Polyurethane Rod Holders Case Study

How Buschman Hot Cast Polyurethane Rod Holders Achieve Superior Performance

CHALLENGE:

The purpose of the trial was to run Buschman HS-Hot Cast Polyurethane Rod Holders on a Rod Metering Size Press. The customer used Light Weight Coating (LWC) on to fine papers. The customer was having a problem with excessive coating buildup on the upper lip edge of the holder.

Buschman custom-engineered holder profile to rotate the axis of the cradle to pull the upper lip away from the backing roll. Success was achieved with surprising results.

KEY APPLICATION PARAMETERS:

1. Magazine and other specialty grades of paper from LWC, which is mostly white clay
2. Rod holder life is typically around 4 weeks
3. Purchase holders from the OEM
4. Holders used in both the top & bottom position
5. Machine Speed 1310 Meters per minute
6. Rod Load Pressure 20-35 PSI
7. Rod speed is 75 RPM
8. Backing roll hardness 45 P&J Polyurethane
9. Percent of solids: 58-61%
10. Dry Coat Weight 13-15 g/m2
11. Basis Weight:30-50 g/m2

RESULT:

Buschman Hot Cast Polyurethane Rod Holders achieved good performance for 6 weeks (a 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.