WO2015173343A1

WO2015173343A1 - Bag with bands fixed mechanically to the sheets

Info

Publication number: WO2015173343A1
Application number: PCT/EP2015/060673
Authority: WO
Inventors: Henri Bois; Philippe Georges; Stephen Buygnet
Original assignee: S2F Flexico
Priority date: 2014-05-15
Filing date: 2015-05-13
Publication date: 2015-11-19
Also published as: FR3021040B1; FR3021040A1

Abstract

The invention concerns a bag (100) comprising a first sheet (112) and a second sheet (114) that together form a first edge (117) and a second edge (118) of the bag, and a closing device (120), the closing device comprising: - a first channel (130) and a second channel (140) that extend between the edges, the first channel and the second channel each comprising a first end (132, 142) and a second end (133, 143), and - a first band (136) made from a non-fusible material, accommodated in the first channel (130), and a second band (146) made from a non-fusible material, accommodated in the second channel (140), the first band projecting from the first end (132) of the first channel and the second band projecting from the second end (144) of the second channel, the first band (136) being linked to the first channel (130) and the second band (146) being linked to the second channel (140) by welding.

Description

Ribbon bag mechanically attached to the leaves

FIELD OF THE INVENTION

The present invention relates to the field of sachets.

More specifically, the present invention relates to the field of bags whose closure is provided by pulling on ribbons or cords.

In the remainder of the description, the term "cord" or "ribbon" will be used interchangeably without this being considered as limiting. The term cord or tape as used in the context of the present patent application covers in particular any type of cord, tape, wire or equivalent means capable of fulfilling the function corresponding to the present invention.

STATE OF THE ART

Many bags have already been proposed comprising a closure cord.

For example, FIGS. 1 and 2 are shown respectively in a perspective view and in a cross-sectional view of a bag of this type known from the state of the art.

Appended FIG. 1 shows a bag 10 comprising two main sheets 12, 14.

The sheets 12 and 14 are generally rectangular and parallel to each other.

The sheets 12 and 14 are connected at a bottom 16 and two sides 17, 18 opposite each other, parallel to each other and perpendicular to the bottom 16, and an open mouth 19 opposite the bottom 16.

The bag 10 shown in Figure 1 further comprises near the mouth 19 two sets of parallel channels 30, 32 and 40, 42 respectively receiving a cord or closure tape 31, 33 and 41, 43. A first series of channels comprises two parallel channels 30, 32 adjacent the mouth 19 respectively on each of the two sheets 12, 14. A second series of channels comprises two other channels 40, 42 parallel to each other, respectively on each of the two sheets. 12, 14 set back from the mouth 19.

Each of the two channels 30, 32 of the aforementioned first series receives a strand of cord 31, 33. These two strands of cords 31, 33 are interconnected by nodes 35, 36 on both sides of the bag 10 on the outside of the bag 10.

Each of the channels 40, 42 of the second series receives a strand of cord 41, 43. The two strands 41, 43 are interconnected by nodes 45, 46 on either side of the bag 10, on the outside the bag.

By pulling on respective opposite ends of the two sets of drawstrings, for example by pulling in opposite directions respectively on the knots 35 and 46 as shown diagrammatically in FIG. 1 by the arrows referenced A and B, a tightening is obtained, then closing the mouth 19 of the bag 10.

In theory the cordet bags of the type illustrated in Figures 1 and 2 attached are of real interest insofar as they allow in principle a simple opening and a simple and reversible closure of the bags.

However, it is difficult to make these bags 10 simply and quickly. It is indeed necessary, on the manufacturing line to tie together the strands 31 and 33, 41 and 43 to make nodes. However, this knot requires the use of specific machines and slows the pace very strongly. Moreover, there is a significant risk of having to stop the manufacturing line at the knotters (which realize the knots on the strands).

It is also not possible to deliver sachets comprising strands 31, 33, 41, 43 not tied. Certainly the rate of manufacture of sachets could be significantly increased, but the strands would be likely to exit their respective channels 30, 32, 40, 42 when handling the bags 10.

But the field of drawstring bags has clearly been the subject of little remarkable innovation for many years.

Moreover, it is clear that in practice the cordet bags of the type illustrated in Figures 1 and 2 attached tend to fall into disuse.

Document WO 2006/1 10415 has proposed, in the field of the packaging of hygienic products, a bag comprising, at the mouth of the mouth, two peripheral channels in which are housed strands of a closure cord. The strands are welded to the edges of the bag, and the channels further comprise a cutout opening into the upper edge of the bag allowing a user to access the strands. By pulling the strands through the cuts, the user can then bring the edges of the bag close and thus close the mouth.

This closure system has the advantage of preventing the formation of knots at the ends of the strands, the strands being held by the edges of the bag with the aid of a weld. However, this system requires placing the channels and the cord at the free end of the mouth of the bag, and therefore can not be used for bags requiring closure at a distance from the mouth. Moreover, in use, it is difficult to close the pouch in a relatively tight manner, insofar as when pulling on the strands to close the bag, there is generally a significant hole between the sheets of the bag . This type of bag is therefore not suitable for use in other areas than sanitary products, and in particular in the field of food.

US 3,547,341 describes a bag comprising ribbons housed in an associated channel. The ribbons can be made of synthetic or natural fibers and be attached to the edges of the bag by stitching.

Documents US 3 196 757 and DE 196 35 51 describe sachets comprising ribbons housed in an associated channel, in which the ribbons do not do not protrude from said channels and can not be entered directly by a user.

US 3,010,640 discloses a sachet sachet wherein the ribbons are interconnected at their free ends.

SUMMARY OF THE INVENTION

The object of the present invention is to improve the known drawstring bags in order to facilitate their uses, in particular to facilitate the closing and opening of such bags, as well as their manufacture.

An auxiliary object of the invention is to allow to restart the development of the string bags.

The above objects are achieved according to the present invention by means of a bag having a first sheet and a second sheet together forming a first edge and a second edge of the bag, and a closure device, the closure device comprising:

a first channel and a second channel extending between the edges, the first channel and the second channel each comprising a first end and a second end, and

- A first ribbon, housed in the first channel, and a second ribbon, housed in the second channel, the first ribbon projecting from the first end of the first channel and the second ribbon projecting from the second end of the second channel.

The first ribbon is attached to the first channel and the second ribbon is attached to the second channel by welding. Furthermore, the first and second ribbon are made of a non-fuse material.

Some preferred but non-limiting characteristics of the sachet described above are the following: the first ribbon is fixed in an area adjacent to the second end of the first channel and the second ribbon is fixed in an area adjacent to the first end of the second channel.

the first ribbon is fixed to the second end of the first canal and the second ribbon is fixed to the first end of the second canal;

the first end of the first channel and the first end of the second channel are adjacent to the first edge of the bag,

the first end of the first channel and the second end of the second channel are adjacent to the first edge of the bag,

the first ribbon and the second ribbon protrude from the first channel and the second channel, respectively, at the edges of the sachet,

the first ribbon is fixed in a first zone extending at a distance from the second end of the first canal and the second ribbon is fixed in a second zone extending at a distance from the first end of the second canal, the first ribbon in addition to projecting from the second end of the first channel and the second ribbon projecting from the first end of the second channel,

the first zone extends in the central part of the first sheet and the second zone extends in the central part of the second sheet;

the second channel is closer to a mouth of the bag than the first channel, so that the first channel and the second channel are offset and do not overlap,

the non-fusible material comprises cotton or polyester,

the first and second ribbons have a contact surface respectively with the first and second channels defined so as to improve the grip of the welding of the first and second channels on the first and second ribbons respectively,

the first ribbon is also fixed to the first channel and the second ribbon is fixed to the second channel by cold mechanical assembly, the cold mechanical assembly comprises at least one staple or at least one clamp system or at least one rivet or at least one crimped nut,

the cold mechanical assembly is produced by mechanical deformation of the first sheet and the second sheet of the bag,

the first sheet and the second sheet of the bag are mechanically deformed at the level of the first channel and the second channel by stamping by means of a punch and a die

the first ribbon is also fixed to the first channel and the second ribbon is fixed to the second channel by hot or cold gluing,

the first channel and the second channel are adjacent to a mouth of the sachet, or extend at a distance of at least two centimeters, preferably at least three centimeters, from a mouth of the sachet. According to a second aspect, the invention also proposes a method of manufacturing a bag as described above, comprising the following steps:

to bring a film to a forming machine,

bringing a first and a second ribbon made of a non-fusible material to the film,

to form a first and a second channel on the film,

- Fold the film back on itself so as to form the first and second sheets of the bag,

soldering the first sheet on the second sheet, so as to form a first edge and a second edge of the bag, the first sheet and the second sheet respectively comprising the first channel and the second channel extending between the edges, the first channel; and the second channel each having a first end and a second end.

Furthermore, the first ribbon is welded at the second end of the first channel and the second ribbon is welded at the first end of the second channel using welding jaws having, in a welding face, a notch configured to come opposite the first end of the first channel and the second end of the second channel.

Some preferred but non-limiting features of the manufacturing method described above are the following:

the first channel and the second channel are positioned offset on the first sheet and the second sheet, respectively,

the method further comprises a step during which notches are formed in the film at the first end of the first channel and the second end of the second channel, so that, during the soldering step of the first sheet on the second sheet to form the first edge and the second edge of the bag, the first and second strips are not welded to the edges of the bag,

the step of welding the first and second ribbons to the first and second channels and the step of welding the first sheet to the second sheet are carried out simultaneously,

- The first channel and the second channel are formed by folding on itself a top of the leaves at the mouth or by welding a band attached to the sheets of the bag.

According to a third aspect, the invention also proposes a machine for the manufacture of a bag as described above, comprising:

a device configured to bring a film to a forming machine,

a device configured to bring a first and a second ribbon to the film,

a device configured to fold the film on itself so as to form the sheets of the bag,

solder bars (280), configured to weld the first sheet to the second sheet, so as to form a first edge and a second edge of the bag, the first sheet and the second sheet respectively comprising a first channel and a second channel extending between the first edge and the second edge, the first channel and the second channel each comprising a first end and a second end,

a mechanical assembly device configured to attach the first ribbon to the first channel and the second ribbon to the second channel by mechanical assembly and

solder jaws configured to weld the first ribbon to the first channel and the second ribbon to the second channel,

the welding jaws and / or the solder bars having, in a welding face, a notch configured to come opposite the first end of the first channel and the second end of the second channel.

Some preferred but not limiting features of the machine described above are as follows:

the mechanical assembly device comprises welding jaws,

the solder jaws are configured to simultaneously weld the first ribbon in an area adjacent to the second end of the first channel only and the second ribbon in an area adjacent to the first end of the second channel,

the machine further comprises a device configured to form notches on the film, in an area of the film intended to receive the first end of the first channel and the second end of the second channel,

- The solder jaws and / or the solder bars have, in a welding face, a notch configured to come opposite the first end of the first channel and the second end of the second channel.

BRIEF DESCRIPTION OF THE DRAWINGS Other features, objects and advantages of the present invention will appear on reading the detailed description which follows, and with reference to the accompanying drawings given by way of non-limiting examples and in which:

Figures 1 and 2 previously described are an external perspective view of a bag according to the state of the art, and a cross-sectional view of the same bag known in the state of the art;

Fig. 3 shows an outer perspective view of a pouch according to a first embodiment of the present invention;

FIG. 4 represents an external perspective view of a pouch according to a variant of the first embodiment illustrated in FIG. 3;

Figure 5 shows a cross-sectional view of the bag illustrated in Figure 4;

FIG. 6 represents a cross-sectional view of a pouch according to a variant of the embodiment illustrated in FIG. 5;

- Figure 7 shows a schematic view of the bag of Figure 3 in substantially closed position;

Figure 8 shows an outer perspective view of a pouch according to a variant of the first embodiment of the present invention;

Fig. 9 is an outer perspective view of a pouch according to a second embodiment of the present invention;

FIG. 10a is a diagrammatic detail view of the mechanical assembly of a ribbon with a bag according to a first embodiment of the invention;

FIG. 10b is a schematic detail view of an alternative embodiment of the mechanical assembly of FIG. 10a;

FIG. 11 represents a longitudinal sectional view of an embodiment of welding jaws that can be used for the manufacture of a bag according to the invention, said jaws being in position for welding the end of the channels onto the corresponding leaves; Figure 12 shows a schematic detail view of the mechanical assembly of a ribbon to a bag according to a second embodiment;

Figure 13 shows a detailed schematic view of the mechanical assembly of a tape to a bag according to a variant of the second embodiment;

FIG. 14 represents a detailed schematic view of the mechanical assembly of a ribbon with a bag according to a variant of the second embodiment;

FIG. 15 represents a detailed schematic view of the mechanical assembly of a ribbon with a bag according to a variant of the second embodiment;

FIG. 16 represents a detailed schematic view of the mechanical assembly of a ribbon with a bag according to a variant of the second embodiment;

FIG. 17 represents a detailed schematic view of the mechanical assembly of a ribbon with a bag according to a variant of the first and second embodiments;

Figure 18 is a schematic representation of an embodiment of a machine for the manufacture of a bag according to the invention; and

FIG. 19 is a flowchart representing various steps of an exemplary embodiment of the method of manufacturing a bag according to the invention.

DETAILED DESCRIPTION OF AN EMBODIMENT

The bags according to the present invention may be the subject of many variants that will not all be described in detail below.

Preferably the bag 100 comprises a first sheet 1 12 and a second sheet 1 14 parallel and adjacent at rest, interconnected on three on their sides corresponding to a bottom 1 16 and two side edges 1 17, 1 18 parallel to each other and orthogonal to the bottom 1 16.

Such a bag 100 can be made according to many methods known to those skilled in the art.

The bag 100 can be made using an element designed as a tubular extrusion or blowing so that a bag blank is in the form of a tube. This tube is closed, for example by welding, at its bottom 1 16 to close one end of the bag 100.

Such a bag 100 can also be made by folding a film on itself, for example at an edge corresponding to its bottom January 16 then ensuring the welding of the two sheets 1 12, 1 14 carried adjacent to the edges 1 17, 1 18. It is also possible to ensure the folding of the film at one of the edges 1 17, 1 18 by providing a weld at the bottom 1 16 and the complementary edge 1 18 or 1 17.

Preferably, the material constituting the film is a heat-sealable material, in particular a thermoplastic material that can be welded. The plastic material may in particular belong to the family of polyolefins and comprise at least one of the following materials: polyethylene, polypropylene, low density polyethylene, high density polyethylene, or a copolymer of these monomers.

The sheets 1 12, 1 14 may be transparent. They may, however, be provided with any appropriate printing or decoration.

Sheets January 12, January 14 may also be made of composite material, incorporating for example sheets of paper and / or metal, for example sandwich structure. In this embodiment, the film in the composite material comprises an inner face 1 13 formed in a heat-sealable material, in particular a thermoplastic material. The plastic material may in particular belong to the family of polyolefins and comprise at least one of the following materials: polyethylene, polypropylene, low density polyethylene, high density polyethylene, or a copolymer of these monomers.

The sheets 1 12, 1 14 are chosen from a material and of a thickness which makes it possible to guarantee sufficient flexibility for the bag to allow its closure by shrinking of a mouthpiece 1 19 opposite to the bottom 1 16. The sheets 1 12, 1 14 are therefore flexible.

The bag 100 further comprises a closure device 120 comprising:

a first channel 130 and a second channel 140 extending between the edges 17, 18, the first channel 130 and the second channel 140 each comprising a first end 132, 142 and a second end 134, 144, and

a first ribbon 136, housed in the first channel 130, and a second ribbon 146, housed in the second channel 140, the first ribbon 136 projecting from the first end 132 of the first channel 130 and the second ribbon 146 projecting from the second end 144 of the second channel 140.

On the other hand, the first ribbon 130 is at the first channel 130 and the second ribbon 146 is attached to the second channel 140.

It will be understood that the fixing of the ribbons 136, 146 to their respective channel 130, 140 makes it possible to block the ribbons 136, 146 in the channels 130, 140 without the need to form a knot at their free end. Moreover, the fixing of the ribbons 136, 146 to the channels 130, 140 has the advantage of avoiding running the ribbons 136, 146 along the mouth 1 19, on the two sheets 1 12, 1 14 of the bag 100. The process of manufacturing the bags 100 is thus greatly simplified, which allows to multiply by two or three their production rate.

In addition, this embodiment has the advantage of allowing the realization of the closure device 120 at the mouth 1 19 or at a distance therefrom. For example, the closure device 120 may extend in the first quarter of the bag 100, typically two, preferably three centimeter of the mouth 1 19. This provides a decorative effect when closing the bag 100 as shown in Figure 7, the mouth 1 19 taking a flared tulip shape.

Furthermore, the closure device 120 according to the invention makes it possible to simplify and improve the closure of the bag 100, in comparison with the conventional bag-and-cord bags. Indeed, the ribbons 136, 146 no longer form a loop surrounding the mouth 1 19 of the bag but simply comprise two strands which extend between the two edges 1 17, 1 18 of the bag 100: when closing the bag 100 by a user by pulling on the ribbons 136, 146, the ribbons 136, 146 are therefore no longer likely to rotate in the channels 130, 140, which tended to reduce the efficiency of the efforts of the user. Moreover, unlike the bag described in WO 2006/1 10415, the tensile stress on the ribbons 136, 146 is applied in the direction of extension of the channels 130, 140 and not perpendicular to them, which simplifies and significantly improves the approximation of the edges 1 17, 1 18 and thus the closure of the bag 100. The bag 100 is closed better, leaving only a small open passage or no passage.

The first channel 130 is preferably fixed on the first sheet 1 12 while the second channel 140 is fixed on the second sheet 1 14, to improve the closure of the bag 100.

According to a first embodiment (see FIGS. 3 to 8), the first band 130 is fixed in an area adjacent to the second end 134 of the first channel 130 and the second band 146 is fixed in an area adjacent to the first end 142 of the first channel 130. second channel 140. The ribbons 136, 146 can then be fixed either directly at the free ends 132, 144 respectively (see Figure 10a) or at a short distance from these free ends 132, 144 (see Figure 10b). According to a first variant embodiment, illustrated in FIGS. 3 and 4, the first end 132 of the first channel 130 and the first end 142 of the second channel 140 may be adjacent to the first edge 11 of the bag. Thus, in this first variant embodiment (illustrated in FIGS. 3 to 6), the first ribbon 136 and the second ribbon 146 protrude from their respective channel 130, 140 at an opposite edge 17, 18 of the bag 100. The closure of the bag 100 is therefore effected by pulling on the ribbons 136, 146 in the extension of their respective channel 130, 140, in opposite directions. Those skilled in the art will understand that, by pulling on the emergent ends of each of the ribbons 136, 146 as illustrated in FIG. 3 by the arrows referenced C and D, the closure of the mouth 1 19 is easily obtained as illustrated. in Figure 7.

To reverse the opening of a bag simply loosen the mouth 1 19 to obtain the opening of the mouth by reverse sliding ribbons 136, 146 in the channels 130, 140.

In a second variant embodiment illustrated in FIG. 8, the first end 132 of the first channel 130 and the second end 144 of the second channel 140 are adjacent to the first edge 17 of the bag 100. Thus, the first band 136 and the second band 146 project from their respective channel 130, 140 at the same edge 1 17 of the bag 100. The closure of the bag 100 is therefore done by pulling on the ribbons 136, 146 in the extension of their respective channel 130, 140, in the same direction, by grasping the first edge 1 17 of the bag at which the ribbons 136, 146. project. In a second embodiment, illustrated in Figure 9, the first ribbon 136 is fixed to the channel 130 in a first zone 170 extending away from the second end 134 of the first channel 130 and the second band 146 is attached to the channel 140 in a second area 171 extending away from the first end 142 of the second channel 140. for example, the first zone 170 and the second zone 171 may extend in a central portion of the first sheet 1 12 and the second sheet 1 14, respectively. On the other hand, the first zone 170 and the second zone 171 may be superimposed or offset relative to one another along the channels 130, 140.

In this embodiment, the first band 136 also projects from the second end 134 of the first channel 103 while the second band 146 also projects from the first end 142 of the second channel 140.

The closure of a bag 100 according to the second embodiment is thus seizing the bag 100 in the first and the second area, at the level of the fixing of the ribbons 136, 146, and to pull on the free ends of the ribbons 136, 146 (or simultaneously, at a first edge 1 17 of the bag 100 and then at the second edge 1 18 of the bag 100). This closure is particularly easy insofar as the distance to be traveled by the edges 17, 18 to reach the closed configuration of the bag 100 is reduced (by half when the zones 170 and 171 are in the middle of the channels 130, 140), which reduces both the time required to close the bag 100 and friction related to the pleating of the sheets 1 12, 1 14. The opening can also be done by pulling on the edges 1 17, 1 18 of the bag 100 either holding the first 170 and the second 171 zone in hands and pulling on the first 17 and the second edge 18 of the bag 100. Here again, the opening is simplified by the separation of the channels 130, 140 in two parts by welding in the first 170 and the second zone 171.

Whatever the embodiment, the first channel 130 and the second channel 140 may be offset relative to one another according to the height of the bag 100 (see FIG. 3), that is to say that the second channel 140 may be closer to the mouth 1 19 of the bag 100 than the first channel 130. Because of this offset, the first channel 130 and the second channel 140 are not superimposed when the bag 100 is laid flat. This offset of the first and second channels 130, 140 makes it possible, when closing the bag 100 by pulling on the ribbons 136, 146 in opposite directions, to deform the channels 130, 140 and therefore the mouth 1 19 by bringing the first channel 130 and the second channel 140. This deformation has the effect of accentuating the folding sheets 1 12, 1 14 and thus improve the sealing of the bag 100.

Alternatively, the first channel 130 and the second channel 140 may on the contrary be superimposed and not be offset relative to each other according to the height of the bag 100.

As indicated above, the first ribbon 136 is attached to the first channel 130 and the second ribbon 146 is attached to the second channel 140 by mechanical assembly. According to a first embodiment, the mechanical assembly is realized

"Hot", that is to say with a contribution of heat.

In the example illustrated in FIGS. 10a and 10b, the ribbons 136, 146 are formed of a non-fuse material (such as cotton or polyester, for example), and are welded to the first channel 130 and the second channel 140 so as to mechanically trapping the first and second ribbon 136, 146, respectively. The welding of the first and the second channel 130, 140 of an example of bag 100 according to the first embodiment achieving the mechanical imprisonment of the ribbons 136, 146 is referenced 150 in Figure 10a.

The solder 150 of the first channel 130 and the second channel 140 produces a shearing effect of the ribbons 136, 146, thus making it possible to form connection points between the bag 100 and the ribbons 136, 146.

The weld 150 may be wide (depending on the height of the bag) to ensure proper attachment of the ribbon 136, 146 to the channels 130, 140 of the bag 100. In particular, the weld 150 preferably covers the entire width of the ribbon 136, 146 and extends wholly or partly on the channels 130, 140 around the ribbons 136, 146, so as to ensure an optimum shearing effect.

The mechanical assembly can be performed using welding jaws 260 configured to weld the first channel 130 and the second channel 140, so as to mechanically trap the first and the second ribbon 136, 146 in the corresponding channels 130, 140 .

The welding of the ribbons 136, 146 can be performed simultaneously. For this, and especially in the case of the production of a bag 100 according to the first embodiment, the welding jaws 260 may have, in a welding face 262, a notch 264 configured to come opposite the first end 132 of the first channel 130 and the second end 144 of the second channel 140, in order to weld only the second end 134 of the first channel 130 and the first end 142 of the second channel 140 (see for example the solder jaws 260 illustrated in FIG. Figure 1 1). It will be understood that it is preferable to avoid that the portions of the strips 136, 146 projecting from the channels 130, 140 are mechanically trapped by the edges 17, 18 of the bag 100.

These welding jaws 260 are particularly suitable when the first and second channels 130, 140 are offset. A single welding step is then necessary to fix the ribbons 136, 146 in the channels 130, 140. This gives a bag 100 whose channels 130, 140 are offset. This variant embodiment is particularly advantageous insofar as it makes it possible to weld the channels 130, 140 of the bag 100 in a reliable and fast manner so as to mechanically trap the ribbons 136, 146 on the bag 100.

Alternatively, the welding jaws 260 may be conventional. They then further comprise a counter-element configured to be placed between the sheets 1 12, 1 14 during the welding of the ribbons 136, 146 in their respective channel 130, 140, in order to prevent welding of the ribbons 136, 146 to first channel 130 and the second channel 140 entails the welding of the part facing the second channel 140 or the first channel 130, respectively. In this case, the channels 130, 140 may be shifted as well as aligned (that is to say superimposed).

Optionally, and in particular in the case of the production of a bag 100 according to the first embodiment, the bag 100 may further comprise notches 137, 147 (or clearances) formed at the ends to remain free of the Thus, when welding the edges 17, 18 of the bag 100 by solder bars 280, the heat applied by the bars 280 does not have the effect of melting the film locally and imprisoning the film. mechanically the ends to remain free of the ribbons 136, 146.

Where appropriate, the notches 137, 147 also make it possible to use ribbons 136, 146 having a length equal to the width (edge 1 17 to edge 1 18) of the bag 100, while ensuring good handling of said ribbons 136, 146 to close the bag 100.

The mechanical imprisonment of the ribbons 136, 146 is particularly effective when ultrasonic welding jaws, in particular by points, are used. Such solder jaws effectively make it possible to ensure an optimum shearing effect of the ribbons 136, 146. Alternatively, the weld can also be obtained by multiple welding or wire. According to yet another variant, the ultrasonic weld can be supplemented by a thermal weld, in order to reinforce the mechanical imprisonment and to avoid any risk of delamination.

The ribbons 136, 146 may further have a contact surface with their respective channel 130, 140 defined to improve the grip of the weld 138, 148 of the channel 130, 140 on the ribbon 136, 146. For this, it is for example it is possible to increase the roughness of the ribbon 136, 146 or to define a shape of the ribbon 136, 146 making it possible to improve the grip of the solder 150 on the ribbon 136, 146. In particular, a ribbon 136, 146 of the ribbon The shape of a strip will have a greater contact area than a strip 136, 146 generally cylindrical, and thus the setting of the weld 138, 148 on the ribbon 136, 146 will be improved.

According to a second embodiment, the mechanical assembly can also be made "cold", that is to say without specific heat input. In this second embodiment, the mechanical assembly is thus carried out at ambient temperature, or at least at a temperature below the melting point of the materials constituting the sheets 1 12, 1 14 and, where appropriate, the ribbons 136, 146.

Furthermore, in this second embodiment, the ribbons 136, 146 may be made in any type of material, whether it is a heat-sealable material, cotton or polyester.

In the case of a weldable material, the ribbons may in particular be made of a thermoplastic material of the family of polyolefins and comprise at least one of the following materials: polyethylene, polypropylene, low density polyethylene, polyethylene high density, or a copolymer of these monomers. Advantageously, the use of polyolefin tapes 136, 146, and in particular comprising a polymer or a copolymer of polyethylene, polypropylene, low density polyethylene, and / or high density polyethylene, enables the bag to be recycled.

It will of course be understood that the first embodiment and the second embodiment can be combined, that is to say that the mechanical assembly can be carried out hot, by welding, then cold, in order to reinforce the fixation. by welding, or vice versa.

The cold mechanical assembly can be performed using one or more attachment systems 151 -156 reported on the sheets 1 12, 1 14 of the bag 100 so as to block the ribbons 136, 146 in the corresponding channels 130, 140. Thus, in the example illustrated in FIG. 12, the mechanical assembly is carried out by means of one or more staples 151.

In the example illustrated in FIG. 13, the mechanical assembly is carried out using a gripper system 152.

In the example illustrated in FIG. 14, the mechanical assembly is performed by means of one or more rivets 153. The rivets 153 are, for example, inserted into corresponding openings, made by drilling the first channel 130 and the first one. ribbon 136 on the one hand, and second channel 140 and second ribbon 146 on the other hand. This variant embodiment is particularly suitable when the strip 136, 146 is in the form of a strip.

In the example illustrated in FIG. 15, the mechanical assembly is carried out by means of one or more crimped nuts 156. Before crimping, the nuts 156 are for example inserted into corresponding openings, made by drilling the first channel. 130 and the first ribbon 136 on the one hand, and the second channel 140 and the second ribbon 146 on the other hand. This variant embodiment is particularly suitable when the strip 136, 146 is in the form of a strip.

When the first ribbon 136 and the second ribbon 146 are fixed in zones facing the channels 130, 140 - especially when the second end 134 of the first channel 130 and the first end 142 of the second channel 140 are adjacent to the second edge 1 18 of the 100, as illustrated in Figure 8, or that the ribbons 136, 146 are fixed in areas 170 and 171 opposite, as shown in Figure 9- a same fastening system (clip 151, clamps 152, rivets 153, crimped nuts 156, etc.) can advantageously perform the mechanical assembly of the two ribbons 136, 146 in their respective channel 130, 140.

In the example illustrated in FIG. 16, the mechanical assembly is effected by mechanical deformation 157 of the sheets 1 12, 1 14 of the bag 100 at the level of the first channel 130 and the second channel 140. The sheets 1 12, 1 14 of the 100 sachet are for example mechanically deformed by stamping by means of a punch 160 and a die 161.

According to a third embodiment of the invention illustrated in FIG. 17, the mechanical assembly can be made by adhesion 158. The adhesion can be "hot", that is to say with a heat input, or "cold", that is to say without specific heat input. Here again, the first embodiment and the third embodiment can be cumulated, that is to say that the mechanical assembly can be carried out hot, by welding, then by adhesion, in order to reinforce the fixing by welding , Or vice versa.

In the case of a hot adhesion, the tape 136, 146 may be coated with an adhesive material which melts when applying the solder bars 280 to form the edges 1 17, 1 18 of the bag 100 or by dedicated solder jaws (especially when the strips 136, 146 are fixed in zones 170 and 171 of the channels 130, 140).

Alternatively, in the case of cold adhesion, a pressure-sensitive adhesive material may be applied to the tape 136, 146 or channels 130, 140.

According to yet another alternative, the inner layer of the sheets 1 12, 1 14 of the bag 100 may comprise an adhesive material.

The channels 130, 140 may be made, as illustrated in Figure 4, by folding on itself the top of each of sheets 1 12, 1 14 and ensuring two weld lines 131, 133; 141, 143 of the fold thus formed on the sheets 1 12, 1 14 to define between the weld lines 131, 133 and 141, 143 the channels 130, 140.

It is also possible, as illustrated in FIG. 5, to add strips 139, 149 on the inside or on the outside of the sheets 1 12, 1 14 welded respectively at two parallel lines 131, 133; 141, 143 to define the channels 130, 140 above. Obviously to allow emergence of ribbons 136, 146, the end of the channels 130, 140 opposite the connection points must be open.

Those skilled in the art will understand that by pulling on the emergent ends of each of the ribbons 136, 146 as illustrated in FIG. 3 by the arrows referenced C and D, the closure of the mouthpiece 1 19 is easily obtained as illustrated in FIG. Figure 7.

Machine 200 for making sachets 100

The bags 100 can then be obtained using a machine 200 comprising:

a device 210 configured to feed a film 1 onto a forming machine,

a device 220 configured to cut the film,

a device 230 configured to bring a first and a second ribbon 136, 146 onto the film 1,

optionally, a device 240 for forming the first channel 130 and the second channel 140 on the film 1 (or alternatively for bringing the first channel 130 and the second channel 140 onto the film 1),

first solder bars 250, configured to weld the first channel 130 and the second channel 140 on the film 1,

a mechanical assembly device 260 configured to attach the first ribbon 136 to the first channel 130 and the second ribbon 146 to the second channel 140.

In the case of fastening by mechanical hot joining, the fastening device 260 may comprise welding jaws. This exemplary embodiment has been illustrated in FIG. 18. The welding jaws 260 may then be conventional and comprise a counter-element, or specific and comprise a welded surface 262 with notching 264 (FIG. 11).

The machine 200 may further comprise a device 270 for folding the film 1 to form the first 1 12 and the second 1 14 sheet, as well as conventional solder bars 280 for welding the first sheet 1 12 to the second sheet 1 14, so as to form the first edge 1 17 and the second edge 1 18 of the bag 100.

The solder bars 280 may in particular comprise ultrasonic electrodes.

The machine 200 may further comprise a device 215 configured to form notches 137, 147 on the film 1, in the region of the film 1 for receiving the first end 132 of the first channel 130 and the second end 144 of the second channel 140. These notches 137, 147 are intended to avoid the welding of the ribbons 136, 146 on the film 1 during the step S7 of welding the edges 1 17, 1 18 of the bag 100. The realization of the notches 137, 147 in the film 1 makes it possible to remove material at the ends 132, 144 to remain free of the channels 130, 140, so that when welding the edges 1 17, 1 18 of the bag 100 by the welding bars 280 , the heat applied by the bars 280 does not have the effect of locally melting the film 1 and welding these ends 132, 144, thus ensuring that the ribbons 136, 146 remain free of movement at these ends 132, 144 .

In particular, in the case of producing a bag 100 according to the second embodiment, the device 215 may be configured to form notches 137, 147 on the film 1, in the region of the film 1 intended to receive the ends 132, 134, 142, 144 of the channels 130, 140. Thus, when welding the edges 1 17, 1 18 of the bag 100 by the sealing bars 280, the ribbons 136, 146 are assured to remain free of movement at the each of the ends 132, 134, 142, 144 of the channels 130, 140. When the machine 200 comprises a device 215 configured to form notches 137, 147 on the film 1, the solder bars 280 may further have, in a solder face, a notch configured to come opposite the notches 137, 147. It will be understood that, since the ribbons 136, 146 are formed of a heat-sealable material, it is preferable to prevent their parts protruding from the channels 130, 140 at the notches 137, 147 from being cut by the sealing bars. 280, when they weld the first sheet 1 12 on the second sheet 1 14, so as to form the first edge 1 17 and the second edge 1 18 of the bag 100.

S process for manufacturing sachets 100

The bag 100 may be obtained according to a manufacturing method S comprising the following steps.

During a first step S1, a film 1 for forming the sheets 1 12, 1 14 of the bag 100 is fed to a forming machine 200.

During a second step S2, the ribbons 136, 146 are fed onto the film 1, for example longitudinally with respect to a running direction of the film 1.

During a third step S3, optional, notches 137, 147 may be formed on the film 1, in the region of the film 1 for receiving the ends 132, 134, 142, 144 of the channels 130, 140.

During a fourth step S4, the film 1 is cut, if necessary at the notches 137, 147. This cut has the effect of separating the portion of the film 1 for forming the bag of the rest of the film 1. At this stage of the process S, a film 1 is obtained whose length is substantially equal to the final distance between the edges 17, 18 of the bag 100, the film being provided with notches 137, 147 at both ends. free ribbons 136, 146.

During a fifth step S5, the sides of the film 1 are folded back on themselves so as to form the first 130 and second 140 channels, so that the channels 130, 140 extend parallel to the direction of scrolling the film 1. The sides of the film 1 are then welded to the film 1 by providing one or two weld lines 131, 133; 141, 143 of the fold thus formed on the sheets 1 12, 1 14 to define between the weld lines 131, 133 and 141, 143 the channels 130, 140 (see Figure 5).

Alternatively, strips 139, 149 for forming the channels 130, 140 may be attached and welded to the inside or outside of the film 1, over the ribbons 136, 146 (see Figure 6).

Of course, at this step S5 of method S, the channels are open 130, 140 at their ends 132, 134, 142, 144 to allow the emergence of ribbons 136, 146.

During a sixth step S6, the first ribbon 136 is fixed to the first channel 130 and the second ribbon 146 is fixed to the second channel 140 by means of the mechanical assembly device 260, for example welding jaws in the case of fixing by mechanical assembly when hot.

During a seventh step S7, the film 1 provided with ribbons 136, 146 and fixed to their respective channel 130, 140 is folded back on itself so as to form the first 1 12 and the second 1 14 sheet. The first 1 17 and second 1 18 edges of the sheets 1 12, 1 14 are then welded together by the solder bars 280.

When notches 137, 147 have been formed in step S4 on the film 1, the application of the solder bars 280 on the edges 1 17, 1 18 of the sheets 1 12, 1 14 has the effect of not soldering the ends 132, 134, 142, 144 of the channels 130, 140 to the edges 1 17, 1 18 respectively, leaving the strips 136, 146 free to move through these ends 132, 134, 142, 144.

In an alternative embodiment, when the first ribbon 130 is welded in an area adjacent to the second end 134 of the first channel 130 and the second ribbon 146 is welded in an area adjacent to the first end 142 of the second channel 140, the steps S6 and S7 can be performed simultaneously. For this purpose, the ribbons 136, 146 are welded to the channels 130, 140 at the same time as the sheets 1 12, 1 14 are welded together to form the edges 1 17, 1 18 of the bag 100. A single welding device 260 or 280 is then necessary to perform these two steps S6, S7.

Naturally, the present invention is not limited to the embodiments that have just been described but extends to any variant within its spirit.

In particular the configuration of the bags 100 may be subject to many variants known to those skilled in the art. It is thus possible to provide expansion bellows at the bottom 1 16 and / or the side edges 1 17, 1 18. These arrangements are known to those skilled in the art and will not be described in more detail later .

Furthermore the sheets 1 12, 1 14 shown in the accompanying figures have a rectangular contour. Of course, the invention is not limited to this particular geometry.

The welds made on the bags to delimit the channels 130, 140 may be continuous or discontinuous.

It can be provided that the strips 136, 146 are engaged inside the channels 130, 140 along their whole length or that they emerge punctually from the channels thanks to discontinuities or windows formed locally in the sheet 1 12, 1 14 component the channels 130, 140.

The ribbons 136, 146 may be single-material or multi-material, for example bimaterial.

According to another variant embodiment, a sliding agent can be provided on the ribbons 136, 146 and / or inside the channels 130, 140 in order to facilitate the sliding of the ribbons 136, 146 in the channels 130, 140.

The present invention applies to many types of market, such as for example the field of hygiene and the food industry, without being limiting.

Claims

1. Bag (100) having a first sheet (1 12) and a second sheet (1 14) together forming a first edge (1 17) and a second edge (1 18) of the bag (100), and a closure device (120) ), the closure device comprising:

a first channel (130) and a second channel (140) extending between the edges (1 17, 1 18), the first channel (130) and the second channel (140) each including a first end (132, 142); ) and a second end (134, 144), and

a first ribbon (136), housed in the first channel (130), and a second ribbon (146), housed in the second channel (140), the first ribbon (136) projecting from the first end (132) of the first channel (130) and the second ribbon (146) projecting from the second end (144) of the second channel (140),

the bag (100) being characterized in that:

the first ribbon (136) is fixed to the first channel (130) and the second ribbon (146) is attached to the second channel (140) by welding (150, 151, 152, 153, 156, 157, 158), and

- The first and second ribbon (136, 146) are made of a non-fuse material.

The bag (100) according to claim 1, wherein the first ribbon (136) is secured in an area adjacent to the second end (134) of the first channel (130) and the second ribbon (146) is secured in an area. adjacent the first end (142) of the second channel (140).

The pouch (100) of claim 2, wherein the first ribbon (136) is attached to the second end (134) of the first channel (130) and the second ribbon (146) is attached to the first end (142). the second channel (140).

4. Bag (100) according to one of claims 2 or 3, wherein the first end (132) of the first channel (130) and the first end (142) of the second channel (140) are adjacent to the first edge (1). 17) of the bag (100).

Bag (100) according to one of claims 2 or 3, wherein the first end (132) of the first channel (130) and the second end (144) of the second channel (140) are adjacent to the first edge (1). 17) of the bag (100).

Bag (100) according to one of claims 2 to 5, wherein the first ribbon (136) and the second ribbon (146) protrude from the first channel (130) and the second channel (140), respectively, to the level of the edges (1 17, 1 18) of the bag (100).

The bag (100) of claim 1, wherein the first ribbon (136) is secured in a first zone (170) extending away from the second end (134) of the first channel (130) and the second ribbon (146) is secured in a second region (171) extending away from the first end (142) of the second channel (140), the first ribbon (136) further projecting from the second end (134) of the first channel (130) and the second ribbon (146) further projecting from the first end (142) of the second channel (140).

Bag (100) according to claim 7, wherein the first zone

(170) extends in the central portion of the first sheet (1 12) and the second area

(171) extends in the central portion of the second sheet (1 14).

9. Bag (100) according to one of claims 1 to 8, wherein the second channel (140) is closer to a mouth (1 19) of the bag (100) than the first channel (130), so that the first channel (130) and the second channel (130) are offset and do not overlap.

The bag (100) according to one of claims 1 to 9, wherein the non-fusible material comprises cotton or polyester.

1 1. Bag (100) according to one of claims 1 to 10, wherein the first and second ribbons (136, 146) have a contact surface respectively with the first and second channels (130, 140) defined to improve grip. welding (138, 148) of the first and second channels (130, 140) on the first and second ribbons (136, 146) respectively.

Bag (100) according to one of claims 1 to 11, wherein the first ribbon (136) is further secured to the first channel (130) and the second ribbon (146) is attached to the second channel (140). by cold mechanical assembly (151, 152, 153, 156, 157).

13. Bag (100) according to claim 12, wherein the cold mechanical assembly comprises at least one staple (151) or at least one clamp system (152) or at least one rivet (153) or at least one nut crimped (156).

14. Bag (100) according to claim 12, wherein the cold mechanical assembly is made by mechanical deformation (157) of the first sheet (1 12) and the second sheet (1 14) of the bag (100).

The bag (100) according to claim 14, wherein the first sheet (1 12) and the second sheet (1 14) of the bag (100) are deformed. mechanically (157) at the first channel (130) and the second channel (140) by stamping by means of a punch (160) and a die (161).

The bag (100) according to one of claims 1 to 15, wherein the first ribbon (136) is further attached to the first channel (130) and the second ribbon

(146) is attached to the second channel (140) by gluing (158) hot or cold.

17. Bag (100) according to one of claims 1 to 16, wherein the first channel (130) and the second channel (140) are adjacent to a mouth (1 19) of the bag (100), or extend at a distance at least equal to two centimeters, preferably at least three centimeters, of a mouth (1 19) of the bag (100).

18. A method of manufacturing (S) a bag (100) according to one of claims 1 to 17, comprising the following steps:

bringing (S1) a film (1) to a forming machine,

bringing (S2) a first (136) and a second (146) ribbon onto the film (1),

forming (S5) a first (130) and a second (140) channel on the film (1)

- folding (S7) the film (1) on itself so as to form the first (1 12) and second (1 14) sheet of the bag (100),

- welding (S7) the first sheet (1 12) on the second sheet (1 14), so as to form a first edge (1 17) and a second edge (1 18) of the bag (100), the first sheet ( 1 12) and the second sheet (1 14) respectively comprising the first channel (130) and the second channel (140) extending between the edges (1 17, 1 18), the first channel (130) and the second channel (140) each having a first end (132, 142) and a second end (134, 144),

the method (S) being characterized in that:

the first strip (136) is welded at the second end (134) of the first channel (130) and the second strip (146) is welded at the level of the first end (142) of the second channel (140) (S6) using solder jaws (260) having, in a solder face (262), a notch (264) configured to face the first end (132) of the first channel (130) and the second end (144) of the second channel (140), and

- The first and second ribbon (136, 146) are made of a non-fuse material.

The manufacturing method (S) according to claim 18, wherein the first channel (130) and the second channel (140) are positioned offset on the first sheet (1 12) and the second sheet (1 14), respectively.

20. Manufacturing method (S) according to one of claims 18 or 19, further comprising a step (S3) during which notches (137, 147) are formed in the film (1) at the level of the first end (132) of the first channel (130) and the second end (144) of the second channel (140), so that in step (S7) of welding the first sheet (1 12) on the second sheet (1 14) to form the first edge (1 17) and the second edge (1 18) of the bag (100), the first (136) and second (146) ribbons are not welded to the edges (1 17, 1 18) of the bag (100).

21. Manufacturing method (S) according to one of claims 18 to 20, wherein the step (S6) of welding the first and second ribbons (136, 146) to the first and second channels (130, 140) and the step (S7) welding of the first sheet (1 12) on the second sheet (1 14) are performed simultaneously.

22. Manufacturing method (S) according to one of claims 18 to 21, wherein the first channel (130) and the second channel (140) are formed by folding on itself a top of the sheets (1 12 , 1 14) at the mouth (1 19) or by welding (150) a band (139, 149) reported on the sheets (1 12, 1 14) of the bag (100).

23. Machine (200) for the manufacture of a bag (100) according to one of claims 1 to 17, comprising:

a device (210) configured to feed a film (1) onto a forming machine,

a device (230) configured to bring a first (136) and a second (146) ribbon (146) onto the film (1),

a device (270) configured to fold the film (1) on itself so as to form the sheets of the bag (100),

welding bars (280), configured to weld the first sheet

(1 12) on the second sheet (1 14), so as to form a first edge (1 17) and a second edge (1 18) of the bag (100), the first sheet (1 12) and the second sheet ( 1 14) respectively comprising a first channel (130) and a second channel (140) extending between the first edge (1 17) and the second edge (1 18), the first channel (130) and the second channel (140). ) each having a first end (132, 142) and a second end (134, 144), and

solder jaws (260) configured to weld the first ribbon (136) to the first channel (130) and the second ribbon (146) to the second channel (140),

the machine (200) being characterized in that the welding jaws (260) and / or the solder bars (280) have, in a welding face (262), a notch (264) configured to face the first end (132) of the first channel (130) and the second end (144) of the second channel (140). .

The machine (200) of claim 23, wherein the solder jaws (260) are configured to simultaneously weld the first band (136) in an area adjacent to the second end (134) of the first channel (130) only and the second ribbon (146) in an area adjacent the first end (142) of the second channel (140).

The machine (200) of claim 24 further comprising a device (215) configured to form notches (137, 147) on the film (1) in a region of the film (1) for receiving the first end ( 132) of the first channel (130) and the second end (144) of the second channel (140).