Fibrous blanket containing solder flux and solder flux with increased melted viscosity (US Patent 3,936,325, 1976)

Dunbar L. Shanklin received US Patent No. 3,936,325 on February 3, 1976, filed September 23, 1974.

The patent's abstract:

This invention relates to the use of a zinc-ammonium chloride solder flux of the type intended to be used on high temperature solder baths of an inert or partially inert three dimensional fibrous blanket to impede the circulation of the thin melted zinc-ammonium chloride flux on the surface of the high temperature solder bath and thus extend the life of the solder flux by reducing the volatilization of the ammonium chloride active fluxing agent. This invention also relates to the use in a zinc-ammonium chloride solder flux of the type intended to be used on high temperature solder baths of a viscosity thickening ingredient which increases the viscosity of the melted flux sufficiently to stop the normal circulatory stirring motion of the thin liquid melted zinc-ammonium chloride flux but permits a limited turn-over motion at the interface of the rotating solder roll and the bath of melted flux, with the balance of the melted flux remaining essentially stationary. This circulation inhibiting action results in the top surface of a large portion of the melted flux bath becoming cooler than the high temperature of the solder and thus extends the life of the solder flux by reducing the volatilization of the ammonium chloride active fluxing agent.

Where it was listed

• Asbestos, May 1976, in its patents department (the year's issues)