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3.
Operation
3.1
Needles, yarns and gimps
Subclass
upper thread type
and thickness
589-212000
polyester-fibre yarn,
schappe
589-221000
poly-poly 80/2
10
Needles
Needle system:
Needle thicknesses:
depending on the type of thread and material and the
sewing apparatus (E no.).
The needle thickness to be used for each machine and its sewing
apparatus (E no.) is given on the nameplate.
Yarns
The appearance of the buttonhole is greatly affected by the yarn used.
Synthetic-fibre yarns or even silk yarn can be used as the needle and
bobbin threads.
The appearance of the buttonhole is greatly affected by
–
the yarn used
–
the use of different thicknesses for the needle and bobbin threads.
Gimps
The gimp stabilises the buttonhole and at the same time gives it a
plastic shape.
It should have the following characteristics:
–
not too thick, but supple and strong
–
constant diameter.
The recommended yarns in the following table are only guidelines.
Other yarns and yarn thicknesses may be required, depending on the
sewing apparatus (E no.) and the material.
bobbin thread type
and thickness
polyester-fibre yarn
schappe
70/3
80/2
poly-poly 80/2
579
Nm 90-125
lower gimp thread type
and thickness
not required
70/3
80/2
poly-schappe 15/3
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