Temperature is the most important factor affecting the quality of hot air stenter. After the fabric is heat-set, the degree of wrinkle elimination, the improvement of surface smoothness, dimensional thermal stability and other wear properties of the fabric are closely related to the heat-setting temperature.
The solidification time is another main process condition for hot air stenter thermal solidification. After the fabric enters the heating zone, the time required for heating and setting is divided into the following parts:
Heating time: After the fabric enters the heating zone, the time required to heat the fabric surface to the set temperature.
Heat penetration time: After the fabric surface reaches the setting temperature, the fibers in the inner and outer parts of the fabric have the same heat penetration time required for the setting temperature.
Molecule adjustment time: After the fabric reaches the setting temperature, the time required for the molecules in the fiber to adjust according to the setting conditions.
Cooling time: After the fabric size is determined, the time required for the fabric to leave the drying chamber to cool.
In the hot air stenter, the tension of the fabric in the heat setting process affects the setting quality, the dimensional thermal stability of the fabric, strength and elongation at break. The warp dimensional thermal stability increases with the increase of the warp overfeed during setting, while the weft dimensional thermal stability decreases with the increase of the degree of stretching of the door width. The average monofilament strength of the shaped fabric is slightly higher than that of the unshaped fabric, and the weft direction changes obviously in the warp direction. After setting, the elongation at break of the fabric decreases in the weft direction as the elongation increases, and increases in the warp direction as the overfeeding increases.