POY Quality Assessment and Storage Management
topic
Partially oriented yarn quality management measures birefringence by polarised light microscopy to verify orientation level, checks linear density and yarn evenness, monitors package density and build quality for unwinding reliability in texturing, and manages storage conditions of temperature below 25 degrees Celsius and humidity below 65 percent to prevent the humidity-accelerated orientation relaxation that causes POY property drift during extended storage before texturing.
Role
Maintains POY quality consistency through the storage period between spinning and texturing by monitoring orientation development that determines draw texturing process conditions and controlling storage environment to prevent property changes that would require texturing machine resetting, with POY birefringence being the critical quality parameter that links spinning and texturing processes and whose consistency determines the reproducibility of draw-textured yarn properties.