RotationalMoldingSupplemental - Rotational Molding Load...

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Rotational Molding Load polymer powder into cold mold and rotate rapidly to pack powder onto mold walls. Then heat to fuse powder particles together (sintering). Figure 1: Diagram of a four-station rotational molding operation. 1. Load and Rotate to Pack Powder 2. Heat to Sinter Powder 3. Air Cool 4. Water Cool 5. Unload back at Station 1 1
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Rotational Molding ROTATION TO PACK POWDER Figure 2: Mold and rotating mechanism for rotational molding. Proper design of gimbal for rotation in two directions ensures polymer powder is uniformly packed on interior surface of the hollow mold. 2
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Rotational Molding SINTERING Figure 3: Schematic of the sintering process. 3
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Rotational Molding FRENKEL MODEL OF SINTERING Define our measure of the interparticle contact as X , the radius of the circle of contact between two spherical particles. X = a sin θ Figure 4: Interparticle contact. Early Stage: X 2 a 0 = 3 2 γ η t γ is the surface tension η is the zero shear rate viscosity Late Stage: da dt = 3 4 γ
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This note was uploaded on 08/18/2011 for the course MATSE 447 taught by Professor Colby,r during the Spring '08 term at Pennsylvania State University, University Park.

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RotationalMoldingSupplemental - Rotational Molding Load...

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