Sandwiching unit is the most important part of biscuit making machine. The basic function of sandwiching unit is to make the biscuit dough into biscuit shape. It also provides a smooth surface for biscuit and helps to reduce the cost of biscuit making process. In sandwiching unit, there are two rollers: upper roller and lower roller. The upper roller is called top roll and lower roller is called bottom roll. The top roll has a hole in it, which is called mold hole. After the dough is processed by the upper and lower rollers, it will come out from the hole.