refrigerator

The patent applies curvature by forming beads (protruding curved structures) at the thickness transition portions of the insulation layer. These beads have a rounded, spherical geometry that redistributes stress concentrations that would otherwise occur at sharp corners or abrupt thickness changes. The curved surface of the beads allows stress to distribute more evenly throughout the insulation material, preventing deformation and cracking while maintaining the required insulation thickness for thermal performance.

The beads are formed in advance at the thickness transition portions before the insulation material undergoes shrinkage or expansion during operation. These pre-formed protruding structures act as cushioning elements that absorb and distribute the stresses generated by thermal cycling and material shrinkage/expansion. By providing this protective structure beforehand, the patent prevents deformation and cracking that would otherwise occur at vulnerable thickness transition zones.

The beads are pre-formed at the thickness transition portions to provide cushioning protection before thermal cycling begins. During shrinkage and expansion cycles, these beads absorb and distribute the generated stresses, preventing deformation and cracking. The beads enable the insulation material to adapt freely to thermal conditions while maintaining structural integrity at vulnerable transition zones.

The curved geometry of the beads provides a smooth transition for stress distribution during thermal cycling. As the insulation material shrinks or expands, the rounded bead surfaces allow stress to distribute evenly rather than concentrating at sharp corners or abrupt thickness changes. This curvature maintains structural integrity while allowing the material to adapt to varying thermal conditions.