Manufacturing method of skin for air bag door

A method for manufacturing a skin having a general portion and a defined portion defined by an annular groove formed at a part of the general portion, comprising:

• preparing a mold with a mold surface having an endless and annular wall protruding from said molding surface, wherein said endless and annular wall of the mold separates a general molding surface of said molding surface from a defined molding surface of said molding surface and is formed at a predetermined angle relative to said general molding surface and said defined molding surface;
• forming a coating on said molding surface including an annular groove portion of substantially U-shaped cross-section formed over said endless and annular wall of said molding surface, a general portion formed on said general molding surface of said molding surface located outside said endless and annular wall of said molding surface, and a defined portion formed on said defined molding surface of said molding surface enclosed by said endless and annular wall of said molding surface, and having a height difference between a surface of said general portion and a surface of said defined portion, said annular groove portion having a step between said general portion and said defined portion;
• separating said coating from said molding surface;
• separating said general portion and said defined portion by cutting a bottom portion of said annular groove portion followed by removing said height difference between said surface of said general portion and said surface of said defined portion by relatively shifting said general portion and said defined portion, thus eliminating said step in said annular groove portion between said general portion and said defined portion and thus forming said skin.

A method for manufacturing a skin having a general portion and a defined portion defined by an annular groove formed at a part of the general portion, comprising:

• preparing a mold with a mold surface having an endless and annular wall protruding from said molding surface, wherein said endless and annular wall of the mold separates a general molding surface of said molding surface from a defined molding surface of said molding surface, and wherein said endless and annular wall of said mold surface includes protrusions on either side of said endless and annular wall;
• forming a coating on said molding surface including an annular groove portion of substantially U-shaped cross-section formed over said endless and annular wall of said molding surface, a general portion formed on said general molding surface of said molding surface located outside said endless and annular wall of said molding surface, and a defined portion formed on said defined molding surface of said molding surface enclosed by said endless and annular wall of said molding surface, and having a height difference between a surface of said general portion and a surface of said defined portion, said annular groove portion having a step between said general portion and said defined portion;
• separating said coating from said molding surface;
• separating said general portion and said defined portion by cutting a bottom portion of said annular groove portion followed by removing said height difference between said surface of said general portion and said surface of said defined portion by relatively shifting said general portion and said defined portion, thus eliminating said step in said annular groove portion between said general portion and said defined portion and thus forming said skin.