How about the level of paper used to make cartons?
Types of corrugated paperboard(1) classification according to the shape of corrugated teeth;1.V corrugated 2.U type corrugated 3.UV corrugated(two) classification according to corrugated type;1.A type corrugated 2.B, corrugated 3.C, corrugated 4.E corrugated(three) classification according to the number of plies;1. single wall corrugated cardboard2. single wall corrugated cardboard3. double corrugated (five layers) corrugated paperboard4., three, double faced (seven layers) corrugated cardboard
Carton is used to weight the same distinction, but the weight of the paper and some other indexes are the same, because each plant for the production of paper tension will have difference (tightness refers to the unit thickness, weight per unit area), another name for the density, we know the density is bigger, the higher the strength, so usually distinguish between, will name and paper materials and G together rewriting factory.Such as nine dragons + high strength +250g and so on, this method is very scientific.
The higher the strength of paper and weight boxes. The paper standard is higher, the heavier weight, the more layers, the less, the greater the volume of carton cost is higher. With the tear can smooth surface and uniform level respectively: after tearing fracture all fiber is long in the same color as the kraft paper, shorter in color is a little bit of difference is a smooth surface, only the surface of a layer of fiber length, the surface color difference is B grade, C grade appearance is smooth, the other with B inhomogeneous fiber, D class is the above characteristics are not.
Packing box material selection: Paper standard from high to the end is divided into kraft paper, A, B, C, D grade, corrugated paper is divided into A, B, C, D level. Paper weight is generally: the quality per square meter is 350g ~ 110g.
