| 摘要 |
PURPOSE:To strengthen boding power of foam parts whose foam magnifications are different from each other with simple facilities and a process and variable setting of strength of an arbitrary part is made easy further, by a method wherein a plurality of foaming materials whose foam magnifications are different from one another are filled into the same space at the same time through respective casting ports provided in the same mold and heating, foaming and cooling are performed at the same time. CONSTITUTION:Corner parts A of cushioning bodies 20 fitted to edge parts each of a product 10 to be packed up and the remaining part B are constituted respectively of foaming polyethylene (forty foam mangnifications) superior in shock resistance and durability and foaming polystyrene (fifty foam magnifications). The foaming polyethylene and foaming polystyrene are filled into confronted molds 30, 31 at the same time through material introducing pips 32, 33 piped respectively to casting ports provided in the molds 30, 31. Two kinds of foaming materials are dispersed freely in the same space in the molds 30, 31 and their contacting surface becomes a random uneven state where bonding power is strong. Steam is applied to the materials through a steam introducing pipe 34, they are heated and foamed at the same time, they are moved by cooling them at the same time through cooling of the molds 30, 31 and the above-mentioned cushioning body 20 is molded. |
