Research To Enhance Liner Board Interpenetrating Network By Surface Sizing Of Crosslinking Enzymatic Starch

Reduce paper’s quantitative can decrease fiber raw material consumption, protect the forest resources, save steam consumption, reduce product transportation. In our country’s paper products structure, wrapping paper and cardboard, newsprint, low quantitative telephone tissue paper, coated paper, bible paper and so on are all being drove to low quantitative direction. How to reduce the quantitative but keep paper’s strength and stiffness better of the existing research is of far-reaching significance. This article mainly to research the liner paper as material, through using crosslinking enzymatic starch as sizing agent to enhance paper’s strength and stiffness.Cassava starch was modified by α-amylase, and the modified starch was applied to surface sizing to improve tensile stiffness of paper. The penetration of starch in paper was also studied. The viscosity of product was 45 m Pa?s, which was applied to paper surface sizing. Under the condition of sizing concentration 12%, the tensile index and stiffness index increased respectively to 50.85 N*m/g and 263.19 N*m3/g. Through image analysis of cross-sections of the paper structure, it was indicated that starch can penetrate to internal paper with low viscosity and surface sizing at low solids contents. In this paper, it could be considered that starch is distributed evenly in the z-direction, when surface sizing with starch of viscosity 45 m Pa?s at 12% solids contents.Glyoxal and AZC as crosslinking agents can be used for starch modification. The paper studied the conditions and mechanism of reaction and used the crosslinking starch in corrugated paper surface sizing to improve the strength and stiffness of paper. Using single factor method to study effects of the crosslinking reaction temperature, time, crosslinker’s dosage and drying time on paper properties. Research shows that, AZC cannot help to increase paper’s properties, but reaction temperature 80℃, time as 15 min, glyoxal dosage 0.5m L/g amount of starch, natural drying 1h following oven drying 2min can promote the properties of paper to achieve the best results: the tensile index increase 18.58% and stiffness index increase 32.11%、1h wet tensile increase 20.27%. For the corrugated base paper, we used only about one-third of the dosage of the cross-linking to reach the effect.