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2.8.4 GLASS RECYCLING
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Different types of glass go through different recycling processes. For example, cookware melts at a much higher temperature than container glass and must be processed separately. This section follows the typical recycling process of container glass (such as beverage bottles). There are four types of glass related to recycling processes:
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Container glass (wine and beer bottles) Float glass (windows) Cookware (plates and dishes) Automotive glass (windshields)
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Glass for recycling is mostly collected from businesses or community drop-off sites. Trucks collect the bottles and transport them to be stored in a depot. When a processing batch of glass has been collected and delivered to the depot, it is all transported to a glass-recycling facility. Once at the recycling facility, the glass is crushed. Crushed glass is called cullet. Cullet goes through many processes to remove nonglass items. To remove ferrous metal, the cullet is passed through a strong magnet which removes the ferrous metals such as steel and iron. The removed nonferrous metals, the cullet, passes by powerful air jets which separate the metal pieces from the cullet. To remove lightweight items, such as paper, the cullet goes through a vacuum. To remove any remaining items that are not glass, such as ceramics, the cullet passes under a laser which rejects them. The cullet is now ready to be made into new glass. To make new glass, the cullet goes into a furnace where it is melted at a temperature of 2700 F. The high temperature turns the cullet into a liquid called molten glass. The molten glass is shaped into molds to
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make bottles or jars. Recycled glass is melted at a lower temperature than virgin glass, which saves 30 percent of the energy used.
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2.8.5 PAPER RECYCLING
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Collected paper must be sorted and graded before being recycled. The recycling process itself can be separated into eight steps
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Sorting Baling Pulping Screening De-inking Pouring Rolling Packing
This section provides a brief overview of each of these steps. Paper recycling can be challenging because there are over 50 grades of waste paper. The main four groups are
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Low grade (mixed paper, corrugated board) De-inking grade (newspapers, magazines, of ce paper) Kraft grade (unbleached brown backing) High grade (printer cut-offs and unprinted paper)
Large amounts of paper, including shredded paper, are baled before being transported to a paper mill. Once at the paper mill, the paper is placed into a large vat and mixed with water. The process breaks down the paper into tiny strands of cellulose bers. Eventually, this turns into a mushy mixture called pulp. The pulp is then ltered and screened. The screens are made of a series of holes and slots of different shapes and sizes, and remove any remaining contaminants such as bits of plastic of glue. For certain uses, pulp must also be de-inked. There are two main methods of de-inking
1 Washing Chemicals can be used to separate the ink from the paper and then washed
away with water. Although this process requires the use of chemicals and waster the quantities used are much less than the manufacture of new paper and the water can often be cleaned and reused. 2 Floatation Air can be passed through the pulp to produce foam. The foam holds at least half of the ink and can be skimmed off. Pulp is poured into a huge at wire screen. On the screen, water starts to drain from the pulp and the recycled bers quickly begin to bond together to form a watery sheet. The sheet, which now resembles paper, passes though a series of heavy rollers, which
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squeeze out more water, some heated cylinders, which dry the paper, and an iron roller, which irons the paper. Next, the paper is wound into a giant roll. One roll can be as wide as 30 ft and weigh as much as 20 tons. The roll of paper is cut into smaller rolls, or sometimes sheets, before being dispatched for use.
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