Paper Technology Journal 17 - Voith

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20 1 Volker Schölzke Finishing volker.schoelzke@voith.com 17/04 China’s first Twister – automated paper roll wrapping par excellence For the new PM 10 at Huatai Paper, an additional requirement by the customer was state-of-the-art roll wrapping. The new wrapping line had to meet the following demands: ● Capacity: more than 120 rolls per hour. ● Roll width range: 600 mm to 2,200 mm. ● Grade and format changes: on a recurring basis. In view of the high capacity and fairly consistent roll parameters, with unchanging widths for lengthy time periods, we decided to replace the travelling paper dispenser normally used for spiral winding on the Twister with a compact stationary dispenser (Fig. 1). 2
This dispenser comprises a feeding system with integrated gluer/cutter and four wrapping paper rolls. It enables roll wrapping in a single operation including end fold-over and gluing. Only with respect to the stationary dispenser, the Huatai PM 10 roll wrapping machine layout differs from the automated Twister 2-Line installations at e.g. Steinbeis-Temming and SCA Laakirchen, and soon at Leipa. This is clearly shown in the 3-D layout in Figs. 2 and 3. At Huatai the automated handling system components are identical to the robots so far used in all Twisters for handling the inner and outer header disks and labels. Two robots in the Huatai wrapping line Finishing take inner disks from their respective stacks. Then one robot places the disk on the left face of the roll and the other on the right face. Despite the fast operating cycle, this always ensures enough time for cleanly lifting the header disks off the stacks (Fig. 4). The double gripper of the robots for the outer header disks has a special adjusting mechanism to fit the different diameters and reliably separate the disks, which are usually serrated. An additional advantage of this gripper design is that even the largest disks are supported over their entire surface area on the header press, thus making bent edges a thing of the past (Fig. 5). 3 Fig. 1: Wrapping paper dispenser. Fig. 2: 3-D layout graphic of Huatai. Fig. 3: 3-D layout graphic of Twister 2-Line. Fig. 4: Inner header disk robot. Fig. 5: Outer header disk robot. 21 These 6-axis industrial robots are mounted on a traverse, which gives them seven axes of motion. As a result, the disk stack can be lined up in front of the robots instead of around them in a semicircle. Not only does this look better; but above all it greatly simplifies the delivery of new disk stacks. The robots operate as completely autonomous units, thus guaranteeing high reliability of the roll wrapping line. They fit the header disks and labels with the greatest precision – roll by roll – to ensure perfect wrapping. Another interesting feature of these Voith wrapping machines is the cross-line roll 17/04 4 5
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Dresden Papier, Heidenau, Germany.
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Bahia Sul Celulose, Bahia, Brazil.
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Paper Technology Journal 17 - Voith

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