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Valley Roller General Industrial


General Industrial

Industrial applications utilize rubber covered rolls to accomplish various mechanical functions. Rollers may be used to feed, squeeze, protect, isolate, insulate, conduct or dissipate an electric charge, etc.. All general industrial applications have their unique parameters that must be met. Whether it is solvent and chemical resistance or hardness and modulus, each compound must possess characteristic attributes which match the requirements of the specific application to be an effective roll covering.

General industrial is a broad classification of industries and applications that utilize rubber rolls to perform some particular task. Typical industries that fall into this classification are Coating Industry used to apply paint to various metal decorating applications; Wood Industry where rollers are used in sanding and pressing operations also to apply glues/stains/varnishes; Food Industry where rollers are used in direct and indirect food packaging operations for rice, peanuts, meat; Leather Industry where rollers are used in stripping and treating operations; Glass Industry where rollers are used in forming processes, cleaning and application of chemical treatments/tinting; Roofing Industry where rollers are used to apply asphalt to felts, sand to shingles and carry the product through the process; Textile Industry where rolls are used for dying, bleaching, mercerizing and slashing applications; Material Handling Industry where rolls are used to drive, guide continuous belts in a variety of industries.

Rollers are used in all these industries and many others but the physical property requirements of each of theses industries vary from application to application. The target objective in all of these applications is the same, elastomeric compositions must be capable of creating a uniform pressure zone called a “NIP”. To insure that the nip region remains constant, the properties of the roll covering must be stable and not degrade with use. The selection of the roll covering must take into account the physical properties of the covering originally (i.e., static) as well as physical properties of the covering in use (i.e., dynamic). An effective covering must not change appreciably in use, as determined largely by the environment e.g. solvent and chemical exposure, as well as the dynamic properties of the roll covering.

All elastomeric coverings have unique chemical structure that largely determines suitability in a particular application. If a rubber composition is used with a non-compatible solvent or chemical, swelling and softening of the cover can occur, then optimum performance is never achieved. The difficulty in ascertaining the suitability of a covering in a specific roll environment has to do with the fact that the solutions typically are multi component solutions that can be a blend of various solvents and/or chemicals. This can drastically impact the selection process since chemistry varies so much. If the chemistry environment were single component solutions the selection process would be simple, but most solutions have synergistic reactions taking place that makes the selection process much more complex. Also, the specific compound ingredients in the various roll coverings play a role in balancing the chemistry. This is why different roll coverings of a given elastomer exhibit varied resistance to a given media.

Coating Industry

Rubber covered rollers are used in metal decorating applications to apply paints, varnishes, and UV coatings. The coverings utilized in these applications require chemical compatibility with the Ester, Aromatic or Water based solutions which are applied to various metal substrates. Typical metal coating applications are aluminum beverage cans and window blinds. These coverings have been very successful in their own right, but consideration for the operating environment is essential to select the most suitable covering.

Coverings Hardness Range Max Temperature Chemistry
Polar-Rite™ 30-70 Shore A 350° F Esters & Ketones
Val-Rite™ 40-70 Shore A 250° F Water Based
Dura-Coat® 40-70 Shore A 300° F Water Based
Val-Rite™ Plus 40-70 Shore A 250° F Aromatics


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WISCONSIN
N257 Stoney Brook Road, Appleton, WI 54915-9444
Phone: (920) 733-1991 | Fax: (920) 733-3722

TEXAS
101 Sentry Drive, Mansfield, TX 76063
Phone: (817) 453-8950 | Fax: (817) 453-1501