During the recent years, the paper industry has undergone many changes, such that paper making is done by modern factories in a completely different way from the past. The high use of chemical additives in this industry has increased the quality of paper to a large extent. During the paper-making process, each chemical add-on is added for a specific purpose. Therefore, the use of chemicals in making pulp paper is important.
Types of chemicals and their percentage consumption in the recycling process
In general, various chemicals are used in the process of decontamination of waste paper, and the purpose of their usage, which is mainly added in the repulping process to the pulping machine, helps to separate the composite and adhesive materials from the fibers and prepared for complete separation and disposal from the pulp liquid at the floatation stage. Application of these materials, especially in the mass production scale, should be such that the highest efficiency is achieved with the least cost and avoid using excess chemicals
In the pulping stage, The percentage of dry content of the pulp is important to adjust the amount of chemicals required because the amount of these materials is calculated based on the dry weight of the paper (dried in free air). Therefore, the higher the percentage of dry content means less water and the higher concentration of chemicals in the pulping machine. This will increase the efficiency of chemicals and the possibility of optimizing their amounts.