Can you briefly explain the release force testing of fluorine-based release film?
The release force of release film is commonly tested through various methods, including vertical testing, 20-minute testing, 24-hour testing at room temperature, 24-hour aging testing, and residual adhesion rate testing. The testing of the release force of fluorine-based release film is no exception. As a routine test, these data are also measured. The practical application of fluorine-based release film is particularly complex, and there are also some special testing methods that are tailored to practical applications. This article will also share some insights into these topics.
Whenever it comes to peel force testing, there are certain standard conditions. For peel force testing, the standard testing temperature is 23±2℃, the width of the test tape is 1 inch (2.54 cm), and the speed of the tensile machine is 300 mm/minute.
The commonly used test tape for fluorine-based release films is the Siwei MY2G tape. While some other tapes are also used, MY2G is the most versatile. The testing methods for release force at 20 minutes, release force at room temperature for 24 hours, and aging for 24 hours are consistent with those for silicone release films.
There are many testing methods for residual adhesion. Here is a relatively versatile testing method for your reference. The steps are as follows: a. Attach MY2Y tape to a fluorine release film using a pressure roller, cut it into samples for testing; b. Place the attached samples in a 70-degree oven under a load of 70g/cm2 for 20 hours; d. Remove the samples from the oven and cool them for 2 to 4 hours; e. Peel off the MY2G tape from the fluorine release film, attach it to a PET original film (or a mirror steel plate for standard testing) using a pressure roller, cut it into test strips, and leave it for 20 minutes to obtain value A; f. Attach the MY2G tape to a PET original film (or a mirror steel plate for standard testing), and test the peel force for 20 minutes. Obtain value B; g. Residual adhesion SA = (A/B) x 100%; h. Test 3 to 4 samples each, and complete the test.
Some customers also perform step b by increasing the oven temperature and shortening the placement time. This way, they can quickly test the residual adhesion rate on the production line to assess the stability of the product.
In practical applications, many customers still test data over longer periods. For example,Fluorine-based release film they may test data at room temperature for 30 days, or test data after aging for 7 or 14 days, in order to infer long-term stability and aging creep. Although this does not 100% accurately reflect the actual long-term performance of the adhesive tape, it still provides a significant reference.