How does resin shrinkage during cooling affect WPC armchair dimensions?

Resin shrinkage during cooling is a critical factor influencing the dimensional stability of Wood-Plastic Composite (WPC) armchairs. As the resin cools, it contracts, potentially causing warping, gaps, or misalignment in the armchair's structure. This shrinkage occurs because the polymer matrix in WPC loses volume as it transitions from a molten to a solid state.

The extent of shrinkage depends on the resin type, filler content, and cooling rate. For example, high-density polyethylene (HDPE) shrinks more than polypropylene (PP), while higher wood fiber content can mitigate some effects. Uneven cooling exacerbates the issue, leading to inconsistent dimensions and potential structural weaknesses.

To minimize these effects, manufacturers often use additives, precise mold designs, or post-cooling treatments. Understanding resin shrinkage helps in designing WPC armchairs with better durability and fit, ensuring long-term performance and customer satisfaction.