Patent ID: 8470217
Filing Date: 2013-06-25
Classification: B29C,B29K,B29L,B60R,Y10T

Abstract:
1. A manufacturing method of foamed molding composed of a foamed molding obtained by heating and foaming of expandable resin beads filled in a mold, the method comprising filling expandable resin beads in a mold, forming three-dimensional permeable pores defining a volume porosity of 10 to 40% among foam cells by softening and fusing mutually adjacent foam cells on contact faces thereof, by heating the expandable resin beads at a sealing temperature of the expandable resin beads in the presence of heating steam, and sealing and cooling the foam cells while controlling the foaming amount by controlling a pressure so as to foam the expandable resin beads while maintaining a balance between an internal pressure of the expandable resin beads and an external pressure within the mold so that the expandable resin beads are mutually pressed while leaving a space mutually between the expandable resin beads and are sealed on contact faces thereof, thereby obtaining the foamed molding having a bending limit strength of at least 10N, wherein the heated steam filled in the mold is preliminarily displaced with air or wherein the heated steam filled in the mold is displaced with air while controlling the pressure.