Analysis of functional packaging materials in the

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Analysis of functional packaging materials in Packaging Engineering (Part I)

Abstract: packaging materials occupy a very important position in the material industry. The value of packaging industry in developed countries has accounted for more than 2% of gross domestic product (GDP). In recent years, the emergence of functional packaging materials represented by barrier, fresh-keeping, heat resistance, edible, decomposability, nano packaging materials, etc., has promoted the rapid development of the packaging industry. Key words: packaging engineering functional materials barrier packaging materials freshness preservation packaging materials selection absorbent packaging materials heat resistance packaging materials edible packaging materials decomposition packaging materials nano packaging materials

packaging materials occupy a very important position in the material industry. The value of packaging industry in developed countries has accounted for more than 2% of gross domestic product (GDP). At present, China also consumes a lot of commodity packaging every year. In recent years, with the improvement of people's living standards, especially people's degree of environmental protection has been paid more and more attention, so there are higher requirements for packaging, and the voice of green packaging is getting higher and higher. Therefore, it has promoted the rapid development of material science in the direction of packaging materials, and as the basic industry of the packaging industry, it has driven the take-off of the packaging industry. When the distance between the two chucks changes, the packaging materials can be divided into paper materials, synthetic polymer materials, metal materials, glass and ceramic materials, composite materials, fiber materials, wood and other materials according to the traditional material classification method. However, with the development of material science, especially the continuous emergence of new materials, functional materials have emerged in the packaging industry. According to the concept of functional packaging materials, functional packaging materials include: edible packaging materials, degradable packaging materials, fresh-keeping packaging materials, selection of absorbent packaging materials, barrier packaging materials, heat-resistant packaging materials, sterile and antibacterial packaging materials, Conductive packaging materials can minimize virus contamination and nano packaging materials

edible packaging materials

with the continuous development and utilization of high technology in the field of food packaging, various edible packaging materials have come out one after another. These edible packaging materials are generally based on natural edible substances that can be absorbed and digested by the human body, such as protein, starch, polysaccharide, plant fiber and other natural substances. Through the interaction between different molecules, they are made into porous network structures, Packaging film that does not affect food flavor. Edible film is rich in raw materials, can be used, harmless to human body, and has certain strength. As a functional material in the packaging industry, it has achieved rapid development in recent years and is widely used in the packaging of food and medicine

as a packaging film, edible packaging film has the following characteristics: water resistance, which can delay the migration and nuclear diffusion of water, oil and other components in food; Selectable air permeability and anti permeability to prevent the volatilization of flavor substances in food; It has good physical and mechanical properties and good surface mechanical strength, which is convenient for processing and molding; It can be used as the carrier of food additives such as color, aroma, taste, nutrient fortification and antioxidant substances; Edible, no pollution to the environment... And other excellent characteristics

at present, edible packaging materials are mainly protein, starch, chitin and other natural raw materials

edible packaging materials made of protein are divided into animal protein and plant protein. Animal protein is derived from animal skin, bone, cartilage tissue, etc. This kind of material has good strength, water resistance and oxygen permeability, and is suitable for the packaging of meat food. For example, an edible packaging film prepared from an animal protein glue raw material has the properties of high strength, water resistance and isolation from water vapor. Thawing cooking will melt automatically and can be used to package oil food without changing the flavor of the food

edible packaging film made of plant protein has good moisture resistance and certain antioxidant properties. It is suitable for the packaging of fatty food, which can maintain moisture and ensure that the original taste of food remains unchanged. At present, it mainly includes edible packaging film of soybean protein, edible packaging film of protein, fatty acid, starch, water-resistant protein film, edible packaging film of zein, protein coated packaging paper, etc. In addition, there are some alternative edible packaging films, such as milk protein, casein, etc

use the protein extracted from soybeans to produce plastic like substances as edible packaging materials to replace the plastic synthesized from oil in the past. This production technology is to soak soybeans, then sort out proteins with ink, dry the proteins easily, remove the moisture in them, and then mix protein powder with other components and additives to make edible packaging film or coating, which is used to package food. It has excellent strength, elasticity and moisture resistance

corn protein packaging film is mainly used for the packaging coating of fast food boxes. This film is a synthetic material of paper and corn protein. Boiling in the pot does not change its properties. A newly developed edible protein film with antibacterial function is to add lysozyme or vitamins to zein or soybean protein single film, which can control the growth of pathogenic bacteria in food and food deterioration caused by microorganisms

among the edible packaging materials based on corn, wheat, potatoes, duri, potatoes and other crops, the edible packaging film modified by corn starch is the most typical. According to the different additives, acid-base treatment, experimental mechanism of spring torque at the enzyme or oxidation treatment methods, edible packaging materials for starch foods can be divided into edible packaging paper with soybean dregs as raw materials and corn starch, sodium alginate or glycan conforming packaging film, etc. Using starch as raw material and adding some other edible substances, it is processed into packaging paper for packaging fast-food noodles, condiments, etc. it can be directly put into the pot for cooking without removing the packaging bag, which has the dual effects of environmental protection and conservation

high barrier plastic packaging materials

high barrier plastic packaging materials have developed with the rapid development of the food industry, and have been rapidly developed and widely used in the packaging industry, especially in the food packaging industry. It plays a role in ensuring the quality, freshness, flavor and prolonging the shelf life of food. There are various technologies for preserving food, such as vacuum packaging, gas replacement packaging, sealed deoxidizer packaging, food drying packaging, sterile filling packaging, cooking packaging, liquid heat filling packaging, and so on. Many of these packaging technologies use plastic packaging materials. Although they are required to have a variety of properties, it is important to have good barrier properties. In the packaging industry, the more common high barrier film materials are as follows:

nylon packaging materials. Nylon packaging materials used to use "nylon 6". But the air tightness of "nylon 6" is not ideal. There is a nylon (mkd6) polycondensated from m-dimethylamine and adipic acid. Its air tightness is 10 times higher than that of "nylon 6". At the same time, it also has good transparency and cracking resistance. It is mainly used for high barrier packaging film and soft food packaging with high barrier requirements. Its food hygiene has also been approved by FDA. As a film, its greatest feature is that its barrier property does not decrease with the rise of humidity. In Europe, as a substitute for PVDC films, MXD6 nylon is used in a large amount due to outstanding environmental protection problems. A new film with bi-directional extensibility, which is compounded by MXD6 nylon and EVOH, is a nylon film with high barrier. The methods of compounding include multilayer compounding and blending and stretching MXD6 nylon and EVOH

pvdc materials (polyvinylidene chloride). Polyvinylidene chloride (PVDC) resin, as a composite or monomer material and coextrusion film, is the most used high barrier packaging material in the packaging industry. Among them, PVDC coating film is the most used. PVDC coating film uses polypropylene (OPP), polyethylene terephthalate (PET) and other materials as substrates. However, due to the high softening temperature of pure PVDC, which is close to its decomposition temperature, and poor compatibility with general plasticizers, it is difficult to heat up and apply directly. The PVDC films actually used are mostly copolymers of vinylidene chloride (VDC) and vinyl chloride (VC), and films with good barrier properties made by copolymerization with methyl acrylate (MA)

evoh materials. EVOH has been the most widely used high barrier material. In addition to the non stretching type, the film type of this material also includes biaxial stretching type, aluminum evaporation type, adhesive coating type, etc. Biaxial stretching type and heat-resistant type are used for sterile packaging products. The film produced by CO extrusion of eboh resin with polyolefin, nylon and other resins is mainly used for the packaging of livestock products

in recent years, the voice of the international community for green packaging has become higher and higher, but the waste of PVDC, which is widely used as a high barrier packaging material, will produce HCI during combustion treatment, resulting in environmental pollution problems. Therefore, there is a trend to be replaced by other packaging materials. For example, the so-called coating film made after SiOx (silicon oxide) is plated on the film of other substrates has received attention. In addition to the silicon oxide coating, there is also the aluminum oxide evaporation film, whose air tightness is the same as that of the silicon oxide coating obtained by the same method. At the same time, due to the rapid development of multilayer composite, blending, copolymerization and evaporation technology, High barrier packaging materials, such as the founder of BFF, still do not change its original intention: "we just want to produce valuable products that meet normal quality standards from worthless garbage, copolymers EVOH, polyvinylidene chloride (PVDC), polyamine (PA), polyethylene terephthalate (PET) The multi-layer composite materials and silicon oxide evaporated films have been further developed, especially the following products: MXD6 polyamide packaging materials, polyethylene naphthalate (pen), silicon oxide evaporated films, etc

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