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Патент USA US2404582

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July 23, 1946.
‘Filed; Feb. 9, 1944
2 Sheets-Sheet l
cracker: n BOSOMWORTH
July‘23, 1946.
2,404,582 I 1
2 Sheéts-Sheet 2
Filed Feb. 9, 1944
1920/5“ 505430 5/5/52 {I8
‘ 5o :- 4|)- 5'/ 55\
50‘ I80.
__ .
~ [
2B :
Patented July 23, 1946
‘ "George P. Bosomworth, Akron, Ohio, Iassignor‘ to
The‘Firestone Tire & Rubber Company, Akron,
Ohio, a corporation of Ohio
Application February 9, 1944,'Serial No. 521,729 I
14‘ Claims. (CI. 18-15)
This invention relates to apparatus for making
sheet ‘material, and more especially it relates to
improved apparatus for the ‘manufacture of con
tinuous rubber sheeting in vsingle ply or in lam
blade. An important feature of the invention is
the construction andarrangement of 'saidlateral
guides which are required to‘prevent latex from
the bank or pool from seeping between the guides
and the conveyor, since such latex ‘would be co
agulated and agglomerated 'by relative movement
of the conveyor and guides and thereby pro
duce ragged margins on the layer ‘of material
canized masticated rubber is a relatively stiffv plas-'
spread upon theconveyor'by the doctor blade.
tic which readily may be- sjheeted‘to any thick 10
The-chief objects of the invention are ‘to pro
inated form.
Rubber sheeting may be "made from compound
ed masticated rubber-or from an aqueous‘ disper
sion of rubber, such as rubber latex. Unvul
ness on the usual calender.
vide improved sheet material composedof rubber
deposited directly from vlatex; and to provide im
For many purposes
vhowever, such as for hospitalsheeting, it is de
sirable to form the sheeting from rubber latex,
proved apparatus ‘for continuously producing
which rubber'has better aging qualities and other
sheet material of determinate thickness from rub
'ber latex. More speci?cally the ‘invention ‘aims
desirable characteristics. Because of its extreme
?uidity, considerable di?iculty is encountered in
vforming continuous sheeting from rubber latex
since conventional sheeting methods cannot be
to produce continuous latex sheeting of uniform‘ '
thickness and smooth lateral margins. vAnother
object is to provide in a novel manner \for ‘later
employed. Prior to the present invention one
ally con?ning a ?uent pool or ‘bank ‘of rubber
method of making rubber sheeting from latex 20 latex :upon a moving conveyor contiguous with
was to pass a‘continuous conveyor through a
a doctor blade operatively associated therewith.
tank of latex to deposit a thin ?lm of a, few thou
sandths of an inch thickness on the conveyor,
Other objects will be manifest as the descrip
tion proceeds.
Of the accompanying drawings:
dryingv the ?lm, and then repeating the opera
tion a great number of ‘times to obtain a deposit 25
Fig, 1 is a perspective view of one ‘end ‘portion
of desired thickness‘before removing the ?lm from
the. conveyor. The method not only required
considerable time, but the sheet material pro.
‘of apparatus embodying the invention, and the
work- therein:
duced was not #of uniform thickness.
portion of the vapparatus;
Fig. 3 isa fragmentary sideaelevation of ‘the ap
Fig. 2 is a perspective‘ view of the opposite end
In :another process, a thin ?lm of latex was 30
continuouslydeposited and dried upon the con
veyorin ‘the manner previously described, then
was progressively stripped from the conveyor and
doubled and pressed upon itself to produce a lam
inated sheet of the desired number of plies.
still another process the‘latex was applied ‘to an
paratus, and the work therein, on a larger scale,
showing the doctor blade ‘and structure adjacent
Fig. 4"is a section of the'apparatus, on a. larger
' scale, on the line 4-—4 of‘Ffig. 3; and
Fig. 5 is a section‘ on the '1ine'5—5..of ‘Fig. 4.
endless conveyor by spreading it thereon to about
Referringnow to Figs. 1 and 2 of “thedrawi'ngs,
.004 to .008 inch thickness, then dried on the
there is shown an elongate ‘endless-conveyor ['0
conveyor, and the operation repeated to build
upon a surface of ‘which one or more layers‘ of
40 ?uent viscous ‘composition ‘such as rubber ‘latex
up a laminated sheet of the ‘desired thickness.
In allof said methods the respective plies of
may be spreadcin :the manufacture of sheet mate
deposited material were of ?lm thickness with
rial. The conveyor 10 may be‘composed of sheet I
the result that ‘considerable time was required in
metal, suchas aluminum, or it may be composed
the construction of a'laminated sheet of ‘substan
45 of fabric, and its'surfa‘ce may 'betreated, as by .
tial' thickness.
waxing, to ‘facilitate removal of the material
The apparatus of ‘the present invention com
spread thereupon. For supporting said conveyor ,
prises a moving endless conveyor, a‘ doctor blade
an open framework II is provided, and supported
operatively associated .therewith,‘means for main
bysaid framework,'intermediate'the ends ‘thereof,
taining a bank or pool of ?uent rubber latex on 150 is vvan elongate housing or oven l2 through which
one‘side of said doctor blade, including lateral
guides ior‘laterally con?ning said bank'of latex,
the intermediate region of the upper‘ reach and
lowerreach of the conveyor pass the oven enclos
and an oven closely adjacent the opposite side
ing the major portion of the conveyor, "leaving
of saiddoctor .blade‘for gelling and drying the
but, minor portions of“ the conveyor exposed at
'wmposition Spread upon the conveyor by said 166 opposite ends ‘thereof. The conveyor is support
a doctor blade I1 that extends transversely of
the conveyor, above thesame, said blade being
,ed at its respective ends exteriorly of the oven
‘upon pulleys I3, I3, one of which is driven by
secured to a lateral face of a supporting beam
Is that also spans the conveyor. Means is pro
‘ any suitable means (not shown) for the purpose
of impelling or driving the conveyor in the direc
‘tion indicated by the arrows in the drawings.
The lower reach of the conveyor is supported
vided for adjusting the angular position of the
beam I8 and blade I‘! with relation to the con
veyor I 0, and also for adjusting-Fthem upwardly
or downwardly to'alter the proximity’ of the blade
‘ upon a plurality ‘of idler rollers or sheaves I4, I4
7 1 that are journaled in suitable brackets that are
to the conveyor and thereby to alter the thick
Two of the rollers 10, ness of the layer of latex spread upon said con
1 I4 support an endless canvas belt II4, the major , ‘, veyor. .To this end the beam ‘I8 has its opposite
portion of which is located in the lower portion 1“ ends formed with respective axially extending
I9 that are journaled for rotative
‘ 'trunnions
of the oven I2, the lower reach of the conveyor“)
movement in ‘respective slide-blocks 20, the lat
resting upon the said belt II4 so thatany ma
' ter being mounted for vertical movement in suit
terial deposited upon the said conveyor It] will
I mounted upon the framework II_ or which are
I mounted within the oven I2.
not be marred.
able slide-brackets 2I, Figs. 1 and 4, that are
mounted upon the framework I I at opposite sides
'Resp'ective adjusting screws 22 are
threaded. vertically through the slide-blocks, the
arrangement being such that the rotation of said
screws, in unison, willraise or lower the slide
blocks 20 and with them the beam I8_ and doctor
blade I1. For turning the adjusting screws 22
in unison, each of said screws has-the upper end
thereof provided with a bevel gear II8, the lat
The upper reach of the conveyor I
I0 and both reaches of the belt‘ I I4 are support
§ ed upon a series of smaller, more closely spaced,
I idler rollers I5, I5 located within the oven.
The .
‘ conveyor I0, at one endof the apparatus, is dis
posed in a reverse loop, and located in said loop
is an adjustable idler'rollerrldva, Fig. ,2, that is
~ utilized to maintain the conveyor in taut condi
1 tion. Preferably the roll Ma, is cloth covered so
1 asnot to marany sheet material on the conveyor
‘ I0, and so as not to adhere to material, deposited,
ter being meshed with respective bevel gears II9
that are mounted upon a shaft I20, Theshaft
thereon, which material may be tacky.‘ The fea
ture‘of feeding, the lower reach of the conveyor
I29 spans ‘the conveyor I0, and is journaled at
its opposite ends in bearing brackets l 2I mounted
atop ‘of the slide-brackets 2|‘. At one end the
‘ III back through the oven I2 conserves heat inthe
conveyor and expedites the heat treatment of the
1 for, progressively gelling, vulcanizing and for dry
shaft I20 is provided with a hand-crank I22 by
which it may be rotated. Mounted» uponone of
the slide blocks 20 is a gauge I23, ,Fig. ‘1, that’
engages the ?xed framework I I, the arrangement
being such that said gauge will indicate the ele'é
vation of the slide-block 20 and doctor blade I‘!
carried thereby, and thereby to indicate the thick
ness of the material spread upon the conveyor
‘ ring sheeted latex rubber composition that may .
by said doctor blade.
‘ rubber composition deposited thereon, Further
‘ more, less of the conveyor is exposed to the atmos
j phererand there is lessdust from the atmosphere
‘ collected thereonv and,,on;the material carried ‘
I thereby, with the result that improved cohesion
of superposed layers of material is achieved.
7; 'Within the oven I2 are suitable heating means
The beam I8 is a generally cylindrical structure
i be spread upon thesurface of the conveyor or 40
that is ?at on the side thereof that normally is
‘ which‘ may be fabricated thereon, the atmos
phere within the oven being humidi?ed toprevent
surface cracking of the composition. To eXpe
dite gellation of the rubber compositiomsuitable
disposed uppermost.
conveyor‘ and beneath a flat plate I6a which
desirable to rock the beam I8 on its trunnions
‘ supports the conveyor as it passes thereover. In
and secure it in such position with’ the blade I‘!
tilted to a position substantially above the con
veyor, as when cleaning said blade, and to this
end each ?ange I8a is formed with an arcuate
The lateral face to ‘which a
the doctor blade I? is attached is ?at, is disposed
in' a plane at right angles to the saidv ?at top
‘ steam-‘heated coils I6, _. mare, located withinthe 45 'surface, and terminates short of each end of
the beam to provide respective flanges I80, there
, oven immediately‘ adjacent the work-receiving
at, which flanges, abut thelrespective slide-blocks
3 opening therein, some of said coilsi being located
20, as is best shown in Fig. 4. It is sometimes
, above the conveyor and some located beneath the
some instances extremely rapid gellation is_ de
? fsire'd', ‘for example, when thick latex ?lms of
0.050 inch or greater thickness are spread upon
slot 25'that is concentric with the, axis of the
1 the conveyor, and for this purpose electrical heat
ing elements IIB,’Fig. 3, are positioned beneath
55 beam-trunnions - I9.
Threaded ‘ studs
'mountedin the respective slide-blocks 20 and
extend laterally therefrom through said slots 25,
‘the projecting ends of the studs being provided
I the conveyor I0, exteriorly ‘of the oven in front
. of the work-receiving opening therein, said ele
ments being’ disposed beneath a ?at plate IIBa
with the usual nuts, which, when tightened, re
elements. It is‘ desirable however that the ele 60 tain the beam I8 in the tilted position mentioned,
or in normal operative position shown.’
ments I IB’be 'su?iciently removed from the doctor
The doctor blade I1 is secured to the ?at lat
j blade of the’ apparatus so as not to exert a gell
eral face of’ the beam I8 by a longitudinal series
ing" effect ' upon the ‘latex composition there
ofset screws 28, 28that extend through respec
"against. Gellation also may be expedited by the
tive slots 29 in the blade, said slots being ver
' use‘ of heat-sensitized latex,
j which ‘support the conveyor as it passes over said 1
tically arranged to enable vertical adjustment of
the blade relatively of the beam. The beam com
jThe" work-receiving end’ of the ‘oven I2, ‘"as 1
prises arportion Illbthat overhangs the upper’
‘ ‘shown in‘th'e drawings, is at the left thereof and i
appears in Figs. ‘ 1 and '3. :‘Immediately anterior 170 margin of the bladeVIfI, and threaded through
said overhanging portion of the beam is a series
to's'aid receiving end ofthe' 0ven,in operative as
of set screws 30, 30 adapted to bear against the
sociation ‘with the conveyor I0, is located means ‘
uppermargin of thevblade, in regions thereof in
termediate the, set screws_28.’g By, means of the
, ‘for applying successive layers or plies of rubber
latex‘, of accurately. controlled'thickness, to the
vF01) face 0? scidlqveieypr- .$aid,mea?SP°mPIiSe-i
setesqrews 28, and 30 _it,_is,
surev against selective» regions» of: the blade and.
thus tol?e-xfandf deformitini-ts ownuplanes The
arrangement makes/‘it 1- possible to-compensate: for
sage innv the ‘blade ‘and; irregularity, in» the) bottom:
margin- thereof»; or- irregularity: of- the; surface of;
of the conveyor; Mountediuponeach stud“? i'sa:
latter constituteseal partialhsupport {on a;- pai'r of
lateral guidemembers, each designated-as a=who1e
by the numeral 52.
shorts angular-1y adjustablelarm 50;: the free ‘ends
or said»armssupportingatransverserod 514., The
Providing a solid support for the conveyor Ill‘;
immediately below thedoctor blade: I?! ,1 is :a roller
3Z1v over-‘which said“ conveyor passes; said" roller
isL provided- with a: hook-like - formatir'm-v 55i that
beingjournaledlupona shaft-33 that issupported
engages -with'the= rod L 5 I? to abe- supported thereby;
AslisLbest¢shown ini‘i'gs‘ 340-5}v eaclr lateral
guidemember- 521£comprises=a main-plate 54 that
Adjustably secured; toit‘he mainl plate 54 by-L bolts
56;; 56 is» a secondaryor guide plateEJihav-ing-its
In’ its; approach-1 to the roller.- 32. the ‘conveyor
moves up~an= inclinedi plane! from at supporting
lower» margin» disposed‘: in determinate proximity‘
roller- 34'» at"thebottomeoff-said inclinedi-region;
to~the ‘conveyor, l0; as-presently willbeexplaihed}
The“ roller 3k is,-v adj ustable to ~vary~the~inclination 15 and having oneend thereof abutting thesd'oct'ori
blade |>'|‘.‘- Pivotallyuattach'ed at? 58 toztheother
ofl'theconveyor"'self-i and the roller; 32.,
and-‘ to this end- saidi~ roller: 34¢ isajournaledi on a,
end portioniofftheguidelplate 51 islaniexrtension'w
shaft 3511supporte¢ at its~-respective> ends~byi a
or1arm~ 59 ‘that; extends: beyond:v the end of I said‘?
plates?’ and- has air-‘supporting roller 6mjournaled
pair of arms; suehias-f-the arm=~36g the lattenb‘eing
disposed- on the outer sides¢of~> the frame; [IL and? 20s at‘ its'outen orfree end;- said‘roller-extendingjlatera
pivotally mounted on'ltheprojeeting endipior-tions
all)L of~ the.arm.. Atitsl inner: end adjacent-its
pivot point158; the ‘arm; 59§is¢engaged by abpainof;
ottheshaft 33'. Adjustingmechanism designated
as'a ‘whole bythenumera]; 31> iscprovidedfforwman
adjusting; screws; 61; that arethreadeclI through!
ual-operation to adjust the-angular‘ position" of~
anoverhangingbracket 62 carried: by the guide
adjacent, its-opposite ends- by the =~frameworkzv |:~| .- ~
; plate: 5.1;. The arrangement iesuchthatb-ymeans
the arms 36 on their pivot, and consequently; the
elevationo? thelrollerl 3L4’; Between the rollers
ofitheiscrews'lii ll the‘ angular;v relation \ofs'theguid‘ea
plate: 51; and.“ its extension; 59tmay= be varied?“ As:
shown‘. in_the= drawings}, the.roll‘ersa 60;‘ arerona the"
confronting‘ sides of the extension) arms; 5‘9;.so;
32;‘ 34; theconveyor l-?l- is solidly supportedi'upon‘
a-flat plate 389that= is carried~by~ the a-rms?t ; the:
arrangement: being such; that‘: the inclinedv region
of the ‘conveyor-Kris supportedl at all‘; angles :of;'in~
. that they will ride upon theqlayer oft'oompositionx
4| h if‘ the :latter.‘ remains on .the conveyor-‘whiletthe
- It is‘ on-theinclinedzregion of? the conveyor" l8:
conveyor makes: moresthan: onetraversezpastzthe
that there-‘is2 maintained a .bankbr-poolzof vi's.~
cous rubber" latexv composition. 4a: from which
sheeting; V Howeveryifz the layer, spreads‘. onithe;
pool‘ composition is spread'- upon: the‘ conveyor;
: conveyor" is: to beremovedgtherefromnas soornas
doctor; blade: IL. as-in the making o?multiplyi
it\passes;from.the:oven; I12, the'lguidet'membersi?‘;
by the doctor-‘blades H" as; the: conveyor‘ passes
may; be‘ transposed, if‘ desired; since; them the
rollers; 60 rideupon; the bare;con.veyor:
. terial 4|. The latex: composition-isdis-charged‘
important: feature of the qinventioinc made‘
onto 'the conveyor I0, from-anozzle 4'2, at-asregion
that‘ i's-'- disposed» somewhat anterior to‘ the doctor 40. possible by, the adjustable, mounting Ofathe; late
blade H so that the pool or compositionhas sub.
era-lguides : 52 , ‘ isthe {position of..thezbottomama1:-;
gin; of: each guide‘ plate 5.1 with relatiom to the;
stant-ial; area» and is enabled- to‘ spread‘ so . as; to:
be -of-' substantially uniform thickness at. the doc
surface of“ the; conveyor In, _or the: surfacesoiz‘the;
sheet‘ materiali; 4| when laminated.‘ sheeting; is;
tor-‘blade; whereby‘ uniformity ‘of! thickness of the
beingproduced; As.- is bestvshown in;Fig,-z5,l the.
1ayer~47|~1isl achieved. The feature of maintain-q
bottom~,marg_ins::0f :the guide; plates 51 are_;spaced=.
ing-the ~pooliiof' composition upon the inclined re;
from “the-surface .ofrth‘e; conveyontand; suclrspace
gion of the conveyor prevents the accumulation
ingc varies; from" a. very slight clearance;v atsthe;
o?'axthick mass of composition against the doctor
endszof the-plates nearest; the doctor bladegto~ as
blade, andthethickness of the layer'4‘|-' that: 1S1’
spread is, not affectedlby hydrostatic, pressure (of
somewhat greater- clearancexat . the: opposite < ends.
the pool of composition. Uniformity otdistribur
of; the :plates-,_ the clearanceshowever,“being; subtion ofv the viscous ‘composition: is effected: by;
stantially-less than t the; thickness, of the-sheet» 4| ;
mechanism.’ that isrdesignate'd; as a-\Whole by ‘the.
immediately; posterior; to; the doctor. blade.;,
example, the doctor blade may be positio'ned,.040!*’
numeral 43, Fig. 1. Said mechanism SUDDOI‘tSathE
nozzle 42 and feedsit. laterally‘ back and, forth 55 fromvv the conveyor, the. adjacent 'ends; of the '
across the conveyor to distribute the latex evenly
guide-platespositioned ‘.002!’ from the conveyor,,
overcthellatter." .The., conneoted‘by- a
and"; theqoppositeends offtheguideeplates posi-l
tioned: .010.” from thervconveyor. Experiencehas,
flexible» conduit: 44'.to vensource of. supply" 45,lthe,
thereunder; to'lproduce the ' layerror'sheet of. ma:
latterdnchlding. means". (not. shown) for supply‘
inglaaconstant».volume“ofrlatexto.the.nozzle;v The;
shown " that: when; the lateral guide: plates, are.
60 spaced'fromithe conveyor to the extentset forth-,j,
elements; designated-1A3.- and, 45 are. not, a; parti of.
the .‘present; invention, .wherefore a: fuller diSGlOe»
snre; thereof ‘is; not believed.- to be; necessary.‘
The-maintenanceof the pool: of composition 43: 65
the; ?uent latex- compositionofv-ctheapool 40-there~‘
of doesmotseep between thebottomt-of» the-blades
and the. conveyor, ,whicha phenomenontissbelieveds
providedzatteachlside so as laterally to con?ne:
the:;nool:.and_thus "to: determine thewidth of- the:
latex-resulting ‘from the pinching thereotbetween;
the guide »=Dlates~ andwconveyor; and the margins;
layer 4| spread; upon the conveyor. To thisend;
the<blade..-supporting: beam‘ |8~ is provided;_ be
tween’ itsend ?anges; |8a and‘on the-‘flat lateral.
_. Thisis so also. in? thosewcasesawhere therconveyor.
’ makes; several traverses, through the; apparatus,-:;
on: the conveyor‘ requires - that‘ lateral guides be;
facethereof, withprojectingl ears - 48, 48: adjacent‘
' the “respective ends of:. the beam,‘ eachoff said:
earss supporting; a laterally; projecting stud‘; 49';
to be :the result OfithB' surf ace-tension- ofv the com‘
position; Thus‘ therexisz no coagulatiomonthe
of the: sheet or layer 4|:- are: regular-'and~.trim.=
as. in the‘: manufacture. of’ laminated, sheeting;
since the rollersr?? will ride- upon thez-ishe'etingh
plies ‘on the conveyor; andithe-ygluide-vwill .be-.-ele=~
which studs are in axial alignment transversely; 75: vatedas- thebeam | 8 isliftedirto. elevate: the doc-
7 2,404,5sa.
7 ,
I-torbladell. The arrangement issuch'as to ‘
maintain the bottom margins‘ of the guide plates
composite laminated sheeting being shown at 14 r
1 5‘! at all times in determinate spaced relation to
in. the drawings. The conveyor '|0 ,frictionally.
drives the pressure roll ‘H to provide the pull for
the work, notwithstanding shrinkage in the thick-'1
ness of the Work as it is dried during passage
throughthe oven l2.
r011 '|| to‘be pressedand adhered thereby to the
last constructed laminated sheet thereon, -.the
withdrawing the material from the roll 61 of liner I
and sheeting.
' , In the manufacture of single-ply sheeting, the
For withdrawing the composite sheet 14 fromv
the conveyor I0, the framework ||~'has a pair
a pairvof suitable upright brackets 64, ,64, Fig. 2, 10 of brackets 16, 16 rising therefrom on. opposite
sides of said conveyor, said brackets being located
are mounted upon the framework | |, at the end
in the horizontal region of the conveyor between
thereof beyondsaid oven, and on opposite sides
the brackets ‘l0 and the inclined region of’the
of the conveyor |0._‘ The brackets 64 are adapt
conveyor which begins at the supporting roller
ed to support, at a'position above the conveyor,
a roll 65 of liner 66, and to guide a wind up roll 15 34. Said brackets comprise means'for rotatably
supporting a liner-supply ,roll 11, and include
61 that rests upon the conveyor. The roll 66 is
guidesfor a pair of laterally spacedrapart cradle
frictionally driven bythe conveyor to strip the
rolls ‘I8, 78 that span the conveyor and restupon
sheet 4| therefrom and wind it about itself, the
‘ layer 4| is stripped from the conveyor;|0 imme
; diately after it leavesithe Oven I2.‘ To this end
1 liner 66 Withdrawn from the roll 65 thereof being
the work thereon so as to be frictionally driven
1 interposed between theconvolutions of the sheet 20 thereby, said cradle rolls supporting a work-re
winding roll 19 and frictionally driving the same.
material 4|. In the manufacture of laminated
The brackets 15 include guide means for the roll
‘ sheeting, the conveyor makes several passes
19, and also carry a guide-rod 80 over which
through the apparatus to build up a plural-ply
liner fromthe roll 11 passes as it is withdrawn
‘ sheet that eventually is stripped from the con
veyor in the manner described and by the ap-, 25
In operation, the composite sheet 14 is carried
paratus just described. .In cases where it may _‘
beneath the two cradle rolls 18 so as to drive the
1be desirable for the sheet 4| to remain on the
same and the wind-up roll 19 supported there
by. The sheet 14 is stripped from the conveyor
30 H] by the second cradle roll 18, and passes part
presently to be described.
ly about the same, thence passing to_ the re-.
When producing laminated sheeting of greater
winding roll 19 to be wound thereabout with a
; than average thickness, a somewhat di?erent pro
liner withdrawn from the roll 11 thereof. It will
, cedure may be employed by the apparatus.- In
be obvious that the device for Withdrawing the
1such case there ?rst is produced a laminated
. sheet of half the number of plies desired in they 35 composite sheet 14 from the conveyor is equally
well adapted for withdrawing the sheet 4| there
finished sheet. The ?rst-produced laminated
from, while said sheet is in single-ply form or
sheet 'is stripped from the conveyor and wrapped
conveyor for a slightly longer period, it will be
stripped from-the conveyor by a take-off. device
when it is in laminated form.’
in a liner in‘ the manner hereinbefore described.
‘The speed of the conveyor and the temperature
‘ of the oven l2 are regulated and coordinated so
By means of the apparatus described it is possi-,
40 ble to produce improved latex rubber ‘sheeting
varying from the relatively thin material em
;that the laminated sheet is about 90% to 95%
ployed for hospital sheeting to the relatively thick,
1 dry, the remaining moisture therein causing the‘
laminated material employed in the manufacture
surface thereof to be somewhat-tacky. There-l
of self-sealingliquid fuel cells. Best results are
aftenanother laminated sheet is built up on
-' obtained in the manufacture of hospital sheeting
the conveyor, and when it has attained the. de
when a substantially non-'heat-sensitive latex’ is
sired number of plies, the ?rst-constructed sheet
is progressively fed back onto the conveyor where
on it adheres to the last-constructed sheet- there- '
on, and then both sheets are removed from the
conveyor. .Theoperations of assembling the two
employed, such as the following:
. > V
‘ -
Latex (60%) _________________________ __ 166'“.
Water ________________________________ _- ;3.3
ilaminated- sheets and then removing them from
Zinc oxide dispersion (50%) ______ __'_____
' 6.5‘
the conveyor are effected at the left hand rendeof
Sulfur dispersion (50%) _____'_' _________ __
the conveyor, the apparatus ' employed being
Sodium diethyl dithiocarbamate solution
shown in Fig. _1. ..
Referring to Fig. i of the drawings, it will be
,seen that the end portion of ‘the framework II
has a pair of brackets 10, ‘I0 rising therefrom at
., opposite sides of the conveyor l0, said brackets
‘ comprising means for rotatably supporting a? rollv
‘B1 of liner and sheet material, and means for
‘guiding a pressure roll 1| that rests upon the
1 conveyor l0 and a liner rewind roll "that rests
__________________ __'_ ________ __
Sodium silicate solution (40%) _________ __
Although this composition does not immediately
gel uponv entering the oven, the relative thinness
of the sheet (about .015") and the surface ten-.
sion of the composition combine to prevent appre-J.
' ciable spreading and thinning of the sheet at the
lateral margins thereof. In‘ the manufacture of
rubber sheeting for fuel cells, which comprise a.
1 upon the pressure roll ‘H. A pair of cradle rolls
1‘I3, 13 disposed in spaced apart relation parallel 65 plurality of plies, straight 60% latex generally is
used, without the addition of gellingeor vulcaniz
fto the pressure roll '|| support the conveyor ||l
ing agents. In such case it is possible to spread
. below said roll ‘II, the arrangement enabling the
:conveyor to sag slightly between said rolls 73
a layer of latex as thick as .040 inch withoutv ap
:whereby the pressure roll'has greater area of‘ '
1 contact with the conveyor and sheet material
preciable thinning at the margins thereof.
‘ thereon. In operation, the liner 66 and laminated
sheet 4| are withdrawn from the roll 61 and pass
over the liner rewind roll 12 .whereoni the liner
When spreading very thick ?lms (.050 inch or
more) it is desirable to use heat-sensitized’ latex,
and in some cases to employ the electrical heat
ing elements H6. Heat sensitive latex such as
the following has been found to give satisfactory
separates from the sheet 4| and is rewound, the
latter passing around and under the pressure‘ 75
'j-posi-tion ‘to ‘limit ilateralzspreading lthere'o?band
>mean's on said guides adj acen't i'one rend’ithereof
pivotally :engaging said : supporting irrod whereby
the latter- v‘constitutes a partial support ‘for the
iso'dium =¢diethy1 :dithiocarbamate .solution
(25%) ___l ____ -7 ___________________ _;
‘DarvaniN'o'?lisolution '1i(5'(l% )1 _‘____' _____ __'
1'5. Apparatus if'ori' makingv sheet material, “said
"apparatus comprising ~ an {endless \ conveyor and
-~ 5.0
wlmea'nslfor driving the samefa Idoctor lbladei span
Calcium sulfate dispersion _(‘6'.6.%') ___"_____ 12.4
11 Sodiumr salt5 or » polymerizedlalkylearyl-sulfonic 'acids.
ninglthe conveyor, a vertically-adjustable lbéam
spanning ‘theiconveyoritoiwhichf't-he doctor blade
is adjustabl-ylattaohed, means for maintaining'ia
"pool I of‘ fluent composition ion the’ conveyorwon
’ The, apparatus also'adaptahle for useiinfth'e
stiguous’ with oners'ide {Ol'ilthefdo?tpl‘l‘blatlé, and
manufacture of ‘sheeting or, sponge or cellular
rubber. In this case the latex is beatenjor frothed,
‘laterallgui'desfor sa'idipool o'f‘compositiontolimit ,
a‘iter which .agelling, vagent‘is..added. .Because 15 -lateral'spreading'thereof, eaoh'of said guides‘éom
the .froth .‘is '_less .?u’ent ‘fthan unfrdthed I’ latex, it I "prising a main plateith'at is pivotally connected
=-to -said'lbeam',sa guide platerremovablyand adjust;
,may' be spread mime .con'veyorjito greater'lthick
ably»'secured it‘osa‘i‘dzmain plate, and means car
ness. "Thusjitiis possible tooperatethe apparatus
tried by said guide plate adapted‘ for rolling» len
withalblade settingof $5 produce sponge
sheetingv having an ultimate thickness ofsiz inch. v20 . gagement'with'theisurfaoe- ofltheconveyor. >
"6. .A combination =asr‘de'?ned in claim-ill wherein
‘From the ‘foregoing‘it wilLbe. apparent-thatthe
invention provides in
‘theylast'me'nti'on'e'd ‘means comprises-a roller, and
improved .manner .for
the manufacture .of, latex rubber sheeting, both
single (ply and laminated, ‘and achieves .me other .
objects set out ‘in v.theioregoing. statement .of 7 ob- '
an arm to ‘the ‘free endof which ‘the .r‘one‘r' ~is
journaled, the armi being connected to the guide
.plate ‘and ‘constituting an ~'extension ‘thereof. ' "
‘l7. ' Acombination-a'sl de?nedin-claimill --wh'ere'in
:the last mentioned‘means comprises a roller, 1 an
arm‘ to the Ffreerend of which Ith'eroller1‘is lj'ou'r
ing, ‘the invention may be utilized without ma
naled, the arm being pivotally connected at its
terial alteration for applying a coating of latex
opposite end to the guide plate, and means on
rubber to fabric, and the latter may be untreated, 30 the
latter for adjusting the angular position of
or it may have a skim- coating of rubber on one
In-additiomto-the manufacture of latex sheet
said arm with relation thereto.
or both sides thereof. To apply latex to ,fabric it
is only necessary to run the latter through the
8. Apparatus for making sheet material, said
apparatus comprising an endless conveyor and
means for driving the same, a doctor blade span
ning the upper reach of the conveyor, a beam
apparatus while supported upon the conveyor lll._
Modi?cation may be resorted to without de-'
parting from the spirit of the invention, or the
scope thereof as de?ned by the appended claims.
What is claimed is:
spanning the conveyor and having the doctor
blade attached thereto, the respective ends of said - '
beam being formed with trunnions, slide blocks
1. Apparatus for making sheet material, said
apparatus comprising an endless conveyor and 40 at opposite sides of the conveyor in which said
trunnions are journaled, means for adjusting the
means for driving the same, a doctor blade span
elevation of the slide blocks in unison, ?anges
ning a horizontally disposed reach of the con
formed on the opposite'end portions of the beam,
veyor, a vertically adjustable beam spanning the
which ?anges are formed with arcuate slots that
conveyor and to which'the doctor blade is at
are concentric with the trunnions of the beam,
tached, means for maintaining a pool of ?uent
and fastening means that extend through said
composition on the conveyor against one side of
slots and adjustably secure said ?anges to the
the doctor blade, lateral guides for said pool of
composition to limit lateral spreading thereof,
means on the beam constituting pivotal support
slide blocks for retaining the beam in determinate
angular relation to the conveyor.
for one end portion of each of said guides, and 50
means carried by the other ‘end portion of each
guide adapted for rolling engagement with the
9. In apparatus for the ‘continuous. manufac
ture of sheet rubber from rubber latex, the. com
bination of a movable supporting surface hav
ing a region inclined upwardly in the direction
conveyor to assist in the support of the guides.
of normal movement of said surface, means for
2. A combination as de?ned in claim 1 whereof
delivering latex composition to said inclined re
the rolling means carried by each guide projects 55 gion, a doctor blade operably- associated with said
laterally thereof so that upon transposition of
surface at a point above the point at which said'
the lateral guides said means will roll upon sheet
latex composition is delivered to said surface
material that may be on the conveyor.
adaptedto spread said latex composition and
3. A combination as de?ned in claim 1 in which
60 produce a layer of said composition of uniform
the means on the beam that constitutes a pivotal
support for one end portion of the guides is ad
‘thickness, lateral guides positioned adjacent said
inclined region for limiting the lateral spreading .
of said layer of latex composition, the, bottom ‘
justable relatively of the beam.
4. Apparatus for making sheet material, said
apparatus comprising an endless conveyor and
' means for driving the same, a doctor bladev span
ning a horizontally disposed reach of the con- '
margins of said guides being spaced from said
65 supporting surface, the spacing of the margins
veyor, a vertically adjustable beam spanning the
conveyor and to which the doctor blade is at- V
tached, means for maintaining a pool of ?uent
from said supporting surface being su?icient’only
to prevent pinching of the latex composition be
tween said guides and said surface while prevent
ing the flow of latex composition between‘said
guides and said surface‘ due to surface tension of
composition on the conveyor against one side of 70 the composition, the spacing between'said guides
the doctor blade, angularly adjustable arms pro
jecting laterally from said beam over said pool, a
and said surface also progressively increasing lon
gitudinally thereof in a direction away-from a
point adjacent said doctor blade and opposite to
supporting rod carried by said arms at the free
end thereof, lateral guides for said pool of com 75 the direction of normal movement of said surface.
'10; The‘ combination‘ as set 'forthin claim 9
wherein the margins of said ‘guides are spaced
{approximately .002 of aninch from- said movable
surfaceat a point adjacent said doctor blade?and
are spaced approximately .010 of an inch from, ,
psaidlmovable surface at the opposite ends of-said
j margins and said doctor blade is spaced approxiw
mately .040 of an inch from said movable surface.
tuting pivotal support for one end of eachof said
guides and means carried by the other ‘end of
said guides adapted for rolling engagement .with
said conveyor to assist 'inthe support of'said
14. In apparatus for making sheet material,
, >11. vIn combination with the apparatus set forth
‘the combination of a horizontally arranged end
in claim 9, means carried by the ends of said
less conveyor and means for driving the same, a
guides remote from said doctor blade adapted for
rolling engagement with said movable support-v
ing surface to assist inlthe support of said guides.
doctor blade operatively associatedwith the up
per reach ,of the conveyor in spaced relation to
one end thereof, means for maintaining a bank
or pool of ?uent composition of uniform thick
ness against the front of the doctor bladeto be
» ' '12. ,In combination with the apparatus set forth
’ position to limit lateral spreading thereof, means
eon said doctor blade supporting means consti
in claim 9, an oven immediately adjacent said‘
doctor blade through which said supporting sur
face is adapted to move: for treating said layer of ‘
spreadby said blade upon the conveyor passing
thereunder, lateral guides for said pool of mate
rial to prevent. lateral spreading thereof, an oven
havingits receiving end located immediately ad
13. Apparatus for continuous‘ manufacture of
sheet rubber fromirubber latex composition, said {20 jacent. and behind‘ the doctor blade and through
which the conveyor passes to effect gelling and
apparatus comprising an endless conveyor, a. doc
latex composition and converting it to rubber. '
tor blade'spanning a substantiallyhorizontally >
disposed reach of said conveyor, vertically ad
‘ 'justable supporting ‘means spanning said con
substantial drying of the sheet, of composition
spread thereon, means for progressively placing a
pre-formed sheet on the conveyor in superposed ,
veyor and to which said doctor blade is attached, 25 relation to ‘a sheet of material spread thereon,
and take-oil‘ ‘means for removing both sheets as
means for maintaining a pool of said latex com
' position on said conveyor against one side of said
doctor blade, lateral guides for said pool of com
a unit from the conveyor.
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