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Urea Formaldehyde Resin Adhesive Powder from China Suppliers - High-Quality Factory Production
Urea-formaldehyde resin powder
1. Usage method & Glue mixing ratio
- Urea-formaldehyde resin powder : water (weight ratio)
- 100 parts : 40-60 parts
2. Board pretreatment
- Select high-quality boards, and adjust the moisture content of the boards to 8-12%.
- The surface of the board must be smooth and flat. Convex bulges, concave holes, and cracks on the surface must be repaired. The surface of the adherend must be oil-free and dust-free.
- The thickness accuracy of the board is controlled within ±0.08mm.
- Boards with a cured but unpressed glue layer cannot be directly coated with glue for a second time and must be sanded before use.
3. Glue mixing process
- Dissolve the glue powder in water according to the above water ratio and stir it into a uniform liquid. The suitable water temperature is 15-30℃. In winter, hot water can be used to mix the glue to reduce clumping. (Must be stirred with a mixer for 5-10 minutes until it is uniform and free of particles before use).
- H01 drying agent is mixed according to the temperature.
4. Gluing process
- Standard glue coating amount: 200-230g/m². Small glue lines on both sides are the best, ensuring no lack of glue.
- The stacking time of the boards after glue coating shall not exceed 30 minutes. When the temperature is high, the stacking time shall be shortened. It is strictly forbidden to blow fans directly on the stacked boards after glue coating.
- Do not use foaming glue.
5. Pressurization time
- Refer to standard operating procedures for specific pressure duration requirements.
6. Curing
- After the pressurization time is reached, the press can be unloaded and removed, but the boards must be stacked for 24 hours before entering the next process.
- If the strength is to be tested, it needs to be cured for more than 72 hours.
*Especially for the glued products that will be subjected to intense vibration in the next process, such as sawing, sanding, drilling, etc., the necessary curing time is an indispensable process to ensure product quality.
Frequently Asked Questions (FAQ)
Q: What is the correct mixing ratio for Urea-formaldehyde resin powder?
The correct weight ratio is 100 parts of Urea-formaldehyde resin powder to 40-60 parts of water.
Q: What is the ideal moisture content for the boards before applying glue?
The moisture content of the boards should be adjusted to between 8% and 12% for optimal adhesion.
Q: How long should the glue mixture be stirred before use?
It must be stirred using a mixer for 5 to 10 minutes until the liquid is completely uniform and free of any particles.
Q: What is the recommended glue coating amount?
The standard glue coating amount is 200-230g/m². It is best to have small, consistent glue lines on both sides without any dry areas.
Q: How long should the boards be cured before further processing?
The boards must be stacked for at least 24 hours after pressing. For products undergoing intense vibration processes (like sawing, sanding, or drilling) or strength testing, they must be cured for more than 72 hours.