Abstract: A method for grinding feed material (1) in the form of particulate bulk material is disclosed. In the process, particle sizes of the feed material (1) are detected, and the feed material (1) is ground in a mill (3) on the basis of at least one manipulated variable. The at least one manipulated variable is modified when the proportion of small particle sizes in the detected particle sizes increases. A system for grinding feed material (1) in the form of particulate bulk material is also disclosed.

Abstract: A packaging container comprises a foil laminate comprising at least two layers in which openings are formed. The two layers are joined together over their entire surface area, except for in a striplike channel. A valve strip is disposed in the channel and in valvelike fashion covers the openings of the inner layer. If there is an overpressure in the packaging container resultant gas can escape into the open through the openings and the valve strip acts like an overpressure valve. As a result of the specialized disposition and embodiment of the valve strip and of the openings, a reliable escape of gas produced is achieved.