needle type
3 Schmetz models, with the manufacturer's own product information. Genuine spare parts and our in-house technical service back every one of them.
A
A. Skip stitches and needle breakage
Three causes of skip stitches in vehicle seats processing:
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B
B. Thermal damages and the solution
As a rule, high sewing speeds are not used in seat production. The foam used as backing on the underside of the material permits only low revolution sewing machine operation in the region of 1,500 – max. 3,500 stitches/minute. But expanded plastic strips made from polyurethane Pu or other plastic materials are similar, in that they can only be sewn without damage at a reduced sewing speed. If these sewing speeds are exceeded, thermal damage occurs in the form of melted residues on the needle and material layers sticking together. The physical properties (melting point of approx. 170 –235° C) of expanded plastic materials dictate the sewing speed.
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C
C. Damage to the material and the solution
In vehicle seats production damage to the material is a frequent problem. Besides the use of too large needles for sewing, another main cause of damage is the use of unsuitable needle point styles.
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