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Many hardcover book and magazine factories are most concerned about weak adhesion and cracked book covers when making kraft paper covers. Hot melt adhesive particles, as the mainstream adhesive material for book binding, are fully capable of bonding kraft paper and cover paper. The key lies in selecting the right model and controlling the adhesive coating process.
The surface of cowhide cardboard is relatively rough and the fibers are loose, making it more permeable compared to copperplate paper. The medium to high viscosity EVA model in Sunlife hot melt adhesive particles has a moderate opening time and can fully penetrate the gaps between cardboard fibers to form mechanical anchoring. The bonding strength far exceeds the national standard requirement of ≥ 2.5N/cm.
Q: Is the delamination of cowhide cardboard book shells a problem of glue or a process issue?
A: Both are possible. First, check if the glue application is uniform (recommended 80-120g/m ²), and then confirm if the milling depth meets the standard. If the process is normal and still debonding, using a higher viscosity Sunlife hot melt adhesive particle model can improve the situation.
Q: Is there any special requirement for bonding the cover paper with kraft paper, which is matte powder paper?
A: The surface of the matte paper has a coating and slightly poor wettability. It is recommended to choose hot melt adhesive particles with high initial adhesion and increase the coating temperature by 5-10 ° C to enhance penetration.
Q: Does high environmental humidity have an impact on bonding?
A: Has an impact. After moisture absorption, the moisture content of cowhide cardboard increases, which will reduce the bonding strength. It is recommended to control the humidity in the workshop at 40-65% RH, and the moisture content of the cardboard should be 8-12%.
< p > on < a href = "http://www.sunlife888.com" > < strong > hot melt adhesive books < / strong > < / a > how to use, through the following questions can help you go less detours: < / p > What application device is used? Binding equipment is usually installed and in use, […]
During the use of hot melt adhesive, many customers have reported that the glue does not stick. Therefore, most users will encounter various troubles in the production process because they do not have a deep understanding of hot melt adhesive. Below is a detailed introduction on how to improve the bonding strength of hot melt […]
What should I do if the hot melt adhesive particles are not firmly attached to the coated paper? Direct answer: The root cause of the poor adhesion of laminated paper is mostly due toLow membrane surface energy, glue not eating paper fibers, poor coordination between opening time and compressionThese three points. The surface of laminated […]
The quality of book binding often depends not only on the equipment and paper, but also on the binding adhesive. If a book experiences problems such as page dropping, glue peeling, stiff spine, uneven flipping, and low-temperature brittleness, it is often related to the choice of binding glue, glue temperature, paper type, and process compatibility. […]
