| 摘要 |
The invention provides textile cores having improved start-up grooves. In a preferred embodiment the start-up groove has a generally V shaped cross-section and at least one longitudinal portion of the groove, preferably the trailing portion of the groove, has at least one compound angle sidewall defined in longitudinal cross-section by a plurality of alternating, substantially rectangular tongue and notch sections extending along the sidewall. In accordance with another aspect of the invention, improved grooving blades for textile cores are formed using an electric discharge machining (EDM) process.
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