Abstract: A cover (1) for centrifugal pump comprising a heating element (8) which has a heating stretch (10) and two end stretches (12) connected to the heating stretch (10), in which the heating element (8) crosses the cover (1) so that the heating stretch (10) is below the cover (1) and the two end stretches (12) are above the cover (1), and wherein at least one first portion (14) of the heating stretch (10) is in contact with the cover (1), and wherein at least one second portion (16) of the heating stretch (10) is spaced apart from the inner face (4).

Abstract: The invention provides a compact multistage furnace of which the installation area in a factory is decreased. A multistage furnace is configured by piling up a plurality of furnace units in the vertical direction. Each of the furnace units includes an upper heater and a lower heater layered in the vertical direction and holding a heat insulator therebetween, a support pipe disposed on one end of the upper heater and extending in the horizontal direction, a support pipe disposed on other end of the upper heater and extending in the horizontal direction, and a plurality of work support bars mounted over the support pipes. The back surface of a work supported by the work support bars is opposed to the upper heater and the front surface of the work is opposed to the lower heater of the adjacent furnace unit disposed above.

Abstract: A method for cooling IR emitters in a heating device for warming preforms before processing them in a stretch blow or blow molding device. IR emitters are arranged on at least one sidewall of the heating device parallel to the transport direction of the preforms, with at least one back reflector arranged on the side of the IR emitters facing away from the performs. The preforms to be warmed include a mouth region and a longitudinal axis and the mouth region is cooled with a first coolant flow. An almost vertical second coolant flow passes between the IR emitters and the at least one back reflector, this second coolant flow being at least partially fed by the almost horizontal first coolant flow and/or is united with the almost horizontal first coolant flow. A heating device and cooling device are also provided.

Abstract: A coated film drying furnace for drying a coated film inside a furnace body by conveying the coated film therein, the coated film having an absorption spectrum for electromagnetic waves of 3.5 ?m or less and having hydrogen bonds, such as an electrode coated film for lithium ion battery. Infrared heaters provided inside a furnace body have outer circumferences of filaments concentrically covered by tubes that function as a low pass filter, and have a structure in which a fluid flow passage is formed between the plurality of tubes. Due to this, a temperature rise in the furnace is controlled so as to prevent explosion of an organic solvent vapor, and the coated film is efficiently heated and dried by intensively radiating near infrared rays of 3.5 ?m or less that have superior ability to cut off the intermolecular hydrogen bonds onto a work.

Abstract: A method and apparatus for thermally processing material on a low-temperature substrate using pulsed light from a flash lamp is disclosed. Material is conveyed past the flash lamp. The pulses of light are formed by Pulse Width Modulation to tailor the shape of the pulses to generate a thermal gradient in the substrate that enables the material to be heated beyond the maximum working temperature of the substrate without damage. Its shaped pulse rate is synchronized to the conveyance speed of a conveyance system. By using the information from a feedback sensor, the thermal gradient is recalculated to alter the shape of the pulses in real time for optimizing subsequent curings in real time without powering down the curing apparatus. The combined pulse shaping and synchronization allow a temperature profile to be tailored in the sample that is uniformly cured in the conveyance direction.

Abstract: A heating apparatus includes a film feed mechanism, a laser light source, a laser irradiation component, and a laser controller. The film feed mechanism has a film contact surface that contacts with one surface of a film material, and moves the film material in the lengthwise direction of the film material. The laser irradiation component emits a laser beam toward the film contact surface. The film contact surface has a first contact surface and second contact surfaces, a material forming the first surface having a different thermal conductivity that a material forming the second surfaces. The second contact surfaces are disposed at positions that come into contact with the ends of the film material in the width direction, while the first contact surface is disposed between the second contact surfaces. The material forming the first contact surface has a lower thermal conductivity than the material forming the second contact surfaces.

Abstract: The first flash irradiation is performed on a semiconductor wafer preheated to 500° C. to heat a front surface of the semiconductor wafer. Thereafter, the second flash irradiation is performed to reheat the front surface of the semiconductor wafer before the temperature of the front surface of the semiconductor wafer becomes equal to the temperature of a back surface of the semiconductor wafer. Thus, the second flash irradiation is performed before the temperature of the front surface of the semiconductor wafer falls. Even if less energy is consumable by the second flash irradiation, the efficiency of heating of the front surface of the semiconductor wafer resulting from each iteration of the flash irradiation is improved.

Abstract: A heating device for tempering preforms before processing in a stretch blow device. The heating device includes a heating alley with a plurality of infra red emitters, arranged parallel to the longitudinal axis of the tempered preforms. At least one back reflector and/or one filter is assigned to the infra red emitters, whereby the at least one back reflector and/or the at least one filter is segmented.

Abstract: Methods and apparatus provide for: an electrically conductive heating element having a length extending in a lateral direction between first and second ends, and one or more output surfaces operating to direct heat therefrom in a direction transverse to the lateral direction; and a carrying structure operable to support a glass sheet such that a major surface of the glass sheet is oriented towards the heat emanating from the one or more output surfaces of the heating element, where the electrically conductive heating element includes at least one heat flux variation feature operating to produce differing magnitudes of heat to emanate from at least two of the output surfaces of the heating element.

Abstract: A method and apparatus for rapid thermal heat treatment of semiconductor and other substrates is provided. A number of heat lamps arranged in an array or other configuration produce light and heat radiation. The light and heat radiation is directed through a heat slot that forms a radiation beam of high intensity light and heat. The radiation beam is directed to a platen that includes multiple substrates. The apparatus and method include a controller that controls rotational and translational motion of the platen relative to the heat slot and also controls the power individually and collectively supplied to the heat lamps. A program is executed which maneuvers the platen such that all portions of all substrates receive the desired thermal treatment, i.e. attain a desired temperature for a desired time period.

Abstract: A method of operating a heating plate for a substrate support assembly used to support a semiconductor substrate in a semiconductor processing apparatus, wherein the heating plate comprises power supply lines and power return lines and respective heater zone connected between every pair of power supply line and power return line. The method reduces maximum currents carried by the power supply lines and power return lines by temporally spreading current pulses for powering the heater zones.

Abstract: A ring type infrared heating device is used in manufacturing process for corrugated cardboard so that the paper surface passing through the heating device can be heated up to appropriate temperature for subsequent shaping operation. The ring type infrared heating device is mainly formed by a lengthwise drum and a plurality of ring type infrared lamps arranged within the lengthwise drum. The surface of the lengthwise drum can be heated quickly up to working temperature by the light radiation energy generated from the ring type infrared lamps, so as to facilitate the shaping operation of corrugated cardboard.

Abstract: A heating apparatus includes a film feed mechanism, a laser light source, a laser irradiation component, and a laser controller. The film feed mechanism has a film contact surface that contacts with one surface of a film material, and moves the film material in the lengthwise direction of the film material. The laser irradiation component emits a laser beam toward the film contact surface. The film contact surface has a first contact surface and second contact surfaces, a material forming the first surface having a different thermal conductivity that a material forming the second surfaces. The second contact surfaces are disposed at positions that come into contact with the ends of the film material in the width direction, while the first contact surface is disposed between the second contact surfaces. The material forming the first contact surface has a lower thermal conductivity than the material forming the second contact surfaces.

Abstract: Multi-zone IR solar cell processing furnaces using a single, full-width conveyor belt; selected zones are divided into multiple lanes by upper or/and lower longitudinal divider walls, and heated by high intensity radiation IR lamps backed by a flat plate of ultra-high reflectance ceramic material. Lamp numbers and spacing in each zone/lane can be varied. Power to each lamp, or zone/lane lamp array, both upper and lower, is individually and independently controlled to provide infinite number of temperature profiles in each heating zone/lane. In multi-lane zones the IR lamps are folded, the inner ends being supported by the lane dividers. Lamp external power leads are both accessible from one side of the furnace. The lamp internal filaments include non-radiant and radiant sections arranged so that a pair of radiant sections are aligned in the lamp-folded configuration and disposed over the full width of the solar cell wafers.

Abstract: A technology to control temperature of a large substrate to be heated. A temperature sensing device is disposed lateral to a region where a radiation heater faces a substrate to be heated inside a heating chamber. A heating device has the heating chamber, the radiation heater, a power-supply device, a substrate-holding device, a control device, and the temperature sensing device. A control program is built into the control device, according to which the power-supply device controls the power applied to the radiation heater to generate heat such that the temperature of the temperature measurement substrate detected by a thermocouple of the temperature sensing device becomes a set temperature. Furthermore, a circulation passage is disposed in close contact with the temperature-sensing device, and with a coolant flowing through the circulation passage, the temperature of the temperature measurement substrate can be cooled from the set temperature to an initial temperature.

Abstract: A radiant heating unit is selectively operated to move radiant heating panels to regulate heating of a continuous web of media as the web moves along a media pathway in an imaging device. The radiant heating panels in a radiant heating unit may be moved to any one of a plurality of positions between and including a fully open position and a retracted position in the housing. A panel driver is operated to move the radiant heating panels to one of the positions in the plurality of positions in response to a variable view factor signal.

Abstract: A heating module for dye sublimation printing on an article comprises a first heating plate, an infrared heating source, and a metal shield. The infrared heating source is disposed under the first heating plate and emits a radiation. The metal shield can prevent the radiation, emitted by the infrared heating source, from projecting directly on the article. The first heating plate preheats a retransfer sheet to be softened and then molded on the article. Consequently, the infrared heating source heats the retransfer sheet for sublimation dye transfer on the article.

Abstract: A heating device and a heating method for a blow molding machine comprise a heating element for radiating heat radiation for heating of preforms. A bottom reflector is movable relative to a counter reflector and is arranged opposite to the heating element for reflection of heat radiation radiated by the heating element in the direction of the preforms. A setting device is used for setting a position (LA+BM, LB+BM) of the bottom reflector relative to the counter reflector.

Abstract: A curing system comprising an oven which may be usefully employed in the fabrication of long polymer columns of various morphologies and formats is described. In accordance with an exemplary arrangement the invention relates to a curing system comprising an oven that allows for the formation of very long capillary columns.

Abstract: In a heat treatment apparatus, a substrate held by a holding part is irradiated with light emitted from halogen lamps to perform preheating thereon and irradiated with a flash of light emitted from flash lamps to perform flash heating thereon. Part of light which is emitted from the halogen lamps and goes toward the flash lamps passes through a window hole formed in a peripheral-light shielding member and enters the substrate held by the holding part, and its energy is used for the preheating on the substrate. On the other hand, the remaining light is blocked out by the peripheral-light shielding member.

Abstract: An apparatus for heat treating semiconductor wafers is disclosed. The apparatus includes a heating device which contains an assembly of light energy sources for emitting light energy onto a wafer. The light energy sources can be placed in various configurations. In accordance with the present invention, tuning devices which are used to adjust the overall irradiance distribution of the light energy sources are included in the heating device. The tuning devices can be either active sources of light energy or passive sources which reflect, refract or absorb light energy. For instance, in one embodiment, the tuning devices can comprise a lamp spaced from a focusing lens designed to focus determined amounts of light energy onto a particular location of a wafer being heated.

Abstract: A novel flexible infrared device is provided for heating surfaces in a uniform manner not available previously. The heater is designed in a manner so as to allow “hugging” of the surface by attaching the heater module to at least two swivel points located above the heating plane. In this manner the common problems encountered with heating dies by IR heaters is overcome.

Abstract: The invention provides a pump, in particular for water-bearing domestic appliances such as dishwashers, washing machines or the like, comprising a pump housing and a heater device which is in thermal contact with the liquid-bearing interior of the pump housing. The pump according to the invention is simple and cost-effective to produce. For this reason, the pump housing (2) is produced at least partially from plastic, with the heater device (11, 12) being at least partially connected to the plastic in an interlocking manner.

Abstract: An optical cavity furnace 10 having multiple optical energy sources 12 associated with an optical cavity 18 of the furnace. The multiple optical energy sources 12 may be lamps or other devices suitable for producing an appropriate level of optical energy. The optical cavity furnace 10 may also include one or more reflectors 14 and one or more walls 16 associated with the optical energy sources 12 such that the reflectors 14 and walls 16 define the optical cavity 18. The walls 16 may have any desired configuration or shape to enhance operation of the furnace as an optical cavity 18. The optical energy sources 12 may be positioned at any location with respect to the reflectors 14 and walls defining the optical cavity. The optical cavity furnace 10 may further include a semiconductor wafer transport system 22 for transporting one or more semiconductor wafers 20 through the optical cavity.

Abstract: Method of heating a plastic preform (1) for the manufacture of a container by forming it from the preform (1), this method comprising: a step of transporting the preform (1) along a predetermined path with rotation of the preform (1) about its axis (A); and a step of heating the preform (1) along said path by means of infrared radiation sources (11), wherein the intensity of the emitted radiation is regulated along the path so as to heat selectively at least one angular section (7, 7a, 7b) of the preform (1).

Abstract: An apparatus for heat treating semiconductor wafers is disclosed. The apparatus includes a heating device which contains an assembly of light energy sources for emitting light energy onto a wafer. The light energy sources can be placed in various configurations. In accordance with the present invention, tuning devices which are used to adjust the overall irradiance distribution of the light energy sources are included in the heating device. The tuning devices can be either active sources of light energy or passive sources which reflect, refract or absorb light energy. For instance, in one embodiment, the tuning devices can comprise a lamp spaced from a focusing lens designed to focus determined amounts of light energy onto a particular location of a wafer being heated.

Abstract: In a continuous-feed thermomolding machine a foil is advanced in a transport direction at a constant travel speed through a heat station where it is exposed to a heat source such that each piece of the foil is exposed for a predetermined residence time. When the machine is stopped, a shield is positioned in the station between the foil and the source so that substantially no heat is imparted to the foil from the source. The machine is started by accelerating the foil to the travel speed while simultaneously and synchronously accelerating the shield opposite to the travel direction such that, as the shield fully retracts from the station, the foil reaches the travel speed and, before the shield has fully retracted from the station, every piece of the foil in the station exposed by the retracting shield is exposed to the source for the residence time.

Abstract: A method for manufacturing a honeycomb article with an after-applied skin includes fixing a honeycomb body between a first support member and a second support member of a skinning apparatus, the first support member positioned against a first end of the honeycomb body and the second support member positioned against a second end of the honeycomb body. A skin layer is applied to the honeycomb body by an applicator, where a first edge of the skin layer contacts the first support member and a second edge of the skin layer contacts the second support member. At least one of the first edge and the second edge of the skin layer is heated by a heat source before removing the honeycomb body with the applied skin layer from between the first and second support members.

Abstract: A system for coating a substrate includes a heater that heats the substrate. The heater includes a two-dimensional array of a plurality of heat sources which supply heat to the substrate when the substrate is in the presence of the array of heat sources. The heater further includes a controller that controls the operation of each heat source to heat a localized area of the surface of the substrate according to a predetermined temperature profile for the substrate.

Abstract: An apparatus and method of removing carrier from an article are provided. The apparatus includes a heater positioned to direct heat toward an article travel path. The heat has an emission spectrum with a peak emission wavelength and the carrier having an absorption spectrum with a peak absorption wavelength. The peak emission wavelength of the heat substantially corresponds to the peak absorption wavelength of the carrier.

Abstract: A furnace of controlled heating and treatment of material using infrared radiation. The furnace is capable of continuous infrared treating of material with consistent radiation being applied to the material, ease of access to the furnace for maintenance cleaning and repair, excellent control of radiant cooling of the material to be treated, and ease of maintenance of a volatile component condenser.

Abstract: A monofilament line straightening device and a monofilament line straightening method according to the present invention perform steam blow and/or pressing using a heated trowel member to a monofilament line in the state where its tension is loosened by a predetermined amount relative to the state where it is suspended without being loosened, thereby removing curls in the monofilament line. Thus, a reduction in the line strength which might occur when removing the curls in the monofilament line by heating can be suppressed.

Abstract: A particle reduction apparatus comprises a radiation absorption zone for receiving a gaseous flow carrying particulate matter. A transparent shield surrounds at least a portion of the radiation absorption zone. A radiation source for generating radiation and for directing the radiation into the radiation absorption zone to promote reduction of the particulate matter is provided, and an insulation layer at least partially surrounds the radiation source.

Abstract: A heating unit includes a plurality of radiant heaters, a plurality of brackets on which the radiant heaters are mounted in a row, and a frame on which the brackets are mounted in a parallel arrangement and thereby the radiant heaters are mounted in a grid configuration, wherein each of the radiant heaters includes: a support plate substantially having a rectangular shape; a pair of connection terminals substantially perpendicularly extending, while having a space therebetween, from one surface of the support plate; and a strip-shaped heater element arranged between the pair of connection terminals and covering the one surface of the support plate, and wherein the connection terminals have connection portions projecting from the other surface of the support plated, and each of the brackets has a terminal hole into which the connection portion is inserted.

Abstract: A printing apparatus may include a heating element with at least one of a contact fuser, a radiant fuser, a substrate preheater, an image bearing member heater, and a transfuser, the heating element including a lattice of filaments wherein the filaments are separated from each other by a spacing and the spacing is such that an energy input into the heating element is radiantly output in a specific frequency band. A method of using a printing apparatus may include providing a heating element that is part of the printing device and that includes a lattice of filaments wherein the filaments are separated from each other by a spacing and the spacing is such that an energy input into the lattice is radiantly output in a specific frequency band, and performing at least one printing operation.

Abstract: A device for heating plates of glass (3) which are hardened or deformed, includes two ceramic heating plates (1) between which a plate of glass (3) is arranged. Compensation plates (20) are associated with the heating plates (1) at a distance therefrom, in addition to heaters (6) which are arranged close thereto. The heaters (6) are accommodated in housings (11) which are defined on one side of the heating plates (1). Holes (8) are provided in the heating plates (1). Gas is fed through the holes into the housing between the heating plates (1) and the compensating plates (2). The gas is heated by flowing past the compensating plates (20) and forms gas cushions (7) on both sides of the plate of glass (3) which hold the plate. The plate of glass (3) is heated in a homogenous manner by radiation and convection.

Abstract: When a heat treatment device for heating synthetic fiber filament yarns by saturated steam is installed to a drawing and texturing device for synthetic fiber filament yarns, in order to lower the total height of the devices than a conventional one, cylindrical hot pins each having a heat-absorbing part and a heat-discharging part are formed integrally with the bottom surface of a laterally extended container for sealing saturated steam of heat medium liquid in such a fashion as to penetrate through the bottom surface from inside to outside of the container with axes of the hot pins extending in a vertical direction, and the level of surface of the heat medium liquid within the boiler connected with the container is disposed at a position lower than the inside bottom surface of the container.

Abstract: An apparatus and method for the controlled heating and firing of oak wood in the form of flat staves. The staves are assembled in a panel and heated by far infra red heaters passed in a controlled manner across the panel.

Abstract: A reflector (42) for use in a microwave excited ultra-violet lamp system (10) having a plasma lamp bulb (20). The reflector (42) includes a pair of longitudinally extending reflector panels (46) that are mounted in opposing, i.e., mirror facing relationship, and in space relationship to the plasma lamp bulb (20). A longitudinally extending intermediate member (52) is mounted in spaced relationship to the pair of reflector panels (46) and to the plasma lamp bulb (20). The reflector panels (46) and the intermediate member (52) form a pair of longitudinally extending slots (64) that are operable to pass air toward the plasma lamp bulb (20) to envelop the bulb (20) effectively entirely about its outer surface. Alternatively, the pair of reflector panels (46e) are connected to longitudinally extending edges (58e) of the intermediate member (52e).

Abstract: A apparatus and method for fusing toner to media in a laser imaging device. A paraboloidal trough reflector is positioned about a linear heating element to focus and concentrate radiant energy emitted from the heating element onto a thermal spreader. The thermal spreader absorbs the radiant energy and converts it to heat. A thermoplastic fusing roller is rotatably supported about the bulb heater, the reflector, and the thermal spreader. A pressure roller is supported to urge media against the fusing roller at the position of the thermal spreader. Fusing heat is conducted from the thermal spreader, through the fusing roller and to the media. The pressure roller is driven to rotate, thereby advancing the media through the fusing unit to fuse the toner thereto. Additionally, the present teachings disclose a printing device having a fusing unit with a bulb heater that emits user non-perceivable light. A mechanism is included for conveying light from the bulb heater to a location within the printing device.

Abstract: A drier unit (10) for drying printed products has a plurality of drier rails (12), which comprise in each case a supporting body (14) manufactured from a hollow section (16). The clear outer contour of the cross-sectional area of the supporting bodies (14) is a rectangle. The drier rails (12) have in each case two resistance heating units (60) and additionally carry an infrared radiator (164).

Abstract: A heating unit is provided with heating modules in a housing. Each module has a heating element. An electrical connection is attached to each heating module such that each heating module can be selectively energized to heat its heating element to a high temperature. Alternative embodiments and a related method of rapid heat processing are also disclosed.

Abstract: A fixing device for forming a toner image formed on a recording medium includes a heat roller accommodating a halogen heater. The halogen heater includes a glass tube formed of transparent quartz and provided with a wall thickness of 0.8 mm or below to increase transmission thereof. The increased transmission reduces a heat loss ascribable to the glass tube at the time of warm-up of the fixing device. The heat roller has such a thermal capacity that it can be warmed up in 10 seconds or less. The glass tube is filled with inactive gas whose major component is krypton or xenon. A tungsten filament accommodated in the glass tube has its diameter reduced in order to implement a color temperature of 2.500 K or above. An image forming apparatus using the fixing device is also disclosed.

Abstract: A heating device for heating at least one advancing yarn in a texturing machine, wherein the body of the heating device defines an elongate heating channel. The heating channel accommodates an exchangeable support which mounts a plurality of yarn guides which are arranged inside the heating channel for forming a plurality of adjacent yarn guide tracks for guiding a plurality of yarns in such a manner that the yarns advance in a yarn advancing plane extending at a predetermined distance from the bottom wall of the heating channel.

Abstract: An UV oven comprises a compact longitudinal elliptical reflector with first and second focal lines; a longitudinal small diameter bulb disposed along the first focal line that generates short wavelength UV radiation, IR radiation, visible radiation and heat to cure the coating on magnet wires or wire-like elements that are passed through the other focal line. The inside surface of the reflector is coated with material to enhance the reflectivity of the short wavelength UV, IR and visible radiation.

Abstract: A method for safely removing a contaminant from a substrate surface without the need for any precoating of the substrate. Because the resultant molecular decomposition of the contaminant occurs relatively faster than heat transfer to the underlying substrate, substantially no substrate heating results. The light source is preferably a xenon flash lamp operated with a pulse repetition rate of between about 0.1 pulses/second and 12 pulses/second, an energy pulse duration of about 400 microseconds to about 800 microseconds, and a peak energy per pulse exceeding about 3,750 joule. Ultraviolet elements of the spectrum produced by the flash lamp are reduced or eliminated by the use of filters or reflectors that absorb or otherwise eliminate ultraviolet light. The substrate to be decontaminated may be the exposed surface of a living animal or plant or may be protective clothing or a vehicle contaminated with chemical or biological agents.

Abstract: A cross-direction dryer for typically drying a continuous web of paper or paper to which coating has just been applied provides both for baseline drying and a linear moisture profile by the use of respectively gas and electric heating portions of the heater units. Profile control is normally provided by control of the voltage to electric heating lamps. Such heating lamps are suspended over a large area gas burner to provide a combined increased infrared heat output. Encapsulation of the heating lamps with quartz provides for reradiation of the medium wavelength radiation produced by the gas burner. Thyristor switching for the quartz halogen heat lamps may be located adjacent to each heater unit and cooled by the combustion air for the gas burners.

Abstract: A heating belt is laid along a conveying path for a recording medium moved after development, a halogen lamp is incorporated in a belt drive roller for driving the heating belt so as to heat the heating belt by heat generated by the halogen lamp, and accordingly, the heating belt whose temperature is controlled at a predetermined temperature heats the recording sheet. With this arrangement, the conveying speed of the recording sheet and the moving speed of the heating belt are set to be equal to each other. Alternatively, the heating belt may itself generate heat.

Abstract: A method and apparatus heats a thin sheet of material prior to subjecting the sheet to a process for forming the sheet into a desired shape, such as by vacuum forming. The sheet is supported in a generally horizontal manner during transport through the apparatus, for example on a pair of conveyor chains or belts which carry and provide support to the longitudinal edges of the sheet by gripping same. The sheet is heated from above and below by heating elements and a diffuser plate is located between the upper and lower heating elements, and beneath the downwardly facing side of the sheet. The diffuser plate permits air flow therethrough from an air source and forms a film of heated air adjacent the downwardly facing side of the sheet to support the sheet and prevent excessive downward sagging thereof during heating thereof.

Abstract: The invention relates to an arrangement in an apparatus for forming a windscreen interlayer that includes a heating unit for heat treating a moving web. The heating unit includes individually adjustable radiation units for directing radiation towards the moving web and a radiation restriction device for suppressing the radiation output in desired areas. According to the invention, the radiation restriction device includes a board which is essentially perpendicular to the plane of the web, the board being aligned essentially in the travel direction of the web and positioned at the level of the radiation sources at its upper end and at a distance from the web at its lower end such that no direct radiation output is directed towards the desired area of the web from the closest radiators in operation.