ITBO20070387A1 - BAG FOR THE CONTAINMENT OF A PRODUCT AND PROCEDURE FOR THE REALIZATION OF SUCH A BAG. - Google Patents

Abstract

A bag (10) for containing a product (P), especially a food product that is preferably in the form of a granular product or a product in pieces, is made of a flexible material, preferably a plastic film, and comprises a front wall (12), a rear wall (14) and opposite side walls (16, 18), at least one of which is provided with a respective gusset defined by facing longitudinal flaps (19, 21 and 23, 25). The bag comprises a joining portion (33) between the front wall (12) and the rear wall (14) of the bag, said joining portion being provided on the extension of the respective flaps (23, 25) of the gusset (18) where means for gripping the bag are made.

Description

DESCRIPTION

attached to a patent application for INDUSTRIAL INVENTION entitled:

BAG FOR CONTAINING A PRODUCT AND PROCEDURE FOR MAKING THIS BAG.

The present invention refers to a bag for containing a product.

The bag is, preferably, but not exclusively, suitable for containing a food product, also for feeding animals, which is preferably in the form of a granular product or in pieces.

Furthermore, the bag is preferably obtained starting from plastic film, in particular from a flexible plastic layered film.

In the field, pouches in laminated plastic material are known for containing products, in particular food products, which comprise a front face, a rear face and corresponding side surfaces, which are in the form of corresponding "V-shaped" bellows portions. ".

Among these bags, of the known type, some have an upper tubular mouth, which has no gusseted areas and which is closed by means of suitable closing means, which can be opened and closed, in particular defined by a corresponding zip, which extends for the the entire width of the bag to also define means for sealing the upper end of the same bellows of the bag.

In bags according to the known art, the product comes out of the bag not in an optimal way and the grip that said bag allows to the user is not optimal either.

The result is a difficulty in pouring the contained product in correspondence with a desired area and a substantial inconvenience in carrying out said operation, and in handling - in general - the bag.

According to an advantageous aspect, a bag is provided for containing a product, in particular in the form of a food product, preferably in the form of a granular product or in pieces; said bag having a body of the bag, preferably made of flexible material, such as plastic film, and comprising a front wall, a rear wall, and a respective bellows defined by opposing flaps; characterized in that it presents a joining portion between the front wall and the rear wall of the bag, which joining portion is provided on the extension of the flaps of the corresponding bellows.

In this way, a large portion is defined on the extension of the bellows which can advantageously be taken to provide for a convenient handling of the bag and, in particular, to obtain an easy and effective release of the product from the bag.

The present invention is also directed to a method for manufacturing an advantageous bag.

Other advantageous aspects of the present bag and method are illustrated in the other claims.

These and further characteristics of the invention can be clearly seen from the content of the claims reported below, and the advantages thereof will be more evident in the detailed description that follows, made with reference to the attached figures, which represent purely exemplary and non-limiting embodiments. , in which:

Figure 1 illustrates a perspective view of a preferred embodiment of the bag according to the present invention, in a closed bag condition;

Figure 2A illustrates a side view of the first preferred embodiment of the bag in an empty and flattened condition;

Figure 2B illustrates a sectional view of the first embodiment of the bag in an empty and flattened condition, taken along the line IIB-IIB of Figure 2A;

Figure 2C illustrates a sectional view of the first embodiment of the bag in an empty and flattened condition, taken along the line IIC-IIC of Figure 2A;

Figure 3 shows a perspective view of the first preferred embodiment of the bag, in the open bag condition;

Figure 4 illustrates a perspective view of the first preferred embodiment of the bag, in a condition where the contained product is released; Figure 5 illustrates a top plan view of the film used in a first process for making the bag according to the first preferred embodiment;

Figure 6 illustrates a schematic perspective view relating to a second preferred embodiment of bag;

Figure 7 illustrates the second preferred embodiment of pouch in a spaced-apart gusset condition;

Figure 8 illustrates a side view of a third preferred embodiment of the bag, in the condition of an empty bag;

Figures 9 and 10 illustrate respective perspective views of a second method for manufacturing the bag according to the first preferred embodiment;

Figure 11 illustrates a perspective view of a third method for making the bag according to the first preferred embodiment;

Figure 12 illustrates a perspective view of a fourth method for making the bag according to the first preferred embodiment;

Figure 13 illustrates a perspective view of a fourth preferred embodiment of bag;

Figure 14 illustrates a perspective view of a fifth preferred embodiment of bag.

Figures 1 to 4 illustrate a preferred embodiment 10 of a bag according to the present invention.

This bag is preferably suitable for containing a food product, also for feeding animals, which is preferably in the form of a granular product or in pieces.

Said bag could, however, be suitable for containing any other material, such as a powder material or a liquid, for example in the form of a detergent or the like.

As will become clearer, however, from the rest of the present description, the present bag is preferably obtained by the appropriate folding of a film, in particular of a film of layered plastic material, which has an appropriate flexibility.

In particular, to obtain a bag according to the embodiment of figure 1, it is envisaged to use a film made of plastic material, or plasticized, with said film having a sealable face, in particular thermally sealable, and a non-sealable opposite face, on the which are provided, in predetermined and appropriate areas, with writings, colors and representations, intended for the corresponding part of the finished bag, i.e. they are intended for the front face of the bag, the rear face of the same bag and the side walls of the same .

As can be seen from the figures, the bag 10 comprises a front wall 12, a rear wall 14 and opposite lateral sides 16, 18, which are shaped so as to define respective bellows, having a cross section in the shape of a "V" and composed of respective layers or portions of film.

As illustrated, said bellows, or lateral sides, 16 and 18 consist of respective longitudinal portions, or flaps 19, 21, and 23, 25, which extend from respective edges 12a, 14a and 12b, 14b of said front walls and rear 12 and 14.

The numerical references 16a and 18a therefore indicate the longitudinal edges of bending or separation between the said flaps, or panels, of the bellows 19, 21 and 23, 25, which extend in normal condition retracted, towards the inside of the bag.

At the bottom, the bag 10 has a bottom, which is defined by a transverse strip 44 obtained through the union, or welding, of opposite transverse lower flaps 12c, 14c of the front and rear walls 12, 14.

As illustrated in Figure 1, in the filled condition, the lower parts or areas of said front and rear walls 12, 14 contribute to define the bottom of the present bag. However, as illustrated in Figure 1, it would also be conceivable. to make and fold said lower part of the bag 12c, 14c in such a way that this folded portion overlaps the front wall 12, defining an enlarged or flat bottom for the said bag, in which the lower part of the wall 14 constitutes the lower transverse face of the bag in a filled condition. In this condition, the lower part of the bag, which is folded onto the rear wall 12, rests and is suitably glued to the corresponding portion of the aforementioned rear wall, in a manner which is known to the skilled in the art and therefore does not require further information. . Obviously, it would also be conceivable to fold and fix the bottom portion on the rear wall 14.

At the top, the present bag has a mouth 30 for the passage of the product, which will in any case be better described below, in correspondence with which means for closing said mouth 30 can be provided, which can be opened and resealable, for example being underneath form of a zip, having respective elements for mutual connection, which are engageable and disengageable with each other, in particular disengageable by means of a traction provided away from the corresponding portions of said front and rear walls 12, 14 of bag, and engageable with each other as a result of an action of approaching the same portions of the front and rear walls 12, 14.

As shown, corresponding longitudinal welds, or joints, are provided, marked with the reference numerals 31s, 33s, 35s, 37s, at the edges 12a, 12b, 14a, 14b for the connection, respectively, of the front walls 12 and rear 14 with the portions, or flaps, 19, 21, 23, 25 defining the lateral bellows of the bag.

As illustrated, the bag 10 comprises side gussets 16, 18, which have a respective upper end 16 ', 18', of which only the upper end 18 'of the gusset 18, as can be seen in figure 2A, is closed by a band or strip 40, which is adapted to seal said end of the bellows and is adapted to prevent communication from occurring between the outside and the inside of the bag. Preferably, said band 40 therefore defines hermetic sealing means for the bag.

The band 40 is suitably attached, or welded, above the upper end 18 'of the bellows 18, which is in contact with a corresponding wall, in particular as provided in this preferred embodiment, on the inner face of the wall 14 of the bag. . The said band 40 is also fixed, or welded, to the corresponding wall 14 of the bag.

Advantageously, the present bag 10 is provided with a joining portion 33 between the front wall 12 and the rear wall 14 of the bag, which joining portion 33 is provided on the extension of the respective flaps 23, 25 with the corresponding bellows 16 .

Advantageously, said joining portion 33 is adapted to define gripping means for the bag, which are provided on the extension of the respective bellows 18 and, as can be seen, in particular from Figure 4, said joining portion 33 has such an amplitude to allow the engagement of at least one finger, and in particular of a plurality of fingers of the user's hand M.

In this way, it is possible to define a portion 33 for gripping the bag, which allows easy handling, in particular it allows the product P to be easily poured outside the product, as is clearly shown in figure 4.

As illustrated, said joining portion 33 extends longitudinally to the bag between the end 18 'of the bellows 18 and the upper edge 41 for the top closing of the bag.

As illustrated, said gripping portion 33 is delimited by respective longitudinal, internal and external edges 33a, respectively, 33b, and by respective transverse edges 33c, 33d.

Furthermore, as illustrated, said joining portion 33 extends transversely for at least part of the width of the corresponding bellows, in particular until it corresponds to, or on the longitudinal extension, the inner edge 18a of the respective bellows 18.

However, it would also be conceivable that said gripping portion could be wider than the transversal width of the respective bellows, or that it has a respective inner edge 33a, which extends transversely beyond the inner edge 18a of the corresponding bellows 18.

In this way, a gripping portion 33 of considerable width and easy engagement by the user's fingers is obtained.

To facilitate gripping of said portion 33, at least one hole 35 is provided in this portion 33, which is delimited by a corresponding edge 35 ', which hole 35 is advantageously in the form of an oblong hole, which extends longitudinally to the bag, ie parallel to the lateral sides 16 and 18 of the present bag.

In this way, it is possible to comfortably insert the hand M, as illustrated in figure 4, inside the hole 35 and perform an advantageous operation for releasing the product P from the bag 10.

The present bag also advantageously has, as illustrated, a first and a second bellows 16 and 18, of which one of these, in particular as illustrated the bellows 16, extends beyond the upper longitudinal end 18 'of the other bellows. 18.

As reported, in this embodiment, the bag gripping means 33 are provided on the extension of the short bellows 18.

Particularly advantageously, the bellows 16 is in turn suitable for defining means for conveying the product P out of the bag 10, as can be clearly seen from the aforementioned figure 4.

In practice, the presence of a longer bellows 16 is exploited to obtain advantageous means for conveying the product P out of the bag 10.

As illustrated, said bellows 16 has a respective upper end 16 'which extends at the upper limit 41 of the bag 10.

Furthermore, the presence of an advantageous mouth 30 for the product P outlet is provided, which opens at the flaps 19, 21 of the aforementioned bellows 16.

As illustrated, said mouth 30 is, in particular, provided at the end 16 'of the bellows 16.

Advantageously, the bellows 16 has a respective terminal portion, or section 161, in correspondence with said outlet mouth 30, which can be moved between a closure configuration, illustrated in Figure 3, and a configuration for the product to come out through said mouth. 30, as shown in figure 4.

In particular, the bellows 16 has a longitudinal end 16 'such that, with the bellows 16 in a retracted condition towards the inside of the bag, it defines means for closing, at least partially, the mouth 30 for the outflow of the product.

In practice, the release of the product occurs when the respective flaps 19, 21 of the bellows 16 are in an extended condition towards the outside of the bag, as shown in Figure 4.

In particular, the material constituting the bag has characteristics such that the bellows 16 opens or extends towards the outside of the bag, due to the weight of the product P contained within the bag itself and, moreover, such that said bellows reseals elastically, towards the inside of the bag, when said product P no longer weighs on the same bellows 16.

As illustrated, said mouth 30 for the outlet of the product P opens at the end 16 'of the respective bellows 16, or on the opposite transverse side to that in which said bag gripping means 33 are provided, and is substantially aligned, in a transverse direction, to said gripping means 33.

As illustrated, the outflow mouth 30 is defined by a corresponding oblique edge, marked as a whole with the reference numeral 30 '.

In this way, it is possible to define an outlet 30 for the product which opens in the longitudinal direction of the bag. In any case, it would also be conceivable to provide an outlet for the product which opens, at the same time, both in a transverse or lateral direction to the bag, and in a longitudinal direction to the same bag.

As shown in particular in Figure 4, said outlet mouth 30 is defined by opposite edges 19 ', 21' of the flaps 19, 21 of the corresponding bellows 16 and by corresponding edges 126 ', 146' of the front rear wall 12, 14 of the bag, which substantially coincide or match the said edges 19 ', 21' of the bag flaps, in the closed bag condition, illustrated in figure 3, and are, on the other hand, inclined in the opposite way to said edges 19 ', 21 'at the end 16' of the bellows 16, when said extreme portion 161 of the bellows 16 extends transversely beyond the edge 12a, 14a of the front and rear walls 12, 14.

In particular, as illustrated, said edges 19 ', 21' on the respective flaps 19, 21 of the bellows 16 extend obliquely, like the edges 126 ', 146', provided on the portion of the respective front walls 12 and 14, which are facing to the corresponding flaps 19, 21 of the bellows 16.

In particular, said mouth 30 extends transversely, substantially, for the entire width of the corresponding bellows 16.

However, it would also be conceivable that said mouth 30 for the product outflow extends for a short transverse length, remaining substantially within the transversal width of the corresponding bellows 16.

As previously mentioned, the present bag comprises an upper transverse edge 41 for closing the bag, which is defined by opposite end strips, joined together, in particular welded, of the front and rear walls 12, 14 of the bag and of the flaps. 19, 21 of the same bellows 16.

As illustrated, said mouth 30 opens in correspondence with said upper transverse edge 41. In particular, the product outlet mouth 30 opens at a lateral zone of said upper transverse closing edge 41.

As reported, the present bag also has longitudinal closing edges marked with the numerical references 31s, 33s, respectively provided between the front wall 12 and the opposite flap 19 of the bag between the rear wall 14 and the opposite flap 21 of the bellows 16 and, on the opposite side of the longitudinal closing edges 35s, 37s which are provided between the front wall 12 and the opposite flap 23 of the bellows 18 and between the rear wall 14 and the opposite flap 25 of said bellows 18. Said longitudinal edges 31s, 33s, 35s, 37s are provided with corresponding joined portions of said front and rear walls 12, 14 and corresponding flaps 19, 21, 23, 25 defining respective bellows 16 and 18, which are joined by longitudinal welds.

As illustrated, said product outlet 30 opens in corresponding longitudinal edges 31s, 33s in particular in correspondence with an extreme upper zone of said longitudinal edges 31s, 33s, which join the front and rear walls 12, 14 to the flaps bellows 16.

Advantageously, as can be seen in particular from Figure 3, the longitudinal end 16'a of the edge 16a joining the flaps 19, 21 of the bellows 16 extends in correspondence with the transverse closing edge 41.

As can be seen from figures 1 and 2A, the present bag is provided, in the closed condition, with a pre-weakened removal line 31 for a corner portion 10 'of the bag, in which said pre-weakened line 31 coincides, a once said portion 10 'has been removed, with the edge delimiting the mouth 30 for the outlet of said product.

Obviously, said pre-weakened line 31 extends obliquely and is obtained, as can be seen better with reference to the following figure 5, from respective portions 319, 321, which extend in correspondence with the areas of the film which are intended to define the flaps 19, 21 of the bellows, and which are oriented, starting from a common junction point, according to angular directions opposite to each other, and of the further oblique sections 314, 312, which extend over the part of the film that is intended to create the front and rear walls 12, 14 of the bag, which extend from respective ends of said oblique portions 319, 321 with an inclination opposite to these.

Said pre-weakened line 31 is advantageously in the form of a thinning of the thickness of the film, made of plastic material and is, in particular, obtained by laser engraving.

As illustrated, in correspondence with said pre-weakened line 31 there are provided advantageous means for initiating breakage, in particular constituted by corresponding notches 31a, 31 b, at the ends of said pre-weakened line 30, which notches 31 a, 31 b open at said longitudinal closing edges 31s, 33s and at the transverse closing edge 41, as well illustrated in Figure 2A.

There are also advantageously provided means 40 for sealing the corresponding end 18 'of the bellows 18, which are advantageously, as reported, in the form of a short sealing band 40, which extends only at said end. 18 'of the short bellows 18.

As illustrated, said portion 33, defining said bag gripping means, extends in correspondence with said sealing means 40 of the end 18 'of the bellows 18.

Marked with the numerical references 53 and 63, they are also provided with further bag gripping means, which are on the longitudinal side opposite to that of the product outlet, and, in particular, on the longitudinal side of the bag, which is opposite to the of the first gripping means 33, in particular at the bottom of the aforementioned bag 10.

In particular, said bag gripping means 53, 63 are provided on the extension of a corresponding bellows 16, 18, at the respective lower ends 16 ", 18" of the corresponding bellows.

In particular, as illustrated, first means 53 are provided on the side, or side 18, of the bag and second gripping means 63, at the other side 16 of the bag.

In practice, the first gripping means 53, at the bottom, which are provided on the side, or side 18, of the bag, are longitudinally aligned with the first gripping means 33, while the second gripping means 63, at the bottom, which are provided on the side, or side 16, are longitudinally aligned with the outlet mouth 30.

Corresponding holes 55, 65 are provided in said gripping means 53 and 63, at the bottom of the bag, which are delimited by corresponding edges 55 ', 65', for the insertion of at least one corresponding finger of the user.

As illustrated, the said gripping portions on the lower side of the bag 53, 63 are made by corresponding welds of the flaps 19, 21 and 23, 25 of the corresponding bellows to the corresponding front walls 12, 14.

In practice, first and second portions are provided which respectively define said grip portions 53 and 63, which can also be suitably joined together.

In accordance with Figure 5, it can be seen that an advantageous method for obtaining the first preferred embodiment of bag 10, according to the present invention, provides for feeding a flat film 51, which is suitable for making said bag 10, and for providing, in said film 51, in correspondence with an area 58 which is intended to form the bellows 18 of the bag, an opening 57 and, in correspondence with a position of the same film, which is transversely aligned with this opening 57, or in correspondence with a portion 56 of the film, which is intended to form the bellows 16 of the bag 10, to form an incision line, in particular obtained by means of a laser.

Said laser engraving comprises, as already illustrated, a first part 319, a second part 321, which define between them a substantially "V" conformation, as well as a third part 312 on the extension of said portion 319 and thereby forming a portion in the general shape of "V", and a fourth part 314, on the extension of said portion 321, and defining with this a portion in the shape of "V", which portions are suitable for defining said pre-incision defining the outlet of the 30 product in the finished bag.

According to a second preferred embodiment 100, illustrated in Figures 6 and 7, in order to realize the said gripping portion of the bag 133, at the upper longitudinal end of the bag, it is provided to seal the corresponding ends of a bellows 16.

In practice, a first portion 133a is provided, which is provided between the flap 23 of the bellows 18 and the front wall 12 and a second portion 133b, which is provided between the flap 25 of the bellows 18 and the rear wall 14, which are suitably perforated, defining corresponding insertion and gripping openings 135a and 135b.

It can also be advantageously provided to join, in particular weld, said perforated gripping portions 133a, 133b, to define a unitary gripping portion 133, as illustrated in figure 6, thanks to the provision of corresponding openings not particularly illustrated in the figures. attached, in said flaps 23, 25, of the bellows 18, which allow the internal and weldable faces of the front and rear walls 12 and 14 to come into direct contact with each other. It is thus possible to obtain the adhesion of the wall 12 to the wall 14 and the definition of a unitary grip portion 133.

in practice, in this second preferred embodiment 100, the bellows 16 and 18 have the same length and preferably extend up to the upper edge of the bag.

In accordance with a third preferred embodiment of bag 200, illustrated in Figure 8, a first and a second band 140a, 140b are provided for sealing corresponding bellows 16, 18, both having a reduced longitudinal dimension, or ending with a respective end 16 ', 18' which is spaced longitudinally from the upper edge 41 of the bag.

According to this third preferred embodiment, longitudinally below the respective sealing band 140a, 140b of corresponding ends of bellows 16, 18 are provided with the oblique welds 190, 210 and 230, 250, which join the flaps 19, 21 and 23, 25 of the respective bellows with the front and rear walls 12, 14, in such a way as to define means for conveying the product outgoing.

A second preferred embodiment of the method for manufacturing the present bag, in particular the bag according to the first preferred embodiment, is illustrated in Figures 9 and 10. In accordance with this second embodiment of the method, the use of a plurality of films is envisaged. 351, 352, 353, 354, which are unwound from respective reels 301, 302, 303, 304, for the realization, respectively, of the front and rear walls and of the side walls, or bellows, of the bag. In particular, according to the second preferred embodiment, provision is made for feeding a first and a second film 351, 352, which are intended to form the front and rear walls of the bags according to a horizontal path and for transversally inserting respective films 353, 354, suitably folded to define corresponding bellows of the bags. As shown in particular in Figure 10, it is advantageously provided to provide a transversal insertion of the bellows films 353, 354, which is such as to provide for the insertion, for each longitudinal section of the assembled film which is intended to define a respective bag , of bellows 318, 316, which have a differentiated length, in particular long bellows 316, which extend substantially for the entire width of the films 351, 352 for the front and rear walls and short bellows 318, which extend starting from a lateral end of said films of films 351, 352, only for a portion of the respective width of films 351, 352. The gripping portion 33 of the bag is subsequently arranged in correspondence with said short bellows 316.

A third preferred embodiment of the method for manufacturing the present bag, in particular the bag according to the first preferred embodiment, is illustrated in Figure 11. In accordance with this third embodiment of the method, the use of a plurality of films 451 is envisaged, 452, 453, 454, which are unwound from respective reels, not particularly illustrated in the figure, for the realization of the front and rear walls and the side walls or bellows of the bag, respectively. In particular, according to the third preferred embodiment, provision is made for feeding a first and second films 451, 452, which are intended to form the front and rear walls of the bags according to a vertical orientation and for inserting respective films 453, 454 transversely, suitably folded to define corresponding bag gussets. As shown in particular in Figure 11, it is advantageously provided to carry out a transversal insertion of the bellows films 453, 454, which is such as to provide for the insertion, for each section intended to define a respective bag, of bellows 418 , 416 which have a differentiated length, in particular long bellows 416 and short bellows 418, in correspondence with which the bag gripping portion 33 is subsequently arranged, substantially as already referred to in relation to the previous procedure of Figures 9 and 10.

A fourth preferred embodiment of the method for manufacturing the present bag, in particular the bag according to the first preferred embodiment, is illustrated in Figure 12. In accordance with this fourth embodiment of the method, the use of a plurality of films 551 is envisaged, 552, 553, 554, which are unwound from respective reels, not particularly illustrated in the figure, for the realization of the front and rear walls and the side walls or bellows of the bag, respectively. In particular, in accordance with this fourth preferred embodiment, provision is made for feeding a first and a second film 551, 552, which are intended to form the front and rear wall of the bags according to a vertical orientation and for longitudinally inserting respective films 553, 554 , suitably folded to define corresponding bellows of the bags. As Figure 12 illustrates, it is advantageously provided to provide a longitudinal insertion of the bellows films 553, 554, which is such as to provide for the insertion, for each section intended to define a respective bag, of bellows which have a differentiated length, in particular a long bellows and a short bellows, in correspondence of which short bellows the bag gripping portion 33 is subsequently arranged.

Figure 13 illustrates a fourth embodiment of bag 600. In accordance with this fourth preferred embodiment of bag it is provided that, for the sealing of corresponding bellows 16, 18, the extreme portions 619 ', 621', 623 'and 625' of the flaps 19, 21 and 23, 25 of the respective bellows are turned backwards, i.e. towards the bottom of the bag and joined, in particular welded, to the respective and counter-facing portion of the front and rear wall 12, 14. In this way, it is possible to obtains a sealing of the bellows without resorting to specific closing bands.

Figure 14 illustrates a fifth preferred embodiment 700 of pouch. In accordance with this fifth preferred embodiment of the bag, provision is made for a pre-weakened removal line 731 for a corner portion of the bag, in which said pre-weakened line 731 extends with a respective longitudinal section 731 a, on the front and rear walls of the bag and with a respective transverse section 731 b, provided on said front and rear walls and on the flaps of the bellows. Said pre-weakened line 731 is advantageously in the form of a thinning of the thickness of the film, made of plastic material and is, in particular, obtained by laser engraving. In correspondence with said pre-weakened line 731, advantageous means for initiating the breaking can be provided. In this way, an outlet for the product is obtained which opens both in the longitudinal direction of the bag and in the transverse direction thereto.

The bands, or strips, 40, 140a, 140b for sealing the bellows, are preferably made of heat-sealable material, especially of material that can be heat-sealed on both sides or faces.

the invention thus conceived is susceptible of evident industrial application; moreover, it can be subject to numerous modifications and variations, all of which are within the scope of the inventive concept. Furthermore, all the details can be replaced by technically equivalent elements.

Claims (65)

CLAIMS 1. Bag (10) for containing a product (P), in particular in the form of a food product, preferably in the form of a granular product or in pieces; said bag having a body of the bag, preferably made of flexible material, such as plastic film, and comprising a front wall (12), a rear wall (14), and a respective bellows defined by opposing flaps (19, 21, and 23, 25); characterized in that it presents a portion (33) for joining the front wall (12) and the rear wall (14) of the bag, which joining portion (33) is provided on the extension of the flaps (23, 25) with the corresponding bellows (18). Bag according to claim 1 or according to the pre-characterizing part of claim 1, characterized in that it has means (33) for gripping the bag on the extension of a respective bellows (18). 3. Bag according to claim 2, characterized in that said joining portion (33) defines gripping means for the bag. 4. Bag according to any of the preceding claims, characterized by the fact that said union portion (33) has a width such as to allow the engagement of at least one finger of the user. 5. Bag according to claim 4, characterized by the fact that said union portion (33) has a width such as to allow the engagement of at least a plurality of the user's fingers. 6. Bag according to any of the previous claims, characterized by the fact that said union portion (33) extends longitudinally between the end (18 ') of the respective bellows (18) and the upper edge (41) of the bag. 7. Bag according to any of the preceding claims, characterized by the fact that said union portion (33) extends transversely for at least part, in particular for the entire width of the corresponding bellows (18). Bag according to any one of the preceding claims, characterized in that, in said union portion (33), at least one hole (35) for inserting and gripping the bag is obtained. 9. Bag according to claim 8, characterized in that said hole (35) is in the form of an oblong hole. 10. Bag according to claim 9, characterized in that said oblong hole (35) extends longitudinally to the bag. 11. Bag according to any of the previous claims or according to the pre-characterizing part of claim 1, characterized by the fact of comprising a bellows (16) which extends longitudinally beyond the longitudinal end (18 ') of the other bellows (18). Bag according to claim 11, characterized in that means (33) for gripping the bag are provided which are arranged on the extension of the short bellows (18). 13. Bag according to any one of the preceding claims or according to the pre-characterizing part of claim 1, characterized in that it presents a bellows (16) which is able to define means for conveying the product (P) out of the bag (10). 14. Bag according to claim 13, characterized in that said means for conveying the product (P) out of the bag (10) are defined by the longer bellows (16) of the bag. 15. Bag according to any one of the preceding claims or according to the pre-characterizing part of claim 1, characterized in that it comprises an outlet (30) for the product (P) to come out, which opens at the flaps (19, 21) defining a respective bellows (16). 16. Bag according to claim 15, characterized in that the respective bellows (16) in correspondence with said outlet mouth (30) can be displaced between an at least partial closure configuration of the product outlet mouth (30), and a configuration of free exit of the product (P) through said mouth (30). 17. Bag according to any one of the preceding claims 15 and 16, characterized in that said bellows (16) has a longitudinal end (16 ') which is suitable, in a retracted condition towards the inside of the bag, to define means of closing the mouth (30) for the product to flow out. 18. Bag according to any one of the preceding claims from 15 to 17, characterized in that said bellows (16) has a configuration such as to allow the product to come out, when the respective flaps (19, 21) are provided in a condition of extension towards the outside of the bag. 19. Bag according to any one of the preceding claims 15 to 18, characterized in that the bag is such as to allow the bellows (16) to open due to the weight of the product (16) and to reseal elastically, when said product (P ) no longer weighs on the bellows (16). Bag according to any one of the preceding claims from 15 to 19, characterized in that it comprises an outlet (30) for the product (P) to exit at one end (16 ') of the respective bellows (16) . 21. Bag according to any one of the preceding claims from 15 to 20, characterized in that it comprises an outlet (30) for the product (P) to exit, which opens on the opposite transverse side to that in which said gripping means (33) are provided of the bag. Bag according to claim 21, characterized in that said bag gripping means (33) are transversely aligned with the product outlet (P) mouth (30). 23. Bag according to any of the previous claims from 15 to 22, characterized by the fact that said outlet is defined by a corresponding oblique edge (30 '). Bag according to any one of the preceding claims from 15 to 23, characterized in that said outlet mouth (30) is defined by opposite edges (19 ', 21') of the flaps (19, 21) of the corresponding bellows (16) . 25. Bag according to any one of the previous claims from 15 to 24, characterized by the fact that said outlet mouth (30) is defined by edges (126 ', 146') of the front and rear walls (12, 14) of the bag. 26. Bag according to any one of the preceding claims 24 and 25. characterized in that said edges (19 ', 21') defining the outlet mouth (30) in correspondence with the flaps (19, 21) of the corresponding bellows (19) prolong obliques. 27. Bag according to any one of the preceding claims 25 and 26, characterized in that said edges (126 ', 146') defining the outlet mouth (30), which are provided in correspondence with the portions of the front and rear walls (12, 14) of the bag facing the corresponding flaps (19, 21) of the bellows (16), extend obliquely. Bag according to any one of the preceding claims from 15 to 27, characterized in that said outlet mouth (30) opens in the longitudinal direction of the bag. Bag according to any one of the preceding claims from 15 to 28, characterized in that said outlet mouth (30) extends for a short transverse section of the bag. Bag according to any one of the preceding claims from 15 to 28, characterized in that said outlet mouth (30) opens in a direction transversal to the bag. 31. Bag according to any one of the previous claims from 15 to 30, characterized by the fact that said outlet mouth (30) extends transversely substantially for the entire width of the corresponding bellows (16). Bag according to any one of the preceding claims or according to the pre-characterizing part of claim 1, characterized in that it has a transverse edge (41) for closing the bag. 33. Bag according to claim 32, characterized by the fact that said transverse closing edge (41) is defined by the union of corresponding and opposite portions of the front wall and of the rear wall (12, 14) of the bag. 34. Bag according to any one of the preceding claims 32 and 33, characterized in that said transverse closing edge (41) is defined by the union of corresponding and opposite portions of the front wall and of the rear wall (12, 14) of the bag with of the flaps (19, 21) of the bellows (16). 35. Bag according to any one of the preceding claims from 32 to 34, characterized in that said mouth (30) for outflowing the product opens in correspondence with a lateral area of said transverse edge (41). 36. Bag according to any one of the preceding claims or according to the pre-characterizing part of claim 1, characterized in that it presents, in correspondence with a respective side, a first and a second longitudinal closing edges (31s, 33s) of the bag which are provided between said front wall (12) and the opposite flap (19) of the bellows and between said rear wall (14) and the opposite flap (21) of the bellows (16). A bag according to claim 36, characterized by the fact that it has a product outlet (30) which opens at said longitudinal edges (31s, 33s). 38. Bag according to claim 37, characterized in that said mouth (30) for outflowing the product opens in correspondence with an extreme upper zone of said longitudinal edges (31s, 33s). 39. Bag according to any one of the preceding claims or according to the pre-characterizing part of claim 1, characterized in that the respective bellows has a longitudinal edge (16a) for joining the corresponding flaps (19, 21) of the bellows which has one end which extends at the transverse closing edge (41). Bag according to any one of the preceding claims or according to the pre-characterizing part of claim 1, characterized in that a pre-weakened line (31) is provided for removing a portion (10 ') of the bag which is able to define a mouth (30) product leakage (P). 41. Bag according to claim 40, characterized by the fact that said pre-weakened removal line (31) is adapted to allow the removal of a corner portion (10 ') of the bag. 42. Bag according to any one of the preceding claims 40 and 41, characterized in that said pre-weakened line (31) extends obliquely. Bag according to any one of the preceding claims 41 to 42, characterized in that said pre-weakened line (31) is in the form of a thinning of the material defining the bag. Bag according to claim 43, characterized in that said pre-weakened line (31) is in the form of a thinning obtained by laser engraving. 45. Bag according to any one of the preceding claims from 41 to 44, characterized in that in correspondence with said pre-weakened line (31) there are provided means (31 a, 31 b) for inviting the break. 46. Bag according to claim 45, characterized by the fact that at the end of said pre-weakened line (30) there is a corresponding notch (31 a, 31 b) defining means of invitation to break. 47. Bag according to any one of the preceding claims 41 to 46, characterized in that said pre-weakened line (31) extends over the flaps (19, 21) of the respective bellows (16). Bag according to any one of the preceding claims 41 to 47, characterized in that said pre-weakened line (31) extends over the front and rear walls (12, 14) of the bag. 49. Bag according to any one of the preceding claims or according to the precharging parity of claim 1, characterized by the fact that sealing means (40) are provided for the corresponding end (18 ') of the bellows (18). 50. Bag according to claim 49, characterized in that said sealing means (40) of the end (18 ') of the bellows (18) are in the form of a sealing band (40). 51. Bag according to any one of the preceding claims 49 and 50, characterized in that said portion (33) defining the gripping means extends in correspondence with said sealing means (40) of the end (18 ') bellows (18) . Bag according to any one of the preceding claims or according to the precharging part of claim 1, characterized in that there are provided means (53, 63) for gripping the bag which are provided on the longitudinal side opposite to the product outlet side. 53. Bag according to any one of the preceding claims or according to the precharacterizing part of claim 1, characterized by in that there are provided means (53, 63) for gripping the bag which are provided on the longitudinal side opposite to that of the first gripping means (33). Bag according to any one of the preceding claims or according to the pre-characterizing part of claim 1, characterized in that there are provided means (53, 63) for gripping the bag which are provided at the bottom of the bag. Bag according to any one of the preceding claims or according to the pre-characterizing part of claim 1, characterized in that means (53, 63) are provided for gripping the bag in correspondence with the relative bellows (16, 18). Bag according to any one of the preceding claims or according to the pre-characterizing part of claim 1, characterized in that there are provided means (63) for gripping the bag which are longitudinally aligned with the product outlet mouth (30). Bag according to any one of the preceding claims or according to the pre-characterizing part of claim 1, characterized in that there are provided means (53) for gripping the bag which are substantially aligned with the first gripping means (33) of the bag. Bag according to any one of the preceding claims, characterized in that at least one hole (55, 65) for inserting and gripping the bag is formed in said joining portion (33) of the bag gripping means (53, 63). 59. Bag according to any one of the preceding claims from 15 to 58, characterized in that said outlet mouth is defined by a corresponding longitudinal edge (731 a). 60. Bag according to any one of the preceding claims from 15 to 59, characterized in that said outlet mouth is defined by a corresponding transverse hem (731 b). 61. Bag according to claim 49, characterized in that said means for sealing the end of the bellows (618) are in the form of respective end portions (619 ', 621', 623 ', 624') of the flaps (619, 621 , 623, 625) of the respective bellows which are turned backwards and joined to the respective and facing portions of the front and rear walls. 62. Process for making bags (10), in which it is envisaged to feed a film (51), preferably in the form of a plastic film, in particular in the form of a flexible plastic film, and to make, in said film ( 51), at least a bellows recessed portion, in particular a first and second bellows recessed portions (56, 58); characterized in that, in said film (51), an opening (57) is provided in said film and, transversely spaced from said opening (57), a pre-weakening line (319, 321, 312, 314). 63. Bag according to claim 62, characterized in that said pre-weakening line (319, 321, 312, 314) is transversely aligned with said opening (57). 64. Process for making bags (10), in which it is envisaged to assemble a plurality of films, preferably in the form of a plastic film, in particular in the form of a flexible plastic film, suitable for defining the front, rear and the bellows of the bag, in which the corresponding films defining the said bellows of the said bag are inserted between the films that define the front and rear walls of the bag; characterized in that films defining the bellows of the bag, which have different lengths, are inserted between the films that define the front and rear walls of the bags. 65. Bag and method according to the preceding claims and according to what is described and illustrated with reference to the figures of the accompanying drawings and for the aforementioned purposes.