US1355542A - Stencil - Google Patents

Description

' UNITED STATES PATENT OFFICE.

WILLIAM L. DECKER, OF GREAT KILLS, NEW YORK.

STENCIL.

No Drawing.

To all whom it concern.

Be it known that WILLIAM L. DECKER, a citizen of-the United States, and resident of Great Kills, in the county of Richmond and State of New York, have invented certain new and useful Improvements in Stencils, of which the following is a specification.

This invention relates to stencil sheets for use in the reproduction of typewritten matter impressed therein, and my improvement refers particularly to certain novel combinations of constituent elements employed by me in the treatment of paper adapted for stencil use; to the steps of the process com prehending the treatment, and also to the new product which is the result of such treatment.

While the art involved in the manufacture of stencils has made considerable progress, certain disadvantages are still experienced with the products at present in the market, viz: that the treatment applied tothe sheets takes a very long time to approach the state of dryness suitable for stencil use; and that if left supple enough for the production thereon of good stenciling impressions, the surfaces of the sheets are prone through their moist and tacky condition to adhere to the platen or types of the machine by which the impressions are created therein. Generally speaking, also, I have found stencil sheets which are purchasable to be lacking in strength or tou hness, and others having a tendency to bar en to a point where they do not efliciently receive type impressions.

Therefore, the objects of my invention are to prepare stencil sheets in such a way that they will dry to a usable state within a few hours after treatment, or even in considerably less time than that; that when so dried the sheets will have and retain a high degree of strength or toughness, the treatment adding to the original tenacity of the sheet comprising the base of the stencil, which may be yoshino or other suitable material; and still further, that the produced stencil will have and vmaintain the quality of extreme suppleness, with a smooth, velvety" surface that is quite devoid of tackiness, while the structure of the stencil is impervi ous to ink and oil.-

With these and other objects in view, I

Specification of Letters Patent,

' coalesce and form insoluble lumps.

when the powder has been dissolved, I add prepare a solution of shellac, gum turpentme and soda, which is devised in the proportions of approximately an ounce each of the shellac, gum turpentine and soda, to a pint of water. This mixture is'boiled for about ten minutes or until the stated ingredients are completely dissolved. Then,

while the above solution is still boiling I add thereto a solution of fish isinglass, and continue to boil the combined solution for another five or ten minutes. It will be understood ,that the isinglass solution had been prepared in readiness for its incorporation at the proper time in the first named solution. Said isinglass solution consists offrom one half ounce to one ounce of fish isinglass to a quarter pint of Warm water.

When the combined solution has been boiled for the stated period, I then allow casein and borax should be placed at once in the water the particles of powder ,Would But,

about six ounces of glycerin to that solution and stir the whole mixture well together.

There have thus now been produced two separate solutions, the one, which I will call solution No. 1, including shellac, gum tur-' pentine, soda and fish isinglass, and the 'other, which I will call solution N0. 2, in-

and

eluding casein, borax and glycerin; the next step in the process consists in pouring solution No. 2 into solution No. 1-while the latter is still hot, though moderated in temperature after having been boiled. These united solutions Nos. 1 and 2, which together I will call solution No. 3, are then stirred 'or shaken violently together until thickened Patented Oct. 12, 1920.

Application fiIed JuIy 29, 1919. Serial No. 314,172.

or emulsified, after which solution No. 3 is oif for a time,

Before making use of solution No. 3 in the preparation of stencil sheets, I cause it to be heated up to a temperature of about 100 F then allowing it to cool off slightly, say to about 80 F by which time a scum will be found to have formed upon the surface of the solution. This scum is then to be removed, which is easily accomplished, because it is in the form of a skin or gelatinous film, and can be taken ofl in a single piece. I

The solution No. 3 may be put into service either while still warm, or when cold. It is applied to the yoshino or other like paper either by dipping the sheet in the solution or by spraying the solution over the sheet, or inother known manner. I find that if the solution is applied while warm itmore thoroughly penetrates the interstices of the sheet material; but good results are also obtainable with the solution cold.

The saturated stencil sheets may be hung up to dry, the drying operation occupying not over two or three hours, and sometimes a much shorter period, depending upon the state of the atmosphere.

In some instances the drying process may i be hastened, by passing the stencils between 20% and water 60%.

, 4, when formed, I may rubber rollers, wet wlth a drying solution,

which I will call solution No; 4, and which consists of sugar of lead, alum, glycerin and water, in the approximate proportions of sugar of lead 10%, alum 10%, glycerin Tothis solution No.

add acetic acid in the proportion of one ounce 'of aceticacid to a pint of said solution, comprehending a final drying solution which I will call solution Excellent drying results have been obtained by me with each of the solutions Nos. 4 and 5.

As a, modification of the above described process, wherein solution No. 3 is first applied to the paper in the productionof a stencil, I may make a combined bath of solutions Nos. 3 and 4, and treat the paper therewith in a single operation; or,instead, I may make a combined bath of'solutions Nos. 3 and 5, with which to treat the paper in a single operation.

When either of these combined solutions is employed the treatment should be applied to the paper within a'relatively short period from the time of their'preparation, in order that the reactions which occur either when solution No. 4 is added to solution No. 3, or when solution No. 5 is added to solution No. 3 may not have had time to neutralize the surfacing influence of either borax. and glycerin,

or a composite of alum and sugar of 'lead;

the glycerin being included to import into the product the quality of suppleness or softness, and the borax acts as a preservative.-

I claim 1. The new stencil which consists of loose fibered paper containing casein as a filler, and a binding agent.

' 2. The new stencil which consists of loose paper containing casein as a filler, and a preserving agent.

3. The new stencil which consists of loose fibered paper containing casein as a filler, and a drying agent.

4. The new stencil which consists of loose fibered paper containing casein as a filler, a binding agent, a preserving agent, and a drying agent.

5. The new stencil which consists of loose fibered paper containing casein as a filler, a binding agent, a preserving agent, a softening agent, and a drying agent.

6. The new stencil which consists of loose fibered paper containing casein, borax, slliellac, gum-turpentine, soda, and fish ising ass. v

7. The new stencil which consists of loose fibered paper containing casein, borax, shellac, gum-turpentine, soda, fish isinglass, sugar of lead, alum, a'nd,glycerin.

8. The method of making stencilswhich consists in treating a sheet of loose fibered paper with a filling solution of casein, and with a binding agent, a preserving agent, a softening agent, and a drying agent, substantially as herein set forth.

9; The method of making stencils which consists in preparing a solution of shellac and gum turpentine, boiling said solution and adding thereto a solution of fish isinglass, allowing the combined solution-to cool OE, and, when at moderate temperature, adding thereto a solution of casein powder,

emulsifying the resultj ing compound solution, subsequently treating a sheet of loose fibered solution, and finally 10. The method of making stencils which consists in preparing a solution of shellac and gum turpentine, boiling said solution and adding thereto a solution,of fish isinglass, allowing the combined solution to cool paper with said drying said sheet.

off, and, when at moderate temperature, ad-

ding thereto a solution of casein powder, borax and glycerin", emulsifying the resulting' compound solution, allowing said compound solution to stand and cool off until a skin or film is formed on its surface, removing said skin or film, subsequently treat- Signed at Great Kills in the county of 10 Richmond and State of New York this 25th day of July A.

D. 1919. WILLIAM L. DECKER.