Many users face bubbles in the middle after veneer pasting due to improper operation. This guide provides tips on how to avoid this common issue and achieve a smooth finish.
The best choice for veneer is a hot press machine.
Tips to Avoid Bubbles During Veneer Pasting
1. Optimal Temperature: Confirm the best temperature with your glue supplier. Some glues work best at 70 degrees, while others require higher temperatures.
2. Adequate Pressure: For a 4X8 door panel, the pressure should be around 80 tons. Adjust based on your specific requirements.
3. Correct Timing: The pressing time varies with glue type and conditions. High pressure and temperature reduce pressing time, while lower temperature increases it, ranging from three to six minutes.
4. Suitable Glue: Choose glue that matches your veneer type and working conditions. Water-based glues often cause bubbles due to wood cell swelling from water absorption.
5. Proper Handling: Extend pressing time, increase pressure, or adjust glue to prevent foaming. Use a hot press machine for best results. If budget is a concern, a cold press machine is an alternative, but it requires careful handling to avoid bubbles.
Causes of Bubbles
- Excess Adhesive: Too much glue can cause bubbles.
- Low Shop Temperature: Ensure the shop temperature is above the minimum glue use temperature.
- Extended Pressing Time: Avoid pressing the panel for too long.
- Insufficient Pressure: Ensure adequate pressure during pressing.
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If have limited budget, can also consider use a cold press machine.
Cold press veneer requires high pressure, high flatness, and also pay attention to the flatness of the substrate.
Few points may cause these bubbles:
- Too Much Adhesive
- Shop Temperature below the minimum glue use temperature
- Pressing the panel for too long
- inadequate pressure while the panel is being pressed.
Most cold press veneer glues are water-based. Bubbles and ripples are caused by the swelling of wood cells in the veneer due to the absorption of water content from the adhesive.
