Method for thermally insulating an evacuable container

A method for thermally insulating an evacuable container comprising an inner container, an outer container and a cavity disposed between the inner container and the outer container, wherein the cavity is provided to receive a thermally insulating particulate material;

• and wherein the method for providing the cavity with the thermally insulating particulate material comprises the steps of:
• evacuating the cavity;
• filling the cavity with the thermally insulating particulate material;
• compressing the thermally insulating particulate material in the cavity;
• evacuating the cavity;
• and sealing the cavity;
• wherein:
• a) a vacuum pump is used to reduce pressure in the cavity and after achieving a first value of the pressure, connection between the cavity and the vacuum pump is interrupted;
• b) subsequently making a connection from a reservoir container of the thermally insulating particulate material to a filling opening provided in the region of the cavity;
• c) setting the evacuable container into motion, wherein the thermally insulating particulate material flows into the cavity according to a) and the pressure in the cavity increases due to air introduced with the thermally insulating particulate material;
• d) terminating the filling at a second value of the pressure by interrupting the connection from the cavity to the reservoir container;
• e) repeating step a), wherein the output of the vacuum pump with which the cavity is deaerated is controlled such that the profile over time of the mass flow exiting from the cavity of air introduced with the thermally insulating particulate material is at a maximum;
• f) subsequently repeating steps b)-e) until desired degree of filling is reached;
• and
• g) as the final step sealing the evacuated cavity.