| 摘要 |
PURPOSE:To obtain a great deal of economic effect by enabling foam molding within a mold without performing the operation of applying inner pressure to prefoamed particles, by making use of specific propylene series resin prefoamed particles. CONSTITUTION:Prefoamed particles possesses the two fusion points by measurement based on a differential scanning calorimeter method (DSC method), and the title prefoamed particles are propylene series resin prefoamed particles whose fusion peak quantity of heat QH based on a high-temperature side fusion point out of the two fusion points is 0.5-2.3cal/g. Then it is preferable that a difference between the two fusion points is 15-25 deg.C from a view point where it becomes that fusion at the time of heating for molding it apt to occur. In the case where the fusion peak quantity of heat QH based on the high-temperature side fusion point falls within a range of 0.5-2.3cal/g, foam molding within a mold becomes possible without performing the operation of applying inner pressure. Manufacturing is performed in the manner that, for example, a water-dispersed thing is discharged into a low-pressure sphere after heating of the same up to the predetermined foaming temperature under pressurization by containing a volatile foaming agent in propylene series particles within a pressure vessel. |
