Mechanical stickiness device

The adhesiveness of masa can be rapidly evaluated with a mechanical stickiness device consisting of two rectangular bars in a parallel arrangement. A block of masa is formed between the bars and partially split with a cutter, and the adhesiveness is measured by raising the movable bar until the masa detaches from it. The degree of adhesion of masa to the upper bar gives an adhesiveness index (Ramirez-Wong et al. 1993). 

Keypads that are ever-present in cell phones, pagers and automotive or consumer appliances generally feature a delicate but reliable switch behind the buttons, implemented with a metal dome placed on the PCB or flex-foil. The domes are secured mechanically to the PCB or flex-foil with a sticky foil, so they will not shift during use. Per module, all domes are placed on one sticky foil, then the backing paper is peeled away and the assembly is applied upside-down onto the device. 

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