How to control the shrinkage of flame-retardant fabrics
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Flame retardant fabric shrinkage fabric flame retardant fabric
Since flame-retardant fabrics shrink by mechanical pre-shrinking, their shrinkage rate must be predetermined and controlled. , the main process is:
(1) Cut two full-width post-processed flame-retardant fabrics as samples, and wash them according to regulations (or customer requirements) And iron, and then obtain the amount of shrinkage in both length and width directions.
(2) According to the shrinkage ratio of the length and width of the sample, adjust the mechanical preshrinking machine to obtain the required preshrinking ratio.
(3) After the processed flame-retardant fabric passes through the pre-shrunk machine, cut a section of sample at the fabric drop place, and the same requirements apply to the un-pre-shrunk sample. Method for washing and ironing to gain shrinkage. This way it can be determined whether the fabric processed by the preshrinking machine reaches the required shrinkage rate.
In order to prevent the flame-retardant cloth from shrinking due to washing during consumption and use, it should maintain its original size or achieve the specified shrinkage during use. When mechanically shrinking, the flame-retardant fabric needs to be moistened and steamed. Sometimes excessive moisture or excessive steam is required. In actual production, the specific operation should be decided based on the actual situation and the finishing of the fabric. But no matter what kind of moistening conditions are adopted, it should be ensured that each yarn (thread) is completely wetted by water. Only in this way can each yarn (thread) shrink.
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