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March 1, 2006

2 Min Read
Automated rotomolding system

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A new technology to manufacture multiple-layer rotationally molded products uses the company?s Leonardo fully automated rotational molding system. This new capability allows designers to produce products with layers of material, each providing different properties and benefits. The outer layer could provide a high level of UV and impact resistance; the center layer might be insulating polyurethane foam.

The machine fully automates the injection of additional resins and blowing agents during the molding cycle. The precise heating of the mold allows the molder to control the wall thickness of each layer. A product can now be designed and manufactured with specific areas of increased wall thickness for additional strength, rigidity, or insulation. The rotational molding process is the best method to produce hollow products with complex geometries and superior impact and tensile properties. Due to the equipment and labor-intensive processing method, rotational molding has predominantly been used for low-volume, low-tolerance products.

The system has oil heating and water cooling directly on the mold, instead of a large oven in which the mold rotates bi-axially. This is said to improve energy efficiency, and the oil can be heated either by gas or electricity, depending what is most readily available or cost effective. With oil heating, the mold can be either heated to a consistent temperature or different zones can have more or less heat applied resulting in precise control of product wall thickness from highly uniform to highly varied. A product/mold can now be designed with double the wall thickness in a particular area to provide structural strength and durability. By designing products with reinforcing zones, required material and part weight can be greatly reduced.

Persico SpA, Nembro, Italy
+39 035 4531 611; www.persico.com

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