THREE LAYER BLOWN FILM COEXTRUSION LINE
FOR THE PRODUCTION OF QUALITY TECHNICAL FILMS FOR FOOD PACKAGING AND GENERAL APPLICATIONS

Main features of the line

• The 3 extruders are on parallel lay-out on common frame (or upon request on radial lay-out); 2 of them are 65 mm. and the midlayer is 75 mm. screw diameter. All are with a.c. vector motors, bimetallic barrel, ceramic lined heater bands, low-shear barrier screws.

• The coex head is the well reputed Multisplit type (direct seeding and binary repartition), featuring a very minimum melt resident time, a low-working pressure and a quite high self-clearing factor.

• The IBC construction is vertical passing through the head, thus granting an absolute temperature homogeneity of the steel mass, to the benefit of the thickness distribution.

• The dual lip cooling ring is coupled with an automatic film profile control system (a segmented flow design), that, thru 48 actuators, a circular scanner with capacity type head and a powerful software grants gauge variations below the threshold of ± 4%.

• The oscillating nip is a 360° horizontal – diverging type, with air cushion rollers and option for additional nip-roll on the film descent section, before the photocell edge guide.

• The 2 station automatic flat-ped winder is the latest development in the “Dolci” winders family and, for this line, can be assembled in face-to-face or back-to-back lay-out and includes the following outstanding features: GAP winding with taper tension control and reverse winding. The reverse winding
is particularly welcome in case of sticky films on one side, and for turning the corona treated side on recto or verso, according to job needs.