(1) the glass transition temperature and softening point temperature. Polyester filter cloth is thermoplastic fiber, the glass transition temperature of 68-81 ¡æ, the glass transition temperature, molecular chain mobility, polyester filter cloth force is not easy deformation, is conducive to the normal use; polyester filter cloth softening point temperature of 230-240 ¡æ, above this temperature, fiber orientation to solution, the molecular chain segment movement of deformation, and the deformation can not reply. In the process of dyeing and finishing, to control temperature above the glass transition temperature, softening temperature. The heat setting temperature dyeing factory general was 80-220 ¡æ, dyeing, finishing and garment ironing temperature should be lower than the heat setting temperature, otherwise they will be molecular chain activities intensified and failure setting effect.

 
(2) heat resistance. In fiber synthesis of several main, the best heat resistance of polyester filter cloth. This is because the composition of polyester filter cloth polyethylene terephthalate higher melting point. Polyester filter cloth began to soften at 230-240 ¡æ, 260 ¡æ began to melt. Polyester filter cloth in 170 ¡æ short time heating strength loss caused by the temperature decrease in recovery after.