Green food packaging covers a wide range of areas. The first is that the packaging materials used are fully compliant with food packaging regulations and standards. First of all, we must understand the characteristics of the materials used in the packaging, we must study in the process of packaging and printing bag making process, do not use raw materials that are harmful to the human body and affect environmental health. It is also necessary to study the recycling and recycling of packaging containers after use, or the degradation of polymer packaging material waste under natural conditions, without affecting all aspects of ecological and environmental hygiene.
Green food packaging must comply with health regulations and standards. In order to protect the health of the people, food packaging and printing materials must fully comply with hygiene standards and do not allow harmful substances to contaminate the packaged food. For example, the export food must be green food and green packaging. The international market has strict health regulations and standards.
1.FDF health regulations and standards. The original intention was the health regulations formulated by the Food and Drug Administration under the US Department of Education and Welfare, and strict regulations were made on the hazardous substances contained in food plastic packaging materials. It has certain authority internationally. Therefore, all countries have referenced the FDF standard when formulating food packaging hygiene regulations.
2. China has formulated food packaging regulations and standards. As early as 1980, China formulated the Hygienic Standards for Polyethylene Molded Products, Hygiene Standards for Polyethylene Resins, Hygienic Standards for Polypropylene Molded Products, Hygienic Standards for Polypropylene Resins for Food Packaging, and Polystyrene Molding. Hygiene Standards for Products and Sanitary Standards for Polystyrene Resins. In 1981, it also enacted the "Hygienic Management Measures for Plastic Products and Raw Materials for Food," "Food Sanitary Management Measures for Food Packaging," and "Hygienic Standards for Food Packaging Paper."
The types and uses of green food packaging Many methods of green food packaging are classified. Divided according to techniques: moisture-proof packaging, waterproof packaging, anti-mildew packaging fresh-keeping packaging, quick-freeze packaging, breathable packaging, microwave sterilization packaging, aseptic packaging, inflatable packaging, vacuum packaging, deoxygenation packaging, blister packaging, body packaging, pull Extension packaging, cooking bag packaging. The above-mentioned various packages are made of different composite materials, and their packaging characteristics correspond to the requirements of different foods and can effectively protect the quality of foods.
Choice of green food packaging materials 1. Selection of green food packaging and printing substrates: 1 It must fully comply with hygiene standards. That is, the substrate itself does not undergo the migration of harmful substances, and it is non-toxic, odorless, and has no odor. 2 must have a certain degree of mechanical strength (such as: tensile strength, tear strength, burst strength, peel strength, etc.), smooth surface, non-absorbent, anti-corrosion and other excellent performance. For example, moisture-proof packaging, vacuum packaging and air-packing of food should have the function of blocking the water vapor in the environment, the penetration of oxygen into the packaging, and preventing the escape of inert gas. Frozen food packaging must have low temperature freeze resistance. For packages containing fats and oils, have oil resistance and UV penetration resistance. For tea preservation and fragrant packaging, composite materials with the best barrier properties should be used.
2. Composite materials are the most important materials for green food packaging. Composite material refers to the compounding of two or more films to form an integrated material. This material overcomes the disadvantages of a single material, maintains the superior properties of the original component, and produces new properties. Composite materials can be broadly divided into structural and functional categories. The composite materials used for packaging and printing belong to the structural type and are composed of a basic material and a reinforcing body. The basic material is a plastic film, and the reinforcement body is composed of an organic fiber material (such as paper) or an inorganic body (such as aluminum foil). There are also basic bodies and reinforcements that are all plastic.
At present, there are more than 500 kinds of composite materials. The development of green food composites has tended to be diverse, multi-functional, and multiphase composites. The nano-composite material (refers to the grain structure and grain boundary of the material reaches the nanoscale size level) and can be said to be the latest technology product.
3. The use of packaging and printing technology is an important part of obtaining green packaging. Flexible packaging printing is a special printing process that refers to flexible packaging materials, that is, a color image replication process. From the color point of view, it needs to go through three stages of color decomposition (color separation), color transfer (level transfer) and color combination. Also includes post-press processing, such as: compounding, slitting, heat sealing, bag making (box) and other processes. In every process, the use of modern new technologies instead of traditional processes is an effective way to ensure the availability of green packaging. For example, electronic color separation and electronic engraving are used to replace the backward photogravure production process to avoid the release of corrosive liquids and endanger the environment. For another example, water type gravure ink is used instead of solvent type gravure ink. Solvent-free dry-type composite process is used instead of solvent-based mode. This solves the problem of solvent evaporation affecting the ecological environment during printing and compounding operations.
Evaluating the Role of Polyolefin Plastics in Packaging Changes and the Impact of Waste After Use on the Environment 1. The Role of Polyolefin Plastics in Packaging Change: Polyethylene in Polyolefin Plastics from the 1950s to the 60s Plastics such as polypropylene and polystyrene have come out one after another. It is processed into a transparent packaging film, which has the advantages of lightness, transparency, non-toxic, tasteless, moisture-proof and oxygen-proof, and acid and alkali resistance. It is recognized by the world that it is the best packaging material for food contact. At that time was known as the "white revolution" of packaging materials. No other packaging material can be substituted until now.
2. The flexible packaging printing materials such as paper and aluminum foil can meet the requirements of modern food packaging only by compounding with plastic films. 1 Paper: The paper used for packaging includes base paper, whiteboard paper, coated paper of 60k or more, offset paper, gravure web, and synthetic paper. Its main advantages are white color, easy shape, easy to print, bright color patterns printed, clear and bright, moderate contrast, vivid image and so on. The main disadvantage is that white paper contains brighteners that are harmful to human body. Strictly speaking, it is not appropriate to directly package foods. The base paper does not contain brighteners, but its color is poor and its surface is rough, so it is rarely used in packaging printing. In order to make up for the lack of white paper packaging performance, often use paper-plastic composite method. 2 Synthetic paper: It is a flat material that is made by rolling or extruding synthetic resin (such as PP, PE, PS, etc. plastic fiber) and wood pulp and other raw materials, and its composition structure not only retains the appearance of natural fiber paper, but also Whiteness, stiffness, opacity, printability and writing performance, as well as the excellent performance and mechanical properties of polyolefin plastic film, are the high-end new materials for flexible packaging printing in the world market. However, due to the high price, it is difficult to promote the application. 3 Aluminum foil is light-proof, non-toxic, odorless, fresh, high temperature resistance, good barrier properties, recyclable, repeated use, etc., but its low strength, no thermal adhesion, easy to break when folded, only with Plastic film can only make up for its shortcomings after compounding, and is often used to make cooking bags.
3. The cause of white pollution. Plastics are amazingly fast, but they have side effects. Before the 1990s, Chinese enterprises paid attention to recycling and produced recycled plastics, thereby forming a virtuous circle. Less recycled now is the cause of white pollution.
Measures to Solve White Pollution The current solutions to white pollution include the following:
1. Production of degradable plastics: (1) Photo-degradable plastics, so that the polymer carbon chain is decomposed under sunlight ultraviolet irradiation. (2) Biodegradable plastics, which decompose waste plastics using microbial enzymes. 3 Light-biodegradable plastics are double-degradable plastics that are formulated using photodegradable masterbatches and biodegradable masterbatches. Degradable plastic packaging films, such as those produced by Bayer AG, Germany. Another example is the "Jingyuan" brand double degradable plastic produced in Sichuan, which can be used for food packaging and won a gold medal at the 1994 US International Invention and Technology Expo.
2. Refining: Xi'an Xinglong Petrochemical Products Factory successfully developed and used waste plastics to recycle light diesel oil and gasoline. The quality is in line with the standard, the price is lower than the market price, and it does not pollute the environment.
3. Waste plastic recycling: re-stretching and pelletizing to produce recycled plastics.
Nowadays, the rapid development of green food packaging technology has led to the development of diversified, multi-functional, easily degradable, multi-phase composite materials. Food packaging can be not bad for many years, can withstand low temperature -40 °C, high temperature resistance 135 °C, can inhibit heat, light, radioactive electromagnetic waves and other functions.
With the application of physical instruments such as nuclear magnetic resonance and electron microscopy, the crystal structure of the polymer compound can be determined and the crystal structure can be deformed under external force. According to different needs, people can design and synthesize new packaging materials with specified properties (including green food packaging new materials).
Green food packaging must comply with health regulations and standards. In order to protect the health of the people, food packaging and printing materials must fully comply with hygiene standards and do not allow harmful substances to contaminate the packaged food. For example, the export food must be green food and green packaging. The international market has strict health regulations and standards.
1.FDF health regulations and standards. The original intention was the health regulations formulated by the Food and Drug Administration under the US Department of Education and Welfare, and strict regulations were made on the hazardous substances contained in food plastic packaging materials. It has certain authority internationally. Therefore, all countries have referenced the FDF standard when formulating food packaging hygiene regulations.
2. China has formulated food packaging regulations and standards. As early as 1980, China formulated the Hygienic Standards for Polyethylene Molded Products, Hygiene Standards for Polyethylene Resins, Hygienic Standards for Polypropylene Molded Products, Hygienic Standards for Polypropylene Resins for Food Packaging, and Polystyrene Molding. Hygiene Standards for Products and Sanitary Standards for Polystyrene Resins. In 1981, it also enacted the "Hygienic Management Measures for Plastic Products and Raw Materials for Food," "Food Sanitary Management Measures for Food Packaging," and "Hygienic Standards for Food Packaging Paper."
The types and uses of green food packaging Many methods of green food packaging are classified. Divided according to techniques: moisture-proof packaging, waterproof packaging, anti-mildew packaging fresh-keeping packaging, quick-freeze packaging, breathable packaging, microwave sterilization packaging, aseptic packaging, inflatable packaging, vacuum packaging, deoxygenation packaging, blister packaging, body packaging, pull Extension packaging, cooking bag packaging. The above-mentioned various packages are made of different composite materials, and their packaging characteristics correspond to the requirements of different foods and can effectively protect the quality of foods.
Choice of green food packaging materials 1. Selection of green food packaging and printing substrates: 1 It must fully comply with hygiene standards. That is, the substrate itself does not undergo the migration of harmful substances, and it is non-toxic, odorless, and has no odor. 2 must have a certain degree of mechanical strength (such as: tensile strength, tear strength, burst strength, peel strength, etc.), smooth surface, non-absorbent, anti-corrosion and other excellent performance. For example, moisture-proof packaging, vacuum packaging and air-packing of food should have the function of blocking the water vapor in the environment, the penetration of oxygen into the packaging, and preventing the escape of inert gas. Frozen food packaging must have low temperature freeze resistance. For packages containing fats and oils, have oil resistance and UV penetration resistance. For tea preservation and fragrant packaging, composite materials with the best barrier properties should be used.
2. Composite materials are the most important materials for green food packaging. Composite material refers to the compounding of two or more films to form an integrated material. This material overcomes the disadvantages of a single material, maintains the superior properties of the original component, and produces new properties. Composite materials can be broadly divided into structural and functional categories. The composite materials used for packaging and printing belong to the structural type and are composed of a basic material and a reinforcing body. The basic material is a plastic film, and the reinforcement body is composed of an organic fiber material (such as paper) or an inorganic body (such as aluminum foil). There are also basic bodies and reinforcements that are all plastic.
At present, there are more than 500 kinds of composite materials. The development of green food composites has tended to be diverse, multi-functional, and multiphase composites. The nano-composite material (refers to the grain structure and grain boundary of the material reaches the nanoscale size level) and can be said to be the latest technology product.
3. The use of packaging and printing technology is an important part of obtaining green packaging. Flexible packaging printing is a special printing process that refers to flexible packaging materials, that is, a color image replication process. From the color point of view, it needs to go through three stages of color decomposition (color separation), color transfer (level transfer) and color combination. Also includes post-press processing, such as: compounding, slitting, heat sealing, bag making (box) and other processes. In every process, the use of modern new technologies instead of traditional processes is an effective way to ensure the availability of green packaging. For example, electronic color separation and electronic engraving are used to replace the backward photogravure production process to avoid the release of corrosive liquids and endanger the environment. For another example, water type gravure ink is used instead of solvent type gravure ink. Solvent-free dry-type composite process is used instead of solvent-based mode. This solves the problem of solvent evaporation affecting the ecological environment during printing and compounding operations.
Evaluating the Role of Polyolefin Plastics in Packaging Changes and the Impact of Waste After Use on the Environment 1. The Role of Polyolefin Plastics in Packaging Change: Polyethylene in Polyolefin Plastics from the 1950s to the 60s Plastics such as polypropylene and polystyrene have come out one after another. It is processed into a transparent packaging film, which has the advantages of lightness, transparency, non-toxic, tasteless, moisture-proof and oxygen-proof, and acid and alkali resistance. It is recognized by the world that it is the best packaging material for food contact. At that time was known as the "white revolution" of packaging materials. No other packaging material can be substituted until now.
2. The flexible packaging printing materials such as paper and aluminum foil can meet the requirements of modern food packaging only by compounding with plastic films. 1 Paper: The paper used for packaging includes base paper, whiteboard paper, coated paper of 60k or more, offset paper, gravure web, and synthetic paper. Its main advantages are white color, easy shape, easy to print, bright color patterns printed, clear and bright, moderate contrast, vivid image and so on. The main disadvantage is that white paper contains brighteners that are harmful to human body. Strictly speaking, it is not appropriate to directly package foods. The base paper does not contain brighteners, but its color is poor and its surface is rough, so it is rarely used in packaging printing. In order to make up for the lack of white paper packaging performance, often use paper-plastic composite method. 2 Synthetic paper: It is a flat material that is made by rolling or extruding synthetic resin (such as PP, PE, PS, etc. plastic fiber) and wood pulp and other raw materials, and its composition structure not only retains the appearance of natural fiber paper, but also Whiteness, stiffness, opacity, printability and writing performance, as well as the excellent performance and mechanical properties of polyolefin plastic film, are the high-end new materials for flexible packaging printing in the world market. However, due to the high price, it is difficult to promote the application. 3 Aluminum foil is light-proof, non-toxic, odorless, fresh, high temperature resistance, good barrier properties, recyclable, repeated use, etc., but its low strength, no thermal adhesion, easy to break when folded, only with Plastic film can only make up for its shortcomings after compounding, and is often used to make cooking bags.
3. The cause of white pollution. Plastics are amazingly fast, but they have side effects. Before the 1990s, Chinese enterprises paid attention to recycling and produced recycled plastics, thereby forming a virtuous circle. Less recycled now is the cause of white pollution.
Measures to Solve White Pollution The current solutions to white pollution include the following:
1. Production of degradable plastics: (1) Photo-degradable plastics, so that the polymer carbon chain is decomposed under sunlight ultraviolet irradiation. (2) Biodegradable plastics, which decompose waste plastics using microbial enzymes. 3 Light-biodegradable plastics are double-degradable plastics that are formulated using photodegradable masterbatches and biodegradable masterbatches. Degradable plastic packaging films, such as those produced by Bayer AG, Germany. Another example is the "Jingyuan" brand double degradable plastic produced in Sichuan, which can be used for food packaging and won a gold medal at the 1994 US International Invention and Technology Expo.
2. Refining: Xi'an Xinglong Petrochemical Products Factory successfully developed and used waste plastics to recycle light diesel oil and gasoline. The quality is in line with the standard, the price is lower than the market price, and it does not pollute the environment.
3. Waste plastic recycling: re-stretching and pelletizing to produce recycled plastics.
Nowadays, the rapid development of green food packaging technology has led to the development of diversified, multi-functional, easily degradable, multi-phase composite materials. Food packaging can be not bad for many years, can withstand low temperature -40 °C, high temperature resistance 135 °C, can inhibit heat, light, radioactive electromagnetic waves and other functions.
With the application of physical instruments such as nuclear magnetic resonance and electron microscopy, the crystal structure of the polymer compound can be determined and the crystal structure can be deformed under external force. According to different needs, people can design and synthesize new packaging materials with specified properties (including green food packaging new materials).
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