Setting time is another main process condition of heat setting. After the fabric enters the heating zone, the time required for heating and setting can be divided into the following parts: the time required for heating the fabric surface to the setting temperature after the fabric enters the heating zone, or heating time. When the surface of the fabric reaches the setting temperature, the fibers inside and outside the fabric have the same heat penetration 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, or molecular adjustment time. The time required for the fabric to come out of the drying room and fix the size of the fabric for cooling, or cooling time. The time of finalization usually refers to the time needed for the first three items, not including the fourth item. If the first term is regarded as a preheating action, then the setting time only refers to the time required by the second and third terms, 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 of the fabric per unit area, the thermal conductivity of the fiber and the moisture content of the fabric.
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