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10 Rotational Molding Technology Table 1.2 compares the characteristics of the processes that can be used to make hollow plastic products. Table 1.2 ComparisonofBlowMolding,Thermoforming,andRotational Molding (Adapted from Ref. 41.) Factor Typical product volume range (cm3) Plastics available Feedstock Raw material preparation cost Reinforcing fibers Mold materials Mold pressure Mold cost Wall thickness tolerance Wall thickness uniformity Inserts Orientation in part Residual stress Part detailing In-mold graphics Cycle time Labor intensive Blow Molding 101ñ106 limited pellets none yes steel/ aluminum <1 MPa high 10%ñ20% tends to be nonuniform feasible high moderate very good yes fast no Thermo Forming 5×100ñ5×106 broad sheet up to +100% yes aluminum <0.3 MPa moderate 10%ñ20% tends to be nonuniform no very high high good, with pressure possible fast moderate Rotational Molding 101ñ108 limited powder/liquid up to 100% yes, very difficult steel/ aluminum <0.1 MPa moderate 10%ñ20% uniformity possible yes none low adequate yes slow yesPDF Image | INTRODUCTION TO ROTATIONAL MOLDING 1
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