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Patent 'Office Patented Mar. 16, 1926. _ 1,576,663 ‘UNITED STATES PATENT ‘OFFICE. GUY LEONARD, OI‘ BALTIMORE, MARYLAND. I I STENCIL SHEET. 80 Drawing. Application ma my 11, 1925. Serial a... cam. To all whom it may concern: rates from the coated sheet, the weight of Be it known that I, GUY LEONARD, a sub the shellac in the dried coating may ?nally be somewhat less than the weight of the ject of the King of Great Britain residing 60 ' in Baltimore, in the county of l3altimore triacetin. ' Triacetin and shellac being mu and State of Maryland, have invented cer-. tually soluble in alcohol, or in- ether, or tain new and useful Improvements in Sten acetone, or any of the common solvents for cil Sheets, ‘of which the following is a speci shellac, the result is therefore a homogeneous ?cation. coating, u n evaportion of the solvents at This invention relates to stencil-sheets for the sheet- rying operation. 10 typewriting and stylographic'work. An added softening or tempering ingredi The principal object of the invention is cut is diethylphthalate, of which ?ve parts to produce at low cost an efficient, strong, by weight may be used. 'The- diethylphtha durable and economical stencil-sheet, which late is also soluble in ‘alcohol or .the other 7'0 . does not crack and will withstand crum common solvents, thus making with ‘the 15 pling and rough handling, and which is las shellac and triacetin a homogeneous, dry coating upon the evaporation of the alcohol tic and pliable and can be stenciled wit ‘out , " or solvent. dampening, but which will yield far more While the speci?ed proportions of the copies than an ordinary wax stencil-sheet. 75 and which will cause the ink to be deposited various ingredlents give excellent results, 20 sparingly on the stencil-copies, thus improv still- the proportions may be varied within ing the‘ product and economizing ink and the scope of the invention. There is also also avoiding the necessity of blotting the rmissible some latitude of variation in the ingredients themselves, as, for example, stencil-copies or of using anti-offset devices, 80 and which will preserve its good qualities , glycerin may be used as a substitute soften both before and after empressing the sten ing agent, or a suitable oil, or‘, a suitable cil-characters thereon. grease. Or the softenin agent dieth l . The raw- sheet or base of the stencil-sheet phthalate may be modi?ed y ~glycerin, or y is loose-?bred paper, such as Yoshino, which a suitable oil or grease.' If deslred, a good is coated by using a liquid that includes a substitutev softening agent can be made of large proportion, say twenty parts by palm oil and stearic acid (or oleic acid) in weight, of a 25 per cent shellac solution in the proportionsv of about 3 parts palm oil methyl‘ alcohol, although the strength of and about 2 parts stearic acid. When oil or this solution’ may be varied. The shellac stearic acid or oleic acid is. employed in should be a good quality orange shellac. softening,'su?icient heat should be applied 35 However, shellac solutions of diiferent to secure a proper-solution. qualities. and grades may be employed; The coating preparation. can be colored and‘ ‘the proportion of shellac solu with any dye that is soluble in alcohol. or tion used in the herein-disclosed formula in a common solvent of the solution. maybe varied to suit. The strength of the‘ The coating solution may be preparedv at 40 shellac solution itself may also. be varied.‘ ordinary room temperature, preferably by ~ It will be understood that for dissolvingthe ?rst mixing the liquid triacetin and di shellac, any suitable ‘ alcohol, acetone or ethylphthalate,~and then adding the shellac . amylacetate may be used. This solution is solution, in any suitable vessel, and then if desired adding a dye. This bath‘ may be 100. temporary, inasmuch as the alcohol‘ eventu kept at room temperature, and in it the 45, ally dries out of the coating'upon the sten vYoshino paper-sheets may be immersed; or- . oil-sheet‘.v _- - A With the shellac solution is used a propor the sheets may begust ?oated upon this coat ing bath _or_ hqui . The excess of thecoat tion of about eight parts by weight of a. ing liquid may be'removed from the sheet glycerol‘ fatty acid 7 ester, ,which may be by drawing it over a straight edge or wire 6o. triacetin, by the aid of which it is designed or other suitable device, and the sheetmay to secure great and permanent pliability and be hung up to dry. There is su?icient elasticity in the stencil-sheet. The triacetin eva oration of the alcohol in from twenty is a lasti?er, or renders the coating more to t irty minutes, to permit handling of the no plast1c, or gives‘ it a' gummy quality. The sheet.» When dry, the sheet is- ready forv 55 shellac and triacetin‘ form a mixture or me-' chanical compound. Since alcohol-evapo use lathe typewriting machine. 'Fortranss. 1,570,008 ' portation, storage and handling, sheets “- of oil paper may be packed between the stencil‘ pli'ko?'setting. There is a decided saving of sheets, whose tackiness, if present, is hardly > The invention isfnot limited to the pro~ appreciable. The oil sheet is preferably re portions given; andwithin the scope of the moved before inserting the stencil-sheet in mvention various substitutes or equivalents the typewriter. Tackiness may be reduced ,may be used ‘for the binding gum, the ester J or eliminated by diminishing the proportion ‘and the softener, as will be understood by ‘. of shellac. The shellac, as well as being im those skilled’in chemistry. pervious to stenciling ink, binds or holds the ' I claim: ' in other ingredients together. Other binding 1. A stencil-sheet of loose-?bered paper agents than shellac may be used, and ,con— coated with a solution of shellac, triacetin duce to toughness, durability and ink-resist and diethylphthalate. -_ ' ‘ ing qualities of the stencil-sheet». The . 2.- A stencil-sheet having a base of loosej trlacetin prevents the shellac from becoming ?bered paper provided with a dried 55 15 brittle. The diethylphthalate softens or homogeneous coating having by weight tempers the coating. - about ?ve parts of shellac, eight parts of The typewriter-types make cleaner and triacetin, and ?ve parts of diethylphthalate. narrower cuts in the‘ stencil than usual here 3. A paper-coating bath including twenty tofore, indicating the quality of elasticity parts by weight of twenty-?ve per cent 00 imparted by the triacetin. The stencil shellac solution in methyl alcohol, eight sheet is highly economical of ink durin the parts by weight of triacetin, and ?ve parts operation of producing stencil-copies t ere-' by weight of diethylphthalate. from. There is no need to blot the stencil 4. A loose-?bered paper provided with a copies or to interleave sheets therewith, or homogeneous coating of a glycerol vfatty to use other anti~oifset devices. The stencil acid ester, diethylphthalate, and a binding copies can be handled at once, without agent. _ danger of smearing the ink thereon. The '5. The process of dissolving shellac in . stencil-sheet preserves its original form not‘ alcohol, mixing in the solution glycerol fatty withstanding wrinkling, crumpling and acid ester, and adding to the solution di 70 rough handling; it is-elastic, and does not permanently stretch, nor do the ?bres of ethylp‘hthalate.6.- he process of dissolving shellac in the Yoshino tissue base loosen or pullapart. alcohol, mixing in the solution glycerol fatty It is excellent for stylographic work as well acid ester, and addin to the solution di as typcwriting. ' . ' ethylphthalate and a dye. ‘ - 76 In making copies from the typed or other ‘ 7. An ink-proof coating bath for paper, wise impressed stencil, very much less ink having twenty parts by' weight of a than heretofore reaches the stencil-copy, and twenty-?ve per cent solution of orange hence the inked characters do not spread shellac in methyl alcohol, about ei ht parts thereon and become unsightly, nor is blot by weight of triacetin, and about ?ve parts 80 tin necessary, but the copies can be handled by weight of diethylphthalate. ' rig t away, or piled up, without smearing GUY LEONARD.‘ .
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