US1781928A - Paper-making machine - Google Patents

Description

28 l,781,9 H; LIE'BECK m CH ER MAKING MA 18, 193 PAP Nov.

8 '7. 192 Filed Sept. 2

nvemor L /aback. Harry 6 or the machine in Patented Nov. 18, 1930 UNITED STATES PATENT orncr:

HARRY LIEBECK, OF SWARTHMORE, PENNSYLVANIA, ASSIGNOR 1'0 SCOTT PAPER COMPANY, A CORPORATION OF PENNSYLVANIA PAPER-MARIN G MACHINE Application filed September 27, 1928. Serial No. 808,698.

The object of my invention is to provide means for use in a F ourdrinier machine to maintain the fibrous paper stock floating above the wire apron at the breast roll end such a sutfici'ency of water that every opportunit shall be given for the fibers of the stock to liecome arranged in interlocking relation to impart increased strength to the paper transversely or in direction of the width of the web over what is possible with machines of this class as heretofore constructed.

It is known that when paper making machines are run at a relatively high speed, the tendency is to cause the stock fibers to largely lie longitudinally of the web, and where the web is of a lightweight grade, as in the case of toilet or tissue papers, the quantity of fiber is small and the tendency to tear in the direction of the length of the web is pronounced; and to reduce this defect the tube rolls and wire apron must be violently shaken in a transverse direction with an endeavor to cause a sufiicient quantity of the fibers to assume a transverse position. This attempt is uncertain and costly and imposes great wear and tear upon the machine.

One of the principal causes of inefliciency in such attempts is due to the lack of sufficient water above the wire apron at the breast roll end of the machine where the paper stock is supplied to'the apron. To insurea sufficient body of fluid would necessitate too much stock being fed from the head box, as well as too much longitudinal flow and too great a speed of flow over the apron; consequently, mere adjustments of flow and shaking have not proved effective in overcoming the diflieulties.

My invention compreheuds additions to the table and tube rolls of a Fourdrinier machine, which shall secure the following benefits: Means are provided transversely in the table and between the tube rolls thereof, which shall, to a large extent, damthe free flow of the waterthrough the wire apron and between the tube rolls; ranged below the apron and upper level of the tube rolls to prevent the upward return of waste water (which has drained through and additional means are-arand below the apron), again to the apron by the rotating tube rolls. While it is most desirable to retain a large body of stock charged wire apron, it is not desirable to return water which has been depleted of its fiber stock, since such return will dilute the thin stock to an objectionable degree. My improvements function to restrict the flow of water from the stock through the apron between the table rolls and to prevent the return of water (which has passed from the apron) by the rotation of the table rolls, with the result that I am enabled to build up above the apron, at the breast end of the fourdrinier, a depth of full strength pulp, the stock fibers of which are free to adjust themselves transversely shaking manipulation of the table and wire, as usually carried on.

y invention will be better understood by reference to the drawings, in which Fig. l isa longitudinal vertical sectional View of the end of a Fourdrinier paper making machine illustrating the arrangement of the table rolls and wire apron adjacent to the breast roll and head box end, the same embodying my improvements; and Fig, 2 is a perspective view of a portion of Fig. 1, and illustrates my improvements.

2 represents the breast end of the wire apron of a Fourdrinier machine, 3 is the breast roll, 4 is the head-box, and 5 is the shoe for supplying the paper pulp from the head-box to the apron above the breast roll. These parts may be constructed in the usual manner.

6 represents the tube or table rolls which extend, as usua transversely of the table and wire apron, they directly supporting the apron during its travel. rolls are positioned so as port the apron 2, but the theaxes of adjacent rolls is to properly supdistance between so great that the water of the paper pulp flowing above. the

apron may freely pass through the interstices of the woven wire and thuscause the fibrous pulp above the apron to be so quickly depleted of fluid that the fibers do not have the proper opportunity to readjust themselves transversely in the normal operaunder reasonable Usually, the tube tion of the machine, and consequently the general arrangement of the fibers of the paper pulp 1s longltudinal of the web and the apron upon which it is formed. 10 represents one of the deckle straps or bands which are employed to form traveling sides to the apron and confine the paper pulp to insure the web of paper being of a predetermined width.

All of the parts so far described are common to paper making machines, but cooperate with my improvements to secure the advantages hereinbefore enumerated.

I arrange transversely of the table and parallel to the tube rolls a plurality of plates 7, each plate supported on the level of the underside of the apron and in a plane common to the tops of all of the tube rolls, and said plates positioned between-each pair of tube rolls. In this manner, the wire apron 2 is supported not only by the tube rolls but by the plates 7 intermediate of them, and moreover, the width of these plates 7 is such that they largely close the space below the apron and intermediate of the rolls and this is assured by bevelling the under edges of the plates adjacent to the rolls, so that water cannot freely flow'through and away from the apron.

In practice, I prefer to form the plates 7 of hard rubber, vulcanite, bakelite, or other material providing a hard smooth surface over which the wire apron may travel without excessive wear either to the wire or to the plates. These plates 7 may be supported in any suitable manner upon the table orframe in which the tube rolls are journaled, so that said plates maintain their definite relations to the tube rolls during the shale ing of the table with the normal operation of the machine.

A suitable manner of supporting the transverse plates 7 is shown more fully in Fig. 2, in which said plates are secured to the upper flanges of light rolled beams 8 of T cross section, the said transverse beams being secured at their ends to the sides of the shaking table and forming, as it were, a part of said table.

Notwithstanding that the plates 7 form a closure to a large extent to the wire apron between two adjacent tube rolls, there is, nevertheless, space for the downward passage of some water through the apron, and as this water will flow downward upon the roll itself, the rapid rotary motion of said roll will have a tendency to carry the water around with it and throw said water upward on the rising side, so as to tend to return more or less of said water to the apron. To prevent this action, I provide a transverse plate 9 at the rising side of the rolls and acting, ina measure, as a scraper for interfering with the upward flow of the water with the roll and causing it to be dislodged and transverse plate may be of very light sheet material and bent in angle shape in cross sec tion, the flange of the same being bolted to the vertical web of the T shaped transverse beam 8, heretofore referred to. It is not desirable that this scraper 9 shall touch the tube roll, but it may be positioned sufiiciently close thereto that the main body of water being .carried upward by the roll will be thrown against the edge of the said scraper plate and 'prevent it from passing upward. By these two adjuncts, namely, the plate 7 and, the scraper 9, the normal paper pulp above the wire apron is prevented from becoming too quickly depleted of its water, and secondly, such water as may pass through the screen and thereby filtered of its fiber is prevented from being returned to dilute the pulp. in this manner, I am enabled to hold a sufficient depth of pulp flowing above the wire apron adjacent to the breast roll, whereby under the shaking action of the table, the fibers of said pulp will have every opportunity to readjust themselves relatively to each other within the water body.

It will be understood that the flow of paper pulp from the head-box to the apron is adjusted to maintain the desired level above the apron to compensate for any water which escapes through the apron, but this maintenance of a relatively deep body of paper pulp above the apron is only desired at the breast end of the fourdrinier, and consequently the end of the machine approaching the couch rolls and distant from the breast roll may be constructed in the ordinary manner withoutthe use of my improved transverse closure plates 7, thisbeing indicated by the lack of these plates at the left hand portion of Fig. 1.

The invention, therefore, consists more particularly in the provision of the transverse closure plates or tables 7 placed between the tube rolls to control the flow of water or drainage. prolonging it as desired, according to the relative positions of the tube rolls, and so operatii'ig that the water and stock constituting the pulp are fed ontothe wire apron and held there, as it were, until the readjustment of the fibers of the paper to be formed is completed.

It will now be apparent that I have devised a novel and useful construction which embodies the features of advantage enumerated as desirable, and while I have in the present instance shown and described the preferred embodiment thereof which has been found in practice to give satisfactory and reliable results, it to be understod that I do not restrict myself to the details as the same are susceptible of modification in various particulars, without departing from the spirit or SCTiEO of the invention.

aving now described my invention, what I claim and desire secure by Letters Patent 1. In apaper makin machine of the Fourdrinier type, the c om ination with a wire apron, t'ube rolls, press roll and head-box,- with a plurality of transversel arranged closure plates intermediate of jacent tube rolls to provide obstruction to th How of water through the apron and downward betweenv the tube rolls, said closure plates formed of nonmetallic material. and upon which the apron is supported and 'ded, and transversely arran d metallic g i mes sustained at their emf; and formin an intermediate support for the nonm'eta 'c closure plates.

2. The invention accordin to claim 1,

wherein further, the non-meta c sup rtin plates are arranged intermediate ofthe table rolls and are respectively provided with deflecting plates adjacent to the upwardly travelling-surface of the table rolls and extending toward but out of contact with the "table rolls' whereb water centri thrown upward by t e table rolls will be deflected away from the closure plates.

3.v In a paper making machine of the Fourdrinier type, the combination with a wire apron, tube rolls, press roll and head-box, with a plurality of transversely arr closure plates intermediate of adjacent tu rolls to provide obstruction to the flow of water drinier type, the com throu hv the apron and downward between the tu e rolls, said closure plates having their upper surfaces on a le'vel with the tops of the tube rolls and havin their forward and rear edges bevelled on t eir undersides to form bevelled edges fitting over the adjacent tube rolls, and said closure plates further provided with transverse supportin means arranged under them intermediate 0 the tube rolls and sustained at their opposite ends.

4. In a paper makingml'achine of the Fourination with a wire apron, tube rolls, press roll and head-box,

' with a plurality of transversely arranged closure plates intermediate of adjacent tube rolls to provide obstructionto the flow of water through the apron and 'downwardbetween the tube rolls, and su porting plates arranged between the tubero and supported at their V opposite ends, said supporting platesfurther provided with deflecting plates adjacent to the upwardly travelling surface of the table rolls and extending toward but out of contact with the table rolls, whereby water centrifugally thrown upward by the table rolls will be deflected away from the closure lates.

In testimony of which invention, hereunto set my hand. HARRY: LIEBEQK.

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