Analysis of the influence of packaging on food safety and quality control measures from the new food safety law

Food safety is closely related to people's livelihood In recent years, "melamine", "Clenbuterol", "Sudan" and other safety accidents occur frequently, and food safety has become an important issue that the government and the people can not avoid For this long-term problem, which involves a wide range and is complex, the government launched a heavy attack in 2015 and passed the revised draft of the food safety law The food safety law known as "Zui strictness" was officially implemented on October 1, 2015 The revised food safety law establishes Zui as a strict management process, traceability mechanism and punishment system for food production and operation, and strengthens the safety responsibility of enterprise subjects, including the third-party platform for online food trading The criminal responsibility for the acts that constitute a crime is investigated according to law, and the accountability of local government leaders and supervisors is strengthened Throughout the food production process, packaging is not only the barrier between food and the outside world, but also the post Zui checkpoint of food safety If there are quality problems, food safety will become a mere empty talk It can be seen that packaging plays an important role in food safety Carefully read the food safety law, in which Article 34 "prohibit the production and operation of food and food additives polluted by packaging materials, containers, means of transport" and Article 46 "control from production process, equipment, storage, packaging and other key production links to ensure the production of food compound food safety standards" all put forward quality control requirements from the perspective of food packaging Now the influence and quality control methods are analyzed in detail 　　 There are more and more varieties of food, and the corresponding food packaging materials are different, such as plastic film, plastic composite film, paper plastic composite film, CO extrusion film, aluminum coating film, aluminum foil, aluminum foil composite film and other films, as well as packaging containers of different shapes, of which plastic packaging materials account for more than 90% of all food packaging materials, and its material, performance and technology are important factors affecting food safety The influence of additives in the production of plastic packaging materials on food safety Article 41 of the newly revised food safety law requires that the production license shall be implemented in accordance with the provisions of the state on the administration of production license of industrial products for food related products with high risk, such as packaging materials directly contacting with food It is not unreasonable for the safety law to focus on the packaging materials that directly contact with food, because additives such as antioxidants, stabilizers, plasticizers and diluents will be added in the processing of food contact materials such as plastics, rubber, paper, metals and coatings to meet the needs of various packaging In the process of contact with food, especially oil or acid food, the molecules migrate into food through materials, which affects the safety of food and poses a threat to human health In this regard, the state has formulated relevant standards to regulate the amount and detection methods of the migration of plastic packaging into food, such as GB9685-2008 hygienic standard for the use of additives for food containers and packaging materials, gb9683-88 hygienic standard for composite food packaging bags, gb4805-1994 hygienic standard for epoxy phenolic coating on the inner wall of food cans, etc In the standard, evaporation residue is used to measure the leachables of packaging materials Evaporation residue is an indicator to detect the quality of chemical substances that may be separated out when food contact materials contact with water, acid substances, alcohol, oil and other foods in the process of use, that is, evaporation residue indicator is used to assess the total amount of various substances in the packaging migrating to food within a certain period of time, expressed in mg/L The simulant is usually distilled water, 4% acetic acid, 20% or 65% ethanol and n-hexane Compared with the random errors that are easy to appear in the manual test, it is suggested to adopt the instrument automatic test method, such as ert-01 evaporation residue constant weight instrument, which can reduce the human intervention in the drying, drying, weighing and other test process, and ensure that the sample weight test process has been in a relatively stable environment, avoiding the impact of the test environment on the test results Influence of adhesive and printing ink used in plastic composite packaging materials on food safety On the one hand, the adhesive used for composite packaging materials will crack at high temperature to generate toxic and harmful substances; on the other hand, some bad suppliers will add toluene or xylene harmful substances to the solvent in the adhesive, which increases the risk of cancer of the packaged food In addition, polyester resin is the main structure of printing ink used in domestic packaging and printing industry, toluene and butanone are the main solvents, and solvent evaporation is the drying method Due to the different evaporation rates of toluene, butanone, ethyl ester and other solvents contained in adhesives and inks, the values of various solvent residues are different At the same time, if the solvent has good solubility to the resin molecule, the release of the resin molecule to the solvent is poor, which will also lead to a large number of solvent residues On this basis, with the increase of the coating thickness of adhesive and ink layer, the solvent residue will also increase When the residual amount of solvent exceeds a certain limit, it will move inward and outward at the same time If it enters the package content, it will cause pollution, and then it will bring harm to the health of consumers The state has made strict requirements for the solvent residue index of food composite packaging: (1) the total residue, including 11 kinds of ethanol, acetone, isopropyl acetate, butanone, ethyl acetate, butanol, isopropyl acetate, butyl acetate, benzene, toluene, xylene, etc (2) Benzene solvent residues, including benzene, toluene, xylene, etc GB / t10004-2008 plastic composite film, bag dry composite and extrusion composite for packaging requires that the total amount of residues shall be ≤ 5.0mg/m2, benzene solvent shall not be detected, and the detection limit is 0.01mg/m2 As the solvent residue of composite packaging is generally produced in ink, solvent and adhesive, which is closely related to the film itself, production process and environment, it is difficult for enterprises to comprehensively control, so the detection of solvent residue of composite packaging is particularly important According to the test data, the relevant enterprises can adjust the production materials and processes to reduce the probability of solvent exceeding the standard The influence of physical and mechanical properties of packaging materials and packaging sealing problems on food safety packaging materials are the matrix of packaging containers The application of these materials in food packaging needs to have good characteristics in thickness, barrier and mechanical properties Thickness is a basic item of all properties To keep the thickness of packaging materials uniform, in addition to helping dairy enterprises to save production costs, at the same time, it is suitable to control the uniform performance of all parts of the packaging materials There are many kinds of thickness measurement methods According to the current international and domestic standards, surface contact thickness measurement is the designated thickness measurement method In addition, the mechanical properties of packaging materials are also the basic factors related to the important performance of food packaging load-bearing and impact resistance, including tensile strength, elongation at break, peel force, tear performance, etc the test methods are available and relatively mature, so they will be included in the food packaging quality control system for daily monitoring Barrier property refers to the performance of packaging materials to block water vapor and gas penetration As we all know, water and oxygen are the main factors that lead to food deterioration, so packaging materials, as the isolation materials between food and the external environment, have very high barrier requirements Due to the high precision and accuracy of this test, the daily test mostly depends on the laboratory testing instruments, and then the laboratory personnel guide the different types of food packaging materials according to the barrier differences In addition to water vapor and oxygen entering through packaging materials, the leakage of packaging is also the weak link of its penetration In view of this content, first of all, it is necessary to confirm the distribution of the leakage part of the package, and it is recommended to use the negative pressure method for the sealing test The test steps can refer to GB / 15171 test method for sealing performance of soft package Secondly, according to the test results to find out the leakage prone parts, generally speaking, sealing leakage is more common Most modern enterprises adopt heat sealing technology The time, temperature and pressure of heat sealing are the three technical indexes that determine the effect of heat sealing With the help of heat sealing tester and other related testing instruments, different technical parameters are tested under the simulated production line environment, so as to find out the Zui excellent heat sealing process and improve the sealing quality In conclusion, the impact of packaging materials on food safety is potential, but it happens all the time The birth of the new food safety law, on the one hand, indicates that China's food safety mechanism has entered a new stage, on the other hand, it also drives the quality control of packaging materials into a more strict era, to protect food safety!