EP2484516B1 - Vorrichtung zur Herstellung von Wellpappe und Kondensatrückgewinnungsverfahren - Google Patents

Vorrichtung zur Herstellung von Wellpappe und Kondensatrückgewinnungsverfahren Download PDF

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Publication number
EP2484516B1
EP2484516B1 EP20120425018 EP12425018A EP2484516B1 EP 2484516 B1 EP2484516 B1 EP 2484516B1 EP 20120425018 EP20120425018 EP 20120425018 EP 12425018 A EP12425018 A EP 12425018A EP 2484516 B1 EP2484516 B1 EP 2484516B1
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EP
European Patent Office
Prior art keywords
condensate
heated plates
steam
group
heated
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EP20120425018
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English (en)
French (fr)
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EP2484516A1 (de
Inventor
Mauro Adami
Lorenzo Vannucchi
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Fosber SpA
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Fosber SpA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/20—Corrugating; Corrugating combined with laminating to other layers
    • B31F1/24—Making webs in which the channel of each corrugation is transverse to the web feed
    • B31F1/26—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions
    • B31F1/28—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions combined with uniting the corrugated webs to flat webs ; Making double-faced corrugated cardboard
    • B31F1/2845—Details, e.g. provisions for drying, moistening, pressing
    • B31F1/285—Heating or drying equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/20—Corrugating; Corrugating combined with laminating to other layers
    • B31F1/24—Making webs in which the channel of each corrugation is transverse to the web feed
    • B31F1/26—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions
    • B31F1/28—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions combined with uniting the corrugated webs to flat webs ; Making double-faced corrugated cardboard
    • B31F1/2845—Details, e.g. provisions for drying, moistening, pressing
    • B31F1/2877—Pressing means for bringing facer sheet and corrugated webs into contact or keeping them in contact, e.g. rolls, belts

Definitions

  • the present invention relates to improvements to systems, machinery and devices for producing corrugated board. More in particular, the present invention relates to improvements to the devices, usually called "double facers", for coupling smooth and corrugated paper sheets to form a corrugated board.
  • the corrugated board is usually formed by a plurality of paper sheets glued together, of which at least two are smooth and at least one is corrugated.
  • the corrugated paper sheet is arranged between two smooth paper sheets, and the sheets are bonded by gluing.
  • the simplest structure of the corrugated board can provide for three sheets as described above, but it can be also produced with more corrugated sheets, i.e. constituted by a greater number of corrugated paper sheets coupled with smooth paper sheets.
  • the corrugated board comprises two outer smooth paper sheets, usually called liners, between which one or more corrugated paper sheets are arranged with the interposition of one smooth paper sheet between two consecutive corrugated paper sheets.
  • Cardboard is produced as follows. Two smooth paper sheets are fed in a so-called corrugating machine. One of these sheets is corrugated forming waves by passing through a corrugating nip formed between two corrugating rollers. A glue is applied on the crests formed by the corrugating rollers and a smooth paper sheet is bonded to the corrugated paper sheet thus obtained, by pressing and heating. In this way, a semi-finished product is obtained at the exit of the corrugator, constituted by two paper sheets, one smooth and one corrugated, glued together.
  • a corrugator of this type is described for example in EP-A-1362691 .
  • One or more composite sheets constituted by one smooth paper sheet and one corrugated paper sheet bonded together in a corrugator, are fed into a so-called double-facer together with a further smooth paper sheet, and the double-facer glues together the semi-finished products.
  • US 2004/0261950 describes an example of a double-facer.
  • These devices substantially comprise a corrugated cardboard feed path extending along a series of sequentially arranged heated plates defining a sliding surface for the corrugated cardboard.
  • Pressing means are arranged above the heated plates to press the paper sheets forming the corrugated cardboard against the sliding surface defined by the heated plates.
  • a flexible drawing member can be interposed between the pressing means and the paper sheets. In some known devices it is vice versa provided for directly pressing with the pressing members on the corrugated cardboard without interposing a flexible member.
  • the device comprises a relatively high number of sequentially arranged plates along the machine direction, i.e. along the feed direction of the sheets forming the corrugated cardboard. Upstream of the heated plates gluing units are arranged, applying glue on the crests of the corrugated paper sheets fed into the bonding device.
  • Gluing occurs through the combined effect of heating the paper sheets stacked together and pressing them against the heated plates below by means of the pressing members.
  • the pressure exerted by the pressing members cannot be hard, as in this case the corrugated paper sheet flutes would be squashed with irreparable damage to the finished product.
  • For gluing it is therefore necessary to apply a limited pressure, maintaining it for a relatively long time.
  • a high number of plates, arranged one after the other along the feed path of the paper sheets forming the corrugated cardboard, is thus required so that pressure and temperature are maintained for a sufficient time to set and dry the glue. Pressure and temperature are applied for a time depending upon the length of the sliding surface defined by the heated plates divided by the feed speed of the paper sheet.
  • the plates are usually heated by means of pressurized and preferably overheated steam coming from a steam generator, a boiler for instance.
  • the steam heats the plates and they transfer heat to the paper sheets advancing along the sliding surface defined by the heated plates, between said surface and the pressing members. Following the heat transferred to the paper sheets, the steam condensates and the resulting water must be extracted from the heated plates and fed back into the steam generator in a closed circuit.
  • the heated plates are usually divided into several different groups; the steam is fed into each group at a pressure different from one group to the other, so as to obtain different temperatures in the different groups of heated plate.
  • This allows to modulate the temperature profile along the corrugated cardboard feed path.
  • the temperature profile can change according to the type of material to be produced; in particular it can change for example according to the number of bonded paper sheets, to the paper sheet grammage, the applied glue quantity, and/or other parameters.
  • the glue is usually water-based.
  • the glue must penetrate inside the cellulose fibers, of which the paper sheets to be glued are made, when it has still enough water content. Once the glue has been penetrated into the cellulose fibers, it is necessary to remove the water so that the glue dries. If the glue is heated too quickly, i.e. if the temperature in the heated plates further upstream along the cardboard feed path is too high, then the water evaporates before the glue is sufficiently penetrated inside the cellulose fibers.
  • water is usually heated at lower temperatures in the first portion of the feed path along the surface formed by the heated plates, so as to condition the paper, i.e. to heat the cellulose fibers before achieving a sufficient temperature for drying the glue.
  • the temperature increases to completely dry the glue, which has had enough time to penetrate inside the cellulose fibers.
  • the steam pressure generated by the steam generator is usually in the order of 15-20 bar. Starting form this maximum pressure value, steam flows at lower pressures are generated by means of adequate regulating valves and are fed into the different groups of heated plates.
  • WO-A-98/47699 discloses a method and apparatus for processing paperboard, including a double-facer and a system for generating a steam film between an advancing cardboard or paperboard web and the sliding surface formed by the heating plates.
  • EP-A-0949065 discloses a further double-facer for manufacturing a web of corrugated cardboard.
  • Figure 1 schematically shows a so-called double-facer according to the prior art.
  • the device is generically indicated with number 1.
  • Number 3 indicates the single heated plates defining a sliding surface for the corrugated cardboard being formed, obtained by gluing webs of semi-finished material.
  • three webs of semi-finished material, indicated with N1, N2, and N3, are fed into the device 1.
  • the web material N3 can be formed for instance by one smooth paper sheet, while the webs N1 and N2 are formed by a smooth paper sheet and a corrugated paper sheet bonded together in respective corrugating machines, so-called single facers, arranged upstream of the device 1 and not shown.
  • a flexible drawing member 7 extends between the pressing members 5 and the webs N1, N2, and N3; this member draws the corrugated cardboard being formed to make it slide against the sliding surface formed by the heated plates 3.
  • the continuous flexible member 7 can be omitted, and the webs N1, N2 and N3 are drawn by means of roller transferring means or other systems.
  • the heated plates 3 are divided into several groups in a known manner.
  • Figure 1 shows only a portion of the device 1, which can comprise an even very high number of heated plates 3 arranged one following the other along the cardboard feed direction F.
  • two groups of heated plates are shown, indicated with 9A and 9B.
  • the first group 9A comprises four heated plates 3, while the second group 9B comprises six heated plates 3. It should be understood that the number of groups and the number of heated plates 3 in each group can change according to the configuration of the device 1.
  • FIG. 1 shows two pressure regulating valves 13A and 13B, feeding the steam coming from the steam supply line 11 into the groups 9A and 9B of heated plates 3.
  • 15A and 15B indicate two conveying ducts that transfer the steam from the regulating valves 13A and 13B to respective steam collectors 17A and 17B associated with the groups 9A and 9B of heated plates 3.
  • the pressure of the steam fed into the two collectors 17A and 17B can be set by means of the pressure regulating valves 13A and 13B, so as to have, if necessary, different steam pressures in the two groups 9A and 9B of heated plates 3.
  • the steam is fed from the collectors 17A and 17B into the single heated plates 3 of the groups 9A and 9B through ducts 19A, 19B.
  • Each plate is connected through ducts 22A, 22B with a condensate collector, indicated with 21A for the group 9A and with 21B for the group 9B.
  • each condensate collector 21A, 21B of each group 9A, 9B ..., into which the heated plates 3 are subdivided is connected with a respective condensate storage tank, indicated with 23A for the group 9A and with 23B for the group 9B.
  • An intercepting condensate relief valve, indicated with 25A for the group 9A and with 25 B for the group 9B, is arranged along the duct connecting each condensate collector 21A, 21B with the respective condensate storage tank 23A, 23B .
  • the condensate storage tanks 23A, 23B are connected with a condensate recovery line 29 through respective ducts 27A, 27B. From this condensate recovery line 29 the condensate is fed back into the steam generator.
  • An intercepting valve indicated with 31 A for the group 9A and with 3 1 B for the group 9B of heated plates 3, is arranged on each duct 27A, 27B .
  • Each condensate storage tank 23A, 23B is connected to the steam supply line 11 through a steam feed line, indicated with 33A for the group 9A and 33B for the group 9B.
  • an intercepting valve is arranged, indicated with 35A for the group 9A and with 35B for the group 9B of heated plates 3.
  • each plate group 9A, 9B ... The condensate forming in each plate group 9A, 9B ... is collected in the respective condensate collector 21A, 21B and discharged into the respective condensate storage tank 23A, 23B passing through the generally open valve 25A, 25B.
  • the valve 31A, 31B of each condensate storage tank 23A, 23B is usually closed.
  • the valve 35A, 35B, connecting each condensate storage tank 23A, 23B with the steam supply line 11, is closed.
  • the condensate heating and recovery system described above, characterizing the known plants and devices, is particularly complex.
  • the object of the invention is to provide a device of the above described type allowing to obtain an efficient condensate collection by means of a simpler and more economical system.
  • the invention advantageously provides for a device (so-called double facer) for producing corrugated cardboard, comprising: a feed path for the corrugated cardboard; along the feed path, a series of sequentially arranged heated plates defining a sliding surface for said corrugated cardboard, said series of heated plates being subdivided into a plurality of groups of heated plates; pressing members to press said corrugated cardboard against the sliding surface; a heating steam circuit for heating the heated plates.
  • the circuit characteristically comprises: a pressurized steam supply line from a steam generator. Furthermore, for each group of heated plates, a pressure regulating valve is provided between said steam supply line and the heated plates of the respective group of heated plates, to supply said heated plates with steam under regulated pressure.
  • a condensate relief valve is provided, connecting the heated plates of the respective group with a common condensate collecting line.
  • the condensate coming from the groups of heated plates accumulates in a condensate storage tank.
  • the storage tank is in turn advantageously connected with a condensate recovery line toward the steam generator.
  • the condensate storage tank can be formed by the same common condensate collecting line.
  • This common condensate collecting line can be formed for instance by a tube with a sufficient diameter to form a condensate storage inner space.
  • the tube can be advantageously inclined so that the condensate accumulates at one end of the tube; otherwise it can be formed by more portions inclined towards condensate converging and storage areas.
  • the storage tank can be simply produced with a tube portion descending from the tube forming the common condensate collecting line, for instance a tube segment perpendicularly connected with the main body of a common tube collecting the condensate from the various groups of heated plates.
  • the storage tank can be constituted by a component separate from the common condensate collecting line and in fluid connection with it.
  • a device for producing corrugated cardboard comprising: a feed path for corrugated cardboard; along said feed path, a series of sequentially arranged heated plates defining a sliding surface for said corrugated cardboard, said series of heated plates being subdivided into a plurality of groups of heated plates; pressing members to press said corrugated cardboard against said sliding surface; a heating steam circuit for heating said heated plates; wherein said circuit comprises:
  • a device it is possible to eliminate most of tubes, valves and control systems usually required in this type of plants, thus reducing dimensions, production and operation costs as well as maintenance.
  • condensate storage tank can be constituted only by a simple tube with adequate diameter, for which the law does not require periodical inspections. This would entail further simplifications and reduction in device production and operation costs.
  • a steam collector is provided connected between the respective pressure regulating valve and the heated plates of the respective group.
  • a condensate collector is furthermore provided, connected between the heated plates of the respective group and the condensate relief valve.
  • a common steam and condensate collector is vice versa provided, connected between the steam supply line and the heated plates of the respective group of heated plates and between the heated plates and the common condensate collecting line, the respective condensate relief valve being arranged between each steam and condensate collector and said common condensate collecting line.
  • a common steam and condensate collector can be used also in a traditional device, where each group of heated plates has one condensate storage tank.
  • each group of heated plates has one condensate storage tank.
  • the advantages of using a common condensate collecting line and a single condensate storage tank get lost, but the advantage is maintained of simplifying the steam supply and condensate recovery system of a single group of heated plates.
  • the invention also relates to a device for producing corrugated cardboard, comprising: a feed path for the corrugated cardboard; along the feed path, a series of sequentially arranged heated plates defining a sliding surface for said corrugated cardboard; pressing members to press said corrugated board against said sliding surface; a heating steam circuit for heating said heated plates; wherein said circuit comprises: a pressurized steam supply line; for at least one group of heated plates, a steam and condensate collector, connected between the steam supply line and the heated plates of the respective group of heated plates and between the heated plates and a condensate collecting and relief system.
  • the device comprises more groups of heated plates and more collectors, one for each group of plates. A relief valve for each collector discharges the condensate toward a collecting system.
  • the steam and condensate collector comprises a tubular volume connected with each heated plate of the respective group of heated plates through a respective steam discharge connection and a respective condensate collecting connection.
  • Each of the condensate collecting connections can advantageously form a siphon between the respective heated plate and the respective steam and condensate collector.
  • the device comprises a control system for opening and closing the condensate relief valves, controlling the selective opening and closing of said condensate relief valves to discharge the condensate selectively from each of said groups of heated plates towards said common condensate collecting line.
  • the control system is designed to open the condensate relief valves sequentially.
  • the condensate relief valves are opened sequentially starting from the condensate relief valve of the group of heated plates under minimum pressure until the condensate relief valve of the group of heated plates under maximum pressure.
  • different sequences can be used, for example random sequences, or according to the succession with which the plate groups are physically arranged along the cardboard feed path, for example starting from the utmost downstream group until the upward group.
  • the pressure can increase from the first group (i.e. the most downstream group) to the last group (the most upstream group) of the sequence.
  • this does not necessarily occur and depends upon the chosen pressure (and therefore temperature) profile.
  • sequence can be not fixed but depending on the condensate quantity accumulated in each collector.
  • Condensate relief can occur for instance through an atmospheric discharge duct. In other embodiments relief can occur towards a group of heated plates by opening the respective condensate relief valve, for example towards the group of heated plates with the minimum pressure.
  • the condensate storage tank for discharging condensate from the storage tank and send it towards the steam generator, is connected with the pressurized steam supply line through an insertion valve for inserting pressurized steam into said condensate storage tank and thus eject condensate from said condensate storage tank.
  • a backflow valve is arranged between the condensate storage tank and the condensate recovery line from the condensate storage tank towards the steam generator.
  • a level detector is associated, connected with a control system for controlling the condensate discharge from said storage tank.
  • the control system advantageously detects the condensate quantity discharged from each group of heated plates and modifies the opening times of the condensate relief valves of the various groups of heated plates according to the condensate quantity accumulated in the time unit.
  • the condensate can be discharged from the storage tank by injecting steam into the tank directly from the steam supply line.
  • the condensate can be discharged from the storage tank towards the steam generator by using the steam at reduced pressure in one of the groups of heated plates.
  • a pressure transducer can be provided on the condensate recovery line.
  • a control system controls the opening of one of the condensate relief valves of a group of heated plates inside which the pressure is higher than the pressure in the condensate recovery line, to discharge condensate from said condensate storage tank towards said recovery line.
  • the condensate is discharged from the storage tank by opening the condensate relief valve from the group of plates where there is the lowest steam pressure.
  • the condensate relief valve from the collector associated with the group of plates with highest pressure is maintained open until the condensate has been completely discharged and it is maintained open so that the pressurized steam flows from the heated plates into the common condensate collecting line and from this into the storage tank.
  • This steam coming from the heated plates pushes the condensate from the storage tank towards the recovery line to the steam generator. In this way neither a separate line to feed pressurized steam into the condensate storage tank is necessary nor a specific intercepting valve on this line.
  • the invention relates to a method for recovering condensate in a device for producing corrugated cardboard comprising: a feed path for the corrugated cardboard; along said feed path, a series of sequentially arranged heated plates defining a sliding surface for said corrugated cardboard, said series of heated plates being subdivided into a plurality of groups of heated plates; pressing members to press said corrugated cardboard against said sliding surface; a heating steam circuit for heating said heated plates.
  • the method of the invention is defined in claim 18.
  • the condensate of each group of heated plates is selectively discharged through a common condensate collecting line into a condensate storage tank, and is then ejected from said condensate storage tank towards a condensate recovery line by insertion in said condensate storage tank at a higher pressure than the pressure in said condensate recovery line.
  • the method according to the invention comprises the steps of
  • the method can advantageously comprise the steps of sequentially discharging condensate from at least some of said groups of heated plates starting from the group of heated plates inside which there is steam under the lowest pressure until the group of heated plates inside which there is steam under the highest pressure.
  • Figure 2 schematically shows a portion of a device 101 according to the invention.
  • the device 101 receives a plurality of webs of semi-finished material, indicated again with N1, N2, and N3, that can be constituted by smooth paper and corrugated paper sheets as described with reference to figure 1 .
  • the device 101 comprises a plurality of sequentially arranged heated plates 103 along the feed direction of the corrugated cardboard formed by the webs N1, N2 and N3 according to the arrow F.
  • pressing members 105 are arranged, that press the paper webs N1, N2, and N3 against one another and against the sliding surface defined by the heated plates 103.
  • a continuous flexible member 107 is arranged, drawing the cardboard being formed.
  • Figure 2 shows only a portion of the device, being understood that it can extend also beyond the portion shown in this figure, presenting an even very high number of heated plates 103 arranged sequentially along the cardboard feed direction F. More in particular, in the portion of device 101 shown in figure 2 only two groups of heated plates 103 are visible, indicated respectively with 109A and 109B. In this embodiment, the first group 109A comprises four heated plates 103, whilst the second group 109B contains six heated plates 103. It should be understood that the number of groups and the number of plates for each group can vary without however affecting the description of the present invention.
  • Number 111 indicates the steam supply line coming from a boiler not shown in this figure.
  • the device comprises a plurality of pressure regulating valves equal in number to the groups 109A, 109B ... into which the heated plates 103 are subdivided.
  • two pressure regulating valves are present, indicated with 113A for the group 109A of heated plates 103 and with 113B for the group 109B of heated plates 103.
  • the pressure regulating valves 113A and 113B are joined by means of a duct 115A and 115B respectively to a first steam collector 117A and to a second steam collector 117B for the first group 109A of heated plates 103 and for the second group 109B of heated plates 103, respectively.
  • each steam collector 117A, 177B is separately connected with each heated plate 103 of the respective group 109A, 109B. In this way the steam is distributed, at the pressure set through the pressure regulating valve 113A or 113B, into all the heated plates 103 of one or of the other of the groups 109A and 109B.
  • Each group 109A, 109B of heated plates 103 furthermore comprises a condensate collector 121A, 121B. All the heated plates 103A of the group 109A are connected with the condensate collector 121A through respective ducts 122A, while all the heated plates 103 of the group 109B are connected with the condensate collector 121B through ducts 122B. In this way the condensate forming in the plates 103 of the group 109A is collected in the condensate collector 121A, while the condensate forming in the heated plates 103 of the group 109B is collected in the condensate collector 121 B.
  • Each condensate collector 121A, 121B of the various groups 109A, 109B ... is connected with a common condensate collecting line indicated with 130.
  • the condensate collectors 121 A and 121B are connected with the common condensate collecting line 130 through respective ducts 132A, 132B.
  • a respective intercepting valve, indicated with 134A for the condensate collector 121A and with 134B for the condensate collector 121B, is arranged on each duct 132A, 132B .
  • These intercepting valves will be indicated below as condensate relief valves, being understood that they can be designed as simple intercepting valves.
  • the condensate forming in the plates of each group 109A, 109B ... can be collected in the common condensate collecting line 130 thus discharging the condensate of all groups 109A, 109B ...of heated plates 103 into a condensate storage tank 136.
  • the condensate storage tank 136 can be provided with a level detector, for example a float, a pair of level sensors or any other device suitable for detecting the quantity of condensate collected in the condensate storage tank 136.
  • the condensate level detecting device is schematically indicated with 138.
  • the condensate storage tank 136 furthermore comprises an exit 137 connected with a condensate recovery line 140 that brings the condensate back to the steam generator (not shown in figure 2 ).
  • An intercepting valve 142 is arranged between the exit 137 of the condensate storage tank 136 and the condensate recovery line 140.
  • the condensate storage tank 136 is furthermore connected with the steam supply line 111 through a duct 144.
  • an intercepting valve 146 can be arranged for selectively opening and closing the duct 144.
  • the device described above operates traditionally as regards gluing of the webs N1, N2, and N3 and as regards the steam feed into the single groups 109A, 109B of heated plates 103.
  • the pressure regulating valves 113A, 113B associated with the various groups 109A, 109B ... of heated plates 103 allow to maintain the steam pressure inside these plates at the value corresponding to the temperature which is required in the various sections of the cardboard feed path.
  • the device 101 does not provide for individual condensate storage tanks for each group of heated plates; a pressurized steam pumping system in the single storage tanks is thus not provided.
  • a pressurized steam pumping system in the single storage tanks is thus not provided.
  • only one storage tank 136 is provided, receiving the condensate from the various groups 109A, 109B ... of heated plates 103.
  • the condensate is therefore fed at variable pressure according to the steam pressure inside the various groups 109A, 109B ...
  • the condensate relief valves 134A, 134B ..., connecting each group 109A, 109B of heated plates 103 with the common condensate collecting line 130, are opened selectively.
  • an adequate control system manages the opening and closing of the single condensate relief valves 134A, 134B ... as follows.
  • the condensate relief valve corresponding to the group 109A, 109B ... of heated plates 103 where there is the lowest pressure, is opened firstly. Supposing for instance that the steam pressure in the heated plates 103 of the group 109A is equal to 4 Bar and the steam pressure in the heated plates 103 of the group 109B is equal to 8 Bar, in a first phase the control unit 150 will maintain the condensate relief valve 134B closed and will open the condensate relief valve 134A. In this way, supposing that in this phase the pressure inside the condensate storage tank 136 is equal to or lower than 4 Bar, i.e.
  • the condensate collected by the collector 121A is discharged, through the duct 132A and the condensate relief valve 134A, into the common condensate collecting line 130 and from here into the condensate storage tank 136.
  • the control unit 150 closes the condensate relief valve 134A and opens the condensate relief valve 134B to discharge the collected condensate from the heated plates 103 of the group 109B.
  • the control unit closes the condensate relief valve 134B and, if necessary, opens the condensate relief valve of the subsequent group 109 of heated plates 103 that is under the immediately higher pressure. The process is repeated for a number of times equal to the number of groups 109A, 109B ... into which the heated plates 103 of the device 101 are subdivided.
  • the condensate collected in the respective collector 121A, 121B is completely discharged. This is however not necessary. It is also possible for the condensate to be discharged only partially.
  • the condensate discharge can occur by timing the opening steps of the condensate relief valves 134A, 134B.
  • control unit 150 can be connected with the device 138 for detecting the condensate level in the condensate storage tank 136 and operate as follows. Once one of the condensate relief valves 134A, 134B has been opened, the condensate, discharged into the common condensate collecting line 130, discharging into the condensate storage tank 136 will cause a gradual increase in the level detected by the detecting device 138.
  • the condensate level in the condensate storage tank 136 remains constant, or it changes in an imperceptible manner, due to the fact that anyway the condensate formation is a continuous phenomenon and thus the steam condensation occurs also during the discharge step.
  • the condensate formation speed is negligible if compared to the condensate discharge speed from the condensate collector.
  • the control unit 150 interprets the substantially constant condensate level in the condensate storage tank 136 as a signal of complete condensate discharge from the group 109A, 109B ... that in this phase is with the discharge valve 134A, 134B ... opened.
  • the relief valve in question will be therefore closed and the control unit will open the subsequent relief valve.
  • control unit 150 can start a cycle of pumping the condensate from the condensate storage tank 136 toward the condensate recovery line 140. This occurs as follows.
  • the intercepting valve 142 on the exit 137 of the condensate storage tank 136 is closed, to pump the condensate from the condensate storage tank 136 to the condensate recovery line 140 said intercepting valve 142 is opened and the condensate relief valves 134A, 134B ... are closed.
  • the valve 146 on the steam line 144 is opened. This means that the steam under the pressure from the steam supply line 111, for example 15 Bar, is fed into the condensate storage tank 136, thus pumping the condensate through the exit 137 toward the recovery line 140.
  • the steam valve 146 is closed and, immediately after that, also the intercepting valve 142 is closed.
  • the pressure is equal to the steam pressure of the steam supply line 111.
  • This pressure can be discharged through a discharge duct 152 or by opening the condensate relief valve 134A, 134B ... of the group 109A, 109B ... of heated plates 103 where there is the highest pressure.
  • a small steam quantity will be dispersed toward the environment.
  • the steam pressure will slightly increase temporarily inside the group of heated plates 103 where the steam discharge occurs.
  • the device can perform a new condensate recovering cycle from the various collectors 121A, 121B ... with the process of selective opening the condensate relief valves 134A, 134B .... described above.
  • the cycle of selective opening the condensate relief valves 134A, 134B can be repeated automatically and sequentially at adequate time intervals. In other embodiments it is possible to detect the condensate level accumulated in the various condensate collectors 121A, 121B ... and therefore open selectively the condensate relief valves 134A, 134B ... according to the accumulated condensate level.
  • the condensate discharge occurs sequentially, starting from the group 109A, 109B ... with the lowest pressure until the group 109A, 109B ... with the highest pressure, by sequentially discharging all the condensate collectors 121A, 121B ...(if necessary controlling the opening time of the condensate relief valves 134A, 134B ...
  • the condensate coming from groups 109A, 109B ... of heated plates 103, wherein are different steam pressures are provided will be anyway discharged in the common condensate collecting line 130, the discharge being controlled so as to selectively and sequentially open the pressure relief valves 134A, 134B, through which the discharge is required, passing from groups of heated plates 103 with a lower pressure to groups of heated plates 103 with a higher pressure.
  • Figure 3 schematically shows the essential elements of the steam circuit and condensate circuit of a device 101 according to the invention, where four groups of heated plates are illustrated.
  • the same numbers indicate identical or equivalent parts to those illustrated in figure 2 .
  • the diagram in figure 3 schematically shows also the steam generator 160 connected with the steam supply line 111 and with the condensate recovery line 140.
  • Four groups 109A, 109B, 109C and 109D of heated plates 103 are indicated in the diagram of figure 3 .
  • the various groups of heated plates 103 are represented separate from one another only for the sake of clarity, but it should be understood that actually the plates 103 of the various groups 109A, 109B, 109C, and 109D form a continuous sliding surface, as shown in figure 2 .
  • the group 109A comprises three heated plates 103, while each of the groups 109B, 109C and 109D comprises four heated plates 103.
  • An incondensable gases relief duct can be associated with the condensate storage tank 136. This relief duct can match with the steam relief duct 152 for discharging steam once the condensate has been pumped from the condensate storage tank 136 toward the recovery line 140. In the illustrated example on the line 152 two valves 162 and 164 are provided for discharging the incondensable gases and steam once the condensate has been completely discharged from the condensate storage tank 136 to the condensate recovery line 140.
  • a steam collector for distributing the steam coming from the line 111 to the various plates 103
  • a condensate collector for collecting the condensate from the various plates 103
  • the device can be further simplified by providing a single collector for each plate group 109A, 109B, 109C, 109D, ... for both the steam distribution and the condensate collection.
  • the schema of this steam and condensate collector is represented in figures 4 and 5 only as regards a group of four heated plates.
  • 115 indicates the steam supply line, 103 the heated plates, and 103A the hollow spaces thereof inside which the steam flows and the condensate forms.
  • 130 indicates the common condensate collecting line, 132 indicates the duct along which is arranged the condensate relief valve 134 for discharging condensate from the group of heated plates 103.
  • a single collector is provided, indicated as a whole with number 201 and advantageously formed as a tubular body, formed for example by one or more sections or portions connected with one another, for example through flanged connections.
  • the tubular body of the collector 201 is formed by five sections connected through respective flanges. It should be however understood that the tubular body of the collector 201 can also be formed in a different manner, with a different number of sections or even with a single section.
  • the steam supply duct 115 is connected with the collector 201 for example at the flange 115F.
  • the collector 201 is furthermore provided with a plurality of ducts 122, which are connected with the highest part of the collector 201 and through which the pressurized steam coming from the duct 115 is injected in the single plates 103.
  • four plates 103 and four ducts 122 are provided, one for each plate.
  • Each duct 112 advantageously ends with a portion 119X projecting inside a space 103A of the respective heated plate 103, so as to prevent condensate from flowing through the duct 119 towards the inside of the collector 201.
  • each duct 122 forms preferably a sort of siphon, with a curve 122X ( figure 5 ) where the condensate accumulates, closing the duct 122 to the steam flow also in the case the collector 201 has been drained by opening the condensate relief valve 134.
  • the device can be further simplified, reducing the number of collectors and ducts and therefore decreasing the production, maintenance and repair costs as well as the overall dimensions of the components of the device 101.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Laminated Bodies (AREA)
  • Paper (AREA)

Claims (24)

  1. Vorrichtung zur Herstellung von Wellpappe, umfassend:
    einen Zuführweg für Wellpappe (N1, N2, N3); entlang des Zuführweges eine Reihe von hintereinander angeordneten beheizten Platten (103), die eine Gleitfläche für die Wellpappe bilden, wobei die Reihe von beheizten Platten in eine Mehrzahl von Gruppen (109A, 109B, 109C, 109D) von beheizten Platten (103) unterteilt ist, Presselemente (105), um die Wellpappe (N1, N2, N3) gegen die Gleitfläche zu drücken, einen Heizdampfkreislauf zum Beheizen der beheizten Platten (103), wobei der Heizdampfkreislauf umfasst:
    - eine Zuführleitung (111) für unter Druck stehenden Dampf;
    - für jede Gruppe (109A, 109B, 109C, 109D) von beheizten Platten (103) ein Druckregulierungsventil (113A, 113B) zwischen der Zuführleitung (111) für unter Druck stehenden Dampf und den beheizten Platten (103) der jeweiligen Gruppe (109A - 109D) von beheizten Platten, um den beheizten Platten Dampf unter reguliertem Druck zuzuführen, wobei
    für jede Gruppe von beheizten Platten (103) ein Kondensat-Entlastungsventil (134A, 134B, 134C, 134D) vorgesehen ist, das die beheizten Platten (103) der jeweiligen Gruppe (109A, 109B, 109C, 109D) mit einer gemeinsamen Kondensatsammelleitung (130, 136) verbindet,
    so dass die mehreren Gruppen (109A, 109B, 109C, 109D) von beheizten Platten (103) an die gemeinsame Kondensatsammelleitung (130, 136) angeschlossen sind, und
    dadurch gekennzeichnet, dass
    ein Steuersystem (150) zum Öffnen und Schließen der Kondensat-Entlastungsventile (134A - 134D) vorgesehen ist, wobei das Steuersystem (150) das selektive Öffnen und Schließen der Kondensat-Entlastungsventile (134A - 134D) steuert, um Kondensat selektiv von jeder der Gruppen (109A, 109B, 109C, 109D) von beheizten Platten (103) zu der gemeinsamen Kondensatsammelleitung (130) abzuführen.
  2. Vorrichtung nach Anspruch 1, wobei diese eine Kondensat-Rückgewinnungsleitung (140) umfasst, aus der das über die gemeinsame Kondensatsammelleitung (130, 136) gesammelte Kondensat für einen Dampfgenerator (160) zurückgewonnen wird.
  3. Vorrichtung nach Anspruch 1 oder 2, wobei die gemeinsame Kondensatsammelleitung (130, 136) einen Speicherbehälter (136) für das von den mehreren Gruppen von beheizten Platten kommende Kondensat umfasst.
  4. Vorrichtung nach Anspruch 1 oder 2 oder 3, wobei diese für jede Gruppe (109A, 109B, 109C, 109D) von beheizten Platten (103) einen Dampfkollektor (117A, 117B, 117C, 117D) umfasst, der zwischen dem jeweiligen Druckregulierungsventil (113A, 113B, 113C, 113D) und den beheizten Platten (103) der jeweiligen Gruppe (109A, 109B, 109C, 109D) von beheizten Platten angeschlossen ist.
  5. Vorrichtung nach einem oder mehreren der vorhergehenden Ansprüche, wobei diese für jede Gruppe (109A, 109B, 109C, 109D) von beheizten Platten (103) einen Kondensatkollektor (121A, 121B, 121C, 121D) umfasst, der zwischen den beheizten Platten (103) der jeweiligen Gruppe und dem Kondensat-Entlastungsventil (134A, 134B, 134C, 134D) angeschlossen ist.
  6. Vorrichtung nach Anspruch 1 oder 2 oder 3, wobei diese für jede Gruppe (109A, 109B, 109C, 109D) von beheizten Platten (103) einen Dampf- und Kondensatkollektor (201) umfasst, der zwischen der Dampfzuführleitung (111) und den beheizten Platten (103) der jeweiligen Gruppe (109A, 109B, 109C, 109D) von beheizten Platten und zwischen den beheizten Platten und der gemeinsamen Kondensatsammelleitung (130) angeschlossen ist, wobei das jeweilige Kondensat-Entlastungsventil (134A, 134B, 134C, 134D) zwischen jedem Dampf- und Kondensatkollektor (201) und der gemeinsamen Kondensatsammelleitung (130) angeordnet ist.
  7. Vorrichtung nach Anspruch 6, wobei der Dampf- und Kondensatkollektor (201) ein rohrförmiges Volumen umfasst, das mit jeder beheizten Platte (103) der jeweiligen Gruppe (109A, 109B, 109C, 109D) von beheizten Platten verbunden ist, und zwar über mindestens einen jeweiligen Dampfabführanschluss (119) und über mindestens einen jeweiligen Kondensatkollektoranschluss (122).
  8. Vorrichtung nach Anspruch 7, wobei jeder der Kondensatkollektoranschlüsse (122) einen Siphon (122X) zwischen der jeweiligen beheizten Platte (103) und dem jeweiligen Dampf- und Kondensatkollektor (201) bildet.
  9. Vorrichtung nach einem der vorhergehenden Ansprüche, wobei das Steuersystem (150) zum nacheinander erfolgenden Öffnen der Kondensat-Entlastungsventile (134A - 134D) ausgelegt ist.
  10. Vorrichtung nach Anspruch 9, wobei das Steuersystem (150) zum nacheinander erfolgenden Öffnen der Kondensat-Entlastungsventile (134A - 134D) ausgelegt ist, beginnend mit dem Kondensat-Entlastungsventil (134A - 134D) der unter minimalem Druck stehenden Gruppe (109A, 109B, 109C, 109D) von beheizten Platten (103) bis zu dem Kondensat-Entlastungsventil der unter maximalem Druck stehenden Gruppe von beheizten Platten.
  11. Vorrichtung nach zumindest Anspruch 2, wobei die gemeinsame Kondensatsammelleitung (130) mit der Zuführleitung (111) für unter Druck stehenden Dampf über ein Einlassventil (146) für unter Druck stehenden Dampf verbunden ist, um das Kondensat zu der Kondensat-Rückgewinnungsleitung (140) hin auszustoßen.
  12. Vorrichtung nach zumindest Anspruch 2, wobei zwischen der gemeinsamen Kondensatsammelleitung und der Kondensat-Rückgewinnungsleitung (140) ein Rückflussventil (142) angeordnet ist.
  13. Vorrichtung nach einem oder mehreren der vorhergehenden Ansprüche, wobei dem Kondensat-Speicherbehälter (136) ein Füllstandsdetektor (138) zugeordnet ist, der mit einem Steuersystem (150) zum Steuern der Kondensatabführung aus dem Speicherbehälter (136) verbunden ist.
  14. Vorrichtung nach Anspruch 14, wobei das Steuersystem (150) dafür ausgelegt ist, die Menge an Kondensat, das von jeder Gruppe (109A, 109B, 109C, 109D) von beheizten Platten (103) abgeführt wird, zu erfassen und die Öffnungszeiten für die Kondensat-Entlastungsventile (134A - 134D) der verschiedenen Gruppen (109A, 109B, 109C, 109D) von beheizten Platten (103) gemäß der pro Zeiteinheit angesammelten Kondensatmenge zu modifizieren.
  15. Vorrichtung nach zumindest Anspruch 2, wobei diese einen Druckmessaufnehmer an der Kondensat-Rückgewinnungsleitung (140) umfasst, und wobei ein Steuersystem (150) das Öffnen eines der Kondensat-Entlastungsventile (134A - 134B) einer Gruppe von beheizten Platten (103) steuert, in deren Innerem ein größerer Druck herrscht als der Druck in der Kondensat-Rückgewinnungsleitung (140), um Kondensat aus dem Kondensat-Speicherbehälter (136) in Richtung der Rückgewinnungsleitung (140) abzuführen.
  16. Vorrichtung nach zumindest Anspruch 5, wobei jedem Kondensatkollektor (121A - 121D) ein Kondensat-Füllstandsdetektor zugeordnet ist, und wobei das jeweilige Kondensat-Entlastungsventil (134A - 134D) entsprechend dem von dem jeweiligen Kondensat-Füllstandsdetektor erfassten Kondensatfüllstand geöffnet wird.
  17. Vorrichtung nach zumindest Anspruch 6, wobei jedem Dampf- und Kondensatkollektor (201) ein Kondensat-Füllstandsdetektor zugeordnet ist, und wobei das jeweilige Kondensat-Entlastungsventil (134) entsprechend dem von dem entsprechenden Kondensat-Füllstandsdetektor erfassten Kondensatfüllstand geöffnet wird.
  18. Kondensatrückgewinnungsverfahren in einer Vorrichtung zur Herstellung von Wellpappe, welche umfasst: einen Zuführweg für Wellpappe (N1, N2, N3); entlang des Zuführweges eine Reihe von hintereinander angeordneten beheizten Platten (103), die eine Gleitfläche für die Wellpappe bilden, wobei die Reihe von beheizten Platten in eine Mehrzahl von Gruppen (109A, 109B, 109C, 109D) von beheizten Platten (103) unterteilt ist, Presselemente (105), um die Wellpappe (N1, N2, N3) gegen die Gleitfläche zu drücken, einen Heizdampfkreislauf zum Beheizen der beheizten Platten (103),
    dadurch gekennzeichnet, dass
    - das Kondensat von jeder der Gruppen (109A, 109B, 109C, 109D) von beheizten Platten selektiv in eine gemeinsame Kondensatsammelleitung (130) abgeführt wird;
    - und dass das in die gemeinsame Kondensatsammelleitung (130) abgeführte Kondensat einer Kondensat-Rückgewinnungsleitung (140) zugeführt wird.
  19. Verfahren nach Anspruch 18, welches folgende Schritte umfasst:
    - selektives Abführen des Kondensats, das in entsprechenden Kollektoren (121A - 121D; 201) gesammelt wurde, die den Gruppen (109A - 109D) von beheizten Platten zugeordnet sind, und Befördern des Kondensats in einen Kondensat-Speicherbehälter (136) über die gemeinsame Kondensatsammelleitung (130);
    - Erfassen des Kondensatfüllstandes in dem Kondensat-Speicherbehälter (136);
    - entsprechend dem erfassten Füllstand, Ausstoßen von Kondensat aus dem Kondensat-Speicherbehälter (136) zu der Kondensat-Rückgewinnungsleitung (140).
  20. Verfahren nach Anspruch 18 oder 19, welches die Schritte des nacheinander erfolgenden Abführens von Kondensat von mindestens einigen der Gruppen (109A, 109B, 109C, 109D) von beheizten Platten umfasst, beginnend mit derjenigen Gruppe von beheizten Platten, in deren Innerem Dampf unter niedrigstem Druck steht, bis zu derjenigen Gruppe von beheizten Platten, in deren Innerem Dampf unter höchstem Druck steht.
  21. Verfahren nach Anspruch 20, wobei die Schritte des nacheinander erfolgenden Abführens von Kondensat in Zeitabständen erfolgen, die von einem Steuersystem festgelegt werden.
  22. Verfahren nach Anspruch 20 oder 21, welches die Schritte der Ausführung von Zyklen eines nacheinander erfolgenden Abführens von Kondensat von den Gruppen von beheizten Platten umfasst, wobei in jedem Zyklus das Kondensat von jeder der Gruppen von beheizten Platten (109A, 109B, 109C, 109D) abgeführt wird.
  23. Verfahren nach Anspruch 18 oder 19, welches folgende Schritte umfasst: Erfassen des Kondensatfüllstandes in einem Kollektor (121; 201), der jeder Gruppe von beheizten Platten (109A, 109B, 109C, 109D) zugeordnet ist; Auslösen der Kondensatabführung von den Gruppen von beheizten Platten entsprechend dem in den Kondensatkollektoren erfassten Kondensatfüllstand.
  24. Verfahren nach einem oder mehreren der Ansprüche 18 bis 23, wobei das Kondensat durch Einleiten von Dampf mit einem Druck, der größer ist als der Druck im Inneren der gemeinsamen Kondensatsammelleitung (130), der Rückgewinnungsleitung (140) zugeführt wird.
EP20120425018 2011-02-02 2012-01-30 Vorrichtung zur Herstellung von Wellpappe und Kondensatrückgewinnungsverfahren Active EP2484516B1 (de)

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CN109466122A (zh) * 2018-12-27 2019-03-15 佛山市富利包装机械有限公司 一种纸板定型加压装置
IT201900006568A1 (it) 2019-05-06 2020-11-06 Fosber Spa Metodo e dispositivo per il controllo della trazione del cartone ondulato nei piani caldi di una linea di produzione
US20240017516A1 (en) 2020-08-31 2024-01-18 Fosber S.P.A. Plant and method for producing a corrugated board

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US6110095A (en) * 1997-04-18 2000-08-29 United Container Machinery Inc. Apparatus for heating corrugated paperboard
US6074520A (en) * 1998-04-08 2000-06-13 Marquip, Inc. Heated holddown mat for corrugator double backer
EP1362691B1 (de) 2002-05-16 2006-08-23 FOSBER S.p.A. Vorrichtung zum Regeln des Abstands zwischen einem Klebestoffauftragszylinder und eine Riffelwalze für eine Wellpappenmaschine
ES2269965T3 (es) 2003-06-27 2007-04-01 Fosber S.P.A. Dispositivo para unir hojas de carton para formar carton ondulado.
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CN111923504A (zh) * 2019-05-13 2020-11-13 广东佛斯伯智能设备有限公司 用于双面机的热板以及包括多个所述热板的双面机

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