In spin casting, the liquid polymer is injected into a ___.

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Multiple Choice

In spin casting, the liquid polymer is injected into a ___.

Spin casting relies on centrifugal forces as the liquid polymer is injected into a mold that is turning. The spinning mold uses rotation to push the molten polymer outward and evenly fill the cavity, creating the lens shape with the proper curvature. This spinning action also helps achieve uniform thickness and reduces air pockets, which is essential for a smooth, accurate lens. The term spinning mold directly reflects this key aspect of the process, whereas a generic mold or a non-spinning setup wouldn’t capture the necessary rotation that drives filling and shaping in spin casting.

In spin casting, the liquid polymer is injected into a ________ ___________.

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