DE2352374A1 - METHOD AND DEVICE FOR GENERATING A FIBER WEB - Google Patents

Description

DE, BBICH'SBUGBBAUK

PITINTUJWALI?

S MUKCHEN 2β - POSTI ¹ ACS SS

(»Seas» bib dsidsbkz

5 «8Ϊ2> 2S & 339« J.

?. October 1973

Procedures andl

β s ο h r © i '

Ö © OÄO

riehuagen sum

lichen gleisteiäBigea Sewicht 3®

@ 1s © h in the essence

Esmmugßn ®ine ^ Imesrfeato eis ©

gg Bahn a @ gw @ elsaliigs- | @a iadia ^ ea achieved ₉ fiaB man di © ®i "@ ht © d © 2? fssera aa © im®a Baakt regulates ₀ directly bm §, ®m Piaakt liegte aa w @ late.eii di @ fssara s

t®

Tarf aiirea un§, Torrioatiaagea sie a @ g®ls i © 2>. Bieh® aserbaM ¥ © rg @ selilag
lall @ia Saehteil j?

to at Ateai © tong @ a from
Baha g © a @ ss © a wirdU gg

Result this ©! ¹ Measurement of the M @ ng® ä @ s »s ^ geSöfertea Fas era

iy ± ra ₉ so iaS fier auf ä®n g © a @ ss®B @ a Seil i © ^ lseer = gö® 2 @ il als lolg® @iaer Ams§l @ i © fesaaSaaha © © ehwerer- oder lightes' weriia lsaaa _o Ib a @ Bey @ i? 2 @ it wiarS © eis® "

4ÖS819 /

be? proposed aserbahn tung sum Hegeln the lessons of a J, using rolls at äsr stuffing to loose]? assra in a Umacßlieiäung cram from which are for forming a Faserliahn needed fibers pulled} in this case serves a photoelektrisehe means for measuring the medium- ' sized Biehts the fibers in DER ümseiilieSung, and the rotational speed of the Stopfwelsen is to achieve increased einsr Ausgleicliswirkung or decreased to the amount of the inside stuffed into the enclosure 'fibers so to r @ g $ ln ₉ the ein® gleichmä £ ig @ Diohte the Fibers are maintained _s foeirey the ^ aserbahn is produced * However, it is necessary "with this known control device that the lasers are thoroughly opened" before they are stuffed into the enclosure so that the photoel'electric BlwirlGhtvMg the middle faces ä © r JaserE in the enclosure properly megggis can snseigen UNAE "Wirfi a photos-lektrische- device z ^ m measuring iiit tl®i ^T ? .n Melite used by J-asesn _s lies it ßisßsrilsE 'on the IaM ₅ asS see ü ± e aittlere BieMs of Ge

sii ans v®i-ssb_i @ a © nfai ⁵ Mgs & fassr-n is not perfect n, d & laseris ⁷ JoriiaEfi © a 3im.ä _f who are basüglioh äer

ption ¥ oa uad ito @ s E © fl®xi- © nsverjaögens under- = sehtidea »

The result lies «Li® Aiixgob® zugx-una® _s Ter ^ ahrsa li eMtißgeE ^ u scfeaffeEj you ss @ 2? AegIiol3, wE ₃ the density" a zn produaaass Fasar-balm. EaeHEsii sii i ^ egela ^ dsS the Dioiite of lasers τογ den ■ BiM © m äes ¹ faegrsalni regulated ^ ir

^?> γ without fiSekfieirfe äar &'Kf _r © Is mil © Pagtg ^ m dig f lsi ehe fe haben, ο &®τ> TsrsGhieasaferBig i; ± Hä ₉ n «d without §sj © ε © s is necessary, clif ^; Isserzi v © r üir © r- ¥ © rar "öeitiii2g sii ein.®? Fiber web grliasiieli. Sis öffaaE« ferasr © iae Segs a laserfeaha dsi-areli sta ossSgliotisK ^ dai dis PaserzL gate to the formation of the r-aserbahii, on gefliir. lt Mus he

jre ¥ erfafc, i? es iiM iQT ^ toh ^ imM & s. m & sefeaffea

^^ iii it GE

lent »loose fibers sn a pasg

40S819 / 0289

uniform density, in which a mass of loose fibers "is fed through a chute through a perforated or permeable outer surface of a rotating sealing drum dad-arch * so that the fiber mass is picked up by two rotating feed rollers, which are located near the entrance of the Chutes are arranged in order to convey the fiber mass from the feed rollers through a narrowing channel which ends in a Paser density regulating zone extending along the regulating drum, "in which the fibers are compressed in a condensing zone adjoining the regulating zone and against the permeable circumferential surface of the Yerdichtungtrommel are advanced, and in which the density of the fiber mass fed to the compression zone is controlled by the fact that a suction air flow is passed through the control zone into the compression drum to suck fibers from the control zone in the direction of the compression drum so that they can pass through the compression drum sealing drum are conveyed in the forward direction to the compaction zone. Furthermore, facilities have been created by the invention that serve to feel changes in the negative pressures brought into effect, which are due to deviations in the density of the fiber mass in the control zone compared to a predetermined target value, and which also enable ₉ through the compression drum hindurehgeforderte Baugluftmenge in response to the sensed deviations of the negative pressure from the target value so as to "rectify ₅ äaß the orbiting Verdiehtungstrommel from the Eegelsone gleickmäSige lasermengea removes _s to derive in the compression zone a laser web τοη substantially gleielamäßiger Dickte% n-producing

The invention and advantageous details © eggs Erfiia- äung be explained in the following anhaad sciKsmatiseher% ® ± ®hnwigGn to one Ausföiiriangsbeispiel ■ in more detail zeigts

Eigo 1 a schematic diagram of G-runäriS several'r! Eesrciiiiaseiiines zum Yerarbeitaü vöh Paserii ₉ each of which is assigned to a device for the production of a fiber path.

2 is an enlarged side view, partially drawn in vertical section, of part of one of the fiber processing machines according to Fig. 1, which is a card, the section along the line 2-2 runs in Fig. 1, and in connection with the card a preferred embodiment of a device for generating a fiber web is shown partly in a side view and partly in section;

3 shows a partial section drawn on an even larger scale through the lower part of the device Fig. 2 for producing a fiber webj and

FIG. 4 shows a schematic representation of the drive connections between a lickerin roller of the card according to FIG. 2 and the compaction drum as well as the adjacent rollers of the device for producing a fiber web.

1 shows the application of the invention to several textile machines for processing fibers set up in a row, each of these machines being of a known type a clutter? a fiber opener, a fiber mixer, a machine for felting fibers or a needling machine. In the present case, Fig. 1 and 2 show machines, each of which is a total of 10 designated card? Each card is a fiber web which is produced by an associated device according to the invention, via a revolving driven feed roller 11, in order to be processed in a known manner by a licker-in 12, a main card drum 13 and a take-off roller 14 to form a card pile, which is then introduced into an Eanne through a rotary pot 15 of a known type.

'2-emäß be Figa 1! Fibers in loose form the various carding' IQ from a fiber source 20 -made by a "! Ransport- 'and allocation distribution device 21, which is

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be a conveyor belt "of a known type with driver rake or a pneumatic conveying device, which" comes into effect in a known manner "to guide a loeker® laser compound essentially upright arranged chutes 23, each of which has one on the back of each card 10" For each slide 23 _s which can be designed in the "known way"? include opposing side walls 23a and 23b ₉ between which an upper front land 23c and an upper rear wall 25d extend. On walls 23c and 25ö. In vibrations removable bottom walls are aligned 23e and 23f, the one in the we-s ent loan vertically extending channel delimit _s along which is the channel led by the conveyor 21, the cited loose Faseraasse moved together with the top walls ". The lower walls 23® and 23f can be made to vibrate in a known manner, not shown in IPige 2, in order to prevent the downward movement of the fibers in the slide 23 under the action of gravity

According Mg. 2 and 3 are front and rear wall © 23CS 23® and 23d, 23f b against the front wall a or _o the rear wall of the housing of the chute 23 nacii offset inwards ₉ and on the lower part of the front Gehäusewaad a closes a circular arc curved Ifand is & bsehnitt c adjacent to _s dex ^"2 of the permeable peripheral surface or wall 24 of a circumferential Yerdichtungstrommel 24 * piping Tercichtungs = drum extends substantially on · Gamse width of the carding machine 10 or at least on the entirely © width of the to be produced iaserbahn _s and the lower Ranfi öes curved wall "= C portion forms in the substantial rear or upper boundary of a laserdiemteregelsone G _9, the wall of the upper at its upper or rear end also through the front end 25a of a channel is demarcated 25 _o in Figo 5 is and the bottom wall 25b of the channel 25 to recognize! on beiaea Torrichtung sides of the channel 25 by the lower parts of the mutually gegenü Overlying side walls 23a and 23b of the slide 23 completed.

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The channel 25 serves to guide the fiber material from the lower band of the chute 23 to the permeable circumferential surface 24a of the circumferential compression flow 24-, and the upper part 25a of the channel runs essentially tangentially to the circumferential surface of the expansion tunnel 24 and extends with it increasing distance from the Yerdichtungs- ■ fcromioel upwardly therefrom. the bottom wall 25b of the Eanals 25 is arranged at a distance from the upper wall 25a and at an angle thereto, and extends along a erheolichen distance across the lower edge of the upper wall 25a addition, so that it a significant portion of the umfangsf pool of Yerdiohtungstrommel 24 opposes _s to the lower wall of Bisiiteregelzone G ο to form thus limiting the channel 25 together with the permeable peripheral surface 24a of the YerdichtuEgstroffimel 24 a is üJo®r the ganse I. Along the length of the earning drum, the channel 25 mimics a, vt ^ n n tiä imteii convergent opening that ends at the laserdiolit-sregelzo-n © G. Samit II ^T Oer the Eutssh moved © 23 augefülirte lceksre fiber mass in HisMniag on the permeable Ilmfaagsfläehe 24a of the orbiting Yerdichtungstrommel? FIRD _s viird the fiber mass of SWEi separated by a distance circulating transport orphan 25 and 27 _s detects the nateren near the end of the hat see 23 us are arranged at the entrance of the channel 25.

ffeaäß I? ig «2 is an Einriolitiiag sum Indians of the Drshzalil tzw. an adjustable üetrieöe 30 available, which with the E-ransportwalzen 26 and. 27 that the power transmission device 31 is coupled, until the drive shaft of the adjustable gearbox 3ö can be driven by an electric motor 52 or the like *. S ^ eekinäSig can AEAs adjustable gearbox 30 and in accordance lig _s arrange the motor 32 on 2 ä © r EiielcwaM fc of the housing of Hutsehe 23 »

To the fiber die htereg © lson © ö see aiiis fiber "web formation and Terdiehuagsson® D sa, zn belong to the equipment, which serve to _s the of the circumferential Ysrdichtu.ags-

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drum 24 in the direction of rotation entrained lasers to compact by pressing it against the Yerdiehtungstrommel. To this . According to Pig. 5 elne ^ rear pressure roller 34, a curved pressure plate 35 and a front or lower pressure and / or delivery roller 36 _? which come into effect in the order in which they are mentioned. There is a distance between the adjacent surfaces of the sealing drum 24 and the pressure roller 34 which is slightly smaller than the distance between the lower wall 25b of the channel 25 and the lower part of the peripheral surface of the sealing drum 24? and the lower discharge roller 36 is preferably somewhat closer to the lower part of the peripheral surface of the stretching drum 24 than the pressure orbital 34. The curved pressure plate 35 preferably extends between the upper parts of the peripheral surface of the two rollers 34 and 34

36 and tangential to it, so that the pressure plate is arranged is that it is attached to the lower rope of the circumferential surface of the The sealing drum 24 gradually approaches further Expansion zone D progressively compacted fibers, until they run over the lower delivery roller 36 «, Mit the lower discharge roller 36 operates in an upper doffing manner

37 together, the circumferential surface with the permeable XJmfangsfläche the sealing drum 24 cooperates and rotates at the same peripheral speed as the Yeräicirfnings » drum to get the compacted Saserbahn L from the Yerdichtnag drum 24 -to be lifted off and fed to the feed roller 11 of the card 10 via an inclined guide plate 40.

As mentioned _? The outer lower rim of the curved WaM part e of the ß-ehäuses of the Hutsche 25 essentially forms the master or upper limit of the Paser density control zone G on the permeable peripheral surface or wall 24a of the drum 24 ο For this purpose the wall part ο the Krüisisiisg of the circumferential surface of the sealing drum essentially to = »fitted _s - and it works together with an upper rear part of the sealing tube. The lower rope of the front wall a

409819/0289

of the housing of the slide 23 forms the rear wall of a tension chamber where it merges into the curved wall part c 41 which encloses the upper part of the compaction drum 24 arranged in it. The expansion chamber conveyor wall 41a 41 is provided with a seal 42 which cooperates with the peripheral surface of the compaction drum 24, to essentially prevent air from zv / ischen the wall 41a and the circumferential surface of the compaction drum flows inward where the compacted Paserbahn L is lifted from the compacting drum 24. Furthermore, in the Compaction drum 24 has a stationary shielding part 43 which is curved in the shape of an arc of a circle on its outside, the outer surface of which is substantially matched to the inner surface of the permeable wall 24a of the compaction drum. The curved one The surface of the shielding part 43 extends over such an angular range along the circumference of the compaction drum, that the flow of air into the compression drum between the compression zone D and the lower Edge of the rear wall 41a of the expansion chamber 41 is prevented in order to additionally contribute to the removal rollers 36 and 37 the compacted fiber web from the circumference 24a of the compaction drum can lift off. For the rest, the compaction drum 24 can generally be formed in a known manner so that a more detailed explanation should be unnecessary. The ends of the compaction drum 24 are conventional Completed way by end walls 24b, only one of which can be seen in FIGS. 2 and 3.

Each expansion chamber 41 of the various cards 10 is followed by a branch or air duct 45, which one as part of the relaxation kasmer in question can look at. Each of the branch channels 45 extends upward and is in communication with a common channel 46 ("Pig. 2), which is part of a device for generating a negative pressure, e.g. a suction fan 47, which according to Pig. 1 can be assigned to all cards 10 together. Naturally however, each individual fiber

409819/0289

Processing machine 10 with its own suction fan or like. be equipped. The suction device 47 causes that! S A suction air flow moves through the channel 25 and the fiber density control zone C, in order to enter the compression drum, as shown in FIG 24 to enter. According to FIG. 3, the suction air flow naturally moves upwards through the upper part of the Compression drum, expansion chamber 41 and channels 45 and 46 to suction device 47. ' The neighboring ones Edges of the pressure plate 35 and the lower wall 25b of the channel 25 can be at a certain distance from the pressure roller 34 be arranged so that air can flow into the outlet end of the fiber density control zone G. If necessary, can In addition, the lower wall 25b of the channel 25 be perforated or porous so that air can enter through the wall 25b, in the direction of the compaction drum 24 in the fiber density control zone " G to flow c

4 dis is drivable in a known manner Feed roller 11 of the card 10 in drive connection with the Compaction drum 24, the pressure rollers 34 and 36 for forming the fiber web and the take-off roller 37, in such a way that the compaction drum 24 and the rollers 34, 36 and 37 rotate at substantially the same constant peripheral speed. Will the density of the fibers at the outlet of the Control zone G is kept constant, so is the amount of fiber transferred to the compaction zone D by the rotating compaction drum 24 and the pressure rollers 34 and 36 is fed, remain constant, so that a fiber web of substantially uniform density is generated, which is removed from the compaction drum through the Y / rollers 36 and 37.

Maintaining a substantially uniform density of fibers in control zone G is a facility which serves to feel the changes in the negative pressure caused by changes in the density of the fiber mass in the Control zone G are caused and represent deviations from a predetermined target value for the density? the flow

409819/0239

speed of the extracted air and 'the peripheral speed the (transport rollers 26 and 27 are then corresponding the perceived changes in the negative pressure to compensate ao varies that practically a substantially constant negative pressure in the compression drum 24 and thus also in the direction of flow upstream of the control zone G and the compression zone D is maintained during the entire operating time of the device. According to the middle part of Mg. 2 is each branch channel 45 with a manually adjustable vacuum sensing device 50 of any known type provided, which can be adjusted to changes in the negative pressure in both directions from the predetermined optimum Negative pressure in the branch line 45 concerned feel. Since such pressure sensing devices are known, a more detailed description should be superfluous. For example, can a device of known type 3 is used as pressure sensing device 50, that is available under the legally protected name "Photohelic", Series 3000, and as a switching device Pressure gauge is formed; this device is in the pamphlet B-33 available from Dwyer Instruments, Inc., Post Office Box 373, Michigan City, Indiana, 46360, V.3t.A., was issued. The device includes a pressure sensing and transmission pipe 50a, which is connected to the device 50, through one of the end walls 24b of the compaction drum and with its open end inside the compaction drum flows out.

Each pressure sensing device 50 is in electrical communication with two servomotors 51 and 52. The servomotor 51 is in drive connection with an Luftventilkö'rper 53, which is arranged in the main suction channel 46 and aligned with the associated branch channel 45 that it opens this channel and can close in order to regulate the effective passage cross-section at the upper end of the associated branch line. The servomotor 52 is coupled to a speed setting arm 54 of the adjustable gear 30 so that it can be used to increase the output speed of the adjustable 3e

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drive and thus also the speed of the transport rollers 26 and 27 to vary compared to the input speed of the transmission driven by the motor 32.

As described above, the invention provides an improved method and apparatus which enables loose fibers to be formed into a fiber web of substantially uniform density and to process with an essentially uniform weight per unit of length? according to the invention is a loose Fiber mass through the associated chute 23 and to the permeable peripheral surface or wall 24a of the rotating compaction drum 24 promoted in that the fiber mass is detected by the two revolving transport rollers 26 and 27, the are arranged near the exit end of the slide 23. The! Transportwalzeη 26 and 27 promote the fiber mass through the narrowing channel 25 »which ends at the fiber density control zone G, which extends between the front part of the lower Wall 2i? B of the channel 25 and a part of the permeable peripheral surface 24a of the compaction drum 24 extends. The fibers are compacted in contact with the circulating permeable 7 / and the compaction drum in compaction zone D, which practically follows the rule zone C, and the The density of the fiber mass is regulated in the control zone G in that a suction air flow is passed through the control zones and into the compaction drum is introduced to remove fibers from the Aspirate the control zone and move it towards the compaction drum so that it can pass through the compaction drum. be transferred to the compression zone D. At the same time feels the sensing device 50 all changes in the negative pressure caused by changes in the amount of fiber in the control zone C as opposed to a predetermined target value of the density are caused, so that the suction air flow rate as well as the peripheral speed the trolleys 26 and 27 depending on the changes felt by the Einrieh device 50 so varied be that the rotating compaction drum from the.

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Control zone 0 continuously removes even amounts of fiber and it feeds the compression zone D, where a fiber web of iron of uniform density is produced from the fibers.

During the operation of the device according to the invention, the channel 25 serves as a storage container for fibers that out of control zone C towards that part of the permeable wall 24a moving in the forward direction the compaction drum 24, which is the control zone passes through. If the negative pressure in the compression drum increases beyond the predetermined nominal value, this is the case an indication that too much fiber has been brought into abutment against the peripheral surface of the sealing drum is. However, the ferry device 50 and the valve body 53 then immediately reduce the flow rate the suctioned calls to reduce the negative pressure briefly so that the excess fibers no longer come through the negative pressure held in the resulting fiber web will. If, on the other hand, there is an undesirable pressure drop in the compression drum 24, there is only an inadequate one Amount of fiber reaches the Yerdichtungstroimnel 24, cause the sensing device 50 and the valve body 53 that the flow rate the extracted air is increased immediately so that an appropriate amount of fiber is used to compensate is sucked against the compaction drum; this has the consequence that the negative pressure reaches its target value again, as soon as the correct amount of fiber has deposited on the sealing drum, so that that formed in the compression zone D. Fiber web receives the desired density.

All information and features disclosed in the documents, in particular the disclosed spatial design, are as far as they are individually or in combination new compared to the state of the art, claimed as essential to the invention.

Expectations:

409819/0289

Claims (1)

EXPECTATIONS Iy method, a loose Faserraasse from one side against a check moving perforated or _o-permeable surface is performed for processing loose fibers into a fibrous web of substantially gleiohmässiger density _a wherein ,, while a suction air stream from the above-mentioned one side to the other side of the permeable surface is passed through this surface * to bring parts of the fiber race to rest on the surface ^ so that they are transported through the moving surface ^ thereby geke η η ~ indicates ^ that the amount of air sucked through the moving surface per unit of time Depending on the perceived changes in the suppression prevailing on the other side of the surface caused by changes in the density of the fiber mass brought into contact with the surface ^ to compensate for these changes is varied ^ so that the moving surface carries with it even amounts of fiber in its direction of movement * from which a Fas is formed with a substantially uniform density «, 2ο method of claim _s l characterized in ^ that the perforated or "permeable surface, the peripheral surface of a rotating Verdiehtungstrommel is _fl of the loose mass of fibers is fed through a chute characterized * that it is detected by two rotating transport rollers which are arranged near the exit end of the chute are so that the fiber race through the transport rollers through a 403819/0289 converging channel is promoted, which is in a longitudinal the Paserdiohteregelzone extending over the Yerdehungstronrasl opens out that the fibers in contact with the circumferential permeable circumferential surface of the drum in one to the adjacent End of the subsequent compression zone be compressed and transported further. 3. The method according to claim 2 _S claöiirch characterized, äass to compensate for deviations, the rotational speed of the transport rollers depending on the perceived deviations of the negative pressure from a predetermined target value is varied ₅ to contribute to the formation of a fiber web with the desired, substantially uniform density «, 4. Device for carrying out the method according to one of the claims 1 to JSc ^ it one ^ Rutsehe for taking up a loose fiber mass ", a rotatable compacting device with a substantially cylindrical, perforated or _a permeable hand, a channel for feeding in fibers the slide to the compaction drum, which together with the permeable wall delimits a fiber density control zone extending along the compaction drum, by a distance separated transport rollers arranged near the outlet end of the chute for transferring fibers from the chute into the channel, a device for generating a suction air flow, the flows through the fiber density control zone and enters the compression flow tube, as well as facilities for compressing the fibers in the plant adjacent to the exit end of the fiber density control zone 409819/0289 on the circumferential surface of the compaction drum for forming a fiber web, characterized in that a device (50) is present which senses changes in the negative pressure which can be traced back to deviations in the density of the fibers in the fiber density control zone (C) compared to a predetermined target value are, and that devices (51 » 55) are present * which are operated by the sensing device for changes in the negative pressure in order to compensate for these changes, the amount of suction air passed through the fiber density control zone and the compaction drum (24) per unit of time, so that the compaction drum the fiber density control zone constantly takes along essentially uniform amounts of fibers and feeds them to the compression devices (34, 35 * 36) so that a fiber web of essentially uniform density is formed. 5ο device according to claim k _s characterized by devices (32, 30, 31) zxsm driving the transport rollers (26, 27) and a device (52) in operational connection with the drive devices, which is controlled by the device (50) for sensing changes of the negative pressure is actuated in order to compensate for these changes to vary the speed of rotation of the transport rollers and thereby contribute to the formation of a paserbahn of substantially uniform density. 6 _E Device according to Claim 5, characterized in that, in addition to the devices for driving the transport rollers (26, 27), there is a device (30) in drive connection with the transport rollers for varying the speed 409819/0289 heard. 7. Apparatus according to claim 6, characterized in that the devices for compression of the fibers in contact with the wall (24a) of the compaction drum (24) includes at least one pressure roller (34, 36) which in is arranged at a distance from the compaction drum, the However, the distance from the compaction drum is considerably smaller than the distance between the rotatable transport rollers (26, 27), and that at least one of the pressure rollers is at the exit end the paser density control zone (C) is adjacent. 8. The device according to claim 4, characterized in that the axis of rotation of the compression drum (24) extends substantially horizontally that too the channel (25) has a lower wall part (25b) which is at a distance from the permeable V / and (24b) of the compaction drum extending up and away from below part of the compaction drum, and that to the channel one in close proximity to the permeable wall of the compaction drum arranged upper wall part (25a) belongs. 9 · - Device according to claim 4, characterized in that devices (46, 45) are present, which connect the device (47) for generating a negative pressure with the compaction drum (24), and that to the through the sensing device (50) actuatable devices a valve body (53) or the like. Belongs in the connection between the device for generating a negative pressure and the 409819/0289 * r 4 Compression drum is arranged and serves to the air flow, to regulate, which moves from the compaction drum to the device for generating the negative pressure. 409819/0289