How to identify quality problems in flexible packaging

If you strictly follow national standards, it is very simple to solve this problem, but in actual procurement, due to the constraints of equipment, instruments, funds, manpower, etc. Restricted by many factors, this has become a headache for many. How to solve this problem quickly, simply, accurately, saving time and effort has become the focus of everyone's attention. Based on my many years of experience in quality inspection in the printing industry, I put forward some opinions for your reference.

Generally, the quality of a bag should be judged from the printing quality, appearance neatness, bag firmness, and bag materials: If there are printed pictures of physical objects (such as flowers, people, animals, etc.), first look at the physical objects. Pictures and physical pictures can directly reflect the printing quality of the bag. The more realistic the physical picture is, the better the printing quality will be, and vice versa. As long as the physical picture is printed realistically, generally speaking, the printing quality of the entire bag will not be There is a problem.

Secondly, if there is no physical picture, first look at the connection between the two colors in the pattern to see if there is an obvious third color. If the color registration is not accurate during the printing process, the superposition of the two colors will produce a third color. , so that the whole bag will give people a very fuzzy feeling, and even make people feel dizzy. Again, check to see if there are any phenomena such as drawing, fogging, blocking, printing leakage, etc. Generally, these problems mentioned in this point will be picked out during the quality inspection of the printing factory. If you, as the purchaser, send it to the printing party If a large number of these phenomena appear in the finished product bag, it can only show that the other party is extremely irresponsible, so you should replace it quickly. It is divided into heat sealing fastness and composite fastness. The firmness of each bag made of different materials is different. The way to identify it is to point at the sealed edge of the bag and tear it with your hands. If it is difficult to tear, it means the heat sealing firmness is good, and vice versa. However, bags with different uses have requirements for firmness. Differently, bags made of nylon and high-pressure film are generally difficult to tear open by hand. They can be used to hold heavier products such as stones, large particles, etc., while bags made of OPP heat-sealing film are easy to tear. When the bag is opened, it can only contain some light products; after the bag is torn, it depends on the shape and structure of the cross section. If it is torn evenly from the middle of the heat-sealed part of the bag, it means that the heat sealing of the bag is poor and it is easy to break during the production process. , if it is torn from the sealed edge, it means that the heat sealing quality is better; it also depends on the composite firmness of the bag. The method is to first see how many layers of structure there are in the crack, and then use your hands to see if they can be separated. If not If it is easy to separate, it means the composite firmness is good, and vice versa; check the firmness of the bag, and also check whether there are wrinkles, bubbles, etc. on the surface of the bag. 4. Materials used in the bag. First smell if there is any odor inside the bag. If there is any odor, it means that the materials used in the bag (such as film and glue) do not meet the hygienic standards. Secondly, they may affect the normal use of the bag. If there is no odor, it is OK. Check whether the clarity of the transparent part of the bag is uniform and whether there are impurities, etc.

I hope the above points can solve some problems for everyone. If you want to fundamentally solve the problem of bag quality identification, the safest way is to find a professional, large-scale, and long-running flexible packaging printing company to provide You print, because they generally have formal raw material purchase channels, a complete quality management system, and strong accident handling capabilities. Of course, their prices will be slightly more expensive, but in a world where competition is so fierce, quality is life. , it is completely worth spending a few extra cents or even cents.