Abstract: A solder paste applicator for applying solder to a selected area of a printed circuit board on which electronic components are mounted. The applicator includes a housing with a plate mounted in one end. The plate has a pattern of holes through it corresponding to the pattern of solder to be applied to the board. The housing has movable legs mounted to the outer surface for positioning the plate a distance from the surface of the board which corresponds to the thickness of the solder to be applied. The solder is held in a reservoir above the patterned plate. A piston is positioned in the housing and is pushed against the reservoir for dispensing the solder.

Abstract: A coater for coating a running paper or carboard web comprises a coating chamber having one side open against the web and means for filling the coating chamber with pressurized coating substance. The coating chamber is limited in the longitudinal direction of the web by a web entrance wall, and opposite thereof, a back wall in the form of a doctor member for forming a coating layer on the web. The distance between the walls is so short that, at normal web running speed, the web moves from the web entrance wall to the back wall in a time of at the most 0.3 s, preferably at the most 0.03 s. Coating substance is supplied by means of positive pressure to the coating chamber at a position close to the web entrance wall.

Abstract: In a process and a device for the impregnating and/or coating application of liquid, optionally foamed substances, through a slot the parts of the device performing the application are arranged to form a surface almost plan-parallel to the surface of the sheet material to be subjected to the application so that the trailing end of the application device is supported by the sheet material. Between the application device and the surface to be coated, a hydraulic pressure is generated which floatingly supports the device and which has a uniformizing effect on the application layer.

Abstract: Directed to a device for spreading an adhesive uniformly across a strip material comprising a container for strip to be coated, a pressurizable container for holding the adhesive, which is preferably a thermo-setting epoxy, a flexible tube connecting the adhesive container to an applicator head leading through a positive displacement meter. A feeder roll actuated by withdrawal of strip from the device operates the meter such that adhesive is applied only when strip is being withdrawn. The applicator head is provided with a slot through which adhesive is supplied from the interior of the applicator.

Abstract: An apparatus for the application of foam flux in a system for soldering printed boards, including a flux tank, a partition possessing a top portion rising above the fixed level of flux liquid and containing near the bottom portion thereof a perforated portion, serving to divide the interior of the flux tank into an inner tank portion and an outer tank portion, and a plurality of porous tubes disposed inside the inner tank portion having one end thereof communicating with an external compressed air feed mechanism and the other end thereof closed, the improvement wherein the porous tubes are porous ceramic tubes and are each obtained by molding an aggregate of uniform and fine ceramic-forming particles into the shape of a tube with the aid of an organic plasticizer and an inorganic binder and calcining, the porous tubes possessing pore diameters in the range of 10 to 30 microns and a porosity in the range of 35 to 55%.

Abstract: Coating apparatus is provided for use in coating a sheet of goods which is carried on a counter-roller. The coating apparatus includes a coating zone which is formed along the sheet to be coated. At least one deflector is provided in the coating zone for deflecting the return flow of coating material deflected at the coating blade to a divergence angle of less than 90 degrees relative to the emerging flow of fresh coating material from the outlet port of the chamber containing the coating material. In general, angle of divergence between the two opposing flows of coating material is less than 60 degrees. In this manner, the amount of agitation and turbulence in the flow of material is minimized.

Abstract: A tool employing a solder foot to deposit solder on a series of conductive surfaces as the tool moves. In one embodiment, non-wettable blade attached to the tool breaks the film. A pair of sensors coupled to a control circuit monitor the position of the solder foot and the position may be changed as a function of the operation to be performed, i.e. deposit, reflow, standby while tool is moved. In a second embodiment a discrete solder mass is extruded and deposited on a preheated pad. In a third embodiment, solder wire is delivered to an ominidirectional tool for deposition.

Abstract: A coating method and apparatus in which a freely falling film of a coating solution is applied to a web moving along a continuously rotating backing roll. The film width is wider than that of the web. The coating solution is removed from the backing roll by a cleansing device such as one that applies a solvent to the backing roll and then suctions the solvent and coating solution from the backing roll.

Abstract: Formed on the doctor element, between a chamber mouth and the paper web respectively the backing roll supporting it, is an application space which relative to the doctor element, that is, on the entrance side of the paper web, is defined by a baffle plate and kept at a pressure which exceeds atmospheric pressure. Between the baffle plate, this application space 2 is subdivided toward the doctor element (coating blade) 1, creating between the end of the vane 2 and the coating blade 1 a gap whose width ranges between 4 mm and 10 mm. This makes it possible to produce a flawless coating application also in the case of very light basis application weights.

Abstract: Coater for coating a material web, in particlular a paper web, guided along a backing roller, with a chamber for receiving the coating material, a doctor blade located where the web leaves the chamber, seen in the direction of travel of the material web, an adjustable overflow plate located at the front end of the chamber and with sealing members arranged in the edge region of the backing roller, covering the edges of the material web, comprising recesses extending in the direction of the web, edge scrapers extending in the direction of travel of the web from in front of the overflow plate to immediately in front of the doctor blade, with a channel and compressed air supply opening in the region of the overflow plate.

Abstract: Apparatus and method for dispensing fluid material whereby the fluid is discharged from a nozzle onto a workpiece. Delivery of fluid to the nozzle is controlled by a metering valve located in close proximity to the nozzle. The flow of dispensed fluid is sensed by a pressure transducer disposed to sense the pressure drop across the nozzle. The pressure transducer generates a feedback signal which can be applied by way of a closed loop control system to an electropneumatic servovalve which operates a double-acting air cylinder the pressure drop across the nozzle thereby controlling the flow of dispensed fluid in accordance with a driving signal. Where the dispenser is carried by a robot, the driving signal can be correlated to the relative speed between the workpiece and the nozzle to accurately control the amount of fluid per unit length contained in a bead deposited on the surface of the workpiece.

Abstract: In a device for coating a web of material that travels around a backing roller, the device having a coating chamber that opens toward the backing roller, that extends over the operating width, that has a slot demarcated at the web-intake end by an overflow plate for supplying liquid coating, and having a flow-control system at the downstream end, the improvement which comprises structures defining a coating-guide channelthat extends over the operating width at the outlet end of the coating chamber and terminates just upstream of the flow-control system,that is demarcated at one end by the backing roller and at the other by a baffle that essentially parallels the surface of the backing roller,that extends along the direction of travel at least 50% of the length of the overflow plate plus the flow-control system,that is open along its width perpendicular to the axis of the backing roller from 1.5 to 15% and preferably from 2.5 to 5% of its length, andthat terminates just upstream of the flow-control system.

Abstract: An application apparatus for applying a flowable coating mass, in particular a hot-melt adhesive, to the surface of a substrate comprises a housing for a reservoir for the coating mass, a heating means for heating the coating mass and a conveying means for supplying the heated coating mass via a line from the reservoir to an application head. As a separate unit with a closed housing control means is provided which guided on rails is detachably secured to the housing. The electrical control means is connected via an arrestable electrical plug-type connection to the housing.

Abstract: Treating flexible sheet material, including paper, using vacuum guides adjacent to short-dwell applicators intimately contacting the sheet, provides improved application of fluid treating composition, particularly at high speeds.

Abstract: Arrangement for the coating of a running web (2), for instance a paper, a cardboard or a like web, by means of a so-called short dwell applicator (18), in which the paste supply, the paste doctoring and levelling of the supplied coating layer are carried out in the same arrangement and the amount of the excess supplied paste is collected for a recirculation. The arrangement comprises a rear edge seal (9, 12) and fore distributor (6, 15) so arranged that the coating paste is supplied on the web there, where the last quoted arrives in the arrangement, and then the paste flows mainly in the direction (22) of the material web (2) until it meets a doctor (3). The amount of supplied paste (1) is big compared to the amount of paste, which attached and levelled follows along with the running material web (2).

Abstract: An extrusion-type fluid applicator having a front wall located in upstream from a rear wall relative to a moving support (substrate) on which the applicator coats a liquid through a slot between the two walls. The front wall is convexly curved toward the support. The rear wall is retreated away from the convex surface of the front wall in a direction opposite the support. The slot is tapered to decrease the width thereof toward the support.

Abstract: A die bonding method using an adhesive agent for fixedly mounting a semiconductor chip on a substrate of a lead frame, wherein a needle for discharging adhesive agent is moved near the substrate to apply the adhesive agent onto the substrate, and thereafter, the needle and substrate are initially moved apart at a first velocity and then at a second velocity greater than the first velocity.

Abstract: A coating device for coating moving material webs running over a backing roll has a front wall, coating element, and side seals cooperating to provide a sealed application space for the material web near the backing roll, which application space is preferably at a pressure above atmospheric pressure and has a coating mixture flowing therein from a chamber. A baffle connected to the front wall provides a run-out gap therebetween and cooperates with the backing roll to provide a hydrodynamic pressure gap at the material web run-in side, such that coating mixture from run-out gap is entrained by the speed of the material web for reintroduction to application space through hydrodynamic pressure gap.

Abstract: A die, preferably one with internal metering pumps for applying an extremely uniform coating to a traveling web, is mounted over a pair of very rigid side plates. Horizontal surfaces of the plates support linear slides which in turn support the die through uprights. The slides have preloaded bearings to allow a linear movement of each upright with no lost motion. Pneumatic cylinders move each upright along its slide independently of the other upright. Adjustable stops set the die-to-web spacing when the cylinders draw the uprights, and therefore the die, toward the web. Other air/hydraulic cylinders drive the uprights away from the web, against the action of the main cylinders, to jump splices in the web. The system preferably includes an outrigger arm extending from each upright to a pair of auxiliary linear slides mounted on the side face of each side plate to relieve side loading on the main linear slides.

Abstract: A system for applying one-part thermal-cure material, such as structural epoxy, includes apparatus for heating or cooling the epoxy to a temperature above or below ambient. A spirally coiled tube is suspended within a hollow enclosure by tube end fittings extending from axially opposed ends of the tube. An electrical heater and temperature sensor extend from opposed enclosure ends into the tube coils approximately centrally of the enclosure. The enclosure is filled with a heat transfer fluid that surrounds the coiled tubing. The fluid is connected through an inlet and outlet in the enclosure endwalls for circulation externally of the enclosure through a fluid chiller. A microprocessor-based controller receives input signals from the temperature sensor and a temperature adjustment mechanism, and provides outputs to the heater, chiller and heater-exchange fluid pump and circulation valve, and to alarm mechanisms for indicating a high-temperature or low-temperature alarm condition.

Abstract: Apparatus for applying a thin coating to a web in which the outer end of a die assembly is moved into interfering relationship with the outer elastomeric position of a backing roll so that coating material supplied to said die assembly pocket of coating material covering a discharge orifice in the outer end of the die assembly.

Abstract: A system and process, including a combination of a solder well and a vacuum system wherein micro through holes are filled with solder. A PC board or the like is supported for contact with solder on one side and with a vacuum apparatus for the application of a vacuum to the other side so that solder is drawn into the through holes for establishing electrically conductive connections therethrough.

Abstract: The invention relates to a method and an apparatus for continuously applying a uniform coating to a material web (5), in particular a paper or cardboard web, travelling over a back roller (6), to which the coating material is applied at low pressure by means of a coating roller (2) and with guidance by a guide plate (8) into the coating gap (7) formed by the back roller and the coating roller, whereupon the coating material is metered by a metering member (15) and in the region of a layer close to the material web is partly drained in order to form a barrier layer and final metering takes place in a final metering device (23) by means of a final metering member (24) with low contact pressure. Due to a three-stage method of this type and the apparatus suitable therefore, even at comparatively high material web speeds, constant good coating qualities can even be achieved with extremely low coating weights.

Abstract: Method and apparatus to apply a coating or coatings of a predetermined thickness over designated sections of a continously advanced elongate member by means of cooperating guide die and coating die segments. The die includes two abutting members through which, the article to be coated, passes the first member defining a guide passage and the second being in the form of a collar defining a coating groove for distributing the coating material and limiting its thickness. Since the two parts are separable cleaning is facilitated.

Abstract: Uniformity of hot melt coatings on thermally sensitive plastic and other webs is maintained by use of a silicone or other rubber-like web back-up roll the dimensional stability of which is maintained during hot melt coating of the webs by a heat-conducting idler roll directly contacting the back-up roll temperature and a heat transfer source for temperature deficiencies on the silicone roll surface, aiding constant nozzle-to-web spacing irrespective of temperature variations and line speeds. Provision is also made for the introduction of chilling, if required.

Abstract: A coating apparatus, for applying a coating substance to a paper web, has a chamber from which the coating substance is supplied via a slit type mouth communicating with an applicator space which is defined by the paper web and a doctor blade element. At the web, on the side of the applicator space from where the paper web enters, a throttling passage is formed by a back-pressure element in such a manner that a stream of excess coating substance issues from the applicator space via the throttling passage and abruptly separates from the web and in so doing flows away from the web predominantly as a film thereby preventing completely or almost completely the admission of air into the applicator space by the air boundary layer adjacent the moving web.

Abstract: A short-dwell coater coats a web positioned against a backing roll with coating mix. The coater comprises a front lip as a part of the coater support structure, a feeder device adjacent the front lip for feeding the coating mix onto the paper web, a mouth piece (4, 5) forming an extension of the feeder device and forming an application zone (8) against the web (9), and a doctor blade mounted rearward of the application zone with respect to the forward machine direction. This blade doctoring the excess coating mix away from the web. The coater further comprises an intermediate lip (6) positioned between the feeder device and the doctor blade in conjunction with the front lip and forming together with web a space capable of acting as the application zone.

Abstract: In a method and apparatus for soldering or tinning wires or component leads, solder is pumped through a nozzle to form a downwardly flowing stream. The wire or lead is passed laterally into the stream and then withdrawn axially to leave a coating of solder on the wire. The wire or lead is angled to the horizontal, pointing upwardly in the direction of withdrawal from the stream.

Abstract: A liquid, foam or paste treatment medium is applied to a textile or similar web as the web is led through a gap in which the web is pressed resiliently against an opposing face in an area extending over the width of the web with non-uniform pressure by, for example, several adjacent cushions that are independently inflatable. The non-uniform pressure serves primarily to achieve uniform treatment, in particular, uniform coloring, despite the non-uniform conditions existing over the web width. The non-uniform pressure may also be used for imprinting patterns on the web.

Abstract: At the outflow-side end of a pre-dosing device, which comprises an applicator chamber formed at the product web in the region where the latter is guided by a counter-cylinder, a rolling doctor rod, wire wrapped or provided with circumferential grooves, is provided as a pre-dosing element, whereby high excess amounts of coating compound can be applied on the product web.

Abstract: An end dam for use in a coater head which applies a coating material under pressure from a reservoir onto a web is shown to include an attachment arrangement for attaching the end dam to the coater head a first wall which prevents the lateral movement of the coating material, thereby defining one end of the reservoir, a second wall, spaced from the first wall and laterally away from the reservoir, such that a channel is formed therebetween so that coating material passing over the first wall experiences a drop in pressure sufficient to maintain the coating material within the channel.

Abstract: An electroless copper plating process for producing fine patterned wiring boards is improved by supplying very fine oxygen-containing gas bubbles through a porous alkali-resistant resin gas dispersing tube. An electroless copper plating apparatus having such a gas dispersing tube is also provided.

Abstract: The disclosed charge transfer signal processor includes a vacuum housing having an input face and an output face, a 2-D electromagnetic input means cooperative with said input face for providing a 2-D input electronic charge signal within the vacuum housing, transfer means for imaging the 2-D input electronic charge signal in a region of the vacuum housing proximate the vacuum housing output face, and charge feedthrough means coupled to the vacuum housing output face for transferring the imaged 2-D electronic charge signal externally to the vacuum housing. In one embodiment, the charge transfer signal processor is operable as Gen-1 charge transfer amplifier. In another embodiment, a microchannel plate assembly is disposed in the vacuum housing intermediate the input and output faces, and the charge transfer signal processor is operable as a high-gain charge transfer signal amplifier.

Abstract: An apparatus for supplying liquid to an elongated liquid reservoir in a uniform manner over the length of reservoir comprises a trough, extending transversely over the width of a continuous fabric web, into which a liquid is poured from above, and a feed pipe extending longitudinally along the trough. Short, identically formed, curved tubes are uniformly distributed over the length of the feed pipe and arranged to extend transversely therefrom. The liquid is supplied over the length of the liquid reservoir from the short tubes disposed at a plurality of sites along the reservoir. The cross sectional area of the feed pipe may be significantly greater than the total cross sectional of all of the curved tubes to prevent a significant pressure drop.

Abstract: A method of simultaneously applying a plurality of liquid coating compositions to a moving web by the method of multi-layer coating; wherein the lowermost layer is comprised of water, with the wet coverage of water on the web being 2 cm.sup.3 or less per square meter (m.sup.2) of the web, and the layer immediately above the lowermost layer comprising a water-soluble coating solution having a viscosity greater than water and which is greater in thickness than the lowermost layer.

Abstract: A depilatory wax automatic dispenser on depilatory strips essentially comprising: a basement for a pot; an electrical resistance immerged in said pot; a cavity made in said basement near said resistance; a batcher cylinder closing said cavity; a device to positionate a strip at a preselected clearance from said cylinder; at least one outlet port in said cylinder to dispose wax on said strip slipping below said port; means for manoeuvering said cylinder from a first closing position to a second opening position for said port; elements for disposing said strip in a horizontal attitude when said cylinder is in said second position; electrical feeding control means for said resistance.

Abstract: An end seal for a blade coater is provided wherein an elastomeric seal is held in a case by a plurality of needle-like projections extending from the case. The case has at least one side adapted to seal against, and conform with, the surface of the coater blade and is magnetically attached to the blade. This permits quick, easy adjustment of the elastomeric material in the coater to change coating widths, or the rapid replacement of the worn elastomeric end seal.

Abstract: A coater for applying liquid coating material onto a paper web carried across an upstream dip roll applicator that applies an excess layer of coating onto the surface of the web, is cahracterized by an improved downstream doctor assembly for metering and leveling the coating of the web. The doctor assembly includes a doctor blade having a top extended agianst and across the web, and a shear plate just upstream of the blade. The shear plate has a surface facing toward but spaced from the web and a ramp on the surface extending toward the web. As the coating layer on the web contacts the doctor blade, excess coating removed from the web by the blade bounces back off of the blade, flows across the shear plate surface and is deflected by the ramp against the web to rewet the excess coating layer on the web before it reaches the blade.

Abstract: The wave barrier device of the invention comprises a flap which is rigidly joined to the soldering machine. This flap plunges lightly into the molten tin bath and pushes it before the board which is precedes.

Abstract: A short-dwell coater comprises of a backing roll (1) used for guiding a paper web (1), with an upper lip (28) and a lower lip (28) forming a nozzle apparatus. This nozzle apparatus can apply the coating mix on the paper web while the web is backed by the surface of the backing roll. A doctoring member with which the excess mix applied with the nozzle apparatus can be doctored is also provided as well as a mounting fixture, to which the doctoring member is mounted, and a support structure, with which the fixture is supported. In the short-dwell further comprises an actuator, to which the nozzle apparatus is attached so that the apparatus is movable in relation to the doctoring member in order to adjust the dwell length between the doctoring member and the nozzle apparatus.

Abstract: A coating deckle of a coating device including a holder for a soft rubber sealing element wherein the holder includes a sealing tongue aligned parallel to the restrictor plate which extends parallel to the opposite roll supporting the web in the area of the coating device. The sealing tongue bears flat on the restrictor plate and seals in the area of the restrictor plate and the application space which is formed between the restrictor plate of the web or opposite roll and the blade element. The restrictor plate includes a groove in which the sealing tongue is movably held.

Abstract: A method and an apparatus for applying molten wax to one face of a wafer is disclosed. A container having an upwardly facing opening contains the molten wax. The wafer is held substantially horizontally above the opening of the container, with one face of the wafer facing downwardly toward the opening of the container. At least one of the container and the wafer is moved toward the other to bring the opening of the container and underside of the wafer into contact with each other to thereby apply a predetermined amount of molten wax within the container to the underside of the wafer. Preferably, the container is filled with the molten wax such that the molten wax stands up, under surface tension, above a peripheral edge of the opening of the container. Preferably, the wafer is spinned around its central axis in a high speed so that the molten wax applied at the central portion thereof is spread on the entire surface of the wafer and that the extra wax is scattered out of the wafer.

Abstract: A piston driving device for dispensing a predetermined small amount of paste-like material from a nozzle in response to an electrical signal without any time-delay is enabled by the slow rotation of a ball-screw shaft, the rotation being reduced by a differential gear system. A female ball-nut fitted onto the ball-screw shaft causes a piston plunger to advance at very low speed such that dispensing of the predetermined volume of paste-like fluid is possible. Vertical motion of a nozzle is compensated by vertical motion of a piston driving device such that the relative position of a piston against a nozzle is unchanged.

Abstract: An apparatus for soldering printed circuit boards moving along a predetermined path of travel, comprises an upwardly extending nozzle member having an opening at its top end from which molten solder is caused to overflow to form an overflowing molten solder with which the underside surface of the printed circuit board is contacted, and an adjustable outlet member rotatably disposed in the opening to define an outlet extending in the direction transverse to the path of travel, so that by adjusting the angular position of the outlet member the orientation of the outlet may be varied for adjustment of the direction and height of the overflowing solder.

Abstract: Apparatus for intermittently applying a fluid coating substance such as a workpiece or a substrate on an object such as a workpiece or a substrate. The apparatus is provided with a storage chamber to which is provided the fluid coating substance under pressure. The storage chamber has an inner rigid side provided with an orifice nozzle through which the coating substance is discharged for application. The coating substance is discharged intermittently in discrete quantitites, of minute volume if desired. The discharge is effected under control of a rotatably driven discoidal rotor in the form of a ceramic discoid disposed interiorly of the storage chamber. The discoidal rotor is provided with a through opening in the form of a cross sectional passageway extending between opposite sides thereof. The discoidal rotor has one of its sides bearing on the side of the storage chamber and as it rotates the passageway therein is intermittently aligned with and in communication with the orifice of the storage chamber.

Abstract: A device for applying a viscous sealant (D) in annular form onto a substantially flat surface, specifically on to a can end (14) is provided with an approximately horizontal annular transfer surface (2a, 3a) provided at the free upper end of a material transfer head (1). A pass (4) opening towards the transfer surface (2a, 3a) is provided in the material transfer head (1) and is fed with sealant from a continuously operating pump device (P1). An open-top interior (8) surrounded by the transfer surface (2a, 3a) and provided in the material transfer head (1), which is connected to a backflow pipe (9) for excess sealant, is, in addition, permanently connected to a vacuum source (P2). Further, a transfer device (18) is provided by which the can end (14) is vertically movable in relation to the transfer surface (2a, 3a). (FIG. 1).

Abstract: A method and apparatus for coating a liquid coating composition to a moving web in which air entrained on the web is replaced by a gas having a higher solubility than air in the liquid coating composition. The moving web is exposed to the gas immediately before it arrives at a die through which the liquid coating composition is applied to the web. A vacuum system may be used to remove the air from the web prior to its exposure to the gas.

Abstract: Method and apparatus for applying coating liquid onto a moving base, such as paper or board web, the surface of a counter-roll or the like wherein the coating liquid is fed under pressure into a coating liquid chamber of a coating device defined by a coating member, a front wall, edge seals and by a region of the moving base to be coated. In order to seal the front wall of the coating device against the passage of air with respect to the moving base and/or to lubricate the front wall and moving base with respect to each other, a fluid material, such as a liquid, dispersion, solution or the like is fed to an inlet side of the moving base region forward of the base region and front member in the direction of movement of the base so that the fluid material moves substantially parallel to and in the same direction as the moving base.

Abstract: A coating deckle of a coating device including a holder for a soft rubber sealing element wherein the holder includes a sealing tongue aligned parallel to the restrictor plate which extends parallel to the opposite roll supporting the web in the area of the coating device. The sealing tongue bears flat on the restrictor plate and seals in the area of the restrictor plate and the application space which is formed between the restrictor plate of the web or opposite roll and the blade element.

Abstract: A device for coating a web of material that travels around a backing roller, with a coating chamber that opens toward the backing roller, and with a liquid-coating intake that has an overflow gap at the paper-intake end and is closed off by a metering unit at the paper-exit end. The coating device allows establishment of a wider range of coating densities (e.g. 4-20 g/m.sup.2) without great expenditure and without coating defects in the coating. The metering unit accordingly pivots independently of the coating chamber (3) around an axis that parallels that of the backing roller and is sealed off by a sealing structure (12) from the structure (6) that demarcates the coating chamber.