Specifications And Quality Of Cotton Yarn

(1) Specifications and quality of cotton yarn:
① Specifications of carded cotton single yarn are generally divided into 70-56, 55-44, 43-37, 36-29, 28-19, 18-17, 16-10, 9-7, 6-3 according to the count; ② Specifications of combed cotton single yarn are divided into 150-131, 130-111, 110-91, 90-71, 70-56, 55-44, 43-37, 36-29, 28-19, 18-16 according to the count.
Yarn for knitting requires small twist and uniform yarn to ensure that the fleece of knitted sweaters is thick, elastic and warm. Yarn for weaving is required to be light, with few weft knots and uniform yarn.

(2) Inspection method: According to national standards, yarn quality is evaluated according to quality indicators and weight unevenness. Cotton yarn is graded according to yarn uniformity, cotton knots, and impurity particle count. The quality index mainly refers to the strength of the yarn, which reflects the wear resistance and durability of the fabric to a certain extent. The grade of the yarn mainly reflects the difference in thickness of the yarn and the appearance of defects, which directly affects the appearance of the fabric, such as the evenness, clarity and size of the texture. The quality of the yarn is closely related to production management, process conditions, mechanical conditions, technical operation level, the quality of the raw cotton and its reasonable use.

For the technical indicators of cotton yarn, please refer to the national standard GB/T398-93.
The inspection method of cotton yarn is in accordance with GB/T398-93 "Cotton Natural Yarn"; GB/T4743-95 "Determination of Linear Density (or Count) of Yarn-Hanking Yarn Method"; SN/T0450-95 "Inspection Procedures for Exported Natural Cotton Yarn and Combed Polyester-Cotton Blended Yarn".
Inspection is carried out in accordance with the quality specifications and indicators specified in the trade contract.

Packaging, storage and transportation
Cotton yarn can be divided into cheese yarn and hank yarn according to different uses.
The inner packaging of cotton yarn is a plastic bag with a label with the factory name, product name and specifications, registered trademark name, grade, weight, batch number, package number, number of cones and packaging date.
The outer packaging of cotton yarn is mainly cartons or plastic woven bags. The packaging should be neat, dry, and strong, suitable for long-distance transportation.
The inspection validity period of cotton yarn is one year in the north and half a year in the south. Those that have exceeded the validity period must be inspected. The main inspection items: mildew, insect infestation, water stains, pollution, damage, etc.