Surface Improvement of One Step Rotational molding Products

Abstract

The purpose of this research project is to improve the surface finish of the work piece more softly than the use of linear low density polyethylene (LLDPE) as used in the general rotational molding industry by  a single step to obtain a double wall using two different materials (Double Walls from One Step Process). The outer layer is a rubber-like material, which is used in this research to use materials in Thermoplastics Elastomer (TPE) and Ethylene Vinyl Acetate (EVA) in three different types that can be molded by rotational molding while the inner layer is a commercial grade LLDPE for rotational molding. Both types of plastics will be added to the mold at the same time. Then, when heating the mold while rotating it should be possible to separate the layers of the two materials, which is a process without any special tools or procedures. Just use the normal steps to mold in the general rotational molding. Based on the difference properties of flow as solid and melt state within the mold during processing. The results showed that it can be completely molded when the ratio of LLDPE and EVA is 64:36 % by weight.