What is Flatlocking?
It is a serged seam that opens flat. It has many uses, not just decorative but functional as well. When constructing garments that have high loft or excessive bulk like fleece, fur or upholstery fabric this allows the seam to lay flat. Once the seam is serged then you gently tug the two pieces of fabric so that the seam lays FLAT. (If necessary use a pressing cloth and press the side that has the ladder or straight stitching.) Never place a hot iron on fleece unless you want to emboss with an iron print. :-)
By placing decorative thread in the upper looper you can embellish ready to wear garments like t-shirts, jackets and so on. You can piece squares together to create a quilt. There are many patterns available for this technique.
How do you set up the serger for a flatlock stitch. First check the machine manual for suggested settings. Most sergers achieve this stitch using the left needle, upper looper and lower looper for a 3 thread flatlcok. A 2 thread flatlock can also be used if desired.
The needle needs very little tension (between zero and one is a starting point), the upper looper at a normal setting, the lower looper needs to have excessive tension or very tight. The needle thread will form the ladder stitch on the back, the upper looper thread will lay flat on the right side of the fabric. The lower looper will be the thread that pulls the needle thread across the back and set the stitch for the upper looper thread.
If you have any questions about this serger stitch, just ask??????