FOOD PACKAGING

Description

DESCRIPTION of the industrial invention entitled: “Food packaging” By: SOREMARTEC SA, Luxembourg nationality, 16 Route de Trèves, Senningerberg 2633, Luxembourg Designated Inventors: STINCHELLI Carola, SANNAZZARO Roberto, Avogadro Paola Filed on: July 17, 2024 *** DESCRIPTION The present invention relates to a con- processing, particularly for food products, of the type comprising a first and a second half-shell shaped like a cap, with a respective circumferential flange according to the mouth profile, in which at least one of the half-shells, preferably both half-shells, is closed by a sealing foil to confine the a food product and / or an accessory inside it or article of entertainment. EP 919488 B1 describes a package of the type above mentioned, formed by two half-shells of material thermoformable plastic, suitable for contact with food ments, with a respective sealing foil, al- moreover made of plastic material. The purpose of the present invention is to provide a package of the type mentioned above which is compostable and / or biodegradable and / or recyclable and designed to provide adequate sealing characteristics hermetic sealing of the food products contained in the packaging, obtaining a shelf-life of the product packaged corresponding to that of products in conventional plastic packaging. Another object achieved by the invention is to provide a package that presents on the external surface of the half-shells a printed pattern which, following the formation of the half-shells, is de- forms only to a minimal extent unlike what occurs following thermoforming with the conven- national half-shells of plastic material Summary of the invention These goals are achieved thanks to a con- defect, as defined in the claims that se- guono, which constitute an integral and integral part of this description. In particular, the main feature of the invention consists in the fact that both se- shells, as well as their respective sealing plates- are mainly made of paper material, and that is, with a cellulose fibre content such as where the packaging is recyclable in paper according to the test methods recognized in the specific sector (e.g. CEPI method, Paper based Recyclability Guidelines...). Additional features and benefits of the pre- hear invention, will be evident from the description detailed information that follows, provided with reference to the drawings and examples that follow which are not to be understood as limiting. Brief description of the drawings In the attached drawings: - figure 1 is a general perspective view exploded view of a package of the type in question feels invention, as illustrated in the technique note from EP 919488 B1; - Figure 2 is a sectional view of a semi- shell containing a food product with its relative sealing foil; - figures 3(a), (b) and (c) are sectional views which illustrate exemplary variants of the structure layered sealing foil, preferably likely associated with the half-shell containing the pro- alimentary duct; - Figure 4 is a sectional view of a semi- containing a toy object with the relative sealing foil; - Figures 5(a) and (b) are sectional views that illustrate two exemplary variants of the layered structure of the sealing foil, pre- preferably associated with the half-shell of figure 4 with holding the toy object; - Figure 6 is an exploded sectional view of the packaging; - Figure 6A is a schematic representation of possible distribution patterns of the sal- reliable with ultrasound; - figure 7 (a), (b) and (c) illustrate the half-shells equipped with a sealing foil even if only partially initially peelable from the respective flange, - Figure 8 illustrates an exemplary multilayer structure pliant for the sheet of paper material, for- keep the half-shells, and - figure 9 is a perspective view, partially exploded, of a package according to the invention with associated with a picking or spreading tool. Figures 3, 5 and 8 illustrate structures multilayer with indication of the nature of the materials materials preferably used for such layers and of their alternation. These indications are to be in- to be intended as purely exemplary, although favorites; the general fields of numeric values ​​of the above mentioned features and alternative materials are reported in the following description with reference to the layers cited. Detailed description of the invention In the implementation example of figure 1, the con- section 1 comprises two susceptible half-shells 2 and 3 to receive within them, respectively, a edible food mass 4 and an accessory 5, which for example a toy object, intended to function to be “surprise”. Both half-shells are provided seen, corresponding to the respective parts of mouth of flanged edges or 2', 3' flanges which allow- tone to apply, to close the half-shells 2 and 3 after the filling of the same, corresponding sheets of sealing 6 and 7. However, it falls within the scope of the invention, the case in which a syn- throat sealing plate, 6, associated with the semigu- bowl containing the food mass. The two half-shells, filled and closed, are then connected to each other in a condition of matching frontal chin, for example through an action of fixing made in correspondence with the parts peripherals of the sealing plates 6 and 7 which are extend at flanges 2' and 3'. Following the connection of the two half-shells, the package features a substantially different configuration ovoid mind; however, it is understood that this configuration is not binding, being naturally other configurations are possible, such as for example a heart configuration. Preferably, at least one of sealing plates 6 and 7, or both of them laminae, presents an appendicular formation, or lin- guetta 60 or 70 respectively, superimposable to a corresponding appendicular formation 20 or resp. 30 of the respective half-shell, for ease- wait until the package is opened. According to a feature of the invention, the the aforementioned sealing foil consists of a laminate comprising at least one main layer paper, a heat-sealed material coating bile, applied as a surface coating on the face of the plate facing the respective se- shell, such as a polyethylene film or high density polyethylene, and a thermal coating weldable or ultrasonic weldable, applied as surface coating on the face of the foil facing the other half-shell, with the possible in- interposition between the main paper layer and the heat-sealable or ultrasonically weldable coating of intermediate layers, such as, for example, a layer of primer. Within the scope of the present invention, use primer layers, preferably na- organic, natural, applied to the car- taceous, having the function of reducing the porosity of the paper, facilitate the application of subsequent layers and facilitate recyclability. The reference to the paper layer as a layer principal is to be understood as referring to the fact that the latter is the layer with the highest weight of the laminate which contributes to the weight of the laminate born for at least 50% by weight, preferably in measure equal to at least 70% and preferentially 80 to 85% by weight. Figure 3(a), (b) and (c) illustrate three structures multilayer preferred examples for the foil of sealing 6 intended to be applied to the half-shell 2 for the confinement of the food product tare. This sealing foil must achieve ca- barrier characteristics, particularly to humi- resistance to humidity and / or oxygen, hermetic characteristics following its welding to the corresponding se- shell, as well as peelability characteristics for the opening of this part of the container. Furthermore, it is preferable that this sheet is weldable at ul- transsounds to the sealing plate of the other half- shell. In the exemplary and pre-implementation forms wounds of figure 3, the sealing foil 6 com- takes: - a surface coating 62 obtained by application of an ultrasonic weldable lacquer, applied with different spreading patterns, depending on the desired recyclability characteristics installments, for example with 100%, 50%, 25% coverage or values of coverage between these intermediates. The solderable lacquer ultrasonic, common to the three forms of implementation of figure 3, can for example be deposited by applying a mixture of water and / or solvent, resin or components polymeric, mainly ethylene vinyl acetate acetate (EVA); the solderable lacquer coating is typically applied at a weight of 3-4 g / m ; - a coating layer 64, underneath the ri- dressing 62, having a primer function, finalized to reduce the absorption of the lacquer coating 62 in the underlying paper layer, improve the ca- peelability and recycling characteristics of the foil material class. The use of the coating layer or primer 64 is preferred, but not binding. It is preferable mind formed from biological substances (“biobased”), preferably polysaccharides and can be obtained applying, for example, a mixture of polysaccharides and water; the weight of the primer layer is of the order of about 2 g / m; - a main paper layer, indicated by 66, in figures 3(b) and (c) and with 66a in figure 3(a). The term paper layer refers to a layer formed by a material comprising or constituting made essentially of cellulose fibres; the mate- The product may include any additives of the type conventionally used in the production of paper or cardboard; the material may also include any additives functional to achieve effects barrier to gas and liquids. This layer can typically have a gramma- ture from 80 to 110 - 120 g / m . In the embodiment of figure 3(a) the paper layer, indicated with 66a, is a layer of paper with intrinsic barrier properties, in particular to water vapor, which makes coatings unnecessary. special ments or additional laminations. In Figure 3(b) and (c), the paper layer 66 is a conventional paper layer, e.g. with gram- preferred ripeness of 90 g / meter. 68 indicates a surface coating, preferably consisting of a film applied to lamination, on the face of the sheet facing the half-shell to which it is associated, designed to allow the holding of a weld preferably of the type thermal, with the flange of the half-shell to which the foil of sealing is applied and with characteristics of peelability. For example, this surface layer can be consisting of a polyethylene or polyethylene film high density, for example with a thickness of 6 to 10 microns, preferably about 8 microns. In the embodiments of Figure 3(b) and (c), with 70(b) and 70(c), respectively, one is indicated lamination layer with moisture barrier properties dity, for example polypropylene, or polyethylene, which can be transparent or optionally metallized, for example with a thickness of 8 to 12 microns, prefe- approximately 8 microns thick. The aforementioned layers 70(b) and 70(c) are not present in the figure structure 3(a), since layer 66(a), is a paper layer with intrinsic barrier properties. In figure 2, the reference number 100 is used to indicate the pre-weld region probably of thermal welding, between the foil of sealing 6 and flange 2' of half-shell 2. With 102 is the welding region, preferably ultrasound, which is done for connect the two parts of the package, along a peripheral annular region of the sealing plate tour 6. Figure 4 shows, in section, the half-shell 3 intended to contain an accessory 5, with the re- 7 sealing foil which is welded, along the annular region 100, at flange 3' of the half-shell 3. The sealing foil 7 can have the same layered structure, previously described for the foil 6. However, when the sealing foil layer 7 is associated with a half-shell containing no a food product, it does not require charac- barrier characteristics; however, it also requires charac- peelability characteristics for its detachment from the se- miguscio which is associated and preferably characterized ultrasonic weldability characteristics, to allow the fixing of a tool on its external surface sampling or spreading sile (spatula) 112, of paper material, by ultrasonic welding, as illustrated in figure 9. An example of a weldable spreading tool Ultrasonic sealing foil is described in EP 3838796 of the Applicant, together with its ultrasonic welding technology. Ultrasonic welding ultrasound is performed along a longitudinal line axial 114, continuous or intermittent, of the tool, per- putting to obtain the adhesion of the ma- tool paper material with foil, without the application of a sticker. The sealing foil 7 can be made of from a laminate, whose stratified structure prefers rita is illustrated in figures 5(a) and 5(b). In the embodiment of Figure 5(a), the multilayer structure of the sealing foil comprises: a main paper layer 76, having characteristics corresponding to the paper layer 66 of figure 3, and preferably a com- grip between 80 g / m2 and 100 g / m2; a thin film 71 made of plastic material, preferably polypropylene bioriented lene, with a thickness of the order of 8 at 12 microns, for example 8 microns, laminated on the fac- paper layer 76 facing upwards half-shell; the use of polypropylene for the film 71 It is preferred for both ultrasonic welding purposes of the above-mentioned material spreading tool I am silent on the outside of the film, both for the purposes of mutual connection of the two parts of the confe- tion, as described below. The structure of figure 5(a) also includes a heat-sealable plastic coating 79, such as a lacquer applied to the face of the layer paper 76 facing the inside of the half-shell, for example with a weight of approximately 4 g / m. Layer 79 can be obtained from any lacquer which, in addition to making layer 79 heat-sealable, allows that, following the welding of the sheet to the flange of the respective half-shell, this plate is peelable. Layer 79 is preferably obtained from a lacquer comprising polyolefins in a solvent (orga- (aqueous or aqueous), particularly a mixture of po- polypropylene and polypropylene, preferably with pre- valence of polypropylene, or comprising poly ethylenevinyl acetate (EVA) in the above solvent. In the embodiment of Figure 5(b), the multilayer structure includes a paper layer 76, as previously described, a coating heat sealable 78 made of a polyolefin film, preferably made of polyethylene or high-density polyethylene density with thickness preferably from 6 to 12 microns, more preferably about 6 or 8 microns, applied for lamination on the facing side of the sheet towards the half-shell with which it is associated and which allows obtain following thermal welding to the semi- shell, a peelable connection. The actual form The position of figure 5(b) also differs from that of figure 5(a) due to the fact that the surface layer present on the face of the plate facing upwards the half-shell, is made up of a 72-layer coating (for example with a weight of approximately 4 g / m), obtained from an ultrasonic weldable lacquer and a sub- given primer coating 74, having the characteristics previously described for figure 3. Half-shells 2 and 3 are both made of a shaped sheet of paper material. Particularly the half-shell which, in the example, it is indicated with 2, intended to contain the product food can be made from a composite sheet multilayer comprising: - at least one layer of 80 paper, preferably two layers of paper 80a, 80b; - a surface coating 86, present on the face of the half-shell facing the respective la- sealing lead, heat-sealable and / or solderable ultrasound, with moisture barrier properties and / or to oxygen or fats, and - an external protective coating layer 84, preferably applied on a layer made of printing inks 82 in turn applied to a face of the paper layer. This multilayer sheet has characteristics of formability, the aforementioned barrier properties to oxygen and / or humidity or fats, characteri- weldability characteristics, as well as the suitability to receive printing inks for obtaining a super- external surface of the half-shell, featuring a graphic printed. The other half-shell may have similar characteristics. stiche, however, in the case where such half-shell 3 does not contain food products, but rather an accessory rio, it is not necessary to achieve barrier properties. The recyclability qualities are achieved thanks to the prevalent presence of cellulose fibres which constitute they cover the paper layer, which is the main layer principal, with greater weight, in the previous sense fearfully indicated. The sheet preferably presents character- extensibility features to allow for their drawing ture, in particular, an extensibility from 3% to 15%, determined according to the ISO 1924-3 standard. Such half-shells can be obtained by a drawing process, such as the type described in WO 2023 / 119121 on behalf of the Applicant. This process allows you to obtain a surface annular ring of flanges 2' and 3', with a presence controlled and limited wrinkles, thus allowing a hermetic welding of the respective silicon sheet sealing. By way of non-limiting example, the layer paper can be made of a thermoformed sheet mabile, commercially available as Fibreform® op- tionally patinated. It has been found and this constitutes a rele- advantage provided by the invention, which the for- ripening of the papery half-shells with the use of a sheet with an outer coating with a pattern printed, substantially reduces the deformation of the reason with respect to the deformation caused by the ter- moulding of a sheet of corrugated plastic material appropriately printed. Figure 8 illustrates exemplary multilayer structures. plificative, of the sheet, intended to be shaped to form the half-shells. These structures include at least one main paper layer 80, or two or more paper layers, for example 80a and 80b (figure 8(a)). In the case of using a single layer of paper, The weight is typically 115 to 200, for example of approximately 165 g / m . In the case of using two or more paper layers, the total weight of these layers is from 200 to 400, for example a first layer of 150 g / m and a second 165 g / m layer. Preferably at least one or both layers paper ones are made of coated paper. The multilayer structure also includes a surface layer 86, applied to the surface of the half-shell, facing the respective sheet of sealing; this layer can be for example for- made of a polyolefin film, preferably of po- high or medium density, applied for lamination, with a thickness of 10 to 60 microns. Particularly in the case of half-shell 2, which is refers to the structure depicted in figure 8(a), the the above surface film is preferably formed from high density polyethylene, preferably with a thickness of approximately 40 microns. In the case of half-shell 3, which is preferably apply the structure of figure 8(b), the super-layer 86, is preferably made of a film of medium density polyethylene, preferably with thickness of approximately 14 microns. Following the forming of the sheet in the form of half-shell, with relative radial flange, the presence of the aforementioned film 86 on the flange, allows to obtain keep a tight, but peelable, seal to the la- sealing mine; furthermore, the presence of such a film in the concave part of the half-shell it achieves properties barrier to moisture and / or oxygen or grease. An additional layer of coating with pro- fat barrier properties (not shown), prefer- obtained from an aqueous dispersion of po- acid-modified olefins, can optionally be be present between the paper layer 80 and / or 80b and the surface layer 86. The multilayer structure also includes a re- clothing 82, made of printing inks, ti- typically for rotogravure printing, which is deposited on the face, preferably patinated, of the layer 80a or 80 paper, typically with a weight of approximately 2 g / m . The coating of 82 inks, which forms a continuous or superimposed printed pattern surface, is preferably covered with a coating 84 made of a protective varnish. The protective varnish The roofing can be any commercial paint, comprising a mixture of resins and solvent, provided that applied with a final weight that does not affect the eco-sustainability characteristics of the packaging, for example with a weight of 3 g / m . A for example, the protective paint can be a polyester-based paint (preferably PET), optionally including slip agents. Figure 6 illustrates, in section, the structure exploded view of the package, made up of the two half-shells 2 and 3 and the respective sealing plates 6 and 7. As already indicated, the sealing foil 6, may have one of the structures shown in figure 3; the distribution pattern of the surface lacquer ultrasonic weldable, indicated as an example bad in figure 6A, can allow different scenarios 108 weld sealing along the annular region of flange 2', whether it is thermal or ul- transsounds, also expanding the evaluation parameters of the recyclability of the material. The sealing foil 7 has preferably a multilayered structure as shown in fig. figure 5. In the case of using a structure such as that illustrated in figure 5(a), the welding between the foil and the respective half-shell, indicated schematically- tico with 106 in figure 6, can be of pure nature- thermal or ultrasonic mind. The two parts of the package are fixed to each other to the other, by means of a weld made along the peripheral annular region of the respective laminae of sealing, indicated schematically and overall- mind with 110 in figure 6 and with 110a and 110b in figure 9; such welding is preferably a ultrasound. Ultrasonic welding along annular regions can be carried out by means of a sonotrode, having an annular contact surface, as described in EP 919488. Preferably, still in accordance with the solution described in EP 919488, in case the half-shells present, respective appendi- formations 20 and 30 colars and the sealing plates present also appendicular formations 60 and 70 overlapping bili to the appendicular formations of the half-shells; two half-shells are connected to each other by means of welding of the respective sealing sheets, along the annular regions of these sheets 110a and 110b, superimposed on the flanges of the half-shells, with the exception of welding in correspondence with said formations appendicular. In one embodiment of the invention, the- illustrated in figure 7(a), (b) and (c) the silica foil sealing 6 and / or 7 of the first and / or second half-shell it is connected to the flange of the respective half-shell with a weld whose bond strength to that flange, in a first portion of the surface of the flange, which is generally on the opposite side to the to the appendicular formation, if adopted, is greater than the adhesion force to the remaining por- tion of the flange surface, so that which the minimum force, exerted to allow the detachment of the lamina from the said remaining portion, not generates the detachment of the lamina from the said first por- tion. This solution means that with the opening of the packaging, by the consumer, for consumption of the food product or for the extraction of the water accessory, the sealing foil generally remains connected to a portion of the flange surface yes, avoiding dispersion into the environment. The welding region with adhesion strength The largest is indicated in figure 7 with the numbers of re- wounding 90a and 90b. In one embodiment, the greater bond strength can be achieved by greater heat transmission applied in the field of thermal welding, to the region of surface 90a or 90b; alternatively, such greater adhesion strength, can be obtained with a modi- fig of an ultrasonic welding area, intervening on the application profile of the lacquer ultrasonic weldable.

Claims

1. Packaging for products, such as food products, comprising a first (2) and a second (3) half-shell shaped like a cap with a respective flange (2, 3) surrounding the mouth profile and connected to each other at the respective flanges, at least one of said half-shells being closed by a respective sealing foil (6, 7); said first (2) and second (3) half-shells and said respective sealing foil (6, 7) being optionally provided with respective appendicular formations (20, 30) for opening the package located in correspondence with said flanges, characterised in that: said first (2) and second (3) half-shells are both formed from a shaped sheet of paper material, said at least one sealing foil (6, 7) is made up of a laminate comprising at least one main paper layer (66; 66a; 76), a heat-sealable surface coating (68; 78;79) applied on the face of the foil facing the respective half-shell, and a heat-sealable or ultrasonically weldable surface coating (62;71), applied on the face of the foil facing the other half-shell.; 2. Packaging according to claim 1, characterised in that said surface coating (68;78) applied on the face of the foil facing the respective half-shell comprises a laminated film of polyethylene or high density polyethylene.

3. Packaging according to claim 1, characterised in that said surface coating (79) applied on the face of the foil facing the respective half-shell is obtained by applying a heat-seal lacquer.

4. Packaging according to claims 1 or 2, characterised in that said surface coating (62) present on the face of the sealing foil facing the other half-shell, is obtained by applying an ultrasonically sealable lacquer comprising a mixture of ethylene vinyl acetate and a solvent or water.

5. Packaging according to claim 4, characterised in that said sealing foil comprises a primer layer (64), comprising natural biological substances, in particular a mixture of water and polysaccharides, interposed between said ultrasonically sealable lacquer coating (62) and said at least one main paper layer (66).

6. Packaging according to claim 3, characterised in that said surface coating (71) present on the face of the sealing foil facing the other half-shell is made of a laminated polypropylene film.

7. Packaging according to any of claims 1 to 6 characterised in that the shaped sheet forming said half-shells is a multi-layer composite extensible sheet comprising: - at least one layer of paper (80; 80a, 80b) and - a surface coating (86), present on the face of the half-shell facing the respective sealing foil, heat-sealable and / or ultrasonically sealable and having barrier properties to humidity and / or oxygen or fats.

8. Packaging according to claim 7 characterised in that said surface coating (86), present on the face of the half-shell facing the respective sealing foil, heat-sealable and / or ultrasonically sealable, is a film, applied by lamination, of high or medium density polyethylene.

9. Packaging according to any of claims 1 to 8 characterised in that the shaped sheet forming said half-shells is a stretchable sheet with an extensibility (determined according to ISO 1924-3 standard) of 3% to 15%.

10. Packaging according to one of claims 1 to 9 characterised in that the sheet of paper material, forming at least one of said half-shells, further comprises a layer made up of printing inks (82), applied to one face of the paper layer (80; 80a, 80b) and a layer of protective surface coating (84) applied to cover the layer of printing inks (82).

11. Packaging according to claim 1 characterised in that each of said half-shells (2,3) is associated with a respective sealing sheet (6,7) and in which one (2) of said first or second half-shell comprises a food substance (4) and is formed from a multi-layer composite extensible sheet comprising: - at least one layer of paper (80), preferably two layers of paper (80a, 80b), - a surface coating (86) applied by lamination on the face of the half-shell facing the respective sealing sheet, heat-sealable and / or ultrasonically sealable, having barrier properties to humidity and / or oxygen or fats, preferably formed from a high or medium density polyethylene film, - at least one layer formed from printing inks (82) applied to the paper layer (80, 80a), and - a layer of surface protective coating (84) applied to cover the layer of printing inks (82).and wherein the respective sealing foil comprises at least one main paper layer (66, 66a), a surface coating of heat-sealable or ultrasonically weldable plastic material (68) formed by a polyethylene or high density polyethylene film, applied to the face of the foil facing the half-shell with which it is associated, an optional coating layer (70b, 70c), formed by a laminated polypropylene film with moisture and / or oxygen barrier properties, optionally metallised, interposed between the main paper layer (66) and the surface coating (68), a surface coating (62) present on the face of the sealing foil facing the other half-shell formed by an ultrasonically weldable lacquer and a primer layer (64) based on natural biological substances, interposed between said lacquer coating (62) and said at least one main paper layer (66, 66a; 76).

12. Packaging according to claim 11, characterised in that the other (3) of said first and second half-shells contains a toy object (5) or a non-food product and is made of a multi-layer composite extensible sheet comprising: - at least one layer of paper (80), a surface coating (86) applied by lamination on the face of the half-shell facing the respective sealing foil, heat-sealable and / or ultrasonically sealable, having barrier properties to humidity and / or oxygen or fats, preferably made of a high or medium density polyethylene film, - at least one layer of printing inks (82) applied to the paper layer (80, 80a), and - a layer of protective surface coating (84) applied to cover the layer of printing inks (82), and wherein the respective sealing foil (7) comprises: - a main paper layer (76), - a surface coating (78, 80a)79) heat-sealable or ultrasonically sealable applied to the face of the foil facing the half-shell with which it is associated, chosen from a laminated film of polyethylene or high density polyethylene or a layer obtained by applying a heat-sealable lacquer and - a surface coating (71,72) present on the face of the sealing foil facing the other half-shell, chosen from a layer (72) formed by an ultrasonically sealable lacquer obtained from a mixture comprising ethylene vinyl acetate and a solvent or water and a laminated film of polypropylene (71)., 13. Packaging according to claim 12, characterised in that the surface coating (72) present on the face of the sealing foil facing the other half-shell is made of an ultrasonically sealable lacquer obtained from a mixture comprising ethylene vinyl acetate and a solvent or water, said sealing foil further comprises a primer layer (74), comprising natural biological substances, in particular a mixture of water and polysaccharides, interposed between said ultrasonically sealable lacquer coating (72) and said at least one main paper layer (76) and in which the surface coating (78) of heat-sealable plastic material applied to the face of the foil facing the half-shell with which it is associated, is a laminated film of polyethylene or high density polyethylene.

14. Packaging according to one of claims 1 to 10, characterised in that said first (2) and second (3) half-shells are each provided with a respective sealing sheet (6, 7) and in which the flanges (2', 3') of said first and second half-shells and the respective sealing sheets have appendicular formations (20, 30; 60, 70) for opening the packaging, the appendicular formations (60, 70) of each sealing sheet (6, 7) being superimposed or superimposable on the appendicular formations (20, 30) of the respective half-shell, each sealing sheet being connected by thermal or ultrasonic welding to the annular flange of the respective half-shell also in correspondence with said appendicular formations.

15. Packaging according to any of the preceding claims, characterised in that said first (2) and second (3) half-shells are connected to each other by welding the respective sealing plates (6, 7) along annular regions (110a, 110b) of said plates superimposed on the flanges (2', 3') of said half-shells, with the exclusion of welding in correspondence with said appendicular formations.

16. Packaging according to any of claims 1 to 15, characterised in that the sealing foil (6, 7) of the first and / or second half-shell is connected to the flange (2', 3') of the respective half-shell with a weld whose adhesion force to said flange, in a first portion (90a, 90b) of the surface of said flange, generally opposite to the appendicular formation, is greater than the adhesion force to the remaining portion of the flange surface, such that the minimum force, exerted to allow the detachment of the foil from said remaining portion, does not generate the detachment of the foil from said first portion.

17. Package according to any of claims 1 to 16, wherein one of the two half-shells is provided with a respective sealing sheet, characterised in that it comprises a flattened paper material removal or spreading tool (112) placed between said sealing sheets and ultrasonically welded to one of said sheets.