DE1942529A1 - Method and device for determining and optionally further evaluating the transverse profile of the moisture content of moving webs made of paper and the like. - Google Patents

Description

1942528

Paul Lip pie e

Method and device for determining and, if necessary, further evaluation of the transverse profile of the moisture content of moving webs made of paper and the like.

The invention relates to a method of locking and, if necessary, further evaluation of the transverse profile of the moisture content of moving webs made of paper and the like.

For determining the transverse profile of the moisture content of moving webs made of paper and the like, scrolling moisture meters are already known, which back and forth across the moving web at a speed of, for example, 2.5 m / mia be moved. That of such a moisture meter obtained measured value »are s.B. fed to a registration instrument, the feed of the registration strip with dtr Traversing movement of the moisture meter is synchronized.

In the production of paper webs, modern « Paper machine speeds of the paper web up to 1000 m / min. The widths of such tracks can be, for example, 5 m. Will a speed of 2.5m / min for a traversing Based on the moisture meter, it takes 2 minutes for the moisture meter to move from one edge of the web to the other has arrived. During this time, the BaM is already at 2000m Moisture meter walked by. Si «thought» Mefiapur des

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Moisture meter is a diagonal la of a 2000s long and 5 "wide pike-corner. Bat down the moisture content the length of the web material fiber dies® is considerable- ■ can change, know this measurement from a real one Measurement of the cross profile of the moisture content cannot be spoken of. There is also, for example, a paper machine the possibility that as a result of inaccuracies at the drying cylinder ^ periodic changes in moisture of the B & hmtat®riala occur, often over the entire width are equal to the track. Also because of this fact never can with the elaea tracing moisture meter a real® distribution of the moisture content over the Width of the web, to be determined! »©« according to 1st due to the measured value obtained in this way was not a good one Control of the moisture content® «aoglloh. Likewise is a fast and accurate regulation based on '" this 'Mefiwerterfaeeung' uiaöglicb ·

The task of the invention is therefore su ^ ruode, a real one Cross profile d @ s Femalitigikeitegeläaltes a »'moving track, inshtsonder «a P & pierbaha, sii aeseen, over an exact Registration and Amwerttmg see below

The solution di®e®r Aufgs &# is geslB the present invention dadurefe gekennseloMet _n that a · Torztagswelse represents Ansah! the Stoffauffülurangslippeii amr Pe.pier "a" © liin® according to "number across sur movement direction of the spell of adjacent and parallel below the plane arranged Pe ^ ^ uehtie celteaesser ter.-turns is" the Meßwert® .for a "" sisng gleldaseitig, bsw la view, the spell on the viscous windlgicelt almost on the same side j® a Spsleler suggests weMen «so && aa the g · -. - ■ epei®h®rt®n MüBwtrt © w © migat®as amiäMesfsä · e®nlof®eht sur M-wegungerlchtusxg der.-BsJm side-by-side lannstelien

are assigned, and that the measured values are stored in the memory Display or registration of the Qüerprofiles and / or for Regulation can be taken.

By using a plurality of moisture meters, it is therefore possible to have one for each point transversely to the moving one thought to run along the path. Line to determine the respective moisture content at the same time.

According to a preferred method, the electrical measured values of the moisture meter are constantly fed to a charging resistor for each storage capacitor bit, with both the power supply of the moisture meter and the discharge circuit of each EntIftde ^ lderstandee being interrupted at the time of a measurement of the transverse profile, so that the time The measured values obtained from the measurement of the moisture meters remain stored in the storage capacitors. The measured values obtained are therefore supplied to memories so that they can be stored for practically any length of time. For the purpose of registration, the measured values are taken from the memory, for example, one after the other, each individual measured value being taken over such a long period of time that the inertia of the recording instrument has no effect, so that a correspondingly exact recording is made for each measured value. In a preferred manner, the registration takes place on a registration strip _4, which is moved further in time with the interrogation of the individual memories in the sense of the local succession of the moisture meters. In this way, a very clear representation of the distribution of the moisture content of the web material is created. However, it is also possible to use the individual measured values s «B. one after the other to a printer which prints them out in the form of digits. - For the elimination of errors, for the purpose of control or regulation

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and aleäeleg for any complaints about the quality the measurement results obtained in this way are a good basis for a paper roll. Because of the obtained in this way Measurement results can only be achieved by the present one Reasonably adapted control of the moisture content of a moving web can be made. It is advantageous to assign a Damp, Kaltsaesser to each feed lip so that the feed can be regulated can be selectively vurgenoimsn. Instead of the position of the To regulate the cloth guide lips, including a similar one A dryer can also be used to achieve moisture content of the web over its seeded width the web is selectively dried using hot air.

As a sensible implementation of the method according to the invention, the measured values are queried at the same time or separately from the recording of the transverse profile of the moisture content in such rapid succession and an entrant is sent "that - due to the inertia, the registration data is essentially the mean value? * the IaIs is recorded, while larger deviations from the mean value remain recognizable. If values of the moisture content deviate considerably from the mean value, corresponding indications result in the line drawn in the ftrlaaf dtr all mean value, which allow for possible sources of error. For example, as a result ron Ongenauigkeiten in the dry "sylindern the paper machine or periodic * Tinden in regelaleeigen From Feuentigkeitsaiiderungen occur which may extend beyond the width of the web geeaat * see swar, is LingeriGiitmng the Balm Jtdoelä" are ehr limited. Such sonwamungen can be found with the measurement of the

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Cross profile of the moisture distribution not or only are detected at random. - The advance of the recording strip of the recording instrument for the mean value expediently takes place proportionally to the respective speed of the web. To form the mean the moisture content can also be the sum of the values flowing through the discharge resistors of the storage capacitors Currents are used *

The invention also relates to a device for carrying out the method according to the invention. This device is characterized in that the number of moisture meters corresponding to the number of head delivery lips of the paper machine are arranged next to one another transversely to the direction of movement of the web and parallel to its plane on a common carrier and in the area of which openings for suction air are provided, whereby the web is kept in contact with the moisture ames. The moisture meter arranged next to one another - with dimensions of, for example, 15 cm of a moisture meter in the direction transverse to the direction of movement of the web - achieves good resolution when measuring the transverse profile of the moisture content of the web material. By using the suction air atändigke Eontakt the web is retained with the hygrometer, so that no errors by temporarily lifting the web to flutter or sound can arise hygrometer.

A special embodiment of the device according to the invention is characterized in that the moisture meters are arranged in a housing that is essentially open only towards the web, and that they together face the web

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old walls that form openings for the moisture sausage For example, in the hone ait finish the moisturizers and that the housing is connected to an Eaeh & ustor. /

The housing advantageously consists essentially of one

495Γ

Double T-beam, one side of which is covered 'and an air duct forms for the fresh air while on the other side the fitness eaters are arranged. The cost of one such housings are with the best possible rigidity - the here for exactly® Meeeimg is important - compared to relatively low

Figures 1 to 3 &# r Zeleamiag, the invention is explained in more detail below

Fig. 1 sslgt the order in soheraatiselier Das-stslluag - the ability list against the moving web;

Fig. 2 is as follows:

Principle of the dl # l®ktrleeh®n measurement for work «ad # a

Fig. 3 shows a set of triggers for the humidity aaesBer ia Scimitt "with the oil inxmgzn for the action of sound air on the moving body.

In Fig. I is © is. Üger id «rg« et »llt, the nick is supported on stands. la-fräger "1» lad. femehtigkeiteataeer 3 attached,. Sera StoSwertgfber d «r moving BaIm 4 reversed si & d. BIe. In £ d« hnii3ag & ®3? ' ? euoktigk «it« as «eeer qia« r on the direction of movement of the path is T®rsugsw9ise * o little wi «possible _{9 over} a good iitflösiing of the approved Qnerproflls dts Feu © litigk®itsg®hältee the web ssu received. Zxm, purposes ^: Lips a hsg®I? isig d®r fabric

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However, the measuring range of the paper machine should be every A moisture meter about the width of a fabric lip to match.

An interrogation device 5 is also shown schematically in FIG. 1 shown, the bits connected to the moisture meters 3 is. Registration instruments e 6 and? mn. The entry instruction 6 is used for Record the transverse profile of the moisture content of the Web material, the Segietrierimstrument 7 serves essentially to record the mean value of the moisture content.

Further details of the electrical circuit of the moisture meter and the Ibfregsijirieatiiiig as well as the connected components are from Flg. 2 zn. remove.

In Flg. 2 1st belejS »ls« * I «^ the« electric circuit for a moisture »*« e «tr 3 davaesstvllt« 'd «r siftch the sislectrical principle works. The FeiaeatlgiE "it * ne8e®r 3 has as MeSwertgeber a Mefikondeaeator 8 AÖF * its I & pasltät τοη the Bielektrisltätskonstsntea Aeee BaimBateriftls, SB, dee papers, is influenced" The Xefikondeiisater 8 "ine coil 9 is connected in parallel, the old ümt Mefikonäensator 8 a resonant circuit 8, 9 forms. A fiocafrequens generator 11 is connected to the oscillating circuit 8, 9 via a fiat coupling capacitor 10; Until a voltage is present at the oscillating circuit 8, 9, the height of which depends on the respective moisture content of the web material, it is fed to a capacitor 15 via a block 14. Furthermore, the capacitor 15 is via a diode 16 and a resistor 1? switchable to a terminal 18 at which a voltage is applied that corresponds to the Burchlafirichtung the

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Diode 16 is directed in the opposite direction and which is larger than that possibly after a measurement on capacitor 15 is lying tension. This lying on the terminal 18 Counter voltage can be switched on via a switch 19. For example the switches 12 and 19 - as shown, are mechanically coupled so that they are switched on simultaneously the counter voltage to the diode 16 provides the power supply for the High frequency generator 11 is interrupted. This ensures that the measured value stored after a measurement for the moisture content of the relevant area of the web the condenser 15 is practically long enough stands. - For a measurement, the switches 12 and 19 la are brought to the position that is shown in FIG Position is opposite. As a result, the '' oscillating circuit 8, 9 is supplied with high-frequency energy and the Capacitor 15 charges to a voltage that corresponds to the corresponds to the actual moisture content of the web.

The capacitor 15 is connected to one of the contacts 20 of an interrogation device 21, an interrogation device 21 has for example a Kontaktana 22, which is driven by a stepper motor 23 is moved. The step switch motor 25 is on a clock generator 24 is connected. With an adjustment handle 25, the sequence of the individual clock or switching pulses can be performed can be set for the stepper motor. For the Interrogation of the measured values of the capacitors 15 of the moisture meter 3, for example, such a clock frequency can be set be that the Eontaktars 22 each for two see one Contact 20 faces. This is enough time to complete the existing indolence of a regietrierinetruaents, in particular of a writing registration instrument, the correct measured value to record. In Figs. 1 and 2 are as registration

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instruments for the cross profile of moisture content and for the mean value writing instruments shown schematically. Instead of such writing instruments, however, it is also possible to use printing devices which each have Print out the measured values obtained. The advance of the registration strip of the registration instrument 6 is with the Interrogator 21 synchro & Isiersi *, so that the recorded Cross profile of the moisture content of the local The succession of the moisture meter compared to the moving path corresponds. The advance of the recording strip for the mean value of the moisture content is proportional the respective speed of the web 4. Thus, for every web or roll of paper or similar measured values recorded, which prove the moisture content of a web in so-called transverse profile as well as as an average value. % # Measurement of the transverse profile of the moisture content can be carried out in regular time intervals ^ s. B. in. Intervals τοη 5min.

When recording the mean value of the moisture content can be the same query device 21 or a different one Facility to be used. It is only necessary to e.g. the contacts 20 of the interrogator 21 in sufficient quick succession to the recording instrument, if necessary. via further amplification means to switch on. For example, the contacts 20 for all capacitors 15 could be on one Circular line be evenly distributed and the stepping motor 23 could be controlled by the clock generator 24 in this way be, dc 'j e.g. one revolution of the contact arm in one second 22 results. In most cases, this speed should be high enough to provide information about the inertia of the Recording instrument 7 essentially to record an average value of the moisture content, in the case of larger deviations

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tob mean, however, a noticeable deviation in the course of the recorded line. This makes it possible to draw conclusions about possible errors, particularly those that occur periodically, when measuring the transverse profile the moisture content cannot be determined or only accidentally.

The formation of the mean value of the moisture content Jcann also take place in such a way that the sum of the currents flowing through the resistors 17 is formed and a display and / or Recording instrument is guided.

Instead of the interrogation device 21, an electronic shift register, for example, can also be used with the same success.

Of course, instead of the moisture meter explained here,% moisture meters working according to other principles can also be used, without the lame invention this would -rerchanged.

In Flg. FIG. 3 shows the controller 1 for the moisture meter 3 i »section, which is fed into an exhaustor (not shown) via a drill hole 27. The hollow support T, which is made of a double-T support, forms together with the measuring condenser 8 of the Fenchtigkeitaiieeee? 3 openings 28 through which the air is sucked in. On d ·? ' One side of the carrier 1 is covered by a plate 29, so that an air duct 30 is created, to which an exhaustor (not shown) is connected. Buren & i · effect of the suction _T HeÜwertgebera other remains dl · Train 4 in constant contact with the Mefikeadenaatoren 8 bew. Of moisture "c" fibers. The components of each moisture meter 3, which are fastened in the carrier 1, are expediently accommodated in the switch box 26.

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Claims (1)

Claims Method for determining and, if necessary, further evaluating the transverse profile of the moisture content of moving webs made of paper and the like, characterized in that a number of moisture meters (3) lying next to one another transversely to the direction of movement of the web and arranged parallel to the plane thereof, preferably corresponding to the number of material feed lips of the paper machine is used, the measured values of which are fed to a memory at the same time or, with regard to the speed of the web (4), approximately simultaneously, so that the stored measured values are assigned to web locations next to one another at least approximately perpendicular to the direction of movement of the web, and that the measured values can be taken from the memories for displaying or registering the transverse profile and / or for regulation. 2. The method according to claim 1, characterized in that the electrical measured values of the moisture meter (3) are constantly fed to a storage capacitor (15) with a discharge resistor (1?), And that at the time of a measurement of the ^ uerprofils both the power supply of the Moisture meter and the discharge circuit of each discharge resistor is interrupted , so that the measured values obtained from the moisture meters at the time of measurement remain stored in the storage capacitors. 5. The method according to An _S p _rU ch 1 or 2, characterized in that the stored measured values of a measurement are queried one after the other in terms of the local sequence - 12 - 109809/1172 the moisture meter (3) and that each measured value for a sufficient period of time to a registration tool (6) is fed, the feed of the recording material is synchronized with the query of the measured values, so dess an external profile of the moisture content for each measurement the track (4) is recorded. 4. The method according to claim 1 or 2, characterized in that the gespr eicherten measured values of a measurement can be interrogated sequentially be supplied in accordance with the local sequence of the moisture meter ^) and for a sufficient period of a regulator which acts on the part of the web (4) to which the relevant moisture meter is assigned. 5. The method according to claim 1 or 2, characterized in that at the same time ait or separately τοη the recording of the transverse profile, the measured values are queried one after the other in such a rapid sequence and a recording instrument (7) is supplied, as a result of the inertia of this Registrlerinetruaente essentially the mean value the moisture content of the web (4) is recorded, while larger deviations from the mean value remain recognizable. 6. The method according to claim 2, characterized in that the sum of the currents flowing through the discharge resistors (17) is used to display the mean value of the moisture content. -13 - 109809/1172 ORIGINAL! NSPECTSD 7. Device for carrying out the method according to the Claims 1 to 6, characterized in that a preferably the number of the headlip lips ■ Paper machine corresponding number of moisture meters (3) transversely to the direction of movement of the web (4) lying next to one another and parallel to their plane a common carrier (1) is arranged and openings (28) for suction air are provided in the area thereof are, whereby the web (4 ·) is in contact with the moisture meters is held. 8. Device according to claim 7, characterized in that the moisture meter (3) in one substantially only to the web (4) open housings are arranged, the web facing, watch with the moisture meters the walls forming the openings (28) close at about the same height as the moisture meters and that the housing is connected to an exhaustor. 9. Device according to claim 8, characterized in that that the housing consists essentially of a double T-beam one side of which is covered and one side Air duct (30) forms for the suction air, while the moisture meter (3) are arranged on the other side. Neuwied, August 14, 1969 The representative jü £ L ^ S \ 10 ^ 809/1172 Blank page