Covering Machine

The process of air covering yarn, also known as air texturing, is a method used to produce elastic yarns by combining a textured yarn with an elastane core using compressed air. Here's an overview of the process:
1. Feeding the Yarns: The core yarn, typically a filament yarn known for its strength, and the covering yarn, usually a spun yarn for its bulkiness and softness, are fed into the air covering machine.
2. Using Compressed Air: Compressed air is utilized to blow the filaments of the covering yarn apart, causing them to partially intermingle around the elastane core.
3. Interlacing Process: The textured yarn (DTY) is overfed into the air jet with minimal tension, creating intermingling points with the elastane.
4. Elastane Stretch: A specific draw ratio is applied to the elastane during the air covering process, which contributes to the final product's elasticity.
5. Formation of Structure: The air covering process results in a yarn with alternating intermingling points and open lengths, unlike conventional covered yarn where the filament yarn wraps around the elastane.
6. High Production Speed: The air covering process is significantly faster than the conventional covering process, with production speeds typically 30 to 50 times higher.
7. One-Step Process: Unlike the two-step process of conventional covering, air covering is a one-step process that doesn't require extra preparation such as winding the covering yarn on flanged bobbins in advance.
8. Quality Control: Modern air covering machines offer precise quality control with regulated pretension and winding tension, ensuring high yarn performance.
9. Versatility: Air covered yarns can be used in a wide range of applications, including apparel fabrics, automotive interiors, home furnishing fabrics, and technical textiles.
10. Economic Efficiency: The air covering process is more cost-effective and flexible compared to the conventional method, especially for producing fabrics with direct processing of elastane fibers and two-component elastane yarns.

A yarn covering machine is a type of textile machinery used to produce covered yarns by spirally wrapping a covering yarn around a core yarn, such as spandex, to create an elastic yarn with various applications in the textile industry. Here are the key functions and features of a yarn-covering machine:
It can produce single or double-covered yarns with materials such as spandex, lycra, metallic yarn, or rubber as the core, and cotton, polyester, nylon, or other materials as the covering yarn.
The machine is equipped with a full computerized control system or electronic traverse system for ease of operation and precision.
Capable of high-speed operation with spindle speeds ranging from 9000 to 16000 r/min and a wide range of covering twist numbers from 200 to 3000 T/m.
The twist direction can be either S or Z, and the machine can handle various bobbin sizes.
Yarn covering machines are known for their versatility and can be used to make silk covered yarn, among other types of covered yarns.
Some models offer electronic forming for take-up and have a capacity for covering yarn of less than 1000g.
The machinery is designed to be user-friendly, with features that reduce the consumption of machine parts, lower noise levels, and provide data output for better monitoring and control.