Mainly suitable for quantitative packaging of powdery materials containing gas mixture materials (such as glutinous rice flour, corn starch, modified starch, gluten powder, tapioca starch, etc.) using fast, medium, slow, three-speed feeding method, high-speed AD processing technology , Anti-jamming technical measures, automatic error correction and compensation technology, accurate measurement, stable and reliable performance. According to the characteristics of different materials, the gas in the packaging material is extracted by means of air extraction