Popular science | Cotton yarn appearance inspection standard reference

1. Yarn Line appearance quality (a combination of visual inspection and hand feel)

1.1 The yarn must go through air splicing and electronic yarn clearer, and requires fixed weight or Fixed length.

1.2 There should be no oil stains, soot yarn, color difference, or wrong counts in the yarn. The foreign fibers are determined according to customer standards. The standard range is as follows:

　① Overlap: Both ends of the package are higher than the original yarn plane; more than 18 (32 counts Below) 0.15 cm, width 0.3 cm; below 18 (more than 32 branches) 0.25 cm, width 0.4 cm; length more than 5 cm is not allowed, and one place below 5 cm is allowed. Second-floor platform: It is not allowed to protrude more than 0.3 cm at one end.

② Wrong branch: No matter how many, it is not allowed.

③Oil stains (including color stains/mildew stains): No matter how deep or small it is, it is not allowed.

④ Second-floor platform: Single end protruding more than 0.3 cm is not allowed.

⑤Mesh yarn: It is not allowed to form a mesh. Three yarns of 2 cm or less are allowed at the big end of a single jump yarn. No more than 2 cm is allowed. Two yarns of 2-4 cm are allowed at the small end.

　⑥Severe embossing of the bobbin is not allowed

　⑦Chrysanthemum core: The longitudinal direction of the tube is not allowed to exceed 1.5 cm.

　⑧Gutter Grooves: Depths exceeding 0.25 cm are not allowed.

⑨Loose yarn, belt yarn, pigtail yarn, gourd yarn, color difference, fraying, broken yarn bobbin, deformation and falling edges, flying flowers on the surface of the bobbin, and yarn residue in the package are all unqualified yarns.

⑩ If raw yarn is required, the raw yarn should not be less than 13 cm, and should be tightly wound around the bottom of the bobbin so that the yarn is attached to the surface.

1.3 There should be no thick places or long detailed yarn defects.

1.4 There should be no broken ends or random ends caused by wear and tear inside and outside the package yarn.

1.5 Single yarns and strands cannot have strong or weak twist parts (compared to normal yarns).

　1.6 There cannot be double yarns in single yarns. There cannot be three-ply yarn or multi-ply yarn in the thread.

1.7 If the quality of the fabric surface in the trial fails to meet the requirements or the trial ends exceed the standard (the standard is 8-10 or more ends after 5 million meters of warping), it will be judged as unqualified.

1.8 Yarn must provide small samples 15 days in advance (generally 4 small samples are about 5cm thick) for raw yarn index identification and trial weaving, and finally determine whether the raw yarn indicators are qualified

　1.9 If the large sample indicator does not match the small sample indicator, Contact the manufacturer promptly.

1.10 Use the same paper tube for the same variety; the same paper tube cannot be used for different varieties. Different manufacturers require different paper tube colors to avoid mixed and wrong branches of different varieties due to the same paper tube color.

2. Appearance shaping requirements of simple yarn

Flying flowers, waste yarn and other debris are not allowed in the package yarn. There should be no obvious unevenness on the surface of the package, and the package tube should not be obviously damaged or deformed. In order to prevent warping breakage, the maximum diameter of the yarn is required not to exceed 21cm, 22cm for open-end spinning, and prevent the yarn from being too loose or too hard to cause yarn breakage.

3. Packaging requirements

The normal requirements for packaging include weight, batch, variety, date, and moisture regain. Write down the yarn count, ingredients, and place of origin.

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