Polyurethanes Information

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A large proportion of flexible polyurethane foam is made in blocks, either discontinuously in simple boxes or in a continuous process known as slabstock foaming. In this process the raw materials, polyol, di-isocyanate, water, auxiliary blowing agents, catalysts, surfactant and other additives are metered continuously into an in-line mixer and the mixed reactants, still in liquid form, are poured into a continuous paper and/or polyethylene mould on a moving conveyor. In the paper mould, the liquids foam and expand to form a continuous block of foam. This block is cut into sections, stored for at least a day to cure and cool, and then cut in a variety of ways into the shapes required. The main uses for this foam are mattresses, furniture, automotive seating and textile laminating.