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Specific Gravity Of Polymers

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ROTATIONAL MOULDING MACHINE

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  ROTATIONAL MOULDING INTRODUCTION ·          Rotational molding is a process of making hollow articles. ·          The part is formed inside a closed female mold. ·          In this process the mold rotates biaxially during heating and cooling cycle. ·          Rotational molded pieces are stress free because the pieces are produced without any external pressure. ·          The ability to manufacture large containers of capacity 30,000 gallons as well as small items like golf ball is responsible for the growth of this process. ·          The Process requires relatively in expensive equipment and exerts on only small pressure on the material being formed. PRINCIPLE ·          The principle of the process is that finely divided plastic material becomes molten when comes in contact with hot metal surface of the mold and takes up the shape of that surface. ·          As only female mold is used, the only pressure exerted is those induced by gravity and centrifugal forc
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Melting Points Of Plastics

Melting Point The melting point of a substance ( Polymer ) is the temperature at which it changes state from solid to liquid. 1. Polyolefins Polymer Abbreviation Melting Points ( ° C)     Low density polyethylene LDPE 110 High density polyethylene HDPE 130 Linear low density polyethylene LLDPE 125 High molecular high density polyethylene HMHDPE 135 Ultra high molecular HDPE UHMHDPE 130 Polypropylene PP 160 2. Chlorinated Polymers Polymer Abbreviation Melting Points  ( ° C) Poly vinyl chloride PVC  160-220 Poly vinyledene chloride PVDC 190-200 Chlorinated PVC PVCC 200-210 Co-polymer of vinyl chloride & vi
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