Supercritical sandwich polyaryletherketone foamed sheet and preparation method thereof

The invention provides a polyaryletherketone foamed sheet. The polyaryletherketone foamed sheet comprises a middle foamed layer, an upper foamed layer and a lower foamed layer, the middle foaming layer and the upper and lower foaming layers have different densities; the middle foaming layer and the upper and lower foaming layers have different foaming ratios; and the middle foaming layer and the upper and lower foaming layers have different foam hole diameters. The invention designs a sandwich polyaryletherketone foam board with a specific structure. The sandwich polyaryletherketone foam board is divided into a middle foam layer, an upper foam layer and a lower foam layer. The sandwich structure with different density distributions is utilized, so that under the same density, the sandwich structure material foam has high rigidity, bending strength and other comprehensive mechanical properties and comprehensive mechanical properties. In addition, the polyaryletherketone foamed board provided by the invention c