How to measure the air permeability of vacuum packaging bags

　　Air permeability is a very important performance parameter of vacuum packaging bag, which is usually indicated by air permeability amount or air permeability index.

　　The air permeability is the amount of steam when a certain steam body stably passes through the total area of the enterprise for 24 hours under the condition of stable temperature and stable pressure difference (-), which is generally one atmospheric pressure difference (b) under the standard condition), and the enterprise is Cm '/m2 ● Dpa.

　　The permeability index is generally an atmospheric pressure difference under the stable temperature and pressure difference (-), the total area of the enterprise passing smoothly, the permeability of the enterprise's thin and thick raw materials (b) under the standard condition), and the enterprise is Cm '* cm/cm2. s+pa.

　　The testing equipment for permeability and permeability index is a permeability tester, which maintains a certain vapor pressure difference on both sides of the test piece under a certain temperature and environmental humidity, accurately measures the change of air pressure at the bottom pressure side of the test piece, and then calculates the permeability and permeability index of the tested sample.

　　It uses the best international micro pressure accurate measurement technology, and uses the eddy current principle to make the detection more convenient and feasible.

　　The test process is as follows:

　　(1) Turn on the chassis power first, then turn on the computer, run the test tool, and observe whether the O&M management system light flashes at a fixed frequency to check whether everything is normal in the system software.

　　(2) Turn the main gate valve of the test steam cylinder in the opposite direction, and then adjust the output pressure valve clockwise to 0.4 mpao

　　(3) Take down 3 required test pieces with a special sampler, and then check the wound at the bottom of the low signal variable earth. The edge of the test piece should be free of gaps and scars, and the surface of the test piece should be flat without scratches and damage.

　　(4) Adjust the temperature and humidity of the interface test according to Gb2918 for at least 4 hours.

　　(5) Put the selected test pieces on the test chamber table, place them successively, and completely cover the test. Compound processing technology and machine equipment for raw materials of plastic flexible packaging. Cover the upper chamber of the detection chamber and tighten the rocker to clamp the test piece.

　　(6) Click the "Customer Information Setting" button on the main screen of the computer, input the corresponding performance parameters (b) thickness of the test piece, measurement time), and click the "Save and Withdraw" button.

　　(7) Click the "Experiment" button on the computer screen, and the instruments and equipment will be gradually tested.

　　(8) During the whole process of detection, do not leave the instruments and equipment, and carefully observe the experimental curve graph displayed on the computer screen. When a part of the parallel lines of the curve graph exceed the range of the big grid abscissa axis set by the mobile phone software, it indicates that the experimental data information has become stable, and the experiment can be completed. Click the "Stop" button to terminate the experiment.

　　(9) The system will automatically pop up the test report, record the experimental data information, and click the "Save" button to return to the main screen.

　　(10) Open the upper chamber of the rotary release handle and take down the test piece to replace the rapid quantitative filter paper and test piece. Repeat the procedures (6), (7), (8) and (9) to carry out the experiment again.

　　(11) After the experiment is completed, loosen the upper chamber of detection, take down the test piece, and tighten it clockwise to keep it clear. After turning off the air navigation, click the "test" leg, and the working pressure value indicated in the left table of Chengjing Server is zero. Then click the "Srop" key, and unscrew the output pressure valve in the opposite direction.

　　What is the meaning of textured vacuum bag

　　One side of the textured vacuum bag is colorless and transparent, and the other side is pressed with tiny lines. The textured vacuum bag is made of seven layers of co extruded film without glue compounding. Many manufacturers say that glue is non-toxic. At present, competition among peers is fierce. Many manufacturers are impetuous and eager for quick success and instant benefit. Only cut corners on raw materials to reduce costs. Therefore, it is difficult to guarantee the quality of glue. In the process of cooking, the glue in the ordinary vacuum bag will boil out, and it is unknown whether it is toxic. Relatively speaking, the textured vacuum bag is hygienic and safe. The textured bag is not printed and will not be polluted by ink and chemical solvent. This is also the reason why people love the vacuum bag with lines.

　　Why use textured bags for vacuum pumping?

　　Because one side of the textured bag is pressed with tiny lines, it can form a microchannel when vacuuming, which makes the vacuuming effect more thorough and the appearance more smooth after vacuuming. Because the tiny lines can form a microchannel when vacuuming, the requirements for vacuuming machines are relatively low, which can be applied to household, commercial, large, small and vacuum machines.

　　Why use textured bags for vacuum pumping?

　　Can we use textured vacuum bags for wet goods?

　　Generally speaking, wet things refer to food with soup, oil and so on. Food with soup like this is more suitable for vacuum pumping with textured vacuum bags. When vacuum packaging bags for ordinary food vacuumize soup food, the uneven distribution of soup often leads to poor vacuum pumping effect. The textured vacuum bags can solve this problem. When vacuumizing with small grain, the soup can be pumped with uniform distribution, The vacuum pumping effect is better, and the package shape is smooth and beautiful.

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