Modern Yarn Processing Requirements
BY PHILIP J LEAH, FIBREGUIDE LTD., UK AND ALFRED¯ W. THOMAS, III FRANKL & THOMAS, INC., GREENVILLE, SC
When synthetic fibers were first produced they all had to be twisted before they could be woven or knitted because of what we today call yarn defects, mainly broken filaments.
Fiber producers have greatly improved their efficiencies and have reduced broken filaments almost to zero. This higher quality fiber along with air entanglers produces yarns that in many cases can be woven or knitted without further processing.
As demands on process efficiency increase, so do the interlace requirements. In effect, this comes from higher downstream process speeds and more complex and demanding yarns. Good interlace in the melt extrusion processes will minimize loose filaments which cause unwinding faults and broken filaments (in DTY these faults can be seen as end breaks, tension transients, broken filaments and ultimately fabric faults). To a certain extent, air entangling has replaced twisting as a way to hold fibers together in many yarn applications.
The patented FG10 Jet Range from Fibreguide covers an array of melt spinning processes using the same, patented, technologies. The FG10 range works from POY, FDY & SDY to BCF & T&I yarns. The technology is designed to hold the filament bundle in the optimum position at all times, which along with ultra-high accuracy machining techniques, gives very re g ular interlace with regular node s t rength, and, offers big downstream processing advantages such as reduced tension transients and tension peaks (even at very high process speeds), and better transfer efficiency, which ultimately results in improved production efficiency and better fabric quality.
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| FG10SE Single Position Jet designed for use in the take up position for main interlace. Using a diff e rent jet core it can also be used for oil migration. |
FG10E 10 end x 6.5mm Pitch Jet designed to fit between godets and incorporating a threading bar for easy operation. |
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| FG10T-TWIN Assembly |
FG5 with Dog Tail Bkt plus lid off and jet core. | |