ellemme ha scritto:


Oh Gesu, veramente internet sta rincitrullendo gli studenti.
Saranno così anche i miei... ? Biblioteca.... ????? Orami divenuto luogo sconosciuto ??????

Diasec
The idea of face-mounting photographs likely originated from Switzerland, in the early 1970s, when Heinz Sovilla-Brulhart patented a mounting technique for photographs.His original concept consisted of placing the prints between two sheets of glass or PMMA, then removing the air in the sandwich and sealing the edges (Swiss patent nº 489 040). The process, however, presented some problems due to the formation of Newton rings on the surface of the print. In a new patent (Swiss patent nº 483 658), Sovilla offered a solution by spraying a thin varnish over the print, prior to its insertion between the plates. While the minute droplets of varnish impeded the formation of the unwanted Newton rings, the prohibitive cost of the two sheets of PMMA used in the mounting process lead Sovilla to the idea of face-mounting the prints using an acrylic pressure sensitive adhesive (Swiss patent nº 534 901). Finally, after learning about experiments on Plexiglas at the Rà¶hm plant in Germany, he decided to adopt a moisture curing silicone rubber system as his adhesive.The new process was patented in 1972 (Swiss patent nº 527 263), and the company Diasec Sovilla SA was formed. The Diasec process is proprietary and license contracts with strict regulations have been sold to a small number of mounting studios throughout the world. A total of ten licensed mounting studios are found in Austria, Belgium, England, France, Germany, Holland, Israel, Italy, and Switzerland. In December 1992, Heinz Sovilla-Brulhart died, and his widow and son took over sales of the license, production, and distribution of the special primer, the solution that enhances adhesion between the silicone rubber, the acrylic sheet, and the emulsion.

The ingredients of the primer are the main secret of the Diasec process, and Mrs. Sovilla referred to the recipe as her “Coca-Cola formula.”The silicone rubber is not provided, but the licensees are encouraged to purchase the “ideal”product produced by an undisclosed German company.

With the increased popularity of facemounting, a number of unlicensed photographic printing and mounting studios have begun to offer virtually the same process with silicone rubber systems from different manufacturers.