EP1003395B1 - Bag comprising matching closing sections actuated by a slider - Google Patents

Abstract

A bag including two generally parallel sheets forming the main walls of the bag, complementary closure strips fixed to respective ones of the sheets, and a cursor for actuating the strips for closing and opening purposes. The bag further includes, parallel to the closure strips, between the sheets, and level with the mouth of the bag, additional structure in relief disposed on the insides of the closure strips, designed to provide sealing by forming a barrier between the sheets in the closed position of the bag, the additional structure in relief being placed facing the flanks of the cursor to be urged towards their sealing position by the cursor when the cursor is moved towards the sealing position.

Description

The present invention relates to the field of sachets comprising complementary closure profiles actuated respectively at opening and closing with a cursor.

Such sachets are described, for example, in documents EP-A-0051010, EP-A-0102301 and EP-A-0479661.

These sachets activated at opening and closing by a slider have already done great service.

The sliders make it easier to open and close the bags. The presence of a cursor is particularly appreciated by elderly or visually impaired people.

However, the majority of known slider bags do not give totally satisfied. In particular, most of these sachets do not do not have a complete seal in the closed position of the profiles. This leak is due to the fact that the profiles remain separate, in before the cursor.

Sealing is however demanded in many applications, in particular but not limited to the sachets used for freezing food products.

We tried to remedy this drawback by proposing profiles closure with local discontinuity near the end receiving the cursor in the closed position of the bag, so that the cursor enters this discontinuity and allows perfect engagement of profiles over their entire length, in the closed position.

Nevertheless the means proposed in this context prove to be strong complex. They do not always allow a perfect seal sachets. In addition, they have the major drawback of not retaining the cursor perfectly and therefore to cause for example a risk of the cursor being ingested by young children.

The present invention now aims to improve the performance of known slider bags.

The main purpose of the present invention is to provide sachets having a greater seal than that of the earlier sachets known.

Another object of the present invention is to propose means limiting the risk of inadvertent removal of the cursor, in particular in order to limit the risk of ingestion by young children.

Another object of the present invention is to propose means allowing a high productivity rate in automatic.

These aims are achieved in the context of the present invention thanks to a sachet of the type defined in claim 1 attached.

According to certain embodiments, said additional means in relief are placed next to the sides of the cursor.

As will be explained below, such additional means in relief can be formed for example of at least one bead integral with the internal surface of a sheet of the sachet, or even of two beads symmetrical integral respectively with the internal surface of the two leaves of the sachet, or of complementary male / female elements secured respectively to the internal surface of the two sheets of the sachet.

According to another advantageous characteristic of the present invention, the bag has on its mouth, means located at the opposite of said additional sealing means, with respect to the profiles closing, and adapted to define a support between the internal faces opposite patois of the sachet and there is provided on the cursor means able to stress the walls of the sachet, inwards, in an area of these walls between the additional sealing means and the means support. Thus it is guaranteed that said additional means are requested in a sealing position, by the slider. Preferably this solicitation is made to the right of the closure profiles.

The present invention also relates to films equipped with such sealing means and such closure profiles, as well as strips extruded carrying these means.

According to another advantageous characteristic of the present invention, the bag has two generally parallel sheets forming the main walls of the bag, additional closure profiles fixed respectively on these sheets at the mouth of the bag and a cursor comprising two lateral wings connected to each other at the level a base, placed on the outside of the sheets at the mouth of the bag and which define with a central sole elongated, two converging passage lanes for the profiles of additional closure and the bag is characterized in that the sole is interrupted back from the longitudinal end of the slider, at minus on the widest side of the cursor corresponding to the divergent side passage corridors, and that the lateral wings are provided in the vicinity of their free edge opposite the base, of means for biasing the laminations of the sachet in reconciliation, covering the entire longitudinal extent of the sole and extending longitudinally beyond on either side thereof, to seal the bag in its closed position.

• la figure 1 représente une vue schématique en coupe d'un sachet conforme à un premier mode de réalisation de la présente invention,
• les figures 2 à 11 illustrent selon des vues en coupe similaires, une première série de variantes de réalisation conformes à la présente invention,
• les figures 12 à 29 illustrent une seconde série de variantes de réalisation conformes à la présente invention,
• les figures 30 à 39 illustrent une troisième série de variantes de réalisation conformes à la présente invention,
• les figures 40 à 42 représentent trois vues schématiques en coupe transversale d'un sachet équipé d'un curseur, selon des vues référencées respectivement I-I, II-II et III-III sur la figure 43,
• la figure 43 représente une vue en coupe longitudinale médiane d'un curseur conforme à la présente invention, selon le plan de coupe référencé IV-IV sur les figures 40 à 42, et
• la figure 44 représente une autre vue en coupe longitudinale du cufseur selon le plan de coupe référencé V-V sur la figure 43.

Other characteristics, aims and advantages of the present invention will appear on reading the detailed description which follows and with reference to the appended drawings, given by way of nonlimiting examples and in which:

• FIG. 1 represents a schematic sectional view of a sachet in accordance with a first embodiment of the present invention,
• FIGS. 2 to 11 illustrate, according to similar section views, a first series of variant embodiments in accordance with the present invention,
• FIGS. 12 to 29 illustrate a second series of variant embodiments in accordance with the present invention,
• FIGS. 30 to 39 illustrate a third series of variant embodiments in accordance with the present invention,
• FIGS. 40 to 42 represent three schematic views in cross section of a bag equipped with a cursor, according to views referenced respectively II, II-II and III-III in FIG. 43,
• FIG. 43 represents a view in median longitudinal section of a cursor according to the present invention, according to the section plane referenced IV-IV in FIGS. 40 to 42, and
• FIG. 44 represents another view in longitudinal section of the feeder along the cutting plane referenced VV in FIG. 43.

There is shown schematically in Figure 1 a bag 10 whose mouth is referenced 12 and the bottom 14.

The bag 10 is composed of two main sheets 16, 18. These are interconnected at the bottom 14 (by folding, the two sheets 16, 18 being integral with origin as illustrated in FIGS. 1 to 3, or by welding or gluing, the two sheets 16, 18 being initially separated and superimposed during manufacture as illustrated in FIGS. 4 to 9, or by welding or gluing the edges of a single folded sheet on itself at the mouth, as illustrated for example on Figures 10 and 11), as well as at the two lateral edges perpendicular to the bottom 14 and the mouth 12 (the connection at the side edges is preferably provided by welding or gluing).

At the level of the mouth 12, the two sheets 16, 18 are provided of complementary closure profiles 20, 22.

These complementary closure profiles 20, 22 can make the object of many embodiments. The invention is not limited to specific embodiments illustrated in the accompanying figures. We will note moreover that two variants of production of such closure profiles 20, 22, respectively on the Figures 1 to 3 and 12 et seq on the one hand and in Figures 4 to 11 on the other go.

In particular, the invention applies to closure profiles 20, 22 respectively of male and female type as is well known from those skilled in the art and as shown schematically in Figures 1 to 3 and 12 and following. However, the invention is not limited to this particular provision and can also extend for example to closure profiles 20, 22 of the hook type as illustrated in figures 4 to 11.

As illustrated in Figures 1, 3 to 7 and 10 in particular the profiles additional closure 20, 22 may have come from extrusion on the sheets 16, 18 making up the sachet (more precisely on the inner surface of these sheets 16, 18 according to the embodiments of Figures 1 and 3 to 7 and on the external surface of these sheets according to the embodiment of the Figure 10 when the sheets 16, 18 form, at the mouth of the bag, a bellows folded towards the inside of the bag to form a control veil opening).

However, according to an alternative embodiment, the profiles of closure 20, 22 can be formed initially on support webs respective 21, 23 reported on sheets 16, 18, at the level of the mouth 12 of the bag, as illustrated in FIGS. 2, 8, 9 and 11. Here again, it will be noted that according to FIGS. 2, 8 and 9 the support webs 21, 23 are fixed on the internal surface of the sheets 16, 18. On the other hand according to the Figure 11, the sheets 16, 18 forming, at the mouth of the bag, a bellows folded towards the inside of the bag to form an opening veil, the support webs 21, 23 are fixed on the external surface of the sheets 16, 18.

The connection between the webs 21, 23 and the films 16, 18 can be produced by any suitable conventional means, for example by welding hot or sticking.

The use of closure profiles not from extrusion on films 16, 18, but reported by welding or gluing is not illustrated on the accompanying drawings only in Figures 2, 8, 9 and 11. However, the use such closure profiles 20, 22 attached to the films 16, 18 may apply to all of the variant embodiments in accordance with the invention.

As previously indicated in the context of this invention, the bag further comprises on the one hand a slider 50 suitable for actuate the profiles 20, 22 on closing and opening, and on the other hand, parallel to the closure sections 20, 22, between said sheets 16, 18 and at the mouth 12 of the bag, additional means relief 100 designed to ensure sealing by forming a barrier between the sheets 16, 18, in the closed position of the bag, said means additional reliefs 100 being placed opposite the flanks 52, 54 of the cursor 50 to be pressed towards their sealing position by the cursor 50 when the latter is moved to the sealing position.

The cursor 50 can be the subject of numerous embodiments classics. The cursor 50 may in particular comply with the provisions described in document EP-A-0479661.

For this reason, the cursor 50 will not be described in detail by the following.

Note, however, that preferably the cursor 50, produced in plastic material, has two lateral wings 52, 54 (or "sides") interconnected at a base 56 and which define with a elongated central sole (not shown in the figures appended to level of the location of the section plane illustrated) two passage lanes converging for complementary nestable closing profiles 20, 22. Thus, when the relative direction of movement of the cursor 50 by relative to the closure profiles 20, 22 tends to move the cursor 50 in forcing the closing profiles 20, 22 in engagement, the bag is closed. When the cursor 50 is moved in the opposite direction, the bag is open.

Films 16, 18, closure profiles 20, 22 and the means additional sealing 100 can be made of any material suitable plastic known to those skilled in the art. Preferably, it is polyolefin, very advantageously of low or high density polyethylene, even polypropylene.

Preferably in the context of the present invention, the means 100 are arranged on the inside of the closure profiles 20, 22 (this is say towards the inside of the bags with respect to these closure profiles 20, 22) and extend over the entire length of the sachets (i.e. have the same length as the closure profiles 20, 22).

According to the first embodiment illustrated in Figure 1, said additional sealing means 100 are formed by a bead 102 parallel to the profile 20 and integral with one of the sheets 16. According to FIG. 1 this bead 102 came from extrusion on the film 16. As a variant, however as mentioned above, the bead 102 could have come of extrusion on a support veil attached to this film 16.

Such a bead 102 is placed opposite the flanks 52, 54 of the cursor 50 and on the inside of these. Thus the bead 102 is stressed in press against the opposite film 18 when the cursor 50 is moved to position closing.

Preferably the geometry of the sections 20, 22, of the means 100 and of the cursor 50 is such that the sides 52, 54 of the cursor 50 impose on the means 100, transverse play (ie perpendicular to the sheets 16, 18) lower than that tolerated for closure profiles 20, 22.

For this, for example, when the internal surfaces of the sidewalls are parallel as illustrated in the appended figures, the thickness L1 means 100 is greater than that L2 defined by the profiles of closure 20, 22 when these are engaged.

This preferential relationship L1> L2 is not limited to the mode of embodiment of FIG. 1 but applies to all of the modes of realization of the present invention, including when said means sealing 100 are formed by two beads or else means complementary male / female or any other equivalent means, such as we will describe it later.

This provision makes it possible to guarantee that the means 100 provides a watertight barrier between the two films 16 and 18.

According to the embodiment illustrated in FIG. 2, the means sealing 100 are formed by two beads 104, 106 integral respectively of the two films 16 and 18 and placed opposite to come in contact through their tops to form a tight barrier, when they are biased by the sides 52, 54 of the cursor 50. According to FIG. 2, the two beads 104, 106 are symmetrical. Alternatively, however, one can provide beads 104, 106 asymmetrical.

According to the embodiment illustrated in FIG. 3, the means sealing 100 are formed of complementary elements 110, 112 male / female integral respectively with the internal surface of the two sheets 16, 18 of the bag. More precisely still according to FIG. 3, the female element 112 is formed by two lips 1120 and 1122 adapted for come to rest respectively on the sides of the male element 110. According to the Figure 3, the two lips 1120, 1122 are symmetrical. However in alternatively, two asymmetrical lips 1120, 1122 can be provided. Through elsewhere the mixed element 110 is generally rounded.

The sealing means 100 illustrated in FIG. 4 are identical to those of figure 3. However it will be noted that according to figure 4, the cursor 50 has bosses 520 on the internal surface of its sides 52, 54, 540 placed opposite the means 100 to guarantee the solicitation of these last in sealing position, when closing the bag. The geometry of such bosses 520, 540 can be the subject of numerous variants. Alternatively, such bosses can be provided on the surface exterior of the walls 16, 18, facing the cursor, or even such bosses on the walls of the bag and other facing bosses on the cursor 50.

Another variant embodiment according to FIG. 5 has been illustrated. which the male element 110 has a substantially triangular section. Thanks to this structure, it is guaranteed that the contact between the sides of the male element 110 and the lips 1120 and 1122 is reinforced when the male and female elements 110 and 112 are urged into reconciliation by the cursor 50.

Note also that according to Figure 5, the two lips 1120 and 1122 of the female element 112 are asymmetrical. Preferably the lip 1120 located towards the inside of the bag relative to the male element 110 is longer and more flexible than the second lip 1122 located towards the outside from the sachet. Thus the internal pressure of the sachet, or even possibly directly the content thereof, such as liquid content, requests the first lip 1120 resiliently against the male element 110. By cons second lip 1122 resists such an effort and therefore does not deviate of the male element 110.

As illustrated in FIGS. 1 to 6 and 10, the means 100 can come from extrusion on the sheets 16, 18 making up the sachet (more precisely on the internal surface of these sheets 16, 18 according to the modes of realization of FIGS. 1 to 6 and on the external surface of these sheets according to the embodiment of FIG. 10 when the sheets 16, 18 form, at the mouth of the bag, a bellows folded towards the inside of the bag to form an opening control veil).

However, according to an alternative embodiment, the means 100 can be formed initially on respective support webs 121, 123 reported on the sheets 16, 18, at the mouth 12 of the bag, as illustrated in Figures 7 to 9 and 11. Again we note that according to FIGS. 7 to 9, the support webs 121, 123 are fixed to the surface internal of the sheets 16, 18. On the other hand according to FIG. 11, the sheets 16, 18 forming, at the mouth of the bag, a bellows folded towards the inside of the bag to form an opening control veil, the support veils 121, 123 are fixed on the outer surface of the sheets 16, 18.

It will also be noted that, as illustrated in FIGS. 8, 9 and 11, the support sails 121 and 123 can be respectively confused with the support webs 21 and 23 of the closure sections 20, 22.

The connection between the webs 121, 123 and the films 16, 18 can be produced by any suitable conventional means, for example by welding hot or sticking.

The use of non-extrusion means 100 on the films 16, 18, but reported by welding or gluing is not illustrated in the drawings appended only in FIGS. 7 to 9 and 11. However, the use of such means 100 reported on films 16, 18 could apply to the whole variant embodiments in accordance with the invention.

An alternative embodiment has been illustrated in FIG. 6 appended according to laquefle there are provided on the one hand notches 160, 180 which open out on the external surface of the bag, respectively opposite the means 100, in this case respectively opposite the female element 112 and the male element 110, and on the other hand ribs 522 and 542 projecting from the internal surface of the sides 52 and 54 of the cursor 50, which ribs 522 and 542 are adapted to penetrate respectively into said notches 160 and 180.

The cooperation thus defined between the notches 160, 180 and the ribs 522 and 542 makes it possible to improve the stress on the means 100 by the cursor 50. Indeed, it makes it possible to precisely locate the area of stress due to cursor 50. It also makes it possible to retain in all security the cursor 50 on the bag. This cooperation effectively prohibits all inadvertent withdrawal of the cursor 50.

The use of ribs 522 and 542 and complementary notches 160, 180 is illustrated in the accompanying drawings only in FIG. 6. However, the use of such ribs 522 and 542 and notches 160, 180 may apply to all variants of realization in accordance with the invention.

The embodiment of FIG. 7 has been described previously. he essentially differs from the embodiments illustrated on the previous figures by the fact that the means 100 are carried by sails respective support 121, 123 reported on sheets 16 and 18, as indicated previously.

The embodiment of FIG. 8 has been described previously. he essentially differs from the embodiments illustrated on the previous figures by the fact that the means 100 are carried by sails respective support 121, 123 combined with the support webs 21 and 23 of the profiles 20, 22 and reported on sheets 16 and 18, as shown previously.

The same is true for the embodiment illustrated in FIG. 9. However, according to FIG. 9, the support webs 121, 21 and 123, 23 are interconnected by a loop 24. This is arranged on the inside means 100 and has its concavity directed towards the outside of the sachet.

Thus these support sails 121, 21, 123, 23 and 24 form an anti-violation veil or opening indicator at mouth 12. effect of breaking this veil 24 before accessing the interior of the bag. This veil anti-violation 24 is formed by a bellows folded towards the inside of the sachet, at the level of the mouth 12 in the continuity of the support sails 121, 21 and 123, 23.

There are illustrated in Figures 10 and 11 alternative embodiments that such an anti-violation veil or opening witness, referenced 19, is formed by a fold in the film making up the main sheets 16, 18 of the sachet. According to Figure 10 the profiles 20, 22 and the means 100 are come from molding on this film. On the other hand according to FIG. 11, the profiles 20, 22 and the means 100 are carried by support webs 121, 21 and 123, 23 reported on the film.

Such a bellows 19 directed towards the inside of the bag can be shaped by any suitable known means, for example using a blade acting the bellows 19 inwards between the sheets 16, 18, as is good known to those skilled in the art.

Those skilled in the art will readily understand, that conventionally in you have to break the anti-violation veil 24 or 19 to access the product contained in the bag 10.

Thus, the condition of the veil 24 or 19 makes it possible to indicate whether an intervention has whether or not occurred on the bag 10.

In order to facilitate the opening of the veil 24 or 19, it can be provided, in a manner known per se, from a line of weakness or precut, by mid-width example, as illustrated schematically under the reference 190 in Figures 10 and 11.

The sachets obtained in the context of the present invention offer many advantages compared to known prior sachets.

In particular, they allow a high productivity rate and good sealing of the bags.

In addition, the cooperation defined between notches 160, 180 and the ribs 522, 542 of the sliders 50 makes it possible to avoid any untimely withdrawal sliders 50 under the effect of the internal pressure in the sachets or else under the effect of a solicitation by a user.

Where appropriate, in the context of the embodiments illustrated in Figures 10 and 11 for which there is provided an anti-violation veil 19 formed by a fold of the film making up the bags, a weld can be provided between the internal surfaces of the main sheets 16, 18 making up the bag and the sections 162, 182 forming the bellows corresponding to the anti-intrusion veil 19 as shown schematically under the reference 60 in the figures 10 and 11.

Of course, the present invention is not limited to the modes of particular achievements which have just been described, but extends to all variants according to his spirit.

The bags according to the present invention can be produced on all types of known and appropriate machines, in particular on FFS (Form, Fill and Seal) type machines, i.e. machines designed to carry out training operations automatically, filling and closing of sachets.

Furthermore, the present invention applies equally well to in which the closure profiles are arranged longitudinally with reference to the direction of travel of the film only at implementations according to which the closure profiles are arranged transversely.

In addition, the present invention is equally applicable to implementations work according to which, the closing profiles are pre-equipped with slider when fed to the bag forming machine, than implementations where the cursor is arranged later on the profiles.

It will also be noted that the present invention is not imitated the geometry of the notches 160, 180 and ribs 522, 542 illustrated on the Figure 6 attached. Indeed, these notches 160, 180 and ribs 522, 542 can be the subject of numerous variant embodiments as to their straight section. So for example we can consider giving notches 522, 542 a cross section with converging edges, for example in dovetail or rail-shaped (e.g. T-shaped or others). Such a provision reinforces the retention of the cursor 50 on the sachets.

As indicated above, preferably within the framework of the present invention, the sealing means 100 and the profiles of closure 20, 22 extend over the entire width of the bag. However, by definition, the cursor 50 only extends over a limited area of this width. Consequently, the cursor 50 cannot alone solicit the sealing means 100 permanently over their entire length.

As indicated above, to guarantee watertightness, you can consider giving the means 100 a thickness L1 greater than that L2 closure profiles 20, 22.

Other means can be provided to induce a pressure P transverse to the walls 16, 18 on the means 100, in the closed position of the bag to ensure a good seal. This pressure P is shown schematically in Figures 2 and 5. However, these arrangements can still apply to all of the embodiments in accordance with the present invention.

Thus, in the context of the present invention, according to a variant, the closure profiles 20, 22 are adapted to automatically secure such a request P means 100 when the bag is closed.

Different geometries of the closure profiles 20, 22 can be retained for that.

In the case of standard closure profiles male / female as illustrated in FIG. 2, one can for example provide a asymmetrical female profile, in particular such that L3 is less than L4, that is to say that the height or size L3 of the element 220 defining the internal lip of female profile 22 is less than the height or size L4 of element 222 defining the outer lip of the profile female 22.

Those skilled in the art will understand that with this arrangement, the element internal 220 of the female profile 22 induces a constraint on the means sealing 100 in the closed state of the bag, that is to say when the element male 20 is engaged with the female element 22 and this over the entire length means 100.

A similar effect can be obtained with a male profile 20 asymmetrical (combined if necessary with a female profile 22 also asymmetrical as previously indicated).

In the case of additional hook-type closure profiles as illustrated in FIG. 5, one can for example provide that the two additional hooks C1, C2 located towards the inside of the bag define in the assembled position a width L5 between the internal faces sheets 16, 18 less than the width L6 taken between the same faces sheets 16, 18 at the pair of complementary hooks C3, C4 located towards the outside of the bag. This provision ensures the same constraint over the entire length of the means 100.

An alternative embodiment has been illustrated in FIG. 12 according to which the two elements 104, 106 respectively secured to the internal surface sheets 16, 18 are not positioned to bear by their vertex, as indicated previously with regard to FIG. 2, but are positioned to be juxtaposed and come to rest at their sides adjacent opposite 103, 105 generally perpendicular to the sheets 16 and 18.

It will be noted that preferably according to the illustrated embodiments in FIGS. 12 and following, the cursor 50 is provided on the ends of its lateral wings 52, 54, of respective returns 53, 55 directed inwards from the sachet. These returns 53, 55 are positioned to be located beyond the sealing means 100. On the one hand, these returns 53, 55 participate in the tightness of the bag. On the other hand, these returns 53, 55 participate in the keeping the cursor 50 on the sachets to prevent an untimely withdrawal cursor. As can be seen in FIG. 12, these returns 53, 55 request the sheets 16, 18 in approach, beyond the sealing means 100.

It will also be noted that according to the embodiments illustrated on FIGS. 12 et seq., preferably, the portions of support films 16, 18 located opposite the closure profiles 20, 22 and the means sealing 100, have a thickness greater than the thickness of the rest of the film making up the sachet. This extra thickness of the support films 16, 18 to the right of the cursor 50 makes it possible to maintain the means 100 in their sealing position when the bag is in the closed position. Such a localized excess thickness of the films 16, 18 can be obtained in the form of a excess thickness formed during extrusion of the film or else may result from the fixing of supporting webs of closure profiles 20, 22 or of the means 100, as previously indicated.

Another variant embodiment according to FIG. 13 has been illustrated. which the two elements 104, 106 respectively fixed to the surface internal of the sheets 16, 18 are provided at their top with a respective wing 1040, 1060 orthogonal audits elements. Thus said wings 1040, 1060 generally extend parallel to the sheets 16, 18. The elements 104, 106 are supported at their apex by means of these wings 1040, 1060.

According to the embodiment of Figure 13, said wings 1040, 1060 are directed towards the inside of the bag. As a variant, it can be provided that the wings 1040, 1060 are on the contrary directed towards the outside of the bag. according to yet another variant, such wings 1040, 1060 can be provided on the vertex of elements 104, 106 both inward and outward of the bag. In this case, the elements 104, 106 provided with the wings 1040, 1060 have the general shape of a T.

An alternative embodiment of the figure is illustrated in FIG. 14 12 according to which at least one of the two juxtaposed elements 104, 106 is fitted at its top with an orthogonal 1060 wing. This one is intended for come to rest against the internal face of the opposite sheet 16 to perfect sealing. According to Figure 14 there is shown such a wing 1060 on one only elements 106. As a variant, it is however possible to provide a such additional wing intended to come to rest against the internal face of the opposite sheet, on the top of the two elements 104, 106.

FIG. 15 illustrates another alternative embodiment of the Figure 12 according to which the two juxtaposed elements 104, 106 are provided at their apex with a rounded outgrowth 1042, 1062. This is intended to come to rest against the internal face of the sheet 16, 18 opposite to complete the seal. According to Figure 15, there is provided such protuberance on the two elements 104, 106. As a variant, it is possible to provide such a protrusion 1042, 1062 on a single element 104, 106. According to the Figure 15, these growths have a circular cross section and are symmetrical with respect to the median plane of the elements 104, 106. However the invention is not limited to this particular geometry.

An alternative embodiment of the figure is illustrated in FIG. 16 13 according to which the cursor 50 is further provided at the ends from each of the returns 53, 55 from an additional wing 530, 550 directed towards the base 56 of the cursor 50, that is to say towards the outside of the bag. These wings 530, 550 are thus oriented generally parallel to the lateral wings 52, 54 of cursor 50. These additional wings 530, 550 are designed to take position in the volume defined between sheets 16, 18 and 1040, 1060 sealing means 100. It is understood on examination of the figure 16 that these wings 530, 550 ensure an undulation on the sheets 16, 18 suitable for further strengthening the tightness of the bags obtained.

According to the embodiments previously described, the cursor 50 has symmetry with respect to a longitudinal plane. So according to Figures 12 to 14, each of the sides 52, 54 is provided with a return 53, 55.

However according to the variant illustrated in Figure 17, the cursor exhibits an asymmetry in the sense that only one 52 of the flanks is provided of such a return 53 directed towards the inside of the bag.

An alternative embodiment of the figure is illustrated in FIG. 18 17 according to which this return 53 is provided on its internal surface with a boss 532 directed towards the base 56 to urge the two juxtaposed elements 104, 106 supported by their adjacent sides 103, 105. For this, the boss 532 exerts on the element 104 a directed stress to base 56.

Another variant embodiment according to FIG. 19 has been illustrated. which the portions of supporting films 16, 18 carrying the profiles of closure 20, 22 and the sealing means 100 are not located in the direct extension of the leaves making up the body of the sachet, but are shifted towards the outside of the bag at the respective recesses 1600, 1800. These 1600, 1800 recesses can be obtained by extrusion during the manufacture of the film or be obtained subsequently by folding of the film. It will be understood on examining FIG. 19 that such recesses 1600, 1800 make it easier to juxtapose the sheets 16, 18 at the exit of cursor 50, although sheets 16, 18 are necessarily separated, inside the cursor due to the presence closure profiles 20, 22 and means 100.

It will also be noted on examining FIG. 19 that if necessary one of the 1800 recesses can itself be provided with an extension 1802 directed towards the opposite support sheet 16. This extension 1802 is designed to come to rest against the opposite recess 1600 so the further strengthen the tightness of the bags obtained.

FIG. 20 illustrates an alternative embodiment according to which on the one hand there is a boss 530 or return towards the interior of the cursor on the single return 53 and on the other hand an element 106 projecting from the sheet 18. As can be seen in FIG. 20, the boss 530 imposes a bending or labyrinth path to the second sheet 16 at the outlet of the cursor 50, which is again suitable for strengthening the tightness of the sachet obtained.

An alternative embodiment of the figure is illustrated in FIG. 21 12 according to which at least one of the two elements 104 or 106 has a increasing thickness towards its apex or has a flank inclined so that it exerts a force on the other element 106 or 104 juxtaposed, in the closed position of the bag.

We have illustrated in FIGS. 22 and following variants of embodiment according to which the sealing means 100 are formed essentially flexible and elastic structures, to be deformable when closing the bag, while according to the representations given in FIGS. 12 to 21, the means 100 are essentially rigid.

An alternative embodiment according to FIG. 22 has thus been illustrated. which the sealing means 100 comprise a curved lip, flexible and elastic 130 secured to the sheet 18 carrying the profile of female closure 22.

As a variant, such a flexible and elastic lip 130 could be integral with the sheet 16 which carries the male closure profile 20.

According to Figure 22 the lip 130 is formed of a cylinder sector whose angle in the center is greater than 180 °. According to Figure 22, the concavity of the lip 130 is directed towards the inside of the bag. Alternatively however provision could be made for the concavity of the lip 130 to be directed towards the outside of the bag.

As seen in Figure 22, in the closed position of the bag the top of the lip 130 comes to rest against the opposite support sheet 16. For this, as can be seen in FIG. 23, in the open state of the bag, said lip 130 extends beyond the associated closure profile 22. Thanks to this arrangement guarantees that in the closed state of the bag, said lip 130 exerts pressure on the opposite sheet 16.

An alternative embodiment of the figure is illustrated in FIG. 24 22 that the location of the lip 130 and the geometry of this lip 130 are such as said lip 130, when it rests on the sheet 16 opposite, receives a reaction which requests it itself in support against one closure profiles, in this case the female closure profile 22.

Another variant embodiment according to FIG. 25 has been illustrated. which such a biasing of the lip 130 bearing against the element of female closure 22 is reinforced by the presence on the internal surface flanks 52, 54 of the boss cursor 50 520, 540. In the present case according to the representation given in FIG. 25, these bosses 520, 540 have a profile general triangular. However, these bosses 520, 540 are not limited to this geometry and can be the subject of numerous variants of production.

Note that in Figure 25 the central sole of the cursor 50 which controls the engagement, respectively the separation of the profiles of closure 20, 22 is referenced 57.

Illustrated in Figure 26 is a side view of a bag as well team. We can see in this figure 26 a cursor 50 having such stressing bosses 520, 540, as well as closing profiles 20, 22 and the sealing means 100. It will be noted on examining FIG. 26 that preferably the bosses 520, 540 extend only over part of the length of the cursor 50 and also converge towards the upper base 56 of cursor 50 near the end of cursor 50 on the side opening of the bag. Thanks to this arrangement, the bosses 520, 540 stress the lip 130 in abutment against the closure profile 22, in the vicinity of the bag opening area.

Likewise the returns 53, 55 provided on the wings 52, 54 of the cursor 50 can converge on the base 56 near the end of the cursor 50 located on the side of the sachet opening, to improve the tightness of the bag at this level.

Another variant embodiment according to FIG. 27 has been illustrated. each of the two sheets 16, 18 is provided on its internal surface of an elastic lip 130 in the cylinder sector. These two lips 130 are thus resting on their top when the bag is closed.

For that again, at rest, that is to say in the open position, at least one of the two lips 130 preferably extends beyond the profile associated closure, as shown diagrammatically in FIG. 28.

The cursor 50 used in the context of the alternative embodiment of the figure 27 can also include stressing bosses 520, 540 ascending, as illustrated in figure 26, to solicit these lips elastic 130 against the closing profiles 20, 22, in the bag closure.

Another variant embodiment according to FIG. 29 has been illustrated. which each of the two support films 16, 18 is provided with a lip elastic 130, but however these are positioned not for come to rest by their top, but to be juxtaposed laterally as seen in FIG. 29. For this, the two lips 130 formed each of a cylinder sector having an angle at the center greater than 180 ° have their concavity directed inward and inward respectively the outside of the bag.

We will now describe the embodiments illustrated on the Figures 30 to 39 attached.

As previously indicated, according to these variants, the sachet has on its mouth 12, means 150 located opposite said additional sealing means 100, relative to the profiles of closure 20, 22, and these means 150 are adapted to define a support between the opposite internal faces of the walls of the bag. In addition it is planned on the cursor 50 means capable of urging the walls of the sachet, towards inside, in an area of these walls between the means additional sealing 100 and the support means 150. This guarantees that said additional means 100 are solicited in a position sealing, by the slider 50. Preferably this request is made to the right of closing profiles 20 and 22.

Thus preferably as can be seen in the appended figures, the additional sealing means 100 are located on the inside of the profiles closing 20, 22, while the means 150 defining the support are located on the outside of the closure sections 20, 22.

This arrangement comprising means 150 associated with biasing means of the sealing means 100 by the cursor 50, can apply to all of the variants previously described. They are therefore not limited to the embodiments of the figures 30 to 39. In particular this provision applies to all types of means 100, all types of closure profiles 20, 22 and all slider variants 50 or bag equipped with an anti-veil veil, etc ...

A variant has been illustrated in FIG. 30 according to which the means additional sealing 100 are formed by two flexible lips and elastic 170, 172, symmetrical and integral respectively with the face internal walls 16 and 18, and directed towards the inside and the bottom of the bag. In variant these lips 170, 172 can be directed towards the inside of the cursor 50 (especially for example for vacuum bags). As indicated previously the provision of support means 150 applies to all types 100 sealing means and is not limited to the means 100 of the figure 30. It can in particular be applied to lips 170, 172 not symmetrical.

Similarly according to FIG. 30, the closure profiles 20, 22 are of male / female type. However, the invention can be applied to any other type closing profiles, in particular hook profiles.

According to Figure 30, the support means 150 are formed of two symmetrical elements 152, 154, respectively fixed to the faces internal walls 16, 18, at the mouth of the bag. More again precisely according to FIG. 30, each of these elements 152, 154 has a rectangular cross section and extends towards the plane median of the bag at which these elements are in mutual support, in closed position of the bag. Thus these elements 152 and 154 extend generally perpendicular to this median plane.

Note that according to Figure 30, the means 100, the sections 20, 22 and the means 150 have come from material, if necessary from material, from preferably from extrusion, with walls 16, 18. More precisely again it will be noted that the sections of these walls comprised between the means sealing 100 and the support means 150 are thicker than the sheets 16, 18 making up the rest and most of the sachets. So the sections above have a certain rigidity between the means 100 and the means 150.

Those skilled in the art will understand that thanks to the characteristics mentioned above, when the elements 152, 154 are in support and the cursor 50 exerts a stress on the aforementioned sections of the walls 16, 18, located between the means 100 and 150, the sealing means 100 are stressed themselves in their maximum contact and sealing position.

FIG. 31 illustrates the biasing means provided on the slider 50, in the form of bosses 520, 540 provided on the internal surface wings 52, 54, in line with the closure profiles 20, 22. This is here bosses formed by cylindrical caps, but the invention is not limited to this particular geometry.

In FIG. 31, the effort exerted by the cursor 50 is referenced F1. the mouth sections of the bag walls, F2 the reaction due to means 150 and F3 the force then exerted on the sealing means 100.

Note also that according to Figure 31 the aforementioned sections define at the mouth of the bag a cross-section cage rectangular which projects from the main walls 16 and 18 of the bag. In other words, the main walls of the bag are not coplanar with the external surfaces of these sections, but set back inward, relative to them, of a value "d". It is thus defined on the walls 16 and 18 of the bag a recess which serves to support the returns 53 and 55 provided on the wings 52 and 54 of the cursor 50, to avoid a untimely withdrawal of it.

Is illustrated in Figure 32, a variant in which such a dropout is deleted. Thus according to FIG. 32, on the contrary, the walls principal of the sachet are coplanar, at rest, of the external surfaces of the sections located between the means 100 and 150. However, such a variant can also cooperate with a slider 50 equipped with returns 53, 55, on its wings 52, 54 thanks to the authorized deformation of the sheets 16, 18.

According to the variant illustrated in FIG. 33, the aforementioned sections, between the means 100 and 150, define at the mouth of the sachet not a rectangular cross section cage, but a cage globally rounded.

According to Figures 30 to 33 previously described, the elements support 152, 154 are symmetrical and contact each other in the median plane of the bag. Alternatively, however, these elements 152, 154 may be asymmetrical and thus contact each other outside the median plane. So we have illustrated in FIG. 34, a variant according to which only the wall 18 is provided with a support element 154 projecting from its internal face. This element 154 is adapted to come to rest on the internal face of the opposite wall 16.

According to Figures 30 to 34 previously described, the means sealing 100, the closing profiles 20, 22 and the support means 150 came from material, if any material, preferably from extrusion, on the walls 16, 18. As a variant, these different means may have come on respective support sails, by example thermally welded or glued to the inner sides of the sheets 16, 18. These can be respective and separate support sails for each means 100, profiles 20, 22 and means 150, or even sails supports common to several of these means. We have for example illustrated in FIG. 35 an alternative embodiment according to which the means 100, the closure profiles 20, 22 and the support means 150 are carried by two respective sails, one attached to the internal face of the sheet 16, and reported the other on the internal face of the sheet 18.

An alternative embodiment has been illustrated in FIG. 36 according to which the biasing means are formed not of bosses integral with the inner face of the wings of the cursor, but of bosses 15 projecting from the external face of the wall sections situated between the means 100 and 150, of in preference to the closure profiles 20, 22. According to yet another variant it is thus possible to provide bosses both on the cursor and on the walls of the bag.

Another variant embodiment according to FIG. 37 has been illustrated. which the opposite ends of the elements 152 and 154 forming means are widened, to guarantee their support and prevent these elements, by offset do not find themselves adjacent, in which case the arm of expected lever to exercise the solicitation on the means 100 would not got. According to Figure 37 the adjacent ends of the elements 152 and 154 have a generally triangular cross section with a base located in the contact plane. However, the invention is not limited to this special provision.

A variant has been illustrated in FIG. 38 according to which the cursor 50 is fitted on the inner face of its wings 52, 54 with projecting structures 522, 542 of complementary cross section of grooves 13 formed in the aforementioned bosses 15, the structures 522 and 542 being engaged in these grooves 13. More precisely still, the structures 522, 542 are flared, while the grooves 13 have converging edges. Thanks to that provision is avoided an untimely withdrawal of the cursor 50.

Another variant embodiment according to FIG. 39 has been illustrated. which it is thus defined means with complementary forms violates the cursor 50 and the walls of the bag, at the returns 53, 55 formed on the wings 52, 54, in the form of elements 530, 550 as described previously.

Where appropriate, the elements making up the sealing means 100 can be coextruded with the bag and / or the closure profiles, a more flexible material than the material forming the latter. We can by example consider coextruding the lips 170, 172 into a copolymer of ethylene or a synthetic elastomer.

As indicated above, of course, this invention is not limited to the particular embodiments which come to be described, but extends to all variants according to its spirit.

By "sealing" means in the context of the present invention that the means 100 are adapted (according to their geometry and / or their strength support) or to ensure a complete barrier preventing any penetration from the outside to the inside of the bag and any leakage from the inside to the outside of the bag, either to ensure at least one barrier in one direction, ie to prohibit penetration from the outside towards the inside of the bag, or prohibit a leak from the inside to the outside of the bag.

It will also be noted that the return means 53, 55 and the structures such as 522 and 542, provided on the bag and which participate in the keeping the cursor 50 on the sachet, are generally not alone in ensure this maintenance, but for example complete in this function flared means provided on the central sole of the cursor 50.

Those skilled in the art will also understand that in the context of embodiments illustrated in FIGS. 30 to 39, the means sealing 100 may not be placed opposite the sides 52, 54, of the cursor, but outside of it. In other words, in this case, the end of the cursor is located between these means 100 and the profiles of closing 20, 22.

As indicated above, according to an alternative embodiment, the sole 59 is interrupted below (that is to say behind) the end longitudinal of the cursor, at least on the widest side of the cursor corresponding to the divergent side of the lanes 590, 592, as seen in particular in FIGS. 40, 42, 43 and 44, and the lateral wings 52, 54 are provided near their free edge opposite the base 56, means 520, 540 for soliciting sheets 16, 18 of the sachet in reconciliation, covering the entire longitudinal extent of the sole 59 and extending beyond longitudinally on either side of it, to ensure the watertightness of the sachet in the closed position thereof.

According to the preferred embodiment illustrated in Figures 40 to 43, these biasing means are composed of ribs 520, 540 in inward projection of the cursor 50, at the edge of the wings 52, 54 opposite the base 56, or where appropriate over part of the height of the internal surface of these wings 52, 54 lying between the free edge of the wings 52, 54 and the base 56. It will be noted that if the ribs 520, 540 are not necessarily located at the free edge of the lateral wings 52, 54, these ribs 520, 540 are however located below the sole 59 (that is to say between the top of the sole 59, opposite the base 56, and the free edge of the wings 52, 54), and not at the height thereof.

These ribs 520, 540 continuously cover the sole 59 and extend beyond it, at least at the most wide of the sole 59 corresponding to the divergent side of the corridors 590, 592. More precisely still, according to the preferred embodiment illustrated in the appended figures, the ribs 520, 540 extend over all the length of the slider 50, while the sole 59 is interrupted, at the level of its widest end (divergent side of the corridors 590, 592), at a distance I1 from the end of the cursor 50, and at its level thinner end (converging side of lanes 590, 592), one distance I2 from the end of the cursor 50.

The width 16 of the free space defined between the vertices of the ribs 520, 540 is substantially equal to the sum of the thicknesses of the sheets 16, 18, at the mouth of the sachets. So the cursor 50 solicits the sheets in approach, below the sole 59, and guarantees the tightness of the sachet.

According to the embodiment illustrated in Figures 40 to 44 annexed, two symmetrical ribs 520, 540 are provided and likewise height, one on each of the wings 52, 54. As a variant, provision may be made ribs 520, 540 asymmetrical. So we can only plan one single rib on one of the wings 52, 54 of the cursor 50.

• 13 la hauteur de la semelle 59, considérée parallèlement aux ailes 52, 54 et perpendiculairement à l'embase 56,
• 14 la distance séparant l'extrémité libre de la semelle 59 opposée à l'embase 56 et les nervures 520, 540, et
• I5 la largeur de la semelle 59, au niveau de son extrémité la plus large.

In the figures, reference has been made:

• 13 the height of the sole 59, considered parallel to the wings 52, 54 and perpendicular to the base 56,
• 14 the distance separating the free end of the sole 59 opposite the base 56 and the ribs 520, 540, and
• I5 the width of the sole 59, at its widest end.

• I1 est de préférence compris entre 1mm et 10mm, et est très préférentiellement de l'ordre de 3mm.
• I2 est de préférence compris entre 0,5mm et 10mm, et est très préférentiellement de l'ordre de 4mm.
• I3 est de préférence compris entre 2mm et 7mm, et est très préférentiellement de l'ordre de 3mm.
• I4 est de préférence compris entre 5mm et 15mm, et est très préférentiellement de l'ordre de 8mm.
• I5 est de préférence compris entre 0,3mm et 2mm, et est très préférentiellement de l'ordre de 0,5mm.
• I6 est de préférence compris entre 50µm et 2,5mm, et est très préférentiellement de l'ordre de 200µm.

In the context of the present invention:

• I1 is preferably between 1mm and 10mm, and is very preferably of the order of 3mm.
• I2 is preferably between 0.5mm and 10mm, and is very preferably around 4mm.
• I3 is preferably between 2mm and 7mm, and is very preferably around 3mm.
• I4 is preferably between 5mm and 15mm, and is very preferably around 8mm.
• I5 is preferably between 0.3mm and 2mm, and is very preferably around 0.5mm.
• I6 is preferably between 50 μm and 2.5 mm, and is very preferably of the order of 200 μm.

• le rapport I1/I5 est de préférence compris entre 0,5 et 30, et est très préférentiellement de l'ordre de 6.
• le rapport I2/I5 est de préférence compris entre 2,5 et 30, et est très préférentiellement de l'ordre de 8.
• le rapport I1/I3 est de préférence compris entre 0,5 et 5, et est très préférentiellement de l'ordre de 1.
• le rapport I2/I3 est de préférence compris entre 0,1 et 5, et est très préférentiellement de l'ordre de 1,3.
• le rapport I1/I4 est de préférence compris entre 0,05 et 2, et est très préférentiellement de l'ordre de 0,4.
• le rapport I2/I4 est de préférence compris entre 0,05 et 2, et est très préférentiellement de l'ordre de 0,5.

Furthermore, in the context of the present invention:

• the ratio I1 / I5 is preferably between 0.5 and 30, and is very preferably of the order of 6.
• the I2 / I5 ratio is preferably between 2.5 and 30, and is very preferably around 8.
• the ratio I1 / I3 is preferably between 0.5 and 5, and is very preferably of the order of 1.
• the I2 / I3 ratio is preferably between 0.1 and 5, and is very preferably around 1.3.
• the ratio I1 / I4 is preferably between 0.05 and 2, and is very preferably of the order of 0.4.
• the ratio I2 / I4 is preferably between 0.05 and 2, and is very preferably around 0.5.

Claims (105)

1. Bag comprising two generally parallel sheets (16, 18) forming the main walls of the bag, complementary closure strips (20, 22) fixed to respective ones of the sheets and a slider (50) for actuating the strips (20, 22) for closing and opening purposes, characterized in that it further comprises, parallel to the closure strips (20, 22), between the said sheets (16, 18) and at the mouth (12) of the bag, additional means in relief (100) disposed on the interior surface of at least one sheet of the bag towards the inside of the bag with respect to the closure strips (20, 22) designed to provide sealing by forming a barrier between the sheets (16, 18) when the bag is in the closed position, the said additional means in relief (100) being designed to be urged towards their sealing position by the slider (50) when the slider is moved towards the position for closing the bag.
2. Bag according to Claim 1, characterized in that the additional means in relief providing sealing (100) are made up of at least one bead (102; 104, 106) secured to the interior surface of one sheet (16) of the bag.
3. Bag according to one of Claims 1 and 2, characterized in that the additional means in relief providing sealing (100) are made up of two beads (104, 106) secured to a respective one of the interior surfaces of the two sheets (16, 18) of the bag.
4. Bag according to Claim 1, characterized in that the additional means in relief providing sealing (100) are made up of complementary male/female elements (110, 112) secured to respective ones of the interior surfaces of the two sheets (16, 18) of the bag.
5. Bag according to Claim 4, characterized in that the male element (110) is substantially triangular in section.
6. Bag according to one of Claims 4 and 5, characterized in that the two lips (1120 and 1122) of the female element (112) are asymmetric.
7. Bag according to one of Claims 4 to 6, characterized in that the lip (1120) of the female element (112) situated towards the insideiof the bag with respect to the male element (110) is longer and more flexible than the second lip (1122) situated towards the outside of the bag.
8. Bag according to one of Claims 1 to 7, characterized in that the additional means in relief providing sealing (100) extend over the entire length of the bags.
9. Bag according to one of Claims 1 to 8, characterized in that the geometry of the strips (20, 22) of the additional means (100) and of the slider (50) is such that the flanks (52, 54) of the slider (50) impose on the means (100) transverse play which is smaller than that tolerated for the closure strips (20, 22).
10. Bag according to one of Claims 1 to 9, characterized in that the interior surfaces of the flanks (52, 54) of the slider (50) are parallel and the thickness (L1) of the means (100) is greater than that (L2) defined by the closure strips (20, 22) when they are in engagement.
11. Bag according to one of Claims 1 to 10, characterized in that the slider (50) has, on the interior surface of its flanks (52, 54), bosses (520, 540) placed facing the means (100) to guarantee that these are urged towards the sealing position when the bag is closed.
12. Bag according to one of Claims 1 to 11, characterized in that the walls of the bag have bosses placed facing the means (100) and facing the flanks of the slider (50) to guarantee that the means (100) are urged into the sealing position when the bag is closed.
13. Bag according to one of Claims 1 to 12, characterized in that it comprises, on the one hand, notches (160, 180) which open onto the exterior surface of the bag, respectively facing the means (100) and, on the other hand, ribs (522 and 542) projecting from the interior surface of the flanks (52 and 54) of the slider (50), which ribs (522 and 542) are designed to enter the said notches (160 and 180) respectively.
14. Bag according to one of Claims 1 to 13, characterized in that it comprises means (19, 29) forming a tamperproofing or tamper-evident web at the mouth (12).
15. Bag according to Claim 14, characterized in that the tamperproofing web (24) is formed of a bellows folded towards the inside of the bag, at the mouth (12) in the continuity of support webs (121, 21 and 123, 23) of the closure strips or of the additional sealing means.
16. Bag according to Claim 14, characterized in that the tamperproofing web (19) is formed of a bellows folded towards the inside of the bag, at the mouth (12) in the continuity of the film of which the bag is made.
17. Bag according to one of Claims 1 to 16, characterized in that the bag (10) is formed of a single film which is folded onto itself at the bottom (14) of the bag.
18. Bag according to one of Claims 1 to 16, characterized in that the bag (10) is formed of a single film folded onto itself at the mouth (12) of the bag.
19. Bag according to one of Claims 1 to 16, characterized in that the bag (10) is made from two sheets (16, 18) which are initially separate and are superposed during manufacture.
20. Bag according to one of Claims 1 to 19, characterized in that the complementary closure strips (20, 22) and/or the additional sealing means (100) are extruded together with the sheets (16, 18) of which the bag is made.
21. Bag according to one of Claims 1 to 19, characterized in that the complementary closure strips (20, 22) and/or the additional sealing means (100) are initially formed on respective support webs (21, 23; 121, 123) which are attached to the sheets (16, 18) at the mouth (12) of the bag.
22. Bag according to one of Claims 1 to 19 and 21, characterized in that the complementary closure strips (20, 22) and the additional sealing means (100) are initially formed on common support webs (21, 23; 121, 123) which are attached to the sheets (16, 18) at the mouth (12) of the bag.
23. Bag according to one of Claims 1 to 22, characterized in that the closure strips (20, 22) are designed automatically to urge the means (100) transversely (P) when the bag is closed.
24. Bag according to one of Claims 1 to 23, characterized in that the complementary closure strips (20, 22) are of the male/female type and in that they comprise at least one asymmetric male or female strip.
25. Bag according to Claim 24, characterized in that the height or bulk (L3) of the element (220) defining the interior lip of the female strip (22) is less than the height or bulk (L4) of the element (222) defining the exterior lip of the female strip (22).
26. Bag according to one of Claims 1 to 23, characterized in that the complementary closure strips (20, 22) are of the hook type and in that they have at least two pairs of complementary hooks defining widths in the assembled position which differ from one pair of hooks to the other.
27. Bag according to Claim 26, characterized in that the two complementary hooks (C1, C2) situated towards the inside of the bag define, in the assembled position, a width (L5) between the interior faces of the sheets (16, 18) which is less than the width L5 measured between the same faces of the sheets (16, 18) at the pair of complementary hooks (C3, C4) situated towards the outside of the bag.
28. Bag according to one of Claims 1 to 27, characterized in that the additional means in relief providing sealing (100) are made up of two elements (104, 106) secured to the respective interior surfaces of the two sheets (16, 18) of the bag and intended to bear against each other via their tips.
29. Bag according to one of Claims 1 to 27, characterized in that the additional means in relief providing sealing (100) are made up of two elements (104, 106) secured to the respective interior surfaces of the two sheets (16, 18) of the bag and intended to be juxtaposed and to bear against each other at their adjacent facing flanks (103, 105) which on the whole are perpendicular to the sheets (16 and 18).
30. Bag according to one of Claims 1 to 27, characterized in that the slider (50) is equipped on the ends of at least one of its lateral flanges (52, 54), with a return (53, 55) directed towards the inside of the bag and positioned so that they are situated beyond the sealing means (100).
31. Bag according to Claim 30, characterized in that the slider (50) is also equipped, at the end of this return (53, 55), with an additional flange (530, 550) directed towards the base (56) of the slider (50), that is to say towards the outside of the bag.
32. Bag according to one of Claims 1 to 31, characterized in that the portions of support films (16, 18) situated facing the closure strips (20, 22) and facing the sealing means (100) are thicker than the remainder of the film of which the bag is made.
33. Bag according to Claim 32, characterized in that the localized extra thickness of the films (16, 18) is obtained in the form of an extra thickness formed during extrusion of the film.
34. Bag according to Claim 32, characterized in that the local extra thickness of the films (16, 18) results from the attachment of support webs supporting the closure strips (20, 22) or the means (100).
35. Bag according to one of Claims 3 and 28, characterized in that the two elements (104, 106) secured to respective ones of the interior surfaces of the sheets (16, 18) are equipped at their tips with at least one respective flange (1040, 1060) orthogonal to the said elements.
36. Bag according to one of Claims 3 and 29, characterized in that at least one of the two elements (104, 106) provided on the support sheets is equipped at its tip with an orthogonal flange (1060) intended to rest against the interior face of the opposite sheet (16).
37. Bag according to one of Claims 3 and 29, characterized in that at least one of the two elements (104, 106) provided on the support sheets is equipped at its tip with a rounded bulge (1042, 1062).
38. Bag according to Claim 31, characterized in that the slider (50) is also provided, at the end of this return (53, 55), with a boss (532) directed towards the base (56) so as to urge the two juxtaposed elements (104, 106) to bear against each other via their adjacent flanks (103, 105).
39. Bag according to one of Claims 1 to 38, characterized in that the support film portions (16, 18) carrying the closure strips (20, 22) and the sealing means (100) are not situated directly in line with the sheets of which the body of the bag is made, but are offset towards the outside of the bag via respective steps (1600, 1800).
40. Bag according to Claim 39, characterized in that one of the steps (1800) is itself equipped with an extension (1802) directed towards the opposite support sheet (16).
41. Bag according to one of Claims 3 aid 29, characterized in that at least one of the two elements (104 or 106) has a thickness that increases towards its tip or has an inclined flank so that it exerts a force on the juxtaposed other element (106 or 109) when the bag is in the closed position.
42. Bag according to one of Claims 1 to 41, characterized in that the sealing means (100) comprise structures which are flexible and resilient so that they can be deformed when the bag is closed.
43. Bag according to one of Claims 1 to 42, characterized in that the sealing means (100) comprise at least one curved, flexible and resilient lip (130) secured to the sheet (18) carrying one of the closure strips (22).
44. Bag according to Claim 43, characterized in that the lip (130) is formed of a sector of a cylinder subtending an angle in excess of 180°.
45. Bag according to one of Claims 43 and 44, characterized in that when the bag is in the open state, the said lip (130) extends beyond the associated closure strip (22) so that when the bag is in the closed state, the said lip (130) exerts pressure on the opposite strip (16).
46. Bag according to one of Claims 43 to 45, characterized in that the location of the lip (130) and the geometry of this lip (130) are such that the said lip (130), when resting against the opposite sheet (16), receives a reaction which urges it itself to bear against one of the closure strips.
47. Bag according to Claim 46, characterized in that the urging of the lip (130) to bear against the female closure element (22) is strengthened by the presence, on the interior surface of the flanks (52, 54) of the slider (50), of bosses (520, 540).
48. Bag according to Claim 47, characterized in that the bosses (520, 540) converge towards the top base (56) of the slider (50) ongoing towards the end of the slider (50) which is situated towards the open end of the bag.
49. Bag according to one of Claims 1 to 48, characterized in that each of the two sheets (16, 18) is equipped on its interior surface with a resilient lip (130) in the form of a sector of a cylinder, which lips are designed to bear against each other via their tips when the bag is closed.
50. Bag according to one of Claims 1 to 48, characterized in that each of the two sheets (16, 18) is equipped on its interior surface with a resilient lip (130) in the form of a sector of a cylinder, which lips are designed to be juxtaposed laterally.
51. Bag according to one of Claims 1 to 50, characterized in that it comprises, at its mouth (12), means (150) situated on the opposite side of the closure strips (20, 22) to the said additional sealing means (100) and which are designed to define a region where the opposite internal faces of the walls of the bag can rest together, and there are provided on the slider (50) means (520, 540) capable of urging the walls of the bag inwards in a region of these walls that lies between the additional sealing means (100) and the bearing means (150).
52. Bag according to Claim 51, characterized in that urging is in line with the closure strips (20, 22).
53. Bag according to one of Claims 51 and 52, characterized in that the additional sealing means (100) lie on the inside of the closure strips (20, 22), while the means (150) defining the bearing region are situated on the outside of the closure strips (20, 22).
54. Bag according to one of Claims 51 to 53, characterized in that the additional sealing means (100) are formed of two flexible and resilient lips (170, 172).
55. Bag according to one of Claims 51 to 54, characterized in that the bearing means (150) are formed of two elements (152, 154) secured to respective ones of the internal faces (16, 18) at the mouth of the bag.
56. Bag according to Claim 55, characterized in that these elements (152, 154) bear against each other, when the bag is in the closed position, in the mid-plane thereof.
57. Bag according to Claim 55, characterized in that these elements (152, 154) bear against each other, when the bag is in the closed position, away from the mid-plane thereof.
58. Bag according to one of Claims 51 to 57, characterized in that the bearing means (150) are formed of the same material or, as appropriate, materials, preferably by extrusion, with the walls (16, 18) of the bag.
59. Bag according to one of Claims 51 to 57, characterized in that the bearing means (150) are formed of the same material or, as appropriate, materials, preferably by extrusion, on support webs which are attached, for example by welding or bonding, to the walls (16, 18) of the bag.
60. Bag according to one of Claims 51 to 59, characterized in that the portions of the walls lying between the sealing means (100) and the bearing means (150) are thicker than the sheets (16, 18) of which the remainder and most of the bags are made.
61. Bag according to one of Claims 51 to 60, characterized in that the urging means comprise bosses (520, 540) on the interior surface of the flanges (52, 54) of the slider (50).
62. Bag according to one of Claims 51 to 61, characterized in that the urging means comprise bosses on the walls of the bag.
63. Bag according to one of Claims 61 and 62, characterized in that the bosses (520, 540) are provided in line with the closure strips (20, 22).
64. Bag according to one of Claims 51 to 63, characterized in that the facing ends of the elements (152, 154) forming bearing means are enlarged, for example having a cross section that is generally triangular.
65. Bag according to one of Claims 1 to 64, characterized in that the elements that make up the sealing means (100) are coextruded with the bag and/or the closure strips, of a material which is more flexible than the material of which this bag or these strips are made, for example of a copolymer of ethylene or a synthetic elastomer.
66. Bag according to one of Claims 1 to 65, characterized in that the said additional means in relief are placed facing the flanks of the slider.
67. Film for making a bag according to one of Claims 1 to 66, characterized in that it comprises complementary closure strips (20, 22) that can be actuated by a slider (50) and additional means in relief (100) arranged on the interior surface of the film, towards the inside of the bag with respect to the closure strips (20, 22), designed to provide sealing by forming a barrier between the sheets (16, 18) that are to form the bag, when the bag is in the closed position.
68. Film according to Claim 67, characterized in that the additional means in relief providing sealing (100) are made up of at least one bead (102; 104, 106).
69. Film according to one of Claims 67 and 68, characterized in that the additional means in relief providing sealing (100) are made up of two beads (104, 106).
70. Film according to Claim 67, characterized in that the additional means in relief providing sealing (100) are made up of complementary male/female elements (110, 112).
71. Film according to Claim 70, characterized in that the male element (110) is substantially triangular in section.
72. Film according to one of Claims 70 and 71, characterized in that the two lips (1120 and 1122) of the female element (112) are asymmetric.
73. Film according to Claim 67, characterized in that the additional means in relief providing sealing (100) are made up of elements (104, 106) intended to be juxtaposed and to bear against one another at their facing adjacent flanks (103, 105) which on the whole are perpendicular to the sheets (16 and 18).
74. Film according to Claim 67, characterized in that the additional means in relief providing sealing (100) comprise at least one curved, flexible and resilient lip (130).
75. Film according to one of Claims 67 to 74, characterized in that it comprises means (150) situated on the opposite side of the closure strips (20, 22) to the said additional sealing means (100) and designed to define a region in which the opposite internal faces of the walls of the bag can bear against each other.
76. Extruded tape for producing a bag according to one of Claims 1 to 66, characterized in that it comprises means in relief (100) arranged towards the inside of the bag with respect to the closure strips (20, 22), designed to provide sealing by forming a barrier between the sheets (16, 18) intended to form the bag, when the bag is in the closed position.
77. Tape according to Claim 76, characterized in that it further comprises at least one closure strip (20, 22) that can be actuated by a slider (50) on a support web common to the said means in relief (100).
78. Tape according to one of Claims 76 and 77, characterized in that the means in relief providing sealing (100) are made up of at least one bead (102; 104, 106).
79. Tape according to one of Claims 76 to 78, characterized in that the means in relief providing sealing (100) are made up of two beads (104, 106).
80. Tape according to one of Claims 76 and 77, characterized in that the means in relief providing sealing (100) are made up of male/female elements (110, 112).
81. Tape according to Claim 80, characterized in that the male element (110) is substantially triangular in section.
82. Tape according to one of Claims 80 and 81, characterized in that the two lips (1120 and 1122) of the female element (112) are asymmetric.
83. Tape according to one of Claims 76 to 82, characterized in that the additional means in relief providing sealing (100) are made up of elements (104, 106) intended to be juxtaposed and to bear on one another at their facing adjacent flanks (103, 105) which on the whole are perpendicular to the sheets (16 and 18).
84. Tape according to one of Claims 76 to 83, characterized in that the additional means in relief providing sealing (100) comprise at least one curved, flexible and resilient lip (130).
85. Tape according to one of Claims 76 to 84, characterized in that it comprises means (150) situated on the opposite side of the closure strips (20, 22) to the said additional sealing means (100) and designed to define a region at which the opposed internal faces of the walls of the bags can bear against each other.
86. Bag according to one of Claims 1 to 66 comprising two generally parallel sheets (16, 18) forming the main walls of the bag, complementary closure strips (20, 22) fixed respectively to these sheets (16, 18) at the mouth of the bag and a slider (50) comprising two lateral flanges (52, 54) connected at a base (56) and which are placed over the outside of the sheets (16, 18) at the mouth of the bag and which, with an elongate central tongue (59), define two convergent passages (590, 592) for the complementary closure strips (20, 22), the bag being characterized in that the tongue (59) is interrupted and setback from the longitudinal end of the slider (50), at least on the widest side of the slider corresponding to the divergent side of the passages (590, 592), and in that the lateral flanges (52, 54) are equipped, near their free edges remote from the base (56), with means (520, 540; 100) for urging the sheets (16, 18) of the bag together, covering the entire longitudinal span of the tongue (59) and extending longitudinally beyond it at each end, so as to seal the bag when the bag is in the closed position.
87. Bag according to Claim 86, characterized in that the urging means are made up of ribs (520, 540) projecting towards the inside of the slider (50), at the opposite end of the flanges (52, 54) to the base (56), or over part of the height of the interior surface of these flanges (52, 54) lying between the free edge of the flanges (52, 54) and the base (56).
88. Bag according to Claim 87, characterized in that the ribs (520, 540) are situated under the tongue (59) and not level therewith.
89. Bag according to one of Claims 87 and 88, characterized in that the ribs (520, 540) extend over the entire length of the slider (50), while the tongue (59) is interrupted, at its widest end, at a distance (11) from the end of the slider (50).
90. Bag according to one of Claims 86 to 89, characterized in that the tongue (59) is also interrupted at its narrowest end (the convergent end of the passages (590, 592)), at a distance (12) from the end of the slider (50).
91. Bag according to one of Claims 87 to 90, characterized in that the width (16) of the empty space defined between the tips of the ribs (520, 540) is substantially equal to the sum of the thicknesses of the sheets (16, 18) at the mouth of the bags.
92. Bag according to one of Claims 87 to 91, characterized in that the slider comprises two ribs (520, 540) which are symmetric and the same height, one on each of the flanges (52, 54).
93. Bag according to one of Claims 87 to 91, characterized in that the slider (50) comprises asymmetric ribs (520, 540) or a single rib on one of the flanges (52, 54) of the slider (50).
94. Bag according to one of Claims 86 to 93, characterized in that the distance (I1) separating the wide end of the tongue (59) and the end of the slider is between 1 mm and 10 mm and preferably of the order of 3 mm.
95. Bag according to one of Claims 86 to 94, characterized in that the distance (I2) separating the thin end of the tongue (59) and the end of the slider is between 0.5 mm and 10 mm and is very preferably of the order of 4 mm.
96. Bag according to one of Claims 86 to 95, characterized in that the height (I3) of the tongue (59) is between 2 mm and 7 mm and is preferably of the order of 3 mm.
97. Bag according to one of Claims 86 to 96, characterized in that the distance (I4) separating the tip of the tongue (59) and the urging means (520, 590) is between 5 mm and 15 mm and is very preferably of the order of 8 mm.
98. Bag according to one of Claims 86 to 97, characterized in that the thickness (I5) of the tongue (59) at its wide end is between 0.3 mm and 2 mm and is preferably of the order of 0.5 mm.
99. Bag according to one of Claims 86 to 98, characterized in that the width (I6) of the opening formed between the urging means (520, 540) is between 50 µm and 2.5 mm and is very preferably of the order of 200 µm.
100. Bag according to one of Claims 86 to 99, characterized in that the ratio (I1/I5) between the distance (I1) separating the wide end of the tongue (59) and the end of the slider and the thickness (I5) of the tongue (59) at its wide end is preferably between 0.5 and 30 and is very preferably of the order of 6.
101. Bag according to one of Claims 86 to 100, characterized in that the ratio (I2/I5) between the distance (I2) separating the thin end of the tongue (59) and the end of the slider and the thickness (I5) of the tongue (59) at its wide end is preferably between 2.5 and 30 and is very preferably of the order of 8.
102. Bag according to one of Claims 86 to 101, characterized in that the ratio (I1/I3) between the distance (I1) separating the wide end of the tongue (59) and the end of the slider and the height (I3) of the tongue (59) is preferably between 0.5 and 5 and is very preferably of the order of 1.
103. Bag according to one of Claims 86 to 102, characterized in that the ratio (I2/I3) between the distance (I2) separating the thin end of the tongue (59) and the end of the slider and the height (I3) of the tongue (59) is preferably between 0.1 and 5 and is very preferably of the order of 1.3.
104. Bag according to one of Claims 86 to 103, characterized in that the ratio (I1/I4) between the distance (I1) separating the wide end of the tongue (59) and the end of the slider and the distance (I4) separating the tip of the tongue (59) and the urging means (520, 540) is preferabl between 0.05 and 2 and is very preferably of the order of 0.4.
105. Bag according to one of Claims 86 to 104, characterized in that the ratio (I2/I4) between the distance (I2) separating the thin end of the tongue (59) and the end of the slider and the distance (I4) separating the tip of the tongue (59) and the urging means (520, 540) is preferably between 0.05 and 2 and is very preferably of the order of 0.5.

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