Abstract: A rotatable part of a trimming apparatus arranged for cutting and removing of grass and other vegetation adjacent a sprinkler head of a watering system is described. The rotatable part includes an elongated shaft and a cutting head connected to the elongated shaft. The cutting head includes at least one arm, preferably three arms. The arm includes a cutting element connected to a distal end of the arm. The cutting element includes a central part connected tangentially to an outermost edge of the distal end of the arm radially in relation to the connection central portion, and a rear part arranged at an angle in relation to the central part and arranged at a rear edge of the central part in relation to a rotational direction of the cutting head during rotation of the cutting head. A trimming apparatus including a rotatable part is also described.

Abstract: Raw material to be expanded is supplied to an expansion chamber (12). The volumetric weight (M) and the moisture content (F) of the expanded material is measured, and signals representing the measured values obtained, are supplied to a microcomputer (27). This is programmed for comparing the volumetric weight as measured with a nominal value of the volumetric weight at the prevailing moisture content of the expanded material and is adapted to supply in dependence of the comparison made a signal for controlling the screw conveyor and drive unit (11, 13) for the supply of raw material to the expansion chamber to control the expansion of the material in dependence of the comparison by increasing or decreasing the amount of raw material supplied per unit of time.