How to produce foam?

1. Expandable Polystyrene / EPS is PS Foam that use Pentane gas (C5H12) as the blowing agent. During the material production process called "Polymerization" the polystyrene resin granules impregnated with the blowing agent. EPS production processes begin in the pre-expansion process where the EPS bead will expand by the heat of steam usually 50 times in volume. Next step is molding process where expanded foam bead will be heated again with steam then they expand further until they fuse together, forming as foam products.

1.1 Shape molding machine that produce various shapes of foam products according to the molds such as icebox, helmet and packaging foam.

1.2 Block molding machine that produce block foam and sheet foam Expanded EPS foam bead contains 98% air per volume, only 2% is plastic. This make EPS foam very light weight, has low thermal conductivity because air is the best insulation, high compressive strength and excellent shock absorption. These properties make EPS to be ideal material for packaging and construction.

2. Polystyrene Paper (PSP) is a PS Foam which produced by extruding process as another plastic. Production process start when put polystyrene resin pellets into the extruder that heated by electric. Foaming process occur at the end of extruder where the blowing agent, butane (C4H10) gas react with the melt plastic then become foam. The melted polystyrene foam then extended as sheet then roll as paper roll, that is why commonly known as "Polystyrene Paper". The polystyrene foam sheet or polystyrene paper can be produced as many shape according to the mold by thermal forming process such as food tray, cups, bow, and food box.