Control Technology of Adhesion Poor in Four-layer Corrugated Paperboard

The four-layer corrugated cardboard has a layer of corrugating medium in the corrugated medium, and a layer of glue is also applied between the two layers of corrugated medium to increase the hardness and thickness of the double-layer corrugated medium after drying. The strength of three-layer corrugated board more than doubled.

1. Four-layer corrugated board adhesive points

(1) When corrugated paper is compounded, the coating glue will increase the water content of the corrugated core paper, and after the adhesive is dried, it will prevent the embrittlement of the corrugated medium. Therefore, the water content is small, the permeability is low, and the uniform coating is easy to choose. Corrugated paper composite adhesives are critical.

(2) On the premise of satisfying the post-composite bonding strength, the principle of the gluing amount is as small as possible.

(3) It is also important to control the humidity of the composite corrugated medium before pressing the corrugated medium. Humidity not only affects the molding, but also causes debonding during compounding; when the humidity is too low, the peak will be embrittled and broken when the corrugation is bent.

(4) The corrugated type of four-layer corrugated cardboard should be specially designed and calculated by a professional roll company based on the thickness of two layers of corrugated paper and a layer of glue to produce an ideal corrugated cardboard.

(5) When processing four-layer corrugated cardboard on a vacuum suction type single-sided machine, attention should be paid to adjusting the adsorption system (position, clearance, and air volume of the suction hood and corrugating roll) and the heating system; the composite corrugated medium must have higher requirements. The temperature can transfer heat to the peak and meet the gelatinization temperature requirement. The thicker corrugated core paper will increase in hardness, and it will be easily removed from the corrugating roll after forming, affecting the gluing and compounding, resulting in high and low defects, collapses, degumming, and “wood ear” quality problems. Therefore, it is necessary to have enough air volume for adsorption. With negative pressure and heating temperature, it can ensure smooth coating after the corrugated board is formed.

2. The relationship between speed and cardboard quality

(1) The ideal adjustment speed should be the most stable and economical speed of the production line.

(2) The strength and humidity of the paper should be suitable for the speed of the vehicle.

(3) The fluctuation of the vehicle speed will affect the humidity control of the paper. The more stable the vehicle speed, the more stable the humidity control of each layer of paper, and the more stable the quality of the paperboard, a good heating system is necessary.