FR2859459A1 - Domestic filth and waste storage bag, has weld line whose top ends define length lower than length between lateral borders and line, so that elastic strip undergoes lengthening to maintain bag on top edge of receptacle - Google Patents

Abstract

The bag has a weld line (19) delimiting shrinkage areas and extending from lateral borders (2, 3) of the bag towards the inside of the bag. Top ends of the weld line define a length (L2) lower than the length (L1) between the lateral borders and the weld line, so that an elastic strip undergoes lengthening to maintain the bag on a top edge of a receptacle.

Description

2859459 i

  The present invention relates to a bag, especially plastic, in particular a garbage storage bag.

  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.

  The bags can be prepared from two rectangular plastic sheets 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.

  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.

  The sheath is generally prepared by folding the plastic sheet parallel to the opening and heat-sealing it 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.

  Such sliding link bags made of plastic are described in EP-953,511 and EP-1,232,954 patents belonging to the applicant.

  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 extensible 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.

  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.

  To overcome this drawback, the German utility model DE-202 07 942U1 provides recesses disposed in the vicinity and at a distance from the lateral edges of the bag, so that the elastic sliding links remain connected at their lateral ends to the lateral edges of the bag, the welds of the elastic links defining the rest length of the elastic links being accessible at said recesses. In such bags, the ends of the sliding links are no longer free, but connected to the side edges of the bag.

  However, all of these bags with elastic sliding link have the common disadvantage that the elastic link may not have sufficient tensile strength to withstand a large weight of waste in the bag, during transport. In addition, 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 drag the bag on the ground, or bring it down enough to stop against obstacles, which is a major inconvenience for the user. All these elastic tie bags also have the common disadvantage of not being able to be easily closed completely by their elastic link and thus to leave openings through which waste can escape.

  The object of the invention is therefore to propose a bag of the elastic ribbon type, in particular with an elastic sliding strip, making it possible to elastically fix the periphery of the bag on a receptacle, which makes it possible to avoid or limit the risks of falling waste outside. of the bag, after closing it. The invention also aims to avoid frowning the bag when the elastic band is at rest.

  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 an upper longitudinal edge, the bag having an opening opening on said upper longitudinal edge, the two faces of the bag being connected to each other along two opposite lateral edges, an elastic band being associated with each face of the bag and the strips being interconnected by at least one narrowing zone, so that the elastic bands form a loop whose useful length expandable at rest is less than that of the upper longitudinal edge of the bag, characterized in that each narrowing zone is delimited by a connecting line which extends substantially from a lateral edge of the bag towards the interior of the bag, and preferably towards the upper edge of the elastic band, so that the inner end of said connecting line delimits the it is useful for stretching the elastic ribbon. With this arrangement, the elastic band will exert, after elongation, an elastic restoring force on the edge of the receptacle of the trash, more important in the vicinity of its upper edge in the vicinity of its lower edge. In other words, the extensible effective length of the elastic band is, at rest, continuously variable and increasing from its lower edge to its upper edge. This narrowing zone extends between a vertical axis and a horizontal axis and its horizontal component makes it possible to have an upper opening zone of the elastic ribbon less than the opening zone at the bottom of the ribbon, and thus allows a maintenance of the bag on the container without frowning the bag at rest.

  Advantageously, the connecting line consists of a weld or glue line, inclined or curved upwards and towards the inside of the bag, starting from a lateral border of the bag. Preferably, the connecting line is substantially perpendicular to the direction of elongation of the elastic band, in the vicinity of the upper edge of the ribbon. Indeed, the constraints being maximum at the upper edge of the elastic band, it is desirable that the connecting line is substantially perpendicular to the direction of elongation at this point, to provide a larger surface of stress distribution.

  In a first embodiment, the lower peripheral edge of the elastic band is connected to the upper longitudinal edge of the bag, the elastic band extending freely beyond the opening of the bag.

  According to one characteristic, the elastic tape is connected to the inner face of the bag. In another variant, the elastic tape is connected to the outer face of the bag.

  Of course, the elastic tape can be connected continuously or discontinuously to the bag.

  Advantageously, the elastic tape is attached to the bag substantially all along its upper longitudinal edge, the ribbon can then be used as a sliding link for the knotting of the bag.

  In another variant, each side of the bag comprises a sheath bordering the opening of the bag and in which is arranged a nonelastic sliding link, each non-elastic link being grippable from the outside by at least one recess formed through said sleeves, said elastic tape being connected to said sheath.

  In a second embodiment, each side of the bag comprises a sheath bordering the opening of the bag and in which is arranged the elastic strip serving as a sliding link, at least one lateral recess being formed through said sheaths, in the vicinity of a side edge of the bag, such that said narrowing zone is disposed at said lateral recess, and that a portion of the elastic band below the lateral recess is connected to the adjacent lateral edge of the bag in said ducts.

  In this case, it can be provided that said connecting line is entirely accessible from the outside from the lateral recess.

  For example, the non-elastic link is high density polyethylene (HDPE), while the elastic band is ethylene vinyl acetate (EVA). However, other materials could be used: for the elastic tape, the materials indicated in US-5,133,607 could be used.

  The invention will be better understood, and other objects, details, features and advantages thereof will become more apparent in the following description of several particular embodiments of the invention, given for illustrative and non-illustrative purposes only. FIG. 1 is a perspective view of a partially open bag, according to a first embodiment of the invention; Figure 2 is a half-sectional view along the plane II-II of Figure 1; Figure 3 is an elevational view of the bag shown in Figure 1, showing on the left half-view a first variant and on the right half-view a second variant; Figure 4 is a view similar to Figure 3, but showing a second embodiment of the bag according to the invention; Figure 5 is a partial schematic and top view along arrow V of Figure 4; and Figure 6 is a view similar to Figure 1, but according to a third embodiment of the invention.

  In the first embodiment illustrated in FIGS. 1 to 3, it can be seen that the bag 1 according to the invention consists of two substantially parallel 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 la and lb are brought back one against the other io and are connected at the bottom 1c by a flat fold, as shown in Figure 3. On their side edges 2 and 3, the faces la and lb 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.

  On the opposite side to the bottom 1c, the periphery of the bag has 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 region of opening 1 d, by an inner fold 4, one end is welded to the corresponding face of the bag by a longitudinal weld 4a. This fold 4 may extend beyond the longitudinal weld 4a by a skirt, 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. It may even be absent, if the recesses for grasping the links are provided in 12 towards the middle of the edges of the bag.

  The welded fold 4 defines a sheath whose inner housing 5 receives a sliding link 6. This sliding link 6 is, for example, made of a strip of plastics material, generally of a color different from the color of the sheet constituting the faces of the and lb. The sliding links 6 are welded at their ends to the bag 1 at the side edges 2 and 3, simultaneously with the thermo-welding of the weld lines 2a and 3a. Each sliding link 6 is accessible from the outside, thanks to a recess 12 made in the walls of each sheath 4, for example substantially in the middle of the bag. For example, each recess 12 is obtained by cutting, in a circular form, the two walls of each fold 4. Of course, the recesses 12 may have any shape, for example rectangular or other.

  The link 6 is fixed to the sheath at a distance from the recess 12 and it is thus easier to pull the link 6 to cause the bag 1 to close, causing the sheath to fold at the level of the opening 1d. of the bag.

  Alternatively, instead of the central recesses 12, at least one lateral recess, for example semicircular, may be provided along the lateral edge of the bag, in a similar manner to the bags described in patents EP-953,511 and EP-953,511. 1,232,954 belonging to the applicant.

  The bag according to the invention further comprises an elastic band 16, in a closed loop, which extends essentially beyond the upper longitudinal edge of the bag 1 and which is welded or glued or otherwise attached thereto. last, on its outer face as shown in Figure 2, or on its inner face as shown in phantom 26 still in Figure 2. In practice, this elastic tape consists of two strands, each strand being associated with a face of bag and the two strands being connected together at their ends, in the extension of the lateral heat-sealing lines 2a and 3a, as shown in Figure 1 and indicated by the reference numeral 18. A connecting line, generally a line of inclined thermal welding 19 extends substantially from each side edge 2 and 3, in the vicinity of the junction zone between the elastic strip 16 and the bag 1, upwards and inwards of the bag, until at the top edge As can be seen more clearly in FIG. 1, when the bag is in the partially open position, the elastic band 16 has a substantially frustoconical shape. The portions of the elastic band between the heat seal lines 18 and 19 remain free and could be cut.

  In the embodiment illustrated in these figures, the elastic tape 16 is connected substantially continuously over the entire periphery of the upper edge of the bag, so that the ribbon 16 can not serve as a sliding link to tie the bag, but serves than the elastic hooking of the bag on a receptacle. For the knotting in order to close the bag, the non-elastic link 6 is then used.

  However, the invention is not limited to a bag having a non-elastic sliding link but can be applied to any conventional bag 201 without a sliding link, whose upper peripheral edge is connected in a similar manner to the aforementioned elastic band, as shown in Figure 6. This elastic tape can also be connected discontinuously to the peripheral edge of the bag without departing from the scope of the invention.

  The upper ends of the weld lines 19 define between them a length L2 less than the length L1 between the weld lines 2a and 3a of the lateral edges 2 and 3, so that the elastic link 16 can undergo an elastic elongation to maintain elastically. the bag on the top edge of a receptacle. Given the particular shape of the weld line 19, it is understood that the clamping force exerted by the elastic band 16 on the edge of the receptacle will be variable and increasing in the direction of the height of the elastic band.

  In the variants illustrated in FIG. 3, the weld line 49 shown on the half-view on the right also partially extends through the sheath 4 without affecting the operation of the invention.

  Conversely, as shown in the half-view on the left of FIG. 3, the weld line 59 may be entirely provided on the elastic strip 16, away from the bag 1. In addition, this weld line 59 may have a curved shape and not necessarily rectilinear, for example a quarter-elliptical shape, so that near the upper edge of the elastic ribbon 16 the weld line is substantially perpendicular to the elongation direction of the elastic band 16, to limit the risks tearing of the elastic tape at this weld.

  In Figure 2, there is shown by the reference numeral I the inside of the bag, in the open position.

  Of course, the various welding lines mentioned above may be continuous or discontinuous, without departing from the scope of the invention, and may be heat-sealing lines or ultrasonic welding or gluing or the like.

  In the second embodiment illustrated in FIGS. 4 and 5, the same reference numerals will designate identical or similar elements.

  The bag 101 of FIGS. 4 and 5 differs essentially from the bag 1 of FIGS. 1 to 3 by the sliding link 116 and its recesses 117. Indeed, the bag 101 here comprises two lateral recesses 117 whose longitudinal extension e of each is substantially greater than that of the heat-sealing 119 between the two strands of the elastic sliding link 116. Thus, the distance L2 between the upper end 119a of the two welds 119 on the sliding link 116 is substantially smaller than the length L1 between the two side edges 2 and 3 of the bag, which allows for a closed loop sliding link having a periphery of length less than that of the opening of the bag. As can be seen in FIG. 4, the free ends of the sliding link 116 may be welded at 118 in the extension of the weld lines 2a and 3a, but these welds 118 have no effect, since it is the welds 119 which define the useful extendable length. of the closed loop of the sliding link 116. Moreover, the ends of the sliding link 116 beyond the inclined welds 119 could be cut. In FIG. 4, there is shown, at the level of the left lateral recess, a curved weld 159 which could, alternatively, replace the weld 119.

  The sliding link 116 consists of two elastic strands, which makes it possible to lengthen the link 116, to conform it to the periphery of a receptacle, like a trash can, and to hold it elastically thereon.

  The ends of the sliding link 116 are also welded to the faces 1a, 1b of the bag, at the side edges 2 and 3, substantially on the lower half of the height of the link 116. The weld 119 or 159 of the two strands of the sliding link is found in the space cleared by the recess 117, for example semi-circular, semi-elliptical, or rectangular.

  To limit the risk that the sliding link 116 deforms elastically during transport, it can be expected that one of the two strands 116 is of plastic material, substantially non-elastic, while the other strand is of elastic material. Thus, the extensible character of the closed loop of the link 116 is preserved thanks to the presence of an elastic strand. During transport, it is the other plastic strand of the link 116 which ensures the non-deformation of the sliding link, provided of course that the user grasps the two ends of the non-elastic strand of the sliding link during transport . To facilitate the gripping of the sliding link 116 from the outside, it is possible to provide a central tab, represented in broken lines 112 in FIG. 4, through the sheaths 4.

  Similarly, the bag 1 could comprise two lateral recesses, while having a non-elastic link, whereas the bag 101 of FIG. 4 could have a single lateral recess while having at least one elastic link, without leaving the of the present 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. he

Claims (10)

  1. Bag (1, 101, 201) consisting of two faces (la, lb) interconnected over their entire periphery, except for an upper longitudinal edge, the bag having an opening (1d) opening on said edge s longitudinal upper, the two sides of the bag being connected to each other along two opposite side edges (2, 3), an elastic band (16, 116) being associated with each side of the bag and the ribbons being interconnected by at least one narrowing zone so that the elastic tapes form a loop whose extensible working length (L2) at rest is less than that (L 1) of the upper longitudinal edge of the bag, characterized in that each narrowing zone is delimited by a connecting line (19, 49, 59; 119, 159) which extends substantially from a lateral border (2, 3) of the bag towards the inside of the bag, so that the inner end (119a, 159a) of said connecting line delimits the lo Useful length extensible at rest of the elastic band.   2. Bag according to claim 1, characterized in that the connecting line consists of a weld line or gluing, inclined (19, 49, 119) or curved (59, 159) upwards and towards the end. inside the bag, starting from a lateral border (2, 3) of the bag.   3. Bag according to claim 2, characterized in that the connecting line (59, 159) is substantially perpendicular to the elongation direction of the elastic band (16, 116), in the vicinity of the upper edge of the ribbon.   4. Bag according to one of claims 1 to 3, characterized in that the lower peripheral edge of the elastic band (16) is connected to the upper longitudinal edge of the bag (1, 201), the elastic band extending freely to beyond the opening of the bag.   5. Bag according to claim 4, characterized in that the elastic tape (26) is connected to the inner face of the bag.   6. Bag according to claim 4, characterized in that the elastic tape (16) is connected to the outer face of the bag.   7. Bag according to one of claims 4 to 6, characterized in that the elastic tape (16) is fixed to the bag substantially all along its upper longitudinal edge.   8. Bag according to one of claims 4 to 7, characterized in that each side of the bag comprises a sheath (4) bordering the opening of the bag (1) and in which is disposed a non-elastic sliding link (6). ), each non-elastic link being grippable from the outside by at least one recess (12) formed through said sheaths, said elastic strip being connected to said sheath.   9. Bag according to one of claims 1 to 3, characterized in that each side of the bag (101) comprises a sheath (4) bordering the opening of the bag and in which is disposed the elastic strip (116) serving as sliding link, at least one lateral recess (117) being formed through said sleeves, in the vicinity of a lateral edge of the bag (2, 3), so that said narrowing zone is disposed at said lateral recess, and a portion of the elastic band under the lateral recess is connected to the adjacent side edge of the bag in said sleeves.   10. Bag according to claim 9, characterized in that 1s said connecting line (119, 159) is fully accessible from the outside from the lateral recess (117).