Paper plates with colored prints and decorations

Abstract

A printed food container having colored patterns, pictures or writing, in which said container is made of laminated paper (10, 20, 30, 40) treated on at least one side with a covering material (Q) which, after the depositing and drying, creates a layer, on the laminated paper, having glassy properties, which gives liquid waterproof properties, in which said laminated paper (10, 20, 30, 40) comprises at least a first layer (10) made of parchment-type paper, in which different patterns, pictures or writing are printed on one side of the first layer of parchment paper (10) with colored ink, making a second layer comprising colored ink (20), a third layer of glue (30) and a fourth layer made from a backing cardboard (40) to provide strength, in which the first layer of parchment paper (10) allows creating a functional barrier that completely blocks the migration of the colored ink present in the second layer (20) towards the outside, or towards the foods contained in the container, and in which said first layer of parchment paper (10) also allows obtaining the transparency needed to make the part printed with colored patterns, pictures or writing visible from the outside, in which said container is made by die-cutting the treated laminated paper. It is also possible to comprise a deep-drawing step for giving the desired shape to the die-cut and treated flat blank.

Description

[0001] PAPER PLATES WITH COLORED PRINTS AND DECORATIONS

[0002] FIELD OF THE INVENTION

[0003] The present invention relates to the field of containers and plates or trays for food made of paper printed with colored pictures, drawings, patterns and decorations.

[0004] PRIOR ART

[0005] The manufacturing of decorated paper plates that are made waterproof with a layer of plastic material is known in the prior art.

[0006] Think, for example, of sets of decorated plates, cups and serviettes for the birthdays of the children, which can be colored and decorated with colorful pictures and drawings of cartoon characters, for example, as shown in Figures 1 and 2.

[0007] EC regulation N. 1935 / 2004, which regulates the sanitary legislation of packaging, containers and instruments intended to come into contact with food substances or substances for personal use, applies to materials and objects, which, as finished products, are intended to come into contact with food products.

[0008] The materials and objects must be produced in conformity with the regulations establishing that, in normal or foreseeable conditions of use, they do not transfer to the food products components in an amount such as to constitute a health hazard, or to lead to an unacceptable alteration of the composition of the foodstuffs and to deterioration of the organoleptic qualities thereof.

[0009] A migration test is provided for certain types of foods, such as meats of all zoological species, transformed meat-based products (such as ham, salami, bacon and other cured meats), cheeses, fresh pastries, fried or roasted foods, etc.

[0010] Current regulations ban the use of any type of printed paper, or carrying photos, pictures, logos or writing for direct contact with food.

[0011] The law requires that paper intended for contact with food must be neutral, i.e. , not written or decorated, to prevent the migration of the ink towards the food.

[0012] Some producers have overcome this rule by producing packing boxes or paper or serviettes having an inner blank side (or devoid of writing and pictures), which comes into contact with the food, and a colored or decorated outer side.

[0013] At present there is a problem relating to the production of plates for foods made of colored or printed paper, which bans direct contact between the color and the foods due to the introduction of the SUP (Single Use Plastic) directive and MD 21 .03.1973. Before the ban on producing and marketing paper plates covered with Polyethylene, it was possible to print the paper using colors for creating decorations, pictures, patterns and logos and then couple it to the Polyethylene PE so there was no direct contact between the colored ink and the food, preventing the migration of the ink.

[0014] In particular, the plastic layer of Polyethylene PE coating the paper served as a barrier to the migration of the colored ink, preventing it from coming into contact with the food.

[0015] Since 14 January 2022, the rules regarding disposable plastic have officially come into effect in Italy as well. The Italian legislative decree, result of the implementation of SUP (Single Use Plastic) directive 2019 / 904 of the European Community, prohibits the sale of cutlery, plates, straws and other products made of plastic, also “oxo-degradable” plastics (material capable of decomposing in the presence of oxygen).

[0016] The list also includes cotton swab (cotton fioc), stirrers for beverages, balloon sticks, a number of particular containers for foods and all those containers for beverages made of polystyrene foam.

[0017] Today, colored inks, paints or colors for paper and cardboard for decorating paper plates and containers intended to come into contact with food, which are capable of completely protecting the food from contamination as a result of the migration of the ink from the container towards the contents, are not available for use.

[0018] Therefore, at present, it is impossible to make a complete barrier to the color, especially because the regulations, which are applied to check whether there is a migration of the inks or not, are only specific to products covered with plastic. Producing and selling disposable products, such as plates, cups, cutlery, ice-cream scoops or stirrers for stirring hot drinks, packaging for food, etc., was banned at the beginning of 2022.

[0019] Therefore, more decisive and concrete regulations do not exist for the chemical substances contained in the paper or boxes used for food packaging. Indeed, new laboratory tests showed that some packaging for foods made of cardboard and paper can contain and release chemical substances originating from the inks used in the printing.

[0020] Paper is the second most commonly used packing material after plastic. However, unlike plastic, no Ell rules exist regulating the use of printed paper as a material in contact with food.

[0021] SUMMARY OF THE INVENTION

[0022] The object of the invention has been achieved by a container as defined in claim 1. A method and machine for making the containers according to the invention are also protected.

[0023] A printed food container having colored patterns, pictures or writing, in which the container is made of laminated paper treated on at least one side with a covering material, which, after depositing and drying, creates a layer, on the laminated paper, having glassy properties, which gives liquid waterproof properties. The laminated paper comprises at least a first layer made of parchment-type paper, in which different patterns, pictures or writing are printed on one side of the first layer of parchment paper with colored ink, making a second layer comprising colored ink, a third layer of glue and a fourth layer made from a backing cardboard to provide strength. The first layer of parchment paper allows creating a functional barrier that completely blocks the migration of the colored ink present in the second layer, towards the outside, or towards the food contained in the container. The first layer of parchment paper also allows obtaining the transparency needed to make the part printed with colored patterns, pictures or writing visible from the outside. The container is made by die-cutting the treated laminated paper to make the flat blank of the container.

[0024] The container is preferably made by deep-drawing the flat blank of the container made of treated and die-cut laminated paper.

[0025] In some embodiments, the first layer of parchment paper is selected from papers having a grammage of 30 - 120 g / m2and preferably 40 - 50 g / m2

[0026] The colored inks are selected from the inks permitted for food grade, such as Direct Food Contact, DFC inks, and in particular from the SUN CHEMICAL AQUASAFE DFC range.

[0027] The third layer of glue is made with food glues, in particular with vinyl or acrylic glues.

[0028] Finally, the reinforcing cardboard is made of virgin paper having a grammage comprised between 100 and 600 g / m2preferably between 200 and 400 g / m2. The covering material that is used to coat the laminated paper is a sol, i.e., a viscous solution containing silicon compounds, which, in the steps following the depositing on the laminated paper, give rise to condensation reactions forming a three- dimensional lattice of silicon-oxygen bonds.

[0029] In the exact composition of the starting sol, in order to make the covering material, some silicon-oxygen bonds are replaced by bonds between silicon and other species, such as alkyl groups.

[0030] The sol forming the covering material (Q) is preferably prepared by dispersing or dissolving, in water or in hydroalcoholic mixtures, at least one alkyltrialkoxysilane and at least a second component selected from micrometric silica and a tetraalkoxysilane, or both.

[0031] In the treatment of the covering material, after being distributed on the laminated paper, the condensation reactions leading to the formation of the glassy layer are created by heating, at temperatures comprised between 100 and 250°C, preferably between 150 and 200°C.

[0032] The method for making the containers comprises the application of the covering material onto the die-cut and laminated paper to make the flat blank of the container, in which the application of the covering material is carried out on at least one side of the flat blank of the container or on all outer surfaces of the flat blank of the container, in which the flat blank is treated with the covering material by means of spreading rollers. Next, the treated flat blank is dried at temperatures comprised between 100 and 250°C, preferably between 150 and 200°C, to create a layer having glassy properties, which gives liquid waterproof properties.

[0033] In some embodiments, the dried flat blank is then deep-drawn to make the shape of the container.

[0034] Alternatively, the method for making the containers comprises the application of the covering material onto the die-cut and laminated paper to make the flat blank of the container and the application of the covering material is carried out on at least one side of the flat blank of the container or on all outer surfaces of the flat blank of the container and in which the flat blank is treated with the covering material by means of spreading rollers. The flat blank thus treated with the covering material and still wet is deep-drawn to make the shape of the container, in which the treated and deep-drawn flat blank is dried at temperatures comprised between 100 and 250°C, preferably between 150 and 200°C to create a layer having glassy properties, which gives liquid waterproof properties.

[0035] A machine for making containers comprises an unwinding station for unwinding the reel of laminated paper, a die-cutting station for making the flat blank of the container, a treatment station for applying the covering material to at least one side of the flat blank made from the die-cut laminated paper, a heating station for heating at temperatures comprised between 100 and 250°C, preferably between 150 and 200°C, to create a layer, on the treated laminated paper, having glassy properties, which gives liquid waterproof properties.

[0036] A deep-drawing station is also present in the machine for making the shape of the container.

[0037] Differently, the machine for making the containers comprises an unwinding station for unwinding the reel of laminated paper, a die-cutting station for making the flat blank of the container, a treatment station for applying the covering material to the flat blank made from the die-cut laminated paper, a deep-drawing station for making the shape of the container, and finally a heating station for heating at temperatures comprised between 100 and 250°C, preferably between 150 and 200°C, in order to dry the covering material and create a layer, on the treated laminated and deep- drawn paper, having glassy properties, which gives liquid waterproof properties.

[0038] The treatment station for applying the covering material preferably comprises spreading rollers.

[0039] BRIEF DESCRIPTION OF THE FIGURES

[0040] Hereafter in this description, reference will be made to the drawings shown in the accompanying figures, in which:

[0041] Figure 1 shows examples of plates and trays according to the present invention,

[0042] Figure 2 shows an example of plates and containers according to the present invention,

[0043] Figure 3 shows an example of laminated paper for making plates, trays and containers according to the present invention, and

[0044] Figure 4 shows examples of laminated paper treated with the covering material.

[0045] The parts according to the present description are represented in the drawings, where appropriate, employing conventional symbols, showing only the specific details relevant to understanding the embodiments of the present invention, so as not to highlight details, which will be immediately apparent to those skilled in the art, with reference to the description provided below.

[0046] DETAILED DESCRIPTION OF THE INVENTION

[0047] The solution according to the present invention will now be described with the help of the drawings.

[0048] Generally, the results of the tests carried out show that the packaging materials for foods made of printed paper and cardboard can contain and release problematic chemical substances, including many that have not been assessed by the European Food Safety Authority. Although none of the products tested separately can endanger human health, they nonetheless contribute to the overall exposure of consumers to problematic chemical substances, which, in some cases, have not been assessed.

[0049] The solution suggested herein allows making plates, trays, tubs, doilies or cake boards and all kinds of paper containers intended for contact with food, in which writing or decorations are present, using colored ink.

[0050] In particular, the solution suggested herein allows making all the above types of containers made of decorated and printed paper for contact with and transport of food, such as the containers shown in Figure 1 and 2.

[0051] In greater detail, the present solution is intended for disposable plates, trays for pastries, trays for cured meats or fish (such as smoked salmon, for example, or various “carpaccios” of meat or fish, hamburgers, cured meats etc.), doilies or cake boards and other containers intended for use with food.

[0052] Said containers are preferably colored or printed with colored inks to make pictures, decorations, writing or logos.

[0053] For example, Figure 1 shows a cake board, Figure 1 a), a tray for savory snacks or sweets, Figure 1 b), a plate decorated with a Christmas decoration, Figure 1 c), a tray for fish or cured meats, Figure 1 d), trays for fresh or dry pastries, Figure 1 e) and a small and decorated plate for birthday parties, Figure 1f).

[0054] Figure 2a) shows a cake board, Figure 2b) a flat plate with a decorated edge, and Figure 2c) a bowl with a decorated edge. Current legislation requires that, in order to come into contact with food, said colored containers must be coated by a layer that completely blocks the migration of the ink from the paper to the food contents. More precisely, it is necessary to place a functional barrier between the ink printed on the paper and the food.

[0055] Additionally, it is necessary to make an extremely strong water and grease barrier and obtain a waterproof layer in contact with the food, according to the migration tests with simulants and at a temperature as defined by current legislation.

[0056] Current legislation MD 21.03.1973 and regulation 10 / 2011 provides that no printed or decorated paper can come into direct contact with food to prevent contamination of the food, which could happen if part of the colored ink were to come into contact with the food.

[0057] Thus, the need has arisen to find a solution that allows continuing to make paper containers having decorations or writing, ensuring a complete barrier to migration of the ink.

[0058] Therefore, starting from a piece of printed or decorated paper (with black or colored inks) the Applicant has developed a solution that allows making a barrier to the migration of the ink and making the containers safe by means of said technique.

[0059] Furthermore, the food containers must ensure impermeability and resistance to contact with food, also in conformity with the global migration requirements defined in MD21 / 03 / 73, regulation 10 / 2011.

[0060] The solution presented herein allows overcoming the problem of preventing the migration of the ink from the paper towards the foods.

[0061] In order to do this, the Applicant has decided to use a special type of paper to print the pictures and decorations and use a covering material Q to make a further barrier to the migration of the ink.

[0062] In particular, the solution comprises making a container, such as, for example, a plate, made in laminated form with several layers.

[0063] As shown in Figures 3 and 4, the solution suggested herein comprises using a first layer 10 made of parchment-type paper (in particular tracing vellum) generally having a grammage of about 40 - 50 g / m2

[0064] Various patterns or pictures are printed on one side of the first layer 10 of parchment paper using special colors certified for direct contact with food, thus making a second layer 20 of ink. In detail, the inks used in the second layer 20 can be selected, for example, from the SUN CHEMICAL AQUASAFE DFC range.

[0065] The layer 10 of parchment paper, opportunely printed with the layer of ink 20 is glued by means of a third layer of glue 30 to a backing cardboard 40.

[0066] The glues for making the layer of glue 30 must be food glues and are generally vinyl or acrylic glues. It is also possible to consider using heat-sealing lacquers, which are activated on application to the product by temperature and act as a heat-sealing adhesive. These heat-lacquers are also generally vinyl or acrylic-based. In any case, they must all be certified for contact with food.

[0067] Therefore, the printed parchment paper 10 is glued, keeping the printed side between the parchment paper 10 and the reinforcing cardboard 40.

[0068] The reinforcing cardboard 40 is typically made of virgin paper having a grammage comprised between 200 and 400g / m2.

[0069] Obviously, it is not possible to use printed and decorated paper as it is, but it must be treated and covered with a waterproofing layer that allows protecting the structure of the container made with said decorated paper during use with food and foodstuffs.

[0070] The laminated paper 10-40 thus obtained is at this point coated on one or all sides with a covering material Q.

[0071] Said covering material Q is capable of making some types of paper transparent, and, by exploiting this property, the idea was to make a container or plate having several layers, capable of overcoming the technical problem of the migration of the inks.

[0072] The covering material Q used to coat the printed and decorated laminated paper will now be described .

[0073] The covering material Q makes it possible to do two things: protecting the decorated paper with which the container is made from water and liquids making it waterproof and allowing preventing the ink from migrating towards the food.

[0074] The covering material Q is a sol, i.e. a viscous solution containing silicon compounds, which in the steps following the depositing on the decorated and printed paper, give rise to condensation reactions, forming a three-dimensional lattice of silicon-oxygen bonds, in which, possibly, depending on the exact composition of the starting sol, some silicon-oxygen bonds may be replaced by bonds between the silicon and other species (frequently, alkyl groups). The structure consisting of this three-dimensional lattice forms, on the surface of the decorated and printed paper, at a macroscopic level, a layer with vitreous properties, making it impermeable to liquids.

[0075] The sol can be prepared by dispersing or dissolving in water or hydroalcoholic mixtures at least one alkyltrialkoxysilane and at least a second component selected from micrometric silica and a tetraalkoxysilane, or both.

[0076] The micrometric silica (also known in the art as “colloidal silica” or “fumed silica”) is a form of silica consisting of silica primary particles of nanometric dimensions (i.e. , dimensions less than a micrometer, pm) generally aggregated to form secondary particles of micrometric dimensions. This material is widely available on the market and is sold, for example, by the company Evonik Resource Efficiency GmbH in Essen (Germany) under the name AEROSIL® (for example, the product AEROSIL® OX 50), or by the company Cabot Corporation in Boston, Massachusetts (USA) under the name Cab-O-Sil®.

[0077] Tetraalkoxysilanes are compounds with a general formula Si(OR)4, in which R is generally a C1 -C6 alkyl radical, preferably C1 -C2.

[0078] Alkyltrialcoxysilanes are compounds with a general formula R’-Si(OR)s, in which R and R’, the same or different from each other, are generally C1 -C6 alkyl radicals, preferably C1 -C2.

[0079] Tetraalkoxysilanes and alkyltrialcoxysilanes are also widely available products.

[0080] A sol used for the purposes of the invention can be obtained by following the method described in patent application WO 2022 / 171893 A1 in the name of this Applicant, by dissolving or dispersing in water between 25 and 40% by weight of an alkyltrialkoxysilane and a second component selected from micrometric silica, a tetraalkoxysilane, or both. When present, the micrometric silica is in amounts comprised between 5 and 20% by weight of the sol, while the tetraalkoxysilane, when present, is in amounts comprised between 15 and 25% by weight of the sol. Optionally, one or more other components can be added to this sol, selected from a C1 -C6 alcohol or a mixture thereof and a base selected from NaOH and KOH in such amounts as to regulate the pH in the range between 2 and 5.

[0081] After distributing the sol gel on the decorated and printed paper, the condensation reactions, which give rise to the formation of the vitreous layer, as described above, are created by heating, typically at temperatures comprised between 100 and 250°C, preferably between 150 and 200°C; in the case of heating at temperatures greater than around 230°C (paper self-combustion temperature), the heating must be quick and only last long enough for the liquid components of the initial sol to evaporate.

[0082] The covering material Q acts as a protection from water, making the colored and printed paper onto which it is applied waterproof.

[0083] The laminated paper comprising layers 10-40 thus produced is used on a reel or in sheets to make the containers or plates with a thermoforming process, which is summarized as follows:

[0084] - Unwinding reel of laminated paper 10-40,

[0085] - Die-cutting of the flat blank of the container or plate,

[0086] - Treatment with rollers for applying covering material Q,

[0087] - Drying of the covering material Q, and

[0088] - Deep-drawing to form the container or plate.

[0089] For flat trays and cake boards, and all flat containers, the last step is not carried out. The stratigraphy of the container or finished board is as follows: covering material Q, Parchment Paper 10, Color 20, Glue 30, Reinforcing cardboard 40, and any covering material Q.

[0090] With reference to Figure 4a, the embodiment is shown, in which all the outer surfaces of the laminated paper 10-40 are coated with covering material Q. Differently, Figure 4b shows the embodiment, in which only one side of the laminated paper 10-40 is coated with the covering material Q; in particular, the treated side is the side made of Parchment Paper 10, which will come into contact with the foods.

[0091] Obviously, it is possible to have intermediate situations in which only some sides of the laminated paper 10-40 are treated with the covering material Q.

[0092] In flat applications (such as flat cardboard trays for salmon and cured meats etc.) the deep-drawing and / or thermoforming step is not necessary. In this case, the coating product or covering material Q can also be applied to a reel or sheet before the die-cutting step.

[0093] The treatment with the covering material Q can be carried out in two ways: 1 ) The covering material Q is applied to the laminated paper comprising layers 10-40, which is then die-cut to make the flat blank of the container or plate. The application of the covering material Q is performed on the outer surfaces of the flat blank of the container or plate; in particular, the flat blank is treated with the covering material Q by means of spreading rollers R to obtain the complete covering and subsequent drying; the treated and dried flat blank is then deep-drawn to make the containers or plates; or

[0094] 2) The covering material Q is applied to the laminated paper comprising layers 10-40, which is then die-cut to make the flat blank of the container or plate. The application of the covering material Q is performed on the outer surfaces of the flat blank of the container or plate; in particular, the flat blank is treated with the covering material Q by means of spreading rollers R to obtain the complete covering; the flat blank, treated and still wet, is subsequently deep-drawn to make the containers or plates and then the container, already deep-drawn, is dried. This second method facilitates the deep-drawing step because the laminated paper treated with the covering material Q is more easily workable for carrying out the deep-drawing.

[0095] The above description of embodiments of the invention is capable of showing the invention from a conceptual point of view so that others, using the prior art, will be able to modify and / or adapt in various applications those specific embodiments without further research and without departing from the inventive concept, and, thus, it is understood that such adaptations and modifications will be considered as equivalents of the specific embodiments.

[0096] The means and materials for achieving the various functions described may be of a various nature, without departing from the scope of the invention.

[0097] It is worth noting that the terminology or expressions used are only descriptive and therefore non-limiting.

[0098] Obviously, without prejudice to the principle of the invention, the construction details and the embodiments can widely vary with respect to what is described and illustrated above by way of example, without thereby departing from the scope of the present invention.

[0099] Where the constructional features and techniques mentioned in the following claims are followed by reference symbols or numerals, such reference symbols were introduced for the sole purpose of increasing the intelligibility of the claims themselves, and accordingly such reference symbols have no limiting effect on the interpretation of each element identified by way of mere example by such reference symbols.

Claims

CLAIMS1 ) A printed food container having colored patterns, pictures or writing, wherein said container is made of laminated paper (10, 20, 30, 40) treated on at least one side with a covering material (Q) which, after depositing and drying, creates a layer, on the laminated paper, having glassy properties, which gives liquid waterproof properties, wherein said laminated paper (10, 20, 30, 40) comprises at least a first layer (10) made of parchment-type paper, wherein different patterns, pictures or writing are printed on one side of the first layer of parchment paper (10) with colored ink, making a second layer comprising colored ink (20), a third layer of glue (30) and a fourth layer made from a backing cardboard (40) to provide strength, wherein the first layer of parchment paper (10) allows creating a functional barrier that completely blocks the migration of the colored ink present in the second layer (20) towards the outside, or towards the foods contained in the container, and wherein said first layer of parchment paper (10) also allows obtaining the transparency needed to make the part printed with colored patterns, pictures or writing visible from the outside, wherein said container is made by die-cutting the treated laminated paper to make the flat blank of the container.2) The container according to claim 1 , wherein the container is made by deep-drawing the flat blank of the container made of treated and die-cut laminated paper.3) The container according to claim 1 or claim 2, wherein the first layer of parchment paper (10) is selected from papers having a grammage of 30 - 120 g / m2and preferably 40 - 50 g / m2.4) The container according to any one of the preceding claims, wherein the colored inks are selected from the inks permitted for food grade, such as Direct Food Contact, DFC inks, and in particular from the SUN CHEMICAL AQUASAFE DFC range.5) The container according to any one of the preceding claims, wherein said third layer of glue (30) is made with food glues, in particular with vinyl or acrylic glues.6) The container according to any one of the preceding claims, wherein said reinforcing cardboard (40) is made of virgin paper having a grammage comprised between 100 and 600 g / m2, preferably between 200 and 400 g / m2.7) The container according to any one of the preceding claims, wherein the covering material (Q) used to coat the laminated paper (10, 20, 30, 40) is a sol, i.e. , a viscous solution containing silicon compounds, which, in the steps following the depositing on the laminated paper (10, 20, 30, 40), give rise to condensation reactions forming a three-dimensional lattice of silicon-oxygen bonds.8) The container according to claim 7, wherein, in the exact composition of the starting sol, in order to make the covering material (Q), some silicon-oxygen bonds are replaced by bonds between the silicon and other types, such as alkyl groups.9) The container according to claim 7 or 8, wherein the sol making the covering material (Q) is prepared by dispersing or dissolving, in water or hydroalcoholic mixtures, at least one alkyltrialkoxysilane and at least a second component selected from micrometric silica and a tetraalkoxysilane, or both.10) The container according to any of the preceding claims from 7 to 9, wherein, in the treatment of the covering material (Q), after being distributed on the laminated paper (10, 20, 30, 40), the condensation reactions leading to the formation of the glassy layer are made by heating, at temperatures comprised between 100 and 250°C, preferably between 150 and 200°C.11 ) A method for making containers according to one or more of the preceding claims 1 to 10, wherein the covering material (Q) is applied to the laminated paper (10, 20, 30, 40) and die-cut to make the flat blank of the container and the application of the covering material (Q) is carried out on at least one side of the flat blank of the container or on all outer surfaces of the flat blank of the container, wherein the flat blank is treated with the covering material (Q) by means of spreading rollers (R), wherein the treated flat blank is dried at temperatures comprised between 100 and 250°C, preferably between 150 and 200°C to create a layer with glassy properties, which gives liquid waterproof properties.12) The method according to claim 11 , wherein the dried flat blank is then deep-drawn to make the shape of the container.13) A method for making containers according to one or more of the preceding claims 1 to 10, wherein the covering material (Q) is applied to the laminated paper (10, 20, 30, 40) and die-cut to make the flat blank of the container and the application of the covering material (Q) is carried out on at least one side ofthe flat blank of the container or on all outer surfaces of the flat blank of the container, wherein the flat blank is treated with the covering material (Q) by means of spreading rollers (R), wherein the flat blank thus treated with the covering material (Q) and still wet, is deep-drawn to make the shape of the container, wherein the treated and deep-drawn flat blank is dried at temperatures comprised between 100 and 250°C, preferably between 150 and 200°C to create a layer with glassy properties, which gives liquid waterproof properties.14) A machine for making containers according to one or more of the preceding claims 1 to 10, wherein an unwinding station is present for unwinding the reel of laminated paper (10, 20, 30, 40), a die-cutting station for making the flat blank of the container, a treatment station for applying the covering material (Q) on at least one side of the flat blank made by the die-cut laminated paper (10, 20, 30, 40), a heating station for heating at temperatures comprised between 100 and 250°C, preferably between 150 and 200°C, in order to create a layer, on the treated laminated paper, having glassy properties, which gives liquid waterproof properties.15) A machine according to claim 14, wherein a deep-drawing station is also present for making the shape of the container.16) A machine for making containers according to one or more of the preceding claims 1 to 10, wherein an unwinding station is present for unwinding the reel of laminated paper (10, 20, 30, 40), a die-cutting station for making the flat blank of the container, a treatment station for applying the covering material (Q) on the flat blank made by the die-cut laminated paper (10, 20, 30, 40), a deep-drawing station for making the shape of the container, and finally, a heating station for heating at temperatures comprised between 100 and 250°C, preferably between 150 and 200°C, in order to dry the covering material (Q) and create a layer, on the treated and deep-drawn laminated paper, having glassy properties, which gives liquid waterproof properties.17) The machine for making containers according to claims 14 to 16, wherein said one treatment station for applying the covering material (Q) comprises spreading rollers (R).

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