DE2208391B2 - Papermaking machine - with broke recirculation circuitby passing machine chest - Google Patents

Abstract

When a malfunction occurs in a papermaking machine, broke can be fed to the stuff box via a route which bypasses the machine chest, the outflow from the latter simultaneously being restricted, so that the machine is kept running on broke stock until the malfunction is corrected. Broke stock overflowing from the stuff box during a malfunction may be recycled direct to the broke blend tank.

Description

The invention relates to a method and an apparatus for producing paper by means of a Paper machine of the usual design and ütiichai additional units.

A typical paper production line consists of a combination of the following elements; Ze-Usioff reservoir, Mixing and Proponionierungsmaschinen, a paper machine, for example a Fourdrinier-Masehine, on which the paper web is formed, dryers, a system for handling the Brown plastic fibers, collection containers for the various Water that is excreted by the raw paper ban and pumps for circulation of the different liquids in different phases of the paper manufacturing plant.

Brown stock is the waste or waste that occurs in any phase of the paper production plant. Committee can be understood. As a rule, paper production systems have brown stock systems, due to the waste generated during paper production or from the finished paper

a "is fed back into the production cycle. Braunsto'ff arises during paper formation in the event of malfunctions in the paper machine, but he is recruited also from the residues resulting from the cutting and trimming of finished paper.

The accumulation of a certain amount of brown matter is inevitable in a paper manufacturing plant; the Mixed material used for paper production usually contains about 10 to 15% brown stock. There this percentage of the usual waste production in a paper machine becomes the total Waste amount, possibly after processing, returned to the plant. The one above Any amount of waste that goes beyond this, however, leads to the following disadvantages:

a) The operating data of the paper machine operated with brown stock differ from those when mixed substances are used;

b) Brown material must have been stored, that is in particular using modern high-speed paper manufacturing equipment a problem. If such a system fails, waste is generated in quantities of 25 tons per hour. Storage of such quantities poses considerable difficulties.

c) Not recycling large amounts of waste is not economical, on the other hand a paper machine loaded with too large amounts of brown stock does not work satisfactorily. This can go so far that only more waste is produced. Furthermore the quality of a product remains far behind if the system works irregularly the return that can be achieved with a properly functioning system.

The invention is based on the object of a To improve the paper production plant of the type explained in terms of their BraunstorTumlaufcs.

This object is achieved according to the invention in that in the event of a web break the machine is operated exclusively or for the most part with brown material.

If a web break occurs in the paper machine in conventional paper production plants, then this machine continues to be loaded with normal material until the fault has been rectified. This substance gets then into the waste cycle. In the method according to the invention, however, is at one

3 4

Web breakage, which can also be intentionally brought about, pump 66 via a pipe 24 into a pressure, For example, to make a repair container 25 is pumped as an overflow container for to be able to feed the normal substance into the dispensing of the desired amount of substance in the machine Paper machine interrupted and then one is formed. Passed through the pipe 24 Substance consisting largely of waste in the 5 the mass in a part 26 of this container, of Machine headed. where by gravity through part 27 of the Starting from a paper manufacturing plant with a container 25 and a pipeline 28 in the paper unit Container for brown plastic fibers, a Gautsch production circuit arrives. Part 26 of the container becomes sump or another container for up- loaded with more material than is necessary, so that in the take a constant pressure from garbage and a pulp or a portion 27 of the container to maintain another container, from which that is appropriately obtained. Too much added mass flows out The processed fibers are conveyed to the paper machine from the container 25 via a pipe 29 and are, the method according to the invention is returned to the stock chest 23. The in the carried out a system with the following features: pipeline 28 located mass enters a

- Means for restricting and / or interrupting 15 pipeline 30, where they are supplied with white water from a chung the promotion of the finished prepared sieve pit 31 is mixed. Through an impeller fibers from the chest of drawers; Pump 32 then becomes it via a pipe 33

- middle! pumped out to the headbox 34 to convey brown stock fibers. This distributes the the brown material mixing container, the Gautsch liquid fiber pulp via a Fourdrinier section 35, cesspool or another container for 20 from where it can be taken up after suitable pressing and drainage of brown stock fibers reaches the papering in a dryer section · 36 and closes there machine; a paper web is formed excess material

- Means for actuating these conveyors in that of the Fourdrinier machine is in a Gautsch manner, that the paper machine is collected in the break pit 40 in the event of a malfunction, which also has the stock on the Paper manufacturing plant essentially takes 25 with a web break in the wet end Braunstofi fibers are kept in operation as the headbox 34 flows out. This is in the can. Gautschbruchgrube 40 collecting material is - an-

It is useful if the means to suit the respective circumstances - via a

change of the brown matter fibers from a pipeline Pipeline 41 to various points of the waste

with an associated pump that transports the 30 systems. Usually part of the

Brown stock bypassing the pulp for paper- wet brown stock via the pipeline 41 to

manage machine system. Thickening pumped out on a brown plastic sieve and

In the drawing, an example serving as an outlet is then stored in a material storage chest 42,

embodiment of the invention shown schematically. From this the substance is generated via a pipeline 43

First, however, based on this drawing, a 35 is pumped into a Braunstcff storage container 44,

conventional plant for the production of paper

purifies. Brown plastic sieve is usually too small to

The drawing represents a plant for the production of the entire amount to be handled, which in the Gautschbruch-

of paper including a Fourdrinier pit 40. Hence it becomes part of the fabric

Paper machine. This usually processes a 40 via the pipeline 41 into a pipeline 50,

Substance consisting of (/) 90% of a story from 75% then into a pipe 51 and thus directly into the

fresh wood pulp and 25% unbleached sulphite brown plastic storage container 44 are pumped. The pump

material and (/ 7) from 10% waste material. pen of the excess brown matter can be applied to this

According to the drawing, suitable wood pulp is made using valves on the various pipe connections.

processed and passed into a wood pulp vat 11. 45 branches are made. As a minor modification of the

From here it is through a pipe 12 into a last-mentioned system, the wet brown

Proportioning and measuring container 20 is pumped. Material passed by the container 44 and from the

Treated sulfite material is in a sulfite material pipeline 50 in a pipe 52 and from there

bucket 13 headed. From this it is pumped directly into the brown matter mixing container 15 through a pipe

line 14 in the proportioning and measuring container 50 are.

20 pumped. All paper fibers that are produced as scrap, when brown stock is suitably processed, is, for example, the protruding edge in the dry part

stored in a brown material mixing container 15, from the paper machine or at a railway station he via a pipe 16 in the proportional break in the dryer section occurring reject, nierungs- and measuring container 20 is pumped. In 55, the latter are used in a dryer section hollander 45 is the proportion of brown matter that collects. The stuff from this Dutchman is in Wood pulp and sulphite substance are determined so that they can be processed appropriately and via a pipe Mixture of substances in a mixed pulp tiing 46 in the waste material storage container 44.

21 is forwarded. The mixed substance comes out of pumps.

this vat via a pipeline 22 into a material 60 If the brown material storage container 44 is filled

Bucket 23. Accordingly, with the material bucket 23, excess waste does not go into the sewer

duct chutes for fresh material and brown material, a tion derived, but sometimes via a pipe

Proportioning and measuring container and a line 54 are pumped into the wood pulp vat 11 and

mixed material chute in connection. The latter does not have to affect the properties of the wood pulp,

absolutely in all plants for the production of pa- 65 This is undoubtedly undesirable, but some-

pier of the type shown in the drawing was previously unavoidable.

be at hand. For loading the proportioning and measuring

From the pulp box 23, the substance is from a container 20, the brown material from the brown

44 *

16 again _icder added dte pipeline in the _Belrieb "" -er-

it is beneficial during paper manufacture that

SuB to interrupt the brown substance in the ^ ^"ma ^ J ^ s, even if the Hersellun ^ kr" s_ run not work well on a ^ of the web tore example is -. Not ^P paper manufacturing plant abgertelU - ^we et top enau. one. rather relies on it, that the couch break pit and the brownstock system imported into the machine fabric 1 ™ ^andha ^. ⁿ · _{represents schematically.} the usual Protung carried During * _f in the drawing ^ ™ ^ATIS ° "circuit made of stock consistency, the processing of the ignition material as well as others in paper manufacture. «Bh measures. These are not shown in the drawing

15th

In the paper-making plant according to the invention, the problem of the production and storage of excess waste is solved by a Konr Sting 60 and, in the case of some machines, by a pipeline 61. In the event of another malfunction in the ^{? A} P ^{, the mixed material supply from} _n ^de ^ ™ _dr 23 is throttled or completely interrupted in the papermaking plant according to the invention, while the imported material consists entirely or slightly of brown material. The great ..T ⁰ / ^ ^{1 the} ^ measure can be seen in the fact ^that _q ^^ ^en _k ^d _ei ^ _ne 7 _he repair time of the paper production plant is not a new one

ΤΪΓ3Α jt

° ^e ™. required quantities in a very short time in the pipeline 28 and to the impeller _{pump in ^ ^ on} ^ _{wdse ej} ne sufficient

_{has accumulated overflow} , the pump 63 provided in the supply * is switched off. _{Alb who} ^ ¹ f _eng minutes the Rohrle.tung

_{Closing the} valve 62 closed. The J ^ _{1n DnickbehäUcr} 25 overflowing fuel gets _nU nMore back to the previously described kind in

_the chest of drawers 23.. _

_ψ ^ . ^ _{it untef evaluation of the er} ^ ^^ _{of fnschstoff and} BS ^ _{n waste material almost} instantaneously pumping processes and valve controls

-piermaschme mjt ^ _{R leUu en 60 and 61 so} " _te " not to the a ₅ ^^ ^ ^ of the plant in

, _{can be resolved} When under ζ ^ _{ξ, however, the längcr} than 8 to 10 minutes

persist, the system according to the invention offers _considerable advantages.
h * ^ _{must def ph}

_VO n the system according to the invention not during _duration ^ _interruption ßraunstoff dg ■ ^ ^^ ^. ^ _{The ß}

_Tc t, _egg ner lengthy interruption. The He _"fin-making is not limited during ^ _Ur t _terbrec hung 100," 0 ^ ^ brown stock in circulation to JJG -. ^ Hr a ^^^

the

From this material is produced by a pump 63 η the pipes 60 and 24 gfP ^ P ¹ '^^ ^ ^ ^ a point in the paper production, in the direction of flow of the material, seen behind the chute 23. As a result, if part of the system fails, brown material can be deposited on the stot

23, and this ™ B ^ ⁿ "f * ^ portionierungs containers 11 and 13 and measuring container 20 and the nierungs- d" stock chest 21 to be bypassed. The paper machine connected to this plant can therefore be operated ultimately or for the most part with brown material. _SR

In AuSallen the Pa _P ierfertigungsan ^ _g e of the invention are the following measures> ^ y ^ei fen: The valve 62 in the conduit 29 w, rd ^ o set that the current from the pressure vessel 25 J ^ fabric over the pipe 61THE the Bram material mixing container 15 is derived \ Gtectaeiög, the pump 63 is set in Betneb, ^^ n «material from the mixing container 15 via the pipeline

Pump 60 into pipeline 24 and into ^. ^ J ** ^ 25. As soon as there is a sufficient amount of the substance flowing out of the pressure vessel, the container 25 Ut shown in the drawing is introduced . "- ^ SS * fi ^! ^

a. "

J ^^ _{show no} en-

run up. In such cases, the pipe _{and the pipe would be 61 ge} .

_Mäss ^ _{invention is not} required.

^ _{Det zdchnung} scheme of arrival _shown ^ ^ 3 _{version beispi} el. Example 50 wdse could in a modified cycle you _{p the Stof {from the} Gautschbruchgrube out

ν _{through an alternative} . _Ro hrleitung "

PP, _pipeline 24 promote to the pressure

₂₅ ^. ^^ _{AbrfB der Pap bahn} ^ _spei ^ _{so] chen} ^^ _{kannn {e dje} R ₀₁₁₁₁ ^

Sauce area of the cloth chute pump 66 en £ | _{Via the pipeline} 24 into the _container . _{In the} event of a break in the path, d, ^ could then be exercised _{in a very simple manner}

JJ _8 _after ^^^^ _the disturbance - goodbye

_{we switched off again} , where d it P ^ ^^ _{Ά & Gautschrumpe ώ}

^ _{n darste} llt.

_6th Furthermore, the pipeline 65 can be laid differently _{as material from the} ßraunstoi

J ^ ^ _{118 42} gelanj into pipeline 24 The pipeline 65 can also be laid like this

that through them material from the Gautschbruchgrube or the vat 42 to a point of the paper production plant seen in the direction of flow before the suction area of the impeller pump 32, the substance in the paper machine 35 of the plant promotes. In a modified aluminum guide, the pipeline 65 but also serve to straighten fabric to a point in the plant viewed in the direction of flow to be transported in front of the outflow opening of the headbox 34, in all of these embodiments can the illustrated paper machine plant with a substantial proportion of brown stock and a relatively low proportion of fresh material are operated.

The consistency of the brown stock should be checked. In addition, it could prove to be beneficial as well prove to monitor the degree of grinding of the brown matter. This could be achieved through Addition of certain white water, which increases or decreases the degree of grinding. Also through admixture of another pulp in the waste material or by completely different means would be this measure to reach.

The invention described here provides the necessary information to any person skilled in the art on how he can most benefit this invention when disrupting the production of quality paper can adapt to its respective manufacturing conditions by temporary renewed A large percentage of brown stock circulated from the paper mill to the paper mill machine.

1 sheet of drawings

Claims (8)

2 208 39! Claim ;;: J. Process for the manufacture of paper by means of a paper machine of conventional design and conventional additional units, characterized that in the event of a web break the machine only or else is mostly operated with brown material. 2. Paper manufacturing plant for performing the method according to claim 1 with a container for brown plastic fibers, a rubber pit or another container to receive it of rubbish and a rubbish bin or other container from which the in suitable Way processed fibers are conveyed into the paper machine, characterized by the following features: - Means to restrict and / or interrupt the promotion of the prepared Fibers from the pulp chest (23); • - Means for the promotion of brown material fibers from the brown matter mixing container (15), the Gautsch break pit (40) or another Containers for holding brown stock fibers in the paper machine (35); • - Means for actuating this conveyor in such a way. That the paper machine (35) at Malfunctions in the paper production plant mainly with brown stock fibers in operation could have been held. 3. Plant according to claim 2, characterized in that the means for promoting the brown material fibers from a pipe! ag (60) with an associated pump (63), which the Pass brown stock to the paper machine, bypassing the stock chest (23). 4. Plant according to claim 3, characterized in that the paper machine plant Brown stock fibers are fed directly from the Gautsch break pit (40). 5. Plant according to claim 3, characterized in that the pipeline (60) the brown plastic fibers be supplied from any point of the brown material circulation. 6. Plant according to claim 3, characterized in that the flow direction of the substance seen behind the pulp chest (23), the mouth of the pipeline (60) seen in the direction of flow in front of the suction area of the pump (32) which conveys the stock to the paper machine. 7. Plant according to claim 3, characterized in that seen in the direction of flow of the substance The mouth of the pipeline (60) located behind the pulp chest (23) in the direction of flow of the The substance lies in front of the outlet of a pressure vessel (25) of the paper machine. 8. Installation according to one of the preceding claims, characterized in that the pressure vessel (25) is provided with an overflow for excess material, which is provided with means (61, 62) be connected directly to the brown plastic container (15) by bypassing the pulp chest (23) can.