• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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    • 专利摘要:
    The present disclosure relates to a broke system 5 for a paper machine 1. The system comprises a first pulper arrangement 2a for pulping scrap paper from the paper machine, the first pulper arrangement comprising a first broke pulper. The system also comprises a first broke storage 4a connected to the first pulper arrangement and configured for storing the pulp from said first pulper arrangement. The system also comprises a second pulper arrangement 2b, parallel to the first pulper arrangement, for pulping scrap paper from the paper machine, the second pulper arrangement comprising a second broke pulper. The system also comprises a second broke storage 4b connected to the second pulper arrangement and configured for storing the pulp from said second pulper arrangement.
    公开号:SE1651372A1
    申请号:SE1651372
    申请日:2016-10-19
    公开日:2018-02-27
    发明作者:Magnusson Johan；Karlsson Ola
    申请人:Billerudkorsnaes Ab；
    IPC主号:
    专利说明:

    PAPER BROKE SYSTEMTECHNICAL FIELDThe present disclosure relates to a paper broke system for a paper machine.
    BACKGROUNDIn a paper mill, scrap paper from a paper machine is recycled internally asbroke (also called mill broke or paper broke). For instance, produced paperwhich is damaged or otherwise do not fulf1l the quality requirements of thetype of paper produced, is pulped and reused.
    The broke is typically only recycled to the same quality of paper as it isrecycled from. For instance, unbleached broke may not be used to producebleached paper or a bleached paper layer since this would reduce thewhiteness of the end product. Similarly, paper types for packaging foodstuffshould not include pulp from other types of paper which include somechemicals additives.
    Thus, in order to switch from producing one quality of paper in the papermachine to producing another quality of paper, the broke and broke pulp areemptied from the broke system and the system is cleaned before it is used forbroke of the other paper quality. This is a time consuming operation.
    WO 2014/ 023692 discloses a broke system in which broke is processed in atleast one mechanical pulper, after which some of the pulped broke is recycledto a recirculation store. By using two different recirculation stores, separationof consecutive broke qualities may be achieved.
    SUMMARYOften, paper machines produce the same quality of paper for long periods oftime, in which case it does not matter much that the switching from onepaper quality to another takes long time. However, with more specialisedpaper qualities which are produced in relatively small volumes, the switchingtime is more relevant and has a real impact on production cost and capacity.
    It is an objective of the present disclosure to provide an improved brokesystem for reducing the time it takes to switch from producing a first paperquality to producing a second paper quality with a paper machine.
    According to an aspect of the present disclosure, there is provided a brokesystem for a paper machine. The system comprises a first pulperarrangement for pulping scrap paper from the paper machine, the first pulperarrangement comprising a first broke pulper. The system also comprises afirst broke storage connected to the first pulper arrangement and configuredfor storing the pulp from said first pulper arrangement. The system alsocomprises a second pulper arrangement, parallel to the first pulperarrangement, for pulping scrap paper from the paper machine, the secondpulper arrangement comprising a second broke pulper. The system alsocomprises a second broke storage connected to the second pulperarrangement and configured for storing the pulp from said second pulperarrangement.
    According to another aspect of the present disclosure, there is provided amethod of, in a broke system for a paper machine, switching from first brokepulp for production of a first paper quality to second broke pulp forproduction of a second paper quality. The method comprises transportingfirst broke pulp from a first pulper arrangement, comprising a first brokepulper, to a first broke storage. The method also comprises feeding first brokepulp from the first broke storage to the paper machine via a broke line. Themethod also comprises closing a connection between the first broke storageand the broke line. The method also comprises opening a connection betweenthe broke line and a second broke storage. The method also comprisesfeeding second broke pulp from the second broke storage to the papermachine via the broke line. The method also comprises transporting secondbroke pulp from a second pulper arrangement, comprising a second brokepulper, to the second broke storage.
    By means of the first and second pulper arrangements and pulp storagesbeing connected in parallel to each other, the time for switching betweenpaper first and second qualities in the paper machine may be reduced sincethe pulper arrangement need not be cleaned (or may be cleaned while thepaper machine is running, using the other pulper arrangement). Further, thebroke pulp of the first paper quality may not need to be discarded but may bestored in its pulp storage (e.g. called a broke tower) until there is a switchback to the first paper quality in the paper machine. Thus, the paper machinemay alternate between the first and second paper qualities with reduceddown-time during the switching.
    It is to be noted that any feature of any of the aspects may be applied to anyother aspect, wherever appropriate. Likewise, any advantage of any of theaspects may apply to any of the other aspects. Other objectives, features andadvantages of the enclosed embodiments will be apparent from the followingdetailed disclosure, from the attached dependent claims as well as from thedrawings.
    Generally, all terms used in the claims are to be interpreted according to theirordinary meaning in the technical field, unless explicitly defined otherwiseherein. All references to "a/ an/ the element, apparatus, component, means,step, etc." are to be interpreted openly as referring to at least one instance ofthe element, apparatus, component, means, step, etc., unless explicitly statedotherwise. The steps of any method disclosed herein do not have to beperformed in the exact order disclosed, unless explicitly stated. The use of“first”, “second” etc. for different features / components of the presentdisclosure are only intended to distinguish the features/ components fromother similar features/ components and not to impart any order or hierarchyto the features/ components.
    BRIEF DESCRIPTION OF THE DRAWINGSEmbodiments will be described, by way of example, with reference to theaccompanying drawings, in which:Fig 1 is a schematic block diagram of an embodiment of a broke systemassociated with a paper machine, in accordance with the present disclosure.
    Fig 2 is a schematic block diagram of embodiments of a pulper arrangement,in accordance with the present disclosure.
    Fig 3 is a schematic block diagram of embodiments of a broke line, inaccordance with the present disclosure.
    Fig 4 is a schematic flow chart of an embodiment of the method of thepresent disclosure.
    DETAILED DESCRIPTIONEmbodiments will now be described more fully hereinafter with reference tothe accompanying drawings, in which certain embodiments are shown.However, other embodiments in many different forms are possible within thescope of the present disclosure. Rather, the following embodiments areprovided by way of example so that this disclosure will be thorough andcomplete, and will fully convey the scope of the disclosure to those skilled inthe art. Like numbers refer to like elements throughout the description.
    When paper is discussed herein, any type of paper produced in a paper mill isintended, e.g. single-ply paper, multy-ply paper, paper board, cardboard, orany layer therein, etc., having any number of layers, e.g. paper board forpackaging for instance solid or liquid foodstuff. The paper is typicallycellulose based. Similarly, the paper machine discussed herein may produceany type of paper, including board with any number of layer(s). In a multi-layer board, broke pulp is typically used in a middle or bottom layer. Thus, insome embodiments of the present disclosure, the paper machine may be forproducing a multi-layer board.
    When pulp is transported as discussed herein, e.g. from one apparatus toanother apparatus, it may be transported in any way, e.g. via piping by meansof pump(s) or other conveyor means.
    That the first and second pulper arrangements are parallel to each otherimplies that they are functionally parallel, connected in parallel to, not inseries with, each other, not that they are geometrically parallel.
    Figure 1 illustrates an embodiment of the broke system 5 connected to thepaper machine 1. The broke system 5 comprises two parallel recirculationloops for two different qualities of paper broke, each comprising a pulperarrangement 2 and a broke storage 4. A first loop comprises a first pulperarrangement 2a connected to a first broke storage 4a. Similarly, a secondloop comprises a second pulper arrangement 2b connected to a second brokestorage 4b. Both the first and second pulp storages 4a and 4b are connectedto the paper machine 1 via a broke line 6.
    Scrap paper from the paper machine 1 is introduced into the pulperarrangement 2 of the loop currently in use. The scrap paper may e.g. be fromreels of finished paper (e.g. board) which for some reason does not fulfil thequality requirements, or from left over paper from cutting reels and sheets offinished paper to desired sizes before sending it to customers. Additionally,dry or wet (e.g. suspended or dissolved in an aqueous liquid) external paperfibres 3 (herein called external fibres 3a introduced into the first pulperarrangement 2a and external fibres 3b introduced into the second pulperarrangement 2b) may optionally be introduced into the pulper arrangement2. The external fibres may be any fibres which are not recycled directly fromthe paper machine, e.g. slushed pulp, external broke, recycled paper/ boardand/ or dry paper pulp, either from the same paper machine (but from astorage outside of the broke system 5) of from another paper machine. In thepulper arrangement, the scrap paper, as well as any external paper fibres 3, ispulped, e.g. to a solids content of 1-10%, and then transported to the brokestorage 4 of the loop in use, e.g. pumped via piping connecting the pulperarrangement with the broke storage. The broke pulp is stored in the storage4, e.g. a tower, acting as a buffer of pulp for feeding broke pulp to the papermachine. The broke storage 4 is connected to the paper machine via thebroke line 6, via which the broke pulp is transported to feed the papermachine as needed.
    The broke storages 4a and 4b may have any suitable design and volume, anddo not need to be of the same design and/ or volume. In order to act as buffersand, possibly, rather long-time storage for broke pulp, the storage 4 mayconveniently be rather large in volume, depending on the requirements of thepaper machine. In some embodiments, either of the first and second brokestorages 4a and/ or 4b has a storage capacity of at least 1000 m3.
    As an example, the first pulper arrangement 2a and the first broke storage 4ais used for a first paper quality produced by the paper machine, while thesecond pulper arrangement 2b and the second broke storage 4b is used for asecond paper quality produced by the paper machine. When paper of the firstquality is produced by the paper machine 1, broke from the production isintroduced into the first pulper arrangement 2a, where it is pulped to brokepulp. The broke pulp is continuously or batch-wise pumped via piping fromthe first pulper arrangement to the first broke storage 4a. From the firstbroke storage, broke pulp is pumped to the paper machine via the broke line6 as needed for use in the ongoing production of the first quality paper.
    When it is decided to switch the production from paper of the first quality topaper of the second quality, broke pulp from the first storage 4a is no longerpumped to the paper machine. Instead, if the second broke storage 4bcontains broke pulp of the second quality (e.g. from a previous time whenpaper of the second quality was produced by the paper machine), broke pulpfrom the second broke storage 4b is pumped to the paper machine 1 via thebroke line 6. In the mean time, broke of the first paper quality may continueto be introduced into the first pulper arrangement 2a, until there is no moresuch broke to take care of, and broke and broke pulp in the first pulperarrangement may continue to be processed therein and be pumped to thefirst broke storage 4a. Eventually, when the first quality paper has not beenproduced for a while (the paper machine instead producing the secondquality paper), no more broke is introduced into the first pulper arrangement2a and the first pulper arrangement is empty, all the broke being stored in thefirst broke storage 4a for later use when the paper machine switches back andagain starts to produce paper of the first quality.
    While the paper machine produces the second quality paper, the broke therefrom is introduced into the second pulper arrangement 2b, where it is pulpedand the broke pulp is pumped to the second broke storage 4b, in acorresponding way as discussed for the first pulper arrangement and brokestorage.
    Figure 2 illustrates different embodiments of a pulper arrangement 2, e.g. thefirst pulper arrangement 2a or the second pulper arrangement 2b. Each ofthe first and second pulper arrangements 2a and 2b may comprise suitablepiping connecting any number of pulpers for more or less dry or wet brokeand (optionally) external fibres. According to the present disclosure, each ofthe first and second pulper arrangements 2a and 2b comprises at least onebroke pulper 22 for pulping paper broke (scrap paper) from the papermachine 1. In addition to the broke pulper 22, either or both of the first andsecond pulper arrangements 2a and 2b may include additional, e.g.conventional, pulper(s) and/ or other apparatus(es) for producing andprocessing pulp to be stored in the first and second broke storages 4a and 4b,respectively. It should be noted that the first and second pulper arrangementsneed not be symmetrical in what additional apparatuses they include, e.g.depending on what different types of external fibres 3a and 3b are desirablyintroduced into the first and second pulper arrangements, respectively. Thediscussion about a pulper arrangement 2 may relate to either, or none, of thefirst and second pulper arrangements 2a and 2b. Also, further additionalapparatus(es), not mentioned herein (e.g. conventional apparatuses), may beincluded in either of the first and second pulper arrangements 2a and 2b.
    The pulper arrangement 2 comprises a broke pulper 22, as mentioned before,typically for pulping dry paper broke from the production of the papermachine 1. Additionally, the pulper arrangement may e.g. comprise any of:a reel pulper 21, e.g. in cooperation with a finishing department pulper;a machine pulper 23;a bale pulper 24; and/ ora couch pit 25.
    A reel pulper 21 may be used for dry scrap paper (e.g. board). Whole reelsmay first be cleaved in a finishing department pulper. A machine pulper 23may be a pulper along the paper machine 1 for handling scrap paper (e.g.board) e.g. if the paper web breaks. Alternatively, the functionality of eitherof the reel pulper 21 and the machine pulper may be included in the brokepulper 22. A bale pulper 24 may be used for pulping external dry paper pulp.A couch pit 25 may be used for collecting wet broke pulp before it isforwarded to a broke storage 4.
    The different pulpers 21-24 produces pulp which is pumped to, and stored in,the broke storage 4 to which the pulper arrangement 2 is connected.
    Figure 3 illustrates an embodiment of a broke line 6. As discussed above,both the first and second broke storages 4a and 4b may be connected to thesame broke line 6 (alternatively, they may be connected to separate brokelines) for transporting, e.g. by means of pumps and piping or other conveyormeans, broke pulp to the paper machine 1. The broke line 6 may compriseapparatus(es) for working or otherwise handling the broke pulp before it isfed into the paper machine, e.g. into a middle layer of a paper board. In orderto facilitate fast switching between first and second paper quality production,it may be convenient that the amount of broke pulp in the broke line 6 isreduced. For instance, the respective volumes of the apparatuses mayconveniently not exceed what is needed for sufficiently handling the brokepulp. In this way, the broke line may be emptied and cleaned (if necessary)within a shorter time period, allowing the broke pulp from the other brokestorage to be handled in the broke line and be fed to the paper machine.Additionally, during switching from first quality paper broke pulp to secondquality paper broke pulp, the second quality broke pulp may be allowed toenter the broke line 6 upstream of first quality broke pulp still being handledin the broke line. Thus, the second quality broke pulp may be allowed tosequentially enter apparatuses within the broke line 6 as first quality brokepulp leaves said apparatuses, until all first quality broke pulp has left thebroke line and only second quality broke pulp remains and can be fed into thepaper machine. The apparatuses 31-35 illustrated in figure 3 are merelyexamples, and none or only some of them may be used in differentembodiments of the broke line. It should also be noted that the apparatusesmay in some embodiments be arranged in a different order than thatpresented in the figure, and that additional apparatus(es), not shown in thefigure, may also be included in the broke line.
    The broke line 6 may comprise a broke chest 31. The broke chest 31 may bethe starting point of the broke line and may thus be connected with piping toboth the first broke storage 4a and the second broke storage 4b, allowing pulpfrom either of the storages to be transported, e.g. pumped or otherwiseconveyed, from the respective storage to the broke chest. From the brokechest, pulp may be transported to a screener or deflaker 32. From thescreener or deflaker the pulp may be transported to a refiner 33. From therefiner, the pulp may be transported to a mixing chest 34 for mixing separaterefined pulps in desired proportions to bestow desired properties to e.g. aboard layer for which the broke pulp is used. From the mixing chest, the pulpmay be transported to a machine chest 35 which acts as a buffer of the pulpready to be used in the paper machine 1. From the machine chest, the pulpmay be fed to the paper machine 1.
    Thus, in some embodiments of the present disclosure, the broke system 5comprises a broke line 6 connected to both the first broke storage 4a and thesecond broke storage 4b and configured for providing the pulp from said firstand second broke storages to the paper machine 1.
    Figure 4 is a flow chart which illustrates an embodiment of the method of, ina broke system 5 for a paper machine 1, switching from using first broke pulpfor production of a first paper quality to using second broke pulp forproduction of a second paper quality. It should be noted that the steps of themethod do not have to be performed in the same order as herein presented,unless specifically defined or inherently necessary. Further, several of thesteps, e.g. the transporting and feeding steps, may be performed in parallel(concurrently), as is readily understood by a person skilled in the art of papermachinery, based on the present disclosure.
    First broke pulp is transported S1 from a first pulper arrangement 2a,comprising a first broke pulper 22, to a first broke storage 4a. This may beperformed for as long as there is any broke pulp produced by the first pulperarrangement 2a, i.e. possibly also for a while after the switching toproduction of the second paper quality gas occurred.
    First broke pulp is fed S2 from the first broke storage 4a to the papermachine 1 via a broke line 6. The broke storage may act as a buffer for storingthe first broke pulp and feeding it to the paper machine 1 as needed.
    A connection between the first broke storage 4a and the broke line 6 is closedS3. By closing S3 the connection, first broke pulp is no longer able to be fedS2 via the broke line 6. However, first broke pulp already in the broke line 6may continue to be fed into the paper machine for some time till the brokeline 6 is empty of first broke pulp. Alternatively, the first broke pulp in thebroke line 6 when the connection is closed S3 may be recirculated to the firstbroke storage 4a, e.g. if the production of the first paper quality by the papermachine has already been stopped. Another alternative is that the first brokepulp in the broke line 6 when the connection is closed S3 is discarded. Theconnection may be closed S3 by means of e.g. a conventional valve or bydisconnecting the piping between the first broke storage and the broke line.
    After the connection between the first broke storage 4a and the broke line 6has been closed S3, a connection between the broke line 6 and a second brokestorage 4b is opened S4. By opening S4 the connection, second broke pulp isnow able to be fed S5 via the broke line 6 to the paper machine 1. Theconnection may be opened S4 by means of e.g. a conventional valve or byconnecting the piping between the second broke storage 4b and the brokeline 6.
    After the connection between the broke line 6 and the second broke storage4b has been opened S4, second broke pulp is fed S5 from the second brokestorage 4b to the paper machine 1 via the broke line 6. As mentioned herein,in some embodiments, the feeding S5 of second broke pulp comprises11entering second broke pulp into the broke line 6 upstream of first broke pulpstill remaining in the broke line.
    Second broke pulp is transported S6 from a second pulper arrangement 2b,comprising a second broke pulper 22, to the second broke storage 4b. Thistransporting S6 may be started some time after the production of the secondpaper quality has commenced, when scrap paper of produced paper of thesecond quality has been processed by the second pulper arrangement 2b.
    In some embodiments of the present disclosure, the first broke pulpcomprises unbleached pulp. Additionally or alternatively, in someembodiments, the second broke pulp comprises bleached pulp. Thus,bleached and unbleached pulp may be separated by means of embodimentsof the present disclosure, reducing the risk of bleached paper qualities beingcontaminated by unbleached broke pulp, and of unbleached paper qualities,e.g. for foodstuff packaging, being contaminated by bleached broke pulp.
    As mentioned before, in some embodiments of the present disclosure, thefirst and/ or second pulper arrangement 2a and/ or 2b is configured forreceiving external paper fibres 3a and/ or 3b in addition to the scrap paperfrom the paper machine 1. In some embodiments, the external paper fibres3a and/ or 3b include slushed pulp, external broke, recycled paper (e.g.board) and/ or dry paper pulp (e.g. bale pulp).
    In some embodiments of the present disclosure, each of the first and secondbroke storages 4a and 4b has a storage capacity of at least 1000 m3.
    The present disclosure has mainly been described above with reference to afew embodiments. However, as is readily appreciated by a person skilled inthe art, other embodiments than the ones disclosed above are equallypossible within the scope of the present disclosure, as defined by theappended claims.
    权利要求:
    Claims (8)
    [1] 1. A broke system (5) for a paper machine (1), the system comprising: a first pulper arrangement (2a) for pulping scrap paper from the paper machine, the first pulper arrangement comprising a first broke pulper (22); a first broke storage (4a) connected to the first pulper arrangement and configured for storing the pulp from said first pulper arrangement; a second pulper arrangement (2b), parallel to the first pulper arrangement,for pulping scrap paper from the paper machine, the second pulper arrangement comprising a second broke pulper (22); and a second broke storage (4b) connected to the second pulper arrangement and configured for storing the pulp from said second pulper arrangement.
    [2] 2. The system of claim 1, further comprising: a broke line (6) connected to both the first broke storage (4a) and the secondbroke storage (4b) and configured for providing the pulp from said first and second broke storages to the paper machine (1). g.
    [3] The system of any preceding claim, wherein the first and/ or secondpulper arrangement (2a; 2b) is configured for receiving external paper fibres (ga, gb) in addition to the scrap paper from the paper machine (1).
    [4] 4. The system of claim g, wherein the external paper fibres (ga, gb) include slushed pulp, external broke, recycled paper and/ or dry paper pulp.
    [5] 5. The system of any preceding claim, wherein each of the first and second broke storages (4a, 4b) has a storage capacity of at least 1ooo m3.
    [6] 6. A method of, in a broke system (5) for a paper machine (1), switchingfrom first broke pulp for production of a first paper quality to second broke pulp for production of a second paper quality, the method comprising: 13 transporting (S1) first broke pulp from a first pulper arrangement (2a), comprising a first broke pulper (22), to a first broke storage (4a); feeding (S2) first broke pulp from the first broke storage (4a) to the paper machine (1) via a broke line (6);closing (S3) a connection between the first broke storage and the broke line; opening (S4) a connection between the broke line and a second broke storage(4b); feeding (S5) second broke pulp from the second broke storage to the paper machine via the broke line; and transporting (S6) second broke pulp from a second pulper arrangement (2b), comprising a second broke pulper (22), to the second broke storage.
    [7] 7. The method of claim 6, wherein the first broke pulp comprises unbleached pulp, and wherein the second broke pulp comprises bleached pulp.
    [8] 8. The method of claim 6 or 7, wherein the feeding (S5) of second brokepulp comprises entering second broke pulp into the broke line (6) upstream of first broke pulp still remaining in the broke line.
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    同族专利:
    公开号 | 公开日
    SE540023C2|2018-02-27|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1651372A|SE540023C2|2016-10-19|2016-10-19|Paper broke system with parallel pulper arrangements|SE1651372A| SE540023C2|2016-10-19|2016-10-19|Paper broke system with parallel pulper arrangements|
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