Abstract: The small molecular substances contained in the packaging bag are at risk of easy migration into the contents of the package. Vinegar process herein to detect sample bag evaporation residue content of an example, the volatile matter content Africa small molecules for testing flexible plastic packaging test methods and test equipment, with the sensing device and the evaporation residue ERT-01 The equipment parameters and applicable range of the constant weight meter are introduced to provide reference for the enterprise to detect the evaporation residue.
Key words: vinegar, packaging bags, soft plastic packaging, evaporation residue, non-volatile small molecular substances, evaporation residue constant weight instrument, migration
1 , meaning
In the production process of soft plastic packaging, in order to improve the packaging performance, some additives are usually introduced into it, such as antioxidants, lubricants, antistatic agents, plasticizers, etc., in addition, the resin raw materials used for the production of packaging, printing The ink used, the adhesive used in the composite film and the like are all easy to introduce small molecular substances into the soft plastic packaging. During the long-term contact between the soft plastic package and the packaged contents, these small molecular substances are easily migrated into the contents, contaminating the contents, especially in environmental conditions such as high acidity and high oil content. It will speed up and pose a serious threat to the health of consumers or users. Therefore, strengthening the monitoring of the migration content of small molecular substances in soft plastic packaging is an effective measure to improve the safety and non-toxicity of product use.
2 , the status quo
At present, the soluble amount of small molecular substances in domestic soft plastic packaging is mainly characterized by evaporation residue index. The basic test procedure for the evaporation residue test is to replace the contents of the package with the soaking solution, simulate the migration process of small molecules in the soft plastic package, and then analyze the weight of the material that migrates into the soaking solution. The detection of sample evaporation residue in this paper is the reference test standard GB/T 5009.60-2003 "Analysis method for hygienic standard of polyethylene, polystyrene and polypropylene molded products for food packaging" .
3 , test samples
The packaging form of vinegar mainly includes plastic bottles, glass bottles, soft plastic bags and the like. In this paper, a black and white film bag for vinegar packaging is used as a test sample, and according to the acidity of vinegar, 4% acetic acid is selected as the test soaking liquid.
Figure 1 Common vinegar packaging
4 , test equipment
In this paper , the evaporation residue of the sample was tested by the ERT-01 evaporation residue constant weight instrument independently developed by Jinan Languang Electromechanical Technology Co., Ltd.
Figure 2 ERT-01 evaporation residue constant weight meter
4.1 Test principle
After soaking the sample with the soaking solution, the soaking liquid is evaporated to dryness in a water bath, and then placed in a constant weight in the evaporation residue meter, and the soaking liquid of the unsoaked sample is treated in the same manner as a blank test, the sample liquid The difference in mass after evaporating the constant weight with the blank liquid is the evaporation residue of the sample.
4.2 Scope of application
(1) This equipment is suitable for testing the evaporation residue of various food packaging devices and containers, such as packaging made of polyethylene, polypropylene, polystyrene, polyethylene terephthalate, nylon, etc. Containers, soft plastic bags, etc., natural rubber as the main raw material for gaskets and gaskets for bottled and canned foods, inner wall coatings with perchloroethylene resin as the main raw material, food canned inner wall epoxy phenolic paint, plants A food container in which fiber pulp is used as a raw material.
(2) This equipment is suitable for the evaporation residue test of reagent samples which can be volatilized at the boiling water bath temperature and remove the main chemical reagent.
(3) This equipment can meet a number of national standards, such as GB/T 5009.60 , GB/T 5009.64 , GB/T 5009.68 , GB/T 5009.69 , GB/T 5009.203 , GB/T 9740 and so on.
4.3 Equipment parameters
- The evaporation residue has a test range of 0 to 80 g and a test accuracy of 0.3 mg .
- The normal temperature control range is 100 ~ 130 °C , and the temperature control accuracy is ±0.2 °C .
- The independent test of the single machine 8 sample and the fully automatic weighing and constant weight test process greatly improve the detection efficiency.
- The equipment can be weighed directly under high temperature conditions to avoid the influence of human factors and further the accuracy of the packaging test results.
- Support Lystem TM laboratory data sharing system, easy to achieve centralized and systematic management of laboratory test data.
5 , the test process
(1) measuring the surface area of the test sample bags black and white vinegar, a glass sample was then placed in the appliance, the corresponding volume of added acetic acid 4% the surface area of the sample according to glassware after the sealed glassware placed deg.] C to 60 In a water bath, allow the sample to soak for 2 h at this temperature .
(2) The evaporating dish is placed on the corresponding numbered tray in the test chamber of the evaporation residue constant weight meter according to the number, and the weight of the empty evaporating dish is tested.
(3) Take 200 mL of 4% acetic acid blank solution into the weighed fixed number of evaporating dish, remove 200 mL of soaking solution into the other numbered evaporating dish, and place each evaporating dish. It was evaporated to dryness in a water bath at 100 ± 5 °C .
(4) The dish was placed in an evaporator to dryness the evaporation residue corresponding to constant weight meter test chamber tray number is provided weighing interval time, drying temperature, the difference in weight, with reference to the cup (i.e., the evaporating dish containing the blank solution) Number The parameter information such as the test cup number is used to start the test, and the device performs constant weight according to the set parameters.
(5) When the weight difference between the two weighings after the evaporating dish is lower than the set value, the test is stopped and the device automatically calculates and displays the test result.
6 , test results
The average evaporation residue of the black and white film bag samples for vinegar packaging in this test was 5.69 mg/L .
7 , conclusion
Evaporation residue is a physical indicator that characterizes the content of soluble small molecules in the packaged samples. It is an important performance indicator that reflects the safe use of packaging equipment. ERT-01 Evaporation Residue Constant Weight Instrument is a professional testing equipment for evaporation residue testing. This equipment overcomes the cumbersome process of artificial constant weight. The testing process is highly automated, avoiding the influence of human factors on the test results. It has higher accuracy and better repeatability. It can test 8 samples in one test and can directly weigh without drying and cooling. The test efficiency is higher. Labthink is committed to providing professional, advanced and high-end packaging testing equipment and testing services to customers around the world. The testing equipment and services provided include pharmaceutical packaging, food packaging, daily packaging, printing, adhesives, automobiles, For petrochemical, biological, construction and new energy industries, you can find out the relevant testing equipment. You can visit Jinan Languang Company for specific information or call us . The more you understand, the more you trust! Jinan Languang Electromechanical Technology Co., Ltd. is willing to enhance technical exchanges and cooperation with enterprises and institutions in the industry.
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