US1490523A - Process of manufacturing paper - Google Patents

Description

Patented Apr. 15, 1924.

UNITED STATES 1,490,523 PATENT OFFICE.

LOGAN G. THOMSON, OF CINCINNATI, OHIO, ASSIGNOR TO THE CHAMPION COATED PAPER COMPANY, OF HAMILTON, OHIO, A CORPORATION OF OHIO.

PROCESS OF MANUFACTURING PAPER.

No Drawing.

To all whom it may concern:

Be it known that I, LOGAN G. THOMSON, a citizen of the United States, of Cincinnati, in the county of Hamilton and State of Ohio, have invented a certain new and useful Process of Manufacturing Paper, of which the following is a full, clear, and exactdescription.

My invention relates to processes of imparting softness and flexibility to coated paper by incorporation intdj'the paper of slow drying or slow' solidifying material.

A considerable use has sprung up for coated paper for use in advertising circulars which are folded and mailed without protecting boards and are thus subjected to strains, which paper made from wood pulp has not been found capable of withstanding.

The requirements, so far as I am advised, have demanded a paper rich in rag content and hence expensive as compared, for example, to sulphite pulp. A sulphite paper is tinny and brittle to a certain extent and the coating or glaze thereon will crack and the body of the fibre fracture upon the folding of a circular for mailing, as in the above cited instance.

It is the object of my invention to incorporate into a sulphite or other wood pulp paper more particularly, but into any form of paper generally, what may be termed a size of a slow drying or slow solidifying substance, so that upon coating the paper, the

non-drying content in the body stock will give flexibility and softness even aftercoating a very strong, raw stock containing a large proportion of sulphite pulp. I accomplish my process in details as will be pointed out below and duly claimed.

I make up the paper in any desired way on any machine that is used in the paper business, the main ingredient. According toone way of making the paper, I run it through the machine exactly as in the usual practice and after it is ready for coating I pass it through a process similar to the usual coating where I flow onto the paper, in the same way as the-.usual-coating is imposed, a quantity of some slow solidifying substance, such as glycerine, or other oily substance of like character, so far as solidifying is concerned. According 'to one method I dissolve the glycerine in water, one part glycerine to four parts water by volume and the coating ma and a residentof the machine,

using preferably sulphite pulp as Application filed March 14, 1921. Serial No.452,259.

chine and subsequent drying apparatus removes thewater, leaving the proper amount of glycerine.

In controlling the flow and percentage of water used with glycerine and the operation I have used enough glycerine, for example, as to put into the paper about fourteen percent, by weight of glycerinc, and I find that this glycerine will not dry out of the paper due to the drying action, above mentioned.

The paper so filled with glycerine I may then store for some days or immediately pass to a coating machine where the usual coating is added and such calendering is done as may be desired. The coating may be chinaclay, or such other coating as is desired to give the wished for enamel-like or glossy surface to the paper.

According to another method I may tub size the paper with the glycerine while in the process of manufacture, as for example, in the usualFourdrinier machine of the present time, and in this tub sizing process take such precaution as may be necessary to prevent stickiness of the paper, due to the glycerine as it passes through the final drying rolls of the machine, such as, for example, blowing the web with hot air before it strikes the next drier.

'My process is regulated so as to insure the positioning within the fibrous structure of the paper of a glycerine-like substance, which paper may then be coated without destroying the soft and pliable quality.

Having thus described my invention, what I claim. as new and desire to secure by'LettersP-atent, is

1. A process of forming paper, which consists in first making a web of paper, then incorporating into said web around fourteen per cent of glycerine by weight, and then coating the paper with an enamel-like coating adapted to retain the non-drying substance in the paper.

2. A process of forming paper, which consists in first makin a web of paper from a large percentage 0 sulphite pulp, then inco crating into said web. a quantity of glycerine, and then coating the paper with an enamel-like coating adapted to retain the non-drying substance in the paper.

3. A process of forming paper, which consists in first making a web of paper from a large percentage of sulphite pulp, then ineorporating into said Web around fourteen per cent of glycerine by Weight and then coating the paper With an enamel-like e0ating adapted to retain the non-drying sub- 5 stance in the paper.

4. A finished paper. comprising mainly sulphite pulp formed into paper in the desired Way, a quantity of a relatively nonsaid paper.

LUGAN G. THOMSQN.