Polypropylene composition for HMS PP foam sheet with balanced bending resistance

A process comprising the following step

• a) producing a polypropylene composition comprising
• 20.0 to 30.0 wt. % of recycled polypropylene (R-PP);
• 69.0 to 79.9 wt. % of a high melt strength polypropylene (HMS-PP) having an F30 melt strength of 25.0 cN to 40.0 cN and a v30 melt extensibility of 225 to 260 mm/s, wherein the F30 melt strength and the v30 melt extensibility are determined according to ISO 16790:2005;
• and
• 0.05 to 6.0 wt. % of a nucleating agent (NA),
• wherein the recycled polypropylene (R-PP) has an F30 melt strength of 1.0 to 20.0 cN, determined according to ISO 16790:2005, and a melt flow rate MFR2 (230° C.) measured according to ISO 1133 in a range of 5 to 15 g/10 min;
• and
• wherein the nucleating agent (NA) is talc;
• whereby the recycled polypropylene (R-PP), the high melt strength polypropylene (HMS-PP) and the nucleating agent (NA) are simultaneously or consecutively combined and mixed in a mixing device.