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ANALYSIS OF THE HEATING NEEDLE MACHINE, IN SEWING PROCESS AT HIGH SPEEDS

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Author(s): Ioan Pavel Oana | Dorina Oana | Liliana Doble

Journal: Annals of the University of Oradea. Fascicle of Textiles, Leatherwork
ISSN 1843-813X

Volume: XIV;
Issue: 2;
Start page: 71;
Date: 2013;
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Keywords: needle | material thickness | fiber composition | heating the needle.

ABSTRACT
Needle heating due to friction with the material and sewing, has negative effects on sewing process. Relatively low thermal conductivity of fabrics will cause thermal degradative effects concentrating on a limited area, placed around the needle holes. Thermal degradation leads to a decrease sewing thread strength, after which follows the melting and his rupture. The main factors that influence needle warming can be grouped as follows:Factors that depend on the material, they are: fiber content, thickness and number of layers, the physical density, structure, finishing treatment, thermophysical properties, etc.Factors that depend sewing: fiber content, fineness, structure and type of wire, twisting, finishing, all the dependence of the material being sewn.Factors that depend on the sewing machine: speed drive needle stitching structure, step size, depth of penetration of the needle into the fabric, yarn tension force, pressure foot on materials, the hole in the needle plate.Factors that depend on the needle: the geometry of the needle diameter and the length of the lower rod, the length and cross-sectional dimensions of the grooves, the hole shape, the length and shape of the tip and ends of their, the manner of finishing of the surface of the needle through use of the various special plating processes.Working conditions: The length of time sewing and stops, standard microclimate conditions; existence needle cooling systems, provided they do not affect the user.
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