Under the current situation of the development of

2022-08-10
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As mentioned above, the Japanese glass bottle manufacturing industry has lost some market share in the competition with other products, such as polyester bottles and metal cans. At the same time, we have to face the very stringent requirements of customers for the quality of glass bottles. In order to save this difficult situation, the Japanese glass bottle association has played a major role by promoting the "3R" principle of reduce, reuse and recycle. This first means "reducing the consumption of raw materials through the use of ultra lightweight bottles", second means "reusing glass bottles through the production of recyclable glass bottles", and third means "recycling glass bottles through the use of ecological glass bottles containing more than 90% of waste glass". Figure 7 is drawn by Emhart of the United States in 1970, which quantitatively describes the lightweight index of glass bottles, that is, the relationship between glass bottle capacity and weight. Japan now basically recommends ultra lightweight bottles with an L value of 0.7 or less to consumers. As can be seen from figure 8, the average weight of Japanese glass bottles has decreased by 113 grams since 1980. The main reasons for the weight reduction of glass bottles are "promoting lightweight", "increasing small glass bottles" and "reducing reusable glass bottles". Figure 9 shows the output of ultra light weight bottles in Japan in the past five years. In 1999, there were 42 kinds of ultra light weight bottles, accounting for only 0.5% of the total output; By 2003, there were 219 bottle types, with a share of 3%, an increase of 5 times. Among them, lightweight bottles for packaging seasonings have developed the fastest. In terms of quality and appearance, the quality of most ultra light weight bottles is solid, the proportion of green ultra light weight bottles is small, and amber products have not been produced yet. At the same time, Japan also requires that graphic trademarks be printed on ultra light weight bottles. Figure 10 shows the production of glass bottles and the use of broken glass. The amount of broken glass purchased from suppliers and households has hardly changed much, but the proportion of raw materials used has decreased. In general, the use of broken glass has exceeded 80%, and is still growing slightly. Although the total output of glass bottles is declining, the household broken glass remains unchanged. The reason is that the increasingly stringent quality requirements of customers are improving year by year, and the burial rate is also being tested one by one; A tensile connector is installed between the moving cross beam and the upper cross beam

Figure 11 shows the recovery rate of steel cans, aluminum cans, glass bottles and polyester bottles, but there are no waste pen refills in China. The recovery rate of glass bottles is as high as that of steel cans and aluminum cans. Glass bottle recycling is mainly to return to the production of glass bottles. In contrast, although it is not indicated in the figure, most of the recycling of polyester bottles, steel cans and paper products is used to produce other products. From the perspective of environmental protection, which the world pays more and more attention to, there is no doubt that glass bottles are relatively environment-friendly packaging products

in recent years, Japan has made unremitting efforts in developing new processes and directly combining them with production for improvement. For example, Toyo glass company, founded in 1888, is to pay close attention to scientific research and concentrate on product research and development. In this case, the company is a leading enterprise in the manufacture of glassware in Japan. It has three glass bottle manufacturers, accounting for about 30% of the domestic market. In addition, there are several joint ventures all over Japan and overseas. Toyo glass machinery factory produces is bottle making machines, product inspection machines and molds, especially in the light weight of glass bottles, and has made some achievements. There are mainly five aspects to determine the success of lightweight: the first is glass melting, which requires to control stones and bubbles to a minimum. The second is the molding process, which ensures high strength when the glass bottle wall is very thin. The third is surface treatment. Spraying is an essential technology for the production of lightweight bottles at present. The fourth is inspection, which can remove defective glass bottles, and different defects require different inspection equipment. The fifth is strength analysis. The most important thing is to use computers to analyze the temperature and strength of glass bottles. The global plastic processing machinery market will grow at a rate of 6.9% every year. These five factors are equally important in the production of ultra light weight bottles. There are many other important considerations, such as avoiding inner surface microcrystallization, thickness of thermal spraying, management of cold spraying process, "removing thin bottom products through a glass bottle impact tester", "removing thin wall products through a new glass bottle extruder", and 100% detection of glass bottle wall thickness distribution. Using the above technology, Toyo company reduced the weight of reusable 200 ml milk bottles by 50%, and the weight of reusable 900 ml milk bottles by 40%, that is, from 480 grams to 280 grams

source: China Packaging

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