Nguyên nhân và loại bỏ dấu vết ngừng hoạt động của máy dệt kim tròn

Circular knitting machines commonly leave streaks in the weft direction of the fabric after stopping, and the characteristics of these streaks vary based on factors such as fabric type and machine conditions. Generally, a fine indentation appears, distinctively marking the boundary between the fabric woven before and after machine stoppage. In some cases, wider streaks may occur, and the differentiation between the fabric before and after stopping is less pronounced. These streaks can lead to color variations in dyed fabric, causing challenges in fabric cutting and resulting in wastage if the issue is frequent and severe.

Causes of Streaks after Machine Stops:

There are several reasons for the occurrence of streaks:

1. Sự thay đổi đột ngột trong việc vận chuyển sợi có thể dẫn đến độ căng sợi không đồng đều, thay đổi hình dạng và kích thước của cuộn dây, gây ra các sọc.
2. Wear between the drive gear and the main spindle due to relative oscillations during yarn delivery can lead to gear positioning groove and shaft wear. This wear affects yarn tension, resulting in streaks.
3. Relative sliding between the yarn delivery adjustment disc and the drive belt due to wear or insufficient pressure can cause friction coefficient changes, impacting yarn tension and creating streaks.
4. Wear or clogging of the drive teeth in the yarn carrier, wear of the drive belt, or increased relative sliding during machine stoppage and startup can alter yarn delivery per unit coil, causing streaks.
5. Sự lỏng lẻo hoặc mòn đai truyền động của các bộ phận liên quan khác của hệ thống băng tải sợi có thể gây ra sự căng thẳng không đồng đều khi máy ngừng hoạt động và khởi động, tạo thành các sọc.

Methods for Improving Streaks:

Để cải thiện sọc, một số phương pháp có thể được thực hiện:

1. Extend the deceleration time of the knitting machine to minimize the oscillation rate between gears and the relative sliding rate of the drive belt, reducing the abrupt change in yarn tension.
2. Increase the warp tension to stabilize yarn tension during machine stoppage and startup.
3. Reduce the virtual position of the lifting rod of the triangle seat chassis to minimize relative oscillation between gears and shafts, as well as reduce the virtual position between the needle bed and the triangle.
4. Choose machine models with wear-resistant components, avoiding designs that use steel wire runways and wave beads to minimize wear-related issues.
5. Control the lifting amount of the triangle seat chassis to prevent excessive drift during high-speed rotation, keeping the displacement within acceptable limits.

In summary, addressing the root causes of streaks and implementing these improvement methods can contribute to minimizing or eliminating streaks after a circular knitting machine stops.