Pope reel

During reeling the paper quality cannot be improved any more. This why over several decades the simple pope reel (Fig. 6.75) was used with nearly no modifications. This type of reel only applies a line force system in the primary and the secondary arm and has no center drive. The primary arm handles the spool at the beginning of the winding process and turns the spool around the center of the reel drum. The secondary arm guides the spool on the horizontal rail. The line force system in the arms has to produce the nip load and has to compensate for the growth of the roll. 

The continuous process of paper production is interrupted at the reel, when the required roll diameter or web length has been reached. Now the paper web has to be cut, a fresh reel spool started and the finished parent roll discharged. So first the empty reel spool has to be accelerated to machine speed. With a standard Pope reel, the empty reel spool will now be lowered, till the nip is closed (Fig. 6.75). The reel is now ready for the turn-up which will be described separately. 

After the parent roll is in its end position, the primary arm can be lowered to the turn-up position and the primary nip is dosed. The turn-up position of the primary arm can now be varied between the position of a standard Pope reel and the position on the rails, depending on the demand of the turn-up system and the paper grade. The turn-up is easier and faster with self-threading concepts when the empty spool is already partly wrapped by the web. 

The objective of the process on the paper machine is to produce a continuous paper web of the required quality, uniform in machine (MD) and cross machine (CD) directions. The process equipment consists of the approach flow system, the headbox and the wire section, the press section, the dryer section, often a size press, sometimes a coating station, a calender and a pope reeler. After the web has been reeled up this full width mother reel is cut into smaller rolls with widths and diameters according to the customers requirements. The rolls are then wrapped and made ready for shipment... 

Final cartonboard post-calendering is mainly done with soft-nip calenders. The Pope reeler can be used for reeling up to 3.5 m diameter, reelers with center torque are applied for diameters of up to 4 m. A state-of-the-art board machine (Fig. 6.83) with on-Hne coating and final calendering has a length of up to 350 m. 

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