When wood is painted before it reaches an appropriate moisture content balance with the local environment, it often results in poor coating quality, affecting color and luster, and causing defects such as bubbles and whitening. The coating may not adhere properly, and post-painting wood expansion and contraction can lead to cracking and peeling of the coating. Specific impacts include:
1. Significant Impact on Color:
High moisture content in Guangzhou's wood pallets can affect the wood's coloring, as changes in moisture content lead to shrinkage and discoloration of the coating, resulting in faint colors.
2. Factors Affecting Paint Adhesion:
High moisture content wood from Guangzhou, as the moisture is desorbed, the coating will crack, swell, and peel, resulting in poor adhesion.
3. Facilitate fungal propagation:
High moisture content can lead to the proliferation of saprotrophic, mold, and discoloration bacteria, resulting in decay and damage to wood products.
4. Formation of wooden products deformation:
Due to their high moisture content, painted wood products can still transfer moisture with the outside environment, leading to warping and deformation of the products as they shrink, which can cause damage to the coating and the wood products.
5. White Coating on Wet Coating Caused
The wood board, when dry and defective, allows moisture within the wood to enter the coating due to the effect of moisture evaporating into the thinning agent, resulting in a bleaching appearance. The inability to release the moisture also affects the transparency of the paint due to its mist-like impact.
Bubble:
Due to the reaction of polyurethane paint with moisture, gases are produced, which can lead to the formation of bubbles and defects in the coating film as they escape.
7. Influence on Coating Drying and Curing
Due to the high moisture content in the wood, the contact surface between the coating and the wood is in a humid condition, affecting the evaporation of the thinner and the cross-linking reaction between the resin and the hardener, thereby also impacting the drying speed and proper curing of the coating.Not dry or dull entirely.
