Expancel mikrosfärernaspåverkan på bestrykningssmetoch bestruken kartong
Sammanfattning: In Sweden, paperboard has been an essential product in the export market and is mainly used as packaging material. Packaging materials corresponded to 66% of all paper and board production in Sweden for the year 2020, which is an increase of 2,5% compared with the previous year . The main function of the packaging is to protect the content inside from physical, chemical, and biological contamination . Usually, paper boards are coated with pigment coatings to improve printing properties of the paperboard. Expancel microspheres are small plastic hollow spheres, which can improve the compressive properties of the paperboard. The purpose of this study is to investigate how Expancel microspheres affects the pigment coating, runnability and coated paper boards [30,31].Iggesund mill located in Iggesund manufacturer and coats high-quality paper boards. The coating formulas are based on existing recipes from the mill. The formulas where adjusted so that 12vol%,37vol% and 50 vol% of the pigments consisted of Expancel microspheres. Two different types of Expancel microspheres were used, one type of microspheres with a density of 80g/L and the other type had a density of 148g/L. To investigate how the microspheres affects the pigment coating the pH, dry content, ash content, viscosity, water retention and density were measured on the pigment coating. The paperboards were coated with pigment coating, containing different volume percentages of microspheres. The paperboard tests included gloss, surface roughness, grammage, thickness, compressibility contact angle and water adsorption.The mixture with 50 vol% of the pigments containing of microspheres with the density of 148g/L had a low pH value which can affect the results of the measurements as the pigment particles are not fully separated from each other. The low pH value resulted that the mixture had a high viscosity, which can create runnability problems. The increased number of microspheres resulted in decreasing solid content and density. The low solid content requires more energy for drying. The increasing amount of microspheres with a density of 80g/L showed an increasing viscosity with Hercules Hi-Shear. The high viscosity in Hercules Hi-Shear show that more force will be required to pump the coating mixture and that the flow in the pipes will be slower at higher viscosity.There is a difference between calculated thickness and the measured thickness of the coated paper boards. Calculated thickness where almost always less than the measured. The SEM(scanning electron microscope)-images showed that the microspheres affected the3thickness of the coated paper board. The size and shape of the particles affected the gloss. The higher content of carbonate 90(C90) resulted in higher gloss. The addition of microspheres lowered the gloss of the coated paperboards. Compressibility on the paperboard increased with the increasing addition level of microspheres. The SEM images showed that higher number of microspheres on the surface of the paperboard increased the compressibility of the surface. The contact angel measurement showed that the coating mixture containing of 50vol% with the density of 80g/L hade the highest contact angel. The Cobb60 method was used to examine the water adsorption the coated paper boards. The paper boards coated with mixtures containing the microspheres of density 80g/L had the lowest Cobb60-values.
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