Aislamiento de espuma
What is Foam Insulation?
Rotational molding is often used for making hollow containers that require insulation. Insulated rotationally molded parts are typically designed with a “Double walled” architecture to create the cavity for the insulation. Double walled construction adds some complexity to the part design process. The best example of an insulated rotomolded part is a high-end plastic cooler. The inside of the cooler is created by a “core” which creates the cavity and inner wall. One design challenge with double walled is accommodating for the large amount of draft required on this core for moldability. The deeper the cavity, the more draft required. Undercuts within the cavity should also be avoided. Another challenge can be creating the space needed for insulation to flow between the walls. We have lots of experience with designing and molding double walled parts and are ready to help you with your double walled project regardless of what stage you are at.
The Process
Once a part is designed and molded, it is time to apply insulation. We use an expanding urethane foam insulation that is the industry standard for coolers, refrigerators/freezers, and more. The expansion of the foam provides for an extremely dense application and consequently better thermal performance. Foaming fixtures must be used to prevent warping of the plastic part from foam expansion during the foaming process. Adhesion of the foam to the plastic is also extremely important for part quality. We use an ozone treatment process to chemically treat the surface of the plastic before foaming which greatly increases the adhesion between the foam and the plastic. A lack of adhesion can cause the plastic walls of the part to move away from the solid foam and look warped. The ozone treatment process is the best way to avoid this and another reason why we are the best partner for your foam-insulated, rotomolded part project.
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