Mechanical device (also crushing mill) for crushing grapes. When making red wine, it becomes the mash for the maceration generated, therefore the process is also called mashing. In the White wine this is done immediately before Press, The grapes are squeezed between two spiked rollers so that the juice can escape more easily when pressed. It also will enzymes. Extract- and flavorings released. The kernels and (if they still exist) stems should not be injured if possible to prevent the bitter and unpleasant tasting tannins to prevent that are particularly contained in green stems. The alternative squeezing process takes place after one if possible stemming, whereby the stripping machine used for this is often coupled with the grape mill.