Foam resins suppliers

Foamed PP is a new alternative material for processors of PP or PS thermoformed items for packaging applications. The joint R D programme of Italproducts, Reedy International and PP resin suppliers has made it possible for everybody involved in the packaging industry to install and run an extrusion and thermoforming line capable of producing medium density EPP items. The features of the equipment required are described. ITALPRODUCTS SRL REEDY INTERNATIONAL CORP. 

For example, in profile foam operations, where higher density foams are desired, it is general practice to use chemical blowing agents (CBA). These materials, which decompose under polymer melt processing conditions to yield gases to expand the polymer, are usually dry-blended with the resin and then fed to the extruder. They can also be compounded directly into the resin by the polymer supplier and provided as a ready-to-use masterbatch. 

Both the polystyrene and the epoxy resin were obtained from commercial suppliers in the pre-foamed condition. The foam material resulting from the manufacturing process has closed cells in the case of the polystyrene, but the epoxy foam is porous. These structures result in somewhat different thermal performance for the two types of material as found previously by Schrodt et al. ... 

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