High-strength paper based on short-fiber cellulose and use thereof

Abstract

The present invention claims a paper 100% composed of bleached short-fiber cellulose, of high strength, comprising mineral filler, as well as its use in the production of kraftliner paper and wrappings, box packaging, corrugated materials, and bags, being suitable for food storage, but not limited to these applications.

1 . A paper comprised of 100% bleached short fiber, presenting high resistance, and comprising mineral filler. 
     
     
         2 . The paper according to  claim 1 , wherein the short fiber cellulose being fibrillated. 
     
     
         3 . The paper according to  claim 1 , further comprising a fiber distribution in which the fibers comprise a width between 10 μm and 20 μm, and a variable length between 0.2-3.2 mm. 
     
     
         4 . The papert according to  claim 2 , wherein the fibers are distributed in:
 20-25% with length between 0.2-0.6 mm;   60-65% with length between 0.6-1.2 mm;   1-5% with length between 1.2-2.0 mm; and   0.1-1.0% with average length between 2.0-3.2 mm.   
     
     
         5 . The paper according to  claim 1 , wherein paper has a hygroexpansion CD between 3 and 6%, and a hygroexpansion MD between 0.1 and 0.6%. 
     
     
         6 . The paper according to  claim 1 , wherein the paper has a fibrillation between 0.2 and 0.4%. 
     
     
         7 . The paper according to  claim 1 , wherein the paper exhibits a degree of fiber straightness of 90. 
     
     
         8 . The paper according to  claim 1 , wherein the paper exhibits a curvature index between 10 and 20%. 
     
     
         9 . The paper according to  claim 1 , wherein the paper exhibits a compression strength (RCT) of at least 0.5 kN/m. 
     
     
         10 . The paper according to  claim 1 , wherein the paper is compostable and recyclable. 
     
     
         11 . The paper according to  claim 1 , wherein the paper exhibits a smoothness and uniformity on a surface of the paper. 
     
     
         12 . The paper according to  claim 1 , wherein the paper exhibits a roughness between 130 and 600 mL/min. 
     
     
         13 . The paper according to  claim 1 , wherein the paper is suitable for direct contact with food. 
     
     
         14 . The paper according to  claim 1 , wherein the paper exhibits a grammage between 70 and 210 g/m 2 . 
     
     
         15 . The paper according to  claim 1 , wherein the mineral filler is present in an amount of up to 10% by weight. 
     
     
         16 . The paper according to  claim 1 , wherein the mineral filler comprises calcium carbonate. 
     
     
         17 . The paper according to  claim 1 , wherein the paper comprises a portion of a wrapping, box packaging, corrugated paper, or a corrugated bag. 
     
     
         18 . A food packaging article comprising the paper according to  claim 1 . 
     
     
         19 . A food packaging article comprising at least two layers, wherein each layer is composed of a paper comprising 100% bleached short fiber, said paper exhibiting high strength and comprising mineral filler. 
     
     
         20 . The food packaging article according to  claim 19 , wherein the article is configured and arranged for storage of frozen and hot foods.