Recently, the Italian company Bundra showed to the public its co-extrusion equipment for the production of high-performance multi-layer barrier films. The processed film has good flexibility.
The co-extrusion equipment consists of 5 extruders, 2 TR75AfS extruders for the outer layer, 2 TR35 extruders for the adhesive layer and 1 TB65AFS extruder for the barrier layer. The TR75AFS screw design is suitable for general-purpose resins such as LDPE, LLDPE, HDPE, metallocene polymers and ionomers. The thickness of the barrier material (E/VOH or nylon) can be controlled between 0.02 and 0.03 mm, and the maximum width of the produced film is 1600 mm. The equipment uses a multi-component mass feeder and precisely controls the feeding amount of each extruder. The advanced monitoring system ensures the optimal combination of various raw material feeding amounts. The thickness of each layer is monitored and the extruder is also assembled. Central temperature control system. The company also relies on melt flow analysis and simulation software to design the head, so the material residence time is short, the head pressure is small, the cost is saved, and the film thickness accuracy can reach 0.003mm. (Italian Association)