If you have any needs pls contact me-
Whatsapp number of Ivy: +86 18933516049 (My Wechat +86 18933510459)
Email me: 01@songhongpaper.com
During the papermaking process, water serves as an essential medium that facilitates the bonding of plant fibers to form a cohesive sheet. Without adequate moisture, fiber entanglement and network formation cannot occur effectively. However, excessive moisture can adversely affect paper properties.
Specifically, when the moisture content exceeds a critical threshold, even papers with robust fiber structures may experience structural loosening. This phenomenon is attributed to the reduction in inter-fiber bonding strength as moisture levels rise. In practical terms, tensile strength reaches its peak when the paper's moisture content equilibrates with an ambient relative humidity of approximately 30% to 35%. Tear resistance and folding endurance peak slightly later but subsequently decline significantly with further increases in humidity. This occurs because while individual fiber flexibility improves with higher humidity, the hydrogen bonding between fibers weakens, leading to reduced overall mechanical strength.
Moreover, moisture content has a pronounced effect on paper brittleness and fold endurance. Insufficient moisture increases stiffness, rendering the paper more brittle. Under such conditions, fiber slippage and stress distribution capabilities are diminished, resulting in decreased flexibility and poor folding performance.
To achieve optimal functional performance, paper must maintain an appropriate equilibrium moisture content. Therefore, drying on the paper machine should be carefully controlled-not excessively or insufficiently-but tailored according to the specific type and intended application of the paper.
