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Nick Triantafillopoulos, Bruce Schreiner, James Vaughn
Latex Carpet Compound Rheology
Appl. Rheol. 18:6 (2008) 64250 (9 pages)
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This is a study of three-phase foam rheology to qualify penetration in to backing webs during frothed carpet compounds
applications.Transient viscosity as a function of shear rate under a short time period is proposed to characterize flow of these
compounds in response to a rapidly changing shear field during their application.We developed a fluid dynamic model that
predicts the shear and pressure distributions in the compound during its processing in a metering nip based on process
parameters and rheological results.We tested frothed compound formulations that are empirically known to be "penetrating"
and "non-penetrating" based on the choice of soap (frothing surfactant). Formulated at the same froth density, penetrating
to carpet backing compounds had large froth bubbles, relatively low transient shear viscosity and showed increasing
foam breakdown due to shear when compared to non-penetrating compounds. Such frothed compounds readily collapse
under shear and have relatively low dynamic stability, so the transition from a three-phased (air/aqueous/solid) to a twophased
(water/solid) system occurs much easier and faster during application. The model predicts the shear rate development
and a small difference in the pressure distributions in the applicator nip between these formulations, but reduction in
drainage for the non-penetrating formulation.
► Cite this publication as follows:
Triantafillopoulos N, Schreiner B, Vaughn J: Latex Carpet Compound Rheology, Appl. Rheol. 18 (2008) 64250.
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