Blown film die for production of extruded single or multi-layer blown films has a inner ring divided into upper and lower parts, the lower part being of greater volume than the upper part

摘要

Melt emerges from a circular or almost circular melt gap(10) in the upper region of an inner ring(3) which is only half the height of an outer ring(5) forming the melt outlet gap. The remaining part of the gap is formed by a larger volume inner ring(4) below the upper inner ring.