Pusher Tunnel Furnaces

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Harper’s Pusher plate and Tunnel kilns are designed for processes requiring precise control of temperature and atmosphere, ideal for those with longer residence times that require exact control of the heat up rate of the product (temperature profile) and lower gas/solid reaction. Our focus is on systems that offer the greatest operating life, lowest operating cost, and highest efficiency for the manufacturing of advanced materials, from temperature ranges from 500-2800°C.

Harper's innovative design enhancements consider the delicate pressure control within the system to provide accurate direction of the atmosphere flow path in the kiln. This facilitates evacuation of volatiles and optimizes atmosphere uniformity. Additionally, Harper’s unique gas curtain technology provides zone-to-zone atmosphere definition under specific conditions. Our distinctive stripping chamber design provides optimal isolation of internal tunnel chamber environment from ambient as well as efficient purging of ambient atmosphere entrained within the load entering the furnace without the use of mechanical doors and seals.

Our highest temperature advanced graphite Pushers incorporate strategic heating element placement to achieve optimal temperature uniformity and advanced insulation designs to reduce energy consumption. Precise control of atmosphere dew point along the length of the furnace is achieved through sophisticated gas distribution technology.

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