Abstract: A ventilating and impingement air bar assembly for floatingly suspending a running web and comprising a direct impingement air bar for directing air directly against the coated side of the running web, a dilution air bar mounted along each side of the impingement air bar and in parallelism therewith. The dilution air bars have an air nozzle slot directed generally parallel to and along the web and in a direction away from the direct impingement air bar. The dilution air bars also have a coanda corner over which the air from the slot is directed away from the web. An air supply is provided for supplying air selectively to the impingement air bar or to the dilution air bars.

Abstract: A high velocity web dryer which has a series of upper and lower air bars for floatingly suspending a running web as the web moves through the dryer. A hot air supplying system provides hot air to the bars for drying the web. The system includes a gas fired burner and a source of combustion air for the burner. A valve control is provided for controlling the admission of combustion air to the gas fired burner, and includes a movable valve for controllably admitting combustion air to the burner. The said valve control includes an initial air admitting valve for providing initial air through the valve control prior to partial opening of the valve control, to thereby provide a relatively smooth and excessive surge-free supply of air to the burner, whereby a stable air supply system in provided without oxygen starvation and without blowing out a flame of the burner.

Abstract: A turning guide for a running web and which guide has a curved guide surface with air slots therein and pressurized air supplied from a blower is delivered through a plenum to the guide to form a cushion of pressurized air which floatingly supports the web. An adjustable damper operated by a servomotor regulates air flow and controls the clearance spacing between the curved guide surface and the web. Control apparatus for the servomotor comprises an electronic control unit, including a memory and a central processing unit (CPU), to which are connected an ultrasonic signal generator, an ultrasonic signal receiver, temperature sensing devices located with the ultrasonic signal sensors, a sensor responsive to blower operation, and a sensor responsive to web presence. In operation, after a desired web clearance set-point is entered into the memory and blower operation and web presence are established, an ultrasonic signal from the signal generator is reflected off of the web to the signal receiver.

Abstract: An arcuate turning guide for a running web over which the running web is floatingly suspended on a cushion of air. The guide has a pair of air nozzle slots positioned transversely and spaced circumferentially apart from one another, the slots being directed toward one another for providing pressurized air to said air cushion. The air slots are defined in part by a nozzle knife which has a sharp nozzle defining edge and also has a heel edge, the guide has a pocket for securely receiving the knife heel edge, and an adjustment is provided for the sharp edge to vary the width of the nozzle slot. The guide has a pair of vane members, one located at each transverse end of the guide, and adjustable means are provided for selectively adjusting said vane members transversely toward and away from one another.

Abstract: A web dryer for floatingly suspending a running web and having a horizontal exit slot through which the web exits from the dryer, makeup air being drawn into the dryer through said slot and in a direction opposite to that of web exit movement. The running web is forced to move up or down based on the fluctuations in air movement and which cause the web to billow across its width, a rotatable roll arranged is in parallelism to the exit slot and located downstream from the web exit slot and around which roll the moving web is wrapped. The web, due to said tendency to billow across its width, thereby creates a tight side of the web around the roll and consequently transversely shifts to the tight side. An airfoil is located transversely across the web and adjacent and inside of the horizontal web exit slot, whereby the incoming makeup air is uniformly distributed transversely by the airfoil and across the web width to eliminate uncontrolled web billowing and consequent transverse shifting of the web.

Abstract: Disclosed are a pulse cancellation system and a pulse cancellation method for enhancing the effect of a small pulse superimposed on a large pulse, in the context of processing video signals in a circuit employing a compression video amplifier. The original waveform is delayed by a selected interval which is short as compared with the expected duration of pulses of interest in it, and the delayed waveform is subtracted from the original one to cancel the effect of those portions of pulses which are longer than the selected delay interval. Excursions of the resulting waveform which are on a selected side of a selected baseline can be removed, if desired. Alternative embodiments provide for selectively bypassing the delay and cancellation circuits, to feed the detector output directly to the compression amplifier in some cases, and for placing the small pulse enhancing circuit before the detector.

Abstract: Apparatus for floatingly suspending a running web without contact and through an arcuate path and including a series of parallel air bars arranged in an arcuate array for discharging pressurized air outwardly therefrom. Either the first or the last air bars, or both air bars, (in respect to the direction of web travel) may be tilted about their longitudinal axis to correct any non-symmetrical web-to-air bar orientation and to provide more stable pressure profile for the air cushion in a symmetrical web flow pattern. A line of equipment for processing a running web and including (1) a preliminary web treating machine from which the web exits selectively at two different locations and thus at two different angles; (2) apparatus for floatingly suspending the running web through an arcuate path; and (3) a floater dryer located at the discharge end of the turning apparatus; thus, the arcutate array of air bars can accommodate different web paths as the web exits from the web treating machine.

Abstract: Apparatus for floatingly suspending a running web through an elongated dryer, and having a series of air delivering, individual air bars located along the length of the web for discharging air towards the web for supporting the latter, the spent air then passing into the space between the air bars; and baffle plates having air discharge openings, the baffle plates being located between adjacent air bars for controlling the discharge of spent air from between the bars, in a generally vertical and parallel direction to the longitudinal centerline of the web, to thereby prevent lateral movement of the spent air and consequently prevent lateral movement of the web.

Abstract: Apparatus for drying a running paper web and floatingly suspending it without contact during the drying process, including air bars which are spaced apart from one another along each side of the web and are fed with pressurized air for a supply duct. The air bars have an air supply opening, and the supply ducts have an air feed neck adapted to be inserted in said air bar supply openings for directing pressurized air thereto, O-ring type seals are located between the bar openings and the duct feed necks to permit relative sealing movement between the bars and supply duct an angular adjustment between said air bar and the duct permits tilting of the bars longitudinally relative to the web to vary the angle of the air discharge against the web.

Abstract: Apparatus for drying a running paper web and floatingly suspending it without contact during the drying process, including air bars which are considerably larger than conventional air bars, for example, being about five and one-fourth inches square in cross-section, and being about three and one-half inches between their nozzle slots. These large air bars are spaced apart from one another along each side of the web a distance of about 15 inches. By so dimensioning the air bars providing the greater spacing between the air bars, considerably more drying capacity is provided, on the order of 14 percent, and requiring less energy input into the dryer. Web drying equipment for sealingly mounting the air bars on the air supply duct means so that the bars can be individually adjusted toward and away from the web can also be tilted or pivoted to change the angle of the drying air being discharged against the web.

Abstract: An air bar for apparatus for drying a running paper web and floatingly suspending it without contact during the drying process, the air bars being spaced along both the upper and lower surface of the web. The air bars have an air distribution chamber including an easily manufactured and assembled slidable, perforated plate.

Abstract: An air bar for apparatus for drying a running paper web and floatingly suspending it without contact during the drying process, which air bars are spaced along both the upper and lower surface of the web. The air bars provided by the present invention have small holes in the inclined walls which form part of the nozzle slots. These holes provide fine scale turbulence generators for air passing through the holes to the slot nozzles.

Abstract: A knockdown shelving assembly includes a cylindrical shelf supporting sleeve positioned on a shelf supporting standard. The shelf supporting sleeve and the shelf supporting standard include ramps which are in interfering engagement with each other to affix the supporting sleeve to the supporting standard, and a shelf rests on an end edge of the cylindrical shelf supporting sleeve to be supported on the supporting standard via the supporting sleeve.

Abstract: An improved ion exchange separation method in which the volume of spent wash liquid and treated feed liquid is reduced by withdrawing a slurry of regenerated resin and wash water from the regeneration column and introducing the slurry into the bottom of the main treating column. The wash liquid is withdrawn from the main treating column along with the de-ionized feed liquid.