When there is a problem of weak adhesion during the sealing of color boxes, how can we solve it? First, consider all aspects such as the bonding material, the performance of hot-melt adhesive, the performance of box sealing equipment, and environmental factors. Only by finding the cause can we solve the problem well. Here are some common reasons that cause weak adhesion of hot-melt adhesive for color box seals. I hope it will be helpful to everyone.
1. The equipment line speed does not match the curing speed of hot-melt adhesive.
There is a certain time period from the start of applying hot-melt adhesive to its complete cooling and drying. This time period is the open time of hot-melt adhesive. If the line speed of the box sealing equipment does not match the curing speed of hot-melt adhesive, and the glue has dried halfway or even completely. At this time, if sealing is performed, the seal of the color box will definitely not be well adhered.
2. The surface material of the color box is not easy to bond after treatment.
The surface of color boxes is usually printed with various patterns and has been processed by various techniques. This is equivalent to adding a protective layer on the paper surface. When we apply glue and seal it again, it is a test of the performance of hot-melt adhesive. The glue needs to break through the protective layer on the surface of the carton and have a certain degree of penetration to bond firmly.
3. The performance of hot-melt adhesive does not meet the requirements.
Check whether the hot-melt adhesive is completely melted. Has repeated heating and use led to the aging of the glue solution? Has the glue pot not been cleaned for a long time, resulting in many impurities? These factors that affect adhesion should be eliminated one by one. Remember, it is very important to make the hot-melt adhesive reach its due performance! But after eliminating various factors, if it is still impossible to seal, consider replacing it with another hot-melt adhesive with better performance to deal with this kind of color box.
4. The environmental temperature causes changes in the physical properties of hot-melt adhesive.
Hot-melt adhesive is relatively sensitive to temperature. No matter in what state it is, its physical properties will also change with the change of environmental temperature. However, at the research and development stage of each hot-melt adhesive, the acceptable range of environmental temperature has already been taken into account. It is not the case that a little temperature change will make it very unstable or even directly lead to cracking and degumming of the adhesive layer. However, when the weather is changeable and the temperature difference is too large, the same hot-melt adhesive may not be applicable when applied to the same color box. When encountering the problem of unsealable, it is also necessary to change the hot-melt adhesive model for use.
There must be a reason for the weak adhesion of color box seals. Knowing the reason will lead to corresponding solutions. It is not that once there is weak adhesion, it is considered that the performance of hot-melt adhesive is not good. Although the purpose of hot-melt adhesive is to bond things, the entire sealing effect is not determined by hot-melt adhesive alone. We cannot be preconceived when a problem occurs. If you still have any questions during the use of hot-melt adhesive, please contact us through the contact information below. Banglin Hot Melt Adhesive provides you with the best solution.