Frequently Asked Questions

It depends... on what kind of pulp is being assessed (MOW-mixed office waste, ONP-old newsprint, OMG-old magazines, OCC-old corrugating containers, BC-bottle carrier, Ledger, Broke), and the screen plate size (.004"/100microns, .006"/150 microns). However the Pulmac MasterScreen can screen between 2 and 100 grams.

Again it depends on sample size and screen plate size but it will take anywhere from 5 to 15 minutes.

The Master Screen Cycle 1 is designed to measure a small amount of virgin pulp to determine shive or debris content by weight. While the Master Screen Cycle 2 can screen larger amounts of recycled pulps for contaminants, Cycle 3 will screen even greater amounts while limiting fiber buildup in the slots of the screen plate.

Although size requirement is somewhat dependent on customer preference, type of pulp, and from how far back in the process representative samples are drawn, the following "rules of thumb" apply.

1. 0.003 in./75 microns = low freeness PGW and bleached hardwood
2. 0.004 in./100 microns = mechanical pulps, some chemical hardwoods
3. 0.006 in./150 microns = Bleached and unbleached softwoods, ONP, NSSC, and some MDF
4. 0.008 in./200 microns = OCC, some MDF, high yield kraft

Screening of 2-20 grams takes 5 to 8 minutes. Total test time, including sample preparation, screening and analysis can take a little as 20 minutes but rarely more than 30 minutes. Screening of 100 grams of MOW, ONP, and OMG takes 8 to 12 minutes. Total test time, including sample preparation, screening, and analysis takes from 20 to 30 minutes. Screening of 25 grams of OCC takes 8 to 12 minutes. Total test time, including sample preparation, screening, and analysis takes from 20 to 30 minutes.

The Pulmac Lab Master Screen can run tests every 15 to 30 minutes 24 hours a day, 7 days a week. So up to 50 tests per day is possible in any combination of process location and frequency.

The Pulmac Lab Master Screen can effectively monitor stickies levels and is used by two major US suppliers of stickies dispersal chemicals.

The Pulmac Lab Master Screen can effectively qualify production output into pulp categories based on measured contaminant levels.

The Pulmac Lab Master Screen provides a low-cost, fail-safe system to ensure all possible contaminant detection contingincies can be addressed.

Seeing is believing. Where numbers alone can be misleading, there is nothing like holding the thing in your hand to give real meaning to what the numbers are telling you.

Not that we recommend it, but some of our machines have been chugging away reliably in mill sites for over two decades without ever seeing a Pulmac technician.

Are the numbers enough? After all, seeing is believing.