Knitted sweaters, from fiber to yarn, are the first hurdle that determines quality

2026-08-17 12:21:25

Yarn is the foundation of knitted sweaters, and the grade of raw materials and spinning process directly determine the warmth, feel, and service life of sweaters. This step is also the easiest link for low-priced sweaters to cut corners.

1. Raw material screening and proportioning

The first step in production is to select raw materials based on product positioning:

Pure wool and pure cashmere styles will be classified and screened according to fiber fineness, length, and whiteness, removing short, coarse, and impurities to ensure that the yarn is uniform and consistent;

For blended products, fibers are accurately weighed according to the designed proportions, such as wool+acrylic, wool+polyester+spandex, to ensure stable composition ratios for each batch.

Tiecheng conducts ingredient and grade testing on every batch of raw materials entering the factory, and returns any unqualified materials directly to maintain the bottom line of quality from the source.

2. Combining hair and loosening

The screened fibers will enter the carding machine, and an appropriate amount of carding oil and anti-static agent will be added to thoroughly mix and loosen:

Distribute fibers of different components evenly to avoid uneven distribution of local components;

Moderately increase fiber lubrication to reduce yarn breakage and wool particle problems during subsequent spinning processes.

The uniformity of this step directly affects the stability of the subsequent yarn and the color difference and pilling performance of the finished garment.

3. Combing hair and spinning yarn

After being opened, the fibers are combed by a carding machine to straighten out the messy fibers into parallel and uniform strands. Then, through the processes of coarse and fine yarn, they are gradually stretched and twisted, and spun into fine yarn of the specified count

The higher the yarn count and the finer the fibers, the higher the requirements for raw material grade and spinning equipment, and the finer the woven fabric;

Twist determines the tightness of the yarn: high twist is more wear-resistant, low twist is softer, and it needs to be accurately matched according to product positioning.

4. Formation and inspection of tubular yarn

The spun fine yarn is finally wound into standard tube yarn, which can only enter the next stage after passing the appearance, count, strength, and twist tests. High quality tube yarn with uniform tension, no knots, and minimal color difference is the foundation for efficient weaving in the future.