DE160181C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

It is known that the work of the wire table of the Fourdrinier paper machine is very is expensive because the suction cups large power consumption, heavy strainer wear and especially cause great loss of substance. One is forced; expensive devices for partial To recover the material lost on the sieve to at least to reduce the waste of material.

ίο Albeit the work of the cylinder sieve machine a considerably cheaper one, since the suction cups can be dispensed with with the same, so the cylinder mold machine is neither suitable for producing flawless paper nor flawless cardboard generated.

The improvement of the cylinder sieve machine in the direction that the upper sieve of the cylinder is still guided over special guide rollers, probably allows a better cleaning of the Upper sieve, but has the new disadvantages in the wake of that on the lower sieve of the cylinder stretched format and sealing strips unevenly tension the upper sieve, forcing it to form folds, that the couch roll either overloads the sieve, provided that it is only the support point on the wire, or severely impaired drainage and removal of the sheet of paper if the couch roll of a counter roll supporting the wire rests and bites it the old disadvantages of the cylinder machine:

a) uneven material would take on, regardless of all devices in front of the sieve This is due to the fact that there are no cylinders inside the cylinder, which is mounted on the axle and the spokes Devices for uniform waste water suction and flow regulation attached are,

b) wastewater serving to dilute the feed is inside the cylinder mixed with the necessary spray water, creating an abundance of wastewater and thus Loss of substance occurs.

All of these inconveniences are intended to be addressed by the subject matter of the present invention Arrangement of the ladle screen in the drainage trough can be avoided by

a) the guide cylinder of the ladle screen is completely replaced by individual guide rollers or is only supported on rollers on the side, avoiding spokes,

b) in the interior of the ladle screen, devices for regulating the suction and the flow directions of the wastewater are appropriate,

c) the sealing (and format) tapes stored under the scoop sieve through the scoop sieves stored are replaced,

d) the dewatering of the fabric web and removal of the paper web under the couch roll not hindered by a counter-roller supporting the screen, but more effective is, in that the screen covered with fabric by means of two adjustable rollers as desired " against and around the couch roll - which rests on supports - can be stretched, so that the sewage can drip off unhindered,

e) Splash water after the inside of the sieve is completely unnecessary.

Fig. Ι illustrates the replacement of the guide cylinder by individual guide rollers, Fig. 8 the guide cylinder s under

message of axle and spokes stored on rollers p. Are these guide rollers BEZW. The rollers are stored in a special frame and this is arranged in a pendulous manner in the fabric trough, so the use of a shaking device similar to that of the sieve table on Fourdrinier machines is possible, since the elastic connection of the actual sealing tape on the sieve with the fabric box is walled

ίο side vibrations of the sieve permitted.

The replacement of the guide cylinder by individual guide rollers still has a considerable impact Advantage 'that the lower sieve and cylinder rods hindering the uptake of material or -mantle are avoided.

In Fig. 10 it is shown how the sealing of the wire running over guide rollers on the stock box walls can be produced.
This seal is brought about by an elastic strip s made of rubber or the like. Which, on the box wall tightly fitting, is fixed and on the inner longitudinal edge carries a thicker strip χ made of the same or similar material; the latter lies against the usual shaped band ν and thus creates the tight seal in conjunction with the strip ζ .

The smooth surface of the format tape ν running along on the screen avoids friction between the seal and the screen at the same time.

The strips y arranged under the strips ζ prevent the strip χ from sliding sideways, ie from getting between the edge of the sieve and the material box wall.

The format formation takes place (Fig. 12) expediently by endless format belts, which run on the screen without being connected to it, in that they are particularly tensioned and guided by tension roller e on which guide rollers are axially displaceable.

If the tapes are not to pass the couch section, they are continuously diverted around the drainage trough by rollers r (FIG. 8).

If the dewatering machine is to produce handmade paper formats, several endless, format strips connected with horizontal strips, covering the ladle screen as required, led through the trough.

The sieve is at / (Fig. 1) through the spray tube and rotating brush-cleaned and the splash water through the catch tray to any Use collected, i.e. avoiding mixing with the waste water.

The screen tension takes place at d in a known manner, or, as FIG. 11 illustrates, by means of a tension roller, on the bearings of which two pump pistons u which are under common pressure act hydraulically.

The running regulation can be done by tension roller c .

The couch roll α is supported by sub-bearings, but is subject to movable and adjustable loads; the rollers b tensioning the screen against the couch roll are adjustable in a horizontal or inclined direction and can be removed from the couch roll or pressed against it as required. .

Where necessary, the couch roll a is connected to the guide rolls b by chain wheels and chain to form a common run and is provided with ¹ special drive.

3, 4, 5 and 6 show some possible positions of these rollers with respect to one another.

You have it in your hand to control the drainage of the fabric at will without overloading the sieve, without obstructing the drainage of water and the decrease in fabric to complicate.

It is also possible when using the machine for pulp and wood pulp dewatering or to work cloth pegs completely without wet felt by acting on the couch roll a scraper (Fig. 9) or the Couch roller is set up as a format roller.

Finally, within the. Coaster - which in this case perforated Coat with a screen cover or some must have - the use of known suction devices (Fig. 13) possible for further dewatering and promotion of stock removal from the sieve.

The devices within the scooping sieve are arbitrary and can either consist in the application of the known sewage extraction device, or in the adjustable suction device illustrated by FIGS. 1 and 2, which has the purpose aims to distribute the flow of wastewater evenly over the entire width of the sieve.

This adjustable suction device consists of the suction box g, which can be adjusted by adjusting spindles 0 and which is covered with a sieve bottom, so that the suction flow through pipe k is distributed over the entire width of the sieve after the bucket wheel.

The helical stirrers i give the wastewater, if required, a uniform lateral flow even within the sieve.

To make it easier to clean the fabric trough, it is advisable to use tightly closable ones To attach doors to the walls.

To increase production, to produce cardboard or cardboard in webs or multicolored paper can, as Fig. 7 shows, several such drainage

unite mechanically under a receiving felt.

The wastewater is used in the usual way to dilute the incoming substance.

Claims (2)

Patent-to sayings: I. Dewatering device for paper stock and the like., Characterized by an appropriately sealed, endless, revolving sieve guided over guide rollers and the like inside a pulp trough, on which the substance is deposited, while the pulp water from the space delimited by the sieve with the help a height-adjustable suction device (g) is removed. 2. In the dewatering device according to claim 1, a couch roll (α), against which the endless screen is pressed for the purpose of material removal with the aid of tension rolls (b). 1 sheet of drawings.