The production of polyester-cotton yarn primarily follows cotton spinning processes. Key stages include carding, blending, and sliver formation, followed by subsequent steps such as combing, drawing, roving, and ring spinning.
The carding process aims to separate fibers into individual units and improve their straightness and parallelism. The blending process ensures the fibers are thoroughly and uniformly mixed. The sliver formation process produces slivers that meet specific requirements.
The combing process serves to remove fine fiber defects, further separate fibers, and eliminate short fibers (below a certain length) to enhance fiber length uniformity and straightness; it also attenuates the sliver to the desired thickness, further improves fiber parallelism and straightness, and produces a sliver that meets specifications.
The drawing process involves doubling 6–8 slivers to reduce long-segment unevenness, attenuating the slivers to a specified linear density while further improving fiber straightness and parallelism, achieving uniform fiber blending through doubling and drafting, and coiling the resulting "finished sliver" neatly into a can for use in subsequent processes.
The roving process aims to uniformly attenuate the finished sliver and further straighten and align the fibers; it also applies appropriate twist to the drafted strand, imparting sufficient strength for winding and unwinding.
The ring spinning process attenuates the roving to the target linear density and straightens/aligns the fibers; it twists the strand to create a yarn with specific twist levels and strength, winds the twisted yarn onto bobbins, and forms a package of a specific size and shape to facilitate handling and further processing.