![]() ![]() ![]() The film thickness on this application role is ultimately determined by the distance between the two rollers (doctor roller and application roller) and the speed and direction of these individual rollers.The distance between the doctor and application role is then set to create the NIP and to transplant the film thickness onto the application roller below.Initial doctor roller rotation speed can be set at a percentage of the conveyed speed and adjusted accordingly for coating of specific items.The metal metering roller then works in conjunction with the application roller in order to form a pocket of coating which is called the nip.The roller is covered with various materials and densities to facilitate a range of coating applications.The application roller carries the coating film which will then be transferred to the substrate.A conveyor belt moves the substrate under the application roller to enable the coating transfer.Let’s roll this process out specifically: Well, explained in more simple terms, the speed of the conveyor and application roller are set and synchronised based upon production requirements (what needs to be coated) Following this, the process of transferring a layer of coating from the roller requires multiple crucial components. The effectiveness of this roller coating is technically determined by the rheology of the fluid being used set against the two individual speeds of the rotation surfaces (generally known as the “doctor roller” and the “application roller”). Science tells us that there are numerous bonding requirements behind this to ensure that the amount of coating material which is supplanted onto the substrate is almost entirely independent to the properties of the fabric. The roller coating machine setup begins with the initial adjustment of the application roll to the desired height – this application roller is typically set at light compression with the substrate (a function of roller durometer and substrate texture). As famously uttered by Leonardo Da Vinci : ‘simplicity is the ultimate form of sophistication’. The principle behind this method is ancient – based upon the physics of transferring a layer of coating from the surface of the roller to that of the substrate. ![]() It’s so effective because it’s expert method of design is both precise in application and also safe for the environment – offering near 100% transfer efficiency. Exhaust opening 8" diameter.Roller coating is considered to be an ideal method of applying thin coats of finishing material to flat substrates of wood, metal and plastic. Hood with adjustable sliding (such as Lexan) on infeed and offbearing side of coater. Conveyors driven from coating rolls by timing belt drive. Each coating roll and doctor roll is independently driven by a drive shaft. Hinged top half of machine opens for easy access to change coating and doctor rollsĪnti-friction, self-aligning roll bearings and slides inverted for optimum protection from adhesiveĢ drive motors 1 motor and gearbox arrangement to drive coating rolls and another to drive doctor rolls. Mechanical digital indicators, reading in thousandths, for visual reference of roll position Upper coating roll: single handwheel for vertical adjustment Doctor rolls: unifeed adjustmentĭoctor rolls: Smooth ground chrome-plated steel Seal plates equipped with drains for recirculation of adhesive Supply of coating material for upper and lower coating assemblies is held in the trough formed by the doctor roll and coating roll and UHMW seal plates which seal the ends of the rolls. Union roll coaters are available in sizes ranging from 6" to 110". We have combined our years of experience with today's materials and technology in order to offer a roll coater which we feel is superior to any other on the market. ![]() The Union Tool Corporation has been manufacturing roll coaters for many years. The facing plates may range in size from 3" to 22" in diameter and in thickness from 0.030" to 4.000". This coater applies a smooth, even, controlled amount of adhesive with a direct action roll coater. The Union Adhesive roll Coater was designed to apply water-based, solvent-based or phenolic resin adhesive to the top and/or bottom surface of clutch and brake facing plates in a single pass. Depending on your industry, you may call this a roller coater, a roll coater, an adhesive spreader, an adhesive roll coater, a glue coater, a glue spreader, a two-sided adhesive coater, a two-sided roll coater, or a double-sided roller coater. ![]()
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