FI118928B - Fibrous-web machine measuring roll for use in groove, has metal strip forming compressing cover layer on surface of fibrous-web machine measuring roll in groove under which sensor is located - Google Patents

Abstract

The roll has a G strip cover consisting of a metal strip (13) reeled around the measuring roll, which is tensioned and fastened from two ends of the strip cover, where the metal strip forms a compressing cover layer on a surface of the measuring roll in a groove (14) under which a sensor (11) is located. A filler/transmitting material (12) is set in the groove on top of the sensor, which is a pressure-sensitive film or strip sensor, and the filler/transmitting material is two-component resin, polyurethane mass and silicon-based material or rubber. An independent claim is also included for a method for covering a fibrous-web machine measuring roll.

Description

118928

Fiber web machine measuring roll and method for coating a fiber web machine measuring roll 5

The invention relates to a measuring roll of a fiber web machine according to the preamble of claim 1.

The invention also relates to a method for coating a measuring roll of a fiber web machine according to the preamble of claim 10.

With respect to the prior art, reference may be made to FI patent application 20055020, which discloses a method for measuring nip pressure and / or pressure profile. In the method, a pressure sensor is mounted on the nip forming roll under the protective layer acting on the sensor 15, and the nip pressure causes a deformation proportional to the nip pressure on the underside of the coating and deforms the sensor which reacts to the deformation by generating an electrical signal. Also described is a roll for measuring nip pressure and / or a pressure profile, which roll is provided with a pressure sensor positioned beneath the protective coating layer and which acts as a spring and in which at least one coating layer consists of a cold vulcanized polymer or composite. According to the disclosure, the sensor is protected by a cold vulcanizable polymer coating and one or more coating layers are provided on the sensor, with two coating layers being used, the bottom being provided with a groove for the sensor, the first layer also being hot-cured. The disclosure describes an arrangement in which the lower coating formed with a groove for the sensor is made of a relatively hard material or a material as flexible as the sensor itself.

Reference may also be made, in the prior art, to FI patent application 20055019 30, which describes a method for measuring the transverse tension profile of a web using at least one pressure-sensing strip transducer disposed helically along a roll surface with a film acting as a transducer or the areas run substantially below the coverage area and substantially completely free space during each roll revolution. A roll for measuring the tension profile is also known from the publication, in which a spiral oblique pressure transducer strip is mounted on the surface of the roll 5 which is obliquely facing the web and has a measuring distance substantially equal to or shorter than the web covering angle for measuring the transverse web tension profile. The publication describes arrangements where the sensor is located under the protective layer, the sensor is mounted in the protective groove or on the roll surface 10 without the protective groove. Examples of the protective layer are the said ceramic-resin composite coating.

As is known in the art, scraping prevents the web from rotating around the roll in the event of a web break and from contaminating the roll surface. Scraping may be carried out mechanically with a scraper blade that scrapes the surface of the roll or with a non-contact air blowing scraper.

However, the soft coating typically used in prior art measuring rolls is not mechanically scrapable and, on the other hand, measuring rolls are used in certain positions of the fiber web machine and / or in the manufacture of certain fibers. the types of webs, such as tissue papers and paperboards, must have the surface of the measuring roll * - 1 •; 1; can be scraped off to keep the roll surface clean and therefore • 1 · · • 1 · ,. the fact that air scraping is not always efficient enough and / or that it causes noise.

It is an object of the invention to eliminate or at least minimize the above drawbacks and problems of the prior art arrangements.

It is therefore an object of the invention to provide a measuring machine for a fiber web machine, the surface of which can be mechanically deformable.

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On the other hand, it is known in the art, especially in the art related to the press rolls of fiber web machines, to produce a roll surface by twisting a sintered and / or rolled strip on the roll body. In this case, a tight strip is wound around the roll and welded to its ends. At the same time, the ribbon can be used to provide a wish-5 groove on the roll surface. This known technique is called G-stripe technology and is described, for example, in FI Patent Publication 81183.

In order to achieve the above and later objects, the measuring roll according to the invention is essentially characterized in what is set forth in the characterizing part of claim 1.

The method of coating the measuring roll of a fiber web machine according to the invention is essentially characterized by what is stated in the characterizing part of claim 10.

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The invention has realized in a completely new way the application of the G-strip technique known per se in a very new, demanding application, taking into account the special requirements of the measuring roll for the coating and the coating method ··· lv * • · t ·: *. 20 • * ·; ***; According to the invention, there is provided a measuring roll of a fiber web machine, preferably • · · •: *: a measuring roll of a roller which, if necessary, withstands mechanical scraping because it · · · «· ** .. is coated with a hard metal strip or G-band. In accordance with the preferred embodiment of the invention, to prevent damage to the sensor during G-strip plating 25, the sensor positioned in the groove on the roll surface is designed to be protected by a filler / transfer agent during coating, which allows measurement in the finished roll. · When the filler / carrier fluid transmits the pressure / force applied to the sensor to the sensor. Preferably, the filler / vehicle is a liquid, non-curing agent, such as a two-component resin or other, during G-strip coating. 30 corresponding two-component material, polyurethane mass, suitable silicone-based material • «·» »or rubber, for example, a precise rubber band to be glued. The filler / carrier may thus consist of, for example, a first component to be placed on the sensor and a second agent applied during coating to activate curing. If necessary, the ends of the sensor groove are provided with an end strip or the like which prevents the filler / transducer from flowing out during the G-strip coating. The filler-5 / neurotransmitter has a temperature resistance of at least about 80/100 ° C.

In connection with the invention, the G-band coating is carried out as described, for example, in U.S. Patent No. 4,748,736. The G-band forms a desired surface, smooth or grooved, on the measuring roll, which is the outer surface or intermediate surface of the measuring roll, the measuring roll further comprising one or more coating layers to be mounted on and / or below the G-band coatings.

According to a preferred embodiment of the invention, the measuring roll of the fiber web machine comprises a pressure / force sensitive sensor mounted in a groove on the surface of the roll shell, whereby the sensor is not damaged during the installation of the tight G coating strip. The measuring roll thus also comprises a hard metal strip surface, preferably a G strip surface, which, when mounted, preferably has a liquid or gelatinous filler / transfer medium on top of the sensor in the groove, which is not cured at this stage. As the tape is wound at the sensor, the tape will undergo some tension due to tension ·· * · (20 grooves displacing liquid filler / carrier material. Tape tightener · ***; Over filler slot, excess filler / carrier material may be displaced from the groove.) ··· •: *: The tension of the tape does not damage the sensor, but the force / pressure can be transmitted to the sensor through a hardened filler / transfer medium at the finished measuring stage.

According to a further advantageous feature of the invention, the measuring roll of the fiber web machine comprises at least one coating on and / or below the G-strip coating.

9 9 *: · *: The sensor of the measuring roller according to the invention is preferably a pressure / force sensitive measuring device. * ··. 30 flood sensors, preferably pressure / force sensitive membrane or strip sensors, such as • ·· »Electro-Mechanical Film (EMF) membrane sensors, which allow • 9 118928 5 to measure nipple load and nip force profile easily and easily. precisely.

The measuring roll according to the invention is preferably applied in connection with the rolls of fibrous webs, in particular paper webs, but it is also applicable as a measuring roll used in, for example, presses and surface sizing units.

It is known in the art to use roller coils for fiber web machines, such as paper and board machines, in which a fiber web made on a fiber web machine such as a paper-10 machine / board machine is rolled into a full-width web for machine processing. The web is wound around a winding shaft, for example, a reel iron / roll, either through a surface draw in a winding nip between the winding cylinder and the forming web roll, or utilizing a center drive, wherein the winding shaft is also provided with drive. In the case of fiber web machines, such as papermaking and board machines, unwinding rollers are also used in which a roll of reel rolled on a reel is unwound at a later stage of processing for further processing of the fiber web.

. ί. For example, a measuring roll of the invention can measure a nip force profile of ··· 20 l as the measuring roll forms a nip with another roll / web roll, whereby the measuring roll • * * * *; a measuring membrane sensor mounted on the surface of the roll roller of the roller performs the measurement.

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In the following, the invention will be described in more detail with reference to the accompanying drawings, in which details, however, the invention is not intended to be narrowly limited.

1A-1B schematically illustrates an embodiment of the invention.

• · • ί · ·; Figures 2 A-2B show schematically the coating of a roll with a G band.

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According to an embodiment of the invention shown in Figures IA-IB, a sensor 11, preferably a pressure / force sensitive membrane sensor, is disposed in a groove 14 on the roll shell surface of a fiber web machine. The measuring roll 10 is coated with a G-band 13. Thus, according to Fig. 5, the measuring roll of the fiber web machine comprises a pressure / force sensitive sensor 11 mounted in the groove 14 on the roll casing so that the hard coating strip 13 is not damaged by the sensor 11. . During the installation of the G-strip coating 13 of the measuring roll 10 in the groove, there is a liquid filler / transmitter 12 on the sensor, which at this stage is not cured. The tape 13 is slightly pressed into the groove 14 by the tension career 14.

Figures 2A-2B show an exemplary embodiment of installing a G-strip coating 13 as a coating on a roll 10. The G-band 13 is wound around a roll with a tight tap 15 which is finally welded to its ends. During winding, the G-band 13 is tensioned over the yield limit, whereby the band 13 forms a pressure coating layer on the roll 10. G-band coating utilizes the G-band technique known per se, as described, for example, in U.S. Patent No. 81183 and U.S. Patent No. 4,748,736.

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As shown in Figures IA-IB, the sensor 11 of the measuring roller 10 is positioned within the roller

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J · * · in a groove 14 formed on the surface so that it is not damaged during winding of the tape 13.

· T · 1 · .. In addition, in the groove 14, a filling / conveying agent 12 is placed on the sensor 11, which further 2: protects the sensor 11 and additionally ensures that the force / pressure is transmitted to the sensor 11 in the measurement. 2A and shows • · | * .. an example of a G tape. The G-band is made of spring steel type material, which is · ·· thin. The G-band 13 forms a desired surface, smooth or ····· groove on the measuring roll 10, which is the outer surface or intermediate surface of the measuring roll 10, the measuring roll 10 comprising * ·· * · possibly over and / or below one or more G-band coatings. ··. 30 coatings to be installed.

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The invention has been described above with reference only to some advantageous embodiments thereof, the details of which, however, are not to be construed in any way as being narrowly limited.

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Claims (14)

1. A measuring roller (10) for a fiber web machine, on which roller a sensor (11) is arranged in a latch (14) received in the surface of the roller, characterized in that the measuring roller (10) comprises a G-band coating (13), consisting of a metal band (13) wound around the measuring roller (10), which is clamped and secured to the ends, the metal band (13) forming a coating layer pressed against the surface of the measuring roller (10), the sensor (11) being located in the groove (14). ) during this. 10 2. The measuring roller (10) according to claim 1, characterized in that the measuring roller (10) comprises a filling / forming media material (12) placed in the groove (14) of the sensor (11). 3. Measuring roller (10) according to claim 2, characterized in that the filling / intermediate material (12) is a liquid, uncured material under the coating with a G-band. 4, Measuring roll (10) according to claim 2 or 3, characterized in that the filler / intermediate material (12) is a two-component resin or some other corresponding two-component material, a polyurethane material, a silicone-based material or a guniini. aa a · • aa • aaa • a * ··· * 5. Measuring roller according to any of claims 1-4, characterized in that the measuring roller comprises at least another coating layer on and / or under the G-a * band coating (13). a · ** "* 25 6. Measuring roller according to any of claims 1-5, characterized in that the G-band I "#" (13) is a thin material of the spring type. Measuring roller according to any of claims 1 to 6, characterized in that the sensor \ 30 (12) is a pressure-sensitive film or strip sensor. a ·· a a a a aaa aa a aaa a a a a 118928 Measuring roller according to any of claims 1-7, characterized in that the measuring roller (10) is arranged as a measuring roller in a wheelchair for a fiber web. Measuring roll according to any of claims 1-7, characterized in that the measuring roll 5 (10) is arranged as a measuring roll in a press in a fiber web machine. Method for coating a measuring roller (10) in a fiber web machine, in which method a sensor (11) is placed in a latch received in the surface of the manifold by the measuring roller (10), characterized in that the measuring roller (10) in the method is coated with G-10 tape technology, which coating is formed by winding a metal band (13) around the measuring roller (10), which band is tensioned and fixed at the ends, the metal band (13) forming a coating layer pressed against the surface of the measuring roller (10). , wherein the sensor (11) is located in the latch (14) below it. 15 Method according to Claim 10, characterized in that in the method a filler / intermediary material (12) is placed on the transducer (11) in the groove (14) in the measuring roller (10). Method according to claim 10 or 11, characterized in that the filler / liquid / intermediate material (12) is poured liquid and uncured during the coating with the G ···: * · * band and that the filler / intermediate material (12) gets cured / cured at the latest before *** · 1. * * The measuring roller is used. • · • · · • · · ·· «·» · • *: t " Method according to any one of claims 10 - 12, characterized in that as a filler / intermediate material (12), a two component resin or something else is used. the corresponding two-component material, whose activator is applied in conjunction with the • · • «« coating with G-band. • t 14. A method according to any of claims 10 - 13, characterized in that at least one other coating layer is applied to the measuring roller (10) and / or un- ··· ϊ ,,, ϊ der G -band coating (13). ·· · t · ♦ • · • ·