Safety requirements and development trend of the h

Safety requirements and development trend of food packaging

with the development of social economy and the continuous improvement of material living standards, people pay more and more attention to food hygiene and safety. As an important part of food, food packaging is in direct contact with food, and its health and safety are directly related to human health. In order to ensure food safety, the General Administration of quality supervision, inspection and Quarantine of the people's Republic of China (AQSIQ) began to implement filing and statutory inspection of imported and exported food packaging in 2006. Foreign countries have stricter requirements on the safety and quality of food packaging. At present, the United States, the European Union, Japan and other developed countries have formulated corresponding regulations on food packaging and implemented strict market access management

I. food is sometimes mistakenly written as the main safety requirements for cold rolled plate packaging

food packaging materials mainly include polyethylene, polypropylene, polyester, polyamide and other polymer materials. These packaging materials show great differences due to their own molecular structure, molding process and additives. Therefore, it is particularly important for food manufacturers to choose a packaging material suitable for their products, otherwise food safety problems will occur. For example, due to the poor barrier property of the material, the shelf life of liquid milk will be shortened and even deteriorate within a period of time. For the fresh-keeping film, if there is no appropriate amount of air permeability, the freshness of vegetables cannot be guaranteed

in order to keep the food fresh in the circulation process and provide it to consumers safely and healthily, the safety requirements of food packaging mainly include:

(1) solvent residue: packaging molding generally needs to go through blow molding, printing, compounding and other processes. In order to improve the printability and speed, some solvents are generally added. Now, the requirements for odor and potential toxicity are becoming more and more strict, and the national standard stipulates that the solvent residue should be less than 10mg/m2

(2) heavy metal content: heavy metals such as lead, cadmium, mercury, hexavalent chromium, etc. because they and their compounds are highly toxic, and they are a kind of bioaccumulated non degradable substances, which can be accumulated in nature (water, soil, food chain). Once absorbed by humans, humans cannot excrete them through their own metabolism, accumulating over time, When accumulated to a certain amount, it will endanger human health and cause serious consequences such as the decline of human immune function

(3) barrier performance: barrier performance includes gas barrier and water barrier. Most of the reasons for food deterioration are due to the inappropriate barrier performance of the selected materials. The selection of materials should be based on different bags, shelf life, storage conditions and other appropriate barrier materials. GB (standard for plastic composite film and packaging bag for liquid food packaging) issued at the end of 2005 proposed that gb/t1038 (test method for permeability of plastic film) and gb/t1037 (test method for water vapor permeability of plastic film and sheet) be used to test the barrier property of packaging film, and the import and export quality system is more standardized than that of finished products

(4) tensile property: the film is subjected to mechanical tension during packaging and external forces such as extrusion during transportation, which requires that the film must have sufficient tensile strength. For the composite film, it should be ensured that there is no delamination between the film layers, which requires that the composite film has a high peel strength to avoid material delamination

(5) heat sealing performance: problems prone to occur in the production process include missing sealing, false sealing, sealing leakage, sticking to the head, wiredrawing, sealing fracture, poor heat sealing strength, etc. It is worth noting that most filling production lines take a short time from sealing to filling. At this time, the sealing temperature has not yet fallen to room temperature, and the strength is low, which is prone to leakage. Therefore, the prediction of the thermal viscosity strength (sealing strength at high temperature) is particularly important for the whole filling process

(6) ink performance: in addition to the general binding force and wear resistance with the substrate, the requirements of food packaging film on ink should also be able to meet the requirements of sterilization and boiling treatment, as well as freeze resistance and heat resistance, so as to ensure that the ink will not fall off and coagulate during transportation and storage. Many inks contain harmful substances such as benzene

II. Development trend of food packaging materials

in recent years, many food researchers at home and abroad have gradually focused their research on edible packaging films and developed many edible packaging films with different functions, such as edible packaging films of soybean protein, edible packaging films of chitosan, edible packaging films of protein, fatty acid, starch composite, edible packaging films of water-resistant protein, edible packaging paper with soybean residue as raw material Edible packaging container, corn protein packaging film (paper, coating), insect film or protein coated packaging paper (or container), corn starch sodium alginate or chitosan composite packaging film (paper), biological glue coated packaging paper

edible film can be eaten together with its packaged food, which has certain nutritional value. Some can be digested by the human body, and some edible film itself has health care effect on the human body. Moreover, it can be used for small amount of food packaging and monomer food packaging, which can be in direct contact with food to prevent food from being polluted. Some flavoring agents, colorants, nutritional enhancers, etc. can be added in the production of edible film to improve food quality and sensory performance and enhance appetite. And the edible film can be very convenient as a micro packaging material for the influence of food flavoring agents, fermenting agents and edible quality humidity on plastic pigments, and can effectively control the addition of these preparations. 1. The average molecular weight is about 350000 ~ 8million, and its release and stability. Edible film can also be used as a carrier of preservatives and antioxidants to control their diffusion speed into the food on the surface, which is conducive to reducing the amount of these additives. The edible film can also be added to the internal interface of heterogeneous food to prevent the migration of water and solute of food components from causing food deterioration or affecting food quality. Edible film can also be used as packaging film for microwave, baking, fried food, etc. At the same time, edible film, as a degradable film, can still be degraded by microorganisms in the environment if it is not eaten, and will not cause environmental pollution

at present, edible packaging is the main trend of the development of the world food industry. It has been involved in a wide range of application fields, such as casing, fruit wax, sugar coating, glutinous rice paper, ice coating and tablet coating. As edible packaging has various functions, is environmentally friendly, easy to obtain materials, and can be eaten, developed countries have been developing, and new products and technologies continue to emerge, with broad prospects for development. (Luohe entry exit inspection and Quarantine Bureau, Li Hao, Zhao Ning)

reprinted from: nongbo