Polyurethane-based insulation body and method for producing same

A process for producing an insulation body based on a fine- and open-celled polyurethane/polyisocyanurate foam in a cavity of a mold, comprising:

• a. optionally inserting an optionally pre-molded insert into the cavity of the mold,
• b. inserting a barrier film into the cavity or, if present, onto or into the insert,
• c. applying a pressure of 8-30 bar in the cavity,
• d. injecting a polyurethane reactive mixture containing supercritical CO2 into the pressurized cavity,
• e. decompressing to ambient pressure after a time of 1 to 40 seconds measured after the injection,
• f. curing the polyurethane reactive mixture,
• g. applying a vacuum of 0.001 mbar to 0.5 mbar in the cavity,
• h. sealing any holes in the barrier film, and
• i. demolding the resulting insulation body.