Azuka Blog TimesRopes June 5, 2018 azuka-admin A rope is a bundle of flexible fibers twisted or braided together to increase its overall length and tensile strength. The use of ropes for hunting, carrying, lifting, and climbing dates back to prehistoric times. Ropes were originally made by hand using natural fibers. Modern ropes are made by machines and utilize many newer synthetic materials to give them improved strength, lighter weight, and better resistance to rotting. More than half of the rope manufactured today is used in the fishing and maritime industries. History of Ropes: Although the origin of rope is unknown, the Egyptians were the first people to develop special tools to make rope. Egyptian rope dates back to 4000 to 3500 B.C. and was generally made of water reed fibers. Other Egyptian rope was made from the fibers of date palms, flax, grass, papyrus, leather, or camel hair. The use of such ropes pulled by thousands of slaves allowed the Egyptians to move the heavy stones required to build the pyramids. By about 2800 B.C., rope made of hemp fibers was in use in China. Rope and the craft of rope making spread throughout Asia, India, and Europe over the next several thousand years. By the fourth century, rope making in India had become so specialized that some makers produced rope intended only for use with elephants. Leonardo da Vinci (1452-1519) drew sketches of a concept for a ropemaking machine, and by the late 1700s several working machines had been built and patented. Rope continued to be made from natural fibers until the 1950s when synthetic materials such as nylon became popular. Despite the changes in materials and technology, rope making today remains little changed since the time of the ancient Egyptians. Raw Materials: Ropes may be made either from natural fibers, which have been processed to allow them to be easily formed into yarn or from synthetic materials, which have been spun into fibers or extruded into long filaments. Synthetic fibers include nylon, polyester, polypropylene, and aramid. Polypropylene costs the least, floats on water, and does not stretch appreciably. For these reasons, it makes a good water ski tow rope. Nylon is moderately expensive, fairly strong, and has quite a bit of stretch. It makes a good mooring and docking line for boats because of its ability to give slightly, yet hold. Some ropes use two different synthetic materials to achieve a combination of high strength and low cost or high strength and smooth surface finish. Next Blog: “The Manufacturing Process” coming soon…
Azuka Blog Polypropylene January 30, 2018 azuka-admin Polypropylene (PP) conjointly referred to as plastic, may be a thermoplastic chemical compound employed in a good style of applications. Associate in Nursing addition chemical compound made of the chemical compound propene, it is often created in an exceeding style of structures giving rise to a range of applications as well as packaging and labeling, textiles, plastic components and reusable containers of assorted varieties, laboratory instrumentation, automotive elements, and medical devices. It’s a white, automatically rugged, and proof against several chemical solvents, bases, and acids. In 2013, the worldwide marketplace for polypropene was concerning fifty-five million tones. Polypropene is that the world’s second-most wide created artificial plastic, once polythene. History Phillips crude chemists J. Paul Hogan and Robert Banks 1st polymerized propene in 1951. Propene was 1st chemical compounded to a crystalline isotactic polymer by Giulio Natta also as by the German chemist Karl Rehn in March 1954. This pioneering discovery junction rectifies the large-scale business production of isotactic polypropene by the Italian firm Montecatini from 1957 forrader. Syndiotactic polypropene was conjointly 1st synthesized by Natta and his coworkers. After polythene, polypropene is that the most vital plastic with revenues expected to exceed US$145 billion by 2019. The sales of this material as forecast to grow at the rate of 5.8% p.a. till 2021. Chemical and physical properties Polypropylene is in several aspects almost like polythene, particularly in answer behavior and electrical properties. The methyl improves mechanical properties and thermal resistance, though the chemical resistance decreases. The properties of polypropene rely on the relative molecular mass and relative molecular mass distribution, crystalline nature, sort and proportion of comonomer (if used) and therefore the isotacticity. In isotactic polypropene, for instance, the alkyl group teams as homeward on one facet of the carbon backbone. This arrangement creates a bigger degree of crystallinity and leads to a stiffer material that’s additional proof against creep than each neurological disorder polypropene and polythene
