Sepac has said its operating speeds on two paper machines have increased by 20% after it invested in two Hergen-supplied Steel Yankee Dryers.
At the end of 2012 the Brazilian tissue producer replaced two existing cast iron Yankee dryers for its machine # 1 and # 2.
The two 10ft (3,048mm) nominal diameter dryers are manufactured in carbon steel and internally ribbed.
The machines changed from 1,000m/min to 1,200 m/min in the smallest basis weight.
According to Hergen, this improved the superiority of the drying capacity of the ribbed dryers in relation to conventional cast iron cylinders when working at the same steam pressure.
Due to the drying capacity increase, Hergen added that Sepac decided to turn off the steam showers previously installed at the suction presses of both machines and also eliminated the post dryers used in the production of high basis weight towel.
The new ribbed dryers resulted in a more stable and easy to control coating, which brought a much “more precise and uniform creping process that allowed producing higher quality papers with proven smoothness increase”.
Sepac was founded in 1974 and now produces over 75,000tpy of high quality paper.
