FI108633B - Method and system on a paper web finishing machine or the like - Google Patents

Description

108633

METHOD AND SYSTEM WITH PAPER FABRIC TREATMENT MACHINE OR SIMILAR

FÖRFARANDE OCH ANORDNING VID EN MASKIN FÖR EFTERBEHANDLING AV EN PAPPERSBANA ELLER MOTSVARANDE

The present invention is directed to a method and system as defined in the preamble of the independent claims below, on a paper web or similar post-processing machine or the like.

The present invention is particularly directed to a method and system for supplying dry paper end rolls, such as unwinding machines, rollers, longitudinal cutters, coating machines or calenders, to a level of humidity around the paper rolls waiting to be treated and the unwrapped paper web.

15 Generally, multiple rolls of paper are placed on a post-processing machine in a "storage space" to wait for post-processing on the machine. During this wait, air circulates around the paper rolls, which, when too dry, dries milli: i .: the outermost layers of paper webs. Also rolled out: ': 20 rolls of paper taken to the finishing machine have time! • If the humidity of the air around the machine is too low, the machine will • dry when the machine is stopped.

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The relative humidity of the air at the dry end of the paper tray is often very low. This is due, among other things. because of the abundance of heat sources in the dry end, • · · * · but not much sources of moisture, or humid air »· there is little flow from the wet end of the machine to its dry end, but vice versa. In winter, relative humidity can be. ··· 30 up to close to 20%. Such dry air causes in this dry, *. paper rolls at the end and unwrapped paper; *; harmful drying and shrinkage in the web, particularly in the transverse direction. Drying and shrinkage easily causes the 2 108633 paper to tear on the post-processing machine, especially when the machine is started up.

In paper rolls 5 from paper machines for post-treatment, the paper is generally at such a humidity that, in order to be equilibrium with ambient air, the relative humidity of the air should be significantly higher, typically about 50%.

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As a solution to this, it has previously been suggested that the entire dry end of the paper machine room be moistened with the required moisture. However, since the volume of the entire dry head is remarkably large, several thousands up to tens of thousands of 15 cubic meters, this wetting would require extremely large amounts of energy and water to achieve the equilibrium moisture required by the paper.

Shrinkage of the paper web as a result of drying, e.g. in 20 cutters, is a known problem. Previously, U.S. Patent No. 5,619,807 has suggested a solution for forming a hood around a stock paper roll and adjusting the humidity and temperature of the air inside the hood to an appropriate level. Proposed Fixed

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However, the 25-way hood hinders the continuous movement of the paper rolls, making the solution virtually easy! well used.

It is therefore an object of the present invention to provide a '' '30 paper web finishing machine to provide a better solution for keeping paper rolls and the like in the desired uniform humidity.

·. ; In particular, it is intended to provide a system for storing rolls of paper immediately prior to post-treatment so that their moisture content remains at the desired level.

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It is further intended to provide a system which | can create a limited airspace with paper rolls and similar humidity around.

It is yet another object to provide a method and system which can maintain the moisture of the paper rolls and / or the unwound web at a desired level with a relatively small amount of water and energy.

It is a further object to provide a simple and easy-to-implement system for maintaining the moisture balance of the paper rolls and / or the unwound web on a post-processing machine.

To achieve the aforementioned objects, the method and system of the present invention are characterized by what is defined in the characterizing parts of the independent claims below.

In the solution of the invention, the system essentially comprises means for blowing air of suitable moisture around the paper rolls or the paper web to provide such a dynamic air curtain. paper rolls and / or unwound paper web,

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The moisture content of the paper rolls and / or unwrapped paper does not substantially equilibrate or even exceed the desired uniform humidity of the web.

The solution according to the invention is characterized by one or more separate air jets extending from the first side to the second side of the paper rolls or unfolded paper webs in the aftertreatment machine. Air jets form an air curtain: one or more air jets directed from the first side of the machine · / 35 towards the other side. The humidity of said one or more air jets is greater than the humidity of the air surrounding the machine.

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Above the machine, in the context of the present invention, is meant the part of the machine in which the rolls of paper are unwound, stored, or where the roll of unwrapped paper is waiting to be exported for actual finishing. According to the invention 5, one or more air jets extending from a first side of the machine to a second side of the machine are blown above this part of the machine such that said one or more air jets mix with the surrounding air to provide said one or more rolls and / or rolls of paper. an air space high enough to prevent the paper roll and / or unwound web from drying, or suitable to level the moisture of the paper rolls and / or unwrapped paper web to be processed to the desired higher, or sometimes lower, level.

The air jets are provided by a blow box of the required length in the machine direction, 20 - arranged on the first side of the machine, preferably on the service side of the machine, preferably 1 - 2 m above the paper rolls, and - equipped with the opening width bj is> 15 mm, typically 20 to 80 mm, or. - a plurality of longitudinally arranged slit or hole nozzles having slit orifice nozzles having a hole width > 15 mm, typically 20 to 80 mm, and having orifice diameters from 10 to 40 mm, or * * »- in several longitudinal directions of the machine, in series · ·:: come with a separate blow nozzle with ··· 35 nozzle apertures between 20 and 100 mm in diameter.

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Preferably, means are provided at or near the blowing box for humidifying the air of the first air jets to a level higher than that of the air surrounding the machine. Preferably, the air is wetted by evaporation wetting, whereby the air temperature decreases.

The system according to the invention preferably further comprises: - means for blowing second air jets below the paper rolls on one side of the machine towards the first 10 sides of the machine and - means for wetting the air blown from the second air jets, preferably by evaporation wetting or steam wetting.

Said means for blowing the second air jets are arranged mainly on the floor level of the data room and are provided with - air jets with a slot area of the area to be treated with a nozzle opening width t>! 20 is> 15 mm, typically 20 to 80 mm, or - Multiple longitudinally arranged slot or hole nozzles having a slot nozzle width bi> 15 mm, typically in the longitudinal direction of the machine. 20 to 80 mm, with holes for nozzle holes : V. 25 is between 10 and 40 mm, or; ^ - Multiple longitudinal machine consecutive fitting-! come with a separate blow nozzle with; the nozzle orifices have a diameter between 20 and 100 ';'; ' mm.

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The relative humidity of the air jets of the air curtain formed above the machine is generally about 30-60% •: higher than the relative humidity of the air around the machine, · *: the humidity. The relative humidity of the air jets is typically about 60-95%, preferably about 80-90%.

Above the machine, air jets are generally blown which have a temperature of about 5 to 15 ° C lower than the ambient temperature of the machine, or preferably <20 ° C, typically about 16 ° C. The air jets are then blown above the machine at a temperature so low that the air jets tend to flow downwardly by mixing with the paper rolls on the machine or the unwrapped paper web on the machine. Air jets use the air in the data room, which is wetted by evaporative wetting, whereby the temperature of this air often drops to a suitable level.

In a preferred embodiment of the invention, the inflatable air is typically filtered room air having a temperature of, for example, about 26 ° C and a humidity of about 30% Rh (rela-15 tive humidity = relative humidity). Preferably, this air is wetted by evaporative wetting, e.g., to about 90% Rh, whereby its temperature drops to, e.g., about 14 ° C. The sub-heat jet thus formed tends to settle and thus mixes with the air below, e.g. between the paper-20 rolls. This creates an air space around the paper rolls having a temperature of, for example, 23 ° C and a humidity of 50%, which corresponds to the equilibrium moisture content of the paper rolls, i.e., the moisture that maintains the paper moisture uniform throughout the paper roll.

25! The solution according to the invention can be used as such; known blowing nozzles for controlled blowing; / jets above the van space. The air jets are preferably dimensioned so that their velocity v · 30 on the other side of the machine, i.e. the rear of the controlled area (typically the machine's operating side), is small <0.8 m / s, typically about 0.5 m / s, run down the other side of the machine toward the floor.

In other opposite directions and typically air jets blown along the floor of the data center, · ', ·: preferably also air in the data room. In a preferred embodiment of the invention 7,108,633, a slit nozzle is also used, which is located on or near the rear edge of a controlled area of the floor, a control volume. The floor blast thus obtained blows a small shower 5 of cool or heated air in the opposite direction along the floor. The temperature of these second air jets may be higher than the temperature of the first air jets.

The control volume humidity and temperature control 10 can also be influenced by controlling the evaporative wetting of the floor jet, or possible steam wetting.

The solution according to the invention is able to control the humidity conditions of the paper rolls and the paper web without the need for fixed working hood structures. At the same time, the amount of water to be treated can be kept to a minimum.

With the solution of the invention, the jets 20 can be used to limit the air-conditioned space to a minimum in order to minimize fan power and water volume. The humidified air is obtained by the temperature and velocity of the air jets and by the possible additional jets, rotating in a controlled manner around the paper rolls and / or the unwound web. * * · 25 air blowers can be made especially in thin paper grades When starting, only keep the post-processing machine, eg the open * · · * reel or cutter, stationary. Blows are stopped; / when the mower starts to crawl. There is no time for harmful drying to occur when the rolls of paper rolls and the web are moving.

The solution according to the invention provides control- ': inside the sump to form a constant humidity and temperature, ·'; la. The combination of these is adapted so that there is no substantial transfer of moisture between the paper and the air. Then there is no embarrassing stretching or shrinkage of the paper web. The desired air option »·! The color space of 108633 e varies as a function of paper quality, humidity, and temperature.

One of the basic ideas of the invention is to achieve the desired temperature and humidity conditions in a control volume using air jets of different temperatures. There are many ways to manipulate the temperature, but the goal is always the same. Also, humidification of the air can be achieved by various methods.

10 The paper roll generally has the correct humidity when it enters the dry section of the data center and therefore it is important that water / moisture transfer cannot occur between the air and the paper web. Conversely, heat transfer is generally not harmful.

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The invention will now be described in more detail with reference to the accompanying drawings, in which

Fig. 1 is a schematic vertical cross-sectional view of the unrolling machine fitted with the system of the invention, Fig. 2 is a side view of the unrolling machine of Fig. 1, and Fig. 3 is a top view of the unrolling machine of Fig. 2.

• »· • * • ·» · * * '·; Figures 1, 2 and 3 show the unwinding machine 10 in cross-sectional, side and top view. The system 10 * i · V. · is connected to a system according to the invention to provide suitable air * V * 30 operation around the paper roll 12. The unwinding machine 10 comprises a frame structure 14, 14 'having:' 1 * supported paper rolls 12, 12 ', 12'1 which are to be unwound. The frame structure is adapted to floor level 16.

The machine 10 has a treatment side 18 and a drive side 20.

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The system of the invention comprises vertical air channels 22, 22 ', 22' 'and

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108633 an upper blower box 24 arranged to blast through horizontal slit nozzle 26 therein substantially horizontal air jets 28 in the transverse direction of the machine from operating side 18 to machine operating side 5 20. In the illustrated case, the system has only one common blowing box length. It may often be advantageous to split the box longitudinally into the machine and to provide it with a plurality of successive slit or hole nozzles.

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The air jets 28 form an air curtain around the paper rolls, which at least partially insulates the air space 32 closest to the paper roll from the air space 34 in the data room 34. The air 22 lower airspace. Heavier air jets 28 'flow downward, toward the paper rolls and between the paper rolls, mixing with upwardly rising air near the paper rolls 12 to provide the desired uniform air humidity in the space surrounding the paper rolls 32. The rest of the air jets are flowing protection also in front of the ends of the rollers 25.

* .i .: A second blowing box 38 is disposed on the drive side of machine 10, from which nozzle 40 blows air jets 42: from floor 16 to machine service side 18. Air jets along floor ·; ··· 30 are warmed by warm paper rolls they lighten, and at least a portion of 42 'rises upwardly toward the paper rolls and intermixed between the paper rolls and the air surrounding the paper rolls. Part 42 ''. air jets will travel to the care and protection of the ... 35 as it rises upwards paper-side ends ·; · * from drying out.

• * f 10 108633

Blowing box 38 can be blown with the same air as blowing box 24, whereby the blowing air is wetted in evaporation humidifier 30. On the other hand, it may sometimes be necessary to humidify the air without lowering its temperature or even rising. Alternatively, the blown air may be humidified in the evaporator humidifier 44, which is shown by way of example only in Figure 1.

The invention is not intended to be limited to the exemplary embodiment described above but, on the contrary, is intended to be widely applicable within the scope of the invention as defined in the claims below.

Claims (16)

11 108633 A method for wetting the air around one or more paper rolls 5 and / or unwound paper webs in a paper web finishing machine or the like, comprising: - blowing from said first side to one side of said paper roll and / or unwound paper web. or 10 more air jets having a moisture content greater than the air surrounding the machine, characterized in that one or more air jets extending from the first side of the machine to the other side are blown over said at least one roll of paper and / or rolled paper. A method according to claim 1, characterized in that one or more air jets having a relative humidity of about 20 to about 30-60% higher than the relative humidity of the air surrounding the machine are blown above the machine. Method according to Claim 1, characterized in that one or more preferred blowing devices are blown above the machine. More preferably, a plurality of air jets having a relative humidity of about -60% to about 95%, preferably about 80% to about 90%. Method according to claim 1, characterized; / that one or more air jets having a relative humidity of * · 'are blown above the machine such that said one or more air jets, when mixed with the air surrounding the machine, produce said one or more rolls of paper and / or unwrapped paper. an airspace having a suitable level of humidity around the web to: 35 adjust the moisture of the paper rolls to be processed on the machine and / or the unwinded paper web to the desired level. 12 108633 Method according to claim 1, characterized in that one or preferably several air jets are blown above the machine at a temperature of about 5 to 15 ° C lower than the ambient air temperature of the machine, preferably <20 ° C, typically about 16 ° C. 6. A method according to claim 1, characterized in that one or preferably several air jets are blown above the machine at a temperature so low that ambient air is so low that the air jet tends to flow downwardly by mixing with the surrounding paper rolls or unwound paper web. A method according to claim 1, characterized in that one or preferably several air jets are blown above the machine, the speed of which has decreased from <0.8 m / s, typically <0.5 m / s, when reaching the other side of the machine, with the il-20 blast jet flowing down one side of the machine toward the floor. A method according to claim 1, characterized in that said one or more air jets 25 use data center air which is wetted by evaporation contact, whereby the temperature of this air decreases. A method according to claim 1, characterized; that is, one or more second air jets directed from the other side of the machine towards the first side of the machine, which is higher than the humidity of the air surrounding the machine and rising as the temperature rises, mixing with the paper rolls. . ·! : 35 10. A method according to claim 9, characterized in that said one or more other air jets are used for dewatering or steam wetting air. A system for wetting the air around one or more paper rolls (12) and / or unwound paper webs in a paper web finishing machine, or the like, comprising: - one or more first members arranged on top of one or more paper rolls and / or unwound paper webs. for blowing an air jet from the first side of the machine towards the other side, the means comprising means (30) for moistening the air to be higher than the humidity of the air surrounding the machine, characterized in that means (22, 24, 26) for blowing one or more first air jets is fitted on the first side of the machine. System according to claim 11, characterized in that it comprises means (30) for wetting the air to be blown by evaporative wetting. A system according to claim 11, characterized in that it further comprises means (38, 40) for one or more second air jets. J. ' (42) for blowing below the rolls of paper from one side of the machine to the first side of the machine and I-means for humidifying the air of the second air jet, preferably by evaporation or steam wetting. I 30th System according to claims 11 to 13, characterized in that the system comprises means for raising or lowering the temperature of the air jets to a desired temperature level. A system according to claim 11, characterized in that the means for blowing the first air jets comprises a blowing arrangement which extends over the area to be treated with the air jets, which is arranged on the first side of the machine, preferably on the treatment side of the machine, preferably 1. - 2 m above the rolls of paper, and - equipped with - a slot nozzle having a nozzle opening width b1 of> 15 mm, typically 20 - 80 10 mm, generally in the machine direction, or - a slot arranged several times in the longitudinal direction of the machine - or with orifice nozzles having a bx nozzle aperture width bx> 15 mm, typically 20 to 80 mm, and bore nozzle bores 15 having a diameter between 10 and 40 mm, or - separate blowing nozzles with a number of nozzle orifices fitted between 20 and 10 0 mm. 20 System according to Claim 11, characterized in that the means for blowing one or more other air jets are arranged mainly on the floor level of the data room and are equipped with air jets 25, mainly in the machine direction. slit nozzle with a tensile region of: nozzle opening width bx> 15 mm, typically 20 to 80 mm, or * ». - a plurality of longitudinally adapted slit or hole nozzles having a slit orifice nozzle width bx> 15 mm and a diameter of the orifice nozzles of between 10 mm and 40 mm, or with separate blow nozzle suck with. : The diameter of the 35 orifice openings is between 20 and 100, ···. mm. 15106833