EP0712785A1 - Reclosable opening means for a bag - Google Patents

Reclosable opening means for a bag Download PDF

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Publication number
EP0712785A1
EP0712785A1 EP95402583A EP95402583A EP0712785A1 EP 0712785 A1 EP0712785 A1 EP 0712785A1 EP 95402583 A EP95402583 A EP 95402583A EP 95402583 A EP95402583 A EP 95402583A EP 0712785 A1 EP0712785 A1 EP 0712785A1
Authority
EP
European Patent Office
Prior art keywords
bag
head
sachet
box
edge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95402583A
Other languages
German (de)
French (fr)
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EP0712785B1 (en
Inventor
Henri Michoud
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Danone SA
Original Assignee
Groupe Danone SA
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Filing date
Publication date
Application filed by Groupe Danone SA filed Critical Groupe Danone SA
Publication of EP0712785A1 publication Critical patent/EP0712785A1/en
Application granted granted Critical
Publication of EP0712785B1 publication Critical patent/EP0712785B1/en
Anticipated expiration legal-status Critical
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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
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/04—Articles or materials enclosed in two or more containers disposed one within another
    • B65D77/06—Liquids or semi-liquids or other materials or articles enclosed in flexible containers disposed within rigid containers
    • B65D77/062—Flexible containers disposed within polygonal containers formed by folding a carton blank
    • 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
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/42—Details of containers or of foldable or erectable container blanks
    • B65D5/56—Linings or internal coatings, e.g. pre-formed trays provided with a blow- or thermoformed layer
    • B65D5/60—Loose, or loosely attached, linings

Definitions

  • the present invention relates to a device for closing and opening a package comprising a bag having a bag head whose edges are secured to one another.
  • Such sachets or pouches are produced continuously from a film according to the so-called "flowpack” process, then put in a box using a cartoner.
  • the European Patent EP-167 064 (NESTLE) relates to a reclosing type packaging comprising an outer envelope provided with a flap and a bag having a bag head whose base is folded and pinched by the flap which is folded down to the closure.
  • the opening of the sachet is carried out either by cutting the upper part of the head of the sachet, or by tearing the latter using a tearing member such as a wire or a strip.
  • British Patent GB-2,032,393 (TOPPAN PRINTING Co.) relates to a box lined with a bag which is not sealed at its two ends and which is formed from a band folded over on itself and welded longitudinally, this welding being carried out between an internal face and an external face.
  • the packaging is opened by tearing along the pre-cut lines which delimit the flap and the portion of the bag which doubles the flap.
  • the box is thus opened to release a central region, the bag remaining held in the box by the remaining part of the upper panel of the box, on either side of the flap. It is in practice necessary to make the bag from a material having a preferential direction of tearing, failing which one is dependent on the defects inherent in the "stringing" nature of the usual materials.
  • the present invention relates to a device for ensuring without deterioration the opening of a bag having a bag head whose internal edges are secured to each other and which requires neither manual cutting operation, nor setting uses specific pre-cutting means causing the bag to be torn.
  • the device also makes it possible to ensure at least partial reclosure thereof.
  • at least partial resealing we mean a closure of the package which may not be strictly sealed, but which nevertheless allows storage of the product for a period corresponding to the consumption of the contents of the sachet.
  • the invention thus relates to a device for closing and opening a package comprising a bag having a bag head having a first and a second edge secured to each other by their internal face with a first fastening force characterized in that it comprises a first element having a first region secured to the external face of the first edge with a second securing force, and a second element having a second region secured to the external face of the second edge with a third securing force joining, and in that the second and third joining forces are greater than the first joining force.
  • joining force we mean within the meaning of this application, the maximum force with which two edges, or an edge and an element, adhere to each other, force that must be passed to obtain a separation edges, or the edge and the corresponding element.
  • the first element may advantageously include a flap which extends it and which extends beyond the bag head, said flap cooperating, in the closed position, with the second element, for example by gluing, and / or by introduction of 'one end of the flap in a slot of the second element, the flap being folded around the head of the bag.
  • the first and / or the second elements are advantageously respectively a cover and / or a front face of the box which contains the sachet.
  • the bag is particularly advantageous for the bag to be secured to the box which contains it only at the level of the bag head. This produces a rise in the bag when the box is opened, which facilitates the gripping of the products.
  • the front face of the box can have a front edge folded down towards the cover of the box, and which is covered by the latter in said closed position.
  • the sachet head may have re-entrant lateral edges or "picks" at its longitudinal ends.
  • the invention uses a bag head, the edges of which are joined together with said first joining force by any known technique.
  • the side faces of the box have first and second folded side edges which are covered by the cover of the box in said closed position, which in particular makes it possible to fold the re-entrant edges towards the inside of the box. package.
  • the bag head can be cold sealed.
  • the bag head can advantageously have at least one, and preferably two, weld lines, for example of heat seal. This allows a low joining force to be obtained while ensuring the tightness of the sachet. Alternatively, the bag head has peelable streaks.
  • the seam head seal is a heat seal continuous surface of peelable type, for example of rectangular outline, and devoid of streaks. It advantageously has an opening force of the order of 1N for a length of the order of 200 mm, for example from 150 to 300 mm.
  • the bag may advantageously include a longitudinal closure strip extending over the height of the bag and having a junction zone with an edge of the bag head.
  • the sachet head may have, preferably in said junction zone, a localized portion in which the internal faces of the first and second edges are more loosely joined to one another so as to form a primer for separation.
  • the junction zone is preferably arranged on the second edge of the bag head.
  • the first region of the first element advantageously has a zone located opposite the junction zone.
  • the first region of the first element may have a smaller surface than that of the second region of the second element, and / or the first region of the first element may have a length , taken in the longitudinal direction of the head of the bag, which is less than that of the second element.
  • Stage a can be preceded by preliminary stage a o , namely: a o ) forming a continuous bagging tube running with a given running speed in which the products to be bagged are placed in given quantities at predetermined intervals,
  • the following step: b o introduce the sachet into a box so that the sachet head is adjacent to the non-folded cover of the box which constitutes the first element, the front face of the box constituting the second element.
  • the method comprises, during step a, a heat seal of the internal face of the first and second edges, said heat seal being produced in such a way that the junction zone has a localized region in which the internal faces of the first and second edges are more weakly secured to one another so as to form a primer for separation.
  • the sachet head comprises a surface heat seal of the peelable type and devoid of streaks.
  • it can be carried out between 100 ° C. and 180 ° C. and in particular between 125 ° C. and 140 ° C., in particular for a sack made of lacquered polypropylene, for example of standard thickness 26 ⁇ .
  • the bag head and the heat sealing jaws are preferably driven by a movement at reduced speed relative to said displacement speed, said movement possibly comprising a neutral point or a quasi-neutral point.
  • a soldering installation 52 comprises soldering irons 61 and 62 which may, for example, be heat-sealing irons, the various packages or bags 10 being separated by a cutting device 63 located between the irons 61 and 62.
  • the iron 61 makes it possible to make one or more heat seal lines 20 (see Figure 2a) on the head 17 of the package which has a fold of height 11 greater than the height 12 of the bottom 16 of the sachet or package 10.
  • the heat seal lines 20 arranged in the direction longitudinal of the bag head 17 ensure the sealing thereof while allowing its opening without tearing as will be shown later in the description.
  • the iron 62 which is used to heat seal the bottom of the bag 16 may conventionally include ridges arranged in the height direction of the packet, that is to say perpendicular to the longitudinal lines 20, so as to produce a heat seal classic.
  • the head of the bag 17 may also have ridges arranged in the height direction of the package, like those of the bottom of the bag 16, but in this case, it is preferable to bring the iron 61 to a lower temperature. to the one who would be necessary to achieve a real heat seal, so that the adhesion between the internal faces 46 and 47 of the edges 31 and 32 of the head 17 of the bag is relatively weak and that these can be easily separated without tearing the head of the bag 17.
  • the material must be effectively brought to a temperature between 140 ° C and 150 ° C, which corresponds to a temperature of the heat seal irons which is of the order of 180 ° C to 200 ° C, whereas if the material is only brought to a temperature between 80 ° C and 140 ° C, we obtain a less good adhesion characterized by its peelability, but which although not strictly waterproof (type welding "flesh on flesh” or “fine seal”), ensures good preservation of the products.
  • a sachet 10 contains two rows 41 and 42 superimposed of rusks, the front 11a and rear 11b faces of the package 10 connecting to the head of the sachet 17 by a rounded region 15.
  • the reference 12 designates the faces side of the bag 10.
  • Figure 2b shows the head of the bag 17 in a hypothetical open position. We can see the two edges 31 and 32 of the bag head 17 as well as the re-entrant side edges 34 and 35 which can be formed therein and which form "picks" also heat-sealed during the sealing of the bag 10 by the heat-sealing lines 20 of Figure 2a.
  • the front face lla of the bag 10 has over its entire height a longitudinal weld 67, made flat, or in a fold of material.
  • the weld 67 is connected at 68 to the heat-sealed lines 20, these lines 20 preferably being produced at a temperature such that, due to the extra thickness, the adhesion is weaker at 68 than in the rest of the lines 20, so as to produce a primer separation by facilitating the opening of the bag 10.
  • FIG. 3 shows a cartoner 70 flat in which the sachets 10 are introduced with a view to fitting them into a cardboard box 1.
  • the cartoner 70 makes it possible to close the bottom 4 of the box previously unfolded from a flattened box , while maintaining aligned with the rear face 9, the upper edge or cover 5 which is articulated at 38 to the rear face 9 and at 39 to a tongue 6, intended to be introduced, for example by a narrower end 7 into a slot 8, and while maintaining aligned with the front face 2, an extension 18 articulated at 44 to the front face 2.
  • the extension 18 forms a folding front edge.
  • the package 1 which comes out flat from the cartoner 70 is placed in a vertical position in the device 80 which makes it possible to close the upper edge 5 in accordance with the steps shown in FIGS. 4a to 4d.
  • the box 1 is in a vertical position, which makes it possible to give a reference position to the bag 10, the bottom 14 of which rests on the bottom 4 of the box 1, and the upper edge 5 and the flap 6 are placed in alignment with the rear face 9.
  • the edge 18 articulated at 44 is placed in the extension of the front face 2.
  • the head of the bag 17 is initially in the vertical position.
  • the extension 18 is folded inwardly of the package to form a front edge and a bonding line or surface 22 of length 14 which extends to the center is deposited, for example by projection, on its external face 56. less over part of its length.
  • the head of the bag 17 is folded towards the line or the adhesive surface 22 (FIG. 4b) then, the upper edge 5 which has on its internal face 55 a line or an adhesive surface 21 of length 13 previously deposited, for example by projection, is also folded back towards the head of the bag 17 (FIG. 4c), while the flap 6 is folded (FIG. 4d) around its articulation 39 to be glued by gluing points 65 and 66 to the front face 2 or else to engage in the slot 8 by its end 7.
  • the outer face 45 of the edge 31 of the bag head 17 is bonded to the inner face 55 of the upper edge 5 and the outer face 48 of the edge 32 is bonded to the upper face 56 of the front edge 18.
  • the nature of the adhesive and the gluing surface along the lines or surfaces 21 and 22 are chosen so that the edges 31 and 32 adhere strongly respectively to the upper edge 5 forming a cover and to the front edge 18 so that, when the package is opened shown in Figure 5a, during which the upper edge 5 is spaced in an opening direction, the heat sealing lines 20 give way, while the bonding lines or surfaces 21 and 22 continue to perform their function.
  • the package can then be opened as shown in FIGS. 5a to 5c by tearing off the glue dots 65 and 66.
  • the high adhesion between the external faces 45 and 48 of the edges 31 and 32 and respectively the internal face 55 of the cover 5 and the upper face 56 of the folded front edge 18 helps to prevent tearing of the head of the bag 17 when it is opened.
  • the presence of a possible separation primer in the junction zone 68 facilitates opening.
  • the region 21 is located at least partially opposite the zone 68, and it is possible, for example, to have 13 ⁇ 14.
  • the bag 10 When opening, the bag 10 lifts slightly, which facilitates the gripping of the products.
  • the package can be closed from the position shown in Figure 5c through the position shown in Figure 5b and to that shown in Figure 5a to return to the position shown in Figure 4d, in which case, in the example shown of a heat seal, the bag head 17 is closed by simply folding one over the other of its edges 31 and 32 whose internal faces 46 and 47 are kept applied against one another by the cover 5 which tends to close by itself, but which is preferably closed by cooperation between the end 7 of the tongue 6 and of the slot 8.
  • the lateral faces 3 of the box 1 advantageously have lateral edges 19 forming lateral flaps, articulated at 58, which allow, when the package is closed, to fold inwards the "picks" 34 and 35 thus authorize a reclosure in two stages, first by folding down the extensions 19 to fold back the "picks" 34 and 35 then, by folding down the upper edge 5, to ensure the closure as indicated above.
  • the extensions 19 may have a notched region 43 situated at their ends adjacent to the folded front edge 18.
  • an adhesive is chosen to make the bondings at 21 and 22, preferably requiring no temperature approaching the heat sealing temperature, so as to avoid that, during the operations performed in Figures 4c and 4d, the joining force of the edges 31 and 32 of the packet head 17 is not increased.
  • FIG. 1c shows for this purpose a set of two thermoweld jaws 101 and 102 having ridges 116 for the heat seal of the bag bottom 14, and ridges 120 and 121 for the heat seal of lines 20. A distance 15 is provided between the streaks 121 and the cutting tool 63, so as to release a non-heat-sealed region for bonding 21 and 22.
  • the internal faces 46 and 47 of the edges 31 and 32 of the bag head 17 can also be joined by cold bonding, for example using a pressure-sensitive adhesive.
  • FIG. 6 represents a variant of the invention, according to which the closing and opening device is attached to the bag head 17. It comprises a first rectangular element 85 made of cardboard which is glued to one face of the bag head 17 and a second rectangular cardboard element 88 which is glued to the other face of the bag head 17.
  • the element 85 is extended by a flap 86 folded over the edges of the bag head 17.
  • the flap 86 can be glued by points on the element 88.
  • a tongue 87 can be inserted into a slot 89 in the element 88.
  • FIG. 7 shows another variant of the invention, according to which the closing and opening device forms part of an external tubular packaging 90 surrounding the front faces 11a and rear 11b of the bag 10 and the bottom 14.
  • the device comprises a rectangular region 95 extending the rear face 93 of the tubular packaging 90 and a rectangular region 98 bonded to the other face of the bag head 17 and extending the front face 91 of the tubular packaging 90.
  • the region 95 is extended by a flap 96 folded over the edges of the bag head 17.
  • the flap 96 is glued by points on the region 98.
  • a tab (not shown) can be inserted into a slot in the region 98 or front panel 91.
  • FIG. 8a represents a preferred embodiment of the heat-sealing jaws making it possible, according to the preferred embodiment of the invention, to obtain a peelable surface heat-seal 200 (of the flesh-flesh type or "fine seal") remarkable in this sense that a low and reproducible peeling force can be obtained while ensuring a level of tightness of the sachet compatible with the conservation of products such as rusks or cookies, and this by allowing the use of standard films, for example a 26 ⁇ (or 32 ⁇ ) thick coated polypropylene film.
  • the metal jaws of heat sealing respectively upper 210 and lower 220 move in translation to bring them closer to one another, then by rotation about their respective axes 01 and 02 (in the direction of the arrows F1 and F2). They have smooth cylindrical regions 211 and 221 respectively which face each other and come to bear against each other during the passage of the bag head 17.
  • the jaws carry a cutting tool (212, 222).
  • the bottom of the bag is welded by another pair of jaws (not shown) which may be of a conventional type.
  • the cylindrical profiles 211 and 221 carry spacers, facing each other, namely 213 and 214 for the upper jaw of which they are a part, and 223 and 224 for the lower jaw in which they are incorporated.
  • the spacers 223 and 224 are for example PTFE parts housed in grooves of the lower jaw 220. The function of these spacers is to prevent that, when pressure is applied to the jaws for the press one against the other during the welding of the bag head, the irons do not come into contact against each other by their profiles 211 and 221. This gives better reproducibility of the head welding of bag.
  • the jaws are brought to a temperature which can be between 100 ° C. and 180 ° C., in particular between 120 ° C. and 140 ° C., the preferred value for a low rate (40 bps / min) being approximately 125 ° C. for a film. in standard type lacquered polypropylene, with an application pressure for example of the order of 2 to 8 bars, for example 4 bars. All other things being equal, the temperature of the jaws must be higher the higher the rate.
  • the movement of the jaws and the bags is controlled by stepping motors which allow fine control of the passage time and application of the jaws.
  • the jaws are applied at a reduced speed (which can even be canceled at a given instant), which is in particular made possible by the presence of the extra length represented by the region 17 ′ of the bag head 17 folded between the top of the products 42 and the flap 18.
  • the temperature actually reached by the film constituting the sachet is thus made closer to that of the jaws.
  • This force is compatible with the ergonomics of an opening by an average user.
  • this opening force is approximately two times less than the opening force which would be obtained from a conventional weld (striated) of the bag head, modified to give it a peelability, and in addition the reproducibility obtained is much higher.
  • the distance a (see fig. 8b) between the heat seal 200 and the bonding regions 21 and 22 is advantageously between 0 and 10 mm, the value 0 mm corresponding to the bonding regions 21 and 22 directly below the heat seal 200.
  • FIG. 8c represents a variant of FIG. 8b in which the end of the bag head 17 is glued at 21 to the flap 6 and at 22 to the front face 2, while the heat seal 200 is housed between the cover 5 and the flap 18.

Abstract

The sachet is contained in a box (1) to which it is fixed only by its top. The sachet top has two edges fixed together by their internal face with a first fixing force. The box cover (5) has a first region (21) fixed to the external face (45) of the first sachet edge (31) with a second fixing force. The box front face (2) has a region (22) fixed to the external face (48) of the second sachet edge (32), with a third fixing force. The second and third fixing forces are greater than the first fixing force. The box cover is extended by a flap (6) beyond the sachet top. In the closed position the flap is folded around the sachet top and its end (7) engaged in a slit (8) in the box front face. The front edge of the box front face is folded down in the direction of the cover and is covered by it in the closed position.

Description

La présente invention a pour objet un dispositif de fermeture et d'ouverture d'un emballage comportant un sachet présentant une tête de sachet dont les bords sont solidarisés l'un à l'autre.The present invention relates to a device for closing and opening a package comprising a bag having a bag head whose edges are secured to one another.

On connaît de l'Art Antérieur des paquets de biscottes comportant un ou plusieurs sachets ou pochons présentant une tête de sachet fermée par thermosoudure, la thermosoudure servant à assurer l'étanchéité du pochon, et qui sont emballés dans une boîte, formant un emballage extérieur, qui peut être ouverte par exemple en détachant une languette pré-découpée.Known from the prior art packets of rusks comprising one or more sachets or pouches having a sachet head closed by heat sealing, the heat sealing serving to seal the pouch, and which are packaged in a box, forming an outer packaging. , which can be opened for example by detaching a pre-cut tab.

De tels sachets ou pochons sont réalisés en continu à partir d'un film selon le procédé dit "flowpack", puis mis en boîte à l'aide d'une étuyeuse.Such sachets or pouches are produced continuously from a film according to the so-called "flowpack" process, then put in a box using a cartoner.

Avec ce type d'emballage, le consommateur ouvre tout d'abord la partie supérieure de la boîte et dégage ensuite un sachet qu'il lui est alors possible d'ouvrir. Or, on sait que l'ouverture d'un tel sachet présentant une tête thermosoudée, réalisé en général à partir d'un film de polypropylène de quelques dizaines de microns d'épaisseur, s'accompagne fréquemment d'une déchirure du sachet en raison du caractère "filant" du matériau qui le constitue de sorte que le contenu du paquet ou sachet risque de s'échapper et que le contenant lui-même, de fait de cette déchirure, ne peut pas être aisément refermé après une première ouverture. Dans le cas particulier des paquets de biscottes, le consommateur est susceptible de répandre hors du sachet des miettes ou des brisures de biscottes, ce qui constitue également un certain inconvénient pratique.With this type of packaging, the consumer first opens the upper part of the box and then releases a sachet which he can then open. However, it is known that the opening of such a bag having a heat-sealed head, generally produced from a polypropylene film of a few tens of microns thick, is frequently accompanied by a tearing of the bag due of the "threading" nature of the material which constitutes it, so that the contents of the packet or sachet risk escaping and the container itself, due to this tearing, cannot be easily closed again after a first opening. In the particular case of cracker packets, the consumer is likely to spread crumbs or broken crackers out of the bag, which also constitutes a certain practical drawback.

Le Brevet Européen EP-167 064 (NESTLE) a pour objet un emballage du type à refermeture comportant une enveloppe extérieure pourvue d'un volet et un sachet présentant une tête de sachet dont la base est pliée et pincée par le volet qui est rabattu pour la fermeture.The European Patent EP-167 064 (NESTLE) relates to a reclosing type packaging comprising an outer envelope provided with a flap and a bag having a bag head whose base is folded and pinched by the flap which is folded down to the closure.

Par contre, l'ouverture du sachet s'effectue soit en coupant la partie supérieure de la tête du sachet, soit en déchirant celle-ci à l'aide d'un organe de déchirage tel qu'un fil ou une bandelette.On the other hand, the opening of the sachet is carried out either by cutting the upper part of the head of the sachet, or by tearing the latter using a tearing member such as a wire or a strip.

Le Brevet britannique GB-2 032 393 (TOPPAN PRINTING Co.) a pour objet une boîte doublée par un sac qui n'est pas scellé à ses deux extrémités et qui est formé d'une bande repliée sur elle-même et soudée longitudinalement, cette soudure étant réalisée entre une face interne et une face externe. L'ouverture de l'emballage s'effectue par déchirage le long des lignes de pré-découpe qui délimitent le rabat et la portion du sac qui double le rabat. La boîte est ainsi ouverte pour dégager une région centrale, le sac restant maintenu dans la boîte par la partie restante du panneau supérieur de la boîte, de part et d'autre du rabat. Il est en pratique nécessaire de réaliser le sac en un matériau présentant une direction préférentielle de déchirement, faute de quoi on est tributaire des défauts inhérents au caractère "filant" des matériaux usuels.British Patent GB-2,032,393 (TOPPAN PRINTING Co.) relates to a box lined with a bag which is not sealed at its two ends and which is formed from a band folded over on itself and welded longitudinally, this welding being carried out between an internal face and an external face. The packaging is opened by tearing along the pre-cut lines which delimit the flap and the portion of the bag which doubles the flap. The box is thus opened to release a central region, the bag remaining held in the box by the remaining part of the upper panel of the box, on either side of the flap. It is in practice necessary to make the bag from a material having a preferential direction of tearing, failing which one is dependent on the defects inherent in the "stringing" nature of the usual materials.

Dans le cas des emballages selon les deux Brevets précités, l'ouverture de l'emballage reste tributaire :

  • soit d'une opération manuelle de découpage ;
  • soit d'un déchirage qui implique ou bien la pose d'un fil ou d'une bandelette de déchirage ou bien la réalisation de lignes de pré-découpe sur la boîte, d'où une déchirure du sachet dont les inconvénients ont été rappelés ci-dessus, en plus de la nécessité d'une étape de fabrication supplémentaire.
In the case of packaging according to the two aforementioned Patents, the opening of the packaging remains dependent on:
  • either a manual cutting operation;
  • either a tear which involves either the laying of a wire or a tear strip or the production of pre-cut lines on the box, resulting in a tear of the sachet, the drawbacks of which have been mentioned below above, in addition to the need for an additional manufacturing step.

La présente invention a pour objet un dispositif permettant d'assurer sans détérioration l'ouverture d'un sachet ayant une tête de sachet dont les bords internes sont solidarisés entre eux et qui ne nécessite ni opération manuelle de découpage, ni mise en oeuvre des moyens de pré-découpe spécifiques entraînant une déchirure du sachet.The present invention relates to a device for ensuring without deterioration the opening of a bag having a bag head whose internal edges are secured to each other and which requires neither manual cutting operation, nor setting uses specific pre-cutting means causing the bag to be torn.

Il est préféré que le dispositif permette en outre d'assurer une refermeture au moins partielle de celui-ci. Par refermeture au moins partielle, on entendra une fermeture du paquet qui peut ne pas être strictement étanche, mais qui permet cependant un stockage du produit pendant une durée correspondant à la consommation du contenu du sachet.It is preferred that the device also makes it possible to ensure at least partial reclosure thereof. By at least partial resealing, we mean a closure of the package which may not be strictly sealed, but which nevertheless allows storage of the product for a period corresponding to the consumption of the contents of the sachet.

L'invention concerne ainsi un dispositif de fermeture et d'ouverture d'un emballage comportant un sachet présentant une tête de sachet ayant un premier et un deuxième bord solidarisés l'un à l'autre par leur face interne avec une première force de solidarisation caractérisé en ce qu'il comporte un premier élément ayant une première région solidarisée à la face externe du premier bord avec une deuxième force de solidarisation, et un deuxième élément ayant une deuxième région solidarisée à la face externe du deuxième bord avec une troisième force de solidarisation, et en ce que la deuxième et la troisième force de solidarisation sont supérieures à la première force de solidarisation. Par force de solidarisation, on entendra au sens de la présente demande, la force maximale avec laquelle deux bords, ou un bord et un élément, adhèrent l'un à l'autre, force qu'il faut outre-passer pour obtenir une désolidarisation des bords, ou du bord et de l'élément correspondant.The invention thus relates to a device for closing and opening a package comprising a bag having a bag head having a first and a second edge secured to each other by their internal face with a first fastening force characterized in that it comprises a first element having a first region secured to the external face of the first edge with a second securing force, and a second element having a second region secured to the external face of the second edge with a third securing force joining, and in that the second and third joining forces are greater than the first joining force. By joining force, we mean within the meaning of this application, the maximum force with which two edges, or an edge and an element, adhere to each other, force that must be passed to obtain a separation edges, or the edge and the corresponding element.

Le premier élément peut avantageusement comporter un rabat qui le prolonge et qui s'étend au-delà de la tête de sachet, ledit rabat coopérant, en position de fermeture, avec le deuxième élément, par exemple par collage, et/ou par introduction d'une extrémité du rabat dans une fente du deuxième élément, le rabat étant replié autour de la tête du sachet.The first element may advantageously include a flap which extends it and which extends beyond the bag head, said flap cooperating, in the closed position, with the second element, for example by gluing, and / or by introduction of 'one end of the flap in a slot of the second element, the flap being folded around the head of the bag.

Dans le cas de sachets qui sont disposés à l'intérieur d'une boîte formant un emballage externe, le premier et/ou le deuxième éléments sont avantageusement respectivement un couvercle et/ou une face avant de la boîte qui contient le sachet.In the case of sachets which are arranged inside a box forming an external packaging, the first and / or the second elements are advantageously respectively a cover and / or a front face of the box which contains the sachet.

Il est particulièrement avantageux que le sachet soit solidaire de la boîte qui le contient uniquement au niveau de la tête de sachet. Ceci produit une remontée du sachet lors de l'ouverture de la boîte, qui facilite la préhension des produits.It is particularly advantageous for the bag to be secured to the box which contains it only at the level of the bag head. This produces a rise in the bag when the box is opened, which facilitates the gripping of the products.

La face avant de la boîte peut comporter un bord avant rabattu en direction du couvercle de la boîte, et qui est recouvert par celui-ci dans ladite position de fermeture.The front face of the box can have a front edge folded down towards the cover of the box, and which is covered by the latter in said closed position.

La tête de sachet peut comporter à ses extrémités longitudinales des bords latéraux rentrants ou "piochages".The sachet head may have re-entrant lateral edges or "picks" at its longitudinal ends.

Sous sa forme la plus générale, l'invention met en oeuvre une tête de sachet, dont les bords sont solidarisés avec ladite première force de solidarisation par toute technique connue.In its most general form, the invention uses a bag head, the edges of which are joined together with said first joining force by any known technique.

Selon une variante avantageuse, les faces latérales de la boîte comportent un premier et un deuxième bords latéraux rabattus qui sont recouverts par le couvercle de la boîte dans ladite position de fermeture, ce qui permet en particulier de rabattre les bords rentrants vers l'intérieur du paquet.According to an advantageous variant, the side faces of the box have first and second folded side edges which are covered by the cover of the box in said closed position, which in particular makes it possible to fold the re-entrant edges towards the inside of the box. package.

La tête de sachet peut être scellée à froid.The bag head can be cold sealed.

Elle peut présenter avantageusement au moins une, et de préférence deux, lignes de soudure par exemple de thermosoudure. Ceci permet d'obtenir une force de solidarisation peu élevée tout en assurant l'étanchéité du sachet. En variante, la tête de sachet comporte des stries pelables.It can advantageously have at least one, and preferably two, weld lines, for example of heat seal. This allows a low joining force to be obtained while ensuring the tightness of the sachet. Alternatively, the bag head has peelable streaks.

Selon un mode de réalisation préféré, la soudure de tête de sachet est une thermosoudure surfacique continue de type pelable, par exemple de contour rectangulaire, et dépourvue de stries. Elle présente avantageusement une force d'ouverture de l'ordre de 1N pour une longueur de l'ordre de 200 mm par exemple de 150 à 300 mm.According to a preferred embodiment, the seam head seal is a heat seal continuous surface of peelable type, for example of rectangular outline, and devoid of streaks. It advantageously has an opening force of the order of 1N for a length of the order of 200 mm, for example from 150 to 300 mm.

Le sachet peut comporter avantageusement une bande longitudinale de fermeture s'étendant sur la hauteur du sachet et présentant une zone de jonction avec un bord de la tête de sachet.The bag may advantageously include a longitudinal closure strip extending over the height of the bag and having a junction zone with an edge of the bag head.

La tête de sachet peut présenter, de préférence dans ladite zone de jonction, une portion localisée dans laquelle les faces internes du premier et du deuxième bord sont plus faiblement solidarisées l'une à l'autre de manière à former une amorce de désolidarisation.The sachet head may have, preferably in said junction zone, a localized portion in which the internal faces of the first and second edges are more loosely joined to one another so as to form a primer for separation.

La zone de jonction est disposée de préférence sur le deuxième bord de la tête de sachet.The junction zone is preferably arranged on the second edge of the bag head.

La première région du premier élément présente avantageusement une zone située en vis-à-vis de la zone de jonction.The first region of the first element advantageously has a zone located opposite the junction zone.

De manière à favoriser l'ouverture au droit de l'amorce de solidarisation, la première région du premier élément peut présenter une surface inférieure à celle de la deuxième région du deuxième élément, et/ou la première région du premier élément peut présenter une longueur, prise dans la direction longitudinale de la tête du sachet, qui est inférieure à celle du deuxième élément.In order to favor the opening to the right of the primer for securing, the first region of the first element may have a smaller surface than that of the second region of the second element, and / or the first region of the first element may have a length , taken in the longitudinal direction of the head of the bag, which is less than that of the second element.

L'invention concerne également un procédé de fabrication d'un emballage tel que défini ci-dessus caractérisé en ce qu'il comporte les étapes suivantes :

  • a) former des sachets individuels fermés aux deux extrémités et présentant une tête de sachet ayant un premier et un deuxième bords solidarisés l'un à l'autre par leurs faces internes avec une première force de solidarisation,
  • b) solidariser une première et une deuxième régions respectivement d'un premier et d'un deuxième élément à la face externe respectivement du premier et du deuxième bords, la première région pouvant se prolonger par un rabat coopérant, en position de fermeture, avec une région complémentaire du deuxième élément, ladite solidarisation s'effectuant de sorte que la première surface soit solidaire de la face externe du premier bord avec une deuxième force de solidarisation, que la deuxième surface soit solidaire de la face externe du deuxième bord avec une troisième force de solidarisation, et que la deuxième et la troisième forces de solidarisation soient supérieures à la première force de solidarisation.
The invention also relates to a method of manufacturing a package as defined above, characterized in that it comprises the following steps:
  • a) forming individual sachets closed at both ends and having a sachet head having first and second edges joined to one another by their internal faces with a first securing force,
  • b) securing first and second regions respectively of a first and a second element to the external face respectively of the first and second edges, the first region being able to be extended by a cooperating flap, in the closed position, with a complementary region of the second element, said securing taking place so that the first surface is secured to the external face of the first edge with a second securing force, that the second surface is secured to the external face of the second edge with a third force of joining, and that the second and third joining forces are greater than the first joining force.

L'étape a peut être précédée de l'étape préliminaire ao, à savoir :
   ao) former un tube d'ensachage continu défilant avec une vitesse de défilement donnée dans lequel des produits à ensacher sont disposés en des quantités données à des intervalles prédéterminés,Stage a can be preceded by preliminary stage a o , namely:
a o ) forming a continuous bagging tube running with a given running speed in which the products to be bagged are placed in given quantities at predetermined intervals,

Selon un mode de réalisation préféré, le procédé comporte, entre les étapes a et b, l'étape suivante :
   bo) introduire le sachet dans une boîte de manière que la tête de sachet soit adjacente au couvercle non replié de la boîte qui constitue le premier élément, la face avant de la boîte constituant le deuxième élément.According to a preferred embodiment, between the steps a and b, the following step:
b o ) introduce the sachet into a box so that the sachet head is adjacent to the non-folded cover of the box which constitutes the first element, the front face of the box constituting the second element.

Selon un mode préféré de mise en oeuvre, le procédé comporte, lors de l'étape a, une thermosoudure de la face interne des premier et deuxième bords, ladite thermosoudure étant réalisée de manière telle que la zone de jonction présente une région localisée dans laquelle les faces internes du premier et du deuxième bords sont plus faiblement solidarisées l'une à l'autre de manière à former une amorce de désolidarisation.According to a preferred embodiment, the method comprises, during step a, a heat seal of the internal face of the first and second edges, said heat seal being produced in such a way that the junction zone has a localized region in which the internal faces of the first and second edges are more weakly secured to one another so as to form a primer for separation.

Selon une variante préférée permettant notamment d'utiliser des films standards pour réaliser le sachet, la tête de sachet comporte une thermosoudure surfacique du type pelable et dépourvue de stries. En particulier, elle peut être réalisée entre 100°C et 180°C et notamment entre 125°C et 140°C, notamment pour un sachet en polypropylène laqué, par exemple d'épaisseur standard 26µ. Lors de la thermosoudure, la tête de sachet et les mors de thermosoudure sont de préférence animés d'un mouvement à vitesse réduite par rapport à ladite vitesse de déplacement, ledit mouvement pouvant comporter un point mort ou un quasi-point mort.According to a preferred variant making it possible in particular to use standard films for producing the sachet, the sachet head comprises a surface heat seal of the peelable type and devoid of streaks. In particular, it can be carried out between 100 ° C. and 180 ° C. and in particular between 125 ° C. and 140 ° C., in particular for a sack made of lacquered polypropylene, for example of standard thickness 26 μ. During the heat sealing, the bag head and the heat sealing jaws are preferably driven by a movement at reduced speed relative to said displacement speed, said movement possibly comprising a neutral point or a quasi-neutral point.

D'autres caractéristiques avantages de l'invention apparaîtront à la lecture de la description qui va suivre, donner à titre d'exemple non limitatif, en liaison avec les dessins dans lesquels :

  • les figures la à lc illustrent la réalisation en continu de sachets individuels propres à être mis en oeuvre selon l'invention, selon la technique de fabrication tubulaire dite "flowpack" ;
  • les figures 2a et 2b représentent un sachet individuel réalisé selon le procédé de la figure la, la figure 2b représentant à titre illustratif la tête du sachet en position ouverte ;
  • la figure 3 illustre les étapes de solidarisation du procédé selon l'invention ;
  • les figures 4a à 4d représentent un mode de réalisation préféré des étapes de procédé de la figure 3 ;
  • les figures 5a à 5c représentent un emballage selon un mode de réalisation préféré de l'invention respectivement en position de quasi-fermeture, de semi-ouverture et de pleine ouverture.
  • les figures 6 et 7 représentent deux autres variantes de l'invention.
  • et les fig. 8a à 8c représentent respectivement un mode de réalisation préféré de mors de thermosoudure selon l'invention et deux variantes de réalisation d'un dispositif selon l'invention.
Other advantageous characteristics of the invention will appear on reading the description which follows, to give by way of nonlimiting example, in conjunction with the drawings in which:
  • Figures la to lc illustrate the continuous production of individual sachets suitable for being implemented according to the invention, according to the tubular manufacturing technique called "flowpack";
  • Figures 2a and 2b show an individual bag made according to the method of Figure la, Figure 2b illustratively showing the head of the bag in the open position;
  • FIG. 3 illustrates the stages of joining the method according to the invention;
  • Figures 4a to 4d show a preferred embodiment of the process steps of Figure 3;
  • Figures 5a to 5c show a package according to a preferred embodiment of the invention respectively in the quasi-closed, semi-open and full open position.
  • Figures 6 and 7 show two other variants of the invention.
  • and fig. 8a to 8c respectively represent a preferred embodiment of the heat-sealing jaws according to the invention and two alternative embodiments of a device according to the invention.

Selon la figure la, des produits 51 à emballer, tels que des biscottes, sont disposés à intervalles, réguliers ou non, à l'intérieur d'un tube ou d'une bobine 50 de film et les paquets ou sachets sont fermés par toute technique connue, par exemple par soudure à froid ou par thermosoudure. On notera que la soudure à froid permet d'obtenir de bons résultats quant à la pelabilité, mais elle présente par contre l'inconvénient de nécessiter l'emploi de films spéciaux relativement coûteux. Une installation de soudure 52 comporte des fers de soudure 61 et 62 qui peuvent être par exemple des fers de thermosoudure, les différents paquets ou sachets 10 étant séparés par un dispositif de découpe 63 situé entre les fers 61 et 62. Le fer 61 permet de réaliser une ou plusieurs lignes de thermosoudure 20 (voir figure 2a) sur la tête 17 du paquet qui présente un pli de hauteur 1₁ plus importante que la hauteur 1₂ du fond 16 du sachet ou paquet 10. Les lignes de thermosoudure 20 disposées dans le sens longitudinal de la tête de sachet 17 permettent d'assurer l'étanchéité de celle-ci tout en permettant son ouverture sans déchirure ainsi qu'il sera montré plus loin dans la description. Le fer 62 qui sert à réaliser la thermosoudure du fond de sachet 16 peut comporter de manière classique des stries disposées dans le sens de la hauteur du paquet, c'est-à-dire perpendiculaires aux lignes longitudinales 20, de manière à réaliser une thermosoudure classique. A titre de variante, la tête du sachet 17 peut également présenter des stries disposées dans le sens de la hauteur du paquet, comme celles du fond du sachet 16, mais dans ce cas, il est préférable de porter le fer 61 à une température inférieure à celle qui serait nécessaire pour réaliser une véritable thermosoudure, de telle sorte que l'adhésion entre les faces internes 46 et 47 des bords 31 et 32 de la tête 17 du sachet soit relativement faible et que ceux-ci puissent être aisément séparés sans déchirure de la tête du sachet 17. On considère que pour obtenir une véritable thermosoudure, le matériau doit être effectivement porté à une température comprise entre 140°C et 150°C, ce qui correspond à une température des fers de thermosoudure qui est de l'ordre de 180°C à 200°C, alors que si le matériau est seulement porté à une température comprise entre 80°C et 140°C, on obtient une adhésion moins bonne caractérisée par sa pelabilité, mais qui bien que non rigoureusement étanche (soudure de type "chair sur chair" ou "fin seal"), assure une bonne conservation des produits.According to FIG. 1 a, products 51 to be packaged, such as rusks, are placed at intervals, regular or not, inside a tube or a reel 50 of film and the packages or sachets are closed by any known technique, for example by cold welding or by heat sealing. It will be noted that cold welding allows good results to be obtained as regards peelability, but it does have the disadvantage of requiring the use of relatively expensive special films. A soldering installation 52 comprises soldering irons 61 and 62 which may, for example, be heat-sealing irons, the various packages or bags 10 being separated by a cutting device 63 located between the irons 61 and 62. The iron 61 makes it possible to make one or more heat seal lines 20 (see Figure 2a) on the head 17 of the package which has a fold of height 1₁ greater than the height 1₂ of the bottom 16 of the sachet or package 10. The heat seal lines 20 arranged in the direction longitudinal of the bag head 17 ensure the sealing thereof while allowing its opening without tearing as will be shown later in the description. The iron 62 which is used to heat seal the bottom of the bag 16 may conventionally include ridges arranged in the height direction of the packet, that is to say perpendicular to the longitudinal lines 20, so as to produce a heat seal classic. Alternatively, the head of the bag 17 may also have ridges arranged in the height direction of the package, like those of the bottom of the bag 16, but in this case, it is preferable to bring the iron 61 to a lower temperature. to the one who would be necessary to achieve a real heat seal, so that the adhesion between the internal faces 46 and 47 of the edges 31 and 32 of the head 17 of the bag is relatively weak and that these can be easily separated without tearing the head of the bag 17. It is considered that to obtain a real heat seal, the material must be effectively brought to a temperature between 140 ° C and 150 ° C, which corresponds to a temperature of the heat seal irons which is of the order of 180 ° C to 200 ° C, whereas if the material is only brought to a temperature between 80 ° C and 140 ° C, we obtain a less good adhesion characterized by its peelability, but which although not strictly waterproof (type welding "flesh on flesh" or "fine seal"), ensures good preservation of the products.

Selon les figures 2a et 2b, un sachet 10 contient deux rangées 41 et 42 superposées de biscottes, les faces avant 11a et arrière 11b du paquet 10 se raccordant à la tête du sachet 17 par une région arrondie 15. Le repère 12 désigne les faces latérales du sachet 10. La figure 2b représente la tête du sachet 17 dans une position ouverte hypothétique. On y voit les deux bords 31 et 32 de la tête de sachet 17 ainsi que les bords latéraux rentrants 34 et 35 qui peuvent y être ménagés et qui forment des "piochages" également thermosoudés lors du scellement du sachet 10 par les lignes de thermosoudure 20 de la figure 2a. La face avant lla du sachet 10 présente sur toute sa hauteur une soudure longitudinale 67, réalisée à plat, ou dans un repli de matière. La soudure 67 se raccorde en 68 aux lignes thermosoudées 20, ces lignes 20 étant de préférence réalisées à une température telle que, du fait de la surépaisseur, l'adhésion soit plus faible en 68 que dans le reste des lignes 20, de manière à produire une amorce de désolidarisation en facilitant l'ouverture du sachet 10.According to FIGS. 2a and 2b, a sachet 10 contains two rows 41 and 42 superimposed of rusks, the front 11a and rear 11b faces of the package 10 connecting to the head of the sachet 17 by a rounded region 15. The reference 12 designates the faces side of the bag 10. Figure 2b shows the head of the bag 17 in a hypothetical open position. We can see the two edges 31 and 32 of the bag head 17 as well as the re-entrant side edges 34 and 35 which can be formed therein and which form "picks" also heat-sealed during the sealing of the bag 10 by the heat-sealing lines 20 of Figure 2a. The front face lla of the bag 10 has over its entire height a longitudinal weld 67, made flat, or in a fold of material. The weld 67 is connected at 68 to the heat-sealed lines 20, these lines 20 preferably being produced at a temperature such that, due to the extra thickness, the adhesion is weaker at 68 than in the rest of the lines 20, so as to produce a primer separation by facilitating the opening of the bag 10.

La figure 3 représente une étuyeuse 70 à plat dans laquelle les sachets 10 sont introduits en vue de leur emboîtage dans une boîte en carton 1. L'étuyeuse 70 permet de fermer le fond 4 de la boîte préalablement dépliée à partir d'une boîte aplatie, tout en maintenant aligné avec la face arrière 9, le bord supérieur ou couvercle 5 qui est articulé en 38 à la face arrière 9 et en 39 à une languette 6, destinée à s'introduire, par exemple par une extrémité moins large 7 dans une fente 8, et en maintenant aligné avec la face avant 2, un prolongement 18 articulé en 44 à la face avant 2. Le prolongement 18 forme un bord avant rabattable.FIG. 3 shows a cartoner 70 flat in which the sachets 10 are introduced with a view to fitting them into a cardboard box 1. The cartoner 70 makes it possible to close the bottom 4 of the box previously unfolded from a flattened box , while maintaining aligned with the rear face 9, the upper edge or cover 5 which is articulated at 38 to the rear face 9 and at 39 to a tongue 6, intended to be introduced, for example by a narrower end 7 into a slot 8, and while maintaining aligned with the front face 2, an extension 18 articulated at 44 to the front face 2. The extension 18 forms a folding front edge.

Le paquet 1 qui sort à plat de l'étuyeuse 70 est placé en position verticale dans le dispositif 80 qui permet de réaliser la fermeture du bord supérieur 5 conformément aux étapes représentées aux figures 4a à 4d. A la figure 4a, la boîte 1 est en position verticale, ce qui permet de donner une position de référence au sachet 10 dont le fond 14 repose sur le fond 4 de la boîte 1, et le bord supérieur 5 ainsi que le rabat 6 sont placés dans l'alignement de la face arrière 9. Le bord 18 articulé en 44 est placé dans le prolongement de la face avant 2. La tête du sachet 17 est au départ en position verticale.The package 1 which comes out flat from the cartoner 70 is placed in a vertical position in the device 80 which makes it possible to close the upper edge 5 in accordance with the steps shown in FIGS. 4a to 4d. In FIG. 4a, the box 1 is in a vertical position, which makes it possible to give a reference position to the bag 10, the bottom 14 of which rests on the bottom 4 of the box 1, and the upper edge 5 and the flap 6 are placed in alignment with the rear face 9. The edge 18 articulated at 44 is placed in the extension of the front face 2. The head of the bag 17 is initially in the vertical position.

Dans un premier temps, on replie vers l'intérieur du paquet le prolongement 18 pour former un bord avant et on dépose, par exemple par projection, sur sa face externe 56 une ligne ou surface de collage 22 de longueur 1₄ qui s'étend au moins sur une partie de sa longueur. La tête du sachet 17 est repliée vers la ligne ou la surface de colle 22 (figure 4b) puis, le bord supérieur 5 qui présente sur sa face interne 55 une ligne ou une surface de colle 21 de longueur 1₃ préalablement déposée, par exemple par projection, est également rabattu vers la tête du sachet 17 (figure 4c), alors que le rabat 6 est replié (figure 4d) autour de son articulation 39 pour être collé par des points de collage 65 et 66 à la face avant 2 ou bien pour s'engager dans la fente 8 par son extrémité 7. De la sorte, la face 45 externe du bord 31 de la tête de sachet 17 est collée à la face interne 55 du bord supérieur 5 et la face externe 48 du bord 32 est collée sur la face supérieure 56 du bord avant 18. La nature de la colle et la surface d'encollage selon les lignes ou les surfaces 21 et 22 sont choisies de manière que les bords 31 et 32 adhèrent fortement respectivement au bord supérieur 5 formant un couvercle et au bord avant 18 de telle sorte que, lors d'une ouverture du paquet représentée à la figure 5a, au cours de laquelle le bord supérieur 5 est écarté dans une direction d'ouverture, les lignes 20 de thermosoudure cèdent, alors que les lignes ou surfaces de collage 21 et 22 continuent d'assurer leur fonction.Firstly, the extension 18 is folded inwardly of the package to form a front edge and a bonding line or surface 22 of length 1₄ which extends to the center is deposited, for example by projection, on its external face 56. less over part of its length. The head of the bag 17 is folded towards the line or the adhesive surface 22 (FIG. 4b) then, the upper edge 5 which has on its internal face 55 a line or an adhesive surface 21 of length 1₃ previously deposited, for example by projection, is also folded back towards the head of the bag 17 (FIG. 4c), while the flap 6 is folded (FIG. 4d) around its articulation 39 to be glued by gluing points 65 and 66 to the front face 2 or else to engage in the slot 8 by its end 7. In this way, the outer face 45 of the edge 31 of the bag head 17 is bonded to the inner face 55 of the upper edge 5 and the outer face 48 of the edge 32 is bonded to the upper face 56 of the front edge 18. The nature of the adhesive and the gluing surface along the lines or surfaces 21 and 22 are chosen so that the edges 31 and 32 adhere strongly respectively to the upper edge 5 forming a cover and to the front edge 18 so that, when the package is opened shown in Figure 5a, during which the upper edge 5 is spaced in an opening direction, the heat sealing lines 20 give way, while the bonding lines or surfaces 21 and 22 continue to perform their function.

Le paquet peut alors être ouvert comme représenté aux figures 5a à 5c par arrachage des points de colle 65 et 66. On remarquera que l'adhésion élevée entre les faces externes 45 et 48 des bords 31 et 32 et respectivement la face interne 55 du couvercle 5 et la face supérieure 56 du bord avant replié 18 contribue à éviter les déchirures de la tête du sachet 17 lors de son ouverture.The package can then be opened as shown in FIGS. 5a to 5c by tearing off the glue dots 65 and 66. It will be noted that the high adhesion between the external faces 45 and 48 of the edges 31 and 32 and respectively the internal face 55 of the cover 5 and the upper face 56 of the folded front edge 18 helps to prevent tearing of the head of the bag 17 when it is opened.

La présence d'une éventuelle amorce de désolidarisation dans la zone de jonction 68 facilite l'ouverture. A cet effet, la région 21 est située au moins en partie en vis-à-vis de la zone 68, et on peut par exemple avoir 1₃ < 1₄.The presence of a possible separation primer in the junction zone 68 facilitates opening. To this end, the region 21 is located at least partially opposite the zone 68, and it is possible, for example, to have 1₃ <1₄.

Lors de l'ouverture, le sachet 10 se soulève légèrement, ce qui facilite la préhension des produits.When opening, the bag 10 lifts slightly, which facilitates the gripping of the products.

Le paquet peut être refermé à partir de la position représentée à la figure 5c en passant par la position représentée à la figure 5b et à celle représentée à la figure 5a pour revenir à la position représentée à la figure 4d, auquel cas, dans l'exemple représenté d' une thermosoudure, la tête de sachet 17 est refermée par simple repli l'un sur l'autre de ses bords 31 et 32 dont les faces internes 46 et 47 sont maintenues appliquées l'une contre l'autre par le couvercle 5 qui tend à se refermer de lui-même, mais qui est de préférence fermé par coopération entre l'extrémité 7 de la languette 6 et de la fente 8.The package can be closed from the position shown in Figure 5c through the position shown in Figure 5b and to that shown in Figure 5a to return to the position shown in Figure 4d, in which case, in the example shown of a heat seal, the bag head 17 is closed by simply folding one over the other of its edges 31 and 32 whose internal faces 46 and 47 are kept applied against one another by the cover 5 which tends to close by itself, but which is preferably closed by cooperation between the end 7 of the tongue 6 and of the slot 8.

Les faces latérales 3 de la boîte 1 présentent avantageusement des bords latéraux 19 formant des rabats latéraux, articulés en 58, qui permettent, lors de la refermeture du paquet, de replier vers l'intérieur les "piochages" 34 et 35 autorisent ainsi une refermeture en deux temps, tout d'abord en rabattant les prolongements 19 pour replier les "piochages" 34 et 35 puis, en rabattant le bord supérieur 5, pour assurer la fermeture comme indiqué précédemment. On remarquera que les prolongements 19 peuvent présenter une région échancrée 43 située à leurs extrémités adjacentes au bord avant replié 18.The lateral faces 3 of the box 1 advantageously have lateral edges 19 forming lateral flaps, articulated at 58, which allow, when the package is closed, to fold inwards the "picks" 34 and 35 thus authorize a reclosure in two stages, first by folding down the extensions 19 to fold back the "picks" 34 and 35 then, by folding down the upper edge 5, to ensure the closure as indicated above. It will be noted that the extensions 19 may have a notched region 43 situated at their ends adjacent to the folded front edge 18.

Dans le cas où la tête du sachet 17 est fermée par thermosoudure, on choisit pour réaliser les collages en 21 et 22 une colle ne nécessitant de préférence pas de température s'approchant de la température de thermosoudure, de manière à éviter que, lors des opérations réalisées aux figures 4c et 4d, la force de solidarisation des bords 31 et 32 de la tête de paquet 17 ne soit augmentée.In the case where the head of the bag 17 is closed by heat sealing, an adhesive is chosen to make the bondings at 21 and 22, preferably requiring no temperature approaching the heat sealing temperature, so as to avoid that, during the operations performed in Figures 4c and 4d, the joining force of the edges 31 and 32 of the packet head 17 is not increased.

Il est cependant possible d'utiliser pour réaliser les collages en 21 et 22, une colle nécessitant une température élevée, telle qu'une température voisine de ou supérieure à la température de thermosoudure, à condition que ce collage s'effectue dans une région suffisamment espacée de la région thermosoudée, ce collage s'effectuant éventuellement dans une région de la tête de sachet 17 qui est dépourvue d'un revêtement intérieur thermosoudable. La figure lc représente à cet effet un ensemble de deux mors de thermosoudure 101 et 102 présentant des stries 116 pour la thermosoudure du fond de sachet 14, et des stries 120 et 121 pour la thermosoudure des lignes 20. Une distance 1₅ est prévue entre les stries 121 et l'outil de coupe 63, de manière à dégager une région non thermosoudée pour réaliser les collages 21 et 22.However, it is possible to use, for bonding at 21 and 22, an adhesive requiring a high temperature, such as a temperature close to or higher than the heat-sealing temperature, provided that this bonding is carried out in a region which is sufficiently spaced from the heat-sealed region, this bonding possibly taking place in a region of the bag head 17 which is devoid of a coating heat-sealed interior. FIG. 1c shows for this purpose a set of two thermoweld jaws 101 and 102 having ridges 116 for the heat seal of the bag bottom 14, and ridges 120 and 121 for the heat seal of lines 20. A distance 1₅ is provided between the streaks 121 and the cutting tool 63, so as to release a non-heat-sealed region for bonding 21 and 22.

On notera que l'application de température à la tête de sachet 17, pour réaliser les collages en 21 et 22, peut s'effectuer en introduisant un élément chauffant plat entre les extrémités des bords 31 et 32.It will be noted that the application of temperature to the head of the bag 17, in order to make the bondings at 21 and 22, can be carried out by introducing a flat heating element between the ends of the edges 31 and 32.

Les faces internes 46 et 47 des bords 31 et 32 de la tête de sachet 17 peuvent être également solidarisées par collage à froid, par exemple à l'aide d'un adhésif sensible à la pression.The internal faces 46 and 47 of the edges 31 and 32 of the bag head 17 can also be joined by cold bonding, for example using a pressure-sensitive adhesive.

La figure 6 représente une variante de l'invention, selon laquelle le dispositif de fermeture et d'ouverture est rapporté sur la tête de sachet 17. Il comporte un premier élément rectangulaire 85 en carton qui est collé sur une face de la tête de sachet 17 et un deuxième élément rectangulaire 88 en carton qui est collé sur l'autre face de la tête de sachet 17. L'élément 85 se prolonge par un rabat 86 replié par dessus les bords de la tête de sachet 17. Le rabat 86 peut être collé par points sur l'élément 88. Une languette 87 peut être introduite dans une fente 89 de l'élément 88.FIG. 6 represents a variant of the invention, according to which the closing and opening device is attached to the bag head 17. It comprises a first rectangular element 85 made of cardboard which is glued to one face of the bag head 17 and a second rectangular cardboard element 88 which is glued to the other face of the bag head 17. The element 85 is extended by a flap 86 folded over the edges of the bag head 17. The flap 86 can be glued by points on the element 88. A tongue 87 can be inserted into a slot 89 in the element 88.

La figure 7 représente une autre variante de l'invention, selon laquelle le dispositif de fermeture et d'ouverture fait partie d'un emballage tubulaire externe 90 entourant les faces avant lla et arrière llb du sachet 10 et le fond 14. Le dispositif comporte une région rectangulaire 95 prolongeant la face arrière 93 de l'emballage tubulaire 90 et une région rectangulaire 98 collée sur l'autre face de la tête de sachet 17 et prolongeant la face avant 91 de l'emballage tubulaire 90. La région 95 se prolonge par un rabat 96 replié par dessus les bords de la tête de sachet 17. Le rabat 96 est collé par points sur la région 98. Une languette (non représentée) peut être introduite dans une fente de la région 98 ou de la face avant 91.FIG. 7 shows another variant of the invention, according to which the closing and opening device forms part of an external tubular packaging 90 surrounding the front faces 11a and rear 11b of the bag 10 and the bottom 14. The device comprises a rectangular region 95 extending the rear face 93 of the tubular packaging 90 and a rectangular region 98 bonded to the other face of the bag head 17 and extending the front face 91 of the tubular packaging 90. The region 95 is extended by a flap 96 folded over the edges of the bag head 17. The flap 96 is glued by points on the region 98. A tab (not shown) can be inserted into a slot in the region 98 or front panel 91.

La figure 8a représente un mode de réalisation préféré des mors de thermosoudure permettant, selon la variante préférée de réalisation de l'invention, d'obtenir une thermosoudure surfacique pelable 200 (du type chair-chair ou "fin seal") remarquable en ce sens qu'une force d'arrachage faible et reproductible peut être obtenue tout en assurant un niveau d'étanchéité du sachet compatible avec la conservation de produits tels que les biscottes ou les biscuits, et ce en permettant l'emploi de films standards, par exemple un film de polypropylène laqué d'épaisseur 26µ (ou 32µ).FIG. 8a represents a preferred embodiment of the heat-sealing jaws making it possible, according to the preferred embodiment of the invention, to obtain a peelable surface heat-seal 200 (of the flesh-flesh type or "fine seal") remarkable in this sense that a low and reproducible peeling force can be obtained while ensuring a level of tightness of the sachet compatible with the conservation of products such as rusks or cookies, and this by allowing the use of standard films, for example a 26µ (or 32µ) thick coated polypropylene film.

Les mors métalliques de thermosoudure, respectivement supérieur 210 et inférieur 220 se déplacent en translation pour les rapprocher l'un de l'autre, puis par rotation autour de leurs axes respectifs 0₁ et 0₂ (dans le sens des flèches F₁ et F₂). Ils présentent des régions cylindriques lisses respectivement 211 et 221 qui se font face et viennent s'appliquer l'une contre l'autre lors du passage de la tête de sachet 17. Les mors portent un outil de coupe (212, 222). La soudure de fond de sachet est réalisée par une autre paire de mors (non représentés) qui peuvent être d'un type conventionnel.The metal jaws of heat sealing, respectively upper 210 and lower 220 move in translation to bring them closer to one another, then by rotation about their respective axes 0₁ and 0₂ (in the direction of the arrows F₁ and F₂). They have smooth cylindrical regions 211 and 221 respectively which face each other and come to bear against each other during the passage of the bag head 17. The jaws carry a cutting tool (212, 222). The bottom of the bag is welded by another pair of jaws (not shown) which may be of a conventional type.

Les profils cylindriques 211 et 221 portent des entretoises, se faisant face, à savoir 213 et 214 pour le mors supérieur dont elles font partie, et 223 et 224 pour le mors inférieur auquel elles sont incorporées. Les entretoises 223 et 224 sont par exemple des pièces en PTFE logées dans des rainures du mors inférieur 220. La fonction de ces entretoises est d'empêcher que, lorsqu'une pression est appliquée aux mors pour les appuyer l'un contre l'autre lors de la soudure de la tête de sachet, les fers ne viennent en contact l'un contre l'autre par leurs profils 211 et 221. On obtient ainsi une meilleure reproductibilité de la soudure de tête de sachet.The cylindrical profiles 211 and 221 carry spacers, facing each other, namely 213 and 214 for the upper jaw of which they are a part, and 223 and 224 for the lower jaw in which they are incorporated. The spacers 223 and 224 are for example PTFE parts housed in grooves of the lower jaw 220. The function of these spacers is to prevent that, when pressure is applied to the jaws for the press one against the other during the welding of the bag head, the irons do not come into contact against each other by their profiles 211 and 221. This gives better reproducibility of the head welding of bag.

Les mors sont portés à une température qui peut être comprise entre 100°C et 180°C, notamment entre 120°C et 140°C, la valeur préférée pour une cadence faible (40cps/mn) étant environ 125°C pour un film en polypropylène laqué de type standard, avec une pression d'application par exemple de l'ordre de 2 à 8 bars, par exemple 4 bars. Toutes choses égales par ailleurs, la température des mors doit être d'autant plus élevée que la cadence est élevée.The jaws are brought to a temperature which can be between 100 ° C. and 180 ° C., in particular between 120 ° C. and 140 ° C., the preferred value for a low rate (40 bps / min) being approximately 125 ° C. for a film. in standard type lacquered polypropylene, with an application pressure for example of the order of 2 to 8 bars, for example 4 bars. All other things being equal, the temperature of the jaws must be higher the higher the rate.

Le contrôle du déplacement des mors et des sachets est effectué par des moteurs pas à pas qui permettent un contrôle fin du temps de passage et d'application des mors. En particulier l'application des mors s'effectue à vitesse réduite (pouvant même s'annuler à un instant donné), ce qui est en particulier rendu possible par la présence de la surlongueur que représente la région 17' de la tête de sachet 17 repliée entre le somment des produits 42 et le rabat 18.The movement of the jaws and the bags is controlled by stepping motors which allow fine control of the passage time and application of the jaws. In particular, the jaws are applied at a reduced speed (which can even be canceled at a given instant), which is in particular made possible by the presence of the extra length represented by the region 17 ′ of the bag head 17 folded between the top of the products 42 and the flap 18.

La température effectivement atteinte par le film constituant le sachet est ainsi rendue plus proche de celle des mors.The temperature actually reached by the film constituting the sachet is thus made closer to that of the jaws.

On obtient ainsi une tête de sachet dont la force d'ouverture par action sur le couvercle 5 est de l'ordre de 1N avec une thermosoudure 200 de hauteur h = 4 à 6mm, et pour un sachet tel qu'un sachet de biscottes dont la longueur, c'est-à-dire la dimension prise dans le sens longitudinal de la tête de sachet, est de l'ordre de 150 à 300 mm, par exemple 250 mm, tout en conservant une étanchéité compatible avec la conservation des produits. Cette force est compatible avec l'ergonomie d'une ouverture par un utilisateur moyen.A bag head is thus obtained whose opening force by action on the cover 5 is of the order of 1N with a heat seal 200 of height h = 4 to 6mm, and for a bag such as a bag of crackers, the length, that is to say the dimension taken in the longitudinal direction of the bag head, is of the order of 150 to 300 mm, for example 250 mm, while retaining a seal compatible with the preservation of the products . This force is compatible with the ergonomics of an opening by an average user.

Toutes choses égales par ailleurs, cette force d'ouverture est à peu près deux fois inférieure à la force d'ouverture qui serait obtenue à partir d'une soudure classique (striée) de la tête de sachet, modifiée pour lui conférer une pelabilité, et en outre la reproductibilité obtenue est nettement supérieure.All other things being equal, this opening force is approximately two times less than the opening force which would be obtained from a conventional weld (striated) of the bag head, modified to give it a peelability, and in addition the reproducibility obtained is much higher.

La distance a (voir fig.8b) entre la thermosoudure 200 et les régions de collage 21 et 22 est avantageusement comprise entre 0 et 10 mm, la valeur 0 mm correspondant à des régions de collage 21 et 22 à l'aplomb de la thermosoudure 200.The distance a (see fig. 8b) between the heat seal 200 and the bonding regions 21 and 22 is advantageously between 0 and 10 mm, the value 0 mm corresponding to the bonding regions 21 and 22 directly below the heat seal 200.

La figure 8c représente une variante de la figure 8b dans laquelle l'extrémité de la tête de sachet 17 est collée en 21 au rabat 6 et en 22 à la face avant 2, alors que la thermosoudure 200 est logée entre le couvercle 5 et le rabat 18.FIG. 8c represents a variant of FIG. 8b in which the end of the bag head 17 is glued at 21 to the flap 6 and at 22 to the front face 2, while the heat seal 200 is housed between the cover 5 and the flap 18.

Claims (24)

Dispositif de fermeture et d'ouverture d'un emballage comportant un sachet présentant une tête de sachet ayant un premier et un deuxième bords solidarisés l'un à l'autre par leur face interne avec une première force de solidarisation caractérisé en ce qu'il comporte un premier élément (5) ayant une première région (21) solidarisée à la face externe (45) du premier bord (31) avec une deuxième force de solidarisation, et un deuxième élément (2, 18) ayant une deuxième région (22) solidarisée à la face externe (48) du deuxième bord (32), avec une troisième force de solidarisation et en ce que la deuxième et la troisième force de solidarisation sont supérieures à la première force de solidarisation..Device for closing and opening a packaging comprising a sachet having a sachet head having first and second edges secured to each other by their internal face with a first securing force characterized in that it comprises a first element (5) having a first region (21) secured to the external face (45) of the first edge (31) with a second securing force, and a second element (2, 18) having a second region (22 ) secured to the outer face (48) of the second edge (32), with a third joining force and in that the second and third joining forces are greater than the first joining force. Dispositif selon la revendication 1, caractérisé en ce que le premier élément (5) comporte un rabat (6) qui le prolonge, et qui s'étend au-delà de la tête de sachet, ledit rabat (6) coopérant en position de fermeture avec le deuxième élément (2, 18) par repli du rabat (6) autour de la tête de sachet.Device according to claim 1, characterized in that the first element (5) has a flap (6) which extends it, and which extends beyond the bag head, said flap (6) cooperating in the closed position with the second element (2, 18) by folding the flap (6) around the bag head. Dispositif selon la revendication 2, caractérisé en ce que le deuxième élément comporte une fente (8) dans laquelle s'engage l'extrémité (7) du rabat.Device according to claim 2, characterized in that the second element comprises a slot (8) in which the end (7) of the flap engages. Dispositif selon une des revendications 1 à 3, caractérisé en ce que le premier élément est un couvercle (5) d'une boîte (1) contenant le sachet (10).Device according to one of claims 1 to 3, characterized in that the first element is a cover (5) of a box (1) containing the sachet (10). Dispositif selon une des revendications 1 à 4, caractérisé en ce que le deuxième élément est une face avant (2, 18) d'une boîte (1) contenant le sachet (10).Device according to one of claims 1 to 4, characterized in that the second element is a front face (2, 18) of a box (1) containing the bag (10). Dispositif selon la revendication 5, caractérisé en ce que le deuxième élément est un bord avant (18) de la face avant (2, 18), ledit bord avant (18) étant rabattu en direction du couvercle (5) et étant recouvert par celui-ci (5) dans ladite position de fermeture.Device according to claim 5, characterized in that the second element is a front edge (18) of the front face (2, 18), said front edge (18) being folded down towards the cover (5) and being covered by that -ci (5) in said closed position. Dispositif selon une des revendications 4 à 6, caractérisé en ce que le sachet est solidarisé à la boîte uniquement au niveau de la tête de sachet.Device according to one of claims 4 to 6, characterized in that the sachet is secured to the box only at the level of the sachet head. Dispositif selon une des revendications 4 à 7, caractérisé en ce que la tête du sachet (17) comporte, à ses extrémités longitudinales, des bords latéraux rentrants (34, 35).Device according to one of Claims 4 to 7, characterized in that the head of the bag (17) has, at its longitudinal ends, re-entrant lateral edges (34, 35). Dispositif selon une des revendications 4 à 8, caractérisé en ce que les faces latérales de la boîte (1) comportent un premier et un deuxième bords latéraux (19) rabattus qui sont recouverts par le couvercle (5) de la boîte (1) dans ladite position de fermeture.Device according to one of Claims 4 to 8, characterized in that the lateral faces of the box (1) have first and second folded side edges (19) which are covered by the cover (5) of the box (1) in said closed position. Dispositif selon une des revendications précédentes caractérisé en ce que la tête du sachet (17) présente au moins une ligne de soudure (20) ou bien des stries pelables ou bien une surface continue pelable.Device according to one of the preceding claims, characterized in that the head of the bag (17) has at least one weld line (20) or else peelable striations or else a continuous peelable surface. Dispositif selon une des revendications précédentes, caractérisé en ce que le sachet comporte une bande longitudinale (67) de fermeture s'étendant sur la hauteur du sachet et présentant une zone de jonction (68) avec un bord de la tête de sachet (17).Device according to one of the preceding claims, characterized in that the bag has a longitudinal closure strip (67) extending over the height of the bag and having a junction zone (68) with an edge of the bag head (17) . Dispositif selon la revendication 11, caractérisé en ce que la tête de sachet (17) présente une portion localisée (68) dans laquelle les faces internes (46, 47) du premier (31) et du deuxième (32) bord sont plus faiblement solidarisées l'une à l'autre de manière à former une amorce de désolidarisation.Device according to claim 11, characterized in that the bag head (17) has a localized portion (68) in which the internal faces (46, 47) of the first (31) and the second (32) edge are more loosely secured to each other so as to form a starting point for separation. Dispositif selon la revendication 12, caractérisé en ce que la portion localisée est disposée dans ladite zone de jonction (68).Device according to claim 12, characterized in that the localized portion is arranged in said junction zone (68). Dispositif selon une des revendications 11 à 13, caractérisé en ce que la zone de jonction (68) est disposée sur le deuxième bord (32) de la tête de sachet (17).Device according to one of claims 11 to 13, characterized in that the junction zone (68) is arranged on the second edge (32) of the bag head (17). Dispositif selon une des revendications 11 à 14, caractérisé en ce que la première région (21) du premier élément (5) présente une zone située en vis-à-vis de ladite zone de jonction (68).Device according to one of claims 11 to 14, characterized in that the first region (21) of the first element (5) has a zone located opposite said junction zone (68). Dispositif selon la revendication 15, caractérisé en ce que la première région (21) du premier élément (5) présente une surface inférieure à celle de la deuxième région (22) du deuxième élément (2, 18).Device according to claim 15, characterized in that the first region (21) of the first element (5) has a smaller surface than that of the second region (22) of the second element (2, 18). Dispositif selon la revendication 15, caractérisé en ce que la première région (21) du premier élément (5) présente une longueur (1₃), prise dans la direction longitudinale de la tête du sachet, qui est inférieure à celle (l₄) de la deuxième région (22) du deuxième élément (2, 18).Device according to claim 15, characterized in that the first region (21) of the first element (5) has a length (1₃), taken in the longitudinal direction of the head of the sachet, which is less than that (l₄) of the second region (22) of the second element (2, 18). Procédé de fabrication d'un emballage selon une des revendications précédentes caractérisé en ce qu'il comporte les étapes suivantes: a) former des sachets individuels (10) fermés aux deux extrémités (16, 17) et présentant une tête de sachet (17) ayant un premier et un deuxième bords (31, 32) solidarisés l'un à l'autre par leur face interne (46, 47) avec une première force de solidarisation. b) solidariser une première (55) et une deuxième (56) région respectivement d'un premier (5) et d'un deuxième élément (2, 18) à la face externe respectivement du premier (31) et du deuxième bords (32), de sorte que la première surface (55) soit solidaire de la face externe (45) du premier bord (31) avec une deuxième force de solidarisation, et que la deuxième surface (56) soit solidaire de la face externe (48) du deuxième bord (32) avec une troisième force de solidarisation, et en ce que la deuxième et la troisième forces de solidarisation sont supérieures à la première force de solidarisation. Method for manufacturing a package according to one of the preceding claims, characterized in that it comprises the following steps: a ) forming individual sachets (10) closed at both ends (16, 17) and having a sachet head (17) having first and second edges (31, 32) secured to each other by their face internal (46, 47) with a first securing force. b ) securing a first (55) and a second (56) region respectively of a first (5) and a second element (2, 18) to the external face respectively of the first (31) and the second edges (32 ), so that the first surface (55) is integral with the external face (45) of the first edge (31) with a second securing force, and that the second surface (56) is integral with the external face (48) of the second edge (32) with a third joining force, and in that the second and third joining forces are greater than the first joining force. Procédé selon la revendication 18 caractérisé en ce qu'il comporte, entre les étapes a et b, l'étape bo suivante:
   bo) introduire le sachet (10) dans une boîte (1) de manière que la tête de sachet (17) soit adjacente au couvercle (5) non replié de la boîte, qui constitue le premier élément, la face avant (2) de la boîte constituant le deuxième élément.Method according to claim 18 characterized in that it comprises, between steps a and b, the following step b o :
b o ) introduce the bag (10) into a box (1) so that the bag head (17) is adjacent to the non-folded cover (5) of the box, which constitutes the first element, the front face (2) of the box constituting the second element. Procédé selon une des revendications 18 ou 19, caractérisé en ce qu'il comporte, avant l'étape a, l'étape ao suivante :
   ao) former un tube d'ensachage (50) continu défilant avec une vitesse de défilement donnée dans lequel des produits (51) à ensacher sont disposés en des quantités données à des intervalles prédéterminés, et fermer ce tube (50) par une bande longitudinale de fermeture (67) présentant une zone de jonction (68) avec un bord de la tête de sachet (17).Method according to one of claims 18 or 19, characterized in that it comprises, before step a, the following step a o :
a o ) forming a continuous bagging tube (50) running with a given running speed in which products (51) to be bagged are arranged in given quantities at predetermined intervals, and closing this tube (50) with a strip longitudinal closure (67) having a junction zone (68) with an edge of the bag head (17). Procédé selon la revendication 20, caractérisé en ce que l'étape a met en oeuvre une thermosoudure de la face interne (46, 47) des premier (31) et deuxième (32) bords, ladite thermosoudure étant réalisée de manière telle que la zone de jonction (68) présente une région localisée dans laquelle les faces internes (46, 47) du premier (31) et du deuxième (32) bords sont plus faiblement solidarisées l'une à l'autre de manière à former une amorce de désolidarisation.Method according to claim 20, characterized in that step a uses a heat seal on the internal face (46, 47) of the first (31) and second (32) edges, said heat seal being produced in such a way that the zone junction (68) has a localized region in which the internal faces (46, 47) of the first (31) and second (32) edges are more weakly joined to each other so as to form a primer of separation . Procédé selon une des revendications 18 à 21, caractérisé en ce que l'étape a met en oeuvre une thermosoudure pelable (200) des premier et deuxième bords (31, 32) selon une surface continue.Method according to one of claims 18 to 21, characterized in that step a uses a peelable heat seal (200) of the first and second edges (31, 32) on a continuous surface. Procédé selon la revendication 22, caractérisé en ce que la thermosoudure (200) est réalisée avec une vitesse longitudinale réduite par rapport avec la vitesse de défilement du tube d'ensachage (50).Method according to claim 22, characterized in that the heat sealing (200) is carried out with a reduced longitudinal speed with respect to the running speed of the bagging tube (50). Procédé selon une des revendications 22 ou 23, caractérisé en ce que le tube d'ensachage (50) est réalisé à partir d'un film de polypropylène et en ce que la température des mors de thermosoudure est comprise entre 100°c et 180°c et notamment entre 120°C et 140°C.Method according to one of claims 22 or 23, characterized in that the bagging tube (50) is produced from a polypropylene film and in that the temperature of the heat-sealing jaws is between 100 ° C. and 180 ° C. and in particular between 120 ° C. and 140 ° C.
EP95402583A 1994-11-18 1995-11-17 Reclosable opening means for a bag Expired - Lifetime EP0712785B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9413836 1994-11-18
FR9413836A FR2727088B1 (en) 1994-11-18 1994-11-18 DEVICE FOR CLOSING AND OPENING A PACKAGE COMPRISING A BAG

Publications (2)

Publication Number Publication Date
EP0712785A1 true EP0712785A1 (en) 1996-05-22
EP0712785B1 EP0712785B1 (en) 1998-10-21

Family

ID=9468936

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95402583A Expired - Lifetime EP0712785B1 (en) 1994-11-18 1995-11-17 Reclosable opening means for a bag

Country Status (6)

Country Link
EP (1) EP0712785B1 (en)
AT (1) ATE172420T1 (en)
AU (1) AU4181296A (en)
DE (1) DE69505482D1 (en)
FR (1) FR2727088B1 (en)
WO (1) WO1996015947A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009055439A1 (en) * 2007-10-22 2009-04-30 Meadwestvaco Packaging Systems, Llc Package with opening feature

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2337891A (en) * 1941-08-16 1943-12-28 Pneumatic Scale Corp Package
US3051367A (en) * 1960-10-13 1962-08-28 Armour & Co Container
US3233818A (en) * 1964-07-15 1966-02-08 Diamond Int Corp Reclosable carton and blank
US4032060A (en) * 1975-12-24 1977-06-28 Bergstein Packaging Trust Carton with self-sealing reclosable end closure
GB2032393A (en) 1978-08-17 1980-05-08 Toppan Printing Co Ltd Lined boxes
EP0167064A1 (en) 1984-07-05 1986-01-08 Societe Des Produits Nestle S.A. Reclosable package

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2337891A (en) * 1941-08-16 1943-12-28 Pneumatic Scale Corp Package
US3051367A (en) * 1960-10-13 1962-08-28 Armour & Co Container
US3233818A (en) * 1964-07-15 1966-02-08 Diamond Int Corp Reclosable carton and blank
US4032060A (en) * 1975-12-24 1977-06-28 Bergstein Packaging Trust Carton with self-sealing reclosable end closure
GB2032393A (en) 1978-08-17 1980-05-08 Toppan Printing Co Ltd Lined boxes
EP0167064A1 (en) 1984-07-05 1986-01-08 Societe Des Produits Nestle S.A. Reclosable package

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009055439A1 (en) * 2007-10-22 2009-04-30 Meadwestvaco Packaging Systems, Llc Package with opening feature

Also Published As

Publication number Publication date
EP0712785B1 (en) 1998-10-21
FR2727088B1 (en) 1997-01-17
DE69505482D1 (en) 1998-11-26
AU4181296A (en) 1996-06-17
ATE172420T1 (en) 1998-11-15
WO1996015947A1 (en) 1996-05-30
FR2727088A1 (en) 1996-05-24

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