Rhéologie des plastisols et leurs procédés d'enduction

Abstract : Spread coating is one of the processes used for the manufacturing of resilient floor coverings. It consists in shearing a plastisol, a suspension of PVC particles and mineral fillers in a liquid phase composed of plasticizer and adjuvants, between a fixed knife and a rotating roll supporting a substrate. Cushion floors are made through successive coating steps. Sometimes defects in the form of droplets appear on some of the successive layers.Defect appearance is strongly dependent on the plastisol nature, on the knife geometry and on the processing parameters such as roll velocity, gap between knife and roll, etc.The study first aims at determining the rheology of several plastisol formulations, model or industrial. The influence of PVC particle size and distribution and the addition and particle size of calcium carbonate filler on the rheological behaviour is studied.In a second step, a model of the flow behaviour is developed to highlight the range of shear rates encountered between the knife and the roll, as well as the velocity field and the coating force. This model then allows the investigation of the coater process parameters influence.Then, in a third step, an investigation of the processing parameters influence on the defect appearance is done using a pilot knife-over-roll coater, with both model and industrial pastes.Finally, correlations are established between defect appearance conditions, plastisol rheology and thermomechanical parameters of the flow between knife and roll for these different plastisol formulations. Different mechanisms of this defect development are proposed.
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Yamina Abdesselam. Rhéologie des plastisols et leurs procédés d'enduction. Polymères. PSL Research University, 2016. Français. ⟨NNT : 2016PSLEM039⟩. ⟨tel-01651033⟩

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