Interior automotive trim part and process for producing the same

An interior part for automobiles made of a thermoplastic resin, said interior part comprising:

• thermoplastic resin comprised of a mixture of polyolefin resins comprising:
• a propylene homopolymer having a specific gravity of not more than 0.93, exhibiting a melt flow rate of 0.3 to 3.0 g/10 minutes
• and exhibiting a bending modulus of not less than 1400 MPa;
• a crystalline propylene block copolymer having a specific gravity of not more than 0.93, exhibiting a melt flow rate of 0.3 to 1.5 g/10 minutes and exhibiting a bending modulus of not more than 1250 MPa and a high density polyethylene having a specific gravity of 0.925 to 0.965 and exhibiting a melt flow rate of not more than 0.5 g/10 minutes and comprises a hollow double-wall structure including front and back walls opposed at some intervals, a rib integrally welded on its inner face of a hollow part side of said respective front and back walls being formed in between the front and back walls, wherein said mixture of said polyolefin resins is produced by blending 40 to 80 wt % of said propylene homopolymer, 10 to 40 wt % of said crystalline propylene block copolymer and 10 to 40 wt % of said high density polyethylene, and a main component is comprised of said propylene homopolymer.