Method of Performing Adhesion Peel Tests on Unsupported Decal Film
Original Publication Date: 1987-Dec-01
Included in the Prior Art Database: 2005-Feb-02
A peel test is used to measure the adhesion of a metalized surface to decal film. The peel test is performed by pulling a metalized circuit line vertically while holding the decal in a horizontal position. Because the decal film is thin, the pulling of the circuit line flexes the film, which gives a false reading of peel data. To eliminate the false reading, a metal slug is epoxied to the back side of the decal to reinforce the film, thereby preventing its flexing. While the addition of the slug prevents flexing, it creates other problems, i.e., effort to attach slug, remove it, etc. A method of accurately measuring peel strength, without utilizing a slug, is described in the following method. In Fig. 1 a decal film 1 with a supporting frame 2, has the active area 3 cut away from the frame.