EP0815318B2 - Method for dewatering a sheet of cellulose material using hot air caused to flow therethrough by means of a high vacuum, device therefor, and resulting material - Google Patents

Method for dewatering a sheet of cellulose material using hot air caused to flow therethrough by means of a high vacuum, device therefor, and resulting material Download PDF

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Publication number
EP0815318B2
EP0815318B2 EP19960908155 EP96908155A EP0815318B2 EP 0815318 B2 EP0815318 B2 EP 0815318B2 EP 19960908155 EP19960908155 EP 19960908155 EP 96908155 A EP96908155 A EP 96908155A EP 0815318 B2 EP0815318 B2 EP 0815318B2
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EP
European Patent Office
Prior art keywords
air
sheet
approximately
characterized
means
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Application number
EP19960908155
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German (de)
French (fr)
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EP0815318A1 (en
EP0815318B1 (en
Inventor
Paul Marchal
Claude Lesas
Jean Lehervet
Emmanuelle Kientz
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Georgia-Pacific France
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Family has litigation
Priority to FR9503220 priority Critical
Priority to FR9503220A priority patent/FR2732044B1/en
Application filed by Georgia-Pacific France filed Critical Georgia-Pacific France
Priority to PCT/FR1996/000414 priority patent/WO1996029467A1/en
Publication of EP0815318A1 publication Critical patent/EP0815318A1/en
Publication of EP0815318B1 publication Critical patent/EP0815318B1/en
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9477201&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0815318(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
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    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00Dryer section of machines for making continuous webs of paper
    • D21F5/20Waste heat recovery
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00Dryer section of machines for making continuous webs of paper
    • D21F5/18Drying webs by hot air
    • D21F5/182Drying webs by hot air through perforated cylinders

Description

  • The invention relates to the spinning of a sheet of cellulosic material, particularly in the context of the manufacture of cellulose wadding or wadded fabric, ie a relatively low basis weight absorbent paper, generally creped , for sanitary or domestic use: toilet paper, towel, kitchen towel, etc. In particular, it relates to a process for wringing the paper sheet, carried out after the forming step but before the final drying.
  • In conventional papermaking processes, after the sheet forming step and a first drip, mechanical pressing is performed before the sheet is dried. In the case of the manufacture of cellulose wadding or wadded fabric, a known means is to apply and stick with a suitable adhesive the still wet sheet on a cylinder, commonly referred to by the term Yankee, equipped with a hood of drying.
  • There is known a method of drying and drying by blowing hot air through the sheet supported by a permeable fabric itself driven on a permeable support. This is constituted by the porous wall of a rotating drum. A flow of hot air at a pressure slightly above atmospheric pressure is guided from inside the drum to the surface of the sheet, and crosses it. An enclosure, open on the opposite side of the sheet and in slight depression, collects the air saturated with moisture which is evacuated by a suction fan. According to US Pat. No. 3,303,576, a sheet is thus initially introduced at a 20% dryness and a fiber weight of 20 g / m 2 , to a dryness of 50%, by means of a hot air flow at 250.degree. ° C, a flow rate of about 2 to 3 Nm3 / sec.m 2 (30-45lbs / min.ft 2 ) and a pressure in the feed chamber of about 5 to 15 cm of water column at above the ambient pressure. The dryness is raised to 80% with a second through-air dryer. According to the patent, with this device is obtained a uniform drying over the entire width of the sheet without damaging the fibers. The effectiveness of such a drying system results partly from the evaporation due to the contact between the wet fibers entering the dryer and the drying air, and also from the driving effect of the water under its control. liquid form, produced by the flow of air. Subsequently, this type of dryer with one or more cylinders is designated by the expression of the air-through type
  • If evaporative drying is a function of the volume of the air and its dry and wet temperatures, the entrainment of the liquid particles results from its speed. In US Pat. No. 3,447,247, a drying device has been proposed in which the drying air is projected at high speed onto the sheet in the form of a plurality of high speed, low diameter jets. Thus, this air, instead of crossing the fibrous material through only the areas of lower resistance - that is what would happen if the pressure difference was small - is forced through the sheet over its entire surface. This results in a more uniform drying. In addition, the high speed of the jets limits lateral leakage and makes the seals less necessary. Because of the efficiency of such a system, other dryers and / or presses used in combination with the hot air dryers can be eliminated. According to the technique disclosed in this patent, jets of air are produced at a speed of 40 m / s. This speed is much higher than that generated in conventional through-air type dryers. However, it is observed that the depression at the suction box is kept at a low value, 30 cm of water column or less.
  • A mode of air drying at high velocity, up to 100 m / s, and suction on the support fabric is also described in the article "Das Papier"; flight. 29, No. 10a, 1975 Darmstadt, pages V 127-V133; R.H. Crotogino "Weiterentwicklung das Trockenpartie; Prallström-und durchlufttrochknung".
  • Although this type of drying was proposed many years ago, it apparently did not have an industrial outlet, probably because of the difficulty in controlling high energy air jets, disrupting the structure of the structure. sheet of paper and sealing the system.
  • The invention provides a spin at the same time by driving water in the liquid state and by evaporation resulting from the passage of a very large flow of hot air through the wet sheet conveyed by a permeable fabric. The method is characterized in that the flow of air through is generated by a high vacuum, between 100 and 500 millibars and created under the web scrolling through a fixed surface, along with the hot air is brought to the free surface of the sheet. The speed of the air is between 5 and 50 m / s.
  • The purpose of using a relatively high vacuum is to create a flow of air through the porous structure of the sheet at a rate sufficient to viscously draw the free water to the fiber surface and extract it. of the sheet in the form of aerosols. Thus the use of hot air to feed the flow of air through has a dual purpose:
    • Heat the free water on the surface of the fibers by thermal exchange, in order to reduce its viscosity and, consequently, the tensioactive bonding forces with the fibers. This results in a considerable increase in the flow of mechanically extracted water out of the sheet relative to an extraction means without heating the air.
    • Evoke water evaporation by heat exchange with the wet fibers.
  • Compared to the solution of the prior art which is to project hot air jets on the surface of the sheet, it is possible to realize a facility for implementing the process much simpler and more economical. Ways sealing, for example, are reduced to peripheral joints, and it is not necessary to provide at the level of the sheet of paper which would involve arranging the latter between two webs to protect it. The means for guiding the air, formed in the feed box, distribute the flow as evenly as possible to the surface of the sheet, unlike the prior art where it is necessary to concentrate air jets on small areas. Admittedly, in the latter case, the effectiveness of the jets is not influenced by the possible heterogeneity of the distribution of fibers in the sheet, but their action is not uniform over the entire surface. Finally, the vacuum makes it possible to increase the spin potential for a mass of air at the same enthalpy.
  • The method of the invention makes it possible to raise the dryness rate of the wet sheet leaving the forming section from values of the order of 8 to 25% up to values of between 20% and 75%. In the present description, the dryness corresponds to the weight of the absolutely dry fibers compared to that of the wet fibers.
  • The final rate of dryness depends on the residence time of the sheet in the flow of hot air through. This residence time can vary from 1/1000 seconds to 3/10 seconds for given values of the intensity of the flow of through air and its temperature.
  • The final value of the dryness also depends, for a residence time fixed within the above limits, of the initial dryness of the sheet, the geometry of the surface traversed by the air, the flow rate of the air through which can be between 5 and 50 Nm3 / m 2 .s depending on the porosity of the sheet and the vacuum level, and also its dry and wet temperatures.
  • Thus according to another characteristic of the process, the air is at a dry temperature between 100 and 500 ° C.
  • According to another characteristic of the process, the air is humid; and its wet temperature is between 50 and 90 ° C.
  • According to another characteristic of the method, the air circulates in closed circuit, and, after passing through said sheet, it is successively:
    • collected by a recovery box maintained under a depression of 100 to 500 mbar,
    • leads to an air / water separator to eliminate water in suspension,
    • compressed at a pressure slightly above atmospheric pressure,
    • heated to a temperature between 100 ° C and 500 ° C,
    • brought to cross the sheet again.
  • According to another characteristic of the method, a part of the compressed air is evacuated, and a corresponding quantity is introduced into the circuit, in order to maintain the spinning air at a humid temperature of between 50 and 90 ° C.
  • According to another characteristic, the sheet is traversed by at least a second stream of hot air downstream of the first, the wet temperature is different, preferably lower. This splitting in the machine direction of the flow of hot air through makes it possible to optimize the thermodynamic parameters of the airflow as a function of the evolution of the dryness of the sheet. Especially when the dryness exceeds 40%, the amount of moisture in the air can be lower.
  • According to another feature of the invention, in a method of making a sheet of paper, the dryness of the sheet is increased after dewatering to a value of between about 35 and about 75%, preferably about 35 and approximately 50% by the high-vacuum dewatering means of the invention and then the sheet is dried by means of a Yankee type cylinder to a dryness of the order of 95%.
  • According to this method, the mechanical pressing of the sheet, supported by a felt in a conventional machine, is replaced by dewatering according to the invention while setting the latter so as to obtain the same degree of dryness. Thanks to this feature of the process, a sheet of paper having a higher bulk is obtained than in the case of a conventional machine, while maintaining intact the speed performance and therefore the capacity of the machine since the level of dryness of the incoming sheet in yankee is unchanged.
  • According to another characteristic of the invention, in a paper-making plant, after dewatering, the high-vacuum dewatering of the invention is carried out to a dryness of between about 35 and about 75%. conveying fabric being then a canvas of the type "marker". The sheet is then dried on a Yankee type cylinder.
  • By "marker" fabric, it is understood a fabric comprising a weaving structure with zones of high porosity and zones of low porosity disposed according to a geometric definition determined so that it induces in the sheet a heterogeneous structure comprising zones of different compaction by the very effect of the through air dewatering of the invention.
  • The dryness of the sheet, after spinning, is chosen between 35 and 75%, depending on the qualities desired for the bouffant but also for the strength of the sheet. Surprisingly, in the case of the manufacture of high-bulk paper with marker fabric, where the sheet is printed on the fabric, a marking effect is obtained. important that increases the volume of the leaf in the most porous areas, probably because of the high vacuum prevailing under the canvas. It is also surprisingly found that the vacuum has no detrimental effect on the appearance and formation of the sheet which is kept intact while the risk of bursting is a priori high.
  • According to another characteristic of the invention, in a papermaking plant, after dewatering, the high vacuum squeezing of the invention is carried out to a dryness of between approximately 20 and approximately 45%, conveying fabric being then a canvas of the type "marker". The sheet is then dried on the same fabric by means of a prior art through air dryer to a dryness of between about 50 and about 90% and finally by means of a Yankee cylinder with a crepe squeegee to a dryness of the order of 95%.
  • According to another characteristic of the invention, the dryness of the sheet after dewatering is increased from a value of between about 8 and about 30% to a value of between about 20 and about 45%, by said spinning method. , the conveyor belt then being a fabric of the "marking" type and in that then the same fabric is dried by at least one drying device of the air-passing type to a dryness of about 95 %.
  • According to another characteristic of the invention at least a portion of the air supplying the distribution box is extracted from said through air type drying device.
  • According to another characteristic of the invention, at least part of the air supplying the distribution box is extracted from the drying hoods of the Yankee cylinder drying device.
  • According to another characteristic of the process for producing a sheet of paper using a wiper means according to the invention, metered quantities of water vapor are injected into the hot air flow before it passes through. of the sheet, particularly in the first of the spinning zones in the direction of travel of the sheet when the spinning process comprises several zones. This injection is modulated so as to vary the moisture content of the air along the cross-direction of the sheet, the objective being to extract different amounts of water across the sheet. This accurately controls the moisture profile of the sheet after drying and its quality.
  • The invention also relates to a device for carrying out the method. The device is defined in accordance with the features of claim 16. In particular, the device also comprises an air / water separator allowing the air to be switched on by means of a compressor communicating with a heating means.
  • In particular the method allows the realization of a total energy installation. Thus, in this case, the compressor is likely to be driven by a gas turbine group whose exhaust gas is fed to a heat exchanger for heating the air flow from the compressor before its introduction into the distribution box. The compressor may be composed of several compression units, and the group may also consist of several gas turbine units.
  • The subject of the invention is also a sheet of paper, especially a high-bulk paper manufactured according to the high-vacuum squeezing method.
  • Other features and advantages of the method will appear on reading the description of non-limiting embodiments of the invention, with the drawings in which,
    • FIG. 1 represents an installation according to the invention according to a first embodiment with a suction rotary cylinder,
    • FIG. 2 represents a second embodiment with an aspiring fixed box,
    • FIG. 3 represents a third embodiment of the invention, with total energy,
    • FIG. 4 represents a fourth embodiment of the invention, combined high vacuum wiping and conventional through drying,
    • FIGS. 5 to 8 represent graphs summarizing tests carried out on pilot machines,
    • FIG. 9 represents a fifth embodiment of the invention comprising a steam injection forming a moisture profile correction of the sheet.
  • The installation corresponding to the first embodiment for the production of absorbent paper with a basis weight of between 12 and 80 g / m 2 , comprises in its wet part a section for forming the sheet which can be of any type known to man. of career. In the example shown, it comprises a double fabric 11 and 12 between the convergent interval from which a jet of dough is injected from a headbox 13. After draining bringing the sheet to a dryness of 8 to 25%, this last is driven to a means 15 which ensures its transfer to a permeable canvas. This fabric can be simple or "marker" type according to the manufacturing process that is implemented. The wet sheet is conveyed to the dewatering device 16 from which it leaves freed, for the most part, its water. The dryness rate of the sheet is then between 25 and 75%. The fabric then drives it to a drying cylinder 18 provided with drying hoods of the type known as Yankee on which it is applied by means of a suitable adhesive. In its rotation, the sheet passes under the drying hoods and is peeled off by means of a doctor blade so as to crepe it, as is well known.
  • The wiper device 16 consists of a rotating cylinder 19 mounted on a horizontal axis. The surface of the cylinder is porous with a high opening rate. An internal volume space 20, forming a recovery box, is delimited by a fixed cover 21, covering a sector of the cylinder, and the complementary sector thereto. It is in communication via a conduit 22 with a vacuum source. It is also in communication, by the sector of its surface not closed by the cover 21, with one or more boxes 24 of hot air distribution which are arranged outside the cylinder and which have openings in the form of sectors of circle parallel to its wall. These openings are provided with means of equalizing the air flow, such as fins or other equivalent means, so that it approaches the sheet with a uniform speed over the entire surface. The boxes 24 are supplied with hot air by a compressor 26 driven by a motor 27, for example electric. The compressor can be of any suitable type, axial or centrifugal. The air coming from the compressor is heated to the desired temperature by a heating means which in the example shown is a burner 28. The duct 30 connecting the compressor to the burner 28 comprises a bypass 34 provided with a valve 31 controlling the air extraction from the circuit. Furthermore, an opening 33 with variable rate air introduction means 32 makes it possible to compensate the air extracted by the opening 34, and to form a mixture with the residual compressed air, coming from the duct 30, before reheating thereof by the burner 28. The quantities of fresh air and extracted air can be controlled by an appropriate control member according to the humidity rate of the air inside the chambers 24 Similarly a control loop controls the flow of fuel to the burner 28 as a function of the temperature of the air at the distribution boxes 24. The duct 22 is connected to a separating apparatus 23 of the cyclone or other type so that water drops suspended in the air can be removed from the circuit. This separator may be external to the wiper device as shown. However, it is also within the scope of the invention to achieve the separation water / air at the outlet of the air, immediately downstream of the wet sheet of paper, for example by means of baffles, provided with gutters, disposed across the flow in the input area of the enclosure 20. This embodiment is not shown. Water collected in the separator is pumped to atmospheric pressure. The dehumidified air leaving the separator is led to the inlet of the compressor 26 to be compressed again at a pressure slightly above atmospheric pressure, and used for spinning.
  • The dewatering device operates as follows: the wet sheet on the fabric 17 is driven around the cylinder 19 and passes under the hot air outlet nozzles of the caissons 24. The strong depression prevailing in the enclosure, generated by the suction of the compressor 26 and set to a value between 100 and 500 millibars, then forces the flow of air from the boxes to thus pass through the sheet at a high speed. This speed is preferably between 5 and 50 m / s. The water is extracted from the sheet partly by evaporation, partly in the form of aerosols. The separator was disposed at a distance from the well 20 selected so that water suspended in liquid air settles at its level before it evaporates into the air stream. The saturated air, extracted under vacuum from the separator, is compressed by the compressor at a pressure slightly above atmospheric pressure.
  • The temperature of the air at the outlet of the heater is set between 100 ° C. and 500 ° C., and its humid temperature is maintained between 50 ° C. and 90 ° C. by appropriately adjusting the quantity of air extracted from the heating circuit. and that of fresh air brought in 33.
  • The arrangement illustrated by the diagram of Figure 1 is not the only possible. In particular, the suction part of the cylinder and the hot air supply box can be placed in the upper part of the cylinder.
  • In this case, the permeable wiping cloth which is unique between the forming section and the application on the yankee, will describe another trajectory than that illustrated. However this provision does not change the principle of this embodiment.
  • It is also within the scope of the invention to provide several, at least two, closed circuits for the spinning air allowing the spinning of successive zones, each circuit comprising: a distribution box, a recovery box with its suction slot, a compression means and a means for reheating the air reintroduced into the distribution box. The purpose is to allow the adjustment of the thermodynamic conditions of the air, in particular its wet temperature, by adjusting the individual fresh air introduction means to each loop. In the first zone or areas where wringing is essentially carried out by extraction of liquid water, up to 20-35%, provision is made to incorporate an air / water separator between the return boxes and the compressor.
  • In the second embodiment illustrated in the diagram of FIG. 2 (the elements which have not been modified with respect to FIG. 1 bear the same reference), the spinning fabric 17 which can be marking conveys the wet sheet. through a set of two fixed boxes 120 and 124: a sucking suction chamber 120 side spin screen which determines the suction surface through which the leaf is drained, and a box 124 hot air distribution located on the side of the wet sheet.
  • The two boxes are arranged at a short distance from each other. The fabric 17 is guided in the gap thus formed between the two boxes so that the wet sheet is on the side of the box through which the hot air is brought. The fabric is itself supported by rollers 121, for example, or slides on a plate provided with slots. As in the example of FIG. 1, the air is brought to a speed of 5 to 50 m / s because of the depression prevailing in the casing 124, and passes successively through the wet sheet and the porous fabric from which it extracts the desired amount of moisture.
  • Again, the arrangement shown in the diagram of Figure 2 is not the only possible. Thus the two boxes can be reversed, with the recovery box disposed below the spin screen which will then describe another path than that illustrated but without changing the principle of this embodiment. It is noted that the spin web remains unique between the wet part of forming the sheet and the drying part on the drying cylinder.
  • There is shown in Figure 3 an embodiment with total energy. As before, the elements of the installation common to the various embodiments bear the same references. In this installation, the drive of the compressor 26 is provided by a gas turbine unit 126. This comprises, in a manner known per se, a compressor 126 C whose rotor shaft is driven by a turbine 126 T placed in motion by the gases from a combustion chamber itself supplied with combustion air by the compressor. The turbine also drives a shaft connected by a coupling to that of the compressor 26. The gases from the turbine are at a sufficient temperature, of the order of 500 ° C, to serve as a heat source in the present spin device . For this purpose, the means for heating the air coming from the compressor 26 is constituted by a heat exchanger 128. It is connected, on one side, by a duct 127 to the hot gases coming from the turbine 126, and, from the other, through a conduit 130 to the air outlet of the compressor 26. There is provided a conduit 129 bypass of the exchanger for air. Two registers 132 and 133, controlled by an air temperature regulation loop inside the air distribution box 124, control the flow of the air actually passing through the exchanger. An auxiliary burner, not shown, may be arranged in the intake duct of the box 124 downstream of the exchanger 128. The supply of this burner is cascaded with the registers 132, 133 by the same temperature controller.
  • Instead of heating the air coming from the compressor by means of a heat exchanger, it is also within the scope of the invention to provide for the mixing of at least a portion of the exhaust gas of the gas turbine with compressor air.
  • FIG. 4 shows a fourth embodiment of the invention in which the path of the wet sheet is arranged between the high vacuum dewatering device 16 and the Yankee drying cylinder, at least a conventional through air type dryer 140 comprising a cylinder 142 rotatably mounted about a horizontal axis. Its wall is porous and supports the fabric 17. Air heated by a burner 146 is driven through the wet sheet applied to the fabric 17, by means of a circulation fan 144. In the feed circuit air dryer, there is provided a burner as is known.
  • The wet paper sheet is transferred from the forming fabric to the fabric 17, its dryness level is then between 8 and 30% approximately. It undergoes a high-vacuum squeezing through the device 16 of the invention from which it results with a degree of dryness of between 20 and 45%. It then passes into the dryer 140 where it undergoes drying increasing its dryness to a level between 50 and 90%. The sheet is then applied to a Yankee drying cylinder 18 where it is dried to a dryness of the order of 95%. The dried sheet is peeled off the cylinder by means of a crepe squeegee as is known when making a creped product.
  • It should be noted that the diagram of Figure 4 is a block diagram that does not represent all the elements necessary for operation in practice, such as in particular the use of additional systems or conveyor cloths.
  • It is also within the scope of the invention to combine the high-vacuum dewatering of the invention with exclusively conventional through-air drying.
  • Tests were carried out on a pilot machine to highlight the influence of the various parameters on the efficiency of spinning and drying
  • 1 - Influence of the initial dryness.
  • The process was tested on a commercial paper towel sheet, made of cellulose wadding or creped wadding, such as that marketed under the trademark O'KAY. It was moistened by spraying measured quantities of water.
  • The pilot machine comprises a flat support, provided with a vacuum slot, on which moves an air permeable grid. The speed of the gate can be set to a specified setpoint. A heated air nozzle is disposed above the grid at the vacuum gap. The latter communicates with a vacuum source set at 250 mbar.
  • Four series of tests were carried out by varying the initial dryness rate of the sheet. For the 4 series, the temperature of the air coming from the nozzle, and the duration of the drying to which the samples were subjected, were fixed (by regulating the speed of displacement of the grid over the vacuum gap).
  • These values were as follows: number of the test series 1 two 3 4 air temperature (° C) ambient 150 150 150 drying time (sec.) 9/100 4.5 / 100 6/100 9/100
  • For several initial dryness values, the value of the dryness reached by the samples was recorded. These values have been plotted on a graph, figure 5.
  • It is found that, if the air is at room temperature, curve (1), the dryness rate reached does not exceed 45% regardless of the initial dryness. For the same drying time (9/100 sec.), The hot air makes it possible to ensure a dryness between 65 and 75%, curve (4).
  • II - Influence of the drying time.
  • Two new series of tests were performed on tissue paper samples weighing 17.6 g / m 2 and having the same initial rate of dryness. The vacuum source was set at 340 mbar.
  • For the first series (1), the supply air of the nozzle was at ambient conditions (20 ° C and 5 g of steam per kg of dry air)
  • For the second series (2), the air was preheated to 200 ° C and highly humidified. The measured wet temperature was 64 ° C (120 g of steam per kg of dry air).
  • The dryness reached by the samples was measured for increasing values of the drying time to which they were subjected. Figure 6 reproduces the graph obtained. It can be seen that at room temperature, curve (1), it is not possible to exceed 40-45% of dryness, even if the time is long. On the other hand, the hot moist air, curve (2), allows to exceed very quickly this value. It can also be seen that the spin speed is always higher. This is very clearly apparent from the curves (1 ') and (2') respectively, representing logarithmically the spin speed in kg of water extracted per hour and m 2 in relation to the dryness of the sheet.
  • Comparatively, conventional through-air (through-air-type) air-drying with the following characteristics:
    • canvas speed, 760m / min.
    • dry air temperature, 200 ° C
    • cylinder of 3.60m diameter, open on 270 °
    brings the leaf to 65% dryness in 67/100 sec. The drying time of the dryer according to the invention is therefore 7 to 8 times shorter, for a vacuum 5 to 10 times stronger. III - Incidence of the amount of moisture in the air passing through the drying capacity of a very wet leaf.
  • Tests were carried out on a pilot paper machine of small width, comprising a training section with training cloth, a transfer means on a marker-type cloth, an airtraversant drying section which can be bypassed, a drying cylinder Yankee type with a transfer press. For the purposes of these tests, a spinning / drying section, in accordance with the invention, has been placed at the level of the marker fabric. The entire device corresponded schematically to that of FIG.
  • Three series of tests were carried out. The operating parameters were as follows: series 1 series 2 series 3 grammage of the sheet (g / m 2 ) 21 22 22 depression (mbars) 350/400 350/400 350/400 mass flow of air (kg / m 2 s) 19/20 19/20 19/20 dry air temperature (° C) ambient 180/200 180/200 humid temperature of the air (° C) blowing 13 65 70 at the suction 13 52 56
  • The corresponding dryness values of the sheet have been reported in an orthonormal frame for several drying time values. After smoothing the values, we obtain the curves (1), (2), (3) of Figure 7, corresponding to series 1, 2 and 3.
  • It can be seen that the spin speed, corresponding to the slope of the curves, in the zone comprised between 15 and 35% of dryness, where the wringing is carried out essentially by entrainment of liquid water, increases with the amount of steam contained in the air.
  • Expressed in kg of water extracted per hour and m 2 , the average spin speed in the indicated area was series 1 series 2 series 3 spin speed (kg / hr / m 2 ) 3980 6100 7600
  • IV - Impact of the method of the invention on the bulk of the sheet.
  • Tissue paper production tests were carried out on the previous pilot paper machine with marker fabric. For these tests, the products manufactured had substantially all the same basis weight and fiber composition. They were all dried and creped on the yankee to the same dryness, 95%. The dryness at the yankee inlet and the bulk (cm3 / g) of the sheet after creping were measured.
  • First series of tests (1): The spinning device, without heating the air, was used as a conventional vacuum box associated with a marker fabric of a through-air drying installation.
  • Second series of tests (2): The spinning device of the invention alone was used, by adjusting the time and humidity parameters of the air so that the sheet has a dryness at the entry of the Yankee 50 %.
  • Third series of tests (3): The spin of the invention was combined with a vacuum box fed with hot and humid air and conventional through-air drying.
  • In FIG. 8, the value of the bouffant of the sheet obtained for the three series (1, 2, 3) is reported. We obtain three clouds of points corresponding (1), (2) and (3).
  • It is found that a bouffant of between 15 and 17 cm3 / g is obtained by drying the sheet, according to the process of the invention applied alone (2), to a dryness of only 50%. In the conventional through-air blast type process (1), it is necessary to dry up to 60-65%.
  • By combining the two processes (3), there is a significant increase in the bulk of the leaf, between 19 and 21 cm3 / g.
  • Without being bound by any explanation whatsoever, the method of the invention makes it possible to better conform the fibers to the geometry of the marker fabric because the fibers are warmer and therefore more flexible than in a vacuum box of the prior art of which the air is at room temperature. The fibers are further dried more vigorously after being shaped by the high vacuum. Thus, the structure is stabilized earlier with a lower average humidity. The sheet can thus be bonded to the wall of the Yankee drying cylinder with a lower dryness than in the case of conventional through-air drying, obtaining the same swelling.
  • Another embodiment of the invention is described below with reference to FIG. 9. This figure shows the drying part of a paper machine, incorporating a conventional through air dryer 101, with a porous-wall rotary cylinder 102 and the air-blast hoods 103. A wire 104, of the marker type, for example, supports the sheet from the forming section, and is driven through the dryer, around the cylinder. 102.
  • According to the invention, there is arranged upstream of the cylinder 102 a recovery box 105, the suction slot is open on the side of the web 104 opposite the sheet. The box 105 is in communication with a source of high vacuum, between 100 and 500 mbar. Unlike the installations of the prior art, where the slot sucks the ambient air, the present return box is in communication, on the suction side, with a hot air distribution box 106. The dry temperature of the The air is between 100 and 500 ° C. Its humid temperature is between 50 and 90 ° C.
  • According to a new characteristic of the invention, the humidity level of this air is modulated in the cross direction. Indeed, as has been shown above, the efficiency of the water spinning liquid form of the sheet by the device is even higher than the moisture content carried by the air flow hot through is higher.
    This property is used to modulate the residual moisture profile of the sheet in the cross direction.
  • For this purpose, the well 106 has been divided into a large number of smaller, adjacent chambers 106 'by means of partition walls disposed across the well 106 at regular intervals. Inside each box 106 ', a ramp 107 for steam injection, preferably superheated, has been placed. Each ramp is supplied with steam from a manifold via a valve 107 'whose opening is controlled according to the set value depending on the desired dryness for the corresponding area of the sheet. By measuring the dryness of the sheet for each of these zones downstream of the dryer, or downstream of the Yankee cylinder that follows the dryer, and correspondingly controlling each of the valves 107 ', it is thus possible to correct the dryness profile of the sheet. at the outlet of the dryer or at the outlet of the Yankee cylinder which follows the dryer.

Claims (22)

  1. Process for dewatering a sheet of cellulose material, in particular a wet sheet of paper with a grammage in the dry state of between 10 and 80 g/m2 and having initially a degree of dryness of between approximately 8 % and approximately 30 % for example after drainage on the forming web (12), consisting of supporting the said sheet on a permeable web (17, 104) and of causing it to be traversed by at least one flow of high velocity hot air, characterized in that the air flow has a velocity of between 5 and 50 m/s and is produced by a reduced pressure of 100 to 500 mbars created under the sheet.
  2. Process according to claim 1, characterized in that the air is at a dry temperature of between 100°C and 500°C.
  3. Process according to either claim 1 or 2, characterized in that the air is at a wet temperature of between 50°C and 90°C.
  4. Process according to claim 1, characterized in that the said air flow circulates in a closed circuit and, after having passed through the said sheet, is successively:
    - collected by a take-up box (20, 120, 105) maintained under a reduced pressure of 100 to 500 mbars,
    - led to an air/water separator (23) so as to remove water in suspension,
    - compressed to a pressure slightly above atmospheric pressure,
    - reheated to a temperature of between 100°C and 500°C,
    - guided towards the surface of the sheet, supported by the moving permeable web (17, 104), which it traverses.
  5. Process according to the preceding claim, characterized in that part of the compressed air is evacuated outwards, and a corresponding quantity is introduced into the circuit so as to maintain the air entering the said box at a wet temperature of between 50 and 90°C.
  6. Dewatering process according to one of the preceding claims, characterized in that the sheet is traversed by at least one second hot air flow downstream from the first, of which the wet temperature is different, preferably lower.
  7. Process according to claim 6, characterized in that the two air flows form part of two distinct closed circuits, each of the circuits including steps in the process according to claim 4 and at least the first circuit including air/water separation means.
  8. Process for manufacturing a sheet of paper implementing a high vacuum dewatering process according to claims 1 to 7, characterized in that it increases the dryness of the sheet after drainage from a value of between approximately 8 and approximately 30 % to a value of between approximately 35 and approximately 75 %, preferably between approximately 35 and approximately 50 %, by the said high vacuum dewatering method and in that the sheet is then dried by means of a cylinder of the Yankee type (18) to a dryness of the order of 95 %.
  9. Process for manufacturing a sheet of paper implementing a dewatering method according to one of claims 1 to 7, characterized in that it increases the dryness of the sheet after drainage from a value of between approximately 8 and approximately 30 % to a value of between approximately 35 and approximately 75 %, by means of the said dewatering method, the conveying web (17) then being of the "marker" type, and in that the sheet is then dried by means of a cylinder of the Yankee type (18) to a dryness of the order of 95 %.
  10. Process for manufacturing a sheet of paper implementing a dewatering method according to one of claims 1 to 7, characterized in that it increases the dryness of the sheet after drainage from a value of between approximately 8 and approximately 30 % to a value of between 20 and approximately 45 %, by means of the said dewatering method, the conveying web (17, 104) then being a web of the "marker" type, and in that this same sheet is then dried by a least one drying device of the through-air type (140, 101) to a dryness of between approximately 50 and approximately 90 %, and finally on a Yankee cylinder (18) associated with a creping doctor to a dryness of the order of 95 %.
  11. Process for manufacturing a sheet of paper implementing a dewatering method according to claims 1 to 7, characterized in that it increases the dryness of the sheet after drainage from a value of between approximately 8 and approximately 30 % to a value of between 20 and approximately 45 %, by means of the said dewatering method, the conveying web (17, 104) then being a web of the "marker" type, and in that this same sheet is then dried by a least one drying device of the through-air type (140, 101) to a dryness of 95 %.
  12. Process for manufacturing a sheet of paper according to claim 10 or 11, characterized in that at least part of the air supplying the distribution box is extracted from the said drying device of the through-air type (140, 101).
  13. Process for manufacturing a sheet of paper according to one of claims 8 to 10, characterized in that at least part of the air supplying the distribution box is extracted by the drying hoods of the Yankee cylinder drying device (18).
  14. Process for manufacturing a sheet of paper employing a drying means according to one of claims 1 to 13, characterized in that metered quantities of steam are injected into the hot air flow before it passes through the sheet, modulated in particular in the cross direction of the sheet in order to vary the humidity of the hot air flow before it passes through the sheet.
  15. Process according to claims 7 and 14, characterized in that steam is injected into the first flow.
  16. Device for dewatering a wet sheet of cellulose material with a grammage in the dry state of between 10 and 80 g/m2 and having initially a degree of dryness of between approximately 8 % and approximately 30 % characterized in that it comprises:
    - a moving permeable web (17, 104) with a face for supporting a sheet to be dewatered,
    - an air distribution box (24, 124, 106) with an air inlet conduit and a distribution opening turned towards the said face,
    - means (28, 128) for heating the air admitted into the air inlet conduit,
    - a box (20, 120, 105) for taking up the air coming from the distribution box, positioned on the side opposite the said face, with at least one suction slit facing the distribution opening of the distribution box,
    - means for maintaining the take-up box (20, 120, 105) at a reduced pressure of 100 to 500 mbar so as to produce a flow of air between the air distribution box and the take-up box at a velocity of between 5 and 50 m/s when said sheet is supported by said permeable web (17, 104).
  17. Device according to the preceding claim characterized in that it additionally includes :
    - an air/water separator (23) communicating with the take-up box,
    - an air compressor (26) communicating with the air/water separator,
    - means (28) for heating the air communicating with the compressor (26),
    - a conduit putting the means of heating into communication with the distribution box,
    - means for evacuating air (34) communicating with the compressor,
    - means for introducing air (33) communicating with the heating means.
  18. Device according to the preceding claim, characterized in that it includes a gas turbine unit (126), driving the said compressor (26), and in that the said heating means is supplied with the exhaust gases from the said unit.
  19. Device according to claim 17, characterized in that it includes a gas turbine unit driving the said compressor, and in that the heating means consists of a heat exchanger (128) in communication with the exhaust gases of the said unit on the one hand and on the other hand with the flow of air coming from the said compressor.
  20. Device according to one of claims 16 to 19, characterized in that it includes at least two circuits for dewatering air with distribution boxes for successive zones, at least the first circuit supplying the first zone having an air/water separator.
  21. Device according to one of claims 16 to 20, characterized in that it includes means (107) for injecting steam positioned inside at least the first of the distribution boxes.
  22. Device according to the preceding claim, characterized in that the distribution box (106) is divided up into a plurality of boxes (106) positioned in the cross direction with respect to the machine direction, at least one of the compartments including means for injecting steam.
EP19960908155 1995-03-20 1996-03-20 Method for dewatering a sheet of cellulose material using hot air caused to flow therethrough by means of a high vacuum, device therefor, and resulting material EP0815318B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR9503220 1995-03-20
FR9503220A FR2732044B1 (en) 1995-03-20 1995-03-20 Method for dewatering a cellulosic sheet material by hot air through a high vacuum
PCT/FR1996/000414 WO1996029467A1 (en) 1995-03-20 1996-03-20 Method for dewatering a sheet of cellulose material using hot air caused to flow therethrough by means of a high vacuum, device therefor, and resulting material

Publications (3)

Publication Number Publication Date
EP0815318A1 EP0815318A1 (en) 1998-01-07
EP0815318B1 EP0815318B1 (en) 2001-11-28
EP0815318B2 true EP0815318B2 (en) 2006-12-20

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EP19960908155 EP0815318B2 (en) 1995-03-20 1996-03-20 Method for dewatering a sheet of cellulose material using hot air caused to flow therethrough by means of a high vacuum, device therefor, and resulting material

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Country Link
US (1) US5974691A (en)
EP (1) EP0815318B2 (en)
JP (1) JP4008026B2 (en)
AT (1) AT209725T (en)
BR (1) BR9607865A (en)
CA (1) CA2202172C (en)
DE (2) DE69617406T3 (en)
EA (1) EA000216B1 (en)
ES (1) ES2168465T5 (en)
FR (1) FR2732044B1 (en)
PT (1) PT815318E (en)
WO (1) WO1996029467A1 (en)

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FI110622B (en) * 1998-04-30 2003-02-28 Metso Paper Inc A method and apparatus for improving the drying capacity of a blanket of a Yankee cylinder
EP1092060B1 (en) * 1998-07-01 2003-08-20 Institute of Paper Science and Technology, Inc. Process for removing water from fibrous web using oscillatory flow-reversing impingement gas
US6631566B2 (en) * 2000-09-18 2003-10-14 Kimberly-Clark Worldwide, Inc. Method of drying a web
FR2825418B1 (en) * 2001-05-31 2004-07-16 Oreal Membrane pump and container thus equipped
US6551461B2 (en) * 2001-07-30 2003-04-22 Kimberly-Clark Worldwide, Inc. Process for making throughdried tissue using exhaust gas recovery
US6732452B2 (en) 2001-12-21 2004-05-11 Kimberly-Clark Worldwide, Inc. Apparatus and process for throughair drying of a paper web
US6869506B2 (en) * 2002-11-22 2005-03-22 Metso Paper Karlstad Aktiebolag (Ab) Apparatus for dewatering a paper web and associated system and method
AT412484B (en) * 2003-04-29 2005-03-25 Andritz Ag Maschf Device for drying a paper track
US6904700B2 (en) * 2003-09-12 2005-06-14 Kimberly-Clark Worldwide, Inc. Apparatus for drying a tissue web
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US6910283B1 (en) * 2003-12-19 2005-06-28 Kimberly-Clark Worldwide, Inc. Method and system for heat recovery in a throughdrying tissue making process
US6953516B2 (en) * 2004-01-16 2005-10-11 Kimberly-Clark Worldwide, Inc. Process for making throughdried tissue by profiling exhaust gas recovery
US7861437B2 (en) * 2006-02-27 2011-01-04 Metso Paper Usa, Inc. System and method for mixing distinct air streams
US7716850B2 (en) 2006-05-03 2010-05-18 Georgia-Pacific Consumer Products Lp Energy-efficient yankee dryer hood system
DE102006062234A1 (en) * 2006-12-22 2008-06-26 Voith Patent Gmbh Method and device for drying a fibrous web
DE102007006960A1 (en) * 2007-02-13 2008-08-14 Voith Patent Gmbh Device for drying a fibrous web
US7803248B2 (en) * 2007-05-23 2010-09-28 Johns Manville Method of drying mat products
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CN103243606A (en) * 2013-04-07 2013-08-14 苏州市建诚装饰材料有限公司 Automatic variable-temperature blast drying oven
US8801902B1 (en) * 2013-09-18 2014-08-12 Usg Interiors, Llc Water reduction by modulating vacuum
JP5728556B2 (en) * 2013-10-18 2015-06-03 ユニ・チャーム株式会社 Non-woven bulk recovery device
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Also Published As

Publication number Publication date
FR2732044B1 (en) 1997-04-30
ES2168465T5 (en) 2007-07-01
EP0815318B1 (en) 2001-11-28
CA2202172C (en) 2008-08-26
FR2732044A1 (en) 1996-09-27
EA000216B1 (en) 1998-12-24
JPH11502270A (en) 1999-02-23
US5974691A (en) 1999-11-02
WO1996029467A1 (en) 1996-09-26
DE69617406D1 (en) 2002-01-10
AT209725T (en) 2001-12-15
DE69617406T3 (en) 2007-06-14
EA199700163A1 (en) 1998-02-26
JP4008026B2 (en) 2007-11-14
DE69617406T2 (en) 2002-04-04
EP0815318A1 (en) 1998-01-07
BR9607865A (en) 1998-06-30
PT815318E (en) 2002-05-31
ES2168465T3 (en) 2002-06-16
CA2202172A1 (en) 1996-09-26

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