DE1959465A1 - Method and apparatus for producing fibrous leaves - Google Patents

Description

PATENT ADVOCATE DR. HANS-GUNTHER EGGERT, DIPLQMCHEMiKM

5 KDLN-IJNDENTHAL PETER-KINTGEN-STIIASSE 2 1959465

₅ the 26, Nov. 1969 Eg / Stü.

Center Technique de I ^s of the paper industry _a Cartons et Celluloses ₅ Domaine Universitaire de Ce χ No, 175 _S

Grenoble - Gare (France) '

Method and Apparatus for Making Fibrous leaves

L * he present invention relates to a separation device, "that an emptying of the ZentrliJugenbehälters erfölst when in a centrifugal filter, a sheet of fibrous structure, see _e B" paper, which is produced during the formation of the sheet voiu liquid contents.

I: n general "/ you can get under a sieve sent rl" fugs in ι '-c γ J ι ("C <■ tds ^r a7o determined ' , ι i? Ei ^ r>" h "-i ^ir -" j . ³ ,. J * ³ about paper pulp - ji " ¹ » _θ Si ^Q l ^ ^f > ± "iig-ji, xe insoeso. Ν - ι Lafo« - ^ c if ^! ~ "HL'r ve u = in _s fcestelien 1 · · bf oh ^r i < ι ίΊ; $ "ste '=

ir, A "- j - ■; ,.> Ar- ry * r = τ j, · * ^ if 1 J "S" ^

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= Gate directions of the liquid supply in the rotor and for emptying the liquid »

The operation of this known sieve centrifuge leaves split into three parts.

First you fill the rotating rotor with the liquid. einο the fluid against the outer vessel wall of the rotor under centrifugal force ge = is drückt.und thereby forming a wall or layer _like in the Filtrierwandung of the rotor is immersed "

Next, the fibrous suspension is then injected with a nozzle _s which can be attached to a moving device _{5 to} make sickle ⁵ , that the

The suspension on the filter wall is uniformly distributed wlräo The fibrous suspension penetrates the liquid-Ig speed until the filter wall and is deposited regularly on the filter wall afo ₀ The excess liquid is either removed with the help of a suction device or according to "the system of an overflow = cable trifuge eliminated ο '."

PerC ¹ ^ -C per " ¹ Ie necessary amount of .fibrous suspension cn.; ^F * '" cu "> iden If _s the supply is stopped and the ii.'h, Li -" _ _t rotor continuously with the help of a Ab 3Ci = j '"C-t'rt ig _s the liquid inside the flues = Fl.'" "aspirating _RS, entfei ^ä nto Danacü wlra <5er rotor / ~?"h> r ν> Ic Filtrlerwanäufig with ^c: -.v -.- i » ßo formed ¹ ^ . t, f "i ogerio - ■

>. ι ri ". m ä-m? FIlti ⁵ Ie? * -; anäü.ng can öUi ⁰ Qh decrease j L '" n ^ eekels happen _o Das BXs, ivö Ix-mn but

» Tilt & ®ΐ Filt ^ Ierwanäung <λ \ ιΐ '&: ι S'iiie opening ■ Ιο' el is sucked out. whereby the to -

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Pull out a suitable filter wall provided with the leaf is bent while pulling through this opening.

The use of a suction device has certain Disadvantage. The "device for suction across the Sucker increases the space requirements and the costs of the system, and it also makes difficult adjustment necessary.

Whatever kind of precautions are taken, the suction process is mostly accompanied by "splashes of liquid" which damage the sheet and thus have a detrimental effect on the quality of the leaf surface.

The object of the invention is to eliminate this filing. This is done by allowing for emptying no suction device is required. According to the invention the emptying of the liquid is regulated by slowing down the speed of rotation of the rotor, whereby a continuous decrease of the centrifugal force is effected, and becomes full as a result of gravity by suitable paths, the -for 'at the lower part of the | Rotors are provided. The force of gravity acting on the liquid wins compared to the decreasing centrifugal force increasing in importance and causes the outflow of the liquid.

This device does not require a suction device and relieves the user of the worry of starting up and adjusting a suction device. Further characterized liquid splashes are avoided, which could degrade the quality of the fibrous sheet _r

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Continuous deceleration of the rotor gives:

■. .: _Λ the tangential velocity,,, one also lower values / aas solexie, aie aas leaf would change by cutting.

The invention also relates to a pull-out device the fibrous sheet from the rotor of the centrifuge,

The removal of the rotor lid to pull out the blade has proven to be very tedious in practice and because of the progressive locking of the various components often proved impossible without special tools,

The other method, in which the sheet is pulled out of a cover opening by bending the filter wall without removing the cover, has proven to be difficult to carry out with the known sieve centrifuges. In all known screen centrifuges for papermaking, which are built like conventional centrifuges, the bottom of the rotor has the shape of an inverted shell which is attached to the end of the motor shaft. This form makes it difficult to remove the said filtration "wall considerably, forcing the user to ,, to subject the wall large deformations that can damage this _s eliminating the possibility of re-use is no longer given.

To avoid these disadvantages, a method of removing the blade from a sieve centrifuge containing a flat-bottomed rotor has been developed.

The method consists in that a flexible filtering auxiliary carrier, for example a wire mesh, is attached to the inside of the filter wall before the rotor

00 9 826/1 -SU-BAD OFUGiNAL

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H S H Δ. η ι

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is set in rotation, the side edges of this auxiliary carrier pushing out along the surface lines of the filtering turn. A fibrous sheet is then formed on the auxiliary carrier in a known manner. After formation of the sheet and stopping the rotor of this sheet is along one of the generatrices in the vicinity of the check-contacting side edges of the auxiliary carrier auseinandergesehnitten ₀ The sub-carrier with the sheet sum passing the mounted in Deekel the centrifuge opening is rate-sided single bit '. rolled * Then the support and the sheet are pulled out through the opening.

This element allows easy and quick removal of a leaf with the aid of a flexible tray. ^:: ' gort » Ze, aie ForBiveränaerunp: the carrier is not permanent ₅ camouflage: · this can be used again immediately after the sheet has been detached from the surface of the carrier«,

I a slight;! Is the process of 2erschneidens the paper sheet along a "DER Mante .linien Ic to η sugleieh advantageous in Meise dur narrow leads that the originally connected Seitenkaiiten of the auxiliary carrier are separated _t, The temporary change in shape of the auxiliary support preferably consists l Rolling up the carrier around yourself *

• * 5. The invention. Concerns; also slnmi rotor for oils Sieb- ■ ser.trlfuge ^ wit the see the previously mentioned. Procedure by uliPSia los & en, * The Koto: L ^{r of} the STleoeentrifuge according to the invention heel'czt e: lnen flat boaer. _s of at the end of ί- · ϊο1'-ο? /.: ^ ·; · 11ε- attached into Im, Segensatx au ·

j - ": - Ätt # bel'annteii 'HotoT ^ a ^ älo a bottom of aer form of a u' ^ swept?; ·?: ι Selsaie hafcoii ₅ allows crleser Äufbai: ·

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In the bottom of the rotor are expediently between the Filtrierwandung and the outer cylinder wall bores for emptying the rotor after the formation of the blade for the drainage of the liquid contained in the rotor

Furthermore, the outer cylinder wall is covered with an inneria Ring that is turned against the axis of the rotor

- and underlialfo fies rotor base and that at some distance from it is _o Another such ring is near the ■ upper. Cylinder tendrils provided.

During the rotation, the liquid, which is pressed by the centrifugal force against the outer wall of the rotor, is kept at an even thickness by these two rings _s is the formation of the liquid layer of uniform thickness equal to · = DER Außenwandimg to the rotor at ₀ During the emptying determines the decrease of the centrifugal forces äureh aas braking the -Rotors causing the outflow of the liquid over the edge of the lower ring ₀ ·

The width of the upper and lower ring should preferably be equal to the ideal thickness of the desired liquid during the rotation of the rotor. The. ■ Liquid layer, - which forms during egg rotation _s then exhibits an optimal thickness-sur formation of the fibrous

I. ί Λ ί f ι "ie Yc " '"El- Γ ¹ \ ^T Dl ^ - _t ^{3 C} ί 1 3 öxe a ] I. ^ Gx J U ν I il '" f - ti " i property i -j ! LIw 5, öS 'ί j "I . of rs r ? '-ί f _o ew · * ■ "1 ^a i: E ^ C '<OS,'"j act 1 c f " V L

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In the following an embodiment according to the Invention given in consideration of FIGS. 1 to 3.

Fig. 1 shows an axial section through a sieve centrifuge according to the invention.

The Pig. 2a, 2b and 2c show the sieve centrifuge in three different emptying stages for three different rotational speeds of the rotor. Ä

3a and 3c are perspective views of the Sieve centrifuge shown. In one case the grid is fixed inside, in the other it is made from the centrifuge taken out.

Fig. 3b shows a detailed view in which the side edges of the grid straight apart.

A sieve centrifuge like the one in Pig. I is shown, consists of a fixed to a support 2 stator 1 and a rotor, which consists of an outer waterproof sy-. Lindrischen jacket 3 and a Filtrierwandung 4 consists, ( which is attached between «an annular upper partition wall 5 and the flat bottom 6.

The rotor is attached watertight to the end of the shaft 7, which is held with the aid of a bearing 8 known per se. The shaft can be driven by a motor 9 and a drive belt 10 can be set in rotation. A device for coupling and for continuous slowing down, e.g. a braking device by friction is shown schematically in Fig. i by 11 and 12 respectively.

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In addition, the Filtrierwandung 4 is internally _s covered by the grid 13, the fixed between the annular partition walls 14 and 15 is _s which are in turn adjustably mounted on the filtering wall k- "

The waterproof floor is provided with bores 16 _s β ending up between the outer cylinder 3 and the Filtrierwandung H. Below the bottom 6, a ring 17 _s attached to a belt 18 with screws ₉ acts together with the equally wide upper ring 5 _s during the rotation of the rotor to ensure the formation of a liquid layer on the outer cylinder jacket 3 through the centrifugal effect, = this liquid layer has a thickness _s which is between the width of the ring 17 and the ring 5 _s while the excess liquid by centrifugal overflow over the edge of the ring 17 flows ο

The stator i has a bottom 19 ₉ which is provided with an emptying line 20 »■ -

Finally, a nozzle 21 which can be moved in and out in a suitable manner can produce a fibrous suspension, .B ₀ . spray a paper pulp _s evenly onto the grid 13 »

The mode of operation of this embodiment of a sieve centrifuge described above is as follows

The rotor is set in motion and reaches normal rotation speed _e This rotation rate is so great that the web _s speed (peripheral speed), the Filtrierwandung about 600 to i800 m / sec _e.

Now simply fill in a liquid such as water, a _s under the effect of now against the gravitational force be trächtlichen centrifugal force against the cylinder wall 3 0 0 9-8 26 / 1SH

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is pressed and a liquid layer 22 forms, such as is shown in Fig. 2a. Since the centrifugal force is much greater than the gravitational force, is the inner Surface of this liquid layer 22 is cylindrical.

A fibrous suspension, for example paperniasse, is now injected with the aid of the nozzle 21 *. The suspension converts Pt through the river rock. See, In. Oil the grid 13 is immersed, which is applied to the filter wall H , and is deposited on the Gitt.er. The excess water flows over the. Edge of the lower ring VJ and environmentally ä stands also dsη of the upper ring 5 from _o

iii _.!. ■ * ■ 'τ ι f ΐ * "ι ^ _- ¹ ^ i den ■ -separation * ·"<."- * c'" "" -. " ¹ ^ 'ä'G si an ¹ IIs

decreases

L- ^Tj i - it ι '<' - κ ¹ Jl ■ "'*" c ilchp thus di ·.

"ifirY ¹ > 1 1 i. *» ^s ί C ^ ₃ \> ο / f ■ = 4, "■ r ι <les sheet l '" r "b Hiiijcrj' * '-, τ« .it-ΙΟ- >

This emptying-β ?: ¹ does not force any suction devices or events; auri-h simple. Yerlangsaniön the red door speed. When the rotor has come to rest, the mass is eaten up (PIg = 3a) »Miu one separates the" over-liiander- ¹ XlegisMen, 3eltenrancle; e 23 ^s Jü (24, whereby the leaf 25 along eliiev- his mantellirjlc · * :, serrlssen wlr-d (P; lg, - 3g) _o Then-ΐ ·· Ι: Γ · ά the grid X3 slightly rolled around itself; (PIg ₁ 3c ) ₃ ma ^ w ■ from the centrifuge hes'auisnahmeii su can,

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. - ίο -

The sheet 25 is then peeled off from the grid 13 _s which can be covered to re-use in the centrifuge "

This type of emptying and removal with simple devices and as little as possible for the staff. leading hand movements is done by slowing down the The speed of rotation enables and requires neither dismantling nor difficult tricks,

The sieve centrifuge according to the invention allows possible ver = faessemngeh and variants to _s s _o B _o can the grid 13

Zones of different types and sizes have, in order to see leaves with a special structure., S ₀ B ₀ fillgran structure _s '

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Claims (1)

P at ent an s ρ rü ch e 1] Sieve centrifuge for the production of fibrous sheets with a roto located inside a stator, which has a watertight, cylindrical outer vessel, a filter wall concentric therewith and a device for injecting. _Fiber suspensions have ΰ characterized by a device (12) for continuous braking of the rotor ₅ bores (16) in the bottom (6) of the rotor _Γί which are connected to an outlet (20) in the bottom (19) of the stator (i), and rings (5 _s 17) on the outer shell (3) of the rotor, Sieve centrifuge according to claim I _3, characterized in that the rings (5 _S 17) have the same width = 3. Sieve centrifuge nach.'den claims 1 or 2 _S ä characterized by a rotor with a cylindrical cover opening and a flat bottom (6). ■ ^! -. Sieve centrifuge according to Claim 3 _S, characterized by a flexible, filtering, rollable auxiliary support (13). f.-. Sieve centrifuge according to claim 4, characterized in that _s '<5.-v.;' A the auxiliary carrier (13) consists of a wire mesh. 6. Sieve centrifuge according to claim 4 or 5 ₃ , characterized in that the auxiliary carrier (13) has a special structure: -: · was noticed. - 7. A process for the production of fibrous sheets _{s in} particular paper by forming a liquid layer on the inner wall of the rotor of a sieve centrifuge _s injecting a Shb fiber suspension, forming the fiber sheet on the surface of a filter wall and removing the liquid, characterized in that the fiber sheet on a forms a rollable filtering auxiliary carrier and the liquid flows off downwards behind the filter wall as the speed of the rotor decreases 1 ^ J ₉ g ₂ g _{; 1} g _{1 / +} BATH ORIGINAL