How to evaluate the appearance of yarn and what are the evaluation standards
How to evaluate the appearance of yarn? What are the evaluation criteria?
Yarn appearance quality (a combination of visual inspection and hand feel)
1.1 Yarn must go through air splicing and electronic yarn clearer, and requires fixed weight or fixed length.
1.2 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-ply yarn in a single yarn, and there cannot be three-ply yarn or multi-ply yarn in a strand.
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 to finally determine whether the raw yarn indexes are qualified
1.9 If the large sample index If it does not match the sample specifications, please contact the manufacturer in time.
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.
1.3 There should be no oil stains, soot yarn, color difference, or wrong branches 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 plane of the original yarn ; Above 18 (less than 32 branches) 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.
②Wrong 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.
⑥Severely embossed bobbins are not allowed.
⑦Chrysanthemum core: The longitudinal direction of the tube exceeds 1.5 cm is not allowed.
⑧Trench: depth exceeding 0.25 cm is not allowed.
⑨ Loose 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.
How to evaluate the appearance of yarn? What are the evaluation standards?
2 Packaging requirements
Normal packaging requirements include weight, batch, variety, date, and moisture regain. Write down the yarn count, ingredients, and place of origin.
3 Appearance shaping requirements of the package yarn
There are no flying flowers, waste yarn and other debris 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 For yarn breakage during warping, it is required that the maximum diameter of the yarn does not exceed 21cm and 22cm for open-end spinning. It is also necessary to prevent excessively loose or hard package yarns from affecting yarn breakage.
Keywords:
Yarn Yarn evaluation standards
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