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Rubber introduction |
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| Release time:2013-03-27 Source:admin Reads: | |
| Rubber is produced from natural or synthetic sources. A material can make small as pvc labels and big as truck tires. Natural rubber is obtained from the milky white fluid called latex, found in many plants; synthetic rubbers are produced from unsaturated hydrocarbons. Long before Colombus arrived in the Americas, the native South Americans were using rubber to produce a number of water-resistant products. The Spaniards tried in vain to copy these products (shoes, coats and capes), and it was not until the 18th century that European scientists and manufacturers began to use rubber successfully on a commercial basis. The British inventor and chemist Charles Macintosh, in 1823, established a plant in Glasgow for the manufacture of waterproof cloth and the rainproof garments with which his name has become synonymous.A major breakthrough came in the mid 19th century with the development of the process of vulcanisation. This process gives increased strength, elasticity, and resistance to changes in temperature. It also renders rubber impermeable to gases and resistant to heat, electricity, chemical action and abrasion. The modern process of rubber manufacture involves a sophisticated series of processes such as mastication, mixing, shaping, moulding and vulcanisation. Various additives are included during the mixing process to give desired characteristics to the finished product such as pvc labels, bag, tire ect. Silicone rubber is a kind of rubber frequently used in the clothing. PVC labels made by silicone are more safety. It is a polymer containing silicon together with carbon, hydrogen, and oxygen. During manufacturing, heat is required to vulcanize (set or cure) the silicone into its rubber-like form. This is normally carried out in a two stage process at the point of manufacture into the desired shape, and then in a prolonged post-cure process. It can also be injection molded. |
