ENGSKO United Milling Systems combines the know-how of several Danish companies and have long experience within grain handling and flour milling, from supply of single stone grinding mills to complete flour milling plants.2. Flour milling process Adopt 4 skin grinding, 7 core grinding, 1 grinding mill, 2 tail, 2 beat, 1 brush, 5 clear flour, 3 skin, 4 skin, 1 core grinding powder process. 3. Packing process Use quantitative automatic packing machine for weighting and packing the flour into bags. Stone Grinding Mills Features.