In cryoextraction, this is done to grapes to produce the most concentrated juice in pressing
When grapes are frozen and 
then pressed, a more concentrated juice is obtained because... [DOC] [TLE] The Two Faces of Ice Wine Production - Wines & Vines [PAR] In each case the frozen grapes yield high-sugar, high-acid juice that is difficult to 
... before pressing; the grapes on top soften and release their juice more easily.