Co-extrusion AB and ABA Blown Film Machine - A Simple Comparison
Both AB and ABA co-extrusion blown film machines consist of 2 extruders, the main difference between the two is the design of the material flow channels in the die head.
What is AB co-extrusion machine?
The AB co-extrusion machines can produce film of two different colors or two different properties of material on each side, normally used for agricultural (mulch) film, courier bags and construction film. This two-layer machine typically uses two extruders of the same size for an equal material distribution to A and B layers.
( AB Co-extrusion blown film machine )
What is ABA co-extrusion machine?
The ABA machine on the other hand, produces a “3-layer” like structure using 2 extruders of two different sizes. The bigger extruder is used for the middle (B) layer which can produce up to 75% of the film composition, while the smaller extruder covers the surface of the finished film using lesser amount of material.
( ABA 3 Layer Co-extrusion )
It is a popular model for garbage and shopping bags as this model allows producers to reduce production cost by using a higher percentage of recycled materials and calcium carbonate in the middle (B) layer.
The comparison between AB/ABA
Compared to single-layered machines, both AB and ABA co-extrusion lines produce stronger film with higher tear resistance thanks to a multi-layered film structure.
AB and ABA can also be a more economical option for ABC co-extrusion machines for some applications, achieving the same results while saving on machine investment and electricity cost.
( AB/ABA co-extrusion )
( ABC co-extrusion )