Paint plays a crucial role in the post-processing of wood doors, significantly influencing the final appearance and usability. Additionally, paint costs represent one of the largest expenses in wooden door manufacturing. There are several types of paints commonly used, including phenolic, alkyd, polyurethane (PU), nitrocellulose, polyester (PE), and others. However, due to their poor film texture and adhesion, phenolic and alkyd paints have largely been phased out from modern decoration. Instead, nitrocellulose, polyester, and PU paints are widely used.
Nitrocellulose lacquer is popular among hand-decorated wood products because it's easy to apply manually. However, its thin film results in a less smooth finish and unsatisfactory aesthetics. PU paint, on the other hand, is easier to sand and reduces processing time. The downside is that its film tends to be softer, making it prone to white shadow dents from minor impacts. Adding at least one layer of PE paint can significantly reduce this issue. PE paint offers a hard film with strong hiding power, good transparency, and excellent ability to showcase the natural grain of the wood. Its drawback is that it’s difficult to polish, making the process more labor-intensive. As a result, many manufacturers avoid using PE paint.
Currently, 90% of wooden doors on the market use polyester paint, while a smaller number opt for PU. Both polyester and PU paints typically go through six stages: color matching, three coats of base, and two top coats. Some brands add additional steps like curing and waxing. Considering cost differences—nitrocellulose lacquer ranges from 8 to 15 yuan/kg, polyester from 18 to 28 yuan/kg, and PU from 43 to 65 yuan/kg—most manufacturers choose polyester paint due to its affordability and performance.
When selecting paint, there are eight key factors to consider:
1. **Physical Properties**: PU open paint has a thinner film, so some manufacturers neglect its physical properties such as impact resistance, hardness, and flexibility. A flexible paint film can withstand temperature changes without cracking. Low-quality materials may lead to poor performance.
2. **Drying Performance**: Open paint requires multiple processes, so faster drying times are preferable. While it's easy to improve dryness for standard open paint, achieving both fast drying and yellowing resistance is more challenging, especially for top yellowing-resistant options.
3. **Yellowing Resistance**: For light-colored or natural finishes, yellowing-resistant paint is essential. Ordinary open paint may not be suitable for these applications, and high-end products often require special top yellowing-resistant coatings.
4. **Clarity**: Transparent finishes demand high clarity to highlight the wood grain. Poor material compatibility can result in unclear films even if the paint looks clear before drying.
5. **Permeability**: Open paint must penetrate evenly into the wood. Poor wettability can cause uneven coverage, leading to an unsatisfactory open effect.
6. **Construction**: High-quality open paint should be applied using standard spraying methods without requiring special adjustments by workers.
7. **Grace**: Grace is an auxiliary product used to enhance clarity and depth in open finishes. It’s important to use compatible products to avoid issues like peeling or mold.
8. **Color Accuracy**: Colorants must meet environmental standards and offer good light resistance. Poorly formulated colorants may fade over time, causing color variation between products and reference boards.
Choosing the right paint is essential for achieving quality, durability, and aesthetic appeal in wooden doors. Always opt for reputable manufacturers to ensure long-term performance and satisfaction.
Plastic Packaging Tube,Plastic Packaging Tubes,Clear Plastic Retail Tubes,Clear Plastic Packaging Tube
NANTONG OUFEIYA IMP& EXP CO.,LTD , https://www.nantongoufeiya.com