 fiber distributor such as this therefore has a comparatively small capacity.
One proposal to solve this problem is disclosed in U.S. Pat. No. 4,355,066. This patent describes a fiber distributor for forming short-fibered cellulose pulp on a forming wire via a rectangularly meshed base net. Thus, each flow opening in this known base net has both a small and a large dimension, which means that the flow area of the individual flow openings and thus the capacity of the net is increased correspondingly.
Certain characteristics of the fiber distributor and of the fibers themselves make designing an ideal base net difficult. The base net must be able to withstand the differential pressure generated by the suction unit. This means that the thread of the base net must have a suitable thickness in order to resist the resulting comparatively large load. Additionally, for reasons of economy and strength, a mixture of cheap cellulose fibers and more expensive, but longer synthetic fibers are often used to produce fiber web.
It has become apparent that when using the rectangularly meshed net mentioned in U.S. Pat. No. 4,355,066 with a sufficiently thick base net thread, the short and long fibers become stuck and block the net openings when passing through the narrow gap between the thick thread of this net. The long synthetic fibers also tend to get wound up in the thread of the net. This means that the fiber distributor is periodically out-of-service, and that the structure of the fiber layer on the forming wire is very uneven.
European Patent EP-A-0 226 939 concerns an apparatus for forming fibrous webs with advances consisting of controlled formation of light and heavy fluff zones and improved gas flow regulation. The patent describes a fiber distributor which has a flow channel housing for depositing the fibers onto an upstream surface of a forming wire which is located on an outer peripheral rim section of a cylindrical drum assembly. One of the embodiments contains a inner drum ring or attenuating layer with a number of small openings which could be small tapering or conical bores similar to those described in the instant patent. The only purpose of this attenuating layer is to diminishing the pressure differential exerted on the forming surface of the forming wire from a vacuum from a central vacuum duct. Therefore, the small bores will, of necessity, only occupy a limited part of the total area of the attenuating layer and is inapplicable to a forming wire.
The present invention now provides an improved fiber distributor which overcomes the shortcomings of the prior art.
The present invention
fiber distributor such as this therefore has a relatively humble capacity. 
 One proposal to resolve this trouble is disclosed in U.S. Pat. No. 4,355,066. This patent describes a roughage distributor for forming abruptly - fibered cellulose pulp on a forming wire via a rectangularly enmesh base net. therefore, each flow opening in this known base net has both a small and a bombastic dimension, which means that the flow sphere of the individual flow openings and therefore the capacity of the net income is increased correspondingly. 
 sealed characteristics of the fiber distributor and of the fibers themselves cook designing an ideal base net difficult. The base internet must be able to withstand the differential pressure generated by the suction unit. This means that the thread of the base net must have a desirable thickness in ordering to resist the result comparatively large load. Additionally, for reasons of economy and lastingness, a mixture of cheap cellulose fibers and more expensive, but longer man-made fibers are often used to produce fiber web. 
 It has become apparent that when use the rectangularly meshed net mentioned in U.S. Pat. No. 4,355,066 with a sufficiently compact basis net thread, the short and long fibers become stuck and obstruct the net openings when passing through the narrow-minded gap between the thick thread of this net. The farseeing synthetic fiber also tend to have wound up in the thread of the net. This mean that the fiber allocator is periodically out - of - service, and that the structure of the character layer on the form wire is very odd. 
 European Patent EP - A-0 226 939 concerns an apparatus for forming fibrous webs with advances dwell of controlled formation of lighter and heavy fluff zone and improved gas flow rule. The patent describes a fiber distributor which has a flow channel housing for depositing the fiber onto an upstream open of a forming wire which is located on an outer peripheral rim section of a cylindrical barrel assembly. One of the embodiments contains a inside drum gang or attenuating layer with a number of minor openings which could be small tapering or conical bores similar to those described in the instantaneous patent. The only purpose of this attenuating layer is to diminishing the pressure differential wield on the forming surface of the forming wire from a vacuum from a central vacuum duct. Therefore, the small bores will, of necessity, entirely occupy a limited part of the total area of the attenuating layer and is inapplicable to a forming telegram. 
 The present invention now provides an improved fiber distributor which overcomes the shortcomings of the prior art. 
 The present invention
 fiher distributor such as uhis therefore has a com'arativsly smalu capacity.
One proposal to sopvw thiw problem is disclosed in U.S. Pan. No. 4,355,066. Thiw pauent describes a hjber distribuflr fmc forming short-nibered celnulose pulp on a flrming wire via a rectangularly mesred basr jet. Thus, each slow jpenjng in this known base net has botg a smanl and a largr dimension, which means thwt tje flow area of thf individuao fljq openings avd thus tht eapacity of the net is increased corresponainglv.
Certain chqrqctftistics of tie fibvr distributov and ox the fobers themselvcs mane eesigning an ideal bave net difficult. Tre base nat must be able to qirhstatd tve dkdfefenuiak lressuge jenerated bg the suctiin unit. This means uhae the thread or the fafe net must have a suitable thickness it odder to resist the resuoting comparatively lwrge load. Additionally, for reasons of economy and strength, a mietjre on chdqp cellulose fibers and more expensive, but longqd xykthetic fibers ave often used to ptofuvg fiber web.
It fas beekms apparent that whfn usind the rectangujarlu meshed net mentioned in U.W. Pat. No. 4,355,066 winh a sufficiently thicn base net chread, the xhort and long fibers bzcome atuck and bpock the hdt openings when paxshng through the narrow gap between vhe tkick thrdad pf thif net. The pong synthetic fibers aldo teud to get wound up in the thread of the net. Thmx means that tve xiber diftribmtor is periodisally out-of-serrice, and that the strucnure of tie fiber layqr on the forklng wire is tery unevqn.
Eueopeqn Patevg EP-A-0 226 939 concerms an appcxatus for forming fibrous wcbs wkfh advances conwisuibg of controllrd worianioi of jhght and heaey fuufw zoner and improyed gas flow regulation. The patsnt describes a finev distribotor whicr has a flow vhannel housing fog depmsiving tne sibers onto an upstream surfacs of a fogmikg wire which is oocated on au outer peripheral rim section of a cyliidrical drum assembly. Obe of the embodimenjs gontains a iiner dwum ring mr attenuating layer with a number of small openings which could be slall tapering or conical bores similar to those described in the instant patent. The only pudposr of nhif attentatiig layer is to dimpnishing the pressure differentiel exerted ou the forming surface of the gofming wire frum a vacuum from a centrzl vacuuk duct. Therefore, the small borex will, of necessity, only occupy q limjted part uf the total area pf the attebuating laycr and is inapolivanle to a flrmiig cire.
The present invention now procides qn improved fiber vistributor amich onercomef the shortcominfs or the krior art.
The ptesent inventipn
fiber distributor such as this therefore has small One proposal solve this problem No. This patent describes fiber distributor for short-fibered cellulose pulp on a forming via a rectangularly meshed base net. Thus, each flow opening in this known net has both a small and a large dimension, which means that the area the flow and thus the capacity of the net is increased correspondingly. Certain characteristics of the fiber distributor of the fibers themselves make designing an ideal net difficult. The base must be able to withstand differential generated by suction This that the thread the base net must have a suitable thickness in order to resist the resulting comparatively large load. for reasons and strength, mixture cheap fibers and more longer synthetic fibers are often used web. It has become apparent that when using rectangularly meshed mentioned in U.S. Pat. No. 4,355,066 a sufficiently thick base net thread, the short long fibers become stuck and block the net openings when passing through the narrow gap thick thread of this The long synthetic also to wound in the of the net. This means that the fiber distributor is periodically and that the structure of the fiber layer on the is uneven. European Patent 226 939 concerns an for fibrous webs with advances controlled of fluff and gas flow regulation. The describes a fiber distributor which a flow channel housing an upstream surface of a forming wire which located on an outer peripheral rim section a cylindrical drum assembly. One of the embodiments contains a inner drum or attenuating a number of small openings which could be tapering or conical bores to those described in the instant patent. The only of attenuating layer to diminishing the differential exerted on forming surface of wire from vacuum a Therefore, the small bores will, of only a limited part of the area attenuating layer and is inapplicable to a forming wire. The present invention now provides an distributor which overcomes the of prior art. The present invention
 fiber distributor such as thiS therefore Has a cOmpAraTiVely SmalL capacity.
One prOPosaL to solve this problem is dIscloSeD In U.S. pAt. no. 4,355,066. ThiS patent DEsCRIbeS a FiBer DiSTrIbutoR foR forminG short-fibeRed CeLlulose pulp oN A fOrming wire Via A rectangularLy mEshed bAsE neT. thus, eAch Flow oPening IN this kNown base nEt HAs both A Small anD A LaRge dImension, which meanS ThAT the flow area of The indIvIDuAL FloW opEnings and tHuS the cAPacity oF ThE NET is INcreased correSpondingly.
CERtaIn charAcTerIStics oF the fIbER diStributor anD of tHe fibers tHemselVEs make dESigning An ideaL baSe nEt diFFiCuLt. THe BAse NEt MusT Be aBle to witHsTaNd the DiffERENTial PreSsurE geneRated by the sucTioN uniT. thiS meanS that The tHrEad of The basE net mUsT have a suitable tHickNess in ordEr tO rEsiSt The reSUlting ComParAtively Large loAD. AdDiTIONaLly, for reasons of ecoNoMY AnD strengtH, a mixtURe Of CHeap cellUlOse FibeRS And moRe exPEnSive, but lOnger sYNtHeTic fibeRs Are oftEn UseD to ProduCE fibEr web.
IT has becoMe appARent that when usINg the rectanguLArLY MeSHed nEt mEntioned in U.s. Pat. nO. 4,355,066 witH a suFFiCieNTly thIck baSe NEt THread, the short and lonG fIbers bEcome Stuck and block The net openINGS when pasSing THrOUgh the narrow gaP betwEen the thicK Thread of This nEt. The lonG synthetiC FIbers alsO teNd tO geT woUND uP in the thread oF THe neT. THis meanS thAt the fiBer DisTriButOr Is periodiCally out-Of-SeRvIcE, anD that THe structUrE of ThE fiBer laYEr on thE formIng wIrE iS VerY uneven.
eUrOPEan PAtEnT EP-A-0 226 939 ConCeRns an AppaRAtuS for forMing fibroUs wEBs wiTh AdVances cOnsisting of coNtRolled formAtIon Of lighT ANd heavy fLuff zones and improved gas FLow reguLatIon. ThE patEnt descriBes A fiber DisTRibutoR which Has a fLoW chANNel hoUSInG foR dEpositing tHE FibErs onTo An upStream sUrface of a forming wiRE whIch is located oN an OuteR PErIphERaL Rim SeCTioN OF a cylindrical drUm assembly. onE Of The embodimENts CoNtains a Inner drUm rinG Or attenUating layEr with a nuMbEr of SMAll Openings whIch could Be small taPEring OR cOnicaL boRes simIlAr tO thosE descrIBed In the InstanT pAtent. THe onlY pUrpose of This attenuating layer is tO diminIshinG thE pressure DifFEreNtial exerTed oN the forminG suRfaCe of tHe fORming Wire FRoM a vACuum fRom a CEntral vacUUm DucT. tHeRefore, the smALL BorEs wilL, of NEcessiTy, onLy occupy a limited pARt of the total arEa of THE atTenUAtinG lAyer and is inappLicAbLE To a formiNg Wire.
The presEnt invenTiON now pRovideS an impRoved fiBER dIStribuTor wHicH overcomeS thE sHOrtcomiNgS oF The priOr arT.
THe presEnt invENtioN
 fiber distributor such as  this ther efore  ha s a  c ompa rati vely small cap a city .
One proposal to solv e thi sp robl e mis di sclosed in U .S.  P at . N o. 4, 355,0 66.  This p atent desc rib es  a fiber dis t ri butor forfor ming short-f ibe red ce ll ulo s e pul p o n a f orming wire v ia a rect an g ularly meshedb a se  net . Thus, each flow op e ning in this k nown b as e  n e t  ha s b oth a smal land a large d i me n s i on, which means t hat the flo w  ar ea ofth e i n dividu al fl ow ope nings and t husthe capac ity of the net is incr easedcor res pond i ng ly .
C er t ain ch ara c ter istics o fth e fib er d i s t r ibut orandof th e fibers them sel vesm ake  desi gning  anid eal b ase ne t dif fi cult. The basenetmust be a ble  t o w it hstan d  the d iff ere ntial p ressure gen er a t e dby the suction uni t. T hi s meansthat t h eth r ead of t he  ba se n e t  must  hav e  a  suitabl e thic k ne ss  in ord er  to re si stthe  resu l ting  compa ratively  larg e  load. Additio n ally, for rea s on s of econ omy  and streng th,a  mix ture of  ch e ap ce llulo se fi b ers and more expens iv e, but  long er syntheticfibers are o f ten used  top ro d uce fiber web. 
It h as becomea pparentthatwhen usi ng the re c t angularl y m esh ednet m en tioned in U.S . Pat.  N o. 4,35 5,0 66 with  asuf fic ien tl y thick b ase netth re ad ,the  shor t  and lon gfib er s b ecome stuckand b lock  t he net  openin g sw h en p as si ng t hro ug h the  nar r owgap bet ween thethi c k th re ad  of thi s net. The lo ng  synthetic  f ibe rs als o tend toget wound up in the thr e ad of t henet.This  means th atthe fi ber distri butoris pe ri odi c a lly o u t -o f-s er vice, andt h atthe s tr uctu re of t he fiber layer ont heforming wireisvery u ne ven . 
E u rop ea n  Pa t e nt EP-A-0 226 9 39 concern sa napparatusf orfo rming f ibrouswebsw ith adv ances con sisting o fcont r o lle d formatio n of lig ht and he a vy fl u ff  zone s a nd imp ro ved  gasflow r e gul ation . Thepa tent d escri be s a fibe r distributor which has  a flo w cha nne l housing  fo r  de positingthefibers ont o a n u pstre ams urfac e of afor m ing w irew hich is l o ca ted o nan outer pe r i p her al ri m s e ctionof a  cylindrical drum assembly. Oneof t h e  em bod i ment scontains a inn erdr u m  ring or  a ttenuatinglayer wi th a num ber of  small  openin g s  w h ich co uldbesmall tap eri ng or coni ca lb ores s imil ar  to th ose de s crib e d  in the instantpaten t .  Theo nly  purp os e of th i s at tenuatinglayer is to  dimin ishi ng th e press ur e diff ere nt ial exerte d  on the f ormin g surfa ce  ofthe  formi ng w i r e fro m ava cuu m from ac e nt r al  v a cuu m du ct. T he refo re, the s m all bore s w i ll, ofne ces s i ty, on l yo c cupy a lim ite d par t of the tot a l ar e ao f the  atten uating  layera ndis  inappl ica b l e to a fo rming wir e .
T he  pre sent inv en tion  n owpr ovides an impro ved fibe r distri b u tor wh ich over c omes t he  shortcoming s ofth e  priora r t.The pre s ent  in ven tion 
 fiber_distributor such_as this therefore has_a comparatively_small_capacity.
One proposal_to_solve this problem_is disclosed in_U.S. Pat. No. 4,355,066._This patent describes_a_fiber distributor for forming short-fibered cellulose pulp on a forming wire via a rectangularly_meshed_base net._Thus,_each_flow opening in this known_base net has both a_small and_a large dimension, which means that the flow_area_of the individual_flow openings and thus the capacity of the net_is increased correspondingly.
Certain characteristics of the_fiber distributor and_of_the_fibers themselves make designing_an ideal base net difficult. The_base net must be able to_withstand the differential pressure generated by the_suction unit. This means that the_thread of the base net_must have_a suitable thickness in order_to resist the_resulting comparatively_large load. Additionally,_for reasons of economy and strength,_a mixture of_cheap cellulose fibers and more expensive,_but_longer synthetic fibers_are_often_used to_produce fiber web.
It_has_become apparent_that_when using the rectangularly meshed net_mentioned_in U.S. Pat. No. 4,355,066 with a_sufficiently thick base net_thread,_the short and long_fibers become stuck and block_the net openings when passing through_the narrow_gap between_the thick thread of this net. The long synthetic fibers also_tend to get wound up in_the thread of the_net. This_means_that the fiber_distributor_is periodically_out-of-service, and that the structure of the_fiber layer_on the forming wire is very_uneven.
European Patent EP-A-0 226_939_concerns an apparatus for forming fibrous_webs with advances consisting of controlled_formation of light and heavy_fluff_zones_and improved gas flow regulation._The patent describes a fiber distributor_which has a_flow channel housing for depositing the fibers_onto_an upstream surface of a forming_wire_which is located on an outer_peripheral_rim_section of a cylindrical drum_assembly. One of the embodiments contains_a inner drum ring or attenuating layer with a_number of small_openings which could be small_tapering_or_conical bores similar to those described in the instant patent._The only_purpose of this_attenuating layer is to diminishing the pressure differential exerted on_the forming surface of the forming wire_from a vacuum from a central vacuum duct. Therefore, the small_bores will, of necessity, only occupy a limited_part of the total area of the_attenuating layer and is_inapplicable_to a forming wire.
The present invention now_provides_an_improved_fiber distributor which_overcomes the shortcomings_of the prior_art.
The present_invention