Abstract: The vacuum packaging used for packaging clean clothes should have excellent sealing performance to ensure that the clean clothes are not contaminated and effectively sterilized in the bag. This article takes the sealing test process for vacuum packaging for medical clean clothes as an example, and introduces the effective detection method of the tightness of the soft package used for cleaning after cleaning, and passes the test process and test principle and equipment parameters. Description, providing a reference for the relevant industry to verify the tightness of clean vacuum packaging.
Keywords: clean clothes, pumping packaging, vacuum packaging, vacuum method, sealing, leakage, sealing tester
1 , meaning
Clean clothes, also known as sterile clothes and clean clothes, are made of special materials and are specially crafted. They have excellent dustproof and antistatic properties, mainly used in pharmaceutical, medical, food, electronics, bioengineering, precision instruments, etc. industry sector. The important thing in the quality control of clean clothes is cleaning and packaging. After strict cleaning and drying operations, the sterile clothes should be placed in a clean polyester or nylon bag and vacuum evacuated. The vacuum-packed package used is usually aseptically packaged, and the bag needs to maintain excellent sealing after pumping to achieve effective sterilization and prevent contamination. Therefore, the sealing performance of the vacuum package used for cleaning the clean clothes is particularly important, and is an important factor that directly affects the sterility, and should maintain an extremely high sealing property without any penetration.
Figure 1 clean clothes and packaging used after cleaning
2 , testing basis
This paper follows the vacuum principle of GB/T 15171-1994 "Test Method for Sealing Performance of Flexible Packages " for the sealing test of vacuum packaging used in clean clothes.
3 , test samples
In this paper, the medical cleansing suit is used as the sample to be tested, and the sealing test is carried out under the pressure of -90 kPa.
4 , test equipment
The sealing performance of soft plastic packages (such as packaging bags, plastic boxes, etc.) is often tested using a seal tester. As employed herein detecting apparatus of Labthink MFY-01 seal test apparatus, the apparatus of LabthinkInstrumentsCo Ltd. self-developed manufacturing.
Figure 2 MFY-01 seal tester
4.1 Test principle
The equipment of the negative pressure method is used for the sealing test of the finished product packaging, that is, the finished product package is placed in a sealed tank filled with distilled water, and then the vacuum pump is used to vacuum the tank to ensure that the negative pressure value in the tank is gradually increased, and the finished product package is gradually expanded. When a certain negative pressure value is reached, if there is a leak (ie, poor sealing), the gas inside the package will overflow from the inside of the sample along the poor seal under the pressure difference, by observing the surface of the sample in the water. Whether there is continuous bubble generation or sample shape recovery after releasing the vacuum, determine its sealing performance.
4.2 Equipment parameters
The degree of vacuum is controlled from 0 to -90 KPa and the test accuracy is level 1. The effective dimensions of the vacuum chamber include 270 mm ( diameter ) × 210 mm ( height ) , 360 mm ( diameter ) × 585 mm ( height ) , 460 mm ( diameter ) × 330 mm ( height ) are available in three types; the system uses digital preset test vacuum and vacuum hold time to ensure the accuracy of test data; automatic constant pressure air supply further ensures that the test can be preset vacuum Under the conditions; professional software supports automatic backflush unloading and automatic end of the test function to ensure the smooth progress of the test process.
4.3 Scope of application
This equipment is suitable for the sealing test of packaging bags, bottles, tubes, cans, boxes and other packaging parts in food, pharmaceutical, medical equipment, daily chemical, automotive, electronic components, stationery and other industries. It is also possible to test the sealing performance of the test piece after the drop and pressure test. The equipment complies with national and international standards such as GB/T 15171 and ASTM D3078 .
5 , the test process
(1) Immerse the sample of the vacuum bag to be tested in the water of the sealed tank of the equipment and cover the sealing cover.
(2) Set the vacuum to -90kPa and keep the pressure for 30s . Turn on the vacuum pump and press the start button on the device panel to start the test.
(3) Observe whether or not continuous bubbles are generated on the surface of the sample during vacuuming or holding.
6 , test results
In this paper , the sealing performance of three clean bag samples was tested. The test results showed that no air leakage occurred at -90 kPa .
7 , conclusion
The tightness of the vacuum bag used for packaging clean clothes after cleaning is an important factor affecting the aseptic effect of the clean clothes. In this paper, the MFY-01 seal tester is used to test the tightness of the packaging bags used in medical cleansing clothes. The effective method of sealing the vacuum packaging bags is introduced. The test process is simple and the equipment is easy to operate. Labthink is committed to providing professional packaging testing equipment and intimate packaging testing services to customers around the world, covering a wide range of industries including food, pharmaceuticals, daily chemicals, medical devices, and electronics manufacturing.
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