US1644451A - Paper and process of making same - Google Patents

Description

Patented 1927. a UNITED" STATES R Drawing.

My invention relates to an improved I paper and the. method of making the same,

of an improved method and has for one of its objects the provision for producing a grease proof paper.

A still further object of my lnvention 1s the provision of a method for increasing the papers. I

. Briefly my improved process consists in;

treating the various so-called grease-proof papers now in the market so as to increase their grease-proof characteristics, the meth- 0d of my invention being extremely simple and relatively inexpensive so that paper produced by me in accordance with thepresent invention may be sold at a commercially practicable cost to the consumer. v

Different types of paper may be treated by my improved process, as for example, vegetable parchment, which'is a paper made by treating a nearly pure cellulose paper with a certain" concentration of sulfuric acid, followed by thorough washing and drying. I find that even better results are obtained, however, by treating I commercial greaseproof parchment paper, and if' desired, a

poorquality of such parchment paper. Such a parchment paper is made from wood pulp,

bleached or unbleached, and owes such grease-proof characteristics as it possesses to the fact that apart of the cellulose has been converted to cellulose hydrate by se- \ere beating and jordaning to such a dejthe parchment, such as -t for example, .will cause. bhsters to form onthe surface of the parchment. Except for gree that the sudden appliaatlifigiocfahggicgi e a this severity of treatment, which gives a stock which parts with its water with difficulty, containing more or less gelatinous material derived from the ulp andoften termed cellulose mucilag e, t e methods emruns. AND. rnocnss or llEAKING shun.

PATENT OFFICE.

' morn A. smn, or IPASSAIC, NEW JERSEY,'ASSIGNOR T0 zrnn HAMERSLEY MANU- FACTURING-GOMIEANY, or GARFIELD, NEW JnnsnY, A amroBA'rIoN on NEW Application filed August 15, 1925. Serial m. 50,489.

ployed in making such allyemployed in paper making.

My improved process consists in taking any of the papers above referred to by way of example, or any other suitable paper, and before the same has been dried or after it paper are those usuhas been partially dried passing the paper I through a starch solution, maintained at a temperature depending upon, results desired. In other words, the hotter the solution the more the penetration obtained. I

"have obtained satisfactory results by maintaining temperatures varying from 120 F. to 212 F. After treatment in the starch solution bath the paper is passed between squeeze rolls, to limit the amount of solution left on the sheet and to assist penetraheated rollers or in any other'convenient manner. This completes the process, sub sequent calendering being optional.

The starch solution employed is variable depending upon the grades of starch employed-as well as upontlie results desired. For example, I have obtained excellent results by using starch giving a rather viscous solution with concentration" as low as tion. The paper is then dried in any suitable manner, as by passing the same over' two per cent. On the other hand, good results have been obtained by employing a twenty per cent solution of a thin-boilin starch. In employing one grade of stare the higher the concentration the greater is the retention of starch on the paper being treated, with a proportionate increase in grease-proof characteristics. observation, Iwould say that a solution of from eighteen to twenty per cent concentration of a thin-boiling. starch known as a starch gum or dextrine is probably the most satisfactory. However, I do not wish to be" limited to the exactsolutions mentioned, in-

asmuch as I believe higher concentrations to From actual will be found satisfactory and commercially practicable, which will reduce drying costs and possibly produce a better quality 0 paper.

' materials is within the urview of my invention. For example, may desire to increase the-softness and flexibility of the finished product and such results can be obtained by the addition of hygroscopic substances to the starch solution, such as magnesium chloride, calcium chloride, glycerine, etc. The water resistance of the paper may be increased by the addition of rosin size and aluminum sulfate to the starch solution, while formaldehyde benzoate of soda, etc., may be added as preservatives and phenol,

1 etc., as antiseptics.

What I claim is 1. As an article of manufacture, a'paper containing starch, a part of the cellulose of i the paper having been converted into cellu- N lose hvdrate.

2. As an article of manufacture, a paper containing not less than substantially two per cent (2%) by weight of starch and in which paper a part of the cellulose has been converted into cellulose hydrate.

3. The process which consists in beating and jordaningpulp to convert a part of its cellulose to cellulose hydrate and passing the resulting product through a starch solution bath. I p

4. The process which consists in beating and jordaning pulp to convert a part of its cellulose to cellulose hydrate, passing the resulting product through a starch .solution maintained at a temperature ranging from 120 F. to 212 F., pressing, and then dry- 1 This specification signed this 12th day-of August, 1925.

HABOLD A. SMITH.