-Nozzle type conductors Him: simple design. Low cost. Cons: Not to be preferred because of freezing spray mouth in plastic. Requires the quick cycle to maintain the flow state. Long startup period to stabilise the temperature flow. A problem about the ability to fill out the product. -Nozzle inside the heat:Pros: increasing the temperature distribution. Disadvantages: higher costs and a more complex design Requires balancing difficult complex temperature control khănvà. To calculate thermal expansion with other details of the mold. -External heat nozzle Pros: increasing the temperature distribution. Better temperature control. Disadvantages: high cost and design complexity. To calculate the thermal expansion with other details in the mold.
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