7/29/2008

Rotational Molding

Rotomolding

9/22/2010

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This is the www.maropolymeronline.com website. Links to recent articles and patents are kept here until they can added to the SPE Encyclopedia on the SPE server. (Roger D. Corneliussen, 8/20/2010)

If the US Patent link doesn’t work, click on US Patent Number Search and enter the patent number in the search box. The date is the patent publication date.

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The rotational molding process is a high temperature, low pressure plastic forming process that uses heat and biaxial rotation (i.e. rotation on two axes) to produce hollow, one piece parts. It generally consists of plastic powder in a large mold, closing the mold, rotating through at least two independent axes, heated while rotating, fusing the resin powder, cooling, stopping rotation and removing the product. Although the cycles times are very long, the molds are easy and cheap to build and the process is especially good for very large hollow structures.

RDC, 8/11/2008

Foams

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Roger D Corneliussen
Editor
Telephone: 610 363 9920
Fax: 610 363 9921
Email: cornelrd@bee.net
SPE Online Encyclopedia
www.maropolymeronline.com

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Blow Molding

Extrusion

Injection Molding

Warning: Sometimes the older links no longer work. Go to the US Patent number search page, copy the Patent number into the search box and search. For the articles, use your browser to go the Journal site.

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Notes

“More than 80% of all the material used is from the polyethylene family. Cross-linked polyethylene (PE); linear low density polyethylene (LLDPE); high density polyethylene (HDPE). Other compounds are PVC plastisols, Nylons, and polypropylene.”

Wikipedia: http://en.wikipedia.org/wiki/Rotational_molding

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Review Articles

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US Patents

7/29/2008

7,404,580
Hollow structure formed by rotational molding and method of manufacturing same

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Journal Articles

10/31/1008

Influence of surface treatment on hybrid wollastonite-polyethylene composite resins for rotational moulding
(6057-6063) Journal of Materials Science 43 #18 (2008)

9/19/2008