During the working process of the stenter setting machine, the temperature is the main factor affecting the quality of heat setting. During the operation, the original wrinkles are eliminated after the heat setting of the fabric, and the surface smoothness is improved. The dimensional thermal stability and other wearing properties of the fabric are closely related to the level of heat setting temperature.
The setting time of the stenter setting machine is another main process condition for heat setting. After the fabric enters the heating zone, the time required for heating and setting can be roughly divided into the following parts:
1. Heating time: After the fabric enters the heating zone, the time required to heat the fabric surface to the setting temperature.
2. 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.
3. Molecule adjustment time: After the fabric reaches the setting temperature, the time required for the molecules in the fiber to be adjusted according to the setting conditions.
4. Cooling time: the time it takes for the fabric to leave the drying room to fix the size of the fabric for cooling.
The setting time usually referred to by the stenter setting machine usually refers to the time required for the first three items, and to a certain extent does not include the fourth item. If one item is regarded as a kind of preheating effect, then the setting time only refers to the time required for the second and third items, that is, the time required for thermal penetration and molecular adjustment.
The time required for heating and heat penetration depends on the performance of the heat source, the weight per unit area of ??the fabric, the thermal conductivity of the fiber and the moisture content of the fabric. The tension that the fabric receives during the heat setting process has a certain effect on the quality of the setting, including the dimensional thermal stability, strength and elongation at break of the fabric.
The thermal stability of the warp direction increases with the increase of the warp overfeed during setting, while the thermal stability of the weft direction decreases with the increase of the degree of stretching of the door width. The average single yarn strength of the finalized fabric is slightly higher than that of the unshaped one, and the change in the weft direction is more obvious than that in the warp direction. After setting the fabric's breaking elongation, the weft direction decreases as the extension degree increases, while the warp direction increases as the overfeed increases.
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