Method to prevent chemical (HCFC) attack of plastic foodliner from foam insulation chemicals
AssigneeWhirlpool Corporation
InventorsArthur E. Benford, Kenneth L. Hortin
Life of this patent
Estimating the term…
Abstract
An insulated cabinet wall structure for a refrigeration apparatus includes an outer wall defining an inner surface and a plastic liner defining an outer surface. A laminated film is adhered to the liner sheet outer surface, the film comprising in laminated sequence an inner adhesive film layer for adhering to the liner sheet outer surface, a film of high elongation material, an additional adhesive film layer, and an outer barrier film layer. A foamed-in-place insulation is firmly bonded to the outer wall inner surface and the laminated film barrier film layer, the barrier film layer both preventing stress cracking of the liner and diffusion of insulation foam blowing agents from the insulation to the liner sheet.
Claims18
A method of fabricating a liner for a refrigeration apparatus insulated cabinet wherein the insulation is foamed-in-place, comprising the steps of:
- providing a liner sheet having an inner surface and an outer surface;
- adhering a laminated film to said liner sheet outer surface, said film comprising in laminated sequence an inner adhesive film layer for adhering to said liner sheet outer surface, a film of high elongation material, an additional adhesive film layer, and an outer barrier film layer to prevent diffusion of insulation foam blowing agents and for adhering to insulation foamed-in-place thereagainst;
- and
- forming said liner sheet with said laminated film thereon into a liner configuration with said barrier film layer disposed outwardly to provide a stronger bond between the barrier film layer and insulation subsequently foamed-in-place thereagainst than between said liner outer surface and said inner adhesive film layer to both prevent stress cracking of the liner and diffusion of insulation foam blowing agents from insulation to said liner sheet.
An insulated cabinet wall structure for a refrigeration apparatus, comprising:
- an outer wall defining an inner surface;
- a plastic liner defining an outer surface;
- a laminated film adhered to said liner sheet outer surface, said film comprising in laminated sequence an inner adhesive film layer for adhering to said liner sheet outer surface, a film of high elongation material, an additional adhesive film layer, and an outer barrier film layer;
- and
- foamed-in-place insulation firmly bonded to said outer wall inner surface and said laminated film barrier film layer, said barrier film layer both preventing stress cracking of the liner and diffusion of insulation foam blowing agents from said insulation to said liner sheet.
An insulated cabinet wall structure for a refrigeration apparatus, comprising:
- an outer metal wall defining an inner surface;
- a plastic liner defining an outer surface;
- a laminated film adhered to said liner sheet outer surface, said film comprising in laminated sequence an inner adhesive, releasable film layer for adhering to said liner sheet outer surface, a film of high elongation material to provide stress relief, an additional adhesive film layer, and an outer barrier film layer, said additional adhesive film layer adhering said film of high elongation material to said barrier film layer;
- and
- foamed-in-place insulation firmly bonded to said outer wall inner surface and said laminated film barrier film layer, said barrier film layer both preventing stress cracking of the liner and diffusion of insulation foam blowing agents from said insulation to said liner sheet.
Dependencies are inferred from the claim text.