APMP process - Key to optical properties of mechanical bagasse pulp

Plant scale mechanical pulping of Bagasse was studied using Sodium hydroxide and Hydrogen peroxide as impregnating chemicals as being done in Alkaline Peroxide Mechanical Pulping (APMP) process technology. Along with Sodium hydroxide, Sodium silicate and Magnesium sulfate were also dosed. Impregnation and refining were carried out in two stages. It was found that the APMP pulps were having higher scattering coefficient at the equal level of strength properties as compared to conventional CTMP pulps from bagasse where the impregnating chemicals were Sodium hydroxide and Sodium sulfite. However there was not much reduction in shives content. To find a way out laboratory studies were carried out for the reduction in shives content by the pulp after first stage refining and carry out bleaching and second stage refining and compare the shives content of the pulp with the conventional method of first stage refining, second stage refining followed by screening and then bleaching.