US2092821A - Device for continuously beating paper pulp and the like - Google Patents

Description

w. THALER 2,092,821

DEVICE FOR CONTINUOUSLY BEATING PAPER PULP AND THE LIKE Sept. 14, 1937.

Fiied Jan. 18, 1955' 2 Sheets-Sheet 1 Ennentor 'Wilhllm m2 (Ittorneg Sept. 14, 1937. w. THALER 2,092,821

DEVICE FOR CONTINUOUSLY HEATING PAPER PULP AND THE LIKE Filed Jan. 18, 1935 2 Sheets-Sheet 2 .3nnentor WiZheZm/ TfiaZPr (Ittorneg Patented Sept. 14, 1937 PATENT OF 2,092,821 F ICE DEVICE FOR CONTINUOUSLY HEATING PA- BER PULP AN D THE Wilhelm Thaler, Heidenheim-on-the-Brenz, Germany, assignor to American Voith N. Y., a corporation of New Inc., New York, York Application January 18, 1935, Serial No.

Contact 00.

In Germany January 19, 1934 2 Claims.

This invention relates to a beating device for paper pulp and similar .material in which a beater roll works together with a bed-plate. It has for its purpose to create a device which, as compared with the beater of the usual type, works continuously, that means that the pulp to be beaten passes through the machine only once and leaves it without returning to the roll for a second time more often as it happens with the common heaters. With the new device,

the pulp enters in a narrow strip at one end of the roll and leaves in a similar way on the other.

Machines in which the pulp enters at one end of the roll and is transported axially within the casing along the roll are These are in the class of mills, and require further or additional beating devices with roll and bed-plate in which the ad- Y vancement of the pulp along the roll is done by positively operating guide a screw around the roll. satisfactorily only with consistency; at higher consistency, the advancement of the pulp from one end of the roll to the other becomes diflicult.

The further mentioned beating devices with positive advancing guides for the pulp have the disadvantage that the guide and advancing elements, which are arranged in an advancing chamber parallel to the axis, make the whole machinery very complicated and, further, form 'a considerable resistance against the rotation of the pulp. As compared with Jordan-mills, the objects of the invention have the advantage in that a much higher consistency oi. pulp may be worked. In contradistinction to the further known beating devices with guiding chambers and advancing elements, the invention eliminates all devices for the positive guiding of the pulp in the direction parallel to the axis of the roll. In the improved device the advancing devices extend over the whole width of the roll.

means in the form of The Jordan-mills work pulp of relatively low There are no parting walls of any kind, neither regulable flaps nor transportelements, so that the chamber which extends along the -roll and which corresponds to the tub of a normal beater shows a completely free passage from the inlet to the outlet, in which the rotating pulp encounters no resistance whatever so there is no possibility for clogging and curling.

In the accompanying drawings, showing two forms of the present invention by way of examples;

Figure 1 is a top plan view of a pulp beating machine constructed according to the present in vention and with the upper portion of the casing removed.

Figure 2 is a transverse section taken through the same on the line 2-2 of Figure 1.

the usual elements of a heater.

Figure 3 is a similar section line 33 of Figure 1.

Figure 4 is a fragmentary rear side elevation of the mill showing the outlet in section.

Figure 5 is a transverse section taken through a modified form on the line 55 of Figure 6.

Figurev 6 is a top plan view of the modified form.

Figure 7 is a horizontal section taken through the same on the line l-l of Figure 5, and

Figure 8 is a fragmentary transverse section taken through the mill showing a modified form of the inlet for the strip of pulp to be treated.

Beating roll A and bed-plate B correspond to Roll A turns in the direction of the arrow; it throws the pulp over a parting wall C, which corresponds to the back-fall of the usual beater, against a hood D, which leads over to a chamber E arranged in the part or casing E, through which the pulp returns in a backward-downwardly directed stream to the entrance between bed-plate and beatingroll.

At' one end of the beating roll A, the pulp enters as a relatively narrow strip through inlet K and is transported by the roll A over the parting wall C into the chamber E as described.

but taken on the According to the invention, the chamber E has,

on the side of the entrance, an inwardly inclined wall e which displaces the point of the new entrance of the pulp between beating roll and bedplate towards the outlet, this displacement being approximately as great as the size of the entering pulp strip. By size is meant the volume, that is, the height, breadth, and depth of the strip. At the opposite end of the beating roll, the chamber E has a wall e which is approximately parallel to the wall e of the inlet end; its edge e which lies adjacent to the parting wall C leads over to the outlet F for the pulp. The width of the outlet may be approximately the same as that of the inlet. In order, however, to adjust the quantity and the number of convolutions of the pulp passing through the beating points means are arranged, to take off the pulp strip and the outlet in several diiferent widths. For this purpose the outlet may be arranged adjustably in a way that the wall e alone or together with theoutlet channel is regulable in the direction parallel to the axis of the roll.

The operation of the described device is such, that the pulp is transported from the inlet to the outlet in a screw-like line round the roll. By the inclination of the wall e at the inlet end of the roll, the entering strip of pulp is always shifting or advancing that part of the pulp which has made already one round or convolution in the apparatus towards the outlet end of the device. The frequence of passages between beating roll and bed-plate may be regulated by the width of the outlet stream as described. The narrower the pulp strip at the outlet,the greater the number of passages or convolutions of the pulp strip between the inlet and the outlet.

As throughout the entire distance from enwherein the pulp is thrown over the roll. Also to the bed-plate B. For this in this case the pulp travels by itself in a screwline path from inlet to outlet. It is only necessary to give the pulp, after the first passage between roll and'bed-plate, a deflection by an inwardly inclined wall. After a plurality of passages or convolutions, the pulp meets again with an inclined wall at the other end of the roll, by

which it is separated from the chamber beneath the outlet channel and lead to the outlet.

Figures 5 to 8 show as an example of the invention a beating device in which the pulp is thrown over the beating roll.

Beating roll A and bed-plate B are again arranged in a well-known manner. The pulp is thrown over the top of the roll A and guided to the chamber H by the hood G. The said chamber H lies parallel to the axis of the roll, gathers the pulp thrown over the roll and leads it back to the bed-plate B, that is arranged on the other side of the roll. The pulp enters at the one end of the roll A through theinlet J, which may be arranged at the bottom of the chamber H as shown in Figures 5 and 6, or as shown at J in Figure 8. The pulp meets roll. and bed-plate in form of a narrow strip in radial direction and is thrown against the hood G and guided by the same to the entrance of the chamber H where an inwardly inclined guiding. wall e leads it towards the bed-plate. passing laterally by the inlet J and shifting it towards the outlet by approximately the measure of its own width. From here the pulp moves in a screw-line to the outlet at the opposite end. Here a second guiding wall e guides it beneath the outlet F to the end 01' the bed-plate B and the roll A, where it is thrown over the top of the roll into the outlet F.

It is not necessary that the width of the outlet strip be the same asthat of the entering pulp. To regulate the frequence of the passages of pulp over the bed plate B the leaving pulp strip may be altered as to its width. For this purpose the upper part of the guiding wall 0, for instance, may be movable as indicated in Figure '7. The narrower the beating of the pulp strip is chosen, the greater 'is the number of passages between bed-plate and beating roll. The roll A is, in the direction of the chamber H, surrounded by a wall L, which may reach to the neighbourhood of the bed-plate. According to the wear oi the roll-bars, the wall L'is adjustable as shown in Figure 5 towards the roll. The inner wall c of the chamber H may also be adjusted as shown for regulatingthe quantity of pulp, which purpose. ts pp part between inlet J and outlet F may be inclined, so'that the pulp, falling upon it, undergoes a deflection in an axial direction. By means of the described beating device which is most simple in all its parts, a continuous working may be executed which may be used with great advantage together with the uninterrupted proceeding oi the manufacturing of paper, board and the like. There is no danger of clogging with this kihd of device. By using rolls and bed-plates of stone material, as for instance basalt lava, a continuous kneading and frictioning effect may be exerted on pulp with knots which by this operation are completely dissolved.

I claim:---

1. A device for continuously beating paper pulp and the like comprising a casing having an inlet at one end thereof for receiving a strip 01' pulp and, an outlet at the other end for the passage therethrough of the pulp, a beating roll in said casing the axis of rotation of which is substantially perpendicular to the end walls of said casing, a bed plate in said casing cooperating with the beating roll, an abutment within said casing of a length substantially equal to the lengthoi the beating roll, and an undivided compartment within the casing. substantially the length of the beating roll, the end walls of which compartment are substantially parallel with each other and inclined in respect to the axis of the beating roll, portions of the end walls of the compartment' contacting with the end walls of the casing, said compartment having an undivided intake and outlet extending the length thereof, said intake lying adjacent said abutment, said outlet lying adjacent to said bed plate, the pulp: strip entering the casing inlet after its partial convolution around the beating roll and along the inlet end wall of the casing, is given a helical-like path by said strip being deflected by the adjacent inclined wall of the compartment, said helical-like movement of the strip being maintained throughout the length of the compartment to its inclined outlet wall, thersides of said helical-like strip of pulp contacting each other, the body of pulp moving in helical-like strips and filling the length of the compartment between its end walls.

2. A device for continuously beating paper pulp and the like comprising a casing having an inlet at one end thereof for receiving a strip of pulp and an outlet at the. other end for the passage therethrough of the pulp, a beating roll in said casing the axis of rotation of which is substantially perpendicular to the end walls of said casing, an abutment within said casing the length of which is substantially equal to the length of the beating roll for directing the strip of pulp in its movement imparted by the beating roll, an undivided compartment substantially the length of the beating roll the end walls of which are substantially parallel with each other and inclined in respect to portions of said end walls of the compartment being in conta t with the end'walls of the casing, said compartment having an intake and an outlet extending the length of said compartment, the

' intake lying adjacent said abutment and adapted the axis of the beating roll,

whereby

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