Standardized Visual Defect Classification Methods for Greige Cloth Inspection
Standardized greige inspection combines calibrated D65 illumination and 4-point scoring to convert visual cloth defects into precise commercial deductions.
Automatic Spreading Systems
Mechanical Payload
Units designed for material web management pull long lengths of woven flax cloth through wet finishing baths without introducing warp distortion or horizontal tension variations. During preparation stages inside Chinese textile mills, automatic spreading systems flatten damp fabric against heavy rubber rollers before chemical bleaching takes place. These motorized units rely on photoelectric edge sensors that detect lateral shifts in the moving web.
Small pneumatic actuators then pivot steering guide rolls dynamically to correct misalignment. Production lines handling heavy linen sheeting require higher nip pressure than delicate cambric weights, so pneumatic regulators adjust roller loads continuously. Correct width retention prevents uneven shrinkage during subsequent boiling stages, protecting the final grain alignment.
Operators verify proper calibration before starting each shift by running a short test length through the nip zone. Any failure in the edge tracking photocells halts the drive motors immediately to prevent fabric tearing.
Batch Record
Mill quality control inspectors enter tension measurements and edge deviation data into the batch tracking ledger after every spreading run. This internal production document records line speeds and pneumatic pressures alongside operator initials. Fabric grades assessed at this stage differ fundamentally from the raw fibre classifications assigned during flax hackling.
Fibre grading evaluates length and tensile strength of individual strands, whereas cloth grading measures surface regularity and count per square centimetre. Mill acceptance thresholds for grey linen allow minor width variations that would violate the stricter export criteria demanded by foreign buyers. Export inspection protocols require absolute dimensional stability across the entire web length before finished bolts receive an official compliance stamp for shipping overseas.
Operational Drift
Mechanical wear in the rubber covering of the nip rollers changes the friction coefficient across the spreading zone over time. Bearings supporting the steering guide rolls accumulate fine flax lint during continuous operation, which increases rotational resistance and slows down lateral correction responses. Technicians clean these mechanical assemblies weekly to maintain the high response speed needed for thin summer weights.
Air pressure delivery lines can develop small leaks, causing gradual drops in roller clamping force during long production runs. Regular maintenance checks prevent width shrinkage from creeping into finished lots unnoticed.