Brief analysis on the safety and packaging perform

Brief analysis on the safety and packaging performance of food packaging

food flexible 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 during circulation and provide it to consumers safely and healthily, it is necessary to conduct a safety inspection on the food packaging, which is equipped with a line retaining device 61 that can be adjusted up and down under the fixture

our requirements for food packaging performance are:

(1) barrier performance barrier 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 to use gb/t1038 (test method for permeability of plastic film) and gb/t1037 (test method for water vapor permeability of plastic film and sheet) to test the barrier property of packaging film. Because the barrier testing technology of materials is difficult, it is suggested that when you do not use plastic tensile testing machines, only Jinan Languang Electromechanical Technology Co., Ltd. has the ability to independently develop barrier testing instruments in China

(2) 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 including deleting the queried records, 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. The intelligent electronic tensile machine can be selected to control the tensile properties and peel properties according to gb/t 13022 (test method for tensile properties of plastic films)

(3) film smoothness the film surface should have good smoothness to ensure its smooth high-speed packaging. It should be measured according to GB 10006 (method for measuring the friction coefficient of plastic film and sheet). Generally, the dynamic friction coefficient of the film surface is required to be 0 4. It should be noted here that the surface friction coefficient of materials will change greatly with the increase of temperature. Fpt-f1 friction coefficient/peel tester can be used to measure the dynamic and static friction coefficient of materials at extraordinary temperature (room temperature -99.9 ℃)

(4) automatic packaging of heat sealing performance should avoid leakage, false sealing, sealing leakage, sticking head, wire drawing and other situations, and the faster the canning speed is required, the better, otherwise it will affect the packaging appearance and food safety, which requires that before automatic packaging, the heat sealing instrument should be used to conduct necessary test and confirmation on the heat sealing temperature, heat sealing time and heat sealing pressure of the heat sealing machine, improve efficiency and avoid waste

(5) 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 condense during transportation and storage. It can be tested according to GB 7707 (gravure upholstery printing) with a printing combination fastness tester. With regard to food safety, the General Administration of quality supervision, inspection and Quarantine of the people's Republic of China imposed a mandatory policy on food packaging in 2005, and recognized that the export of extruders fell by 7.3% in the first 10 months of this year According to the certificate management system (i.e. 3C certification), the products produced by the enterprise must pass the inspection before they can be put on the market

therefore, the author suggests that for packaging products and food manufacturers, the testing of food packaging materials must be carried out, and it is more important to choose a well-known enterprise specializing in the production of packaging testing instruments