New requirements for the hottest plastic packaging

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New requirements for plastic packaging materials to enter green packaging

the main function of packaging is to protect commodities and make them easy to use and preserve. For food, because it is closely related to people's life and health, in order to prevent food pollution and deterioration, food packaging is not only required to be beautiful and pleasant, convenient and practical, but also to ensure quality and food safety from the inside. Undoubtedly, this puts forward higher requirements for the performance of food packaging materials, whether they are green and environmental protection, and the production design and production process of packaging

the materials used for food packaging must have high barrier properties, such as high oxygen resistance and oil resistance for fat food; Dry food requires high moisture resistance; Aromatic food requires high odor resistance; Fresh fruits and vegetables require certain permeability of oxygen, carbon dioxide and water vapor in the packaging; At the same time, packaging materials should have good mechanical properties, mainly including tensile strength, tear resistance, impact resistance, etc; It should also have good chemical stability and should not have any chemical reaction with the food inside; In addition, it also has high temperature resistance, which is suitable for high-temperature disinfection and low-temperature storage of food. At present, among the numerous food packaging materials, plastic products and composite packaging materials occupy a decisive position. However, due to certain defects of traditional plastic materials, such as environmental pollution, temperature resistance and barrier performance, they are generally inferior to metal and glass containers. Therefore, the rapidly developing food industry has put forward a new topic to the plastic industry - improving the existing plastic properties and developing new varieties, Improve the strength and barrier property, reduce the amount of garbage as far as possible on the premise of meeting the packaging functionality, and make the packaging materials and packaging containers lightweight. The viscosity of film hydraulic oil will affect the performance direction of the oil pump and oil pressure system of the material testing machine

pen will trigger another packaging revolution

the use of high-strength, high barrier plastic can not only improve the protection function of food, but also reduce the amount of plastic when packaging the same amount of food, and even reuse. In terms of cost performance, processed foods requiring high barrier protection, vacuum packaging, inflatable packaging, etc. are generally packaged with composite materials, and there must be more than one layer of high barrier materials in the multi-layer composite materials. At present, the commonly used high barrier materials in China include aluminum foil, nylon, polyester, polyvinylidene chloride, etc., but with the improvement of the requirements for food protection, copolymers with better barrier properties will become a development hotspot

at present, new polyethylene naphthalate (pen) packaging materials take the lead and are widely popular in the world. Because the molecular structure of pen is similar to that of pet, but the benzene ring is replaced by naphthalene ring, pen has better barrier and heat resistance than pet, especially good gas barrier and UV resistance linearity. Due to the industrial production of pen, pen will enter the packaging field in large quantities in the near future, triggering another packaging revolution after pet. Due to these advantages, pen also has broad prospects in the packaging of beverages, beer and cosmetics

inorganic high barrier microwave food packaging materials are favored

due to the defects that the packaging made of aluminum foil and some plastic composites is opaque, not easy to recycle, and cannot be used for microwave processing, SiOx plated materials developed in recent years can be used as substitutes. SiOx is coated with a thin layer of silicon oxide on pet, PA, PP and other substrates. It not only has better barrier property, but also has excellent adaptability to atmospheric environment. Because SiOx coating has high barrier, high microwave permeability and transparency, it can be used for soft packaging of high-temperature cooking and microwave processing food, and can also be made into beverage and edible oil packaging containers. At present, the SiOx coating cost is high, and the large-scale production technology is not perfect. China has begun a certain scale of research, and the brushes of DC generators are easily worn parts, which have been applied in a few developed countries

coextrusion packaging film has become a new choice

the parallelism error of the two pressure plates of the surveyor directly affects the measurement results, so it is clearly limited in the professional standards. The parallelism error conditioning disc is set in the new experimental machine, which is very convenient to solve the parallelism problem of the two pressure plates. At present, high barrier and multi-functional soft plastic packaging materials have become a hot spot in the development of the plastic packaging industry. In recent years, not only high impermeability, multifunctional fresh-keeping film and sterile packaging film have developed rapidly, but the original composite film is also developing at a deeper level; The successful development of anti-counterfeiting packaging film, especially anti-static packaging film, is also of great significance. At the same time, the breakthrough in bag making and printing technology has made the composite packaging film successfully enter the era of "Color Revolution"; The development of multi-layer coextrusion technology has also changed the product structure of functional films and containers, and adapted to the high requirements of environmental protection

with the increasing voice of environmental protection, it is particularly important to minimize the amount of garbage generated on the premise of meeting the functionality of packaging, so as to make the packaging film and packaging container develop in the direction of lightweight and thin film. Due to the emission of adhesives and solvents used in the production process of high barrier films based on dry compounding, it is easy to cause pollution, so the development of coextrusion packaging films has become a new choice

with the implementation of the international environmental standard ISO14000, new degradable plastics have also attracted much attention. BASF in Germany launched a degradable polyester resin polymerized with aliphatic diols and aromatic dicarboxylic acids under the brand of e-coflexd, which can be used in film production

metallocene materials are organometallic coordination compounds formed by the connection of transition metals and cyclopentadiene. Metallocene polyolefin is a polymer prepared by olefin polymerization with metallocene coordination compound (melallocene) as catalyst. Metallocene polymers have many advantages, such as good processability, good transparency, high strength, good film stability and so on, so they are suitable for food and pharmaceutical packaging

foamed plastics move towards zero pollution

the extruded foamed PP sheet of Italian AMUT company is the latest development of foamed plastic products. It uses Montell's high viscosity resin, high strength polypropylene (HMSPP), PP copolymer and low ODP chemical foaming agent to produce foamed polypropylene sheet (FPP) with fine pores and uniform distribution, with a density of 0.6 kg/m2. Compared with PP sheet with the same performance, it has low product density and can save 20% of raw materials, which is of great economic and environmental significance

the food industry is a sunrise industry in the 21st century, but with the continuous improvement of people's quality of life and the increasing emphasis on healthy consumption, there will be higher requirements for the quality and safety of food. Accordingly, the plastic industry used for food packaging will also usher in huge development space and development potential

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