Materials preparation | drying
eters on a 7-inch touch screen. The menu screen provides immediate access to all settings and other parameters needed for set-up and troubleshooting. Motan-Colortronic has developed the mobile dry-air
dryers Luxor E A and Luxor EM A for drying hygroscopic plastics for small material throughputs or stand-alone applications. Equipped with a permanently installed drying bin, the compact dryer provides the manufac- turer with 60, 100, or 150 litres of drying bin volume. The company adds that the Luxor E A models of the new range can be integrated into existing systems. They are designed to be connected to existing conveying systems. Alternatively, they can be equipped with their own stand-alone material loader. Luxor EM A dryers are self-sufficient, moveable
stand-alone units, for isolated application, for example. As standard, they are equipped with integrated dry-air drying and a side-channel blower, as well as a small, monitored cyclone blower protection filter. The cyclone filter consists of an easy-to-clean fine filter cartridge and a transparent dust collection bin. The pipe work for dry-air conveying with rigid hose connections ensures that the suction box is protected from environmental air and filled with dry air. This is why material can remain in the suction box even during downtimes, as it continues to be a dry environment, protecting the material from reabsorbing moisture. The Luxor EM A version dryers have up to three
Metro-G material loaders for operation, in order to supply the drying bin and up to two processing ma- chines. Optionally, Metro-G material loaders with an installed Metromix proportioning valve can be installed, so that regrind from production can be dried and immediately returned to the process. In order to adjust the amount of regrind, the proportioning valves are integrated into the controls. According to the company, the new dryers operate in
a closed process cycle in combination with tempera- ture-controlled regeneration. They can optionally be fitted with dew-point-controlled regeneration. The closed-cycle drying process has the benefit that the dryers continue to operate stably even at high environ- mental moisture content, although a low dew point may be required. Both dryer ranges are controlled and operated via the Luxornet EM controls, which are also new. They are operated via a colour touch-panel with self-explanatory illustrated guides. All functions for drying, conveying and the operation of the proportioning valves can be set easily. A weekly timer is also integrated. Operation is also claimed to be user friendly after a re-start. It only requires selection of the
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material to be dried and the system starting. Filling of the drying bin and the material specific pre-drying then occurs automatically. The unit will signal when production can be started. Along with the integrated database with the drying parameters of over 70 types of plastic, a second database is available for the customer with free slots for the parameters of up to 50 materials. Via an Ethernet interface the dryers can be integrated into existing networks. This means that all functions can also be operated from a superordinate system. The drying system’s data can also be collected centrally.
Automated system Piovan has widened the Genesys system, launched in 2009 for PET preform and bottle production only, and is now offered in a new range of systems for a much wider range of applications. Genesys is a single-hopper, individual or central, fully automatic drying system. The company says that it can adapt and automatically control operating parameters based on ambient temperature, initial moisture level, type and quantity of polymer, the final moisture content of the polymer, and granule size. In conventional applications a drying unit is com-
monly used to generate dry air, which is then circulated in drying hoppers. Different polymers require specific individual conditions for optimum operation (air flow, temperature and pressure) depending on the different process variables. A safety condition is systematically adopted and the drying system is sized based on the most critical processing parameters – maximum material consumption and temperature, with the highest airflow. However, this goes against any principle of energy efficiency and raises running costs, as these extreme conditions rarely occur. Instead, Genesys adjusts and controls optimal
operating settings for the material to be dried, using only the overall amount of energy strictly required. The settings are constantly compared with the data collected by the sensors installed on the system. A patented measuring unit, located in the air supply line, adjusts and controls the air flow instantaneously and
Below: The
new range of Genesys dryers from Piovan
March/April 2017 | INJECTION WORLD 45
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