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Surface hardness on a PVC Foam Board Production Line depends on two main things: the recipe and the processing. The resin grade, foaming agent, and filler load set the starting point. Temperature profile, cooling rate, and screw speed then decide how much of that starting point the surface actually keeps. The manufacturing process matters here because the skin forms and sets within seconds at the die and the cooling rolls. Small changes in either area show up fast as soft or uneven faces. This guide breaks down the recipe factors, processing settings, equipment design, and adjustment steps that let production teams tune hardness on a PVC foam sheet board extrusion machine production with confidence, whether the goal is a hard crust face for a print-ready PVC advertising board line for display or a softer free foam sheet.

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