Boiling water shrinkage test
(1) Take four samples of spandex, remove the surface layer, and then take three paragraphs each with a length of 10cm and mark the distance with a color pen.
(2) Place the sample in boiling water (100 ℃) for 10 minutes, then take it out and hang it dry at room temperature. After 5 minutes, measure its length after shrinkage.
(3) Calculate the boiling water shrinkage rate based on the difference between before and after boiling water, with a standard rate of 10-15%.
Boiling water shrinkage rate (%)=(10cm test length)/10 × 100%
Conclusion: The boiling water shrinkage rate exceeds 10-15%, indicating poor stability of spandex.
Spandex elasticity test
(1) Take four samples of spandex, remove the surface layer, and then take three paragraphs each with a length of 10cm, and mark the distance with a color pen.
(2) Join the head and tail of the sample and test it on a single yarn strength machine, stretching at a speed of 50cm/min.
(3) Firstly, stretch the samples by 100%, 150%, 200%, 250%, and 300% for three times, and then calculate their tensile stress (cn) and elastic recovery rate for the fourth time. Elastic recovery rate%=(10cm test length)/10 X 100%.
Conclusion: Different products have different elastic requirements for spandex. Some products require low elongation, high elasticity or high elongation, low elasticity or low elongation, low elasticity or high elongation, and high elasticity for spandex. Therefore, different fabric types should choose different suitable spandex. Compare the standard rate with other brands using 300% data to ensure consistent quality of spandex used by the enterprise. [3] [4]
- spandex
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