Textile core having improved start up groove
AssigneeSonoco Products Company
InventorTony F. Rummage
Life of this patent
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Abstract
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.
Claims12
A textile core comprising an elongate tubular body for supporting a yarn package and comprising:
- a substantially circumferential groove for gripping an incoming yarn line for windup on said core, said groove being formed in at least a portion of the periphery of said tubular body adjacent one end thereof;
- said groove having a generally V shaped cross-section including an open top, a closed bottom and two sidewalls disposed on opposite sides of a center line extending radially into said tubular body, at least a first longitudinal portion of said groove having a first compound sidewall defined in transverse cross-section by a first surface extending upwardly from the bottom thereof and defining a first predetermined acute angle with said center line and a second surface extending downwardly from the top of said groove and defining a second predetermined acute angle with said center line, said second predetermined acute angle being greater than said first predetermined acute angle;
- said compound sidewall of said groove having a substantially uniformly roughened matte surface finish provided by fibers of the material forming the elongate tubular body for engaging said incoming yarn line.
Dependencies are inferred from the claim text.