The process of setting machine should be judged by three factors: temperature, time and tension.
I. Temperature
When the fabric is heat-setting with the stretch-setting machine, the control of temperature will determine its qualitative quality. Because after heat setting, the degree of wrinkles eliminated on the original surface of the fabric, the improvement of surface smoothness, the dimensional thermal stability and other wearing properties of the fabric are closely related to the heat setting temperature.
II. Time
Before finalizing, a certain temperature can be reached, which requires heating. Therefore, setting time is another important technological condition for heat setting of stretching and setting machine. When the fabric enters the heating zone, the heating and setting time can be divided into the following parts: heating time, thermal penetration time, molecular adjustment time and cooling time.
Usually, the quality control of the heat setting process of the stenter setting machine mainly refers to the control of heating time, thermal penetration time and molecular adjustment time, but does not include cooling time. If the term is regarded as a preheating effect, then the setting time only refers to the time required for the second and third terms, i.e. the time required for thermal infiltration and molecular adjustment.
Generally speaking, the quality of the heat setting process of the stretch setting machine is mainly reflected in the control of the time required for heating and thermal penetration of fabrics with different factors such as performance, area, weight, thermal conductivity of fibers and moisture content of fabrics.
III. Tension
Because the tension on the surface of the fabric will change under certain conditions, it will affect the dimensional thermal stability, strength and elongation at break of the fabric. Especially in the thermal setting process of the stretching machine, the thermal stability of the warp dimension increases with the increase of the warp overfeeding while the thermal stability of the weft dimension decreases with the increase of the stretching degree of the door.
Therefore, the quality of the process can be basically guaranteed by controlling the three factors of temperature, time and tension.
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