Method for forming a vacuum insulated structure

1. A method of forming a vacuum insulated structure, the method comprising steps of:

providing a plurality of outer walls attached together to define a structural envelope, the structural envelope having an insulation port and a vacuum port in communication with an insulating cavity defined within the structural envelope;

attaching an expanding device to two opposing outer walls of the structural envelope;

expanding the insulating cavity of the structural envelope by pulling the two opposing outer walls of the structural envelope away from one another to define an expanded state of the structural envelope, the expanded state defining an expanded interior volume;

disposing an insulating material within the insulating cavity via the insulation port, wherein the insulating material occupies substantially all of the insulating cavity in the expanded state;

closing and sealing the insulation port;

expressing gas from the insulating cavity via the vacuum port to at least partially collapse the structural envelope to a final state of the structural envelope, the final state of the structural envelope defining a final interior volume, the final interior volume being less than the expanded interior volume, and wherein the final state of the structural envelope defines a densified state of the insulating material within the insulating cavity; and

closing the vacuum port to seal the insulating cavity.

2. The method of claim 1 , wherein the structural envelope is metallic.

3. The method of claim 2 , wherein the expanding device attaches to the two opposing outer walls via a magnetic attachment mechanism.

4. The method of claim 1 , wherein the structural envelope defines a planar structural panel.

5. The method of claim 1 , wherein the structural envelope defines a structural cabinet of an appliance, the structural cabinet including a plurality of structural walls.

6. A method of forming a vacuum insulated panel, the method comprising steps of:

forming a structural envelope having opposing outer walls and a perimetrical edge extending between the opposing outer walls, the opposing outer walls and the perimetrical edge cooperating to define an interior insulating cavity;

placing the structural envelope into a retaining structure that engages the structural envelope proximate the perimetrical edge;

attaching an expanding device to the opposing outer walls of the structural envelope;

expanding the interior insulating cavity of the structural envelope by pulling the opposing outer walls of the structural envelope away from one another to define an expanded interior volume of the interior insulating cavity;

disposing an insulating material within the interior insulating cavity, wherein the insulating material occupies substantially all of the expanded interior volume of the interior insulating cavity;

expressing gas from the interior insulating cavity via a gas port of the structural envelope, wherein expression of gas at least partially draws the opposing outer walls toward one another to define a final state of the structural envelope, the final state defined by a contracted interior insulating volume that is less than the expanded interior volume, the final state also corresponding to a densified state of the insulating material within the interior insulating cavity; and

closing the gas port to hermetically seal the interior insulating cavity.

7. The method of claim 6 , wherein the retaining structure is a frame that extends continuously around the perimetrical edge of the structural envelope.