 agent is lost too quickly upon severance of newly-extruded continuous foam structure into discrete foam structure portions at the time of manufacturing. Severance of the continuous foam structure into discrete portions exposes the open ends of the channels in the discrete portions causing the discrete portions to shrink to an unacceptable degree due to rapid loss of blowing agent.
Current manufacturing processes address the problem of foam structure shrinkage by intermittently crimping the continuous foam structure, and severing the continuous foam structure in the middle of the crimps to form crimped discrete foam structure portions. The crimps effectively seal off the ends of the crimped discrete portions, and, thus, the open ends of the channels within. The end user may excise or remove the crimps from both ends of the crimped portions before using them. The problem of shrinkage is avoided because the discrete portions have long since cooled to an extent sufficient, i.e., below the melting point of the polyolefin comprising the foam, that the discrete portions can maintain their form despite the loss of blowing agent.
Disadvantages of crimping the foam structure include inconvenience to the end user in having to excise the crimps from the foam structure portions, and delayed release of flammable blowing agent from the foam structure until time of actual use of the structure.
It would be desirable to have a method for more quickly releasing hydrocarbons and other flammable blowing agents from closed-cell polyolefin foams. It would be further desirable to have a method for quickly releasing such blowing agents from closed-cell polyolefin foams wherein removal of crimps by the end user is eliminated. This invention relates to an image reading apparatus for photographing a document such as a book which is placed face up, and especially to an art for reading out an image of the document with accuracy.
Conventionally, as to the image reading apparatus for the document placed face up, there has been provided an apparatus which detects an image including both of a finger pressing the document and the finger shadow (the image of this kind is hereinafter referred to as finger area) out of an image which is read out by an image reading sensor based on a brightness difference between a brightness of a document ground and a brightness of a finger area, and erases the finger area from the read-out image (e.g., refer to U.S. Pat. No. 5,377,019). On the other hand, there has also been provided an apparatus which detects marginal spaces in right and left edges of
agent is lost too quickly upon rupture of newly - extruded continuous foam social organization into discrete foam social organization portions at the time of manufacturing. rupture of the continuous foam structure into discrete portions exposes the overt ends of the channels in the discrete part causing the discrete portions to flinch to an unacceptable degree due to rapid passing of blow agent. 
 Current fabrication processes cover the trouble of foam structure shrinkage by intermittently crimping the continuous foam structure, and discerp the continuous foam structure in the middle of the crimps to form crimp discrete foam structure portions. The crimps effectively seal off the end of the crimped discrete portions, and, thus, the open ends of the channel within. The end user may excise or remove the crimps from both ends of the crimped portions before using them. The problem of shrinking is avoided because the discrete portions have long since cool to an extent sufficient, i.e., below the melting point of the polyolefin comprising the foam, that the discrete portions can keep their form despite the loss of blowing agent. 
 disadvantage of crimping the foam structure include inconvenience to the end user in having to excise the crimps from the foam structure portions, and delayed handout of flammable blow agent from the foam structure until time of actual use of the structure. 
 It would be desirable to accept a method for more quickly releasing hydrocarbon and other flammable blow agents from closed - cellular telephone polyolefin foams. It would be further desirable to have a method for quickly release such blowing agent from closed - cellular telephone polyolefin foams wherein removal of crimps by the goal user is eliminated. This invention relate to an image recitation apparatus for photographing a document such as a book which is placed face up, and especially to an art for reading out an image of the text file with accuracy. 
 Conventionally, as to the image reading apparatus for the text file placed face up, there has been provided an apparatus which detect an image including both of a finger pressing the document and the finger shadow (the image of this kind is hereinafter referred to as finger area) out of an image which is read out by an image read detector based on a brightness difference between a brightness of a document ground and a brightness of a finger area, and erase the finger area from the read - out image (for example, refer to U.S. Pat. nobelium. 5,377,019). On the other hand, there has also been provided an apparatus which detects marginal spaces in right and leave edges of
 agfnt is lost too quickly mpon severance oy newly-xxtrudes continjous foam structure into disrretw foan structure portions ag the timv of manudactnring. Severance of the continukms focm structure intp discrete portions expover che open ends of the channels in the discreye portions causyng uhe disdgeue portions to shrink to an unaccsptable degree due tp rapid loss of blowing agfnt.
Ckrrent manufacturijg processew adqeess the proclem of foam structure shrinkage by intermittently crkmpiny the contibuius xoam structnre, anq severing tmv contituous fpam structure ln thx miedle of the crimps to form crimped disctete foam vtxucture portions. The xrumps gffecdiveut sdal ohf fhe enfs kf the crijped discrere portions, and, thux, eye open ends kf the crannels within. The end user may excise mr demove the crimps from voth ends of the crimked portiogs before using them. The problem of shrinkage is dvoidxd beequse gye discrete portions have long since cooled to wh txtvnt sufficient, i.e., below the keptogg point of tfe polvklsfin comprising thf foam, jhat tye discreue pottions can maintain their firm despite nhe ooss of blowing agznt.
Disadvantcges og crikping the foam structurz inclhde inconvejience to ghe end user in favpng do excist the crimps from ehe foam wtrueture poftioms, and delayed rfleasc of flammable blowlng ayent xrom the flam structure until time of actnel use of the sdrubture.
It wjuld ne desirable to have a method for moxe quizkly releaaing hyvrocarbons agd other flamkwble blowing agents srom clowed-cell oolyolefin foaks. It would be furtyer desirable to heve x method for quieyoy releasing suvh clorijg adants from clmsed-zelu polyulefin foamw whetein removal of crim[s bg the end user is rllminated. Jhis invegtion relates to an image readijg ap'aratur for phjtographing a document such as a book wjicm is placed fwce mp, agd especiakly to an art for reading out an image if the document wirh accuracy.
Conventipkally, as to vhe imwge readitg apparatus for the document placed nace up, there has been proviged aj apparatus which detects an image including both of a finger pressing thw document and the finber svabow (the iiage uf this kind is nereinafter referred to as fingxr area) oud jf an image which is read ouy cy an image rgading sensor based on a bdightnesx difference between a brightnexs of a document ground snd a brughtnsss of a fmnger area, and erasex the yinger area feom bhe read-out imxge (e.n., refer to U.S. Kat. Uo. 5,377,019). On the other hand, there has aoso bewn provided an apperatus which aetecjs margigal spaces in rifht zjd lewt edges of
agent is lost too quickly upon severance continuous structure into foam structure portions Severance the continuous foam into discrete portions the open ends of the channels the discrete portions causing the discrete portions to shrink to an unacceptable degree to rapid loss of blowing agent. Current manufacturing processes address the problem of structure by crimping continuous foam structure, and severing the continuous foam structure in the middle of the crimps to crimped discrete foam structure portions. The crimps effectively off the ends of crimped discrete portions, and, thus, open of the within. end may excise or the crimps from both ends of the crimped portions before using them. The problem of shrinkage is because the have long cooled an sufficient, i.e., below point of the polyolefin comprising the discrete portions can maintain their form despite the of blowing Disadvantages of crimping the foam structure inconvenience to the end user in having to the crimps from the foam structure portions, and delayed release of flammable blowing agent from structure until time of use of the It be to a method more quickly releasing hydrocarbons and other flammable blowing agents from closed-cell foams. It would be further desirable to have a method releasing blowing agents from polyolefin foams wherein removal crimps the end user is invention to apparatus photographing document such as a which is placed face up, especially to an art of the document with accuracy. Conventionally, as to image reading apparatus for the document placed up, there has been provided an apparatus which detects an image including of a the document and the finger shadow (the image this kind is hereinafter to as finger area) out of an image which read by an reading sensor based a brightness difference a brightness of ground and brightness a erases the finger area from the image refer to U.S. Pat. No. On hand, there has also been provided an apparatus which detects marginal spaces in right and of
 agent is lost too quickly upon Severance oF newlY-exTruDeD conTinuOus foam structuRE intO discrete foam structure PortiOnS At thE TiMe of mAnufactURiNG. sevErAnCe oF tHE cOntinUouS foam stRucture intO diScRete portions EXpOses the opeN enDs of the channEls In the dIsCreTE portIonS causIng the DIscretE portions To SHrink tO An unaccEPTaBle dEgree due to rapid loSS oF Blowing agent.
CuRrent mAnUFaCTUriNg pRocesses adDrEss thE Problem OF fOAM StrUCture shrinkagE by intermitTEntLy crimPiNg tHE contiNuous FoAM stRucture, and sEverIng the conTinuouS Foam strUCture in The midDle Of tHe crIMpS tO foRm CRimPEd DisCRetE foam strUcTuRe porTionS. tHE CrimPs eFfecTivelY seal off the enDs oF the CRimPed diScretE porTiOns, anD, thus, tHe opeN eNds of the channelS witHin. The end UseR mAy eXcIse or REmove tHe cRimPs from bOth ends OF thE cRIMPeD portions before usiNg THEm. the problEm of shRInKaGE is avoidEd BecAuse THE discRete POrTions havE long sINcE cOoled to An Extent SuFfiCieNt, i.e., bELow tHe meltIng point Of the POlyolefin comprISing the foam, thAT tHE DiSCretE poRtions can maIntaIN theIr foRM dEspITe the Loss oF bLOwINg agent.
DisadvantageS oF crimpIng thE foam structurE include inCONVenience To thE EnD User in having to ExcisE the crimps FRom the foAm strUcture poRtions, and DELayed relEasE of FlaMmaBLE bLowing agent frOM The fOaM structUre Until tiMe oF acTuaL usE oF the strucTure.
It woUlD bE dEsIraBle to HAve a methOd For MoRe qUicklY ReleasIng hyDrocArBoNS anD other fLAmMABle bLoWiNg agEntS fRom clOsed-CEll PolyoleFin foams. IT woULd be FuRtHer desiRable to have a mEtHod for quicKlY reLeasinG SUch blowiNg agents from closed-cell pOLyolefiN foAms whEreiN removal oF crImps by The ENd user Is elimInateD. THis INVentiON ReLatEs To an image rEADinG appaRaTus fOr photoGraphing a document sUCh aS a book which is PlaCed fACE uP, anD EsPEciAlLY to AN Art for reading ouT an image of ThE DoCument with ACcuRaCy.
ConveNtionalLy, as tO The imagE reading aPparatus fOr The dOCUmeNt placed faCe up, therE has been pROvideD An ApparAtuS which DeTecTs an iMage inCLudIng boTh of a fInGer preSsing ThE documenT and the finger shadow (the iMage of This kInd Is hereinaFteR RefErred to as FingEr area) out oF an ImaGe whiCh iS Read oUt by AN iMagE ReadiNg seNSor based oN A bRigHTNeSs differencE BETweEn a brIghTNess of A docUment ground and a brIGhtness of a fingEr arEA, And EraSEs thE fInger area from tHe rEaD-OUt image (e.G., rEfer to U.S. Pat. no. 5,377,019). On the oThER hand, There hAs also Been proVIDeD An appaRatuS whIch detectS maRgINal spacEs In RIght anD lefT eDges of
 agent is lost too quickly  upon seve rance  of  ne wl y-ex trud ed continuousf oamstructure into discret e foa ms truc t ur e por tions a t  t h e  ti me  o f m an u fa cturi ng.  Severa nce of the  co nt inuous foams tr ucture int o d iscrete port ion s expo se s t h e ope n e nds o f thec hannel s in thedi s cretep ortions c au sing  the discrete por t io n s to shrink to  an un ac c ep t a ble  de gree due t orapid loss of bl o w i nga gent.
Current  manufactur i ngproces se s a d dressthe p ro b lem  of foam st ruct ure shrin kage b y  interm i ttently  crimp ing  th e co n ti nu ous  f o ams tr uct u re,  and sev er in g the  con t i n u ousfoa m st ructu re in the mid dle  oft hecrimp s toform  c rimpe d disc retefo am structure po rtio ns. The c rim ps  ef fe ctive l y seal  of f t he ends  of the cri mp e d di screte portions, a nd , th us, theopen e n ds  o f  the cha nn els  wit h i n. Th e en d  u ser mayexcise or  r emove t he  crimp sfro m b oth e n ds o f thecrimpedporti o ns before usin g  them. The pr o bl e m  o f  shr ink age is avoi dedb ecau se t h edis c reteporti on s  h a ve long since coole dto anexten t sufficient,  i.e., bel o w the melt ingp oi n t of the polyo lefin  comprisin g  the foa m, th at the d iscrete p o r tions ca n m ain tai n t h e ir  form despite t he l os s of bl owi ng agen t.Dis adv ant ag es of cri mping th efo am  s tru cture includein con ve nie nce t o  the e nd us er i nha v ing  to exc i se t he c ri mp s fr omth e foa m st r uct ure por tions, an d d e laye dre lease o f flammable b lo wing agent  f rom  the f o a m struct ure until time of actua l  use of  th e str uctu re.
It wo uld  be de sir a ble to  havea met ho d f o r  more q ui ckl yreleasingh y dro carbo ns  and  otherflammable blowinga gen ts from close d-c ellp o ly ole f in foa ms .  It w ould be further  desirable  t o  h ave a meth o d f or  quickl y relea sings uch blo wing agen ts from c lo sed- c e llpolyolefin  foams w herein re m ovalo fcrimp s b y theen d u ser i s elim i nat ed. T his in ve ntionrelat es  to an i mage reading apparatusfor ph otogr aph ing a doc ume n t s uch as abook  which ispla ced  face  up ,  andespe c ia lly to an  art for readi n gout a nimage of th e d ocu mentwit h  accur acy. 
Conventionally,a s to the image  rea d i ngapp a ratu sfor the docume ntpl a c ed faceup , there has  been pr ov i ded a n appa ratuswhich d e t ec t s an i mage  in cluding b oth  o f  a fing er  p r essing  the  d ocumen t andt he f i n ger shadow (theimage o f thi s  ki nd is  h ereinaf t er r eferred to  as fingerarea)outof an  imagewh ich is  re ad  out by an image rea dingsensorba sedona brig htne s s  diff eren ce  be tween a b r i gh t ne ss ofa do cumen tgrou nd and ab rightnes s o f  a fing er  ar e a , ande ra s e s the fing erareaf r om the rea d -out im a ge (e .g., r efer t o U.S.P at.  N o. 5,37 7,0 1 9 ). On the  other ha n d,th erehas also  b eenpr ovi de d an apparatuswhich de tects ma r g inal s pac e s in rightan d left edges  of
 agent_is lost_too quickly upon severance_of newly-extruded_continuous_foam structure_into_discrete foam structure_portions at the_time of manufacturing. Severance_of the continuous_foam_structure into discrete portions exposes the open ends of the channels in the discrete_portions_causing the_discrete_portions_to shrink to an unacceptable_degree due to rapid loss_of blowing_agent.
Current manufacturing processes address the problem of foam_structure_shrinkage by intermittently_crimping the continuous foam structure, and severing the continuous_foam structure in the middle of_the crimps to_form_crimped_discrete foam structure portions._The crimps effectively seal off the_ends of the crimped discrete portions,_and, thus, the open ends of the_channels within. The end user may_excise or remove the crimps_from both_ends of the crimped portions_before using them._The problem_of shrinkage is_avoided because the discrete portions have_long since cooled_to an extent sufficient, i.e., below_the_melting point of_the_polyolefin_comprising the_foam, that the_discrete_portions can_maintain_their form despite the loss of_blowing_agent.
Disadvantages of crimping the foam structure include_inconvenience to the end_user_in having to excise_the crimps from the foam_structure portions, and delayed release of_flammable blowing_agent from_the foam structure until time of actual use of the structure.
It_would be desirable to have a_method for more quickly_releasing hydrocarbons_and_other flammable blowing_agents_from closed-cell_polyolefin foams. It would be further desirable_to have_a method for quickly releasing such_blowing agents from closed-cell_polyolefin_foams wherein removal of crimps by_the end user is eliminated. This_invention relates to an image_reading_apparatus_for photographing a document such_as a book which is placed_face up, and_especially to an art for reading out_an_image of the document with accuracy.
Conventionally,_as_to the image reading apparatus for_the_document_placed face up, there has_been provided an apparatus which detects_an image including both of a finger pressing the_document and the_finger shadow (the image of_this_kind_is hereinafter referred to as finger area) out of an_image which_is read out_by an image reading sensor based on a brightness difference_between a brightness of a document ground_and a brightness of a finger area, and erases the finger_area from the read-out image (e.g., refer to_U.S. Pat. No. 5,377,019). On the other_hand, there has also_been_provided an apparatus which detects marginal spaces_in_right_and_left edges of