US1818712A - Method of and apparatus for making paper - Google Patents

Description

Aug. 11, 1931. A. M. HINKSON 1,818,712

METHOD OF AND APPARATUS FOR MAKING PAPER Filed March 1,. 1926 (Rho mm Patented Aug. 11, 1931 UNITED STATES PATENT OFFICE ADELBERT M. HINKSON, OF MADAWASKA, MAINE, ASSIGNOR, BY MESNE ASSIGNMENTS, TO PAPER MACHINERY CORPORATION, OF DAYTON, OHIO, A CORPORATION OF OHIO METHOD OF AND APPARATUS FOR MAKING PAPER Application filed March 1, 1926. Serial No. 91,495. v

This invention relates to the manufacture of paper, and particularly to that portlon of the manufacture which-has to do with the forming of the paper making fibres into a sheet.

This invention has to do particularly with that method of making paper in which paper making stock is brought onto a wlre, lateral spread of the stock being limited to secure c the formation of a sheet of paper of the desired width. And one ofthe principal objects of the invention is to provide a method of controlling the lateral spread of the stock, in which the cumbersome and objectlonable '15 deckle straps heretofore used are completely dispensed with, and the desired control of the lateral spread is effected in a very slmple and yet effective manner.

Another object of the inventionis to prose vide apparatus for carrying out thls method.

Other objects and advantages of the nvention will be apparent from the descrlption thereof set out below, when taken in connection with the accompanying drawings.

Although the invention is, of course, not necessarily so limited, as showing a preferred embodiment it is illustrated in connection with a Fourdrinier type of paper making machine,in which the paper forming stock comprising suitable fibrous materials suspended in water is flowed onto a movlng wire, through which the water of the stock escapes leaving the fibres, suitably interlaced, to form the desired sheet of paper. And in the drawings,in which such preferred embodiment is illustrated, and in which like characters of reference designate like parts throughout the several views thereof Fig. 1 is a side elevation, with some parts removed to more clearly illustrate the construction, of the breast roll end of a Fourdrinier machine, comprising apparatus con? structed in accordance with the present invention- Fig. 2 is a plan view, with parts broken away to more clearly illustrate the invention, of the apparatus shown in Fig. 1; and

Fig. 3 is a detail enlarged vertical sectional view, along the line 33 of Fig. 1. p

In the conventional type of F ourdrinier ing the wire at such an angle that the rate offlow of the stock under the action of gravity will be at substantially the speed of the wire. Or it may. be done by the use of what is generally known in the trade as a FVoith inlet; in which the paper forming stock is flowed onto the wire through an orifice, under such head that its velocity of flow as it passes through the orifice is substantially the same 'as the speed of travel of the wire.

For purposes of description the invention is illustrated herein in connection with a Fourdrinier paper forming part, having an inlet of the Voith type. In the drawings the numeral 10 designates the traveling wire the numeral 11 designating the breast roll, which is at the stock inlet end of the F ourdrinier part and which is designated generally by the numeral 12. The other end of the wire, of course, is supported in the usual manner by a couch roll, there being suitable table rolls 13, tension rolls (not shown), and the like, the particular construction of which is of noespecial moment in so far as concerns the present invention. The wire travels in the direction of the arrow A in Fig. 1.

Mounted immediately adjacent the breast roll 11 is the flow box 20, of a Voith inlet. The front wall of this flow box is provided with an opening shown b dotted lines at 21, and extending across the ront of the flow box. The lower floor of the flow box is extended, as shown by the numeral 22, to form a lip to partly overhang the breast roll 11. As will be noted, particularly from Fig. 1, however,this extended floor or lip terminates short of the vertical diameter of the breast roll. Movably mounted along the upper edge of the opening 21 is a plate 23, which may be swung up or down by means of the mechanism designated generally by the numeral 24, of well known construction and operable in a well known manner, to vary the effective height opening of the delivery orifiee25, through which the paper forming stock escapes from the flow box 20 onto the wire.

Attached to the front of the fiow box, on each side, is an angular plate which comprises a back face 30, which is suitably bolted to the front face of the flow box, a lower face 31 at right angles to the face 30, and which is suitably bolted to the floor extension 22 ofthe flow box, and anupright portion 32, which extends vertically a suificient distance to completely overlie the end of the movable plate 23, to thus close off the end of the space between the extension 22 and the plate 23, and so prevent the escape of stock from the flow box, except through the orifice 25. Both the portions 30 and 31 are provided with transverse slots, through which extend bolts 33 by means of which these members are firmly bolted in place. And by means of this construction these parts may be moved laterally of the flow box to give the desired nicety of adjustment. As clearly shown in Figs. 1 and 2 the horizontally arranged member 31 is substantially co-extensive with the lip 22 and the movable plate 23. But the upright portion 32 extends out a substantial distance beyond the orifice 25. As will be noted, particularly in Fig. 1, this extended portion of the vertical member 32 overhangs the breast roll 11, and extends a considerable distance beyond the vertical diameter of the breast ro Carried by the extended portions of these vertical members 32 is an apron 40, which extends entirely across the orifice 25, and cooperates with the lip 22, acting as an extension of that lip so that the paper forming stock flowing from the orifice will be delivered upon the wire from this apron, and thus beyond the vertical diameter of the breast roll. This apron is preferably attached to the vertical member 32, at each end, by means of plates 41, which are suitably held clamped tightly in place by means of bolts 4.2. This apron 10 is preferably of flexible material, such as rubber, which will readily adapt itself to the face of the wire, without causing material wear. Clamped to the inner face of each member 32, by means of a plate 43, is a flexible strip 44, the lower edge of which extends downwardly into contact with the apron 40.

This arrangement is such that as the paper .forming stock issues from the orifice 25 under considerable velocity, due to the head maintained within the flow box 20 it not only flows rapidly across the apron onto the wire, but adjacent the outer ends of the orifice tends to likewise spread materially at the considerable velocity. It is quite ordinary practice tooperate paper making machines of this character with a wire speed of 300 to 500 feet per minuter-and with machines for making news print paper it is not at all unusual to have the wire travel at a speed up to 1000 feet per minute. And in each instance the paper forming stock will be flowed from the orifice under a velocity equal, orapproximating, the speed of travel of the wire. It was the umversal practice in the industry, prior to the invention of Ralph E. Heisel, which is disclosed in his application 32,688, filed May 25, 1925,,nowlatent No. 1,679,523, granted August 7, 1928, to limit the lateral spread of the stock as it flowed onto the wire, by the use of deckle straps. These deckle straps consisted of large rubber straps or belts generally rectangular in cross section which rested upon the wire and were supported on pulleys at opposite ends of the wire, the straps bemg endless and traveling with the wire upon the pulleys. Each of these straps constitutes in effect a flexible wall, extending throughout the paper forming part of the wire and limit ing the spread of the stock. The aforesald invention of Heisel, as disclosed in his appl1- cation above designated, constitutes the first departure in the industry from this heretofore universal practice,the first successful method of manufacturing paper without the use of conventional decking means. In the present invention all means for limiting the lateral spread of the stock are dispensed with except in the zone immediately adjacent the orifice through which the stock is flowed onto the wire. It will be noted, from the dimensions given above, that positive restraint of the lateral spread of the stock is limited to a zone, a few inches in width, immediately adj acent the orifice through which the stock flows on to the wire. And this limiting of the lateral spread of the stock, just as it flows at considerable velocity from the orifice, is effective to prevent subsequent lateral spread of the stock upon the wire, so that, by limiting 1 the spread of the stock only within the zone which is adjacent the orifice, the ultimate width of the sheet of paper is controlled. The

precise extent beyond the orifice of the limiting parts associated therewith may be varied; but very satisfactory results have been obtained where the parts 32, and the apron 40, extended beyond the orifice only seven to eight inches with a wire speed, ranging from 200 feet to 400 feet per minute. l/Vith parts of these dimensions and under such wire speeds-completely satisfactory limiting of the spread'of the stock is secured. But these dimensions are intended merely as illustrative of dimensions that have functioned satisfactorily in the commercial manufacture of paper; and are not meant to be in any way a limitation. For they may be varied-in fact may necessarily have to be varied with other wire speeds; but naturally a narrow apron is more desirable than a broader one. But only a few inches is needed to cause the apron to extend beyond the vertical axis of the breast roll.

In actual practice, with a device constructits ed as shown in the drawings, there seems to be not only a positive limiting of the lateral spread of the stock as it flows at considerable velocity from the orifice, but an actual deflecting of part of the stock back toward the center of the wire or the setting up of a swirling motion or wave for as machines equipped with the device illustrated operate it is noticed that ripples form in the flowing stock which follow substantially the lines shown in Fig. 2, and designated by the numeral B.

As the sheet of formed paper passes over the suction box. and thence under the dandy roll, the paper is cut to the desired width and to give it a clean edge, by means of fine streams of water. But as all these members are well known, and have been heretofore generally used for the same purpose they are not shown in the drawings and no further description is thought necessary.

While the form of apparatus herein described constitutes a preferred embodiment of the invention, it is to be understood that the invention is not limited to this precise form of apparatus, and that changes may be made therein without departing from the scope of the invention which is defined in the appended claims.

What is claimed is:

1. In the making of paper in apparatus having a forming wire, the method which consists in flowing paper forming stock upon said wire through an orifice and positively limiting lateral spread of stock upon said wire only within the zone adjacent the orifice.

2. In paper making apparatus adapted to operate without the conventional deckle straps, a forming wire, means for flowing paper making stock upon the wire having an orifice through which the stock flows onto the wire, and means associated with said orifice and forming wire for positively limiting lateralspread of the stock upon said wire only within the zone adjacent the orifice.

'Sr-In the making of paper in apparatus having a forming wire and adapted to operate without the conventional deckle straps, themethod which consists in flowing paper forming stock upon the wire through an orifice under substantial velocity and exerting a restraining influence upon said stock as it flows from the orifice to thereby posi-' tively limit lateral spread of the stock upon the Wire only within the zone adjacent the orifice.

4. In paper making apparatus adapted to operate without the conventional deckle straps, a forming wire, means for flowing paper making stock uponthe wire having an orifice through which the stock is flowed on to the Wire, and extensions associated with said orifice at opposite sides of the wire and extending out over the wire toexert a restraining influence upon the stock passing from the orifice within a limited zone adj a- ADELBERT M. HINKSON.

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