Fluid Property
Physical properties of air or steam used in textile drying influence the heat transfer efficiency and the moisture removal rate. The gas viscosity quantifies the internal friction of the fluid medium as it moves through the fabric layers. High temperatures in the stenter frame reduce the density of the air while increasing its resistance to flow, which alters the power requirements for the circulation fans.
Temperature Sensitivity
Kinetic energy in a gas increases with heat, leading to more frequent molecular collisions and a higher gas viscosity. This behavior differs from liquid finishing agents where heat usually makes the fluid more mobile. Designers of linen drying systems must balance the air temperature to optimize evaporation against the increased energy needed to push thicker air through the damp cloth.
Process Uniformity
Uniformity in the finishing cabinet depends on the steady movement of the treatment gas around the hanging yarn or fabric rolls. When the gas viscosity varies due to temperature fluctuations, the air may bypass the center of the roll and cause uneven drying or chemical fixation. Monitoring these shifts allows the control system to adjust fan speeds and maintain a constant mass flow across the production line.
Modern sensors provide the data needed to stabilize the atmosphere within the processing chamber throughout the entire shift.
