关键词: 颗粒饲料, 长径比, 含水率, 极限强度, 含粉率, 响应曲面

Abstract: In order to explore the mechanical properties of pellet feed, this paper took 3 types of formula feed produced by feed industry for pig, poultry and fish as experiment samples, and conducted axial compression, radial compression and shear tests, respectively. Under the 3 different test methods, the ultimate strength of aquatic formula feed was the highest, followed by poultry compound feed, and pig formula feed was the lowest. With the increase of aspect ratio, the ultimate strength of radial compression and shear did not change much, and the ultimate strength of axial compression tended to decrease with the increase of aspect ratio. With the increase of moisture content, the ultimate strength of pellet feed increased first then decreased, and the ultimate strength had the maximum value. Feed category, test method and moisture content had significant effects on ultimate strength. Adopting Design-expert response surface method, this paper obtained the response surface relationship among target load, dwell time and powder content rate. The results showed that there was a linear relationship between the powder content of pellet compound feed, payload and dwell time. The payload and dwell time had a significant effect on powder content, and the effect of payload on content of powder was more significant than that of dwell time.

Key words: pellet feed, aspect ratio, moisture content, ultimate strength, powder content, response surface