After finishing quality check points, it is worth collecting

First, wash size change rate

The rate of change in the size of washed water, commonly known as shrinkage, is an important internal quality indicator. As an ordinary consumer, it is easy to notice this problem. The poor control of the finishing and shrinking process is the main reason for the unqualified or unstable fabric shrinkage.

For example, the process parameters such as moisture content, vapor pressure, pressure roller pressure, and the speed of the shrinking machine before the pre-shrinking pre-shrinking fabric are all important. If they are not well-known, there will be a phenomenon of “false pre-shrinking”. Causes the warp shrinkage of the finished product to be unstable or non-standard. Once this problem is found, the solution can only be returned to the finishing workshop for repairs.

The standard of change rate of water wash required by customers is usually -3%~0, and the standard of internal quality control of printing and dyeing plants will be set at -3%~-2%. If the shrinkage rate is controlled at around 0, it is for consumers. More secure, but the loss of cloth processing in a printing and dyeing factory is much greater, and as a factory is not willing to do so.

Second, the twill fabric "including diagonal stretch fabric) stretch

If the washing and weft change of the finished product exceeds the standard requirements, the resulting garments (mainly trousers) will appear distorted after being washed, thereby affecting the beauty of the garments and the performance of the garments, and customers may not accept such problematic garments. The reason for the skew problem is that the inherent quality index is not well controlled when the stenter is set. To fundamentally solve this quality problem, we can only strengthen the process and quality management of the tentering process, requiring that each box of cloth be washed before the stenter, and that according to the test results, the stretching process can be maintained to maintain stable quality. If the printed and dyed fabrics are found in the garment factories and the problems are found, they can only be returned to the printing and dyeing plants for re-repair. This will cause great losses to the dyeing factories. For example, if the garment factory does not strictly control the finished fabrics with such problems as clothing, the consequences will be more serious.

When the twill weave pattern is printed on the twill weave, it sometimes happens that we have to deal with the contradiction between the grid skew and the skew when wefting, and we tend to miss each other. This kind of situation is very difficult and difficult to handle. The reason for this is that the semi-finished products before printing are not skewed (or are not arranged for tentering), and there is little room for recovery after printing. When the plain fabric printing pattern is printed, the contradiction between the printed grid pattern and the weft of the fabric can also be encountered. This is also a problem that the pre-printing latitude is not in place or the lapel is not strictly controlled.

Third, the strength of the grinding cloth

The types of abrasive cloths that are prone to problems are mainly those of some light and thin fabrics, because the light fabrics have much lower fabric strength compared with heavy fabrics. Under normal conditions, after pretreatment and then roughening, Its breaking strength and tear strength can meet the standard requirements, but there is little room left. If the degree of buffing is a bit heavy in the grinding process, the strength of the finished cloth may be lower than the minimum required by the clothing. Printing and dyeing factories should pay special attention to this situation when grinding and polishing production.

Fourth, the cloth produced by the finishing process

The finishing machines include hot air tenters, setting machines, shrinking machines, sanding machines, calenders, and other equipment. These machines also have some common defects and defects that are unique to this process. For instance, the color spots, stains and oil stains stained on the surface of bleached fabrics or light-colored fabrics, as well as oil stains on dark fabrics, are common defects if the machines are not properly cleaned. Different machines may cause curls, wrinkles, fabric scratches, damage, etc., which can affect the quality of finished products.

Shrinkage-proof machine is easy to produce wrinkle-proof, shaping machine may produce holes in the eye of needles or defects on the needles; if sanding, whitening and calendering processes are not well-controlled, it will also lead to color difference or edge before and after the finished product. Color difference problem. These flaws with obvious process features also deserve attention.