Bernina 350PE User Manual page 22

Preparation - Sewing
22
Important Facts about Sewing Needles
Thread
Needle, Thread and Fabric
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
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:
033301.70.04_1007_B330_B350_B380_EN
Needle size
70-75
80-90
100, 110, 120