Current situation and development trend of the hot

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Current situation and development trend of plastic packaging materials (Part 2)

(II) development trend of domestic plastic packaging materials

1. High barrier and multi-functional films are developing to a new technical level

high barrier and multi-functional flexible plastic packaging materials have become a hot spot of development in recent years. In 2002, they are still making progress, and a number of new products and technologies have emerged, including high barrier, multi-functional fresh-keeping films Aseptic packaging film is developing faster. The original composite film is developing to a deeper level. The bag making and printing technology has reached a new level and entered the era of "Color Revolution". There are offset, gravure and flexographic color systems in the whole industry, which has promoted the in-depth development of flexible plastic packaging materials: the anti-counterfeiting packaging film is developing with each passing day, which is called the flower of flexible plastic packaging. In particular, the successful development of anti-static packaging film is of great significance. Electronic products, including electronic components, integrated circuits and printed circuit boards, have suffered serious losses due to damage caused by electrostatic discharge. The anti-static packaging film currently used in China is basically imported from the United States and Japan. The product has been successfully developed and put into production by Chongqing May 9th Research Institute of ordnance industry, Shunde Chengxin company and Zhongshan Dongsheng company

the development of dry composite film technology is inseparable from the technical progress of adhesives and inks. The adhesives of composite membrane include one component and two component polyurethane, acrylic adhesives, solvent-free, alcohol solvents, water-soluble adhesives, etc. from one component to two component is a progress. In 2002, the use of two-component adhesives reached 30000 tons, but there are still a lot of solvents discharged, polluting the environment. In addition, in the compounding process, there is a trace of solvent residue, which will produce peculiar smell in the packaging, and the sanitary performance is poor. These problems have been faced with the challenge of environmental protection for a long time. At present, foreign environmental friendly adhesives have entered the Chinese market, and domestic adhesive manufacturers are also actively developing them. Nearly 30 solvent-free production lines have been introduced, and the amount of solvent-free has begun to increase gradually. However, the technology can not meet the requirements of the coating and drying process, and the cost is also high. Therefore, the key to the problem is to find a new way that meets the development of the industry and meets the requirements of environmental protection. The fast curing adhesive introduced in the market in 2002 can be cut after changing the past compounding, and the curing time is shortened from 48 hours to 4-8 hours. In addition, Beijing GAOMENG Chemical Co., Ltd. has successfully developed a film composite adhesive with high additive content, which has improved the composite strength and reduced the residue, which is a great progress

2. The development of multi-layer coextrusion technology has changed 2. The product structure of functional films and containers with hydrostatic oil film gap sealing technology for oil cylinders has adapted to the market demand.

with the development of market economy, higher requirements have been put forward for the packaging of daily necessities, cosmetics, food and household appliances. On the other hand, with the growing demand for environmental protection, how to reduce the amount of garbage as much as possible on the premise of meeting the packaging functionality, so as to show that the packaging film and packaging container are developing towards lightweight and thin-walled. The high barrier film mainly based on dry compounding is easy to pollute the environment in the production process. The development of CO extrusion packaging film has the advantages of low investment in process equipment, low cost, strong adaptability Easy to operate. Coextrusion technology has developed rapidly in the world. Relevant data show that coextrusion packaging film in developed countries accounts for 40% of the whole flexible plastic packaging materials, while we only account for 6%. Dry composite film is still the main method, and the proportion of the two is unreasonable. At present, our co extrusion technology has also made new progress. At present, in addition to the promotion and application of the stacking head technology of Dalian Liaonan Dongfang Machinery Co., Ltd., the domestic coextrusion blow molding technology and equipment have passed the product appraisal and started mass production. The five layer co extrusion high barrier film blowing unit developed by Guangdong Jinming Plastic Equipment Co., Ltd. has passed the new product appraisal. The development of CO extrusion packaging film will change the product structure of multifunctional film, which is suitable for the packaging of liquid food, milk, fresh meat and other food

the development of coextrusion technology also meets the needs of industrial packaging. Qinchuan Machinery Co., Ltd. has successfully developed a six layer co extruded plastic hollow container for the production of automotive fuel tanks, with a maximum volume of 200 liters. The machine adopts new technology to ensure 100 control points for the wall thickness of the parison and make the wall thickness of the container uniform. Electrical, hydraulic and pneumatic pressure shall be stable without oil and gas leakage. The feeding system ensures the continuous and stable feeding of the six extruders. The production of this machine will change the single-layer situation of automobile fuel tank. With the development of automobile industry, the market of multi-layer fuel tank will have greater development space

3. The market prospect of fresh-keeping packaging film for vegetables and fruits is broad.

in 2000, the total output of fruits and vegetables in China reached 71million tons, and the output of vegetables reached 300million tons. China is the world's largest fruit and vegetable production and sales country. However, about 30% of the fruits were lost during storage, transportation and sales. Among them, improper packaging is one of the causes of fruit decay. In the highly competitive market, the role of packaging is becoming more and more important. As fresh fruits and vegetables are living beings, they are still breathing after picking and have vigorous life. To maintain life by consuming their own nutrients and water. If the fruits are not kept fresh in time after harvest, they will lose water and wither in 3-5 days (strawberry, litchi, longan, cherry, etc.) or more than 10 days and a half months (peach, plum, grape, etc.), and their quality will deteriorate and rot, thus losing their edible value. Although the physiological properties of different fruits are different, color change, water loss, taste change and decay are common problems. Therefore, how to inhibit the metabolic process, reduce the consumption of nutrients and maintain the flavor quality of fruits is an important issue of fresh-keeping packaging. At present, polyethylene film and polypropylene film are the most widely used packaging materials for fresh fruits and vegetables. Different fruits and vegetables have different requirements for fresh-keeping packaging bags. The following factors should be taken into account when choosing a film bag:

(1) suitable gas permeability and maintaining appropriate O2 and CO2 concentrations. According to the test, if the air permeability is poor and the O2 concentration in the bag is too low (3%), it is easy to produce ethanol and acetaldehyde volatiles, resulting in peculiar smell. Too high CO2 concentration (10%) will also cause damage to the fruit. Therefore, new polyethylene fresh-keeping films are also emerging. The appearance of microporous films has added new options to the packaging of tropical fruits, and the market and application of microporous films are increasing

(2) add ethylene gas absorbent. The fruit will release ethylene gas during Postharvest Ripening. The accumulation of ethylene in the packaging bag will accelerate the fruit aging and reduce the storage period. Therefore, it is necessary to add porous substances such as silica (zeolite, rutile, silica) in the film manufacturing process to adsorb ethylene gas. If the ethylene released from the fruit is adsorbed, the respiration of the fruit can be slowed down and the fruit can be kept fresh

4. There are attractive business opportunities in the plastic beverage bottle Market

the application market of plastic packaging containers is broad. Among them, the beverage industry has attractive business opportunities, and the demand for plastic containers for soft drinks, fruit juices, vegetables and beverages is increasing day by day

according to the survey, China's beverage output was nearly 23.86 million tons in 2002, with an annual growth rate of more than 20%, while the application proportion of PET bottles in carbonated beverage packaging accounted for 57.4%. According to the calculation of relevant institutions, the market prospect is promising. At present, the enterprises with large PET bottle output in the industry include Zhuhai Zhongfu and Shanghai Zijiang group, which respectively occupy 30% and 20% of the domestic PET bottle market share. Zhuhai Zhongfu Co., Ltd. is the first pet bottle manufacturer recognized by cola and Baile. In 2001, the number of PET bottles reached 3.2 billion, including 700million hot filled bottles, with a sales volume of 2.34 billion yuan. It has more than 30 factories throughout the country; Shanghai Zijiang group has developed rapidly in recent years, with 15 holding companies located in various regions, occupying the markets of Wuhan, Zhengzhou, Tianjin, Changchun, Kunshan and Chengdu. The newly built pet filling bottles with an annual output of 120million have been put into production. In 2002, it invested and built factories in Shanghai, Guangzhou, Chengdu and Beijing, with a production capacity of 485million hot filling bottles

polyester bottles started late in the plastic packaging industry. The introduction of a large number of injection, drawing and blowing technology and equipment has promoted the large-scale production of PET bottles. With its excellent performance, it has been welcomed by users. In just a few years, it has become the mainstream packaging material for the packaging of edible oil and beverage bottles. At the same time, the demand for cosmetics, medicine and other industries is also increasing. In 1996, the output of PET bottles was 3billion, but in 1998, it increased to 5billion, reached 8billion in 2000, 9billion in 2001, and is expected to reach 10billion in 2002. With an annual growth rate of 18%, it has become the largest variety of plastic packaging. Especially since 2001, with the sudden emergence of the domestic tea beverage market, the output of tea beverage in 2001 has reached 3million tons. Therefore, hot filled 85~90 ℃ PET bottles have become the fastest growing variety of polyester bottles, with an annual growth rate of more than 50%

The development of transparent polypropylene packaging bottle is a hot spot in plastic packaging at home and abroad in recent years. With the successful development of transparent modifier nucleating agent, 0.1% - 0.4% sorbitol xylene (benzaldehyde) nucleating agent (Milliken, Nippon physicochemical, Erjing Dongya, mil lad3988, etc.) is added to ordinary pp. high transparent PP can be widely used in injection, blow extrusion, blow drawing, extrusion, hot containers, food and drug bottles, etc. its price is appropriate, and it is a competitor of PS, ABS, pet and PE bottles, It has broad market prospects

5. The application of beer plastic packaging bottles has been the rapid development of heat-resistant polyester bottles (PET) used in the international beer packaging industry in recent years. In particular, the application of PET bottle coating technology (plasma technology) with a 0.21mm carbon layer inside, its permeability is almost the same as that of glass. At the same time, it can withstand high-temperature sterilization treatment, so that its application range is expanded, and it is suitable for the packaging of hot filled tea drinks

in addition, the new PET bottle of polyethylene naphthalate (pen), which has attracted the attention of the packaging industry, is stepping into the beer industry and causing a revolution in beer packaging (a good strategy to overcome the beer explosion). As the molecular structure of pen is similar to that of pet, the benzene ring is replaced by naphthalene ring, which makes pen more excellent than PET in terms of permeability resistance, UV resistance linearity, good heat resistance and high temperature resistance (the thermal change temperature of amorphous pen is 100 ℃ while that of pet is only 70 ℃). As naphthalene is separated from coal tar, China has rich sources, and industrial production is about to be realized. In the near future, pen will enter the packaging field in large numbers, triggering another packaging revolution after pet. At present, China imports a small amount, but the price is 5 times that of pet, which hinders the application of pen

China is a large beer producing country. Since 2002, it has reached 23.86 million tons, ranking first in the world. Based on the calculation of 2002 million tons, the annual demand for packaging bottles is 25-30billion, providing a broad space for the development of PET bottles. In recent years, the annual meeting of plastic packaging has conducted technical exchanges for many times to guide the development of relevant enterprises. From the technical point of view, beer is different from ordinary carbonated beverages. Even a small amount of oxygen entering the packaging container will change the taste of beer, and the loss of CO2 in beer will affect the foam characteristics. Therefore, how to meet the requirements of freshness and preservation period requires high barrier performance. At the same time, 95% of beer in China is produced by pasteurization, and the use of packaging bottles is required to be resistant to 62-67 ℃. These requirements become the key to the development of plastic beer bottles

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