Shape memory foam material

A method of producing a shape memory foam material, comprising the steps of:

• impregnating a base foam material in a thermoplastic substance;
• heating and compressing said impregnated base foam material at a temperature the same as or higher than a softening temperature of said thermoplastic substance as well as less than a softening temperature of said base foam material;
• cooling down said impregnated base foam material while retaining the compressed state;
• and
• releasing the pressure after cooling.

A soundproof cover for an automobile engine, comprising a shape memory foam material including:

• a base foam material;
• and
• a thermoplastic substance impregnated in said base foam material and having a melting point lower than that of said base foam material,
• wherein said shape memory foam material is a composite material obtained by compressing said base foam material and said thermoplastic substance, and
• wherein a compressed state of said shape memory foam material is retained in a room temperature by a hardened product of said thermoplastic substance existing at least in the surface layer part thereof, and
• wherein the compressed state is released by is softening said hardened product of said thermoplastic substance by heating.