午夜精品久久久久久久尤物,好爽毛片一区二区三区四

Last time, we introduced some common sensory identification methods. This time, we will introduce other ways to identify scarf fabrics!

Combustion identification method: the combustion identification method is a simple identification method to identify the types of fabrics according to the different conditions of fabrics during combustion. It is applicable to the identification of raw materials of pure spinning fabrics and interlaced fabrics.

(1) Identification process of combustion identification method.

① Select cotton yarn with obvious difference from 4 different positions of the fabric and remove several to make the cotton yarn disperse into flocculent fibers.

② Use tweezers to clamp the fiber or cotton yarn close to the flame slowly, and carefully observe the changes of the fiber when approaching the flame, burning and leaving the flame. For example, whether the cotton yarn shrinks and melts when it is close to the flame; Flame color and fiber during combustion; Whether the fiber continues to burn when leaving the flame and the smell emitted by the fiber.

③ Observe the hard and soft levels of the color and shape of the embers after combustion.

④ According to the transformation of cotton yarn during combustion.

Other identification methods

① It will be difficult to distinguish the type and content of blended fabric fibers by sensory visual inspection or combustion identification method. At this time, only microscopic method, dissolution method or density method can accurately analyze the fabric composition according to the longitudinal / cross-sectional micro morphological characteristics, melting state and melting characteristics of various fibers to accurately identify the fiber type and content. The microscope method and dissolution method are highly accurate in fabric identification, suitable for qualitative identification of various fabrics, and suitable for new fabrics that have never been touched.

②. In short, there are many methods to identify the fabric fibers, which requires the discriminator to use them flexibly, accumulate experience, follow the principle of simplicity to complexity, and facilitate accurate and convenient identification of fabrics.

There are many ways to distinguish the scarf fabric. This is only one or two of them. We can also use other methods. So what information do you know about scarves? Comment on everyone and answer for you!