The moisture permeability resistance of packaging adhesive tapes can be determined by the following methods:
Humidity tolerance test: Fix a certain length of adhesive tape on a flat surface, place the entire sample in a high-humidity environment, observe whether the adhesive tape appears to be delaminated, fall off, etc., and record the time and results.
Humidity and heat tolerance test: fix a certain length of adhesive tape on a flat surface, place the entire sample in a high-temperature and high-humidity environment, observe whether the adhesive tape appears to be delaminated, fall off, etc., and record the time and results.
Humidity and heat cycle test: fix a certain length of adhesive tape on a flat surface, place the entire sample in a high-temperature and high-humidity environment, then place it at room temperature to dry naturally, repeat it several times, and observe whether the adhesive tape is delaminated, Shedding and other phenomena, and record the time and results.
Here are the specific steps for each method:
Humidity tolerance test:
Prepare a certain length of adhesive tape and fix it on a flat surface.
The entire sample is placed in a high humidity environment, such as 60°C, 95%RH, usually for 24 hours or longer.
Observe whether the adhesive tape is delaminated or peeled off, and record the results.
Damp heat tolerance test:
Prepare a certain length of adhesive tape and fix it on a flat surface.
The entire sample is placed in a high temperature and high humidity environment, such as 80°C, 95%RH, usually for 24 hours or longer.
Observe whether the adhesive tape is delaminated or peeled off, and record the results.
Damp heat cycle test:
Prepare a certain length of adhesive tape and fix it on a flat surface.
The entire sample is placed in a high temperature and high humidity environment, such as 80°C, 95%RH, usually for 12 hours or longer.
Take the sample out, place it at room temperature to air-dry naturally, and repeat it several times, such as repeating 5 times.
Observe whether the adhesive tape is delaminated or peeled off, and record the results.
In conclusion, different test methods can be used for different types of adhesive tapes, but an appropriate method needs to be selected to ensure the accuracy and repeatability of the test results. During the test, attention should be paid to the accuracy and consistency of the operation to ensure the accuracy and repeatability of the test results. At the same time, attention needs to be paid to the standardization of the test environment and test equipment to ensure the comparability of test results.