EP1003395A1

EP1003395A1 - Bag comprising matching closing sections actuated by a slider

Info

Publication number: EP1003395A1
Application number: EP99925120A
Authority: EP
Inventors: Henri Georges Bois
Original assignee: Flexico France SARL
Current assignee: Flexico France SARL
Priority date: 1998-06-17
Filing date: 1999-06-17
Publication date: 2000-05-31
Anticipated expiration: 2019-06-17
Also published as: US20020034340A1; US6902321B2; CA2296748A1; DK1003395T3; NZ502297A; FR2780037A1; US20020034342A1; US7517150B2; US6632021B2; US20050286809A1; EP1003395B1; US20020034343A1; AU760238B2; FR2780037B1; ATE216567T1; DE69901328D1; ES2174612T3; US7140772B2; FR2780039B1; AU4151699A

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

BAG INCLUDING ADDITIONAL CLOSING CLOSURE PROFILES

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

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

These bags activated at the opening and closing by a slider have already rendered great services

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

However, the majority of known slider sachets are not entirely satisfactory. In particular, most of these sachets do not have total tightness in the closed position of the profiles. This leakage is due to the fact that the profiles remain separate, in front of the cursor

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

We have tried to remedy this drawback by proposing closure profiles having a 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 the profiles on their entire length, in the closed position

However, the means proposed in this context prove to be very complex. They do not always allow perfect sealing of the sachets. In addition, they have the major drawback of not retaining the cursor perfectly and consequently of causing, for example, a risk. that the cursor is 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 known prior sachets

Another object of the present invention is to propose means limiting the risk of inadvertent withdrawal 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 by means of a bag comprising two generally parallel sheets forming the main walls of the bag, complementary closure profiles fixed respectively to these sheets and a slider for actuating the profiles at closure and at opening, characterized in that it further comprises, parallel to the closure profiles, between said sheets and at the mouth of the bag, additional relief means arranged on the inside of the closure profiles, designed to sealing by forming a barrier between the sheets, in the closed position of the bag, said additional raised means being adapted to be urged towards their sealing position by the cursor when the cursor is moved to the closed position of the bag

According to certain embodiments, said additional relief means are placed opposite 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 secured to the internal surface of a sheet of the sachet, or even of two symmetrical bulges respectively secured to the internal surface of the two sheets of the bag, or additional male / female elements respectively secured to the internal surface of the two sheets of the bag

According to another advantageous characteristic of the present invention, the bag comprises on its mouth, means situated opposite said additional sealing means, relative to the closure profiles, and adapted to define a support between the opposite internal faces of the walls of the bag and it is provided on the cursor means able to urge the walls of the bag, inwards, in a zone of these walls between the additional sealing means and the support means. This guarantees that said additional means are urged in a sealing position, by the cursor Preferably this request is made in line with the closing profiles

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

According to another advantageous characteristic of the present invention, the bag comprises two generally parallel sheets forming the main walls of the bag, complementary closure profiles fixed respectively on these sheets at the mouth of the bag and a slider comprising two side wings connected between them at a base, placed on the outside of the sheets at the mouth of the bag and which define with an elongated central sole, two converging passageways for the complementary closure profiles and the bag is characterized by the fact that the sole is interrupted back from the longitudinal end of the slider, at least on the widest side of the slider corresponding to the divergent side of the passage lanes, and that the lateral wings are provided in the vicinity of their opposite free edge at the base, means for urging the sheets of the sachet in close proximity, c opening the entire longitudinal extent of the sole and extending beyond it longitudinally on either side thereof, to ensure the tightness of the bag in the closed position thereof Other characteristics, purposes 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 according to a first embodiment of the present invention,

FIGS. 2 to 1 1 illustrate, in 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,

- Figures 30 to 39 illustrate a third series of alternative embodiments in accordance with the present invention, - Figures 40 to 42 show three schematic cross-sectional views of a bag fitted with a slider in accordance with the present invention, according to views referenced respectively ll, ll-ll and lll-lll in FIG. 43,

- Figure 43 shows a view in longitudinal center section of a cursor according to the present invention, according to the sectional plane referenced

IV- IV in Figures 40 to 42, and

- Figure 44 shows another view in longitudinal section of the cursor along the section plane referenced V-V in Figure 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 joined together as shown in Figures 1 to 3, or by welding or bonding, the two sheets 16, 18 being initially separated and superimposed during manufacture as illustrated in FIGS. 4 to 9, or else by welding or bonding the edges of a single sheet folded back on itself at the level of the mouth , as illustrated for example in FIGS. 10 and 11), as well as at the two lateral edges perpendicular to the bottom 14 and to the mouth 12 (the connection at the lateral edges is preferably ensured by welding or gluing)

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

These complementary closure sections 20, 22 can be the subject of numerous embodiments. The invention is not limited to the precise embodiments illustrated in the appended figures. It will also be noted that the figures have been illustrated in the figures. appended two alternative embodiments 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 hand

In particular, the invention applies to closure profiles 20,

22 of the male and female type respectively as is well known to those skilled in the art and as shown diagrammatically in FIGS. 1 to 3 and 12 et seq. But the invention is not limited to this particular arrangement and can also extend for example to closure profiles 20, 22 of the hook type as illustrated in FIGS. 4 to 11

As illustrated in FIGS. 1, 3 to 7 and 10 in particular the complementary closure profiles 20, 22 may have come from extrusion on the sheets 16, 18 making up the bag (more precisely on the internal surface of these sheets 16, 18 according to the embodiments of FIGS. 1 and 3 to 7 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 sachet, a bellows folded inwards from the bag to form an opening veil)

However, according to an alternative embodiment, the closure profiles 20, 22 can be formed initially on respective support webs 21, 23 attached to the sheets 16, 18, at the mouth 12 of the bag, as has been illustrates 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 FIG. 11, the sheets 16, 18 forming, at the mouth of the sachet, a bellows folded inwardly of the sachet to form an opening control 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 achieved by any suitable conventional means, for example by hot welding or gluing

The use of closure profiles not extruded from the films 16, 18, but reported by welding or gluing is illustrated in 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 indicated above in the context of the present invention, the bag further comprises on the one hand a slider 50 adapted to actuate the profiles 20, 22 when 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 relief means 100 designed to ensure sealing by forming a barrier between the sheets 16, 18, in position for closing the bag, said additional relief means 100 being placed opposite the sides 52, 54 of the cursor 50 to be urged 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 conventional embodiments. The cursor 50 can in particular conform to the provisions described in document EP-A-0479661.

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

Note, however, that preferably the cursor 50, made of plastic, has two lateral wings 52, 54 (or "sides") connected to each other at a base 56 and which define with an elongated central sole (not shown in the appended figures at the location of the illustrated cutting plane) two converging passage lanes for complementary nestable closure profiles 20, 22 Thus, when the relative direction of movement of the cursor 50 relative to the closure profiles 20, 22 tends to move the cursor 50 by 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

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

100 are arranged on the inside of the closing profiles 20, 22 (that is to say towards the inside of the bags relative to these closing profiles 20,

22) and extend over the entire length of the bags (i.e. they 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 of a bead 102 parallel to the profile 20 and integral with one of the sheets 16 According to Figure 1 this bead 102 came from extrusion on the film 16 As a variant, however, as mentioned above, the bead 102 could have come from extrusion on a support veil attached to this film 16

Such a bead 102 is placed opposite the sides 52, 54 of the cursor 50 and on the inside thereof. Thus the bead 102 is pressed against the opposite film 18 when the cursor 50 is moved to the closed position.

Preferably the geometry of the sections 20, 22, of the means 100 and of the slider 50 is such that the sides 52, 54 of the slider 50 impose on the means 100, a transverse clearance (perpendicular to the sheets 16, 18) less than that tolerated for the closing 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 of the means 100 is greater than that L2 defined by the closing profiles 20, 22 when these are in engagement

This preferential relationship L1> L2 is not limited to the embodiment of FIG. 1 but applies to all of the embodiments of the present invention, including when said sealing means 100 are formed from two beads or alternatively male / female complementary means or any other equivalent means, as will be described below. This arrangement indeed makes it possible to guarantee that the means 100 ensure a watertight barrier between the two films 16 and 18

According to the embodiment illustrated in Figure 2, the sealing means 100 are in the form of two beads 104, 106 integral respectively of the two films 16 and 18 and placed facing each other to come into contact through their apices to form a tight barrier, when they are stressed by the sides 52, 54 of the cursor 50 According to FIG. 2, the two beads 104, 106 are symmetrical However as a variant, it is possible to provide beads 104, 106 asymmetrical

According to the embodiment illustrated in FIG. 3, the sealing means 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 to come to rest respectively on the sides of the male element 110 According to FIG. 3, the two lips 1120, 1122 are symmetrical However, as a variant, provision may be made for two asymmetrical lips 1120, 1122 Furthermore, the mixed element 110 is generally rounded. The sealing means 100 illustrated in FIG. 4 are identical to those of FIG. 3 However, it will be noted that according to FIG. 4, the cursor 50 has on the internal surface of its flanks 52, 54 of the bosses 520, 540 placed opposite the means 100 to guarantee the stressing of the latter in the sealing position, during the closing of the sachet The geometry of such bosses 520, 540 can be the subject of numerous variants. and other bosses facing the cursor 50 Another embodiment has been illustrated in FIG. 5 according to 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 element male 110 and the lips 1120 and 1122 is reinforced when the male and female elements 110 and 112 are brought into contact 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 situated towards the outside of the sachet Thus the internal pressure of the sachet, or even possibly directly the content of the latter, such as a liquid content, urges the first lip 1120 elastically against the male element 110 On the other hand, the second lip 1122 resists such a force and consequently does not deviate from the male element 110

As illustrated in FIGS. 1 to 6 and 10, the means 100 may have come from extrusion on the sheets 16, 18 making up the bag (more precisely on the internal surface of these sheets 16, 18 according to the embodiments 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 sachet, a bellows folded inwardly of the sachet 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 attached to the sheets 16, 18, at the mouth 12 of the bag, as illustrated in the figures 7 to 9 and 11 Here again, it will be noted that according to FIGS. 7 to 9, the support webs 121, 123 are fixed to the internal surface 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 inwards towards the inside of the bag to form an opening control veil, the support veils 121, 123 are fixed to the outer surface of the sheets 16, 18

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

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

The use of means 100 not extruded from the films 16, 18, but reported by welding or gluing is illustrated in the accompanying drawings only in Figures 7 to 9 and 11 However, the use of such means 100 reported on the films 16, 18 can be applied to all of the variant embodiments in accordance with the invention There is illustrated in FIG. 6 appended an alternative embodiment according to which there are provided on the one hand notches 160, 180 which open 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 slider 50, which ribs 522 and 542 are adapted to penetrate respectively into said 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 In fact it makes it possible to precisely locate the stress zone due to the cursor 50 It also makes it possible to retain in safely the cursor 50 on the bag This cooperation in fact prohibits any untimely withdrawal of the cursor 50 The use of ribs 522 and 542 and complementary notches

160, 180 is illustrated in the appended drawings only in FIG. 6 However, the use of such ribs 522 and 542 and complementary notches 160, 180 may be applied to all of the variant embodiments in accordance with l The invention The embodiment of FIG. 7 has been described previously. It is essentially distinguished from the embodiments illustrated in the previous figures by the fact that the means 100 are carried by respective support webs 121, 123 reported on the sheets 16 and 18, as indicated previously. The embodiment of FIG. 8 has been described previously. It differs essentially from the embodiments illustrated in the previous figures by the fact that the means 100 are carried by respective support webs 121, 123 combined with the support webs 21 and 23 of the profiles 20, 22 and attached to the sheets 16 and 18, as indicated above

It is the same for the embodiment illustrated in Figure 9 However, further according to Figure 9, the support webs 121, 21 and 123, 23 are connected together by a loop 24 This is arranged on the inside of the means 100 and has its concavity directed towards the outside of the bag

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

FIGS. 10 and 11 have illustrated alternative embodiments according to which such an anti-violation veil or opening indicator, referenced

19, is formed by a fold in the film making up the main sheets 16, 18 of the bag. According to FIG. 10, the profiles 20, 22 and the means 100 have come from molding on this film. However, according to FIG. 11, the profiles

20, 22 and the means 100 are carried by support webs 121, 21 and 123, 23 attached to 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 urging the bellows 19 inwards between the sheets 16, 18, as is well known. skilled in the art Those skilled in the art will readily understand that in a conventional manner, it is necessary to break the anti-violation veil 24 or 19 to access the product contained in the sachet 10

Thus, the state of the veil 24 or 19 makes it possible to indicate whether an intervention has taken place or not on the bag 10 In order to facilitate the opening of the veil 24 or 19, the latter can be provided, in a manner known per se , a line of weakness or precut, for example at mid-width, 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 a good seal of the bags. Furthermore, the cooperation defined between the notches 160, 180 and the ribs 522, 542 of the sliders 50 makes it possible to avoid any untimely withdrawal of the sliders 50 under the effect of the internal pressure in the sachets or even under the effect of a solicitation by a user Where appropriate, in the context of the embodiments illustrated in FIGS. 10 and 11 for which an anti-violation veil 19 is provided, 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 diagrammatically under the reference 60 in FIGS. 10 and 11

Of course, the present invention is not limited to the particular embodiments which have just been described, but extends to all variants in accordance with its spirit. The sachets in accordance with the present invention can be produced on any type of known machine and suitable, in particular on machines of the FFS (Form, Fill and Seal) type, that is to say machines designed to automatically carry out operations for forming, filling and closing sachets. Furthermore, the present invention also applies to implementations according to which the closure profiles are arranged longitudinally with reference to the direction of travel of the film than to implementations according to which the closure profiles are arranged transversely Furthermore, the present invention applies equally to layouts according to which, the closure profiles are pre-equipped with the slider when they are routed on the bag forming machine, only in implementations according to which the cursor is later placed on the sections. It will also be noted that the present invention is not limited to the geometry of the notches 160 180 and ribs 522, 542 illustrated on Figure 6 attached Indeed these notches 160, 180 and ribs 522, 542 can be the subject of many alternative embodiments as to their straight section Thus, for example, it is conceivable to give the notches 522, 542 a straight section with converging edges, for example in a dovetail or in the form of a rail (for example in a T or other). Such an arrangement reinforces the maintenance of the cursor 50 on the sachets As indicated above, preferably, in the context of the present invention, the sealing means 100 as well as the closure profiles 20, 22 extend over the entire width of the sachet. However, by definition, the slider 50 only extends over a limited area of this width Consequently, the slider 50 cannot alone solicit the sealing means 100 permanently over their entire length

As indicated above, to guarantee sealing, it is conceivable to give the means 100 a thickness L1 greater than that L2 of the 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 in order to ensure good sealing. This pressure P is shown diagrammatically in FIGS. 2 and 5 Nevertheless, these provisions can again 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 provide such stress P means 100 when the bag is closed

Different geometry of the closing profiles 20, 22 can be retained for this. In the case of complementary closing profiles of the male / female type as illustrated in FIG. 2, one can for example provide an asymmetrical female profile, in particular such that L3 is less than L4, that is to say that the height or overall dimensions L3 of the element 220 defining the internal lip of the female profile 22 is less than the height or overall dimensions L4 of the element 222 defining the external lip of the female profile 22

Those skilled in the art will understand that thanks to this arrangement, the internal element 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 male element 20 is engaged with the female element 22 and this over the entire length of the means 100

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

In the case of additional hook-type closure profiles as illustrated in FIG. 5, one can for example provide that the two complementary hooks C1, C2 located towards the inside of the bag define in the assembled position a width L5 between the internal faces of the sheets 16, 18 less than the width L6 taken between the same faces of the sheets 16, 18 at the level of the pair of complementary hooks C3, C4 situated towards the outside of the bag This arrangement makes it possible to ensure the same stress 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 secured respectively to the internal surface of the sheets 16, 18 are not positioned to come to bear by their apex, as indicated above opposite Figure 2, but are positioned to be juxtaposed and come to rest at their adjacent flanks opposite 103, 105 generally perpendicular icons on sheets 16 and 18

It will be noted that preferably according to the embodiments illustrated in FIGS. 12 and following, the cursor 50 is provided on the ends of its lateral wings 52, 54, with respective returns 53, 55 directed towards the inside of the bag. 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 sealing of the bag On the other hand these returns 53, 55 participate in maintaining the cursor 50 on the bags for prohibit an inadvertent withdrawal of the cursor As can be seen in FIG. 12, these returns 53, 55 urge the sheets 16, 18 towards each other, beyond the sealing means 100 It will also be noted that according to the embodiments illustrated in the figures 12 and following, preferably, the portions of support films 16, 18 situated 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 bag. This additional thickness of the supporting films 16, 18 to the right of the slider 50 makes it possible to maintain the means 100 in their sealing position when the bag is in closed position Such localized excess thickness of the films 16, 18 can be obtained in the form of an additional thickness formed when the film is extruded, or else it can result from the fixing of support webs of the closure profiles 20, 22 or means 100, such as previously indicated

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

According to the embodiment of FIG. 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 top of the 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

There is illustrated in FIG. 14 an alternative embodiment of FIG. 12 according to which at least one of the two juxtaposed elements 104, 106 is provided at its top with an orthogonal wing 1060 This is intended to come to rest against the face internal of the opposite sheet 16 to perfect the sealing. According to FIG. 14, such a wing 1060 is shown on only one of the elements 106. As a variant, it is however possible to provide such an 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 FIG. 12 according to which the two juxtaposed elements 104, 106 are provided at their top with a rounded protrusion 1042, 1062 This is intended to come to rest against the internal face of the sheet 16, 18 opposite to perfect the sealing. According to FIG. 15, there is provided such a protrusion on the two elements 104, 106 As a variant, such protuberance 1042, 1062 can be provided on a single element 104, 106 According to FIG. 15, these protuberances 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

FIG. 16 illustrates an alternative embodiment of FIG. 13 according to which the cursor 50 is further provided at the ends of each of the returns 53, 55 with an additional wing 530, 550 directed towards the base 56 of the cursor 50, ie towards the outside of the bag These wings 530, 550 are thus oriented generally parallel to the lateral wings 52, 54 of the cursor 50 These additional wings 530, 550 are designed to take position in the volume defined between the sheets 16, 18 and the sealing means 1040, 1060 100 On examining FIG. 16, it is understood that these wings 530, 550 ensure undulation on the sheets 16, 18 capable of further strengthening the tightness of the sachets obtained

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

On the other hand according to the variant illustrated in FIG. 17, the cursor has an asymmetry in the sense that only one 52 of the flanks is provided with such a return 53 directed towards the inside of the bag.

There is illustrated in FIG. 18 an alternative embodiment of FIG. 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 through their adjacent sides 103 105 For this, the boss 532 exerts on the element 104 a bias directed towards the base 56 Another FIG. 19 is illustrated in another embodiment according to which the portions of support films 16, 18 carrying the closure profiles 20, 22 and the sealing means 100 are not located in direct extension of the sheets making up the body of the bag, but are offset towards the outside of the bag at respective recesses 1600, 1800 These recesses 1600, 1800 can be obtained by extrusion during the production of the film or can be obtained subsequently by folding the film. It will be understood on examining FIG. 19 that such recesses 1600, 1800 make it possible to facilitate the juxtaposition of the sheets 16, 18 at the exit of the cursor 50, although the sheets 16, 18 are necessarily separated, inside the cursor due to the presence of the closure profiles 20 , 22 and means 100

It will also be noted on examining FIG. 19 that if necessary one of the recesses 1800 may 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 recess 1600 opposite so as to further strengthen the tightness of the sachets obtained

There is illustrated in FIG. 20 an alternative embodiment according to which there is provided on the one hand 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 Thus, as can be seen in FIG. 20, the boss 530 imposes a curvature or labyrinth path on the second sheet 16 at the outlet of the cursor 50, again suitable for reinforcing the tightness of the sachet obtained. FIG. variant of the figure

12 according to which at least one of the two elements 104 or 106 has an increasing thickness towards its apex or has an inclined side so that it exerts a force on the other element 106 or 104 juxtaposed, in the position of closing the bag FIGS. 22 et seq. have illustrated alternative embodiments according to which the sealing means 100 are formed essentially of flexible and elastic structures, so as to be defomnable when the bag is closed, while according to the representations given on Figures 12 to 21, the means 100 are essentially rigid There is thus illustrated in Figure 22 an alternative embodiment according to which the sealing means 100 comprise a curved, flexible and elastic lip 130 integral with the sheet 18 carrying the profile 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 FIG. 22, the lip 130 is formed of a cylinder sector whose angle at the center is greater than 180 °. According to FIG. 22, the concavity of the lip 130 is directed towards the inside of the bag. Alternatively, however, one could provide that the concavity of the lip 130 is directed towards the outside of the bag

As can be seen in FIG. 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, it is guaranteed that in the closed state of the bag, said lip 130 exerts pressure on the opposite sheet 16

There is illustrated in FIG. 24 an alternative embodiment of FIG. 22 according to which the location of the lip 130 and the geometry of this lip 130 are such that said lip 130, when it rests on the opposite sheet 16, receives a reaction which itself urges it to bear against one of the closure profiles, in this case the female closure profile 22

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

It will be noted that in FIG. 25 the central sole of the cursor 50 which controls the engagement, respectively the separation of the closure sections 20, 22 is referenced 57. FIG. 26 shows a side view of a bag thus equipped. in this FIG. 26, a cursor 50 having such biasing bosses 520, 540, as well as the closure 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 a part of the length of the slider 50 and moreover converge towards the upper base 56 of the slider 50 near the end of the slider 50 situated on the opening side of the bag. this arrangement, the bosses 520, 540 urge the lip 130 to bear against the closure profile 22, near the opening zone of the bag

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

Another variant embodiment has been illustrated in FIG. 27 according to which each of the two sheets 16, 18 is provided on its internal surface with an elastic lip 130 in the cylinder sector. These two lips 130 are thus supported by their top during closing the bag For this again, at rest, that is to say in the open position, at least one of the two lips 130 preferably extends beyond the associated closure profile, as has been shown schematically in Figure 28

The slider 50 used in the context of the variant embodiment of FIG. 27 can also include upward biasing bosses 520, 540, as illustrated in FIG. 26, to bias these elastic lips 130 against the closure profiles 20, 22, in the bag closed position

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

We will now describe the alternative embodiments illustrated in Figures 30 to 39 attached As previously indicated, according to these variants, the bag comprises on its mouth 12, means 150 situated opposite said additional sealing means 100, relative to the closure profiles 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, means 50 are provided on the slider capable of urging the walls of the bag inwards, in an area of these walls comprised between the additional means. sealing 100 and the support means 150 Thus, it is guaranteed that said additional means 100 are biased in a sealing position, by the slider 50 Preferably this biasing is made in line with the 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 closure profiles 20, 22, while the means 150 defining the support are located on the outside of the profiles. closing 20, 22

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

FIG. 30 illustrates a variant in which the additional sealing means 100 are formed by two flexible and elastic lips 170, 172, symmetrical and integral respectively with the internal face of the walls 16 and 18, and directed towards the inside. and the bottom of the sachet As a variant, these lips 170, 172 can be directed towards the inside of the cursor 50 (in particular for example for vacuum sachets). As indicated above, the arrangement of support means 150 applies to any type of sealing means 100 and is not limited to means 100 of FIG. 30 It can in particular be applied to lips 170, 172 which are not symmetrical Similarly according to FIG. 30, the closure profiles 20, 22 are of the male / female type. However, the invention can be applied to any other type of closure profiles, in particular hook profiles.

According to FIG. 30, the support means 150 are formed by two symmetrical elements 152, 154, respectively secured to the internal faces of the walls 16, 18, at the mouth of the bag. More precisely still according to FIG. 30, each of these elements 152, 154 have a rectangular cross section and extend in the direction of the median plane of the bag at which these elements are in mutual support, in the closed position of the bag. Thus these elements 152 and 154 extend generally perpendicularly to this. median plane

It will be noted that, according to FIG. 30, the means 100, the sections 20, 22 and the means 150 have come from material, if necessary from materials, preferably from extrusion, with the walls 16, 18 More precisely, again, it will be noted that the sections of these walls comprised between the sealing means 100 and the support means 150 are thicker than the sheets 16, 18 making up the remainder and most of the sachets. Thus the above-mentioned sections have a certain rigidity between the means. 100 and the means 150 Those skilled in the art will understand that by virtue of the aforementioned characteristics, when the elements 152, 154 are in abutment 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 biased themselves in their maximum sealing and contact position. In FIG. 31, the biasing means provided on the slider 50 are illustrated, in the form of e bosses 520, 540 provided on the inner surface of the wings 52, 54, in line with the closure profiles 20, 22 These are HERE bosses formed by cylindrical caps, but the invention is not limited to this particular geometry In FIG. 31, the force exerted by the cursor 50 on the mouth sections of the walls of the bag has been referenced F1, F2 the reaction due to the 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 cage of rectangular cross section 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 situated inwards towards the inside, with respect to them, of a value "d" It is thus defined on the walls 16 and 18 of the bag a step which serves to support the returns 53 and 55 provided on the wings 52 and 54 of the cursor 50, in order to avoid inadvertent withdrawal of the latter. FIG. 32 illustrates a variant according to which such an offset is eliminated. Thus according to FIG. 32 , on the contrary, the main walls of the bag 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 re turns 53, 55, on its wings 52, 54 thanks to the authorized deformation of the sheets 16, 18

According to the variant illustrated in Figure 33, the aforementioned sections, between the means 100 and 150, define at the mouth of the bag not a cage of rectangular cross section, but a generally rounded cage According to Figures 30 to 33 previously described, the support elements 152, 154 are symmetrical and contact each other in the median plane of the bag. Alternatively, however, these elements 152, 154 can be asymmetrical and thus contact each other outside the median plane. FIG. 34 thus illustrates , 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 FIGS. 30 to 34 previously described, the sealing means 100, the closure profiles 20, 22 and the support means 150 have come from material, if necessary from materials, preferably from extrusion, on the walls 16, 18 As a variant, these different means may have come on respective added support webs, for example thermally welded or glued to the internal faces of the sheets 16, 18 These may be respective and separate support sails for each of the means 100, profiles 20, 22 and means 150, or else support sails common to several of these means. variant according to which the means 100, the closure profiles 20, 22 and the support means 150 are carried by two respective webs, one attached to the internal face of the sheet 16, and the other attached to the face sheet 18 internal

An alternative embodiment has been illustrated in FIG. 36 according to which the biasing means are formed not of bosses integral with the internal 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, preferably in line with the closure profiles 20, 22 According to yet another variant, it is thus possible to provide bosses both on the slider and on the walls of the bag. Another variant of embodiment according to which the opposite ends of the elements 152 and 154 forming support means are widened, to guarantee support for the latter and to prevent these elements, by offset from finding themselves adjacent, in which case the lever arm expected to exert stress on the means 100 would not be obtained According to FIG. 37, the adjacent ends of the elements 152 and 154 have a generally triangular cross section, the l based is located in the contact plane However the invention is not limited to this particular arrangement

A variant has been illustrated in FIG. 38 according to which the cursor 50 is equipped on the internal face of its wings 52, 54 with projecting structures 522, 542 of complementary cross section of grooves 13 formed in the abovementioned 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 this arrangement, an untimely withdrawal of the cursor 50 is avoided

Another embodiment has been illustrated in FIG. 39 according to which means with complementary shapes are defined between the cursor 50 and the walls of the bag, at the returns 53, 55 shapes on the wings 52, 54, in the form of elements 530, 550 as described above

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

As indicated above, of course, the present invention is not limited to the particular embodiments which have just been described, but extends to all variants in accordance with its spirit.

By "sealing" is meant in the context of the present invention that the means 100 are adapted (according to their geometry and / or their bearing force) either to ensure a complete barrier preventing any penetration from the outside to the inside of the sachet and any leakage from the inside to the outside of the sachet, either to ensure at least one barrier in one direction, i.e. to prevent penetration from the outside to the inside of the sachet, or to prevent a leak from inside to 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 sachet and which participate in maintaining the cursor 50 on the sachet, are generally not alone in ensuring this maintenance, but for example complement in this function flared means provided on the central sole of the cursor 50

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

As indicated above, according to an alternative embodiment, the sole 59 is interrupted below (that is to say behind) the longitudinal end of the slider, at least on the widest side of the slider corresponding to the divergent side. corridors 590, 592, as can be 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 biasing the sheets 16, 18 of the bag in approach, covering the entire longitudinal extent of the sole 59 and extending longitudinally beyond and the other of this, to ensure the tightness 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 projecting inwardly of the slider 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 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), not at the height of the latter

These ribs 520, 540 continuously cover the sole 59 and extend beyond the latter, at least at the widest end of the sole 59 corresponding to the divergent side of the passages 590, 592 More precisely still, according to the preferred embodiment illustrated in the appended figures, the ribs 520, 540 extend over the entire length of the slider 50, while the sole 59 is interrupted, at its widest end (divergent side of the corridors 590 , 592), at a distance 11 from the end of the cursor 50, and at its finest end (converging side of the corridors 590, 592), at a distance 12 from the end of the cursor 50

The width 16 of the free space defined between the tops 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. Thus the cursor 50 solicits the sheets close together, in under the sole 59, and guarantees the tightness of the sachet

According to the embodiment illustrated in Figures 40 to 44 attached, there are provided two ribs 520, 540 symmetrical and of the same height, one on each of the wings 52, 54 Alternatively, one can provide asymmetrical ribs 520, 540 Thus, it is possible to provide only a single rib on one of the wings 52, 54 of the cursor 50. In the figures, the height of the sole 59 is referenced 13, considered parallel to the wings 52, 54 and perpendicular to base 56,

14 the distance separating the free end of the sole 59 opposite the base 56 and the ribs 520, 540, and 15 the width of the sole 59, at its widest end Within the framework of the present invention 11 is preferably between 1 mm and 10 mm, and is very preferably around 3 mm

12 is preferably between 0.5mm and 10mm, and is very preferably around 4mm

13 is preferably between 2mm and 7mm, and is very preferably around 3mm

14 is preferably between 5mm and 15mm, and is very preferably around 8mm

15 is preferably between 0.3mm and 2mm, and is very preferably around 0.5mm 16 is preferably between 50μm and 2.5mm, and is very preferably around 200μm

Furthermore, in the context of the present invention the ratio 11/15 is preferably between 0.5 and 30, and is very preferably around 6 the ratio 12/15 is preferably between 2.5 and 30 , and is very preferably around 8 the ratio 11/13 is preferably between 0.5 and 5, and is most preferably around 1 the ratio I2 / I3 is preferably between 0.1 and 5, and is very preferably of the order of 1, 3 the 11/14 ratio is preferably between 0.05 and 2, and is very preferably of the order of 0.4 . the 12/14 ratio is preferably between 0.05 and 2, and is very preferably around 0.5.

Claims

1. Bag comprising two generally parallel sheets (16, 18) forming the main walls of the bag, complementary closure profiles (20, 22) fixed respectively on these sheets and a slider (50) for actuating the profiles (20, 22) on closing and opening, characterized in that it further comprises, parallel to the closure profiles (20, 22), between said sheets (16, 18) and at the mouth (12) of the bag, additional raised means (100) arranged on the inside of the closure profiles (20, 22), designed to ensure sealing by forming a barrier between the sheets (16, 18), in the bag closed position, said additional relief means (100) being adapted to be biased towards their sealing position by the cursor (50) when the cursor is moved to the closed position of the bag

2. Bag according to claim 1, characterized in that the additional raised means ensuring the seal (100) are composed of at least one bead (102, 104 106) secured to the internal surface of a sheet (16 ) of the sachet

3. Bag according to one of claims 1 or 2, characterized in that the additional raised means ensuring the seal (100) are composed of two beads (104, 106) secured respectively to the internal surface of the two sheets ( 16, 18) of the sachet

4. Bag according to claim 1, characterized in that the additional raised means ensuring the seal (100) are composed of complementary male / female elements (110, 112) respectively secured to the internal surface of the two sheets (16 , 18) of the sachet

5. Bag according to claim 4, characterized in that the male element (110) has a substantially triangular section

6. Bag according to one of claims 4 or 5, characterized in that the two lips (1120 and 1122) of the female element (112) are asymmetrical

7. Bag according to one of claims 4 to 6, characterized in that the lip (1120) of the female element (112) located towards the inside of the bag relative to the male element (110) is more long and more flexible than the second lip (1122) located towards the outside of the bag

8. Bag according to one of claims 1 to 7, characterized in that the additional relief means ensuring the seal (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 profiles (20, 22), additional means (100) and of the slider (50) is such that the sides (52, 54) of the slider (50) impose on the means (100), a transverse clearance lower than that tolerated for the closure profiles (20, 22)

10. Bag according to one of claims 1 to 9, characterized in that the internal surfaces of the sides (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 profiles (20, 22) when these are engaged

11. Bag according to one of claims 1 to 10, characterized in that the cursor (50) has on the inner surface of its sides (52, 54) bosses (520, 540) placed opposite the means (100 ) to ensure that the latter are stressed in 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 opposite the means (100) and facing the sides of the slider (50) to guarantee the stress on the means ( 100) in the sealing position, when closing the bag

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 external surface of the bag, respectively opposite the means (100), and on the other hand ribs (522 and 542) projecting from the internal surface of the sides (52 and 54) of the slider (50), which ribs (522 and 542) are adapted to penetrate respectively into said notches (160 and 180 )

14. Bag according to one of claims 1 to 13, characterized in that it comprises means (19, 24) which form an anti-violation veil or opening indicator at the mouth (12).

15. Bag according to claim 14, characterized in that the anti-violation veil (24) is formed by a bellows folded towards the inside of the bag, at the mouth (12) in the continuity of support veils (121, 21 and 123, 23) closing profiles or additional sealing means.

16. Bag according to claim 14, characterized in that the anti-violation veil (19) is formed by a bellows folded towards the inside of the bag, at the mouth (12) in the continuity of the component film the bag

17. Bag according to one of claims 1 to 16, characterized in that the bag (10) is formed from a single film folded over 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 from a single film folded over 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 formed from two sheets (16, 18) initially separated and superimposed during manufacture

20. Bag according to one of claims 1 to 19, characterized in that the complementary closure profiles (20, 22) and / or the additional sealing means (100) have come from extrusion on the sheets (16 , 18) composing the sachet.

21. Bag according to one of claims 1 to 19, characterized in that the complementary closure profiles (20, 22) and / or the additional sealing means (100) are formed initially on respective support webs (21 , 23; 121, 123) reported on the sheets (16, 18), at the mouth (12) of the sachet

22. Bag according to one of claims 1 to 19 and 21, characterized in that the complementary closure profiles (20, 22) and the additional sealing means (100) are formed initially on common support webs (21, 23, 121, 123) 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 profiles (20, 22) are adapted to automatically provide a transverse stress (P) on the means (100) when the bag is closed

24. Bag according to one of claims 1 to 23, characterized in that the complementary closure profiles (20, 22) are of the male / female type and that they comprise at least one asymmetrical male or female profile.

25. Bag according to claim 24, characterized in that the height or bulk (L3) of the element (220) defining the internal lip of the female profile (22) is less than the height or bulk (L4) of the element (222) defining the external lip of the female profile (22)

26. Bag according to one of claims 1 to 23, characterized in that the complementary closure profiles (20, 22) are of the hook type and that they have at least two pairs of complementary hooks defining widths in the assembled position , different from one pair of hooks to another

27. Bag according to claim 26, characterized in that the two complementary hooks (C1, C2) located towards the inside of the bag define in the assembled position a width (L5) between the inner faces of the sheets (16, 18) lower at the width L6 taken between the same faces of the sheets (16, 18) at the level of the pair of complementary hooks (C3, C4) located towards the outside of the bag

28. Bag according to one of claims 1 to 27, characterized in that the additional raised means ensuring the seal (100) are composed of two elements (104, 106) respectively secured to the internal surface of the two sheets ( 16, 18) of the bag and intended to come to bear by their top

29. Bag according to one of claims 1 to 27, characterized in that the additional raised means ensuring the seal (100) are composed of two elements (104, 106) respectively secured to the internal surface of the two sheets (16, 18) of the sachet and intended to be juxtaposed and to come to bear at their adjacent flanks opposite (103, 105) generally perpendicular to the sheets (16 and 18)

30. Bag according to one of claims 1 to 27, characterized in that the cursor (50) is provided on the ends of at least one of its lateral wings (52, 54), with a return (53 , 55) directed towards the inside of the bag and positioned to be located beyond the sealing means (100)

31. Bag according to claim 30, characterized in that the cursor (50) is further provided at the end of this return (53, 55) with an additional wing (530, 550) directed towards the base (56) of the cursor (50), i.e. 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) located opposite the closure profiles (20, 22) and the sealing means (100), have a thickness greater than the thickness of the rest of the film making up the sachet

33. Bag according to claim 32, characterized in that the localized excess thickness of the films (16, 18) is obtained in the form of an additional thickness formed when the film is extruded.

34. Bag according to claim 32, characterized in that the localized excess thickness of the films (16, 18) results from the fixing of support webs of the closure profiles (20, 22) or of the means (100)

35. Bag according to one of claims 3 and 28, characterized in that the two elements (104, 106) secured respectively to the internal surface of the sheets (16, 18) are provided at their top with at least one wing respective (1040, 1060) orthogonal audits 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 provided at its top with a wing (1060) orthogonal intended to come to rest against the internal face of the sheet (16) opposite

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 sheets supports, has a rounded protuberance at its top (1042, 1062)

38. Bag according to claim 31, characterized in that the cursor (50) is also provided at the end of this return (53, 55) with a boss (532) directed towards the base (56 ) to urge the two juxtaposed elements (104, 106) to bear by means of their adjacent sides (103, 105)

39. Bag according to one of claims 1 to 38, characterized in that the portions of support films (16, 18) carrying the closure profiles (20, 22) and the sealing means (100) are not located in direct extension of the sheets making up the body of the sachet, but are offset towards the outside of the sachet at the level of respective recesses (1600, 1800)

40. Bag according to claim 39, characterized in that one of the recesses (1800) is itself provided with an extension (1802) directed towards the opposite support sheet (16)

41. Bag according to one of claims 3 and 29, characterized in that at least one of the two elements (104 or 106) has an increasing thickness in the direction of its top or has an inclined side so that it exerts a force on the other element (106 or 104) juxtaposed, in the closed position of the bag

42. Bag according to one of claims 1 to 41, characterized in that the sealing means (100) comprise flexible and elastic structures, to be deformable 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 elastic lip (130) integral with the sheet (18) carrying one closure profiles (22)

44. Bag according to claim 43, characterized in that the lip (130) is formed by a cylinder sector whose angle at the center is greater than 180 °

45. Bag according to one of claims 43 or 44, characterized in that in the open state of the bag, said lip (130) extends beyond the associated closure profile (22) so that in the closed state of the bag, said lip (130) exerts pressure on the opposite sheet (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 said lip (130), when it rests on the opposite sheet (16), receives a reaction which urges it itself to bear against one of the closure profiles

47. Bag according to claim 46, characterized in that the biasing of the lip (130) bearing against the female closing element (22) is reinforced by the presence on the internal surface of the sides (52, 54) of the boss slider (50) (520, 540)

48. Bag according to claim 47, characterized in that the bosses (520, 540) converge towards the upper base (56) of the cursor (50) in approach to the end of the cursor (50) situated on the opening side of the bag .

49. Bag according to one of claims 1 to 48, characterized in that each of the two sheets (16, 18) is provided on its internal surface with an elastic lip (130) in the sector of a cylinder designed to come to bear by their top 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 provided on its internal surface with an elastic lip (130) in the sector of a cylinder designed to be juxtaposed laterally

51. Bag according to one of claims 1 to 50, characterized in that it comprises on its mouth (12), means (150) located opposite said additional sealing means (100), relative to the closing profiles (20, 22), and adapted to define a support between the opposite internal faces of the walls of the bag, and there are provided on the slider (50) means (520, 540) capable of urging the walls of the bag , inwards, in an area of these walls comprised between the additional sealing means (100) and the support means (150)

52. Bag according to claim 51, characterized in that the stress is applied to the level of the closure profiles (20, 22)

53. Bag according to one of claims 51 or 52, characterized in that the additional sealing means (100) are located on the inside of the closure profiles (20, 22), while the means (150) defining the support are located on the outside of the closure profiles (20 22)

54. Bag according to one of claims 51 to 53, characterized in that the additional sealing means (100) are formed by two flexible and elastic lips (170, 172)

55. Bag according to one of claims 51 to 54, characterized in that the support means (150) are formed of two elements (152, 154), respectively secured to the internal faces of the walls (16, 18), at the mouth of the bag

56. Bag according to claim 55, characterized in that these elements (152, 154) are in mutual support, in the closed position of the bag, in the median plane thereof

57. Bag according to claim 55, characterized in that these elements (152, 154) are in mutual support, in the closed position of the bag, outside of the median plane thereof.

58. Bag according to one of claims 51 to 57, characterized in that the support means (150) have come from material, where appropriate from materials, preferably from extrusion, with the walls (16, 18) from the sachet

59. Bag according to one of claims 51 to 57, characterized in that the support means (150) have come from material, where appropriate from materials, preferably from extrusion, on attached support webs, for example by welding or gluing, on the walls (16, 18) of the bag

60. Bag according to one of claims 51 to 59, characterized in that the sections of the walls included between the sealing means (100) and the support means (150) are thicker than the sheets (16, 18) composing the rest and most of the sachets

61. Bag according to one of claims 51 to 60, characterized in that the biasing means comprise bosses (520, 540) on the internal surface of the wings (52, 54) of the cursor (50)

62. Bag according to one of claims 51 to 61, characterized in that the biasing means comprise bosses on the walls of the bag

63. Bag according to one of claims 61 or 62, characterized in that the bosses (520, 540) are provided in line with the closure profiles (20, 22)

64. Bag according to one of claims 51 to 63, characterized in that the opposite ends of the elements (152, 154) forming support means are widened, for example of generally triangular cross section

65. Bag according to one of claims 1 to 64, characterized in that the elements making up the sealing means (100) are coextruded with the bag and / or the closure profiles, made of a more flexible material than the material forming the latter, for example into a copolymer of ethylene or a synthetic elastomer

66. Bag according to one of claims 1 to 65, characterized in that said additional relief means are placed opposite the sides of the slider

67. Film for producing a sachet according to one of claims 1 to 66, characterized in that it comprises complementary closure profiles (20, 22) actuable by a slider (50) and additional means in relief (100) arranged on the inside of the closure profiles (20, 22), designed to ensure a seal by forming a barrier between the sheets (16, 18) intended to form the sachet, in the closed position of the sachet

68. Film according to claim 67, characterized in that the additional raised means ensuring the seal (100) are composed of at least one bead (102, 104, 106)

69. Film according to one of claims 67 or 68, characterized in that the additional raised means ensuring the seal (100) are composed of two beads (104 106)

70. Film according to claim 67, characterized in that the additional raised means ensuring the seal (100) are composed of complementary male / female elements (110, 112)

71. Film according to claim 70, characterized in that the male element (110) has a substantially triangular section

72. Film according to one of claims 70 or 71, characterized in that the two lips (1120 and 1122) of the female element (112) are asymmetrical

73. Film according to claim 67, characterized in that the additional raised means ensuring the seal (100) are composed of elements (104, 106) intended to be juxtaposed and to come into abutment at their adjacent sides in look (103, 105) generally perpendicular to the sheets (16 and 18)

74. Film according to claim 67, characterized in that the additional raised means ensuring the seal (100) comprise at least one curved, flexible and elastic lip (130)

75. Film according to one of claims 67 to 74, characterized in that it comprises means (150) situated opposite said additional sealing means (100), relative to the closure profiles (20, 22), and adapted to define a support between the opposite internal faces of the walls of the bag

76. Extruded strip for producing a bag according to one of claims 1 to 66, characterized in that it comprises raised means (100) arranged on the inside of the closure profiles (20, 22 ), designed to ensure a seal by forming a barrier between the sheets (16, 18) intended to form the sachet, in the closed position of the sachet

77. Strip according to claim 76, characterized in that it further comprises at least one closure profile (20, 22) actuable by a slider (50) on a support web common to said means in relief (100)

78. Strip according to one of claims 76 or 77, characterized in that the raised means ensuring the seal (100) are composed of at least one bead (102, 104, 106)

79. Strip according to one of claims 76 to 78, characterized in that the raised means ensuring the seal (100) are composed of two beads (104, 106)

80. Strip according to one of claims 76 or 77, characterized in that the raised means ensuring the seal (100) are composed of male / female elements (110, 112)

81. Strip according to claim 80, characterized in that the male element (110) has a substantially triangular section

82. Strip according to one of claims 80 or 81, characterized in that the two lips (1120 and 1122) of the female element (112) are asymmetrical

83. Strip according to one of claims 76 to 82, characterized in that the additional raised means ensuring the seal (100) are composed of elements (104, 106) intended to be juxtaposed and to come to bear at the level of their adjacent facing flanks (103, 105) generally perpendicular to the sheets (16 and 18)

84. Strip according to one of claims 76 to 83, characterized in that the additional raised means ensuring the seal (100) comprise at least one curved, flexible and elastic lip (130)

85. Strip according to one of claims 76 to 84, characterized in that it comprises means (150) situated opposite said additional sealing means (100), relative to closure profiles (20 , 22), and adapted to define a support between the opposite internal faces of the walls of the bag

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 profiles (20, 22) respectively fixed on these sheets (16 18) of the mouth of the bag and a slider (50) comprising two lateral wings (52, 54) connected to each other at a base (56), placed on the outside of the sheets (16, 18) at the mouth of the bag and which define with an elongated central sole (59), two corridors (590, 592) of converging passage for the complementary closure profiles (20, 22), characterized by the fact that the sole (59) is interrupted back from the longitudinal end of the slider (50), at least on the widest side of the slider corresponding to the divergent side of the passageways (590, 592), and that the wings lateral (52, 54) are provided in the vicinity of their free edge opposite the base (56), means (520, 540, 100) for biasing the sheets (16, 18) of the bag in close proximity, covering the entire longitudinal extent of the sole (59) and extending beyond it longitudinally on either side thereof, to ensure the tightness of the bag in the closed position thereof

87. Bag according to claim 86, characterized in that the biasing means are composed of ribs (520, 540) projecting towards the inside of the cursor (50), at the edge of the opposite wings (52, 54). at the base (56), or over part of the height of the internal surface of these wings (52, 54) between the free edge of the wings (52, 54) and the base (56)

88. Bag according to claim 87, characterized in that the ribs (520, 540) are located below the sole (59), and not at the height of the latter.

89. Bag according to one of claims 87 or 88, characterized in that the ribs (520, 540) extend over the entire length of the slider (50), while the sole (59) is interrupted, at the level from its widest end, at a distance (11) from the end of the cursor (50)

90. Bag according to one of claims 86 to 89, characterized in that the sole (59) is also interrupted at its thinnest end (converging side of the corridors (590, 592), at a distance (12 ) from the end of the cursor (50)

91. Bag according to one of claims 87 to 90, characterized in that the width (16) of the free space defined between the tops 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

92. Bag according to one of claims 87 to 91, characterized in that the cursor comprises two symmetrical ribs (520, 540) and of the same height, one on each of the wings (52, 54)

93. Bag according to one of claims 87 to 91, characterized in that the cursor (50) comprises asymmetrical ribs (520, 540), or a single rib on one of the wings (52, 54) of the cursor (50)

94. Bag according to one of claims 86 to 93, characterized in that the distance (11) separating the wide end of the sole (59) and the end of the slider is between 1 mm and 10mm, and preferably around 3mm

95. Bag according to one of claims 86 to 94, characterized in that the distance (12) separating the fine end of the sole (59) and the end of the slider is between 0.5mm and 10mm, and is very preferably around 4mm

96. Bag according to one of claims 86 to 95, characterized in that the height (13) of the sole (59) is between 2mm and 7mm, and is preferably around 3mm

97. Bag according to one of claims 86 to 96, characterized in that the distance (14) separating the top of the sole (59) and the biasing means (520, 540) is between 5mm and 15mm, and is very preferably around 8mm

98. Bag according to one of claims 86 to 97, characterized in that the thickness (15) of the sole (59) at its wide end is between 0.3mm and 2mm, and is preferably of the order 0.5mm

99. Bag according to one of claims 86 to 98, characterized in that the width (16) of the opening formed between the biasing means (520, 540) is between 50 μm and 2.5 mm, and is very preferably around 200μm

100. Bag according to one of claims 86 to 99, characterized in that the ratio (11/15) between the distance (11) separating the wide end of the sole (59) and the end of the slider and l '' thickness (15) of the sole (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 (12) separating the fine end of the sole (59) and the end of the slider and l thickness (15) of the sole (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 (11/13) between the distance (11) separating the wide end of the sole (59) and the end of the slider and the height (13) of the sole (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 (12) separating the fine end of the sole (59) and the end of the slider and the height (13) of the sole (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 (11/14) between the distance (11) separating the wide end of the sole (59) and the end of the slider and the distance (14) separating the top of the sole (59) and the biasing means (520, 540) is preferably between 0.05 and 2, and is very preferably around 0.4.

105. Bag according to one of claims 86 to 104, characterized in that the ratio (I2 / I4) between the distance (12) separating the fine end of the sole (59) and the end of the slider and the distance (14) separating the top of the sole (59) and the biasing means (520, 540) is preferably between 0.05 and 2, and is very preferably around 0.5.