Abstract: A filter device is for the filtration of gases contaminated with particles, such as welding gases, in particular produced in manufacturing processes using 3D printers in a production room (52). The filter device has a filter circuit having at least one filter element (55, 56), which filters the particles from the gas. At least a part of those particles get from this filter element (55, 56) into an assignable receptacle (59). The particles within a back-flushing process get into the respective receptacle (59). At least one further filter circuit has at least one further filter element (NF1, NF2 that filters a fluid having the particles obtained at the back-flushing process.

Abstract: 1. Filter device for the filtration of gases contaminated with particles. 2. A filter device for the filtration of gases contaminated with particles, such as welding gases, which are in particular produced in manufacturing processes using 3D printers in a production room (52), having a filter circuit having at least one filter element (55, 56), which filters the particles from the gas, wherein at least a part of said particles get from this filter element (55, 56) into an assignable receptacle (59), is characterized in that the particles within a back-flushing process get into the respective receptacle (59), and in that at least one further filter circuit, having at least one further filter element (NF1, NF2), is present, which filters a fluid, which has the particles obtained at the back-flushing process.

Abstract: A contamination indicator is for filter elements (12) for fluids that are replaceably housed in a filter housing (2). The indicator has a fluid-conveying connection (58) to the interior of the housing (2) and possesses an indicating device (52) providing information concerning the degree to which the filter element is contaminated (12). A temperature-dependently active actuation device (50) is connected upstream from the indicating device (52) in the direction of fluid inlet. By the actuation device, the indicating device (52) is activated when the fluid temperature has reached a predefinable threshold value.

Abstract: The invention relates to a self-tapping screw (1) consisting of a low-strength non-ferrous material, having a screw body (3) which is provided, at least in regions, with a coating (5), wherein the coating (5) is formed from an elastomer or polymer material enriched with fillers.

Abstract: A contamination indicator for filter elements (12) for fluids that are replaceably housed in a filter housing (2), said indicator having a fluid-conveying connection (58) to the interior of the housing (2) and possessing an indicating device (52), which provides information concerning the degree to which the filter element is contaminated (12), said contamination indicator being characterized in that a temperature-dependently active actuation device (50) is present, which is connected upstream from the indicating device (52) in the direction of fluid inlet, by means of which actuation device the indicating device (52) is activated when the fluid temperature has reached a predefinable threshold value.

Abstract: The invention relates to a self-tapping screw (1) consisting of a low-strength non-ferrous material, having a screw body (3) which is provided, at least in regions, with a coating (5), wherein the coating (5) is formed from an elastomer or polymer material enriched with fillers.