[one-step spinning and two-step spinning] what is one-step spinning and what is two-step spinning
Filament production process
Two step spinning (chip spinning):
Petroleum -- naphtha -- p-xylene (PX) -- terephthalic acid (PTA) + ethylene glycol (eg) -- polyester chip (PET) -- polyester filament (PFY)
One step spinning (direct spinning):
Petroleum -- naphtha -- p-xylene (PX) -- terephthalic acid (PTA) + ethylene glycol (eg) -- polyester filament (PFY)
Staple fiber production process
Two step spinning (chip spinning):
Petroleum -- naphtha -- para xylene (PX) -- terephthalic acid (PTA) + ethylene glycol (eg) -- polyester chip (PET) -- polyester staple fiber (PSF)
One step spinning (direct spinning):
Petroleum -- naphtha -- p-xylene (PX) -- terephthalic acid (PTA) + ethylene glycol (eg) -- polyester staple fiber (PSF)
2、 Specification and variety introduction
Polyester filament can generally be divided into POY (pre oriented filament), FDY (fully drawn filament) and DTY (low elastic filament). The production process is as follows:
There are generally two types of POY, one is directly used for weaving, the other is used for texturing, which becomes DTY after processing, and the specifications are generally 50D, 75D, 100D, 150D, etc
FDY is generally directly used for weaving or warp knitting, with specifications of 50D, 68D, 75D, 100D, 150D, 200D, etc
DTY is generally directly used for weaving, and its specifications generally range from 75D to 300D.
