Importance

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Abstract

A compact web dryer oven, (A,A') is disclosed which is heat efficient, may be open for convenient cleaning, and raises automatically under the effects of an explosion to relieve pressure and reduce damage to the oven interior. The oven includes a lower housing (B) and an upper housing (C) which are essentially identical. Each housing includes an air distribution system having a short path and recycle time which may include a hot air discharge blower (H,110,112,114), and an air distributing plenum (I, 116). Lower and upper hot air registers (E,F) receive the proportioned air flow. The air registers include spaced tubular members (22) transverse to the air diffuser manifold having an air divider nozzle (G) positioned between each member. A first nozzle (32), second nozzle (34), and third nozzle (42) are defined relative to tubular members (22) and nozzle bodies (G) which accelerate the flow of air in a manner to balance the air currents at the web. Air returns through slots (50,50') to air return chamber (130) in a closed loop so each hot air register can operate at a different temperature to treat dissimilar sides of a web. Isolated air return chambers (154a,156a,158a) define a series of drying sections (154,156,158) in each housing. Intake and exhaust ports (171,177) establish a slightly higher negative pressure in the hot air register of each section to facilitate web travel.

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First Claim