Grey cardboard is produced from a type of recycled waste paper. The products are divided into single gray cardboard, double gray cardboard, full gray cardboard. The paper surface is smooth and flat, with good stiffness, no deformation, no separation, and bending resistance. Terminator. It is an environmentally friendly packaging material. The application range of gray cardboard includes: packaging boxes, advertising boards, luggage, hardcover books, storage boxes, samples, linings, partitions, etc.

characteristics of grey cardboard


It refers to the weight per unit area of ​​paper, expressed in g/m2, that is, the gram weight of one square meter of paper. The quantitative level of the paper determines the physical properties of the paper, such as tensile strength, tear, tightness, stiffness and thickness. Therefore, according to the characteristics of the equipment, arranging the quantitative printing parts corresponding to its performance for production can better reduce the consumption and improve the product quality and the efficiency of the equipment.


It is the thickness of the paper, and the unit of measurement is usually expressed in ㎜. Thickness is closely related to quantitative and tightness. Generally speaking, the larger the thickness of the paper, the correspondingly high quantitative, but the relationship between the two is not absolute. Some papers are thin, but their basis weight is equal to or more than that of thicker ones. This shows the tightness of the fiber structure of the paper, which determines the basis weight and thickness of the paper. From the point of view of the use effect, it is very important that the thickness of the paper is uniform. Otherwise, it will affect the automatic paper feed, gluing evenness, etc.


It refers to the weight of paper per cubic centimeter, in g/cm3. The tightness of the paper is calculated from the basis weight and thickness according to the following formula: D=G/d*1000, where: G indicates the basis weight of the paper; g is the paper thickness of. The tightness is a measure of the density of the paper structure. If the tightness is too large, the paper will be easily brittle, the opacity and water absorption will be significantly reduced, and it will not be easy to dry.

It is also easy to calculate the cardboard thickness according to the above formula. Its formula is: d=G/D.

Example: Find the thickness of 500g/m2 double gray cardboard (its tightness tab is 0.625g/cm3, which is also our common indicator). 500g/m2÷0.625g/cm3=0.0008m=0.8mm

The unit conversion of m2 and cm3 mentioned in the previous step should be kept in mind, otherwise it is easy to cause misunderstandings. The method is: cm3/m2=(1*0.000001)m, converted into mm is our actual thickness.


It refers to the degree of unevenness on the surface of the paper, expressed in seconds, which is measurable. The detection principle is: under a certain degree of vacuum and pressure, the time it takes for the air of a certain solvent to pass through the gap between the surface of the glass plate and the surface of the sample. The smoother the paper, the slower the air will pass, and the faster the air will pass.

Main application

After understanding the characteristics of grayboard paper, his main uses:
Packaging boxes, advertising boards, folders, photo frame backboards, luggage, hardcover books, storage boxes, samples, liners, partitions, etc.

grey cardboard
Grey cardboard

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