US1493537A - Method of and apparatus for removing moisture from paper stock - Google Patents

Description

May 13 1924.

A. J. HAUG METHOD OF AND APPARATUS FOR REMOVING MOISTURE FROM PAPER STOCK Filed Jan. 11. 1923 IIIII'IIIIIIII atented May. 13, 1924.

UNITED STATES PATENT OFFICE.

ANTON J. HAUGQOF NASHUA, NEW HAMPSHIRE, ASSIGNOB TO DIPBOVED PAIEB HACHINIEBY COMPANY, OF NASHUA, NEW HAMPSHIRE, A CORPORATION OF MINE.

METHOD OF APPARATUS FOR REMOVING MOISTURE FROM PAPER STOCK.

Application filed January 11, 1828. Serial No. 612,083.

To all whom it may concern:

Be it known that I, ANTON J. Hum, a citizen of the United States, and a resident of Nashua, in the county of Hillsborough and State of New Hampshire, have invented an Improvement in Method of and Apparatus for Removing Moisture from Paper Stock, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts. I

This invention relates to paper making, and more particularly to methods of and apparatus or handling a web or fibre layer while in a moist or formative stage and for removing the excess water therefrom.

The invention will be best understood by reference to the following description when taken in connection with the accompanying illustration showing one s cific application thereof, while its scope W1 1 be more particularly pointed out in the appended claims.

In the drawings,- i

Fig. 1 is a sectional side elevation showingone type of web' forming machine used in connection with one form of the invention; and

Fig. 2 is a longitudinal sectional elevation taken through the expressing roll on the line .2- 2 in Fig. 1.

Referrin to the drawings, I have there shown for illustrative urposes one form of the invention embodied in an apparatus of the type illustrated in my prior Patent No. 1,405,211, dated January 31, 1922, but the same may be adapted to various uses and applied to apparatus of quite dissimilar type.

Referring more articularly to the specific embodiment of t e invention here illustrated, the same com rises a web forming apparatus which emp oys a tank or casing 1 containing the chamber 2, to which the stock may be fed in the usual manner, entering first the delivery chamber 3 and passing over the bafile plate 4 to the tank space 2 where it is delivered to the web carrying surface of the cylindrical screen drum or cylinder mold 5, the latter bein partly immersed in the stock and adapt to rotate in the direction of the arrow. The constructional details of this cylinder mold are immaterial and it may have any of the usual features of apparatus of this class, the water being ordinarily compelled to pass from the exterior of the cylinder to the interior-thereof throu h a suitable foraminous or screening su ace, the screened liquid or white water passing through a suitable discharge orifice (not shown).

In the form of machine shown in Fig. 1, the web forming apparatus also includes the couch roll 6 which rests in direct frictional contact with the cylinder mold. The couch roll may be of any suitable construction which is adapted to remove by pressure and direct contact with the cylinder mold the accumulated wet fibre thereon. It may be constructed, for example, of wood, covered with a woolen or felt jacket of suitable thickness to take up the fibre and to some extent extract the moisture therefrom. The couch roll is preferably driven by frictional engagement with the cylinder mold. The supporting bearings for the couch roll and the cylinder-mold are not herein shown, but may be similar to those described in the aforesaid prior patent.

As the wet fibre sheet passes around the couch "roll it is subjected to the action of means which serve to remove the water from the fibre by expressing the same and causing it to drain away without interference with the continuing travel or advance of the fibre web or sheet. Herein such means is embodied in the form of an expressing roll 7 having a porous or perforated surface and having provision for mechanically pressing the two rolls together, so that the water forced out of the fibre is allowed to drain away in large part through the perforations in the surface of the expressing roll. Preferably the surface of the express ng roll has a greater adhesive attraction for the fibre layer than the couch roll or other sheet carrying member opposed thereto, so that the water is not only expressed and withdrawn by the pressure of the perforated ro'll against the fibre, but the sheet is alsopicked up and carried by the presser roll and further drained in its passage thereover.

I have herein shown an expressing roll capable of withstanding considerable pressure, such, for example, as that described in my aforesaid prior patent, the same comprising a series of splders 8 assembled upon the sleeve 9, the latter mounted on the shaft 10, the circumferential edges of the spiders providing a series of supporting rings covings and supports for the expressing roll and couch roll are not herein shown, but means are preferably provided, such as are illustrated in my aforesaid prior patent, whereby an adjustable pressure may be maintained between the couch roll and the expressing roll as well as between the couch roll and the cylinder mold.

In the apparatus shown in Fig, 1, the

partly drained web passes over the expressing roll and is then engaged between the latter and an imperforate presser roll 12, the latter being preferably so mounted that it may be adjustably pressed toward the expressing roll, and having such a smooth hard surface that the fibre sheet tends to.

adhere thereto and leave the perforated presser roll 7. The web passing tween the upper presser roll 12 and the expressing roll 7 has the remnant moisture effectively expressed therefrom and the water passes down through the perforations of the roll to the interior thereof. Much of the air as well as the moisture is expelled from the web so that the latter clings to the roll 12 and, passing up and around the roll, is stripped therefrom by the doctor blade 13 to be conveyed therefrom to any other desired apparatus or utilized in any other desired way.

In the continued operation of this apparatus there is a tendency for the stock fibres to pass through the small perforations of the perforated expressing roll. tending to accumulate on the interior of the roll and filling or clogging the perforations, thus in terfering with the most efiicient functioning of the roll. To maintain the roll free from such accumulated fibre I have provided the underlying receptacle or trough 14 immediately beneath the expressing roli and adapted to receive the liquid expressed from the web. At each end of the trough there is a |transverse partition wall 15 slightly lower than the edges of the trough, thereby forming at each end an overflow pocket 16, the bottom 17 of the pocket being inclined forwardly, as indicated in dotted lines ill Fig. 1, so that the overflow into the pocket is deflected back into the cylinder mold tank 2. The water expressed from the web maintains the body of liquid in the trough at a level determined by the height of the edge wall 15, and is sufiicient to immerse the lower art of the perforated ex ressing roll, so that the part thereof from which the web has been removed travels freely through the water in the trough. This tends to wash the accumulated fibre free from the perforations and walls of the expressing.

roll. The water draining through the expressing roll from the exterior to the inte rior thereof creates a movement of the liquid from the interior of the roll to the ends so that any stock which has entered the interior of the roll is thereby washed out from the interior of the roll to the ends of the trough and carried back into the cylinder mold tank. The various rolls may be independently driven, but preferably the driving power is applied to the perforated expressing roll, and the remaining rolls and cylinder mold are driven by frictional con tact. The described method permits the handling of a wet web of paper stock and the extraction of the moisture therefrom without the use of a felt carrier.

WVhile I have herein shown and described for the purposes of illustration one specific form of the invention and one specific adaptation thereof, it is to be understood that the same may be varied within wide limits and that it may be usefully applied to widely different forms of machines without departing from the spirit thereof,

Claims:

1. In a bination with a cylinder mold. a tank therefor, a couch roll, a hollow open ended perforated expressing roll pressed against the web on the couch roll and adapted to pick up the web therefrom, an imperforate roll pressed against the web on the expressing roll and adapted to take the web from the expressing roll, said expressing roll being adapted to drain the liquid from the web through the perforations of the roll, and a trough beneath the expressing roll adapted to, receive the liquid expressed from the web and to discharge the same back to the tank, the lower part of said expressing roll being immersed in and traveling through said liquid and the water entering the interior of the roll through the perforations thereof being conveyed through the open ends of the roll and discharged back to the tank, whereby the expressing roll is freed from accumulated fibre.

2. In a paper making apparatus for removing water from paper stock. the combination with a perforated traveling surface, of a cooperative roll, said surface and roll being so related as to permit presentation between them of stock from which the water is to be expressed and the roll and surface being pressed toward each other to express the water from the stock and cause it to pass through the perforations of the surface. means to'remove the stock from the surface, and a receptacle adapted to receive the water so expressed and presenting'a liquid body within the path of the perforatedtraveling surface after the removal of the stock therefrom.

In an apparatus for handling a moist fibre web in paper making, the combination ,with a web carrying surface, of a hollow paper making machine, the comperforated roll pressed toward said surface and against the web thereon and adapted to take the web therefrom, and a trough beneath the roll adapted to receive liquid expressed from the web, the lower part of said roll being immersed in said liquid.

4. In an apparatus for handling a moist fibre web in paper making, the combination with means for conveying a formed web of a perforated hollow expressing roll and a cooperating pressing roll between which the moist fibre web is conveyed and pressed, and a liquid container in which the expressing roll is partly immersed.

5. In a paper making machine, the combination with a cylinder mold, of a couch roll, a hollow perforated expressing roll pressed against the web on the couch roll and adapted to take up the web therefrom, an imperforate roll pressed against the web on the expressing roll and adapted to take the web from the expressing roll, and a receptacle adapted to receive the drained liquid and immerse the lower part of said expressing roll. 1

6. In a paper making machine, the combi nation with a cylinder mold of a couch roll, a hollow perforated expressing roll, and a receptacle adapted to receive the drained liquid and immerse the lower part of said expressing roll.

7. In a paper making machine, the combination with a web carrying surface of a perforated roll adapted to take the web therefrom. a presser roll pressed toward said perforated roll and against the web thereon and adapted to take the web therefrom, and a receptable adapted to receive the drained liquid and immerse the lower part .of said expressing roll therein.

8. In a paper making machine, the combination of a cylinder mold, a couch roll, a hollow perforated expressing roll pressed against the web on the couch roll and adapted to take the web therefrom, an imperfo rate roll pressed against the web on the expressing roll and adapted to take the web from the expressing roll, and means for washing the roll free from accumulated tibre.

9. In a paper making machine, the combi- -of water drained from the web, a

nation of a web carrying surface, a perforated roll adapted to take the web therefrom, a presser roll pressed toward the perforated roll and against the web thereon and adapted to take the web therefrom, and means for washing the perforated roll free from accumulated fibre.

10. In an apparatus for handling a moist fibre web in paper making, the combination with means for conveying the formed web of a perforated hollow expressing roll and a cooperating presser roll between which the moist fibre web is conveyed and pressed, and a liquid container adapted to receive the liquid drained from the expressing roll, the lower part of said roll being immersed in an accumulation of such liquid.

11. In a paper making apparatus for removing water from paper stock, the combination with means for conveying a moist fibre web of a perforated traveling surface and a cooperating roll between which said web is conveyed and pressed, the roll and surface being pressed toward each other to express the water from the web and cause it to pass through the perforations of the surface, the water so expressed gravitating and draining awayfrom the web, and a receptacle adapted to receive the accumulation ortion of said surface when freed from said web traveling through said water, and means to withdraw the excess water therein.

12. The process of draining a continuous web of moist fibre which consists in conveying the, web on a perforated roll, applying pressi u'e to express water from the web, and causing the webless part of the roll to travel through the water drained from the web.

13. The process of draining a continuous web of moist fibre which consists in conveying the web on a perforated traveling surface, applying pressure to express the water therefrom, withdrawing the web from said. surface, and causing the weblessportion of said surface to travel through an accumulation of water drained from the'web.

In testimony whereof, I have signed my name to this specification.

ANTON J. HAUG.

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