EP3405612B1 - Yankee dryer cylinder operating without steam - Google Patents
Yankee dryer cylinder operating without steam Download PDFInfo
- Publication number
- EP3405612B1 EP3405612B1 EP17707658.5A EP17707658A EP3405612B1 EP 3405612 B1 EP3405612 B1 EP 3405612B1 EP 17707658 A EP17707658 A EP 17707658A EP 3405612 B1 EP3405612 B1 EP 3405612B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hollow shaft
- dryer cylinder
- yankee dryer
- flow
- fixed hollow
- 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.)
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Links
- 238000007599 discharging Methods 0.000 claims description 32
- 239000007789 gas Substances 0.000 claims description 28
- 238000001035 drying Methods 0.000 claims description 27
- 238000005192 partition Methods 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 6
- 239000003517 fume Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 239000004744 fabric Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
- D21F5/021—Construction of the cylinders
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
- D21F5/022—Heating the cylinders
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/18—Drying webs by hot air
- D21F5/181—Drying webs by hot air on Yankee cylinder
Definitions
- the present invention relates to the field of machines for producing paper and similar products and, in particular, relates to an improved structure of dryer cylinder, also known as Yankee dryer cylinder, or simply Yankee cylinder.
- the plants for producing paper provide the use of a headbox for distributing a mixture of cellulosic fibres and water on a forming fabric, and, in some cases, additives of different kinds. In this way, a determined amount of water is drained and, then, the dry content of the mixture layer arranged on the forming fabric is increased.
- the content of water is, then, reduced, through a sequence of passages among many fabrics and/or felts of the mixture layer, up to reach a consistency such that allows to pass through a drying section.
- This usually comprises at least a dryer cylinder, also called “Yankee dryer cylinder”, or simply “Yankee cylinder” and a drying hood that is fed with hot air.
- the web of treated humid paper is laid on the external surface of the Yankee cylinder, while the inside of the Yankee cylinder is heated, for example, by introducing steam.
- the web of humid paper which is laid on the external surface, is gradually dried.
- the web of paper is removed from the external surface of the Yankee cylinder by means of a blade, or a doctor blade, or by tensioning, depending on the desired product, and, in particular, crêpe paper, or smooth paper.
- a Yankee cylinder comprises essentially two heads, or end walls, between which a cylindrical shell is positioned.
- a bearing journal which is mounted, in operating conditions, on a respective bearing, is fixed to each head.
- a hollow shaft is mounted inside the shell.
- the heads and/or the shell are provided with inspection apertures through which at least a worker enters into the cylinder for carrying out, periodically, ordinary, or extraordinary maintenance interventions.
- the constituent elements of the Yankee cylinder i.e. the heads, the shell, the bearing journals etc. can be obtained by iron casting and can be fixed by means of bolts.
- the Yankee cylinders can be made of steel.
- the two heads can be fixed to the cylindrical shell by means of screw bolts, or more frequently by means of weld beads.
- the cylindrical shell has an internal surface provided with circumferential grooves. These are adapted to collect the condensate formed for the transfer, toward outside, of the latent heat of vaporization from the steam that has been introduced inside the Yankee cylinder.
- thermo-elastic stresses caused by the high temperature of the steam that is introduced inside dryer cylinder.
- the solution described in this document provides a central duct and a shell rotating about a shaft.
- the combustion air is introduced through the duct and fed to some burners arranged, in determined positions, within the cylinder.
- the burners therefore, produce the heat that hits the shell.
- the exhaust fumes exit the central duct, at the opposite side of the inlet of air.
- EP0708301A1 does not appear to be particularly advantageous. In fact, it is necessary to allocate not a little space, to the housings of the burners, of the air feed ducts, and of the discharging ducts of the burnt gases. This considerably decreases the surface available for the heat exchange, thus reducing the efficiency of the machine.
- a further drawback of the solution described in EP0708301 is that the internal volume of the cylinder can become saturated with inflammable gases and, therefore, the flame, which is produced by the internal burners, can cause explosions and, therefore, exposing the workers to risks, besides compromising the efficacy of the plant.
- an object of the present invention to provide a Yankee dryer cylinder that is able to solve the above disclosed drawbacks of the Yankee cylinders of prior art, and, in particular, that is able to provide a uniform heat distribution at the internal surface of the shell and, therefore, to produce a final product of high quality.
- a Yankee dryer cylinder comprising:
- the hot gas can be a mixture of gases.
- the mixture of gases can be, in particular, air.
- the temperature of the flow of hot gas can be set between 100 °C and 750 °C, advantageously set between 250 and 700 °C, preferably set between 300 °C and 600 °C.
- the flow of hot gas can be a flow of combustion fumes having a temperature higher than 100 °C.
- a feeding device for feeding a flow of hot air, said feeding device arranged to feed said the flow of hot air into said feeding portion of said cavity through said inlet mouth.
- a suction device downstream of said Yankee dryer cylinder, is provided that is connected to the outlet mouth of the fixed hollow shaft.
- the suction device is arranged to suck the flow of hot gas that is fed into the cavity of the fixed hollow shaft through the inlet mouth. In this way it is possible to assist the exit of the gas from the dryer cylinder.
- the internal surface of the cylindrical shell provides a plurality of circumferential grooves.
- a plurality of distributor members is provided in the internal chamber arranged to distribute the flow of hot air, which comes from said cavity of said fixed hollow shaft, on the internal surface of the shell.
- each distributor member of the above disclosed plurality is arranged to distribute a share of flow of hot air fed into the cavity of the fixed hollow shaft, on a respective determined portion of the internal surface of the shell.
- the distributor members are configured in such a way to define, in the internal chamber, a predetermined path for the hot air between the cavity of the feeding portion and the cavity of the discharging portion.
- the Yankee cylinder and the fixed hollow shaft are arranged coaxially to each other.
- each distributor member is tubular-shaped, and it is provided with at least one inlet aperture facing towards at least one feeding hole of the lateral surface of the fixed hollow shaft, and at least one distribution aperture facing towards the internal surface of the cylindrical shell.
- the feeding aperture can be associated to a feeding panel provided with a plurality of inlet holes.
- This technical solution in particular, is adopted in the case in which the feeding panel is arranged in front of a plurality of suction holes.
- the above disclosed plurality of distributor members is integral to the fixed hollow shaft.
- each distributor member is arranged in front of a predetermined number of suction holes.
- the feeding portion is provided with a plurality of feeding holes and the discharging portion is provided with a plurality of discharging holes.
- both the feeding holes and the discharging holes are advantageously arranged on respective rows.
- the plurality of feeding holes and the plurality of discharging holes are distributed along all the perimeter of the fixed hollow shaft.
- the rows, along which, the feeding holes, and the discharging holes are distributed can be oriented longitudinally to the fixed hollow shaft.
- each distributor member can be oriented such that the respective feeding aperture is positioned on the respective row of the suction holes.
- At least a first and a second bearing are mounted that are arranged at opposite end portions.
- a plant for drying a humid web of paper comprises:
- a structure of Yankee dryer cylinder 1 comprises a cylindrical shell 10 having a internal surface 11. Furthermore, a first and a second heads, or end walls, 71 and 72, are provided that are fixed at the opposite ends of the cylindrical shell 10. This latter is rotatably mounted about a fixed hollow shaft 20 having a cavity 21 and a lateral surface 22 provided with a plurality of holes 25.
- the fixed hollow shaft 20 is provided, in particular, with an inlet mouth 23, through which a flow of hot gas 100, preferably a flow of hot air, in particular having a temperature higher than 100 °C, is fed into the cavity 21.
- the temperature of the hot air is advantageously less than 700 °C in order to avoid to generate too high thermoelastic stresses on the structure of cylinder 1.
- the fixed hollow shaft 20 is, then, provided with an outlet mouth 24 provided at the opposite side of inlet mouth 23.
- outlet mouth 24 Through the outlet mouth 24, the flow of hot air 100, which is introduced through the inlet mouth 23, exits the dryer cylinder 1 after having hit the internal surface 11 of shell 10.
- a partition wall 35 is provided mounted in such a way to divide the fixed hollow body 20 in a feeding portion 20a, arranged upstream of the partition wall 35, and in a discharging portion 20b, arranged downstream of the partition wall 35 ( figure 6 ).
- the flow of hot air 100 that is fed into the cavity 21 of the feeding portion 20a is arranged to pass, through a plurality of feeding holes 25a, into an internal chamber 30 defined between the internal surface 11 of cylindrical shell 10 and the lateral surface 22 of the hollow shaft 20.
- the flow of hot air 100 hits, therefore, the internal surface 11 and, then, enters the discharging portion 20b of cavity 21 through a plurality of discharging holes 25b. These are, in particular, closer to the outlet mouth 24 than the feeding holes 25a.
- the partition wall 35 is arranged transversely to the fixed hollow shaft 20, in particular, it is substantially orthogonal to the longitudinal axis 102 of the fixed hollow shaft 20. In this case, therefore, the feeding portion 20a is closer to the inlet mouth 23, and the discharging portion 20b is closer to the outlet mouth 24.
- the partition wall 35 is, instead, oriented longitudinally to the fixed hollow body 20.
- the feeding portion 20a is positioned in the upper part of the fixed hollow shaft 20, while the discharging portion 20b is arranged in the lowest part.
- the Yankee dryer cylinder 1 provides a plurality of distributor members 40 housed within the internal chamber 30. More in detail, each distributor member 40 is adapted to distribute a share of the flow of hot air 100 coming from the feeding portion 20a of cavity 21, on a respective determined portion of the internal surface 11 of shell 10.
- each distributor member 40 can be oriented radially to the Yankee cylinder 10.
- each distributor member 40 can extend longitudinally to the Yankee cylinder 10.
- each distributor member 40 is tubular-shaped, for example parallelepiped-shaped.
- each distributor member 40 can provide at least one inlet aperture 41 facing towards at least a feeding hole 25a of the feeding portion 20a of fixed hollow shaft 20, and at least one distribution aperture 42 facing towards the internal surface 11 of the cylindrical shell 10.
- the distribution aperture 42 of the distributor member 40 is advantageously associated to a distribution panel 45 provided with a plurality of distribution holes 46. These can be uniformly distributed on the surface of the distribution panel 45, in such a way to uniformly distribute the share of the flow of hot air 100, which is delivered by the distributor member 40, on a respective portion of the internal surface 11 of cylindrical shell 10.
- the distribution holes 46 of the distribution panel 45 are frustoconical-shaped. In this way, it is possible to reduce the pressure drop in the holes, and, therefore, to increase the flow of hot air hitting the shell 10.
- the internal surface 11 of shell 10 is shown provided with a plurality of circumferential grooves 15, only as an example.
- the internal surface 11 of shell 10 is not necessarily provided with circumferential grooves.
- the distribution panel 45 can be a distribution plate made of a stiff material.
- the distribution panel 45 can be made of a porous material, for example a woven fabric, or a nonwoven fabric, or similar materials, provided of a predetermined level of porosity. In this case, the pores of the material of which the panel is made, act as distribution holes.
- the distributor members 40 are arranged at predetermined distance from each other and the distribution apertures 42 are arranged at a predetermined distance from the internal surface 11 of shell 10. More in detail, space 50, which is defined by the lateral surfaces facing each other 43 and 44 of two next distributor members 40, in use, is passed through by an exiting flow of hot air. In fact, the flow of hot air coming from cavity 21 of the fixed hollow shaft 20, once distributed by each distributor member 40 on a corresponding portion of internal surface of the cylindrical shell 10, is forced to pass into the space 50, which is arranged downstream of the distributor member 40, from which it comes from, in particular owing to the rotational motion of cylindrical shell 10.
- the feeding holes 25a and the discharging holes 25b are positioned on respective rows longitudinal to the fixed hollow shaft 20. More precisely, as shown in detail in the figures 5 and 6 , the feeding holes 25a and the discharging holes 25b are positioned on respective staggered longitudinal rows, i.e. arranged on the external surface of the fixed hollow shaft 21, but at different generatrix, in case of cylindrical geometry of the shaft 20, as shown in the figure, or, however, along different directions, but parallel to the axis of the shell 10, in the case in which the shaft 20 has a different geometry, for example a parallelepiped geometry.
- each row of discharging holes 25b is arranged downstream of a respective row of feeding holes 25a with respect to the advancing direction of the flow of hot air 100 along the internal surface 11 of shell 10. This is determined by the rotational direction of cylindrical shell 10 about its axis of rotation. In this way, therefore, an obligatory path is obtained for the flow of hot air 100 that is, thus, forced to pass from cavity 21 of the fixed hollow shaft 20, into distributor member 40, through the feeding holes 25a, e, after having hit the internal surface 11 del cylindrical shell 10, to pass into the space 50 defined between two next distributor members 40.
- the inlet mouth 23 and the outlet mouth 24 are arranged at the same side of the fixed hollow body 20.
- a closing wall 26 is provided at the end of the fixed hollow shaft 20 that is opposite to the inlet mouth and to the outlet mouth 24. In this way, it is possible to simplify the construction.
- a shaft 80 having a small diameter since there is no further need of using a duct with a great diameter for the exit of hot air from Yankee cylinder 1, it is sufficient a shaft 80 having a small diameter and it is, therefore, possible to use a bearing 62 having a small size.
- the partition wall 35 extends longitudinally along the fixed hollow shaft 20, but comprises two planar portions 35a and 35b inclined of a predetermined angle ⁇ .
- the feeding portion 20a of the fixed hollow shaft 20 having the feeding holes 25a is, in this case, set between the two planar portions 35a and 35b.
- the discharging portion 20b provided with the discharging holes 25b is the portion of the fixed hollow shaft 20 corresponding to a central angle ⁇ , in particular the explementary angle of that angle ⁇ . In this case, therefore, the flow of hot air is delivered at the portion 13 of the internal surface 11 of shell 10 of Yankee dryer cylinder 1.
- this embodiment can provide one, or more, distributor members 40 having, or not having, the distribution plate 45, as above described. As shown in detail in the enlargement of figure 14 , the distributor members 40 are arranged at a predetermined distance d from the internal surface 11 of shell 10.
- the hot air fed into the cavity 21 of the fixed hollow shaft 20 can be obtained, in particular, as exhaust fumes, by a machine for producing electrical energy, or by means of a cogenerator, i.e. by means of a "turbogenerator", or a different machine for producing energy that is arranged in the plant where the Yankee dryer cylinder 1, according to the invention, has to be installed, or however in the neighbourhood of the same. If it is necessary to reduce the temperature of the exhaust fumes, normally about 600-700 °C, it is sufficient to cool such exhaust fumes before feeding the same to the fixed hollow shaft 20, for example mixing the exhaust fumes with fresh air.
- the plant 200 comprises a Yankee dryer cylinder 1, as above described with reference to the figures 1 to 11 .
- the Yankee cylinder 1 is, in particular, provided with an external surface 12, on which, in use, the humid web 160 to be dried is positioned.
- Plant 200 comprises, furthermore, a drying hood 150 arranged to work in combination with the Yankee cylinder 1 in order to cause the drying of the humid web of paper.
- the drying hood 150 is arranged to suck the humidity, which is produced by contact of the humid paper web with the surface 12 of the Yankee dryer cylinder 1 and to feed a flow of hot air on said humid paper web 160.
- plant 200 provides, furthermore, a duct 180 arranged to pneumatically connect the drying hood 150 to the cavity 21 of the fixed hollow shaft 20. More precisely, the duct 180 is arranged to feed a flow of hot air, which circulates within the drying hood 150, into the cavity 21.
- This particular construction solution allows to optimize the energy consumption, in particular, for producing hot air.
- the drying hood 150 which is positioned above the Yankee dryer cylinder 1, circulates a high flow of hot air, in part, produced by the evaporation of the humidity caused by the contact of humid web of paper 160 with the external surface of Yankee cylinder 1, and, in part, produced within the drying hood 150 that is provided with at least one burner, in particular a burner powered by methane gas, for producing hot air.
- the hot air produced within the hood 150 is directed towards the humid web 160, which slides on the surface of the dryer cylinder, causing the drying of the humidity that is evaporated from the humid paper web 160.
- the drying hood 150 is, in particular, divided into a "humid" part 151 and a "dry” part 152.
- the present invention provides both the case in which the duct 180 is connected to the dry part ( figure 15A ), and the case in which the duct 180 is connected to the humid part of the hood 150 ( figure 15B ). This can be obtained, connecting the duct 180 directly to one of the two parts of the hood 150, as shown in the figures 15A and 15B , or to a respective discharging duct, this case is not shown in the figures for reasons of simplicity.
- the temperature of the air circulating within the dry part of the drying hood is about 600-700°C.
- the hot air exiting the dry part can be mixed with cold air, before introducing the same in the fixed hollow shaft 20.
- the humid part of the hood is, in particular, passed through by a flow of hot air having a temperature less than the air circulating within the dry part.
- the temperature of the air circulating within the humid part of hood 150 in fact, is about 300-400 °C and, therefore, ideal for being fed into the cavity 21 of the fixed hollow shaft 20, without incurring in the above described drawbacks.
- the fact of using humid air allows to have, under the same temperature, and because of the presence of humidity, an available thermal power greater than that of the case in which dry hot air is used.
- the hot air can be withdrawn both from the dry part 152 and from the humid part 151 of hood 150 and mixing the two flows of hot air, before feeding the hot air into the fixed hollow shaft 20.
Description
- The present invention relates to the field of machines for producing paper and similar products and, in particular, relates to an improved structure of dryer cylinder, also known as Yankee dryer cylinder, or simply Yankee cylinder.
- As known, the plants for producing paper provide the use of a headbox for distributing a mixture of cellulosic fibres and water on a forming fabric, and, in some cases, additives of different kinds. In this way, a determined amount of water is drained and, then, the dry content of the mixture layer arranged on the forming fabric is increased.
- The content of water is, then, reduced, through a sequence of passages among many fabrics and/or felts of the mixture layer, up to reach a consistency such that allows to pass through a drying section. This usually comprises at least a dryer cylinder, also called "Yankee dryer cylinder", or simply "Yankee cylinder" and a drying hood that is fed with hot air. In particular, the web of treated humid paper is laid on the external surface of the Yankee cylinder, while the inside of the Yankee cylinder is heated, for example, by introducing steam.
- Because of the steam produced inside the Yankee cylinder and of the hot air, which is blown by the hood on the paper, the web of humid paper, which is laid on the external surface, is gradually dried. When the desired drying level is achieved, the web of paper is removed from the external surface of the Yankee cylinder by means of a blade, or a doctor blade, or by tensioning, depending on the desired product, and, in particular, crêpe paper, or smooth paper.
- A Yankee cylinder comprises essentially two heads, or end walls, between which a cylindrical shell is positioned. Generally, a bearing journal, which is mounted, in operating conditions, on a respective bearing, is fixed to each head. A hollow shaft is mounted inside the shell. The heads and/or the shell are provided with inspection apertures through which at least a worker enters into the cylinder for carrying out, periodically, ordinary, or extraordinary maintenance interventions.
- The constituent elements of the Yankee cylinder, i.e. the heads, the shell, the bearing journals etc. can be obtained by iron casting and can be fixed by means of bolts.
- Alternatively, the Yankee cylinders can be made of steel. In this case the two heads can be fixed to the cylindrical shell by means of screw bolts, or more frequently by means of weld beads.
- Both in the Yankee cylinders made of cast iron and in those made of steel, the cylindrical shell has an internal surface provided with circumferential grooves. These are adapted to collect the condensate formed for the transfer, toward outside, of the latent heat of vaporization from the steam that has been introduced inside the Yankee cylinder.
- However, the Yankee cylinders that use steam as source of thermal energy have many drawbacks.
- Firstly, the great amount of steam that are necessary in these types of machines involves high running costs. Furthermore, it is necessary to use specific apparatuses both for producing steam and for transporting the steam same to the Yankee cylinder.
- In addition to what described above, in order to satisfy the safety standards provided for the apparatuses, which use pressure steam, it is necessary to adopt complicated structural solutions, in particular in order to be able to resist to the high stresses, to which the different parts of the dryer cylinder are subjected, mainly thermo-elastic stresses, caused by the high temperature of the steam that is introduced inside dryer cylinder.
- Other solutions of the state of the art provide, instead, to feed a flow of air into the cylinder, the air is then burned by one, or more burners for obtaining the necessary thermal energy. An example of Yankee cylinder using air is described in
EP0708301A1 . - In particular, the solution described in this document provides a central duct and a shell rotating about a shaft. The combustion air is introduced through the duct and fed to some burners arranged, in determined positions, within the cylinder. The burners, therefore, produce the heat that hits the shell. The exhaust fumes exit the central duct, at the opposite side of the inlet of air.
- However, the solution described in
EP0708301A1 does not appear to be particularly advantageous. In fact, it is necessary to allocate not a little space, to the housings of the burners, of the air feed ducts, and of the discharging ducts of the burnt gases. This considerably decreases the surface available for the heat exchange, thus reducing the efficiency of the machine. - Furthermore, the solution described in
EP0708301A1 , in particular, owing to the presence of the burners and the ducts, does not seem to be able to uniformly distribute the heat produced on the shell surface. This thing negatively affects the quality of the final product. - A further drawback of the solution described in
EP0708301 is that the internal volume of the cylinder can become saturated with inflammable gases and, therefore, the flame, which is produced by the internal burners, can cause explosions and, therefore, exposing the workers to risks, besides compromising the efficacy of the plant. - A further solution is described in
US3633662 . However, also this construction solution is complex and is not able to guarantee a uniform heat distribution at the internal surface of the shell. - It is, therefore, an object of the present invention to provide a Yankee dryer cylinder that is able to solve the above disclosed drawbacks of the Yankee cylinders of prior art, and, in particular, that is able to provide a uniform heat distribution at the internal surface of the shell and, therefore, to produce a final product of high quality.
- It is also an object of the invention to provide a Yankee dryer cylinder that is able to considerably reduce the running costs of the plant where it is installed.
- It is a further object of the invention to provide a Yankee dryer cylinder that has a simpler construction and is less expensive than the Yankee cylinders of prior art.
- This and other objects are achieved by a Yankee dryer cylinder, according to the present invention, comprising:
- a fixed hollow shaft having a cavity and a lateral surface provided with a plurality of holes arranged to put in communication said cavity with the external environment, said fixed hollow shaft being provided with:
- an inlet mouth through which a flow of hot gas having a predetermined temperature, in particular a temperature higher than 100 °C, is arranged to be fed into said cavity;
- an outlet mouth through which said flow of hot gas is arranged to flow outside said dryer cylinder;
- a cylindrical shell provided with an internal surface and rotatably mounted about said fixed hollow shaft, an internal chamber defined between the internal surface of said cylindrical shell and said lateral surface of said hollow shaft;
- a partition wall mounted within said cavity in such a way to divide said fixed hollow shaft in a feeding portion and in a discharging portion, said feeding portion being provided with at least one feeding hole arranged to feed said flow of hot gas, from said cavity to said internal chamber, in such a way to hit said internal surface, said discharging portion being provided with at least one discharging hole, which is pneumatically connected to said outlet mouth, said flow of hot gas, after having hit said internal surface of said shell, being arranged to pass through said, or each, discharging hole from said internal chamber to said cavity, in such a way to exit said Yankee dryer cylinder through said outlet mouth.
- In particular, the hot gas can be a mixture of gases.
- Advantageously, the mixture of gases can be, in particular, air.
- Advantageously, the temperature of the flow of hot gas can be set between 100 °C and 750 °C, advantageously set between 250 and 700 °C, preferably set between 300 °C and 600 °C.
- Alternatively, the flow of hot gas can be a flow of combustion fumes having a temperature higher than 100 °C.
- In particular, a feeding device is provided for feeding a flow of hot air, said feeding device arranged to feed said the flow of hot air into said feeding portion of said cavity through said inlet mouth.
- In a provided embodiment, downstream of said Yankee dryer cylinder, a suction device is provided that is connected to the outlet mouth of the fixed hollow shaft. In particular, the suction device is arranged to suck the flow of hot gas that is fed into the cavity of the fixed hollow shaft through the inlet mouth. In this way it is possible to assist the exit of the gas from the dryer cylinder.
- Advantageously, the internal surface of the cylindrical shell provides a plurality of circumferential grooves.
- Preferably, a plurality of distributor members is provided in the internal chamber arranged to distribute the flow of hot air, which comes from said cavity of said fixed hollow shaft, on the internal surface of the shell.
- In particular, each distributor member of the above disclosed plurality is arranged to distribute a share of flow of hot air fed into the cavity of the fixed hollow shaft, on a respective determined portion of the internal surface of the shell.
- More in detail, the distributor members are configured in such a way to define, in the internal chamber, a predetermined path for the hot air between the cavity of the feeding portion and the cavity of the discharging portion.
- In particular, the Yankee cylinder and the fixed hollow shaft are arranged coaxially to each other.
- In an embodiment according to the invention, each distributor member is tubular-shaped, and it is provided with at least one inlet aperture facing towards at least one feeding hole of the lateral surface of the fixed hollow shaft, and at least one distribution aperture facing towards the internal surface of the cylindrical shell.
- Analogously, the feeding aperture can be associated to a feeding panel provided with a plurality of inlet holes. This technical solution, in particular, is adopted in the case in which the feeding panel is arranged in front of a plurality of suction holes.
- According to preferred embodiment, the above disclosed plurality of distributor members is integral to the fixed hollow shaft.
- Advantageously, each distributor member is arranged in front of a predetermined number of suction holes.
- In particular, the feeding portion is provided with a plurality of feeding holes and the discharging portion is provided with a plurality of discharging holes. In this case, both the feeding holes and the discharging holes are advantageously arranged on respective rows.
- In particular, the plurality of feeding holes and the plurality of discharging holes are distributed along all the perimeter of the fixed hollow shaft.
- For example, the rows, along which, the feeding holes, and the discharging holes are distributed can be oriented longitudinally to the fixed hollow shaft.
- Advantageously, each distributor member can be oriented such that the respective feeding aperture is positioned on the respective row of the suction holes.
- Preferably, between the fixed hollow shaft and the Yankee cylinder, at least a first and a second bearing are mounted that are arranged at opposite end portions.
- According to another aspect of the invention, a plant for drying a humid web of paper comprises:
- a Yankee dryer cylinder as above described, said Yankee dryer cylinder being provided with an external surface on which, in use, the humid web to be dried is arranged;
- a drying hood arranged, in use, at the opposite side of said Yankee dryer cylinder with respect to said humid web, said drying hood arranged to cause the drying of said humid web operating in combination with said Yankee dryer cylinder;
- a duct arranged to pneumatically connect said drying hood and said cavity of said fixed hollow shaft, said duct being arranged to feed a flow of hot air circulating within said drying hood, within said cavity.
- Other features of the invention are described in the dependent claims.
- The invention will be now shown with the following description of its exemplary embodiments, exemplifying but not limitative, with reference to the attached drawings in which:
-
Fig. 1 shows a perspective view, partially sectioned, of a Yankee dryer cylinder according to the invention; -
Fig. 2 shows the dryer cylinder offigure 1 according to a longitudinal section; -
Fig. 3A shows an enlargement of a part of the distribution mouth of a distributor member, in order to highlight some details, in particular the distribution panel that is provided; -
Fig. 3B shows an alternative embodiment of the distribution panel offigure 3A ; -
Fig. 4 shows the dryer cylinder, according to the invention, without the heads, in a perspective elevational side view; -
Fig. 5 diagrammatically shows, in a perspective elevational side view, the fixed hollow shaft in running conditions; -
Fig. 6 shows the fixed hollow shaft offigure 5 , sectioned along a longitudinal plane; -
Fig. 7 shows the dryer cylinder, according to the invention, without the heads, in a perspective elevational side view different from that offigure 5 ; -
Fig. 8 diagrammatically shows an enlargement of a distribution panel provided by the invention at the distribution mouth; -
Fig. 9 shows in a perspective view, in longitudinal section, an alternative embodiment of the fixed hollow shaft offigure 6 ; -
Fig. 10 shows a longitudinal view of a first embodiment of the Yankee cylinder equipped with the alternative embodiment of the fixed hollow shaft offigure 9 ; -
Fig. 11 shows a longitudinal view of the alternative embodiment of the Yankee cylinder offigure 10 equipped with the alternative embodiment of the fixed hollow shaft offigure 9 ; -
Fig. 12 shows a perspective view of a further alternative embodiment of the fixed hollow shaft offigure 6 ; -
Fig. 13 shows a cross sectional view of the fixed hollow shaft offigure 12 ; -
Fig. 14 shows in detail an enlargement of a portion ofFig. 13 in order to highlight some features of the invention; -
Figures 15A and 15B show two possible alternative embodiments of a plant for drying a humid web of paper, according to the invention. - As diagrammatically shown in
figure 1 a structure ofYankee dryer cylinder 1, according to the present invention, comprises acylindrical shell 10 having ainternal surface 11. Furthermore, a first and a second heads, or end walls, 71 and 72, are provided that are fixed at the opposite ends of thecylindrical shell 10. This latter is rotatably mounted about a fixedhollow shaft 20 having acavity 21 and a lateral surface 22 provided with a plurality ofholes 25. The fixedhollow shaft 20 is provided, in particular, with aninlet mouth 23, through which a flow ofhot gas 100, preferably a flow of hot air, in particular having a temperature higher than 100 °C, is fed into thecavity 21. The temperature of the hot air is advantageously less than 700 °C in order to avoid to generate too high thermoelastic stresses on the structure ofcylinder 1. - The fixed
hollow shaft 20 is, then, provided with anoutlet mouth 24 provided at the opposite side ofinlet mouth 23. Through theoutlet mouth 24, the flow ofhot air 100, which is introduced through theinlet mouth 23, exits thedryer cylinder 1 after having hit theinternal surface 11 ofshell 10. - According to the invention, into the
cavity 21, apartition wall 35 is provided mounted in such a way to divide the fixedhollow body 20 in afeeding portion 20a, arranged upstream of thepartition wall 35, and in a dischargingportion 20b, arranged downstream of the partition wall 35 (figure 6 ). - The flow of
hot air 100 that is fed into thecavity 21 of the feedingportion 20a, is arranged to pass, through a plurality of feedingholes 25a, into aninternal chamber 30 defined between theinternal surface 11 ofcylindrical shell 10 and the lateral surface 22 of thehollow shaft 20. The flow ofhot air 100 hits, therefore, theinternal surface 11 and, then, enters the dischargingportion 20b ofcavity 21 through a plurality of dischargingholes 25b. These are, in particular, closer to theoutlet mouth 24 than the feedingholes 25a. - In the embodiments shown, for example in the
figures 1 ,2 and6 , thepartition wall 35 is arranged transversely to the fixedhollow shaft 20, in particular, it is substantially orthogonal to thelongitudinal axis 102 of the fixedhollow shaft 20. In this case, therefore, the feedingportion 20a is closer to theinlet mouth 23, and the dischargingportion 20b is closer to theoutlet mouth 24. - In the alternative embodiments shown in the
figures 9 and10 , thepartition wall 35 is, instead, oriented longitudinally to the fixedhollow body 20. In this case, the feedingportion 20a is positioned in the upper part of the fixedhollow shaft 20, while the dischargingportion 20b is arranged in the lowest part. - As shown, for example in
figure 1 , theYankee dryer cylinder 1 provides a plurality ofdistributor members 40 housed within theinternal chamber 30. More in detail, eachdistributor member 40 is adapted to distribute a share of the flow ofhot air 100 coming from the feedingportion 20a ofcavity 21, on a respective determined portion of theinternal surface 11 ofshell 10. - As shown in detail in the
figures 4 and6 , thedistributor members 40 can be oriented radially to theYankee cylinder 10. In particular, eachdistributor member 40 can extend longitudinally to theYankee cylinder 10. - In the alternative embodiment diagrammatically shown, as an example, in the
figures 4 and7 , eachdistributor member 40 is tubular-shaped, for example parallelepiped-shaped. In particular, eachdistributor member 40 can provide at least oneinlet aperture 41 facing towards at least afeeding hole 25a of the feedingportion 20a of fixedhollow shaft 20, and at least onedistribution aperture 42 facing towards theinternal surface 11 of thecylindrical shell 10. - As it is shown in detail in
figure 3A , thedistribution aperture 42 of thedistributor member 40 is advantageously associated to adistribution panel 45 provided with a plurality of distribution holes 46. These can be uniformly distributed on the surface of thedistribution panel 45, in such a way to uniformly distribute the share of the flow ofhot air 100, which is delivered by thedistributor member 40, on a respective portion of theinternal surface 11 ofcylindrical shell 10. In the alternative embodiment shown infigure 3B , the distribution holes 46 of thedistribution panel 45 are frustoconical-shaped. In this way, it is possible to reduce the pressure drop in the holes, and, therefore, to increase the flow of hot air hitting theshell 10. - It is appropriate to specify that, in
figure 3 , theinternal surface 11 ofshell 10 is shown provided with a plurality ofcircumferential grooves 15, only as an example. In fact, according to the present invention, theinternal surface 11 ofshell 10 is not necessarily provided with circumferential grooves. Thedistribution panel 45 can be a distribution plate made of a stiff material. Alternatively, thedistribution panel 45 can be made of a porous material, for example a woven fabric, or a nonwoven fabric, or similar materials, provided of a predetermined level of porosity. In this case, the pores of the material of which the panel is made, act as distribution holes. - As shown, for example in
figure 7 , thedistributor members 40 are arranged at predetermined distance from each other and thedistribution apertures 42 are arranged at a predetermined distance from theinternal surface 11 ofshell 10. More in detail,space 50, which is defined by the lateral surfaces facing each other 43 and 44 of twonext distributor members 40, in use, is passed through by an exiting flow of hot air. In fact, the flow of hot air coming fromcavity 21 of the fixedhollow shaft 20, once distributed by eachdistributor member 40 on a corresponding portion of internal surface of thecylindrical shell 10, is forced to pass into thespace 50, which is arranged downstream of thedistributor member 40, from which it comes from, in particular owing to the rotational motion ofcylindrical shell 10. Once the flow ofhot air 100 has transferred its heat at theinternal surface 11 ofshell 10, it becomes cold and passes through the space, which is present between twonext distributor members 40, going towards the dischargingholes 25b of the fixedhollow shaft 20. The flow ofhot air 100 passes, therefore, from the above describedspace 50, at first, in thecavity 21, through the dischargingholes 25b and, then, outside of the fixedhollow shaft 20, through theoutlet mouth 24. This passage can be caused by a suction device, that is not shown in figure for reasons of simplicity, arranged downstream of theoutlet mouth 24 of the fixedhollow shaft 20. - In the preferred embodiment shown in the figures from 1 to 7, the feeding holes 25a and the discharging
holes 25b are positioned on respective rows longitudinal to the fixedhollow shaft 20. More precisely, as shown in detail in thefigures 5 and6 , the feeding holes 25a and the dischargingholes 25b are positioned on respective staggered longitudinal rows, i.e. arranged on the external surface of the fixedhollow shaft 21, but at different generatrix, in case of cylindrical geometry of theshaft 20, as shown in the figure, or, however, along different directions, but parallel to the axis of theshell 10, in the case in which theshaft 20 has a different geometry, for example a parallelepiped geometry. In particular, each row of dischargingholes 25b is arranged downstream of a respective row of feedingholes 25a with respect to the advancing direction of the flow ofhot air 100 along theinternal surface 11 ofshell 10. This is determined by the rotational direction ofcylindrical shell 10 about its axis of rotation. In this way, therefore, an obligatory path is obtained for the flow ofhot air 100 that is, thus, forced to pass fromcavity 21 of the fixedhollow shaft 20, intodistributor member 40, through thefeeding holes 25a, e, after having hit theinternal surface 11 delcylindrical shell 10, to pass into thespace 50 defined between twonext distributor members 40. - In the embodiments shown in the figures from 9 to 11, the
inlet mouth 23 and theoutlet mouth 24 are arranged at the same side of the fixedhollow body 20. In particular, at the end of the fixedhollow shaft 20 that is opposite to the inlet mouth and to theoutlet mouth 24, a closingwall 26 is provided. In this way, it is possible to simplify the construction. In fact, as shown in thefigures 10 and11 , since there is no further need of using a duct with a great diameter for the exit of hot air fromYankee cylinder 1, it is sufficient ashaft 80 having a small diameter and it is, therefore, possible to use abearing 62 having a small size. - In the
figures 12 and 13 a further alternative embodiment of the fixedhollow shaft 20, provided by the present invention, is shown. In this case, thepartition wall 35 extends longitudinally along the fixedhollow shaft 20, but comprises twoplanar portions portion 20a of the fixedhollow shaft 20 having the feedingholes 25a, is, in this case, set between the twoplanar portions portion 20b provided with the dischargingholes 25b is the portion of the fixedhollow shaft 20 corresponding to a central angle β, in particular the explementary angle of that angle α. In this case, therefore, the flow of hot air is delivered at theportion 13 of theinternal surface 11 ofshell 10 ofYankee dryer cylinder 1. The rotational motion ofshell 10 at high speed, for example 3 rounds per sec, contributes, then, to distribute, substantially uniformly, the flow of hot air on all theinternal surface 11 ofshell 10. Also this embodiment can provide one, or more,distributor members 40 having, or not having, thedistribution plate 45, as above described. As shown in detail in the enlargement offigure 14 , thedistributor members 40 are arranged at a predetermined distance d from theinternal surface 11 ofshell 10. - The hot air fed into the
cavity 21 of the fixedhollow shaft 20, can be obtained, in particular, as exhaust fumes, by a machine for producing electrical energy, or by means of a cogenerator, i.e. by means of a "turbogenerator", or a different machine for producing energy that is arranged in the plant where theYankee dryer cylinder 1, according to the invention, has to be installed, or however in the neighbourhood of the same. If it is necessary to reduce the temperature of the exhaust fumes, normally about 600-700 °C, it is sufficient to cool such exhaust fumes before feeding the same to the fixedhollow shaft 20, for example mixing the exhaust fumes with fresh air. - In this way, it is possible to optimize the plant energy consumptions considerably reducing the running costs.
- In the
figures 15A and 15B , two different embodiments are diagrammatically shown of aplant 200, according to the invention, for drying a humid web ofpaper 160, or similar product. More in detail, theplant 200 comprises aYankee dryer cylinder 1, as above described with reference to thefigures 1 to 11 . TheYankee cylinder 1 is, in particular, provided with anexternal surface 12, on which, in use, thehumid web 160 to be dried is positioned.Plant 200 comprises, furthermore, a dryinghood 150 arranged to work in combination with theYankee cylinder 1 in order to cause the drying of the humid web of paper. Generally, the dryinghood 150 is arranged to suck the humidity, which is produced by contact of the humid paper web with thesurface 12 of theYankee dryer cylinder 1 and to feed a flow of hot air on saidhumid paper web 160. According to the invention,plant 200 provides, furthermore, aduct 180 arranged to pneumatically connect the dryinghood 150 to thecavity 21 of the fixedhollow shaft 20. More precisely, theduct 180 is arranged to feed a flow of hot air, which circulates within the dryinghood 150, into thecavity 21. This particular construction solution allows to optimize the energy consumption, in particular, for producing hot air. - In fact, as known, within the drying
hood 150, which is positioned above theYankee dryer cylinder 1, circulates a high flow of hot air, in part, produced by the evaporation of the humidity caused by the contact of humid web ofpaper 160 with the external surface ofYankee cylinder 1, and, in part, produced within the dryinghood 150 that is provided with at least one burner, in particular a burner powered by methane gas, for producing hot air. The hot air produced within thehood 150 is directed towards thehumid web 160, which slides on the surface of the dryer cylinder, causing the drying of the humidity that is evaporated from thehumid paper web 160. - The drying
hood 150 is, in particular, divided into a "humid"part 151 and a "dry"part 152. The present invention provides both the case in which theduct 180 is connected to the dry part (figure 15A ), and the case in which theduct 180 is connected to the humid part of the hood 150 (figure 15B ). This can be obtained, connecting theduct 180 directly to one of the two parts of thehood 150, as shown in thefigures 15A and 15B , or to a respective discharging duct, this case is not shown in the figures for reasons of simplicity. - More precisely, the temperature of the air circulating within the dry part of the drying hood, is about 600-700°C. In the case in which the available hot air has a temperature that is considered to be too high and, therefore, dangerous, for the possibility to generate high thermal stresses in the structure of the
Yankee cylinder 1, the hot air exiting the dry part can be mixed with cold air, before introducing the same in the fixedhollow shaft 20. - This problem does not exist, instead, when the air is withdrawn from the humid part of the
hood 150. The humid part of the hood is, in particular, passed through by a flow of hot air having a temperature less than the air circulating within the dry part. The temperature of the air circulating within the humid part ofhood 150, in fact, is about 300-400 °C and, therefore, ideal for being fed into thecavity 21 of the fixedhollow shaft 20, without incurring in the above described drawbacks. In addition to the above, the fact of using humid air allows to have, under the same temperature, and because of the presence of humidity, an available thermal power greater than that of the case in which dry hot air is used. - In a further alternative embodiment, that is not shown in the figures, the hot air can be withdrawn both from the
dry part 152 and from thehumid part 151 ofhood 150 and mixing the two flows of hot air, before feeding the hot air into the fixedhollow shaft 20.
Claims (15)
- A Yankee dryer cylinder (1) comprising:- a hollow shaft (20) having a cavity (21) and a lateral surface (22) provided with a plurality of holes (25) arranged to connect said cavity (21) with the external environment, said hollow shaft (20) being provided with:- an inlet mouth (23) through which a flow of hot gas (100) having a predetermined temperature, in particular a temperature higher than 100 °C, is arranged to be fed into said cavity (21);- an outlet mouth (24) through which said flow of hot gas (100) is arranged to exit said dryer cylinder (1);- a cylindrical shell (10) provided with an internal surface (11), an internal chamber (30) being defined between the internal surface (11) of said cylindrical shell (10) and said lateral surface (22) of said hollow shaft (20) ;- a partition wall (35) mounted within said cavity (21) in such a way to divide said fixed hollow shaft (20) in a feeding portion (20a) and in a discharging portion (20b), said feeding portion (20a) being provided with at least one feeding hole (25a) arranged to feed said flow of hot gas (100) from said cavity (21) to said internal chamber (30), in such a way to hit said internal surface (11), said discharging portion (20b) being provided with at least one discharging hole (25b) pneumatically connected to said outlet mouth (24), said flow of hot gas, after having hit said internal surface (11) of said shell (10), being arranged to pass through said, or each, discharging hole (25b), from said internal chamber (30) to said cavity (21), in such a way to flow outside said Yankee dryer cylinder (1) through said outlet mouth (24) ;said Yankee dryer cylinder (1) characterised in that said hollow shaft (20) is a fixed hollow shaft and in that said cylindrical shell (10) is rotatably mounted about said fixed hollow shaft (20).
- Yankee dryer cylinder (1), according to claim 1, wherein a plurality of distributor members (40) is provided that are housed within said internal chamber (30), each distributor member (40) of said plurality being arranged to distribute a share of said flow of hot gas (100), fed into said cavity (21) of said fixed hollow shaft (20), on a respective determined portion of said internal surface (11) of said shell (10).
- Yankee dryer cylinder (1), according to claim 2, wherein each distributor member (40) of said plurality is tubular-shaped and is provided with at least one inlet aperture (41) facing towards at least one feeding hole (25a), and at least one distribution aperture (42) facing towards said internal surface (11) of said cylindrical shell (10).
- Yankee dryer cylinder (1), according to claim 3, wherein said, or each, distribution aperture (42) is associated to a distribution plate (45) provided with a plurality of distribution holes (46), in such a way to uniformly distribute the respective share of flow of hot gas (100) on the respective portion of the internal surface (11) of said cylindrical shell (10).
- Yankee dryer cylinder (1), according to claim 2, wherein said distributor members (40) are arranged at predetermined distance from each other, and said distribution apertures (42) are arranged at a predetermined distance from said internal surface (11) of said shell (10), in such a way that the lateral surfaces facing each other, of two adjacent distributor members (40), are arranged to delimit a space, which, in use, is passed through by a flow of hot exiting gas directed towards said discharging holes (25b).
- Yankee dryer cylinder (1), according to any of the previous claims, wherein said feeding portion (20a) provides a plurality of feeding holes (25a) and said discharging portion provides a plurality of discharging holes (25b), said feeding holes (25a) and said discharging holes (25b) being positioned on said fixed hollow shaft (20) at different longitudinal rows.
- Yankee dryer cylinder (1), according to any of the previous claims, wherein each distributor member (40) of said plurality is oriented radially to said cylindrical shell (10), and extends longitudinally along said Yankee cylinder (1).
- Yankee dryer cylinder (1), according to any of the previous claims, wherein said inlet mouth (23) and said outlet mouth (24) are provided at a same side of said fixed hollow shaft (20).
- Yankee dryer cylinder (1), according to claim 8, wherein, at the end of said fixed hollow shaft (20) opposite to said inlet mouth (23) and to said outlet mouth (24), a closing wall (26) is provided.
- Yankee dryer cylinder (1), according to any of the previous claims, wherein said partition wall (35) is selected from the group consisting of:- a partition wall (35) arranged substantially orthogonal to the longitudinal axis (102) of said fixed hollow shaft (20);- a partition wall (35) arranged longitudinal to said fixed hollow shaft (20);- a partition wall (35), which extends longitudinally along said fixed hollow shaft (20), said partition wall comprising a first portion (35a) and a second portion (35b) inclined by a predetermined angle (α).
- Yankee dryer cylinder (1), according to any of the previous claims, wherein said flow of hot gas is a flow of a mixture of gases.
- Yankee dryer cylinder (1), according to any of the previous claims, wherein said flow of hot gas is a flow of hot air.
- Yankee dryer cylinder (1), according to any of the previous claims, wherein said temperature of said flow of hot gas is set between 250 °C and 700 °C, preferably set between 300 °C and 600 °C.
- Yankee dryer cylinder (1), according to any of the previous claims, wherein a suction device is provided connected to said outlet mouth (24) of said fixed hollow shaft (20), said suction device arranged to suck said flow of hot gas fed into said cavity (21) of said fixed hollow shaft (20) through said inlet mouth (23) .
- A plant (200) for drying a humid web of paper (160) comprising:- a Yankee dryer cylinder (1), according to any claim from 1 to 14, said Yankee dryer cylinder (1) being provided with an external surface (12), on which, in use, said humid web (160) to be dried is laid;- a drying hood (150) arranged, in use, at the opposite side of said Yankee dryer cylinder (1) with respect to said humid web (160), said drying hood (150) arranged to cause the drying of said humid web (160) operating in combination with said Yankee dryer cylinder (1);- a duct (180) arranged to pneumatically connect said drying hood (150) and said cavity (21) of said fixed hollow shaft (20), said duct (180) being arranged to feed a flow of hot gas (100) circulating within said drying hood (150) within said cavity (21).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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PL17707658T PL3405612T3 (en) | 2016-01-22 | 2017-01-10 | Yankee dryer cylinder operating without steam |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITUB2016A000329A ITUB20160329A1 (en) | 2016-01-22 | 2016-01-22 | MONOLUCID DRYING CYLINDER WITHOUT STEAM USE |
PCT/IB2017/050105 WO2017125829A1 (en) | 2016-01-22 | 2017-01-10 | Yankee dryer cylinder operating without steam |
Publications (2)
Publication Number | Publication Date |
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EP3405612A1 EP3405612A1 (en) | 2018-11-28 |
EP3405612B1 true EP3405612B1 (en) | 2020-03-11 |
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EP17707658.5A Active EP3405612B1 (en) | 2016-01-22 | 2017-01-10 | Yankee dryer cylinder operating without steam |
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US (1) | US20190024314A1 (en) |
EP (1) | EP3405612B1 (en) |
JP (1) | JP2019508657A (en) |
CN (1) | CN108603337A (en) |
BR (1) | BR112018014780A2 (en) |
IT (1) | ITUB20160329A1 (en) |
PL (1) | PL3405612T3 (en) |
WO (1) | WO2017125829A1 (en) |
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CN109487614B (en) * | 2018-12-25 | 2023-12-26 | 诸城市大正机械有限公司 | Jet flow plate structure of toilet paper machine and preparation method thereof |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US3633662A (en) * | 1970-01-16 | 1972-01-11 | Beloit Corp | Dryer drum assembly |
FI88630C (en) * | 1992-06-08 | 1993-06-10 | Valmet Paper Machinery Inc | Foerfarande och anordning Foer att effiverivera functionen av ett yankeepressparti i en mjukpappersmaskin |
US6683284B2 (en) * | 2002-03-22 | 2004-01-27 | Metso Paper Karlstad Ab | Thermal roll for papermaking with a fluid circulation system and method therefor |
DE102005000795A1 (en) * | 2005-01-05 | 2006-07-13 | Voith Paper Patent Gmbh | Apparatus and method for producing and / or refining a fibrous web |
CN103334332B (en) * | 2013-06-05 | 2015-06-10 | 杭州大路装备有限公司 | High-efficiency dry cylinder device of high-speed sanitary paper machine system and drying method of high-efficiency dry cylinder device |
CN204455702U (en) * | 2014-12-24 | 2015-07-08 | 佛山市南海区宝拓造纸设备有限公司 | A kind of steel raises a gram drying cylinder |
CN204370234U (en) * | 2014-12-27 | 2015-06-03 | 潍坊凯信机械有限公司 | A kind of cylinder assembly of Flying Dutchman |
-
2016
- 2016-01-22 IT ITUB2016A000329A patent/ITUB20160329A1/en unknown
-
2017
- 2017-01-10 PL PL17707658T patent/PL3405612T3/en unknown
- 2017-01-10 JP JP2018538222A patent/JP2019508657A/en active Pending
- 2017-01-10 US US16/070,709 patent/US20190024314A1/en not_active Abandoned
- 2017-01-10 BR BR112018014780A patent/BR112018014780A2/en not_active Application Discontinuation
- 2017-01-10 CN CN201780006841.5A patent/CN108603337A/en active Pending
- 2017-01-10 EP EP17707658.5A patent/EP3405612B1/en active Active
- 2017-01-10 WO PCT/IB2017/050105 patent/WO2017125829A1/en active Application Filing
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US20190024314A1 (en) | 2019-01-24 |
BR112018014780A2 (en) | 2018-12-11 |
EP3405612A1 (en) | 2018-11-28 |
ITUB20160329A1 (en) | 2017-07-22 |
WO2017125829A1 (en) | 2017-07-27 |
CN108603337A (en) | 2018-09-28 |
JP2019508657A (en) | 2019-03-28 |
PL3405612T3 (en) | 2020-09-21 |
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