Corrugated paper ring press strength improvement plan

With the development of the national economy and the improvement of people’s living standards, the packaging industry has achieved rapid development. Corrugated paper is a major raw material for the packaging industry, and the amount and use of corrugated paper have been increasingly developed. With the international shortage of papermaking raw materials and environmental protection and other factors, the development of corrugated base papers to low-quantity trends can save papermaking raw materials on the one hand, and businesses and manufacturers on the other hand have greater profit margins. However, many problems have also been exposed in the use of corrugated base papers, the most important of which is the corrugated base paper's crush strength problem.

Ring crush strength refers to a certain size of corrugated paper sample, inserted in the sample seat, forming a ring, compressed between the two measuring boards, can withstand the maximum force before crumple. The ring pressure strength is the most important and important quality index of the corrugated paper in the process of use. It largely determines the quality and grade of the corrugated base paper. Here is how to control and improve the ring-press strength of corrugated base paper in the production process. Explain the author's many years of experience for manufacturers and merchants to discuss.

First, increase the thickness of cardboard

Increasing the thickness of the board can significantly increase its crush strength. While increasing its thickness, in addition to properly increasing its quantification, other more effective methods are:

1. Use chemical additives such as thickening agents.

2. Control press and calender pressurization.

In terms of crushing pressure, the pre-pressing pressure and a main pressure should generally be increased, and the calendering pressure should be appropriately reduced.

Second, a reasonable choice and match the ratio of slurry

In general recycled paper or recycled pulp, the content of fine fibers and fillers is large, so it will greatly affect the ring-crushing strength of the paperboard and should be reasonably proportioned. In the case of non-regenerated pulp, the type of raw materials for general pulping, the hardness of the pulp, and the homogeneity of cooking have a great influence on the crush strength.

Third, control the degree of pulping and tightness of the pulp

The degree of beating of the slurry has a great influence on the crushing strength, but the degree of fluffing is not as high as possible. Its relationship with the crush strength is a parabola with a peak value. The same tightness control of the ring pressure strength is similar to the impact of the beating degree on the ring pressure strength. Each manufacturer should select and determine a reasonable degree of beating and tightness according to its own raw material ratio and the actual use of the corrugated base paper. Value, and strict control in the production of small.

Fourth, the Internet concentration

Generally, in the case of affecting other measures, the concentration of Internet access should be controlled as large as possible, which will help improve the intensity of the ring pressure. At the same time, with the increase in the amount of fillers such as talc, the paperboard ring pressure will show a significant downward trend, so we must control the amount of filler added.

Fifth, the impact of pulp speed and speed

Pulp speed and speed are controlled so that the proportion of fibers distributed between Z in the fiber is increased as much as possible. In addition, the use of a spray-type sizing system is also conducive to the distribution of fibers between the z, thereby increasing the ring pressure strength.

6, strong drying will help improve the ring pressure strength

According to the characteristics of the production of corrugated paper, determine and control the drying curve, and appropriately increase the surface temperature of the dryer. In addition, during the operation of the paperboard, tension should be maintained, lateral contraction should be reduced as much as possible, and the ring pressure strength can also be improved.

Seven, control the moisture of cardboard

Generally, the ring pressure strength decreases with the increase of water content. Therefore, the water content of the cardboard should be strictly controlled. Generally, the control is 7%-9%.

(Wen/Zhong Shuchun)

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