Abstract: An application unit for applying a liquid or pasty medium onto a surface moving past the application unit. This has particular application to direct or indirect application of such a medium to a paper or board web. A support beam and a front wall supported generally further from and a rear wall supported generally closer to the moving surface. The walls are spaced apart for defining a pasty medium supply gap between them and are oriented so that the supply gap generally directs the medium toward the surface. The front and rear walls can selectively receive releasable attachment of members for forming a liquid medium an application chamber, the chamber having a downstream end with a blade, an upstream end with a damming strip over which the excessive medium in the application chamber can overflow. Alternatively, a second set of attachable members may be attached to the walls for forming a free jet nozzle dosing gap that communicates with the supply gap for directing the medium to the surface.

Abstract: A rotary coater device (12) is provided, comprising front and rear frame plates (30) having mounted therebetween: a die bracket assembly (100), a screen assembly (200), a heater hood assembly (300), and an impression roll assembly (400). The die bracket assembly (100) includes (i) a die (500) positionable within a screen (202) and having an opening (550), the die being movable from an operating position wherein the die opening is proximate to an inner surface of the screen to an idle position wherein the die is drawn away from the inner surface; and (ii) a pivotable support arm (102a) fixedly attached at one end to a positioning mechanism (112) and removably attached at an opposite end to the die, the pivotable support arm being pivotable away from the screen when the opposite end is detached from the die to expose the screen for removal from the coater device.

Abstract: A method and apparatus for applying a coat mix to a high-speed running board or paper web by accurately premetering and pre-smoothing the applied coal with an applicator apparatus and then minimally doctoring the applied coat with an air knife. The applicator apparatus has a narrow slot-orifice extending in a cross-machine direction for facilitating high-speed laminar flow of coating mix into a gap region defined by confronting surfaces of the applicator apparatus and the web. The applicator apparatus has a member for directing the ejected coating mix in tho gap region in a direction reverse to a travel direction of the web so that only a predetermined portion of the ejected coating mix is allowed to form an applied coat on the web. This accurate premetering of the coating mix by the applicator apparatus permits an operator to readily optimize the subsequent process of doctoring the applied coating with an air knife.

Abstract: A roll doctor assembly as dosing element for a coater serving to coat a traveling web (e.g., paper web) features a rotatable doctor bar (14) that extends transversely across the web width. The doctor bar (14) is fitted in a doctor backing (12). The doctor backing (12) extends as well transversely across the web width. According to the invention, the doctor bar (14; 14'; 14") and the doctor backing (12; 12'; 12") are part of a modular system, so that the doctor bar is exchangeable for another with different outside diameter and, consequently, the doctor backing is exchangeable for another with different bearing diameter. The different doctor backings are adapted to one another to the effect that the axes of rotation of the different doctor bars (14; 14'; 14") assume the same position relative to the support beam (10).

Abstract: The invention is directed to an applicator for coating a traveling fiber web with a coating mixture. The applicator includes a backing roll having a shell surface for carrying the web, and a nozzle for feeding the coating mixture. The applicator includes a support beam; a nozzle which is integral with or connected to the support beam; and a doctor bar carried by the support beam. The doctor bar has a guide surface. The guide surface and the backing roll define a nip for producing a hydrodynamic pressure. The guide surface approaching the shell surface of the backing roll extends to an exit edge at a location nearest the backing roll. A device is provided for flexibly backing the doctor bar on the support beam.

Abstract: The invention is directed to a coating apparatus for the direct or indirect application of a liquid or pasty substance onto a moving layer of material, such as paper, carton or cardboard, with a dispenser implement and, at some distance further along the line, a spreading device for finely controlling the amount of applied medium. The dispenser implement and the spreading device share a common collector/drain surface and a common collector bin for gathering excess amounts of the liquid or pasty substance.

Abstract: An applicator head is positioned beneath a backing roll over which a substrate can be drawn. The applicator head has a housing which contains a pond of coating material between an up machine overflow lip and a down machine extraction plate or premetering plate. Coating material at a relatively low velocity flows into the pond adjacent to the overflow lip. The premetering plate extends radially from the coating inlet to a position proximate to and converging with the backing roll, where it premeters the amount of coating applied to the substrate. The premetering plate preferably has a plurality of holes through which coating and air are drawn. A metering element is spaced downstream of the premetering plate, and a low pressure area is constructed therebetween. Air and coating are drawn from the low pressure area through a valve, and the pressure thereby controlled.

Abstract: An apparatus for high speed manufacturing of thin-film coated products, wherein the coating thickness is even and the products do not contain uneven streaks. The apparatus includes a coating head having a frontedge disposed on an upstream side of a support, a backedge disposed on a downstream side of the support, and a top end receding stepwise away from the frontedge and away from the support. The backedge has an acute-angled top end portion. The coating apparatus is configured so that filtration central-line waves (W.sub.CA) are formed in a direction perpendicular to the direction of movement of the support. These waves are formed in slit inner surfaces, a frontedge surface and a backedge surface of a top end portion of the coating head. Each wave in these surfaces is less than or equal to 0.2 .mu.m in length.

Abstract: Squeegee assembly in particular intended for coating substantially cylindrical objects with a liquid or pasty material, at least comprising an annular squeegee with an outer mounting edge and an inner levelling edge, the latter comprising a ring member and/or ridges substantially extending in the intended direction of movement of the squeegee, the ridges defining grooves, which grooves are designed to form channels with the surface of the object to be coated.

Abstract: A stencil printing apparatus (100) is provided for printing a solder paste (108), through apertures (104) in a stencil (102), onto metallized portions of a printed circuit substrate (106). The printing apparatus contains a laser surface profiling device (114) which is used to produce 2- and 3-dimensional profiles of a portion of the surface of solder paste adjacent to a squeegee (110). Data is processed and sent to a controller (118) which is coupled to a solder paste dispenser (112). The controller automatically signals the dispenser (112) to dispense additional solder paste at deficient locations as needed.

Abstract: A method and apparatus for applying coating liquid to a web of paper traveling over a web supporting surface at speeds of 3,000 or more feet per minute to produce a coated web free of streaking and other imperfections includes the steps and structural elements for distributing coating liquid onto the supported web through a limited application zone within a short dwell time of the liquid on the web, the web moving through the application zone at a speed that is sufficiently high to create turbulence in the coating liquid being applied to the web, doctoring the coating liquid on the web by biasing a primary doctor against the coated web at the rear edge of the application zone so as to form a layer of coating liquid on the web as the web leaves the application zone, the turbulence in the coating liquid causing machine direction streaks in the layer of the coating liquid as the web leaves the application zone; and, at a location downstream and isolated from the application zone, performing a successive doctorin

Abstract: A method of and apparatus for applying coating liquid to a web of paper traveling over a web supporting surface at speeds of 3,000, 4,000 and more feet per minute to produce a coated web free of streaking and other imperfections comprises apparatus for and the sequential steps of distributing coating liquid in a turbulent state over the supported web through a limited application zone within a very short dwell time of the turbulent liquid on the web; subjecting the coating liquid on the supported web to an initial doctoring by means of a primary doctor blade biased under pressure against the coated web at the rear edge of the application zone to form on the web downstream from the zone a relatively quiescent layer of coating liquid having a wet film thickness sufficiently in excess of the final wet film thickness to accommodate a subsequent final wet film doctoring of the coating liquid on the web; and, at a location downstream and isolated from the application zone, subjecting the relatively quiescent layer

Abstract: An apparatus and method for applying a coating to glass including a support surface for supporting a glass pane, a print screen having a screen support frame defining a perimeter of the print screen disposed above the support surface to apply a coating over the print screen. The print screen is deflected into contact with the glass pane at predetermined points thereon and the coating is moved over the print screen to deposit the coating on the predetermined points on the glass pane when the print screen is so deflected. The apparatus also includes a vapor manifold having a predetermined width disposed within the perimeter defined by the screen support frame and coupled to a source of vapor. The vapor manifold distributes a vapor blanket over the print screen and the glass pane, thereby reducing the rate at which the coating on the glass pane dries and impede evaporation of the coating from the print screen.

Abstract: A creping system includes a Yankee dryer rotatable about its axis, a blade support mechanism which includes (a) a pair of guide rails, (b) a fixed attitude linear bearing engaging and translatable along each of the guide rails, each fixed attitude linear bearing being mounted on a block and (c) a combination linear-rotary bearing being carried by each block, the axis of each combination linear-rotary bearing being parallel to the generators of the surface of the Yankee dryer and collinear with the axis of the other combination linear-rotary bearing. A stub shaft engages each combination linear-rotary bearing, each stub shaft being translatable along, and rotatable about, the axis of its respective combination linear-rotary bearing. A blade holder is mounted between the stub shafts, and a blade mounted on the blade holder for engagement with the surface of the Yankee dryer.

Abstract: A die coater for applying a material to a web is provided including a die for applying the material to the web in an application region; and a plurality of interconnected rolls selectably positionable in the application region to serve as a backup roll for the web for the application of the material, In addition, or in the alternative, the die coater includes a plurality of interconnected dies selectably positionable in the application region for applying the material to the web; and a backup roll for the web in the application region, wherein a selected one of said interconnected dies selectably positioned in said application region is adjustable to adjust an angle at which said material is applied to said web through said selected die.

Abstract: A uniform film of coating is delivered onto a substrate at high speed by a film applicator, such as a coater apparatus for a papermaking machine, which has a static converging wedge, an adjustable converging wedge, and an extraction channel located between the two wedges. As a unit, the film applicator minimizes the hydrodynamic flow instabilities, as well as reduces flow variations associated with a nonuniform feed and a dynamic contact line. The film applicator also removes entrained air and excess coating from the application zone in order to improve the flow stability and machine runnability.

Abstract: A coating device for one- or two-sided coating of a travelling web includes at least one counter-device and at least one first metering device placed on the opposite side of the web (5) for applying onto said web, in cooperation with said counter-device, a coating agent. The metering device (7) includes an evening or metering member (11) extending across the web over its full width. The evening or metering member is made of a flexible, elongate element (21, 23), the length of said element (21, 23) substantially exceeding the width of the web (5) and being arranged to be fed across the web (5) so that new sections of the element will come into contact with the web to ensure correct evening or metering of the supplied coating agent. The coating device according to the invention can be used for transfer coating as well as direct coating.

Abstract: A device for inking a cylinder having depressions therein including a chamber doctor body to which a holder is pivotally connected, the holder being connected to a doctor blade. A force is applied to the holder causing the holder to pivot and force the doctor blade to contact the cylinder. The force may be adjustable aiding in compensating for wear of the doctor blade.

Abstract: A device for applying an adhesive coating to an endless belt in a screen printing machine, and having a trough, a pump for filling the trough to a level such that the meniscus of the adhesive contacts the belt, a doctor blade for removing excess adhesive and a pressure bellows for adjusting the pressure at which the doctor blade contacts the belt.

Abstract: A rotary coater device (12) is provided, comprising front and rear frame plates (30) having mounted therebetween: a die bracket assembly (100), a screen assembly (200), a heater hood assembly (300), and an impression roll assembly (400). The die bracket assembly (100) includes (i) a die (500) positionable within a screen (202) and having an opening (550), the die being movable from an operating position wherein the die opening is proximate to an inner surface of the screen to an idle position wherein the die is drawn away from the inner surface; and (ii) a pivotable support arm (102a) fixedly attached at one end to a positioning mechanism (112) and removably attached at an opposite end to the die, the pivotable support arm being pivotable away from the screen when the opposite end is detached from the die to expose the screen for removal from the coater device.

Abstract: A duplex type coating apparatus capable of applying a coating material to the opposite sides of a moving web while causing the applied coating film to remain identical in thickness on each side has a pair of spaced apart die units disposed at the opposite sides of the web. The web is driven to vertically travel under tension between the dies along a predefined path of travel with a gap defined between each web side and an associated one of the dies. Each die has a liquid reservoir and a transversely elongated slot orifice, or discharge port, at the distal end thereof opposing a corresponding side of the moving web. The dies are operatively coupled to constant fluid feed pumps which supply the reservoirs with a specified amount of coating fluid, enabling the discharge ports to apply an identical amount of coating fluid onto each web surface. The fluid feed amount is chosen such that it is kept equivalent to the product of a preset coat thickness and width as well as the web's traveling speed.

Abstract: Squeegee assembly in particular intended for coating substantially cylindrical objects with a liquid or pasty material, at least comprising an annular squeegee with an outer mounting edge and an inner levelling edge, the latter comprising a ring member and/or ridges substantially extending in the intended direction of movement of the squeegee, the ridges defining grooves, which grooves are designed to form channels with the surface of the object to be coated.

Abstract: For the application of a coating material onto a running material web, particularly a paper or cardboard web, a cylinder guides the web of material while a dosing element extends over the work width and has a surface which together with the cylinder forms an application gap converging in the travel direction of the web. In order to be able to apply various coating materials at high web speeds evenly and without disturbances, even at low application weights, the dosing element is supported swingably about an axis parallel to the cylinder, the radius of its surface guiding the coating material increases continuously in the travel direction of the web up to the dosing line and the surface ends at the dosing line with an edge whose radius is less than 8 mm.

Abstract: A method for coating a web with a coating material by applying a metered coating material onto the web and smoothing the applied coating material evenly onto the web with a flexible predoctoring blade. The coating material is applied to the web by the predoctoring blade in the form of a high velocity laminar flow in advance of the predoctoring blade. The coating mix is fed to a stem part of the flexible blade via an exit channel having a narrow opening. The loading of the flexible blade, acting as a smoothing device, is controlled in a cross direction of the web in order to control the cross directional profile of the applied coating web. The feed velocity of the laminar flow is at least one small m/sec.

Abstract: A cross flow knife coater includes a coating station through which a surface passes and a trough which extends transversely across the desired width of the coating. The trough has an opening through which coating fluid exits onto the surface without using a slot, and first and second transverse ends. The coating fluid is fed directly into the trough at a first transverse end, and is moved from the first transverse end of the trough, across the trough, and toward the second transverse end to cause the coating fluid to flow across the width of the trough while coating fluid exits the opening. The coater creates a spiral flow of coating fluid across the width of the trough which carries debris, bubbles, and other undesirables across the trough to a second traverse end where they can be vented. The perpendicular distance between the trough opening and the surface, and likewise between the knife and the surface, can be adjusted.

Abstract: A solid imaging apparatus and method produces an integral three-dimensional object from a multiplicity of cross sectional portions of the object by selectively exposing successive layers of a liquid photoformable composition to actinic radiation. The apparatus includes a vessel for containing the composition so as to present a free surface, and a movable platform disposed within the vessel below the free surface. Part of the composition is transferred above the free surface by lowering and raising a dispenser at predetermined positions located away from the platform. A doctor blade contacts the composition transferred above the free surface, and then moves over the platform to form a substantially uniform layer of the composition.

Abstract: A spreading system or coating system, preferably for webs of paper or cardboard, with a doctor element fashioned as a doctor blade. A substrate element B to be coated serves as backing for the doctor blade secured in a mounting. A first load system is located near the (exposed) dosing edge of the doctor blade. A further load system acts on the doctor blade between the mounting and first load system. A pressure bar is fastened to the doctor blade in the area of its exposed dosing edge, preferably between 0 and 40 mm away from it, or bears on it, and the first load system acts on the pressure bar.

Abstract: A process and apparatus for coating a surface of an elongated strip article, e.g. aluminum sheet, with a layer of solid polymer material. The process involves heating the polymer to produce a melt having a viscosity of at least 1000 centipoise when measured according to ASTM D4449 at 1 radian per second, extruding the melt onto a moving surface of the strip article through an elongated slot in a coating head having an extended surface adjacent to the slot arranged at an angle to the moving surface to form a coating gap converging in the direction of movement, thereby forming a coating on the strip article, and pushing the coating head towards the surface of the strip article as the melt is extruded as the coating onto the surface from the slot to reduce the coating thickness to a desired range by pressing the extended surface of the coating head onto the coating as the coating is formed.

Abstract: A method of applying a liquid to a flexible substrate and more particularly to a method in which a magnetic liquid or the like is applied to a flexible area so that a thin liquid film is disposed on the carrier for manufacturing an application-type magnetic recording medium. The method includes positioning carrier and a back edge portion of an application head near each other, discharging the liquid from a slot provided in the head and lapping the carrier and the doctor edge portion of the head, located downstream of the slot, with each other at a predescribed lap angle for the application, and thereafter performing the application. The method further includes moving a path roller which is disposed upstream of the head and to adjust the lap angle, discharging the liquid from the slot of the head and moving the carrier to the head. According a further aspect of the invention, a downstream roller is moved in the direction of the carrier to further adjust the lap angle of the doctor edge portion.

Abstract: A coater head has a housing which defines a coating pond supplied with coating under pressure. A plurality of bars extend within the coating pond in the cross-machine direction, and are spaced parallel to one another in the machine direction. A paper web is engaged against a backing roll, and travels through the coating pond past a metering blade which applies coating from the pond to the web. The bars induce a turbulent flow which shears bubbles of air entrained in the coating pond, thereby reducing the bubble diameters and air-induced imperfections in the coating. Greater machine speed, which tends to entrain more air, induces greater shear at the bars which causes bubble size to be more greatly reduced.

Abstract: To knife-coat elastic liquids without the presence of flow instability, the extension rate in the upstream region of the coating bead is kept low by increasing the distance over which the liquid must accelerate. The onset of the flow instability is delayed by insuring that the upstream liquid-air interface of the coating bead is relatively long and flat. This is accomplished by allowing the elastic liquid to pull itself over a relatively large distance out of a trough and into the knifing passage. The liquid is able to ascend into the knifing passage by virtue of liquid tension developed by the extensional flow in the upstream region of the coating bead.

Abstract: A method and apparatus for controlling the coat profile in short dwell time coaters and similar apparatuses in which the coating mix is applied to the web, over a brief time interval, in an application chamber disposed immediately upstream of a doctoring element. Excess coating mix flows counter to the running direction of the web over the front edge of the application chamber. The distance between the web and the front edge of the coating chamber is adjustable, allowing the cross-machine profile of the coating to be controlled.

Abstract: A method of coating at least one liquid medium onto a moving material web, in particular of paper or cardboard, in which method the material web is led either in a first mode of operation along a first treatment path or, in a second mode of operation, along a second treatment path, the material web being led along the first treatment path through a roll gap formed by a primary roll and a secondary roll for indirect coating of the liquid medium via the shell surface of the primary roll, or along the second treatment path over a region of the shell surface of the primary roll remote from the roll gap for directly coating the liquid medium onto the material web in the mentioned region of the shell surface of the primary roll, wherein the primary roll is driven in the one rotational direction in the first mode of operation and in the other rotational direction in the second mode of operation, and the respective general run-in and run-out direction for the material webs is substantially the same in the region of t

Abstract: An adjustable, floor tile mortar and grout spreading device for applying bonding material at a predetermined thickness in an efficient manner, and for spreading grout between floor tiles. The device comprises a telescopically adjustable rectangular frame having a leading edge and a trailing edge and a pair of downwardly extending sides for containing bonding material. The rectangular frame is telescopically adjustable to various widths and can be fixed at a particular width depending upon the size tile for the given installation. In one embodiment, the trailing edge incorporates a downwardly extending trowel blade having a conventional trowel blade edge with either a saw-tooth or square-toothed shape. The trowel blade is adjustable such that the device may be used for spreading various thicknesses of bonding material.

Abstract: The invention relates to a holder for a cradle of a coating bar or for a coating blade in a coating unit and a method for securing the cradle of the coating bar or the coating blade in a coating device. The coating bar or blade are arranged to spread and smooth a size film or a corresponding layer of coating agent onto a face of a moving base to be coated by loading the coating bar or blade against the moving base. The moving base may be a roll of a size press or the web passed over a back-up roll. The cradle of the coating bar or the coating blade is mounted in a holder arranged in an application beam transverse to the machine direction. A journalling duct transverse to the machine direction is formed in the frame of the holder. An oblong member is arranged rotatably in the journalling duct and comprises a cam-like projection of eccentric section. The member can be rotated for the purpose of fixing the cradle of the coating bar or the coating blade in its place.

Abstract: A fountain applicator for applying coating liquid onto a web of paper carried past the applicator, has a coating liquid flow path that includes a curved surface along which a sheet of the coating liquid is flowed to subject the sheet to centrifugal force to cause air entrained in the coating liquid to move away from one side of the sheet that is toward the curved surface, so that the one side is relatively free of entrained air. After being flowed along the curved surface, the sheet of coating liquid is directed toward the web in a free standing jet curtain of coating liquid, to contact the web surface primarily with the one relatively air-free side of the coating liquid sheet to decrease the occurrence of skip coating on the web surface, especially when the web is traveling past the applicator at high speeds. The coating is applied in excess onto the web surface and is metered and leveled to a desired coat weight by a downstream doctor.

Abstract: A metering rod type coating applicator is provided with a metering rod having its peripheral surfaced texture to a texture in a range of Ra 0.06 to Ra 1.6 to improve the application of coating to a moving surface and permit uniform coating application using higher solids content coatings and/or lower coat weights. Preferably, the rod will be rotated at a speed significantly higher than that conventionally used and preferably with a peripheral velocity in the range of about 15 to 20 m/min.

Abstract: A rigid metal housing is positioned downstream of a coating applicator. The housing supports a plurality of positionable contact elements formed of a low friction, high wear-resistant material, which extend inwardly from the housing to engage a slow speed rotating rod. At least one of the contact elements is adjustable to support the rod for stable rotation, and to retain an effective seal between the contact elements and the rod to thereby prevent leakage of clearing/lubricating fluid into the applied coating. The contact elements may be advanced inwardly as the elements and the rod wear, thereby extending the effective life of the rod holder apparatus. Screws may bear against a rear contact element through segmented backing plates allowing refinement of the coat weight along the width of the substrate. Furthermore, an air tube may be positioned between the housing and a rear fixture to adjust overall coating thickness.

Abstract: A metering device for use in a coating apparatus for coating a moving web running over a backing member wherein the metering device includes a metering blade having an edge disposed in close proximity to the web and a profiling device for selectively changing the profile of the blade edge. The profile bar is joined to a plurality of adjustment actuators by bar limiter elements that are mechanically interlocked such that the movement of each limiter element relative to an adjacent limiter element in the direction of bar deformation is limited to a maximum distance. The edges of adjacent limiter elements are provided with interfitted projections and slots with sufficient clearance to permit only limited relative movement of adjacent limiter elements.

Abstract: A device for predosing coating composition on a traveling web of paper. A guide member extends obliquely toward the web. Downstream in the path of the web past the guide member, a doctor element is supported spaced from the tip of the guide member for defining a pressure space between the a guide member and the doctor element. Coating composition is fed through a feed channel between the guide member, on the one hand, and the doctor element and the supports for the doctor element up to the pressure space, on the other hand. An exit slot from the pressure space between the guide member and the web is defined at the tip of the guide member. The guide member has a guide surface down from the tip of the guide member, on the side of the guide member away from the doctor element which faces generally toward the web. The guide surface defines a return channel for coating composition that has moved out of the pressure space and through the slot.

Abstract: A printer system for printing a given pattern on a base board is described which comprises a screen plate to be positioned above the base board. The screen plate has a perforated print pattern defined thereby. A printer proper is employed which includes an ink container chamber and an ink squeezing device. The ink squeezing device runs on the screen plate pressing the same against the base board while squeezing a given amount of viscous ink onto an upper surface of the screen plate. A cleaning device is employed for cleaning residual of ink left on an lower surface of the screen plate and an ink supplier is employed for feeding the ink container chamber of the printer proper with a fresh viscous ink when needed.

Abstract: The invention concerns a coating system for running webs of cardboard or paper which are carried, or backed, by at least two moving surfaces, in which system the coating substance is applied first on at least one moving surface carrying the web and thereafter transferred, in a press gap formed by the moving surfaces, on the web on one or both sides. The invention is characterized by the following features: the moving surfaces are formed by two continuous belts; the belts proceed jointly with the web contained in between successively through a first press gap and through a second press gap, with each press gap being formed by two rolls that are movable relative to each other; the rotatable roll body of each of the rolls of the second press gap is backed against flexure by means of a stationary element; the diameter of the rolls of the second press gap amounts to maximally one-half, preferably less than one-third, of the diameter of the rolls of the first press gap.

Abstract: Apparatus for coating a strip article comprises a coating head having a coating surface and elongated open-sided slot formed in the coating surface communicating with an interior channel for delivery of coating material to said slot for transfer to a strip article to be coated. The slot has a slot extension extending into the coating surface at at least one longitudinal end of the slot for applying coating material to an edge region of the strip article. The slot extension communicates with the interior channel only through a constricted opening that prevents substantial leakage of coating material from the slot extension when the slot extension becomes uncovered by the edge region of the strip article. In this way, the strip article can be coated completely up to its transverse edges, without risk of substantial spillage of coating material if the ends of the coating slot become uncovered by the strip article due to inaccurate tracking or variable strip width.

Abstract: This invention relates to a method and assembly for loading the doctor blade of a doctoring unit used, e.g., in coating a paper web, characterized in that the blade can be loaded close to the edge of the blade without compromising the accuracy of blade profile control. The blade is loaded by backing member (8) having a Z-shaped cross section in which one side of the section forms a base (13), while the middle part forms a waist (18) which turns toward the base (13), and the other side of the shape forms a tip (12) pointing to an opposite direction relative to the base (13) and has at its end a tapering edge suited for pressing against the doctor blade (7). This approach is capable of eliminating the sliding movement of the backing member (8) relative to the blade which tends to impair the accuracy of blade pressure control.

Abstract: A device for coating a material web includes a rotatable applicator roll having a surface for collecting a film of a coating composition thereon. The roll has a length defined by first and second ends thereof and a middle region disposed between the first and second ends. The device also includes a blade having an edge. The blade is attached to a blade holder and extends along the length of the applicator roll. The blade and the applicator roll surface form an acute angle and define a coating composition sump. The blade edge and the applicator roll surface define an inlet gap. A doctor element attached to a doctor element holder is disposed downstream of the blade with respect to a direction of rotation of the applicator roll. The blade, the blade holder, the doctor element, and the doctor element holder define, at least in part, an application chamber. At least one of the elements defining the application chamber has bores or other openings for regulating coating composition thickness on the applicator roll.

Abstract: Squeegee assembly, in particular intended for coating an substantially cylindrical object, such as metal, seamless screen printing cylinders, with a liquid or pasty material, at least comprising two substantially annular squeegees arranged at a distance from each other, between which squeegees material metering means open out for metering a material to be applied to the object to be coated; which squeegees can form part of a wall which is resilient, at least in places, of an annular squeegee pressure chamber, which is provided with pressure fluid supply means, while an annular material-supply chamber may be present in the squeegee pressure chamber which is provided with openings which open out between the squeegees, and also comprises a material supply which can be connected to a material source.

Abstract: This invention improves a machine that has a squeegee-like blade that wipes across an apertured mask to apply to a printed circuit board solder paste or other conductive mounting material. The apparatus and method of the invention involve reciprocating the blade back and forth transverse to the direction of blade sweep across the mask, during the material-applying sweep of the blade across the mask. The reciprocating movement of the blade, combined with the sweep movement, deposits material onto the printed circuit board with high fidelity and with minimal voids.

Abstract: The aim of the invention is to make it possible to vary independently of each other, i.e. better and more freely, the basic parameters in the design of a squeegee used as a flexible-plate doctor blade in a coating-material spreading device. These parameters may include the length of the chamfered surface in contact with the surface to be coated, the resistance to bending strain parallel to the spreading edge of the blade and the resistance to bending strain at right angles to the spreading edge of the blade. This aim is achieved by virtue of the fact that the flexible-blade doctor blade (squeegee) proposed does not have a constant thickness but is made up of two or more different cross-sections with steps parallel to the dosing edge, thus giving the flat sides of the doctor blade a substantially terrace-like structure. The blade may also have grooves parallel to the dosing edge.

Abstract: Paper or cardboard webs are coated by dipping an applicator roll in the liquid coating material and forming a uniform coating on that roll with a grooved doctor bar before applying the coating to the web against a drum. Thereafter, any excess is removed from the web by a doctor blade which is pressed against the web while it is on the drum.

Abstract: An apparatus and method for applying a coating to glass including a support surface for supporting a glass pane, a print screen having a screen support frame defining a perimeter of the print screen disposed above the support surface to apply a coating over the print screen. The print screen is deflected into contact with the glass pane at predetermined points thereon and the coating is moved over the print screen to deposit the coating on the predetermined points on the glass pane when the print screen is so deflected. The apparatus also includes a vapor manifold having a predetermined width disposed within the perimeter defined by the screen support frame and coupled to a source of vapor. The vapor manifold distributes a vapor blanket over the print screen and the glass pane, thereby reducing the rate at which the coating on the glass pane dries and impede evaporation of the coating from the print screen.