BASE PAPER QUALITY FORMATION FOR MANUFACTURE OF WATER-RESISTANT PACKAGING MATERIALS

Abstract

Introduction. The article is devoted to the development and implementation of the concept of paper base quality formation for the manufacture of moistureproof grease- and waterproof paper packaging materials for various purposes with a controlled level of barrier and protective properties, which consists in the creation of high-density and closed structure of packaging paper with the given grease and water resistance. Comprehensive studies of the influence of cellulose type, the degree of grinding of cellulose fiber, the composition and structure of the base paper on the moisture, water and grease resistance of paper packaging materials. It is established that sulfate bleached and unbleached pulp from coniferous wood at a grinding rate of 65-75°SR is the most effective fibrous raw material for the production of base paper for moisture-proof water-proof packaging materials. The aim of the work. The purpose of the study is to identify patterns and establish optimal parameters for the manufacture of base paper for waterproof and greaseproof paper packaging materials. Research methods. In the study sulfate unbleached cellulose of coniferous wood of the NS-2 brand of production of JSC Baltic Cellulose (Russia) and hardwood of the brand of NS-3 production of JSC Svetlogorsk Pulp and Cardboard Mill (Belarus) were used. Fibrous semi-finished products were subjected to dissolution and milling to the required degree of grinding (25-85 °C) in the presence of water in the laboratory role of VALLEY at a drum speed of 500 rpm. The degree of grinding was monitored on a Shopper-Riegler apparatus according to the standard method [30]. The paper samples were prepared using a sheet-fed laboratory instrument with a Rapid Kothen Combined Dryer. Problem formulation. To pack fatty products, paper packaging materials are used that have high barrier properties and protect it from contact with oxygen. It is proposed to achieve a high level of barrier properties and mechanical strength due to controlled regulation of base paper structure and treatment of its surface with substances that provide grease and water resistance.
Description of the main material of the article. Paper samples were examined for basic char-acteristics that meet the requirements for packaging products with high water and grease content. The increased air resistance is ensured due to high closure of the paper surface obtained by using for its manufacture of highly fibrillated and hydrated in the process of grinding fibrous mass with a degree of grinding 65-75°SR.
High quality pulp, the degree of development and homogeneity of fibrillated cellulose fibers in-crease the density of produced paper. Higher degree of fiber milling given more good value of the density of paper from bleached and unbleached sulfate cellulose of coniferous wood is more intense and reaches a greater absolute value – 0.45 and 0.48 g/cm3, respectively. With the increase of paper density, there is an increase in the main indicators of its mechanical strength: destructive force and resistance to stranding. Paper samples obtained from sulfur bleached and unbleached pulp at a grinding rate of 75°SR after pouring have a density of 0.45 and 0.48 g/cm3 and are characterized by the lowest grease per-meability among the tested samples – 453 and 311 holes/m2, respectively. Conclusions and recommendations. It is established that sulfate bleached and unbleached pulp from coniferous wood at a grinding rate of 65-75°SR is the most effective fibrous raw material for the production of base paper for moistureproof grease and waterproof packaging materials.