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A polyester jersey can wick sweat efficiently before decoration but behave differently beneath a large printed logo. The contrast occurs because the print changes the route that liquid moisture can take through the knit.

Polyester filaments leaving a spinning line may need drawing to achieve the target mechanical and dimensional properties. Drawing is controlled extension of the filaments, often between roller groups called godets. The relationship between roller surface speeds is a simple and useful setting, b

Fresh polyester filaments emerge hot from spinneret holes. They must cool sufficiently and consistently before downstream guiding, drawing or winding. A quench system supplies controlled cooling air to the filament bundle. Its temperature, humidity where relevant, velocity profile and direction

Before molten PET is extruded into fine polyester filaments, the polymer passes through a tightly controlled assembly called a spin pack. Its filtration and flow-distribution functions help remove unwanted particles and deliver more uniform melt to the spinneret. Learning the difference between

Intrinsic viscosity, usually abbreviated IV, is a widely used indicator when evaluating PET polymer for fibre manufacture. It describes how dissolved polymer chains influence the viscosity of a suitable solvent in the limit of very low polymer concentration. IV is related to molecular size and

Polyester filament manufacturing begins well before molten polymer reaches a spinneret. PET chips absorb moisture during handling and storage, and even a relatively small amount can influence the polymer when the chips are heated for melt spinning. Drying is therefore a process-control step, no