What is the difference between knitting yarn and weaving yarn?

What is the difference between knitting yarn and weaving yarn?

The difference between knitting yarn and woven yarn, knitting yarn requires higher evenness and softness Well, it has a certain strength, extensibility, and twist. During the process of forming knitted fabrics on a knitting machine, the yarn is subjected to complex mechanical effects. Such as stretching, bending, twisting, friction, etc.

In order to ensure the normal production and product quality, knitting yarn should meet the following requirements:

01 Yarn should have certain strength and extensibility

The strength of yarn is an important quality indicator of knitting yarn.

Since the yarn is subjected to a certain amount of tension and repeated loads during the preparation and weaving process, the yarn used for knitting must have a certain strength.

In addition, the yarn is also subject to bending and torsional deformation during the knitting process. Therefore, the knitting yarn is also required to have a certain extensibility to facilitate bending during the knitting process. Looping and reducing yarn breakage.

02 The yarn should have good softness

For knitting The softness of the yarn is higher than that of woven yarn.

Because the soft yarn is easy to bend and twist, it makes the loop structure in the knitted fabric uniform and the appearance clear and beautiful. It can also reduce yarn breakage and breakage during the weaving process. Damage to looping parts.

03 Yarn should have a certain twist

Generally speaking , the twist of knitting yarn is lower than that of weaving yarn.

In addition, yarns with excessive twist will affect the elasticity of knitted fabrics and cause the loops to skew.

However, the twist of knitting yarn cannot be too low, otherwise it will affect its strength, increase breakage during weaving, and make the yarn bulky, making the fabric prone to pilling. Reduce the wearing performance of knitted fabrics.

Therefore, the correct selection of twist is an important way to rationally select yarn.

Knitted fabrics have different uses and different twist requirements.

(1) Jersey cloth is required to be smooth, compact, with a smooth surface and clear texture. The twist of the yarn should be larger, which can be close to the same linear density woven warp standard.

(2) The twist of the yarn for outerwear should be larger to enhance the stiffness and improve the pilling phenomenon.

(3) Cotton fabrics and elastic fabrics are required to feel soft and elastic, and the twist of the yarn should be slightly lower. Generally, the lower deviation of the twist of the weft yarn for weaving with the same linear density is used.

The yarn used for fleece knitted fabrics is to facilitate brushing and make the pile thickness uniform, and the twist requirement is smaller.

In addition, the degree of twist also varies with the linear density of the yarn.

04 The linear density of the yarn should be uniform and the yarn defects should be few

Yarn linear density uniformity, that is, the uniformity of yarn lines, is an important quality indicator of knitting yarn.

A uniform yarn is beneficial to knitting processing and ensures fabric quality, making the loop structure uniform and the cloth surface clear.

Yarn defects are also an important indicator of yarn used in card clothing.

If there are thick spots on the yarn, the weaving will not pass smoothly, causing yarn breakage or damage to the machine parts, and it is easy to form “horizontal strips” and “horizontal stripes” on the cloth surface. “Cloud spots” reduce the quality of knitted fabrics;

If there are details on the yarn, the strength is insufficient and the ends are prone to breakage, which affects the quality of the fabric and reduces machine productivity.

Because there are multiple loop-forming systems on the knitting machine that feed yarn into loops at the same time, not only is the thickness of the yarn in each loop required to be uniform, but the thickness difference between the yarns in each loop is also required. Strictly control it, otherwise horizontal stripes, shadows and other defects will be formed on the cloth surface, which will reduce the quality of the fabric.

05 Yarn should have good hygroscopicity

Yarn The ability to absorb moisture from the air is called hygroscopicity.

The moisture absorption capabilities of various fibers are very different, and the amount of moisture absorption varies with the temperature and humidity of the air.

Yarns used in knitting production should have a certain degree of hygroscopicity.

Under the same relative humidity conditions, yarn with good hygroscopicity, in addition to its better electrical conductivity, is also beneficial to the stability and extensibility of the yarn twist. Improve, so that the yarn has good weaving performance.

06 Yarn should have good smoothness and small friction coefficient

Knitting yarn should be as free from impurities and oil stains as possible, and should be very smooth.

Unsmooth yarns cause severe wear and tear on machine parts, easily damaging machine parts, and there are a lot of flying flowers in the workshop, which not only affects the health of workers, but also affects the productivity of knitting machines. and fabric quality. </p