Avoid Those Devilish 'Angel Hairs'

摘要

Excessive conveying velocity - the speed of air moving through the pipe or tube - can make matters worse, causing angel hairs to form not only at the elbow but even in straight runs of conveying tubing. The ideal average velocity when conveying PE or PP is in the range of 4000 ft/min. In a vacuum conveying system the velocity increases as the air expands and moves towards the vacuum source. The result of this air expansion is a terminal velocity that can be around 5000 to 6000 ft/min. That's 65 mph.