![]() ![]() a carbon sheet of the second class is obtained which is substantially non-stenci'lling, due to the fact-that the coloring matter penetrates the paper or other carrier, and which also is non-curling because the coloring coating is so intimately combined with the paper or other carrier sheet that the latter has substantially a uniform co-eflicient of expansion throughout.Such acarbon sheet has two disadvantages first, the sheet is substantially a'stencil and upon each use thereof a great, deal of the coating comes ofi, so that the life of the carbon sheet is comparativel limited and second, the coating has a di erent coeflicient of expansion from that of the carthe stored goods.a coat ing containing a wax with an insoluble color, suchf for instance, as lamp black.Owigrg to the short period of time that-the col coating is'heated, the color coating does not have sufiicient time to penetrate the carrier, so that the carbon sheet produced has the color coating adhering substantially only to. condition, and after properly being spread over the carrier, is immediately subjected to a cooling action for the reason that if the wax in the coating is maintained too long a period of time, the most (1 sirable carbon paper is not obtained. This is ap liedto one 'face of the carrier while in a of. the second class of carbon sheets In manufacturing the second class of carbon sheets,'it is customary to employ a coat ing containing a wax with an insoluble color, suchf for instance, as lamp black.the other class of carbon sheets employsa high grade of paper stock mostgenerally linen tissue as a carrier, and a color-coating high in wax-content and low insoluble color content.Those-carbon sheets of the first class employ a highsaturable carrier or paper with in a heated condition for an extremely penetrating color or coating, due to the use of little or no insoluble coloring matters in the coating and to the use ofbut a small amount of wax. ![]() for pencil carbons and those which produce a substantially permanent record and are employed most generally for making copies on typewriting machines. classes namely, those which produce a substantially non-permanent record and are employed.B41M5/10- Duplicating or marking methods Sheet materials for use therein by using carbon paper or the like.B41M5/00- Duplicating or marking methods Sheet materials for use therein.B41M- PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES COLOUR PRINTING. ![]()
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