US2956623A

US2956623A - Process and apparatus for delivering paper stock to a wire mesh pulley belt

Info

Publication number: US2956623A
Application number: US694756A
Authority: US
Inventors: Ikavalko Erkki
Original assignee: Individual
Current assignee: Individual
Priority date: 1957-04-01
Filing date: 1957-11-13
Publication date: 1960-10-18
Anticipated expiration: 1977-10-18

Description

Oct. 18, 1960 IK'AIVALKO 2,956,623

PROCESS AND APPARATUS FOR DELIVERING PAPER STOCK TO A WIRE MESH PULLEY BELT Filed Nov. 13, 1957 2 Sheets-Sheet l FIG. 2

FIG. 3

ALKO 2,956,623 FOR DELIVERING PAPER MESH LT 2 Sheets-Sheet 2 Oct. 18, 1960 K PROCESS AND APPARATUS STOCK TO A WIRE PULLEY BE Filed Nov 13 1957 FIG. 4

FIG.

INVENTOR. ww- WW A WW 7 United PROCESS AND APPARATUS FOR DELIVERING PAPER STUCK TO A WIRE MESH PULLEY BELT Erkki lktivalko, Mannerheimintie 64-B-26, Helsinki, Finland Filed Nov. 13, 1957, Ser. No. 694,756

Claims priority, application Finland Apr. 1, 1957 7 Claims. (Cl. 162-338) The present invention relates to a process and apparatus for manufacturing paper.

It is conventional in the manufacture of paper to discharge the paper stock from the interior of a head box through a discharge slot thereof onto a moving wire mesh belt. The paper stock is retained on the belt at the sides thereof by a pair of longitudinal baffles respectively located at the sides of the belt and determining the width of the web of paper being formed on the belt. The baffles form continuations of side walls of the head box from which the stock issues onto the belt, and at these side walls of the head box as well as at the baffles the paper stock due to frictional engagement with the head box, side walls and baffles tends to move at a slower rate than at the portion of the stock between the opposite side edges thereof, and as a result the stock does not move uniformly throughout its entire width and this phenomenon gives rise to imperfections in the formation of the paper.

It is accordingly an object of the present invention to provide a process and apparatus which will guarantee that the stock at the ends of the slot of the head box moves at the same rate of speed as the stock between the ends of the slot at the head box.

Another object of the present invention is to provide an exceedingly simple structure which will overcome the tendency of the rate of movement of the stock to be retarded at the ends of the slot at the head box.

With the above objects in view the present invention includes a process according to which a fluid such as a suitable liquid is introduced into the head box at the ends of the discharge slot thereof, and this fluid moves out through the ends of the slot in a manner which prevents the stock from being retarded in its movement at the ends of the slot, and in this way the stock moves uniformly across the head box along the entire length of the discharge slot thereof.

Also with the above objects in view, the present invention includes in the side walls of the head box grooves leading to the slot and adapted to receive liquid which flows along the grooves to the slot in order to prevent the stock from being retarded in its movement at the ends of the slot.

The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, Will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings, in which:

Fig. 1 is a fragmentary diagrammatic partly sectional top plan view of part of a paper manufacturing machine, Fig. 1 illustrating the problem which is solved with the process and apparatus of the present invention;

Fig. 2 is a fragmentary longitudinal sectional view of a part of a paper manufacturing machine which is located 2,956,fi23 Patented Oct. 18, 1960 at the junction between the head box and the moving wire mesh belt;

Fig. 3 is a fragmentary sectional top plan view which is diagrammatic in nature and which corresponds to Fig. 1, Fig. 3 showing the manner in which the problem is solved with the structure of the invention;

Fig. 4 is a view showing part of the structure of Fig. 3 on an enlarged scale so as to clearly illustrate the details of the structure of the invention; and

Fig. 5 is a fragmentary sectional view taken along line VV of Fig. 4 in the direction of the arrows.

In Fig. 1 there is shown diagrammatically in a top plan view one of the side baffle plates 1 which extends along the side of the moving wire mesh belt, this baflle plate 1 forming an extension of the side Wall of the head box, this head box side wall being shown in section in Fig. 1, and the stock issues in the direction of the horizontal arrows of Fig. 1 through the slot which is located along the vertical line of Fig. 1 at the junction between the side Wall of the head box and the baffle 1. As the stock moves outwardly from the head box it tends to flow at the ends of the discharge slot in the direction of arrows a toward the battle 1 to engage the latter at the region b and to rebound therefrom in the direction of the arrows c. As a result there is a formation in the web of fiber doc and lumps, and this floc and lumps cause flow disturbances and lack of uniformity in the paper web. These problems are avoided with the process and apparatus of the present invention.

Referring to Figs. 2 and 3 it will be seen that the paper stock is delivered through the diagrammatically illustrated rectifier roll 4 into the interior of the head box which includes the bottom wall 2 as well as a front wall and a pair of side walls, one of these side walls being shown in Figs. 2 and 3 and the front wall curving downwardly toward the bottom end thereof in the manner shown in section in Fig. 2, Fig. 3 indicating the side wall 5. The baffle 1 forms an extension of the side wall 5, and of course another side wall 5 and another baffle 1 are located at the opposite side of the apparatus. The side walls together with the front and bottom walls of the head box form the elongated discharge slot 3 extending across the head box and the bottom end of the front Wall thereof, and through the discharge slot 3 the stock is discharged onto the moving wire mesh belt which moves at its upper run between the pair of baffles 1 to the left, as viewed in Figs. 2 and 3, this wire mesh belt being shown diagrammatically in Fig. 2.

In accordance with the present invention the side Walls 5 of the head box are each formed next to the bottom wall 2 with an elongated groove 14 located in the interior of the head box, extending parallel to the bottom wall 2, and leading to the discharge slot 3. According to the present invention a liquid such as Water at a suitable pressure is introduced into the pair of grooves 14 to flow therealong to the inner surfaces of the baflles 1, and this liquid prevents the stock from moving at a slower rate at the ends of the slot and along the baflles 1, so that in this way the entire stock moves uniformly across the entire width of the wire mesh belt, and the above difficulties are avoided.

As is shown in detail in Figs. 4 and 5 each of the side walls 5 is formed rearwardly of the slot 3 with an opening which is closed by a plug 7. This plug 7 has a flange 6 which engages the exterior surface of the side wall 5, and the plug 7 is formed with a pair of

openings

12 and 13 passing therethrough. It will be noted that the ends of the

openings

12 and 13 at the inner surface of the plug 7 are located nearer to the discharge slot 3 than the ends of the

openings

12 and 13 at the exterior surface of the plug 7, so that the liquid moving through these openings moves toward the discharge slot 3 when reaching the groove 14 which communicates with the

openings

12 and 13 in the manner indicated most clearly in Fig. 4. Thus, the plug 7 forms a part of theside wall and is formed with a groove communicating with the

openings

12 and 13 and forming an. extension of the groove 14. In other words the groove \14 of each side wall extends in part along a portion ofthe plug 7- of the side wall and in part forwardly of the plug 7 to the discharge slot 3. At its end 15 which is mostdistant from the discharge slot 3 each groove 14 is undercut in the manner indicated most clearly in Fig. 4, so that the liquid entering through the opening 13 of, the plug 7 arrives in the groove 14' at the undercut end thereof to flow alongthe groove 14 toward. the slot 3.

A suitable means is provided to fix the plugs 7 on the side Walls 5, respectively, and to simultaneously serve to supply liquid to the openings of the plugs 7. As may be seen from Figs. 4 and 5, as well as Fig. 3, this means takes the form of a conduit 11 having an enlarged hollow end portion provided with an outer flange 9 which is fixed to the wall 5 as by the screws 8. The end portion of the conduit which is provided with the flange 9 also is formed with a suitable groove which receives the annular flange 6 of the plug 7, as indicated in Fig. 4. Between the plug 7 and the smaller tubular part of the conduit 11, the latter is provided with an enlarged hollow end portion 10 carrying the flange 9 and providing a free space which communicates with the outer ends of the

openings

12 and 13. By connecting the conduits 11 to a suitable source of liquid such as water under pressure, this liquid flows into the hollow spaces 10 and from the latter into the

openings

12 and 13 in the directions of the arrows indicated in Fig. 4, so that the liquid then flows to the grooves 14 in order to prevent the flow of stock from being retarded at the ends of the slot as well as at the surfaces of the baffles 1. As is apparent from Fig. 5 the opening 12 is of an elongated rectangular cross section and extends vertically in cross section, and the same is true of the groove v14', and the opening "13 has a-similar cross section.

The results of the invention may be accomplished in other Ways. For example, instead of providing a liquid under pressure which moves along the outer ends of the web to prevent the stock from being retarded in its movement at the outer side edges of the web, separate belt portions may be provided at opposite sides of the apparatus, and these belt portions may be moved at a rate faster than an intermediate belt portion located between the edge belt portions, so that said edge belt portions also will prevent the stock from being retarded in its movement at the side edges of the web.

It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of process and apparatus for manufacturing paper, differing from the types described above.

While the invention has been illustrated and described as embodied in process and apparatus for providing a uniform rate of movement of paper stock, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can by applying current knowledge readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention and, therefore, such adaptations should and are intended to be comprehended within the meaning and range of equivalence of the following claims.

What is claimed asv new and desired. to be secured by Letters. Patentis:

1. In a machine for manufacturing paper, in combination, a head box having front and bottom walls and a pair of opposed side walls, all of said walls cooperating together to define a discharge slot extending across the head box for delivering paper stock from the interior of the head box through said slot onto a moving wire mesh belt, said side walls each being formed at its inner surface in the interior of the head box with an elongated groove leading to the slot in a direction substantially parallel to said bottom wall and each side wall being formed with an opening passing therethrough and communicating with said groove so that when a liquid such as water is introduced into said head box through said openings the liquid will flow along said grooves through said slot to accelerate the movement of paper stock at the ends of the slot in order to maintain the rate of movement of the stock at the ends of the slot the same as the rate of movement of the stock between the ends of the slot.

2. In a machine for manufacturing paper, in combination, a head box having front and bottom walls and a. pair of opposed sidewalls, all'of said walls cooperating together to define a discharge slot extending across the head box for delivering paper stock from the interior of the head box through said slot onto a moving wire mesh belt, said side walls each being formed at its inner surface in the interior of the head box with an elongated groove leading to the slot in a direction substantially parallel to said bottom wall and each side wall being formed with an oblique opening passing therethrough extending in the direction of movement of the paper stock and communicating with said groove so that when a liquid such as Water is introduced into said head box through said openings the liquid will flow along said grooves through said slot to accelerate the movement of paper stock at the ends of the slot in order to maintain the rate of movement of the stock at the ends of the slot the same as the rate of movement of the stock between the ends of the slot, each of said openings having at the inner surface of the side wall in which it is formed'an end located nearer to the slot than the opposite end of each opening at the exterior surface of each side wall so that the liquid flowing through said openings to said grooves moves toward said slot upon reaching said grooves.

3. In a machine for manufacturing paper, in combination, a head box having front and bottom walls and a pair of opposite side walls, all of said walls cooperating together to form, an elongated discharge slot extending across the head box for delivering paper stock from the interior of the head box onto a moving wire mesh belt, each of said side walls being formed with an elongated groove at its interior surface extending substantially parallel to the bottom wall to said slot, and each of said side walls being formed with a pair of openings leading to the groove thereof for delivering to the groove a liquid such as water, the liquid flowing along the groove to accelerate the movement of the stock at the ends of the slot.

4. In a machine for manufacturing paper, in combination, a head box having front and bottom walls and a pair of opposite side walls, all of said walls cooperating together -to form an elongated. discharge slot extending across the head box for delivering paper stock from the interior of the head box onto a moving wire mesh belt, each of said side walls being formed with an elongated groove at its interior surface extending substantially parallel to the bottom wall to said slot, and each of said side walls being formed with a pair of openings leading to the grooves thereof for delivering to the groove a liquid such as water, the liquid flowing along the groove to accelerate the movement of the stock at the ends of the slot, and conduit means connected to the outer side surfaces of said side walls and communicating. with said openings thereof for delivering thereto a liquid such as water.

5. In a machine for manufacturing paper, in combination, a head box having front and bottom walls and a pair of opposite side walls, all of said walls cooperating together to form a discharge slot through which stock is delivered from the interior of the head box onto a moving wire mesh belt, said slot extending across said head box and said side walls each being formed with a groove extending substantially parallel to the bottom wall and leading to the slot in the interior of said box, and each side wall being formed rearwardly of the slot adjacent to the bottom wall with an oblique opening extending in the direction of movement of the paper stock; a pair of plugs respectively located in and filling said openings of said side walls, said plugs respectively having inner surfaces formed with extensions of said grooves, respectively, and each of said plugs being formed with at least one opening passing therethrough and leading to the groove which is formed in part at the inner surface of each plug; and means for retaining said plug on each side wall, said means being hollow and forming part of a conduit means communicating with said opening of said plug for leading a liquid thereto to flow through the opening thereof into the groove which communicates therewith to accelerate the movement of the stock at the end of the slot.

6. In a machine for delivering stock to a moving wire mesh belt in the manufacture of paper, in combination, a head box having front and bottom walls and a pair of opposed side walls, all of said walls cooperating together to form an elongated discharge slot extending across the head box for delivering from the interior thereof paper stock onto a moving wire mesh belt, each of said side Walls being formed in the interior of said box with an elongated groove extending parallel to the bottom wall up to the slot and each groove being undercut at its end distant from the slot, and each of said side walls being formed with an opening passing therethrough and leading to the undercut end of the groove so that a liquid passing through said opening into said groove will accelerate the movement of the stock at the end of the slot where the groove is located.

7. In a machine for manufacturing paper, in combination, a head box having front and bottom walls and a pair of opposite side walls, all of said walls cooperating together to form an elongated discharge slot extending from wall to wall through which paper stock is discharged onto a moving wire mesh belt, each of said side walls being formed with a substantially horizontal groove parallel to the bottom wall and located in the interior of the head box and leading to an end of the slot, and said side walls respectively being formed with a pair of oblique openings passing therethrough in the direction of flow of the paper stock and located at the rear end of said grooves, respectively; a pair of plugs located in and filling said openings of said side walls, respectively, said plugs respectively being formed with grooves which form extensions of said side wall grooves and each plug groove being undercut at its end most distant from said slot, each plug being formed with an opening passing therethrough and communicating with the undercut end of the groove of each plug; and hollow means fixed to the exterior surfaces of said side walls for holding said plugs thereon, said hollow means acting as conduits for directing a liquid or the like to said openings of said plugs to flow through said openings into said grooves and along the latter for accelerating the movement of the paper stock at the ends of the slot so that the stock does not move at a slower rate at the ends of the slot than at the portion of the slot between its ends.

References Cited in the file of this patent UNITED STATES PATENTS 1,909,150 Bell-Irving et al May 16, 1933 2,347,130 Seaborne Apr. 18, 1944 2,756,648 Lee July 31, 1956 2,865,260 Lee Dec. 23, 1958 2,904,461 Washburn et al. Sept. 15, 1959 FOREIGN PATENTS 539,372 Germany Nov. 12, 1931 419,369 Great Britain Nov. 12, 1934