US2036168A - Paper machine and process of making paper - Google Patents

Description

Ausma 3 Slvlets-Sheer. l

mi 111W:

Filed Jan. 18.If 1934 "iillll H l G. A. ENGERT EH' AL PAPER MACHINE VAND PROCESS 0F MAKILNG PAPER March EL, m-

VE D Ceorye bzyef @orge '56072,

March 3l, 1936 G. A. ENGERT ET AL PAPER MACHINE AND PROCESS OF MAKING PAPER Filed Jan. 18, 1954 s sheets-sheet 2 IHIh-.Illlll Mardn 3L, NNE@ A ENGERT Er AL 2,036,168

PAPERA MACHINE AND PROCESS OF MAKING PAPER Filed Jan. 18, 1934 5 Sheets-Sheet 3 otented Mai'.V 31, i936 UNITED application .lanuary llt, litt, denial No. iilldldt 3l lilla-ima. (ill. tit-3d) Para This invention relates `to machines for deliqueiying liquid suspensions of solid :uit and for forming webs of said solid terials.

More speciiically this invention relates to improvements in paper machines of the type havmaterials in which vtwo separate types oi suspensions may be delivered to the vat.

Ulnother object of this invention is to provide a novel ieed pipe arrangement entering through the sides of the vat ior quietly and smoothly feed .ds shown in Figure l, the reierence numeral as ing an endless liquid pervious heit traveling ing stock to the vat pond. through a paper stock vat while entrained around Another obje-et oi this invention is to provide a a loi-ominous cylindrical member. The invendouble flow vat for papel mahile With 113W@ tion includes an eiilcient recirculation system for adjustable making boards.

10 white Water drained from the pulp stoel?. during Another Object Of this invention iS i0 DTViile m the web formation. a recovery system for liquids obtained in the lin our U. S. Patent No. lztlt dated .august .filtering 0f SuSpiSnSOHS- 29, i933, We have described and claimed a paper Another object oi this invention is to provide machine or the general type to which the fea, a recirculating system for white water materials l5 tures of the present invention are applicable. discharged from Cylinder VMS. 115

According to our present invention, a ioiami- A further object oi this invention is to provide nous cylinder is rotatably mounted in a pond a traveling seal and decirle ior cylinder types oi oi pulp stoclr in a stoel. vat which may be ied papel hints. l :trom iooth sides. 'The preferred vat has two ad.. ii still further object vof this invention is to no instable ing boards. a traveling liquid perprovide a process oi temine poner hai/ine diso@ vious belt such as a forming Wire or a tel-t is enn imei? hmdtlstics mi @Mh Sid@ trained about the periphery oi the cylinder. Mmmm Object 0f this lill/@mimiiS i301 lJiOVd@ Large drain openings are provided on each end oi" ai DTGCQSS 0f ile-Hdllciviig suspensions Whil in@ cylinder for maintaining the interior or in@ forms a mat oi the solid particles from the sus it cylinder substantially completely tree troni liquid. pensions and directly re-uses the liquid portion. 25 'li'ioe top part or the cylinder is sealed from im@ @ther and iurther ohjects will he apparent to atmosphere 'roy a sealing cap and dim-m of Sucthose sldlled in the art from the following speci tion noxes provided at tno sides or the sealing @cation and annexed iii-omnes which forro apart cap ior aiding the iormation oi a web on the iii@ Sptflcwiol dil traveling heit encircling the cylinder' as will he f 011 th@ dTdWlDBSI l .to more iully hereinafter described. liiigure l is a vertical 'cross sectional view oi a 'lliie stools ted to the vat enters in the sides of @inferred form 0f Stmk 'voti Tomtom@ Cylinder the vat through a plurality or pipes from a, header sealing cap thereior according to this invenieed pipe. c on. i

$5 The ends oi the cylinder' are sealed troni the Figur@ 1A i5 im @llgfd Hmmm' CMSS- 35 stool; pond by a novell adjustabi@ imi/@1mg smi sectional view of the drain opening .in the vat which also acts as a decirle strap for gauging the mm1@ Sh in Fgll Bind illustrdlmg altitudwiiith or in@ paper being formed on the cylinder. ont Size controlling mecha iol' the openins.

The Water drained from the interior oi the Figur@ 1B i5 im ellmed woken TQD @leve- "i cylinder and the drain or suction looses adjacent non@ V'W 0i th@ dl'fbil Opening ShGWl m Flglis i0 to the sealing cap is directly reused in the torni l @md Mt when Subsiwtmiuy along the um@ ing of paper pulp suspensions which are ied to Wm of mgm@ m the Stock pond mms, m our mme, .them is Figure 2 ,is a cross sectional view talren out no loss oi liquid except that relatively small mmmm along the une Hum of gle ow' 4" amount retained by the formed dlorous vvelo which hggl wenn@ 56m E0? me ends o Y ng M is transierredrto the presses and drlei's; Hovv- Fim@ '3 im ma elevmioml Viw with Dams ever, this amount or water lost from the system shown mammmatiwlly, of the liquids mcmzw ,15, more than replenished by Wam'ifmm Shower latina' apparatus according to this invention. 50 P1P@ Sed t0 Wh the o'mnous ilmimel'i' 0f Figure i is a fragmentary top plan view oi the to the cylinder.v apparatus shown in Figure 3.

It is therefore an object oi this invention to pie 5 is 1,- fmgmenmry man View of 0n@ @y provide a novel wet end ior paper machines. the drain hores.

Another object oi this invention is to provide its shown on tliedrags: 5: a double now vat ior liquid suspensions of .solid i indicates generally a stock vat having side walls Il and l2 and a base I3. The base i3 supports a plurality of castings I4 having arcuate "J8 respectively. Valves 73a, 14a, 'Mb and 15d are vals across the width of the vat and the faces l 4a thereon form supports for metal sheets I5 which extend across the width of the vat to form the vatI circle walls which define the pond I6 in which the cylinder il rotates.

The castings or frames I4 are slidable on tracks i3d in the bottom ll of the vat so that the size the vat circle may be varied. Each frame i4 ys provided on its bottom leg with a gear rack lib engaging a gear idc secured to an axle i402 mounted at the ends -in the end walls of the vat. @ne end of each axle Md extends through the vat wall and is provided with a lever for rotating the axles' to move the frames itl back and forth in the tracks ita to vary the distance of the vat circle walls from the cylinder as desired. Thus one side of the circle may be moved up close to the cylinder while the other side may be moved away from the cylmder.

The cylinder l'l is built up of a plurality of spaced spiders having hubs l@ secured to an axle 53 as shown. Each hub i8 has a plurality of in egral radially extending arms 2Q 'which fork into branches Bild for supporting the periphery 2l of the spider member. A foraminous wire 22 is secured over transversely extending rods (not shown) welded to the peripheries El of the spiders to form a forarninous cylindrical surface .for receiving a traveling belt 'such as the forami- 'nous wire Any type of cylinder construction that eliminates distortion and deflection may be used however.

The top part of the cylinder il is sealed from 'the atmosphere by means of a sealing cap 2G secured to the end walls of the vat. The sealing cap 25 carries a. pair of separate boxes 25 and 26 at the sides thereof. The box 25 has a foraminous top surface l'l and the suction box 26 has a foraminous top surface 28. Drain pipe lines E@ enter into the interior of the box 25 at both ends thereoi for quickly draining any water entering from the pond so that a hydrostatic pressure head is applied to the traveling belt 23 as it enters into the stock pond i6.

A vacuum pipe line Sil enters into the suction box 25 at both ends thereof for evacuating the interior of the box so that suction is applied to the belt 223 as it leaves the pond.

TSaper stock from a main supply is flowed through a pipe 3l into a manifold header 3Ia having a. plurality of branch pipes Ell), 3io, and 36d communicating with the vat lil thro-ugh the side wall i2. The stock flows upward along the wall l2 around a baille lila over a vertical'baille 32 and down under an adjustable vertical baiile 33. The bale t3 may be raised and lowered by a handwheel 3ft in screw thread relation therewith. After passing under Ithe baille 33, the stock ows upwardly through a perforated flow evener roll 35 and over an adjustable making board 36 which may be raised and lowered over the metal face l5 dening the vat circle.

Stock from an auxiliary supply may be ilowed through a pipe 30 into a header pipe 40a having branches such as lllb, 40e and 40d communicating' with the vat Ill through the side wall I I. This auxiliary stock flows around baffle Ha up along the side wall Il, over a vertical bale 4| and under an adjustable vertical baille 42. The baille 42 may be raised and lowered by means of a handwheel 43 which is in screw thread relation therewith. p

After flowing under the baille 42 the auxiliary stock is allowed to flow upward over an adjustable making board 44 into the vat pond I6. To prevent a mixing of the auxiliary stock with the main stock in the pond and to dispense with excess stock, a slotted opening ita, best shown in Figs. l.; and lll may be provided in the vat circle on th e ascending side of the cylinder allowing a small drainage of stock therethrough to drain pipes ll) in both vat end walls inside the circle. Partition walls 65d may be inserted in the inside of the circle to convey the liquids to the pipes ith. The walls iSd are spaced apart suinciently so that the space therebetween will always communicate with the pipes' i512 lrrespectively of the position of the adjustable'vat circle. '.lhel pipes o may communicate with the main or auxiliary mixing boxes 'it or 'itl hereinafter described. The opening 65a may have a slidable closure plate ibo for regulating the size of the opening.

The position of the closure plate lc as shown in Figures 1A and 1B, may be regulated to control drainage through the opening ld by any suitable regulating mechanism. For example, a pair of link arms 55e may be rigidly amxed to the back of the plate ic near the ends thereof. The arms ide are raised and lowered to slide the plate itc across the opening la by means of threaded studs i5f in screw thread relation with sockets lily in the cross member ll a of the adjustable vat circle.

The studs i5! are rotatably connected at the ends thereof to the arms ie as shown at 25h. The sockets lg may be conveniently sealed from the stock above the cross member ila by means of screw bolts Ii threaded in the top of the sockets. These bolts iti are readily removed and a key (not shown) may be inserted in the sockets Ig to rotate the studs'l 5f therein and thus raise or lower the closure plate across the openings Ida.

Obviously the closure plate l5c may be mounted behind the metal sheet itl Without departing from the principles of our arrangement. This type of mounting is sometimes to be preferred to prevent an obstruction in the stock pond i6.

The adjustable making board 44 is composed of a metal member d5 hinged to the vat circle walls l5 by means of a hinge d6. A' pliable metal or rubber strip 4l protects the hinge 46 from the stock and prevents any obstruction in the flow of the stock. The hinge 4G is also protected from the stock pond IE by a pliable member 41a secured to the vat circle.

The memberv d5 carries a slidable top piece 48 which may be readily raised and lowered along the member d5 by means of the slot and bolt arrangement lS. The top piece 4B is connected, through a link 5l, with an adjusting screw 50. This arrangement permits the spacing of the making board. 44 at variable distances from the cylinder il and also permits the regulating of the effective height of the making board.

The adjustable circle arrangement which we have provided makes possible the provision of a relatively large pond of stock on one side of the cylinder while the other side may be moved up close to the cylinder thereby giving a definite control to the formation area. The making board 44 may be moved back away from the cylinder I1 to define a considerable pond of stock` against the suction box 26 and emerging side of the cylinder. With the Vat circle moved un close a pipe line iut leading into the main mixing box 18.

The cylinder is evacuated through a pipe line 63 by a pump 63a exhausting to the atmosphere. Since only a vapor will be drawn through the pump 63a, it is not necessary to return the very small amount of condensed water to the system. A small vent 63o is provided in line 53 to break the vacuum when desired.

In this manner all of the white water from the main cylinder drains, from the drain and suction box adjacent to the sides of the sealing cap, from the suction turning roll. and from the flat suction box, is returned to the system so that the only white water that is lost is that small amount retained in the nbrous web on the forming wire 23 as it goes to the presses and drying cylinder.

A concentrated pulp stock: is made up in a main stool; beater lii'( and flowed through a valved pipe line imi into the main stoel: chest tElQ. es the stoel; is needed it is pumped from the chest M19 by a pump tilde, through a pipe line ldo into the screen llo where it is nltered and flowed into the main mixing b x ld through pipe line i id. The stock is mixed to the properl consistency in the main mixing box l@ with-white water from pipes l5, tile, and ido and allowed to ow by gravity through the feed pipe .'-it into the manifold Sia communicating with the interior of the vat through branch pipes il ib, 3 Ec and Sid thereby insuring an even distribution of stock to the vat. Any excess white Water in the mixing box 'i8 is drained into the storage tenir iii through a drain line lita-L.

in auxiliary stoel; beater i E2, may be provided Vto supply a concentrated stock pulp to the aux-- iliary stoel; chest H3 through `a valved pipe iine llS. A pump itil is provided to flow the stools from the chest liti through the pipe lita. into the screens lla. From the screens 'ila the stock flows by gravity through the pipe M55 into the auxiliary mixing box i6 where it is diluted with white water from the pipes 'I3 and 30d and owed through the pipe l@ into the manifold dilo and into the vat pond on the ascending side of the cylinder, through its branches 40h, 40o and 40d.

As shown stock in the screens 'ila and Wb may be diluted with white water through pipe "4.`

White water from the storage tank iii ls pumped by means of a pump llt into a supply line IIBa. connected through valved branch lines Ii'l and H8 to the main beater and auxiliary beaters Ill'i and H2 respectively. The white water in the storage tank IH is used to make up the concentrated stock suspension in the stock beaters.

We have found that our recrculating system operates indefinitely without the addition of any water since the loss of water in the web is more than made up by the water entering through the showers 69 and 69a. All of the water except that retained in the web, however, is kept in the system and our apparatus is therefore operable at very low cost since it entirely dispenses with the large water wastage problem universally accompanying the manufacture of paper. Because of the economic reuse of the white water, we are able to use more dilute suspensionsvof stock than were economically in use prior to our invention. The use of dilute suspensions aids ln the production of uniform formation as the fibersl are well mixed.

are provided in addition ,to the main mixing boxes and stock beaters, it is obvious that we may form a sheet having entirely distinct properties on each side. Thus the auxiliary stoel; may be colored 'to form a two colored sheet since the colored iibers deposited on the initially formed web will only color one side of the web.

The stock feeds to the vats are gravity feeds so that no unequal flow due to irregular pump action can occur.

It should be understood that our machine may be controlled to a nicety by regulating the height of the making boards and also by regulating the distance of the 'auxiliary making board to any desired amount from the ascending side o.V the cylinder.

- lin Fig. 5 there is shown a fragmentary plan. view of the box 25 showing the manner in which the foraininous cove. El' mounted over the box so that the forced drainage is not interrupted as the Wire passes thereover. The bottoni of the box 25 contacts the face 2? along a narrow edge 25o and is secured thereto. However, the holes 2id in the face 27 which are adjacent the Thus the narrow edge 25a are wider than the as the wire 23 passes over this sectiorof box the forced drainage is not interrupted f* one part of these holes communicates with drained interior of the box while the other p communicates with the drained cylinder.

forced drainage is thus continuous from the time v liqueied, feed boxes on both sides of said vat,

feed pipes communicating with the sides of said boxes, a rotatable' cylinder in said vat, a filter medium on the periphery of said cylinder, means for draining liquid from the interior of the cylinder, means for mixing said drained liquid with the suspensions to be de-liqueed, and means for flowing said diluted suspensions to said feed boxes.

2. A feeding apparatus for cle-watering machines comprising, in combination, a vat for receiving a pond of an aqueous suspension to be de-liqueed, an evacuated cylinder rotatably mounted in said-vat, a water pervious belt entrained around said cylinder, means for sealing the interior of the cylinder from the atmosphere, means for quickly draining water from the interior of the cylinder, a mixing box for receiving concentrated aqueous suspensions, a pipe connecting said drain means with said mixing box to transmit liquid thereto diluting the aqueous suspensions therein and a pipe line for feeding said diluted suspensions to said vat.

3. A paper machine comprising, in combination, a double flow stock vat. stock feed boxes on each side of said vat, a cylinder rotatable in said vat, means for draining white water from the interior of the. cylinder, a pair of stock mixing boxes, means for supplying stock to said boxes, means for diluting the stock in said mixing boxes with white water drained from the cylinder and iti aoeaiea f means i'or flowing said ydiluted stock to said feed boxes by gravity.

d. A recirculation apparatus for white water recovery, comprising, in combination with a paper machine, a'drain for white water liberated from the machine, a pump for propelling the drained white water, a pair oi stock mixing boxes above said paper machine, means for supplying concentrated aqueous suspensions of stock to said mixing boxes, a pair oi pipe lines connecting said pump with .said mixing boxes for transmitting the drained white water thereto to dilute the stock therein, and a pair of pipe lines leadingirom said mixing boxes iorieeding the diluted stock to the paper machine by gravity.

5. il lrecirculating apparatus ior recovering all oi the white water from the wet end oi a paper machine, comprising, in combination with a paper machine having a rotating cylinder, a sealing cap, drain boxes on the sealing cap, a suction roll and a stationary suction box, means for vcompletely draining White water from the cylinder,

the suction boxes and roll, a stock mixing box,l

means for supplying a concentrated stock suspension to said mixing box, means for diluting said stock with the drained white water and means for flowing said diluted stock by gravity to the paper machine.

ii. it double iiow stock vat for a paper machine, comprising avat circle, stock feed boxes on each side of said circle, adjustable baies in said feed boxes, a making board on each side of the vat circle, means for raising and lowering said making boards, and means for moving at least one of said making boards about an axis.`

7. in a cylinder vat, in combination, arieed box, a vat circle, a rotatable suction member in said vat circle, a making board on said vat circle, and means for varying the distance of said making board 'from said cylinder.

il. lin a machine of the class described having an open ended cylinder rotatably mounted in a stock vat with chime rings on its inside end Walls opposite to the ends oi the cylinder, a plurality of guide rolls around'the stock vat and a pair of endless belts trainedt'around said guide rolls and overlapping the ends of the cylinder and chime rings for sealing the cylinder from the vat.

9. lin a machine of the class described having a stock vat for receiving a pond of pulp stock, and a cylinder rotatable in said vat, means for sealing the ends of the cylinder from the pond comprising an. endless strap entrained around each end oi the cylinder and adapted to travel therewith.

10. A'seal for cylinders with open ends rotatably mounted in stock va having laterally exl tending chime rings on their inside end walls opi posite to the ends oi the cylinders comprising an endless belt entrained around the outside of the vat and each end of the cylinder and adapted to travel with the cylinder, said seal overlapping the chime ring and being adjustable to vary the effective width of the cylinder.

11. In a machine of the class described having a stock vat ior a pond oi stock, a cylinder rotatable in said vat, a sealing cap for saidcylinder, and chime rings extending laterally inward from the vstock vat walls opposite the ends of the cylinder beneath the sealing cap, a traveling belt slidable over the sealing cap on each end thereof and entrained around the chime rings and the cylinder ends extending below the sealing cap for sealing the cylinder from the pond.

l2. In a machine of the class described having a stock vat and a forming wire entraiued around a' revolving suction member in said vat. adjustable traveling seals for the ends of said suction member and traveling deckle straps on said forming wire.

13. The process of forming nbrous web material which comprises sucking nbers from their position in aqueous suspension radially onto a traveling forming wire as said wire advances through a pond of said stock, quickly draining all of the water passing through the wire to effect an uninterrupted suction thereagainst and recirculating said water for diluting the aqueous suspensions of stock supplied from the beaters.

14. The process of forming paper which' comprises forming a pond oi an aqueous suspension of stock` advancing a forming wire through'said pond entrained around a revolving member,

forcing the bers from their position in the pond radially onto the Wire, quickly draining all oi the white water from the revolving member to develop a high hydrostatic head, recirculating said water to stock mixers for diluting the stocii; supplied thereto and feeding said diluted stock to the pond by gravity. g

l5. The process of ice-using white water drained from paper .machines which comprises flowing said water to mixing boxes and screens to dilute concentrated stock suspensions therein and feeding said diluted stock as needed to the paper machine while storing any small excess oi white water for subsequent use in the stock beaters.

16. The process of making paper having unlike surface characteristics which comprises sucking stock from a pondonto a wire as the wire advances through the pond entrained around a revolving suction member and supplying a different type of stock in separately regulated amounts to the nbers already sucked on the wire as the wire emerges from the pondfor imparting a distinct surface characteristic thereto.

17. The process of forming paper with one surface having different characteristics than the other surface which comprises sucking bers of one type from their position in aqueous suspension in a pond of stock radially onto a traveling forming wire entrained around a revolving suction member immersed in the pond as saidA wire descends into the pond and sucking auxiliary fibers of another type onto the bers already on the Wire as the wire emerges from the pond.

' 18. The process of making two sided paper sheets which comprises supplying-one type of paper stock to one side of a double flow vat sucking the 'bers of said stock onto. a traveling forming wire advancing through thevat, supplying another type of stock to the opposite side of the vat and depositing i'lbers from said stock onto the nbers already on the wire asf the wire emerges from the vat.

19.\A white water recirculation apparatus for paper manufacturing comprising in combination, stock beaters, stock chests connected therewith for receiving the stock from lthe beaters, refining screens communicating with the chests for screening stock therefrom, mixing boxes in communication with the screens, a cylinder vat, white water drainstherein, means for flowing drained white water to the mixing boxes for diluting the ,stock therein and means for feeding the diluted stockto the vat.

beater, an auxiliary stock beater, aV mainland an auxiliary stoclr chest for receiving stock from the beaters, a main and an auxiliary refining screen, means for owing stock from the main chest to the main screen, means for llowing stock from the auxiliary chest to the auxiliary screen, means lfor diluting the stoci; in the screens with white water drained from the cylinder, main and auX- iliary mixing boxes, means for iowing stock from the main screen to the main mixing x, means -for ilowing stoclr from the auxiliary screen to the auxiliary mixing box, means for selectively fdowing White Water drained from the vat to said mixing boxes for diluting the stock and means for feeding the diluted stock to the feed boxes of 'the vat.

2i.. A stoel.; vat having an adjustable vat circle comprising a pair oi spaced opposed arcuate members deining the circle, tracks on the bottom of the vat, and means for moving the members along the tracks tc vary the size oi the area del lined by the circle.

- 22. A stool: vat having a bottom, sides and ends,

a plurality oi' frame members slidable on the bot tom of the vat having arcuate shaped faces for defining one half of a vat circle, a plurality of identical frame members in space opposed relation to the aforesaid frames, a gear racl; on each frame member, a pair of axles rotatably mounted in the vat end Walls, and gears on said axles engaging said racks adapted to move the frames along/the traci: as desired for varying the size of the circle area defined by the frames.

23. A feed device for paper stoel; to a vat comprising a pipe for conveying stock, a manifold header pipe in communication therewith, and branch pipes leading from the header to the interior of the vat near the bottom thereof.

2li. The process of forming paper which comprises forcing fibers trom their position in aqueous suspension onto a. traveling forming Wire by high hydrostatic pressure as said Wire advarices through the pond around a rotating cylin der While maintaining the pressure against the wire uninterrupted from the time the Wire enters the pond until it emerges therefrom.

25. An air tight seal for a foraminous cylinder comprising, in combination, a sealed suction box having a foraminous face, a sealed drain box in spaced horizontal relation therefrom having a oraminous face oppositely disposed from the drain box face and a cross member secured to said boxes for sealing the space therebetween.

26. An air tight seal for the top portion of a foraminous cylinder rotatably mounted in a vat having side and end walls comprising, in combination, a substantially vertical air tight drain` box extending across the vat and having the ends thereof sealed in the side walls of the vat, a substantially vertical air tight suction box extending across the vat in spaced horizontal relation from -the drain box and having its ends sealed in the aosaiee side walls of the vat, oppositely disposed foraminous faces on said boxes and a horizontal cap member secured to the end walls of the vat joining said boxes together.

2'?. A double oW stock vat for a paper machine comprising a vat circle defining a stock pond, making boards on each side of said circle, means to supply stock to the stoel: pond over each of said making boards, a drain opening below one o'f said making boards to prevent intermingling in the stoclr pond of stock supplied thereto, and means to adjust the size of said opening.

28. In a paper machine of the class described, a stool; vat, a vat circle therein defining a stoclr pond, feed boxes on each side of said vat circle to supply stock to said pond, a cylinder rotatable in said pond, a drain slot in. said vat circle on the ascending side of said cylinder to prevent intermingling of stock from the separate feed boxes, a closure plate slidable across said slot to vary the size of the opening,rand means to actuate said closure plate. J

29. IThe process o. forming fibrous web material which comprises sucking bers from their posi tion in aqueous suspension in a pond onto a traveling forming Wire entrained around a revolving suction member immersed in the pond as said Wire descends into the pond, sucking auxiliary fibers onto the fibers already on the wire'as said wire emerges from the pond and draining smali amounts of the aqueous suspension in the pond from a point below the region where auxiliary iibers are deposited on the wire to prevent intermingling oi the auxiliary bers with the other bers in the pond;

30. The process of making paper with one sur face having diierent characteristics from the other surface which comprises sucking fibers of one type from their position in aqueous suspension in a pond of stock. radially onto a traveling forming Wire entrained around a revolving suction member immersed in the pond as said wire descends into the pond, sucking auxiliary fibers of another type onto the bers already on the Wire as said vvire emerges from the pond, and selectively draining quantities of stock from a point in the stock pond below the auxiliary stoel: deposition region to prevent intermingling of the two types of fibers in the stock pond.

3l. The process of forming fibrous web material which comprises creating a pond of fibrous material in aqueous suspension, advancing a forming wire through said pond while entrained around a revolving suction member, depositing fibers on said wire while subjecting the wire and

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