Paper material for fluid containers having characteristics of calibrated fragility and rigidity and a barrier property

Abstract

A paper material, including a base substrate having the following formulation: —a mixture of cellulose fibres, cotton fibres and synthetic fibres, between 50% and 80% by weight—at least one polymeric substance, between 1% and 10% by weight—at least one inorganic filler, between 10% and 50% by weight—at least one polyol and/or acrylic polymer and/or starch, between 1% and 10% by weight—aluminium salts, between 1% and 30% by weight; where the aluminium salts, the at least one polyol and/or acrylic polymer and/or starch being present in at least one surface of the paper material.

1 . A container for fluid material, including an outer shell made of paper material comprising a base substrate having the following formulation:
 a mixture of cellulose fibres, cotton fibres and synthetic fibres, between 50% and 80% by weight;   at least one polymeric substance, between 1% and 10% by weight;   at least one inorganic filler, between 10% and 50% by weight;   at least one polyol and/or acrylic polymer and/or starch, between 1% and 10% by weight;   aluminum salts, between 1% and 30% by weight;   
       wherein said aluminum salts and said at least one polyol and/or acrylic polymer and/or starch is present in at least an outer surface of said outer shell. 
     
     
         2 . The container for fluid material according to  claim 1 , wherein a length of the cellulose fibres is comprised between 0.2 mm and 5.0 mm. 
     
     
         3 . The container for fluid material according to  claim 1 , wherein, in the mixture of fibres, a content of cotton fibres and synthetic fibres is in proportion, varying between 1% and 10% by weight. 
     
     
         4 . The container for fluid material according to  claim 1 , wherein said at least one polymeric substance comprises one or more resins based on colophony, alkyl ketene dimer, acetylsuccinic acid, or epichlorohydrin carboxymethylcellulose. 
     
     
         5 . The container for fluid material according to  claim 1 , wherein said at least one inorganic filler is a mineral filler and comprises one or more substances selected from the group consisting of carbonates, kaolins, talc and mixtures thereof. 
     
     
         6 . The container for fluid material according to  claim 1 , wherein a grammage of the paper material is comprised between 50 g/sqm and 900 sqm. 
     
     
         7 . The container for fluid material according to  claim 1 , further including an inner plastic shell for containing the fluid material, wherein the inner plastic shell is coupled to the outer shell, which in turn acts as a substrate for the inner plastic shell. 
     
     
         8 . A paper material, including a base substrate having the following formulation:
 a mixture of cellulose fibres, cotton fibres and synthetic fibres, between 50% and 80% by weight;   at least one polymeric substance, between 1% and 10% by weight;   at least one inorganic filler, between 10% and 50% by weight;   at least one polyol and/or acrylic polymer and/or starch, between 1% and 10% by weight;   aluminum salts, between 1% and 30% by weight;   
       wherein said aluminum salts and said at least one polyol and/or acrylic polymer and/or starch is present in at least one surface of said paper material. 
     
     
         9 . A paper material, including a base substrate having the following formulation:
 a mixture of cellulose fibres, cotton fibres and synthetic fibres, between 50% and 80% by weight, wherein the synthetic fibres comprise an aliphatic polyolefin and wherein in the mixture of fibres a content of cotton fibres and synthetic fibres is in proportion, varying between 1% and 10% by weight;   at least one polymeric substance comprising one or more resins based on colophony, alkyl ketene dimer, acetylsuccinic acid, or epichlorohydrin carboxymethylcellulose, between 1% and 10% by weight;   at least one inorganic filler, between 10% and 50% by weight;   at least one polyol and/or acrylic polymer and/or starch, between 1% and 10% by weight;   aluminum salts, between 1% and 30% by weight;   
       wherein said aluminum salts and said at least one polyol and/or acrylic polymer and/or starch is present in at least one surface of said paper material. 
     
     
         10 . Paper or paperboard comprising the paper material according to  claim 8  and any configured as a high rigidity, high fragility substrate and a barrier to water, oils, greases and gas. 
     
     
         11 . A method of producing the paper material according to  claim 8 , the method comprising the steps of:
 preparing an aqueous mixture of said cellulose fibres, cotton fibres and synthetic fibres, said at least one polymeric substance, and said at least one inorganic filler,   removing water from the mixture to form said base substrate of the paper material;   carrying out a treatment of said at least one surface of said base substrate with at least one solution based on said aluminum salts and said at least one polyol and/or acylic polymer.   
     
     
         12 . The method according to  claim 11 , wherein said at least one polymeric substance included in said base substrate comprises one or more resins based on colophony and/or alkyl ketene dimer and/or acetylsuccinic acid and/or epichlorohydrin and/or carboxymethylcellulose, and said at least one inorganic filler is a mineral filler and comprises one or more substances selected from in the group consisting of carbonates, kaolins, talc and mixtures thereof. 
     
     
         13 . The method according to one  claim 11 , wherein, after said surface treatment, a step of smoothing said base substrate is carried out, wherein said base substrate is smoothed to ISO 2494 Bendtsen smoothness values of less than about 800 ml/min. 
     
     
         14 . The method according to  claim 11 , further comprising a step of mechanically treating said base substrate to obtain a porosity of 1 sec to 50 sec according to the Gurley method. 
     
     
         15 . Paper or paperboard comprising the paper material according to  claim 9  and configured as a high rigidity, high fragility substrate and a barrier to water, oils, greases and gas. 
     
     
         16 . A method of producing the paper material according to  claim 9 , the method comprising the steps of:
 preparing an aqueous mixture of said cellulose fibres, cotton fibres and synthetic fibres, said at least one polymeric substance, and said at least one inorganic filler,   removing water from the mixture to form said base substrate of the paper material;   carrying out a treatment of said at least one surface of said base substrate with at least one solution based on said aluminum salts and said at least one polyol and/or acylic polymer.   
     
     
         17 . The method according to  claim 16 , wherein said at least one polymeric substance included in said base substrate comprises one or more resins based on colophony and/or alkyl ketene dimer and/or acetylsuccinic acid and/or epichlorohydrin and/or carboxymethylcellulose, and said at least one inorganic filler is a mineral filler and comprises one or more substances selected from the group consisting of carbonates, kaolins, talc and mixtures thereof. 
     
     
         18 . The method according to one  claim 16 , wherein, after said surface treatment, a step of smoothing said base substrate is carried out, wherein said base substrate is smoothed to ISO 2494 Bendtsen smoothness values of less than about 800 ml/min. 
     
     
         19 . The method according to  claim 16 , further comprising a step of mechanically treating said base substrate to obtain a porosity of 1 sec to 50 sec according to the Gurley method.