Aug 18, 2015
By converting double-felted cylinders in the fourth and fifth dryer groups to single-felted cylinders, Lee & Man Dongguan Hongmei mill was able to improve the runnability and shorten the threading time of its PM 15.
“We have been paying much attention to energy consumption ever since the project kick-off meeting. As a result, the fan power of supply air after the web stabilizer SR blow box upgrade has decreased by about 30%, while the vacuum level has improved. This has all been made possible thanks to Valmet’s technology,” explains Chen Liming, Senior Manager of the Project Department at Lee & Man.
Read the whole article: Lee & Man PM 15 after a dryer section rebuild: Better runnability and faster tail threading
1 earlier known as VacRolls
2 earlier known as SymRun blow box
3 earlier known as SingleForce Plus
4 earlier known as LiteCompact
|Customer challenge||PM 15 suffered from poor machine runnability and a high number of production breaks.|
|Solution||Valmet upgraded the cylinders to Valmet Dryer Vac Rolls1 by drilling and grooving them on site. The rebuild also included new Valmet Web Stabilizer SR2 blow boxes and pocket ventilators. The tail threading was also improved with Valmet Tail Threading Single Fabric B3 and doctoring by installing Valmet Doctor Holder Compact4 blade holder in the first, second and third dryer groups.|
|Results||After a ten-day shutdown, the machine was able to produce 70–90 g/m2 fluting in the very first month after the rebuild with nearly 3% better efficiency than previously.|
|Keywords||Board and paper, China, Improvements, Rebuilds|