[Use & storage]
♦ Different lot number and production date cannot blend together before confirmation. Spandex with the same lot number, similar size and nearly produced date is recommended.
♦ It is necessary to keep temperature and moisture at stable levels in the whole process. The best temperature for workplace conditions is: 25 °C ± 3°C for temperature; 60%--70% for RH.
It is not fitful to put spandex in isolation; to store with such chemical products as sulfur dioxide and nitrogen oxide, which would lead to decomposition.
The suggested storage limit is within 6 months for below 70D and 12months for above 70D.
Before placed on the machine, they shall be balanced for 12-24 hours in the workshop for better effect.
[Dyeing & Finish]
♦ Under the high temperature condition, strength and stress of spandex yarn will decline to a certain extent and have different resilience. In order to ensure the fabric quality of the finished cloth, attention shall be paid to the dyeing and finishing conditions.
In the dry state at 180℃ without tension, the action time shall be less than 50 seconds.
In the wet state at 125℃ without tension, the heat preservation period shall be less than 30 minutes.
Products of High temperature resistant series:
In the dry state at 185℃ without tension, the action time shall be less than 50 seconds.
In the wet state at 130℃ without tension, the heat preservation period shall be less than 30 minutes.
♦ The PH value of dyeing liquid shall be controlled between 3 and 10. The dyeing liquid shall be acidic (PH<7) for polyester and nylon fabrics and alkaline (PH>7) for cotton fabric. In the process of operation, it is strictly prohibited to use aromatic solvents, bleach containing active chlorine (such as sodium hypochlorite), alkaline and unsaturated oil and fat (such as linseed oil, animal oil, etc.), heavy metal salt (aluminum, chromium, zinc, etc.), benzoic acid dye intermediates, etc.
Attention: The above parameter is for reference only and without any technological and legal responsibilities. Before utilizing any spandex with new lot number, it is necessary to make specific tests according to different purpose and determine best parameter for crafts.