US1505934A

US1505934A - Device for the continuous treatment of ligneous materials for their transformation in cellulose

Info

Publication number: US1505934A
Application number: US522616A
Authority: US
Inventors: Olier Andre
Original assignee: Olier SA Ets A
Current assignee: Olier SA Ets A
Priority date: 1921-12-01
Filing date: 1921-12-15
Publication date: 1924-08-19
Anticipated expiration: 1941-08-19

Description

Au 19 1924. Emmy;

OLIER DEVICE FOR THE CONTINUOUS TREATMENT OF LIGNEOUS MA ,TRANSFORMATION IN CELLULOSE Filed Dec. 15. 1921 4 Sheets-Sheet 1 TERIALS FOR THEIR 11 595,34 A. OLIER DEVICE FOR THE CONTINUOUS TREATMENT OF LIGNEOUS MATERIALS FOR THEIR TRANSFORMATION IN CELLULOSE Filed Dec. 15. 1921 4 Sheets-Sheet 2 Andre O/fer u 1a Mint,

Aug, 19 F 1924,

A. OLIER DEVICE FOR THE CONTINUOUS TREATMENT OF LIGNEOUS MATERIALS FOR THEIR heat 5 TRANSFORMATION IN CELLULOS E Filed Dec. 15 1921 4 Sheets-S Andre 0//er' Aug. 19 1924. 1,505,934

A. OLIER 'DEVICE FOR THE CONTINUOUS TREATMENT OF LIGNEOUS MATERIALS FOR THEIR TRANSFORMATION IN CELLULOSE Filed Dec. l5. 1921 4 Sheets-Sheet Mind " 1. The ligneous materials entering at one Patented Aug. 19, 1924.

UNITED STATES PATENT OFFICE.

ANDRE 01.11am, or cmnmomr-rnnnann, FRANCE, a ssrcnon '10 socm'ra worm mas nzmnussamanrs A. OLIER, or CLERMONT-FERRAND (PUY-DE-DOME), FRANCE.

DEVICE FOR THE CONTINUOUS TREATMENT OF LIGNEUUS MATERIALS FOR THEIR TRANSFORMATION IN CELLULOSE. 7

Application filed December 15, 1921.

To all whom it may concern."

Be it known that I, ANnnri Oman, citizen of the French Republic, residing .at Rue Amade, Clermont-Ferrand, Puy-de- Dome, France, have invented certain new and useful Improvements in Devices for the Continuous Treatment of Ligneous Materials for Their Transformation in Cellulose (for which I have filed applications in France April 9, 1921; Germany, April 22, 1921; France, patent of addition, Oct. 3, 1921), of which the following is a specification.

For transforming ligneous materials into cellulose, successive operations are actually efi'ected as follows:

The material is freed by washing or ventilation from dust and forei matters, then it is introduced in a vesse called lye-vat for subjecting it to the action of an alkali or lye, of a suitable density under pressure of steam, during a time varying with the nature of the material.

When the boiling of the material is'co-nsidered as being carried out to a suflicient degree, the apparatus is emptied on a filter for separating the lye therefrom.

The boiled material is washed several times, it is then crushed in a triturating aparatus or beating apparatus, stirred in a urge quantity of water, thickened and bleached in bleaching vats and finally, after washing, made up in sheet form on a pulppresser or on a paper machine.

This invention has for its object, the continuous manufacture of cellulose, that is to say the successive and intermittent operations by a treatment uninterrupted in its various phases and the combination of suitable mechanical means for obtaining the continuity of the operations so as to do away ,with all the intermediate manipulations be tween the admission -of the material and the delivery of the finished pulp.

For that purpose:

of the: ends of the plant automatically and continually circulate therein in order to be 'fsnbjected to the successive transformations allowing to collect paper pulp at the outlet end of. the said plant. These materials can also'be displaced, as distinct massesof de- Serial No. 522,616.

termined volume in series of sinuous conduit-pipes where they are subjected to the various actions constituting the phases-of their transformation in paper pulp; these sinuous conduit pipes are formed by vertical parallel conduits communicating together so that the masses of fibrous materials are subjected, in the course of their translation, to successive turning over movements which improve their contact with the physical or chemical agents also circulating in the said conduit-pipes.

2. On the'other hand, the cycle of the reacting products through the plant, automatically closes itself; the primary product (after the chemical decomposition which releases, in the working cycle, its constituents forming the reacting agents) is, with the exception of the losses taking place, reconstituted and subjected again to another decomposition similar to the initial decomposition. The duration of the passage of the ligneous materials in each art of the plant corresponding to a stage of the transformation is determined by arranging between each of the apparatuses constituting the same, variable and adjustable resistances controlling the rate of fiow and of circulation of the material treated.

The accompanying drawings illustrate by ture of card-board or of wrapping paper is simply to be obtained.

Figs. 6, 7, 8, are views of constructional details.

In the process the ligneous materials similar to wood are torn as usual, but the plants or knotty stalks are subjected to a rolling operation for crushing the knots. For that purpose, they are placed on a horizontal mechanical conveyor 1 which lead them between two or more. cylinders 2 and 3 superknots. Subsequently to this rolling operation, the material is brought on a chopper 4 which cuts itv in small len hs. The torn ligneous materials or the chopped plants arrive in a hopper 5 where they are taken and driven back by a fan 7 into a pneumatic agitator 10 from which they fall into a macerating apparatus 11, whilst the dust is evacuated.

The macerating apparatus is constituted by a

long vat

11 and 12, the shape of which is suited to the available space and having a semi-cylindrical bottom; throughout the length of this vat extend shafts carrying a series of heaters helically arranged so as to stir together the material falling from the pneumatic agitator and the sodalye sent into the apparatus by the centrifugal pump 29 and cause them to travel towards the outlet orifice 13. The macerating apparatus can be heated either by a double bottom or by a coil surrounding the bottom, in order to maintain a temperature favourable for the maceration.

The material and lye fall, through the orifice 13, in a continuous press constituted by two

screws

14 and 15 of reverse pitch and rotating in reverse direction in a perforated cast-iron trunk for permitting, through the branches 8, the flowing away of the lye carried along and of that arising from the squeezing of the material after the feeding of the latter, by the screws, into a conical chamber 16 closed by an automatic flap-valve 16'. The material caught by the screws is driven back against the valve 16', opens the latter and falls in the lye-vat. The agglomerate which is formed in the conical part actsas an obturator during the periods of opening of the valve 16' and prevents the'free communication between .the macer ating apparatus and the lye-,vat. p

The lye-vat is preferably a vertical apparatus 17, of cylindrical, rectangular or oval section, surrounded by a double wall or by a coil for heating at a constant temperature and of suitable height so that the material sprinkled with alkaline lye, during its passage from the top to the bottom' of 'the apparatus, is so boiled as to allow the fibres to be removed. The alkaline lye driven back by a pump in the vat 19 through. a branch 20, enters into the lye-vat throu h the piping 18; the lye, is heated by t e double bottom receiving the steam at 21 and carrying it away through 22.

- The heating of the lye-vat is effected through the branch '23 and the condensed water is carried away through 25.

The material saturated with lye, arrives in a continuous press composed of two parallel screws 33 and 34 of reverse pitch, straddling each other and rotating in reverse diall the volume'of the base of the lye-vat 17 and of the continuous ress 32 and would prevent the advance an compression of the mass under treatment. Moreover, as the said lye has already been subjected to the action of the residual lye in the macerating a paratus, the continuous flow of the lye m the lye-vat simply suflices for producing the necessary and sufiicient chemical action. The screws feed this material and push it in a compression chamber 35 permitting the lye to be squeezed out owing to the compression to which the material has been subjected upon its admission in the conical part 36 connecting the ress to the column. The agglomerate whlch is formed acts at the same time as an obturator, thus preventing free communication betwen the lye-vat and the washing column. At the end of the conical art is arranged an automatically closing ap-valve 37 which obturates it upon .material issuing through the continuous press enters the vertical or inclined washing column 38 composed of two screws having perforated coils, of reverse pitch, rotating in reverse direction, straddling each other and enclosed in' the cast-iron trunk. The material is raised by the screws, that is to say towards the upper part, whilst a stream of water produced by a jet introduced at the upper part of this column through the branches 39 will travel in reverse direction to the material and will flow away, through the perforations in the coils of the screws, to the lower part of the column through the cocks 40. There will thusbe obtained a continuous and methodical washing, employing the minimum of water whilst producing the best effect.

The material will therefore be com letely washed when issuing at the top of t e column whilst the washing water will contain themaximum of impurities at the lower end. This water will pass through the piping 41 to the pulp-collector 69"and will join the residual water of the macerating apparatus in order to allow the cellulose carried along to settle therein.

The entirely washed material passes down, through a conduit pipe 42, into a conical tical orinclined trunk enclosing two screws 53 and 54 having perforated coils and adapted to raise the material to the upper part, whilst a stream of hypochlorite of soda will be admitted through the branches 55, will travel in reversedirection to the said material and flow away through the cocks 56. This operation constitutes the continuous and methodical bleaching.

From the end of the bleaching column, the pulp containing hypochlorite of soda passes through the conduit-pipe 57 into a continuous press 58 similar to the presses 32 and 46, in which is squeezed out from the bleached material the greater portion of the hypochlorite of soda. This hypochlorite of soda issuing from the filtering cage 59 can be re-used in the bleaching column.

When issuing from the continuous press 58, the pulp still impregnated with hypochlorite falls through the conduit-pipe 62 into a washing column 63, similar to the column 38, in which the pulp and water travel in opposite directions; the 'water admitted through the branches 64 becomes loaded with hypochlorite and flows away at the upper part through the cooks 65, whilst the pulp is raised by the screws to the upper part of the column.

Being thus completely washed at the end of the washing column, the pulp descends through the pipe 66 on the continuous re? fining apparatus from which it issues through the siphon 68 and passes to the pulp-presser or to the paper machine.

The residual waters fromthe macerating apparatus 11 and from the press 13, washing column 38, bleaching column 52 and washing column 63 are collected by suitable conduit pipes in a pulp-collector 69 where the cellulose carried along separates from the liquid by means of a usual known device. The cellulose which had been carried along in the residual waters is sucked by a pump 75 which re-introduces it in the circuit of manufacture, whilst the liquid passes to the

decanting apparatus

70 or 71. The liquid is treated therein with hydrochloric acid or with chlorine gas in order to precipitate the greater part of the organic substances com bined with soda and to separate them from the liquid by continuous decantation or filtration in the apparatus 72 and 73. If decantation is adopted, the

vats

70 and 71 of the decanting apparatus operate alternately, a

vat remaining noperative whilst the other is in action. 7

When issuing from these vats, the liquid comprising nearly the whole of the chloride of sodium which has primitively served for the preparation of soda and chlorine is electrolyzed again in an electrolyzer 77, for the purpose of obtaining the soda chlorine and hypochlorite of soda necessary for the treatment of the ligneous material.

' The processunder consideration supposes therefore that an electrolytic plant is available, allowing to produce soda and chlorine by decomposition of chloride of sodium.

This recovery of the chloride of sodium in the residual waters and this generation by electrolysis of the chemical treating agents thus allows a manufacture in a closed chem-. lcal cycle, without any consumption of chemical agents other than; those'necessary for compensating. the losms.

The said closed chemical cycle is diagrammatically illustrated in Fig. 3.

The electrolyzer 77 fed with chloride of sodium by the conduit pipe 74 produces soda and chlorine.

A portion of the soda and a portion of the chlorine are sent through the respective conduit-pipes 80 and 79 of' the stirrer 82 which transforms them in hypochlorite of soda which latter bleaches the pulp in the column 52 and issues therefrom under the form of chlorinated products carrying along some fibres of cellulose, etc., which are sent to the pulp collector 69.

, The other portion of the soda is sent by the conduit-pipe 81 through the lye-vat'17, macerating

apparatus

11 and 12, press 13 and issues therefrom under the form of instable salts of soda (lignates, pectateslwhich are sent to the pul collector 69.

The otherportion of t e chlorine. is sent through the conduit-pipe 78 to the chlorination vats 70 and 71.

In the chlorination vats 70 and 71, the chlorine decomposes the instable organic salts of soda, there is formation of chloride of sodium and precipitation of organic matters; the mass thus treated passes from the

vats

70 or 71 on the filters 72 and 73 and the chloride of sodium released is sent through the conduit-pipe 74 to the electrolyzer 77.

The chemical cycle is thus closed and the chemical agents must afterwards travel through a new cycle of the continuous treatment. 7

In the present process, the foreign matters or impurities are extracted from the mass under treatment and are evacuated after each operation of bleaching, washing, chlorination, etc., and do not uselessly travel through the continuous circuit in which passes the said mass.

The treatment is continuous without dc pendence between the various operations owing to the obturating pulp plugs constituted in a continuous manner after each operation, as, after each passage in a press, the material forms an agglomerate the relative tightness of which prevents any communication between two successive columns.

The pulp collector 69 serves only to collect the cellulose fibres carried away by the lye and washing waters; these fibres settle to the bottom and form a kind of liquid pulp which, at intervals, is taken by a centrifugal pump and delivered in the circuit.

The vats 70' and 71 act both as receiving decanting and chlorination vats. Whilst one of the two vats receives the residual lyes, chlorine gas is 'at the same time admitted into the said vat; the chlorine gas in proportion as it comes in contact with the lyes decomposes the latter for forming chloride of sodium and precipitates the organic matters. The decantation or separation can be effected only when at'rest; when the first vat is full; the lye and chlorine are therefore sent in the second vat and while the latter is filling up, the first vat, at rest, permits the precipitation of the organic matters to the bottom of the vat whilst thebrine floats on the surface, clears up and can be decanted.

. Strictly speaking, it is not essential to decant, the lyes being simply filtered after treatment with chlorine.

In the modification illustrated in Fig. 4, the ligneous materials similar to wood are torn as usual, but the plants and knotty.

stalks are subjected to a rolling operation for crushing the knots. For that purpose, when the materials have been cut with a chopper, they are delivered by a fan into a pneumatic agitator 5 adapted to eliminate the dust and to direct the materials on a rolling mill constituted by two parallel horizontal cylinders 85 mechanically actuated and adapted to flatten the hollow stalks and to crush the knots. The rolling mill can be arranged in the train of the chopper so as to transmit to the fan or blower the previously crushed materials,

which would present the advantage of.

evacuating the silicious dust arising from the crushing of the knots. After this opcration, the material falls into a continuous macerating apparatus. The continuous .macerating apparatus is constituted by a conveyor and aseries of suitable trunks for ensuring a continuous circulation. The endless conveyor comprises -perforated paddles, buckets or discs 86 ('Fig. 6) secured on a chain or, preferably, on a. metallic cable 87 provided with knobs 88 forming a regular pitch for ensuring thro h suitable recessed pulleys 89 actuatfi by the ordinary and known means:

gears, worms, eta, .the di splacement of the conveyor through a series of fluid tight trunks containing the maceratin liquid. The trunks can be made of sheet-iron, cast iron or any other material; they are of rectangular, square or round shape, arranged vertically and parallel, to each'other and connected at the lower part and at the upper part by T-pipes bored in the shape'of halfcircles for allowing the rotation of the plates 86 about the axes of the pulleys 89. The lower and upper T-pipes are arranged for receiving the pulleys 89 provided with recesses and serving as a guide or driving means for the. conveyor. The pulleys 89 are cut away at 90 for allowing the rotation of the perforated discs 86.

At the lower end of each trunk is arranged a blow through cock and a branch (not shown) for the introduction of the heating steam. At the upper part is'provided an air pet-cock and a counterweight stretching device for ensuring the automatic tension of the cable in case the latter lengthens. The stretching devices are also adapted to disengage the whole in case the chains or cables should break and in case some wedging takes place. The first and last trunks are at a higher level than the intermediate trunks for permitting a continuous circulation and ensuring the circulation of the liquid notwithstanding the resistances due to the friction and to the movement of the material in the reverse direction.

The pulleys 89 being mechanically actuated, the cable 87 is put in motion through the medium of the knobs 88 and the discs 86 coming in contact with the material move the latter in the series of trunks illustrated, cause it to travel from the first to the lastone and this whilstthe macerating liquid circulates on the counter-current principle; this liquid can be introduced at the upper part of the last trunk and the material when it has arrived at the top of the last column takes the horizontal direction and falls in a .press 16 the delivery of w ich communicates with the continuous lye-vat 17. The macerating liquid carried along with the material will drip in the tubular chamber 99 shown at the upper part of the last vertical column from which it is delivered to the to of the preceding element.

The macerating liquid circulating on the counter-current principle under the action of the load, will finally flow through the branch 98 and will be directed towards the recovering apparatuses.

. The continuous lye-vat 17 is an apparatus of similar construction to the macerating apparatus, but according to the nature of the materials to be transformed, it is designed for working under pressure or at the atmospheric pressure. In the first case, the

strength of the members and the lightness are calculated for the pressures to be reached.

The operation of the lye-vat is as follows:

The materials coming from the macerating apparatus 12 are collected by the discs 86 of the continuous conveyorwithin cylindrical trunks wherein they travel without interruption up to their point of delivery, these materials, during their assage, being in contact with a suitable lye introduced by a pump or simply by gravity into the apparatus, according as the latter works under pressure or not.

In the case illustrated in Fig. 4, the lyevat 17 receives thesolution of sodaat atmospheric pressure, thus allowing'dts feedin simply by gravity, from the vat 19 through the pipe 18.

The materials issue from the lye-vat 17 and fall in a continuous press 33, 34, which distributes them through a counter-weight flap-valve 37. The lye carried along will drip in the chamber 100 and will be delivered by a pump or any other deviceat 100 in the lower part of the last element .of'the macerating apparatus. The pulp obtained must be washed in order to be transformed in a.

bleached pulp. For that purpose the material is led to a continuous washing apparatus 38 comprising, as the lye-vat and the macerating apparatus, an endless conveyor constituted by a cable provided with knobs carrying perforated sheet-iron discs circulating in a series of vertical and preferably tubular trunks. While the material circulates from the bottom to the top, a stream of water is admitted at the upper part of the column through a branch for producing, by countercurrent, a methodical and economical washing. The washing liquid, after assing throughout the height of the column, is saturated with lye and, after evacuatiom'can be mixed with the residual lyes of maceration. The washed materials enters in a continuous press 46, similar to the previous ones, which extracts a portion of the washing waters and sends, after compression, this material in the continuous bleaching apparatus. The bleaching apparatus 52 is similar in construction to the macerating apparatus. It comprises an endless conveyor constituted by a cable provided with knobs and discs which force the material to travel in the trunks in which is caused to circulate on the counter-current principle a bleaching liquid: either chloride of lime, or hypochlorite of soda.

The material issues from these trunks and falls in a continuous press 58 which squeezes out the greater portion of the bleaching liquid remain-ing in the said material. The liquid extracted can be recovered if the bleach- After this squeezing operation, the material is admitted in a last continuous washing apparatus 52, similar to the precedingone, in which it enters by travelllng in the trunks in contact with the stream of water which circulates in reverse direction. The

washed pulp falls in a vertical column which brings it in a conical refining apparatus 67 ivhich effects the final division of the celluose.

Upon leaving the refining apparatus, the pulp descends in a sand box, then passes in a purifier and falls therefrom in a vat (not shown) and finally it is brought to the pulp I presser or paper machine.

In case it is simply desired to obtain an unbleached pulp for the manufacture of cardboard or of wrapping paper, the described plant no longer comprises the bleaching and washing apparatus 52 and 62 above mentioned. It is also possible, in this case, considering the duration of the contact which can be realized between the ligneous materlals and the reaction agents, to simply use water, at a suitable temperature, for produc- I ing the maceration and lixiviation of the materials to be treated.

In this case, the plant can receive the following modifications (Fig. 5)

When issuing from the macerating apparatus 12, which is constructed and operates in the same conditions in both cases, the materials fall in a conduit the wall of which is perforated at the upper part and in communication with a chamber 92 receiving the squeezed liquids at the end of the manufacture. This chamber which feeds the liquid to the conduit 91 and to the lye-vat determines therefore the formation of an hydraulic joint above the columns of materials which must enter in the continuous lye-vat under pressure.

For eifecting the passage of the materials from the conduit 91 (which is in communication with the atmosphere) into the continuous lye-vat under pressure 17, use is made of a rotary distributor (Fig. 8). This distributor is constituted by a number of paddles 93 (six for instance) radiating about a central hub carried by the driving shaft 94. These paddles 93 are provided on their edges with sliding bars 95 subjected to the action of springs 96 which tend to maintain them in contact with the cylindrical wall of the casing 97 about the axis of which the whole of this rotary system moves angularly. The buckets formed between the paddles 93 are successively presented in front of the conduit 91, receive a load ofmaterials which they carry along and finally discharge in the continuous lye-vat without sudden drops of pressure being capable of taking place. Leakage is prevented in the column of material contained in the feeding conduit 91. Branches can be provided on the casing 97 of the rotary distributor for evacuating the pressure of the rotating buckets and using it for the reheating of the macerating aparranged at the bottom of the connecting T-pipes. In this manner, the obliquely directed steam jets drive before them the a .materials which tend to collect at the lowest part of the T- ipes.

The materia s, when issuing from the lyevat 17, are extracted by means similar to those which have caused their admission on the trunks. For that purpose, use may also be made of a rotary distributor 99. surmounting a conduit 100 the upper part of which is surrounded by a cooling device 101.

The materials are led to a continuous press 102, the bottom of which is erforated for allowin tocollect the squeezed out lye which is raise by the pump 103 to the inlet of the lye-vat*17, or delivered in the macerating a pat'btus 12. Through a counter weight flap-valve 104 which obturates the outlet of the press 102 and simultaneously produces a compression which dries the material and determines a previous fibre-removing action, the pulp falls in a continuous fibre-removing apparatus 105. The removal of the fibres is completed by the passage in a conical refining apparatus which finally gives a pulp which may be directly conducted to the pulppresser, the paper machine or the cardboard machine for obtaining wrapping paper or cardboard.

What I claim as m invention and desire to secure by Letters atent is:

1. In a plant for the transformation of cellulose materials into paper pulp, a macerating apparatus in which the cellulose materials, previousl torn, are subjected to a continuous trans ation in contact with the current of macerating liquid, a continuous press constituted by a worm rotating in a casing and communicating with the said macerating apparatus, a movable valve subjected to the antagonistic action of an antagonistic force, and opening under the thrust of the material for periodically puttin the macerating apparatus in relation wit the lye-washer.

2. In a plant for the transformation of cellulose materials into paper pulp, a macerating apparatus in which the cellulose materials, previousl torn, are subjected to a continuous trans ation in contact with the current of macerating liquid, a continuous press constituted by a worm rotating in a casing and communicating with the said macerating apparatus, a movable valve subjected to the antagonistic action of an antagonistic force, and opening under the thrust of the material for periodically puttin wit the lye-washer, a lye-washer in which the materials are displaced in contact with the soda. lye, a continuous press communieating with the said lye-washer, an automatic valve subjected to the action of an antagonistic force and opening under the thrust of the materials for periodicall putting the lye-washer in relation wit the washing apparatus.

3. In a plant for the transformation of cellulose materials into paper pulp, a maceratin apparatus in which the cellulose materia s, previously torn are subjected to a continuous translation in contact with the current of macerating liquid, a continuous press constituted by a worm rotating in a casing and communicating with the said ,macerating apparatus, a movable valve subjected to the antagonistic action of an antagonistic force, and opening under the thrust of the material for periodically putting the macerating apparatus in relation with the lye-washer, a lye-washer in which the materials are displaced, in contact with the soda lye, a continuous press communicating with the said lye-washer, an automatic valve subjected to the action of an antagonistic force and openin under the thrust of the materials for rio icall putting the lye-washer in re ation wit washing apparatus, a washing apparatus in which the materials are displaced in contact with the washing water, a continuous press communicating with the washing apparatus the macerating apparatus in relation the for squeezing out the cellulose materials, an

automatic valve subjected to the action of an antagonistic force and opening under the thrust of the materials for periodically putting the lye-washer in relation with a fibre-removing machine for allowing to ob-' tain an unbleached paper pulp.

4. In a plant for the transformation of cellulose materials into paper pulp, a macerating apparatus in which the cellulose materials, previously torn, are subjected to a continuous translation in contact with the current ofmacerating liquid, a continuous press constituted by a worm rotating in a casing and communicating with the said macerating apparatus, a movable valve subjected to the antagonistic action of an antagonistic force, and opening under the thrust of the material for periodically putting the macerating apparatus in relation with the lye-washer, a lye-washer in which the materials are displaced in contact with the soda lye, a continuous press communicating with the said lye-washer,

an automatic valve subjected to the action of an antagonistic force and opening under the thrust of the materials for period cally putting the lye-washer in relation with the washing apparatus, a washing a paratus in which the materials are displace in contact with the washing water, a continuous press communicating with the washing apparatus for squeezing out the cellulose-materials, an automatic valve subjected to the action of an antagonistic force and opening under the press communicating with the bleaching apparatus for extracting the hypochlorite of soda contained in the cellulose materials,

an automatic valve connecting the said press.

with a washing a paratus.

5. In a plant or the transformation of cellulose materials into aper pulp, a macerating apparatus in whic the cellulose materials, previously torn, are subjected to a continuous translation in contact with the current of macerating liquid, a continuous press constituted by a worm rotating in a casing and communicating with the said maoerating apparatus, a movable valve subjected to the antagonistic action of an antagonistic force, and opening under the thrust of the material for periodically puttin the macerating apparatus in relation wit the lye-washer, a lye-washer in which the materials are displaced in contact with the soda lye, a continuous ress communicatin with the said lye-was er, an automatic vs. vs subjected to the action ofan antagonistic force and opening under the thrust of the materials for periodically putting the lye-washer in relation with the washin apparatus, a washing apparatus in whic the materials are displaced in contact with the washing water, a continuous press communicating with the Washing apparatus for squeezing out the cellulose materials, an fillilOIIlfiiLlO valve subjected to the action of an antagonistic force and openin under the thrust of the materials for perio ically putting the lye-washer in relation with a fibreremoving machine for allowing to obtain an unbleached paper pulp, a bleachin apparatus in which the materials are disp ace in a continuous manner in contact with hypochlorite of soda, a continuous press communicating with the bleaching apparatus for extracting the h pochlorite of soda contained in the cel ulose materials, an automatic valve connecting the said press with a washing apparatus, a washing apparatus in which the bleached materials are displaced in a continuous manner in contact with the washing water, a continuous refining apparatus communicating with the washing apparatus for allowing to obtain a white paper pulp.

6. In a plant according to claim 4, including in combination, an electrolyzer for decom osing sodium chloride and releasing the so ium and the chlorine, means for forming a lye current and for determinin a current of lye in the lye washer, an acurrent of chlorine in the bleaching apparatus.

7 In a plant according to claim 5, means for collecting exhausted waters and solutions from the various parts of the plant and into chlorination vats, means for conducting the chlorine coming from the electrolyzer into chlorination vats for reconstituting sodium chloride and means for leading back the regenerated sodium chloride into the electrolyzer.

In testimony whereof I have afiixed my signature. I

ANDRE OLIER.