| 摘要 |
The invention provides textile cores having improved start-up grooves. The start-up groove has a generally V shaped cross-section and at least one longitudinal portion of the groove, preferably the leading portion of the groove, has at least one compound angle sidewall which has a roughened surface for gripping an incoming yarn line. In addition, the invention provides an improved grooving blade having at least a longitudinal portion of its cutting surface which includes at least one compound angle sidewall with a surface roughness of between about 18 and about 45 measured on the VDI scale. In accordance with another aspect of the invention, improved grooving blades for textile cores are formed using an electric discharge machining process.
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