available only in plastic. While it looks similar to a Class 15 bobbin, it has a slight curve to its sides. This curve is barely visible, but it can significantly affect the performance of the bobbin. Thus, Class 15J bobbins cannot replace Class 15 bobbins in a machine.
Class 66 Bobbin
Class 66 bobbin is yet another bobbin that is about the size of an American nickel. It has a diameter of approximately 20.5 mm and a width of approximately 10.9 mm. It is available in both metal and plastic. It has a significant curve on the sides, and appears to be same as the Class 15 bobbin; however, it cannot replace the bobbin in any machine.
L Style Bobbin
Style L bobbin is the size of an American nickel, measuring approximately 20.3 mm in diameter and approximately 8.9 mm in width. It has two flat sides, and is available in plastic, aluminum, and Magna-glide core.
M Style Bobbin
Style M bobbins are about the size of an American quarter, with a diameter of approximately 24.9 mm and width of approximately 10.7 mm. It has two flat sides, and is available in metal and Magna-glide core.
Now that we know about the most common bobbins that are used depending upon the structure and size, let us look at some others that are classified based on the material they are made of. While there is a list of materials that bobbins can be made of, the most common ones include metal, aluminum, and plastic.
Metal bobbins – These are the most common bobbins used, made of treated steel. These are often preferred over aluminum and plastic bobbins.
Plastic bobbins – These bobbins are becoming more popular as they are durable and inexpensive, and they generally perform just as well as metal bobbins.
Aluminum bobbins – These bobbins are light in weight and spin faster than metal and plastic bobbins. They perform better than metal and plastic bobbins, but can easily be scratched and damaged.
One other important thing to note here is that bobbins are often confused with pirn. But, both bobbins and pirns differ a great deal. Pirns are rods that taper at the sides, and are not wound evenly from end to end like bobbins. Thus, while they perform similar in fashion to bobbins, they are actually quite different. But, whatever your requirement, you can get them all at Trim Engineering Services, the leading bobbin and pirn manufacturers in India.