Abstract: A fabric packing has a plurality of layers made of a filament of metal or plastic and includes bulges for maintaining the fabric layers at a distance. The bulges have first protuberances of generally trough-shaped configuration and second protuberances formed on the first protuberances, thereby defining respective apexes. The second protuberances are sized smaller than the first protuberances, wherein neighboring fabric layers are supported on one another via the second protuberances.

Abstract: A fabric packing has a plurality of layers made of a filament of metal or plastic and includes bulges for maintaining the fabric layers at a distance. The bulges have first protuberances of generally trough-shaped configuration and second protuberances formed on the first protuberances, thereby defining respective apexes. The second protuberances are sized smaller than the first protuberances, wherein neighboring fabric layers are supported on one another via the second protuberances.

Abstract: A machine for continuously making spirally wrapped tubular filter material screens utilizes a mandrel around which one or more strips of filter material are wrapped. The resulting spirally wrapped tubular filter material screen may or may not comprise multiple layers of filter material. In one embodiment, the strips of filter material are continuously resistance welded along or about the helical seams of the filter material strips utilizing an outer welding wheel and an inner welding wheel.

Abstract: A grinder for comminuting waste material comprises a frame structure (18, 20). A grinding rotor (24) is rotatably carried by the frame structure (18, 20.) The grinding rotor (24) carries a plurality of cutting tools (36) cooperating with a counter blade (26, 28) carried by the frame structure (18, 20). Two plate chain conveyors (68, 70) are vertically aligned so that working runs (80, 120) thereof form a converging moving wall funnel positively feeding pieces (146, 148) of material to be comminuted towards a grinding unit (12) formed by the grinding rotor (24) and the counter blade (26, 28).

Abstract: For reuse of waste wood obtained in the production of windows, furnitures and chip board it is suggested to diminute the waste wood to particles, the diameter of which is in the region of some 10 mm. The thus obtained wood particles are coloured to form a granulate material, which can be used for decorative purposes.

Abstract: A shredding roller (10) has a roller core (12) and a plurality of cutter blades (22) supported by the roller core (12). The roller core (12) possesses an axial cavity (38). A plurality of penetration apertures (36) for shredded material are provided in the sheath (35) of the roller core (12), which surrounds the axial cavity (38). At least one discharge aperture (39) for shredded material is provided in at least one axial end area of the roller core (12). A shredding roller of this type increases the throughput of a shredding machine for shredded material.

Abstract: A machine for crushing even soft material remains that has two crushing rollers (36, 38) driven by independent drives, which rollers co-operate with stationary crushing racks (30, 62). Screens (38, 66) located behind the two crushing rollers (36, 56) are connected on their under side to a common collecting chamber (46) for material chips.

Abstract: A compact electrolytic cell with direct through-flow comprises an electrode stack formed as a cartridge unit which is readily exchangeable into and out of a housing which is made of commercially available plastic tubing materials. The cell can be adapted to meet a wide range of application requirements by the variation of parameters such as salt concentration, flow rate, etc.

Abstract: N-substituted .beta.-aminocrotonic acid esters of the formula ##STR1## in which R.sup.1 is hydrogen, or alkyl or alkenyl with up to 4 carbon atoms;R.sup.2 is straight-chain or branched alkyl or alkenyl with up to 9 carbon atoms, optionally interrupted by O or S, and optionally substituted by halogen, phenoxy, dimethylamino, cyclic alkyl or alkenyl with up to 8 carbon atoms which are optionally substituted by halogen, dimethylamino, or alkyl, alkoxy or alkylthio with up to 4 carbon atoms, phenyl which is optionally substituted by halogen, dimethylamino, phenoxy, or alkyl, alkenyl, acyl, alkoxy, alkenoxy or alkynoxy containing up to 4 carbon atoms, or a 5- or 6-membered heterocyclic ring containing at least one O, S or N hetero-atom and optionally substituted by halogen, alkyl or alkoxy containing up to 4 carbon atoms or R.sub.

Abstract: An assembly for preventing the falling of dust and debris from the roof and from the break of a mine, particularly a coal mine. The assembly comprises a shield support structure having roof bars and a roof covering disposed between the roof of the mine and the roof bars. The roof covering includes a welded wire-netting sheet having longitudinal and transverse wires with a dust-tight web welded or fixed in between said longitudinal and transverse wires.