US1117113A - Method of treating paper. - Google Patents

Description

S. R. WAGG.

METHOD OF, TREATING PAPER. APPLICATION FILED 001'. 4, 1913.

Patented Nov. 10, 1914.

SOLOMON R. WAGG, OF APPLETON, WISCONSIN.,

METHOD OF TREATING'PAPER.

Specification of Letters Patent.

Application filed October 4, 1913. Serial No. 793,432.

To all whom it may concern..-

Beit known that I, SOLOMON R. Waco, acitizen of the United States, residing at Appleton, in the county of Outagaime and State of Wisconsin, have invented new and.

useful Improvements in'Methods of Treating Paper, of which the following is a specification.

The present invention has reference to the manufacture of paper, and it comprehends an improved method of treatment whereby the tensile strength and ink-resisting property of the paper are greatly increased, the paper will permit erasures 1n ink therefrom, and the quality of the paper is otherwise improved. The improved treatment may be carried out with or by the aid of any suitable apparatus, an embodiment .of that preferred being shown diagrammatically in the accompanying drawing.

In said drawing, 1 indicates, generally,

the strip or web of paper undergoing treat-- ment, and 2 the bath of gelatin or other size through which the same is passed. Thisweb or strip is made from pulp which is subjected to preliminary engine sizing,

' with orwithout mordants, and is preferably led to the gelatin bath directly from the Fourdrinier machine.

On leaving the gelatin bath, thepaper is passed between the rolls 3 and 4:, which serve to squeeze out the excess size therefrom, and from these rolls it is led, while still wet, to the winding mechanism The latter is preferably ofthe type shown and described in my companion a plication, Serial Number 794,101, filed ctober 8, 1913, and embodies a rotating. drum 5 which is driven from any desired source of power,

and from which the paper is fed to a winding reel 6. Prior to reaching the drum, the paper is passed over a suitable take-up device 7 and, also, over a rack'S, the drum being grooved, and the rack of skeleton construction, as fully set forth in my said companion application. Extended description of the parts in question is, therefore, unnecessary, and it is suflicient for present purposes to state that the object of this construction is to smooth out all wrinkles,

' puckers, creases and the like in the wet paper. The take-up device 7 serves to regulate thespeed of the winding drum relative to the upper size roll 4:, as likewise set forth in the application mentioned, to which reference may be had for a complete understanding.

The reel 6 upon which the wet paper is wound fronrthe drum, is mounted in such a manner as to enable the'winding tension to be regulated, the mounting embodying a pair of pivoted arms 9, whereon said ,reel

directly rests, and a link connection 10 between the outer end of each arm and that of an arm 11 which is fast on a horizontal shaft 12 operable by worm gearing 13 controlled by a hand-wheel 14. By meansfof these parts or elements, the reel-supporting arms 9 may be raised or lowered at will, so as to proportionately increase or decrease the tension exerted upon the paper as it is being wound up.

When the winding operation has been completed, the roll of paper is removed in its wet state from the supporting arms and placed upon a frame 15 whereon it is allowed to remain-under normal conditions for a period of time varying from one to twelve hours, during which time it is preferably kept wet by being wrapped or otherwise covered with wet cloths 16. The rest to 'Which the roll of paper is thus subjected, permits a very extended and gradual ermeationfof the roll by the gelatin, an in consequence the tensile strength as well as the ink-resisting property of the paper are increased, while, at the same time, the'engine and gelatin sizes are enabled to set and a union is produced between the same preferred type and is then subjected to the calendering or other finishing step or steps.

The final drying of the paper does not take place until after the completion of the rest to which the wet reel is subjected, as will be understood from the foregoing, during which period the gelatin continues. to soak into and be absorbed by the paper and to unite or combine with the engine sizing previously introduced therein. In this way,

the injurious heating and rapid drying of the-paper immediately after immersion in the gelatin bath are completely avoided, while the .objectionable features of the loft-drying, namely, the expense and delay, are likewise overcome. It may also be stated, in the same connection, that the afore-mentioned soaking or resting step Patented Nov. 10, 1914."

has a further advantage, in that at the conclusion thereof the sized and impregnated web is rendered proof against injury when subjected, subsequently, to steam drying at very high temperature, Whereas without this soaking, the web is so easily injured by high heat'that it has been found practically impossible, heretofore, to utilize steam heat for the final drying. Accordingly, air-drying has generally been followed, but since the cost thereof is so great as compared with steam-drying, the importance of a step or treatment which permits the employment of steam for the purpose indicated will be at once apparent.

The resting and soaking step has been above described as taking place under normal conditions 7. The expression quoted is intended to convey the fact that the step indicated is carried out at the ordinary temperature of the room where the apparatus is located, or, in other words, without the web beingsubjected either to an increased heat or being otherwise afiected by extraneous or abnormal conditions. Also, the web is allowed to stand in its wet state and no movement of any character is imparted to it at such time. The expression mentioned occurs in the appended claims and is to be interpreted in view of the foregoing.

I claim v 1. In the process of manufacturing highgrade paper, the successive steps of producmg an engine-sized web, passing such Web substantially immediately after its removal from the Fourdrinier machine through a bath of a difierent size, Winding the wet web into a roll, allowing the rolled web to rest, in a wet state andunder normal conditions,

for a predetermined extended period of time,

to permit a very gradual and thorough permeation of the web by the size comprising the said bath and a union of the two sizes, and drying the web.

2. Tn the process of manufacturing highgrade paper, the successive steps of producing an engine-sized web, passmg such web substantially immediately after its removal from the Fourdrinier machine through a bathof gelatin size, winding the wet web into a roll, allowing the rolled web to rest, in a wet state and under normal conditions, for a predetermined extended period of time, to permit a very gradual and thorough permeation of the web by the gelatin size and a union of the said gelatin size and the engine size, and drying the web.

In testimony whereof l[ have hereunto set my hand in presence of two subscribing wit- CHAS. S. HYER, v H. C. MOCARETNEY.

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