Addex Inc. has developed an enhanced automatic external gauge control (EGC) system for blown film extrusion lines, called the Tandem.
The Tandem EGC combines the gauge control efficiency of the company's EGC air ring with a bubble-stabilizing lower air ring that achieves 15-30 percent greater output.
The lower, single-lip air ring sits on the die and matches the die's diameter. It is fed by a blower that is about half the size of the blower needed for a typical air ring, according to Addex. The blower gently cools the bubble, stabilizing it before it goes through the upper, dual-lip automatic gauge control air rind located above it.
The more-stable bubble can be run at higher output without jeopardizing the gauge control function, the company said.
The upper EGC air ring is 2 inches bigger than the die size. That larger diameter for the upper ring, which is equipped with the gauge control, is needed to accommodate for the blow-up ratio.
Addex is based in Stoughton, Mass
Tel. 781-344-5800, email [email protected]