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In a caffeine extraction experiment using DCM, why is necessary to do the recrystallization step if...

In a caffeine extraction experiment using DCM, why is necessary to do the recrystallization step if caffeine was already collected after evaporating DCM.

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When DCM is evaporated, you get only the crude product which might also have impurities in it. Hence recrystallization is performed in suitable solvent in which caffeine is sparingly soluble in cold condition and completely soluble in hot condition while the impurities are completely soluble in the solvent. This helps in removing the impurities from the crude product and finally you end up with a pure caffeine as a product  

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