Dough mixing machine section is mainly used for mix the material from the dosing system, especially for the sponge and dough process.All ingredients must be uniformly and evenly incorporated in a consistent mass and transformed into a dough which can be processed by the next set of machines. Normally two kinds of biscuit corresponding two types of biscuit dough mixer, horizontal mixer for soft biscuit, vertical mixer for hard biscuit.
1.Horizontal mixing process must not develop the gluten in the flour, as this will result in a hard biscuit. Mixing is therefore done in two stages. In the first stage, all the ingredients are mixed except the flour and soda. The mixing continues until a consistent, homogenous cream is produced. It is important to keep the temperature of the dough low and chilled water is required for the mixer jacket.For the second stage,the flour and soda are added and mixed for 1minture at slow speed and 1-2minutes at high speed. The final dough temperature should be 18-22℃。
2.The sponge and dough are usually mixed on vertical spindle mixers.The yeast should be dispersed in water before feeding to the mixing bowl. The dough is mixed to the temperature of 30-35℃, which is the optimum temperature for the action of the yeast.The sponge is fermented for specific time at the specific temperature(according to the biscuit). During this time the PH value of the dough will increase. After the fermentation of the sponge, the dough trough is taken bake to the mixing room.Times of the fermentation according to the type of biscuit.