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prewound bobbins

The most common fibers for Bobbin Threads

Bobbin thread is not always considered a factor when troubleshooting problems. Because the bobbin thread does not go through a needle, there are fewer problems with bobbin threads than with top threads. Common types of bobbin threads are cotton, spun poly, cotton-wrapped poly, and filament poly.
  • Cotton Quilters love it. It keeps the fiber content consistent with the fabric, batting, and top thread. Cotton has a higher heat tolerance than polyester and can handle the high-heat setting of an iron for pressing. For embroidery, it is OK, but on dense fill designs, cotton bobbin thread will result in a stiff design. Lower-quality cotton threads produce more lint which in turn requires more frequent machine cleaning. Choose a good quality bobbin thread.
  • Spun poly and cotton-wrapped poly. Stronger than cotton. Many machine quilters like this thread due to its strength. Like cotton, it does not have a slick surface. Both Spun polyester and cotton-wrapped poly tends to displace lint due to the nature of the fiber. There are however, good quality versions spun polyester threads such as Superior Spun Poly  which has a tighter-twist resulting in lower lint.
  • Filament poly This thread has a medium sheen and is virtually lint free. It can be thin and lightweight, yet strong. Embroiderers love this thread because it creates a soft backing, even on dense designs. Many machine quilters like using a filament poly thread in the bobbin. Due to its smooth surface, it works well with all types of threads, including metallic thread. Examples of lint-free, smooth bobbin threads are The Bottom LineSo Fine! #50, and So Fine! #60.
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By: Bob Purcell