01-09-2014, 09:58 AM
Rotational Molding Advantages Molds are relatively inexpensive Rotational molding machines are much less expensive than other type of plastic processing equipment. Different parts can be molded at the same time. Very large hollow parts can be made. Parts are stress free. Very little scrap is produced
Rotational Molding Limitations Can not make parts with tight tolerance. Large flat surfaces are difficult to achieve. Molding cycles are long (10-20 min.) Materials Polyethylene (most common), Polycarbonate (high heat resistance and good impact strength), Nylon (good wear and abrasion resistance, good chemical resistance, good toughness and stiffness). Nominal wall thickness Polycarbonate wall thickness is typically between .06 to .375 inches, .125 inch being an ideal thickness. Polyethylene wall thickness is in the range of .125 to .25 inch, up to 1 inch thick wall is possible. Nylon wall thickness is in the range of .06 to .75 inch.