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Rubber Roll Terms

Balance Correction – A process used to correct roller imbalance and associated rotation by either lessening roll weight through drilling or increasing roll weight by adding weights to the roll interior.

Balance Toleration – The amount of imbalance that a roller can tolerate while still working properly.

Ball – The bearing mechanism placed between roll races that keeps the internal race motionless, while permitting the rotation of the external race.

Ball Retainer – The mechanism that facilitates high roller speed through the separation of the bearing balls.

Bearing – A rotary support mechanism placed either on the interior or exterior of a roll to facilitate roll movement.

Calendering – A process by which paper is made by passing it between two rollers, smoothing and polishing the surface.

Coil Coating – A process in which a series of rubber rollers deposit a thin film of paint coating on a continuous metal or plastic web.

Doctor – A blade-like device that removes foreign matter from a roll. The doctor rests on the uprunning surface of the roll.

Dynamic Balancing – Balancing in which a certain degree of rotation occurs due to imbalance. Dynamic balancing is corrected in a balancing machine.

Durometer – An apparatus used for measuring the hardness of rubber.

Elastomer – A material, such as rubber, capable of returning to its initial length after being stretched at room temperature to twice its original length.

Glaze – A build-up on rubber rollers or the blanket of a printing press that negatively affects uniform ink distribution.

Piling – The building up of ink on the rollers, plates or blankets of a printing press.

Roping – Using a bar or roller to gather the full width of stretch film to create a “rope” that is nearly unbreakable.

Static Balancing – Balancing, often occurring in low-speed applications, in which the roll is properly balanced so that no rotation occurs.

Web – Paper used in print media, insert cards, etc. and sold in a roll for high volume, high-speed printing.

Web Handling – The industry involved in processing continuous material strips called webs that will be used in future processing operations. Common web materials include plastic, metal and paper.

Wrinkling – A deformation in a rubber roll in which folds and creases form on the surface of the roll.