Since edge sealing of boards is so important, what should we pay attention to when sealing in winter?

Many people buy good boards, but ignore the edge banding step during the furniture customization process. However, this step is not only indispensable, but also crucial for furniture manufacturing, such as wardrobes. Its quality can not only affect the service life and environmental performance of wardrobes and other furniture, but also affect the overall texture and beauty.

So what should you pay attention to during winter edge banding operations? What are the solutions? Let's take a look at the notes compiled by the editor!

Problem 1: Poor bonding

In winter, the temperature is low, and the lower ambient temperature absorbs part of the heat of the hot melt adhesive and shortens the open time of the hot melt adhesive. A film will form on the surface, causing false adhesion or poor adhesion. In this regard, the following countermeasures can be taken during edge sealing operations:

1. Preheat.

Ambient temperature affects the bonding strength. The boards must be preheated before applying glue and edge banding, especially in winter. Before edge banding, the boards should be placed in the workshop in advance to keep the board temperature the same as the workshop temperature.

2. Raise the temperature.

Based on the original set temperature, the temperature of the hot melt adhesive tank can be increased by 5-8℃, and the temperature of the glue coating wheel can be increased by 8-10℃.

3. Voltage adjustment.

Low pressure during edge banding in winter can easily create an air gap between the hot melt adhesive and the substrate, hindering optimal wetting and mechanical engagement between the adhesive and the substrate, resulting in false bonding and poor bonding. To address this issue, check the sensitivity of the pressure roller, the accuracy of the display instrument, the stability of the air supply system, and adjust the pressure appropriately.

4. Accelerate.

Appropriately increase the edge sealing speed to avoid exposing the hot melt adhesive to cold air for too long.

Problem 2: Edge collapse and degumming

Hot melt adhesive and edge banding are both significantly affected by temperature. Cold shrinkage is more likely to occur at lower temperatures, and they further harden as the temperature drops, generating internal stress at the bonding interface. When the impact of the slotting tool acts on the bonding interface, this internal stress is released, causing edge chipping or debonding.

To address this issue, we can start from the following points:

1. The plate temperature can be adjusted to above 18°C ​​during slotting to allow the soft elastic hot melt adhesive to alleviate the impact of the tool;

2. Change the direction of tool rotation so that the tool impact force acts on the edge banding surface;

3. Reduce the slotting speed and sharpen the slotting tool frequently to reduce the impact force of the tool.

Question 3: “Brushing”

In winter, the temperature difference between indoor and outdoor temperatures is large, and air convection can cause temperature fluctuations, making stringing more likely to occur (when sealing with transparent adhesive). Additionally, stringing can occur if the temperature is too high (low) or the amount of adhesive applied is too large. It is recommended to adjust the temperature according to the temperature and the condition of the machine.

Although edge banding is small, it cannot be ignored. Today’s precautions are explained here. See you next time.