How to Get a Thin Glue Line in Edge Banding?
Thin glue line; It is achieved not only by using less adhesive, but also by keeping the panel and tape surface at the appropriate temperature, distributing the weight evenly, applying the correct pressure and adapting the viscosity of the product to the line speed. Bond strength should be verified prior to visual inspection.
The target in edge banding is a regular bond line that is invisible but provides sufficient strength. Although the thick trace is often attributed to a single reason such as "the product is too viscous", panel temperature, roller/nozzle setting, grammage, line speed, pressure and surface tolerance are effective together.
Causes that make the glue line thicker
- Panel or band being too cold compared to the production area
- Irregular application roller or dirty nozzle
- Higher weight than necessary
- Saw mark, dust or measurement deviation on the panel edge
- Inadequate or unbalanced printing
- Open not suitable for line speed time/viscosity
Adjustment order
- Clean the panel edge and tape backing, record their temperatures.
- Verify the actual glue temperature of the machine.
- Check that the roller or nozzle track is equal over the entire height.
- Change the grammage in small steps; Take samples with the same panel at each step.
- Check pressure rollers and belt alignment.
- Perform peeling and visual section control after cooling.
EVA or PUR?
While EVA hot melts offer fast and practical production, reactive PUR systems can provide advantages in applications requiring heat, moisture and chemical resistance. The decision should not be based solely on the appearance of the glue line. Compare edge banding adhesives, hot melt family and PUR products with application conditions. For EVA options Jowatherm 280.51 and 288.40; For PUR, TDS documents can be reviewed on Jowatherm PUR 605.65 page.
Quality control sample
| Inspection | What does it show? |
|---|---|
| Cross-sectional view | Line thickness and gaps |
| Peel test | Surface wetting and cohesion |
| Corner control | Alignment and pressure stability |
| Heat/humidity conditioning | Service condition resistance |
Regional production conditions
The temperature difference between the warehouse and the production area in Bursa, İnegöl, İstanbul, Kocaeli, Ankara and İzmir may affect the panel. Especially in winter, evaluate the first shift sample separately from the normal work sample. You can create a technical offer request for product selection and line testing.
How to Get a Thin Glue Line in Edge Banding? hakkında merak edilenler
Does reducing the amount of glue always make the line thinner?
It can refine the appearance; However, insufficient wetting and bond area may reduce the strength. Grammage should be determined by testing.
What is the cause of the white glue line?
In addition to product color, low panel temperature, thick application, printing and surface tolerance may also affect the appearance.
Can PUR be used on every edgebanding line?
The machine's suitability for PUR processing and controlled cleaning must be verified.
Why are there more problems on the first shift?
Cold panel, unsteady equipment temperature and adhesive sitting in the tank can affect the initial parts.
Technical resources and verification
The content has been prepared in Turkish with the technical experience of Koçak Endüstri, based on the following manufacturer resources.
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