Why the moon cake baked out of the skin will crack it The surface will burst the moon cake skin outside will split with cracks

1, the moon cake skin, filling specific gravity 2:8. 2, the pie crust pressed into a flat round piece, wrapped into the filling, put into the mold, hand press flat compaction, so that the moon cake pattern is clear, and then knocked out of the mold, yards into the baking dish, the surface of the surface brushed or sprayed with water. 3, moon cake baking is divided into two: (1) baked until the surface is slightly yellow, out of the brush egg yolk liquid; (2) moon cake baked until the surface is golden brown, not green wall, not collapse waist. 4, furnace temperature, upper fire 220 degrees Celsius, lower fire 190 degrees Celsius. 5, quality requirements, the shape of the pattern is clear, full of full, the cake waist slightly convex, the cake surface is not concave, no hairy edges, cracks, leakage of filling, etc., skin and filling tightly. The skin is fluffy and soft, the sweetness is suitable, the skin is moist and bright, the bottom is light brown.