PROCESS FOR THE PREPARATION OF A BLOCK OF POLYURETHANE / POLYISOCYANURATE FOAM FROM A THERMAL INSULATION MASSIF OF A TANK

摘要

The present invention relates to a preparation of a block of fibered polyurethane / polyisocyanurate foam in which the expansion of the foam is constrained by the walls of a double strip laminator forming a tunnel, the block of fibered polyurethane / polyisocyanurate foam being composed of cells storing a gas, advantageously of low thermal conductivity, and having a density of less than 50 kg.m-3 with a rate of Tf fibers representing at least 4% by mass of the block of fiber foam, in which the time of Impregnation of the fibers ti is less than the cream time tc of the polyurethane / polyisocyanurate foam. Figure to be published: 1