Polyester filament is divided by production method: 1. Primary yarn: undrawn yarn (conventional spinning) (UDY), semi-pre-oriented yarn (medium-speed spinning) (MOY), pre-oriented yarn (high-speed spinning) (POY), highly oriented yarn (ultra-high speed) Spinning) (HOY)
Read MoreIn industrial production, human faces are often damaged by high-speed particles, molten metal, chemical liquid splashes, and harmful light. Various protective masks must be used for protection. There are many types of PET plastic face shield, but according to their uses, they can be roughly divided ......
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