Abstract: Oxygen barrier performance is one of the basic properties that cosmetic packaging should have. This property can prevent cosmetics from deteriorating and mold during storage. In this paper, a test method for the oxygen transmission capacity of a certain brand of plastic bottle for emulsion cosmetic packaging is introduced, and a test method for the oxygen barrier performance of the packaging container is introduced. The relevant experimental principles, test procedures, and test equipment used are described—OX2/230. Oxygen transmission rate test system equipment parameters and scope of application, etc., for the enterprise to monitor the cosmetic packaging containers for oxygen resistance to provide reference.
Keywords: plastic bottles, oxygen transmission rate, oxygen permeation, oxygen barrier performance, cosmetics, oxygen permeability test system
1, the meaning
Cosmetics common packaging forms include plastic bottles, hoses, glass bottles, soft plastic bags. In order to ensure the functional requirements of cosmetics, raw materials used in different cosmetics are different, but in general, raw materials for cosmetics are divided into matrix raw materials and auxiliary raw materials according to different performance and functions. Oily raw materials are a major raw material for the matrix. Some components of the raw materials contain unsaturated bonds, such as olive oil, which are easily oxidized and rancid in the oxygen, light, and temperature conditions. , produce odor, discoloration and so on. In addition, if certain cosmetics are produced, used, or stored improperly, they can easily grow microbes and become moldy. Therefore, the packaging materials used in cosmetics should have good oxygen barrier properties and be able to block light, thereby reducing the amount of oxygen in contact with cosmetics and avoiding sunlight. This article examines the oxygen barrier properties of cosmetic packaging by testing its oxygen transmission rate.
Figure 1 Cosmetics common packaging
2, test sample
A brand of plastic bottles for latex cosmetic packaging.
3, test basis
Oxygen transmission rate of packaging materials is mainly measured by differential pressure method and isobaric method. For container packaging, the technique of testing the oxygen transmission rate by equal pressure method is quite mature, and the differential pressure method is still under development. This article uses the equal pressure method to test the oxygen barrier performance of the sample. The test is based on the GB/T 31354-2014 Coupon Test Method for Package and Container Permeability Test.
4, test equipment
The test equipment used in this test is the OX2/230 oxygen transmission rate test system, which is independently developed by Jinan Languang Electromechanical Technology Co., Ltd.
Figure 2 OX2/230 oxygen transmission rate tester
4.1 Test principle
The isostatic method principle, also known as coulomb metering, refers to the method in which the pressure on both sides of the specimen is kept constant during the test, and a method of measuring the amount of oxygen permeating the specimen through the Coulomb sensor is used. When testing the container type sample, the outside of the sample is oxygen with a certain pressure. The inlet and outlet pipes inserted inside the sample are connected with the equipment. The high purity nitrogen gas is introduced into the sample from the inlet pipe, and the concentration of oxygen is poor. Under the action of the sample, the outside of the sample penetrates through the sample into the inside of the sample and is carried from the outlet pipe by nitrogen gas to the sensor inside the device for analysis, thereby obtaining the oxygen permeability of the sample.
4.2 Application
(1) This equipment is suitable for oxygen permeability test of containers, films, sheets and other samples. Among them, containers include pipes, bottles, bags, cans, boxes, barrels, etc. made of plastic, rubber, paper, paper-plastic composite, glass, metal, etc., such as medicinal ointment aluminum tubes, coke bottles, peanut oil barrels, Tetra Pak Packaging, vacuum packaging bags, metal three cans, plastic cosmetics packaging, toothpaste hoses, jelly cups, yogurt cups, etc.; films include a variety of plastic cover film, plastic composite film, paper-plastic composite film, aluminized film, aluminum foil, etc. Membrane materials; sheet materials include various engineering plastics, rubber, building materials and other sheet materials, such as PP sheet, PVC sheet, PVDC sheet and so on.
(2) Meet many national and international standards such as GB/T 31354, ISO 15105-2, GB/T 19789, ASTM D3985, ASTM F2622, ASTM F1307, ASTM F1927, JIS K7126-2, YBB 00082003, etc.
4.3 Equipment Parameters
The test range for container samples is 0.0001 to 60 cm3/(pkg·d) with a resolution of 0.00001 cm3/(pkg·d); the test range for film samples is 0.01 to 6500 cm3/(m2·d). Scalable test range is 0.07 ~ 65000 cm3/(m2·d), resolution is 0.001 cm3/(m2·d); test temperature control range is 15 ~ 55°C, accuracy is ±0.1°C; humidity control range is 0%RH, 35 %RH ~ 90%RH, Accuracy ±1%RH; Wide-range, high-precision temperature and humidity control range, both sides of the sample can be humidified, to achieve the test under different conditions of temperature and humidity; three test chambers are Independent test can be carried out without interfering with the test process and the test results can be displayed independently. The system can support up to 10 instruments in parallel and establish an efficient system for simultaneous testing of 30 samples. It can be used with a water vapor transmission rate test system to form a mix. The test system is controlled by a single computer to achieve an efficient and convenient test method for the simultaneous measurement of the oxygen and water vapor transmission rates. It supports the LystemTM laboratory data sharing system and manages the test results and test reports.
5, the test process
5.1 sealed sample
Seal the mouth of the specimen with special glue on the special pallet for container materials. Care should be taken to ensure that the seal between the specimen and the tray is good, which is an important step that affects the accuracy of the test results.
5.2 clamp sample
Connect the inlet and outlet pipes of the tray rack with the inlet and outlet holes of the equipment, and cover and seal the sample and tray with aluminum foil bags.
5.3 Setting parameters
Set parameter information such as sample name, test temperature, humidity, and test mode.
5.4 Start the test
Click on the test option and the test begins. Start the air supply, adjust the humidity and carrier gas flow, and the device displays the measured amount of oxygen in real time.
5.5 End of test
After the test is completed, the equipment automatically calculates and displays the test results based on the amount of oxygen tested.
6, test results
The oxygen permeability of a certain brand of plastic bottles for cosmetic packaging used in this test was 0.1037 cm3/(pkg·d).
7. Conclusion
Enhancing the barrier properties of packaging materials to oxygen is an effective way to prevent cosmetic ingredients from being oxidized and moldy. This article tested the oxygen permeability of cosmetics plastic bottle packaging using the principle of isobaric testing. The test procedure is simple and the equipment is easy to operate. One test can be performed. Testing 3 identical or different samples, the test efficiency is improved, the test results are of high accuracy, good accuracy, and can truly reflect the oxygen barrier performance of the tested samples. Jinan Languang Electromechanical Technology Co., Ltd. is a high-tech enterprise specializing in the R&D and production of packaging testing equipment. At present, the existing equipment can test the oxygen permeability, water vapor transmission, stacking test, and compressive strength of cosmetic packaging materials. Sealing performance, rotating torque, tensile properties, tearing properties, friction coefficient, etc., understand the relevant testing equipment and testing services, you can login to view. The more you understand, the more trust! Labthink looks forward to working with companies and institutions in the industry to enhance technical communication and cooperation!