Air permeability test of glass packaging containers
previously, combined with ASTM F 1307 standard, we have briefly introduced the oxygen permeability test of packaging containers. Now, aiming at the barrier performance of Labthink blue light from the new generation of clear film and coating, we begin to introduce the detailed steps of oxygen permeability test of packaging materials to toy-c1, the first domestic packaging material oxygen permeability test equipment developed for the proximity of metal sheet and aluminized film Test preparation
first, prepare a bottle of 40L high-purity nitrogen; One 40L pure oxygen bottle (if you plan to conduct oxygen permeability test in the laboratory environment, you can omit the oxygen source), and complete the proper connection between the equipment air supply pipe and the air outlet pipe. Then carry out sample preparation, accessories, samples, and installation of oxygen hood.
1.1 sample preparation the oxygen permeability test components of packages currently provided by toy-c1 can meet the following requirements: the inner diameter of the bottle mouth is greater than φ 13mm, the outer diameter of the bottle mouth is less than φ 50mm: the diameter of the bottle is smaller than the middle when the 100% oxygen concentration test is carried out φ 120mm, the height is less than 360mm, and the size of the bottle is unlimited when tested in the laboratory environment. Sample preparation is a key step related to the success or failure of the test, which must be carefully operated
1.1.1 preparation work
prepare three packages to be tested (the packages are required to be free of damage and scratches, and confirm that their interior is dry and free of water droplets), more experimental machine information, alcohol cotton balls, vacuum grease, three bottle holders, potting glue, glue container balance, etc.
1.1.2 operation process
first of all, more and more quality problems are also highlighted. Wipe the groove of the bottle holder with alcohol cotton balls and dry it, This is a step that cannot be ignored before sample preparation, otherwise it may cause the potting glue to be separated as a whole due to oil contamination in the groove. Then configure the potting glue according to the method provided by Labthink Languang (it needs to be completed by using glue containers, scales and other auxiliary tools). Pay special attention to the full mixing of potting glue and corresponding ingredients in the configuration process, otherwise the potting glue may not solidify for a long time. Then, Place the sample to be tested (dry inside) with the opening facing down in the middle of the bottle holder, and inject the prepared potting adhesive into the tank (with the help of auxiliary tools). The potting of the sample should be completed within one hour after the potting adhesive is configured.
class 2, class 3 and class 4 give a bell shaped range from low temperature to high temperature. After the potted sample is placed at room temperature for about 24 hours, the glue will completely solidify, but if the room temperature is too low Or the setting time will be prolonged due to insufficient mixing during the preparation of potting adhesive. So far, the oxygen permeability test samples of packaging have been made. Figure 1 shows some completed packaging samples
1.2 installation of package test components
first remove the three upper test cavities, then wipe the working surfaces of the three lower cavities, the additional lower cavities and the lower plane of the bottle holder with an alcohol cotton ball, and observe whether all 0-shaped sealing rings of each group of components are intact. Then, install the additional lower cavities according to the method provided by Labthink blue light. Tighten the additional lower cavities, Be careful not to block the gas path.
install the specimen on the additional lower chamber. Be careful not to scratch the lower surface of the bottle holder, and use auxiliary tools to fasten the bottle holder so that it can be reliably fixed on the additional lower chamber.
when installing the oxygen mask, first wipe the lower surface of the oxygen mask with an alcohol cotton ball, and then gently cover the oxygen mask on the sample. Here, also pay attention not to block the gas path. Tighten all screws after inspection. Install oxygen masks when conducting 100% oxygen concentration test and special concentration test (the required oxygen concentration is not equal to the oxygen concentration in the laboratory environment). If testing in the laboratory environment, there is no need to install oxygen masks.
after the installation of the whole package components, it should be as shown in Figure 2.
(to be continued)