| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a stable and energy-saving manufacturing method of a polypropylene resin foam molding, using a mold apparatus having a concave mold unit including a concave mold and a concave mold housing for holding the concave mold, with the concave mold being supported by the concave mold housing in a cantilever state.SOLUTION: Steam is supplied to the molding space filled with polypropylene resin pre-expanded particles to be foamed and fusion bonded in the manufacturing method of a polypropylene resin foam molding. On the occasion of fusion bonding, the manufacturing method of a polypropylene resin form molding includes: (A) performing first stage heating until reaching the steam pressure P1 to have a fusion bonding rate of the pre-expanded particles of 40% or more and 80% or less; (B) once reducing the steam pressure down to P2, which is lower than the steam pressure P1 reached in the first stage; and (C) once again heating until reaching the steam pressure P3, which is equal to or higher than the steam pressure P1 reached in the first stage heating and maintaining for a constant time period.</p> |
