Temperature control systems for the decorators used on two-piece beverage can lines have been developed by Roeslein & Associates to cover the inkers, gearbox and overvarnish tank.
Precise temperature control is achieved through the application of the latest technology in integrated pump and valve controls, says Roeslein.
The system comprises ten individually-controlled temperature zones. It features a modular design with all components contained in Rittal enclosures.
The use of decentralised control means that no programmable logic controllers are required. Each valve features an integral controller. IFM temperature sensors and flowmeters with local readout are fitted, while the main pump has an integrated variable frequency drive and pressure transducer for constant pressure supply.
A key advantage of the system is said to be that it provides consistent inker and gearbox temperature control even with varying decorator speeds. Other benefits are that heating is provided when the decorator is idling to avoid over-cooling; and the system has the capability to cover a wider range of inker temperatures than with most single-zone systems.
Multi-zone temperature control also offers other advantages. These include: flexibility of individual inker temperature control for different ink characteristics; the capability to provide a level of predictive maintenance by monitoring trends with valve position and temperature at each inker; and improved control of ink viscosity, ink misting, colour variation and film weight.
More information from Roeslein & Associates Inc, 9200 Watson Road, St Louis, Missouri 63126, USA.
Tel: 1 314 729 0055.