LANGUAGE
The angle of the spinning cup groove (referred to as the "cohesion angle") is set at approximately 38 degrees. This is primarily to achieve an optimal balance between several interdependent process requirements, including ensuring yarn quality, controlling breakage rates, and adapting to high-speed spinning. On TONGDA's ring spinning machines, this angle has been optimized to ensure smooth fiber entry into the spinning cup, resulting in high yarn strength and low breakage rates.
Why 38 degrees?
This is a technology choice that has been proven in practice, and can be understood from the following aspects:
1. Ensuring effective fiber gripping and orderly arrangement
The size of the convergence angle directly affects the state of the fibers after entering the groove: A small angle results in a steep groove, allowing fibers to slide in quickly and arrange themselves tightly, which is beneficial for improving yarn strength, but may also lead to excessive resistance during stripping due to over-compression. A large angle results in a gentle groove, leading to loose fiber arrangement, resulting in a fluffy yarn with a soft feel, but potentially reducing yarn strength and evenness.
In high-speed spinning production, the 38-degree V-shaped spinning cup groove angle, combined with the high-precision spindle control of the TONGDA ring spinning machine, ensures that the fibers slide smoothly into the spinning cup while maintaining a stable yarn ring structure, resulting in the production of high-strength yarn with a low breakage rate.
2. Balancing Yarn Tightness and Peeling Resistance
During spinning, the formed yarn needs to be continuously peeled and drawn out from the groove. A 38-degree angle allows the fiber loops to maintain sufficient tightness, thereby improving yarn strength. At the same time, this angle prevents the fibers from becoming "stuck" too tightly, keeping the peeling resistance within a reasonable range, which helps reduce yarn breakage rates and ensures stable production.
3. Flexible Adjustments in Practical Applications
In actual production, 38 degrees is not an absolute fixed value. According to a patent document, the reasonable range is usually between 38 and 46 degrees. The specific choice requires a comprehensive consideration of several factors: Raw material characteristics: The requirements for the groove angle may differ when spinning pure cotton compared to spinning polyester or blended yarns. Yarn requirements: Whether the production aims for high-strength woven yarn or soft-feeling knitted yarn. Equipment parameters: Smaller spinning cup diameters and higher rotational speeds usually favor a smaller condensation angle.
In general, the 38-degree design is a commonly used and effective engineering parameter found through long-term practice to achieve optimal results in key indicators such as yarn strength, evenness, and breakage rate. TONGDA ring spinning machines support fine-tuning of the spinning cup angle, allowing for flexible selection of the optimal angle based on yarn application, ensuring ideal evenness and feel for both woven and knitted fabrics.
In addition to the angle, TONGDA ring spinning machines have also been optimized in terms of the material, diameter, and groove shape of the spinning cup, ensuring that the yarn achieves ideal results in terms of high strength, evenness, and low breakage rate, regardless of high-speed production or different raw materials.
