![]() If a factory is tight on space you could consider a shorter reflow oven by processing your boards multiple lanes (dual lane or more) and slowing your belt speed, this would allow a shorter reflow oven to produce more boards. With Reflow oven sizes of 75”, 100”, 125” or 150” heated length the best choice would be at 125” inch reflow oven. ![]() So with the required belt speed of 26 IPM and the process time of 4 minutes the required inches of heat would be 104”. If the board size is 10 inches long, single lane, with 3 inch spacing and the factory requires 120 per hour (or 2 per minute) the required belt speed would be 26 inches per minute (IPM). ![]() Given the specification above the reflow process would require 104 seconds for ramp, 60 seconds to soak, 16 seconds to ramp to peak, and 60 seconds time above liquidus – this results in 240 seconds in the heated section of the reflow oven (4 minutes). Ramps = 2.5☌/second max for heating, -1.5☌/second for cooling.Soak (activation) = 150 to 200☌ for 0-60 seconds.TAL/Time above liquidus (221) = 30 to 60 seconds.The solder reflow oven belt speed is limited by the process specification which dictates ramp rates, and time above liquidus values. The boards per minute can be doubled, tripled or even quadrupled for multi-lane systems (boards processed side by side). #Oven reflow plus#The number of boards produced per minute in a conveyor belt oven is based on the belt speed, and then length of the board plus the between board spacing. ![]() Reflow ovens are sized primarily based on the required throughput. Is it a very high volume production environment with very little change in board type or size? Or is it a very low volume production environment, with periods of low or no production, and products that vary greatly in size and weight? Are the boards particularly difficult thermally? Do they have very big components and smaller ones? How tight is the thermal process window (the difference between the minimum process temperature and the maximum allowed process temperature)? What is the required throughput of the line? Conveyor Belt Oven Sizing The type of production environment is an important factor, meaning the product mix and volume. There are many factors to consider when choosing a reflow oven. ![]()
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