Joint structure for a partial foaming part of an instrument panel

In a joint structure between a core layer 2 and a skin layer 3 for manufacturing a partial foaming part 1 of which a polyurethane foam layer 4 is formed between the core layer 2 and the skin layer 3, characterized by comprising:

• a partial end portion 34 being curved inwards from an inner side surface of the core layer 2 within the polyurethane foam layer 4 at a front end of the skin layer 3 that is correspond to a joint part between the core layer 2 and the skin layer 3;
• a skin end portion 35 upwardly extending from an end of the partial end portion 34 and being pressed against the core layer 2 due to foaming pressure of the polyurethane foam layer 4;
• and
• a foam leakage-preventing protrusion 22, for preventing a polyurethane foam from being leaking, protruding from the inner side surface of the core layer 2 which is correspond to the joint part between the core layer 2 and the skin layer 3, the foam leakage-preventing protrusion 22 being contacted with the partial end portion 34 of the skin layer 3;
• wherein a foam staying space 36 is provided between the foam leakage-preventing protrusion 22 and the skin end portion 35.

In a joint structure between a core layer 2 and a skin layer 3 for manufacturing a partial foaming part 1 of which a polyurethane foam layer 4 is formed between the core layer 2 and the skin layer 3, characterized by comprising:

• a partial end portion 38 being curved inwards from an inner side surface of the core layer 2 within the polyurethane foam layer 4 at a front end of the skin layer 3 that is correspond to a joint part between the core layer 2 and the skin layer 3;
• a foam leakage-preventing protrusion 24, for preventing a polyurethane foam from being leaking, protruding from the inner side surface of the core layer 2 which is correspond to the joint part between the core layer 2 and the skin layer 3, the foam leakage-preventing protrusion 24 being curved with corresponding to the shape of the partial end portion 34 of the skin layer 3;
• and
• a groove 25 for providing a foam staying space therein being formed at the inner side surface of the core layer 2 below the foam leakage-preventing protrusion 24.

In a joint structure between a core layer 2 and a skin layer 3 for manufacturing a partial foaming part 1 of which a polyurethane foam layer 4 is formed between the core layer 2 and the skin layer 3, characterized by comprising:

• a partial end portion 38 being curved inwards from a front portion of the skin layer 3 at a front end of the skin layer 3 that is correspond to a joint part between the core layer 2 and the skin layer 3;
• and
• a foam leakage-preventing protrusion 24, for preventing a polyurethane foam from being leaking, protruding from an inner side surface of the core layer 2 which is correspond to the joint part between the core layer 2 and the skin layer 3, the foam leakage-preventing protrusion 24 being curved with corresponding to the shape of the partial end portion 38 of the skin layer 3;
• wherein a foam staying space 40 for introducing the polyurethane foam therein is provided between the foam leakage-preventing protrusion 24 of the core layer 2 and the partial end portion 38 of the skin layer 3.