The process of Rotational Molding is a very unique process. Heat is used to melt and fuse plastic resin in a closed mold. Unlike most other plastic processes, no pressure is involved. The four-stage process includes loading the resin in the mold, heating and fusing the resin, and finally, cooling and unloading the mold. After the charged mold is moved into an oven, the mold is rotated simply upon a rotating two axes arm at a low speed. As heat penetrates the mold, the resin adheres to the mold's inner surface until it is completely fused. The mold is then cooled by air or water spray or a combination of both, while still rotating, thus lowering the temperature in a gradual manner. The mold is opened, finished part removed and the mold is recharged for the next cycle. A variety of materials are available. The most widely used is polyethylene. Other potential materials include plastisols, nylon, fluoropolymers, polycarbonate, polypropylene, polyurethane, elastomers, etc. With the Rotational Molding process, parts can be molded economically in a variety of shapes and sizes, many of them would be impossible to produce by any other process.
Rotational Molding Arm In Cooling Cycle!
Watch these parts take a 15# sledge hammer like its nothing!
Rotomolded Tornado Shelter Door FEMA 320/FEMA 361 testing
See the industry leading Granger ISS Storm Shelter go thru FEMA 320 and FEMA 361 testing using the SAME DOOR! How is that for Rotational Molding strength and durability!
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