Reasons and Solutions for Black Spots in Corrugated Carton Packaging?

In general, the quality requirements for corrugated cardboard are: the cardboard should be flat, the size should be accurate, and there should be no spots on the surface. If there are spots on the surface of corrugated cardboard, it will affect the printing color, and the color of the spot will form a color difference. And some electronic customers on the surface of the paper is very strict, generally do not allow spots. So why do spots appear on the surface of paper?

carton packaging

phenomenon: spots on the surface of base paper are generally due to the problem of base paper, because in the production process of base paper, there are residues of clinker components in it, and chemical operation is carried out through the heating process of face paper. after the melting of fine plastic particles, black spots of different sizes are produced. in this case, recycled paper is used as the paper-based hanging paper.

solution: sample the tissue paper before use and stick it to the preheating cylinder, heat it for two minutes and then take it off to watch the paper sample. at this time, it can be used without spots. if any, replace the base paper. In addition, when choosing the base paper, do not covet cheap, should choose a good reputation of the brand base paper.