Both Metrols and abrasion resistant rubber sleeved bowed rolls are used in this application. Air purge is recommended in hot applications within the dryer area.

Setting the Bow
Setting the plane of the bow properly is the key to optimum spreading of the web / sheet for quality and productivity.

Fixed Bow Roll The Mount Hope fixed bow roll has an axle that is curved to a predetermined bow based upon the type of application, weight and type of material to be handled.

Vari-Bow Roll
The Mount Hope Vari-Bow has a patented split axle design that allows the paper machine operator to change the amount of bow to react to unpredictable spreading requirements and variable conditions encountered when running different weights, grades or types of material.

Mount Hope Vari-Bow and Multi-Bow rolls along with the fixed bow roll are applied directly to the wet sheet after the press section to gain a small amount of sheet width needed at the dry end and to eliminate any wrinkles in the sheet when it enters the dryer section.

Air Purge is recommended for all wet end applications.

HTA Rolls (High Temperature Application) The High Temperature Application (HTAT) bowed roll from Mount Hope maintains a smooth sheet and extends roll service life in high-temperature environments. Designed by Mount Hope engineers with a liquid cooled axle, the bearing races are kept below the grease temperature limit assuring maximum roll life.

Guardian
Guardian is a simple, low-cost system that protects against down time caused by bowed roll failure. Strategically mounted accelerometers, thermal sensors and tachometer monitor and record vibrations, temperatures and speed.

The continuous data is digitally displayed for operator action, and stored in a self-contained enclosure for use as a guide for predictive maintenance.

Roll Design Options
Sleeves
Specially formulated elastomeric sleeves provide the dynamic properties and durability for long performance life. Exceptionally abrasion resistant covers such as XL-2000 deliver exponential wearability and long-term economy in extremely high abrasion applications.

Metrol
Mount Hope Metrol metal rolls deliver exceptional durability and are available with chrome, no-stick and tungsten carbide grip coatings.

PTFE Sleeve
Mount Hope offers an optional PTFE outer shrink fit tube for maximum release. The PTFE sleeve fits over the bowed roll rubber cover and provides release properties unattainable with conventional roll cover materials.

Grooving
To ensure sheet-to-roll contact at higher speeds Mount Hope offers a variety of grooving configurations. Standard circumferential grooves, chevron pattern or spiral grooving eliminates air boundaries that can create sheet flotation.

Air Purge
Air Purge systems supply an air pressure of 12 inches water column (1/2 psi) to the inside of the bowed roll to prevent the roll from "breathing" when the roll goes from operating temperature to room temperature thereby drawing contaminants through the end seals.

Sheaves
Mount Hope bowed rolls are available with single or multiple "V" belt drives, timing belts, free wheeling rope and fixed rope sheaves, as well as special sheaves to meet specific needs.

Mounting Brackets
On bowed rolls 7 1/8" and smaller, model "D" pillow block mounting brackets are standard. Bowed rolls 10 1/2" and larger as well as all VARI-BOW rolls are supplied with RE rotatable brackets, which are also available on smaller rolls. Special modified brackets, including remote control bow rotation systems, are available to meet specific customer needs.

Remote Bow Rotation System
Rotatable brackets are available with a remote bow rotation system for remote bow direction control on applications with limited access.

Mount Hope Reconditioning Services
Experienced Mount Hope Service Technicians do a complete visual inspection of each incoming bowed roll. The roll is then disassembled ...roll, bearings, brackets etc. Each component is thoroughly cleaned and inspected for wear or misalignment.

Each bearing is dynamically tested to ensure precision and reject bearings are replaced with new bearings. Each usable bearing is cleaned and regreased with special greases that withstand high speed and high temperature operation.

Prior to reassembly each component and sub-assembly is tested and monitored for quality and reliability.

For information on the complete line of Mount Hope Rolls contact your Applications Sales Engineer.