Due to improper quality and quantity of the honeycomb cardboard adhesive, or due to the脆ification of the adhesive layer caused by excessive drying temperature, there is poor adhesion between the upper and lower layers of paper, resulting in large areas of separation. This issue can be overcome by adjusting the adhesive formula and type, or by modifying the drying process.
2. Issues such as insufficient adhesive application or excessive height deviations, as well as poor operation of the pressure roller, can lead to good bonding on the cardboard's bottom surface but extensive delamination when the face paper is torn by hand. Improving this situation involves inspecting the operation of the adhesive coating unit, adjusting the core paper feeding mechanism appropriately, and checking for height deviations in the honeycomb core layer.
3. When corrugated paperboard is bent, there is a phenomenon of upper layer cracking and lower layer peeling and splitting. This can be adjusted by modifying the adhesive formula and type, and appropriately reducing the drying temperature of the honeycomb paperboard.
Due to poor quality of core adhesive, low peel strength, improper tensile ratio, or improper processing, there are many holes in the honeycomb core layer during the manufacturing process, leading to fractures during stretching. Choosing better raw paper, adjusting the stretching process, and opting for core adhesive with high peel strength can improve this situation.
5. The honeycomb paperboard is prone to deformation and localized bubble formation due to excessive moisture content in the adhesive or incomplete drying, as well as poor venting in the core layer and high moisture content in the base paper. This can be controlled by using adhesives with lower moisture content, higher solid content, and quick drying properties, as well as by regulating the moisture content of the base paper.
6. Insufficient basis weight or不合理 core layer parameter design can lead to insufficient face hardness in honeycomb boards, resulting in noticeable indentation when pressed by hand. Selecting raw paper that meets the main performance indicators can improve this issue.
7. Due to the warping and deformation of fiberboard when absorbing moisture, or due to the impracticality of the composite process, the internal stress during the molding process was not eliminated, resulting in the side paper of the fiberboard and honeycomb board not adhering during the composite. This issue can be addressed by inspecting the main parameters of the fiberboard and further optimizing the composite process of the honeycomb paperboard.
Due to the misalignment of the original paper rolls, uneven tension during feeding causes the face paper to wrinkle. Adjusting the tension controller of the rewind stand and the guide roller can overcome this issue.
9. Due to the material of the honeycomb paper core, it may be difficult to pull apart and exhibit severe sticking. Adjustments can be made by checking if the moisture absorption of the honeycomb core paper meets the required standards.
10. Due to the waterproofing deficiency of honeycomb cardboard base material, excessive water absorption can weaken the face paper. After treatment with a waterproofing agent, finished honeycomb products may exhibit surface deformation and delamination. Opting for high-glue-content and good dimensionally stable honeycomb paperboard pulp, and ensuring the moisture content is not overly high when treating honeycomb products with water-based waterproofing agents, can all improve this issue.
