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1, the formation of reason for the face paper and single-sided corrugated cardboard coupling process, the adhesive coating is not good, squeezed to the top of both sides of the adhesive adhesive excess, in the process of adhesive drying, resulting in facial paper Shrinks form on both sides of the peak. Therefore, at the time of turning on the veneer, it is necessary to check the amount of adhesive applied at any time. If there is a very thin line on the paper, the glue is in the best condition. As shown in Figure 2a, the phenomenon of see-saw will not occur; If there are heavy double lines, it indicates that the amount of glue applied is too large. As shown in Figure 2b, the see-saw phenomenon will occur. Low-quantity pasta papers are more serious.
2. Solution If there is a seesaw phenomenon, it can be controlled by the following methods:
(1) The easiest and most reliable method is to replace the high-quantity noodle paper, which can significantly eliminate the see-saw phenomenon, but this will increase the cost and make the price of the carton significantly higher. If the user can accept it and use it, if it is unacceptable, consider using other methods.
(2) Improve the viscosity of corn starch adhesives, from 100ML 60S to 70-90S, to reduce the amount of gum on the back of the peak, which can significantly reduce the seesaw phenomenon, and the cost does not change much.
(3) When using low-density and dry tissue paper, if the amount of glue is too much, it is prone to see-saw phenomenon. The wetting method (hanging, inverting, humidifying, etc.) can be used to make the paper absorb a certain amount of moisture. ,reuse.
(4) Adjust and control the parallelism and clearance between the applicator roller and the pressure roller. The gap should be moderate, generally just after the corrugated board passed. Strictly control the pressure between the pressure rollers to reduce the occurrence of jaws.
(5) The most basic and effective method is to make full use of the horizontal and vertical texture characteristics of the paper. Longitudinal filaments of the tissue paper are aligned with the direction of the corrugated fiberboard, and the phenomenon of seepage is eliminated, as shown in FIG. 3 . However, the paper is sometimes wasted because the width of the web does not match the size of the paper tray, increasing the cost.
3, summary of the above shallow point of view, may be "a hole of vision", hoping to throw in bricks, to contribute to the improvement of the level of packaging technology.
Color printing corrugated paper boxes play an important role in product packaging. Because of the non-pollution of such packaging, meeting the requirements of environmental protection, and low cost, they are increasingly favored by businesses. We are a company that produces color-print corrugated cartons. In the production process of color boxes, color-printed face papers that are bonded to single-faced corrugated paper sometimes create a wrinkle that is recessed inwards and resembles a panel, as shown in Figure 1. . This phenomenon appears, one is unsightly; the second is the user is not satisfied with the phenomenon of return, affecting the efficiency of the company; three on the strength of the carton, thickness and other effects. Here is an overview of the causes and solutions.