Optimal Mixing Time for Feed Mixers

In the feed production industry, achieving a uniform mixture of components is paramount to ensuring high-quality outputs. This uniformity is not just beneficial for the quality of the feed but also impacts the overall efficiency of the production process. Central to achieving this is the optimization of the mixing time in batch mixers, a component that significantly influences the homogeneity of the final product.

Defining Key Factors：

1. Mixing Uniformity: The degree to which different components are distributed evenly within the feed product.
2. Mixing Time: The duration from the point all materials are added to the mixer until the mixing process is concluded.
3. Optimal Mixing Time: The shortest duration required by a batch mixer to achieve the minimum or predetermined coefficient of variation in mixing uniformity.
4. Coefficient of Variation for Mixing Uniformity: A variance indicator expressed as the relative number of mixing uniformity.

Overview of the Mixer Model

The SJHS series double-layer high-efficiency mixer by a leading group is the focal model. This machine is an advanced version of the typical single-shaft paddle mixer prevalent in feed factories. It features dual layers of paddles—four large ones at special angles on the exterior and four smaller ones internally, enhancing the mixer’s efficiency.

Main Features

The SJHS series mixers boast short mixing cycles and high uniformity. Generally, the material achieves a coefficient of variation (CV) of less than or equal to 5% within 45 to 60 seconds, with this model achieving an impressive 2% to 3% CV.

Experimental Methodology

To determine the optimal mixing time, various durations were tested according to national standards (JB/T 11689-2013 and GB/T). These included intervals from 30 seconds up to 165 seconds. At each specified interval, 10 samples were collected from the mixer without any additional mixing or stirring during sampling.

Results and Observations

The testing outcomes highlighted two machines with optimal mixing times identified at 105 seconds and 75 seconds, respectively. These times were determined based on the earliest occurrence of a CV that met the regulatory requirements for both dry and wet mixing.

Conclusion

From the data gathered and the empirical experiences in various production environments, it is evident that selecting the right mixing time is crucial. This selection is based on achieving the necessary uniformity as early as possible without compromising on quality over different operational conditions. Future studies will aim to delve deeper into the relationship between mixer models, recommended national standards, and the intervals between tests to refine and optimize the mixing process further.

This analysis underscores the importance of meticulously choosing the mixing time to balance efficiency and product quality, ensuring feed manufacturers can consistently produce superior feed while minimizing waste and operational costs.