Figure 1 - Thread Tension Test Design
The thread tension test tests for upper and bobbin tension. When you look at the back side of the sewn material, approximately 1/3 of the width of the bars should show bobbin thread. This however, is subject to a variety of conditions, such as the type of thread being used, material thickness and weight, and quality of thread and material.
The thread tension test should be sewn with not more than one thread break for the entire design. It should be sewn on one layer of white broad cloth (Melco PN: 344754-01) (or any white polyester material) or the equivalent with one layer of backing (ARC PN: C20162210).
