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30.  Hot runner manifold system, which has valve or pinpoint gates – operate through hydraulic, pneumatic, or electric actuation.

6.    Mold protection that we discussed in class for a plastic injection mold, which is a type of protection used in the industry.

24. Undercuts are depressions or recesses on injection molded parts that complicate the demolding or even make it impossible in extreme cases.  Auxillary parting planes can be generated with sliders to release partial molded part areas that have an undercut in the demolding direction.

28.  Hot runner is an extension of the injection unit.  They keep the plastic at a liquid (molten) state up into the mold cavity.

20.  If you vented 30% of the perimeter of the plastic injection mold and are still have burns on your plastic part, you could vent the ejector pins for additional vents (good thing about venting ejector pin, they are self cleaning).    

11.   What fluid is used for cooling passages in plastic injection mold to control temperature. 

29.  The biggest advantage of a Hot Runner Mold is waste free (no runner).

Bonus 1   Why do they surface grain or etch a plastic injection mold, what is the purpose?

7.  Date grids or codes are important on a plastic part that is used in a car, in case of a recall, they can isolate suspect parts.

19.  The correct vent depths for the following plastics recommended by material supplier     – ABS   .001-.0015″     – PP    .0005-.0012″     – Glass Filled Nylon  .001-.0025″