Test method for resistance to bismuth of K-coated composite film materials
Abstract: The bismuth resistance of K-coated composite film materials is an important factor affecting the overall barrier properties of packaging, which is directly related to the quality and quality of the materials. In this paper, the test method of the anti-cracking performance of the K-coated composite film material produced by a company is introduced as an example. The test method of the anti-cracking performance of the soft plastic composite film material is introduced, and the equipment FDT-02æ‰æ“ tester and OX2/230 are adopted. The introduction of oxygen permeability test system parameters, scope of application, test principle, test process, etc., provides a reference for enterprises to monitor the tamper resistance of packaging materials.
Key words: tamper resistance, overall barrier properties, oxygen transmission rate, helium tester, oxygen transmission rate test system, K-coated composite film material
1, meaning
PVDC (polyvinylidene chloride) is a high-barrier film material. The K-coating material, PVDC coating material, is used to package the cake by coating the surface of the film with a PVDC layer to improve the barrier properties of the material. , moon cakes, nuts, candy and other products. For K-coated composite membrane materials, the thickness, compactness, adhesion to the substrate, and easy to fall off of the K coating will directly affect the material's oxygen, nitrogen, water vapor and other gases. Barrier performance, and when the K-coated composite film material is used for packaging products, it is inevitably subject to external force smashing and extrusion during transportation and storage of the product. If the K coating is poor in tamper resistance, the coating surface is easy. Cracks are generated and even separate from the substrate, which in turn affects the barrier properties of the entire material. Therefore, by monitoring the material's tamper resistance, it can help to continuously improve the coating process of the K coating, thereby improving the packaging suitability of the material.
2, test samples
The test sample used in this test is KPET/PE containing K-coated composite film material produced by a certain company.
3. Test basis
At present, the method standards related to the sputum test have not been released in China. The standard for the sputum test on the sample is ASTM F392. The standard for the oxygen barrier performance test of the anterior and posterior samples is GB/T 19789- 2005 "Case measurement method for plastic film and sheet oxygen permeability test of packaging materials".
4, test equipment
The test equipment used in this test is FDT-02æ‰æ“ tester and OX2/230 oxygen transmission rate test system. Both of these equipments are independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd.
Figure 1 FDT-02æ‰æ“ tester
Figure 2 OX2/230 oxygen transmission rate test system
4.1 Principle of the test
In this paper, the uranium resistance is verified by the change of oxygen permeability of the sample before and after. The oxygen transmission rate test adopts the principle of equal pressure method, that is, the sample divides the test chamber of the equipment into upper and lower chambers, and the upper chamber is filled with high-purity oxygen of a certain pressure, and the lower chamber is equal to the upper chamber pressure. Pure nitrogen and oxygen are infiltrated by the upper chamber of the device into the lower chamber under the action of the concentration difference, and are carried by the nitrogen in the lower chamber to the sensor for quantitative analysis, thereby obtaining the oxygen permeability of the sample. The sputum test simulates the force that the sample may be subjected to during use, and squats along the sample in both horizontal and vertical directions.
4.2 Equipment parameters
(1) FDT-02æ‰æ“ tester
æ‰æ“ frequency 45 times / minute; tensile pressure is 300 N; rotating torque is 2 Nm; æ‰æ“ angle 440 ° or 400 °; horizontal stroke is 155 mm or 80 mm; five standard test modes, four sample stations are easy to achieve Combined test under different conditions; fast switching between long and short strokes greatly improves test efficiency; the system is controlled by microcomputer, with LCD screen, menu interface and PVC operation panel, which is convenient for users to carry out test operations quickly and conveniently.
(2) OX2/230 oxygen transmission rate test system
The film test range is 0.01 ~ 6500 cm3 / (m2 · d), resolution 0.001 cm3 / (m2 · d); container test range is 0.0001 ~ 60 cm3 / (pkg · d), resolution is 0.00001 cm3 / (pkg · d); 3 samples can be tested at the same time; test temperature range 15 ° C ~ 55 ° C, accuracy ± 0.1 ° C; test humidity range 0% RH, 35% RH ~ 90% RH, accuracy ± 1% RH; up to 10 The instruments are connected in parallel to establish an efficient system for simultaneous testing of 30 samples. It can be combined with the water vapor transmission rate test system to form a hybrid test system, which is controlled by a computer to achieve simultaneous oxygen and water vapor transmission rate testing. Efficient and convenient test method; support LystemTM laboratory data sharing system, unified management test results and test reports.
4.3 Scope of application
(1) FDT-02æ‰æ“ tester
This equipment is suitable for testing flexible films, composite films, coated films and paper. These include various aluminum-plastic composite films, plastic composite films, aluminized films, nylon films, coated films, and papers for food and drug packaging. Meet the international standard ASTM F392.
(2) OX2/230 oxygen transmission rate test system
This equipment is suitable for oxygen transmission rate testing of plastic film, container, sheet, paper, cardboard and composite materials. The film materials include various plastic film, paper-plastic composite film, co-extruded film, aluminized film, aluminum foil, aluminum foil composite film and other film-like materials, and the sheet materials include various engineering plastics, rubber, building materials and other sheet materials, containers. The categories include bottles, bags, cans, boxes, barrels, etc. made of plastic, rubber, paper, paper-plastic composite, glass, metal, etc. In addition, the special configuration fixture of this equipment can also be applied to oxygen transmission rate test of special packaging such as medical packaging, automobile fuel tank, battery plastic casing, plastic pipe and solar backing. Can meet a variety of national and international standards, such as GB/T 19789, GB/T 31354, ISO 15105-2, ASTM D3985, ASTM F2622, ASTM F1307, ASTM F1927, JIS K7126-2, YBB 00082003.
5, the test process
5.1 Oxygen permeability test before sputum
(1) Cut three specimens with a diameter of 108 × 108 mm from the sample.
(2) Apply a layer of vacuum grease on the edge of the test cavity surface, and clamp the three samples to the surface of the three test chambers of the OX2/230 oxygen transmission rate test system to avoid wrinkles and The vacuum grease is in good contact and the sample is clamped.
Figure 3 sample clamping diagram
(3) Add distilled water, open the system air source, and adjust the air source pressure as required to make the humidity in the upper and lower chambers reach the set value.
(4) Set the test temperature, test mode, sample area, thickness and other parameters to start the test.
(5) Click the Start Test option and the test begins. The instrument automatically records the test process data and calculates the final test results.
5.2 æ‰æ“ test
(1) A sample of 280 mm in length and 200 mm in width was attached to the instrument with pressure-sensitive double-sided tape.
(2) Select the æ‰æ“ mode, close the instrument glass door, press the “TEST†button, and the test starts.
(3) When the number of times the instrument has reached the set value, the instrument will automatically stop.
Figure 4 æ‰æ“ process
5.3 Oxygen permeability test after helium
The sample surface was cut from the surface of the crucible, and the other test operations were the same as in 5.1.
6, the results
The average oxygen transmission rate of the sample tested in this test was 9.1308 cm3/(m2·24h). After C mode, that is, after 270 times, the average oxygen transmission rate of the sample was 9.6918 cm3/(m2). · 24h), a slight increase, indicating that the sample has high resistance to cockroaches.
7. Conclusion
In this paper, the uranium resistance of K-coated composite membrane materials was tested by testing the change of oxygen permeation of the samples before and after the sputum. From the experimental process, the equipment is easy to operate, the degree of intelligence is high, and the test results are highly accurate. , good repeatability, can reflect the sample's resistance to sputum. In addition to the barrier properties before and after the comparison, it is also possible to verify the resistance of the material by applying turpentine to see if there is pinhole on the surface of the sample. This method is generally applicable to packaging materials containing aluminum foil. Jinan Languang Electromechanical Technology Co., Ltd. is a high-tech enterprise specializing in R&D, production and packaging testing services for packaging testing equipment. Existing customers have been involved in food, medicine, packaging materials, automobiles, daily chemical, third-party testing institutions and university research. You can check the relevant inspection equipment and testing service information in different industries such as institutes. The more you understand, the more you trust! Labthink is looking forward to enhancing technical communication and cooperation with enterprises and institutions in the industry!
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