Abstract: A method and device for drying a moving web including a first infrared radiator arranged on a first side of the web and a second infrared radiator arranged on a second side of the web at least partially opposite to the first infrared radiator and proximate to the first infrared radiator. The wavelength of the maximum intensity of the radiation generated by the first infrared radiator is shorter than the wavelength of the maximum intensity of the radiation generated by the second infrared radiator. The power density of the first infrared radiator is from about 450 kW per sq.m to about 700 kW per sq.m and the emitter temperature of the first infrared radiator is from about 2000.degree. C. to about 2800.degree. C. The second infrared radiator includes a surface layer made of a metal, metal alloy or ceramic material whose emissivity is substantially equal to or higher than about 0.6.
Abstract: A method and a device (1) to treat a paper web (12) by using air, which flows around and cools the infrared lamps (4), to impinge against the paper web and thereafter be removed. A glass plate (9), supported by a pair of glass holders (8), is used to shield the paper web from the infrared lamps. In order to improve the total efficiency and, in particularly, to achieve even and efficient drying of the paper web by using less energy, the cooling air outlets adjacent the glass holders are designed as adjustable width nozzles (19) to direct the heated air against the paper web. The nozzles extend across the entire width of the paper web and the cooling air is ejected from the nozzles at high speed thereby forming an air knife to tear apart the boundary layer of humid air which follows the paper web and subjects the paper web to a more intense heat treatment.
Abstract: Apparatus (1) for treatment of a continuous paper web (18) in a paper machine by means of infra-red radiation, comprising, in a parallel relation to the paper web, infra-red heaters (17) and protection panes. The protection panes (12) are arranged by way of a series of separate panes overlapping each other and forming ventilation gaps (27), which are directed substantially in parallel relation to the web in the same direction or in two opposite directions.
Abstract: An infra-red radiator comprises a ventilated body structure (10) having a cross-web (12), a central leg (14), two side legs (16) and two intermediate support legs (18). Stretched between the legs (14, 16) are two reflectors (24) made of a flexible metal foil material and located in front of IR-lamps (26). Located between reflectors and body structure are ventilating hollows or cavities (36, 38) and channels (40, 57), for cooling or ventilation air, are incorporated in the legs. Inlet channels (40) have upper openings (44) which project cooling air flow along with the rearwardly located surface of the reflector (24), and lower openings (46) which project cooling air flow (52) along the reflector surface located between the reflector (24) and lamp (26).
Abstract: A counter reflector for use in drying webs, e.g. in a paper making machine, receives heat radiation, which has passed through the paper and returns the energy to the web by reflection. The counter reflector consists of a frame, glass ceramic shields (5) facing the paper web and having a chamber (14) to be pressurized with a drying gas, which issues through openings (10, 11, 12, 13) in and between the glass ceramic shields (5) and thus, the said of the paper web facing the counter reflector is dried by reflected heat radiation as well as warm gas flow in a continuous and steady way, resulting in easily controlled drying/curing conditions in the paper web. The issuing gas flow also serves to pressurize and thus stabilize the space between the counter reflector and the adjacent web and to keep away the latter from the former when saturated with heat. The counter reflector is provided to entrap all further heat which is generated in the drying/curing zone.
Abstract: The present invention relates to an infra-red radiation device comprising a shell or reflector body and holders mounted on the ends thereof, and also holders for accommodating IR-lamps. Each shell or body includes a plurality of individual reflector parts comprising reflector plates preferably of parabola shape. The body holder comprises a web and a recumbent U-shaped element, located at the end of the body adjacent the open reflector side. The free leg of the U-shaped element includes a glass holder in which a glass plate can be inserted, to insulate IR-lamps from dust and dirt. The U-shaped element is provided with holes for screws. The holder or reflector and/or the body holder includes, or include, air gaps or holes intended for cooling air, which preferably cools the ends of the lamps.
Abstract: The present invention concerns a method and an apparatus for accelerating the drying and/or curing of filler material, primer and top-coatings in connection with touch-up work on car bodies.According to the apparatus of the invention, grinding, filling and spraying are accomplished in one and the same booth, whereupon a carrier containing infra-red heat radiators and/or heating-elements and/or nozzles is traversed over the car, whereby controlled heat-energy is supplied to the surface accelerating drying and/or curing process of the surface treatment material. For supplying sufficient heat-energy to the front and rear parts of the car, special reflectors are located in front of and behind the car for reflecting heat-radiation from the carrier.
Abstract: A device for reflecting radiant energy comprises a housing having two substantially mirror-symmetrical housing sections, each being provided with a curved supporting surface. The two housing sections are connected to one another so that the supporting surfaces face one another defining a concave cavity in the housing, the cavity being open toward the exterior of the housing. A reflecting element is situated in the cavity and supported on the supporting surfaces in substantial conformity therewith, the marginal portions thereof being received into recesses adjacent to the open side of the cavity. The housing may be elongated and the generatrices of the supporting surfaces may extend in parallel to the axis of the housing, and an elongated source of radiant energy may be accommodated in the cavity and extend parallel to the axis of the housing. A cooling system may be arranged between the housing sections or within the same so as to cool the supporting surfaces thereof.