Method and apparatus for controlling the shrinkage of a fibre web

Technical Field

Below this invention relates to in the preamble of the independent claim of the method and apparatus of the part. The invention in particular relates to control of a fiber web (paper or board web, for example,) the novel way the contraction.

Background Art

The cadres in papermaking locomotive (dry   end), the relative humidity of the air is usually low. This is due to the in-between of the locomotive there are many heat source, but rarely of any water source. In papermaking locomotive in between, in the air often the moisture content of the moisture content of the outdoor air in almost the same. In particular in the winter, cadre [...] the relative humidity of the air is very low, or even to 20%. In connection with the balance of fiber web to be cut, air humidity should be approximately 50%, this depends on the residual moisture content of the fiber web.

More dry than the balance of the moisture content of air drying a fiber web, and as a result thereof in particular in the transverse direction of the fiber web shrinks. When handling fibrous web comes from the roller this problem is particularly outstanding. When the fibrous web in the roller maintained moist, but when the unwinding time, the fibrous web to begin drying and at the same time shrinking. Such shrinkage can cause a roller or other during the idle time of a fiber web. For example, the cutter blade can be a fiber web (slitter   knife) with the adhesive (splicing) or other deceleration or stop being torn in association.

In addition to other outside, of the locomotive have been proposed between the paper the cadres humidifying as the solution. However, this option usually requires a large amount of air and water, and may thus consume a large amount of energy. Through only the paper-making locomotive between the limited space of the humidifying air, has also can solve this problem. Traditionally, humidifying is continuous, even if the stop of cutting rewinding machine, for example, typically only maintains a few minutes per hour. Humidifying (especially continuous humidification) consume a large amount of energy.

In the open literature FI   89952 in the programme, through to the necessary local such as cutter blade waftage the area of the moisture, to locally increase the air humidity.

In the open literature FI   108633 proposed solution, to the slitter rewinder the region of the blade under blowing moisture.

Content of the invention

A purpose of this invention is to reduce, or even eliminate, in the prior art of the above-mentioned problem.

A purpose of this invention is to provide a scheme, using the programme to control the operation of the paper web, such as, for example, associated with the shrink of the fiber web.

A purpose of this invention is to provide a scheme, basically controlled by means of the contraction of the fiber web.

Another object of the invention is to provide a scheme, the programmes to reduce cutting of rewinder reverse winding machine (unwinder) located in every part of the after, for example a paper web, such as the tearing of the fiber web.

Another purpose of this invention is to provide a kind of scheme, the programmes to reduce (join) through bonding and bonding together two sheets of fiber web on the difference between the contraction of the.

In a device for the control of a fiber web according to the present invention in a typical method, the transmission speed to 1st transmitting fiber web, the fiber web and at least one operation is performed on, during the operation, in order to lower than 2nd 1st speed of conveying a fiber web speed operation; or in the fibrous web during this operation or even completely stop, in the implementation of the operation and in a controlled manner before the drying of a fiber web.

For controlling the contraction of the fiber web according to the present invention and typical device includes an operation unit is set up in the fibrous web in close neighbor area (immediate   vicinity) is used in the drying device for drying a fiber web, the drying device along the direction of travel of the fiber web is before the operating unit.

In the paper machine used for transformation of the existing cutting rewinding machine or re-roll paper windings according to the invention in the typical method, cutting rewinding machine or re-roll paper windings including a fiber web by humidifying to reduce the contraction of the humidifying system, the humidifying system to operate is changed into a drying system, the drying system to the fiber web blowing in order to make the drying of a fiber web.

It has been found that, in the operation of a fiber web (the operating requirements of the fiber web substantially reducing or even stop) before, to make in a controlled manner the drying of a fiber web, can be during the operation and control of a web to minimize shrinkage of the web. By means of this invention, can be dried to a fiber web will not be in operation the moisture content in the fibrous web during controlled shrink, this also avoids the defects may be related to contraction of the web, such as material along longitudinal tearing. By means of the invention, in the paper making machine, the fiber web can be the implementation of many of the operation and the operation stage, such as the splitting rewinding machine cutting of the fiber web, or the web bonding of the holes in the fiber web, such as repairing carried out more easily.

In the present application, the term "fibrous web" mean of the fiber containing plant source (such as wood fiber or cellulose fiber) of continuous web, the web is the production of a paper or board machine. The fibrous web may be, for example, a paper or board web. Usually the web can include a paper or paperboard is typically used in manufacturing of other material such as pigment and filler.

In the present application, the term "operating" means, in particular, that the finishing treatment in the (finishing   treatment), cadre of a paper machine in the processing of a fiber web; wherein the making the paper-making machine and the machine has been the production of roll (  roll machine) or other roller along the fiber web of the running direction of the fiber web unwinding, winding, cutting, bonding, or to repair the hole in the web.

In the present invention in one embodiment, the operating means, in particular with the fiber web in the cutting of the operation of the associated, the fiber web to the conveyance speed of the web to slow down or stop. In many fiber web is cut different stages of processing. From the edge of the fiber web can be of the so-called paper is removed, in order to finish the edge of the web. Paper cutting of the paper machine may, for example, the implementation or cutting the rewinding machine. Because the bonding, the client machine roll or another roller processing interrupt (disruption), the transmission speed of the fiber web may have to slow down, or the fibrous web may have to completely stop. For example in order to remove the defect, the fibrous web may also have to be transverse to the cutting. In this case, stop a fiber web, the fiber web by cutting to remove defective section when avalanch multiplication happens, the defect-free and the end of the fiber web are bonded together, thereafter continue to convey the fibrous web.

In the present invention in another embodiment, the operating means, in particular, that the paper machine the repair or bonded fiber web; wherein the fibrous web machine roll unwinding in order to check its quality, hereafter again the rollback cheng Gun fiber web. When the quality of the fiber web holes in the defect, for example, can utilize the appropriate hole repairing sticker (  label   patch hole) permanently or temporarily repairing, or may mark defect in order to to be subsequently removed. In the repair or the mark period, the transmission speed of the fiber web may have to slow down or fiber web may have to completely stop.

In the present application, the meaning of the rewinder cut cutting the fiber web is used for the device, the device can utilize the one or more blades, substantially along the direction of travel of the fiber web, the fiber web for divided into two parts or more parts. Usually, in the splitting rewinder, of the machine roll extra wide material is unwinding, and in slitting department is cut into several more narrow local web, these more narrow part of a reel-up the web is then rolled into a single customer roller. When the customer roller is completed, cutting rewinding machine stop, and the roller is removed from the web client. When depletion of giving the fiber web, cutting rewinding machine stop, and replaced with a new change, the new change of the depletion before the end part of the fiber web of bonded to the end of the.

In the present application, the machine direction or fiber web mean of the direction of travel of the fibrous web in the normal running condition the direction of advancing. On the other hand, the paper lateral or transverse (cross   machine   direction) relative to the machine direction is horizontal, parallel to the direction of the horizontal plane of the fiber web.

According to one embodiment of the present invention, the fibrous web is a fiber web close neighbor area of the drying device for drying. Drying device can be aimed at or suitable for use in any device for the drying of a fiber web. In particular, a fiber web through the set up in the fibrous web to the drying device for close neighbor area fiber a material blows air or blowing heating air, by making its contact such as cylinder or roller and so on for drying the hot surfaces, and/or by the IR radiation or microwave, such as, for example, the electromagnetic radiation is directed to the fiber web to dry.

According to one embodiment of the present invention, by the fiber web through the air-drying of the fiber web is dried by blowing air. Advantageously, for example can be by 0.05-1 (m³/s) per-machine width m, typically 0.22-0.66 (m³/s) per-machine width m, more typically 0.1-0.3 (m³/s) per-machine width m of flow, all of the air blowing on the width of the web. Can also be in the 0.11-0.2 (m³/s) per-machine width of the air blowing in the range of meters. When the blown drying air, nozzle air rate may be, for example, a 10-100m/s, typically 20-70m/s, more typically 25-55m/s, usually 30-45m/s. In various fiber web speed, for example, the transmission speed of the standard of a fiber web, the climbing speed (crawling   speed) or in the fibrous web is stationary, can utilize the air drying. Air drying is a technique known per se, in the present application do not indicate all the details of the air-drying.

In the present invention in those embodiment, a fiber web by blowing to make its drying, blown air can be unheated air or heating air. The temperature of the air not heated typically in the 50 [...] the following, the more typically the 20-35 [...]. Plant air to be used as the heated air. The temperature of the heated air, which may for example be the 30-200 [...] , the 75-150 [...] , 100-150 the or [...] the 77 [...] , the 100 [...] , the 150 or [...] the 170 [...]. Heated air may, for example, by including, for example, filter, blower and a heating unit of the air-conditioning device for generating. The heating unit may include a resistor, steam radiator, water radiator, gas burner or other corresponding to the fiber web to be blown to the air heated to the desired temperature of the heating device. The air from the air-conditioning device for a particulate or channel is oriented to enter the air dryer.

Drying device can comprises an air dryer, air dryer is set to preferably the overall width of the fiber web to a fiber web on the air blowing. In one embodiment, the air dryer can include a gap of the width of the fiber web, air blown to the fiber web from the gap. Preferably, air dryer is provided with a nozzle member, spray nozzle level (nozzle   level), for example, the spray nozzle or nozzle group or circuit, the whole of the length thereof the same as width of the fiber web, and are mainly parallel with the fiber web, the fiber web through the nozzle member are arranged in rows. The nozzle component can include several air blowing opening or interval, from blowing opening or gap into the air is blown to the fibrous web. The direction of travel of the web along the fiber may have a connected with one of a plurality of the nozzle component. In these nozzle member may be provided between the fiber spray nozzle level used for removing the moisture between the outlet of the web. This kind of nozzle member to reliably and effectively drying a fiber web.

In one embodiment of the present invention in, use of one or a plurality of spray nozzles of the total width of the fiber web to a fiber web on blowing the air to be dried. Air dryer of a nozzle member may be, for example, a per se known impact nozzle (  nozzle impulse), suspension type nozzle (  nozzle suspension) or intermittent spray nozzle (  nozzle gap). These nozzle component can be arranged to be close to the fiber web to be dried. Typically, when the nozzle member in close proximity to the web, the nozzle component distance is the distance between the fiber web 0.005-0.02m or 0.01-0.05m, or when the nozzle member is relatively far away from the web when the position of the, nozzle member the distance of the fiber web is from 0.1-0.5m or 0.5-1m or 1-2m. The distance depends on the type of the nozzle member, and the free space in the vicinity of the fiber web. For example, channel-type nozzle (  nozzle channel) distance can be up to the distance between the fiber web 2m, thus they play the role of the air distribution device. When using gas floating nozzle when the (air flotation   nozzle), or they may be a fiber web is arranged to be very close to, in order to maximize the drying effect and energy-saving. Air-floating nozzle the typical distance from the fiber web 5-30mm, more typically 5-15mm. Direct impingement nozzle (direct   impingement   nozzle) the typical distance from the fiber web 15-100mm, more typically 20-50mm.

According to one embodiment of the present invention, using air drying in the blowing nozzle is located on the edge of the fiber web, whereby the air blowing nozzles are arranged along a different fiber web in the direction of the direction of travel of (for example, transverse along paper machine), from the fiber web to the center of the edge of the air blowing. Blowing nozzle can also be located above a fiber web, whereby the air is blown to the upper surface of the fibrous web; or is located under a fiber web, whereby the air is blown to the lower surface of the fibrous web. There can be several nozzle, and their relative to the fiber web can be located in different positions. At the same time the air can, for example, from only one side or of a fiber web is blown from both sides. With respect to the fiber web located in different position of the nozzle member can be similar or different to each other. For example, on the structure and/or blowing effect is concerned, is located on the side of the fiber web of the nozzle member 1st and 2nd is located on the side of the fiber web of different nozzle member. Of the total width of the fiber web in the fiber web or only on a part of the air blowing on the width of the. Air to the surface of the fiber web is blown vertically. Air can move along the diagonal waftage the running direction of the web, can be substantially along the running direction of the web and the web is blown or along the direction opposite to the running direction of the blow. The present invention therefore can make optimization of drying a fiber web, the fiber web is possible to control the shrinkage.

In one embodiment of the present invention in, can be cut has already existed in the rewinder departmentblows dry air humidifying system is changed into the system. Therefore, the air can be blown to the fiber web through the same pipeline and is introduced to in rewinder department (before the introduction of moisture through these pipeline). Already exist before the humidifying air nozzle can be used as a nozzle, or can be used, for example, blowing nozzle such as the substitute component. This kind of alteration work rapid and cheap to implement. When the heated air is used for drying a fiber web, the humidifying system in humidifying air unit into the air-heating unit.

According to one embodiment of the present invention, the drying device may include a hot surface, such as a heatable cylinder (cylinder) or roll (roll), the fibrous web is arranged to travel via the heat surface. Therefore, through the heat contact with the surface of the fibrous web to the drying of a fiber web. A fiber web to be set in contact with the temperature of the hot surfaces, which may for example be the 30-300 [...] , typically the 100-150 [...] , for more typically the 50-100 [...] , in some cases for the 60-120 [...]. Hot surface may be, for example, has become a part of a paper machine or board machine associated with it and is provided with a heating device for the surface of a cylinder or roller.

The device of the drying device can also include a source of electromagnetic radiation, such as infrared ray dryer or microwave dryer, the radiation produced by the electromagnetic radiation source is provided by a predetermined to the fiber web. According to one embodiment of the present invention, the electromagnetic radiation can be directed to the fibrous web on the drying of a fiber web, electromagnetic radiation such as infrared radiation, IR radiation, or microwave radiation. In this specification of the "IR radiation" mean wavelength in the range of 700 nanometer to 1 mm of the radiation. In this specification of the "microwave" mean wavelength in the range of 1 mm to 1m radiation.

If necessary, the drying device can be used for paper machine or board machine has become a certain finishing unit of a portion of the device, or drying device can be with one or more finishing unit is associated. Different drying method and a drying device can be combined with each other, such as creeping and heated air can be blown or IR radiation combined, or single finishing unit can be provided with a radiation source and air dryer.

The drying device can be only short-term operation when required, such as the cessation of the fibrous web before and/or during the fiber a material sticks connected. Drying can also be continuous.

In accordance with one embodiment of the present invention is a method of, when the transmission speed to 1st at the time of conveying a fiber web, began to use drying device to dry the fibrous web. Therefore, before the speed slows down, the drying device have been used for drying a fiber web. Therefore, the drying time can be adjusted to fit each situation. The running speed of the web is slowed down to operating speed before or in the web before a stop of the completely, drying device for example can run 0-100s, 0-30s, 10-40s or 50-100s.

Sometimes, before the implementation of the operation, the speed of the fiber web through the slowing down to creeping speed the drying of a fiber web, the fiber web crawling speed than the transfer speed is low, and the transmission speed of the fiber web as high as or higher than the transmission speed of the fiber web. For example, in standard of the transmission speed of a fiber web to the drying of a fiber web, then, for example, before the stop, crawling speed is slowed down to the speed. In use of the drying apparatus for drying a fiber web by means of a fiber web under the condition of forward creeping speed, the duration of the drying may be sufficient to achieve proper moisture content in the web. In the present application, the standard transmission speed of the web the meaning of the processing at the time of normal operation is that when the running speed of the fiber web. The fibrous web in the cutting speed is, for example standard transport the rewinding machine 2000-3500m/min or 2500-3000m/min. Usually, the typical transmission speed fiber web> 500m/min, is very typical 1500-2500m/min.

According to one embodiment of the present invention, when the in order to is lower than the standard operating speed of the speed to convey the fibrous web, to the drying of a fiber web. Therefore, not necessary to use drying device for active drying of a fiber web, the fiber web, however, the factory with the surrounding drying air for drying the time of contact. Therefore can be simply by the speed of the speed is lower than the standard operation (that is, the so-called creeping speed) to convey the fibrous web, to make the fiber material in dry. In the operation speed is lower than the standard running speed, can get more long drying time, even in a fiber web from this short distance is a greater degree of drying time. The typical crawl speed fiber web <100m/min, typically <50m/min, typically 0.5-17m/min, more typically 0.5-15m/min, very typically <10m/min, such as 1-10m/min, to occasionally 2-5m/min. In association with the bonding, for example can be the crawl speed 30-45m/min, typically about to 40m/min. In the drying of a fiber web at the same time transmitting the crawl speed, such as 0-200s, 0-30s, 10-40s or 50-100s. In the crawling speed at the same time transmission of a fiber web, the fiber web is dried by the drying device.

In this invention a favorable embodiment, is performed on the fibrous web with cutting the operation is to carry out the rewinding machine connection , therefore, when the stop or when the deceleration a fiber web, which remain in the cutting rewinder that in the vicinity of the part of the fiber web is dried. The operation unit is thus cutting rewinding machine, and the drying device is arranged in the vicinity of the cutter blade. A fiber web through the stop or deceleration of the cutter blade on the left that part of the drying of a fiber web, can make the cutter module to minimize contraction of the fibrous web. When the cutter blade of the shrinkage reduction, may be formed in the cutting position due to the contraction and gap and reduce the lateral movement of the. Furthermore, caused by shrinkage of the cutter blade to reduce the risk of tearing of the paper. For example the holes during bonding or repairing, for example when giving or intermediate rolls (  roll intermediate) is exhausted, the fibrous web may have to stop.

According to one embodiment of the present invention, during the operation period before the stop of a fiber web, the drying of a fiber web is not continuous. The drying of a fiber web can be, for example, before a stop of the fiber web is not continuous. Because the fiber web before the stop has been so drying, therefore, the fibrous web during operation of the contraction ratio is low.

According to one embodiment of the present invention, when the fibrous web is stationary, continuous drying of a fiber web. The drying of a fiber web may, for example, in the standard transmission speed, then in a certain period of time and drying a fiber web in the crawl speed transmission. For example, when the fibrous web has stopped in order to adhere to, the drying of drying fiber web may be discontinuous. The may, for example, according to the following way for drying a fiber web: in the finishing stage of operation before the possibility of, along the conveying direction of the fiber web to begin drying.

According to one embodiment of the present invention, the fiber web or stop after running at a relatively low speed, when the fibrous web has been accelerated to the standard transport-speed, continuous drying of a fiber web. In some embodiments, according to the present invention in the drying of a fiber web during the entire stop. In some embodiments, according to the present invention in the drying of a fiber web during part of the time is stopped. When the fibrous web is stopped, the fibrous web may, for example, in binding position and/or bonds the position nearby drying. The bonding position and/or adhered to the drying of a fiber web near the position, can be reduced by bonding two sheets joined together by the shrinkage difference between the fiber web.

Through before operation, or before a stop of the bonding, for example, before the, drying web in a short time, the drying cost savings. Typically, in most of the time, the fibrous web in the case of standard, therefore does not need drying according to the present invention.

According to one embodiment of the present invention, the operation is performed on a fiber web comprising a glued connection of the two pieces are joined together a fiber web, during bonding by this so that the cutting machine remain in the fiber web in the vicinity of the blade, or the blade of the cutting machine will be during bonding fibrous web, drying before the bond. For example, when giving the roller exhausts crash or in the middle, by bonding a fiber web is bonded to 2nd sheet on the fiber web. For example, when during the bond adhesive used to butt-joint when the (butt   splice   joint), the fibrous web stop; or the continuous paper machines when the bonding (flying   splice), to a fiber web is lower than the standard operation of the operation speed of the speed.

According to one embodiment of the present invention, is performed on the fibrous web by bonding the operation includes the two pieces are joined together a fiber web, the fiber web is in these before the at least one of the position and/or the bond near the bonding position of the drying. For example, when the machine when the roller exhausts , by bonding the two sheets are joined together a fiber web. treats the cementation the moisture content of the fibrous web may be different, or in the after bonding during bonding, may be a fiber web shrink at different rates. For example, by the adhering position and/or bonding position of the drying has been brought to the vicinity of the cut fiber web rewinder 1st, can make the 1st and contraction of the fiber web from the new change of the fiber web 2nd of the difference between the contraction of the reduced. The operation unit is thus bonding the device, and is used for drying of a fiber web drying device is arranged in the vicinity of the bonding device.

According to one embodiment of the present invention, in the repair of a fiber web tearing or defect (for example holes) before the drying of a fiber web. Fiber tear or hole in the web, for example, can be through other fiber or fiber web material piece repair to repair by sclaffing (taping). For example, the fiber web will tear in the vicinity of the other set to substantially a fiber material piece (another fiber web material piece is set up and is used for repairing fibrous web) dry like, can be caused by contraction of the different fiber web to minimize the disadvantages of different. At the same time, also prevents the fiber web to be repair of the drying and in the repair may be formed during the further tearing.

In accordance with one embodiment of the present invention a method, the fibrous web to be dried in the vicinity of that portion of the air maintained at a temperature of + 25 the above [...]. Under a standard operation situation, the fibrous web that portion of the to be dried the temperature of the air in the vicinity of the the + 25 can be always maintained above [...] , that part of the drying or treats the heating can be at an appropriate time, for example, begin before the stop or bonded. The temperature of the air may, for example, be the 25-50 [...] , the 35-40 [...] , the 40-50 [...] or 37 the [...] , the 40 [...] , the 45 or [...] the 50 [...]. For example, this can be through the periphery of the cover body in place of operation is realized (hood). For example, the of the blade reaches the cutting rewinder 0.5-2m distance or splicing a fiber web on the position of the distance around the bonding position is at the distance of 0.5-2m region can be kept in the above-mentioned temperature.

Many factors affect the drying of a fiber web. Needs to be, for example, based on the water content in the ambient air to change the moisture content in the fiber web. For example, when the ambient air temperature is 25 the [...] and the relative humidity is about 20% at the time, the attempts to make the temperature of 40 the with [...] 8% newsprints achieve moisture content of 3.7% the moisture content. For example, the quality of the fiber web, the fiber web drying before the moisture content and temperature, of a fiber web speed (running) influence and method for drying the drying time required and the change of the moisture content of the web. According to the present invention the duration of the drying, the fiber web according to the present invention single part of the drying time, for example can be 1-100s, 1-10s, 10-60s or 15s, 20s, 30s or 60s.

Even if that may not be always clear, in this specification referred to at the appropriate part of the embodiment according to the present invention and the advantages of each of the device and method.

Description of drawings

The following reference with photos more detailed description of the invention, wherein:

Figure 1 show according to an embodiment of the invention cut-away views along the machine direction;

Figure 2 shows the embodiment according to the present invention a part of the device; and

Figure 3 shown according to an embodiment of the invention a part of the device.

Mode of execution

In order to more clearly, for different example at least in a certain sense to each other in a portion corresponding to the mark in the Figure using the same.

Figure 1 shows the apparatus according to the present invention 1 of the schematic diagram of the cross-section. The fibrous web 3 from reverse winding machine 2 is directed to the cutting rewinding machine 4 of the blade 5. reverse winding machine 2 standard rotation direction and the web 3 for the standard A the advancing direction of the arrow, said B. The rewinder 4 concerned, in the web 3 has been under to along paper machine horizontal is provided with an air inlet passage 6a, the channel is connected to the air blowing nozzle 7a, its along paper machine horizontal to set up and have the width of the paper web as a whole. Blowing nozzle 7a is directional to, the under surface of the web 8a blowing. Blown air may be a heated air or the unheated air from the factory.

In the web 3 has been above the travel path is provided with a 2nd to along paper machine horizontal air inlet channel 6b. Inlet passage 6b is one of the already formed with a gap-type nozzle (that is, the blowing nozzle 7b) of the pipeline, the length of the web has the whole thereof. Blowing nozzle 7b is oriented to, the upper surface of the paper web 8b blowing. In the Figure 1 example, from blowing nozzle 7a and a blowing nozzle 7b of the air against the paper web is B blown to the direction of travel of the paper web 3. From the air blowing nozzle 7 of the air blown is shown diagrammatically with the arrowhead.

In Figure 1 with dashed-line 3b shown when the reverse winding machine 2 of the roller 9 in its integrity when the position of the original size of the paper web. As the unwinding continue to, roller 9 reduced diameter. The position of the paper web (in the roll 9 begin to reach under the condition of the tail end of the same) by digital 3 expressed.

Figure 1 of the device can, for example, play a role in the following way. From reverse winding machine 2 fibrous web 3 running speed according to the standard is supplied to the cutting rewinding machine 4, and further transferred to B in the direction shown by the arrow. When the fiber web comes close to the stop-time, in the transmission of the fibrous web 3 from the standard operating speed of the speed of the slowed to crawl speed. At the same time, in reverse winding machine 2 with cutting the rewinder 4 the area between, through the lower surface of a fiber web 8a and the upper surface 8b is blown from the blowing nozzle 7a, 7b of the air, the fiber web to 3 drying. After a certain period of time, in order to stop a fiber web bonding. In this example, therefore, to speed bonding of 0m/s. The fibrous web 3 by means of a bonding device, in order to known per se technology of bonding. When for example the intermediate roll or from the machine is exhausted a fiber web, to stop and adhesive. Drying, that is, from the air-blowing nozzle 7a, 7b the blowing of the air is not continuous, before the stop only, for example. Before the bond, the gluing position and/or bonded fiber web further drying near the position. As the drying, so that before the stop, the fibrous web 3 has transverse shrinkage along paper machine. Therefore during the stop, a fiber web substantially 3 will not be further retracted, the pointing web strength minimum and tearing of the web. After bonding, reverse winding machine 2 once again starting, reverse winding machine 2 and the fibrous web 3 once again accelerated to the speed of the standard running speed.

may from attempt 1 see that, by appropriate selection of blowing nozzle 7a, 7b with respect to the fixed position of the fiber web, in all cases can be relatively close to the fibrous web 3, 3b to carry out air blowing. For example, in the Figure 1 solution, roller 9 when the, upper nozzle 7b close to the paper web, and roller 9 when empty, lower nozzle 7b close to the paper web. Therefore, paper web 3 can be obtained in at least one side of the effective drying.

Inlet channel 6 and a blowing nozzle 7a, 7b rewinder department in the past can be formed of a part of the air humidifying system, for example, have utilized inlet passage 6a to the moisture device 1, has been air from the nozzle 7a to the paper web 3. According to one embodiment of the present invention, such a humidifying system can be used according to the invention, the drying device 1 substituted, so as to produce a dry, may be heating air device is connected to the inlet passage 6a. Dry, may be heated air of the air conditioning apparatus can be used, for example, air-conditioning device includes, for instance, filter, blower and the heating unit. The heating unit may include a resistor, steam radiator, water radiator , gas burner or other corresponding heating device, by means of the heating unit, is blown to the air is heated to the desired temperature. Blowing nozzle channel system is connected to the air-conditioning device.

Figure 2 according to the present invention showing one embodiment of a portion of the drying device. For direction of the air flow in the arrow shown. In the Figure 2 in, in the web 3 has been along paper machine horizontal to above is provided with a plurality of air inlet channel 6. The total width of the paper web on the surface of which is provided with a nozzle 10 ; the nozzle surface 10 is located on the surface of the inlet passage under, DPRK to the paper web to, is provided with a plurality of small air blowing opening 7. The nozzle surface 10 is configured to primarily with parallel fibrous web to be dried. In the drying period, the fibrous web 3 and the surface of the spray nozzle 10 is the distance between the 20 mm. Air from the inlet passage 6 through the, a number of separate opening at 7, gas flow through the opening 7 is oriented toward the fibrous web 3 on the surface of, the air by this drying a fiber web. The inlet channel 6 is arranged between the outlet channel 11, the outlet channel flows into the moist air, and the air through the outlet passage to travel to leave the fibrous web 3 near. Inlet passage and between these inlet passages may, for example, of the outlet channel of the other shell around by the cover, in a controlled manner by the moisture is removed from the device.

Figure 3 shown according to one embodiment of the present invention drying device of a blowing nozzle that is, the so-called floating nozzle 12. for example was mad floating nozzle 12 can be set up in the fibrous web 3 below, this can make use of this nozzle in the nozzle 12 and the fibrous web 3 of the fiber web produced between the floating air cushion. Figure 3 shows the floating nozzle 12 which is composed of an air inlet channel 6 and parallel air blowing channel 13 form, the air inlet channel 6 is of a paper at extremely high sensitivity, parallel air blowing channel 13 is in the air inlet channel 6 of the two sides. Air from the inlet passage 6 through these air blowing channel between the opening of the wall 14 into the blowing channel. Blowing passage 13 towards the desire of the fibrous web 3 formed on the upper surface of the surface of the spray nozzle 10, the nozzle surface 10 with the desire of the parallel fiber web to be dried. Nozzle in the surface 10 has been formed in a plurality of small air blowing opening 7. From the blowing opening 7 of the air flow is oriented toward the fibrous web 3 on the surface of, the air by this drying a fiber web. Can be a part of the air blowing opening 13 is arranged to from the two air blowing channel 13 blowing towards each other, in order to optimize the floating effect. In the Figure 3 example, the blowing channel 13 of the edge of the most recent to each other in the air blowing opening 15 has been oriented toward the each other. Along the direction of travel of the web can have a plurality of successive air-float nozzle 12. For example, can be arranged between the adjacent floating nozzle to remove moisture. For example, also can make the humidified air through the device along the machine direction of the flow from the edge of the fibrous web 3 in the vicinity of. Air-floating nozzle 12 can be used, for example, cover or other shell around, in a controlled manner by the moisture is removed from the device.

The invention is not intended to limited to such as shown in the above example embodiment, but its the object of the invention is defined by the following claim the broad interpretation within the scope of protection.