DE1922219C - Apparatus for making a multilayer, continuous web of paper stock - Google Patents

Description

55

The invention relates to an apparatus for producing a multilayer, continuous web made of paper or the like with several drivable in the same direction, with horizontal spacing one behind the other arranged Siebzylindem, which jewcils on the top of the cylinder a headbox for Application of a paper stock suspension on the outer circumference of the cylinder and on the underside of the cylinder a substantially revolving in a tangential plane Common felt to take over the one / one damp paper stock slices from the screen cylinders and a couch roll are assigned behind the inlet gap between the felt and the screen cylinder with this one pressure gap traversed by the felt to squeeze out moisture and to firm Connect the newly taken over from the felt Layer forms with the previous layer, and with one stationary within each screen cylinder arranged, connectable to a vacuum source Sauing zone for the formation and drainage of the paper stock layer on the cylinder circumference, which is extends from the application point for the suspension in the direction of the dentine gap.

Such a device is known from the United States patent 1 «81 ^ 14 already known. There the felt runs through a substantially horizontal plane. and the suction zone in the screen cylinder is located is only at the top of the cylinder and ends at a large distance in front of the inlet gap between the felt and the screen cylinder. To absorb the liquid squeezed out by the couch roller, is in the known design a suction box on the underside of the felt immediately in front the pressure gap provided. With this arrangement the moisture is thus drawn off through the felt and the web lying thereon in a disadvantageous manner. Im uhii ^ -. 'I practice the suction box on the over They hmwegweg felt a considerable wear effect out. so that the rotational speed of the Γ il / es and thus the operating speed of the Device is tightly limited

From the 'I SA. Patent 3 111454 a device for producing a single-layer paper web "by means of a suction screen and a couch roll and a felt surrounding the pressure gap between the wire cloth and the couch roll is known, with in the area of the pressure nip A pressure chamber is arranged in the Siebzvlindor and a couch chamber is arranged in the couch roll. Since the felt runs over deien suction chamber at the circumferential speed of the couch roll, the above-mentioned heavy wear of the felt is avoided, so that comparatively high working speeds are possible, especially since the transfer of the moist paper stock layer to the fiiz does not cause any difficulties, but it penetrates in the printing nip Squeezed out liquid through the paper web and the felt into the suction chamber on the underside of the felt. This is particularly disadvantageous when a multi-layer web is to be produced, since then those previously transferred to the felt. already partially dried layers are always penetrated by new liquid.

The invention is based on the object of providing a device for producing a multilayer To train paper web so that at the highest possible production speed an extensive Dehydration of the fibrous material; is reached without that pressed out liquid penetrates again into the fibrous web in the area of the pressure nip.

To achieve this object, the invention is based on the known device mentioned at the beginning and is characterized in that immediately behind the pressure gap between the screen cylinder and the couch roll inside the screen cylinder a suction chamber is provided in and on the screen cylinder for retaining the squeezed out liquid is.

This training ensures that the liquid squeezed out at the nip does not pass through the

W. net

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. . It has been shown. that with cnt- '■ -bender regulation of the suction pressure directly in the pressure gap, the squeezed out liquid can be held back _{in j on the screen cylinder.} ^u, j _a ß (Jaflurch a proper handover ^l! '' _Ba hn of the felt is prevented. It is to be t loing that not only the Schwerkr recorded cylinder mold mn with a total of 12 assembly designated for supplying a Faseraufschwemmung and a total of 14 designated cylinder sieve assembly.

The assembly 12 for feeding the Autschwemmun ", comprises a manifold 16 through which a flow can flow in the transverse direction, one of which is aqueous Paper stock suspension is fed, which then

η üen i-iiz vcrnniue-ri wuu. uaue ·. im to through a P • j "'-, oen that not only gravity and io flows in order to be distributed over the entire length of the ^u ™' ^, * which at high operating speed of the cylinder mold The Ausn

mun.- is dispersed in a chamber 20 and ge is-cfit. in order to then pass a leveling roller 22

e the centrifugal force ichtlielie at high work speed in the sense of a transfer the web have an effect on the felt, but rather that

Jr also through the felt or the already \ orren. Uu. ™ uk. ... - _

f this sebilden paper stock layers with> ₅ flakes can be removed. De hbd Bh t Dk bdn flow of suspension

those 'webs to be lifted off are connected under pressure, a pull-off force is applied to the web. ': - the .sciiwmdigkeu ^(1' hergäbe; IIBR ^ s but can especially at a particularly high A-bJ: _.Γ Π, the device thus simplifying In | Accordingly, even e.ne smooth GiiuKehwal / e without vacuum chamber advertising _(used and. in lv '-. alternatively by a differential pressure uuierMiü / t "•• n D ^; e practice has shown that it is also possible in an • .olJien version. .iHi-jr '. Accordingly, s; ch nii!; Lt device according to the invention allows a more vj'liic! r.: i; e paper web with high speed souic πι; ι a faster drainage and.-ntspre _c ; _1: ■ - ,! Manufacture of high quality. "Μ · -: In an expedient further development, _sk !. Includes a zone in the suction chamber for cleaning _and drying the surface of the screen cylinder be freed from adhering fibrous material and Fh.-s'iukf't before paper st off

; J is applied.

■, the zone is then at an angle

miscnt. um uann um.-lu .-. ^. ^ ...

ren. by the contained in the suspension

~ '' union of the one in the

Flow direction converging nozzle or eiiK. Longs / 24 so regulated, that of the Diisc .ihsiesieKne floating up at a speed b.-away. which is approximately equal to the circumferential speed of the cylinder mold assembly 14 is. Dn: width and position of the nozzle opening 26 can in a known way /..B. with the help of devices 18. 29 and 30 can be set.

The cylinder mold assembly 14 comprises a sieve filter 32. which is mounted on a tube 34 arranged coaxially with it in such a way that it opposes one another the tube came to rotate - the Zv cylinder 32 is covered in a known way with a wire mesh, so that the water contained in the suspension unhindered in the direction of the axis the drum can run out when the cylinder rotates.

The suspension brought about by the nozzle 24 / -j is due to the cylinder 32 immediately adjacent slit-shaped nozzle opening 26 discharged and deposited on the upper part of the cylinder. the Cylinder 32 is rotated in the direction of the heart, and the '' flooding is achieved with an approximately

The zone is then usually a build-up auisc. 1 m * rotating cylinder

! ,, .., assigned to container for squeezed out liquid. 40 fangsgesdnv nd, gk Λs s.l ^^

i Wd i Rh f dn pressure corresponding, ndcη C -hw ndig

corresponding speed in an im

Direction in each case to the above n ... of the Zvliiideis supplied. This one-

\ pale. d> e to

the -I with a wall in the direction of the print-

s; \ - h extends below the suction chamber D Thus lichi

can c'.ie liquid in an advantageous manner after

,! bi'jn are removed from the screen cylinder and at

Do not go through the inside of the screen cylinder secretly at ^^ .. ^^ "...-.- ^,

to be withdrawn. the delivery grind / and the breast whale / c of a long

In an advantageous embodiment, the run Felt used to take up the paper stock layers formed is inclined downwards in the running direction adjust the screen paper machine.

To / ur discharge of the excess water

UiI-In-IiUi. ι. »<- _σ _ to contribute from the swelling and the passage through the individual pressure gap. In this 50 effect of centrifugal forces on the resulting path trap results in s ^; A space-saving arrangement, with or / ... i.not compensate, is the tube 34 on both the self-cylinders are arranged one above the other with a lateral offset. Such a staggered arrangement is in the context of the production of a multiple

or> ». ii> <; ni from / .u ^ icu-niM. ..n ~ ^ _

11er outside with radially outwardly projecting subdivision members 36, which contain several sector-shaped vacuum or suction chambers AB

Order is within the framework of the production of a menr- lonuige r _m u _U , _u .,.

layered paper web, however, delimit from the German 55 C. I) and another chamber E. The see patent specification 215 070 already known. Absaunkai..mern A. B and C are with a

¹ ~ ^u ■ regulated negative pressure is applied to ensure optimal conditions for the drainage of water, the shaping and holding of the on the outer surface of the cylinder

.11 ^ 11 1 (in-ni.n ....... -... w

The invention will be explained in more detail in the following Drawings explained in more detail using an exemplary embodiment. men unu rcMiiam.ii »j> .i u ^. "_

Fig. 1 is a substantially schematic of slightly 32 deposited paper stock layer and for

drew side view of several panoramic papers - the lifting of the layer from the drum to

masehinen and illustrates their guarantee of the invention.

Appropriate training and arrangement as well as the inven- The lifting of the paper or cardboard material

proper procedures. existing layer of the cylinder takes place

Fig. 2 shows in an enlarged, schematically 65 a gap 38. by the cylinder 32 and a

Drawn section from Fig. 1 details endless. Transfer or receiving felt or a

one of the cylinder mold paper machines shown. endless wire or an endless fabric tub

In FIG. 2 one can see that it is delimited by a total of 10. Taking off the paper or

5 * 6

Karlonmaterialskliicht from the cylinder and the bearing blocks 59 are by means of a pin 62 Placing such a layer on previously produced rotatably and can each with the help of a Layers and the production of a connection by means of a motor 64 to be actuated by a pressure medium / wiping the layer to be applied and which is adjusted beforehand, the layers formed via a hinge pin 68 is facilitated by the fact that 5 is articulated to the bearing block 59; Piston pressure applied to a second gap 42 includes rod 66.

is, by a with the underside of the felt 40 in the in Fi g. I illustrated arrangement of each

• iisammenarbcitendc couch roll 44 delimited because it is a paper machine 10 producing a layer. The couch roll 44 is arranged in a Aufiungbehäl- can one from the supplied suspension er 46, since a considerable proportion of the to begotten layer in each case on the upper part of each sieve cylinder, excess water at the gap 42 due to the linder 32 on the respective sieve cylinder. _(The pressure applied here can be removed from the paper web, and this layer can be extracted or squeezed out from the lower ' Strand |; mer D be transferred upward through the screen cylinder 32 to the direction of the felt 40. The couch roll | is pressed through, the chamber D with a 44 ensures that the fibers of the various | Layers adhere to one another, while in each case one of the excess layers present within the screen is applied to a previously created Sc If water is not placed on the layer deposited on the felt 40, and the downwardly running felt strand 40 is kept away and backwards on the couch roll, its direction of movement is only limited to a minimum. The chamber can with £ lcn extent while, the screen cylinder of the loading ■ <a are acted on by the pressure - happens schriebcnen system, which allows a \ the remaining water out of the screen cylinder eight layers comprehensive paper or Kartonma- 32 is pushed out in order to then produce material from one below. As the direction of travel of the TiI- arranged shell 48 to be caught. In addition, with the arrangement described, the washing or rinsing nozzles 50 can only be changed to a minimal extent; from which the layer was lifted so that the service life of the fil / es is extended. and if necessary, can the Chamber is achieved and the operation of the plant therefore mer K in addition to cleaning and drying DIE 30 äw'icn ünicrhroihcn need be. In addition, supply less air; for this purpose one can enable the use of the described Rur.dz. For example, use the air that the suction pump-screen paper machines will provide to achieve an extraordinarily high production speed, except for the vacuum in chambers A to D. Finally, the fact that the various

According to FIG. 1 are eight circular viewing machines for 35 paper machines are offset from one another and Manufacture of paper or cardboard material on a partially overlap, in addition to the fact that the plant only Substructure 52 next to each other, but vertically after a very small floor area claimed, and that staggered above so that the feed box is possible. the strand 40 of the transfer fil / es a certain machine in each case in the running essentially within a single F.bene to machine behind it overlaps: move 40.

In this way it is achieved that the total moisture level of each of the continuously cr-

The layers on the other side of the nozzle opening 26 have only a minimal floor area. The endless felt or the wire screen 40 with during the movement of the layer in relation to its upper strand moves essentially in chambers A to C in such a way that the layer is a single F.plane. at which the layers 45 produced are lifted off the gap 38 in the opposite position to that of the screen cylinders 32. The felt 40 is arranged, in an optimal state, the upper strand of the felt or wire screen 40 has there- is located. The vertical staggering of the rounds'-be 32, which is curved only to a minimal extent, enables the inclined upper strand 40 of the section to open, so that a flawless transfer of felt is ensured quickly from the lower part of each round-boiler different layers, the 50 bes to lift off, whereby the layer in question is arranged in i'mins altogether an endless multilayer material web inverted position on the Fife. so that form. The felt 40, including its back, the sieve side of each layer is directed upwards. Fenden lower strand 41 is driven with the help of a Mo- Because of the inclined arrangement of the upper felt door or a subdivided drive, the strand 40 is available in a space in which a drive roller 54 is connected. With the 55, the collecting container 46 can easily accommodate the sieve cylinders 32 and / or the couch rollers 44 so that they can collect the liquid, which can - not shown - auxiliary drive devices run off the couch rollers 44 or be connected by the lines. According to FIG. I can also be supplied with known devices 55, 56 and 57 that run on the couch rolls. Further, the inclined arrangement of the obe-tensioning, cleaning, etc. of the felt 40 helps provide. The 60 ren felt strand 40 contributes to the fact that this strand is better dewatered under the multilayered endless web of material according to the effect of gravity, FIG. 1 at the left end of the felt or belt 40 while it runs over the couch rolls 44. Since each 58 lifted off the Fitz or ribbon. The layer removed from a cylinder sieve is still moist

Each of the papif (machines 10 includes a volume, and the wire side of each layer is upwards The device for adjusting the amount of pressure applied by couch roll 44 65 while the next layer of pressure applied to it is circumvented, and since the combined layers above the holds pivotable bearing blocks 59 with bearings 60 for couch rollers run, water is also in the support axis of the couch roll in question 44. to a certain extent in each case in the lower of

two adjacent layers pressed into it, so that an optimal connection between the layers is achieved.

Γι rner are the round sieves beyond the column 42 exposed to a negative pressure to ensure that in the round sieves at the columns 42

depressed moisture is removed from these gaps and then released to the trays 48, whereupon the cylinder sieves in the area of the chamber £ rinsed, dried and subjected to other work steps before a new layer from the suspension is deposited on them.

1 sheet of drawings

Claims (4)

Patent claims: 1. Device for producing a multilayer, continuous web of paper stock with several drivable in the same direction, screen cylinders arranged one behind the other with horizontal spacing. those on the top of the cylinder a headbox for applying a suspension of paper stock to the circumference of the cylinder and on the underside of the cylinder a substantially circumferential in a tangential plane common felt to take over the individual moist paper stock layers from the Siebzylindem and a couch roll are assigned, which behind the F. inlet gap between Felt and cylinder with this one pressure nip through which the felt passes / around pressing out Moisture and to firmly bond the layer taken over from the Fi! / To the previous one Make layer. and with e. icr within of each screen cylinder arranged in a stationary manner. Sauczone, which can be connected to a vacuum source, for forming and dewatering the paper stock layer on the cylinder circumference, which extends in the direction of the inlet gap at the point of application for the suspension, characterized in that immediately behind the pressure gap (42) between the screen cylinder (32) and the couch roll (44) inside the screen cylinder a suction chamber (D) is provided to hold back the squeezed out liquid in and on the screen cylinder. 2. Device according to claim 1, characterized in that that the suction chamber (D) has a zone (/;) for cleaning and drying the Surface of the screen cylinder (32) connects. 3. Apparatus according to claim 2, characterized in that the zone (E) is assigned a collecting container (48) for squeezed out liquid. which extends with a wall in the direction of the pressure gap (42) to below the sowing chamber (D) . 4. Apparatus according to claim 1 to 3, characterized in that the for receiving the formed Felt (40) used for paper stock layers inclined downward in the running direction through the individual Druckspaltc (42) passes through. 50