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The decomposition of plastic is based on temperature and time

Update:25 Feb 2019
Summary:

To determine if the quality of the production can be ma […]

To determine if the quality of the production can be maintained throughout the production process, a simple formula for yield and plasticizing capacity can be used. Note that when injection moulding thin-wall or precision-tolerant products, the amount of shot and the amount of plasticization must match each other.

The decomposition of plastic is based on temperature and time. For example, a plastic will decompose after being exposed to high temperatures for a period of time; however, in a lower temperature environment, it will take longer to decompose. Therefore, the residence time of plastic in the shooting tank is very important.

The actual residence time can be determined experimentally by measuring the time required for the colored plastic to pass through the shooting tank. Please note that some plastics have a longer residence time in the shooting tank than is required for calculation because they can accumulate in In the shooting tank.

As a general rule, the residence time of a plastic on a particular injection moulding machine should be calculated. Especially when large injection moulding machines use less amount of shot material, the plastic is easily decomposed, which is not detectable from observation. If the residence time is short, the plastic will not be plasticized evenly; the retention time will be attenuated by the plastic properties. Therefore, it is necessary to maintain the same residence time.

Method: Ensure that the plastic input into the injection moulding machine has a stable composition, consistent size and shape. If there is any abnormality or loss of the parts of the injection moulding machine, it must be reported to the maintenance department.

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