Measuring and testing – Coating material: ink adhesive and/or plastic
Patent
1997-06-09
1998-06-23
Raevis, Robert
Measuring and testing
Coating material: ink adhesive and/or plastic
G01N 1908
Patent
active
057689369
ABSTRACT:
A method and apparatus are provided for testing the adhesive strength of a bond between an adhesive, a coating such as paint, or some other material, and an underlying substrate to which the test substance is bonded. The coating to be tested is applied atop the substrate in a smooth, continuous layer. An aperture is formed through the substrate and the test substance. A thin film patch is positioned atop an area of the test substance directly above the aperture. The film extends beyond the perimeter of the aperture and resides in contact with the test substance. The test substance is scored about the perimeter of the thin film patch. A thin plate which maintains its elastic property with only minor yielding during the test is bonded to the test substance by means of a layer of high-strength adhesive interposed between the plate and the test substance. The adhesive strength of the bond between the plate and the substance being tested must be greater than the bond between the substance being tested and the substrate. The test assembly thereby produced is clamped within a test fixture and pressure is applied through an aperture in the test fixture from the side of the substrate opposite the surface of the substrate to which the test substance is bonded. With increasing pressure the plate is deformed at the aperture through the substrate thereby applying force to the area of the test substance surrounding the thin film patch until the critical pressure is reached and the bond between the test substance and the substrate fails.
REFERENCES:
patent: 4393699 (1983-07-01), Seiler, Jr.
patent: 4501154 (1985-02-01), Mori
patent: 4567758 (1986-02-01), Fisher et al.
Raevis Robert
Thomas Charles H.
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