What are the raw materials for wrapping yarn?

Single coated yarn means that one long fiber is the core and the other long fiber is spirally wound around the core in one direction. Usually the core yarn is spandex, and the skin is nylon, polyester and so on. Commonly used varieties of hosiery machine and seamless underwear are 20 12, 2030, 2040, 2070 and 3070.

Double-coated yarn refers to a long fiber with a core and two layers of long fibers wrapped outside, and the winding directions are opposite, so the twist is very small or even absent. Generally used in Luokou. Commonly used14070 * 2,21070 * 2, etc.

Core-spun yarn is a kind of yarn with long fiber as the core and short fiber as the skin, which is usually produced by spinning machines in cotton mills. The core yarn is spandex, and the leather yarn is cotton, wool and hemp.

The difference between wrapped yarn and coated yarn is not very uniform at present. Some people think it is the same concept, while others think it is the same yarn as core-spun yarn.

Wrapped yarn is a yarn made by twisting spandex or wrapped yarn with another fiber.

The difference between covered yarn and core-spun yarn lies in skin yarn, long fiber is covered yarn and short fiber is core-spun yarn.

This distinction is roughly made.

The draft ratio of seamless underwear is generally 2.8-3.0, and that of socks is higher, about 3.2.

Nylon wrapped spandex is generally 20 12, 2030, 2040, 2070, etc. , and polyester spandex is 2028, 2045, 2055, 2075. You can see polyester bags and brocade bags from the specifications. Generally, the back of polyester yarn is 5, depending on the specification of polyester stretch yarn.

There is also a kind of wrapped yarn, which can eliminate the twist by adjusting the process, and can not distinguish the twist direction in the process of underwear weaving, which simplifies the operation.

Empty bags on underwear will be lighter than machine bags. It is also an empty package, and there will be great differences between different brands, such as the yarn content of the fabric, the length of the fabric and so on.

50g underwear, with other conditions unchanged (width, length and equipment scheme), the weight of 2030 bales of yarn from different manufacturers is one gram. For example, the yarn of package A is one gram lighter than the clothes of package B, which means that the yarn of package A is cheaper than that of package B by 3.6 yuan/kg (calculated by 60 yuan/ton). Don't underestimate it. Could be fibers.