US2954082A - Paper machinery - Google Patents

Description

Sept. 27, 1960 LA. MOORE PAPERYMACHINERY 5 Sheets-Sheet 1 Filed May 21 1958 INVENTOR.

LAWRENCE A. MOORE t {i Q N DJ ATTO R N EYS Sept. 27, 1960 L. A.v MOOREY PAPER MACHINERY 3 Sheets-Sheet 2 Filed May 21, 19 58 INVENTOR.

LAWRENCE A. MOORE ATTORNEYS Sept. 27, 1960 Filed May 21, 1958 L. A. MOORE PAPER MACHINERY 3 Sheets-Sheet 3 INVENTOR.

LAWRENCE A. MOORE AT TORN EYS 2,954,082 PAPER MACHINERY Lawrence A. Moore, Watertown, N.Y., assignor' to The Black-Clawson Company, Hamilton, Ohio, at corporation of Ohio I Filed May 21, 1958, Ser. No. 736,777

9 Claims. (Cl. 162-264) also be quickly removed laterally of the machine for,

further disposal such as transfer to a pulper. It is a common practice to provide for this purpose a conveyor extending crosswise of the paper machine adjacent a roll at which a web break is likely to occur, with the objective of directing the web of broke onto such conveyor for transfer to the back side of the machine for further disposal. I-Iowever, the broke accumulates at the same I rate across the entire width of the machine, and it will therefore accumulate on the broke conveyor at an increasingly rapid rate in the direction of travel of the conveyor, since while the broke deposited on the conveyor near the front side of the'machine is traveling to the back side, more broke will be constantly added thereto. 7

. The result of the conditions just described is that the total accumulation of broke at the discharge end of amechanical conveyor, such as an endless belt, can reach tremendous proportions on paper machines of the great widths and high speeds now increasingly being used, as

will be evident upon momentary consideration-of the rate at which broke will pile up on a machinewhich is, for example, three hundred inches in width and has a running speed of two thousand or more feet per'minute.

Since this accumulated broke may be in the form of sheet of a consistency ranging upwards from 20%, it is a common occurrence in paper mills that operation of a paper machine must be suspended until such accumulated broke has been manually disposed of to a repulping machine. Furthermore, the problems of broke removal are not limited to large or high speed machines but are in some respects even more troublesome on smaller machines where limitations of space increase the difficulty of installing adequate equipment for handling the broke.

It is a primary object of the present'invention to provide apparatus for conveying broke laterally of a paper machine which is of such construction and operating characteristics that not only can it handle broke successfully on paper machines of an extensive range of sizes and speeds, but it can also at the same time effect a sufilcient degree of repulping of the broke during transfer to the side of the machine to reduce it to a readily fiowable consistency for further removal by a suitable P P Another object of the invention is to provide broke conveying apparatus as outlined above in the form of a conveyor pipe which extends across the machine adjacent a location where broke is likely to accumulate, and which cooperates with a broke removing doctor and water jet mechanism to receive the broke directly from the doctor and to convey it to one or both sides of the machine while continuously mixing it with additional water until it reaches a readily flowable consistency for delivery to a;

machine to deliver the broke to.both side of the machine area Saws e 0 diverge in the direction of flow therethrough and thereby to provide increasing capacity therein for the continu ously added broke material, and a further object is to provide such apparatus wherein the conveyor pipe is tapered in opposite directions from the middle of the in installations 'where the width of the machine is such that the accumulation of broke might be excessive if deliveredcontinuously to one side of the machine.

Still further objects and advantages of the invention will be apparent from the following description, the

accompanying drawings and the appended claims.

In the drawings h Fig. 1 is a diagrammatic view of a portion of a Fourdrinier paper machine incorporating broke conveying apparatus in accordance with the present invention;

Fig. 2 is a partial plan view of the broke conveying apparatus of Fig. 1, with portions broken away in sec tion at different levels; 7

Fig; 3 is an enlarged view taken generally as indicated by the line 3-3 of Fig. 1 with the doctor unit removed;

Figs. 4, 5 and 6 are enlarged fragmentary sections on the lines 4-4, 55 and 6-6 respectively of Fig. 2;

Fig. 7 is an enlarged fragmentary view taken as indicated by the line 77 of Fig. 4 and with portions broken Fig. 8 is a diagrammatic view illustrating the operation of the broke conveyor apparatus of Figs. 1-7;

Fig. 9 is a view similar to Fig. 2 showing a construction adapted for smaller paper machines to deliver the broke material entirely to one side of the machine;

Fig. 10 is a fragmentary section similar to Figs. 4-6 showing another construction in accordance with the invention; and v Fig. 11 is a fragmentary plan view of the construction of Fig. 10.

the forming wire 13 travels.

Referring to the drawings, which illustrate preferred embodiments of the invention, Fig. 1 shows at 10 a frag ment of the section of a Fourdrinier paper machine including the couch roll 11 and guide roll 12' over which The newly formed web 15 is transferred from the wire 13 to the top felt 16 by the suction pickup roll 17 for travel to'the transfer press formed by a suction roll '20 and top press roll 21. At

33. In the event of such a break, the web will tendto.

wind on the" top press roll 25 of the first press section,

since there will no longer be a drawing force on the sheet at the second press section. Fig. 1 accordingly shows the roll 25 provided with a broke removing doctor 1 assembly indicated generally at 35 which is of the con struction disclosed in Corbin et al. application, Serial No. 627,526, filed August 3, 1956 and now Patent No. 2,888,073, issued May 26, 1959 to the same assignee as this application.

\As indicated in more detail in Fig. '4, the doctor 35 includes a plate 40 inclined downwardly away fron the r011 25 and having associated therewith a doctor" blade 41. The plate 46 is perforated, and it has secured to the under side thereof one or more pans 42 adapted to be filled with water for overflow through the perforated plate 40 onto its upper surface to float broke material downwardly from the roll 25. Fig. 1 shows the paper machine as equipped with a valve 44 controlling the water supply to the pan 42 and operated by a photocell 45 to open the valve 44 when a web break occurs, and the photocell 45 is also shown as controlling a valve 46 in the water supply line to a plurality of jet nozzles 47 located above the couch roll 11 for the purpose of slitting the web break to facilitate handling of the resulting broke, all as described in the above Corbin et al.

7 application.

The present invention is directed to the removal from the paper machine of broke delivered to the doctor plate 40 by the doctor blade 41. Referring particularly to Figs. 2 and 3, a conveyor pipe '50 extends across the machine adjacent the lower edge of the doctor plate 40, and this pipe 50 is tapered in opposite directions from a minimum diameter at substantially the center of the machine to a maximum at the two outer edges of the wire. Each of these large ends of the pipe 50 is connected by an elbow 51 or 52 to discharge pipe 53 or 54 which preferably leads to a suitable mechanical pulping apparatus (not shown) for repulping broke material.

The conveyor pipe 50 is provided throughout its length with a slot 55 having lower and upper edges 56 and 57 and located as shown in Figs. 4-6 in the lower quadrant thereof adjacent the roll 25. The lower edge 56 of the slot 55 is connected directly with the lower edge of the doctor plate 40 to receive therefrom the broke material sliding along the surface of plate 40, and the iocation of the slot edge 56 is sufiiciently above the vertical center of pipe 50, as shown, that a trough-like portion of pipe 50 lies below the level of slot edge 56 into which the broke material can fall from plate 40.

A water supply pipe 60 for the conveyor pipe 50 similarly extends the full width of the paper machine above the doctor unit 35 and between the pipe 50 and the roll 25, and the pipes 60 and 50 are connected by a discharge passage 61 formed by upper and lower walls 62 and 63, which extends the full length of the water pipe 60 at an acute angle to the plate 40 and is directed generally tangentially toward the slot 55. The upper wall 62 of the passage 60 is connected directly with the upper edge 57 of the slot 55, and the lower passage wall 63 extends to approximately the same level as the wall 62 so that a space remains remains between the lower end of passage 61 and the surface of plate 40 which is of approximately the same vertical extent as the slot 55 to receive therethrough the broke from plate 40. In addition, the passage 61 is shown as provided with a plurality of directing fins 65 arranged generally diagonally of the direction of web travel, with these fins being inclined from the center of the machine toward the nearer side of the machine in each case in order to direct the water into pipe 50 and towards. opposite sides of the machine from the longitudinal center of pipe 50 in the form of multiple jets.

In use whenever a web break occurs causing broke to accumulate on the roll 25, the doctor unit 35 operates to deliver such broke continuously to plate 40 for downward sliding movement to the slot 55. Simultaneously, water is directed through the passage 61 at a sufficient rate and velocity to disintegrate the relatively soft broke web and to cause it to swirl around the interior surface of the pipe 50 While it is being continuously mixed with additional water. This action is illustrated diagrammatically in Fig. 8, in which the broke web is indicated at and the arrow pattern shows how the mixture of web material and water is caused to swirl in a continuously increasing spiral until it reaches the adjacent large end of the pipe 50 for delivery to the pipe 53 or 54. Preferably, as shown in Figs. 4-6, the passage 61 is also so located that a portion of the water ;jet therefrom will strike the lower edge portion of the plate 40 to blast the broke material therefrom into the slot 55.

The sizes of the pipes 59 and 60 are correlated with the size and speed of the paper machine and the consistency to which it is desired to reduce the broke web on the machine. For example, if the web passing through the press section 25-26 is at consistency and the size and speed of the machine is such that this web isequivalent to 400 gallons per minute of mixed fiber and water, the broke material can be reduced to a flowable 4% consistency if the pipe 60 delivers a total of 1600 gallons of water per minute at sufiicie'nt pressure, for example 60 p.s.i. to maintain a substantially uniform jet stream along the entire length of the passage 61.

The pipe 50 should be of suficient cross section at each location along its length both to accommodate the total volume of water and broke material received therein through the slot 55 and progressing therethrough from the smaller portion thereof, and also to maintain a hol low space of substantial diameter in the center thereof, as indicated at 66 in Figs. 4-6. Under these conditions, since the velocity of the mixed broke and water in feet per minute will be substantially uniform, its angular velocity within the pipe 50 will continuously diminish as measured at the center of the machine and at other points between the center of the machine and at either side thereof, and the resulting continuous decrease in the centrifugal force effective on the mixture will promote the desired flow laterally of the machine. This result is also aided both by the action of the fins 65 in directing the water jet at an angle to the length of the machine and also by the arrangement of pipe 50 as shown in Fig. 3 with its two tapered sections at such an angle to each other that their respective lowest portions slope toward the sides of the machine to provide a gravity component aiding flow of the mixture to the discharge pipes 53 and 54. Thus the tapered construction of pipe 50 aids in the operation of the apparatus while also providing the necessary increasing capacity towards the sides of the ma" chine to accommodate the broke web moving thereto both laterally and longitudinally of the machine.

During normal operation of the paper machine, the broke removing apparatus of the invention is simply standing by, although it may be found desirable to maintain the water supply to the pipe 60 continuously in order to assure that the proper pressure and volume of water will be available when a web break occurs. It is, however, also possible to provide a control valve for the pipe 60 which is opened by operation of the photocell 45 in the same manner as the valves 44 and 46, as is indicated by the valve 70 in Figs. 1 and 3, so that water is supplied to the pipe 60 simultaneously with a web break. In either case, after a break does occur, the apparatus of the invention operates continuously so long as broke is supplied thereto, and each such interval of operation terminates when the machine has been re-threaded.

It will therefore be seen that it is necessary only to design the conveyor pipe 50 and water supply pipe 60 in proper relation with the size and speed of operation of the paper machine in order for the apparatus of the invention to be able to handle the full output of broke of the machine for whatever time interval is required to repair any web break. Not only will this apparatus dispose of the broke material as fast as it is produced, but it initiates the repulping of this material while it is collecting and delivering the material to its discharge pipe, and there is therefore no opportunity for broke to accumulate on or near the machine.

The double taper construction for the pipe 50 as described is especially advantageous on paper machines of great width, since it distributes the broke to both sides of the machine and thus makes it possible to employ discharge pipes of only half the size which would be required if the entire broke mixture were delivered to one side of the machine. However, the principles of the invention are equally applicable to smaller sized machines where the broke accumulates at a correspondingly slower volumetric weight, and for such machines it is possible to employ a conveyor tube having only one discharge end toward which it tapers from a closed end of minimum diameter. Such an arrangement is shown in Fig. 9, in which the conveyor tube 80 has a closed small end 81 at one side of the machine and tapers to maximum diameter at the opposite side of the machine where it connects with an elbow 82 leading to a discharge pipe corresponding to either of the pipes 53 or 54 in Fig. 3. The water supply pipe 85 corresponds to the pipe 60 and is similarly connected with the conveyor pipe 80 by a passage unit indicated generally at 88 and corresponding in construction with the passage 61 as already described. The valve 90 in Fig. 9 similarly corresponds to the valve 70 in Figs. 1 and 3, and the operation of the form of the invention shown in Fig. 9 is therefore essentially the same as that of either half of the embodiment described in connection with Figs. 1-7.

As noted, the invention has definite applicability to small paper machines, and this is particularly the case where the size of the machine is such that space limitations make it more diflioult than on larger machines to incorporate other types of cross machine conveyors for broke. Either the arrangement shown in Figs. 2-8 or the arrangement of Fig. 9 may be used for such installations, and Figs. -11 show a further construction in accordance of the invention which may be adapted to use in any installation where either of the other forms may be used.

In Fig. 10, the roll 25 corresponds to the roll 25 in the other views, andv the conveyor pipe 100 may be of the same construction as the conveyor pipe 50 as already described. In the place of the doctor unit 35, Fig. 10 shows a simple doctor blade 101 mounted at 102 along one edge of an imperforate plate 103 which extends to the lower edge of the slot 105 in the pipe 100 which corresponds to the slot 55 in the pipe 50. The water supply pipe 110 corresponds in function to the water supply pipe 60 in the place of the discharge passage construction at 6165, and the pipe 110 is equipped with a plurality of separate jet discharge nozzles 111 which may be individually of conventional construction.

Referring to Fig. 11, the jet nozzles 111 are mounted along the pipe 110 in fairly closely spaced relation and are inclined in such manner that those on one side of center of the machine are directed toward the adjacent outer edge of the machine while those onthe opposite side of center of the machine are inclined in the opposite direction. For example, these nozzles may be individually approximately 1 inch in diameter and may be set on centers spaced 1.5 inches apart along the pipe 110 across substantially the entire width of the machine, in which event satisfactory results will be obtained with the water supplied at pressures in the range of 250-350 pounds p.s.1.

- The arrangement of the water supply pipe 110 and nozzles 111 may be used with the doctor blade arrangement of Fig. 10 and may also be used in conjunction with the water float doctor assembly 35, and the arrangement with the simple doctor of Fig. 10 is especially advantageous on machines of small size where space is at a premium. It will also be apparent that if the width of machine is such that all the broke may be delivered to one side as shown in Fig. 9, this result can be accomplished with the arrangement of Figs. 10 and 11 by directing all of the nozzles 111 toward the same desired side of the machine.

While the forms of apparatus described herein constitute preferred embodiments of the invention, it is to be understood that the invention is not limited to these precise forms 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. Apparatus for use in a paper machine for removing broke laterally of the machine from a roll, comprising doctor means for effecting delivery longitudinally of the machine of broke accumulating on said roll, a conveyor pipe of substantially cylindrical section extending from side to side of the machine parallel with said roll and adjacent said doctor means, said conveyor pipe having a 1 slot extending lengthwise thereof in position to receive the broke from said doctor means, a water supply pipe extending across the machine above said doctor means, means extending across substantially the entire width of the machine and positioned to deliver water from said water pipe into said conveyor pipe through said slot in a direction and at a sufficient velocity to intercept and cause swirling of the broke around the inner circumference of said conveyor pipe, and a discharge pipe connected with at least one end of said conveyor pipe for carrying away the resulting diluted broke material.

2. Apparatus for use in a paper machine for removing broke laterally of the machine from a roll, comprising doctor means including a plate inclined downwardly away from said roll for effecting delivery longitudinally of the machine of broke accumulating on said roll, a conveyor pipe of substantially cylindrical section extending from side to side of the machine parallel with said roll and adjacent the lower edge of said plate, said conveyor pipe having a slot extending lengthwise thereof with the lower edge thereof connected with said lower edge of said plate to receive the broke from said plate, a water supply pipe extending across the machine above said doctor means, means'extending across substantially the entire width of the machine and positioned to deliver water from said water pipe into said conveyor pipe through said slot in a direction and at a sufficient velocity to intercept and cause swirling of the broke around the inner pipe for carrying away the resulting diluted broke material.

3. Apparatus for use in a paper machine for removing broke laterally of the machine from a roll, comprising doctor means including a plate inclined downwardly away from said roll for effecting delivery longitudinally of the machine of broke accumulating on said roll, a conveyor pipe of substantially cylindrical section extending from side to side of the machine parallel with said roll and adjacent the lower edge of said plate, said conveyor pipe having a slot extending lengthwise thereof in the lower quadrant thereof adjacent said roll, means connecting the lower edge of said slot with said lower edge of said plate to receive the broke from said plate, a water supply pipe extending across the machine above said doctor means, means forming a plurality of jet discharge passages extending along said water pipe across substantially the entire width of the machine in position to deliver water into said conveyor pipe through said slot in a direction and at a sufficient velocity to intercept and cause swirling of the broke around the inner circumference of said conveyor pipe, and a discharge pipe con-' and adjacent said doctor means, said conveyor pipe having a slot extending lengthwise thereof in the lower quadrant thereof adjacent said roll, means connecting the lower edge of said slot with said lower edge of said plate to receive the broke from said plate, a water supply pipe extending across the machine above said doctor means, means forming a plurality of jet discharge passages extending along said water pipe across substantially the entire width of the machine in position to deliver water into said conveyor pipe through said slot in a direction and at a suflicient velocity to intercept and cause swirling of the broke around the inner circumference of said conveyor pipe, and a discharge pipe connected with each end of said conveyor pipe at opposite sides of the paper machine for carrying away the resulting dilutedbroke material.

5. Apparatus for use in a paper machine for removing broke laterally of the machine from a roll, comprising doctor means for effecting delivery longitudinally of the machine of broke accumulating on said roll, a conveyor pipe of substantially cylindrical section extending parallel with said roll and adjacent said doctor means, said conveyor pipe having a slot extending lengthwise thereof with the lower edge thereof connected with said doctor means to receive the broke from said plate, a water supply pipe extending across the machine above said doctor means, means extending across substantially the entire width of the machine and positioned to deliver water from said water pipe into said conveyor pipe through said slot in a direction and at a sufficient velocity to intercept and cause swirling of the broke around the inner circumstance of said conveyor pipe, said conveyor pipe being tapered to diverge towards the side of the machine to receive the increasing volume of the resulting diluted broke material flowing therein towards the side of the machine, and a discharge pipe connected with said conveyor pipe adjacent the side of the machine for carrying away the resulting diluted broke material.

6; Apparatus for use in a paper machine for removing broke laterally of the machine from a roll, comprising doctor means for effecting delivery longitudinally of the machine of broke accumulating on said roll, a conveyor pipe of substantially cylindrical section extending parallel with said roll and adjacent said doctor means, said conveyor pipe having a slot extending lengthwise thereof with the lower edge thereof connected with said doctor means to receive the broke from said plate, a water supply pipe extending across the machine above said doctor means, jet discharge means extending across substantially the entire width of the machine and positioned to deliver water from said water pipe into said conveyor 'pipe through said slot in a direction and at a sufiicient velocity to intercept and cause swirling of the broke around the inner circumference of said conveyor pipe, said conveyor pipe being tapered to diverge towards each side of the machine from a central portion of minimum diameter to end portions of maximum diameter to receive the increasing volume of the resulting diluted broke material fiowing therein towards the side of the machine, and a discharge pipe connected with "each of said end portions of said conveyor pipe adjacent the side of the machine for carrying away the resulting diluted broke material.

7. Apparatus for use in a paper machine for removing broke laterally of the machine from a roll, comprising doctor means for effecting delivery longitudinally of the machine of broke accumulating on said roll, a conveyor pipe of substantially cylindrical section extending parallel with said roll and adjacent said doctor means, said conveyor pipe having a slot extending lengthwise thereof with the lower edge thereof connected with said doctor means to receive the broke from said plate generally tangentially thereof, a water supply pipe extending across the machine above said doctor means, jet discharge means extending across substantially the entire width of the machine and positioned to deliver water from said water pipe substantially tangentially into said conveyor pipe through said slot in a direction and at a sufficient velocity to intercept and cause swirling of the broke around the inner circumference of said conveyor pipe, said conveyor pipe being tapered to diverge from a minimum diameter adjacent one side of the machine to a maximum diameter adjacent the other side of the machine to.receive the in-, creasing volume of the resulting diluted broke material flowing therein towards the side of the machine, and a discharge pipe connected with the larger end of said conveyor pipe for carrying away the resulting diluted broke material.

' 8. Apparatus for use in a paper machine for removing broke laterally of the machine from a roll, comprising doctor means including a plate inclined downwardly away from said roll for effecting delivery longitudinally of the machine of broke accumulating on said roll, a conveyor pipe of substantially cylindrical section extending from side to side of the machine parallel with said roll and adjacent the lower edge of said plate, said conveyor pipe having a slot extending lengthwise thereof in the lower quadrant thereof adjacent said roll, means connecting the lower edge of said slot with said lower edge of said plate to receive the broke from said plate, a water supply pipe extending across the machine above said doctor means, means forming a plurality of jet discharge passages extending along said water pipe across substantially the entire width of the machine in position to deliver water from said water pipe into said conveyor pipe through said slot in a direction and at a sufficient velocity to intercept and cause swirling of the broke around the inner circumference of said conveyor pipe, said conveyor pipe being tapered to diverge towards the side of the machine to receive the increasing volume of the resulting diluted broke material flowing therein towards the side of the machine, and a discharge pipe connected with said conveyor pipe adjacent the side of the machine for carrying away the resulting diluted broke material.

9. Apparatus for use in a paper machine for removing broke laterally of the machine from a roll, comprising doctor means including a plate inclined downwardly away from said roll for effecting delivery longitudinally of t e machine of broke accumulating on said roll, a conveyor pipe of substantially cylindrical section extending from side to side of the machine parallel with said roll and adjacent the lower edge of said plate, said conveyor pipe having a slot extending lengthwise thereof in the lower quadrant thereof adjacent said roll, means connecting the lower edge of said slot with said lower edge of said plate to receive the broke from said plate, a water supply pipe extending across the machine above said doctor means, means forming a plurality of jet discharge passages extending along said water pipe across substantially the entire width of the machine in position to deliver water from said water pipe into said conveyor pipe through said slot in a direction and at a'sufficient velocity to intercept and cause swirling of the broke.

around the inner circumference of said conveyor pipe,

said conveyor pipe being tapered to diverge towards each side of the machine from a central pontion of minimum j diameter to end portions of maximum diameter to receive the increasing volume of the resulting diluted broke material flowing therein towards the side of the machine, and a discharge pipe connected with each of said end portions of said conveyor pipe adjacent the side of the machine for carrying away the resulting diluted broke material.

References Cited in the file of this patent UNITED STATES PATENTS

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