Power transmission belts

Neoprene and Ethylene-co-Propylene Rubber Blends for Power Transmission Belt Application. Rubber Division, Proceedings of the American Chemical Society, Nashville, TN, Sept. 29-Oct. 2, 1998, Paper No. 52, 1-28. 

The most common adhesive system used for bonding continuous fibers and fabrics to rubber is resorcinol-formaldehyde latex (RFL) system. In general, RFL system is a water-based material. Different lattices including nitrile and SBR are used as the latex for the adhesive system. 2-Vinylpyridine-butadiene-styrene is the common latex used in the adhesive recipe. RFL system is widely being used in tires, diaphragms, power transmission belts, hoses, and conveyor belts because of its dynamic properties, adhesion, heat resistance, and the capacity to bond a wide range of fabrics and mbbers. 

Therban. [Bayer Mite] Saturated hydrocarbon ACN copolymer qwcial elastomer for power transmission belting, hoses, membranes, seals, gaskets, b ws, linings, extruded profiles fix automotive, industrial, and oil field q>piics. 

Uses of flat conveyor and (power) transmission belts and V-belts (for power transmission) are to be found in almost all major industries. V-belts for different types cover applications ranging from fan belts for automobiles, belts for low-power drives for domestic, laboratory, and light industrial applications, to high-power belts for large industrial applications. 

Natural rubber finds its major use in the manufacture of pneumatic tires and tubes, power transmission belts, conveyer belts, gaskets, mountings, hose, chemical tank linings, printing press platens, sound and/or shock absorbers, and seals against air, moisture, sound, and dirt. 

Does the facility have power-transmission belts ... 

The development has been commercialized (by DuPont) as a masterbatch for elastomers (for power transmission belting, hose, tyre bead and tread areas, bearings, packings, and seals) and for thermoplastics (for a wide variety of applications). A similar development has been reported by Akzo. 

Adhesives, automotive, bridge bearing pads, cable jackets, cellular products, coated fabrics, conveyor belts, footwear, hose, power transmission belts, profiles, roll covers, sheeting, and tank lining. 

Hydrogenated nitrile rubber (HNBR) can be blended with NR to improve its oil and ageing resistance without drastically alfecting the dynamic properties. HNBR is widely used to make vibration dampers, timing belts, power transmission belts and bearings because of its ideal balance of properties like excellent heat and oil resistance coupled with good mechanical properties. It combines the oil and fuel resistance of NBR with the heat and oxidation resistance of EPDM rubber. The polarity dilference between the polymers could be reduced by the incorporation of small quantities of dichlorocarbene modified NR (DCNR), which is formed during the alkaline hydrolysis of chloroform in the presence of NR. Some studies in this respect have been reported in the literature. ... 

Bonds between rubber and substrates can fail for a number of reasons. Section 12.1 deals with some of the causes of rubber to metal bond failures. Section 12.2 examines the type of failures which are adhesion related, in fabric or cord reinforced power transmission belts. Section 12.3 discusses a phenomenon which causes service failures of rubber components, mainly in sealing applications. This phenomenon arises through a bond which is formed between the rubber (nitrile) and the metal mating surface of a valve or similar, which is of sufficient strength to rupture the rubber surface when the valve is opened. 

Rubber Bonding in Power Transmission Belting 12.2.1 Introduction... 

The belts are manufactured by first putting a fabric sleeve around a mandrel which has the belt teeth formed in it. The cord is then helically wound along the mandrel (this means that in a finished belt the cords do not lie along the axis of the belt but at a slight angle to it). The rubber compound (mixed but uncured) is then placed around the cord before an outer casing applies pressure to force the rubber compound into position and heat is applied to cure the rubber compound once it is in position. Once the curing process is complete individual belts are cut to width from the stock. Similar methods are used to manufacture most types of power transmission belt. 

As with most rubber composites the adhesion system used in power transmission belts is based on an resorcinol/formaldehyde/latex (RFL) type system. General overviews of RFL adhesion systems from a tyre cord perspective have been previously published by Takeyama and Matsui [31], and more recently by Solomon [32]. Bonding with RFL systems is achieved through applying an RFL coating to the fibre structure prior to the... 

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