Regarding whether the roving cylinder of a carding machine should have a large diameter or a small diameter, this is actually a problem that requires comprehensive consideration. In modern carding machine technology, the combination of a small diameter roving cylinder with a widened working width has become the mainstream trend for high-yield carding machines. However, this does not mean that a large diameter is completely useless. The key lies in the specific production requirements and the overall design of the equipment.
The following table clearly contrasts the main features of the two schemes, which can help you quickly understand their respective advantages and disadvantages.
The small-diameter wire rollers have inherent limitations in terms of the grooming area. To address this issue and fully utilize their advantages, modern carding machines employ a series of key technologies:
Increase working width: This is the most direct and effective method for compensating for the combing area. For instance, the Swiss Lida C70 model and the German Trutzler TC8 combing machine have achieved the largest effective combing area to date by increasing the working width to 1.5 meters.
Optimize the overall layout: By raising the sliver cylinder and lowering the center positions of the doffer and the comb roller, the combing arc length can be increased. The combing arc length of the Trutzler TC8 model reaches 2.84 meters, and the Crossroll MK7 model has even expanded the combing arc to 245 degrees. These measures have significantly enhanced the separation effect.
Using additional combing elements: Installing front and rear fixed covers and cotton net cleaners around the roving cylinder has become a standard configuration for modern high-yield carding machines. They can perform pre-combing and fiber sorting, significantly improving the quality of the roving, and are the key to achieving high production and quality in small-diameter schemes.
Make a choice based on the requirements.
Overall, which option to choose depends on your production goals:
If your goal is high output, high efficiency and excellent impurity removal effect, and the fibers being processed are not sensitive to damage (such as some synthetic fibers), then the small-diameter cylinder scheme is a more modern and efficient option.
If you are processing fibers that require special care (such as long-staple cotton or high-value raw materials), and you are more concerned about minimizing fiber damage while having relatively low production requirements, then the traditional large-diameter roving frame with its gentle combing characteristics might be more suitable.