Idler roll

Fig. 7. Extmsion of roll-cast film A, die inlet B, cast-film die C, air gap with molten web D, casting roll E, stripping roll F, idler roll G, edge-trim slitter ...

The mechanical design of the idler rolls is a function of the particular service under which the conveyor operates. Minimum industrial standards for roll dimensions, bearings, and application criteria for different service conditions have often been established. Idler life is determined by a combination of factors such as bearings, seals, shell thickness, load density, and operating environment. 

The tubular film continued upwards where it encountered a second collapsing frame that directed the bubble through nip rolls. The collapsed bubble was flattened and passed idler rolls and finally wound up on a collection core. 

Draw die, squeeze roll, breakdown roll, idler roll, guide roll, and so on Bending die, pressure die, mandrel, expand punch, swaging die, shear blade, feed guide, and so on... 

It is important that metal or metallized surfaces be in contact with a clean and grounded idler roll along its path through the corona treater. This idler roll can be covered with conductive ceramic to prevent oxidation and provide a ground path from the conductive material surface. 

As more atmospheric plasma systems become adapted to in-line processes, unique process requirements lead to very specific system designs. In addition, the dimensions and bulk properties of web materials determine key production line requirements, such as web tension and guiding (idler) rolls, to create effective entry-to and exit-from the plasma reactor. The reactor must also be sized, or scaled, in power density and treatment width to meet existing process efficiencies. 

---