The Black Diamond hard rubber cover from Stowe Woodward has been the work horse compound for table rolls, breast rolls, wire return and wire turning rolls for over a quarter-century and is still the standard for many wet end applications.

The superior abrasion resistance of Dyna-X makes it the cover of choice for long life in most forming section applications. Dyna-X is preferred in doctored positions.

Fabmate, a softer cover at 12-15 P&J with an excellent coefficient of friction, is the long-life rubber cover of choice for plain and suction couch rolls. Micromate III is the ultimate long-life cover in a soft compound.

Breast Rolls
A large diameter roll, located near the stock inlet of the headbox, to stabilize the fabric through the sheet forming zone.

Breast rolls have steel shells with rubber or composite covers to aid in sheet formation and resist wear caused by fabric slippage.

Table Rolls & Wire Return Rolls
Used to convey the fabrics through the forming section, the table and wire rolls require a rock hard cover with high abrasion resistance to maintain a smooth surface finish and extend cover life.

In addition, the high abrasion resistant roll covers require release to resist stock build-up. A high coefficient of friction reduces fabric slippage and a smooth finish minimizes felt wear.

Wire Drive Roll
Located after the couch roll, the wire drive roll provides the horsepower transfer needed to drive the forming fabric.

Because of the potential for severe abrading, turning rolls are covered with highly abrasion resistant rubber and are typically 10 to 15 P&J with a high coefficient of friction to minimize fabric slippage.

Couch Roll
The couch roll dewaters the sheet as it is carried by the fabric to increase the sheet consistency to the level required for pick-up by the felt.

Suction couch rolls are typically supplied with large countersunk holes to maximize open area and are covered with highly abrasion resistant rubber or composite materials to minimize cover wear.

Lumpbreaker
A large diameter, lightweight roll located above a suction couch and operating at low pressures, smoothes the paper and enhances dewatering before it leaves the fabric.

Lumpbreaker rolls are covered with a very soft (160 to 250 P&J) high release cover compound that resists steam and chemical attack.

Cylinder Couch Rolls
The cylinder couch roll runs against the sheet-forming cylinder mold to produce a pressure nip that dewaters the sheet through the mold and transfers the sheet to the bottom of the felt, which transports it into the press section.

Cylinder couch rolls are generally soft rubber or polyurethane (200 to 250 P&J) that resist age and heat hardening. Cylinder machine applications also require excellent chemical resistance.

Suction Drum Rider
In a cylinder machine, the suction drum rider roll runs against the suction drum to form a nip for water extraction prior to the primary press section.

These rolls are covered with 1" to 1.25" thick highly abrasion resistant rubber or polyurethane at 70 to 125 P&J hardness and are drilled for optimum venting and dewatering.

Extractor Couch Roll
On a cylinder machine, the extractor couch roll runs against the extractor cylinder mold located after the last forming cylinder and creates a low pressure nip to remove water prior to the suction drum or primary presses.

Medium soft (90 to 150 P&J) highly abrasion resistant rubber or polyurethane covers with toughness and chemical resistance provide extended running time between regrinds.

Other Products & Services
To optimize cover performance and overall machine efficiency, Stowe Woodward Application / Service Engineers have available Nip Profiler, Thermography, Mechanical Services and other special technologies that increase the effectiveness of any forming section.