Double-sided machine - lack of glue

As shown in the figure below, the sizing amount is obviously insufficient. The final result is that the cardboard adhesive strength is too weak, and the cardboard edge pressure strength and carton compressive strength are too low. The reason may be that the distance between the metering roller and the paste roller is too small, the viscosity of the paste is too low, or the rubber roller is plugged in the cell, so the amount of glue is insufficient.