ITFI20120171A1 - "SHOCKPROOF BAG FOR PRODUCTS TO BE PROTECTED, OF THE TYPE INTENDED TO BE FILLED WITH AIR AND PROCEDURE TO REALIZE THE BAG" - Google Patents

Description

â € œSHOCK BAG FOR PRODUCTS TO BE PROTECTED, OF THE TYPE DEED TO BE FILLED WITH AIR AND PROCEDURE FOR REA-LIZING SAID BAGâ €

DESCRIPTION

Technical field

The present invention relates to the field of the production of bags to protect the products contained therein from impact, and more particularly it relates to a shockproof bag of the type comprising an external pocket which contains an internal pocket suitable to contain the product to be protected, and in which pressurized air is introduced into the external pocket, while, preferably, a vacuum is created in the internal pocket housing the product.

The present invention also relates to a process for making a shockproof bag of the type described above.

In this report, by shockproof bag we mean an artifact whose subsequent destination after its production involves the association of one or more products to be protected and the introduction of pressurized air (and possibly the creation of a vacuum in the pocket housing the products) and the subsequent airtight sealing of the product to prevent air from escaping.

State of the art

As is known, in order to adequately protect particularly delicate objects during transport, protection packs are known which envisage the use of two distinct bags, a first, smaller bag in which to introduce the product to be protected, and a larger bag. , in which the smallest bag is inserted. With a special machine, the edges of the respective openings of the two bags are welded together and, at the same time, air is sucked from the inner bag (with the product already inserted in it) and air blown into the larger bag, so that the product is vacuum-packed in the the inner bladder and in the outer bladder an air cushion is formed that surrounds the inner bladder, which remains â € œhangingâ € to the flaps of the welded opening of the outer bladder.

However, the shockproof package thus formed has some drawbacks. For example, the operations of inserting the two bags and inserting the product into the innermost bag, as well as their simultaneous association with the device that carries out the insufflation and aspiration of the air and the sealing of the bags, are particularly cumbersome for the € ™ operator, and therefore poorly suited to all those cases in which the batch of products to be packaged is particularly large.

Furthermore, this type of bag cannot be used with products that require a certain degree of thermal insulation, such as medicines. In this case, in fact, at present, rigid polystyrene packages are used to protect the products from both impact and thermal shock, possibly with the introduction of further polystyrene â € œchipsâ €. This type of packaging is generally very voluminous, if compared to the volume of product it contains and therefore it is excessively bulky.

Purpose and summary of the invention

The aim of the present invention is to solve the problems associated with the packaging of products to be protected during transport highlighted above.

Within this task, an important object of the present invention is to provide a shockproof bag to protect products that allows the products to be packaged quickly and safely.

Another important object of the present invention is to provide a shockproof bag to protect products which has an improved impact resistance.

Another important object of the present invention is to provide a shockproof bag to protect products that also protect them from thermal shocks.

Not the least object of the present invention is to develop a process for making shockproof bags for the protection of products which allows to speed up and simplify the product packaging process.

These and other objects, which will become clearer in the following, are achieved with an impact-resistant bag according to what is reported in the following claim 1 and with a process according to claim 9.

According to a first aspect, the invention therefore relates to a shockproof bag for protecting products, of the type intended to be filled with air, comprising an external pocket and a pocket inside the external pocket intended to accommodate the product to be protected, in which the space between the pockets defines an interspace which, during the use of the bag, is able to contain pressurized air to protect the contents of the inside pocket; the external pocket is formed by two portions of at least one first film facing and joined along the bottom of this external pocket, called external bottom, and along the two opposite sides of the same external pocket, called external sides; the internal pocket is made up of at least two portions of at least a second film facing each other and joined together and joined to the external pocket at least in correspondence with the external sides of the latter; said internal pocket has a respective bottom, called internal bottom, and opposite sides, called internal sides, which develop from said internal bottom; there are two opposite bands of said at least one second film delimited by the external sides of the external pocket and by the internal sides of the same internal pocket; said external pocket and said internal pocket have respective openings respectively for the insufflation of air into the interspace defined between the two said pockets and for the introduction of the product to be protected into the bag.

The expressions `` two portions of at least one first film '' and `` two portions of at least a second film '' must be understood according to different possible combinations, i.e. two portions can be part of a single film or two portions can constitute or be part of respective movie.

Preferably, the portions of said at least one second film are also joined to the external bottom of the external pocket, defining a further band comprised between the external bottom and the internal bottom of the internal pocket; between said internal pocket and the external sides and bottom of said external pocket there is therefore a U-shaped band formed by said second portions of film which connects the walls of the internal pocket and the walls of the external pocket.

Preferably, the aforementioned interspace is defined by two chambers separated by said portions of at least one second film. Preferably, such chambers have a fluid communication passage; preferably said passage is made near the external bottom.

According to preferred embodiments, the two portions of said at least one film are formed by a single first film folded at 180 °; in the folding area of the first film, a heat-sealing bonding of the portions of said at least one second film and of said first film is made; preferably, this connection heat-sealing has at least one interruption capable of defining at least one non-welded area which constitutes the passage of fluid communication between said two chambers of the interspace.

Preferably, the openings of the two external and internal pockets are made on the respective pocket sides opposite the respective bottoms.

Preferably, the joining areas of the portions of the films which define the sides and bottoms of said pockets are formed by heat-sealing lines.

According to preferred embodiments, the internal pocket is substantially isothermal and / or is formed by heat-insulating material.

According to preferred embodiments, the internal pocket is formed by two assemblies each formed by at least three portions of second films superimposed on each other and joined along the perimeter of the external pocket and of the internal pocket. Preferably, each assembly is formed by three portions of second film superimposed on each other and in which the central film of the assembly is formed by an expanded plastic material of the open or closed cell type. Preferably, the first film that forms the external pocket comprises an external layer in polyacetylene (PA) and an internal layer in polyethylene (PE), while in said assembly of three portions of second film, a second internal film, that is, which looks towards the € ™ inside of the internal pocket, is in polyethylene (PE), a second central film is in an expanded plastic material of the type with open or closed cells, and a said second external film, that is, which looks towards the external pocket, It is made in at least three layers, with the two outer layers in polyethylene (PE) and the central layer in polyacetylene (PA) possibly metallized.

According to another aspect, the invention relates to a package made with a bag according to one or more of the aspects presented above, in which a product is housed in the internal pocket and is preferably â € œstained under vacuumâ €, while in the cavity, or in the external pocket, there is air with a pressure higher than atmospheric pressure, which inflates the external pocket itself and in which a weld is present along the external opening and the internal opening of the two pockets, so such that the two pockets are individually sealed, ie sealed with respect to the external environment and one with respect to the other.

According to another aspect, the invention also relates to a system for making a package as presented above, which involves using a bag according to one or more of the aspects presented above, sucking air from the internal pocket and at the same time blowing air into the external pocket, with simultaneous sealing of the two pockets.

According to a further important aspect, the invention relates to a process for making shockproof bags for the protection of products, of the type comprising an external pocket to be filled with pressurized air and a pocket inside the external pocket in which to place the product, said process comprising the

- the formation of a grouping by overlapping each other of at least four portions of film, respectively at least two outermost portions and at least two inward portions of the superimposed grouping;

- the welding of said at least two portions of film more internal to the superimposed grouping, creating a pocket, called internal pocket, equipped with an opening, called internal opening; this internal opening is made for a subsequent reception of the product to be protected;

- the welding of said at least two portions of film outermost to said superimposed grouping, creating a further pocket, called external pocket, which contains the internal pocket and which defines the external part of said bag, which is also equipped with an opening, called external opening, in such a way as to create at least an interspace between said internal and external pockets open for the subsequent insertion of the inflating air of the bag.

The term `` innermost '' and `` outermost '' portions refers to the grouping, if we think of an intermediate point of the grouping, respectively to the portions closest to this intermediate point and to the portions farthest from this intermediate point ( if we think of the grouping as a structure of vertically superimposed `` horizontal layers '', the outermost layers are the highest and the lowest, while the innermost layers are those included between the highest and the lowest layer).

Preferably, the grouping of at least four portions of films superimposed on each other develops continuously along a processing line.

Preferably, said at least four film portions have the same dimensions in plan.

Preferably, the at least two outermost film portions of the superimposed grouping are equal and arranged symmetrically with respect to a plane substantially parallel to them and passing through the center line of the grouping, or arranged between the at least two innermost film portions.

Preferably, the innermost film portions of the grouping are the same and arranged symmetrically with respect to a plane substantially parallel to them and passing through the center line of the superimposed grouping, or arranged between the at least two innermost film portions.

According to preferred embodiments, the overlap between them of at least four portions or films is achieved by folding at least two superimposed films by 180 °, so that the at least two outermost film portions of the grouping are part of at least the same folded film and similarly, said at least two portions of the inner film of the grouping are part of at least the same folded film. Preferably there is a single film folded to form the two outermost film portions of the grouping. Preferably there are at least two films superimposed and folded to form two assemblies of at least two portions of films more internal to the grouping.

According to advantageous embodiments, the welding steps of the various film portions of the grouping to make the pockets occur by means of a thermal action which acts on the external face of at least one of the outermost film portions of said grouping. By external face we mean the face of the portion that looks towards the outside of the grouping.

According to particularly preferred embodiments, the sealing of the first pocket takes place by means of a thermal action which acts on the external face of at least one of the outermost film portions of said grouping and with the interposition of non-stick means between the portions of films more external to the grouping and those portions of films more internal to the grouping immediately close to the most external portions of the grouping; such non-stick means prevent the sealing between said inner and outer film portions of the grouping, and are suitable to simultaneously allow the passage of heat for the sealing of the film portions innermost to the grouping; preferably said non-stick means being Teflon sheets.

In the case of such non-stick means, the process preferably provides for the movement along a working line of the overlapping film portions, along this line being provided, on the same part of the continuous development of the grouping which will correspond to a bag:

- the welding of the bottom of the external pocket; this welding involves sealing all the film portions of the grouping together;

- the interposition of the non-stick media between the outermost film portions and the innermost film portions of the grouping close to the outermost film portions of the grouping;

- the realization of a thermal action on the external face of at least one of the outermost film portions of the grouping, to carry out the welding of the most internal film portions of the grouping, to form the bottom and the two parallel sides, orthogonal to the bottom, inside pocket,

- carrying out a thermal action on the external face of at least one of the outermost film portions of said grouping, to carry out the welding of two parallel sides of the external pocket, orthogonal to the bottom of the external pocket; this welding involves joining together all the internal and external film portions.

According to other preferred embodiments, in the case of these non-stick means, the process preferably provides for the movement along a working line of the portions of the grouping formed by a first continuous film folded at 180 ° and constituting the two continuous portions of film more external to the grouping and at least two, preferably three, second continuous films superimposed and folded at 180 ° to form two sets of at least two, preferably three, continuous portions of films innermost of the grouping; the widths transversal to the direction of movement along the working line of the portions of the first film and of the portions of the second films are preferably approximately equal to each other; along this line are provided, preferably in sequence on the same part of the continuous development of the grouping,

- the sealing of the bottom of said external pocket which provides for sealing together all the portions of the first and second films, preferably in correspondence with a longitudinal edge of the grouping,

- the interposition of the non-stick media between the external portions of the first film and the portions of the second film closest to the first film, designed to prevent the welding of said portions of the first and second film close to the first film and to allow the passage of heat for the subsequent sealing of the portions of the second film,

- the realization of a thermal action on the external face of a portion of said first film, to weld the portions of the second film to form the bottom and the two parallel sides, orthogonal to the bottom, of the internal pocket,

- the realization of a thermal action on the external face of a portion of said first film, to carry out the welding of two parallel sides of said external pocket, orthogonal to the bottom of the external pocket, which provides for welding together all the portions of film .

Preferably, if the non-stick means are not present, the welding steps of the various film portions provide for a thermal action carried out on the external face of at least one of the outermost film portions of the grouping to create the closed perimeter of the external pocket, with the exception of the external opening, and a thermal action carried out on the outermost face of at least one of the portions of the film more internal to the grouping to create the closed perimeter of the internal pocket, except for said internal opening.

In the latter case, preferably, said thermal action carried out on the outermost face of at least one of the film portions innermost to the grouping to create the closed perimeter of the internal pocket, provides for a sealing thermal source arranged between at least one of the film portions outermost of the grouping and the innermost portion of the film close to said at least one of the outermost film portions; preferably this heat source has a U shape; preferably there are some spreading elements able to keep spaced apart said at least one of the film portions most external to the grouping and the film portion innermost to the grouping close to said at least one of the most external film portions.

Preferably, if the non-stick means are not present, the movement along a working line of the portions of said grouping formed by a first continuous film folded at 180 ° (and constituting the two continuous portions of film more external to the grouping), and by at least two, preferably three, second continuous films superimposed and folded at 180 ° to form two assemblies of at least two, preferably three, continuous portions of films innermost of the grouping; preferably the widths transversal to the direction of movement along said working line of the portions of the first film and of the portions of the second film are approximately equal to each other; along this line, on the same part of the continuous development of the grouping are foreseen:

- the welding of the bottom and the parallel sides of the external pocket, which involves welding together all the film portions of the grouping; this welding takes place with a thermal action carried out on the external face of at least one of the outermost film portions of the grouping,

- the interposition of spreading elements designed to keep said at least one of the most external film portions of the grouping apart and the second film portion internal to the grouping close to said at least one of the most external film portions to the grouping,

- the realization of a thermal action on the external face of at least one of the innermost film portions of said grouping, to carry out the welding of the innermost film portions of the grouping, to form the bottom and the two parallel sides, orthogonal to the bottom , of the inside pocket; this thermal action is achieved by means of a sealing thermal source arranged between at least one of the outermost film portions and the innermost film portion close to said at least one of the outermost film portions.

Preferably, the welding of the parallel sides of the external pocket takes place after the welding of the bottom of said external pocket and after the welding of the perimeter of the internal pocket.

According to preferred embodiments, the welding of the parallel sides of the external pocket takes place with substantially linear thermal sources having a length at least equal to the transverse length of the continuous longitudinal extension of said grouping.

According to preferred embodiments, the welding of the bottom of said external pocket provides for the realization of at least two welding sections spaced from each other by a section without welding, this welding preferably takes place at a longitudinal edge of said grouping.

In preferred embodiments, this grouping develops continuously along a working line; this method further comprises, after the welding steps for making the internal and external pockets, a transversal cutting step of said welded grouping to create individual shockproof bags.

Brief description of the drawings

Further characteristics and advantages of the invention will become clearer from the description of some of its preferred but not exclusive embodiments, illustrated by way of non-limiting example in the attached drawings, in which

figure 1 represents a schematic axonometric view of an impact-resistant bag according to the invention, with the openings of the checkmate pockets spread apart;

Figure 2 is a schematic cross-sectional view of the bag of Figure 1;

figure 3 represents a schematic axonometric view of a package formed by a shockproof bag according to the invention, in which a vacuum-packed product is inserted in the internal pocket and the external pocket is filled with pressurized air and sealed;

figure 3a represents a schematic axonometric view of a portion of the package of figure 3 relative to the bottom of the external pocket, according to a partially sectional view;

figure 4 is a schematic side view in longitudinal section of the package of figure 3;

figure 5 represents a schematic front view in cross section of the package of figure 3;

figure 6a is a front view of a diagram of a line for carrying out a process for making a bag according to the invention;

figure 6b is a top view of the line diagram of figure 6a; Figure 6c is a side view of the line diagram of Figure 6a; Figures 7 and 8 are two different ways of unwinding the films that make up the bag, varying with respect to the method of the procedure of Figures 6; figure 9 represents a schematic section of the films that make up the bag according to the invention;

figure 10 is a section of a multilayer film that makes up one of the films of figure 9;

Figure 11 represents a schematic axonometric view of an impact-resistant bag according to the invention, with the openings of the checkmate pockets spread apart, made with the procedure shown in Figures 6a, 6b and 6c;

figure 12 represents a schematic axonometric view of a package formed by a shockproof bag according to figure 11, in which a vacuum-packed product is inserted in the internal pocket and the external pocket is filled with pressurized air and sealed;

Figure 13a is a front view of a diagram of a line for carrying out a process for manufacturing the bag of Figure 1;

figure 13b is a top view of the line diagram of figure 13a; Figure 13c is a side view of the line diagram of Figure 13a. Detailed description of an embodiment of the invention

With reference to the aforementioned figures, a shockproof bag according to the invention is indicated as a whole with 10. The letter C (see Figures 3, 4, 5 and 12) indicates a package formed by a bag 10 in which A product P e is inserted which is swollen with air, as explained further on.

The bag 10 comprises a pocket, called external pocket 11, formed by two portions 12A of a first film 12 made of heat-sealable material (the first film is preferably transparent or translucent and is drawn with continuous lines), preferably quadrangular, equal and facing each other. between them and heat-sealed along the edges, and in particular along the bottom of the pocket, defined external bottom 13 and along the two opposite and parallel sides that develop from the external bottom, called external sides 14. The heat-sealing strips along the external sides are indicated with T1, while the heat sealing on the external bottom 13 is made in two separate sections indicated with T2.

The bag 10 also comprises a further pocket, inside the external pocket 11, called the internal pocket 15 and also formed by portions of second films (drawn with dash-dot lines in figures 1, 2, 3, 4, 5, 11 and 12) facing and overlapping, described a little further on. This pocket 15 is designed to accommodate the product P to be protected during use.

The space between the external and internal pockets defines an interspace (formed by two chambers 16A and 16B) which, during the use of the bag as a package, is able to contain pressurized air (i.e. a pressure greater than the pressure environment) to protect the contents of the inside pocket.

Preferably, the internal pocket 15 is formed by two assemblies 17 (for reasons of graphic clarity, in the figures the two assemblies 17 are schematized by single lines) each preferably formed by at least three portions 18A, 18B and 18C (schematized only in figure 9 ), heat-sealable, quadrangular, of respective second films 18â € ™, 18â € ™ â € ™ and 18â € ™ â € ™. Said portions 18A, 18B and 18C are superimposed on each other and joined along the perimeter of the external pocket 11 and of the internal pocket 15.

The internal pocket 15 comprises a bottom, called internal bottom 19 from which two opposite and parallel sides, called internal sides 20, develop.

In practice, the two assemblies 17 of portions of second films 18A, 1B, 18C are heat-sealed on their periphery to the portions 12A of first films 12 in correspondence with the heat-sealing of the external sides T1 and of the external bottom T2. Furthermore, the two assemblies 17 of portions of second films 18A, 1B, 18C are heat-sealed together along the internal sides 20 and the internal bottom 19 of the internal pocket 15; the respective heat-sealing strips are indicated with T3 (sides) and T4 (bottom).

There are therefore two opposing bands 21 formed by the two assemblies 17 of the second film portions, delimited by the external sides 14 of the external pocket 11 and by the internal sides 20 of the internal pocket 15, as well as a further band 22 between the external bottom 13 of the external pocket 11 and the internal bottom 19 of the internal pocket 15. Therefore between the internal pocket 15 and the sides 14 and the bottom 13 of the external pocket 11 there is a U-shaped band 21-22 which connects the walls of the internal pocket 15 and the walls of the external pocket 11, formed by the portions of second film facing each other and superimposed on each other (these portions of second film are joined only in correspondence with the heat-sealing areas).

On the front side of the bag, the one free from welds, or opposite to the bottoms 13 and 19 of the two pockets, there is an opening in the external pocket, called external opening 23, and an opening in the internal pocket, called internal opening 24, respectively for the insufflation of air in the interspace 16A-16B defined between the two pockets and for the introduction of the product to be protected in the bag (which, as mentioned, will be housed in the internal pocket).

The interspace is formed, as mentioned, by two chambers 16A and 16B, which are separated from the coupled assemblies 17 (which in practice act as a separator partition in the interspace). There is preferably a passage 25 between the two chambers; when the bag is closed and swollen to form the package C, this passage 25 allows to communicate fluidly between the two chambers and therefore to have the air in the chambers with the same pressure.

The passage 25 is preferably made in proximity to the external bottom 13. More specifically, as will become clearer later, this passage is defined in correspondence with an unsealed area 26 in correspondence with the T2 weld of the external base 13. In practice the two portions 12A are formed by a single first film 12 folded at 180 °. In the folding area of the first film 12 (indicated by 13A in figure 3a), the heat-sealing T2 is made for joining the edges of the portions of the second films of the assemblies 17, opposite the internal opening 24, and of the first film 12, which defines the outer bottom 13 of the bag; the heat sealing has, in this example, an interruption (the welding is defined by two segments T2, spaced apart and aligned) which defines the non-welded area 26. Therefore in this area 26 the assemblies 17 of the second film portions are not joined to the first film 12 and the air can pass (arrow A in figure 3a) from chamber 16A to chamber 16B and vice versa. The air cannot get out of the package in this area because the external bottom here is made up of the folded area 13A of the first film 12.

In each assembly 17 formed by three portions of second film, a second film 18â € ™ â € ™ â € ™, internal, that is, which looks towards the inside of the internal pocket 15, is in polyethylene (PE), a second central film 18â € ™ â € ™ is in an expanded plastic material of the type with open or closed cells, in or based on polyethylene (PE), that is a thermal insulating material, and a second film 18â € ™, external, that is towards the external pocket 11, it is made in three layers, with the two external 18xâ € ™ layers in polyethylene (PE) and the central 18yâ € ™ layer in polyacetylene (PA), possibly metallized. The first film 12 is preferably translucent or transparent and comprises polyethylene (PE) and more preferably it is a multilayer film formed by an outer layer of polyacetylene (PA) and an inner layer (that is, facing the inner pocket 11) of polyethylene ( PE). Therefore, the indicated film portions are heat-sealable to each other.

Note how the bag thus created is a shockproof bag which greatly simplifies the preparation phase of package C, as it has a structure already assembled to be easily filled with the product to be protected and easily filled with air, without need for special skills on the part of the operator. Furthermore, the lateral bands 21 which surround the internal pocket 15 and connect this to the external sides of the external pocket 11, act as additional protections which contribute to increasing the degree of protection of the product and stabilizing the same inside the internal pocket.

By using heat-insulating material to make the internal pocket, the bag can also be used as a bag to avoid thermal shocks to the product it contains. In particular, the bag structure as presented allows to realize an internal heat-insulating pocket in a simple and compatible way with the external pocket. Furthermore, the air gap helps to increase the degree of thermal insulation of the inner pocket. Note how the size of the bag is much smaller than the size of a rigid thermal insulating package.

Figures 11 and 12 show respectively a bag according to the invention, structurally similar to the bag of figure 1 but with some slight differences deriving from the manufacturing process adopted for its manufacture, and a relative package. The bag in figure 11 is still indicated with the number 10 and the package in figure 12 is still indicated with C.

In particular, the bag of figure 11 shows on the portions of the first film 12A impressions T3â € ™ and T4â € ™ substantially corresponding to the sealing strips T3 and T3 of the internal sides 20 and of the internal bottom 19 of the internal pocket 15 (note how, in in this example, the welding strip T4 of the internal bottom 19 borders with respect to the strips T3, however without prejudicing the formation of the same internal bottom and of the U-shaped band 21-22 that surrounds the internal pocket). These impressions T3â € ™ and T4â € ™ are defined only on the portions 12A of the first film and have no joining function but are the trace of the bag manufacturing process, as explained below.

Figures 6a, 6b and 6c show a working line L in which bags are made as now described (ie relative to figure 11).

In the preferred example, the procedure involves bringing four films unwound continuously, superimposed on each other, of preferably equal width, on a `` single-fold '' machine (not shown in the figures), i.e. a machine capable of transversely folding the films at 180 °, thus forming a grouping 27 of eight superimposed film portions, as shown in figures 6a, 6b and 6c (figure 6c, being a transverse view, shows a schematic diagram of the fold of the films).

In particular, in this example, four upper portions and four lower portions are formed (the lower and upper terms refer to the orientation on the drawing and have no limiting intent, although constituting a preferred arrangement in a real reference system) symmetrical with respect to the 180 ° bend plane, that is a plane passing through the center line of the grouping and parallel to these portions. Therefore there are two portions 12A of a first film 12, more external in the grouping (one higher and one lower, with reference to the drawings), or more external than the other components of the grouping with respect to the plane of symmetry of the grouping, and two assemblies 17 more internal to the grouping, i.e. more internal than the other components of the grouping with respect to the plane of symmetry of the grouping, each made up of three innermost portions 18A, 18B and 18C of second films 18â € ™, 18â € ™ â € ™, 18â € ™ â € ™ â € ™ made as in the description of the bags presented above.

More specifically, in this example, each assembly 17 has a respective portion of second film 18A that is more external than the other portions of second film more internal to the grouping, which is therefore close to the outermost portion of the grouping, i.e. a relative portion 12A of film 12. Again, each assembly presents a portion 18C of second film 18â € ™ â € ™ â € ™ more internal to the grouping, close to the symmetry plane of the grouping. Finally, each grouping has an intermediate portion 18B between the portions 18A and 18C.

There is therefore the movement along a working line of the portions of the symmetrical grouping 27 formed by the first continuous film 12 folded at 180 ° and constituting the two continuous film portions 12A outermost of the grouping and by three second continuous films 18â € ™, 18â € ™, 18â € ™ â € ™ â € ™ superimposed and folded at 180 ° to form two assemblies 17 of three continuous portions 18A, 18B, 18C of inner film of the grouping, with the widths transversal to the direction of movement f along the working line of said portions of the first film and of the portions of the second film which are approximately equal to each other.

Along this line, the following operations are foreseen, in sequence on the same part of the continuous development of the grouping 27:

- welding (sections T2) of the bottom 13 of the external pocket 11 which involves welding together all the portions of the first film 12 and the second films 18â € ™, 18â € ™ â € ™, 18â € ™ â € ™ , preferably at a longitudinal edge of the grouping (ie parallel to the direction of movement f);

- the interposition of non-stick means 28 between the external portions 12A of the first film 12 and the portions 18A of the second film 18 'immediately behind the first film 12, suitable for preventing the sealing of the first and second film portions and suitable for allowing the passage of heat for sealing the portions 18A, 18B, 18C of the second films together;

- the realization of a thermal action on the external faces 12Aâ € ™ of the portions 12A of the first film 12, to carry out the welding (strips T3, T3â € ™, T4, T4â € ™) of the portions 18A, 18B, 18C of the second film to form the bottom 19 and the two parallel sides 20, orthogonal to the bottom 19, of the internal pocket 15;

- the realization of a thermal action on the external faces 12Aâ € ™ of the portions 12A of the first film 12, to carry out the welding (strips T1) of the parallel sides 14 of the external pocket 11, orthogonal to the bottom 13 of the external pocket, which provides to weld together all the portions of the first film 12 and of the second films 18â € ™, 18â € ™ â € ™, 18â € ™ â € ™ â € ™.

Advantageously, the aforementioned non-stick means 28 comprise at least one Teflon sheet (or other equivalent material capable of avoiding the bonding to itself of a heat-sealable film if subjected to heat-sealing and pressed towards the non-stick film, as well as to be crossed by heat from heat sealing in a sufficiently rapid time and without excessive dispersion), marked in hatching in the figures.

Once the welds have been completed, the grouping 27 is cut transversely, forming a bag 10.

It goes without saying that the various welding phases indicated above can also be carried out in a different order from that indicated. For example, the welds relating to the internal pocket can be made first and then those relating to the bottom of the external pocket, or single welds of individual sides and / or bottoms can be made according to the most convenient order.

Preferably, the welding of the parallel sides of the external pocket 11 takes place with substantially linear thermal sources (ie which have a mainly linear development, to produce welding strips) of a length at least equal to the transversal length of the continuous longitudinal development of the grouping 27.

Conveniently, the welding of the bottom of the external pocket 11 provides for the realization of at least two welding sections T2 spaced apart by a section 26 without welding, in order to realize the communication passage 25 of the two chambers 16A 16B to be filled with ™ pressurized air.

A working line which carries out the above-indicated process provides for a multiplicity of stations arranged along the continuous development along f of the films of the grouping 27, in which to carry out the various welding and final cutting phases of the grouping.

For example, a first station provides a pair of first welding bars 29 arranged externally to the grouping, that is to look at the external faces 12Aâ € ™ at the grouping of the portions 12A of the first film 12, which create linear thermal sources (even one single sealing bar and contrast means arranged in the opposite position to the grouping). In the following, also for other pairs of sealing bars arranged in a similar way to the first ones, reference will be made only to one bar.

The first sealing bar 29 carries out the welding T2 of all the film portions of the grouping at the bottom 13 of the external pocket, or along the edge of the bag opposite the external opening 23. Conveniently, this first sealing bar has an interrupted part 29A which does not allow welding, to create the non-welded area 26 and allow the passage for air 25.

Downstream of the first station there are three further stations where the welds of the sides and bottom of the internal pocket are carried out. The non-stick means, ie the two Teflon sheets 28 mentioned above, act associated with these stations, with an area of width preferably equal to the width of the film portions of the grouping and a length preferably equal to the longitudinal dimensions of all three stations. It goes without saying that alternatively there may also be more than one sheet for three stations, for example one non-stick sheet for each station.

In particular, there is a second station which has a second sealing bar 30 which welds a first side 20 of the internal pocket 15 (this bar is therefore orthogonal, in this example, to the direction of feed f of the line and to the longitudinal development of the grouping). In this example the bar 30 has a length at least equal to the length of the side of the external pocket 11, that is, of the entire bag.

Similarly, downstream of the second station there is a third station with a third sealing bar 31 which welds the second side 20 of the internal pocket 15, substantially similar to the bar 30.

Downstream of the third station there is a fourth station with a fourth sealing bar 32 which welds the bottom 19 of the internal pocket 15 (this bar is therefore parallel, in this example, to the direction of advance f of the line and to the longitudinal section of the grouping). In this example, the bar 32 is longer than the distance between the sides 20 of the internal pocket 15, to ensure safety in closing the weld (it goes without saying that this bar can also be of a length equal to this distance).

The presence of Teflon sheets between the first film 12 and the second outermost film 18â € ™ of the grouping means that these films are not welded together but that the thermal action capable of heat sealing the films of the grouping is guaranteed. more internal than the first film, i.e. the films opposite the sealing bars with respect to the Teflon sheet, i.e. the portions of the second films of the two assemblies 17, which form the internal pocket 15.

This operating mode means that on the first film 12 which defines the external pocket some strips T3â € ™ and T4â € ™ are generated relating to the welding action of the second, third and fourth sealing bars.

Downstream of the fourth station there is a fifth station with a fifth sealing bar 33 which carries out the welding (strip T1) of the first external side 14 of the external pocket 11, simultaneously welding all the portions of the films of the grouping 27 (this bar is therefore orthogonal, in this example, to the direction of advance f of the line and to the longitudinal development of the grouping). Bar 33 has a length at least equal to the transverse width of the grouping.

Downstream of the fifth station there is a sixth station with a sixth sealing bar 34 which carries out the welding (strip T1) of the second external side 14 of the external pocket 11, simultaneously welding all the portions of the films of the grouping 27 (this bar is therefore orthogonal, in this example, to the direction of advance f of the line and to the longitudinal development of the grouping). Bar 33 has a length at least equal to the transverse width of the grouping.

Immediately downstream of this sixth station there is a seventh station in which there are cutting means 37 of the group thus welded, to separate from the continuous development of this, a bag 10.

Note how, in this example, the various stations are spaced apart substantially by a measure equal to the width k of a bag 10. This aspect is highlighted in figures 6a and 6b, in which the zones of the stations are delimited by vertical lines point-to-point common in both figures. From a procedural point of view, the advancement of the grouping of films can take place in "step", that is with the grouping advancing along f by a measure equal to k, and in which the grouping is stationary, for example for a necessary time to perform the slowest operation on the line.

Obviously, it is necessary that the various portions of the film to be welded together are in a compatible material. Therefore, as described above, in each assembly 17 of three portions of second film, a second internal film 18â € ™ â € ™ â € ™, that is, which looks towards the inside of the internal pocket 15, is made of polyethylene (PE ), a second central film 18â € ™ â € ™ is in an expanded plastic material of the open or closed cell type, in or based on polyethylene (PE), and a second external film 18â € ™, that is, which looks towards the external pocket 11, is made in three layers, with the two external 18xâ € ™ layers in polyethylene (PE) and the central 18yâ € ™ layer in polyacetylene (PA), possibly metallized. The first film 12 is preferably translucent or transparent and comprises polyethylene (PE) and more preferably it is a multilayer film formed by an outer layer of polyacetylene (PA) and an inner layer (that is, facing the inner pocket 11) of polyethylene ( PE).

Figures 13a, 13b and 13c show a variant procedure with respect to the one described above, and suitable for making a bag like the one described initially, or relative to figures 1 to 5.

This procedure is substantially similar to the one just described, with the substantial difference that the sealing of the portions of the second films which form the internal pocket 15 takes place by means of a thermal source which acts directly on the outermost film portions of the assemblies 17 and not also on the first film 12. In this way the use of non-stick sheets is avoided, but it is convenient to use spreader means between assemblies 17 and portions of the first film in such a way as to allow the introduction of the welding heat source.

In practice, the process provides that the welding steps of the various film portions comprise a thermal action carried out on the external face 12A of the portions 12A of the first film 12 outermost of the grouping 27 to form the closed perimeter of the external pocket 11, with the exception of the external opening 23, and a thermal action carried out on the external faces of the portions 18C of film 18â € ™ â € ™ â € ™ to create the closed perimeter of the internal pocket 15, with the exception of the internal opening 24.

Conveniently, this last thermal action, in order to form the perimeter of the internal pocket 15, provides for respective thermal sealing sources arranged between the portions 12A of the first film 12 and the portions 18A of the assembly 17 close to the portions 12A of the first film.

Conveniently, the heat source has a U-shape, in such a way as to make the T3 and T4 welds of the sides 20 and the bottom 19 of the internal pocket 15 in a single `` stroke ''. Between the same portions of film 12A and 18A are there are some spreading elements 35 suitable to keep the film portions 12A and 18A at a distance.

Therefore, as for the procedure described above, the portions of the grouping formed by the first continuous film 12 folded at 180 ° and constituting the two continuous portions 12A of film 12 outermost of the grouping 27 are moved along a working line L three second films 18â € ™, 18â € ™, 18â € ™ â € ™ â € ™ continuous, superimposed and folded at 180 ° to form two assemblies 17 of three continuous portions 18A, 18B, 18C of innermost films of the grouping. Also in this case the transverse widths to the direction of movement f along the working line of the portions 12A of the first film and of the portions 18A, 18B, 18C of the second films are approximately equal to each other.

Along the line of work, on the same part of the continuous development of the grouping,

- welding of the external bottom 13 (strip with sections T2) and of the parallel external sides 14 (strip T1) of the external pocket 11, which provides for welding together all the portions of film 12A, 18A, 18B, 18C of the grouping; this welding takes place with a thermal action carried out on the external face 12A 'of the outermost film portions 12A of the grouping;

- the interposition of spreader elements 35 designed to keep the portions 12A of the first film 12 at a distance, ie the most external to the grouping, and the portions 18A of film 18â € ™ inside the grouping and close to the portions 12A of the first film 12;

- the realization of a thermal action on the external faces of the portions 18A of the second film 18â € ™ or the outermost ones of the assembly 17, to carry out the welding of all the innermost portions 18A, 18B, 18C of the grouping, to forming the bottom 19 and the two parallel sides 20, orthogonal to the bottom, of the internal pocket 15; as said, this thermal action is carried out by means of a sealing thermal source with a preferred U shape arranged between the film portions 18A and 12A.

Also in this case, the order of the various stages of the procedure can be varied. Preferably, the welding of the parallel sides 14 of the external pocket 11 takes place after the welding of the bottom 13 of the same pocket 11 and after the welding of the perimeter of the internal pocket 15.

After the various welding phases, a cutting action is envisaged to separate a bag 10 from the continuous development of the grouping 27.

As in the previous case, a work line L which carries out the above-indicated process provides for a multiplicity of stations arranged along the continuous development along f of the films of the grouping 27, in which to carry out the various welding and final cutting phases of the grouping.

Also in this case, the various stations are spaced substantially by a measure equal to the width k of a bag 10. This aspect is highlighted in figures 13a and 13b, in which the zones of the stations are delimited by vertical point-to-point lines common in both figures. From a procedural point of view, the advancement of the grouping of films can take place in "step", that is with the grouping advancing along f by a measure equal to k, and in which the grouping is stationary, for example for a necessary time to perform the slowest operation on the line.

A first station provides a pair of first sealing bars 29 arranged externally to the grouping, that is to look at the faces external to the grouping of the portions 12A of the first film 12, which create linear thermal sources (even a single sealing bar and contrast media could be sufficient arranged opposite the grouping). In the following, also for other pairs of sealing bars arranged in a similar way to the first ones, reference will be made only to one bar.

The first sealing bar 29 carries out the welding T2 of all the film portions of the grouping at the bottom 13 of the external pocket, or along the edge of the bag opposite the external opening 23. Conveniently, this first sealing bar has an interrupted part 29A which does not allow welding, to create the non-welded area 26 and allow the passage for air 25.

In the same first station there are the two retractor elements 35 which keep the portion 12A of the first film 12 and the portion 18A of the second film 18â € ™ separate, ie that of the assembly 17 close to the first film 12.

Between these portions 12A and 18A a second U-shaped sealing bar 36 is inserted, which acts on the assembly 17, i.e. heat-sealing the portions of the assembly according to the U-shaped perimeter of the internal pocket 15, creating the T3 and T4 welding of the internal sides 20 and internal bottom 19. Obviously, instead of a U-shaped bar, there may be three bars arranged in a U-shaped configuration.

Downstream of this first station, for example spaced from this by two `` steps '' equal to the width k of the bag 10, there is a second station in which there is a third linear sealing bar 38, with a length at least equal to the width transversal of the grouping 27, which carries out a pre-welding of each external side of the external pocket 11.

As regards the second station, there is a third station in which there is a fourth linear sealing bar 39, with a length at least equal to the transversal width of the grouping 27, which completes the welding of each external side of the external pocket 11.

For the third station there is a fourth station in which there is a cooling bar 40, of a length at least equal to the transversal width of the grouping 27, which cools the weld of each external side of the external pocket 11.

Pre-welding, welding and cooling of the sides of the external pocket allow you to optimize processing times.

Finally, there is a sixth station, with transversal cutting means 37 of the grouping to separate a bag 10.

In the examples described, reference has been made to a plurality of second films folded by 180 ° to form film portions in two specular assemblies 17 of film portions 17, i.e. for each second film there are two film portions, specular with respect to the center plane of the grouping. It goes without saying that in other embodiments, it is possible to use second unfolded films and therefore each second film constitutes a portion of the film of the grouping, as shown for example in Figure 7, in which the first film 12 is folded to form two 12A portions and second film portions consist of entire second films indicated with 118â € ™, 118â € ™ â € ™, 118â € ™ â € ™ â € ™ and 218, 218â € ™, 218â € ™ â € ™ â € ™, which form two assemblies 117 and 217. Obviously it is also possible (see figure 8) in which there is not a single first film, but there are two first films that form the outermost film portions of the grouping, these films are indicated by 112 and 212. Obviously other combinations are also possible, in which some second films are folded by 180 ° to form two portions, and other second films are unfolded. Therefore, the expressions `` two portions of at least one first film '' and `` two portions of at least a second film '' must be understood according to the possible combinations now presented, i.e. two portions may be part of a single film or two portions may constitute or be part of their respective films.

The invention also relates to a package C made with a bag as previously described and subsequently claimed, in which a product P is housed in the internal pocket 15 and is â € œvacuum packedâ €, while in the interspace 16A-16B, or in the external pocket 11, there is air under pressure higher than atmospheric pressure, which inflates the external pocket itself and in which a T5 weld is made along the edge of the external pocket 15 and which includes the flaps of the external opening 23 and of the internal opening 24 of the two pockets, sealing them.

It is understood that what has been illustrated represents only possible non-limiting embodiments of the invention, which may vary in forms and arrangements without departing from the scope of the concept underlying the invention. The possible presence of reference numbers in the attached claims has the sole purpose of facilitating their reading in the light of the above description and the attached drawings and does not in any way limit the scope of protection.

Claims (20)

â € œSHOCK BAG FOR PRODUCTS TO BE PROTECTED, OF THE TYPE DEED TO BE FILLED WITH AIR AND PROCEDURE FOR REA-LIZING SAID BAGâ € CLAIMS 1) Shockproof bag to protect products, of the type intended to be filled with air, comprising an external pocket (11) and a pocket (15) inside said external pocket (11) intended to accommodate the product (P) to be protected , the space between said pockets defining an interspace (16A, 16B) which, during the use of the bag, is able to contain pressurized air to protect the contents of the internal pocket (15), called external pocket (11 ) being formed by two portions (12A) of at least one first film (12) facing and joined along the bottom of the external pocket (11), called external bottom (13), and two opposite sides of said external pocket (11), called external sides (14), said internal pocket (15) being formed by at least two portions (18A, 18B, 18C) of at least one second film (18â € ™, 18â € ™ â € ™, 18â € ™ â € ™ â € ™) facing and joined together and joined to said external pocket (11) at least in correspondence with said external sides (14) of said external pocket (11), said internal pocket (15) presenting a respective bottom, called internal bottom (19), and opposite sides, called internal sides (20), which develop from said internal bottom (19), there being two opposite bands (21) of said at least one second film (18â € ™, 18â € ™ â € ™, 18â € ™ â € ™ â € ™) bounded by said external sides (14) of said external pocket (11) and by said internal sides (20) of said internal pocket (15) , said external pocket (11) and said internal pocket (15) having respective openings (23, 24) respectively for the insufflation of air into the interspace (16A, 16B) defined between the two said pockets (23, 24) and for the introduction of the product to be protected into the bag. 2) Sack according to claim 1, in which said portions (18A, 18B, 18C) of at least one second film (18 ', 18', 18 ') are also joined to said external bottom (13) of said external pocket (11), defining a further band (22) comprised between said external bottom (13) and said internal bottom (19) of said internal pocket (15), between said internal pocket (15) ) and the external sides and bottom (13, 14) of said external pocket (11) there being therefore a U-shaped band formed by said second film portions which connects the walls of the internal pocket and the walls of the external pocket. 3) Sack according to claim 1 or 2, in which said gap is defined by two chambers (16A, 16B) separated by said at least one second film (18â € ™, 18â € ™ â € ™, 18â € ™ â € ™ â € ™); preferably said chambers (16A, 16B) having a fluid communication passage (25); preferably said passage (25) being made in proximity of said external bottom (13). 4) Bag according to one or more of the preceding claims, in which the openings (23, 24) of the two external (11) and internal (15) pockets are made on the respective pocket sides opposite the respective bottoms (13, 19). 5) Bag according to one or more of the preceding claims, in which said two portions (12A) of said at least one first film (12) are formed by a single first film (12) folded at 180 °; in the folding area (13A) of said first film (12) a heat sealing (T2) is made to join said at least one second film (18â € ™, 18â € ™ â € ™, 18â € ™ â € ™ â € ™ ) and said only first film (12); preferably, said heat-sealing (T2) presenting at least one interruption capable of defining at least one non-welded area (26) which constitutes said passage (25) for fluid communication between said two chambers (16A, 16B) of the interspace. 6) Bag according to one or more of the preceding claims, in which said internal pocket (15) is formed by two assemblies (17) each consisting of at least three portions (18A, 18B, 18C) of second films (18â € ™, 18â € ™ â € ™, 18â € ™ â € ™ â € ™) overlapping each other and joined along the perimeter of the external pocket (11) and of the internal pocket (15); preferably said internal pocket (15) comprising heat-insulating material. 7) Bag according to claim 6, in which each said assembly (17) is formed by three portions (18A, 18B, 18C) of second films (18 ', 18', 18 ' â € ™) superimposed on each other and in which the central portion (18B) of said assembly (17) comprises an expanded plastic material of the open or closed cell type. 8) Bag according to claim 7, wherein said first film (12) which forms said outer pocket (11) comprises an outer layer of polyacetylene (PA) and an inner layer of polyethylene (PE), while in said assembly (17) of three portions (18A, 18B, 18C) of second films (18â € ™, 18â € ™, 18â € ™ â € ™ â € ™), a second internal film (18â € ™ â € ™ ), that is, which looks towards the inside of the internal pocket (15), is in polyethylene (PE), a second central film (18â € ™ â € ™) is in an expanded plastic material of the open cell type or closed, and a said second external film (18â € ™), that is, which looks towards the external pocket (11), is made in at least three layers (18xâ € ™, 18y, 18xâ € ™), with the two external layers ( 18xâ € ™) in polyethylene (PE) and the central layer (18yâ € ™) in polyacetylene (PA) possibly metallized. 9) Process for making shockproof bags for the protection of products, of the type comprising an external pocket (11) to be filled with pressurized air and an internal pocket (15) to the external pocket (11) in which to place the product (P ), said process comprising the - the formation of a grouping (27) by overlapping each other of at least four film portions (12A, 18A, 18B, 18C, 18C, 18B, 18A, 12A), respectively at least two outer portions (12A, 12A) and at least two portions (18A, 18B, 18C, 18C, 18B, 18A) inside the superimposed grouping (27), - the welding of said at least two innermost portions of film (18A, 18B, 18C, 18A, 18B, 18C) to said superimposed grouping (27), creating a pocket, called internal pocket (15), equipped with an opening, called internal opening (24), said internal opening (24) being made for a subsequent reception of the product to be protected e - the welding of said at least two portions (12A, 12A) of films more external to said superimposed grouping (27), creating a further pocket, called external pocket (11), which contains said internal pocket (15) and which defines the part external of said bag, also equipped with an opening, called external opening (23), in such a way as to create at least an interspace (26A, 26B) between said internal and external pockets open for the subsequent insertion of the bag swelling air. 10) Process according to claim 9, wherein said grouping (27) of at least four portions (12A, 18A, 18B, 18C, 18C, 18B, 18A, 12A) of superimposed films develops continuously along a processing line . 11) Process according to one or more of the preceding claims, in which the at least two outermost film portions (12A, 12A) of the superimposed grouping (27) are equal and symmetrically arranged with respect to a plane substantially parallel to them and passing through the center line of the grouping (27), or arranged between the at least two portions of more internal films (18A, 18B, 18C, 18C, 18B, 18A), and / or the portions (18A, 18B, 18C, 18C, 18B, 18A) of films innermost of the grouping (27) are the same and arranged symmetrically with respect to a plane substantially parallel to them and passing through the center line of the superimposed grouping (27). 12) Process according to one or more of the preceding claims, wherein said overlap between them of at least four portions (12A, 18A, 18B, 18C, 18C, 18B, 18A, 12A) or of film being made by folding 180 ° of at least two overlapping films (12, 18â € ™, 18â € ™ â € ™, 18â € ™ â € ™ â € ™), for which said at least two outermost film portions (12A, 12A) of the grouping (27) are part of at least one same folded film (12) and similarly called at least two portions of films (18A, 18B, 18C, 18C, 18B, 18A) more internal than group 27) are part of at least one same folded film (18â € ™, 18â € ™ â € ™, 18â € ™ â € ™). 13) Process according to claim 12, wherein there is a single folded film (12) to form the two outermost film portions (12A) of said grouping (27). 14) Process according to claim 12 or 13, in which there are at least two superimposed films (18 ', 18', 18 ', 18', 18 ', 18â € ™ â € ™, 18â € ™) and folded to form two assemblies (17, 17) of at least two portions of film (18A, 18B, 18C, 18C, 18B, 18A) inside the grouping (27). 15) Process according to one or more of the preceding claims, in which the welding phases of the various portions of the film take place by means of a thermal action which acts on the external face (12Aâ € ™, 12Aâ € ™) of at least one of the portions of films (12A, 12A) outermost of said grouping (27). 16) Process according to one or more of the preceding claims, in which the welding of said internal pocket (15) takes place by means of a thermal action which acts on the external face of at least one of the outermost film portions (12A, 12A) of said grouping (27) and with the interposition of non-stick media (28) between the outermost film portions (12A, 12A) and the innermost film portions (18A, 18A) close to said more external (12A, 12A), suitable for preventing the sealing between internal film portions (18A, 18A) close to said outermost film portions (12A, 12A) and the same outermost portions (12A, 12A) of the grouping ( 27), and suitable for allowing the passage of heat for the welding of said innermost film portions (18A, 18B, 18C, 18C, 18B, 18A) to each other; preferably said non-stick means (28) being Teflon sheets. 17) Process according to claim 16, which provides for the movement along a working line (L) of the portions of superimposed films (12A, 18A, 18B, 18C, 18C, 18B, 18A, 12A), along said line being provided, in sequence on the same part of the continuous development of the grouping (27), - welding the bottom (13) of said external pocket (11) which provides for welding together all the portions of film (12A, 18A, 18B, 18C, 18C, 18B, 18A, 12A) of the grouping (27), - the interposition of said non-stick means (28) between the outermost film portions (12A, 12A) and the innermost film portions (18A, 18A) close to the outermost film portions (12A, 12A), - the realization of a thermal action on the external face (12Aâ € ™) of at least one of the outermost film portions (12A, 12A) of said grouping (27), to carry out the sealing of the innermost film portions (18A , 18B, 18C, 18C, 18B, 18A), to form the bottom (19) and the two sides (20) of the internal pocket (15), - the realization of a thermal action on the external face (12Aâ € ™) of at least one of the outermost film portions (12A, 12A) of said grouping, to carry out the welding of two opposite sides of said external pocket (14) , which provides for welding together all the internal and external film portions (12A, 18A, 18B, 18C, 18C, 18B, 18A, 12A) of the grouping (27). 18) Process according to one or more of the preceding claims, which provides for the movement along a working line (L) of the portions of said grouping (27) formed by a first continuous film (12) folded at 180 ° and constituting the two continuous portions (12A) of outermost films and at least two, preferably three, second films (18â € ™, 18â € ™ â € ™, 18â € ™ â € ™ â € ™) continuous overlapping and folded at 180 ° to form two assemblies (17, 17) of at least two, preferably three, continuous portions (18A, 18B, 18C, 18C, 18B, 18A) of films innermost in the grouping; preferably the widths transversal to the direction of movement (f) along said working line of said portions of the first film and of the portions of the second film being approximately equal to each other; along said line being provided, in sequence on the same part of the continuous development of the grouping, - welding of the bottom (13) of said external pocket (11) which provides for welding together all the portions of the first and second films (12A, 18A, 18B, 18C, 18C, 18B, 18A, 12A) of the grouping (27 ), preferably at a longitudinal edge of said grouping, - the interposition of non-stick media (28) between the external portions (12A, 12A) of the first film (12) and the portions (18A, 18A) of the second film (18â € ™) close to the first film (12) , suitable for preventing the sealing of said portions of the first and second films and suitable for allowing the passage of heat for the subsequent sealing of the portions of the second films (18A, 18B, 18C, 18C, 18B, 18A) of the grouping (27), - the realization of a thermal action on the external face (12Aâ € ™) of a portion (12A) of said first film (12), to carry out the welding of the portions (18A, 18B, 18C, 18C, 18B, 18A) of the second films (18â € ™, 18â € ™, 18â € ™ â € ™ â € ™) to form the bottom (19) and the two opposite sides (20) of the inner pocket (15), - the realization of a thermal action on the external face (12Aâ € ™) of a portion (12A) of said first film (12), to realize the welding of two opposite sides (14) of said external pocket (11), which involves welding together all the portions of film (12A, 18A, 18B, 18C, 18C, 18B, 18A, 12A) of the grouping (27). 19) Process according to one or more of claims 9 to 15, in which the welding steps of the various portions of film (12A, 18A, 18B, 18C, 18C, 18B, 18A, 12A) of the grouping (27) provide for a Thermal action carried out on the external face (12Aâ € ™, 12Aâ € ™) of at least one of the outermost film portions (12A, 12A) of said grouping (27) to create the closed perimeter of said external pocket (11), to less than said external opening (23), and a thermal action carried out on the outermost face of at least one of the portions (18A, 18A) of the innermost film (18A, 18B, 18C, 18C, 18B, 18A) to make the closed perimeter of said internal pocket (15) except said internal opening (24); preferably said thermal action carried out on the outermost face of at least one of the portions (18A, 18A) of innermost films (18A, 18B, 18C, 18C, 18B, 18A) to form the closed perimeter of said internal pocket (15), providing at least one heat sealing source arranged between at least one of the outermost film portions (12A, 12A) and at least one innermost film portion (18A, 18A) close to said at least one of the outermost film portions (12A, 12A) ; preferably said heat source having a U shape; preferably there being some spreading elements (35) suitable for keeping spaced said at least one of the outermost film portions (12A, 12A) and the innermost film portion close to said at least one of the outermost film portions. 20) Process according to one or more of the preceding claims, in which said grouping (27) develops continuously along a working line, said process comprising, after the welding steps for making the internal (15) and external (11) pockets , a transversal cutting step of said welded grouping to form single shockproof bags (10).