Pretreatment, dyeing auxiliaries interface, mechanical and chemical finishes for handle, shrinkage, and fastness. Energy, water, and effluent optimization are emphasized. This section explains practical decision criteria, typical test methods, and failure modes that matter in real production. Readers get checklists, calculation steps, and case examples connecting specifications to cost, reliability, and compliance. Links map core concepts to upstream inputs and downstream processes so choices remain consistent across sourcing, manufacturing, and end-use performance. Each article includes definitions, diagrams where helpful, and plain-language notes to help newcomers ramp quickly while giving experienced professionals the depth needed to troubleshoot and optimize. Standards references are cited with context, and whenever trade-offs exist, we make them explicit so you can defend decisions.
Evaluates a continuous washing range as the counter-current cascade it is: computes the wash ratio, the impurity left on the cloth after a given number of boxes at a stated stage efficiency, the same water spent as independent baths for comparison, the boxes a target actually needs and the least water the boxes already built could run on.
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Estimates cradle-to-gate carbon for one finished garment across five stages – fibre, spinning, fabric formation, wet processing and garment make – and returns a range rather than a single figure, widened by the evidence grade you hold for each stage.
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Fits the per-wash decay of an AATCC 22 spray rating from a measured pair, projects the rating at the claimed wash count with and without heat reactivation, and reports the washes a target rating survives either way.
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Models sublimation transfer as a saturating time-temperature dose, returning the efficiency a given press cycle achieves against the ceiling, the ink transferred and left on the paper, and what the residue costs per square metre.
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Combines spectrophotometer drift, repeatability and inter-instrument agreement in quadrature into an expanded uncertainty, subtracts it from the shade tolerance as a guard band, and reports which of the three terms is actually consuming the tolerance.
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Computes the surface strain a rubber belt develops around the compression roller, the compression actually applied at a given utilisation, the residual shrinkage that leaves, and the belt thickness or utilisation a target residual would require.
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Treats reactive wash-off as the geometric dilution series it is: computes the unfixed dye left after dyeing, the fixed fraction each rinse removes, the residual after a given number of baths, the baths actually needed to reach a target and the absurd single-bath liquor ratio that would match them.
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Turns drum and roller speeds into the surface speeds that matter, the slip between wire points and cloth for both pile and counter-pile rollers, the balance between them, and the relative travel a pass puts through the fabric.
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Derives screen open area and theoretical paste volume from mesh count and thread diameter, converts it into wet pick-up, dry deposit and dye applied per square metre, and gives the apparent viscosity a power-law paste has at squeegee shear rather than at rest.
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Models cyclic trimer released from polyester during high-temperature dyeing against what the cooling bath can still dissolve, returning the mass at risk of depositing on fabric and machine and the drop temperature above which nothing crystallises out.
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