Many manufacturers focus exclusively on the wet section's injection metering, believing that as long as the ratio is accurate, everything is fine. But that's not the case. The foaming reaction is a complex exothermic chemical process. The task of the drying section (also known as the curing section) is to provide a stable thermal environment that allows the foam's internal structure to fully cross-link while removing excess volatile substances from the surface.

1. Impact on Product Quality (Deformation & Shrinkage)

If the temperature distribution in the drying section is uneven, or if the air duct design is inadequate, the two sides of the foam board will cure at different rates. What are the consequences? Board warping (bowing into a banana shape), inconsistent surface hardness, and even noticeable shrinkage after six months of storage at the customer's site. In the case of refrigerator doors, shrinkage leads to poor sealing, which ultimately results in scrapping of the entire unit.

Our Experience: Multi-point independent temperature control combined with a through-flow air circulation design (such as Kinte-Weijia's patented technology) is essential to ensure minimal temperature differentials across any cross-section, regardless of the production line's length.

2. Impact on Energy Consumption (Operating Costs)

The drying section typically accounts for the largest share of energy consumption on the entire foaming line (heating + moisture extraction). Many older production lines, in pursuit of higher speeds, set temperatures too high or exhaust excessively, leading to significant heat loss.

The Solution: Modern drying section designs (like the one we promote) focus on "thickened insulation layers" and "variable-speed moisture extraction." By using algorithms to determine the actual heat required by the material, the system dynamically adjusts air volume and heating power. For a typical medium-sized production line, an optimized drying section can save several hundred thousand RMB in electricity costs annually.

3. Industry-Specific Design Considerations

• Home Appliances (Refrigerators/Freezers): The drying section needs to be longer – a slower process yields better results – to ensure the flatness of the hinge mounting surfaces on door bodies.

• Building Materials (Sandwich Panels): Requires high temperature and high speed to improve demolding efficiency.

• New Energy Batteries: For thin-sheet foam components, the drying section must be equipped with high-precision tension control to prevent the thin sheets from breaking.