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Zhejiang Dongda Paper Co.,Ltd

Add:Gaoyang Village, Chunjiang Avenue, Fuyang District, Zhejiang Province, 311421 China


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Definition Of Gray Board
May 20, 2017

Gray cardboard is made from a recycled waste paper. Products are divided into single gray, double ash, all gray, environmentally friendly packaging materials. The main purpose of the product: packaging boxes, advertising board, folders, frame back, luggage, hardcover books, storage boxes, samples, liner, partitions and so on.

1. Quantitative

It refers to the weight of the paper unit area, expressed in g / m2, that is, a square meter of paper weight. The quality 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 arrangements for quantitative performance and corresponding print production, in order to better reduce consumption, improve product quality and equipment efficiency.


It is the thickness of the paper, the unit of measurement is usually expressed with ㎜. Thickness and quantitative and tightness has a close relationship, the general situation, the paper thickness, the corresponding quantitative high, but the relationship between the two is not absolute. Some paper is thin, but its quantitative and thicker equal or over. This explains the degree of tightness of the fiber structure of the paper, which determines the amount and thickness of the paper. From the perspective of the use of results, paper thickness uniformity is very important. Otherwise, will affect the automatic continued paper, glue evenness and so on.


It is the weight of the paper per cubic centimeter, with g / cm3. The tightness of the paper by the quantitative and thickness calculated by the following formula: D = G / d * 1000, where: G said paper quantitative; g for the paper thickness of.

Tightness is a measure of the degree of density of the paper structure, if the tightness is too large, the paper is easy to brittle, opacity and water absorption will be significantly reduced, difficult to dry.

4. stiffness

It is the performance of the paper against the collapse of another object, but also the rough performance of paper fiber organization.

5. Smoothness

It refers to the extent of the paper surface bump, the unit expressed in seconds, measurable. The detection principle is: in a certain degree of vacuum and pressure, a certain amount of solvent through the glass surface of the glass and the surface of the gap between the time used. When the paper is smoother, the slower the air passes, and conversely the air passes faster.

6. Scalability

It refers to the paper in the moisture or moisture loss occurs after the size of the variation. The more loose the fiber tissue of the paper, the lower the tightness, the higher the stretchability of the paper; conversely, the lower the expansion ratio.

7. Water content

Water content in cardboard. Is generally about the standard. Double gray cardboard moisture content of 8-12%.

8. vertical and horizontal

It refers to the direction of the arrangement of paper fibers. In the process of papermaking, the fiber runs along the direction of the paper machine in the direction of the paper. It can be identified from the acute angle of the network mark. Perpendicular to the vertical for the horizontal, vertical paper using the deformation value is small, the use of horizontal lines in the process of large amount of telescopic variation.

9. breathability

In general, the thinner the paper, the lower the tightness, the greater the permeability. The unit of air permeability is ml / mim or s / 100 ml, which means the amount of air passing through the paper in 1 minute or the time required to pass through 100 ml of air.

10. Positive and negative

Paper, the pulp attached to the steel mesh to filter dehydration way qualitative. In this way, such as the side of the net due to small fibers and fillers with water loss, so leave the network marks, the paper is thicker. While the other side does not rely on the network is fine. Smooth, so that the formation of positive and negative differences in paper, although the production after drying, calendering, positive and negative are still different.

Zhejiang Dongda Paper Co.,Ltd

Add:Gaoyang Village,Chunjiang Avenue,Fuyang District,Zhejiang Province,311421 China

Contact us:Liu Dong