How the Glue Affecting the Pre-Pressing Effect of Plywood
The properties and application of adhesive play a crucial role in the pre-pressing effect of plywood. The details are as follows:
1. Initial Viscosity
· Impact: Higher initial viscosity results in stronger adhesion between veneers and allows for shorter pre-pressing times in plywood production.
· Improvement Measures: Adding a certain amount of polyvinyl alcohol to urea-formaldehyde adhesive can enhance its initial viscosity, thereby improving the pre-pressing effect.
2. Formaldehyde Content
· Impact: Glues with higher formaldehyde content have better bonding strength and durability, leading to improved plywood pre-pressing results.
· Environmental Requirements: Environmentally friendly adhesives, which have lower formaldehyde content, often require longer pre-pressing times, potentially affecting production efficiency.
3. Curing Agent
· Impact: Higher amounts of curing agent accelerate the curing process, significantly enhancing the plywood pre-pressing effect.
· Control: The amount of curing agent should be properly controlled to avoid overly rapid or uneven curing.
4. Flour
· Function: Adding flour during adhesive preparation not only acts as a filler but also increases the viscosity of the adhesive, thus improving the plywood pre-pressing effect.
· Precautions: The amount of flour added should be appropriate to avoid negatively affecting the flow and penetration of the adhesive.
5. Glue Spread Amount
· Impact: A larger amount of glue improves penetration and bonding strength, enhancing the pre-pressing effect.
· Issues: Excessive glue application may lead to:
o Increased water content introduced by the adhesive, causing the veneers to become saturated and negatively affecting the pre-pressing results.
o Waste of adhesive or slippage between veneers.
· Optimization: The glue spread amount should be adjusted based on the material properties of the veneers and the requirements of the pre-pressing process to balance penetration and water content.
These factors must be comprehensively adjusted according to specific conditions in actual plywood production to ensure stable plywood pre-pressing effects and production efficiency.
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