Many furniture factories encounter a headache during the edge sealing production process: the board surface is always dirty. Especially during PUR edge sealing, there are often issues such as flying glue, wire drawing, and residual adhesive boards, which not only affect the appearance of the product but also increase the cost of manual cleaning and rework.
Many masters' first reaction is that the glue is not good, but in reality, the problem of dirty boards is often not only caused by the hot melt adhesive itself, but also by multiple factors such as equipment, process, and parameters. Today, Minli Hot Melt Adhesive will share with you several common reasons based on actual production experience.
1. Excessive glue application temperature can easily cause wire drawing and glue flying
This is the most easily overlooked issue for many factories.
PUR hot melt adhesive has strict temperature requirements. If the temperature of the glue pot is set too high, the fluidity of the gel will become stronger, and it is easy to cause wire drawing and glue flying during the edge sealing process, which will eventually lead to adhesive adhesion on the surface of the board.
Under normal circumstances, different models of PUR hot melt adhesive will have corresponding recommended application temperatures. It is recommended not to adjust the temperature solely based on experience, but to adjust it according to the adhesive properties and equipment status.
Additionally, it is necessary to check the rebound pressure of the glue pot. If the rebound is too tight, it is also easy to squeeze out excess glue, causing contamination of the board edge and surface.
2. Excessive glue application causes the glue to be squeezed out of the surface of the board
Some factories tend to increase the amount of glue applied in order to achieve strong adhesion, but the more glue applied, the better.
When the amount of glue applied is too large, excess glue will be directly squeezed onto the surface during the pressing process, which not only affects the appearance but also easily causes adhesion during subsequent stacking of boards.
In fact, the appropriate thickness of the adhesive line can ensure the bonding strength and reduce the problems of glue flying and dirty boards. Suggest making appropriate adjustments based on the thickness of the board, edge banding, and weather conditions.
3. The scraper is not in place, and residual glue is easily carried to the surface of the board
It is common for the scraper to wear out after using edge banding equipment for a long time.
If the scraper is not adjusted properly or has already worn out, it will not be able to clean the excess hot melt adhesive in a timely manner, and the residual adhesive will be carried to the surface of the board as it runs.
Many times, workers only focus on the glue pot and temperature, but overlook the small detail of the scraper. In fact, a small scraper state often directly affects the edge sealing effect of the entire line.
4. If the polishing wheel is not replaced for a long time, the more it is polished, the dirtier it becomes
After prolonged use, the polishing wheel will leave a large amount of hot melt adhesive and dust.
When continuing to use, it not only fails to clean, but also brings residual glue back to the surface, causing it to get dirtier as it is thrown away.
Therefore, it is recommended to regularly check the condition of the polishing wheel and replace it promptly if it has hardened or accumulated glue, which can significantly reduce the problem of surface contamination.
5. Inappropriate selection of PUR hot melt adhesive
Different PUR hot melt adhesives have differences in opening time, curing speed, and temperature resistance.
If the curing time is too slow, the colloid is prone to adhere to dust before fully curing, or cause secondary pollution during transportation.
Therefore, choosing PUR hot melt adhesive with better stability and faster curing can effectively reduce glue flying and dirty board situations, while also improving production efficiency.
Minli Hot Melt Adhesive has been focusing on furniture edge sealing hot melt adhesive for many years. In response to common problems such as glue flying, wire drawing, and dirty boards in the PUR edge sealing process, we continuously optimize product construction performance, help furniture factories reduce manual cleaning, and improve production efficiency.
If you often encounter dirty board problems in edge sealing production, please feel free to communicate with Minli Hot Melt Adhesive. We can provide targeted adhesive suggestions based on equipment and process conditions.