In Europe and America, the most important one for checking the quality of corrugated cartons is the inspection of the width of the viscose glue line of corrugated cardboard. The standard sizing is precisely positioned, the adhesive is applied evenly and smoothly throughout the peak, the paste lines are clearly outlined, and no adhesive is ejected laterally from the corrugations, leaving no trailing glue marks.
The bad sizing is mainly related to the equipment state, adhesive quality, and quality of the base paper of the corrugated cardboard production line. The common quality problems caused by poor sizing mainly manifest in the following aspects:
1. There are dirt on the rubber roller, such as paper scraps, starch agglomerates, and other foreign materials, or foreign materials on the roll surface are blocked, resulting in the gluing roller can not be gluing, can only pass a small amount of adhesive, And it is easy to be wiped off. When the glue is applied, there will be insufficient glue on the peak, and intermittent gluing will occur. The surface of the corrugated paperboard will be marked with layers of paper and core paper, and the compressive strength, side pressure strength and adhesive strength of the carton will be reduced.
When the gap between the upper and lower corrugating rolls is too wide, the upper roll cannot contact the lower corrugated roll and there is not enough adhesive on the corrugation peak.
2. Adhesive lateral ejection phenomenon Adhesive viscosity is too high; too low or too high content of borax inside, the prone to lateral spraying of adhesive when the production line is running at a high speed, which will cause cardboard warping or paperboard softness, carton The bond, side pressure, and compressive strength are all reduced.
