1. The printing quality:
See the joining together of two colors whether have obvious of the third color, physical figure of realistic level, the higher the better, see if there is a wire drawing, fog version, edition, printing and other phenomena.
2. The bag material:
Packaging needs no peculiar smell.Is faulty bags generally let a person feel do not conform to the hygiene standards, also may affect the normal use of the bag.If there is no peculiar smell, transparency, and need to check the bag is even, no matter how sense of impurities and so on.
3. The bag is firm level:
Bag bag made of general it is hard to tear by hand can be used to compare a heavy products such as stone, large particles of solid degrees are divided into two kinds, in line with the strong and hot air solid degrees.Wuxi aluminum foil bag bag for materials and different levels of different so strong.Main distinction method is on the bag sealing side by hand.Nylon and high-pressure membrane complex objects, etc., and the hot sealing membrane made of OPP bag is good apart, can only put some light products;Tear the bag, to look at the shape of cross section and structure, if from evenly split between heat sealing bag, bag heat sealing is very poor, the packages to work open during the production process.If a tear from sealing side, heat sealing quality is better;Also look at the bag of composite reinforcement, the method is to first look at the gap in several layers of structure, reoccupy hand look at can you separate it, if it is not easy to separate, then composite fastness is good, the opposite is poor;In addition, the test bag firm level and at the same time it remains to be seen whether the bag surface bubbles or buckling, etc.
4. The uniformity of appearance:
To observe the stiffness of bag.General flatness is higher, the better, but due to the difference of materials needed.Such as bags made of nylon and high voltage composite membrane, the heat sealing bag will have wavy;Remained to be seen whether the bag of trimming, as tidy as possible.