A roller mill (10) for grinding material, an aspirating assembly (23; 23) and a method of retrofitting an existing roller mill. The roller mill (10) contains a grinding space (11, 11) for grinding material, a separating wall (17) separates the grinding space from an aspiration space (21, 21). At least one aspiration opening (13), is formed in the separating wall (17) through which aspiration air can flow due to a pressure difference between the aspiration space and the grinding space. The roller mill (10) has a closing element (14) for opening and closing the aspiration opening (13). The closing element (14) is in or moves into an opening position (O), which opens the aspiration opening (13), when the pressure difference exceeds a threshold value, and is in or moves into a closing position (S), which closes the aspiration opening (13), when the pressure difference falls bellow the threshold value.

A grain flour includes milled grains of at least one grain selected from the group consisting of barley and oat. In the grain flour, the average grain diameter is in the range of 40-100 m. The content of grains having a grain diameter less than 20 m is not greater than 20 mass %, the content of grains having a grain diameter in the range of 20-100 m is in the range of 20-60 mass %, the content of grains having a grain diameter greater than 100 m and not greater than 500 m is in the range of 20-60 mass %, and the content of grains having a grain diameter greater than 500 m is not greater than 5%. An application food using the grain flour is produced from a starting material which contains at least 5% of the grain flour. A method for producing the grain flour is also provided.

A grain flour includes milled grains of at least one grain selected from the group consisting of barley and oat. In the grain flour, the average grain diameter is in the range of 40-100 m. The content of grains having a grain diameter less than 20 m is not greater than 20 mass %, the content of grains having a grain diameter in the range of 20-100 m is in the range of 20-60 mass %, the content of grains having a grain diameter greater than 100 m and not greater than 500 m is in the range of 20-60 mass %, and the content of grains having a grain diameter greater than 500 m is not greater than 5%. An application food using the grain flour is produced from a starting material which contains at least 5% of the grain flour. A method for producing the grain flour is also provided.

The present disclosure provides processes for the production of protein and fibre compositions from brewer's spent grain. The process comprises micronising dried brewer's spent grain using a pin mill and fractionating the micronised brewer's spent grain using an air classifier. The present disclosure also provides protein and fibre compositions, processes for producing food products incorporating the protein or fibre compositions, and food products comprising the protein or fibre compositions.

The present disclosure provides processes for the production of protein and fibre compositions from brewer's spent grain. The process comprises micronising dried brewer's spent grain using a pin mill and fractionating the micronised brewer's spent grain using an air classifier. The present disclosure also provides protein and fibre compositions, processes for producing food products incorporating the protein or fibre compositions, and food products comprising the protein or fibre compositions.