In china, paper cement bag have the whole market before 80’s. During decades of development, laminated plastic woven bags are the most universal packaging material in cement industry in many countries, for example, plastics woven bags dominate the China market. Plastic woven bag is in constant improvement to meet the increasing performance requirements met in practical use. In the middle of 1980s, paper bags were in short supply plastic woven bags gradually got prevailed and became the main trends for cement packaging. Plastic woven bag was used in cement packaging in early 1980s. Plastic woven bags were invented in 1950s, main components were polyethylene, polypropylene and their composites. Cement was initially packaged in wooden casks, later changed to jute bags, which proved to be dusty. And in 1965, uniaxial oriented filament was put into mass production in Europe to manufacture woven bags for industrial packaging. In 1950s, O.B.Rasmussen used extruded film and drawing machine, invented the fiber for weaving. History of plastic woven bag In 1930s, H.Jaeque invented a new technology to make cut cellosilk and split-film fiber through his study of PVC. So laminated pp woven bag is the first selection for cement packaging. The raw material is get from oil and it is environmental-friendly. PP cement bag is low cost and high price-quality ratio. Laminated pp woven bag is Durable and hard to break, Light Weight so can save the freight for transfer, Moisture / Water Resistant, not easy to take dust and Reusable.
And Chinese government set a policy to forbid the pp woven bag without lamination in 90’s. Final laminated polypropylene woven bag came. In 80’s, PP woven bag is used in cement packaging, and be in a rapid development This bag has a defect. Syndiotactic polypropylene was also first synthesized by Natta and his coworkers. This pioneering discovery led to large-scale commercial production of isotactic polypropylene by the Italian firm Montecatini from 1957 onwards. Polypropylene was first polymerized to a crystalline isotactic polymer by Giulio Natta as well as by the German chemist Karl Rehn in March 1954. When cement in paper bags was introduced, it sold at 127 pounds gross and 125 pounds net per bag. Paper lined jute bags were developed which led to the present multi-walled paper bag. The jute bags proved to be to dusty leading to a docker strike. were designed to supply remote area by camel transportation. In 1906, steel drums, semi-circular in cross section and equal to half a normal drum.
Later cement was supplied in jute bags of 125lb.(56.7 kg) (Penn 1977), as well as wooden casks and light gauge steel drums of 400 lbs gross (375 lb. Cement produced in Australia was initially supplied in similar sized wooden casks (C&CA 1928). Imported cement was packaged in wooden casks11, each containing 3 bushels12, about 4 to 4.25 cubic feet (about 170 kg net) depending upon the fineness of the cement. Packaging Details : History of cement package from wooden casks to final Polypropylene woven bag.Because of PP cement bag’s advantages PP cement bag is the future trend in cement packaging. advantages of our product: flexible and of high strength, resistant to chemicals (alkali and acid resistant), corrosion resistant resistant to fungal growth moisture resistant - virtually unaffected by water and atmospheric moisture, doesn’t absorb water lightweight 100% recyclable laminated polypropylene cement bag raw material 100% new pp or as the customers' requirement color white, yellow as the customers' requirement printing offset printing width as the customer's requirement length as the customer's requirement weightsm2 as the customer's requirement top heat cut or hemmed bottom singledouble folded, singledouble stitch lamination yes packing 400 per bundle, can be customized minium order 300, 000 lead time 15 days after place an order payment term lc, tt Our product is of high quality and pretty competitive price. Is experienced in woven pp cement bags for 10 years, establishing good cooperation relationship with big companies. Cheap Vertical Window Blinds (cement bag)
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