Roll covers

Nitrile rubber, due to its oil resistance, is widely used in sealing applications, hose liners, roll coverings, conveyor belts, shoe soles and plant linings. Nitrile rubber is also available as a latex. 

Roll covers, and elements designed to utilise the high damping properties of this material are thought to be the major uses. 

SBR also finds use in conveyor belts, moulded rubber goods, shoe soles, hose and roll coverings. SBR is also available as a latex which is used in carpet backing and other applications. 

Rubber lining Rubber roll covering Tyre carcass Tyre tread Moulded tubes Footwear Soles and heels Mechanical goods Ebonites or hard rubber... 

The calendering process and its conditions are developed or modified according to the requirements of subsequent operations and the purpose for which the sheet is used. Thus for sheets which are to be open cured, such as in chemical plant lining and custom built items such as inflatables and ebonite pipes, roll coverings for paper and steel mills, the calendering needs to be more exact than the sheets which are used for blank preparation for molding of... 

Figure 80 Types of treater for applying corona discharge (a) for non-conductive substrates, with an earthed base roll covered with a dielectric (b) for material of all types, with a bare, earthed base roll and the dielectric on the discharge electrode The main components are (1) Multi-fin electrode (2) Electrode tube in ceramic or quartz (3) Earthed base roll covered with dielectric (4) Bare, earthed base roll (5) Housing for the electrode assembly, enabling the extraction of ozone and cooling of the electrode (6) Path of material being treated...

CSPE have excellent combinations of properties that include total resistance to ozone excellent resistance to abrasion, weather resistance even in light colors, heat, flame, oxidizing chemical, solvents, crack growth, and dielectric properties. Also provide low moisture absorption, resistance to oil similar to neoprene, low temperature flexibility is fair at -40C (-40F), low gas permeability for an elastomer and good adhesion to substrates. Can be made into a wide range of colors. Use includes hoses, roll covers, tank liners, wire and cable covers, footware, and building products (flash, sealing, etc.). 

Coated substrates involve different materials such as coated credit cards, paper, woven and nonwoven textiles, plastic or aluminum films and sheets, and roll coverings. Calender lines can process one coated side, both sides, or laminated (multiple substrates coated between each substrate). Calender with three rolls is usually sufficient for one-sided coating. However four rolls are used for extremely thin coatings. The 4-roll calender can be used for double-sided coating that is applied simultaneously on both sides. Specialized calendering equipment is used for certain products such as credit cards, floor tiles, and window curtains. 

The application of flexible sheet material to the surface of mandrels, called roll covering, is used in a variety of industries that include printing, paper, textiles, steel, office machinery, plastic fabricating lines, and many others (Figure 9.4). Their use includes to compress, drive, emboss, convey, protect, dye, suction, treat, pickle, paint, and print. 

Pressure of squeeze rolls Nature and hardness of squeeze roll coverings Length of immersion time Viscosity of solution or emulsion... 

Figure 11. Current flow with respect to rotating impression roll covering needed to overcome voltage drop due to high nip capacitance.

In the early stages of the development, the electrical properties of impression roll coverings were rather erratic. In this country, conductivity was imparted by means of conductive, structured carbon black fillers. It turned out that the exact steps in manufacture, such as milling temperature were as important as formulations. The conductivity of compounds made with Buna N was very strain sensitive. In Europe, conductivity was imparted by Anti-static additives. The electrical properties were more predictable, but resistance to wear left much to be desired. The manufacture of suitable roll coverings has been a real challenge to roll manufacturers, and suitable coverings have been available in the last five years on a very consistent basis. New Material which contain conductive polymers (Hercules Inc.) require some warm up before the desired conductivity level is reached, but have very uniform predictable electrical properties and stand up well to the wear and tear of press operations. 

Rods, hard rubber Roll coverings rubber for papermill industrial, steelmills, printers ... 

Tape, pressure sensitive (including friction), rubber Teething rings, rubber Thermometer cases, rubber Thread, rubber except fabric covered Tile, rubber Top lift sheets, rubber Top roll covering, for textile mill machinery rubber Toys, rubber except dolls Trays, rubber... 

BunaCB. [Bayer Miles] Butadiene rubber com. used in tires, belting, footwear soles, transmission belting for blending with NR in buffers, roll covers, seals, and inj. molded goods. in rubber blends. 

Latir. [Laur Silicone Rubber Congxling.] Silicone elastomers used fix o-rings, roll covering, hot stanq>ing dispersions used as adh ives, size coating, spUc-ii agem. 

Perbunan. [Ba rer Miles] NBRorNBR/ PVC fluxed blends used in tedL moldings, seals, sleeves, diaphragms, bellows, valves, vibration dampers, footwear soles roll covers, printing blankets, belting, fabric prongs, hoses, cable jackets, brake linings, sponge rubber, adhesives, profiles. 

Silopren. Payer] Silicone rubber used in seals and ofoer technical moldings and extrodates, roll covers, conveyor belting, cable and wire insulations, pharmaceutical goods. 

Paperboard This mill produces board for tubes, eores, furniture backing and roll covering on a 160 t/day 7-vat cyUnder-board machine. The system pH is neutral, and the temperature is 60°C. Water systans in this mill are nearly 100% closed. Additives used in the wet-end include alum, rosin size, cationic retention aid and various dyes. Poor foam control results in high entrained air measuronents in the vats (>6%) and... 

The major use of SBR is in the production of tires, particularly passenger-car and light-truck tires, and in other automotive applications where SBR is blended with other elastomers. These applications include belts, hoses, seals, and various extruded and molded items. Nontire and nonautomotive uses of SBR are in industries that require hoses, belts, gaskets, or seals. Others include footwear (shoe soles) various kinds of solid wheels roll covers coated fabrics and electrical (wire and cable) insulation. 

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