Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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Th~ pre~ent invention relate~ to an
in t~llation for producing corrugated oardboerd.
Tradition~lly, the produc~ion of corrugatad
cardboard con~ists in first corrugating thc interma-
05 diate peper by ins~rting ssid paper between tworollers having corrugated ~urfaces whose profiled-
section is identical to th~t required for the
corrugetad cardbonrd. The corrugated pep~r rem~ins
applied on one of the corrugatin~ rollers undar the
act]on of ~ ~acuum or of a positive pre~sure gene~at~d
by the air blown in~ide a clo~ed chamber which
surrounda the machanical parts from where tha
corru~ations st~rt in the paper ~o the are~ where th~
~econd pap~r i8 adhesiv~ly joined to the cresta of the
corr~gations.
This process is applied in continuous
installation6 comprising devices for feedin~ strip~ of
papar, a corrug~ting ~rain, a storage of the one-layer
corrugate (a ~mooth paper bond~d to the cre~t6 on one
si~a of the corru~ted paper), one zone for drying the
cardboord and ano~her ~one ~or cutting, alitting and
stacking tha cardboard sheets.
Heretofore, all the known embodiments h~ve had
problemQ in common which c~n be summed up a6 followa : -
A. - Speed. The conventional instell~tion~ have
raached their maximvm speed which is of about 300
mflters per minute and which cannot easily be exc~ded,
essentially ~or two reasons :
- Thc first layer of smooth paper is bonded
oY~r the corrugated pepor inside the corrugating trsin,
by compreu~ion betwo~n a amqoth face cylinder and the
corrU~ating roller on whi~h i~ applied the corrug~ted
p0per, this ~ausing the smooth roller, on reaching
certnin sp~fld, to Ju~p against th~ cùrrugating roller
~nd to oreat~ stron~ vlbration~, which reduce~ qu~lity
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standard6 after a certain Ypead.
- The joininy of the paper sheet~ d~ubles the
thiokne~s of the pap~r in the joining area thus
ceu~ing B jump when the glued part iQ ~ngaged between
05 the two roll~rs. A~ high ~peeds, this csuses the
rollors to jump thus cr~sting a zone of ~a~se
corrug~tions and a del~mination of the csrdboerd and
resultih~ in interruptions and delays in the remHind~r
of the op~ration.
~. - Th~ storage of th~ first two sized
pnpar~ rcæults in a cooling of the papers, which p~pers
must be reheated in thc bonding phase of the next
papers.
C. - After bonding of the third p~per, in tha
1~ c~se of a one-layer cardboard with only one
corrugation, or a -two-lsyer cardb~ard in which all the
papers are already bonded, the next step i5 tha drying
table comprising heating pl~te~ and a moving flpron
which drives the already shaped cardbourd over the
plates thu6 c~u~ing o friction of tha paper in contsct
with the plats~ snd consequently raising problems with
regard to the face of the paper if it i~ ~ preprinted
paper.
This drying method do~s not make it possihle to
~btain ~ uniform drying or humidity over the var~ou.Q
: lsyers o~ paper, sincs the heflt of the plate~ is
: ~on~eyed to tha upper layers of the cardboard by
p~saing through t,he lower pap~r and since owing to the
b~d ~onductivity of the paper, great differences of
tempar~tureæ are obæerved Dn the d~fferent layèrs.
On the other han~, when the heat is transmitted
upwards, the ect~al hu~idity of the paper runs out
togethqr with the wst~r contained in the adhesive when
the latter is drying under the eff~ct of the contact of
35 the peper with the heating plctss, such thet the
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eardboard comss out with an excessive humidity contant
in the top l~yers and a low hu~idity content in the
lower layers, so thst it t~kes ~eY~ral hours befhre the
stacked card~oard 8heets can be manipuleted in th~
05 follDwing processes, aince the humidity of the
cardboard ha~ to be stabilized evenly through~ut the
sheet. This proolem is an obstucle to the imple~enta-
~ion of an in~egr~ted method far producin~ the
cardboard box or packaging.
These problem6 are solv~d hith the procsss
according t~ the invention by applying the solutions
indica~ed hsr~in~fter.
~ he strips of paper are fed from reel holders
and automctically aa~embled "end-to-endn.
lS This means that the two strips of paper are
joined "end-to-end" by means of a very thin paper, such
that, if tha two strips to be sasembled have a
thickness of 0.3 mm and if they ars asscmhled in
3uperpo~ition, both strips have a total thickne~ of
0.6 mm. On the contrary, if the t~o strips ar~
essembled "~nd-to-end", and if -they ere join~d with a
0.1 mm thick ~dh~sive pAper, the total thickne~6 in the
joining area is 0.4 mm rather than 0.6 mm. This
difference makee it possible to ~ssemble the pflper st a
much higher speed~ On ~ha othe~ handl the "~nd-t~-ond"
a~emblin~ mcchines used in the prDcese sccording ~a
the invention resch 3peeds of almost 600 m/~in. while
ensurin~ a reliable asee~bly, thus eliminating the
storag~ which is required with the conventional
procs~se~
AnothRr characteristic of the invention liee
in the fact that the bonding of the first smooth lay~r
is qffectad wi~hout any presQure being applied bstween
the corrug~ing nnd the smooth roller. A cle~er
~olution i~ provided which onable~ the bonding of the
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first ~mouth l~yer of pQper over the corrugated core
without any pres3ur~ being exsrted betw~en the two
roll~rs, thus avoidin~ the sbove-mentioned vibration~,
~nd permi~ting an incr~ase of the process speed,
05 Unlike the convention~l corrugati~n method, the
fir~t smooth paper which is bonded over the corrugated
paper is m~int~ined on the corru~atin~ roller ~fter the
joinin~ point of the ~o paper~ until a secoad 6moo~h
roller is r~ached, ~/hich roller is al60 a he~ting
ro~lar, thus making i~ po~sible to keep the two pap~r~
in contact wi~h the heating roll~rs ~or a longer period
and ~paedinQ up the adhs~ive drying process,
The method u~ed for dryin~ the c~rdboard once
th~ second smooth layer has been po~itioned, is
dif~erent from the conventional method using fl~t
pl~te~ arranQ~d in alignment, and employs two large
heating rollers, which turn at a tangential apeed which
i~ 0qual to the ~peed of the cardboard, thereby
avoidin~ any friction between the ~oces of the paper,
~0 and ~urthermore, the two drying rollers are arrangcd in
such a way that the eardbo~rd can raceive heat on both
face3, by paasing from one roller to the other and by
slternating the contact between the ~wo faces. It
receives the ~me quantity of heat on both f~c~, and
comes ou~ complstely dry and wikh a uniformity of heat
and humidity which enables it to be treated in
continoue mann~r.
Th3 method according to the invention, in
avoiding the conventional gtorage and pa~sing di~ctly
rrom the corrugating train to the drying phase, permits
a grcat ~aving in thermsl ener~y while avoiding the
cooling of the fir~t two popers in the ~torage.
Alao, this solution prevent~ the printed
face~ from daterior~ting when preprinted p~per i8 u6ed.
In addition to 911 3aid improvement~,
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flnother bflaia characteristic of the prc&ent invention
lies in the w~y in ~hich the carrugated peper is held
in close contact with the corrugating roller~ fro~ the
corrugation point between the corrugating roller6 up to
05 its point of joining with the second paper.
Indesd, thie r~ult is achieved in the
conv0ntion~1 installations by a vacuum appli~d by the
roller, or by air blown in from a large tight chamber
ln~ide the corru0ation train.
Accordin~ t~ the invention, two hollow
section pisces ~re provid~d, one between the
corrugating rollers and the adhesive dosing roll~r, and
the o~her between the dD~ing roller and the meeting
point between th~ corru0ate~ papsr and ~he s~ooth
lS paper. Thes~ section pieces are provided with orifiaes
on the face adjacent to the oorrugating roller
conveying the corrugated paper. Pre~urized air is
injected at the ends of the section pieces and said
~ir comes out ~hrough the ori~ices by flxerting a
6uf~i~ient pressure on the paper in order to keep it in
contact with the corrugating roller.
These section pieces, by tending to keep the
pre6sura in orl~ spot, eliminats the nced for an
exp~nsive and complex pre6surized chambar on top of ~he
corru~ating roller.
The action of these blowing ~ection piecas is
meant to ba co~pleted by a particula~ embodiment o the
corresponding corrugetin~ roller, which may al~o
eliminate the ne0d fo~ said section pieces. According
to thi6 embodi~ent, the corrugating roller i8 composed
of a basic body on ~he surface of which a plurality of
groova~ are dafinedl said ba~ic body being cnclosed in
a casing de~ining, with the groove6, st~am pipes and
vacuum pipe-~, the latter communicatiny with the
outside, such that the inl~t of ~team and the outlet of
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cond~ ation water occ~r at one end of the roll~r whil~
~he vacuum is transmi~ted ~ the othe~ end; oll thi~
being auch that a uniform hestin~ of the whole surface
of th~ ~oll~r is obt~ined as well as a v~cuum which
05 retain3 the paper at multipl~ points of the surface of
the corrugating rollar.
Othcr basic charccteris~ic~ include the fact
that, it ia possible with the ne* prooess, to prùvide
two rotary pres~es at the ~nd of the path which press~s
enable the boxe~ to be produced con~inuously, and can
rsplac~ each o.ther .~o allow changes in the format
without having to ~top thc production line, as well as
other details which will be more apparen~ on reading
the followin~ de~cription and which, finally, make it
possibla to obtain an installation with one high-speed
channel, for producin~ a oDrrugsted cardboard in better
condition3 than -those offered by th~ conventional
installations.
The large cylinders for drying the cardboard
are arrangad ~o a~ to couple a aystem for continuously
introducing printed sheet~, this possibility giving
: the proceas the great ~dvantage of allowing the
~mall-scale m~nufsctur~ of high quality boxea, at costa
much lowar than those required ~or small-acale printing
with rotary printing machines.
: .Other chsrac*~ristic~ and advantage~ of th~
inYention will beco~e more apparent on reading ~he
following description of on~ exemple of embodiment
giv~n with reference to the accompanying drawings in
which :
Figur0 1 ic a dis~rammetic illustration o~ a
conventional in~tallation for continuously producing
corrugated cardboard;
Figure 2 is a diagr~mmatic illuatration, on a
larger scele, of on~ detail of the corru~stion unit of
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th~ a~oree~id c~nventional in~tsll~tion
Figure 3 is An overall dia~rammatic
per~pactiva of an installotion accordin~ to tha object
of the inYentiOn, and according to a non-re~trictive
05 nxample of a practical embodiment.
Figura 4 i9 an alavationsl ~iew of ~iguro 3;
Fi~ure 5 illu~t~at~s on a larser sc~le ono
part of the preceding ~igure;
Figur~ g illustrates on a l~rg~r ~c~le one
~etail of the corrugation unit of the inatallation
sccording to the ïnv~ntion;
Figur~ 7 illu~trate3 on a largar ~cale one
detail corresponding to the part of the in~talIation to
which thfl second ~mooth lay~r 5 i~ ~ixed by mean~ of
tha printed papar feeder or by means of a printe~ reel.
Rollers 12 and 13 rep~esent~d on this figure ar~ u~ed
~or dryin~ the cardboard on its two facas and far
01iminating strea~es in~id~ the cardboard in orde~ to
prevent th~ cardboard from warping;
fig4res 8 and 9 illustrate diagramma~ically
the corr~upation unit 1, according to ~everal practical
ariants of aaid unit, ~ith two sat6 of corrugating
rollers h~ing incorporatsd in said unit and ~eing
capabal of replacin~ each other by simple displacement;
Z5 ~ Fi~ure 10 6hows a cross-section o~ a
corru~ating rollor 7 acco~ding to a practica~ ~nd
possible variant embodiment o~ thi~ roller;
Figur~ 11 is a longi-tudinal section of the
corru~ating roller 7 of Figure 10,
;30 Fi~ur~ 1 and 2 show by way of example a
Dnyentional installation for producin~ corr~ga~ed
cardboard. This in6tallation use~ reel holders B fittad
with conventional non~-end-*o-cnd" asse~bling apparatus;
~uch th~t where ~he ~trips of paper 2, 3 ~nd 5 are
join~d up, th~ir thickne~s i~ ~oubled and that when
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they pa~s through ~ co~rugating machine l, shaking~ and
vibration occur.
~ n khs other hand, as shown in Figura ~ in
conYentional corrugating machinee l, the in~ermadiflte
strip 2 pasae~ between the two toothed roller~ 7 which
produce itQ corrugation and, once corrugsted, s~id
strip on the crests of thfl corrugations of one of its
f~ces, the corraspondin~ ~dhesive from the bonding
~aehina 8 in order to ensure bonding of the fir
0 smooth layer of paper 3 7 the two layers 2 snd 3 passing
between ons of the toothed roll0rs 7 and a smocth
roller lO
To achieve bonding of the two layers Z and 3,
the roller~ 7 and 10 are in pre~surized contact
~ogether and 8S a re~ult, due to the toothed form of
ths roller 7, shakings and vibrations occur aftsr a
certain spee~ is raached.
In thi~ conventional install~tion, the next
step to the corru~ting machins l is a storag~ ll which
2~ i8 nocas~ary to solve any problems which can ari~e with
the joints b0tween the ~trips of pRper inside the reel
holders ~.
After ~his storage ll, ths next ~tep i8 a zons
in which th~ corrugated inter0ediats l~yer Z receives
an fldh~sive on its ree fcc~ ~uch that the 3econd
~ooth layer of paper S can adhere thereon when
pa~sin~ onto a flat drying table 21 where finsl bonding
~nd drying ~ak~ place.
rO ensure the drying along the table 21, a felt
: 30 tape is circulated which tape driveY the csrdboard ovær
ixed lowar plate~ which aFe steam-heatHd. This
solukion implies that the cardooard be he~ted only on
one of its facea thu~ re~ulting in ~n ~nadequa~a drying
and a los~ of energy sin~e the cardboard ia a ~ery bad
condu~or af h~at.
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MoreoYer, fri~tion of the c~rdboord on the
fixad lower pl~te~ ent~ d~formation~ thereof,
including dafect~ in any printed part6 which the
oaI~dboDrd may comprise on it~ lower smooth f~ce.
05 According to the invention, ~nd as shown in
Fi~ure~ 3 and 4, the instsll~tion ~ccording to the
invention compriseR for feediny the 6heets af pap~r 2,
3 ~nd ~, respeetive f~eclin~ racl h~lders 6, whi~h, in
this ce~, sre espsci~lly fitted with automatic
~0 "~nd-to-end" ~ssembling machine8 for consecutively
assemblin~ the r~spective reels, ~uch that, in this
way, the exce6s thickne~ of the afore6aid Qhset~ of
pap~r i5 small, ~nd that it does not correspond to
twic~ the initial thickness as observed with the
overlappin~ joint~ which are made with the conventional
reel holders 6 of the conventional installation~. In
this way, it is possible with the "end-to-end"
aQsemblin~ machines to obt~in, for example if paper
~rip~ of thr~e tenths o~ thickness ore used, a
joining thickn~ ~ limited to D mere four tsnthfi,
against the ~ix tenths obtained with the convPntional
solution~. Thi6 smQller thickness prevent~ the
Yibration in tha corrugating machine.1 and increase~
tha ~pe~d. Morsovsr, tha reliability of "end-to-end"
Z5 asssmbling machin~ mskes it poQYible to eliminste the
storaye 11.
Furth~rmore, the corrugating machine 1 of the
installation ~ccording to the invention CompriQes a ~et
o~ two toothed rollers 7 which are one into the other
and betwoen which the paper ~trip Z t~ be corrvg~ted
p~SQ~, the latter thus ecquir~6 the corrugstion6 which
oor~esponds to the teoth of roll~rs 7 while, by me~ns
o~ th~ bonding mechin~ 8, i-t is impr~gnated with
adhegivo on the orests of tho corrugstion~ o~ one e~
35 ik~ faces, ~o that the fir~t smooth l~yer 3 Gon be
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bonded over this ~trip, a~ shown in Figure 6.
In tha installation ~ccording to the invention,
~aid onit 1 consi3ts of an ~rr~ngement of elements
which is ~uch that both lny~rs 2 and 3 remain on the
05 output roller 7, althou~h at ~ certain di~t~nc~
downstream of the assembly, remainin~ thereaf~er in
resting contact around a contiQuou~ hflatin8 drum g
whioh it'enoircles nearly ~omplPt~ly.
Wh~n ~omparing Figures 2 and ~, it i8 found
that, in Figure 2 which ~hows the conventional
installation, the l~yers 2 and 3 laave the contacting
rollers 7 and 10 virtually st th~ maeting point
th0r~f. On the contrary, in ~he solu~ion according to
the invsntion, illustra~od in Figure fi, on~e the layer~
2 and 3 have come to~ather and ore bond~d, they
continue on their path over a large curve o~ th~
corresponding toothed ~oller 7 then, -they encircle
most of the h~ating roller 9, thus ~n~uring e p~rfect
aQ3embly between layers Z and 3 and drying o~ the
adhesive, Between the smooth roller 10, which iC the
mamber eadin~ and preheRtin~ the paper, and the
corrug~ting roller 7, a ~light predetermined gap exists
which prevents any contact between the3e two roller~,
thus preventing th~ ahocks which c9U8a vibrations.
RoIler 9 turn~ a~ a tangential speed which i9
slightly greater th~n the speed of pape.r 3 and that of
roller 10, in ordcr te cause a pras~uriza~ion ar a
tansion on the paper 3 in the zone of ~ont~ct with the
toothad rollar 7, thus enhancing the bondin~ quality
3~ thanke to the pre-Q3ure applying th~ paper 3 on ~he
cre~t6 of the corrugation~ snd on the adhasive of th~
p~per 2.`
Furthermora, owing to the fact that the contact
between the joined l~yers 2 and 3 extenda over long way
3b th~ro i~ nu need for rolle~ 10 to be prnssed ~gainst
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th~ corre~pondin~ too~h~ roller 7, in order to en~bls
cont~ct betwean the two layers of paper Z ~nd 3, a~
this is th~ ca~e with the conventional corrug3ting
ma~hine~ 1 (6ee Figure 2) where such pres~in~ contact
05 is n~c~ssary,
In thi~ way, the rep~ted knocking of e~id
r~ller 10 and 7 is avoide~ owin~ to the tootheo
oon~iguration of the latt~r, thus elimin~ing thc
resultin~ vibrations.
In eddition, ~ince e~id roll~ra 10 and 7 ~re
not pressin~ a~ainst oach o~her, the layers 2 and 3
p~Ys b~tween 9~id rollers with complete freedom and
suficient room ~o that the excess thickness of the
joints do~s not cau8c sudden jump~ whsn passing
~hrough ~nd ~hus create d~fects in th~ ss~embly o~ aaid
layers 2 and 3; thi6, added to a reduction of the
excess thickness which i~ obtained with the
"end-to end" joining produced in the re~l ho~ders 7
~hich are used in this caae, ~nable the installation
according to the invention tn readily with6tand a high
feeding apeed o~ the etrips 2 and 3, which, in fact,
constitut~s the parsme~er which detarmines tho
production capacity.
On thc o~h~r hand, the cfect of the heating of
th~ as~embly 4 compofied of layers 2 and 3, which is
carried out by the drum 9 along thè path cvver~d by
3aid aseembly before coming out of the corrug~ting
machine 1, is that the layers 2 and 3 are ~lr~sdy
. ~ssembled e~ th~ ou~le~ from ~aid unit with a de~ree of
dryiny which mekes it ready to be used in the next
phas~; ~hiQ 01iminatin~ the othsr drawback of th~
convention~l in~tallationR in which the stornge 11 is
n~ceRs~ry to en~ure ths drying of ~aid ~sssmbly 4 of
strip~ 2 and 3.
The unit u~d for faatening thc ~econd smo~th
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layer of p~per 5 con~ists a~ ehown in Figure 7, in ths
case of the in~taIlfltion according to thfl invention, in
a Ret of two l~rge rollars 12 and 13 on the fir~ one
of which th6 Join~d a~sembly compo~ed of ~aid lay~rs 2
05 and 3 pen~trates by reating on ths smooth layer 3 snd
by encircling nearly comp~etely said roller, such that,
on this path, the second sm~oth layer of paper 5
pos~ion~ ~tself Dn ~aid ~sembly oy adherlng t~ the
cr~st~ o~ th~ free corru~ation~ of the corr~gated l~yer
Z ~hich hav~ been lmpregnated beforeh~nd with adhesiva
by means of a bondin~ machina 14.
The b~sembly formed o~ the three layers 2~ 3
and 5 pa~e3 ~rom this roller lZ to the othflr roller
13, on ~hich it r~ts via the atrip 5, i.e. unlike the
prior art techniquo, snd on which roller 13 ~aid
assambly in turn re~ts nearly all around said roller,
there~fter coming out thereof by resting en a conveyor
belt 15 provided with a vacuum fiuction which
facilitstee the ~ixing and actuati~n, to lead eaid
a~sembly consti~uting th~ cardboard up to the outlet
where, by means of ~haars lB and ~litting machine~
the ~ormed cardboard is slit and cut 80 as to be
eollact~d in a ~inal container 20,
The two big rollers 12 and 13 turn at a
tangential sp~ed equal to the linear spe~d of the
cardboard thus avoiding tha ~riction on the faces of ~he
cardboard.
The rollers 12 and 13 are ul~o heating rollers,
: ~ùch that the a~sembly constituting the cardboard is
subjected ~o an ~fficien~ drying process while
follow~ng the path where the second layer 5 is ~ixed,
coming out toward~ th~ conveyor belt 15 withcut h~ving
~o maintain a confin~ment above said c~nveyor belt and,
such that ~hi6 assembly constituting the cardboard
cover~ it6 Path with~u~ slipping on the bearin~
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elements, thus preventing th~ slJrf~c~s of th~ outer
faces wh~re ornomen~sl or inorma~ive printings msy be
~ppl~ed from b~ing scrstch~d; there b~ing, on the
o-ther hand, n~ riæk of the corrugated intermediate
05 layer 2 being dHformed since there is no anta~oni6tic
frictions betwe~n the bearing elEments ~nd the pres~ure
elements.
In an~ther aspect, thi~ ~rr~n~emen~ es well a~
the heating prodvcfld ~y the b~sring rollers 12 and 13
res~lt in the drying of the ~ssembly constituting tha
i~ore3~id cnrdboard, ia efficient and uniform throughout
tha thickness since, thank~ to the fact that it reat6
first of all on the roller 12 via the face 3 end then,
on the roller 13 via tha other face 5, heating ocours
lS ~hrough the two face~, such thet it i9 truly effici~nt
and uniform throughout th~ as6embly.
With this arran~ement of the installation
accordin~ to the in~ention, it is further possible to
incorporate the ~econd smooth layer 51 ~tarting with
continuoua ~trip fed from a corresponding re~l holder ~
as well aY with succe6sive single ~hee-t~, suppli~d by a
feeder 18, as ~hown in Figures 3, ~, 5 and 7.
Another sssential characteri~tio of the
invention i~ illustrat~d in Figure 6 7 in which
reEerence 19 d~ignat~s se~ti~n piece~ which may be
produced in alumin~um or any other ~imilar ma~erial,
~ch that pr~ssurized air may be bro~ht in, and co~e
out through oorrespondinQ orifices, provided on th~
face~ in facin~ reletionahip with the toothed roller 7
contia~o~ to the smoo~h roller 10.
In this way, the section piece6 19 take
advantuge of the free ~pace~ defined betwe~n the
roller~ 7, 8 and 10 in ord~r to take up a privilsdQed
position in which, ~cting a~ intake op~nings, they blow
pr~ssurized ~ir onto the corresponding rollsr 7 80 as
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to maintain th~ already corrug~ted layer of p~per 2 in
c108~ oont~ct with said roller 7, without thi~
requiring any other f~Qtoning me~n~.
Th~a~ blowin~ section pieces 19 can ~ither be
05 locat~d in other ~trategic points than those
represented in Figure 6, or s~ction piece6 with a
dif~eront con~i~uration can be adopted without
departing from the ~copo of the invention, which lia6
in th~ fact that the fastening of the corrugatod l~yer
1~ 2 on th~ correspondin~ toothed roller 8 or th~
ffl6tenin~ of the as~embly of lsyer~ 2 and 3 is obt~ined
by applying pres~urizeJ ~ir in localized spots, usin~
blowing ~eation piece6 19 arranged in ~trategic point~.
The ~ction of section piece~ ~9 can be
complet~d or replaced by a par~icul~r 6mbodiment of
corrugating rollers 7 repre~ented in Figures 10 and 11.
Figur~ 10 ~hows that the roller 7 is compo3ed
of an inner body 22 on the surface of which sre d~fin~d
a 6eries of grooves 24 and ~5. The inner body 22 is
surrounded by ~ sheath 23 thus formin~ pipeC wi~h the
grooves ~4 and 25, of which pipes tho~e corre~pondiny
to the grooves 25 are usfld for circulating the ste~m
and tho~e corr~sponding to the groove~ 24 are used f~r
: the vacuum.
~roove~ 24 opon onta the outside through
ln~c~ion holas 26, such thqt each hols ~6 gives rise
to ~n induction p~int which makes it possible to
maintain the paper in closs contect with the roller 7.
On th~ other hand, when steom covers *h~ groove6
25~ e quiok ~nd unifo~m heotin~ t~kes pl~ce throughout
the surface o~ roller 7, thus uYoiding deformstions of
~hi~ roll~r, and the need to provide for immobili~ation
perinds ~t the beginnin~ o~ the opera~ion until ~he
rollor 7, i8 heatsd a~ well a~ o$her similar problems.
Figu~a 11 ~how~ how the rall~r 7 i~ produced
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for this ~olution, accordiny to a non-limiting example
of practical embGdimflnt.
Ona ~nd of the roll~r 7 is provided with inl~t
for the 6team 2~ ~hich communicates with a a~e~m
05 collector 29 ~rom which th~ grooves 2S start,
The condsnsed ~te~m returns through du~t 32 up
to outlet 34.
The vacuum i8 created through the opening 31
located ~t the oth~r end of the rDller 7 and a vucuum
collectur i8 al~o proYided wherefrom the groov~s 24
et~rt.
- In order to e6t,ab~ish ~he inlet and outlet of
the ~te~m through one of th~ ends of the corrug~tin~
roller 7, thero are provided a corresponding Qtandsrd
1S rotary joint 2~ and a special rotary joint 3~.
It should be noted that the depth of the
grDoves 25, aQ shown in Figure 1~, increase
progres~ively 80 as to obtain ~ greater contact surface
between the stsam and ths 6teel, in order to make the
tempersture~ ~qusl at both ends.
According to yet another charscteris~ic o~ the
. invention, illu~tratcd in Figure 3, two presses 17 are
: provided, which pr~Rse~ sre rot0ry pressss. In thi6
way, thsra being two 6uch pros~e6, ona of them csn be
in opera~ion while the cuttin3 me~n6 are automatically
ch~nged on th~ other said means bein~ conveyed from a
:magazine up to th~ir mounting looation, via a rolling
brid~, such that said cutting mean~ are ready ~or use
without h~vin~ to interrupt the operation. Furthermoro,
the very principl~ of rotary press~s makee them more
: ~d~ptable to ~he hi0h speeds eupported by the
in~tallation according ~o the invention.
The csrrugating machine 1 aGcording to the
invention mak~s it pussible, whilc ret~ining all of its
3:5 main charac~e~istics, to ~dvance the pusition o~ ite
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bo~ding m~chine 8 and to arrang~ the rollers 7, 9 and
~uch ~a to almpli~y ~he chonging of the corrugatin9
roller 7.
For ~xMmple Figure ~ showa a ~olution in
05 which the pair of toothed roller~ 7 ran be easily
extracted by one sida, meraly by slightly tipping the
bonding machina 8, ~uch that once extracted, the pair
can be cle~ned up, raplaced, etc...
Fiyura 9 shows ~nother practical variant of
embodiment in which a plurality Df pairs of toothed
rollar~ 7 ~re provided, aaid pairs bfling ~rr~nged
diagonally and in such a way that either ono of s~id
pairs c~n be positionad selectively in its working
poaition as fl function of the needs of each operation.
It should ba noted that, for simplification
purposes, the in~tall~tion ha~ been dcscribed and
illustrated in its mo~t simple ~ariant, ~.e. that which
i~ used ~or obtaining corruysted cardboard comprising a
~ingl~ central corrugetQd layer 2 and two smo~th layers
3 and 5 but thHt, lo~ically, the principles of the
inven~ion remain the sam~ for producing corrugated
cardboard comprising more than one eorrugated layer 2.
The inventi~n is not limited to tha
in3tsllat~0n daacribed hereinsbove by way of ex~mple
Z5 and non-res~rictivaly and various modification~ may be
brought theretD by the m~n skillad in tha srt without
depsrting from its scopa.
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