人妻夜夜爽天天爽三区麻豆av网站,久久精品国产久精国产,无码av无码天堂资源网,精品无码国产自产拍在线观看

So far, the most common technologies have been used are open mill mixing and internal mixer mixing, which are called non-continuous mixing. Based on the advantages of both open mill and internal mixer, we have designed the “screw mixing machine” in continuous mixing method and of high efficiency with the strong points as follow.