Patent ID: 8728362

Claim:
A process for producing plastics profiles with a foamed core in a coextrusion process, the process comprising: coextruding a foamable material in a solid state into a cavity of a hollow plastics profile; and foaming the foamable material in the cavity of the hollow plastics profile, wherein the coextruding and foaming further comprise: i) charging a plastic in a solid state to a first heatable extruder; ii) melting and compressing the plastic during conveying by means of a conveying screw in a direction of a die; iii) extruding the molten plastic through the die to give a hollow plastics profile; iv) charging the solid, foamable material to a second extruder; v) conveying the foamable material in the solid state by means of a conveying screw in the direction of the die; vi) conveying the foamable material in the solid state into the cavity of the coextruded hollow plastics profile; and vii) foaming the foamable material to completion within the cavity of the hollow plastics profile, wherein the hollow plastics profile is cooled externally by a cooling device shortly prior to the conveying of the foamable material into the cavity of the coextruded hollow plastics profile in such a way that an outside of the hollow plastics profile has completely solidified but internally retains a temperature sufficient for the foaming of the foamable material.