Chips in the regeneration revolution of the hottes

2022-08-09
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New flexible packaging materials: chips in the regenerative Revolution (I)

the rapid development of flexible packaging applications, on the one hand, benefits from the good adaptability and ease of processing of flexible packaging materials, on the other hand, benefits from the improvement of the performance of flexible packaging materials, such as extending the shelf life of goods, reducing the use of materials and making them more convenient. The continuous introduction of new flexible packaging materials will become the biggest driving force for the rapid expansion of the market

functional film

flexible packaging materials have developed from the original single-layer film to a multi variety and multi-functional composite packaging film. The improved packaging can better protect goods, reduce the use of materials and make the packaging more convenient, so as to meet the personalized needs of the market to the greatest extent or better adapt to the needs of environmental protection. Through our investigation, cooking resistant film, antistatic film and high barrier film are widely used in China's flexible packaging production enterprises, and the corresponding packaging product output is high; Nano film and antibacterial film are adopted by more and more soft packaging factories, and the corresponding packaging output will also increase year by year

cooking resistant film

cooking resistant film is mainly used for heating and high-temperature sterilization. At present, it is widely used in Chinese flexible packaging production enterprises, and the technology is relatively mature. More than 58% of the flexible packaging factories in the country produce cooking resistant packaging, and the output in 2004 reached 253000 tons of anchor locks Φ Above 44mm, the average annual growth rate of output is expected to reach 18.4% from 2005 to 2010

the requirements of increasingly popular electromagnetic cookers and microwave ovens for packaging materials are that they are not significantly deformed, damaged, and the contents (additives) are non-volatile when used at high temperatures. In particular, the heating characteristics of microwave ovens do not allow the packaging materials to contain metal materials, which limits the use of cooking bags with aluminum foil as the intermediate layer and PE and PP as the inner layer. Therefore, the products used for microwave heating now mostly use the packaging made of multi-layer composite materials filled with PP and inorganic substances and crystalline polyester (CPET) sheets. New heat-resistant packaging materials with higher temperature resistance, such as polyester film, polyetherimide, poly (4-methylpentene) (TPX)/paperboard, have also been developed, and they can withstand temperatures above 180 ℃. Enough to meet the requirements of electromagnetic cookers and microwave ovens for packaging materials

antistatic film

electronic products with integrated circuits are very sensitive to static electricity and electromagnetic radiation. They generally require electrostatic shielding and isolation of external electromagnetic radiation during transportation to protect the performance of products. Flexible packaging materials used for such products generally require anti-static, anti electromagnetic radiation and other functions. In addition, some powder packed goods (such as washing powder) are easy to be adsorbed on the packaging mouth due to static electricity during packaging, which is not conducive to sealing. Antistatic soft packaging is used for the packaging of such products to solve this problem

it is understood that the antistatic films currently produced in China usually adopt additive treatment technology and coating treatment technology. The output of antistatic packaging produced by using antistatic film shows an increasing trend year by year, reaching 112000 tons in 2004. It is expected that the average annual growth rate will remain at about 12.3% in the next five years

high barrier film

in order to ensure the protective effect of packaging on the contents, many products require packaging materials to have high barrier. Using high barrier film to replace the traditional packaging method is not only simple and easy, but also low cost. At present, many supermarkets and flexible packaging users have realized the superior functions of high barrier film, such as quality assurance, freshness preservation, flavor preservation and shelf life extension. Industry insiders predict that the high barrier film required by supermarket groceries will increase by more than 50% in the next four years

the use of high-strength and high barrier plastic can not only improve the protection of food, but also reduce the amount of plastic when packaging the same amount of food, thus reducing the cost. At present, for vacuum packaging and inflatable packaging requiring high barrier protection, it is generally required that there must be more than one layer of high barrier materials in high-quality composite packaging materials. In addition to polyvinylidene chloride (PVDC), ethylene and vinyl alcohol copolymers (EVOH), which are widely used at present, in recent years, the development of environmentally friendly materials has led to the development of polyvinyl alcohol (PVA), polyethylene naphthalate (pen), copolyamide (MXD6), silicon or aluminum oxide thin films (soft glass), nano inorganic materials, etc. In 2004, the output of high barrier packaging in China has reached more than 110000 tons. It is expected that the output growth rate will reach more than 24% from 2005 to 2010

nano film

nanocomposite packaging materials have been rapidly industrialized with the rapid development of nanotechnology, and their wear resistance, hardness, strength, permeability and plasticity have been significantly enhanced and improved. The unique nano film process can greatly reduce the cost and ensure the stability of product quality. At present, nano antibacterial films are widely used in the food industry. Compared with ordinary thin films, its oxygen barrier property can be increased by 3 ~ 5 times. In the field of milk packaging, liquid milk aseptic packaging has high requirements for antibacterial freshness and bag breaking strength. The nano antibacterial function of adding high priced active silver ions can greatly prolong the shelf life and shelf life of dairy products. Moreover, the modified milk packaging also achieved unexpected results, and its thermal deformation temperature, tensile and bending properties have been greatly improved. It can be seen that the development of nano antibacterial packaging technology has a strong application prospect in the sterile packaging of liquid milk. In addition to being used in food packaging, nano film can also be used in special packaging, such as anti-static, anti electromagnetic, explosion-proof, invisible, dangerous goods packaging, etc., which will promote the great change of traditional plastic packaging materials

in 2004, the output of nano packaging in China was 0.35 tons. With the wide application of this new technology, the output is expected to increase year by year. It is expected that the average annual growth rate from 2005 to 2010 will reach about 5%

antibacterial film

using antibacterial film to package food, especially for packaging fresh fruits and vegetables, has great practical significance. The application of antibacterial materials and antibacterial technology can prevent the invasion of microorganisms such as mold on fruits and vegetables, and obtain better fresh-keeping effect. Antibacterial and mildew proof packaging is also used for weapons, export clothing, optical equipment and other products

at present, there are two ways to produce antibacterial plastic films: mixing antibacterial agents directly with plastic and dispersing them in plastic to make antibacterial plastic films; The antibacterial agent, carrier resin and other additives are processed into antibacterial masterbatch, and then the antibacterial masterbatch is mixed with plastic, and then the antibacterial film is produced. Among them, the technology of antibacterial masterbatch has many advantages, such as good dispersion effect, full utilization of antibacterial agents, and so on, which should be used more at present and even become the bottleneck of its utilization

in addition, Chinese flexible packaging enterprises have developed a brand-new masterbatch (content 1%~3%) with silver ions as inorganic antibacterial agents. Silver ions have significant antibacterial effect, which is characterized by long-lasting antibacterial effect and will not pollute the environment. The trial shows that the film made from the masterbatch containing 1% silver ion or the container with a layer of this film on the surface can completely kill the bacteria that will cause food poisoning in 1 ~ 2 days without nutrient source. This kind of antibacterial film is widely used in the packaging of cooked meat, aquatic products and liquid food. The output of antibacterial packaging has reached 49000 tons in 2004. With the improvement of antibacterial requirements of various commodities, the output of antibacterial packaging in the future will be 16. 5% per year The proportion of increasing its strength and wear resistance by 3% through appropriate heat treatment process has increased rapidly

in addition to several new flexible packaging materials mentioned above, there are degradable environmental protection packaging materials that can be treated by combustion, biochemical decomposition and insect eating; It is an active packaging material that can react with the oxygen inside the package through chemical action and consume oxygen in order to maintain food nutrition and flavor; Heat shrinkable packaging film with the functions of preventing scratches on the surface of goods, improving the appearance of goods, binding and anti-counterfeiting; Antirust packaging film with convenient use and excellent antirust function; With high strength and good tensile retraction, it is widely used for stretching and winding films of foreign trade products; Smart packaging materials that can detect bacteria, sterilize, detect pests and genetically modified raw materials, as well as packaging materials that can prevent ultraviolet damage to food, etc

multilayer composite film

multilayer coextrusion technology directly uses more than one kind of plastic particle (or plastic powder) as raw material, melts and plasticizes each kind of plastic through more than one extruder, and then supplies it to a pair of die (or through the distributor, merges the plastics supplied by each extruder and supplies it to the inlet die), and then after further processing, the multilayer composite film is prepared. The multi-layer composite film produced by multi-layer coextrusion technology does not need to make plastic particles into film-like intermediate products first. Multilayer composite films represent the direction of economy and environmental protection

according to the survey, multi-layer coextrusion technology is widely used in China's flexible packaging production enterprises, and the application rate has reached 76.9%. At present, multi-layer coextrusion technology mostly adopts the coextrusion and compounding of heterogeneous plastics. Commonly used are the coextrusion and compounding of polar polymer compounds such as nylon (PA), ethylene vinyl alcohol copolymer (EVOH), polyvinylidene chloride (PVDC) and non-polar polymer compounds such as polyolefin polypropylene (PP), polyethylene (PE), ethylene vinyl acetate copolymer (EVA). Due to the great difference in properties between polar polymer compounds and non-polar polymer compounds, the properties can complement each other. Through the complementarity between the properties of each layer of materials, high-performance composite films can be prepared. Therefore, multi-layer coextrusion technology is often used in the production of high barrier composite films

adhesives

solventless adhesives

solventless composite process manufacturing composite film packaging materials has gradually become well known to Chinese flexible packaging enterprises. The production of solvent-free adhesive can reduce the cost and will not cause environmental pollution due to the volatilization of organic solvents. No heating and drying equipment is needed, which reduces energy consumption; The composite products have no residual solvents, no odor or toxicity problems, and eliminate the erosion of solvents on printing inks; It does not contain organic solvents, which eliminates the influence that the composite substrate is easy to be damaged by solvents and high-temperature drying, and makes the dimensional stability of the composite membrane structure good. At present, the market share of solvent-free adhesives in Chinese flexible packaging manufacturers is gradually increasing. According to the survey, the production of solvent-free adhesives in China reached about 675 tons in 2004. Experts estimate that the average annual growth rate will be more than 50% from 2005 to 2010

aqueous binder

aqueous binder is a colloid formed by directly dissolving polymer in water or dispersing polymer particles in water. It can be made into water-soluble or water dispersive lotion. In the production process of composite packaging, water vapor rather than organic solvents is emitted, which will not produce any peculiar smell. Moreover, the viscosity of water-based adhesives is not significantly different with the change of polymer molecular weight, so the polymer can be quantified to improve its cohesion strength. The viscosity is generally lower than that of solvent based adhesives, and it is easy to mix with other resins or pigments to improve performance and reduce costs. Water based adhesives are non combustible and low toxic. They are suitable for substrates that are easily eroded by organic solvents. Among all kinds of water-based adhesives, the adhesive layer of water-based polyurethane adhesive is soft and tough, which is especially suitable for manufacturing various composite films for food packaging

various advantages of water-based adhesives make them widely welcomed by flexible packaging manufacturers. In 2004, the output of water-based adhesives in China reached 5580 tons

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