Xenon lamp aging test box printing ink light resistance aging test

More and more inks require light fastness testing, such as jet printing inks and inks for packaging materials. GB/T 22771-2008 standard "Evaluation of Lightfastness of Printed Matters and Printing Inks by Filter Xenon Arc Lamp" was revised to adopt the international standard ISO12040:1997. The first national standard for aging testing. Applying this standard can evaluate the light fastness level of different printing and ink samples. The xenon lamp aging test chamber is a test equipment independently developed and produced by Standard Group (Hong Kong) Co., Ltd., with high cost performance and complete after-sales service.

 

Printed matter and printing ink xenon lamp aging test:

 

The "4.4.1 Exposure" section of GB/T22771-2008 contains two exposure methods. One is the exposure test for only one sample. This test is relatively simple, as long as the test sample is exposed to light according to the prescribed method (that is, the test conditions required in the standard) until obvious changes occur. The standard also points out that "the so-called obvious change is equal to or less than grade 3 of the gray scale card for assessing discoloration in accordance with GB/T 250. The observer should ensure that no visual fatigue occurs during the test, and the visual observation should have standard Observation conditions for prints".

 

The other is to conduct simultaneous and systematic experiments on the same series of prints. This test uses a continuous covered exposure method to test the lightfastness of prints with different degrees of lightfastness in one test. Specific steps are as follows:

 

Step 1: Expose the sample until the blue wool standard of grade 3 shows obvious changes corresponding to grade 3 of the gray scale for assessing discoloration;

 

Step 2: cover a quarter of the exposed part of the printed matter and the blue wool standard, and continue to expose until the blue wool standard of grade 5 shows obvious changes corresponding to grade 3 of the gray sample card for assessing discoloration;

 

Three steps: cover a quarter of the part that is continuously exposed, and continue to expose until the blue wool standard of grade 6 shows an obvious change corresponding to grade 3 of the gray scale for assessing discoloration;

 

Step 4: Cover more and continue to expose to the sun until the visually observable change occurs in the blue wool standard of grade 7 (grade 4 of the gray sample card for evaluating discoloration).

 

Because under normal circumstances, there are many test samples in ink factories or printing factories, if the first exposure method is used, it is not realistic to test only one sample at a time. Therefore, in this test, we choose the second exposure method, and conduct xenon arc accelerated light resistance aging test on 13 different offset printing ink samples at the same time, and at the same time, we also carry out exposure and SDC 1 to 7 blue wool standard.