新闻中心
If you are a packaging manufacturer, you may want your box and carton sealing process to be efficient, effective, and worry free to keep your production line running. However, if the packaging hot melt adhesive fails to fully bond the corrugated paper substrate, attempting to identify the root cause of the problem may be frustrating and time-consuming.
Here are five reasons why packaging hot melt adhesive cannot bond substrates together:
1.PressurizationIncorrect time
The sealing, pressurization, or application of force between the shell and the cardboard box is the key to achieving successful bonding. If you encounter adhesive failure, it may be due to incorrect pressurization time. This means that sufficient downforce cannot be applied and the adhesive cannot fully penetrate the substrate. It is necessary to apply the correct level of pressure to achieve proper adhesion without affecting the performance of the substrate.
2. Application temperature needs to be adjusted
In colder months, the temperature of the corrugated substrate itself may be low enough to cure the packaging hot melt adhesive too quickly during the production process before you are ready to bond. Ensure that your substrate and adhesive are at the ideal temperature level for sufficient curing time.
3. Adhesive properties have been altered
If the performance of your packaging hot melt adhesive changes due to thermal degradation or oxidative degradation, your substrate is likely to fail to bond. This is because this change can cause carbonization, where the adhesive hardens and does not flow onto the substrate.
4. Adhesive cannot fully wet
Nowadays, many corrugated packaging substrates use highly recyclable ingredients, which leads to shorter paper fibers. These shorter paper fibers will make it difficult for the packaging hot melt adhesive to fully wet and achieve adhesion. If you encounter adhesive failure when using highly recycled corrugated paper, consider using adhesives specifically formulated for challenging substrates.
5. Uneven glue flow
When using a nozzle to apply packaging hot melt adhesive, uneven flow can cause the adhesive to fail. Some areas may have too much or too little adhesive. Ensure that your nozzle is compatible with the selected adhesive, so that an appropriate amount of adhesive flows through and is consistently dispensed each time.
Why do hot melt adhesive particles emit a lot of smoke during the heating process? When using hot melt adhesive, its viscosity can only be affected by heating. The hot melt adhesive equipment used in industry cannot do without a heating system. Sometimes, there may be a large amount of abnormal smoking during the heating […]
Compared with traditional EVA hot melt adhesive and other adhesive chemicals, EVA hot melt adhesive has many advantages. Let’s briefly understand some of the advantages of EVA hot melt adhesive. We like hot melt adhesive for a reason. What are the advantages of EVA hot melt adhesive 1. Excellent heat resistance: It can usually replace […]
In the wireless adhesive packaging process of books, the uneven thickness of the adhesive wire is a quality problem frequently encountered by printing factories and graphic and text fast printing factories. One side of the adhesive layer is too thick and overflowing, while the other side is too thin and debonding. This not only makes […]
Direct answer: EVA hot melt adhesive granules are used for book and magazine packaging, and the glue pot is generally set at 160-180 ℃; The packaging and sealing scenarios are mostly between 150-170 ℃; The recommended construction temperature provided by the rubber particle manufacturer shall prevail, and the fluctuation should not exceed 10 ℃. The […]
