Abstract: A printing apparatus which comprises a carriage that is movable along a record carrier, an ink printing head for applying ink to the record carrier, and a stationary reservoir mounted adjacent the carriage for storing ink to be applied to the carrier. An intermediate container which, together with the ink printing head, is attachable to the carrier is flow-connected to the ink printing head for supplying ink obtained from the reservoir. The intermediate container includes a hollow housing having upper and lower portions defining an ink storage chamber and a bladder containing air which is suspended within the ink storage chamber, the interior of the bladder being connected to the atmosphere through an opening in the housing.

Abstract: A method for the production of an ink suitable for use in ink-jet printing, free from foreign salts, made from technical dyes. A highly water-soluble dye is dissolved in water and precipitated with a precipitant amine. The precipitate is separated from the solution and distilled with water and a water-soluble amine of low volatility to convert the dye back to a soluble form.

Abstract: An aqueous black ink for a writing process in which ink is transferred in droplets onto a print carrier. The ink comprises 25-42 g./l. of the direct Diamine Blue 6B, extra high concentration; 14-22 g./l. of the direct dye Diamine Scarlet 4BS, extra concentration; 290-430 ml./l. of formamide; 32-48 ml./l. of 90% diethanolamine, 24-60 g./l. of citric acid, a water-soluble and organic soluble disinfectant, and balance essentially water. A process for producing such an ink comprises the steps of mixing both dyes together; introducing the mixture at room temperature in incremental portions into the formamide and stirring until the dyes are substantially completely dissolved. Undissolved salts are removed from the mixture. Diethanolamine and distilled water are introduced under agitation into the mixture. The pH is adjusted to about 6 to 8 with citric acid and disinfectant is added. The mixture is filtered under vacuum and then gases are withdrawn by treating the mixture under a vacuum.

Abstract: An aqueous ink for an ink ejection process, particularly a blue ink for a process employing an ejection system which produces droplets, comprises (a) a water soluble triphenyl methane dye and (b) a buffer mixture of at least one organic hydroxy-containing carboxylic acid and at least one water soluble amine.