The advantages of efficient waste handling systems cannot be ignored: labour costs for clearing and preparing trim can be kept to a minimum. Automatic collections at source frees valuable production space, minimises potential safety and fire hazards and allows machines to operate to their maximum capacity.
The waste is a nuisance in the production area becoming costly, time-consuming, and a danger. Delta NEU develops the Chopper Fan system. It provides the suction for automatic collection at source. The waste is then drawn through the Chopper Fan and reduced to small pieces before it is conveyed to the separator.
Fully automated sequenced systems result in substantial energy savings, operating only when required and recycling warm, filtered conveying air back into a building for space heating. A complete solution.
In the scrap extraction system, a Chopper fan® provides the airflow through a ducting network to move the scrap waste from the pick-up points described above to the centralised collection where the loose material is compressed either in a waste compactor or into bales, either way for cost effective transportation to the recycling process. The ducting network is carefully designed to balance the airflow between the numerous collection points maintaining air speeds in a tightly controlled range to ensure effective waste extraction at every point.
The waste extraction may be from several sources; directly from a belt conveyor or direct machine feed, a shredder or a floor sweep-up point. How the system is designed depends upon the factory layout, type and use of machines and processes and the amount of waste board generated.
In the collection area, the waste is separated from the conveying air in an AMSP separator through a perforated screen. The waste material then discharges from the base into the collector arrangement and, on a basic system, the air is drawn from the clean side of the screen using a balance fan and discharged. The balance fan ensures the material feeding into the balers does so without pressure which would blow waste and dust into the surrounding area. On larger installations, where there are multiple chopper fan systems feeding the separator, a rotary valve is a more appropriate pressure control method, ensuring the collection is not pressurised. This approach is often used too when there is the addition of a dust filter on the air exhausting from the separator, either to the atmosphere or recycled into the factory, minimising heat loss. The Jetline filter has been used successfully for many years in this application.
