US1765777A - Apparatus for saturating fibrous material - Google Patents

Description

June 24,` 1930. A. E. scHuTTE A APPARATUS FOR 4SATURATNG- FIBROUS MATERIAL Filed Sept. '5, 1925 4 Sheets-Sheet SEEE :E

N www' I n l', I

June 24, 1930. A. E. SCHUTTE APPARATUS FOR SATURATING FIBROUS MATERIAL 4 Sheets-Sheet Filed Sept. 5 1925 m. kmr

June 24, 1930.

APPARATUS FOR SATURATING FIBROUS MATERIAL Filed Sept. 5, 1925 4 Sheets-Sheet 3 A. E. scHUTTE v Y, 1,765,777

Ju'ne 24, 1930. w A. E, scHUTTl I 1,765,777

APPARATUS FOR SATURATING IBROUS MATERIAL Filed sept. 5, 1925 4 sheets-sheet 4 Patented lJune 24, 1.9.30

UNITED STATES PATENT oli-FICE AUGUST E. SCHUTTE, AOItiNORTHBORO, MASSACHUSETTS, ASSIGNOR, 'BY MESNE ASSIGN- MENTS, TO THE PATENT AND LICENSING CORPORATION, OF BOSTON, MASSACHU- SETTS, A CORPORATION OF MASSACHUSETTS APPARATUS FOR SATUIQATING FIBROUS MATERIAL Application mea september This. invention in itsbroadest aspects rellates to the saturation or impregnation of t `fibrous materialV with waterprooing agents,

and more particularly concerns itself `with the saturation of the felt, paper, or equivallent fibrous material'commonly employed as the base or foundation for prepared roofing products, with asphalt or other similar bituminous waterproofing agents.

Before proceeding to a detailed "descripl tion of the present invention, however, in

order to more fully appreciate the results achleved thereby, itis desirable to discuss certain' known facts connected with theproduction of prepared rooting.

In the saturation of the sheet material or felt, so called, in the manufacture of times been directed toward a vprolonged saturating action or contact of the felt with asphalt, accomplished, for example, by passing-the felt through the asphalt a number of times. Such practice frequently results in a product which has been impaired through scorching, and which is consequently brittle. l l

If 'a coating or high melting point asphalt is substituted for the usualsaturating or low melting asphalt in saturating the' felt, as ordinarily (that is, by passing it through a bath of asphalt), because of the relatively high temperature necessary to fuse or render such coating asphalt molten andsufficiently liquid y.to ensure saturation, the felt isv markedly scorched owing to the. length? of contact necessary between the asphalt 4and For increasing the amount of asphalt, past practice has some- 5, 1925. serial No'. 54,612.

the felt in order to effect a satisfactory saturation thereof. Itis, however', highly desirable to emplo high melting point asphalt (particularly oxidized or blown asphalt, because of its desirable characteristics) for the saturation of the felt, as well as for the coating thereof, since by such practice the saturating and coating operations may be effected in a single operation. Moreover, the roofing produced thereby is of a more homogeneous or un1- form character, since the same 'asphalt eX- te'nds throughout the entire cross-section of thc sheet and also coats the surfaces thereof, instead of comprising an asphalt coating of different character than the saturating asphalt Within the sheet.v

Hence the object of the present invention is to provide an efficient method and apparatus for saturation of felt, without impairing the qualities of such felt, either with the usual saturating or low melting point asphalt or with the coating or high melting point asphalt, so-called, so that the felt will y contain a maximum amount of saturant.

Inaccordance with the present invention, provision is made to decrease the time of contact between the saturant and the felt and to increase the rate of the saturating action over past practice. Briefly stated, this is accomplished by forcing asphalt through the sheet, under pressure, during the immersion of the sheet in the bath, thereby effecting a saturation of the felt in a period of time sufficiently short so thatthe felt remains substantially unscorched and' unimpaired in quality. That is, instead of effecting a slow saturation of the felt by allowing it to remain in a bath of molten asphalt until it has been sufficiently penetrated or saturated, this invention provides for a rapid permeation of the felt, so that its constituent fibers and the interstitial spaces and voids therebetween are penetrated in a minimum period of time, by forcing a stream of asphalt under pressure therethrough.

In the lpractice of the present invention, a continuous sheet of felt is fed continuously into a saturating tank and under what may, for convenience of designation, be termed a l asphalt is forced against the-surface of the the core.

slotted' pressure box, submerged in the. sionedin unwinding, and this may bejaccoml molten asphalt, and through which molten plished' by supplying frictional .contact on sheet throughout its width, under pressure. .a pair o f brakes, indicated as a -whole at Y The asphalt impinges against one face of thev B, B, acting on elther .end-of the core. vEach- 70 felt and `passes through the pores` or interbrakecomprises an arm 7, oneend ojwhich stices of the felt, displacing the gases and is pivotally mounted on a` pivot or 8, on vapor contained therein, which are permitted Aa bracket 9 which is secured to an end wall to escape from the Aother face, andeec'ts the of the' Saturating tank'lO.' The arirr includes saturation or impregnation thereof in'a mini' ,an intermediateshoe portion 12v bearing mum period of time, so that either high ineltagainst the core, and` is providedA with a ing point asphalt .or low melting point asplurality of notches 13,.-near its other'end,

` phalt may be employed las desired, without saturant from the interstices within the yfelt,

as well as superficial asphalt on its surfaces, roll 3 and guided' into thesaturating tankml() the propellin -rolls may be arranged a-t a under il Slottedylmdllcal Pressure. 'bOX 111- 'f scorhingthe felt.

Moreover, in accordance with the present. invention, instead 'of arranging'. the usual paper may be adjusted or regulated by movpropelling rollsV engaging the saturated web. ing the hooks -I'OlIl 0.11 .13 0 3110151161' -Of the in close proximity to the saturating tank, as" notches, o`r by changing the value of the ordinarily, so that they not only propel the weightW. Any other suitable varrangement sheet through the tank but also exert a squeezfor supporting or tensioning v the .paper in A ing action on the saturated felt and remove lts unwinding may be employed, if desired,

point remote rom the tank, and the saturated dcatedata wliole'at .C ,ihrough the'SlQSi 0f sheet may be -cooled before reaching this lWhich molten asphalt is forced against fthe 'Y point, suiiicientlyto cause the saturant with. felt, and thence proceeds'upwardly from the' inthe felt tobe congealed .or hardened so .tankb'etween the usual pl'pelllng rolls Whlchy that it is not' removed by the propelling rolls.- serve to unwind it and draw it through the Provision may also* be made. to scrape 01* tank. The felt aCCOrdDgly'plSSS fiOm the otherwise removeany excess surface asphalt 1'011 3 Over a guide T011 15, the ends 0f Which' with any selected one ofwhich mayengage a' hook 14 on `which is suspended weights W. The amount of braking or tensioningV of the The felt is continuously unwound from the' from the sheetafter the saturating action and are journaled in bearings'aiorded by apair to `cool it prior to' thescraping action, of brackets 16, 16 onthe sidesof the saturat- The manner-- inwhich this invention .is ing tank 10V, and thence proceeds downwardly practiced, together with other objects and ad- IiIliO the '11101te11 asphalt, Whiqh S maintained; vantages incident thereto, will appear from lin Huid state by suitable heating means. Forthefollowing fmoren complete description this purpose, steam coils 18, supplied withl thereof' when taken in conjunction-With the] Steam, ,thIOllgh all inlet 19 *and fIOm'WhiCh' accompanying drawings, in which] condensate is `removed through alli-outlet 2O,A 'Figure 1 represents inside elevation an. are disposed in sinuous or'zigzag Courses. at

apparatus b -v which the'saturation of the felt-.may be accomplished. l

Figure 2 represents a plan view .of the Figure illustrates' a 3 3 of Figure 2a section on the line.- Figure 4 shows in enlarged detail .the pres sure box hereinafter described:

.saturating tank;

Figures 5 and 6 illustratejin larger vscale certain detail sections taken respectively on the lines 5-5 and 6L6of Figure l.

Figure'7 is a diagrammatic fand conventional representation of an ,apparatus in which the squeeze rolls 'areremote` from the' Referring to Figures 1 and 2 of thev draw-a ings 1 and 2 represent a pair lof spaced frames, on whicharoll of felt or paper '13 y may be supportedfor'unwin'din w.As Shown',

the roll`is carried by ,a cylin ric-al.A core 4,'

extending therethrough, terminating a 'pair of ends 5, 5 ofdi'minishing diameter, which are supported by the forked-upper 'bearlng portions 6, 6 ofthe frames., The roll o f paperzfelt is preferably steadied' or tenroll 22,' the ends of which'are journale'd in bearings furnished iby a lpair of brackets 24,

24 on the sides of the tank'.

ment immediately under the -box .'(thatiqs,

11o To maintain the felt in longitudinal aline'- 'without lateral displacement)',"as well 'as to prevent' to a practicable extent. side leakage 4115 t tween the box and the felt,th e 'box is vprov.

vided at its eXtremities-withfthe cylindrical or oozing of the asphalt fromA the space bei headersor plates 25 and A26, which also serve as vertical adjusting members for the box,- as will hereinafter be described. The moltenv aspha-lt is supplied to the,pre'ssure box.

Athrough the 'header 25 by'a` supply pipe 30, ,through va side portion 32 offthe tank, of

enlarged width. For'the emission of the asphalt, the presf sure box is provided on its' under side so as toface the felt passed thereunder, with a plurality oj-slots or openings 29, arranged diagonally side by side yand'through lwhich the asphalt is Iemitted (under suiiicient pressure iso- stance will depend upon the lporosity of the tion 46a of the bracket furnishing a bearing.

"thesurfaces of the sheet.

to be forced through the sheet passed there- Junder the force `of the asphalt under pres under and which obstructs the slots andthe sure. v j flow of asphalt therethrough. While -l have Provision is made to allow the raising and shown a cylindrical box or pipe having. inlowering of the pressure pipe from and into clined slots therein as a preferred form of the tank for the ,threading ofthe felt in pressure box, any other form of box of suit-ev initially commencing the saturating action, able form maybe employed. For example, as wellfas. for the tensioning of the felt', to

a rectangular box provided with a longitudimaintain it against the pressure box. To

nal slot or opening contacting with the` entire this end, the headers 25 and 26 are respecwidth of felt sheet may be employed, vif de-` tively provided with the upstanding lugs 33 sired The box is preferably maintained staand 34', to which are secured respectively the tionary i-n reference to the felt, -so that the vertically. movable threaded shafts 35 and entire width 4of the sheet will pass under a 36. Each shaft maybe secured as -by screwiow .of asphalt,'and as the sheet is fed lengthing its lower end into a suitably threaded wise a uniform saturation of the entire sheet aperture formed in the corresponding lug, will thereby be effected. The asphalt is vof and then ensuringthe fixing of the shaft by a coursesupplied under pressure to the box and nut 37' on the shaft bearing against the suris emitted through the slots, "impinging lface of the lug. Thevertical movementsof against one face of the felt thereunder and the shafts35-fand 36, respectively, may be efforcing its way through the poresyand inter-v ,fect'ed through internally threaded or nut stices of the sheet vto displace the gases and Amembers indicated generally at 38 and 39,

vapors rcontained therein, .which are per-4 the `members comprising respectively the p mitte'd to escape through the other face ,'th'ere-` bevel gears40 and 40?i at their upper ends,I by effecting athorough saturation of the felt hub portion 41 and 41a of diminished diamin a shorttime, and hence without scorchingr eter journale in a transverse vbar 42 secured it.l The brief period of immersion of the-felt to the frame work 43, 43 on the sides of the sheet prior an'd subsequent vto its passage untank, and collars 44 and` 44a engaging the 'i der the pressure box more or less supplements l ,underside of the transverse member, the the positive saturating action effected by the shoulders provided -by the gears and'collars.4

asphalt ,Under Pressure, and serves to coat preventing longitudinal play or motion of the As an' illustration of' certai n conditiens imparted to the nut members causes either which vmust be maintained in practicein an upward or downward motlonof the shafts,

nut members*` It will be seen that rotationorder to produce satisfactory saturating acandv that a simultaneousv rotation Vof both tion, -with an asphalt having a melting point .shafts mustbe effected in. order to maintain v.of about 220"V F., the molten asphalt is pref; the transverse alinement of the pressure b ox'. erably supplied atv a temperature between Rotation of the shaft'36 may be effected .by

400 to 425 F. and at the desired pressure as, a bevel gearv46 fixed at one end.of'a(s`tud shaft for example, about 15 pounds per square inch. 47 and cooperating with the bevel gear 40a. The pressure and temperature required -to The geel' 46 1S JOUIIlalQd ill. a' bflll'cted give'satisfactory results in any specific in- A`bracket 48'on the framework, theother porsheet.f Because ofthe inclined or diagonal .fOi a trDSWrSeShaft 51 which transmits form ofthe series of slots. as welli as the POWGI 950 the Othrnut member 38t0 effect -stationary.A relationship of the box in refer- 3. VGI'CC 111017251119111? 0f the Other Shaft 35..

ence tothe moving felt, the entire surface 'f ROaOIl 0f the-Shaft 5 1 iseifectedlOY.a

of the felt 'is subjected to the asphalt `under gear 49- al? the Outer @und 0f. :the Shaft 47,

'pressure and, as stated, the entire sheet is through a g substantially Iuniformly. penetrated. ,'More- .fixed t0 011e end 0f the Shaft 51- The'Ot-her ear 51a cooperating therewith,

Oven the 51m ofmolten asphalt always pres; end of the s haftl is journaled in a bearing en@ betweenjh'e v100x and the felt Serves as afforded by a'bifureatedbracket 52 on the j a lubricating film to permit the sheet to travel readily against the asphalt under pressure,

and in great measure diminishes'the frictional resistance that would ordinarily be encoun- 'l tered in moving felt against a stationary surface. lBecause of the submerged disposition" of the pressure box, splashing of the asphalt 0l/is precluded, and the 'momentum or energy of the asphalt under pressure is cushioned 'from being forced or torn away therefrom framework 43 and is provided with a gear 53 meshing with a gear 54 on one end of a stud .shaft 55 which is journaled inthe other bear'- ling. furnished by the bracket'52. At the inner end of the shaft 55 is a bevel gear 56, meshing' with the nut member38 and imparting rotationthereto in a direction opposite to the rotationof the nut member'39. The shaft 35 is hence threaded inJopp'osite-direction to they shaft 36; Rotation ofthe stud shaft 47 may be effected as by turning-a hand wheel 57 fixed at the outer end thereto, rotation'of the hand wheel simultanenously raising or lowering both ends of the pressure pipe while end of'the pipev 61 `is swiveled in one'end-62" maintaining the transverse alinement thereof. I

I' Anylther suitable means for threading the may be employed.

-boX in. all of its'positions while permitting paper or raising or lowering the pressure hoz;

the vertical mavement ofthe box. As shown,

' the end of the pipe 30 is screwed into one end 58a of an elbowed swivel joint member 58,

inthe socket eind 5 8b .of which is lswiveled one end' of a,4 connecting pipe 59. The other end of the pipe 59'is screwed into one-end 60l of a seondelbowed swivel joint member 60,

in the female en d 60b of which is swivel'ed one ervoir .'(notshown), from which hot molten fluid 'asphalt is supplied to the pressure box,

'end/of a pipe 61. -To take" up the angular movement of the -connecting pipe 59, the other 4ofa third swivel joint member 62, to 'the other end' of which is screwed a pipe` llne 63 which lcommunicates withthe pump and res- Any asphalt tending to rise beyond a fixed T1 g limit inthe 'tank is removed through an over'- 'owjpipe 80`communicatingI with the tank at one side thereof and may be circulatedback to the asphalt reservoir and reemployed for saturatingf The pipe '63 may be secured to the side of the tank by a bracket 65, to main' tain the pipe connections to the pump and reservoir stationary during-the vertical move ment o f thepressure'box. Any other'flekible -outlet pipe 90, and is recirculated back to arrangement for allowingthe pipe 30 to `be lraised from -or lowered into the tank 'may be felt passes forwardly and upwardly over the employed. l

After passage under the presslre box, the.

,- guide roll' 66, journaled in bearings furnished by brackets 67, 67 on the sides of the'tank, f and thence between the usual propelling and. vsqueezerollswhich serve topropel or draw the felt forward and to squeeze asphalt therefromf If desired, the rolls` 66 and 22 may be made adjustable toward and from. each other so as to'permit the variation or control of thearea of contact' between the felt andthe box C; The propelling rolls comprise the lower; rolls .69 journaled in bearing.boxes70, 70 on'l guides 7 6, 7 6 provided onl frame supports 71 i I 'fixed to thelsidesof the tank. The lower roll e is driven by' asprocket wheel96 fixedth'er'e'to atan outer end by a chain from a motor or I' counter'shaft (not shown). The uppe'rroll is positively driven at a peripheral speed equal tothe lower roll by a gear fixed at one Lend ofthe lower r'oll, meshing -jwith a gear 99 iixedto one. end ofthe upper ro'll. The upper press Iroll-72 is preferably vertically adjustable in reference to the lower roll. To this end, it is journaled in the bea`rings 73,-' 73, vertically movable in the ways -phalt in- .the felt 7 6, 7 6- andsupported at their ends by threaded rods 74,74 passing through threaded apertures in the ties or lstruts 75,- 7 5. The lowerl yend of each rod passesthrough and is journaled inpa` step bearingv afforded byI anupstandingboss 7 3? in each bearing 7 3, and is maintained longitudinally fixed in reference thereto by a pin 78 engaginglin a groove 79 at the'lower endof the rod. To theupperend of each rod 7 4 is fixed a. hand wheel 77,' :whereupon by turningtlis hand wheel, the bearing and the end ofthe rolls -17 2 supported-thereby may be raised "or lowered.

' Instead of locating the squeeze rolls in close proximity tothe saturating tank as described,

containinga maximum/amount of asphalt, is desired, I may locate the'se rolls at a point remote from the saturating tank and insert cooling nefans between theYtank andthe squeeze rolls, so as tocongeal the moltenasrior to passage therebejso when a supersaturated felt, thatis, a felt tween. In Figurel I have'diagrammatically" shown-such an arrangement, in whichthe roll .of feltor paper 3 is unwound as usual, and 'is guided over a -guide roll 81 downwardly into a tank'82containing a supply of 'molten asphalt, and under a guide roll 83, and over a guide roll 85, under the pressure box 86, supplied with asphalt under pressure by a supply pipe 87 from a indicated at 187. The -felt 'passes fromthe pressure pipe over the guide roll v88, under a guide roll 89, and thence'forwardly out of v10C# the tank. Any asphalt tending'to risev above al certaln fixed 'level overflows throughthe the asphalt supply. It be seen that as fluid asphalt. I f it were sent through a pair ofbcoacting` squeeze rolls. as usual, the felt pump conventionally would be compressed and a considerable por' tion` ofthe asphalt between the inters'tices of the felt-would be removed, in addition to the asphalton its surfaces. In order to have a' supersaturated'`sheet and to maintain the coating thereon, as stated, lprovision is' mader to congealthe asphltsuiiciently prior to its passage through' t e squeeze rolls,- so that upon dency to squeeze and remove asphalt therefromv111;* passage therebetween' there is no' ten While cooling of the sheet'may vbe ,accom- 'plishedby sufficient time cooling of the sheet is effected by causing .a cooling' medium to. playon'V the surface thereof. Accordingly,

as to cause air currents' vto play on the sheet;l

This lmayloe'- accomplished by blowingla'ir' of contact with 'the air of the atmosphere, as 'show'nin Figure \6,

as thevsheet. emerges .fromthe tank, itA passesby a nozzle 91 communicating with-a blower (not shown),v so

being preferable,since'in this case the hot lvapors and gases emanating from the sheet are removed, thus aiding inthe ventilation ofthe room.- The'amount'of cooling accomplished by the nozzle is preferably controlled so as'to maintain the asphalt in a semi-fluid condition. The cooling action tends toc0n. 'dense water vapor contained in the felt: and to cool any gascscontained therein, thereby forming apartial vacuum therewithin, 'which' causes the asphalt on the surfaces of the vsheet to contact as well as to be forced thereinto, and to thereby effect a more perfect saturation of the sheet. -After the preliminary cooling action, if desired, any superficial or yexcess asphalt on the surfaces of the'sheet maybe removed. 'Io this end,a a pair of/scrapers l92 and 93 may beA arranged to act on either Y side of the sheet ina manner to scrape any excess asphalt from its surfaces without, however, compressing the sheet to causeasphalt to' be squeezed from the interior thereof.

, After the scraping action, provision is made to complete the congealing of the asphalt so that upon passage between the usual propelling or feed rolls there is no tendency for the squeezing or removal of asphalt therefrom. The cooling may be effected by a pair of air lno zzles 94- and 95, arranged to act on eitherl or both-faces of the sheet and communicating with afan blower (not shown) whichhcauses air to be forced through or sucked into the nozzles, "thereby causing aircurrents to 'play onthe sheet. "The sheet then passes through the coacting squeeze rolls 96 and 97', which serve to 'propel the sheet through the various instrumentalities and to unwind it from the roll. The arrangement in Figure 7 is the preferable one if a' supersaturated sheet is to be, produced. Where desired, however, the arrangement shown-in lFigure 1 maybe employed and the compression or squeezing after saturation may be controlled by adjusting the upper propelling y roll in reference to the lower vroll and thereby varying the distance or -l clearance Vbetween the rolls, the pressure on the felt being so regulated'as to produce 'a sheet of the desired saturation.

Wh-ile I have described which only` one pressure pipe has been employed to ejfect a saturation of the felt, it is of course obvious that a plurality of such pressure units may b e employed toL effect a l more efficient saturation thereof. It is to be observed that the felt also contacts with the t bathof molten asphalt maintained in the saturating tank, but the over-all time ofcontact C0 with the asphalt has been materially diminished, so that thereis no vtendency for it to Vbecome scorched.l .Where surfaced roofings or shingles are manufactured, the saturated felt may be subsequently 'coated with asphalt,

C3 and further surfaced as by partially 'embed-- an apparatus inI ding mineral desired.

kOne of the advantages incident to the apparatus as herein described lies in the fact that the felt is first preliminarily treated with the asphalt as it enters the bath, causing a partial penetration by the molten asphalt into the sheet, after which in passing under the pressure box the saturation or complete yilling of the voids and interstices is completed, and finally as the sheet passes fromthe pressure box to the surface of the`bath, there is gritin`thc asphalt coating if l ensured the formation of a coating of asphalt on both faces of the sheet. This isall accomf plished with a minimum period of saturation and in an apparatus of relatively small size.

By` limiting the period of immersion, the asphalt lmayr be heated to high temperature.'-

without dleteriously affecting the liber of the felt. Furthermore, variations 1n the porosity of the felt may beA compensated for by varying the pressure upon the asphalt in the pressure'box. i

I-Iavingthus described an embodiment of this invention, it should be evident to those' skilled in the art that it 'is susceptible of va'- rious changesfand modifications without departing from its spirit or scope as defined in the appended claims.

WhatI claim is: v

1. In an apparatus of the character set forth, a tank for containing a bath of molten asphalt, a stationary cylindrical boxl submerged in the asphalt in said tank and provided with a plurality of'slots arranged diago'nally` side by side and 'spaced so that any plane' intersecting the cylinder and perpendicular to its axis passes through at least two of said slots, lmeans for supplying asphalt to said box, and rolls for propelling and guiding a sheet of fibrous material through said bath and in contact with said pressure box.

2. In -an apparatus of the character set forth, atank for containing a bath of molten with openings in a side wall thereof, means for supplying moltdi asphalt to said box under pressure, means for raisingand lowering said box from and into said tankwhile being 'supplied with asphalt, a supply pipe for said box, a pair of pipe sections pivotally connected to each other and tosaid box and said sup-A ply pipe, and rolls for propelling and guiding a sheet of brous material through said bath and underv said pressure box.y

v3. In a saturating apparatus of the character set forth, a tank forv containing a supply of lmolten asphalt, a pressure box submerged in the asphalt and having a portion per`fo' rated for the emission of asphalt under pressure, means for suppl ing molten asphalt under pressure to said ox, rolls located beyond the tank in the direction of feed Aof the 'sheet' for drawing saidsheet through said asyphaltand ,in contact with -sa-idbox, means Afor l' scraping excess material from the surfaces of said sheet located between said tanky and said propelling means, and means for cooling said sheet located between said scraping means and said rolls. A 4. In afsaturating apparatus. of the chars acter'set forth, a tankv for containing a sup- A plying of molten asphalt, a pressure box sub- 10 merged in the asphalt' and having a portion perforated to prevideemission ports, means for' supplying'molten asphalt under pressure to said-box, means located beyond the tank in the direction-of feed of theI sheet for drawl5-ingsaid sheetthrough'said asphalt and in contact with said box,- means for scraping-excess material from the surfaces of said sheet located between said tank and said propel, .ling means, and means for cooling said 'sheet arranged between said scraping means and said tank and between said scraping means and said propelling means.l

5,111 a saturatin'g apparatus ofthe charf acter set forth, a tank for containing a. sup- 2'5 ply of molten asphalt, means for maintaining ui'd the asphalt in said tank, a pressure boX submerged in theasphalt and'having .a-p/ortion perforated to provide emission ports, means for supplying molten asphalt under l 'pressure to said box, means for raising and lowering said box, from and into said asphalt, v .rolls for. drawing' said sheet through said as-v l phalt and in contact withv said pressure box, Scrapers positioned to' engage the surfaces of said sheet to removeexcess asphalt therefrom located between said tank and" said propelling rolls, and nozzles arranged to pass a cooling medium over thesurfaces of :said

sheet between usaid Scrapers andsaid tank 40 and between said scrapersandsaid5 propelling rolls.l 1 l v 6. Apparatus ofthe class described, com! prising means for maintaining a bathof liqv u elied asphalti'cmaterial, means for dijawJ p ing a sheetofindeterminate length `through "said bath, mea'ns'for subjecting one face of a l portion of the submerged sheet to asphalt at a pressure greater than that of the asphalton the opposite'face of the 'sheet,'a'nd means lo# l cated between said bath and said drawing v5: nature.-

.means for successively partially'cooling'the 1 sheet, sorapingfexcess asphalt from the-sheet, 'f and further cooling the-sheet.-

In'testimony `whereof I have aflixed my. sig,

AUGUST n; scHUTTE.

Y /Vn

Images