One common challenge encountered by label printing factories is the die-cutting of hot melt adhesive non-drying label materials. When processed on the same die-cutting equipment with water-based adhesive materials of similar external dimensions, waist width, and liner thickness, labels made of water-based adhesives typically run smoothly, while those made of hot melt adhesive materials often face issues. This results in reduced efficiency and increased waste for label printing factories, often requiring adjustments such as increasing waste width or switching to water-based adhesive materials.
Some have attempted to improve the die-cutting process of hot melt adhesive materials by altering the adhesive formula. While this has improved die-cutting performance, it has also led to a decrease in the initial viscosity of the adhesive, undermining the advantages of hot melt adhesives.
SailingLabel is here today to share insights on improving the die-cutting characteristics of hot melt adhesive non-drying label materials by adjusting certain positions on the die-cutting machine. We hope this information proves helpful to our readers. Stay tuned for expert tips on optimizing your die-cutting process for hot melt adhesive labels. #SailingLabel #DieCutting #HotMeltAdhesive #LabelPrinting”
Enhancing Die-Cutting Characteristics for Hot Melt Adhesive Labels.
The die-cutting characteristics of hot-melt adhesive self-adhesive materials can be improved by adjusting some stations of the die-cutting machine. The following summarizes the commonly used solutions by workshop workers for your reference.
Adjust the waste discharge angle of the paper edge
The smaller the waste discharge angle of the paper edge, the easier it is for label dropping. Increasing the waste discharge angle can reduce the friction between the paper edge and the label and improve the label-dropping phenomenon, see Figure 3 and Figure 4.
Install heating device on die cutting machine
Surface heating of the self-adhesive material after die-cutting can increase the viscosity of the adhesive, thereby increasing the release force of the self-adhesive material and improving the label drop phenomenon, see Figure 5.
Shorten the waste discharge distance and prevent labels from loosening and falling off.
Figure 6 shows two die-cutting machines. The upper die-cutting machine has a long waste discharge route and is prone to label dropping; while the lower die-cutting machine discharges waste immediately after die-cutting the self-adhesive material, and the label dropping phenomenon is greatly improved. Therefore, To shorten the waste discharge distance.
The label machine is equipped with a buffer roller device to improve edge breakage during label discharge.
The buffer roller can alleviate the tension change of the waste collection roller and improve the stress state of the paper edge. The upper die-cutting machine in Figure 6 does not have a buffer roller device and is prone to edge breakage due to the change in tension of the waste collection roller. However, the lower die-cutting machine has a buffer roller device, which greatly reduces edge breakage. Therefore, the die-cutting machine above must be modified to add a buffer roller device to improve the label breakage phenomenon.
Material pre-stripping reduces material release force and improves edge breakage
Figure 7 is a photo of the material pre-peeled. After the material is pre-peeled, the release force is reduced and the waste and edge breakage phenomenon is improved.
Increase the die-cutting pressure, cut off the adhesive, and improve the phenomenon of the label being peeled off together with the waste edge.
Figure 8 shows the emergency measures when the die-cutting roller cannot cut off the adhesive. Increase the die-cutting pressure by increasing the diameter of the bottom die-cutting roller to cut off the adhesive so that production can proceed normally. It is a good way to replace the qualified die-cutting roller. The knife buys time.