1. Bubbling and local degumming
Causes:
1. The moisture content of the veneer is too high or the drying is uneven
2. The amount of glue applied is too large
3. The pressure reduction speed is too fast or the hot pressing temperature is too high
4. The degree of resin condensation is not enough
5. Insufficient hot pressing time
Solution:
1. Control the moisture content of the veneer within the range of 8 to 12%
2. Control the amount of glue applied Comply with process requirements
3. The second stage of pressure reduction should be slow and the hot pressing temperature should be appropriately reduced
4. Check the resin quality
5. Extend it appropriately Hot pressing time
2. Low bonding strength or degumming
Causes:
1. Poor glue quality
2. The amount of glue applied is insufficient or the glue is applied unevenly
3. The aging time is too long, the glue has dried or the aging time is too short, and the glue does not form a continuous film
4 , The pressure is insufficient, or the temperature is too low, or the hot pressing time is too short
5. The burr grooves on the veneer are too deep, and the peeling quality is poor
6. The moisture content of the veneer is too high High
Solution:
1. Check the glue quality
2. Pay attention to the moderate and even amount of glue applied
3. Mainly control the aging time
4. Appropriately increase the pressure and temperature, or extend the hot pressing time
5. Improve the quality of veneer peeling
6. Control The moisture content of the veneer does not exceed the specified range
3. Glue penetration
Causes:
1. The quality of the veneer is too poor and the cracks on the back are too large
2. The glue is too thin or the amount of glue applied is too large, and the aging time is too short
3. The hot pressing temperature is too high or the pressure is too high
Solutions:
1. Improve the quality of the veneer and reduce the depth of the cracks on the back
2. Increase the glue concentration, reduce the amount of glue applied, and extend the aging time
3. Reduce the hot-pressing temperature or reduce the unit pressure of hot-pressing
Baijia Chemical's formaldehyde-free hot-pressing adhesive can be adjusted accordingly according to the customer's specific process conditions. Hope I can help you.