In appliances like refrigerators and washing machines, these gaskets ensure a tight seal, maintaining efficiency and prolonging the product's lifespan In appliances like refrigerators and washing machines, these gaskets ensure a tight seal, maintaining efficiency and prolonging the product's lifespanOil seals come in a vast range of materials and compounds. Even older materials, such leather, are still used today. Nitrile is among the most common materials for oil seals but is slowly losing ground to PTFE, which is gaining popularity due to its effectiveness in high-speed applications.
Figure 4.5. Rubber reinforced with carbon black and CNT nanocomposite for better performance in tyre [42].
tc oil sealing. Incorrect installation can lead to seal failure, causing leaks and potentially damaging the machinery. Regular inspection and timely replacement of worn seals are necessary to maintain the integrity of the system. As can be seen from the seal cross-section shown in Fig. 14.2, shaft seals are complex shapes that require advanced mold design and molding techniques (see Section 7.3 for discussion of fluoroelastomer molding). For some time, most shaft seals were made in the United States by compression molding. Injection molding of shaft seals is prevalent in Europe, and is being used increasingly in the United States. An advantage of compression molding is that preforms (usually rings cut from extruded tubing) are used that closely approximate the amount of stock required for the final parts, so compound waste is minimized. For injection molding, the amount of cured stock in the central sprue and runner (actually a thin sheet leading to the seal lip) is often large compared to the stock required for the final part, so the waste of high-cost fluoroelastomer may be high. Such waste is reduced in modern injection molding designs.
Unscrew the pulley bolt anticlockwise with a socket and bar. Start it turning with a sharp blow on the bar.