a_daerr

Hi everyone! I'm actually not a "quilter," but I started sewing in order to start a dog collar business. I was wondering if the experience quilter could answer a few questions related to monofilament, invisible thread. This is what the long-time martingale collar-makers use, and unfortunately, no one wants to give away

Is there anyway to get a secure knot?? In order to close up the ends, I have to actually sew off the edge. But as soon as I cut the thread away, the knot immediately comes undone, which results in these scratchy little pieces coming out. This happens no matter how much I backstitch. Since a dog will be wearing the collar, I'm afraid this is going to rub against their neck. I read an article that says to microstitch (25-30 stitches per square inch) for the first and last eight or so stitches. What does that translate to when my stitch length setting which is given in millimeters? I'm using on a basic Brother CS6000i. Also, does it make a difference if I use cotton thread in the bobbin, or monofilament as well?