US1656766A - Paper-making machine - Google Patents

Description

Jan. 11, 1928.

Ci W. VALENTINE PAPER MAKING MACHINE Filed May 51 1927 6 I (inventor 33 4! flaw/" 4 k /W- Patented Jan. 17, 1928.

UNITED STATES PATENT. oFFics.

CHARLES W. VALENTINE, O1 WATEBTOWN, NEW YORK, ASSIGNOR TO THE BLGLIYJ AND SEWALL comm, WATER-TOWN, NEW

YORK.

YORK, A GOBIOBATION OI NEW PAPEBQKAKING MACHINE.

Application filed Kay 31, 1927. Serial iio. 195,178.

This invention relates to certain improvements in paper making machines.

In the manufacture of a paper web, particularly on fast running machines of the Fourdrinier type, the pulp or stock is delivered from the head box to the wire under what is known as the slice, the web or sheet being formed on this wire. In making pa or on this type of machine, difiiculties are re 1 uently experienced due to the formation of bubbles at the point where the stock discharges under the slice onto the making wire. These bubbles cause spots to appear in the finished sheet which are undesirable. Furthermore, 'in making paper on the Fourdrinier type machine, the stock has a tendency to so arrange itself that the fibers run in one direction, as longitudinally of the stock flow. This tendency of the fibers to 9 arrange themselves lengthwise produces a finished web or sheet having undesirable characteristics, which it is desirable to eliminate.

it is the especial object of the present in- 16 vention to provide an unproved construction by the use of which the objectionable bubbles are eliminated so as to avoid spotty places in the finished sheet, and an intermingling or the stock is obtained so as to overcome a the tendenc of the fibers to arrange themselves lengthwise.

A further object of the present invention is to provide a construction of simple form which can be readily and easily applied to it a Fourdrinier paper making machine.

With these and other objects not specifically referred to in view, the invention consists in certain novel parts, arrangements and combinations which will be described in to connection with the accompanying drawings and the novel features pointed out in the claims hereunto annexed.

lln these drawings,--

Figure l is a side elevation, partly in sectt tion, of a paper making machine embodying the invention;

Figure 2 is a partially broken view of part of the construction shown in Figure 1, this being shown on anenlarged scale;

Figure 3 is a detail view, partly in section and partly broken away, of the mechanism for adjusting the wiper roll, and

Figure 4 is a detail view looking in the direction of arrows 4-4 of Figure 3.

Referring now to these drawings, the machine selected to illustrate the invention is a Fourdrinier machine provided with a head box 1 and" a slice 2, under which the stock is delivered to the making wire 3 of the machine. This making wire passes over the usual breast roll 4:, located beneath the slice, and over table rolls 5 and suction boxes 6 by which the water is removed from the stock to form the sheet, the makin wire also passing over and between couch ro s 7. The making wire also passes over supporting rolls 8 and under adjusting or stretch rolls 9 by which the wire may be kept under the proper tension, all this construction being the usual one in Fourdrinier machines.

In accordance with the invention, means are provided whereby the bubbles formed in the stock may be broken or eliminated, and in the best constructions this is effected by what may be termed a wiping action. In accordance with the invention, therefore, there is provided a carrier inthe form of a roll, and this roll will be hereinafter referred to as a wiper roll, this name having been selected as well expressing the function of this roll, such roll being indicated at 10, and it is mounted above the wire at a suitable point adjacent the slice, the roll being carried on a shaft 11 supported in bearings 12, one of which is illustrated in the drawings, this hearing being carried in a frame 13. The roll 10 extends across the wire. and is provided with a plurality of proections, shown in the form or fins having thin edges which extend across the roll, ockets being formed between the fins. T ese fins are marked 14: in the drawings and are provided in suitable numbers to efi'ect the results desired. Preferably the fins are provided in such numbers that a plurality of them engage with the stock on the wire at the same time.

The fin carrier or wiper roll may be of an suitable material, but preferably this rol will be made of rubber. The roll is a driven roll and means are provided for driving the roll at a predetermined speed with respect to the speed of the stock, the peripheral speed of the roll being slightly less than that of the wire and the stock unit. This roll is rotated in the direction of the flow of the stock and as each of the fins leaves the stock the surface of this fin has a wiping action on the stock surface, thus breaking down any bubbles that may be moving along on the surface of the stock. Various means may be employed for rotating the roll at the desired s eed relatively to the speed of the wire. In the particular construction shown, there is provided a pair of variable speed cones 15, 16 mounted in the frame 13, before referred to, one of these cones, as 15, being connected to the shaft 11 of the wiper roll 10. The pulle 15 is driven from'the ulley 16 by a belt 1 and this belt is shifta 1e to vary the driven speed of the pulley 15 by means of a belt shlfter, indicated at 18. The pulley 16 may be driven from any suitable part of the machine, as by a belt 19 passing over a pulley 20 on the shaft of the cone 16 and a pulley 21 on a shaft 22 of a driving roll 23, this roll being .driven by the makin willie which is driven from the lower coucfi ro With this construction, therefore, the wiper roll 10 may be driven at a speed having a predetermined ratio to the speed of the wire, this being, as before stated, somewhat slightly less than that of the wire. In machines embodying the invention in its best form, means are provided for adjusting the wiper roll to and from the wire. This is conveniently effected by mounting the frame 13 so it can have a sliding movement in bracket 23, this movement being effected by an adjusting screw 24, and the part-s being held 1n ad'usted position in any suitable manner, as by bolts 25,

Machines constructed in accordance with the present invention will include means for effecting a slight mixing or paddling action of the stock on the wire so as to overcome the tendency of the stock to arrange itself lengthwise during the formation of the sheet. While this may be effected in various ways, in the preferred construction this is effected by the wiping roll. It will be observed that this roll is so constructed that a plurality of the fins are in contact with the stock on the wire at the same time. As these fins are movin at a speed slightly less than the speed of the stock on the wire, a slight checkin or retarding action in the movement 0 the stock is effected. The fins enter the stock at the point marked a in Figure 2 and, because these fins move along at a slightly slower speed thansthe stock, there is a tendency of the stock to pile up behind the fins, this retarding action reaching its maximum at the center 6 of the roll, where the .fins dip the dee est into the stock, and being gradually re need at the i int marked a, where the fins leave the stoc This slight checking or retarding of the stock causes an successive the stock.

inter-mingling of the fibers which overcomes the tendency to distribute themselves lengthwise and effects the formation of a better sheet or web of paper.

While the invention has been shown and described in what is believed to be its best form, it will be understood that variations and changes may be made in the construction and arrangement of the wiper roll and in the means for adjusting it and that such chan es are within the scope of the invention as efined in the appended claims.

What I chum is:

1. In a paper making machine, the combination with the making wire, of a rotary carrier mounted aboveithe wire and provided with a plurality of thin edged projections extending widthwise of the carrier and radially from its surface and dipping into the stock on the wire, means for driving the carrier, and means for regulating the speed of the carrier so that it may be given a speed having a predetermined ratio to the speed of the stock on the wire.

2. In apaper making machine, the comhination with the making wire, of a rotary carrier mounted above the wire and provided with a plurality of thin edged projections extending widthwise of the carrier and radially from its surface and dipping into the stock on the wire, means for driving the carrier, and means for regulating the speed of the carrier so that its surface speed is slightly less than the surface speed of the stock on the wire so that-each successive projection has a wiping action on the stock.

3. In a aper making machine. the combination Wlth? the making wire, of a rotary carrier mounted above the wire and provided with a lurality of thin edged projections exten ing widthwise of the carrier and radially from its surface and so arranged that a number of the projections dip in the stock simultaneously, means for rotating the carrier, and means for regulating the s eed of the roll so that its surface speed is s ightly less than the surface speed of the stock on the wire, so that the projections tend to slightly retard the stock and thus produce a mixing action on the stock as each pair of projections move through wire.

5. In a aper making machine, the combination with the making wire, of a roll mounted above the wire and formed with a plurality of thin radial fins dipping into the stock on the wire, means for rotating the roll IZI at esnrface speed having a predetermined 7. A wiping and mix'm roll for Fourratio to the speed of the stock on the wire, drinier paper making macl ines, comprising 1 and means for adjusting the roll toward and a rubber roll provided with a plurality of from the wire. fins thinner at their outer edges than at their 5 6. A wiping and mixin roll for Fourbases.

drinier paper making mac ines, comprising In testimony whereof, I have hereunto set a rubber roll provided with a plurality of my hand. i thin edged fins. v CHARLES W. VALENTINE.

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