EP4151300A1 - Cascade de rejet - Google Patents

Cascade de rejet Download PDF

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Publication number
EP4151300A1
EP4151300A1 EP22195555.2A EP22195555A EP4151300A1 EP 4151300 A1 EP4151300 A1 EP 4151300A1 EP 22195555 A EP22195555 A EP 22195555A EP 4151300 A1 EP4151300 A1 EP 4151300A1
Authority
EP
European Patent Office
Prior art keywords
circuit
downstream
working
upstream
reject
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22195555.2A
Other languages
German (de)
English (en)
Inventor
Tilman Bauer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BVG Bauer Verfahrenstechnik GmbH
Original Assignee
BVG Bauer Verfahrenstechnik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BVG Bauer Verfahrenstechnik GmbH filed Critical BVG Bauer Verfahrenstechnik GmbH
Publication of EP4151300A1 publication Critical patent/EP4151300A1/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/18—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force
    • D21D5/24—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force in cyclones
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/30—Pretreatment of the paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/78—Controlling or regulating not limited to any particular process or apparatus

Definitions

  • Impurities can be fibers, pigments, chemical agglomerates and/or sand, for example.
  • the inventor has with the "Separator GS" of the German patent application DE 10 2017 109 683 A1 and the “Kidney Loop” of the granted patent EP 2 864 018 B1 already shown how impurities can be reduced.
  • the "Separator GS” is a special working container in which heavy particles, especially solid ones, are separated by centrifugal force Components such as sand are separated and excreted.
  • the "Kidney-Loop” is a filtration in a side stream of the machine circuit to also remove agglomerates.
  • the present invention is based on the technical task of reducing contamination in starch liquors and/or coating colors of the size and film presses, in particular preventing doctor streaks, and increasing the quality of the waste paper without the paper quality being adversely affected. This improves the quality, in particular the strength, of the paper produced.
  • the invention relates to a device for removing impurities with the features of patent claim 1.
  • the device is designed for removing impurities in starch liquors and/or coating colors.
  • the device can be designed with a machine circuit with at least two circuits.
  • the at least two circuits are each designed with a free-flowing material system and at least one working container.
  • the at least two circuits are each designed with at least one separating element and at least one pump.
  • each separating element separates the free-flowing material system into an accepted material and a rejected material. In this way, contamination in starch liquors and/or coating colors of the size and film presses can be reduced in an advantageous manner.
  • each downstream circuit can correspond to the reject material of a respective upstream circuit.
  • the accept from at least one downstream circuit can be returned to at least one of the working containers of the upstream circuits.
  • the inventors have advantageously found a very high degree of purification in a range of around 90%, including a fluctuation range of 5%, can be detected in starch liquors and/or coating colors. This means that impurities in a range of around 90% can be removed from starch liquors and/or coating colors.
  • the quality of the waste paper can be increased without the paper quality being adversely affected. In particular, doctor streaks are prevented and the strength of the paper produced is improved.
  • the circuits can be connected to one another in such a way that the accept from each downstream circuit can be returned to a single working container of an upstream circuit.
  • the accept from the upstream circuit can be fed to a consumer.
  • This arrangement advantageously allows only starch liquors and/or coating colors with a high degree of purification to be supplied to the consumer, in particular to a size/film press.
  • the quality of the waste paper can be increased without the paper quality being adversely affected.
  • it can prevent squeegee streaks and improve the strength of the paper produced.
  • the working containers in the machine circuit can be arranged in parallel and/or in series and/or in a cascade connection.
  • this arrangement of the working containers can determine a very high degree of cleaning in a range of around 90%, including a fluctuation range of 5%, in starch liquors and/or coating colors.
  • a further advantage of this arrangement can be that if a first working container fails, its activity can be compensated for and/or taken over by a second working container, for example arranged in parallel.
  • the working tank of a downstream circuit can be smaller and/or the same as the working tank of the upstream circuit.
  • a working container in the upstream circuit can comprise, for example, 10 m 3 and a working container in a downstream circuit can comprise, for example, 1 m 3 .
  • a very high cleaning efficiency can be achieved even though the sizes of the working containers can correspond to a ratio of 10:1.
  • impurities in a range of around 90% can be removed from starch liquors and/or coating colors.
  • the quality of the waste paper can be increased without the paper quality being adversely affected. In particular, doctor streaks are prevented and the strength of the paper produced is improved.
  • the separating elements can be connected in parallel and/or series and/or in cascade.
  • This arrangement has the advantage that if a first separating element fails, its activity can be compensated for and/or taken over by a second, for example parallel, working container.
  • the inventors have advantageously found in experiments that this arrangement of the working containers can determine a very high degree of cleaning in a range of around 90%, including a fluctuation range of 5%, in starch liquors and/or coating colors.
  • the working containers of a downstream circuit can be arranged downstream of a separating element of an upstream circuit in the machine circuit.
  • This arrangement leads in an advantageous manner to the fact that the sprouting material from the upstream circuit is fed to the downstream circuit, so that impurities in a range of around 90% can be removed from starch liquors and/or coating colors.
  • the quality of the waste paper can be increased without the paper quality being adversely affected. In particular, doctor streaks are prevented and the strength of the paper produced is improved.
  • the separating elements can be arranged downstream of the working containers in the respective circuits.
  • At least some of the separating elements can have reject locks.
  • at least some of the working containers can have reject locks.
  • the reject locks can be used to collect part of the rejected material (reject) for a short time, e.g. in an (intermediate) container, and then be discharged through a canal.
  • this one part of the reject can be passed on to another working container and/or separating element of any circuit.
  • the separating elements and/or working containers can clean the material system particularly effectively.
  • a very high degree of purification in a range of around 90% can be achieved in an advantageous manner.
  • impurities in a range of around 90% can be removed from starch liquors and/or coating colors.
  • the quality of the waste paper can be increased without the paper quality being adversely affected. In particular, doctor streaks are prevented and the strength of the paper produced is improved.
  • the machine cycle can include at least three ejection devices for ejecting the reject.
  • this proportion of sprouted matter can be passed on to another working container and/or separating element of any circuit.
  • the separating elements and/or working containers can clean the material system particularly effectively.
  • a very high degree of purification in a range of around 90% can be achieved in an advantageous manner.
  • impurities in a range of around 90% can be removed from starch liquors and/or coating colors.
  • the quality of the waste paper can be increased without the paper quality being adversely affected. In particular, doctor streaks are prevented and the strength of the paper produced is improved.
  • the working containers can be designed as an agitator container and/or a simple container without built-in components.
  • work tanks can be special work tanks such as a “GS Separator”, which is described in the German patent application DE 10 2017 109 683 A1 is described.
  • the "Separator GS” is a special working container in which heavy particles, especially solid components such as sand, can be separated and separated as rejects by centrifugal force.
  • increased efficiency can be achieved when removing impurities from the material system, in particular starch liquors and/or coating colors.
  • the quality of the waste paper can be increased without the paper quality being adversely affected. In particular, doctor streaks are prevented and the strength of the paper produced is improved.
  • the separating elements can be designed by means of separating criteria and/or filter media to pull off at least a part of the material system, in particular separated solid components, at the top (top area) and/or at the side.
  • this arrangement enables a high separation efficiency to be achieved by successfully separating the reject from the accept from the stock system.
  • impurities can be removed in a range of around 90% in the material system.
  • the quality of the waste paper can be increased without the paper quality being adversely affected.
  • it can prevent squeegee streaks and improve the strength of the paper produced.
  • the working containers can be designed in such a way that at least part of the material system, in particular separated solid components, is collected at the lower ends of the working containers. Alternatively and/or in combination with this, this part of the material system can be forwarded to at least one working container (15, 24) of a downstream circuit.
  • this part of the material system can be such that the material system of each downstream circuit corresponds to the reject material of a respective upstream circuit.
  • the inventors have in experiments advantageously a very high degree of purification in a range around 90%, including a fluctuation range of 5%, in starch liquors and/or coating colors. This means that impurities in a range of around 90% can be removed from starch liquors and/or coating colors. As a result, the quality of the waste paper can be increased without the paper quality being adversely affected. In particular, doctor streaks are prevented and the strength of the paper produced is improved.
  • At least part of the separating elements and/or working containers can comprise a rejectomat, which can collect and/or discharge at least part of the material system, in particular separated solid components, at certain time intervals.
  • this can increase the longevity of the device according to the invention, because clogging and/or overflowing of the separating elements and/or the working container can be prevented, because by means of the reject locks, part of the rejects can be removed, preferably automatically, at certain time intervals for a short time, e.g .in a container, and then discharged into a channel. Alternatively and/or in combination with this, this one part of the reject can be passed on to another working container and/or separating element of any circuit.
  • the separating elements and/or working containers can advantageously clean the material system particularly effectively. In this way, a very high degree of purification in a range of around 90% can be achieved in an advantageous manner.
  • impurities in a range of around 90% can be removed from starch liquors and/or coating colors.
  • the quality of the waste paper can be increased without the paper quality being adversely affected.
  • doctor streaks are prevented and the strength of the paper produced is improved.
  • the invention relates to a system which can contain the device according to the invention.
  • the consumer can be designed as a glue and/or film press and/or coating unit and can be connected to the working tank of the upstream circuit via a return line.
  • the inventors were able to determine in tests a very high degree of cleaning in a range of around 90%, including a fluctuation range of 5%, in starch liquors and/or coating colors. This means that impurities in a range of around 90% can be removed from starch liquors and/or coating colors.
  • These highly purified starch liquors and/or coating colors can be supplied to the consumer, in particular to the size and/or film presses and/or coating units, with the strength being able to be improved in the paper produced and doctor streaks being prevented. This can also increase the quality of the waste paper.
  • At least one working container and/or at least one separating element can each be connected to a channel.
  • the tank can collect at least part of the substance system, in particular separated solid components.
  • the channel can be designed to be able to discharge at least part of the rejects from the machine circuit.
  • the longevity of the system according to the invention can be increased in an advantageous manner, because a load on the individual components of the machine circuit, such as pumps, working containers and/or separating units, due to impurities in the material system can be reduced, because these are collected as rejects in a Frank and/or can be fed to the channel, which can discharge them from the machine circuit.
  • the separating elements and/or working containers can advantageously particularly effectively clean the material system.
  • a very high degree of purification in a range of around 90% can be achieved in an advantageous manner.
  • impurities in a range of around 90% can be removed from starch liquors and/or coating colors.
  • the quality of the waste paper can be increased without the paper quality being adversely affected. In particular, doctor streaks are prevented and the strength of the paper produced is improved.
  • the invention relates to a method for eliminating impurities in starch liquors and/or coating colors by means of the system according to the present invention and/or by means of the device of the present invention.
  • the process consists of several steps.
  • a material system can be obtained from the working tank of an upstream circuit via a return from the consumer.
  • the material system can be processed.
  • the material system can then be separated into an accepted material and a rejected material by means of the separating element of the upstream circuit.
  • the accept from the upstream circuit can then be fed to the consumer.
  • the rejects from the upstream cycle can be passed on to the downstream cycle as a material system of the downstream cycle.
  • Step 2 can separate the reject of the upstream circuit by means of a separating element of the downstream circuit into an accept and a reject of the downstream circuit. Furthermore, in a subsequent step, the accept from the downstream circuit can be fed to the working container of the upstream circuit. The rejects from the downstream circuit can then be discharged.
  • the method can advantageously lead to a very high degree of purification in a range of around 90%, including a fluctuation range of 5%, being able to be achieved in starch liquors and/or coating colors, as the inventors surprisingly found in tests.
  • the quality of the waste paper can be increased without the paper quality being adversely affected. In particular, doctor streaks are prevented and the strength of the paper produced is improved.
  • the derivation can include a further step in which the rejected material, as a material system, can be forwarded to a further downstream circuit.
  • the reject can be discharged.
  • the degree of purification can advantageously be further improved, so that starch liquors and/or coating colors can become impurities.
  • the quality of the waste paper can be further increased without the paper quality being adversely affected.
  • doctor streaks are further prevented and the strength of the produced paper can also be ensured.
  • a machine circuit includes various components, in particular consumers, separating elements, pumps, which are connected to one another by pipes, so that the excess material system can flow away from the consumer and can be fed back to the consumer through the machine circuit.
  • the machine circuit can be subdivided into at least one circuit within the meaning of the invention. At least two circuits are preferred, with each circuit corresponding to a cleaning stage.
  • upstream is understood to mean an arrangement in which a first component in the machine circuit is arranged in front of a second component in the flow direction of the material system, ie the first component is arranged upstream of the second component.
  • downstream is understood to mean the arrangement of the second component in relation to the first component.
  • One cycle can be upstream of another cycle, i.e. a first cleaning stage can be upstream of a second cleaning stage, or the second stage can be downstream of the first.
  • the flowable material system is understood to mean, in particular, starch liquors, coating colors, aqueous suspensions, aqueous dispersions, waste water, fibrous stock suspensions, combinations thereof and the like.
  • the ghosting that occurs after the respective separating element of the current circuit can be understood as the material system of the downstream circuit if it was fed to the downstream circuit.
  • starch liquors and/or coating colors in particular are subsumed as a material system under the term material system.
  • the separating elements or individual separating elements can be selected from a group which includes sieves, in particular perforated or slotted sieves, paper filters, glass fiber mats, ceramics, membranes, fabrics, porous solids such as sintered metal, beds, mats, felts such as Needle felts, as well as pressure filters, vibrating screens, preliminary filters and separating units and combinations thereof.
  • the separating element of a downstream circuit can be smaller and/or finer than the separating element of the upstream circuit.
  • separating means a separating process in the separating elements, with which ingredients of a material system are separated from one another by using different physical and/or chemical properties.
  • separations can take place, for example, on the basis of density, particle size, particle inertia and/or surface wettability.
  • this separation process results in an accept (accept) and a reject (reject), the ingredients of the accept predominantly having the desired properties and the ingredients of the reject predominantly having the undesirable properties of the material system.
  • the rejects from a circuit if they are passed on to a downstream circuit, are considered as a material system of this downstream circuit. Accordingly, this material system of the downstream cycle can in turn be subdivided into an accepted material and a rejected material. Viewed in this way, this can be continued for each downstream cycle.
  • reject devices can be controlled flaps and/or valves with or without a chamber, which open, for example, when the pressure difference in the separating element increases. With the brief opening of the flap or valves, the rejects in particular can be removed from the area of the filter.
  • ejection devices include at least valves, in particular an outlet valve, with which, for example, components of the material system can be ejected from the machine cycle.
  • the ejection device is a Rejectomat.
  • figure 1 shows a flow diagram from the prior art, in which a material system from a working container 1 via the pump 2 and the feed line 3 to a separation unit, such as the filter 4 is passed.
  • the filter 4 separates the material system into an accepted material and a rejected material.
  • the accept is conducted in the accept line 5 to the consumer 6, in particular a size/film press, with the excess of the stock system or accept being conveyed from the consumer 6 directly via a return 7 and/or additionally via a vibrating screen 9 by means of a further accept line 10 is returned to the working container 1.
  • the rejects occurring on the vibrating screen 2 are discarded into a channel 11 via a discharge line.
  • Reject material is continuously withdrawn from the filter 4 via a return line 8 and fed to the vibrating screen 9 .
  • a flow sheet of the invention is shown by way of example.
  • a machine cycle with a first cleaning stage and a second cleaning stage is shown.
  • the first cleaning stage is upstream of the second cleaning stage and the second cleaning stage is downstream of the first cleaning stage.
  • the first cleaning stage is an upstream circuit and the second cleaning stage is a downstream circuit.
  • the first cleaning stage (upstream circuit) includes a working tank 1, a pump 2, the separating unit 4 with an accept line 5.
  • the accept line 5 carries the accept to the consumer 6, which is in particular a size and/or film press.
  • the separating units 4 , 20 , 24 can also have reject locks for discharge into the channel 11 .
  • the possibility of removing the reject from time to time via a reject machine Separating units 4, 20, 29 eject is the possibility of removing the reject from time to time via a reject machine Separating units 4, 20, 29 eject. In this way, the contaminants are constantly removed, which reduces contamination in the machine circuit and establishes a balance of contamination in the machine circuit.
  • the ejection can also take place in a tank, not shown in the figures.
  • the reject separated by the separating element 4 is not as in figure 1 fed to the vibrating screen 9, but cleaned in a second cleaning stage. This results in a reject cascade.
  • the second cleaning stage comprises a downstream working tank 15 , a pump 18 , a downstream separating unit 20 with an accept line 23 which connects the separating unit 20 to the working tank 1 .
  • the accept of the downstream separating unit 20 from the second cleaning stage is fed via the accept return line 23 to the working container 1 of the first cleaning stage.
  • figure 3 1 shows another flow sheet of the invention by way of example.
  • figure 3 shows in particular the reject cascade figure 2 with the two cleaning levels that are in figure 3 has been expanded to include a third cleaning stage.
  • This third cleaning stage is downstream of the first cleaning stage and the second cleaning stage, with the second cleaning stage being upstream of the third.
  • the first cleaning stage precedes the second and third cleaning stage.
  • the second cleaning stage is directly upstream of the third cleaning stage and the third is directly downstream of the second.
  • the third cleaning stage comprises a further downstream working container 24 , a pump 27 , a further downstream separating unit 29 with an accept line 32 which connects the further downstream separating unit 29 to the working container 1 .
  • the accept of the further downstream separating unit 29 from the third cleaning stage is fed to the working container 1 of the first cleaning stage via an accept return line 32 .
  • figure 4 1 shows another flow sheet of the invention by way of example.
  • the construction of the device figure 4 corresponds to the structure in figure 3 , with the difference that the accept from the separating element 29 of the third cleaning stage is also fed via a branch 33 of the accept return line 32 to the working container 15 of the second cleaning stage directly upstream.
  • a branch 33 of the accept return line 32 to the working container 15 of the second cleaning stage directly upstream.
  • the valves 34, 35 in the accepts return line 32 and the branch 33 is the inflow to the working containers 1, 15 regulated, so that the accept from the third cleaning stage is supplied to both and/or optionally only one of the two.
  • FIG 5 An alternative flow scheme of the invention is shown by way of example. After a first reject sluice of the working container 1, 15, 24, the rejected material, e.g. from the working container 1, is passed to a downstream working container, e.g different cleaning stages are attached, which is connected to a working tank of a downstream cleaning stage.
  • a downstream working container e.g different cleaning stages are attached, which is connected to a working tank of a downstream cleaning stage.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
EP22195555.2A 2021-09-20 2022-09-14 Cascade de rejet Pending EP4151300A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021124218.5A DE102021124218A1 (de) 2021-09-20 2021-09-20 Rejektkaskade

Publications (1)

Publication Number Publication Date
EP4151300A1 true EP4151300A1 (fr) 2023-03-22

Family

ID=83898404

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22195555.2A Pending EP4151300A1 (fr) 2021-09-20 2022-09-14 Cascade de rejet

Country Status (2)

Country Link
EP (1) EP4151300A1 (fr)
DE (1) DE102021124218A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69403662T2 (de) * 1993-07-28 1997-11-06 Ahlstrom Machinery Oy Verfahren und apparat zur behandlung von füllstoffe enthaltendem material wie rückgewonnenen fasern
DE10358567A1 (de) * 2003-12-15 2005-09-08 Nordland Papier Gmbh Verfahren und Vorrichtung zur Behandlung eines Faserstoffs
EP2864018B1 (fr) 2012-06-20 2016-03-30 BVG Bauer Verfahrenstechnik GmbH Filtration en dérivation
DE102017109683A1 (de) 2017-05-05 2018-11-08 Bvg Bauer Verfahrenstechnik Gmbh Vorrichtung zur Trennung von Festteilchen aus Suspensionen
CN212128674U (zh) * 2020-04-08 2020-12-11 中山永发纸业有限公司 一种轻量表面施胶的供料装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69403662T2 (de) * 1993-07-28 1997-11-06 Ahlstrom Machinery Oy Verfahren und apparat zur behandlung von füllstoffe enthaltendem material wie rückgewonnenen fasern
DE10358567A1 (de) * 2003-12-15 2005-09-08 Nordland Papier Gmbh Verfahren und Vorrichtung zur Behandlung eines Faserstoffs
EP2864018B1 (fr) 2012-06-20 2016-03-30 BVG Bauer Verfahrenstechnik GmbH Filtration en dérivation
DE102017109683A1 (de) 2017-05-05 2018-11-08 Bvg Bauer Verfahrenstechnik Gmbh Vorrichtung zur Trennung von Festteilchen aus Suspensionen
CN212128674U (zh) * 2020-04-08 2020-12-11 中山永发纸业有限公司 一种轻量表面施胶的供料装置

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DE102021124218A1 (de) 2023-03-23

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