Factors Affecting The Quality Of Flat Screen Printer

Posted by lichengprintingmachine on Jul 16, 2020 in Hot Air Stenter

In the process of the Hot Air Stenter, the temperature is the main factor affecting the quality of heat setting. During the operation, because the fabric is heat-set, the original wrinkles are eliminated, the surface smoothness is improved, and the fabric The dimensional thermal stability and other taking performance are closely related to the heat setting temperature.

The setting time of the tenter is another main process condition for heat setting. After the fabric enters the heating zone, the time required for heating and setting can be divided into the following parts:

1. Heating time: the time required for the fabric surface to heat to the setting temperature after the fabric enters the heating zone.

2. Heat penetration time: After the fabric surface reaches the setting temperature, the fibers in each part of the fabric have the same heat penetration time as the setting temperature.

3. Molecule adjustment time: After the fabric reaches the setting temperature, the molecules in the fiber need to be adjusted according to the setting conditions.

4. Cooling time: the time required for the fabric to leave the drying room to fix the size of the fabric for cooling.

The setting time usually referred to by Flat Screen Printer usually refers to the time required for the first three items, to a certain extent excluding the fourth item. If one item is regarded as a preheating effect, then the setting time only refers to the time required for the second and third items, that is, the time required for heat 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 of the fabric during the heat setting process has a certain influence on the setting quality, including the thermal stability, strength and elongation at break of the fabric.

The thermal stability of the warp dimension increases with the increase of warp overfeed during setting, while the thermal stability of the weft dimension decreases with the increase of the stretch of the door width. After setting, the average single yarn strength of the fabric is slightly higher than that of the unshaped, and the change in the weft direction is more obvious than that in the warp direction. After setting, the breaking elongation of the fabric decreases in the weft direction as the extent of extension increases, while the warp direction becomes larger as the overfeed increases.

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