| 摘要 |
Prodn. of a foamed plastic with a solid outer surface of a different plastic, by bringing a mixture of a plastic and a solid propellant onto a solid plastic moulding or preform or onto a preform of a mixture of a plastic and a solid propellant, bonding the mixture to a solid plastic pre-form and heating the side consisting of a prepellant contg. plastic to a temp. T1(S) above the melting range temp. DELTA Ts(S) of this plastic and thereafter heating the solid plastic side to a temp. T2(M) =the melting temp. range DELTA Ts(M) of the solid plastic. More esp. the temp. T2(M) is maintained below the fusion range temp. DELTATs(M). |
