BURNER PRODUCING A HOT GAS FLOW, ESPECIALLY FOR SHRINKING PLASTICS SHEETS

摘要

A burner for generating hot gases to be used for packaging purposes with thermal shrinkage of plastic foils has an elongate rectangular zone of transition between its pressure-distribution and combustion chambers, spanned by a flame-retaining tube forming narrow passages for the gas flow with the adjacent walls. A number of codirectionally curved sheet-metal baffles equispaced, and of equal radius of curvature, mounted on the downstream side of the tube and extending toward the opposite walls of the chamber, improve the combustion conditions of the gas mixture and lead to a higher velocity of the stream of hot gases leaving the burner, thus increasing the amount of ambient air entrained into the stream and thereby reducing the temperature of the combustion gases.