In your attempt to mold a part in shorter molding cycles, you have been lowering the temperature of the mold using chilled water. You find that the strength of the acetal part has decreased significantly under the cooler mold conditions. What is the cause of the problem?
What will be an ideal response?
The strength of an acetal part relies greatly on its crystallinity. The crystalline areas form as the part cools. While still warm the amorphous regions of the part have enough energy that they can move locally and form into crystalline areas. When the speed of cooling is increased, there is less time for these various crystalline areas to form. The parts will maintain an amorphous nature.
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What will be an ideal response?
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What will be an ideal response?
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