Polyme r melt temperature t m c mould temperature

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Polyme r Melt Temperature, T m ( °C) Mould Temperature Range T w ( °C) Linear Mould Shrinkage (%) Tensile Strengt h (MPa) Melt flow (g/10min) Injection Pressure (MPa) TPE 193– 235 24 °C – 66 °C 0.4% to 1.5% 14.0 0.010 to 13 35 to 150 Table 1: Thermoplastic elastomers (TPE) Injection Moulding Processing Injection moulding machine consists of three sections; injection unit, mould assembly and clamping unit. Raw plastic material is placed inside hopper before transferred into the injection unit. Function of the hopper is to dry the raw material according to its temperature. The injection unit consists of a barrel and injection screw. Raw plastic material for the part is fed into a heated barrel, mixed (using a helical shaped screw), and will injected into a mould cavity, where it cools and hardens to the configuration of the cavity.
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In order for the molten plastic to flow into the mould cavities, several channels are integrated into the mould design. First, the molten plastic enters the mould through the sprue. Additional channels, called runners, carry the molten plastic from the sprue to all of the cavities that must be filled. At the end of each runner, the molten plastic enters the cavity through a gate
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