The quality inspection of textile appearance begins with the accuracy of the color. The inspection process is as follows: verify the accuracy of the color; test the weaving defects, raw material defects, pre-treatment defects, dyeing defects and finishing defects, according to the standard requirements to determine whether to suspend the line, open, cut, etc. or spell. When the color accuracy test is controversial, the dispute can be resolved according to the measurement results of the electronic color measurement system.
The raw materials are not evenly dried, and there are obvious big belly yarns, fat and thin wires, too many joints, yarn knots, foreign fibers, poor network yarns, poor quality of spandex coated yarns, uneven blending of blended yarns, etc. May cause fabric to fall. The defects in various raw materials that affect the appearance quality of textiles are all raw materials. It can be upgraded by the inspector's repair, and the inspector must be repaired as necessary. The quality of textile finished products caused by the poor quality of raw materials has been greatly reduced, mainly because the sample quality confirmation and the cylinder sample confirmation did not put the quality inspection of the finished product in an important position, and some colors are not convenient for the discovery of raw materials. Quality issues.
During the repair process, the repair method must be reliable, and it is not allowed to damage the surface of the fabric during the repair process, resulting in new unrepairable defects, which seriously affect the appearance quality of the textile. Sometimes it is easy for all inspectors to ignore such defects before they are discovered. When the customer finds such defects on the ship's sample and proposes repairs, it is very likely that all the products of this order have already completed the inspection and packaging process, and the chaos of the inspection site brought about by rework is conceivable. The blow to the enthusiasm of all inspectors is much more than the impact of rework on their physical strength. The dyeing and finishing merchandiser needs to stand up at this time, patiently do the ideological work of all the inspectors, and complete the rework work in good quality and quantity on the premise of ensuring the delivery date of the product. Protect the package from damage as much as possible while reworking.
Regardless of the type of weaving equipment, weaving defects are produced. There are many reasons for the weaving defects. The equipment itself, the raw materials, the temperature and humidity of the environment, the skill level of the operator, the structure of the fabric, etc. all cause weaving defects. Taking woven fabric as an example, broken weft, shrinkage and weft, parking mark, weft, joint, wrong latitude, warp or weft misalignment, weft dense or too thin, cloth loose, roll The loose shaft, the narrow width of the upper door, the wrong structure, etc. are all common defects in weaving. Some of the various weaving defects mentioned above can be repaired and some cannot be repaired. For those weaving defects that cannot be repaired, we can use the method of hanging lines to make the code, open and cut, and so on. For severely large defects, the cutting must be performed.
The characteristics of different varieties and pre-treatment defects are also different. For cotton or polyester/cotton bleached fabrics, it is important to be white. For polyester strong crepe fabrics, the strength problem after alkali reduction processing is a very important issue. For the polyester-cotton products, the bio-enzyme-polished sanded cotton fabric and the lyocell fabric, the problem of strong damage is still an important issue. Sometimes the defects of the pre-treatment process cannot be found during the processing of this process. For example, after the reduction of the polyester-reduced fabric, the surface of the fabric will have a yellow spot after the water is not dyed. If the cotton fabric is not desizing, it will produce a "paste track" on the surface of the dyed fabric. If the scouring is not clean, the cottonseed shell will remain on the surface of the fabric.
For inexperienced inspectors, it is possible to treat all of these defects as a dyeing point. However, on the other hand, whether it is the pre-treatment defect or the dyeing defect, the inspectors found that these defects should be properly treated, which is the most important for the appearance quality inspection of the product.
For textile inspection, it is found that the dyeing defects are relatively simple. The dyed spots have characteristics such as color and irregular shape different from the background color on the surface of the fabric. Color points, stains, and color traces are the most common staining defects. The discovery of these defects and their obvious labeling and proper treatment in accordance with the inspection criteria are the basic requirements for testing the dyeing defects. In the dyeing process, it is very likely that the fabric will be blocked or broken due to various reasons. In particular, the cylinder will cause great damage to the textile, such as "chicken paw print" on the surface of the fabric or "depression" by Xiaoshan people. The point of the brakes. Such defects are difficult to repair. Sometimes some wool-like varieties are special in raw materials. In the dyeing and cooling stage, the cold water is added too fast, and a lot of defects similar to the “chicken paw print†are produced on the surface of the fabric. Such a wool-like product may also cause the above-mentioned defects on the surface of the fabric if the fabric is excessively dehydrated or the dehydration time is too long. The "fine flower" type of defects on the surface of the fabric needs to be paid special attention by the inspector. It is found that such defects should be reported to the dyeing and finishing staff in a timely manner, and the merchandisers should determine the inspection method for such defective products according to the severity of the defects.
Due to the diversity of the sorting, the finishing points also show diversity. For textiles that are finished for finishing, sanding finishing, napping finishing, and bio-enzyme polishing are common processing methods. The length, density and uniformity of the fluff are the main indicators for testing the quality of the above three types of finishing. For the resin finishing of cotton fabrics, the problem of strong damage of fabrics cannot be ignored. For the functional finishing of the fabric, satisfactory and convincing inspection results cannot be obtained by visual inspection.
For soft finishing where most fabrics are processed, there are two points that require special attention in terms of visual inspection. The first is whether to "drawing" or "cracking", and the second is whether there is "silicone oil spot" on the surface of the fabric. Textile softening is mostly done by impregnating the softener to improve the fabric feel. Too much softener on the fabric can significantly reduce the coefficient of friction between the warp or weft of the fabric. Under the action of external force, the warp yarn can produce a relatively obvious displacement along the weft yarn, which causes "drawing" or "cracking" on the surface of the fabric.
At present, most of the silicone softeners are used. Such softeners are mostly emulsions. When the temperature of the processing environment is too high or the softener emulsion is stored for too long at the work site, the softener may be demulsified. If the softener is not found in time after it has been broken, it will stick more to the rollers of the dryer, the setting machine or the rolling mill. This can cause severe sticking of the light-colored textiles that are subsequently processed. Light-colored fabric adhesive rolls will produce a large number of "soft tracks" on the surface of the fabric. The “soft track†can be repaired, but if the method is not correct during the repair, it will cause more “contamination†on the fabric surface.
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