Notes on the use of retention aids in the papermaking process

The effective effect of retention aid for paper making process process on paper machine runnability is the ability to reduce the rate of accumulation of deposits on wet-end equipment surfaces. Because once these deposits accumulate to a certain amount, they will fall off, eventually causing paper defects such as holes and stains on the paper. On the other hand, retention aid for paper making process process can improve the production efficiency of the paper machine by increasing the dewatering rate of the wet paper sheet. Recent studies have explored the mechanism of this effect of the retention aid for paper making process process. It prevents the clogging of dewatering channels in the wet sheet and helps to form a porous structure when the sheet is formed. In some cases, dewatering rate is an important factor affecting production efficiency as well as energy consumption during sheet drying.

Auxiliary effectiveness
Papermaking process retention aids play a vital role when used together with other chemical auxiliaries such as sizing agents and wet strength agents. During the sheet forming process, by retaining more fine components on the fibers, these chemical additives can be penetrated into the fibers within seconds after addition, so that the chemical additives can be maximized during the sheet drying process. active. Although these additives have strong adhesion to the fibers, most of them are more easily adsorbed on the fine components in the slurry system, so the retention rate of the additives is far below 100%.

two sides of the page
Due to the design and installation of equipment and other factors in the papermaking process, there will be a difference between the two sides of the paper. Especially when using fourdrinier paper machines, the difference between the two sides of the paper sheet is particularly prominent due to the fact that dehydration mainly occurs in one direction. The problem of double-sidedness is very important for paper sheets with strict appearance requirements. Non-uniform structures such as paper with severe double-sidedness are prone to curling problems with changes in moisture content and temperature during use. The addition of an appropriate amount of retention aid for paper making process process helps to form a uniform paper sheet and reduce the difference between two sides.