Pulp and Paper | Industries

If water used in the various processes of paper and pulp production becomes contaminated, the production yield deteriorates due to paper breakage and holes. In addition, microorganisms in the water can cause problems, such as reduced product quality, which in turn leads to lower productivity. Factors that can cause water quality deterioration include the concentration of recycled water and rotting of raw materials for products such as wood chips that accumulate in the circulation line. To prevent productivity loss due to water quality fluctuations, it is necessary to identify the causes through continuous monitoring of water quality data and to take countermeasures accordingly.

The S.sensing unit installed in a customer’s main production process monitors water quality data at all times. The correlation between the obtained monitoring data and product quality is analyzed based on the customer's operation data to identify the water quality affecting the operation and to understand the fluctuation trend. Kurita then provides a one-stop solution from root cause investigation to resolution, thereby contributing to improved productivity by stabilizing product quality.

In the dryer part of the papermaking process, a lot of steam is used to dry wet paper. If water films are formed on the inner surface of the cylinder roll due to steam condensation, the heat transfer coefficient will decrease, leading not only to lower productivity but also to increased steam and energy consumption.

FINE STEAMTM is added to the steam line to form a water-repellent film on the inner surface of the cylinder rolls in the dryer part, preventing the formation of a water film and contributing to improved productivity and energy savings and reduced GHG emissions. In combination with the continuous residual concentration measurement solution S.sensing™ DW a packaged solution that includes automatic control of chemical injection in line with fluctuations in steam volume and analysis of customers' operation, operational data, and steam reduction effects.

Microorganisms are generated in the pulp raw material process and in the paper making process during water circulation. Since the generation of microorganisms affects product quality, the use of biofouling control agent is common. However, the treatment effect of the biofouling control agent may decrease due to the decomposition of material accumulated in the bottom of the storage tank, reducing product quality and creating odor.

The combination of the biofouling control agent and Kurita Group's proprietary aeration technology enhances the effect of the chemical while preventing the retention of raw materials, contributing to improved productivity and sanitation by stabilizing product quality. In addition, when combined with S.sensing™, the amount of chemical injected can be automatically adjusted to water quality fluctuations and optimize the amount of chemical used.