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Trilogy Plastics

Custom Rotational Molding

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Why Rotomold

Rotomolding: What It Is

Rotational Molding (often called rotomolding) is a cost-effective process of making hollow plastic parts of limitless size by tumbling powdered resins inside a heated mold. The combination of continual rotation, plus controlled heating and cooling within the mold, achieves a consistently uniform diffusion of plastic along the inside of the mold walls. Resins used in rotomolding include HDPE, LLDPE, and high-density polyethylene.

Rotomolding: The Benefits To You

The many advantages of rotomolding provide you with key “edges” in achieving your product performance goals and staying competitive within demanding markets.

The Production Edge

  • Suitable for both low volume and annual volumes of up to 100,000 parts.
  • Small or large part capabilities - from a few inches to 20 feet or more.
  • Hollow parts, enclosed pieces, and parts with openings, can all be achieved through rotomolding.
  • Faster tooling lead times enable quicker part-to-market capability.
  • Nearly stress-free parts because no external pressure is used during rotomolding.
  • Minimal cross- section deformation or warpage.
  • The uniformity of rotomolded wall thicknesses can be maintained to within ±10 percent – significantly better than other molding processes.
  • Ability to change part wall thickness with the same mold.
  • Good finish and surface detail of parts.

The Design Edge

  • Extreme freedom and flexibility in part design resulting in optimal finished part performance.
  • Complex geometries possible in a single seamless part.
  • Can be designed with double-wall construction for strength or urethane foam filling for additional strength or insulation.
  • Wall variation can be designed into the mold to create stronger parts due to thicker outer corners or other features.
  • Ability to use of molded-in graphics, metal inserts, reinforcing ribs, kiss-off ribbing and undercuts.
  • Multiple piece tooling enabling one-piece design freedom of complex shaped parts for elimination of post-molding assembly.

The Cost Edge

  • The rotomolding process is an economical method of producing seamless, one-piece, hollow parts with complex shapes and diverse sizes that would be costly or impossible to produce using other plastic processes.
  • Mold simplicity and relatively low operating pressures enable molds to be built using aluminum a less expensive and easier to manufacture material.
  • Family of molds make high volume production of part cost effective.
  • Can eliminate the need for secondary assembly.
  • Multiple parts can be molded as one and finished as several reducing both part and tooling cost.
  • Polyethylene is a low-cost resin.
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2290 W. Main St
PO Box 2600
Alliance, OH 44601
330-821-4700
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We are internationally recognized rotational molders specializing in high appearance, tight tolerance rotomolded parts and assemblies. Today Trilogy's lean manufacturing facilities are one of the most modern rotomolding plants in the industry.

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