Abstract: A method and apparatus for coating a traveling paper web includes a coating applicator disposed in movably-controlled spaced adjacency with the paper web, which is supported on a rotating backing roll. The coating applicator permits a controlled introduction of a fresh portion of an aqueous slurry of coating material which is mixed with a recirculated portion of coating material in a controlled manner to prevent the formation of large vortices within the coating applicator. The coating material flows successively through mixing, convergent, and recirculation channels, all of which are defined on one side thereof by a distinct surface of a flow stabilizer which is positioned centrally in a cavity in the coating apparatus.

Abstract: In a coating method and apparatus for applying coating liquid onto a web, the coating apparatus includes a rotating member rotatable and contacting with the web; and a support member supporting rotatably the rotating member and including a liquid reservoir formed between the rotating member and the support member, a fluid supply pipe, a cavity filled with the coating liquid and connecting to the fluid supply pipe, and a slit communicating the cavity with the liquid reservoir. The rotating member is supported by a fluid pressure of the liquid reservoir and the coating liquid supplied from the liquid reservoir forms a bead of the coating liquid by the rotating member between the web and the rotating member. The rotating member is floated uniformly in the widthwise direction by the fluid pressure so as to keep a predetermined clearance away from the support member to provide a stable coating. The bead is made uniform in the widthwise direction under any conditions.

Abstract: Coating devices for application of coating material to the surface of a web or a flexible substrate utilizing the study of flow patterns in blade coating to develop high-speed coaters, wherein the coater may be modified to provide an air layer between the coating liquid and any lower boundary. The coater devices of the described embodiments provide two inlet channels and an outlet channel. The first inlet channel carries the coating liquid, and the second channel can be used to pump the carrier fluid, e.g. air, into the coating head to pressurize the chamber and to keep the contact wetting line at the upstream section attached to the substrate. The air layer serves as a carrier fluid removing the wall shear stress on the coating liquid in the channel, and thus the coating flow for the operation of the device may proceed without flow separation from the wall (i.e., in a vortex-free mode) at relatively low flow rates appropriate for commercial applications.

Abstract: An application unit for directly or indirectly applying a fluid or pasty medium to a continuous material web, particularly one made of paper or cardboard, includes a beam that extends across the entire length of the application unit, and a distribution pipe arranged within beam. The pipe is connected via through-flow openings to a feed duct merging into a metering gap forming a free-jet nozzle. The pipe may alternatively be coupled to an application chamber. The through-flow openings are arranged in an upper portion of the distribution pipe and at least one discharge opening for fluid or pasty medium is provided at any one or more other portions of the distribution pipe.

Abstract: A process for forming an abrasion resistant sheet which comprises forming a web of cellulosic fibers on a papermaking machine and applying a slurry including an abrasion-resistant grit to the upper surface of the web on the papermaking machine using a slot orifice coating head applicator, said grit being uniformly distributed on said surface of said fibrous cellulosic overlay sheet at a coat weight of about 2 to 40 pounds per 3000 square feet.

Abstract: A nozzle and processing method thereof which provides suppression of vertical stripes due to foreign matter or aggregates in the paint or dust deposits on the base material. In one embodiment of the present invention the nozzle includes an upstream lip, a downstream lip in a curvature shape projecting to the base material side, and a slit formed by the upstream lip and downstream lip. A side edge of the downstream lip is formed in a curvature shape having a radius of a curvature in a range of 4 to 45 .mu.m, and by this edge, even a paint of high viscosity which hardly flows can smoothly flow into the gap between the downstream lip and base material. Aggregates in the paint or dust deposits on the base material therefore are not caught in the edge.

Abstract: A coating edge limiter for a coating arrangement with a short dwell time. Color is fed under pressure into a coating chamber formed by a backing roll around which a paper web is guided, a barrier wall, a doctor blade element and sealing blocks located at both ends of the coater. A formatting plate almost completely covers an application zone between the doctor blade element and the barrier wall so that an edge region of the web is sharply delineated and kept completely free of color. In each of the sealing blocks water is supplied via channels to depressions thereby forming a pressure cushion. This pressure cushion prevents the pressurized color in the coating chamber from flowing out laterally and ensures that the formatting plate is pressed flatly against the web. The coating edge limiter thereby makes it possible to establish very precisely the width of the web to be produced.

Abstract: A coating method and apparatus for applying a liquid coating solution containing suspended particulates to a moving web which eliminates areas of stagnation in the reservoir pan thereby resulting in a relatively even application of the particulates to the web. The web is continuously passed through the reservoir pan while supported on a rotatable backing drum. The liquid coating solution is delivered to the coating pan through a distribution conduit a distribution conduit disposed within the reservoir pan generally parallel to the discharge weir of the reservoir pan. The distribution conduit includes a plurality of spaced apart orifices therein to deliver the liquid coating composition in a pair of end streams and a plurality of intermediate streams traveling toward the discharge weir. The distribution conduit is fed from both ends thereof resulting in the end streams flowing at a greater velocity than the intermediate streams.

Abstract: A flow control device for a solder wave apparatus that includes an outlet or nozzle from which molten solder flows in an upward direction to contact the lower surface of a target, such as a circuit board. The flow control device provides a screen and baffle that control the flow pattern of molten solder to the nozzle so as to result in a near-parallel solder wave above the nozzle. The screen includes a pair of spaced-apart parallel panels that are disposed upstream of the nozzle. Each of the panels has apertures through which the molten solder flows before entering the nozzle. The apertures of the panels are offset from each other, such that none of the apertures are coaxial but instead overlap each other when superimposed. The baffle is disposed further upstream of the screen, and includes a number of fins disposed substantially perpendicular to the panels. The fins are arranged such that their lengths become progressively shorter in a direction away from the center of the baffle.

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: In a duplex type coating apparatus, a left-right pair of dies and are disposed on opposite sides of a carrying path of a web, the dies and are each made up of an upper member and a lower member, a tip part of the lower member projects further toward the carrying path than a tip part of the upper member, and coating liquid discharge passages are inclined in the direction of the carrying path of the web. As a result, because the same amount of coating liquid is discharged from each of the dies and coated onto each side of the web, it is possible to carry out coating at the same coating thickness and in the same position on both sides of the web.

Abstract: An assembly, for preventing striping in an applicator used for coating a paper or paperboard web, comprising a doctor blade suitable for metering and smoothing a coat to be applied, a cross-machine elongated application chamber adapted immediately in front of the doctor blade, one of the sides of the chamber being formed by the web being coated. A flexible leading blade forming a front sealing edge of the chamber has a perforated stem with openings to allow coating mix from the application chamber to travel in front of the leading blade. A homogenizing chamber is formed in front of the openings in the leading blade using a dam lip or similar flow barrier. The flow exiting the openings of the leading blade is homogenized in the homogenizing chamber as the flow impinges against the flow barrier.

Abstract: A coating apparatus including a slit die 4 for applying a liquid to a surface of a resin film. The slit die 4 ha a die body which is rotatable between an operating position whereat an injection nozzle 13a of the slit die 13 faces a back-up roller 2 for feeding the resin film 50 and a rest position where the nozzle 13a is spaced from the resin film or foil 50. A cleaning device is provided having a roll 40 of a cleaning sheet 41, a take-up roller 23 for taking up the cleaning sheet, and a cleaning roller 24, on which the cleaning sheet moves. The cleaning sheet 41 on the cleaning roller 24 faces the injection nozzle 13a of the slit die when the latter is in its rest position for executing a cleaning operation. After an application of the liquid to a front surface of the resin film, the liquid is also applied to a rear surface of the film, so that the applied layers 50a on the front surface are registered with the applied layers 50b on the rear surface.

Abstract: A coating apparatus 10 is disclosed, which comprises a slot 18 and a chamber 17 formed upstream the slot 18 such as to distribute a coating liquid 12 in a coating width direction. The coating liquid is coated such that it is pressed against a web 11 as it is discharged from the slot. The slot gap H of the slot and the slot gap error .DELTA.H in the coating width direction satisfies a relation.DELTA.H/H.ltoreq.0.05and the pressure loss Pb of the coating liquid flowing in the chamber in the coating width direction, and the pressure loss Ps flowing in the slot satisfies a relation as follows.Pb/Ps.ltoreq.0.

Abstract: A die coating apparatus includes a die having an upstream bar with an upstream lip and a downstream bar with a downstream lip. The upstream lip is formed as a land and the downstream lip is formed as a sharp edge. A low surface energy covering is applied to the surface of the downstream bar adjacent to the sharp edge, and to the surface of the land, adjacent to its downstream edge. This presents a generally undulating surface. The low surface energy coverings need not extend completely to the edges of the downstream bar and the land.

Abstract: In a coating device, a nozzle is configured by combining a front block and at least one back block. A front block includes a portion which is projected toward the base member with respect to the back block, and a top face of the projected portion is processed into a curved face having a predetermined curvature radius. A top face of the back block, which is opposed to the base material, is processed into a flat face, and a plurality of discharging openings are provided therein for discharging a coating material therethrough. The base material first travels along the curved face of the front block. The base member then travels over the flat face of the back block substantially in parallel with the flat face, while the coating material is discharged through the discharging openings, thus forming a stripe-shaped coating film on the surface of the base material. A line width and a thickness of the thus formed stripe-shape coating film is controlled to stay at designed values and fluctuation thereof are eliminated.

Abstract: A breathable laminate comprises at least two porous webs laminated together with a porous adhesive matrix, preferably a random fibrous adhesive pattern having a coat weight of between 1.5 and 12 grams per square meter. The two or more porous webs comprise woven or non-woven materials and the resulting breathable fabric or laminate has good hand and flexibility. Breathable fabric is adhered to foam by such random fibrous adhesive patterns of similar coat weights. Coating widths of up to 80 inches or more are produced in a slot die fed by a selected plurality of recessed lands within the die, with motors and pumps controlled to maintain consistent, uniform coat weights regardless of coat widths and substrate speeds selected. Single ply coated webs, apparatus and methods are disclosed.

Abstract: Apparatus for the application of at least one liquid medium onto a moving material web, in particular of paper or cardboard, including an application mechanism (3) for the liquid medium and a roller (2) associated with the application mechanism for receiving the liquid medium in the case of an indirect application or for guiding the material web in the case of direct application, the application mechanism (3) including a dosaging blade (4) and a damming strip (7) arranged at a distance from the dosaging blade as seen against the direction of rotation of the roller (2), the damming strip together with the dosaging blade defining an application chamber (6), a running-off surface (8) over which the excess liquid medium flows out of the application chamber (6) and over the damming strip (7), and wherein the dosaging blade (4) has a blade holder (5) with a base strip (5b) mounted in the application mechanism (3).

Abstract: Welding electrodes are continuously coated with a flux material with this pressure coating system. The flux material is supplied to the coating station by two supply bins which are automatically controlled such that the flux material is always supplied to the coating station. While one supply bin is supplying the flux material to the coating station the other bin is being replenished in an alternate manner.

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 slide die coating method and apparatus includes a die having an upstream bar with an upstream lip, a manifold bars a downstream bar with a downstream lip, a vacuum bar, and a slide surface. The upstream lip is formed as a land and the first manifold bar is formed as a sharp edge. The coating fluid exits the die from a passageway and slides along the slide surface to form a continuous coating bead between the manifold bar sharp edge, the upstream die lip, and the surface being coated. The shape of the land conforms to the shape of the surface being coated. The die can include multiple passageways for coating multiple layers.

Abstract: A device for application of a minimum quantity of fluid to a web of goods of a given width, wherein application takes place by means of an application beam in which the fluid is distributed uniformly over the working width through a plurality of fluid lines that branch in the manner of a tree trunk. The outlet openings of the lines terminate in a slot that is open facing the web, the length of the slot being delimited by two lengthwise edges. These edges press against a pressure roller located on the opposite side, i.e the back of the web. By means of these lengthwise edges, as the web passes though, its nap is compressed twice, once at the beginning of application with a first lengthwise edge, after which the nap stands up again in the slot and is saturated with the fluid, and again at the end of the application, after which the web is finally squeezed against the second lengthwise edge.

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: A system for coating a substrate with ultra-thin layers in stripes includes moving the substrate through a coating station and forming a composite layer including coating fluids and a carrier fluid. The composite layer flows at a rate that is sufficiently high to form a continuous flowing fluid bridge of composite layer to the substrate surface and to contact the substrate with the flowing composite layer to interpose the coating layers between the substrate and the carrier fluid. The carrier fluid is removed while leaving the coating fluid deposited on the substrate as a coating layer.

Abstract: A method and a device for producing thin layers from liquids to form coatings or foils. A substrate and a liquid application point are moved relative to each other and during the movement the liquid is applied at the application point onto the substrate, while forming a liquid strip, in an amount which is greater than is necessary for the formation of the liquid strip. The excess liquid is guided from the application point to the removal point against the outlet direction and the formed liquid strip is allowed to solidify.

Abstract: The present invention provides an enclosure for a coating apparatus, the coating apparatus being of the type comprising a coater face adapted for the flow of a fluid thereover. The fluid flows over the coater face in the form of a film having one or more edges contacting the coating apparatus at one or more "edge contact surfaces." The enclosure defines a partially enclosed space above one or more of the edge contact surfaces. The atmosphere within the partially enclosed space can be at least partially saturated with solvent vapor to prevent or inhibit drying of coating fluid at the edge contact surfaces. Also, the enclosure has a shape that allows visibility of and access to a substantial portion of the coater face of the coating apparatus.

Abstract: Wave soldering or tinning machine comprising:a solder reservoir;a means that forms at least one solder wave having a laminar form and including a flat surface;a means for bringing a piece to be soldered or tinned into contact with the laminar wave; andmeans for injection of a gas in the vicinity of the wave comprising an injector located in a position adjacent to and downstream from the wave and provided with a wall facing the solder wave, wherein the wall has at least a first group of openings positioned so as to produce a first gas jet directed toward the flat surface of the solder wave.

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 applying a liquid medium has an application slot whose width of opening is defined by the mutual spacing of its longitudinal edges, and means for feeding liquid medium to the application slot. The width of opening of the application slot is adjustable between a maximum width and a closed position permitting the medium to be precisely cut off when the application operation is concluded by closing the slot.

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: There is provided a coating apparatus capable of achieving high-speed coating and a decrease in thickness of a coating film and obtaining a preferable coating film. In an extrusion type coating apparatus including a die having a coating material reservoir to which a coating material is supplied, the coating material being coated on a continuously traveling support member while the coating material is extruded from a slit formed in a tip of the die, a magnet portion having adjacent tip portions to form a magnetic gap is arranged such that the magnetic portion and the tip portion of the die face each other to interpose the support member therebetween, and upper and lower lips defining the slit at the tip of the die are arranged out of contact with the support member.

Abstract: A coating device has a first half and a second half located adjacent the first half to form a slot between the first and second halves. A porous material, having a thickness greater than the height of the slot, is disposed in the slot to compress uniformly along its width. The porous material has a porosity and a height selected in combination with each other to create a predetermined pressure drop through the slot and to maintain the pressure drop to create the desired flow rate along the slot width. The size of the pores in the porous material can be less than 25 .mu.m and the exit pressure drop through the slot can be at least one thousand times greater than could be obtained without the porous material.

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: The present invention is an improved flywheel for damping vibrations in a coating roll. The improved flywheel has an inner plate and an outer plate and sandwiched between the two plates are alternating rings of a solid body material such as aluminum or steel and conventional vibration damping material. Typically, the flywheel is attached to the coating roll outside of the bearing mounting block. The flywheel is designed such that movement of the inner and outer plates relative to each other works to compress the damping material sandwiched between the two plates. The plates are fastened together so that torsional motion between the plates, alternating rings, and coating roll is prevented. This compression of the damping material results in the absorption and dissipation of vibrational energy of the radial bending of the coating roll.

Abstract: A substrate coating apparatus includes a stage, a coating liquid tank, and a moving mechanism. The stage holds the substrate to be vertical or inclined. The tank has a hollow body extending along the widthwise direction of the substrate, with opposing ends closed. The tank has a protruding front end surface which can be positioned facing the substrate surface to be coated. The tank has an outlet path having an opening over the width of the area to be coated, and an inlet opened in the tank below the outlet. The moving mechanism holds the tank such that the front end surface thereof faces the surface of the substrate, with a prescribed space, for example, 0.1 to 0.3 mm, therebetween. The moving mechanism moves the tank vertically relative to the substrate, from a start position to an end position, while the predetermined space between the tank and the surface is maintained. The front end surface of the tank has a lower edge positioned between the outlet and the inlet of the coating liquid outlet path.

Abstract: The present invention is directed to a coating device for application of coating material to the surface of a web or a flexible substrate. The coating device contains a pressurized channel where a flowing stream of the coating liquid first comes into contact with the substrate. The coating liquid enters the channel at the upstream side and wets the substrate as it flows in the same direction as the substrate. A doctor element is positioned at the downstream side of the channel where the excess coating in the channel follows the contour of the boundary formed by the doctor element and leaves the channel. The geometry of the streamlined boundaries of the coating device eliminate the formation of recirculating eddies or vortices. The elimination of vortices eliminates flow instability due to centrifugal forces and removes harmful pressure fluctuations which could result in coat-weight nonuniformities.

Abstract: Air entrained within the pond of a coating applicator is influenced toward a designated region for removal. The region is formed by a recessed air collector which sets up a high-recirculation, low-pressure zone within the pond. Entrained air bubbles migrate to the collector. The collected air and excess coating is drawn out of the collector cavity by a plurality of perforations which discharge to a collection cavity at a lower pressure or partial vacuum. The collector structure may be employed in various coater/size press configurations.

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: A cross-head die for applying one or more layers of coating materials to a single, longitudinally fed, filamentary member, or to a plurality of such members in spaced, side-by-side relation. Tip and die members of relatively flat, wafer-like configuration are placed in a cylindrical cavity of the body member of the apparatus with central openings in each of the tip and die members coaxially arranged and a protrusion surrounding the opening in the tip extending into the opening in the die. Flowable coating material is injected through a radial opening in the body member and flows in both directions about an annular passageway formed by cooperatively arranged grooves in the peripheries of the tip and die members. The coating material flows from the annular passageway to the die aperture through opposing, spaced, angularly arranged surfaces on the tip and die members.

Abstract: A coater is provided for coating objects with a liquid material. The coater includes a flume that has an entry and an exit end, a supply of liquid coating material upon which the objects float, and a circulation system. The circulation system delivers the liquid material to the entry end of the flume so that the liquid material flows toward and out the exit end. The coater also includes a conveyor that loads the objects into the flume and a conveyor that receives the objects at the exit end of the flume.

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 cross-head die for applying one or more layers of coating materials to a single, longitudinally fed, filamentary member, or to a plurality of such members in spaced, side-by-side relation. Tip and die members of relatively flat, wafer-like configuration are placed in a cylindrical cavity of the body member of the apparatus with central openings in each of the tip and die members coaxially arranged and a protrusion surrounding the opening in the tip extending into the opening in the die. Flowable coating material is injected through a radial opening in the body member and flows in both directions about an annular passageway formed by cooperatively arranged grooves in the peripheries of the tip and die members. The coating material flows from the annular passageway to the die aperture through opposing, spaced, angularly arranged surfaces on the tip and die members.

Abstract: Disclosed is a method of coating a substrate having a center-line average roughness Ra of not less than 0.3 comprising steps of:(a) conveying said substrate, and(b) coating said substrate while conveying said substrate with a coating solution under a coating condition defined by a capillary number Ca represented by Formula 1, wherein said capillary number Ca satisfies an inequality represented by Formula 2: ##STR1## wherein U represents a substrate conveyance speed in terms of cm/sec, .mu. represents a viscosity of said coating solution in terms of dyn-sec/cm.sup.2, and .sigma. represents a surface tension of said coating solution in terms of dyn/cm.

Abstract: An extrusion coating device comprising a die having its distal end composed of an upper lip and a lower lip and having a slit provided between the upper lip and the lower lip, for extruding a paint through the slit to apply the paint onto a flexible support continuously running along distal end surfaces of the upper lip and the lower lip is disclosed. The distal end of the lower lip of the die is constituted continuously from the slit by a planar portion, a first curve portion and a second curved portion. An inclination angle of the planar portion, a radius of curvature of the first curved portion, and a radius of curvature and a center of curvature of the second curved portion are set within predetermined ranges, respectively. Thus, with this coating device, a coated film of satisfactory shape having no coating irregularity or stripe can be formed even when high-speed coating and reduction in coating thickness are carried out or when dusts and particles are attached on the support surface.

Abstract: A coating device for applying a thin wet film to a carrier has a slit die on which at least one flexible lip comprising a flat strip is firmly clamped. The flat strip projects beyond a leading edge of the slit die and is fixed by a clamping strip which is screwed to the inclined outside of a rigid upper lip of the slit die by means of a clamping screw. A locking pin arranged parallel to the clamping screw in the upper lip penetrates the lip and fixes it in its position together with the clamping screw, which also penetrates the flexible lip.

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: 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 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 doctoring of excess coating liq

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: The center line average roughness (Ra) of the slit inner surfaces is made in a predetermined range of 5.0 .mu.m according to the present invention, and the straightness (W1) in the delivery direction of the coating solution thereof and the straightness (W2) in the perpendicular direction to the delivery direction thereof are made in predetermined ranges respectively in preferred embodiments. Thereby, development of wrinkles and inclined elongation in the tape itself are prevented when wound on a roll, the productivity is increased, and the product quality is improved.