When the blown film tube can be converted to plastic sheets by cutting one edge with a stationery knife. Common blown film extruded products are trash bags and drop cloths. Plastic film drop cloths are typical of a large blown film extrusion. Once you open the drop cloth and begin to spread it out, it will unfold several times before the single layer sheet is exposed. A large blown film extrusion die is picture in Figure 5-47.
Most commercial film is produced with the blown film process.
An extruder with a wire coating die is illustrated in Figure 5-48. A wire coating die is used to deposit plastic on wire or safety cables. The wire coating die extrudes plastic evenly over the surface as wire is continuously fed through the die. The plastic provide both electrical insulation and a non corrosive surface. Wire is coated by either a high pressure die or wire coating die.