Black card paper is mainly C1S black card paper, C2S black card paper, black card paper with grey back, purp wood pulp black card paper, How to distinguish the quality of black card paper ?

1.Take C1S Black card paper for example, get the black card paper sample, first look  surface, fineness, whether there are white spots on the surface, another 45 degrees of Angle "black card paper" to look at the black card paper core, paper core is white, the impurity is not high quality black card paper.High quality "black card" core is black, commonly known as through heart black card paper, paper material is uniform, impurity is little, color wants even and brightness reflection is strong, the surface does not have excessive impurity, white dot and oil dot.And the surface is smooth and delicate, and should see "black card" whether the surface can see the trace that long fiber makes.

2. Folding test: if a piece of inferior "black card paper" is folded several times within 2500G, it is likely to burst the edge (burst line) or break. Otherwise, if a piece of high-quality "black card paper" is folded several times, the above situation will not appear.However, the resistance of black paper folding and product humidity is also related, such as paper too dry, black paper also easy to burst.

Above two points to distinguish black card paper quality is the most important two points, is due to the business to pay more and more attention to product package, and due to its particularity, black paper on the product packaging, is becoming more and more widely application, compared to other products made of black cardboard material also more high-grade, so for the master is important to distinguish the quality of the black card paper also.