Optimization of Molding Process of Daqu’s Multi Position Press

Abstract

Daqu is a saccharifying agent, starter culture agent and aroma generating agent in the process of liquor brewing. The quality of Daqu directly affects the quality of liquor. In order to find the Daqu’s optimal molding process parameters during the pressing process of Daqu’s multi position press, this paper deployed area ratio of surface pulping and the uniform factor of internal moisture content of Daqu as evaluation indexes. Surface response experiment studied the influence of three factors of different pressing speed, stepping times and forming times on Daqu，s pulp extraction effect and moisture content uniformity. The research results showed that the impact of each process parameter on the pulping effect of Daqu ranked as follows: Stepping times>forming times>pressing speed. The influence on the uniformity of Daqu water content was pressing speed>stamping times>forming times. The best process parameters were: Pressing speed (A)=20 mm/s, times of trampling (B)=20, and times of molding (C)=7. Under the conditions of the process parameters, the Daqu obtained by pressing Daqu showed that the effective area ratio of pulping was 85.66%, and the uniformity factor of water content inside Daqu was 6.37. The thesis provided productive and practical technical support for the standardization and industrialization of liquor Daqu pressing production.

Keywords

• daqu molding
• process parameters
• pulping effect
• moisture content