How to improve the crush strength of corrugated base paper

Abstract: The ring pressure strength is a very important indicator in the process of packaging and use of corrugated paper. This article briefly explained how to increase the ring-press strength of corrugated medium in the production process, and the precautions during the use of the corrugated paper.

Keywords: corrugated base paper; ring pressure strength

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. However, with the international shortage of papermaking raw materials and factors such as environmental protection, the development of corrugated base papers to low-quantitative trends can save papermaking raw materials on the one hand, and on the other hand, businesses and manufacturers also have greater profit margins. However, for this reason, there are more and more problems exposed in the use of corrugated base papers, the most important of which is the ring-press strength of corrugated base paper.

Ring crush strength refers to a certain size of corrugated paper, inserted in the sample seat, forming a ring, compressed between the two measuring boards, the maximum force that can withstand before crushing. The ring pressure strength is the most important and most important quality index of the corrugated base paper in use. It largely determines the quality and grade of the corrugated base paper. In the following, how to control and improve the ring-crushing strength of corrugated base paper in the production process will be described. Several years of experience of the author will be elaborated to discuss with manufacturers and merchants.

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

(1) Use chemical additives, such as thickening agent.
(2) Control the pressurization of the press and calender. 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.

2 Properly selecting and matching the proportion of pulp Generally, in the 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 matched in proportion. As for the raw slurry, the types of raw materials for general pulping, the hardness of the slurry, and the uniformity of cooking have a great influence on the crush strength.

3 The control of the beating degree and the degree of tightness of the slurry have a great influence on the ring pressure strength, but the degree of beating is not as high as possible. The relationship between the degree of beating and the ring pressure strength is a parabola. High peak. The same tightness control of the ring pressure strength is similar to the effect 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. , And strictly controlled in production.

4 The concentration of Internet access generally does not affect other indicators. The concentration of Internet access should be controlled as large as possible, which will help improve the intensity of 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.

5 The speed of the pulp and the speed of the web influence the control of the speed of the pulp and the speed of the web so as to increase the proportion of the fibers distributed in the Z direction as much as possible. In addition, the use of a spray-type sizing system is also conducive to the distribution of the Z-direction fibers, 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 properly 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.

7 Control of the moisture content of cardboard paper Generally, the crushing strength of paperboard decreases with the increase of water content. Therefore, the moisture content of paperboard should be strictly controlled. Generally, it is reasonable to control it at 7-9%.

Zhong Shuchun, Inner Mongolia Saiwaixinghuazhang Paper

Source: Zhejiang Paper