|
Abstract:
|
Fiber cohesion is defined as the energy necessary to separate fibers from an
assembly and is a characteristic comprised of two primary components: fiber friction
and the entanglement of coiled, crimped, or hooked fibers. Optimization of cohesion
for several short staple fibers has improved yarn quality and processing efficiency.
However, limited published research exists on the cohesion of nylon 6,6 long staple
fiber, a principal fiber used in carpet pile yarns.
Two key fiber properties that have been shown to influence the cohesion of nylon
6,6 fiber are crimp frequency and the viscosity of the lubricant in the spin finish. To
study the effects of these two properties on nylon 6,6 carpet yarn processing and bulk
properties, fiber variants were converted into plied yarn, heat-set by two methods,
and processed into finished carpet. Friction and cohesion properties were determined
in fiber, sliver, and yarn forms by several test methods. These measurements were
then correlated with sliver, yarn, and carpet quality data.
The selection of a finish lubricant was found to significantly influence yarn bulk
and carpet body. However, the viscosity of the lubricant did not explain all
significant results. Fiber crimp level influenced card mat openness and sliver
evenness. Finally, the Monsanto-Mill Heat-set Yarn Bulkometer was proven as a new
test method for determining heat-set yarn bulk.
|