Greening of the hottest high-performance functiona

Greening of high-performance functional packaging materials (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, functional packages represented by barrier property, freshness, heat resistance, edible property, decomposability, nano packaging materials, etc. for example, if you only need 5kg of tension, you need 200kg of tension, so the test results are certainly inaccurate. Because the difference is too far, this does not mean that the test cannot be done, it can be done, but the test results are inaccurate If customers have high requirements, they will generally choose servo tensile testing machine. The test results are relatively accurate because of the high accuracy. If customers have no requirements, they will generally choose ordinary tensile testing machine, which is only for those products with low requirements The emergence of packaging materials promotes 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

according to the traditional material classification method, 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. 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, and absorbent packaging materials. 3. Performance description: barrier packaging materials, heat-resistant packaging materials, sterile and antibacterial packaging materials, Conductive packaging materials 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 a 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 methods of additives, acid-base treatment, enzyme treatment or oxidation treatment, the edible packaging materials of starch food can be started from one production line. The materials can be divided into edible packaging paper with soybean dregs as raw materials and corn starch, sodium alginate or glycan in line with the 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

(to be continued)