Bonding: Use commercially available bonding agents suitable for Nitrile rubber, such as Chemlok 205, Chemosil 211, or Cilbond 10 or 80/12.
Extruding: Maintain 60°C in the screw and barrel of the extrudder. Use of a die heater may be helpful but avoid excessive temperature. Adjust the temperature up or down as necessary. Extrude through a 60 mesh (minimum) screen.
Sheet Building: A calender thickness of 1.5mm (0.060") is recommended.
Wrapping: Use of polyester, nylon, cotton, or other types of tape are acceptable.
Curing: A 5-6 hour cure at 145 - 150°C has generally been found to be adequate for nominal size rollers. Length of cure time may need to be increased to accomodate larger rollers.
Please note that the above is meant to be a general guideline only. It represents conditions others in the industry have found to be satisfactory. Each manufacturer has to determine themselves as to what works best in their environment.
|Notable features of Nitrile
Nitrile rubber, also referred to as NBR or Buna N, is the workhorse of the roller industry. Chemically, Nitrile rubber is a copolymer of butadiene and acrylonitrile. Its primary claim to fame is resistance to attack by oils, and so consequently it has found use in printing rollers, where resistance to Paraffinic Hydrocarbon based inks is essential.
Other industrial roller applications involving exposure to oils and Paraffinic type solvents find Nitrile rubber the natural choice. In addition, NBR based compounds can be formulated for wet applications such as those found in the textile, papermaking and metal processing industries.
Nitrile rubber is used by the roller industry more than any other type of rubber.
|As Nitrile rubber is used in so
many different types of roller applications, it is found in several different series or
families of Chase Elastomer formulations. Please refer to specific data sheets on each of
Nitrile Rubber (this data sheet)