Stripper roll

Fig. 9. Extrusion coating A, unwinding of substrate B, pressure roll C, chill roll D, die E, stripper roll F...

Since the heated plastic clings to the calender rolls the web does not drop off the last roll. It has to be pulled off evenly across the width of the roll. This is accomplished by the stripper roll which is normally positioned 3 to 6 in. (75 to 150 mm) from the last roll, and at a height that gives the sheet approximately 270° lap round the roll. 

The thinner the sheet the greater the degree of roll cling, Thus the speed of the stripper roll must be varied with respect to the calender speed. Once the desired speed differential is set it is maintained. As the calender speed is altered, the stripper roll speed maintains a constant ratio with the calender speed. 

Roller card Generally, any type of card in which rollers do the carding. Usually this refers to a woolen card with a main cylinder and four to seven stripper rolls and worker rolls working in pairs. 

Cold Stripper-New. [Wax Industries] Emulsifier/solvent blend stripper for removing phomsensitive lacquer from copper rolls and screens. 

In some machines, stripper rings double as pinch rolls to drive the material through the arbors. 

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