10 Oct '11, 3pm

MANUFACTURING WITH SOLAR ENERGY.: by Bruce Mulliken, Green Energy News On spare rooftop space, or on a large sun...

MANUFACTURING WITH SOLAR ENERGY.: by Bruce Mulliken, Green Energy News On spare rooftop space, or on a large sun...

Rotational molding of plastic starts by putting loose, plastic pellets in the mold and closing it up. The mold is then heated with a conventional source of energy, like natural gas, until the pellets inside melt to a liquid. Kept hot, the mold is spun or turned about until the liquid plastic reaches all the nooks and crannies of the inside surface of the mold covering it all in a uniform thickness. (The time needed to do this varies and is part of the experience curve of the manufacturer.) When the fluid plastic has fully coated the inside of the mold the heat source is turned off, but the mold keeps moving until the plastic cools and hardens sufficiently inside. Then the product is removed and the process started again.

Full article: http://www.green-energy-news.com/arch/nrgs2011/20110075.html

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