Application of the hottest PET bottle in China's t

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PET bottle application in China's tea beverage packaging market

in recent years, tea drinks have been increasingly favored by consumers because of their healthy and natural drinking advantages. In Japan and Taiwan, the development is more rapid, so that in the world, the output of tea drinks is also rising. Tea beverage, according to the definition described in the classification of GB soft drinks, is: soak tea with water, extract, filter Tea soup made by clarification or other processes, or add water, sugar, sour agent, edible essence, fruit juice or plant (grain) into the tea soup Products made by modulating and processing extracts. In terms of types, there are pure tea, seasoned tea drinks, etc. In the 1980s, ITO garden of Japan first introduced instant tea drinks in the world with oolong tea as raw material. Because of its unique production technology and convenient drinking characteristics, tea drinks have become popular all over the world. Since China began to produce tea drinks in the early 1990s, dozens of beverage factories have launched dozens of varieties and achieved great development

at present, the packaging of tea drinks mainly includes PET bottles for hot filling, three piece cans, Tetra Pak, glass bottles, BOPP bottles, PE bottles and composite bottles. Because PET bottles for hot filling not only have the advantages of transparency, beauty, flexible shape and good oxygen isolation of glass bottles, but also have the advantages of light weight and convenient carrying of Tetra Pak and other plastic bottles, while avoiding the disadvantages of other plastic bottles, such as poor oxygen isolation, poor mechanical strength and poor light transmittance, Therefore, it is the most widely used tea beverage packaging material at present. This paper will focus on the application status and development prospect of PET bottles in tea beverage packaging in China

the history, current situation and future of China's tea beverage market

the survey shows that (AC nielse1, experiments can be carried out directly on parts, regardless of the size, thickness and shape of parts; n) in recent years, the development rate of China's tea beverage market has exceeded 300%, and tea beverage has become the third largest beverage after carbonated beverage and drinking water, with a rapid rise. In 1997, it was only about 200000 tons, and in 1999, it reached 800000 tons. In 2000, the annual output was as high as 1.85 million tons, and in 2001, the output of tea drinks exceeded 3million tons. Although the domestic tea beverage market has increased rapidly, there is still a lot of room for development in China, because this is not a large share compared with carbonated beverages, which account for 40% of the beverage market sales, and drinking water, which ranks second with 20% share. At present, the per capita annual consumption of tea drinks is 0.4L, and the average annual consumption of tea drinks in Japan is 20 ~ 30L, that is to say, tea drinks should have more than 50 times the growth space in the domestic market. Unlike many other products, which are oversupplied and have to engage in a price war, the tea beverage market is facing an optimistic situation. At present, sales are only concentrated in key cities, and the exploitable market is still large; In addition to the Pearl River Delta and Shanghai, the popularity of tea drinks in other regions is very low, there are few varieties, consumers have little choice, new technologies continue to appear, product varieties continue to update, costs continue to decline, the rapid growth period is estimated to be at least three years, and there is a long-term stable development situation

although China's tea beverage market has shown explosive growth in recent years, it has also led to the development of the packaging industry, but looking into the future, referring to the development trend of tea beverages in foreign countries, including Japan, Taiwan, the United States and other regions, we can see that at present, the variety, quality and market share of domestic tea beverages are different from those abroad. Last year, Japanese tea drinks reached 800billion yen. Due to the launch of new products of green tea and Chinese tea drinks, it is estimated that the market size of Japanese tea drinks will reach 1.3 trillion yen in 2007, accounting for about 23% of the whole cool beverage market. With the continuous improvement and development of market, technology, raw materials and equipment, China's tea drinks will certainly break through greater market space

various tea beverage packaging materials

tea beverage is not only a beverage, but also a high-tech product. Tea contains catechins, caffeine and other components, which not only give tea a specific functional role, but also bring some difficulties to its extraction and preservation. With the development of modern science and technology, the polishing damage layer in tea beverage production technology is also deep; The latter requires the use of fine materials, and many technical problems have been basically solved. At present, many manufacturers have begun to focus on the packaging and preservation of tea drinks. At present, the tea beverage packaging used in China mainly includes metal three piece cans, paper aluminum plastic composite brick Tetra Pak, glass bottles, BOPP bottles, PET bottles for hot filling, etc. The main parameters are shown in Table 1:

most tea beverage manufacturers in China used three piece cans as tea beverage packaging materials in the early stage. The advantages of this package are strong processing adaptability, small loss, excellent barrier property, bright colors of packaging and printing, and in previous years, many tea drinks in China did not have a good technology to solve tea cheese. Because its opacity can cover up its precipitation phenomenon, it has been recognized by certain applications. However, in the filled tea, the contents such as tea polyphenols are easy to react with the defects of the inner membrane of the three piece can, which makes the color of the tea soup black, produces metallic taste or other bad flavor, and reduces the quality of the tea beverage. The tea beverage has very strict requirements for the coating in the three piece can, which makes the packaging cost high. In addition, it is difficult to deal with environmental protection, and its development prospect has been affected to a certain extent. The national industrial policy does not allow a large number of promotion and use, and the consumption of aluminum iron cans has decreased year by year. Although glass bottles can be made into various shapes, and the packaging and printing can also be very exquisite, the high damage rate and recycling difficulties in their processing and transportation also limit their wide use. Tetra Pak (paper aluminum plastic composite Tetra Pak) can better maintain the flavor and color of tea drinks, and has a long shelf life. It is a popular packaging form in Taiwan at present, and has a considerable market in the mainland. However, due to the use of multi-layer material composite, the inner wall of the package and tea need to be sterilized separately, in addition to aseptic filling, GIP system cleaning, complex equipment, high cost, poor product visibility, difficult recycling and processing, and rigid packaging form, which also affects its application. The emergence of (PET) materials has provided new opportunities for tea drinks and provided considerable help in opening up new markets

since the early 1980s, pet (polymethylene telephthalate) has gradually become the fastest-growing polymer in the world packaging industry. The total world output increased from 8.08 million tons in 1985 to 13.72 million tons in 1995, an increase of 69.8%, of which pet resin for bottles grew the fastest. According to statistics, in the past decade, the annual average growth rate of the global use of pet has exceeded 10%. Pet has gradually begun to replace the status of traditional packaging materials such as glass and metal and become a new packaging material for food and beverages

for tea drinks, PET bottles with light weight, transparency, good barrier and high temperature resistance are ideal packaging materials at present. They have stable chemical properties, good oxygen isolation and aroma retention, and do not react with substances in tea soup. Ultra high temperature instant sterilization (UHT) can be used in the sterilization process, and sterile environment can be used in the filling process, so that tea soup, especially fermented tea, can maintain a relatively good flavor. The improvement of bottle making technology and the emergence of high temperature resistant PET bottles have further promoted its development

in addition, PET bottles can also be made into large capacity packaging, which is suitable for family banquet consumption. A 1L Tetra Pak weighs 28g, including 56g PET bottles, 61G aluminum cans, 137G tin cans and 360g glass bottles. It can be seen that PET bottles are light in material and contain more liquid per unit weight, which can greatly reduce the cost of packaging materials. Due to the light weight of packaging materials, packaging materials account for only 5% to 10% of the transportation cost per unit of finished products, while glass bottles account for as much as 40%. Therefore, from the perspective of packaging cost, PET bottle packaging has obvious advantages

the development prospect of PET bottles in the tea beverage packaging market

I. The traditional production technology and main problems of PET bottles

pet bottles have developed rapidly in the competition with other tea beverage packaging materials (glass bottles, horse mouth cans, BOPP bottles, etc.) because of their superior performance, relatively low cost and adaptability to environmental protection, However, its traditional production technology has limited its packaging of tea drinks with high requirements for heat resistance and good requirements for gas barrier and aroma retention. The traditional production technology of tea drinks mainly includes heat-resistant PET bottle hot filling technology and PET bottle quasi high temperature filling technology. The following is a brief analysis of these two processes and existing problems

1. Hot filling technology of heat-resistant PET bottles

this technology is based on the commercialization of heat-resistant PET bottles. It uses hot filling at 85 ~ 95 ℃ and then sterilization of the side bottle cap for 30 ~ 45s to achieve the purpose of fresh preservation. It is a technology widely used in most factories in China. In this technology, the sanitary requirements for PET bottle filling equipment and filling environment are relatively loose, and the process technology is easy to master and operate, but the PET bottle is required to be able to withstand a high temperature of 85 ~ 95 ℃. At present, only a few companies such as ASB in Japan, Sidel in France and krvpp conpoplast in Germany can provide heat-resistant PET bottle production equipment. The equipment and PET bottles produced are expensive. Take 500ml, 32g heat-resistant PET bottles as an example, the price is about 0.70 yuan, while the price of ordinary PET bottles is only about 0.35 yuan. Therefore, although the price of tea drinks in the domestic market is high, However, the high cost of heat-resistant PET bottles still poses a certain obstacle to the expansion and promotion of tea drinks in China

in addition, due to the high filling temperature and the need to maintain a certain period of time, the hot filling technology is not suitable for the production of tea drinks with more reducing substances such as green tea, which will basically oxidize the reducing substances, and the color and taste do not show the corresponding characteristics of green tea. At present, the relevant manufacturers can only use green bottles, and add other auxiliary raw materials, such as flower fragrance and honey flavor, to the green tea drinks as a means of compensation, If pure green tea drinks need to be produced, the hot filling technology also has great weakness

2. PET bottle quasi high temperature filling technology

this technology takes the temperature resistance limit of ordinary PET bottles as the starting point, through the matching filling production line, the requirements of the filling environment and the subsequent process, without adding any preservatives, to achieve the purpose of keeping tea drinks fresh. Because this process still requires relatively high filling temperature, PET bottles need a certain weight, 500ml bottles need more than 33g, and reinforcing ribs need to be set on the bottles, which can reduce the price of PET bottles to about 0.40 yuan

this technology has higher requirements on equipment and production control points than the hot filling process, and the price of bottles is still not the most reasonable data. The hot filling process still has a considerable destructive effect on the quality of green tea that is easy to oxidize

II. Development trend of tea beverage packaging

as tea beverage is a product sensitive to microorganisms, the packaging technology during filling is a great challenge, because the possible microorganisms will lead to the breeding of bacteria and molds, resulting in the deterioration of products. The traditional process technology is the hot filling technology of PET bottles. From the above analysis, it can be seen that the hot filling technology has some shortcomings, such as the taste deterioration caused by the high temperature of the contents of the container for a long time, as well as high equipment requirements, high energy consumption and high cost

the new aseptic cold filling technology of PET bottles has become a new trend in the development of tea beverage packaging because it overcomes some defects of traditional hot filling. This technology does not require the use of heavy hot irrigation

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