Bernina 380 User Guide - Page 22

22 Preparation - Sewing Important Facts about Sewing Needles Thread The thread is chosen according to use. For a perfect sewing result, thread and fabric quality play an important role. It is recommended to use quality brands. Cotton thread █ cotton thread has the advantage of being a natural fiber and therefore is especially suitable for sewing cotton fabrics █ if cotton thread is mercerized, it has a slight sheen Polyester thread █ it has a high tensile strength and is particularly colorfast █ polyester thread is more flexible and is recommended where a strong and elastic seam is required Needle, Thread and Fabric Care must be taken when choosing needle and thread. The correct needle size depends on the selected thread and fabric. The fabric weight and type determine the thread weight, needle size and point form. Checking the needle condition The needle condition should be checked and the needle replaced regularly. A defective needle not only damages the fabric but also the sewing computer. Follow these guidelines: Always replace the needle when starting a new sewing project. Needles, Threads Correct needle/thread combination When sewing, the thread should travel smoothly down the long groove on the front of the needle. Too thin thread or too thick needle The thread has too much clearance in the groove. Skipped stitches and damage to the thread can occur. Too thick thread or too fine needle The thread rubs on the edges of the groove and can get jammed. This can break the thread. Fabric/Thread Fine fabrics: Fine thread (darning thread, embroidery thread) Medium weight fabrics: Normal thread Heavy weight fabrics: Needle size 70-75 80-90 100, 110, 120 033301.70.04_1007_B330_B350_B380_EN