How to test the quality of Raschel warp knitting machine fabric?

Use a disc sampler to intercept a standard area sample, and weigh it on an electronic balance to convert the square meter weight, with the error controlled within ±3%. With the help of a fabric density mirror, accurately measure the number of horizontal and vertical rows within 10cm, and the longitudinal and transverse density deviations do not exceed ±1.5%. Use an electronic universal testing machine to stretch the sample at a speed of 100mm/min to test the breaking strength and elongation to ensure that it meets the fabric use standards.

Under D65 standard light source (illuminance ≥ 600 lx), visually inspect at a distance of 30-40cm. Focus on checking for weaving defects such as missing stitches, holes, and skipped flowers, stains such as oil stains and color stains, and mechanical traces such as needle marks and poor fabric edges. Minor defects shall not exceed 2 per meter, and serious defects are zero tolerance. At the same time, the cloth surface uniformity is tested meter by meter at a speed of 10-15m/min through the cloth inspection machine to observe whether there are cloud spots and streaks.

Use the friction color fastness tester and the washing color fastness tester to evaluate color fastness. Dry/wet friction level ≥3, washing fading and staining ≥3-4 are qualified. With the help of a circular track pilling meter, after 500 frictions, compared with the standard sample, the pilling level must be ≥3. In addition, the width is measured with a tape measure (error ±1cm), and the weft slope is tested by drawing a right-angle line method to ensure ≤1.5%.

The first piece of production must be inspected, and random inspections are carried out every 2 hours during normal production. After the new product is put into production, the process is changed or the equipment is overhauled, and a full inspection is carried out. Establish a detailed inspection ledger to record the defect type and indicator data to facilitate tracing problems and optimize the production process and equipment parameters in a targeted manner.

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