US1461867A - Art of stencil making - Google Patents

Description

- parte Patented July 17, I923.

E ii STATES p I ,461,8t7 PATENT OFFICE.

STERLING ELLIOTT, OF CAMBRIDGE, MASSACHUSETTS; HARRIET ADELL ELLIOTT EX- ECUTBIX 0F SAID STERLING ELLIOTT, DECEASED.

'nnr or STENCIL MAKING.

Ito Drawing.

To all whom it may concern:

Be it known that I, STERLING ELLIOTT, a citizen of the United States, residing at Cambridge, in the county of Middlesex and State of Massachusetts, have invented an Improvement in the Art of Stencil Making, of which the following is a specification.

This invention relates to the art of stencil making and has particular reference to a method of treating the paper in which the stencil-characters are impressed, by which it becomes strong and toughpand in condition properly to receive the impressions and the ink.

I find that the best results are obtained with the use of a particular type of Japanese paper known as Yoshino characterized by very long fibres and considerable strength for its lightweight. The finished stencil has a coating of tempered gelatine on one side only which is adapted to be cut through and displaced in the process of making the stencil, but the fibres of the paper should remain intact. sage of ink for printing only where the gelatine is cut through and the stencil may thereby print the characters previously formed in the stencil.

My'method comprises initially coating one side of the paper sheet from which the individual stenclls are to be cut, with a layer of g'elatine and glycerine, and subsequently treating the coated sheet to temper the coating b which added strength may be imto the prepared stencil paper.

In the performance of my method I first apply the gelatine coating as a solution of gelatine, glycerine and water and by any suitable means, to one side only of the sheet; and the coating solution is allowed to remain in contact with the sheetuntil it penetrates the paper. Care, of\ course, must be taken that the paper sheet is uniformlycoated and that the solution uniformly permeates the paper from the coated side. f

I find that very satisfactory results are obtained by employing a gelatine coating solution for the one side comprising the following ingredients and in about the following roportions: v

Gelatine, 8 ounds; glycerine, 11- pounds; water, 7% gal ons.

The amount of each ingredient of the coating solution is not fixe however, and for best results, it is preferable to vary the The stencil allows the pas-- Application filed March 1, 1920. Serial No. 362,570.

relative amounts of the ingredients, especially in accordance with variation of weather conditions.

After the paper sheet has been coated on one side with the gelatine solution it is hung up and allowed to drain and dry. The

drying period usually takes place over night, or extends for about 10 or 12 hours, and the paper is then in condition for further treatment.

The next step in the process consists in applying a gelatine-tempering and paperstrengthening solution (preferably also containing glycerine) to both sides of the partially drled sheet, preferably by dipping or immersing the entire sheet in the solution.

The efiect of this step is to so toughen the gelatineas. to render it practically unaffected by ordinary use. The glycerme content of the solution aids materially in retaining the strength and flexibility of the sheet.

The toughening solution comprises, preferably, alum, 3 pounds; glycerine, 3 gallons;

water, 12 gallons.

The relative amounts may be varied somewhat, to obtain uniform results.

The condition of the finished sheet is indicated to the practical observer by noting the character of and resistance to tear of the treated sheet.

After the finished sheets have been hung up for draining and drying they are in condition to be cut and manufactured into stencils.

The paper, so treated, is exceptionally strong, as contrasted with its strength before treatment, and is very flexible andwill remain in this condition for a long period.

But one side of the paper sheet 15 coated and the-other or non-gelatine with gelatine, coated side is adapted to contact with the material to be stencilled.

I claim:

1. The method of preparing stencil sheets which consists in initially treating the sheet on one side only with a solution containing gelatine and water, and subsequently coating both sides of the sheet with a solution consisting of alum, glycerine and water.

2. The method of preparing stencil sheets which consists in treating the sheet-on one side only with a solution consisting of gelatine, glycerine and water, allowing the water to evaporate and subsequently immersing I the sheet in a solution containing. glycerine, 'alum'and water.-' j 3. The method of preparing stencil'sheets which consists in treating the sheet on one.

5 side only with a gelatineand glycerine solution until the paper is ermeated from the treated side, allowing t e waterof the solution to evaporate, and subsequently treating the sheet on both sides wit a so- 10 lution containing alum, glycerine an water. 4. The method of preparing a stencil sheet .which consists in applying a solution'con- .of gelatineion the coated and tempering the gelatine coating and the slsting of gelatine, gly'cerme and water to paper sheet, permitting dry. and form a layer side of the sheet,

one side only of a the coated sheet to material composing the stencil sheet by applying asolution consisting of alum, glycerine and water to both sides of the sheet, and subsequently drying the tempered sheet. v -I In testimony whereof, I have signed my name to this specification.

STERLING ELLIOTT.