Main inspection items of packaging bag: specification, size, length, width, thickness, appearance, overprint error, color difference, peel strength and heat sealing strength.
1. The length and width are measured by a ruler, and the thickness is detected by a thickness gauge. The detection method is the same as that of the packaging film manufacturer.
2. The color difference is mainly checked with the standard seal sample, and the color difference should be consistent in the arm distance. In terms of color, at present, the printing factory also uses a 50 times magnifying glass to carefully check the color of printed matter. Generally, the color is combined by one dot. The packaging film manufacturer introduces that if the color is not correct, the dot will appear irregular distribution. Generally, the dot is regular and the dot is circular.
3. The main phenomenon of overprint is to check whether there is duplication.
4. The peel strength and heat sealing strength are mainly tested by electronic universal testing machine.
The principle of the test is the same as that of our computerized tensile tester. The detection of peel strength is mainly to cut the packaging bag into 15 mm baskets with a blade, and then fold the bag with a blade at one end, and then manually layer the bag. After laminating, the bag is clamped on one side of the tension meter on both sides, and then it can be operated with a computer tension meter. The peel strength can be tested.
5. In addition, in the packaging film manufacturers can also detect the oxygen permeability of packaging bags, the detection instrument is the constant temperature gas oxygen permeability test device. http://www.ycritai.cn/