History of Pneumatic tyres

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Calendering

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Introduction: Calendering is the process of making thin sheet of rubber and also lamination of such sheet on to other substrate like fabric,cord warp sheet by passing through set if rollers under controlled Conditions. A calendar comprises of a number of rows or bowls held in frame. Rolls rotate in opposite directions either with even speed or with a friction ratio. Types Of Rubber material used Elastomers that can be used include: ·          Neoprene ·          SBR ·          Natural ·          Hypalon ·          Urethane ·          EPDM          Viton           Fluroelastomer         Butyl          Nitrile ...
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Chloroprene rubber

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Introdu ction: It is the first synthetic rubber developed commerically.In terms of consumption polychloroprene has become a most important speciality rubber for non tyre application Special properties: excellent flame resistance Properties: Good ozone resistance Good flame resistance History if CR The polychloroprene story started in 1925 with the synthesis of the monomer. 1938-  DuPont began marketing the polymer as neoprene. 1940-  Development of copolymer with sulfur made 1950-  Soluble sulfur free mercaptan modified grades were introduced. 1960- pre cross-linked grades were developed 1970- improved. Pre cross-linked grades were developed. 1980- xanthogen disulfide grades were developed 1990- Newly developed M and XD grades combining low Temperature flexibility, heat resistance and dynamic properties as well as low fouling. T he major Manufacturers of Chloroprene rubber are 1.  Denka 2.  Neoprene 3.  B...
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Rubber Cables

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INTRODUCTION: A cable is a flexible metal or glass wire or group of wires. All cables used in electronics are insulated with materials like plastic or rubber. These cables are widely used in various applications. They are used for trailing and flexible supply leads in either single or multi core versions. They will remain flexible even at sub zero temperatures.  These cables, though expensive have its advantages. Rubber is more durable, with high levels of water and abrasion resistance and hence these factors make cables made of rubber an attractive choice for outdoor applications. A high voltage cable must  have three components in it a)A Metallic conductor generally made of copper or aluminium. some times the conductor might be coated with Tin, gold, silver for better durability. b)An insulation that prevents direct contact unsafe proximity between conductor and other objects c)A seath or a jacket which is the protective covering from outside influence like weath...
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