US5118174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method to prevent chemical (HCFC) attack of plastic foodliner from foam insulation chemicals
Assignee: Whirlpool Corp
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Filing: 1991-05-17
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Granted: 1992-06-02
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Expires: 2011-05-17
Abstract
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.
Inventors
- 👤 Arthur E. Benford
- 👤 Kenneth L. Hortin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:28
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/18; B32B5/20; B32B15/00; B32B15/04; B32B15/08; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/32; B32B7/00; B32B7/04; B32B7/12; F; F25; F25D; F25D23/00; F25D23/06; F25D23/065; F25D23/066; B32B2311/00; B32B2323/00; B32B2323/04; B32B2323/046; B32B2509/00; B32B2509/10
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
163 words
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.
Claim 2
Independent Claim
163 words
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.
Claim 3
Dependent Claim
24 words
The method of fabricating a liner of claim 1 wherein said adhesive film layers comprise film formed of copolymers of ethylene and vinyl acetate.
Claim 4
Dependent Claim
48 words
The method of fabricating a liner of claim 2 wherein said adhesive film layers are formed of different compositions to provide a stronger bond between said film of high elongation material and said outer barrier film than between said liner sheet and said film of high elongation material.
Claim 5
Dependent Claim
24 words
The method of fabricating a liner of claim 1 wherein said film of high elongation material comprises a film of linear low density polyethylene.
Claim 6
Dependent Claim
28 words
The method of fabricating a liner of claim 1 wherein said liner sheet is formed of synthetic resin material and said liner sheet and laminated film are coextruded.
Claim 7
Dependent Claim
39 words
The method of fabricating a liner of claim 1 wherein said liner sheet is extruded at a preselected elevated temperature and said laminated film is laminated to the liner sheet while the liner sheet is at an elevated temperature.
Claim 8
Dependent Claim
113 words
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.
Claim 9
Dependent Claim
113 words
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.
Claim 10
Dependent Claim
23 words
The insulated cabinet wall structure of claim 7 wherein said adhesive film layers comprise film formed of copolymers of ethylene and vinyl acetate.
Claim 11
Dependent Claim
47 words
The insulated cabinet wall structure of claim 8 wherein said adhesive film layers are formed of different compositions to provide a stronger bond between said film of high elongation material and said outer barrier film than between said liner sheet and said film of high elongation material.
Claim 12
Dependent Claim
23 words
The insulated cabinet wall structure of claim 7 wherein said film of high elongation material comprises a film of linear low density polyethylene.
Claim 13
Dependent Claim
18 words
The insulated cabinet wall structure of claim 7 wherein said liner sheet is formed of synthetic resin material.
Claim 14
Dependent Claim
16 words
The insulated cabinet wall structure of claim 7 wherein said outer wall is formed of metal.
Claim 15
Dependent Claim
136 words
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.
Claim 16
Dependent Claim
136 words
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.
Claim 17
Dependent Claim
23 words
The insulated cabinet wall structure of claim 13 wherein said adhesive film layers comprise film formed of copolymers of ethylene and vinyl acetate.
Claim 18
Dependent Claim
47 words
The insulated cabinet wall structure of claim 14 wherein said adhesive film layers are formed of different compositions to provide a stronger bond between said film of high elongation material and said outer barrier film than between said liner sheet and said film of high elongation material.
Claim 19
Dependent Claim
23 words
The insulated cabinet wall structure of claim 13 wherein said film of high elongation material comprises a film of linear low density polyethylene.
Claim 20
Dependent Claim
18 words
The insulated cabinet wall structure of claim 13 wherein said liner sheet is formed of synthetic resin material.
Claim 21
Dependent Claim
16 words
The insulated cabinet wall structure of claim 13 wherein said outer wall is formed of metal.
References Cited (Backward Citations)
US4190305A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-02 | 1995-12-02 | 1996-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-02 | 1999-12-02 | 2000-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-02 | 2003-12-02 | 2004-06-02 | $7700.00 | Window Closed / Lapsed |