The process of producing plastic film by extruding molten resin into continuous tube is extremely simple. The elements of the process include plastic pellets (resin) which feed through the hopper into an opening on the back of an extruder. Here, heat and friction from the screw and barrel inside of the extruder convert the pellets to a melt which are forced through an annular, or ring-shaped, die to form a tube.

The tube is inflated to increase its diameter and decrease the film gauge, and at the same time is drawn away from the die, also to decrease its gauge. The bubble is flattened by collapsing frames, drawn through nip rolls, over idler rolls to a winder which produces the finished rolls of film.

The system is, in fact, one of the most complex and sensitive of all plastics processing technologies and it presents many inherent difficulties. It would be fair to say that few who fully understands those difficulties would ever enter the business except for the fact that there is a positive side to the picture. The tubular blown film process is efficient and economical, and can produce array of products from a light gauge, clear converter film to heavy gauge construction film, which when slit open may be 40 feet or more wide.

Conclusion is that you must maintain uniform roll diameters, weights and appearance that will indicate a consistency of product that can only enhance the film to the customer. Finally a proper roll and or package label will identify your good work so the customer can recognize it.