The core secret of high-quality PVC foam board lies in the uniform and fine pore structure inside. To achieve this ideal structure, PVC processing aids are very important additives. It does not directly participate in foaming, but creates a perfect physical environment for the birth, growth, and stability of bubbles by modifying the PVC melt itself.

The core function of PVC processing aids (usually ACR type) is manifested here: they intertwine with each other through long molecular chains, greatly increasing the strength and elasticity of the melt (melt viscosity).

With a strong and resilient melt, the next step is to precisely control the "birth" and "growth" of bubbles. Processing aids play the role of "precise regulators" in this process. And under the action of processing aids, the viscoelasticity of the melt increases, and its ability to withstand tensile deformation is stronger. This allows more micro bubble nuclei to be generated and expanded simultaneously and equally, rather than a few bubbles overgrowth.

The most dangerous stage after the successful nucleation and expansion of bubbles is the mutual merging (merging) of bubbles and the collapse before cooling. At this moment, processing aids have become the "guardians" of the pore structure. The high-strength and highly elastic three-dimensional network structure it constructs forms a sturdy 'barrier' between adjacent bubbles.

The excellent efficacy of PVC processing aids is not achieved in isolation. It creates a strong and uniform melt environment, allowing the decomposition gas of foaming agents to be more efficiently and fully utilized. PVC processing aids enhance melt strength, promote homogeneous nucleation, and prevent cell coalescence, ultimately creating a stunning world of uniform and fine cells inside PVC foam boards.

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