Durathane Performance Study—
Hot Cast Polyurethane Rod Holders
CHALLENGE: The purpose of the trial was to run Buschman Durathane HS-Hot Cast Polyurethane Rod Holders on a Rod Metering Size Press. The customer used Light Weight Coating (LWC) on to fine papers. Customer was having a problem with excessive coating build up on the upper lip edge of the holder. Buschman custom engineered a new holder profile so as to rotate the axis of the cradle to pull the upper lip away from the backing roll. Success was achieved with surprising results.
RESULT: Buschman Durathane HS-Hot Cast Polyurethane Rod Holders achieved good performance for 6 weeks (50% increase in holder life), plus the lip edge stayed clean in operation allowing the coating to run for 6 weeks, uninterrupted by streaking that was common previously.
Key Application Parameters:
- Magazine & other specialty grades of paper from LWC, which is mostly white clay.
- Rod holder life is typically around 4 weeks.
- Purchase holders from the OEM.
- Holders used in both the top & bottom position
- Machine Speed 1310 Meters per minute
- Rod Load Pressure 20-35 PSI
- Rod speed is 75 RPM
- Backing roll hardness 45 P&J Polyurethane
- Percent of solids: 58-61 %
- Dry Coat Weight 13-15 g/m2
- Basis Weight:30-50 g/m2
