu approprié, tant du point de vue matériau constitutif que du point de vue épaisseur ; à titre d'exemple, il s'agit d'un film mince de polypropylène par exemple biorienté (notamment de type BOPP) ayant une épaisseur de quelques centièmes de millimètres, éventuellement métallisé.This thin film is of any known type suitable, both from the point of view of material constituting the point of view of thickness; for example, it is a polypropylene thin film for example bioriented (especially BOPP type) having a thickness of a few hundredths of a millimeter, optionally metallized.

Le film mince 1 comporte, à partir d'un point A0 du contour, une amorce de rupture 3 constituée par une découpe de longueur limitée, notée A0B0, partant du contour selon une orientation quelconque.The thin film 1 comprises, starting from a point A 0 of the contour, a breaking primer 3 constituted by a cut of limited length, denoted by A 0 B 0 , starting from the contour in any orientation.

La fonction de cette découpe 3 est de délimiter, conjointement avec le contour de l'ouverture 2, une portion de préhension 4 apte à être saisie entre des doigts d'un utilisateur.The function of this cutout 3 is to delimit, together with the contour of the opening 2, a gripping portion 4 adapted to be gripped between the fingers of a user.

Dans l'exemple considéré, l'amorce de déchirure 3 est sensiblement tangente au contour de l'ouverture, en A0, de sorte que la portion de préhension constitue une languette, avant même que l'on commence à lui appliquer une traction transversalement au plan du film.In the example under consideration, the tear initiation 3 is substantially tangent to the contour of the opening, at A 0 , so that the gripping portion constitutes a tongue, even before the transverse traction is begun to be applied to it. on the plane of the film.

Cette portion de préhension est délimitée d'un côté par l'amorce de déchirure 3 (qui va pouvoir se propager) et de l'autre côté par le contour 2 (qui va, en un premier temps, piéger le déplacement de l'extrémité interne de l'amorce - voir ci-dessous).This gripping portion is delimited on one side by the tear primer 3 (which will be able to propagate) and on the other side by the contour 2 (which will, at first, trap the displacement of the end internal of the primer - see below).

La figure 2 représente le film d'emballage dans une configuration de départ dans laquelle la languette, initialement située dans le plan du film 1, a été relevée, par les doigts d'un utilisateur, dans une direction sensiblement perpendiculaire à ce plan. Ce redressement de la languette se traduit spontanément par la formation d'un pli 5 (c'est-à-dire d'une zone de très faible rayon de courbure) partant sensiblement de l'extrémité externe de l'amorce de déchirure A0B0, c'est-à-dire du point Bo, jusqu'au contour 2 en étant tangent à celui-ci (le point de tangence en cette configuration de départ est noté C0).The figure 2 represents the packaging film in a starting configuration in which the tab, initially located in the plane of the film 1, has been raised, by the fingers of a user, in a direction substantially perpendicular to this plane. This straightening of the tongue spontaneously results in the formation of a fold 5 (that is to say a very weak zone). radius of curvature) extending substantially from the outer end of the tear initiation A 0 B 0 , that is, from the point Bo, to the contour 2 being tangent thereto (the point of tangency in this starting configuration is noted C 0 ).

Cette configuration prise spontanément par la languette a pour avantage que, si on exerce sur la languette une traction en sorte de l'écarter du plan du film, une déchirure 3A se produit dans le prolongement de l'amorce de déchirure initiale A0B0 tandis que la zone 5 de faible rayon de courbure (qui s'apparente ici à un pli) se déplace dans le film, en s'étendant depuis la nouvelle extrémité B de la ligne de déchirure jusqu'au contour tout en tendant à être tangent à celui-ci en un point C (B et C désignent les positions courantes des extrémités du pli).This configuration, taken spontaneously by the tongue, has the advantage that, if the tongue is pulled so as to move it away from the plane of the film, a tear 3A occurs in the extension of the initial tearing primer A 0 B 0 while the zone 5 of small radius of curvature (which is here a fold) moves in the film, extending from the new end B of the tear line to the contour while tending to be tangent to this one at a point C (B and C designate the current positions of the ends of the fold).

On a constaté que cette relation géométrique tend à se conserver, c'est-à-dire que, à fur et à mesure que progresse la déchirure, le pli tourne autour de l'ouverture en restant tangent au contour de celle-ci. C'est ainsi que la figure 3 représente une configuration où le pli 5 a tourné dans le sens trigonométrique autour de l'ouverture, tout en restant tangent en C au contour de cette dernière, tandis que l'extrémité B de la déchirure 3A, donc cette déchirure elle-même, décrit une courbe assimilable à une spirale, de sorte que la languette 4 s'élargit progressivement. La spirale diverge d'autant plus vite que les dimensions de l'ouverture sont importantes.It has been found that this geometric relation tends to be preserved, that is to say that, as the tear progresses, the fold rotates around the opening while remaining tangent to the contour of the latter. This is how the figure 3 represents a configuration where the fold 5 has turned in the trigonometric direction around the opening, while remaining tangent at C to the contour of the latter, while the end B of the tear 3A, thus this tear itself, describes a curve assimilable to a spiral, so that the tongue 4 widens gradually. The spiral diverges all the more quickly as the dimensions of the opening are important.

On comprend que, plus la direction de traction est proche d'une direction perpendiculaire au plan du film, plus l'angle du pli 5 (c'est-à-dire l'angle entre le plan du film et la zone de languette située auprès de ce pli) est constant. Il est de ce fait préférable que la direction de traction soit aussi exactement perpendiculaire que possible au plan du film, mais la pratique a montré que cela n'est pas critique (à titre d'exemple, un écart d'une dizaine de degrés est tout à fait acceptable (une traction par les doigts d'un opérateur n'est généralement pas exactement perpendiculaire au plan du film)).It is understood that, the closer the direction of traction is to a direction perpendicular to the plane of the film, the greater the angle of the fold 5 (that is to say the angle between the film plane and the tongue zone near this fold) is constant. It is therefore preferable that the direction of traction is as perpendicular as possible to the plane of the film, but practice has shown that this is not critical (for example, a difference of about ten degrees is quite acceptable (a traction by the fingers of an operator is usually not exactly perpendicular to the plane of the film)).

Il a été observé que ce phénomène continue à apparaître, même lorsque le pli atteint et dépasse le point A0, c'est-à-dire que, au-delà de ce point A0, le pli tend à rester tangent au bord de l'ouverture, désormais formé par le début de la ligne de déchirure (l'amorce A0B0 puis la suite 3A de la déchirure).It has been observed that this phenomenon continues to appear, even when the fold reaches and exceeds the point A 0 , that is to say that, beyond this point A 0 , the fold tends to remain tangent to the edge of the opening, now formed by the beginning of the tear line (the primer A 0 B 0 then the 3A continuation of the tear).

La poursuite de la traction de la languette se traduit dans les faits par la propagation de la déchirure 3 selon une courbe en spirale jusqu'à atteindre un bord du film. Le film d'emballage peut alors être enlevé en une seule partie.The continuation of the pulling of the tongue actually results in the propagation of the tear 3 in a spiral curve until reaching an edge of the film. The packaging film can then be removed in one piece.

Il a été indiqué ci-dessus que, lorsque l'on tend à déchirer une languette à partir d'un film, les lignes latérales de déchirure tendent à converger. Tout se passe ici comme si la déchirure 3A (bord externe) tendait à se rapprocher de l'autre bord (bord interne) de la languette, c'est-à-dire du contour de l'ouverture 2, puis la déchirure elle-même, mais avec une courbure qui est moindre que la courbure de ce bord interne, de sorte que, contrairement aux languettes de l'état de la technique, cette tendance à la convergence ne suffit pas pour permettre au bord externe 3A de se rapprocher de son bord interne, d'où une progression continue de la déchirure jusqu'à un bord du film (ou au moins jusqu'au bord de la partie plane du film lorsque celui-ci enveloppe un produit).It has been indicated above that, when one tends to tear a tab from a film, the tear side lines tend to converge. Everything happens here as if the tear 3A (outer edge) tended to approach the other edge (inner edge) of the tongue, that is to say the contour of the opening 2, and then the tear itself. same, but with a curvature that is less than the curvature of this inner edge, so that, unlike the tabs of the state of the art, this tendency to convergence is not enough to allow the outer edge 3A to get closer to its internal edge, where a continuous progression of the tear to an edge of the film (or at least to the edge of the flat part of the film when it wraps a product).

Il a été précisé que le contour de l'ouverture 2 est arrondi, au moins en dehors du point A0. En effet, un point anguleux de ce contour, dont la pointe serait orientée vers l'extérieur de l'ouverture, serait susceptible de constituer, du fait des contraintes appliquées à la languette, une amorce de rupture qui ferait apparaître une seconde ligne de déchirure, intempestive, qui pourrait converger, jusqu'à l'intercepter, vers la ligne 3. Bien entendu, ce commentaire ne s'applique pas au point A0 puisque l'amorce de déchirure passe par ce point, de sorte qu'il importe peu, pour le début de la propagation de la déchirure, que l'ouverture présente ou non un point anguleux au point A0; après que la déchirure a fait un tour de spirale, il importe peu également que le point A0 forme ou non un point anguleux, puisqu'un tel point anguleux n'a pas sa pointe dirigée vers l'extérieur de l'ouverture.It has been specified that the contour of the opening 2 is rounded, at least outside the point A 0 . Indeed, an angular point of this contour, the tip of which would be oriented towards the outside of the opening, would be likely to constitute, because of the stresses applied to the tongue, a rupture primer which would reveal a second line of tearing , inadvertent, which could converge, until intercepted, to line 3. Of course, this comment does not apply to the point A 0 since the tear initiation goes through this point, so it matters little, for the beginning of the propagation of the tear, whether or not the opening has a sharp point at the point A 0 ; after the tear has made a spiral turn, it does not matter whether or not the point A 0 forms an angular point, since such a sharp point does not have its point directed towards the outside of the opening.

On comprend qu'il est également avantageux qu'il n'y ait pas, dans l'amorce de déchirure 3, de point anguleux présentant sa pointe dirigée vers l'extérieur puisque, après avoir franchi le point A0, le pli 5 tend à rester tangent au nouveau bord constitué par l'amorce de déchirure 3 puis la déchirure 3A. Le plus simple est de donner à l'amorce de déchirure une forme dépourvue de tout point anguleux.It will be understood that it is also advantageous if there is no angular point in the tearing primer 3 having its point directed outwardly since, after passing through the point A 0 , the fold 5 tends to stay tangent to the new edge constituted by the tear initiation 3 and then the tear 3A. The simplest is to give the tear primer a shape devoid of any sharp point.

Dans l'exemple représenté, la ligne de déchirure 3A se propage au-delà de B0 dans le prolongement de l'amorce de déchirure 3, de sorte que, lorsque le pli 5 atteint le point B0, après la propagation de la déchirure sur un tour en étant tangent au bord constitué par l'amorce de déchirure 3A, il le franchit tout en restant tangent à la déchirure 3A qui a démarré à partir de B0.In the example shown, the tear line 3A propagates beyond B 0 in the extension of the tear primer 3, so that when the fold 5 reaches the point B 0 , after the propagation of the tear on a turn being tangent to the edge constituted by the tear primer 3A, it crosses while remaining tangent to the tear 3A which started from B 0 .

Toutefois, on comprend que (voir ci-dessus à propos du caractère arrondi du bord de l'ouverture 2), si le point B0 constitue un point anguleux dont la pointe est dirigée vers l'extérieur, il peut provoquer le démarrage d'une ligne de déchirure intempestive lorsqu'il est atteint par le pli. Il est donc avantageux d'éviter cette configuration. Puisque la propagation de la déchirure à partir du point B0, au moment où commence la traction sur la languette, tend à se faire pratiquement perpendiculairement au pli 5 (donc perpendiculairement à B0C0), on comprend qu'il est avantageux que la tangente en B0 à l'amorce de déchirure 3 soit perpendiculaire à la ligne tangente à l'ouverture 2 en passant par B0 (voir l'angle droit représenté en B0 à la figure 2). On comprend toutefois que, si la déchirure 3A part du point B0 en formant un angle supérieur à 90°, il en découlera que ce point B0 constitue un point anguleux entre l'amorce 3 et la ligne de déchirure 3A, mais puisque la pointe de ce point anguleux n'est pas dirigée vers l'extérieur de l'ouverture, il n'y aura pas de risque de déchirure secondaire lorsque le pli franchira ce point B, après un tour de déchirure. En d'autres termes, il est préférable que l'amorce de déchirure 3 soit découpée d'une manière telle que l'angle formé en B0 par la tangente à cette amorce de déchirure et la tangente à l'ouverture 2 passant par ce point B0 (c'est-à-dire B0C0) soit supérieur ou égal à 90°.However, it is understood that (see above about the roundness of the edge of the opening 2), if the point B 0 constitutes a sharp point whose tip is directed outwards, it can cause the start of an untimely tear line when hit by the fold. It is therefore advantageous to avoid this configuration. Since the propagation of the tear from the point B 0 , at the moment when the pulling on the tongue begins, tends to be practically perpendicular to the fold 5 (hence perpendicular to B 0 C 0 ), it is understood that it is advantageous that the tangent at B 0 at the tear initiation 3 is perpendicular to the line tangent to the opening 2 through B 0 (see the right angle shown in B 0 at the figure 2 ). However, it is understood that, if the tear 3A starts from the point B 0 forming an angle greater than 90 °, it follows that this point B 0 constitutes a sharp point between the primer 3 and the tear line 3A, but since the the point of this angular point is not directed towards the outside of the opening, there will be no risk of secondary tearing when the fold will cross this point B, after a tear turn. In other words, it is preferable that the tear initiation 3 is cut in such a way that the angle formed at B 0 by the tangent to this tear initiation and the tangent to the opening 2 passing through this point B 0 (that is B 0 C 0 ) is greater than or equal to 90 °.

En pratique une autre manière de minimiser les risques de déchirure intempestive lors du franchissement du point B0 est de donner à l'amorce de déchirure une forme courbe dont la concavité est tournée vers l'ouverture ; cette amorce de déchirure peut en particulier avoir la forme d'un début de spirale.In practice another way of minimizing the risk of inadvertent tearing when crossing the point B 0 is to give the tear primer a curved shape whose concavity is turned towards the opening; this tear initiation can in particular be in the form of a spiral start.

Il est rappelé que le risque de départ intempestif d'une ligne de déchirure dépend aussi des propriétés mécaniques du matériau constitutif du film, de sorte qu'on peut aussi minimiser le risque de déchirure intempestif par le choix d'un matériau ayant une fragilité limitée.It is recalled that the risk of inadvertent departure of a tear line also depends on the mechanical properties of the material constituting the film, so that the risk of inadvertent tearing can also be minimized by choosing a material with limited brittleness.

Par contre, après le franchissement de ce point B0, il n'y a plus de point anguleux le long du contour auquel le pli tend à être tangent, puisque ce contour est alors la ligne 3A, dont il a été dit qu'elle avait la forme d'une spirale.On the other hand, after crossing this point B 0 , there is no more angular point along the contour at which the fold tends to be tangent, since this contour is then the line 3A, which has been said to be had the shape of a spiral.

Il a été indiqué que l'angle que forme l'amorce de déchirure avec le contour 2 est quelconque. En fait, si l'on conforme cette amorce 3 suivant une tangente au contour 2 (s'il est arrondi, de préférence circulaire), la languette ainsi formée est étroite, de sorte qu'il est avantageux que cette languette ait une longueur suffisante pour minimiser le risque que, au début de la propagation de la déchirure à partir du point B0, cette déchirure converge vers le contour 2 dans le cas d'un défaut de maîtrise de l'orientation de la traction appliquée à cette languette. Il peut donc paraître préférable de conformer l'amorce de déchirure en sorte qu'elle présente un angle non nul avec la tangente locale au contour, c'est-à-dire qu'elle ne soit pas tangente à ce contour ; par contre, si cet angle augmente, la largeur de la languette augmente, mais il est préférable (voir ci-dessus) de courber cette amorce de déchirure en sorte de tourner sa concavité vers l'intérieur de l'ouverture.It has been stated that the angle formed by the tear initiation with contour 2 is arbitrary. In fact, if this primer 3 is conformed to a tangent to the contour 2 (if it is rounded, preferably circular), the tongue thus formed is narrow, so that it is advantageous if this tongue has a sufficient length. to minimize the risk that, at the beginning of the propagation of the tear from the point B 0 , this tear converges to the contour 2 in the case of a lack of control of the orientation of the traction applied to this tab. It may therefore seem preferable to conform the tear initiation so that it has a non-zero angle with the tangent local contour, that is to say, it is not tangent to this contour; on the other hand, if this angle increases, the width of the tongue increases, but it is preferable (see above) to bend this tear initiation so as to turn its concavity towards the inside of the opening.

Les figures 4 à 6 représentent ainsi une variante des figures 1 à 3 ; les éléments similaires à ceux de ces figures sont désignés par des signes de référence qui se déduisent de ceux des figures 1 à 3 par l'ajout de l'indice « prime ». Le film 1' s'y distingue par le fait que l'amorce de déchirure 3' s'étend à partir du bord du point A0', sur le contour de l'ouverture 2', suivant un angle sensiblement égal à 90°, c'est-à-dire que l'amorce 3' est, auprès de ce point A0', sensiblement perpendiculaire à la tangente locale. Toutefois, cette amorce 3' est courbe, avec une courbure telle que, au point B0', sa tangente est sensiblement perpendiculaire à la direction du pli 5' (entre les points B0' et C0') qui se forme dès que l'on applique une traction sur la languette perpendiculairement au plan du film. Comme indiqué ci-dessus, cette traction se traduit par une propagation de la déchirure, au-delà de B0', dans le prolongement de cette amorce, de sorte qu'il n'apparaît pas de point anguleux en ce point B0'. Après un tour de ce pli, celui-ci franchit donc sans difficulté ce point B0'.The Figures 4 to 6 thus represent a variant of Figures 1 to 3 ; elements similar to those of these figures are designated by reference signs which are deduced from those of Figures 1 to 3 by adding the premium index. The film 1 'is distinguished by the fact that the tear initiation 3' extends from the edge of the point A 0 ', on the contour of the opening 2', at an angle substantially equal to 90 ° i.e., the primer 3 'is, near this point A 0 ', substantially perpendicular to the local tangent. However, this primer 3 'is curved, with a curvature such that, at the point B 0 ', its tangent is substantially perpendicular to the direction of the fold 5 '(between the points B 0 ' and C 0 ') which is formed as soon as traction is applied to the tongue perpendicular to the plane of the film. As indicated above, this traction results in a propagation of the tear, beyond B 0 ', in the extension of this primer, so that it does not appear angular point at this point B 0 '. After one turn of this fold, it passes without difficulty this point B 0 '.

La longueur de ce tronçon A0B0 (ou A0'B0') est en pratique choisie en sorte de permettre une saisie aisée, par les doigts d'un utilisateur, de la languette délimitée par cette découpe et le contour de l'ouverture ; une longueur de l'ordre de 0.5 cm à 1 cm (voire 1.5 cm ou même 3 cm) est une plage qui semble tout à fait appropriée pour des ouvertures 2 ou 2' ayant une dimension transversale moyenne (il s'agit d'un diamètre si ces ouvertures sont effectivement circulaires) de quelques centimètres (typiquement comprise entre 1 et 3 cm). Les dimensions de la spirale alors obtenue par traction sur cette languette sont suffisamment importantes pour assurer un dégagement raisonnablement rapide (en un nombre raisonnable de tours) du film vis-à-vis du produit qu'il sert à emballer. Bien entendu, des dimensions supérieures sont possibles.The length of this section A 0 B 0 (or A 0 'B 0 ') is in practice chosen so as to allow easy grasping, by the fingers of a user, of the tongue delimited by this cut and the outline of the 'opening ; a length of the order of 0.5 cm to 1 cm (or even 1.5 cm or even 3 cm) is a range that seems quite appropriate for openings 2 or 2 'having a mean transverse dimension (it is a diameter if these openings are actually circular) of a few centimeters (typically between 1 and 3 cm). The dimensions of the spiral then obtained by traction on this tongue are large enough to ensure a reasonably rapid release (in a reasonable number of turns) of the film vis-à-vis the product it is used to pack. Of course, larger dimensions are possible.

Il apparaît ainsi que le fait de prévoir une ouverture 2 (ou 2') dans le film, avec une amorce 3 (ou 3') prédécoupée qui part du contour de cette ouverture, a pour effet d'imposer un chemin prédéterminé au bord interne (en particulier à l'extrémité interne) de la languette, au fur et à mesure qu'on tire cette languette à l'écart du plan du film tandis que son bord externe se déchire, ce bord interne imposé étant tout d'abord le contour de l'ouverture, puis le contour de la déchirure 3A (ou 3A'), après un tour de la languette autour de l'ouverture. Il y en effet un piégeage du bord interne de la languette, et donc de son extrémité interne, à l'intérieur de l'ouverture initiale (pendant environ le premier demi-tour) puis de l'ouverture définie par la progression de la spirale.It thus appears that the fact of providing an opening 2 (or 2 ') in the film, with a pre-cut primer 3 (or 3') which leaves the contour of this opening, has the effect of imposing a predetermined path on the inner edge (in particular at the inner end) of the tongue, as one pulls this tab away from the plane of the film while its outer edge is torn, this imposed internal edge being first the outline of the opening, then the contour of the tear 3A (or 3A '), after a round of the tab around the opening. There is indeed a trapping of the inner edge of the tongue, and therefore of its inner end, inside the initial opening (during about the first half-turn) and the opening defined by the progression of the spiral .

En fait, l'ouverture 2 (ou 2') est susceptible de constituer localement un défaut dans la protection du produit assurée par le film d'emballage ; en effet, des poussières, notamment, peuvent pénétrer jusqu'au produit en traversant le film via cette ouverture. Toutefois, cet inconvénient peut aisément être supprimé en prévoyant, sous le film, ou au dessus de celui-ci, une protection localisée à la zone comportant cette ouverture.In fact, the opening 2 (or 2 ') is likely to locally constitute a defect in the protection of the product provided by the packaging film; indeed, dust, in particular, can penetrate to the product through the film via this opening. However, this disadvantage can easily be eliminated by providing, under the film, or above it, protection located in the area comprising this opening.

Lorsque la zone prédécoupée du fait de la présence de l'amorce de déchirure est petite, on peut améliorer la facilité de préhension en engageant une bande additionnelle en tout matériau approprié formant une tirette.When the pre-cut area due to the presence of the tear primer is small, the ease of gripping can be improved by engaging an additional strip of any suitable material forming a pull tab.

Les figures 7 à 9 représentent un autre exemple de réalisation d'un film mince d'emballage conforme à l'invention, qui ne présente pas l'inconvénient d'un tel défaut potentiel de protection.The Figures 7 to 9 represent another embodiment of a packaging thin film according to the invention, which does not have the disadvantage of such a potential protection fault.

Les éléments similaires à ceux des figures 1 à 3 sont désignés par des chiffres de référence qui se déduisent de ceux de ces figures 1 à 3 par addition du nombre 10 ; quant aux lettres, elles sont différentes.Elements similar to those of Figures 1 to 3 are designated by reference numbers which are deduced from those of these Figures 1 to 3 by adding the number 10; as for the letters, they are different.

Ainsi, ces figures représentent un film mince d'emballage 11 comportant une zone de référence 12 dont le contour fermé 12A est arrondi et dans lequel une languette 14 est prédécoupée. Un bord de cette languette est une amorce de déchirure 13 constituée par une découpe de longueur limitée, notée E0F0 ; cette languette forme, lorsqu'elle est tirée à l'écart du plan du film mince d'emballage, un pli 15.Thus, these figures represent a thin packaging film 11 comprising a reference zone 12 whose closed contour 12A is rounded and in which a tongue 14 is pre-cut. An edge of this tongue is a tear initiation 13 constituted by a cut of limited length, denoted E 0 F 0 ; this tongue forms, when pulled away from the plane of the thin packaging film, a fold 15.

Le film mince 11 se distingue de celui des figures 1 à 3 par le fait que, au lieu de s'interrompre le long du contour de l'ouverture 2, il se prolonge dans la zone 12, celle-ci étant bordée par une boucle en matériau de renforcement 16, qui longe intérieurement le contour 12A. L'amorce de déchirure 13 s'étend depuis le contour interne de la boucle 16 (à partir du point marqué E0), au travers de cette boucle jusqu'au point G0 situé sur le contour 12A, et à l'extérieur de celle-ci jusqu'au point F0.The thin film 11 is different from that of the Figures 1 to 3 in that, instead of interrupting along the contour of the opening 2, it extends into the zone 12, the latter being bordered by a loop of reinforcing material 16, which runs along the contour 12A inwardly. The tear initiation 13 extends from the internal contour of the loop 16 (from the point marked E 0 ), through this loop to the point G 0 located on the contour 12A, and outside of this one up to the point F 0 .

En outre, une seconde amorce de déchirure 17 est avantageusement prévue le long du contour intérieur de la boucle 16 à partir du point E0, jusqu'à un point noté H0. La languette 14 peut ainsi être redressée par rapport au plan du film mince sans le moindre effort.In addition, a second tear initiation 17 is advantageously provided along the inner contour of the loop 16 from the point E 0 , to a point noted H 0 . The tongue 14 can thus be straightened with respect to the plane of the thin film without any effort.

Toutefois, en variante, cette amorce de déchirure 17 peut être omise, le passage d'un ongle (ou tout autre outil) au travers de la prédécoupe E0F0 étant suffisant pour provoquer un début de déchirure le long du contour interne de la boucle 16.However, alternatively, this tear primer 17 may be omitted, the passage of a nail (or any other tool) through the precut E 0 F 0 being sufficient to cause a tear beginning along the inner contour of the loop 16.

On comprend qu'un tel film ne comporte pas de défaut de protection à l'emplacement de la zone 12.It is understood that such a film has no defect in the location of the zone 12.

On comprend en outre que, par traction sur la languette dans un sens propre à l'éloigner du plan du film, on tend à provoquer une propagation de la déchirure, notée 13A, de manière tout à fait analogue à ce qui a été expliqué à propos de la propagation de la déchirure 3 dans le film mince des figures 1 à 3 : cette déchirure se propage selon une ligne en spirale (la lettre F désigne la position courante de l'extrémité externe de la déchirure tandis que la lettre H désigne la position courante de l'extrémité interne de la déchirure interne).It is furthermore understood that, by pulling on the tab in a direction suitable for moving it away from the plane of the film, it tends to cause propagation of the tear, noted 13A, in a manner quite similar to that which has been explained in FIG. about the propagation of tear 3 in the thin film of Figures 1 to 3 This tear propagates along a spiral line (the letter F designates the current position of the outer end of the tear while the letter H designates the current position of the inner end of the internal tear).

En effet, le contour interne de la boucle 16 se comporte, lors de la traction sur la languette, comme le bord de l'ouverture 2. Ainsi, que la déchirure 17 ait été prédécoupée ou qu'elle soit apparue lors du passage d'un ongle au travers de l'amorce E0F0 de déchirure, cette déchirure 17 ne peut se propager que le long du bord interne de la boucle 16, puisqu'elle ne peut traverser cette boucle (puisque celle-ci est en matériau de renforcement, il est plus facile pour la déchirure 17 de se propager dans le film, à l'intérieur de la boucle 16, que de traverser cette boucle). En d'autres termes, l'extrémité interne de la languette est, au moins au début de la propagation de la déchirure, piégée à l'intérieur du contour 12A, le long du contour interne de la boucle 16.Indeed, the internal contour of the loop 16 behaves, when pulling on the tongue, as the edge of the opening 2. Thus, the tear 17 has been precut or it appeared during the passage of a nail through the primer E 0 F 0 tear, this tear 17 can only propagate along the inner edge of the loop 16, since it can not cross this loop (since it is made of reinforcement, it is easier for the tear 17 to propagate in the film, inside the loop 16, than to cross this loop). In other words, the inner end of the tongue is, at least at the beginning of the propagation of the tear, trapped inside the contour 12A, along the inner contour of the loop 16.

Ainsi, à la figure 8, la languette 14 est juste redressée, avant de provoquer la propagation des extrémités des déchirures 13 et 17 au-delà des points F0 et H0, respectivement (voir les traits en tirets 13A et 17A). Par contre, on voit à la figure 9 une configuration dans laquelle la trace instantanée du pli 15 est sensiblement tangente au contour interne de la boucle 16, tandis que la déchirure 13A se propage selon une courbe en spirale.So, at the figure 8 the tongue 14 is just straightened, before causing the ends of the tears 13 and 17 to extend beyond the points F 0 and H 0 , respectively (see the dashed lines 13A and 17A). On the other hand, we see figure 9 a configuration in which the instantaneous trace of the fold 15 is substantially tangent to the inner contour of the loop 16, while the tear 13A propagates in a spiral curve.

On comprend que, après une fraction de tour du pli autour de la boucle (approximativement après un demi-tour), la propagation de la déchirure 17A s'interrompt (il devient plus facile pour la portion 12 du film de se plier avec la languette plutôt que de se déchirer le long du bord interne de la boucle). A partir de ce moment, la traction exercée sur la languette ne provoque plus, comme dans l'exemple des figures 1 à 3, que la propagation de la déchirure 13A, tandis que le pli continue de se déplacer le long du contour interne jusqu'à traverser la boucle, en franchissant le point Eo, puis le point G0 ; l'extrémité interne de la languette n'est alors plus piégée à l'intérieur du contour 12A. La suite de la propagation de la déchirure se produit alors, le long du contour défini par la déchirure 13, ainsi que cela a été décrit à propos des figures 1 à 3.It is understood that after a fraction of a turn of the fold around the loop (approximately after half a turn), the propagation of the tear 17A stops (it becomes easier for the portion 12 of the film to fold with the tongue rather than tearing along the inner edge of the loop). From this moment, the traction exerted on the tongue no longer provokes, as in the example of Figures 1 to 3 , that the propagation of the tear 13A, while the fold continues to move along the inner contour to cross the loop, crossing the point Eo, then the point G 0 ; the end internal of the tongue is no longer trapped inside the contour 12A. The continuation of the propagation of the tear then occurs along the contour defined by the tear 13, as has been described in connection with Figures 1 to 3 .

La plupart des commentaires exprimés à propos de cet exemple des figures 1 à 3 s'appliquent aussi à ce second exemple, y compris en ce qui concerne la géométrie de l'amorce de déchirure auprès de son extrémité F0 ; en particulier, cette amorce est avantageusement courbée de telle manière que la déchirure qui se produit du fait de la traction est dans le prolongement de l'amorce.Most of the comments made about this example of Figures 1 to 3 also apply to this second example, including the geometry of the tear initiation at its end F 0 ; in particular, this primer is advantageously curved in such a way that the tearing which occurs as a result of the traction is in the extension of the primer.

Toutefois, on peut noter que les risques mentionnés en cas de languette très étroite au tout début de la propagation sont bien moindres ici, car le risque que la déchirure 13A traverse la boucle à partir du point F jusqu'à rejoindre la déchirure 17 est infime compte tenu de la résistance du matériau constitutif de cette boucle.However, it may be noted that the risks mentioned in the case of very narrow tongue at the very beginning of the propagation are much lower here, because the risk that the tear 13A crosses the loop from the point F to reach the tear 17 is minute given the strength of the constituent material of this loop.

C'est pourquoi ce second exemple se prête particulièrement bien à des amorces faiblement inclinées par rapport à la tangente locale au contour (de préférence inférieure à 15°).This is why this second example lends itself particularly well to primers that are slightly inclined with respect to the local tangent to the contour (preferably less than 15 °).

Toutefois, comme indiqué précédemment, l'invention n'est pas limitée à une quelconque valeur d'angle entre l'amorce de déchirure et le contour extérieur de la zone renforcée.However, as indicated above, the invention is not limited to any angle value between the tear initiation and the outer contour of the reinforced zone.

Cette boucle 16 est par exemple constituée d'une surépaisseur constituée du même matériau que le film mince. Il peut aussi s'agir de polyéthylène, de polypropylène (éventuellement biorienté), voire de métal, notamment.This loop 16 is for example made of an extra thickness consisting of the same material as the thin film. It may also be polyethylene, polypropylene (possibly bioriented), or even metal, in particular.

Cette boucle est avantageusement rapportée au film mince sous celui-ci, de manière à ne pas risquer de s'accrocher avant le moment où le film doit être enlevé. Il a été constaté que cette disposition ne nuit pas à la solidité de la liaison entre cette boucle et le film mince, lors de l'application de la traction sur la languette.This loop is advantageously attached to the thin film under it, so as not to risk clinging before the time when the film must be removed. It has been found that this arrangement does not affect the strength of the connection between this loop and the thin film, during the application of traction on the tongue.

Cette boucle est avantageusement annulaire auquel cas sa dimension transversale moyenne est un diamètre ; cette dimension transversale moyenne est avantageusement de l'ordre du centimètre, par exemple comprise entre 1 cm et 3 cm, comme précédemment. On comprend que, compte tenu de cette petite taille, il est bien plus facile de mettre en place une telle boucle que de mettre en place une bande tout au long d'une ligne de déchirure souhaitée, comme dans des solutions connues.This loop is advantageously annular in which case its average transverse dimension is a diameter; this average transverse dimension is advantageously of the order of one centimeter, for example included between 1 cm and 3 cm, as before. It is understood that, given this small size, it is much easier to set up such a loop that to set up a strip along a desired tear line, as in known solutions.

La largeur de la boucle (c'est-à-dire la largeur de la bande de renforcement constituant cette boucle) est avantageusement de l'ordre de quelques millimètres, par exemple comprise entre 1 et 5 mm (cela peut dépendre du matériau constitutif ; plus le matériau est résistant, moins sa largeur a besoin d'être importante).The width of the loop (that is to say the width of the reinforcing strip constituting this loop) is advantageously of the order of a few millimeters, for example between 1 and 5 mm (this may depend on the constituent material; the stronger the material is, the less important the width needs to be).

Comme précédemment, les dimensions peuvent être bien plus grandes ; il appartient à l'homme de métier de choisir des dimensions appropriées en fonction de l'application envisagée (notamment des dimensions du produit emballé).As before, the dimensions can be much larger; it is up to the person skilled in the art to choose appropriate dimensions according to the intended application (in particular the dimensions of the packaged product).

Les figures 10 à 12 représentent une variante des figures 7 à 9. Les éléments similaires à ceux de ces figures sont désignés par des signes de référence qui se déduisent de ceux des figures 7 à 9 par l'addition de l'indice « prime ».The Figures 10 to 12 represent a variant of Figures 7 to 9 . Elements similar to those of these figures are designated by reference signs which are deduced from those of Figures 7 to 9 by the addition of the "premium" index.

La principale différence entre le film 11' de ces figures 10 à 12 par rapport au film 11 des figures 7 à 9 réside dans le fait que l'amorce de déchirure 13', non seulement traverse la boucle 16' de renforcement, mais pénètre en outre à l'intérieur de la zone médiane 12, jusqu'à un point noté J'0. Lors de l'application d'une traction à la portion de préhension J'0F'0 ainsi formée, une déchirure se produit à partir du point F'0, comme dans l'exemple des figures 7 à 9, tandis qu'une autre déchirure se produit à partir du point J'0, à l'opposé de l'amorce elle-même ; cette autre déchirure 17' se propage spontanément d'une manière quelconque, mais dès qu'elle rencontre le contour interne de la boucle 16', elle est contrainte de suivre, comme dans l'exemple des figures précitées, le contour interne de cette boucle. Comme précédemment, il y a donc un piégeage de l'extrémité interne de l'amorce de déchirure 13' à l'intérieur du contour externe 12A' de cette boucle (ce piégeage a même lieu à l'intérieur du contour interne de cette boucle).The main difference between the 11 'film of these Figures 10 to 12 compared to movie 11 of Figures 7 to 9 resides in the fact that the tearing primer 13 'not only passes through the reinforcement loop 16', but furthermore penetrates inside the median zone 12, to a point marked J ' 0 . When applying traction to the gripping portion J ' 0 F' 0 thus formed, a tear occurs from the point F ' 0 , as in the example of Figures 7 to 9 while another tear occurs from the point J ' 0 , opposite the primer itself; this other tear 17 'propagates spontaneously in some way, but as soon as it meets the inner contour of the loop 16', it is constrained to follow, as in the example of the aforementioned figures, the internal contour of this loop . As before, there is therefore a trapping of the inner end of the tear initiation 13 'inside the outer contour 12A' of this loop (this trapping even takes place inside the internal contour of this loop ).

Selon une variante non représentée, le matériau de renforcement n'est pas limité à une boucle à l'intérieur du contour 12A, mais se prolonge sur toute la zone 12 ; en d'autres termes ce matériau de renforcement a la forme d'un disque, à contour circulaire ou non (il peut s'agir d'une zone massive de contour quelconque). Dès lors que ce matériau de renforcement est suffisamment peu déchirable, le fait d'appliquer une traction à la portion de préhension définie par l'amorce provoque une propagation de la seule extrémité qui peut se propager, à savoir l'extrémité externe située à l'extérieur de cette zone de renforcement tandis que l'extrémité interne est piégée dans cette zone de renforcement ; cet effet de piégeage cesse dès que, comme dans le cas des figures 7 à 12, cette zone de renforcement commence à se plier, auquel cas la déchirure continue, tandis que le pli de la languette tourne en restant tangent à la déchirure 13A, en continuant la spirale qui a commencé à se former.According to a variant not shown, the reinforcing material is not limited to a loop within the contour 12A, but extends over the entire zone 12; in other words this reinforcing material is in the form of a disk, with a circular contour or not (it can be a massive zone of any contour). As soon as this reinforcing material is sufficiently undrillable, the fact of applying traction to the gripping portion defined by the primer causes propagation of the only end that can be propagated, namely the external end located at the end. outside this reinforcing zone while the inner end is trapped in this reinforcement zone; this trapping effect ceases as soon as, as in the case of Figures 7 to 12 this reinforcing zone begins to bend, in which case the tear continues, while the fold of the tongue rotates while remaining tangent to the tear 13A, continuing the spiral that has begun to form.

Ainsi on constate qu'il y a plusieurs configurations selon l'invention ; dans un premier exemple, le film mince a une plus grande résistance que le vide situé à l'intérieur du contour 2 (le bord de l'ouverture constituée par ce vide confine la propagation de l'extrémité interne de l'amorce de déchirure), tandis que, dans un second exemple, le contour est longé intérieurement par un matériau de renforcement qui confine également l'extrémité interne de l'amorce de déchirure. On comprend que d'autres configurations sont possibles ; c'est ainsi que, selon encore un autre exemple, lorsque le contour est bordé intérieurement par un matériau de renforcement, lequel a la forme d'une boucle, la partie résiduelle, à l'intérieur de cette boucle peut être une ouverture sans matériau, être formée d'un film de propriétés différentes de celles du film à l'extérieur du contour ou au contraire être formée du même film déchirable qu'à l'extérieur.Thus, it can be seen that there are several configurations according to the invention; in a first example, the thin film has a greater resistance than the vacuum located inside the contour 2 (the edge of the opening constituted by this vacuum confines the propagation of the inner end of the tear primer) while in a second example the outline is internally lined by a reinforcing material which also confines the inner end of the tear primer. It is understood that other configurations are possible; Thus, according to yet another example, when the contour is lined internally by a reinforcing material, which has the shape of a loop, the residual part, inside this loop can be an opening without material. , be formed of a film of properties different from those of the film outside the contour or on the contrary be formed of the same tear-off film as outside.

Claims (12)

  1. Thin packaging film (1, 1', 11, 11') comprising a reference area (2, 2', 12, 12') having a closed contour and being surrounded over its entire periphery by a tear-off area, an incipient tear (3, 3', 13, 13') being precut in this film so as to intercept this contour, leading into the latter and having a first end located on this contour or within same and a second end located in the tear-off area while forming a gripping portion (4, 4', 14, 14') capable of being pulled away from the plane of this thin film, said reference area having, at least along the closed contour, a tear-resistance substantially different from that of the tear-off area so as to trap an edge of this gripping portion from the first end of this incipient tear within said contour while the tear line propagates (3A, 3A', 13A, 13A') in a spiral beyond the second end in the tear-off area over at least 180° around this reference area when the gripping portion begins to undergo such pulling.
  2. Thin film according to claim 1, characterized in that the reference area comprises at least a central area having a tear-resistance lower than that of the surrounding material.
  3. Thin film according to claim 1 or claim 2, characterized in that the closed contour of the reference area is skirted on the inside by a material having a tear-resistance substantially lower than that of the tear-off area surrounding this closed contour.
  4. Thin film according to claim 1 or claim 2, characterized in that said reference area is an opening (2, 2') the edge of which constitutes the closed contour.
  5. Thin film according to claim 1 or claim 2, characterized in that the closed contour of the reference area is skirted on the inside by a reinforcement material (16, 16') having a tear-resistance substantially higher than that of the tear-off area.
  6. Thin film according to claim 5, characterized in that the closed contour of the reference area is skirted on the inside by a loop of said reinforcement material which is crossed by the incipient tear.
  7. Thin film according to claim 6, characterized in that the reference area comprises an opening bordered on the outside by said loop.
  8. Thin film according to claim 6, characterized in that the reference area comprises a central area (12, 12') surrounded by said loop, this central area having the same tear-resistance as the tear-off area surrounding the closed contour.
  9. Thin film according to claim 8, characterized in that a second incipient tear (17) is provided along the inner contour of said loop.
  10. Thin film according to any one of claims 1 to 9, characterized in that the second end (B, B', F, F') of the incipient tear is situated so that the tangent to said incipient tear (3, 3', 13, 13') at this point is substantially perpendicular to a tangent to the closed contour passing through this point.
  11. Thin film according to any one of claims 1 to 10, characterized in that the inner surface area of the closed contour is less than 5% of the packaging surface area of said film.
  12. Thin film according to any one of claims 1 to 11, characterized in that the gripping portion is in the form of a tab.
EP10805796.9A 2009-12-04 2010-12-02 Packaging foil with tear initiation Not-in-force EP2507146B1 (en)

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FR0958660A FR2953499B1 (en) 2009-12-04 2009-12-04 THIN FILM PACKAGING PRIMER OF RIP
PCT/FR2010/052599 WO2011067542A1 (en) 2009-12-04 2010-12-02 Thin packaging film having an incipient tear

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EP2507146A1 EP2507146A1 (en) 2012-10-10
EP2507146B1 true EP2507146B1 (en) 2014-07-02

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CL (1) CL2012001428A1 (en)
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CN108313506A (en) * 2018-02-11 2018-07-24 竹菱（大连）实业有限公司 Burst bar tearing notch mechanism and manufacturing device and manufacturing method
US10937341B2 (en) * 2018-09-17 2021-03-02 Apple Inc. Peel-able, tamper-evident security label for concealing information

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Publication number Priority date Publication date Assignee Title
US4779738A (en) * 1987-04-13 1988-10-25 Yoshino Kogyosho Co., Ltd. Synthetic resin container formed with spiral notched line
JPH074377U (en) * 1993-06-21 1995-01-24 富士写真フイルム株式会社 Package
LU91221B1 (en) * 2005-10-10 2007-08-09 Milorad Pavlovic Auxiliary tool for opening e.g. carry bag, has longitudinal seams formed into wrinkle and joined together in wrinkle seam, and slit-type indentations formed or strength of packing material is made weaker within wrinkle seam
US20070138248A1 (en) * 2007-01-31 2007-06-21 Hallmark Cards, Incorporated Gift packaging

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CL2012001428A1 (en) 2013-02-15
US8974883B2 (en) 2015-03-10
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FR2953499B1 (en) 2012-01-13
FR2953499A1 (en) 2011-06-10
US20120237713A1 (en) 2012-09-20

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