The hottest plastic packaging products and trends

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Editor's note: Although the development trend of the world's plastic growth rate in recent years is relatively slow, its production and sales continue to grow, so the demand for LDPE, RVC, pet and other materials is also increasing. However, many countries still need to import raw materials, which requires the plastic industry in the contemporary world to innovate plastic products. The following article briefly analyzes the development trend of plastic packaging products

according to relevant foreign data, the world plastic output will exceed 250 million tons in the 21st century. Although the trend of world plastic growth rate is slow in recent years, the production and sales continue to grow. The predicted annual increment rate of HDPE is about 6.0%; LDPE is about 4.6%; LLDPE is about 5.0%; PP is about 6.0%; PVC is about 3.0%; Pet is about 6.2%; PA is about 4.5%; PS is about 3.5%. Among them, PK accounts for about 35%; PP accounts for about 15%; PVC accounts for about 10%; Pet accounts for about 20%; PA accounts for about 7%; PS accounts for about 3%; Others account for about 10%. In 2002, the world demand for pet increased by 5.0% annually, of which the annual increase of diaphragm was 7.5%. The demand of developing countries has generally increased significantly

experts predict that in the world plastic market in 2002, the prices of PE (including LDPE, HDPE, LLDPE), PVC, PP homopolymers are cheaper in the United States and the Gulf market, the northwest European market is in the middle, and the Southeast Asian market is more expensive. While PP copolymer, PS, hips and pet are cheaper in northwest Europe, middle in the United States and Gulf markets, and more expensive in Southeast Asia

in terms of the development speed of the plastic industry in the modern world, Germany and Sweden rank first, followed by Japan and European countries, and the United States is slower. In terms of output, the United States, Western European countries, Japan and the northern United States take the lead in home furnishings, accounting for about 67% of the world's total output and 63% of the total consumption; Eastern European countries account for 9% of total output and 11% of total consumption; Asian countries and regions except Japan account for 13% of the total output and 17% of the total consumption; Latin American, African and Middle Eastern countries still need to import. At present, plastic packaging abroad shows the following development trends:

first, the development of copolymers and the development of copolymer composite packaging films

at present, some European and American countries have invested heavily in the development of non-polar and polar ethylene copolymers and grafting trimers, which will greatly improve the tensile and coextrusion properties of plastic films, and improve transparency, sealing strength, stress resistance, cracking resistance, as well as enhance stability, improve molecular weight distribution and extrusion rheological properties. If c4-lldpe is developed, the screw will not be damaged in the high-speed injection molding process; Haoc6-lldpe plastic film has excellent toughness and hardness; C6-lldpe stretch coextrusion film is of high quality; C8-lldpe film has excellent toughness; VLDPE (ultra low density polyethylene) film has good flatness, low melting temperature of its resin and good performance. Green manufacturing has become the internal need of enterprises to achieve sustainable development, with good mobility performance; C4-vldpe/vldpe (ultra low density polyethylene) is suitable for all kinds of plastic film packaging. Mixing LLDPE in the plastic coextrusion process can improve the extensibility and penetration resistance. Lldpe/ldpe can greatly improve the viscosity and toughness. Adding haoc6-lldpe and haoc8-lldpe can promote the stability of rheology, hot melting without fracture, plastic film products without tearing, etc

in modern China, 80% of small, medium-sized and micro enterprises rely on private loans to shape the process. Countries have adopted VLDPE to replace LLDPE, PP, EVA and PVC. In extrusion, injection molding and blow molding processes, VLDPE will occupy the flexible packaging market of medicine, medical treatment and cosmetics, and further impact the field of food packaging

foreign experts believe that the development focus of the contemporary world plastic industry lies in the comprehensive technology of plastic modification, coating technology of plastic products, rapid biodegradation of waste plastics, and recycling of plastics. If some European and American manufacturers adopt linear ethylene - α Olefin copolymer and ethylene vinyl acetate copolymer mixture/pa bag, suitable for packaging ice cream, milk fat and other foods

second, vigorously develop multifunctional composite films

a large number of multifunctional composite films have been developed abroad to further refine their functions. For example, the cold resistant film can withstand -18 ℃, -20 ℃, -35 ℃ low temperature environment; The series of moisture-proof films made of PP by moisture-proof treatment can be divided into several types, such as moisture-proof, anti condensation, anti steaming and cold, and adjustable moisture; The anti-corrosion film can package perishable, acidic and sweet foods; Stable stacking of friction film; Special PE film is chemical and corrosion resistant; Odorless insect repellent is added to the mothproof film; The heat-resistant film of Biaxially Stretched Nylon 66 is used to replace the Biaxially Stretched Nylon packaging food, and its high temperature resistance is up to 140 ℃; The fresh-keeping film has good sealing and mildew resistance, and there is no condensation; The water regulating film can absorb the ethylene gas released by fruits; The new special food packaging film can improve the fragrance retention of food packaging; The transparency of amorphous nylon film is similar to that of glass; High shielding film can maintain the stability of color, aroma, taste, nutritional indicators and taste quality; The metal protective film adopts LDPE modified film to package liquid products, which can be heat sealed in low temperature environment; PP synthetic paper is used to improve the light resistance, cold resistance, heat resistance, water resistance, moisture resistance, grease resistance, acid resistance, alkali resistance and medium impact resistance of the package

III. develop coextrusion packaging films and sheets

PP, PE, PVC color changing plastic sheets developed by Taiwan Zhang en industry company can be made into various cups, such as lighter shells, cups, wine glasses, straw and other plastic products. When the temperature in the cup and shell changes, the cup color and shell color also change. Japanese polystyrene paper company has developed coextrusion foamed PE board, PS board, foamed PE molding products and PP molding products with excellent shielding performance. For example, PP with a melt index of 7 g/10 phr and 4% PVC nonylphenyl ether are mixed to produce a 7 thick μ M OPP film, which has excellent self-adhesive and heat resistance

IV. development of packaging containers

at present, some new plastic processes have been introduced abroad. For example, the European market has introduced the use of PVC transparent coiled material instead of blow molding hollow containers, which can reduce the weight by 50%. The average gross profit margin of coated paper in China can be reduced to ⑵ by using recycled plastic as the intermediate layer in the layer coextrusion film process 59% of the cost, and the layer thickness is controlled by microprocessor feedback. Japan introduced pet and PC coextrusion, which not only has heat resistance, but also can resist; Hit resistance, pollution resistance and drug resistance have all increased, while the price has also decreased. PP foaming shrinkage standard sleeve is used for glass bottles, which can resist 90 ℃ pasteurization hot filling. The UK introduced special PP resin injection blow packaging bottles, which can achieve the purpose of light weight, high strength, uniform thickness and saving raw materials

plastic cups and composite cups (outer PS, inner PP, cover PS) are popular in foreign countries to package cold and hot drinks, wine and convenience food. France uses PE bottles to pack fructose and yogurt, while Germany uses PC bottles to pack milk. In foreign countries, food and cosmetics are also packaged in multi-layer molded cans. Soft plastic barrels filled with PE or EVA are suitable for liquid packaging

the development trend of turnover boxes abroad is standardization, serialization, matching and specialization, and attention should be paid to anti-aging, anti-skid, stable stacking height (positioning), overlapping, increasing R angle, corner strengthening, thin-walled light weight and high strength

foreign countries have developed a large number of special plastic cover products that adapt to various standards and uses. Renault of the United States uses aluminum foil, paper and concave as bottle caps, and heat shrinkable film caps in Europe replace aluminum caps. Japan has launched coating bottles with high temperature resistance of 280 ℃. CPI coating aluminum foil caps with six series specifications are used as lactic acid beverage bottles (high-frequency heat sealing temperature of aluminum foil is 180 ℃ -280 ℃)

v. development of packaging technology

the commonly used technologies for film heat sealing abroad are:

(1) ultrasonic method. The heat sealing time of PP, pet, PE, PVC, PA, coated paper and thermoplastic coated aluminum foil is less than 1 second, but it has an impact on the transparency of the film

(2) laser method: this method is mainly applicable to heat sealing of small-area films

(3) pulse method: the heat sealing time of this method is less than seconds. Coating PVDC and FLUOROACETIC acid on the surface of PP film can improve the heat sealing performance of PP film

popular packaging technologies abroad include: vacuum packaging (76cm/hg), sterilization at 100 ℃, and packaging cooked food products with pe/pet, pa/eva, etc; Inflatable packaging (CO2, O2, N2, ethanol gas) is widely used in food packaging; Modified atmosphere packaging is used to package fish products; Body fitted packaging uses ionic film instead of PE and PVC film; Fresh keeping packaging: fresh fruits and vegetables with breathing regularity are packaged with microporous breathable film, silicon film, etc; Sterilization packaging: high temperature short-time, ultra-high temperature instantaneous heating sterilization, pasteurization packaging beverage; Sterile packaging, sterile packaging, fruit juice and other beverages; The sterilization package adopts ionic film, disinfects with epoxy ethylene gas, and packages medical devices; Blister packaging is mainly used for tablet packaging; Antirust packaging add antirust agent in the film to package precision instruments; Stretch wrapping is mainly wrapped in unit packaging (pallet, pallet, etc.); Heat shrinkable packaging is mainly used for small parts packaging; Mould proof packaging: add mould proof agent to the film to package textile articles; Compressed packaging is mainly used for the packaging of light cotton clothes, down, etc; Cushioning; Soft polyurethane, PVC, foamed PE, PP, LLDPE, ionic polymer and other packaging materials are used for medium packaging

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