A polyester bobbin is a small, cylindrical spool made of polyester material that is used to hold thread in a sewing machine. It is placed in the bobbin case and works in conjunction with the upper thread to form a lockstitch. Polyester bobbins are commonly used because they are strong, durable, and resistant to breakage. They are also less likely to stretch or shrink than other types of bobbins, which can help ensure consistent stitching. Polyester bobbins come in different sizes to fit different sewing machines, and it is important to choose the correct size for your machine to avoid jamming or other problems.
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