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The hectograph, gelatin duplicator or jellygraph is a printing process that involves transfer of an original, prepared with special inks, to a pan of gelatin or a gelatin pad pulled tight on a metal frame. [1] While the original use of the technology has diminished, it has recently been revived for use in the art world.
Materials prepared for dry powder forming are most commonly formed by "dry" pressing in mechanical or hydraulic powder compacting presses selected for the necessary force and powder fill depth. Dry powder is automatically discharged into the non-flexible steel or tungsten carbide insert in the die and punches then compact the powder to the ...
Grog, temper for clay. Grog, also known as firesand and chamotte, is a raw material usually made from crushed and ground potsherds, reintroduced into crude clay to temper it before making ceramic ware. It has a high percentage of silica and alumina. It is normally available as a powder or chippings, and is an important ingredient in Coade stone.
An effect of World War I was a scarcity in raw materials such as photographic paper, optical glass, gelatin and many chemicals, including methanol, acetic acid and acetone. After the war ended, George Eastman, founder of Eastman Kodak, began working to develop an independent supply of chemicals for his photographic processes.
The history of today's Gelita AG in Eberbach dates back to 1875, when the production of gelatin was started in Schweinfurt. Gelita was preceded by the founding of the "Gebrüder Köpff Company", [8] Heinrich Koepff's small tannery, in 1883. Shaken by the economic crisis of the time, Heinrich saw a way out of his misery in gelatin production.
To allow efficient stacking of product in the furnace during sintering and to prevent parts sticking together, many manufacturers separate ware using ceramic powder separator sheets. These sheets are available in various materials such as alumina, zirconia and magnesia. They are additionally categorized by fine, medium and coarse particle sizes.
Powder abrasives, used in a variety of finishing operations, are made using a sol–gel type process. One of the more important applications of sol–gel processing is to carry out zeolite synthesis. Other elements (metals, metal oxides) can be easily incorporated into the final product and the silicate sol formed by this method is very stable.
Gelatin, along with its more familiar uses, is widely used for the production of microparticles due to its efficiency in forming gels as well as its biodegradability as a particle. Gelatin can be manipulated to form a stable matrix for biologically reactive compounds, allowing for the incorporation and protection against enzymatic degradation. [1]