A brown and kraft paper facility was having difficulty controlling the cross-direction (CD) caliper variation of their sheet coming out of the calender stack, leading to issues with printability, machine uptime issues due to line breaks and winding difficulties, and excessive scrap. The facility reached out to their trusted advisor at Precision Roll Grinders.

Since a poor roll profile negatvely impacts CD caliper control, calender rolls precision ground to tight tolerances were installed in the paper machine. The grinding service by Precision Roll Grinders improved roll rofile, journal concentricity to roll face, and roundness, all with no deviations larger than 0.0002 inches.

Upon installation of the PRG-ground rolls in the calender, the cross-direction caliper variation immediately dropped by over 37% to an average variation of 0.0005 inches! This reduced variation ensured improvement in operation and left the door open for future fiber savings through process adjustment. Typical industry values, would total annual cost savings of $150,000.

What PRG Can Do for You:

In addition to providing roll grinds to tolerances of 0.00004 inches, PRG offers roll rebuilds, leak testing, journal repair, hot and 3D grinding, and dynamic balancing, among other services. Connect with your representative now to actualize the benefits Precision Roll Grinders will bring to your machine!