Overview

Chroma's Rotational Molding Laboratory developed the Foama-Bag™ concept to offer the rotational molder a technique for using micropellets, in the form of Foama-Spheres®, in appropriate molds to develop an inner layer of foam without the use of drop boxes or secondary injection methods. A pre-measured quantity of Foama-Spheres® is sealed in a polyethylene bag (the Foama-Bag™) which is placed in the mold along with the raw material to be molded as the exterior skin. At the appropriate time and temperature in the molding cycle, the bag breaks releasing the Foama-Spheres™.

For its innovation of the Foama-Bag™, Chroma earned the SPI Midwest Award of Excellence for Technological Advancement at the 30th Annual SPI Midwest Conference held June 9-11, 1999 in Galena, Illinois.

Product Trials

• Chroma is available to assist in developing customized bags and foam charges for your specific application, including molds with and without inserts

Advantages

• This method of providing internal structural foam for a rotomolded part is economical in all lot sizes.
• Bag size, construction and unitized quantities of Foama-Spheres® are custom developed for a specific application, delivering the precise weight of foam each and every time.
• Foam densities are available from 7-30 pounds/cubic foot.

Process

• The unitized Foama-Bag™ melts and the Foama-Spheres® blow later in the molding cycle, at an internal air temperature of 190°–210° C, after the sintering of the exterior skin has begun.

The Challenge

• Challenge Chroma to demonstrate how our commitment to EXCELLENCE IN COLOR can make a meaningful contribution to the success of your business.

Technical Specifications

• The product is application specific. Chroma carefully considers the combination of bag thickness, materials of construction and density of the foam when tailoring bags to meet the processing characteristics of a specific type of machine, mold and end product.