How are polymers moulded?
Channel: MechanicaLEi
Date: 2017-02-01

How are polymers moulded?
Find out the basic definition, types and applications of Polymer's Moulding in this exciting video!  Thanks again for watching!

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How Polymers Moulded?
polymer molecule composed many repeated subunits. Based on Mechanical Response High temperatures, Polymers classified major categeories: First ThermoPlastic Polymers, soften heated harden cooled down. polymers repeatedly moulded required shapes. thermosetting polymers.polymers become heating permenantly harden cooled.hard, brittle heat resistant compared thermoplastic Polymers. moulding , step moulding polymers Processing polymers, polymers simlar used shape metals. look: Processing Thermosetting Polymers done by using methods. One being Compression Moulding measured amount polymer powder placed female cavity that preheated degree celcius. upper half die compresses material with a pressure 0.550 Mega Pascals. This pushes material mould cavity where solidifies removed help ejector pins. Advantages include, Low residual stress, low setting time good surface finish. Disadvantages include increased overall cycle time low production rate. Compression Moulding used for making gears, buttons, knobs, handles, dishes fittings. Another type thermosetting plastics processing Transfer Moulding: Whichan advanced method compression Moulding. material generally pre-heated placed lower half mould. upper partdie applies pressure 20 100 Mega Pascals once cured material part ejected. One Main Advantages Transfer Moulding ability insert different inserts like semiconductor chips, ceramics etc before introducing material. But limited by its high equipment cost wastage material. Transfer Moulding used manufacture electronic components moulded terminals, pins, etc.comes Moulding ThermoPlastic polymers studied three parts. One being  Injection Moulding. Here, material fed from hopper rotating screw which discharges material front  extruder. Heat deveoped from electric band heaters friction from rotating Srew. Advantages Injection  Moulding include faster production rate, Production complicated shapes high accuracy but limited by high initial  cost. Applications production cups, chairs, toys, car parts etc. line blow moulding processair pressure used inflate plastic mould cavity. plastic called parison, gripped between piece mould. air pressure 400800 kilopascals.