Blind drilled, grooved, and suction drilled rolls are commonly used on presses in the papermaking process. The open areas in these rolls are designed to accept water from the fabric. It is important all the water in these rolls be evacuated before the nip to prevent re-wetting the sheet and to ensure optimum press nip performance. In some cases these rolls rely solely on centrifugal force to evacuate water, but this is often not sufficient, especially when the fabric becomes filled and cannot accept as much water.
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Written by Jerry Vandoros
on April 08, 2014.
Last week tissue makers and converters from around the world visited Tissue World Americas in Miami, Florida. Tissue World Americas reported the event brought in a record-breaking number of participants. The exhibition and conference offered a variety of opportunities for learning.
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Written by Vicki Hunsberger
on March 25, 2014.
Unfortunately, this happens too often. Repairing or replacing steam coils can be very expensive. Fresh air make-up steam coils are typically temperature controlled using a modulating steam control valve to regulate the discharge air temperature.
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Written by Mike Sneary
on March 03, 2014.
A U.S. OEM designing and manufacturing semiconductor machinery required a two-passage rotary union that had to fit into a 3” (76 mm) space on one of its new machines.
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Written by Frank Marsden
on February 19, 2014.
Rotary unions used with heat transfer oils require special attention during repair to ensure leak-free operation. Heat transfer oils tend to “coke” at high temperatures and deposit material that can settle in the rotary union and adhere to the sealing components.
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Written by Al Ives
on February 03, 2014.
