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SCA has developed a new tandem dosing unit that allows adhesives, sealings and insulation materials to be applied continuously. The dosing unit is suitable above all for automated endless applications in the paintshop that require a continuous material flow.Avoiding downtime and reducing costs: these are the two main arguments that the company SCA puts forward for using its new electrically powered tandem dosing unit. With this unit, high amounts of adhesives, sealings and insulation materials can be applied to vehicle bodies via robot constantly and virtually “endlessly” in the paintshop.The unit consists of two single piston dosing units which are interconnected with each other. While one dosing unit, usually with PVC-based material, is filled, the other dosing unit conveys the material to the application nozzle on the robot hand. An intelligent changeover logic ensures that the material is applied in a constant flow without interruption during routine refilling. The quantity and pressure can be controlled exactly throughout the whole process. The flow rate is between 1.5 and 25 cm3 per second, and the maximum pressure is 250 bar. The material is then applied by the application nozzle, for example in a flat jet process, with adhesive beading or with thin jet nozzles. The tandem dosing unit consists of two identical piston dosing units. Automatic spindle lubrication and durable sealings for the material chambers ensure that the whole unit is very maintenance-friendly. What is more, it improves safety at the workplace: any possible contact of the maintenance personnel with toxic substances such as softeners is avoided. According to SCA, many companies have stopped using harmful softeners as production media. Nevertheless, the usual softener tanks are still available to allow users to visually inspect the durability of the seals. Depending on customer requirements, softeners can, of course, still be put into the tanks.
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