US3821073A - Multi-layer paper formation wherein outer layers are substantially free of bod substances - Google Patents

Multi-layer paper formation wherein outer layers are substantially free of bod substances Download PDF

Info

Publication number
US3821073A
US3821073A US00294020A US29402072A US3821073A US 3821073 A US3821073 A US 3821073A US 00294020 A US00294020 A US 00294020A US 29402072 A US29402072 A US 29402072A US 3821073 A US3821073 A US 3821073A
Authority
US
United States
Prior art keywords
fibre
sheet forming
suspension
layer
additional
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00294020A
Other languages
English (en)
Inventor
E Eriksson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KARLSTAD MEKANISKA AB
KARLSTADS MEKANISKA WERKSTAD SW AB
Original Assignee
KARLSTAD MEKANISKA AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by KARLSTAD MEKANISKA AB filed Critical KARLSTAD MEKANISKA AB
Application granted granted Critical
Publication of US3821073A publication Critical patent/US3821073A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers

Definitions

  • the second fibre suspension flow is first subjected to a [22] Fil d; On, 2, 1972 washing process giowhiclg the original suspensiton I 1 water containing D su stances is exchanged or [21] Appl' 294020 new suspension water which is substantially free from BOD substances, and is after this washing process con- [30] Foreign Application Priority Data veyed to one or more additional sheet forming stages Oct. 15, 1971 Sweden 13117/71 wherein we of more additional fibre layers are formed and dewatered. These additional fibre layers 52 us. c1 162/126, 162/127, 162/190, 1 are 19 Withthe first fibre layerfrom the firstsheet 162/203 162/264 162/300, 162/303 forming stage into a multi layer fibre web, which is 511 1m.
  • the press section is preferably recirculated to the RCIEZei X n proce and used therein for the ubstitution 5 322 :32; g i' of the original suspension water containing BOD con- 3:471:36? 10]]969 162/123 X taining substances in the second fibre suspension flow.
  • the present invention relates to a process for the manufacture of paper or similar fibre sheet products without any discharge of water polluting, biochemically oxidizing substances from the production process.
  • the invention is also related to a apparatus in which the process according to the invention is used.
  • the fibre-stock suspensions used for the manufacture of paper and similar fibre sheet products by wet form ing contain generally substantial amounts of biochemically oxidizing substances, so called BOD (biochemical oxygen demand) substances, which originate from the preparation of the fibre-stock and which are contained in the suspension water which is removed from the fibre suspension at the dewatering thereof in the paper manufacturing process.
  • BOD biochemical oxygen demand
  • These BOD substances consist partly of suspended organicsubstances, as fines, bark, resin and fat, and partly of dissolved organic substances, as lignin, hydrocarbons, organic acids and alcohols.
  • the white water or backwater from the sheet forming section and the press section of a paper machine contains generally a substantial amount of such BOD substances, wherefore it has be come more and more obvious that such backwater cannot be permitted to be discharged into rivers and lakes, where it will give cause to an unacceptable water pollution.
  • One method is to take such steps at the production of the fibre-stock, i.e., at the production of the paper pulp, that the resulting pulp does not contain any BOD substances which can pollute the backwater in the subsequent paper manufacturing process. This must of course be done in such a manner that the pulp production itself does not give cause to any discharge of water containing BOD substances.
  • Such a method involves however considerable problems.
  • the solid, suspended BOD substances may certainly in principle be removed by filtration or settling but can hardly be recirculated to the pulp production process but must be destroyed or made harmless in some other way.
  • the dissolved BOD substances on the other hand cause still more difficult problems, as they cannot be removed by mechanical means.
  • the other, alternative method is to take care of the BOD substances in the-backwater from the sheet forming and press sections of the paper ma chine used in the paper manufacturing process in such a way that these substances are not released into rivers or lakes.
  • the solid suspended BOD substances may be separated from the backwater by filtration or settling and either be destroyed or recirculated to the process, in which latter case, however, the recirculated BOD substances will cause a certain discolouration or yellowing of the manufactured paper.
  • the dissolved BOD substances in the backwater on the contrary. can only be taken care of by complete closing of the backwater system so that all backwater is recirculated to the process.
  • the primary object of the present invention is therefore to provide an improved process for the manufacture of paper and similar fibre sheet products, in which it is possible to use as starting material a fibre-stock suspension containing BOD substances without any backwater containing BOD substances being discharged and without any discolouration or yellowing of the surface of the manufactured product due to the presence of BOD substances.
  • Another object of the invention is to provide a process for the manufacture of paper and similar fibre sheet products, which has a very low total water consumption and in which almost the entire amount of water necessary for the process is kept circulating in closed loops within the process.
  • An object of the invention is also to provide a plant for the manufacture of paper and similar fibre sheet products by means of a process according to the invention.
  • the process according to the invention comprises the steps of dividing an initial fibre-stock suspension, which contains BOD substances, into a first and a second fibre suspension flow;
  • a particularly preferred embodiment of the process according to the invention comprises the additional step of recirculating the backwater from said additional sheet forming stage to said washing process to be used therein as new suspension water to be substituted for the original, BOD substances containing, suspension water in said second fibre suspension flow.
  • paper or a similar fibre sheet product is manufactured in two or preferably three or still more layers, and the BOD substances originally contained in the initial fibre-stock suspension are substantially concentrated in one of these layers and particularlyin the central layer in a product containing three or more layers. ln this way any discharge of water-carried BOD substances from the manufacturing process is eliminated and at the same time the two surface layers of the product or at least one surface layer of the product, if the product consists of only two layers, will remain free from any BOD substances that may cause a dliscolouration or yellowing of the surface.
  • FIG. 1 shows by way of example a flow diagram for a production of newsprint, in which a process according to the invention is used;
  • FIG. 2 shows schematically a paper machine which may be used for the production illustrated in FIG. ll.
  • a grinding process I to which wood and water enclosed in and adhering to the wood is supplied at 2, wood is ground in conventional manner to wood-pulp, which is transferred to a screening process 3, in which more water is added at 4 and the pulp is processed in conventional manner to the fibre-stock suspension to be used for the paper production.
  • This initial fibrestock suspension from the screening stage 3 is divided in two suspension flows 5 and 6. This division of the initial fibre-stock suspension in two separate suspension flows may, when desired, also involve a quality discrimination with respect to for instance the fibre length of the stock in the two suspension flows 5 and 6. Both these fibre suspension flows 5 and 6 will contain BOD substances.
  • the suspension flow 5 is conveyed directly to a first sheet forming stage 7 for the forming and dewatering of a first fibre layer 8.
  • the entire amount of backwater from this first sheet forming stage 7 is collected and recirculated to the process; in the illustrated example of the invention to the screening process 3.
  • the second fibre suspension flow 6 is conveyed to a washing process 9, in which the fibre suspension 6, which contains BOD substances, is washed or treated with water supplied at M), which is substantially free from BOD substances, in such a manner that the original, BOD substances containing, suspension water is exchanged for new suspension water which is substantially free from BOD substances. Consequently, the washing stage 9 provides a fibre suspension flow ll which is substantially free from BOD substances.
  • the BOD substances originally contained in the fibre suspension flow 6 are discharged from the washing process 9 together with the suspension water which has been exchanged in the washing process, as a water flow 12 which is recirculated to the initial fibre-stock suspension; in the illustrated example to the screening process 3.
  • washing devices for such an exchange of the suspension water in a fibre-stock suspension are well known in the art, wherefore they do not have to be described in detail. Examples of appropriate washing devices are described and shown in US. Pat.
  • the fibre suspension flow 11 from the washing stage 9, which is free from BOD substances, is in the illustrated example of the invention divided in two suspension flows which are conveyed to a second sheet forming stage 13 and a third sheet forming stage M respectively.
  • a second fibre layer is formed and dewatered.
  • This second fibre layer from the second sheet forming stage 13 is joined with the first fibre layer 18 from the first sheet forming stage 7 to a two-layer fibre web 15, which is subsequently joined with a third fibre layer, which is formed and dewatered in the third sheet forming stage 14, so that finally a three-layer fibre web 16 is obtained.
  • the different fibre layers are joined to form the ultimate multi-layer fibre web in such a manner that the fibre layer 8 formed in the first sheet forming stage 7 will be disposed between the two fibre layers formed in the additional sheet forming stages 13 and 14.
  • the second fibre layer is preferably formed and dewatered in contiguity with the one side of the fibre layer 8 produced in the first sheet forming stage 7, whereas in the third sheet forming stage M the third fibre layer is formed and dewatered in contiguity with the opposite side of the first fibre layer 118 in the two-layer fibre web l5 transferred from the second sheet forming stage 13.
  • the different fibre layers may be formed and dewatered separately and subsequently joined to form the final multi-layer web. Whether the one or the other method is used is of secondary importance for the process according to the invention and is primarily determined by the type of paper-making machine being used.
  • the resulting multi-layer fibre web 16 is subsequently passed through a press section l7 for additional dewatering and thereafter conveyed to a dryer section (not shown in the drawing), in which the remaining water in the paper web 18 leaving the press section 117 is removed.
  • a dryer section not shown in the drawing
  • a certain amount of clean water is supplied to the press section 17 and 19 for the cleaning of the press felts.
  • the backwater from the sheet forming stages 13 and 14- and also from the press section 17 will be substantially free from any BOD substances, wherefore this backwater can be discharged into a river or lake without giving cause to any water pollution.
  • the backwater from the sheet forming stages 13 and 14 and from the press section 17 is preferably collected and recirculated at 10 to the washing process 9, in which this backwater is used as the washing water, free from BOD substances, required for the washing of the fibre suspension flow 6. In this way a completely closed backwater system and thus a very low water consumption is obtained.
  • the water consumption is limited to the amount of water conveyed to the process together with the wood supplied to the grinding stage 1 and the amount of clean water supplied at 19 to the press section 17 for the cleaning of the press felts.
  • a corresponding amount of water leaves the process together with the paper web 18 leaving the press section 17 and is consequently removed as steam at the subsequent drying of the paper web.
  • the major portion of the very large water volumes necessary for the process are kept circulating in closed loops within the process. Due to the very low water consumption of the process, a paper manufacturing plant operating in accordance with the invention does not have to be located close to any large source of water, as for instance a river or lake.
  • the BOD substances contained in the pulp leaving the grinding stage 1 will be substantially exclusively concentrated into the fibre layer 8, which is formed in the first sheet forming stage 7 and which will constitute the central layer in the manufactured paper web, whereas on the other hand the fibre layers which are formed in the sheet forming stages 13 and 14 and which constitute the external surface layers in the manufactured paper web, will be substantially completely free from any BOD substances. Consequently, the manufactured paper will have surface layers which are not discoloured or yellowed by any BOD substances in spite of the fact that practically the entire amount of BOD substances contained in the original pulp will also be contained in the manufactured paper web, namely in its central layer 8, so that no water-carried BOD substances are discharged from the process.
  • this chemical pulp is preferably added to the fibre suspension fiow 5 supplied to the first sheet forming stage 7, as indicated by a broken flow arrow 20, so that also the BOD substances in the chemical pulp will be incorporated in the central layer 8 of the final paper web. 1
  • the entire backwater volume from the first sheet forming stage 7 and from the washing process 9 is recirculated to the screening process 3.
  • this backwatervolume could also be added directly to the fibre suspension flows 5 and 6 or be recirculated to the grinding process 1 or to any other process stage used for the preparation of the initial fibre-stock suspension.
  • the three-layer fibre web is dewatered from both sides, wherefore water contained in the two surface layers of the fibre web, which are substantiailly free from any BOD substances, is removed and replaced with water originating from the central layer 8 which contains the BOD substances.
  • the paper-making machine illustrated by way of example in FIG. 2 is adapted for the manufacture of three-layer paper and comprises consequently, in ac-
  • the first sheet forming section 7 includes a first forming roll 21 and two endless screens or wires 22 and 23, which extend together, one upon the other, over a portion of the cylindrical surface of the forming roll 21 with the wire 22 closest to the forming roll 21.
  • the wire 22 extends also over a number of guide and tension rolls 24;
  • the other wire 23 extends over a number of guide and tension rolls 25 and also over a first couch roll 26 as well as over a second forming roll 27 in the second sheet forming section 13.
  • the two wires 22 and 23 form between them a nip which converges in the direction of movement of the wires and the fibre suspension from a first headbox 28 is injected into this nip.
  • a tray 29 for collecting the backwater being removed from the fibre sheet formed between the wires 22 and 23 is located radially outwards of the portion of the circumference of the first forming roll 21, over which the two wires 22 and 23 extend.
  • the first forming roll 21 in the first sheet forming section 7 has an open, that is water-penetrateable, cylindrical wall, on the inside of which a suction box 30 is arranged within the portion of the circumference of the forming roll, over which the wires 22 and 23 extend. Further, there is an additional tray 31 for collecting the backwater from the forming roll 21.
  • the fibre suspension or slurry injected from the headbox 28 into the converging nip between the two wires 22 and 23 in the first sheet forming section 7 is dewatered in that the water is forced through the two wires 22 and 23 as these run together along a portion of the cylindrical surface of the forming roll 21.
  • the second sheet forming section 13 is in principle of the same design as the first sheet forming section 7 and comprises consequently a second forming roll 27, over which the wire 23 extends as the inner wire, and a wire 33, which forms-the outer wire on the forming roll 27 and extends over guide and tension rolls 34, a second couch roll 35 and a third forming roll 36 in the third sheet forming section 14.
  • a second headbox 38 for this second sheet forming section 13 injects the fibre-stock suspension into the converging nip between the wires 33 and 23 at the second forming roll 27. From this injected fibre suspension a second fibre layer is formed and dewatered upon the fibre layer produced in the first sheet forming section 7.
  • the second forming roll 27 in the second sheet forming section 13 has a closed, impermeable surface, wheretofore the newly formed fibre layer is dewatered only through the outer wire 33.
  • the removed water is collected in a tray 39.
  • the second forming roll 2'7 it is in this way produced a fibre web in FIG. I) consisting of two layers, which web is conveyed between the two wires 23 and 33 to the second couch roll 35, which is provided with a suction zone 37, in which further water is removed from the second fibre layer produced in the secondsheet forming section 13, and where the two-layer fibre web is separated from the wire 23 so as to be transferred by the wire 33 to the third sheet forming section 14.
  • the third sheet forming section 14 is of an identical design with the second sheet forming section 13 and comprises consequently in addition to the third forming roll 36 and the wire 33, which functions as an inner wire at this forming roll, also an outer wire 40 extending over guide and tension rolls 41 and a third couch roll 42 provided with a suction zone 43, a third headbox 44 and a collecting tray 45 for the removed water.
  • the fibre suspension injected into the nip between the wires 40 and 33 from the headbox 44 forms a third fibre layer in contiguity with the fibre layer produced in the first sheet forming section 7 and this third fibre layer is dewatered through the outer wire 40.
  • the removed water is collected in the tray 45. Consequently, at the third forming roll 36 there is produced a threelayer fibre web 16 in FIG. 1), in which the fibre layer produced in the first sheet forming section 7 forms the central layer and which is conveyed between the wires 33 and 40 to the third couch roll 42, within the suction zone 43 of which more water is removed from the last produced fibre layer and where the three-layer fibre web is separated from the wire 33 so as to be conveyed by the wire 40 to the press section 17.
  • the three-layer fibre web is picked off from the wire 40 by an endless felt 47 running over a pick off roll 46 and is then additionally dewatered in the press section 17 to provide the fibre web [8 (compare FIG. I), which is conveyed to a dryer section not illustrated in the drawing.
  • the suspension flow 5 from the screening process 3 is supplied to the headbox 28 of the first sheet forming section 7, whereas the suspension flow 11 from the washing process 9 is supplied to the headboxes 38 and 44 in the second and third sheet forming sections 13 and 14 respectively.
  • the backwater from the collecting trays 29 and 31 and from the first couch roll 26 in the first sheet forming section 7 is recirculated to the screening process 3 at 4, whereas the backwater from the collecting trays 39 and 45 and from the couch rolls 35 and 42 in the second and third sheet forming sections 13 and 14 respectively as well as the backwater from the press section 17 is recirculated to the washing process 9 at 10.
  • a paper machine designed as described above has also the advantage that all dewatering means along the wires consist of rotating rolls, which cause a very small wear upon the wires. It is appreciated that a papermaking machine of this type can readily be expanded with additional sheet forming sections for the manufacture of paper webs with more than three layers. It is also appreciated that a paper-making machine of a similar design may also be used for the manufacture of paper webs with only two layers.
  • a process for the manufacture of fibre sheet prodnets, in particular paper, using an initial fibre-stock suspension containing BOD substances comprising the steps of dividing said initial fibre-stock suspension into a first and a second fibre suspension flow;
  • a process as claimed in claim 1, comprising the additional step of recirculating the water being removed from said second fibre suspension flow in said additional sheet forming stage to said washing process and therein using it for substituting the original, BOD substances containing, suspension water in said second fibre suspension flow.
  • a process as claimed in claim 1, comprising the additional steps of conveying said at least two-layer fibre web through a press section for additional dewatering of the fibre web; and recirculating the water being removed from said fibre web in said press section to said washing process and therein using it for substituting the original, BOD substances containing, suspension water in said second fibre suspension flow.
  • Apparatus for the manufacture of fibre sheet products comprising a first sheet forming section for the forming and dewatering of a first fibre layer;
  • At least one additional sheet forming section for the forming and dewatering of at least one additional fibre layer
  • Apparatus as claimed in claim 9, comprising at least two such additional sheet forming sections for the forming and dewatering of one additional fibre layer each in contiguity with opposite sides of said first fibre layer being formed and dewatered in said first sheet forming section.
  • each sheet forming section comprises a rotatable forming roll, two endless wires extending one upon the other along a portion of the circumference of the cylindrical surface of said forming roll so as to confine a nip between them at said forming roll, which nip converges in the direction of movement of said wires, and means for injecting a fibre suspension in said nip; the outermost of said two wires at the forming roll in a given sheet forming section constituting also the innermost wire at the forming roll in the next sheet forming section.

Landscapes

  • Paper (AREA)
US00294020A 1971-10-15 1972-10-02 Multi-layer paper formation wherein outer layers are substantially free of bod substances Expired - Lifetime US3821073A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE13117/71A SE362672B (enrdf_load_stackoverflow) 1971-10-15 1971-10-15

Publications (1)

Publication Number Publication Date
US3821073A true US3821073A (en) 1974-06-28

Family

ID=20296864

Family Applications (1)

Application Number Title Priority Date Filing Date
US00294020A Expired - Lifetime US3821073A (en) 1971-10-15 1972-10-02 Multi-layer paper formation wherein outer layers are substantially free of bod substances

Country Status (11)

Country Link
US (1) US3821073A (enrdf_load_stackoverflow)
JP (1) JPS5122962B2 (enrdf_load_stackoverflow)
AT (1) AT326996B (enrdf_load_stackoverflow)
CA (1) CA971789A (enrdf_load_stackoverflow)
DE (1) DE2250421A1 (enrdf_load_stackoverflow)
FR (1) FR2157459A5 (enrdf_load_stackoverflow)
GB (1) GB1376518A (enrdf_load_stackoverflow)
IT (1) IT975214B (enrdf_load_stackoverflow)
NO (1) NO140939C (enrdf_load_stackoverflow)
SE (1) SE362672B (enrdf_load_stackoverflow)
SU (1) SU722496A3 (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4012279A (en) * 1973-12-28 1977-03-15 Stig Selander Process of producing pulp, for manufacture of fiberboard, in a closed backwater system
US4221630A (en) * 1977-04-25 1980-09-09 Stig Selander Wet method of preparing fiberboard products in a substantially closed and balanced white water system
US4221634A (en) * 1979-02-21 1980-09-09 Federal Paper Board Company, Inc. Method of treating papermaking white water
USRE31507E (en) 1979-02-21 1984-01-24 Federal Paper Board Company, Inc. Method of treating papermaking white water
US4504358A (en) * 1980-06-05 1985-03-12 Kmw Aktiebolag Apparatus for handling white water in a twin-wire machine
US4525278A (en) * 1979-02-21 1985-06-25 Federal Paper Board Company, Inc. Method of treating chemical process water
WO1999009249A1 (en) * 1997-08-19 1999-02-25 Sca Research Ab A multi-ply web forming method and apparatus and a multi-ply paper or board product formed hereby
US20020088582A1 (en) * 2000-02-28 2002-07-11 Burns Barbara Jean Method for adding an adsorbable chemical additive to pulp during the pulp processing and products made by said method
US6423183B1 (en) * 1997-12-24 2002-07-23 Kimberly-Clark Worldwide, Inc. Paper products and a method for applying a dye to cellulosic fibers
US20020162243A1 (en) * 2001-03-07 2002-11-07 Runge Troy Michael Method for applying chemical additives to pulp during the pulp processing and products made by said method
US20030000666A1 (en) * 2001-06-11 2003-01-02 Anna Mansson Patterned paper and a method for manufacturing such
US20030159786A1 (en) * 2001-03-07 2003-08-28 Runge Troy Michael Method for using water insoluble chemical additives with pulp and products made by said method
CN105332311A (zh) * 2015-11-26 2016-02-17 黄蒋元 零排放造纸生产线

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE428811B (sv) * 1981-12-03 1983-07-25 Karlstad Mekaniska Ab Forfarande och anordning for framstellning av en flerskiktad pappersbana

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4012279A (en) * 1973-12-28 1977-03-15 Stig Selander Process of producing pulp, for manufacture of fiberboard, in a closed backwater system
US4221630A (en) * 1977-04-25 1980-09-09 Stig Selander Wet method of preparing fiberboard products in a substantially closed and balanced white water system
US4221634A (en) * 1979-02-21 1980-09-09 Federal Paper Board Company, Inc. Method of treating papermaking white water
USRE31507E (en) 1979-02-21 1984-01-24 Federal Paper Board Company, Inc. Method of treating papermaking white water
US4525278A (en) * 1979-02-21 1985-06-25 Federal Paper Board Company, Inc. Method of treating chemical process water
US4504358A (en) * 1980-06-05 1985-03-12 Kmw Aktiebolag Apparatus for handling white water in a twin-wire machine
CZ300897B6 (cs) * 1997-08-19 2009-09-09 Sca Packaging Sweden Ab Zpusob formování vícevrstvé struktury listu papíru nebo lepenky a zarízení k provádení tohoto zpusobu
WO1999009249A1 (en) * 1997-08-19 1999-02-25 Sca Research Ab A multi-ply web forming method and apparatus and a multi-ply paper or board product formed hereby
US6342125B1 (en) 1997-08-19 2002-01-29 Sca Research Ab Multi-ply web forming method and apparatus and a multi-ply paper or board product formed hereby
US6423183B1 (en) * 1997-12-24 2002-07-23 Kimberly-Clark Worldwide, Inc. Paper products and a method for applying a dye to cellulosic fibers
US20020088582A1 (en) * 2000-02-28 2002-07-11 Burns Barbara Jean Method for adding an adsorbable chemical additive to pulp during the pulp processing and products made by said method
US20020162243A1 (en) * 2001-03-07 2002-11-07 Runge Troy Michael Method for applying chemical additives to pulp during the pulp processing and products made by said method
US20030159786A1 (en) * 2001-03-07 2003-08-28 Runge Troy Michael Method for using water insoluble chemical additives with pulp and products made by said method
US6984290B2 (en) 2001-03-07 2006-01-10 Kimberly-Clark Worldwide, Inc. Method for applying water insoluble chemical additives with to pulp fiber
US7749356B2 (en) 2001-03-07 2010-07-06 Kimberly-Clark Worldwide, Inc. Method for using water insoluble chemical additives with pulp and products made by said method
US20100243187A1 (en) * 2001-03-07 2010-09-30 Troy Michael Runge Method for Applying Chemical Additives to Pulp During the Pulp Processing and Products Made by Said Method
US7993490B2 (en) 2001-03-07 2011-08-09 Kimberly-Clark Worldwide, Inc. Method for applying chemical additives to pulp during the pulp processing and products made by said method
US20030000666A1 (en) * 2001-06-11 2003-01-02 Anna Mansson Patterned paper and a method for manufacturing such
CN105332311A (zh) * 2015-11-26 2016-02-17 黄蒋元 零排放造纸生产线
CN105332311B (zh) * 2015-11-26 2017-12-15 黄蒋元 零排放造纸生产线

Also Published As

Publication number Publication date
FR2157459A5 (enrdf_load_stackoverflow) 1973-06-01
AT326996B (de) 1976-01-12
CA971789A (en) 1975-07-29
NO140939B (no) 1979-09-03
ATA879872A (de) 1975-03-15
IT975214B (it) 1974-07-20
NO140939C (no) 1979-12-12
DE2250421A1 (de) 1973-05-03
SU722496A3 (ru) 1980-03-15
JPS5122962B2 (enrdf_load_stackoverflow) 1976-07-14
JPS48103804A (enrdf_load_stackoverflow) 1973-12-26
GB1376518A (en) 1974-12-04
SE362672B (enrdf_load_stackoverflow) 1973-12-17

Similar Documents

Publication Publication Date Title
US3821073A (en) Multi-layer paper formation wherein outer layers are substantially free of bod substances
Bajpai Basic overview of pulp and paper manufacturing process
RU2429322C1 (ru) Бумагоделательная машина
CN1854390B (zh) 造纸织物
CN100385065C (zh) 具有成对顶层纬纱及附加中间层纬纱的多层成形织物
CA2130651C (en) Dryer section of a paper machine
US5275024A (en) Paper pulp washing
CN100385064C (zh) 包括三层垂直堆叠纬纱且具有成形面纬纱对的织物
US20020124981A1 (en) Method and machine for manufacturing a fibrous pulp web
EP0519920B1 (en) Couch press transfer apparatus and method
US20190211508A1 (en) Paper Processing Composition and Process of Production
FI104503B (fi) Menetelmä selluloosamassojen suotautuvuuden parantamiseksi
US20220186439A1 (en) Endless woven dryer fabric for papermaking machine
EP0233058B1 (en) Method and apparatus of manufacturing multilayer board
WO2012046184A1 (en) Process for the drying of pulp and a suction roll used for the drying of pulp
CA2203025C (en) Method to reduce forming fabric edge curl
SU623530A3 (ru) Способ получени двухслойного полотна волокнистого материала
SU720088A1 (ru) Сеточна часть бумагоделательной машины
US20240240404A1 (en) Unbleached natural brown copier paper and process thereof
DE3000100A1 (de) Verfahren und vorrichtung zur behandlung einer faserstoffbahn
KR100504007B1 (ko) 무방류 장망식 초지기를 이용한 제지공정
SU1258922A1 (ru) Сетка бумагоделательной машины
US253403A (en) Shiee
WO1986003795A1 (en) A process and apparatus for continuously treating pulp with a treating liquid
CA2276308A1 (en) Feeding of washing liquid in a pulp washer