US1128200A - Method of treating paper. - Google Patents

Description

.Mzesses/ s. R. WAGG. METHOD OF TREATING PAPER. APPLICATION FILED NOV. 20, 1913.

1, 1 28,200. Patented Feb, 9, 1915.

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-WITED OFFICE- Todlqvkomit may concern: .Be it known that I, SOLOMON B. Waco, a citizen of the UnitedStates, residing at Apleton, in the county of Outagamie and Gate of Wisconsin, have invented new and pseful Improvements .in Methods of- Treat-- fication. 4

The present inventionv has reference .to'the mg Bapenof which the following is'a speci- =treatment of paper, more especially of paper in the form of continuous strips-or webs, the invention comprehending generally, an improved method of treatment, whereby the tensile strength and ink-resistasmuch as it enables the use oflessexpensive sizing.

The new and improved treatment, like the earlier, maybe carried out with or by the aid of any suitable'apparatus, an embodiment of that preferred being shown diagrammatically in the accompanying draw- Tn said drawing, 1 indicates, generally, the strip or web of paper undergoing treatment, and 2 the bath of size, preferably starch through which the same is passed as the initial ste of such-treatment. The web or strip, whichhas previously been subjected to the usual,'preliminary engine sizing, with or without mordants, may be led to the starch size bath either directly from the machine, or afterit has first been dried and reeled up.

On leaving the starch bath, the web 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, beneath and around a smoothed cylinder 6 of polished copper which'serves to initially smooth the-web and to prepare I it for subsequent wet winding. From this cylinder the web passes, successively, to the take-up, smoothing and winding'devi'ces or Specification of Lettersla'tent.

mechanisms.

' sem nar 1}- wace, .91 summon. WISCONSIN. mnrnbn or TREATING rarer.

Patented Feb. 9, 1915.

Application fiied november 2o, 19 13. s ziauvb.-ao2,149.

These devices are, preferably, ofthe types shown and described in my companion application, Serial Number 802,148, v

filed of even date herewith, andthe one first mentigned embodies a spring-pressed roll 8 39d"tt-"iifiing-and-falling dance roll 9., which e .so mounted and arranged as to exert a ic zomplemental, or cooperative action upon ".theweb, the former roll moving forward and backward toward and from the frame wherein the other roll is mounted. Thus the .two rolls work oppositely, and, in their action, insure a continuous and regular feed movement of .the web by preventing breakage, relieving shocks and absorbing slack.

.The Web, as'shown, passes over roll 8 and under r0119, and thence to the smoothing device 22. Reference maybe had to my said companion application fora complete description of this device, and it is, accordingly considered sufiicient for present purposes to state that it consists of a pair of rolls arranged ata forwardly-directed angle to each other, such arrangement causing a stretching and spreading of the web transersely, with the result that .all straight wrinkles and puckers will be smoothed out therefrom.

The action of the smoothing device is supplemented by the winding mechanism, the

drum 7 of which is so'constructed as to provide for the elimination of fine puckers and wrinkles due to the presence of air or air bubbles under the web, to which end its peripheral wall is suitably perforated, so as to break up the bubbles and dissipate the air during the travel of the web over'the drum. The web then passes to the reel 20 whereonv it is wound while still wet.

When the winding operation has been completed, the roll of paper is removed in its wet state from its support, and placed upon a frame 31, where it is allowed to remain for a period of time varying from one to twelve hours, during which time it is kept wet by being covered with. wet cloths 32.

The rest to which the roll of a er is thus subjected, permits a very extend; and grad-- ual permeation of the roll by the starch size, and in-consequence the tensile strength and ink-resisting property of the paper are increased, while, at the same time, the engine size is enabled to set and a'union, soto speak, is produced between the sizes and also the mordants when the latter are used. After restin in the manner just described, the thent oroughly saturated paper is unreeled and the treatment is .either partially or wholly repeated, according to the weight of the paper and other qualities it is desired that it should possess. For example, in making relatively light papers,'the saturated paper is unreeled from the roll and then subjected. to a second sizing treatment, whereupon the paper is passed over a series of hollow rolls33 for its final drying, the rolls being supplied with steam from some suitable source.

In making relatively heavy or very hard sized paper, the paper after the second sizing treatment is preferably wound while wet into a roll and thereby submitted to a sec ond prolonged rest period, whereupon it may be unwound from the roll and dried by passin it over the rolls 33, as before. It is to be 0 served, therefore, that this final drying step does not take place until after the completion of the aforementioned period or periods of rest. In consequence, all danger of injury due to rapid and premature drying, and, generally, to the presence of high heat, is avoided, since such rest has been found from actual practice to render the paper proof against injury of this character. For this reason it has been found perfectly practicable to utilize steam heat, with its relatively very low cost, for drying purposes, in'place of the extremely expensive air-drying which has hitherto been deemed compulsory owing to the danger of injury fromthe high temperatures of steam-heat.

The present invention enables high quality papers to be manufactured with the use of starch sizing,the advantages in its favor, from an economic standpoint, over gelatin and other sizes being too obvious to require extended discussion. On the other hand, however, paper treated in the ordinary manner with starch size has been found practically. worthless, since itofiers unsatisfactory resistance to ink, but when allowed to rest in a wet state, while wound up, in accordance with the present method,.this objection is completely obviated, as the ink-resistance is increased to such an extent that soaking, spreading and creeping of the ink are entirely prevented.

SOLOMUNIR. waste.

Witnesses: I

M. A. SCHUH, JACOB KoEHN.

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