Abstract: When rubber, plastic and other products come into contact with food and medicine, the harmful transportable substances contained in the products will slowly migrate to the products they are in contact with. In this paper, the baby pacifier is taken as an example. The Labthink ERT-01 evaporative residue constant weight meter is used to test the total migration of the migratory substances in the nipple, and the test principle, equipment parameters, scope of use, and test procedure are simple. Introduction, providing reference for enterprises to monitor the total amount of migrable substances in rubber, plastics and other products.
Key words: evaporation residue, transportable matter, total migration, evaporation residue, heavy weight meter, rubber products, plastic products, nipple
1, meaning
In the production process of rubber, plastic and other products, in order to prolong the service life of the product, and have good properties such as oxidation resistance, smoothness and flexibility, additives such as antioxidants, anti-blocking agents and plasticizers are often mixed. In addition to this, it is difficult for the monomers used to prepare the product to completely react. Experiments have shown that these additives and residual monomers will slowly migrate outward in rubber, plastics and other products. When rubber and plastic products are in direct contact with food or medicine in packaging or other forms, these substances are likely to migrate. In foods and medicines, food safety incidents such as "white wine plasticizer event" and "toxic plastic wrap film incident" are related to the migration of harmful substances in packaging. Therefore, it is necessary to strengthen direct contact with rubber and plastics, such as food and medicine. Monitoring of transportable materials in products. Most of the pacifiers are used by babies, and they are in direct contact with the milk powder and oral cavity. The function of the various organs of the babies is not perfect. The more migrating substances in the nipples are more harmful to the babies. Therefore, the migrating substances in the nipples should be increased. The total amount is controlled to ensure the safety of the baby's entrance food.
Figure 1 pacifier
2, test samples
This test used a brand of baby pacifier as a test sample.
3. Test basis
This test is based on GB 31604.8-2016 "Food Safety National Food Contact Materials and Determination of Total Migration of Food Products" mentioned in the national standard GB 4806.2-2015 "Food Safety National Standard Pacifier".
4, test equipment
In this test, the ERT-01 Evaporation Residue Constant Weight Instrument was used as the test equipment. The equipment was independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd.
Figure 2 ERT-01 evaporation residue constant weight meter
4.1 Principle of the test
The total migration test is mainly divided into two parts: the migration process and the weighing process. The migration process is to soak the sample to be tested with the soaking liquid with similar food characteristics, and determine the migration according to the time and temperature of the sample to be tested. The time and temperature of the test, in order to simulate the migration process of the migratory substance in the process of contact with the food sample; after the migration test, the soaking liquid is evaporated, dried, weighed, and the weight of the residue in the soaking liquid is deducted. The weight of the residue in the reagent is the total amount of migration of the sample to be tested.
4.2 Equipment parameters
Can test 0 ~ 80 g residue quality, test accuracy 0.3 mg;
Temperature control range is 100 ~ 130 °C, temperature control accuracy is ± 0.2 °C;
The hot air circulation wind speed is 0.2 m/s, and the sample volume is 0 ~ 200 mL;
Independent testing of eight samples of a single machine and automatic test process greatly improve the detection efficiency;
Adopt automatic lifting mechanism design and intermittent weighing measurement method to effectively reduce system error;
Test chamber hot air circulation system, unique design for automatic temperature control and moisture removal;
Weighing can be carried out directly under high temperature conditions to avoid the influence of human factors and ensure the accuracy of test results;
Three test modes: proportional, fuzzy and difference, to meet different test needs of users;
With the user-friendly operating interface and intelligent data processing functions, it can be connected to the LystemTM laboratory data sharing system to manage test results and test reports.
4.3 Scope of application
(1) It is suitable for testing the properties of packaging films, container evaporation residues, non-volatile content, etc. of foods, utensils, pharmaceuticals, etc. made of polyethylene, polypropylene, polystyrene, etc.
(2) It is applicable to the testing of evaporation residue of gaskets, gaskets, etc., which are made of natural rubber as the main raw material for sealing of bottled and canned foods, such as various juice drinks, wines, seasonings, etc.
(3) It is suitable for the evaporation residue test of food containers, container interior coatings, coating iron sheets, plant fiber food containers and other materials with perchloroethylene resin as the main raw material in direct contact with food.
(4) Applicable to the evaporation residue test of chemical reagents which can be volatilized at the boiling water bath temperature and removed from the main body.
(5) The instrument meets a variety of national standards, such as GB 31604.8-2016, GB/T 5009.60-2003, GB/T 5009.64-2003, GB/T 5009.68-2003, GB/T 5009.69-2008, GB/T 5009.203- 2003, GB/T 9740-2008, etc.
5, the test process
Migration process
The amount of material that migrates varies depending on the soaking solution selected. The nipple is contacted with non-acid foods with an aqueous content and an ethanol content of less than 10%. Therefore, the soaking liquid selected in this test is distilled water.
To the sample to be tested, distilled water of 40 ° C was added, and the sample to be tested containing distilled water was allowed to stand in an environment of 40 ° C for 24 hours while performing a blank test.
Weighing process
(1) Take the soaking solution and the blank reagent in a constant weight evaporating dish and evaporate to dryness.
(2) Transfer the evaporating dish to the pallet rack of the corresponding number in the evaporation residue constant weight meter, set the parameter information such as drying time and drying temperature, click the test option, and the test starts.
(3) After the test is over, the device automatically displays the test results.
6, test results
The total migration in the pacifier samples tested was 3.1 mg/kg.
7. Conclusion
The total migration of migratory substances in rubber and plastic products directly in contact with foods and medicines is one of the important performances affecting the safety of their use. Strictly control and strengthen the monitoring of total migration to improve product quality and prevent pollution. Food and medicine are of great significance. The ERT-01 Evaporation Residue Constant Weight Instrument has the advantages of accurate test, high intelligence and convenient use in detecting total migration. Labthink is a high-tech enterprise specializing in R&D, production and packaging inspection services for packaging inspection equipment. Currently, the existing testing equipment includes gas permeability tester, oxygen transmission rate tester and water vapor transmission rate tester. , intelligent electronic tensile testing machine, friction coefficient tester, heat shrink tester, seal tester, heat seal tester, head air analyzer, etc., and a variety of test instruments involving packaging full-scale performance test, to understand the detailed information of related equipment, You can log in to view. The more you understand, the more trust! Jinan Languang Electromechanical Technology Co., Ltd. is looking forward to enhancing technical exchanges and cooperation with enterprises and institutions in the industry!
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