| 摘要 |
PROBLEM TO BE SOLVED: To provide a foamed resin panel excellent in heat insulation efficiency. SOLUTION: At the point of time when starting to produce a skin layer 23 in the vicinity of a mold-molded surface of a thermoplastic resin R injected and filled from a gate 103a into the cavity 107 of a molding mold 101, a cavity volume is expanded to foam the thermoplastic resin R, thereby, such a duct constitution panel 11 that a skin layer 23 made of a solid layer which has a high resin density and is hard is formed over the whole surface to constitute a hermetically sealed space 27 on the inner part and, at the same time, a foamed layer 25 which has a number of voids and has a resin density lower than that of the skin layer 23 is integrally hermetically sealed in the hermetically sealed space 27 is provided. A gate remaining solidified material r1 which remains in the gate 103a and is solidified is cut off. In the periphery of a cut-off trace r2 of the gate remaining solidified material r1, a thick skin layer 23a which has the high resin density and is hard is disposed so that the hermetically sealed space 27 is intercepted from the open air. COPYRIGHT: (C)2011,JPO&INPIT |
