US1618799A - Waxing machine and the like - Google Patents

Description

Feb, 22, 1927.

S. J. BLUM WAXING MACHINE AND THE LIKE Filed Feb. 16, 1925 6 Sheets-Sheet L Feb. 22, 1927'.

' 1,618,799 5. J. BLUM I WAXING MACHINE AND THE LIKE Filed Feb. l6. 1925 e Sheets-Sheet 2 Feb. 22,1927.

5. J. BLUM waxme MACHINE AND THE LIKE Filed Feb. 16'. 1925 6 Sheets-Sheat 3 Feb. 22, 1927.

S. J. 4 BLUM 'WAxING MACHINE AND THE LIKE Filed Feb. 16, L925 6 Sheets-Shut 4 eh 9 s. .1. BLUM WAXING MACHINE AND THE LIKE Filed Feb. 1 L925, s'snee cs-sneet 5 Patented Feb. 22, 1927.

UNITED ,STATES PATENT OFFICE.

SIDNEY J. BLUM, OF CHICAGO, Il I LLINOIS, ASSIGNOE TCREGENSTEIN-VEEDER CO., OF

CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

WAXING MACHINE AND THE LIKE.

Applicatioir filed February 16, 1925. Serial No. 9.441.

This invention has to do with certain improvements in machines for waxing paper board and other fibrous material. The invention has reference particularly to improvements in' machines for applying such wax as paraiiin to paper board intended for which simply apply the wax to the surface of the board. Machines embodying the features of the present invention cause the wax to penetrate into the very heart of the fiber board so as to give a very perfect impregna- .tion throughout substantially the entire thickness thereof, whereas previous ma,- chines with which I am familiar simply apply the wax to the surface of the boardiwithout substantial impregnation into the body thereof. Paperboard so treated is ordinarily intended for an entirely different class of service from that which is fully impregnated, being extensively used for such purposes as the manufacture of cartonsfor ice cream, butter, etc.

One of the objects of the present invention is to pro-videa machine of such construction that the operation of effectively impregnating the board is performed substan tially without leaving a coating or deposit of wax on the exposed surfaces thereof. This is a very desirable resultfor board intended for the particular class of service heretofore referred to.

Another feature of the invention relates to the provision of a machine of such construction that the paper board may be passed through. the same with little, if any. deflec- -tion or bending; This will make it possible tousc'machincsnf the present invention for the treatment of relatively heavy material such as. it is desirable to usein the manufacture of automobile-panels, which heavy material can not be sharply-bent without cracking or other injurious cfi'ect.

Another feature of the invention-relates to the provision of a construction such that either lndividual boards or continuous strips of the material may be fed therethrough,

givingegually desirable and satisfactory resuits in either case.

A further feature of the invention relates to the provision of means for cooling the sheets or the treated strip as delivered from the machine, so that the need of providing very large storage spaces for the treated 'stock'can be eliminated. The desirability of this feature will be readily appreciated when it is understood that the stock must be cooled to substantially the normal temperature before it can be used for other-steps of process in-fthe manufacture of the panels, and when it is understood that in some cases it is necessary to allow the stock to stand for two or three days when piled upbefore sufficiently cooled. I

Another feature of the invention relates to the provision of a machine of such construction that stock of considerable variation of thickness may be treated therein without the need of material change or adjustment of'the machine itself. In any case, the machine will effectively impregnate the wax int0 the body of the fibrous stock and deliver cases, however, it may be desirable to use the machine for the treatment of stock which has already been trimmed; and a further feature of the invention relates to the provision of rolls of such a nature and construction that they will not perceptibly damage the edges of the stock passing between them notwithstanding the pressure which they exert thereon, y I w A further feature of the invention relates to the vprovision of means whereby as the wax, such as paraffin, is consumed by impregnation into the body of the boards, it

may be replenish-ed either continuously or' from time to time by the supply of new blocks of the same, and substantially without any undesirable cooling of the main body of the hot wax which, passes to the rolls.

result in heating the rolls to the desif'ed temperature when using commercial parafiin wax.

Another feature relates tothe provision of means for keeping the rolls clean and in good operating condition continuously dur-.

ing the impregnating process.

Another feature of the invention relates to the provision of an arrangement whereby it is possible to im regnate the fiber board from either one or th surfaces as desired. Also to make provision for securing this result when impregnating either individual blanks or a continuous sheet of material.

The impregnation of the wax into the body of the fiber board serves to stiffen or harden the board as well as water proofing the same most effectively. Furthermore, fiber boards which have the wax applied to the surfaces cannot be satisfactorily used for panels of automobile bodies, since rubber cement and other adhesives commonly in use i or securing the upholstery clothand leather in place will not stick to the exposed was of such a surface. On the contrary, these adhesives will very effectively perform their function when applied to the surface of a wax impregnated fiber board, the surface of which has been GflGCtlXGly cleaned by removal of excess impregnated wax;

In addition to the foregoing the wax remainin on the surface and impregnated into the body of the board easilychips on and will rapidly erode away under the infiuonce of the elements; continuous use of impregnated boards under the most adverse conditions does not materially affect them and does not reduce their water proofing qualities.

From the above as well as other facts it a ppears that there is a great distinction between wax impregnated board as compared with surface coated board: and the structure of the resent invention is designed with a particu or view of'the requirements of impregnating the wax into the body of thefiber board substantially without leaving any surface coating of waxns distinguished from maohinw whose primary fimction'is toestablish a surface coating substantially without imp on.

Another of the invention is to provide a very simple condruction of machine. one having relatively few parts of god M5021, and one which can be readily assembled and ".ilintained at low cost. Other objects nnduses of -the invention will appear from a detailed description of the same, which consists in thefcatures of construction and combinations of parts hereinafter described and claimed.

In the drawings:

Figure 1 shows a side elevation of a machine embodying the features of the present invention;

Fig, 2 shows an end elevation corresponding to Fig.1;

Fig. 3 shows a plan view corresponding to Fig. 1;

Fig. shows a longitudinal section substantially on the line 4-4. of Fig. 3, looking in the direction of the arrows;

Fig. 5 shows a fragmentary section on enlarged scale through the end portions of a pair of rolls, together with the bearings and steam connections, being a section on the line 5-5 of Fig. 1, looking in the direction of the arrows, but on enlarged scale;

Fig. 6 shows a fragmentary section through a piece of fiber board impregnated from both surfaces;

Fig. 7 shows a view similar to that of Fig. (3, with the exception that the. board is only impregnated from one surface;

Fig. 8 shows a section through a modified form of roll having rubber surfaces so .as to avoid damage to the edges of precut blanks;

Fig. 9 shows diagrammatically 'a plan embodying the machine of Figs. 1 to 5, inclusive, when the same .is used for the impregn-atioi' of individual sheets, together with cooll g rolls for cooling said sheets; and

Fig. 10 shows a view similar to that of Fig. 9, with the exception that the plan is adapted for the impregnation of a continuons strip of material which is thereafter cooled and taken onto a continuous roll.

- Referring first to Figures 1, 2, 3 and 4 in particular, the machine therein illustrated includcs'side frames 12 and 13 which are preferably mounted upon floor girders 14 and 15 which serve not only to support the side frames but also retain them at the desired separation.

Mounted upon the upper portions of said side frames are the horizontal sills 16 and 17 which, in the construction illustrated, ex-

tend beyond the side frames themselves and have their projecting end portions supported by posts 18, as indicated particularly-in Figs. 1 and 4.

Mounted on the side sills 16 and 17 are the U-shapcd bearing guides 19, 20, 21 and 22, the same being located in pairs at the two sides of the machine. Fixed rollers 23 and 24 have their end portions journaled in the pairs of guide blocks 19and 20, respectively, and above these fixed rollers are placed'the companion adjustable rollers 25 and 26 which also have their end portions journalcd in the pairs of end blocks 19 and 20, respectively. The pairs of rollers 23 and p 25, and 24 and 26, respectively, are what I will designate the lmpregnating rollers,

since they serve the function of initially applying the wax to the hber board and 1mpregnating it therein.

There are also the fixed rollers 27 and 28 'which' have their end portions journaled with respect to the pairs of blocks 21 and 22, respectively, and above them are the adjustable rollers 29 and 30 which have their end portions also journaled with respect to the pairs of end blocks 21 and 22, respectivetively, said hand wheels transmitting their, force to the ournals of then respective rolls by spring pressure.

Beneath the rollers 23 and 24 is a bath for wax 535.. This bath may be made in any convenient manner, but preferably includes a steam chamber so at its bottom side by means of which it may be heated to heat the wax. Ordinarily, paraflin will be used for the wax and the temperature of steam at twenty-five-thirty pounds per square inch will maintain the same at the proper temperature. w

The rolls 23 and 24 will be maintained at the desired temperature by the temperature of the molten wax. but it is desirable to also heat the companion rolls 25 and 26. It is also desirable to heat the cleaning rollers 27, 28. 29 and 30. All of the rolls 25 to 30 inclusive may be conveniently heated by the use of steam, making the rolls hollow and providing suitable joints for the delivery of steam and removal of water of condensation. For this purpose. a.construetion' such as that shown in detail in Fig. 5 maybe used. The hollow roll 25 is provided with a hollow shaft 37 at one end which is journaled in the bearing block. already referred to.-. A steam connection 38 reaches into the end of the extension 37 and is packed by a packing 39. Live steam for all of the rolls is supplied by a pipe 40 to a horizontal feed' er pipe 41 which in turn connects to the hollow shafts of all of the rolls 25, 2G. and 30. Another line 42 also supplies live steam to the pipe 43 for the hollow shafts of the rolls 27 and 29. Preferably a drain pipe' 44 extends along the side of the machine at a point beneath the live steam pipe 41 and is connected to the respective hollow shafts by short vertical connections, such as 45, so that water of condensation from the upper rolls will collect in this pipe 44 and may be removed. by the pipe 46. This pipe 46 and also pipe 43 connect into another horizontal pipe 47 which supplies steam to the steam jacket'beneath the wax bath 35. Another pipe 48 leads downward from another portion of the steam jacket 4'13, preferably at a lower elevation, so as to continuously drain water of condensation from the bath 3(5 and deliver the same to a suitable steam trap.

It is noted that in view of the fact that the rolls 25, 26, 29 and 30 are vertically adjustable, as already explained, there should be allowed a certain amount of play at the ends thereof where the steam pipes are con nected. The use of packing, such as 39, at these points will permit of the necessary amount of adjustment without strain and without undue leakage.

Each of the rolls 23 and 24 is provided with end shafts 49 reaching through the bearing blocks, and packings 50 are preferably provided at these points so as to prevent any'undue leakage of wax. Any suitable arrangement may be used for driving all of the rolls in the proper directions and at the proper speeds. The arrangement illustrated is convenient for this purpose and includes the following instrumentalities:

A main drive shaft 51 reaches across the lower portion of the machine between the side brackets 12.and 13 at which points it is journaled. This shaft is preferably driven by a pulley 52 and belt 53 from any convenient source of power. 0

At the near side of the machine, when viewed in Fig. 1, is a ack shaft 54 journaled in the side frame 12 and in an outriding bracket 55. This jack shaft 54 carries a gear 56 which is driven by the pinion 57 on the shaft 51. The jack shaft 54 carries a sprocket driving a chain 58, which chain passesover sprocket wheels on the projecting ends of the shafts of all of the rolls 2426, 27 -29, and 2830, as well as a take up sprocket 59. The chain is passed over the various sprockets, in the proper directions to insure rotationof all of the rolls for feed in the same direction. At the opposite end of the machine is another sprocket 60 on the jack shaft 54, which drives the rolls 23 and 25 by means of another chain (51v passing over sprockets on the projecting ends of the shafts of said rolls, as well as a take up sprocket ti2, all as clearly evident from Fig. 4. These rolls also are driven in the proper direction for feed in the same direction as the other rolls, namely, towards the left in Figs. 1 and 4..

At the right hand side of the machine, when viewed as in Figs. 1, 3, 4, 9, and 10, is a table 63 on which the boards of untreated stock may be piled. Between said table and the first pan of impregnating rolls 23 and 25 is located a guide plate 6 1; between the impregnating rolls 2325 and 24-26 is another guide plate (35; and between the impregnating rolls 21-426 and-,the cleaning rolls 2729 is another guide plate 66. These guide plates are respectively supported in any'convenient manner as by means of cross bars (37, 68 and 69, extending across the upper portion of the wax bath 35. Furthermore, the edges of the guide plates which lie adjacent to the respective rolls clear said rolls by an amount suitable to allow perfectly free rotation of the rolls and wax thereon without interference from the edges of the guide plates. The edges of the guide plates are also preferably deflected downwards, as clearly shown in Fig. 4, so as to allow the edges of the boards under treatment to tilt down slightly as they pass'between the consecutive pairs of rolls.

Beneath the cleaning rolls 27-29 and 2830 is placed a pan 70 for the collection of such wax as may drip or be scraped from them after removal from the surface of the boards. This wax may be removed from time to time and returned to the melting bath:

The wax rolls 23 and 24 constantly dip beneath the surface of the wax in the bath 35 and carry a constant film of said wax up against the bottom surfaces of the boards for treatment. The pressure exerted by the pairs of impregnating rolls, together with the temperature of the wax and the rolls, will insure thorough impregnation of the under sides of the boards with the wax. This will insure single surface impregnation.

Adjacent to the upper impregnating rolls 25 and 26 there are the pans 71 and 72 carried by end blocks such as 73. These end blocks are in turn slidably mounted with respect to the bearing brackets 19 and 20 at the two sides of the machine and they are preferably provided with hand wheels 74 and 75 by means of which said blocks 73 may lie-adjusted back and forth with respect to the impregnating rolls 25 and 26. On the lower portions of the pans 71 and 72 are the knife edges 76 and 77 which in turn may be adjusted with respect to their pans by adjustment screws 7 8. r

The constructions just ex lained are such asto make it possible to ring the knife edges 76 and 77 exactly parallel with their respective impregnating rolls, and to also adjust the clearance of said knife edges from the rolls to the exact amount desired according to the thickness of the film of wax which it is intended should be applied to the upper surface of the boards. These adjustment! can be readily made while the machine is in operation, since the hand wheels 7 1 and 75 are placed at a convenient elevation above the wax bath.

In order to establish a continuous supply of molten wax for the pans 71 and 72, as well as for other purposes, I have provided a rotary pump 79 preferably driven oil of the main shaft 51 by a belt 80 and'suitable pulleys. This pump connects with the lower portion of the-heated wax bath 35 by a suction pipe 81 through which the pump receives its supply of molten wax: a pipe 82 leads from the discharge side of the pump to a suitable elevation so as to deliver the molten wax to both of the pans 71 and 72 by the branch pipes 83 ad 84, respectively.

A valve 85 may be provided in the pipes 82 or in advance of the branches 3 and 84.

so that upon closing said valve the supply of molten wax to the pans 71 and 72 will be discontinued. 1th such operation, the ap- .plication of wax to the top surface of the boards may be stopped and they will receive wax only on their bottom surfaces for single surfaces impregnation.

It may sometimes be found desirable to make a supplemental application of wax to the surfaces of the boards either continuously or intermittently. and in addition to the wax which is usually applied by the impregnating rolls. I have, therefore, provided a pipe 89 leading along above the guide plates 65 and provided with perforations throughout its length through which the wax may be sprayed onto the top surface ofthe advancing board: and another pipe 89 leading along below the guide plates 65 and provided with perforations throughout its length through which thewax may be sprayed onto the bottom surface of the advancing board. The end portions of these wipes are joined together in the manner similar to that illustrated in Fig. 4. Leading from the pipe 82 is a branch 87 which connects with a pipe 86 running along beneath the guide plates 64 and connecting with the back ends of the pipes 89 and 89 and also connecting by a pipe 86 with the front ends of the pipes 89 and 89. A valve 88 is provided for controlling the delivery of wax through this circuit.

As the machine continues to operate. the. supply ofwax within the bath 3? will be diminished, and may be replenished either continuously or intermittem'ly. This may be done, for example, by periodically throwing blocks of paraffin into the bath, so that they will be melted. by the heat thereof. This operation is objectionable. however, since the introduction of each block will momentarily chill the bath and result in a somewhat irregular application of paraflin to the fiber board. v

I. therefore. prefer to melt the newly introduced wax by a preliminary operation. so that when it is introduced into the bath 35,

ber 91 at its bottom side into which is introduced live steam through a pipe 92, the water of condensation being removed through a pipe 93. Another pipe 94 leads from the bottom of the bath 90 to a point where it can discharge the molten wax into the bath 35, a valve 95 being provided in the pipe 94.

As the impregnated boards pass away from the impregnated rolls they usually carry a considerable excess of waxon their surfaces, and without further treatment this would solidify into an objectionable surface coating of wax. In order to remove the same, I have provided the two pairs of cleaning rolls 27-29 and 28-30, respectively. These are preferably heated as by the steam connections, already explained, so that when the fiber boards pass between them no chilling action will occur, but, on the contrary, the surface wax will be heated to such a temperature that it will run off very freely. The pressure exerted by the cleaning rolls will then serve very effectively to remove this surface wax. The major portion of the surface wax will be removed by the first pair of cleaning rolls 2729 and find its way into the pan 70, and the second pair of cleaning rolls 2830 will have only a relatively small amount of work to per-' form. Any wax removed by these rolls can be easily taken oif of the rolls by felt blocks 96 and 97 resting against the rolls, which blocks may be occasionally removed and cleaned by a suitable solvent.

The foregoing arrangement of surface .cleaning rolls in conjunction with wax imders 101 over which pass tapes 102 which "travel over other pulleys or cylinders properly located, so that as the fiber boards are delivered from the rolls 2 830 they are taken onto the tapes and carried by them to some other point. They may be removed from the tapes either by hand or automatically.

As the impregnated boards are delivered they have substantially the temperature of pulley 115.

the cleaning rolls 28 -30, which ordinarily will besubstantially that of the steam by which they are heated. If these impregnated boards are directly stacked together they will retain their heat for a long time, since by their very nature they are very poor conductors of heat. In many cases, it will be necessary to wait until the boards 'have cooled materially before they can be subjected to further operations. For example, they cannot be ordinarily trimmed or used in a die'cutting machine without being cooled substantially to a normal temperature.

In order to avoid the need of providing very large storage areas to accommodate the piles of treated boards, I prefer to'p'ass them directly tosuitable cooling'means such; as cylinders 103 and 104 illustrated diagrammatically in Fig. 10, said cylinders bein hollow and cooled by cold water introduce through the pipe 105 and removed throu h the pipe 106. These cylinders will imme iately cool the sheets to normal. tem" erature, so that they can be immediately elivered to a stacking machine 107 and thus built into cool piles 108.

I n some cases, it may be desirable to make provision for the treatment of a continuous strip of the fiber board. I have, therefore, in Fig. 10, illustrated diagrammatically a roll 109 of the untreaded material passing and thence over the guide roll 112 to the cooling rolls 103 and 104. The cooled strip may then be wound onto a drum 113 on a shaft driven by the belt 114 working over a When treating a continuous strip it will generally be desirable to use a brake 116 Working on the drum 109 and provided with a hand wheel 117 by means of which the brake can be adjusted according to the tension which it is desired to exert on the strip of material.

Ordinarily the impregnatin ing rolls will be made of cast iron or steel. As individual blanks of fiber board are fed between these rolls the edges of such blanks will necessarily be somewhat damaged due to the pressure exerted by the unyielding surfaces of the rolls. In order to avoid any damage to the edges of the blanks as they pass between the rolls, I have illustrated in Fig. 8 a cross section' of a modified form of roll' comprising a hollow roll of cast iron or other suitable metal 118, and provided with a surface coating of a layer of medium hard rubber 119. This rubber layer may be made of a thicknessasufficient to give the necessary amount of yieldability to avoid and cleandamage to the fiber board blanks, but" at ple, a thickness of approximately 1/ inch of rubber will be found very satisfactory in the case of a roll having a diameter of substantially five to six inches.

In Fig. 6 I have illustrated a cross section through a fragment of fiber board impregnated from both sides, such fact being evidenced by the presence of the stippling throughout its thickness. In Fig. 7 I have illustrated a similar fragment of board impregnated from only one sidewhich fact is similarly evidenced by the presence of stippling throughout only substantially onehalf of its'thickness. Y

\Vhile I have herein shown and described only certain embodiments of the features of my present invention, still I do not intend to limit myself to the same, except as I may do so in the claims.

I claim:

1. In a machine of the class described, the combination of two sets of impregnating rolls each comprising a pair of rolls in vertical alignment, the two sets being substantially in horizontal alignment with each other, a material bath beneath said sets and within which the lower roll of each pair opcrates, the upper rolls of both sets being hol low, means for supplying steam .to the interiors thereof, means for heating the material bath, a material pan adjacent to the upper roll of each set and establishing a material bath in direct association with such roll, the floor of each of said pans being adjustable horizontally to adjust the clearance of its edge with respect to the surface of the adjacent roll, two sets of cleaning rolls located beyond the impregnating roll in the direction of travel, each of said sets comprising two rolls in substantially vertical alignment and the two sets being located substantially in horizontal alignment, all of said rolls being hollow, means for introducing steam into said rolls to heat them, a dri pan beneath the cleaning rolls, blocksof'a sorbent material in contact with the cleaning rolls farthest removed from the impregnating rolls, means for simultaneously driv'in the rolls in the proper directions for co-or inate feed of material between them, adjustable mountings for all of the up er rolls, means for forcing the rolls of eac set together under adjustable "spring pressure, means for preheating the material and delivering the same in mo ten condition to the first mentioned bath, a material pump, meansffor delivering material therefrom to the pans adjacent to the upper impregnating rolls under control of the operator, and means for delivering material from said pump directly to the top and bottom faces of the material undergoin treatment, under control of the operator an independently of the baths, substantially as described.

2. In a. machine of the' class described, the

combination of two sets of impregnating rolls each comprising a pair of rolls in vertical alignment, the two sets being substantially in horizontal alignment with each other, a material bath beneath said sets and within which the lower roll of each pair'opcrates, the upper rolls of both sets being hollow, means for supplying steam to the interiors thereof, means for heating the material bath, a material pan adjacent to the upper roll of each set and establishing a material bath in direct association with such roll, the floor of each of said pans being adjustable horizontally to adjust the clearance of its edge with respect to the surface of the adjacent roll, two sets of cleaning rolls located beyond the impregnating rolls in the direction of travel, each of said sets comprising two rolls in substantially vertical alignment and the two sets being located substantially in horizontal alignment, all of said rolls being hollow, means for introducing steam into said rolls to heat them, a drip pan beneath the cleaning rolls, blocks of absorbent material in contact with the cleaning rolls farthest removed from the impregnating rolls, means for simultaneously driving the rolls in the proper directions for co-ordinate feed of material between them, adj ustable mountings for all of the upper rolls, means for forcing the rolls of each set together under adjustable spring pressure, means for preheating the material and delivering the same in molten condition to the first mentioned bath, a material pump, and means for delivering material therefrom to the pans adjacent o the upper impregnating rolls under control of the operator, substantially as described.

3. In a machine of the class described, the combinaion of two sets of impregnating rolls each comprising a nair of rolls in vertical alignment, the two sets being substantially in horizontal alignment with each other, a material bath beneath said sets and Within which the lower roll of each pair operates, the upper rolls of both sets being hollow, means for supplying steam to the interiors thereof, means for heating the material bath, a material pan adjacent to the upper roll of each set and establishing a material bath in direct association with such roll, the floor of each of said pans being adjustable horizontally to adjust the clearance of. its edge with respect to the surface of the adjacent roll, two sets of cleaning rolls located beyond the impregnat ng roll in the direction of travel, each of said sets comprising two rolls in substantially vertical alignment and the two sets being located substantially in horizontal alignment, all of said rolls be-. mg hollow, means for introducing steam into said rolls to heat them, a drip pan beneath the cleaning rolls, blocks of absorbent material in contact with the cleaning rolls farll thest removed from the impregnating rolls, means for simultaneously driving. the rolls in the proper directions'for co-ordinate feed of material between them, adjustable mountings for all of the upper rolls,means for forcing the rolls of each set together under adjustable spring pressure, a material pump, and means for delivering material therefrom to the pans adjacent to the upper impregnating rolls under control of the operator, substantially as described.

4. In a machine vof the class described, the

combination of two sets of impregnating rolls each comprising a palr of rolls in vertical alignment, the two sets being substantially in horizontal alignment with each other, a material bath beneath said sets and Within which the lowerroll of eaclr'pair operates, means for heating the upper rolls of both sets, a material pan adjacent to the upper roll of each set and establishing a ma terial bath in direct association with such roll, two sets of cleaning rolls located beyond the impregnating rolls in the direction of travel, each of said sets comprising two rolls in substantially vertical alignment and the two sets being located substantially in horizontal alignment, means for heating all of vsaid cleaning rolls, a drip beneath the cleaning rolls, means for simultaneously driving the rolls in the proper 'dlrectlons for co-ordinate feed of material between them,

adjustable mountings for all of the upper rolls, means for forcing the rolls of each set together under adjustable spring pressure, a material pump, and means for delivering material'therefrom to the pan adjacent to the upper impregnating rolls under control of the operator, substantially as described.

5. In a machine of the class described, the,

combination of two sets of impregnating rolls each comprising a pair of rolls in ver-- tical alignment, the two sets being substantially in horizontal alignment with each other,

a material bath beneath said sets and within which the lower roll of each pair operates,

for simultaneously driving the rolls in the proper directions for co-ordinate feed of material between them, a material pump,

and means for delivering material therefrom 'to the pan adjacent to the upper impregnating rolls under the control of the operator, substantially as described. 6.' In a machine of the class described, th combination of two sets of impregnating rolls each comprising a pair of rolls in vertical alignment, the twosets being substantially in horizontal alignment with each other, a material bath beneath said sets and within which the lower roll of each pair operates, means for heating the upper rolls of both sets, a material pan adjacent to the upper roll of each set and establishing a material bath in direct association with such roll, a floor for each 'ofsaid pans, horizontally adjustable towards and from its roll,

two sets of cleaning rolls located beyond the impregnating rolls in the direction of the travel, each of said sets comprising two rolls in substantially vertical alignment and the two sets being located substantially in horizontal alignment, means for heating all of said cleaning rolls, means for simultaneously driving the rolls in the proper directions for co ordinate feed of material be.- tween them, and means for delivering material to the pans adjacent to the upper impregnating rolls, substantially as described.

SIDNEY J. BLUM.

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