EP1675789B1 - Bag having an elastic band, and method for the production thereof - Google Patents

Bag having an elastic band, and method for the production thereof Download PDF

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Publication number
EP1675789B1
EP1675789B1 EP04787362A EP04787362A EP1675789B1 EP 1675789 B1 EP1675789 B1 EP 1675789B1 EP 04787362 A EP04787362 A EP 04787362A EP 04787362 A EP04787362 A EP 04787362A EP 1675789 B1 EP1675789 B1 EP 1675789B1
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EP
European Patent Office
Prior art keywords
bag
elastic band
elastic
face
bags
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.)
Expired - Lifetime
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EP04787362A
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German (de)
French (fr)
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EP1675789A1 (en
Inventor
John Persenda
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Sphere SA
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Sphere SA
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Publication date
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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
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/28—Strings or strip-like closures, i.e. draw closures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65F—GATHERING OR REMOVAL OF DOMESTIC OR LIKE REFUSE
    • B65F1/00—Refuse receptacles; Accessories therefor
    • B65F1/0006—Flexible refuse receptables, e.g. bags, sacks

Definitions

  • the present invention relates to a bag, in particular a plastic bag, in particular a garbage storage bag, of the so-called "elastic band” type, bordering the opening of the bag to enable the bag to be elastically retained on a bin, and a bag method of manufacturing such a bag.
  • plastic bags generally comprise two plastic faces connected to one another on their periphery, leaving an opening zone. These bags are most often rectangular in shape, although other forms are possible: for example, the bottom of the bag may have a rounded shape. In the remainder of the description, for convenience, reference will be made to rectangular shaped bags, but it is understood that the bags according to the present invention are not limited to this form.
  • the bags can be prepared from two rectangular sheets of plastic material by welding three sides of the rectangle and leaving the fourth side open. They can also be prepared from a single sheet of plastic material that is folded, either to form the bottom of the bag, or to form a lateral side of the bag, two of the other sides being heat-welded. In known manner, in the bags, the faces can be connected together by a bellows at the bottom and / or at a lateral side, preferably both lateral sides.
  • the link may consist of a single strand, the two ends of the link being fixed between them. It may also consist of two strands, each strand being fixed by each of its ends to the sheath.
  • the link is preferably a plastic tape capable of being heat-welded.
  • the sheath is usually prepared by folding the sheet of plastic parallel to the opening and heat-sealing parallel to the edge of the film.
  • the sheath can be continuous or formed of two separate parts. This is particularly the case when the bags are formed by heat-sealing the lateral sides and that the sheath is formed by folding the plastic sheet before heat-sealing the lateral sides.
  • a bag of the type to sliding link wherein the sliding link is of elastic or expandable material.
  • This closed-loop elastic link is characterized by the fact that the length of its periphery is less than that of the opening of the bag, so that the user must elastically extend the sliding link to fix it around the periphery of the bag.
  • a receptacle for example a bin.
  • the above elastic sliding link bags have a double disadvantage, due to the presence of lateral recesses, relatively deep, which are formed on the longitudinal edge of the bag opening.
  • the presence of these relatively wide recesses on the one hand has the disadvantage of not allowing complete closure of the bag, when the sliding links are knotted after filling the bag. Indeed, during the transport or the storage of the bags filled with waste, waste could escape by these abutments.
  • the presence of these relatively wide recesses decreases the length of sheath in contact with the link, and therefore weakens the bag when it is transported full using the elastic sliding link as a handle.
  • Document EP-A-1 013 567 also discloses a bag of the sliding link type made of plastic, and comprising an elastic band whose ends are fixed by a hot-melt glue to one of the external faces of the bag, in the vicinity but away from the sheath enclosing the sliding plastic link.
  • This elastic band is gripped from the outside by the user, after the edge of the bag has been folded around the neck of a bin, and the user can elastically extend it so that the ribbon forms a loop closed that can grip the periphery of the container, for elastically holding the bag on the trash.
  • the elastic band preferably of rubber, can be chosen to have a maximum elongation of 800%, this elastic band preferably has an elastic elongation of less than 500%.
  • the elastic tape has a rest length of the order of a quarter of the length of the periphery of the container.
  • the elastic band is elongated so as to surround only three sides of the container, which corresponds to an elastic elongation of the order of 200%, that is to say a tripling of its length.
  • the elastic strip is elongated so as to form a closed loop which encloses the entire periphery of the container, which corresponds to an elastic elongation of the order of 400%, ie a multiplication by five its length at rest.
  • the elastic tape has a length slightly less than the half-periphery of the container, so that it is necessary to form a closed loop with the elastic tape to ensure the elastic retention of the bag on the container, which corresponds to an elastic elongation of at least 200%, that is to say at least a tripling of its length.
  • this elastic band is used solely for the elastic holding of the bag on the container, while the plastic sliding link is used for the knotting, in order to close the bag.
  • the document EP-A-1 266 837 discloses a bag of the sliding link type of plastic, further comprising an elastic tape which is attached at its ends to the lateral edges of the bag and is, in a variant, housed in the same sheath as the plastic sliding link, or disposed on the outer face of said sheath.
  • an elastic tape which is attached at its ends to the lateral edges of the bag and is, in a variant, housed in the same sheath as the plastic sliding link, or disposed on the outer face of said sheath.
  • the elastic elongation of the tape must be greater than 200%, for example 250% and preferably 300% or more.
  • the plastic sheets constituting the sides of the bag as well as the various links and ribbons are driven on multiple rollers or drive rollers, to ensure a tensioning minimum of all these elements.
  • a highly elastic ribbon subjected to such tensioning could undergo elastic deformations during the process of manufacture of the bag chain, affecting the quality of the thermo-welds, or even causing a puckering of the bag, if these welds are not properly made.
  • the object of the invention is therefore to propose a bag of the elastic band type making it possible to fix the periphery of the bag elastically on a receptacle and which makes it possible to avoid the aforementioned drawbacks.
  • Another object of the invention is to avoid the risk of waste falling out of the bag, after closing it.
  • the invention also aims to limit the risk of rupture or tearing of the elastic band or the risk of deformation of the elastic band during transport of the filled bag including waste.
  • the subject of the invention is a bag consisting of two faces connected to each other over their entire periphery, with the exception of a longitudinal edge, the bag having an opening opening on said longitudinal edge, the two sides of the bag. being welded to one another along two opposite lateral edges, at least one face being provided, in the vicinity of said opening, with at least one elastic band connected to said face by two connecting zones so that the useful length at rest of said elastic band between the two connecting zones corresponds to the spacing between the two connection zones on the bag and is less than the length of the longitudinal edge of said face of the bag, a bag of this type being described in the document EP-A-1 013 567.
  • the bag according to the invention is characterized in that the elastic band extends over the entire width of the bag, from one side edge to the other, said elastic band being welded to both sides of the bag along said lateral edges, at least one of the two aforementioned connecting zones forming an intermediate so-called connecting zone located at a distance from the two aforementioned lateral edges.
  • the effective length at rest of the elastic band may vary slightly, depending on the elasticity of the band and its slight deformation during its welding to the bag.
  • This elastic band which is not housed in a sheath, can thus be manufactured continuously in a method of manufacturing a bag chain, while having a reduced useful length, corresponding to the narrowing of the extensible and gripping portion of the outside of said elastic band due to the presence of the intermediate bonding zone between the two lateral edges of the bag.
  • the elastic band has a rest length significantly less than the width of the bag. Even if a passage, purely general and without any example of application, indicates that this band can extend over the entire width of the bag, there is no provision for it to be welded to the side edges of the bag.
  • This band is in practice fixed by a heat-adhesive glue, which can not therefore be located at the welds of the lateral edges of the bag, without affecting the good bonding of the band on the bag.
  • Each strip is bonded individually and discontinuously, as can be seen in FIGS. 7 and 17, which distances the person skilled in the art from the present invention which is suitable for welding a continuous elastic band along the length of a chain of bags.
  • each face of the bag comprises a sheath bordering said opening and in which is disposed a non-elastic sliding link, each non-elastic sliding link being grippable from the outside by at least one recess formed through said sheaths, so that this non-elastic sliding link serves essentially to knot for closure of the bag, while the elastic band serves mainly to maintain elastic bag on a container.
  • each face of the bag is folded inwards, along the longitudinal edge of the bag, so that part of the fold forms the aforementioned sheath and is extended beyond by a skirt, said elastic band being connected to the corresponding face of the bag overlapping at least partially said skirt.
  • the intermediate bonding zone can be made at least partially on a double thickness of plastic sheets constituted by a face of the bag and the aforementioned skirt.
  • this intermediate bonding zone does not extend in the portion of the fold forming the sheath, in order to let the non-elastic link freely slide in the sheath.
  • the fact of performing the welding of the elastic band at its intermediate bonding zone on a double sheet thickness reinforces the intermediate weld which is subjected to high tensile stresses.
  • each face of the bag associated with the elastic band is folded inwards along the longitudinal edge of the bag, so that the elastic band is connected to said face, overlapping at least partially said fold.
  • the other of the two aforementioned bonding zones forms another intermediate bonding zone situated at a distance from the two aforementioned lateral edges and from the first intermediate bonding zone.
  • the other of the two aforementioned bonding areas is constituted by the weld zone of the elastic band with the lateral edge of the bag furthest from the aforementioned intermediate bonding zone.
  • both sides of the bag form a double layer of sheets for bonding the elastic band at the side edge.
  • each elastic band is connected to an inner face of the bag.
  • each elastic band may be connected to an outer face of the bag.
  • each elastic band is longitudinally cut into two vertically adjacent strands, the respective connection areas of which are in the vertical extension of one another, so that the two strands form with the bag a closed loop, each strand of which is intended to grip an opposite side of a container.
  • one of the strands will remain along the side of the bag that carries it, while the other strand will be elastically elongated to grip the opposite side of the container.
  • the intermediate bonding zone of the elastically elongated strand which is subjected to the highest stresses, is thus locally reinforced by the intermediate bonding zone of the adjacent strand.
  • the elastic band has a degree of elongation of less than 150%, and preferably of the order of 100%.
  • this elastic band is based on ethylene vinyl acetate (EVA).
  • the bag 1 consists of two substantially parallel rectangular faces 1a, 1b, the faces 1a, 1b being constituted by the same sheet of plastics material. which is folded to form the bottom 1c of the bag, the bottom 1c being rounded when the bag is in the carrying position, as shown in Figure 2.
  • the faces 1a and 1b are brought back one against the other and are connected at the bottom 1c by a flat fold, as shown in Figure 1.
  • the faces 1a and 1b are interconnected by corresponding welds 2a and 3a.
  • These welds 2a and 3a extend substantially over the entire height of the bag 1 and form a vertical line, but these welds may not be linear but extend over the entire lateral marginal zone of the bag.
  • the periphery of the bag comprises an opening zone 1d defined along the longitudinal edge of each face 1a and 1b, the longitudinal edge of each face 1a and 1b extending at the level of the zone of opening 1d, by an inner fold 4, one end of which is welded to the corresponding face of the bag by a longitudinal weld 4a.
  • This fold 4 extends beyond the longitudinal weld 4a by a skirt 4b, which may be free or itself welded to the corresponding face of the bag.
  • the longitudinal weld 4a is preferably continuous over the entire width of the bag. It can also be non-continuous, in broken lines or in dashed lines.
  • the inner fold 4 forms a sheath 8 in which is disposed a non-elastic sliding link 6.
  • a strip of elastic material 16 On the skirt 4b of the face of the bag, is disposed a strip of elastic material 16, which is connected to the side edges 2 and 3 by the transverse weld lines 2a and 3a.
  • the elastic band 16 completely overlaps the skirt 4b, without interfering with the sheath 8, so that the non-elastic sliding link, for example plastic, can freely slide between its ends which are also welded with the transverse welds 2a and 3a.
  • the lower edge of the elastic band 16 may exceed or exactly correspond to the lower edge of the skirt 4b.
  • the elastic band 16 has a so-called intermediate connection zone 17 with the face 1a of the bag, which consists of a vertical line of welding or gluing or the like, this line 17 being limited to the height of the strip 16.
  • the strip elastic 16 overlaps the longitudinal weld 4a, without interfering with the sliding link 6, so that the tensile forces exerted on the line 17 are taken up by the weld 4a, thereby reinforcing the strength of the line 17 to the tear.
  • each side of the bag could comprise an elastic band.
  • FIGS. 1 and 2 there is shown a recess 12, substantially in the middle part of each sheath 8, along the longitudinal edge of the opening of the bag, the recess 12 passing through the faces 1a and 1b of the bag, each side of it.
  • This recess is represented here of substantially semicircular shape, but it could have any shape, for example oval or square, or other, and it is not necessary that the sliding link 6 is apparent throughout its height through the 12.
  • This recess 12 may be provided laterally, substantially similar to the recess 112 which will be described later with reference to the embodiments of Figures 6 and 7.
  • the main function of the elastic band 16 is to allow the periphery of the bag to be elastically adjusted to the edge of a receptacle, whereas the non-elastic tie 6 will be used mainly to carry the bag once filled with waste and / or to tie the links 6 to close the bag (see Figure 8). Given the provision of the link 6 and the band 16, it is understood that closing the bag will be completely closed, avoiding or limiting the risk waste falling out of the bag during transport or storage. When transporting the full bag, it is the other plastic link 6 which is used to prevent deformation of the elastic band.
  • the reference numeral I indicates the inside of the bag, in the open position.
  • the elastic band 16 is disposed over the entire width of the bag, from one side edge 2 to the other 3, in a stretched but not elastically elongated state when the bag is flat, to prevent any crimping of the bag.
  • the limited weld line 17 is made in the vicinity of a lateral edge 3 of the bag, so that the gripping portion of the outside and elastically deformable of the strip 16 is that between the line 17 and the opposite lateral edge 2 la further away.
  • the spacing L2 between the two welds 2a and 17 on the elastic band 16 is substantially smaller than the length L1 between the welds of the two side edges 2 and 3 of the bag, which makes it possible to produce an elastic band having a useful length at rest less than that of the opening of the bag.
  • the elastic band to maintain the bag on a bin having a perimeter of the order of 1 meter, it is necessary to lengthen the elastic band from 34 cm to 66 cm, turning the band on the side of the trash opposite to that where is initially arranged the band, which corresponds to a degree of elastic elongation of the order of 94%.
  • the material be selected with a slightly higher degree of elastic elongation to facilitate placement of the web on the opposite side of the container.
  • the degree of elastic elongation required remains less than 150% and is preferably of the order of 100%.
  • the length L2 may advantageously be chosen on the order of 2/3 of L1.
  • the link 6 and the band 16 are different in color from the color of the sheet constituting the faces 1a and 1b and the link and the band can themselves be distinguished by different colors.
  • the strip 16 made of elastic material for example ethylene vinyl acetate (EVA)
  • EVA ethylene vinyl acetate
  • the other non-elastic link 6 is, for example, plastic material, for example high density polyethylene.
  • FIG. 2 shows the elastic band 16 in a slightly relaxed state inside the bag in the open position I, ie in a position in which the elastic band 16 is no longer necessarily in contact, in particular in its middle part, with the inner wall vis-à-vis the bag.
  • the user can easily, from the outside, seize the elastic band 16 by introducing his hand through the opening 1d.
  • the bag differs from that illustrated in FIGS. 1 and 2 essentially in that the elastic band 16 is connected to the skirt 4b by two intermediate connection zones 17 and 17 ', which are symmetrical to each other with respect to a plane passing through the median recesses 12.
  • the two intermediate connection zones 17 and 17' could be arranged at different distances from the respective lateral edges 3a and 2a, without departing from the scope of the invention.
  • the distance L2 is here defined between the zones 17 and 17 '.
  • zones 17 and 17 ' can be provided so as to obtain a distance L2 equal to 34 cm, each zone 17, 17' being spaced apart. of its corresponding lateral border 3 and 2 of about 8 cm respectively.
  • the elastic band 16 is entirely arranged on the skirt 4b, while in the first embodiment, the elastic band protruded on either side of the skirt.
  • the rim of the bag at its opening is folded over the peripheral edge of the container, as shown in Figure 3, which makes it advantageously appear the elastic band 16 which is now oriented towards the outside of the outer wall of the container.
  • the elastic band is disposed on the outer wall of the bag, as described below with reference to Figures 6 and 7, the elastic band is then hidden between the outer wall of the container and the folded edge of the bag, but the user can easily seize the elastic band by sliding its hand between the folded edge of the bag and the outer wall of the container to pull it down and fold down the other side of the container.
  • the bag 101 differs essentially from the aforementioned bag 1 in that the median recess 12 is optional, at least one lateral recess 112 being provided to give the access of the external to the non-elastic sliding link 106.
  • This non-elastic sliding link 106 is welded at one end to the lateral edge 2 of the bag, along the weld line 2a, while the opposite ends of the non-elastic link 106 are welded together along a weld 107 which is made through the recess 112, so that this end of the non-elastic link 106 is not tied to the side edge 3 of the bag.
  • This non-elastic sliding link variant is known per se.
  • each lateral recess 112 may have any shape, including quarter-circle, quarter-ellipse or rectangular.
  • the bag 101 also differs in that the elastic band 116 is fixed on the outer wall of the bag face 1a, its upper edge being situated slightly above the above-mentioned line 4a, while its lower edge is situated above the lower edge of the skirt 4b.
  • the elastic band 116 partially overlaps the skirt 4b and the portion of the fold 4 forming the sheath for the sliding link 106, without the link 106 and the strip 116 can not be superimposed.
  • the use of the bag 101 is substantially similar to that of the bag 1, as described with reference to Figures 3 to 5.
  • the elastic band is cut or split longitudinally into two separate strands 116a and 116b, vertically adjacent and arranged, for example, on the outer wall of the face 1a of the bag.
  • the strand 116a can remain, for example, on the side 1a of the bag, without elongation, while the other strand 116b is elongated to grip the other side of the container, in a similar manner to the aforementioned strip 16.
  • the two strands 116a and 116b form with the bag 101 a substantially closed loop around the container.
  • the intermediate connection zone 117b which is subjected to high stress is locally enhanced by the presence of the intermediate weld 117a of the other strand 116a.
  • FIGS. 6 and 7 there is shown in broken lines the additional median recess 12, thus giving access to the non-elastic link 106.
  • a median recess 12 is not necessary because the user can already access at the non-elastic connection 106 by the lateral recess 112.
  • Figure 9 shows a step of a continuous manufacturing process of a bag chain from which can be derived the aforementioned bag 1.
  • each half sleeve circular or elliptical portions are cut at regular intervals corresponding to one bag width (or twice the width of a bag if only one lateral recess is provided per bag) to form semi-circular or semi-elliptical recesses 12 after folding the edge longitudinally of the sheet 20 of the half sleeve inwards, as shown in FIG. 9.
  • the shape of the blank can be any, for example square, rectangular or other.
  • a plastic tape 6 is introduced inside each fold 4, before closing by a longitudinal heat seal to form the sheath.
  • an elastic band 16 is introduced into the sheath along the free edge of the fold 4, overlapping it at least partially.
  • thermo-welds 2a and 3a are made substantially halfway between the semi-circular or semi-elliptical cuts.
  • Each pair of thermo-welds 2a or 3a is such that the individual bags can then be separated by transverse cutting or by pre-cutting between the heat-welds of each pair.
  • the machine also performs transverse heat-sealing 17 limited to the portion corresponding to the elastic tape 16 to form the aforementioned intermediate bonding areas limiting the effective length at rest of the elastic band.
  • FIG. 10 A fifth embodiment will now be described with reference to FIG. 10, on which is represented a bag 201 which differs essentially from the preceding bags in that it does not comprise a non-elastic sliding link, the bag 201 simply comprising an elastic band 216 along a face 1b of the bag, inside as shown, or outside.
  • this bag 201 also comprises an internal fold 4, whose lower inner edge 4a is not necessarily welded to the rest of the bag, outside the borders 2 and 3.
  • the elastic band 216 is disposed at the right of this inner fold 4, so that the limited transverse seam 217, located between the side welds 2a and 3a, is reinforced by the double thickness of material at the level of the withdrawal 4.
  • the other embodiments of the elastic band illustrated with reference to Figures 1 to 9, are applicable to the bag 201 devoid of sliding plastic link.
  • the elastic band 216 could be cut into two strands as in FIG. 7, or else provided outside as in FIG. 6, or could comprise two intermediate connection zones as in FIGS.
  • the overlap between the fold and the elastic band may be total or partial as illustrated in the other figures.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Refuse Receptacles (AREA)
  • Making Paper Articles (AREA)
  • Package Frames And Binding Bands (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)

Abstract

The bag (1) has an elastic band (16) extending on the entire width of the bag and joined at two sides (1a, 1b) of the bag along lateral ends (2, 3). The band is connected to the side (1a) by connection zones (17, 2a), where the connection zone (17) forms an intermediate connection zone situated at a distance from the lateral ends. The sides are joined with each other along the lateral ends. An independent claim is also included for a method of continuous manufacture of chain of bags.

Description

La présente invention concerne un sac, notamment en matière plastique, en particulier un sac de stockage des ordures ménagères, du type dit "à bande élastique", bordant l'ouverture du sac pour permettre de retenir élastiquement le sac sur une poubelle, et un procédé de fabrication d'un tel sac.The present invention relates to a bag, in particular a plastic bag, in particular a garbage storage bag, of the so-called "elastic band" type, bordering the opening of the bag to enable the bag to be elastically retained on a bin, and a bag method of manufacturing such a bag.

De façon générale, dans les pays industrialisés, les déchets et ordures, en particulier les ordures ménagères, sont stockés dans des sacs en matière plastique. Ces sacs en matière plastique comportent, de façon générale, deux faces en matière plastique reliées l'une à l'autre sur leur périphérie en ménageant une zone d'ouverture. Ces sacs ont le plus souvent une forme rectangulaire, bien que d'autres formes soient possibles : par exemple, le fond du sac peut avoir une forme arrondie. Dans la suite de la description, pour plus de facilité, on se référera à des sacs de forme rectangulaire, mais il est bien entendu que les sacs selon la présente invention ne sont pas limités à cette forme.Generally, in industrialized countries, waste and garbage, especially household waste, are stored in plastic bags. These plastic bags generally comprise two plastic faces connected to one another on their periphery, leaving an opening zone. These bags are most often rectangular in shape, although other forms are possible: for example, the bottom of the bag may have a rounded shape. In the remainder of the description, for convenience, reference will be made to rectangular shaped bags, but it is understood that the bags according to the present invention are not limited to this form.

Les sacs peuvent être préparés à partir de deux feuilles rectangulaires de matière plastique, en soudant trois côtés du rectangle et en laissant le quatrième côté ouvert. Ils peuvent également être préparés à partir d'une seule feuille de matière plastique que l'on replie, soit pour former le fond de sac, soit pour former un côté latéral du sac, deux des autres côtés étant thermo-soudés. De façon connue, dans les sacs, les faces peuvent être reliées entre elles par un soufflet au niveau du fond et/ou au niveau d'un côté latéral, de préférence des deux côtés latéraux.The bags can be prepared from two rectangular sheets of plastic material by welding three sides of the rectangle and leaving the fourth side open. They can also be prepared from a single sheet of plastic material that is folded, either to form the bottom of the bag, or to form a lateral side of the bag, two of the other sides being heat-welded. In known manner, in the bags, the faces can be connected together by a bellows at the bottom and / or at a lateral side, preferably both lateral sides.

Il est également connu de fabriquer des sacs dits à lien coulissant dans lesquels l'ouverture du sac, quel qu'il soit, est bordée d'une gaine dans laquelle un lien est susceptible de coulisser. Le lien peut être constitué d'un seul brin, les deux extrémités du lien étant fixées entre elles. Il peut également être constitué de deux brins, chaque brin étant fixé par chacune de ses extrémités à la gaine. Le lien est de préférence un ruban en matière plastique susceptible d'être thermo-soudé.It is also known to manufacture so-called sliding bags in which the opening of the bag, whatever it is, is lined with a sheath in which a link is slidable. The link may consist of a single strand, the two ends of the link being fixed between them. It may also consist of two strands, each strand being fixed by each of its ends to the sheath. The link is preferably a plastic tape capable of being heat-welded.

La gaine est généralement préparée en repliant la feuille de matière plastique parallèlement à l'ouverture et en la thermo-soudant parallèlement au bord du film. La gaine peut être continue ou formée de deux parties séparées. C'est en particulier le cas lorsque les sacs sont formés par thermo-soudage des côtés latéraux et que la gaine est formée par repli de la feuille de matière plastique avant thermo-soudage des côtés latéraux.The sheath is usually prepared by folding the sheet of plastic parallel to the opening and heat-sealing parallel to the edge of the film. The sheath can be continuous or formed of two separate parts. This is particularly the case when the bags are formed by heat-sealing the lateral sides and that the sheath is formed by folding the plastic sheet before heat-sealing the lateral sides.

De tels sacs à lien coulissant en matière plastique, sensiblement non élastique, sont décrits dans les brevets EP-953 511 et EP-1 232 954 appartenant à la demander esse.Such slider bags of plastic material, substantially inelastic, are described in EP-953 511 and EP-1 232 954 belonging to the application esse.

On a également proposé dans l'état de la technique, par exemple dans le brevet US-5,133,607, dans le modèle d'utilité allemand DE-201 10 350-U1 et dans la demande internationale WO 03/035500, un sac du type à lien coulissant, dans lequel le lien coulissant est en matériau élastique ou extensible. Ce lien élastique en boucle fermée est caractérisé par le fait que la longueur de sa périphérie est inférieure à celle de l'ouverture du sac, de façon que l'utilisateur doit allonger élastiquement le lien coulissant pour venir le fixer autour de la périphérie d'un réceptacle, par exemple d'une poubelle. Ainsi, ce lien coulissant permet de retenir élastiquement le sac sur la poubelle, dans une large gamme de tailles de poubelles, tout en limitant le risque que le sac glisse à l'intérieur de la poubelle, par exemple sous l'effet du poids des déchets à l'intérieur d u sac.It has also been proposed in the state of the art, for example in the US Pat. No. 5,133,607, in the German utility model DE-201 10 350-U1 and in the international application WO 03/035500, a bag of the type to sliding link, wherein the sliding link is of elastic or expandable material. This closed-loop elastic link is characterized by the fact that the length of its periphery is less than that of the opening of the bag, so that the user must elastically extend the sliding link to fix it around the periphery of the bag. a receptacle, for example a bin. Thus, this sliding link can elastically retain the bag on the trash in a wide range of sizes of bins, while limiting the risk that the bag slips inside the trash, for example under the effect of the weight of waste inside the bag.

Toutefois, les sacs à lien coulissant élastique précités présentent un double inconvénient, du fait de la présence d'embrèvements latéraux, relativement profonds, qui sont ménagés sur le bord longitudinal d'ouverture du sac. La présence de ces embrèvements relativement larges présente d'une part l'inconvénient de ne pas permettre la fermeture complète du sac, lorsque les liens coulissants sont noués, après remplissage du sac. En effet, lors du transport ou du stockage des sacs remplis de déchets, des déchets pourraient s'échapper par ces embrèvements. D'autre part, la présence de ces embrèvements relativement larges diminue la longueur de gaine en contact avec le lien, et donc fragilise le sac lorsque celui-ci est transporté plein en utilisant le lien coulissant élastique comme poignée.However, the above elastic sliding link bags have a double disadvantage, due to the presence of lateral recesses, relatively deep, which are formed on the longitudinal edge of the bag opening. The presence of these relatively wide recesses on the one hand has the disadvantage of not allowing complete closure of the bag, when the sliding links are knotted after filling the bag. Indeed, during the transport or the storage of the bags filled with waste, waste could escape by these abutments. On the other hand, the presence of these relatively wide recesses decreases the length of sheath in contact with the link, and therefore weakens the bag when it is transported full using the elastic sliding link as a handle.

En outre, tous ces sacs à lien coulissant élastique ont pour inconvénient commun le fait que le lien élastique peut ne pas présenter une résistance suffisante à la traction pour supporter un poids important de déchets dans le sac, lors du transport. Au surplus, même si la résistance au déchirement est suffisante, si le poids des déchets dans le sac est important, le lien coulissant, qui est généralement utilisé comme poignée par l'utilisateur lors du transport du sac, risque de subir une élongation élastique, ce qui peut faire traîner le sac sur le sol, ou bien le faire descendre suffisamment pour qu'il bute contre des obstacles, ce qui constitue une gêne importante pour l'utilisateur.In addition, all of these bags with elastic sliding link have the common disadvantage that the elastic link may not have sufficient tensile strength to support a weight waste in the bag during transport. Moreover, even if the tear resistance is sufficient, if the weight of the waste in the bag is large, the sliding link, which is generally used as a handle by the user during the transport of the bag, may undergo elastic elongation, which can cause the bag to drag on the ground, or to make it descend sufficiently that it stops against obstacles, which constitutes a significant inconvenience for the user.

On connaît également par le document EP-A-1 013 567 un sac du type à lien coulissant en matière plastique, et comportant un ruban élastique dont les extrémités sont fixées par une colle thermofusible à l'une des faces externes du sac, au voisinage mais à distance de la gaine renfermant le lien coulissant en plastique. Ce ruban élastique est préhensible de l'extérieur par l'utilisateur, après que le bord du sac ait été replié autour du col d'une poubelle, et l'utilisateur peut élastiquement l'allonger de façon à ce que le ruban forme une boucle fermée pouvant enserrer la périphérie du récipient, permettant de maintenir élastiquement le sac sur la poubelle. Bien que le ruban élastique, de préférence en caoutchouc, puisse être choisi de façon à avoir une élongation maximum de 800 %, ce ruban élastique présente de préférence une élongation élastique inférieure à 500 %. Dans un premier exemple, le ruban élastique présente une longueur au repos de l'ordre du quart de la longueur de la périphérie du récipient. Dans une première variante, le ruban élastique est allongé de façon à entourer uniquement trois côtés du récipient, ce qui correspond à une élongation élastique de l'ordre de 200 % , c'est à dire un triplement de sa longueur. Dans une autre variante, le ruban élastique est allongé de façon à former une boucle fermée qui vient enserrer toute la périphérie du récipient, ce qui correspond à un allongement élastique de l'ordre de 400 %, c'est à dire une multiplication par cinq de sa longueur au repos. Dans un autre exemple, le ruban élastique présente une longueur légèrement inférieure à la demi-périphérie du récipient, de sorte qu'il est nécessaire de former une boucle fermée avec le ruban élastique pour assurer le maintien élastique du sac sur le récipient, ce qui correspond à un allongement élastique au moins égal à 200 %, c'est à dire au moins à un triplement de sa longueur. Avantageusement, ce ruban élastique est utilisé uniquement pour le maintien élastique du sac sur le récipient, alors que le lien coulissant plastique est utilisé pour le nouage, afin de fermer le sac.Document EP-A-1 013 567 also discloses a bag of the sliding link type made of plastic, and comprising an elastic band whose ends are fixed by a hot-melt glue to one of the external faces of the bag, in the vicinity but away from the sheath enclosing the sliding plastic link. This elastic band is gripped from the outside by the user, after the edge of the bag has been folded around the neck of a bin, and the user can elastically extend it so that the ribbon forms a loop closed that can grip the periphery of the container, for elastically holding the bag on the trash. Although the elastic band, preferably of rubber, can be chosen to have a maximum elongation of 800%, this elastic band preferably has an elastic elongation of less than 500%. In a first example, the elastic tape has a rest length of the order of a quarter of the length of the periphery of the container. In a first variant, the elastic band is elongated so as to surround only three sides of the container, which corresponds to an elastic elongation of the order of 200%, that is to say a tripling of its length. In another variant, the elastic strip is elongated so as to form a closed loop which encloses the entire periphery of the container, which corresponds to an elastic elongation of the order of 400%, ie a multiplication by five its length at rest. In another example, the elastic tape has a length slightly less than the half-periphery of the container, so that it is necessary to form a closed loop with the elastic tape to ensure the elastic retention of the bag on the container, which corresponds to an elastic elongation of at least 200%, that is to say at least a tripling of its length. Advantageously, this elastic band is used solely for the elastic holding of the bag on the container, while the plastic sliding link is used for the knotting, in order to close the bag.

De manière analogue, le document EP-A-1 266 837 décrit un sac du type à lien coulissant en matière plastique, comportant en outre un ruban élastique qui est fixé à ses extrémités aux bordures latérales du sac et est, dans une variante, logé dans la même gaine que le lien coulissant plastique, ou bien disposé sur la face extérieure de ladite gaine. Comme dans le document EP-A-1 013 567, pour assurer le maintien élastique du sac sur une poubelle, il est nécessaire de former une boucle fermée avec le ruban élastique et il est prévu à cet effet que l'allongement élastique du ruban doit être supérieur à 200 %, par exemple 250 % et, de préférence 300 % ou plus.Similarly, the document EP-A-1 266 837 discloses a bag of the sliding link type of plastic, further comprising an elastic tape which is attached at its ends to the lateral edges of the bag and is, in a variant, housed in the same sheath as the plastic sliding link, or disposed on the outer face of said sheath. As in the document EP-A-1 013 567, to ensure the elastic retention of the bag on a bin, it is necessary to form a closed loop with the elastic tape and it is provided for this purpose that the elastic elongation of the tape must be greater than 200%, for example 250% and preferably 300% or more.

Toutefois, ces deux document EP-A-1 013 567 et EP-A-1 266 837, qui concernent le même type de sac à lien coulissant plastique muni d'un ruban élastique pour le maintien du sac sur un récipient, font appel à des rubans élastiques ayant un degré d'allongement élastique élevé, supérieur à 200 %, ce qui nécessite donc l'utilisation de matériaux élastiques particuliers, qui peuvent être difficile à souder ou à relier au sac, et qui sont, en outre, difficiles à mettre en oeuvre dans un procédé de fabrication en continu d'une chaîne de sacs, car le fort degré d'élasticité du ruban risque de perturber les multiples opérations de soudage, de repliage et de découpe qui sont nécessaires pour fabriquer, par exemple, un rouleau continu d'une chaîne de sacs. En effet, au cours d'un tel procédé de fabrication en continu, les feuilles plastiques constituant les faces du sac ainsi que les différents liens et rubans sont entraînés sur de multiples rouleaux ou galets d'entraînement, afin d'assurer une mise en tension minimale de l'ensemble de ces éléments. Or, un ruban fortement élastique soumis à une telle mise en tension pourrait subir des déformations élastiques au cours du processus de fabrication de la chaîne de sacs, nuisant à la qualité des thermo-soudures, voire provoquant un fronçage du sac, si ces thermo-soudures ne sont pas correctement effectuées.However, these two documents EP-A-1 013 567 and EP-A-1 266 837, which relate to the same type of bag plastic sliding link provided with an elastic tape for holding the bag on a container, call upon elastic tapes having a high degree of elastic elongation, greater than 200%, which therefore requires the use of particular elastic materials, which can be difficult to weld or to connect to the bag, and which are, in addition, difficult to implement in a continuous manufacturing process of a bag chain, because the high degree of elasticity of the ribbon may disrupt the multiple welding, folding and cutting operations that are necessary to manufacture, for example, a continuous roll of a chain of bags. Indeed, during such a continuous manufacturing process, the plastic sheets constituting the sides of the bag as well as the various links and ribbons are driven on multiple rollers or drive rollers, to ensure a tensioning minimum of all these elements. However, a highly elastic ribbon subjected to such tensioning could undergo elastic deformations during the process of manufacture of the bag chain, affecting the quality of the thermo-welds, or even causing a puckering of the bag, if these welds are not properly made.

C'est d'ailleurs pour cette raison que dans le document EP-A-1 013 567 les rubans élastiques sont collés individuellement et séparément sur chaque sac de la chaîne de sacs, soit transversalement à la direction d'avancement de la chaîne de sacs, soit parallèlement à ladite direction.It is for this reason that in the document EP-A-1 013 567 the elastic tapes are glued individually and separately on each bag of the sack chain, either transversely the direction of advancement of the bag chain, parallel to said direction.

L'invention a donc pour but de proposer un sac du type à bande élastique permettant de fixer élastiquement la périphérie du sac sur un réceptacle et qui permette d'éviter les inconvénients précités. Un autre but de l'invention est d'éviter les risques de chute des déchets hors du sac, après fermeture de celui-ci. L'invention a également pour but de limiter le risque de rupture ou de déchirure de la bande élastique ou les risques de déformation de la bande élastique lors du transport du sac rempli notamment de déchets.The object of the invention is therefore to propose a bag of the elastic band type making it possible to fix the periphery of the bag elastically on a receptacle and which makes it possible to avoid the aforementioned drawbacks. Another object of the invention is to avoid the risk of waste falling out of the bag, after closing it. The invention also aims to limit the risk of rupture or tearing of the elastic band or the risk of deformation of the elastic band during transport of the filled bag including waste.

A cet effet, l'invention a pour objet un sac constitué de deux faces reliées entre elles sur toute leur périphérie, à l'exception d'un bord longitudinal, le sac présentant une ouverture débouchant sur ledit bord longitudinal, les deux faces du sac étant soudées l'une à l'autre le long de deux bordures latérales opposées, au moins une face étant munie, au voisinage de ladite ouverture, d'au moins une bande élastique reliée à ladite face par deux zones de liaison de façon que la longueur utile au repos de ladite bande élastique entre les deux zones de liaison corresponde à l'écartement entre les deux zones de liaison sur le sac et soit inférieure à la longueur du bord longitudinal de ladite face du sac, un sac de ce type étant décrit dans le document EP-A-1 013 567. Le sac selon l'invention est caractérisé par le fait que la bande élastique s'étend sur toute la largeur du sac, d'une bordure latérale à l'autre, ladite bande élastique étant soudée aux deux faces du sac le long desdites bordures latérales, l'une au moins des deux zones de liaison précitées formant une zone de liaison dite intermédiaire située à distance des deux bordures latérales précitées. Au sens de l'invention, la longueur utile au repos de la bande élastique peut varier légèrement, en fonction de l'élasticité de la bande et de sa légère déformation lors de sa soudure au sac. Cette bande élastique, qui n'est pas logée dans une gaine, peut ainsi être fabriquée en continu dans un procédé de fabrication d'une chaîne de sacs, tout en présentant une longueur utile réduite, correspondant au rétrécissement de la partie extensible et préhensible de l'extérieur de ladite bande élastique du fait de la présence de la zone de liaison intermédiaire entre les deux bordures latérales du sac.For this purpose, the subject of the invention is a bag consisting of two faces connected to each other over their entire periphery, with the exception of a longitudinal edge, the bag having an opening opening on said longitudinal edge, the two sides of the bag. being welded to one another along two opposite lateral edges, at least one face being provided, in the vicinity of said opening, with at least one elastic band connected to said face by two connecting zones so that the useful length at rest of said elastic band between the two connecting zones corresponds to the spacing between the two connection zones on the bag and is less than the length of the longitudinal edge of said face of the bag, a bag of this type being described in the document EP-A-1 013 567. The bag according to the invention is characterized in that the elastic band extends over the entire width of the bag, from one side edge to the other, said elastic band being welded to both sides of the bag along said lateral edges, at least one of the two aforementioned connecting zones forming an intermediate so-called connecting zone located at a distance from the two aforementioned lateral edges. For the purposes of the invention, the effective length at rest of the elastic band may vary slightly, depending on the elasticity of the band and its slight deformation during its welding to the bag. This elastic band, which is not housed in a sheath, can thus be manufactured continuously in a method of manufacturing a bag chain, while having a reduced useful length, corresponding to the narrowing of the extensible and gripping portion of the outside of said elastic band due to the presence of the intermediate bonding zone between the two lateral edges of the bag.

Au contraire, dans le document EP-A-1 013 567, la bande élastique a une longueur au repos nettement inférieure à la largeur du sac. Même si un passage, à titre purement général et sans aucun exemple d'application, indique que cette bande peut s'étendre sur toute la largeur du sac, il n'est nullement prévu qu'elle puisse être soudée aux bordures latérales du sac. Cette bande est en pratique fixée par une colle thermo-adhésive, qui ne peut donc être située au niveau des soudures des bordures latérales du sac, sans nuire au bon collage de la bande sur le sac. Chaque bande est collée, de manière individuelle et discontinue, comme visible sur les figures 7 et 17, ce qui éloigne l'homme du métier de la présente invention qui est adaptée à la soudure d'une bande élastique continue sur la longueur d'une chaîne de sacs.On the contrary, in EP-A-1 013 567, the elastic band has a rest length significantly less than the width of the bag. Even if a passage, purely general and without any example of application, indicates that this band can extend over the entire width of the bag, there is no provision for it to be welded to the side edges of the bag. This band is in practice fixed by a heat-adhesive glue, which can not therefore be located at the welds of the lateral edges of the bag, without affecting the good bonding of the band on the bag. Each strip is bonded individually and discontinuously, as can be seen in FIGS. 7 and 17, which distances the person skilled in the art from the present invention which is suitable for welding a continuous elastic band along the length of a chain of bags.

Avantageusement, chaque face du sac comporte une gaine bordant ladite ouverture et dans laquelle est disposé un lien coulissant non-élastique, chaque lien coulissant non-élastique étant préhensible de l'extérieur par au moins un embrèvement ménagé à travers lesdites gaines, de façon que ce lien coulissant non-élastique serve essentiellement au nouage pour la fermeture du sac, alors que la bande élastique sert principalement au maintien élastique du sac sur un récipient.Advantageously, each face of the bag comprises a sheath bordering said opening and in which is disposed a non-elastic sliding link, each non-elastic sliding link being grippable from the outside by at least one recess formed through said sheaths, so that this non-elastic sliding link serves essentially to knot for closure of the bag, while the elastic band serves mainly to maintain elastic bag on a container.

Dans ce cas, on peut prévoir que chaque face du sac est repliée vers l'intérieur, le long du bord longitudinal du sac, de façon qu'une partie du repli forme la gaine précitée et se prolonge au-delà par une jupe, ladite bande élastique étant reliée à la face correspondante du sac en chevauchant au moins partiellement ladite jupe. Ainsi, la zone de liaison intermédiaire pourra être réalisée au moins partiellement sur une double épaisseur de feuilles plastiques constituées par une face du sac et la jupe précitée. De préférence, cette zone de liaison intermédiaire ne s'étend pas dans la partie du repli formant la gaine, afin de laisser librement coulisser le lien non-élastique dans la gaine. Le fait de réaliser la soudure de la bande élastique au niveau de sa zone de liaison intermédiaire sur une double épaisseur de feuilles permet de renforcer cette soudure intermédiaire qui est soumise à de fortes sollicitations en traction.In this case, it can be provided that each face of the bag is folded inwards, along the longitudinal edge of the bag, so that part of the fold forms the aforementioned sheath and is extended beyond by a skirt, said elastic band being connected to the corresponding face of the bag overlapping at least partially said skirt. Thus, the intermediate bonding zone can be made at least partially on a double thickness of plastic sheets constituted by a face of the bag and the aforementioned skirt. Preferably, this intermediate bonding zone does not extend in the portion of the fold forming the sheath, in order to let the non-elastic link freely slide in the sheath. The fact of performing the welding of the elastic band at its intermediate bonding zone on a double sheet thickness reinforces the intermediate weld which is subjected to high tensile stresses.

En variante, chaque face du sac associée à la bande élastique est repliée vers l'intérieur le long du bord longitudinal du sac, de façon que la bande élastique soit reliée à ladite face, en chevauchant au moins partiellement ledit repli. Ainsi, même lorsque le sac ne comporte pas de lien coulissant dans une gaine, il est avantageux de prévoir un repli intérieur pour assurer une double épaisseur de feuilles en plastique au niveau de la zone de liaison intermédiaire de la bande élastique sur le sac.As a variant, each face of the bag associated with the elastic band is folded inwards along the longitudinal edge of the bag, so that the elastic band is connected to said face, overlapping at least partially said fold. Thus, even when the bag has no sliding link in a sheath, it is advantageous to provide an inner fold to ensure a double thickness of plastic sheets at the intermediate bonding zone of the elastic band on the bag.

Selon une autre caractéristique, l'autre des deux zones de liaison précitées forme une autre zone de liaison intermédiaire située à distance des deux bordures latérales précitées et de la première zone de liaison intermédiaire.According to another feature, the other of the two aforementioned bonding zones forms another intermediate bonding zone situated at a distance from the two aforementioned lateral edges and from the first intermediate bonding zone.

En variante, l'autre des deux zones de liaison précitées est constituée par la zone de soudure de la bande élastique avec la bordure latérale du sac la plus éloignée de la zone de liaison intermédiaire précitée. Dans ce cas, les deux faces du sac forment une double épaisseur de feuilles pour 1a liaison de la bande élastique au niveau de la bordure latérale.Alternatively, the other of the two aforementioned bonding areas is constituted by the weld zone of the elastic band with the lateral edge of the bag furthest from the aforementioned intermediate bonding zone. In this case, both sides of the bag form a double layer of sheets for bonding the elastic band at the side edge.

De préférence, chaque bande élastique est reliée à une face interne du sac. Toutefois, en variante, chaque bande élastique peut être reliée à une face externe du sac.Preferably, each elastic band is connected to an inner face of the bag. However, alternatively, each elastic band may be connected to an outer face of the bag.

Dans un autre mode de réalisation particulier, chaque bande élastique est longitudinalement découpée en deux brins verticalement adjacents, dont les zones de liaison respectives sont dans le prolongement vertical l'une de l'autre, de façon que les deux brins forment avec le sac une boucle fermée, dont chaque brin est destiné à enserrer un côté opposé d'un récipient. Dans ce cas, l'un des brins restera le long de la face du sac qui le porte, alors que l'autre brin sera élastiquement allongé pour venir enserrer le côté opposé du récipient. La zone de liaison intermédiaire du brin élastiquement allongé, qui est soumise aux plus fortes sollicitations, est ainsi localement renforcée par la zone de liaison intermédiaire du brin adjacent.In another particular embodiment, each elastic band is longitudinally cut into two vertically adjacent strands, the respective connection areas of which are in the vertical extension of one another, so that the two strands form with the bag a closed loop, each strand of which is intended to grip an opposite side of a container. In this case, one of the strands will remain along the side of the bag that carries it, while the other strand will be elastically elongated to grip the opposite side of the container. The intermediate bonding zone of the elastically elongated strand, which is subjected to the highest stresses, is thus locally reinforced by the intermediate bonding zone of the adjacent strand.

Selon encore une autre caractéristique de l'invention, 1a bande élastique présente un degré d'allongement inférieur à 150 %, et de préférence de l'ordre de 100 %. Par exemple, cette bande élastique est à base d'acétate de vinyle éthylène (EVA).According to yet another characteristic of the invention, the elastic band has a degree of elongation of less than 150%, and preferably of the order of 100%. For example, this elastic band is based on ethylene vinyl acetate (EVA).

La présente invention vise également un procédé de fabrication en continu d'une chaîne de sacs, ledit procédé comprenant les étapes consistant :

  1. a) à disposer à l'intérieur d'une feuille repliée au moins un ruban élastique, le long de l'un des bords longitudinaux de la feuille ;
  2. b) à effectuer, à intervalles réguliers correspondant à la largeur d'un sac, au moins une thermo-soudure transversale limitée sur la hauteur du ruban élastique uniquement, pour former une zone de liaison intermédiaire du ruban élastique sur la face interne correspondante de la feuille ;
  3. c) à effectuer, à intervalles réguliers, correspondant à la largeur d'un sac, une pluralité de paires de thermo-soudures transversales adjacentes correspondant aux bordures latérales des sacs, de façon à thermo-souder avec les bordures latérales des sacs le ruban élastique précité, lesdites paires de thermo-soudures transversales étant effectuées à distance des thermo-soudures transversales limitées précitées;
  4. d) à prédécouper, à intervalles réguliers, la feuille entre les thermo-soudures transversales de chaque paire, pour former une chaîne de sacs prédécoupés.
    Ce procédé de fabrication présente l'avantage de permettre la fabrication en continu d'une chaîne de sacs à bande élastique, dont la longueur utile au repos est inférieure à la largeur d'une face du sac, sans risquer de froncer le corps du sac.
    Avantageusement, le procédé comprend l'étape supplémentaire consistant :
  5. e) avant l'étape a) ou b), à replier vers l'intérieur chaque bord longitudinal de la feuille pour former un repli interne, le ruban élastique précité étant disposé sur un repli, avec un chevauchement au moins partiel, afin que le ruban élastique soit soudé à l'étape b) à au moins une double épaisseur de matière au niveau de sa zone de liaison intermédiaire.
The present invention also provides a method for continuously manufacturing a bag chain, said method comprising the steps of:
  1. a) arranging inside a folded sheet at least one elastic tape, along one of the longitudinal edges of the sheet;
  2. b) performing, at regular intervals corresponding to the width of a bag, at least one transverse thermal seal limited on the height of the elastic band only, to form an intermediate bonding zone of the elastic band on the corresponding inner face of the leaf ;
  3. c) performing, at regular intervals, corresponding to the width of a bag, a plurality of pairs of adjacent transverse thermo-welds corresponding to the lateral edges of the bags, so as to thermo-weld with the lateral edges of the bags the elastic band said pairs of transverse thermo-welds being made at a distance from said limited transverse thermo-welds;
  4. d) pre-cutting, at regular intervals, the sheet between the transverse thermo-welds of each pair, to form a precut bag chain.
    This method of manufacture has the advantage of allowing the continuous manufacture of a chain of bags elastic band, whose useful length at rest is less than the width of one side of the bag, without the risk of frowning the body of the bag .
    Advantageously, the method comprises the additional step of:
  5. e) before step a) or b), folding inwardly each longitudinal edge of the sheet to form an inner fold, the aforementioned elastic band being arranged on a fold, with at least partial overlap, so that the elastic tape is welded in step b) to at least a double thickness of material at its intermediate bonding zone.

Selon encore une autre caractéristique de l'invention, le procédé comprend les étapes supplémentaires consistant avant l'étape a) :

  • f) à découper des portions de film au voisinage des deux bords longitudinaux de la feuille repliée, à des intervalles réguliers correspondant au moins à la largeur d'un sac, par exemple une ou deux largeurs de sac ;
  • g) à disposer à l'intérieur de ladite feuille repliée deux rubans de matière non-élastique, au droit desdites portions découpées sur chaque face de la feuille de façon que chaque ruban non-élastique soit logé à l'intérieur d'un repli ;
  • h) à thermo-souder les replis parallèlement à la direction longitudinale, pour former une gaine dans laquelle est logé chaque ruban non-élastique, le ruban élastique chevauchant au moins partiellement la portion restante formant jupe du repli.
According to yet another characteristic of the invention, the method comprises the additional steps consisting of before step a):
  • f) cutting portions of film in the vicinity of the two longitudinal edges of the folded sheet, at regular intervals corresponding at least to the width of a bag, for example one or two bag widths;
  • g) arranging inside said folded sheet two strips of non-elastic material, in line with said cut portions on each face of the sheet so that each non-elastic strip is housed inside a fold;
  • h) heat-welding the folds parallel to the longitudinal direction, to form a sheath in which is accommodated each non-elastic tape, the elastic tape overlapping at least partially the remaining skirt portion of the fold.

L'invention sera mieux comprise, et d'autres buts, détails, caractéristiques et avantages de celle-ci apparaîtront plus clairement au cours de la description suivante de plusieurs modes de réalisation particuliers de l'invention, donnés uniquement à titre illustratif et non limitatif, en référence aux dessins annexés sur lesquels :

  • la figure 1 est une vue en élévation et en perspective d'un premier mode de réalisation d'un sac selon l'invention, à bande élastique et à lien coulissant non-élastique ;
  • la figure 2 est vue en coupe suivant la ligne II-II de la figure 1, en position ouverte du sac ;
  • la figure 3 est une vue partiellement arrachée et en perspective d'un deuxième mode de réalisation du sac selon l'invention monté sur le col d'un récipient, avant la mise en tension de la bande élastique;
  • la figure 4 est une vue analogue à la figure 3, mais représentant la bande élastique en cours d'allongement ;
  • la figure 5 est une vue analogue à la figure 4, mais représentant la bande élastique en position finale de maintien élastique sur le bord opposé du récipient ;
  • la figure 6 est une vue en élévation d'un troisième mode de réalisation du sac selon l'invention, comportant une bande élastique externe ;
  • la figure 7 est une vue analogue à la figure 6, mais représentant un quatrième mode de réalisation du sac selon l'invention, dans lequel la bande élastique est découpée en deux brins ;
  • la figure 8 est une vue schématique représentant le sac de la figure 1 dans une position de fermeture du sac, le lien coulissant plastique prêt à être noué ;
  • la figure 9 est une vue partiellement arrachée et en perspective d'une étape du procédé de fabrication d'une chaîne de sacs selon le premier mode de réalisation de l'invention; et
  • la figure 10 est une vue analogue à la figure 1, mais représentant un cinquième mode de réalisation du sac selon l'invention, sans lien coulissant plastique.
The invention will be better understood, and other objects, details, characteristics and advantages thereof will appear more clearly in the course of the following description of several particular embodiments of the invention, given solely for illustrative and non-limiting purposes. with reference to the accompanying drawings, in which:
  • Figure 1 is an elevational view in perspective of a first embodiment of a bag according to the invention, elastic band and non-elastic sliding link;
  • Figure 2 is a sectional view along the line II-II of Figure 1, in the open position of the bag;
  • Figure 3 is a partially cutaway view in perspective of a second embodiment of the bag according to the invention mounted on the neck of a container, before the tensioning of the elastic band;
  • Figure 4 is a view similar to Figure 3, but showing the elastic band during elongation;
  • Figure 5 is a view similar to Figure 4, but showing the elastic band in the final position of elastic holding on the opposite edge of the container;
  • Figure 6 is an elevational view of a third embodiment of the bag according to the invention, comprising an external elastic band;
  • Figure 7 is a view similar to Figure 6, but showing a fourth embodiment of the bag according to the invention, wherein the elastic band is cut into two strands;
  • Figure 8 is a schematic view showing the bag of Figure 1 in a closed position of the bag, the sliding plastic link ready to be tied;
  • Figure 9 is a partially cutaway and perspective view of a step of the method of manufacturing a bag chain according to the first embodiment of the invention; and
  • Figure 10 is a view similar to Figure 1, but showing a fifth embodiment of the bag according to the invention without sliding plastic link.

Dans le premier mode de réalisation illustré sur les figures 1 et 2, on voit que le sac 1 selon l'invention est constitué de deux faces sensiblement parallèles 1a, 1b rectangulaires, les faces 1a, 1b étant constituées par une même feuille de matière plastique qui est pliée pour former le fond 1c du sac, ce fond 1c étant arrondi lorsque le sac est en position de portage, comme cela est représenté sur la figure 2. Dans la position de stockage, les faces 1a et 1b sont ramenées l'une contre l'autre et se raccordent au niveau du fond 1c par un pli plat, comme représenté sur la figure 1. Sur leurs bordures latérales 2 et 3, les faces 1a et 1b sont reliées entre elles par des soudures correspondantes 2a et 3a. Ces soudures 2a et 3a s'étendent sensiblement sur toute la hauteur du sac 1 et forment une ligne verticale, mais ces soudures pourraient ne pas être linéaires mais s'étendre sur toute la zone marginale latérale du sac.In the first embodiment illustrated in FIGS. 1 and 2, it can be seen that the bag 1 according to the invention consists of two substantially parallel rectangular faces 1a, 1b, the faces 1a, 1b being constituted by the same sheet of plastics material. which is folded to form the bottom 1c of the bag, the bottom 1c being rounded when the bag is in the carrying position, as shown in Figure 2. In the storage position, the faces 1a and 1b are brought back one against the other and are connected at the bottom 1c by a flat fold, as shown in Figure 1. On their side edges 2 and 3, the faces 1a and 1b are interconnected by corresponding welds 2a and 3a. These welds 2a and 3a extend substantially over the entire height of the bag 1 and form a vertical line, but these welds may not be linear but extend over the entire lateral marginal zone of the bag.

Du côté opposé au fond 1c, la périphérie du sac comporte une zone d'ouverture 1d définie le long du bord longitudinal de chaque face 1a et 1b, le bord longitudinal de chaque face 1a et 1b se prolongeant, au niveau de la zone d'ouverture 1d, par un repli interne 4, dont une extrémité est soudée sur la face correspondante du sac par une soudure longitudinale 4a. Ce repli 4 se prolonge au-delà de la soudure longitudinale 4a par une jupe 4b, qui peut être libre ou bien elle-même soudée à la face correspondante du sac.On the opposite side to the bottom 1c, the periphery of the bag comprises an opening zone 1d defined along the longitudinal edge of each face 1a and 1b, the longitudinal edge of each face 1a and 1b extending at the level of the zone of opening 1d, by an inner fold 4, one end of which is welded to the corresponding face of the bag by a longitudinal weld 4a. This fold 4 extends beyond the longitudinal weld 4a by a skirt 4b, which may be free or itself welded to the corresponding face of the bag.

La soudure longitudinale 4a est de préférence continue sur toute la largeur du sac. Elle peut aussi être non continue, en trait interrompu ou en pointillés.The longitudinal weld 4a is preferably continuous over the entire width of the bag. It can also be non-continuous, in broken lines or in dashed lines.

Dans le mode de réalisation représenté sur les figures 1 et 2, on voit que le repli interne 4 forme une gaine 8 dans laquelle est disposé un lien coulissant non-élastique 6. Sur la jupe 4b de la face la du sac, est disposée une bande en matériau élastique 16, qui est reliée aux bordures latérales 2 et 3 par les lignes de soudure transversales 2a et 3a. Comme mieux visible sur la figure 2, la bande élastique 16 chevauche complètement la jupe 4b, sans toutefois interférer avec la gaine 8, afin que le lien coulissant non-élastique, par exemple en plastique, puisse librement coulisser entre ses extrémités qui sont également soudées avec les soudures transversales 2a et 3a. Le bord inférieur de la bande élastique 16 peut dépasser ou correspondre exactement au bord inférieur de la jupe 4b. La bande élastique 16 présente une zone de liaison dite intermédiaire 17 avec la face 1a du sac, qui est constituée par une ligne verticale de soudure ou collage ou autre, cette ligne 17 étant limitée à la hauteur de la bande 16. Avantageusement, la bande élastique 16 chevauche la soudure longitudinale 4a, sans toutefois interférer avec le lien coulissant 6, afin que les efforts de traction qui s'exercent au niveau de la ligne 17 soient repris par la soudure 4a, renforçant ainsi la résistance de la ligne 17 à la déchirure. Bien entendu, en variante, chaque face du sac pourrait comporter une bande élastique.In the embodiment shown in Figures 1 and 2, we see that the inner fold 4 forms a sheath 8 in which is disposed a non-elastic sliding link 6. On the skirt 4b of the face of the bag, is disposed a strip of elastic material 16, which is connected to the side edges 2 and 3 by the transverse weld lines 2a and 3a. As best seen in Figure 2, the elastic band 16 completely overlaps the skirt 4b, without interfering with the sheath 8, so that the non-elastic sliding link, for example plastic, can freely slide between its ends which are also welded with the transverse welds 2a and 3a. The lower edge of the elastic band 16 may exceed or exactly correspond to the lower edge of the skirt 4b. The elastic band 16 has a so-called intermediate connection zone 17 with the face 1a of the bag, which consists of a vertical line of welding or gluing or the like, this line 17 being limited to the height of the strip 16. Advantageously, the strip elastic 16 overlaps the longitudinal weld 4a, without interfering with the sliding link 6, so that the tensile forces exerted on the line 17 are taken up by the weld 4a, thereby reinforcing the strength of the line 17 to the tear. Of course, alternatively, each side of the bag could comprise an elastic band.

Sur les figures 1 et 2, on a représenté un embrèvement 12, sensiblement dans la partie médiane de chaque gaine 8, le long du bord longitudinal de l'ouverture du sac, l'embrèvement 12 traversant les faces 1a et 1b du sac, de chaque côtéde celui-ci. Cet embrèvement est représenté ici de forme sensiblement semi-circulaire, mais il pourrait avoir une forme quelconque, par exemple ovale ou carrée, ou autre, et il n'est pas nécessaire que le lien coulissant 6 soit apparent sur toute sa hauteur à travers l'embrèvement 12. Cet embrèvement 12 peut être prévu latéralement, de manière sensiblement analogue à l'embrèvement 112 qui sera décrit plus loin en référence aux modes de réalisation des figures 6 et 7.In FIGS. 1 and 2, there is shown a recess 12, substantially in the middle part of each sheath 8, along the longitudinal edge of the opening of the bag, the recess 12 passing through the faces 1a and 1b of the bag, each side of it. This recess is represented here of substantially semicircular shape, but it could have any shape, for example oval or square, or other, and it is not necessary that the sliding link 6 is apparent throughout its height through the 12. This recess 12 may be provided laterally, substantially similar to the recess 112 which will be described later with reference to the embodiments of Figures 6 and 7.

La fonction principale de la bande élastique 16 est de permettre d'ajuster de manière élastique la périphérie du sac sur le bord d'un réceptacle, alors que le lien non-élastique 6 sera utilisé principalement pour porter le sac une fois rempli de déchets et/ou pour nouer les liens 6 en vue de la fermeture du sac (voir figure 8). Compte tenu de la disposition du lien 6 et de la bande 16, on comprend qu'à la fermeture le sac sera complètement fermé, évitant ou limitant le risque de chute des déchets hors du sac lors de son transport ou de son stockage. Lors du transport du sac plein, c'est l'autre lien en matière plastique 6 qui est utilisé pour éviter la déformation de la bande élastique.The main function of the elastic band 16 is to allow the periphery of the bag to be elastically adjusted to the edge of a receptacle, whereas the non-elastic tie 6 will be used mainly to carry the bag once filled with waste and / or to tie the links 6 to close the bag (see Figure 8). Given the provision of the link 6 and the band 16, it is understood that closing the bag will be completely closed, avoiding or limiting the risk waste falling out of the bag during transport or storage. When transporting the full bag, it is the other plastic link 6 which is used to prevent deformation of the elastic band.

Sur la figure 2, on a indiqué par le chiffre de référence I l'intérieur du sac, en position ouverte.In FIG. 2, the reference numeral I indicates the inside of the bag, in the open position.

La bande élastique 16 est disposée sur toute la largeur du sac, d'une bordure latérale 2 à l'autre 3, dans un état tendu mais non élastiquement allongé lorsque le sac est à plat, pour éviter tout fronçage du sac. La ligne de soudure limitée 17 est effectuée au voisinage d'une bordure latérale 3 du sac, de façon que la portion préhensible de l'extérieur et élastiquement déformable de la bande 16 soit celle comprise entre la ligne 17 et la bordure latérale opposée 2 la plus éloignée. Ainsi, l'écartement L2 entre les deux soudures 2a et 17 sur la bande élastique 16 est sensiblement inférieur à la longueur L1 entre les soudures des deux bordures latérales 2 et 3 du sac, ce qui permet de réaliser une bande élastique ayant une longueur utile au repos inférieure à celle de l'ouverture du sac. A titre d'exemple non limitatif, on peut prévoir pour un sac ayant une capacité de contenance de 30 litres et une longueur L1 égale à environ 50 cm (demi-périmètre) que la zone de liaison 17 soit disposée de façon à obtenir un écartement L2 de l'ordre de 34 cm. Ainsi, pour le maintien du sac sur une poubelle ayant un périmètre de l'ordre de 1 mètre, il est nécessaire d'allonger la bande élastique de 34 cm à 66 cm, en retournant la bande sur le côté de la poubelle opposé à celui où est initialement disposée la bande, ce qui correspond à un degré d'allongement élastique de l'ordre de 94 %. En pratique, il est souhaitable que le matériau soit choisi avec un degré d'allongement élastique légèrement supérieur pour faciliter la mise en place de la bande sur le côté opposé du récipient. Généralement, le degré d'allongement élastique nécessaire reste inférieur à 150 % et est de préférence de l'ordre de 100 %. Ainsi, la longueur L2 peut être avantageusement choisie de l'ordre de 2/3 de L1.The elastic band 16 is disposed over the entire width of the bag, from one side edge 2 to the other 3, in a stretched but not elastically elongated state when the bag is flat, to prevent any crimping of the bag. The limited weld line 17 is made in the vicinity of a lateral edge 3 of the bag, so that the gripping portion of the outside and elastically deformable of the strip 16 is that between the line 17 and the opposite lateral edge 2 la further away. Thus, the spacing L2 between the two welds 2a and 17 on the elastic band 16 is substantially smaller than the length L1 between the welds of the two side edges 2 and 3 of the bag, which makes it possible to produce an elastic band having a useful length at rest less than that of the opening of the bag. By way of nonlimiting example, provision can be made for a bag having a capacity of 30 liters and a length L1 equal to about 50 cm (half-perimeter) that the connecting zone 17 is arranged so as to obtain a spacing L2 of the order of 34 cm. Thus, to maintain the bag on a bin having a perimeter of the order of 1 meter, it is necessary to lengthen the elastic band from 34 cm to 66 cm, turning the band on the side of the trash opposite to that where is initially arranged the band, which corresponds to a degree of elastic elongation of the order of 94%. In practice, it is desirable that the material be selected with a slightly higher degree of elastic elongation to facilitate placement of the web on the opposite side of the container. Generally, the degree of elastic elongation required remains less than 150% and is preferably of the order of 100%. Thus, the length L2 may advantageously be chosen on the order of 2/3 of L1.

Avantageusement, le lien 6 et la bande 16 sont de couleur différente de la couleur de la feuille constitutive des faces 1a et 1b et le lien et la bande peuvent eux-mêmes se distinguer par des couleurs différentes.Advantageously, the link 6 and the band 16 are different in color from the color of the sheet constituting the faces 1a and 1b and the link and the band can themselves be distinguished by different colors.

A titre d'exemple, la bande 16 en matériau élastique, par exemple en acétate de vinyle éthylène (EVA) est choisie de façon à permettre un degré d'allongement élastique inférieur à 150 %. L'autre lien 6 non-élastique est, par exemple, en matériau plastique, par exemple en polyéthylène haute densité.By way of example, the strip 16 made of elastic material, for example ethylene vinyl acetate (EVA), is chosen so as to allow a degree of elastic elongation of less than 150%. The other non-elastic link 6 is, for example, plastic material, for example high density polyethylene.

Sur la figure 2, on a représenté la bande élastique 16 dans un état légèrement détendu à l'intérieur du sac en position ouverte I, c'est à dire dans une position dans laquelle la bande élastique 16 n'est plus nécessairement en contact, notamment dans sa partie médiane, avec la paroi interne en vis-à-vis du sac. Ainsi, l'utilisateur peut aisément, de l'extérieur, saisir la bande élastique 16 en introduisant sa main à travers l'ouverture 1d.FIG. 2 shows the elastic band 16 in a slightly relaxed state inside the bag in the open position I, ie in a position in which the elastic band 16 is no longer necessarily in contact, in particular in its middle part, with the inner wall vis-à-vis the bag. Thus, the user can easily, from the outside, seize the elastic band 16 by introducing his hand through the opening 1d.

Dans les modes de réalisation illustrés sur les figures 3 et suivantes, les mêmes chiffres de référence désigneront des éléments identiques ou analogues.In the embodiments illustrated in Figures 3 and following, the same reference numerals will designate identical or similar elements.

Dans le deuxième mode de réalisation illustré sur les figures 3 à 5, le sac se distingue de celui illustré sur les figures 1 et 2 essentiellement par le fait que la bande élastique 16 est reliée à la jupe 4b par deux zones de liaison intermédiaires 17 et 17', qui sont symétriques l'une de l'autre par rapport à un plan passant par les embrèvements médians 12. Bien entendu, les deux zones de liaison intermédiaire 17 et 17' pourraient être disposées à des distances différentes des bordures latérales respectives 3a et 2a, sans sortir du cadre de l'invention. L'écartement L2 est donc ici défini entre les zones 17 et 17'. A titre d'exemple, pour un sac de 30 litres ayant une longueur L1 égale à 500 mm, on peut prévoir les zones 17 et 17' de façon à obtenir un écartement L2 égal à 34 cm, chaque zone 17, 17' étant espacée de sa bordure latérale correspondante 3 et 2 d'environ 8 cm respectivement. Dans ce deuxième mode de réalisation, la bande élastique 16 est entièrement disposée sur la jupe 4b, alors que dans le premier mode de réalisation, la bande élastique dépassait de part et d'autre de la jupe.In the second embodiment illustrated in FIGS. 3 to 5, the bag differs from that illustrated in FIGS. 1 and 2 essentially in that the elastic band 16 is connected to the skirt 4b by two intermediate connection zones 17 and 17 ', which are symmetrical to each other with respect to a plane passing through the median recesses 12. Of course, the two intermediate connection zones 17 and 17' could be arranged at different distances from the respective lateral edges 3a and 2a, without departing from the scope of the invention. The distance L2 is here defined between the zones 17 and 17 '. By way of example, for a bag of 30 liters having a length L1 equal to 500 mm, zones 17 and 17 'can be provided so as to obtain a distance L2 equal to 34 cm, each zone 17, 17' being spaced apart. of its corresponding lateral border 3 and 2 of about 8 cm respectively. In this second embodiment, the elastic band 16 is entirely arranged on the skirt 4b, while in the first embodiment, the elastic band protruded on either side of the skirt.

Lorsque le sac est positionné sur un récipient R, de section rectangulaire, carrée, circulaire ou autre, le rebord du sac au niveau de son ouverture est rabattu sur le bord périphérique du récipient, comme visible sur la figure 3, ce qui fait avantageusement apparaître la bande élastique 16 qui est désormais orientée vers l'extérieur de la paroi externe du récipient. Lorsque la bande élastique est disposée sur la paroi externe du sac, comme décrit plus loin en référence aux figures 6 et 7, la bande élastique est alors cachée entre la paroi externe du récipient et le rebord rabattu du sac, mais l'utilisateur peut aisément saisir la bande élastique en glissant sa main entre le rebord rabattu du sac et la paroi extérieure du récipient pour le tirer vers le bas et le rabattre de l'autre côté du récipient.When the bag is positioned on a container R of rectangular, square, circular or other section, the rim of the bag at its opening is folded over the peripheral edge of the container, as shown in Figure 3, which makes it advantageously appear the elastic band 16 which is now oriented towards the outside of the outer wall of the container. When the elastic band is disposed on the outer wall of the bag, as described below with reference to Figures 6 and 7, the elastic band is then hidden between the outer wall of the container and the folded edge of the bag, but the user can easily seize the elastic band by sliding its hand between the folded edge of the bag and the outer wall of the container to pull it down and fold down the other side of the container.

Sur la figure 4, la bande élastique est représentée au cours de son allongement par l'utilisateur, avant qu'il ne la rabatte du côté opposé au récipient, comme représenté sur la figure 5.In Figure 4, the elastic band is shown during its elongation by the user, before it folds the side opposite the container, as shown in Figure 5.

Sur la figure 3, la bande élastique est au repos, alors que sur la figure 5 la bande élastique est dans son état élastiquement allongé, ce qui engendre une force élastique suffisante de maintien du sac sur le récipient R. Il n'est pas nécessaire que cette bande élastique soit allongée jusqu'à former une boucle fermée permettant d'enserrer toute la périphérie du récipient.In Figure 3, the elastic band is at rest, while in Figure 5 the elastic band is in its elastically elongated state, which generates a sufficient elastic force holding the bag on the container R. It is not necessary that this elastic band is elongated to form a closed loop for gripping the entire periphery of the container.

Dans le troisième mode de réalisation illustré sur la figure 6, le sac 101 se distingue essentiellement du sac 1 précité par le fait que l'embrèvement médian 12 est optionnel, au moins un embrèvement latéral 112 étant prévu pour donner l'accès de l'extérieur au lien coulissant non-élastique 106. Ce lien coulissant non-élastique 106 est soudé à une extrémité avec la bordure latérale 2 du sac, le long de la ligne de soudure 2a, alors que les extrémités opposées du lien non-élastique 106 sont soudées ensemble le long d'une soudure 107 qui est réalisée à travers l'embrèvement 112, de sorte que cette extrémité du lien non-élastique 106 n'est pas liée à la bordure latérale 3 du sac. Cette variante de lien coulissant non-élastique est connue en soi.In the third embodiment illustrated in FIG. 6, the bag 101 differs essentially from the aforementioned bag 1 in that the median recess 12 is optional, at least one lateral recess 112 being provided to give the access of the external to the non-elastic sliding link 106. This non-elastic sliding link 106 is welded at one end to the lateral edge 2 of the bag, along the weld line 2a, while the opposite ends of the non-elastic link 106 are welded together along a weld 107 which is made through the recess 112, so that this end of the non-elastic link 106 is not tied to the side edge 3 of the bag. This non-elastic sliding link variant is known per se.

Bien entendu, le sac 101 pourrait avoir deux embrèvements latéraux pour la préhension du lien plastique 106, sans sortir du cadre de la présente invention. Chaque embrèvement latéral 112 peut avoir une forme quelconque, notamment en quart de cercle, en quart d'ellipse ou rectangulaire.Of course, the bag 101 could have two lateral recesses for gripping the plastic link 106, without departing from the scope of the present invention. Each lateral recess 112 may have any shape, including quarter-circle, quarter-ellipse or rectangular.

Le sac 101 diffère également par le fait que la bande élastique 116 est fixée sur la paroi externe de la face 1a du sac, son bord supérieur étant situé légèrement au-dessus de la ligne 4a précitée, alors que son bord inférieur est situé au-dessus du bord inférieur de la jupe 4b. Ainsi, la bande élastique 116 chevauche partiellement la jupe 4b et la portion du repli 4 formant la gaine pour le lien coulissant 106, sans que le lien 106 et la bande 116 ne puissent être superposés.The bag 101 also differs in that the elastic band 116 is fixed on the outer wall of the bag face 1a, its upper edge being situated slightly above the above-mentioned line 4a, while its lower edge is situated above the lower edge of the skirt 4b. Thus, the elastic band 116 partially overlaps the skirt 4b and the portion of the fold 4 forming the sheath for the sliding link 106, without the link 106 and the strip 116 can not be superimposed.

L'utilisation du sac 101 est sensiblement analogue à celle du sac 1, comme décrit en référence aux figures 3 à 5.The use of the bag 101 is substantially similar to that of the bag 1, as described with reference to Figures 3 to 5.

Dans le quatrième mode de réalisation illustré sur la figure 7, la bande élastique est découpée ou fendue longitudinalement en deux brins distincts 116a et 116b, verticalement adjacents et disposés, par exemple, sur la paroi externe de la face 1a du sac. Lors de la mise en place du sac sur un récipient, le brin 116a peut rester, à titre d'exemple, sur la face 1a du sac, sans allongement, alors que l'autre brin 116b est allongé pour venir enserrer l'autre côté du récipient, de manière analogue à la bande 16 précitée. Dans cette position, on peut considérer que les deux brins 116a et 116b forment avec le sac 101 une boucle sensiblement fermée autour du récipient. En outre, la zone de liaison intermédiaire 117b qui est soumise à une forte sollicitation est localement renforcée par la présence de la soudure intermédiaire 117a de l'autre brin 116a.In the fourth embodiment illustrated in Figure 7, the elastic band is cut or split longitudinally into two separate strands 116a and 116b, vertically adjacent and arranged, for example, on the outer wall of the face 1a of the bag. When placing the bag on a container, the strand 116a can remain, for example, on the side 1a of the bag, without elongation, while the other strand 116b is elongated to grip the other side of the container, in a similar manner to the aforementioned strip 16. In this position, it can be considered that the two strands 116a and 116b form with the bag 101 a substantially closed loop around the container. In addition, the intermediate connection zone 117b which is subjected to high stress is locally enhanced by the presence of the intermediate weld 117a of the other strand 116a.

Sur les figures 6 et 7, on a représenté en traits interrompus l'embrèvement médian supplémentaire 12, donnant ainsi accès au lien non-élastique 106. Toutefois, un tel embrèvement médian 12 n'est pas nécessaire, car l'utilisateur peut déjà accéder au lien non-élastique 106 par l'embrèvement latéral 112.In FIGS. 6 and 7, there is shown in broken lines the additional median recess 12, thus giving access to the non-elastic link 106. However, such a median recess 12 is not necessary because the user can already access at the non-elastic connection 106 by the lateral recess 112.

On va maintenant se référer plus particulièrement à la figure 9 qui représente une étape d'un procédé de fabrication en continu d'une chaîne de sacs dont peut être issu le sac 1 précité.We will now refer more particularly to Figure 9 which shows a step of a continuous manufacturing process of a bag chain from which can be derived the aforementioned bag 1.

Comme cela est décrit plus en détail dans le brevet EP 1 232 954, pour commencer, on fait défiler sur une machine, non représentée, un fourreau continu de film en matière plastique, par exemple en polyéthylène, que l'on vient découper longitudinalement en son centre pour obtenir deux demi fourreaux séparés.As described in more detail in the patent EP 1 232 954, to begin, is scrolled on a machine, not shown, a continuous sheath of plastic film, for example polyethylene, which is cut longitudinally in its center to get two separate half-sleeves.

Puis, sur chaque demi fourreau, des portions circulaires ou elliptiques sont découpées à des intervalles réguliers correspondant à une fois la largeur d'un sac (ou bien à deux fois la largeur d'un sac si un seul embrèvement latéral est prévu par sac), afin de former des embrèvements 12 semi-circulaires ou semi-elliptiques après repliage du bord longitudinal de la feuille 20 du demi fourreau vers l'intérieur, comme représenté sur la figure 9.Then, on each half sleeve, circular or elliptical portions are cut at regular intervals corresponding to one bag width (or twice the width of a bag if only one lateral recess is provided per bag) to form semi-circular or semi-elliptical recesses 12 after folding the edge longitudinally of the sheet 20 of the half sleeve inwards, as shown in FIG. 9.

Bien entendu, la forme de la découpe peut être quelconque, par exemple carrée, rectangulaire ou autre.Of course, the shape of the blank can be any, for example square, rectangular or other.

Ensuite, un ruban plastique 6 est introduit à l'intérieur de chaque repli 4, avant de le fermer par une thermo-soudure longitudinale pour constituer la gaine. Puis, un ruban élastique 16 est introduit dans le fourreau, le long du bord libre du repli 4, en le chevauchant au moins partiellement.Then, a plastic tape 6 is introduced inside each fold 4, before closing by a longitudinal heat seal to form the sheath. Then, an elastic band 16 is introduced into the sheath along the free edge of the fold 4, overlapping it at least partially.

Bien entendu, on pourrait tout à fait inverser les opérations, en disposant d'abord le ruban élastique 16 et en thermo-soudant ensuite le repli 4 pour former la gaine.Of course, one could quite reverse the operations, by first disposing the elastic tape 16 and then heat-sealing the fold 4 to form the sheath.

Le procédé est le même dans les deux cas ; le bord interne du repli est thermo-soudé (suivant une ligne 4a) sur chaque face de la feuille 20 pour constituer les gaines, dans la direction de défilement F.The process is the same in both cases; the inner edge of the fold is heat-welded (along a line 4a) on each face of the sheet 20 to form the sheaths, in the direction of movement F.

Puis, à intervalles réguliers correspondant à la largeur d'un sac, des paires de thermo-soudures 2a et 3a sont effectuées sensiblement à mi-distance entre les découpes semi-circulaires ou semi-elliptiques. Chaque paire de thermo-soudures 2a ou 3a est telle que l'on puisse ensuite séparer les sacs individuels par découpage transversal ou par pré-découpe entre les thermo-soudures de chaque paire.Then, at regular intervals corresponding to the width of a bag, pairs of thermo-welds 2a and 3a are made substantially halfway between the semi-circular or semi-elliptical cuts. Each pair of thermo-welds 2a or 3a is such that the individual bags can then be separated by transverse cutting or by pre-cutting between the heat-welds of each pair.

La machine effectue également des thermo-soudures transversales 17 limitées à la portion correspondant au ruban élastique 16 pour constituer les zones de liaison intermédiaires précitées limitant la longueur utile au repos de la bande élastique.The machine also performs transverse heat-sealing 17 limited to the portion corresponding to the elastic tape 16 to form the aforementioned intermediate bonding areas limiting the effective length at rest of the elastic band.

Bien entendu, l'ordre des étapes de réalisation des thermo-soudures 4a, 2a et 3a, et 17 peut être modifié, sans sortir du cadre de l'invention.Of course, the order of the steps of making the heat welds 4a, 2a and 3a, and 17 can be modified, without departing from the scope of the invention.

On va maintenant décrire un cinquième mode de réalisation en référence à la figure 10 sur laquelle est représenté un sac 201 qui se distingue essentiellement des sacs précédents par le fait qu'il ne comporte pas de lien coulissant non-élastique, le sac 201 comportant simplement une bande élastique 216 le long d'une face 1b du sac, à l'intérieur comme représenté, ou bien à l'extérieur. De préférence, ce sac 201 comporte également un repli interne 4, dont le bord interne inférieur 4a n'est pas nécessairement soudé au reste du sac, en dehors des bordures latérales 2 et 3. Ainsi, la bande élastique 216 est disposée au droit de ce repli interne 4, de façon que la soudure transversale limitée 217, située entre les soudures latérales 2a et 3a, soit renforcée par la double épaisseur de matière au niveau du repli 4.A fifth embodiment will now be described with reference to FIG. 10, on which is represented a bag 201 which differs essentially from the preceding bags in that it does not comprise a non-elastic sliding link, the bag 201 simply comprising an elastic band 216 along a face 1b of the bag, inside as shown, or outside. Preferably, this bag 201 also comprises an internal fold 4, whose lower inner edge 4a is not necessarily welded to the rest of the bag, outside the borders 2 and 3. Thus, the elastic band 216 is disposed at the right of this inner fold 4, so that the limited transverse seam 217, located between the side welds 2a and 3a, is reinforced by the double thickness of material at the level of the withdrawal 4.

Bien entendu, les autres variantes de réalisation de la bande élastique illustrées en référence aux figures 1 à 9, sont applicables au sac 201 dépourvu de lien coulissant plastique. En particulier, la bande élastique 216 pourrait être découpée en deux brins comme sur la figure 7, ou bien prévue à l'extérieur comme sur la figure 6, ou bien comporter deux zones de liaison intermédiaires comme sur les figures 3 à 5. De manière analogue, le chevauchement entre le repli et la bande élastique peut être total ou partiel comme illustré sur les autres figures.Of course, the other embodiments of the elastic band illustrated with reference to Figures 1 to 9, are applicable to the bag 201 devoid of sliding plastic link. In particular, the elastic band 216 could be cut into two strands as in FIG. 7, or else provided outside as in FIG. 6, or could comprise two intermediate connection zones as in FIGS. Likewise, the overlap between the fold and the elastic band may be total or partial as illustrated in the other figures.

Bien que l'invention ait été décrite en liaison avec plusieurs modes de réalisation particuliers, il est bien évident qu'elle n'y est nullement limitée et qu'elle comprend tous les équivalents techniques des moyens décrits ainsi que leurs combinaisons si celles-ci entrent dans le cadre de l'invention.Although the invention has been described in connection with several particular embodiments, it is obvious that it is not limited thereto and that it comprises all the technical equivalents of the means described and their combinations if they are within the scope of the invention.

Claims (14)

  1. A bag (1, 101, 201) consisting of two faces (1a, 1b) joined together around their whole periphery, with the exception of one longitudinal edge, the bag having an opening (1d) emerging at said longitudinal edge, the two faces of the bag being welded to one another along two opposite lateral edges (2, 3), at least one face having, near said opening, at least one elastic band (16, 116, 216) joined to said face by two connection regions (17, 117, 217; 2a, 17') in such a way that the effective relaxed length (L2) of said elastic band between the two connection regions corresponds to the gap between the two connection regions on the bag and is shorter than the length (L1) of the longitudinal edge of said face of the bag, characterized in that the elastic band (16, 116, 216) extends across the whole width of the bag, from one lateral edge to the other, said elastic band being welded to the two faces of the bag along said lateral edges, at least one of the abovementioned two connection regions forming an "intermediate" connection region (17, 117, 217, 17') located at a distance from the abovementioned two lateral edges.
  2. The bag as claimed in claim 1, characterized in that each face of the bag (1, 101) comprises a hem (8) bordering said opening (1d), in which is placed a non-elastic drawstring (6, 106), it being possible for each non-elastic drawstring to be grasped from the outside via at least one notch (12, 112) made through said hems.
  3. The bag as claimed in claim 2, characterized in that each face of the bag (1, 101) is folded inward, along the longitudinal edge of the bag, in such a way that part of the fold (4) forms the abovementioned hem (8) and extends beyond it by a skirt (4b), said elastic band (16, 116) being joined to the corresponding face of the bag by overlapping said skirt at least partially.
  4. The bag as claimed in claim 1, characterized in that each face of the bag (201) associated with the elastic band (216) is folded inward along the longitudinal edge of the bag, in such a way that the elastic band is joined to said face, overlapping said fold (4) at least partially.
  5. The bag as claimed in one of claims 1 to 4, characterized in that the other of the abovementioned two connection regions forms another intermediate connection region (17') located at a distance from the abovementioned two lateral edges (2, 3) and from the first intermediate connection region (17).
  6. The bag as claimed in one of claims 1 to 4, characterized in that the other of the abovementioned two connection regions consists of the region where the elastic band is welded (2a) to the lateral edge (2) of the bag furthest from the abovementioned intermediate connection region (17, 117, 217).
  7. The bag as claimed in one of claims 1 to 6, characterized in that each elastic band (16, 216) is joined to an inside face of the bag (1, 101).
  8. The bag as claimed in one of claims 1 to 6, characterized in that each elastic band (116, 116a, 116b) is joined to an outer face of the bag (101).
  9. The bag as claimed in one of claims 1 to 8, characterized in that each elastic band is cut longitudinally into two vertically adjacent tapes (116a, 116b), whose respective connection regions (117a, 117b) lie in the vertical extension of one another, so that the two tapes form a closed loop with the bag, each tape of said loop being designed to extend around an opposite side of a container.
  10. The bag as claimed in one of claims 1 to 9, characterized in that the elastic band (6, 16, 116) has a degree of elongation of less than 150%, and preferably of around 100%.
  11. A method for the continuous production of a series of bags, said method comprising the steps consisting in:
    a) placing at least one elastic strip (16) inside a folded sheet (20), along one of the longitudinal edges of the sheet;
    b) making, at regular intervals corresponding to the width of a bag, at least one transverse heat weld (17) limited to the height of the elastic strip only, so as to form an intermediate connection region between the elastic strip and the corresponding inside face of the sheet;
    c) making, at regular intervals corresponding to the width of a bag, a plurality of pairs of adjacent transverse heat welds (2a, 3a) corresponding to the lateral edges of the bags, in such a way as to heat weld the abovementioned elastic strip to the lateral edges of the bags, said pairs of transverse heat welds being made at a distance from the abovementioned limited transverse heat welds (17);
    d) making pre-cuts, at regular intervals, on the sheet (20) between the transverse heat welds of each pair, to form a series of pre-cut bags.
  12. The method as claimed in claim 11, characterized in that it comprises the additional step of:
    e) before step a) or b), folding each longitudinal edge of the sheet inward to form an internal fold (4), the abovementioned elastic strip (16) being placed on a fold, with an at least partial overlap.
  13. The method as claimed in claim 12, characterized in that it comprises the additional steps, before step a), of:
    f) cutting portions of film (12) near the two longitudinal edges of the folded sheet (20), at regular intervals corresponding at least to the width of a bag, for example one or two bag widths;
    g) placing two non-elastic strips (6) inside said folded sheet, in line with said cut portions on each face of the sheet so that each non-elastic strip is housed inside a fold;
    h) heat welding the folds (4) parallel to the longitudinal direction (F), to form a hem in which each non-elastic strip is housed, the elastic strip at least partially overlapping the remaining portion of the fold which forms a skirt.
  14. A series of bags (1, 101, 201) comprising a plurality of bags attached by the lateral edges of said bags, said series of bags having a longitudinal direction corresponding to longitudinal edges of said bags, each bag consisting of two faces (1a, 1b) joined together around their whole periphery, with the exception of one longitudinal edge, the bag having an opening (1d) emerging at said longitudinal edge, the two faces of the bag being welded to one another along two opposite lateral edges (2, 3) of said bag, at least one face having, near said opening, at least one elastic band (16, 116, 216) joined to said face by two connection regions (17, 117, 217; 2a, 17') in such a way that the effective relaxed length (L2) of said elastic band between the two connection regions corresponds to the gap between the two connection regions on the bag and is shorter than the length (L1) of the longitudinal edge of said face of the bag, characterized in that the elastic band (16, 116, 216) extends continuously along the whole length of the series of bags (1, 101, 201), said elastic band being welded to the two faces of the bag along said lateral edges of said bag, at least one of the abovementioned two connection regions forming an "intermediate" connection region (17, 117, 217, 17') located at a distance from the abovementioned two lateral edges.
EP04787362A 2003-09-24 2004-09-13 Bag having an elastic band, and method for the production thereof Expired - Lifetime EP1675789B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0311208A FR2859982B1 (en) 2003-09-24 2003-09-24 ELASTIC BAND BAG AND METHOD FOR MANUFACTURING THE SAME
PCT/FR2004/002316 WO2005030612A1 (en) 2003-09-24 2004-09-13 Bag having an elastic band, and method for the production thereof

Publications (2)

Publication Number Publication Date
EP1675789A1 EP1675789A1 (en) 2006-07-05
EP1675789B1 true EP1675789B1 (en) 2007-01-03

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EP04787362A Expired - Lifetime EP1675789B1 (en) 2003-09-24 2004-09-13 Bag having an elastic band, and method for the production thereof

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US (1) US8556508B2 (en)
EP (1) EP1675789B1 (en)
AT (1) ATE350309T1 (en)
CA (1) CA2540267A1 (en)
DE (1) DE602004004173D1 (en)
ES (1) ES2281019T3 (en)
FR (1) FR2859982B1 (en)
WO (1) WO2005030612A1 (en)

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Publication number Publication date
ATE350309T1 (en) 2007-01-15
WO2005030612A1 (en) 2005-04-07
US20070036472A1 (en) 2007-02-15
ES2281019T3 (en) 2007-09-16
DE602004004173D1 (en) 2007-02-15
FR2859982A1 (en) 2005-03-25
FR2859982B1 (en) 2006-02-03
CA2540267A1 (en) 2005-04-07
EP1675789A1 (en) 2006-07-05
US8556508B2 (en) 2013-10-15

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