Patent ID: 6013329
Filing Date: 2000-01-11
Classification: B29C,D06N

Abstract:
A process for manufacturing a flat composite plastic structure, said plastic structure comprising a textile web made of yarns or fibers and at least one layer of a thermoplastic impregnating said textile web on one of its sides, said process comprising:coating the textile web with at least one layer of a plastisol, said plastisol comprising said thermoplastic dispersed in a volatile organic fraction comprising a plasticizing agent, so as to obtain on said textile web said layer in the liquid or pasty state; andtransporting said textile web coated with said at least one layer of plastisol through an oven for gelling the plastisol, said oven comprising an infra-red gas burner radiating heat towards said at least one layer of plastisol, so as to remove said volatile organic fraction of the at least one coated layer and to cause the plastisol to gel;wherein the improvement comprising controlling the gelling conditions of the plastisol by (i) selecting a catalytic burner as the infra-red gas burner, said catalytic burner comprising a refractory porous structure supporting a combustion catalyst and having a radiant surface, and (ii) flowing a stream of preheated air as a co-current over said textile web coated with said at least one layer of plastisol, so as to ensure contact of the preheated air with said at least one layer of plastisol and said radiant surface of said catalytic burner.