STACKED MULTI-LAYER CO-EXTRUSION DIE HEAD

摘要

Disclosed is a stacked multi-layer co-extrusion die head for film-blowing machine, which comprises (N+3) disks (2) stacked top-down and N horizontal flow passages (20), wherein N is an odd integer with N≥5. Each of the horizontal flow passages (20) is formed by splicing an upper demi-groove on the lower surface of the upper disk and a lower demi-groove on the upper surface of the lower disk after being aligned. From the top to down, the lower surface of the first disk is formed with the upper demi-groove, the lower and upper surfaces of the second disk to the (N-1)/2th disk are formed with demi-grooves, the upper surface of the (N+1)/2th disk is formed with the lower demi-groove, the lower surface of the (N+3)/2th disk is formed with the upper demi-groove, the upper surface of the (N+5)/2th disk is formed with the lower demi-groove, the lower surface of the (N+7)/2th disk is formed with the upper demi-groove, the lower and upper surfaces of the (N+9)/2th disk to the (N+2)th disk are formed with demi-grooves, and the upper surface of the (N+3)th disk is formed with the lower demi-groove. The present invention can prevent the material being overburnt or burned when producing multi-layer coextruded film composed of polar materials such as EVOH. At the same time, the overall height is small and the flow passage is short.