CN1703552A - Method, paper machine and base paper for the manufacture of LWC printing paper coated once - Google Patents

Method, paper machine and base paper for the manufacture of LWC printing paper coated once Download PDF

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Publication number
CN1703552A
CN1703552A CN02812227.5A CN02812227A CN1703552A CN 1703552 A CN1703552 A CN 1703552A CN 02812227 A CN02812227 A CN 02812227A CN 1703552 A CN1703552 A CN 1703552A
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China
Prior art keywords
paper web
nip
paper
rolling
hot
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CN02812227.5A
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CN100343447C (en
Inventor
汉努·科尔霍宁
约翰·格伦
亚历山大·托多罗维奇
海基·利马泰宁
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MAETSOU PAPER INDUSTRY Oy
Valmet Technologies Oy
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MAETSOU PAPER INDUSTRY Oy
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof
    • D21F3/045—Arrangements thereof including at least one extended press nip
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/006—Calenders; Smoothing apparatus with extended nips
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod
    • D21H25/14—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod the body being a casting drum, a heated roll or a calender

Abstract

A method, a paper machine and a base paper for the manufacture ofLWC printing paper which is coated once. The paper machine comprises a headbox (100), a gap former (200), a press section (300) which comprises at least one extended nip press, a pre-dryer section (400) in which a web (W) is dried applying at least cylinder drying (R1-R7), a pre-calender (500) in which the web (W) is pre-calendered, at least one portion which is formed of a coating station (600) and an after-dryer section (700) and in which the web (W) is coated on both sides applying a film coating method or a non-contact coating method and dried applying at least contact-free drying (710), an end calender (800) in which the web (W) is calendered, and a reel-up (900) in which the web (W) is reeled. The pre-calender (500) is a calender which is provided with at least one nip (NEl, NE2) and in which both surfaces of the web are in contact with a calendering backup surface having a surface temperature of at least 200 DEG C, advantageously at least 250 DEG C, the total length of the nip or nips of the pre-calender is in a range of 15-600 mm, advantageously in a range of 30-600 mm, the linear load of each nip is in a range of 50-500 kN/m, advantageously in a range of 100-400 kN/m, and the moisture content of the web before the first nip of the pre-calender (500) is in a range of 5-20 %, advantageously in a range of 6-15 %.

Description

Produce method, paper machine and the body paper of the LWC printing paper that is coated with a time
Technical field
The present invention relates to the method that a kind of manufacturing as described in the preamble as claimed in claim 1 is coated with one time LWC printing paper.
The invention still further relates to a kind of paper machine that is coated with one time LWC printing paper as the manufacturing as described in the preamble of claim 22.
In addition, the invention still further relates to a kind of body paper as described in the preamble as claim 43.
Background technology
Finnish patent application FI991096 discloses a kind of method and production line of paper machine that is particularly useful for producing fine paper.Fine paper is meant fine paper uncoated or coating.Uncoated fine paper quantitatively usually at 40-230g/m 2Scope in, and the coating fine paper quantitatively at 60-250g/m 2Scope in.The ratio of mechanical pulp generally is lower than 10% in the fine paper, and the addition of filler in slurry is about 15-30%.The fiber that reclaims also can be used in the paper pulp.Production line of paper machine comprises that short circulation, head box, Aladdin former, the press section that comprises at least one extension nip, at least a portion of slurry volume minimum wherein are drying section, precalender, two-sided pre-coating machine and the drying sections based on impingement drying, is online coating station afterwards and is arranged in online calender and the crimping machine that mainly can regulate separately based on the linear load of the back drying section of noncontact drying, each nip after the online coating station.Precalender can be hard nip calender, soft press-polishing machine or extension nip calender.Linear load in the precalender is relatively low, for example is lower than 80kN/m.Pre-coating can be finished by the film transfer coating apparatus of commercially available SymSizer or OptiSizer board.The function of pre-coating is with a kind of suitable manner the hole in the body paper surface texture to be diminished, thereby makes actual face coat keep absorbing in the paper structure from the teeth outwards and not.In when coating, can use suitable coating station, for example knife type coater, injecting type coating apparatus, the coating apparatus of preferably commercially available OptiCoat Jet board.Paper machine discussed herein is the paper machine that coating makes two bites at a cherry.
Finnish patent FI104100 discloses a kind of integrated paper machine.Traffic direction along paper web is counted, and this paper machine comprises the multilayer head box, has the Aladdin former of one prepressing at least, the press section that the nip press that extends is at least together arranged, paper web be by the predrying portion of big capacity drying unit drying, the drying section that comprises the drying group that at least one adopts single net traction and the surface processing equipment of paper web.Described paper machine all adopts closed pick up at least to the end of drying section.Surface processing equipment can be formed by precalender, and it is between drying cylinder and roller.
Finnish patent application FI981331 discloses a kind of method and a kind of paper machine of making paper.This method and this paper machine are suitable for making the used waxy luster porous paper of colored printing most.This paper machine comprises head box, wet end, press section, drying section, coating section, back drying section, calender and crimping machine.Head box and wet end can make in design paper along Z to layering, calender is to keep or is the porous press polish equipment that remains essentially in the paper web that just exists before the press polish at least.
In present patent application, the LWC printing paper (light weight coated paper) that is coated with a time is that specified amount is at 35-70g/m 2In the scope and coating quantitatively at 2-12g/m 2Printing paper in the/face scope.Every coating of body paper one time.Be used for producing the device of this printing paper in prior art, before the coating, body paper will carry out light pre-press polish after drying section.In the prior art, pre-press polish by heat roller temperature between 60-100 ℃ and the single nip calender of linear load between 10-80kN/m carry out.Too many for bulk was descended in the precompressed light time, device of the prior art is carrying out the lower linear load of precompressed light time employing.This pre-press polish of the prior art provide the PPS-s10 smoothness between 4-5.7 μ m, the Cobb-Unger oil absorbency is at 13-26g/m 2Between and bulk at 1.7-1.9cm 3The body paper of/g.
Utilize this body paper of the prior art can also produce the dab offset printing paper that LWCO printing paper (light weight coated offset paper)-promptly obtains with film coated method or noncontact rubbing method.On the other hand, utilize this body paper of the prior art can not produce the dab rotogravure paper of LWCR printing paper (light weight coating rotogravure paper)-promptly obtain with film coated method or noncontact rubbing method.This is because film coated method and noncontact rubbing method once not covering body paper uneven surfaces structure in the coating, still can be seen body paper uneven surfaces structure in the surface texture of coated paper.Therefore, must produce with the scraper rubbing method, when coating, just can cover body paper uneven surfaces structure like this, and the finished product coated paper can reach the required surface nature of LWCR printing paper with the LWCR printing paper that body paper of the prior art is produced.Conversely, scraper rubbing method body paper will contain the chemical pulp of 40-50% at least, and almost any recycled fiber can not be arranged in the body paper.Above-mentioned chemical pulp amount guarantees that body paper has required intensity in the scraper coating.The scraper rubbing method is restricted to about 1800m/min with the speed of the paper machine of online coating.
Through rough estimate, the efficient of film coated method is than scraper rubbing method high approximately 5%, and the film coated method to the speed of the paper machine of online coating without limits, therefore when producing the LWCR printing paper, also wishes to replace the scraper rubbing method with film coated method or noncontact rubbing method.In order to produce the LWCR printing paper with film coated method or noncontact rubbing method, the PPS-s10 roughness of body paper should be lower than 3.5 μ m, and its Cobb-Unger oil factor should be lower than 15g/m 2Conversely, the reduction of roughness and oil factor needs higher precompressed optical efficiency, the result, and the tightness of body paper increases, and bulk descends.Because think that always the decline of body paper bulk also can cause being coated with the bulk equivalent decline of finished product, therefore In the view of those of ordinary skills, it is impossible producing the LWCR printing paper with film coated method or noncontact rubbing method always.
Yet be surprisingly found out that in the present invention the bulk decline in the strong pre-press polish not necessarily can cause the corresponding decline of product bulk.Adopt method of the present invention just can produce the LWC printing paper of coating one time, and its bulk the bulk with the LWC printing paper of employing prior art production is suitable at least.
Summary of the invention
The principal character of method characteristic as claimed in claim 1 is described as described in the present invention.
Next, as described in the present invention the principal character of paper machine as described in the characteristic of claim 22.
Next, as described in the present invention the principal character of body paper as described in the characteristic of claim 43.
Device adopts film coated method or noncontact rubbing method and strong pre-press polish as described in the present invention.Strong as described in the present invention pre-press polish provides a kind of body paper, can enough film coated methods or noncontact rubbing method production LWCR printing paper with this body paper.
Strong as described in the present invention pre-press polish is based on known gradient press polish principle, and wherein the tightness of paper surface increases, and the intermediate portion is still comparatively loose.Contact with hot area supported when squeezing when the suitable paper web of humidity is placed in the precompressed optical pressure district, the surface temperature of paper web can rise to the glass transition temperature that is higher than fiber, and the glass transition temperature of fiber depends on the humidity of fiber.The present invention can make paper surface be in the state of fiber generation permanent plastic deformation wherein.Like this after pre-press polish the processing stage, the humidity increase of paper surface, and the fiber of paper surface can not got back to initial circle and initial position.And its original-shape is promptly got back in relaxing of fiber, can cause the unwelcome roughening again of paper surface.
By the fuel factor of precompressed photo-thermal roller, the paper surface of being close to hot-rolling becomes tight.Pre-press polish has also improved the smoothness of paper surface, and makes loose fiber or other paste composition be attached to paper surface.It is poor that pre-press polish also can be corrected the two sides relevant with oil absorbency with the smoothness of paper web.In precalender, can realize this point by the humidity of adjusting paper web and/or the temperature of hot-rolling with two nips.In each precompressed optical pressure district, the piezooptical effect of being close on the paper surface of hot-rolling is the strongest.In the first precompressed optical pressure district, a surface of paper web can be attached on the hot-rolling; In the second precompressed optical pressure district, the another side of paper web can be attached on the hot-rolling.Because paper web is dry in the first precompressed optical pressure district, therefore when heat roller temperature was identical, the piezooptical effect in the second precompressed optical pressure district was less than the piezooptical effect in the first precompressed optical pressure district.Paper web between wetting two nips can improve the piezooptical effect in the second precompressed optical pressure district.In the second precompressed optical pressure district, adopt and also can improve the piezooptical effect in the second precompressed optical pressure district than higher temperature in the first precompressed optical pressure district.Certainly, the size of the used linear load in each precompressed optical pressure district is also influential to the press polish efficient of described nip.
Though in strong pre-press polish as described in the present invention, the bulk of body paper slightly descends, surprisingly, the bulk of finished product keeps and the identical level of bulk with the LWCR printing paper of scraper rubbing method production of the prior art at least.
An explanation to this phenomenon is, because strong pre-press polish is arranged, so the end press polish can be lighter.Like this, compare with device of the prior art, what bulk descended during the press polish of end is less.
Another explanation to this phenomenon is might be to find in the used paper pulp of papermaking.Installing used film coated method or noncontact rubbing method as described in the present invention might be reduced to the ratio of chemical pulp below 30%.It is identical with the intensity of the used body paper of scraper rubbing method that the intensity of the body paper that film coated method and noncontact rubbing method are used does not need, so the ratio of mechanical pulp can bring up to 70% at least.In addition, can also use recycled fiber in the paper pulp, in this case, the aforementioned proportion of chemical pulp comprises the chemical pulp fiber that recycled fiber is contained, and the aforementioned proportion of mechanical pulp also comprises the mechanical pulp fiber that recycled fiber is contained.During press polish, after compression took place, the ability that the mechanical pulp fiber recovers its original shapes will be far longer than the chemical pulp fiber, so the mechanical pulp of larger proportion helps to keep the bulk of paper web mid portion, although the tightness of paper surface increases.
The ratio that strengthens mechanical pulp has also improved the evenness of paper web, and promptly the quantitative fuctuation within a narrow range of body paper descends.Compare with chemical pulp, the contained fiber of mechanical pulp is shorter, so it is also less at the wadding polymers that forming section forms, and paper web is more even like this.This also causes the porosity of paper surface layer in forming section to descend, and paper surface becomes tight as a result.
When the ratio of mechanical pulp increased, the light scattering coefficient of body paper also had raising, and this is because the light scattering coefficient of mechanical pulp is 60, and the light scattering coefficient of chemical pulp is 25.As a result, improved the opacity of finished paper.
Because chemical pulp is generally expensive than mechanical pulp, so cost has also been saved in the decline of chemical pulp ratio.Compare with traditional paper pulp that the LWCR printing paper is used, use recycled fiber also to make paper pulp more cheap.
In predrying before precalender, the humidity in the time of can making paper web enter precalender is higher than normal humidity.These need make paper web get final product in that the degree of drying of predrying portion is a little bit smaller, and this energy requirement that just means predrying portion reduces.Pre-press polish has also reduced the needs to the end press polish.Finish the end press polish and only need less nip of number or lower linear load.When the two sides difference of the PPS roughness of the paper web that may occur and Cobb-Unger oil absorbency had been corrected in pre-press polish, the end press polish was simplified.
Use as described in the present invention method not only can produce the LWCO printing paper but also can produce the LWCR printing paper.But the advantage of producing the LWCR printing paper is the most obvious, and this is because scraper rubbing method of the prior art can be replaced by efficient higher and more cheap film coated method or noncontact rubbing method.
Be suitable for each part of paper machine as described in the present invention with reference to known with patent documentation or the disclosed device explanation of other publication below.Do with reference to the time, described publication is merged in the application.
Short circulation technology device can be finished by the WO99/64668 disclosed method, and its trade mark is OptiFeed on market TMPulp components is mixing in the mixer of a sealing immediately through after joining stock tank, and then, slurry is transported to head box in the volume of a sealing.The volume of short circulation is minimized and adopt control automatically in a large number, can make the required time of graded (grade change) by shortening to tens seconds kinds in one hour.The present invention also can use based on the tradition of joining stock tank, machine chest and wite pit and advance sizing device.
Filler, fiber fines and auxiliary agent can join in the slurry before head box or in head box.Here also can use the head box of short circulation and/or permission auxiliary agent and/or filler and/or fiber fines layering.A kind of such sizing device that advances is disclosed in the European patent EP 651092.
Head box can use the single or multiple lift head box.Is a kind of multilayer head box disclosed in paper " Multilayering, the Methodor Madness of PCT patent application PCT/FI97/00713 and M.Odell? " in (XI Valmet Paper Technology days 1998).Can the slurry layering be entered between two nets with the multilayer head box, thereby provide required layer structure for paper web.The single or multiple lift head box can be commercially available OptiFlo TMThe board dilution headbox.In this head box, can regulate profile basis weight by concentration adjustment, can also influence fiber alignment by regulating full width character.Dilution headbox allows paper web in machine direction with transversely all obtain uniform full width character.
According to viewpoint of the present invention, forming section is preferably based on Aladdin former (for example roll-type Aladdin former, cutter boots Duoformer Duo or roller cutter boots Duoformer Duo).Aladdin former is preferably with the load dewatering elements.In Aladdin former, the online slurry stream that is produced by head box is transported between two nets, and a large amount of water is removed between described two nets along both direction, thereby obtains the paper web of symmetry.U.S. Pat 5798024 discloses a kind of favourable roller cutter boots Duoformer Duo, and what the present invention used is exactly this Aladdin former.The paper of L.Verkasalo " Efficient Forming at High Speeds " (XI Valmet PaperTechnology days 1998) has been described a kind of favourable Aladdin former, and its trade mark is OptiFormer on market TMFiber on the web thickness direction and filler distribution to a certain extent can be by the layout and the vacuum degree control of the dewatering elements of Aladdin former.In the water smoking, filler usually is accumulated in the surface of paper web.Compare with the former of other type, Aladdin former allows higher speed, and provides good evenness for the paper web that is being shaped.Be contained in forming rolls after a while the dehydration cutter of side reduced to add the bed thickness of paper web before the cutter.Conversely, this evenness to the paper web that is being shaped has positive influences.The evenness of paper web is preferably lower than 3.0g/m 2Can load described dehydration cutter with big relatively power, because when producing coated paper, the inherent bond strength of the paper web that is being shaped is not too important.In this Aladdin former, the surface of paper web can be airtight, has therefore reduced the smears that is penetrated in the paper web.The evenness that Aladdin former can obtain, airtight surface, good symmetry, uniform full width character and enough smoothnesss, this has created good chance for the further processing of paper web.
For can be with the high-speed cruising usually above 1800m/min, press section must have the enclosed supporting paper injection that passes whole press section.The solid content of paper web will be brought up to more than 45% in the press section, and this itself is possible in the press section with roll-type nip and extension nip.Between press section and drying section,, need high solid content for the tensile stress that can make paper web minimizes.The speed difference of paper web is preferably lower than 2% between press section and the drying section, because when the difference of tractive force was big, the porosity of paper web increased.The press section that use has an one or multi-channel pair of blanket extension nip press has obtained good bulk, high solid content and the paper web of symmetry as far as possible.WO99/60202 discloses a kind of independently press section of two blanket extension nip press of twice that has in one embodiment.A kind of trade mark of commercially available press section is OptiPress TM, its embodiment comprises the independently two blanket extension nips of twice.This press section provides the paper web of symmetry dehydration and surface nature symmetry.Article one, woollen blanket also can replace with the conveyer belt that need not accept water and can transmit paper web well.The absorbent properties of the smoothness of paper web and two sides difference and paper web can be by conveyer belt and press felt control.
In predrying portion, can use drying cylinder and/or blowing dry, for example impingement drying and/or impingement drying.The upstream extremity of predrying portion is even more important, and its purpose is to make the speed difference of the paper web between press section and the predrying portion to keep low as far as possible.The blowing drying section that is positioned at predrying initiating terminal has been realized highly effective drying, and speed difference is minimized.The blowing drying has also been quickened graded, and this is because the adjustment of blowing drying unit is very fast.Next predrying can be cylinder dried portion from using the dry plane drying section of blowing.In cylinder group, also can use the major diameter vacuum drying cylinder that is placed in the bottom space, the impingement drying unit is attached thereto, and is used for dry paper web in the operation of vacuum drying cylinder outer surface.Compare with traditional cylinder dried, impingement drying also can be with higher control from view of profit full width humidity.PCT patent application PCT/FI98/00945 discloses a kind of drying section that adopts impingement drying, and its trade mark is OptiDry TMThe predrying portion that has steam drying equipment or humidification apparatus also can be provided, and curling of paper web can be controlled and regulate to known these equipment.
After predrying, paper web is transported to precalender, and precalender can be formed by soft press-polishing machine or extension nip calender.Extension nip calender can be boots formula calender or belt calender.In boots formula calender, the extension nip is formed between shoe roll and the stiff dough hot-rolling.Shoe roll comprises that stationary support and rotation are placed in stationary support elastic webbing shell on every side.The band shell is loaded and near hot-rolling, load shoe is bearing on the supporting structure of shoe roll by load shoe, and form the extension nip with hot-rolling.Belt calender can be formed by hot-rolling, band and backing roll, and backing roll can be stiff dough roller or soft roller.Described band is in backing roll and guide roller/idler roller surface operation.In this belt calender, the extension nip is formed between band and the hot-rolling, about this point, for example can use metal tape.U.S. Pat 5483873 discloses a kind of such belt calender.If two press polish area supporteds can be heated, precalender also can be used single nip calender so.Finnish patent application FI971342 discloses a kind of purposes of belt calender, wherein moves in the nip of paper web between two elastic surface rollers, and the elastic surface roller is between the metal tape of described roller operation.If two strip metal bands all are heated, so just adopt single nip calender, wherein two of paper web surfaces can be subjected to the processing of the press polish area supported of heat.Yet, advantageously two nips of precalender or multiple pressure district calender, wherein two of paper web surfaces can be subjected to the processing of hot-rolling.A kind of favourable calender that is suitable for doing precalender is commercially available OptiSoft TMThe board soft press-polishing machine, wherein nip is formed on and has between tectal roller of elasticity and the stiff dough hot-rolling.A kind of OptiSoft TMThe purposes of calender is disclosed among the Finnish patent application FI992214.The favourable calender that another kind is suitable for doing precalender is commercially available OptiDwell TMBoard boots formula calender, its purposes is disclosed in the U.S. Pat 6158333.
Be the paper web coating after the pre-press polish,, make the surface texture of body paper become smooth by coating.Coating can be used film coated method or noncontact rubbing method.Wherein the noncontact rubbing method comprises spraying process, curtain formula rubbing method and dry method coating.Finnish patent FI97247 discloses a kind of commercially available OptiSpray TMThe board spraying process.Finnish patent application FI991863 discloses a kind of curtain formula rubbing method.The common ground of these rubbing methods is that coating layer thickness is substantially the same.Coating is consistent with the full width surface nature of body paper.The result is that uneven paper surface can obtain uneven coating surface.Coating is preferably in the small-sized coating station to be carried out, and wherein two of paper web surfaces can be coated with simultaneously.The film coated method is very suitable for this coating method.Airtight and the smooth paper surface that obtains through pre-press polish can provide coating required good condition.Here, preferably use the full width coating apparatus, on the basis of surface measurement, can control automatically this equipment.This guarantees that coated paper web has good croos profile character, guarantees that also coated paper has uniform quality.As a kind of coating apparatus, can use commercially available OptiSizer TMBoard two-side film membrane coating apparatus, two surfaces wherein can handling paper web with starch or pigment suspension simultaneously.If desired, can carry out very dab cloth with this coating apparatus, about this point, coating quantitatively is at least about 2g/m 2/ page or leaf.A kind of coating apparatus of this type is disclosed in the Finnish patent 81734.
Be the back drying section after the coating station, back drying section is from adopting the drying section of contactless drying.Be short cylinder group after the contactless drying, can stablize the operation of paper web by it, because drying is continuous, so originally the tractive force of paper web and tension force be affected simultaneously.Cylinder group adopts single net draw ratio more favourable.About contactless drying, can adopt commercially available TurnDry TMThe board drying equipment, wherein paper web dry and supporting in contactless mode, and overturn by same equipment, for example tipping arrangement and air-flow paper web dryers are used in combination.This has guaranteed graded fast, has also guaranteed the stable operation of paper web simultaneously.A kind of such drying means is disclosed among the Finnish patent FI98944.
Be in the thread end press polish afterwards, its purpose mainly is in order to improve the gloss of coated paper web, because the required smoothness of paper web is realized in precalender.The two sides difference relevant with the roughness of paper web also obtained correcting on precalender, therefore there is no need to do in the calender of end such correction.The result is that the end press polish can be lighter.The end press polish can be carried out by soft press-polishing machine or multiple pressure district calender.Soft press-polishing machine can use commercially available OptiSoft TMThe board calender, it has one to be formed on the nip that has between tectal roller of elasticity and the stiff dough hot-rolling.A kind of OptiSoft TMThe purposes of board calender is disclosed among the Finnish patent application FI992214.As multiple pressure district calender, can use the calender that is disclosed among the Finnish patent FI96334 and commercially available OptiLoad TMThe board calender, the weight of each roller descends in the roller group of described calender, so identical linear load is arranged in each nip.Multiple pressure district calender here is meant and comprises that at least therefore three rollers that contact with each other form the calender of two nips between each roller.The roller group of multiple pressure district calender can be positioned at a vertical plane, perhaps has a certain degree with vertical plane shape.Multiple pressure district calender also can be formed according to the independently roller group on same framework or different frames by several, and therefore in some sense, each roller group self just forms a multiple pressure district calender.In installing as described in the present invention, the soft press-polishing machine of 2-4 nip is arranged and have the multiple pressure district calender of 4-7 nip that required glossiness of finished product of the present invention and smoothness are provided.About this point, the surface temperature of hot-rolling is at least 150 ℃ in the soft press-polishing machine, and linear load is between 50-500kN/m; And the surface temperature of hot-rolling is at least 120 ℃ in the multiple pressure district calender, and linear load is between 150-600kN/m.The humidity of paper web is adjusted between the 5-11% before the press polish of end, preferably between the 5-9%.
The paper machine is crimping machine at last, for example commercially available OptiReel TMThe board crimping machine, its purposes is disclosed among the Finnish patent FI91383.The amount minimum of broken bottom this crimping machine makes, and can obtain high-quality roll web, therefore when being done further processing, roll web can not go wrong.
Suitable automatic control and measurement device combine with method of the present invention and paper machine, described paper machine is used to produce the LWC printing paper that is coated with a time, for example be used to measure and correct the vertical and horizontal full width character of paper web, or be used to finish graded fast.As measurement device, for example used crossbeam with a plurality of sensors or scanner, scanning device is for example used in the variation that can also measure paper machine direction simultaneously.
In a word, we can say that the LWC printing paper of high-quality coating one time can be with paper machine High-efficient Production as described in the present invention.
Use full width character control appliance, can be corrected in the full width change of properties of finding in the paper web by the different parts on production line.It is quantitative that the concentration of regulating slurry in the head box can be controlled the full width of paper web.At press section, can increase and regulate the solid content of full width with steam chest.The dry drying effect that can guarantee full width of blowing, and, also can regulate the solid content of full width with humidification apparatus at drying section.OptiSizer TMThe type coating machine can full width be regulated top sizing/coating weight.
About the present invention, also can use to be suitable for controlling the device that paper web curls, these devices are disclosed in Finnish patent application 906216,950434,964830 and 972080.
Description of drawings
The present invention will be described below with reference to accompanying drawings, yet this is not in order in detail the present invention to be carried out the restriction of exclusiveness.
Fig. 1 has provided the forming section and the press section of paper machine as described in the present invention.
Fig. 2 has provided the upstream extremity of predrying portion.
Fig. 3 has provided the downstream of predrying portion.
Fig. 4 has provided precalender, coating station and back drying section.
Fig. 5 has provided end calender and crimping machine.
Fig. 6 has provided the body paper of press polish not, conventional pre-press polish body paper and through the functional relation between the bulk of the PPS-s10 roughness of the body paper of strong pre-press polish and body paper.
Fig. 7 has provided not pre-press polish body paper and the strong Cobb-Unger oil absorbency of the body paper of press polish in advance of process and the functional relation between the bulk of the body paper of press polish, routine.
Fig. 8 provided coated paper the PPS-s10 roughness and according to prior art carried out pre-press polish and the bulk of the LWCO printing paper that was coated with scraper rubbing method and film coated method and the LWCR printing paper that was coated with the scraper rubbing method between functional relation.
Fig. 9 has provided that as the usefulness film coated method of bulk function coating is gone over and has gone over and through the roughness of the LWCO printing paper of press polish in advance by force according to the roughness of the LWCO printing paper of the pre-press polish of prior art with the coating of film coated method.
Figure 10 has provided that as the usefulness film coated method of bulk function coating is gone over and has gone over and through the roughness of the LWCR printing paper of press polish in advance by force according to the roughness of the LWCR printing paper of the pre-press polish of prior art with the coating of film coated method.
The specific embodiment
Along the traffic direction of paper web W, the paper machine shown in Fig. 1-5 comprises head box 100, Aladdin former 200, press section 300, predrying 400, pre-calecder section 500, coating station 600, back drying section 700, end calender 800 and crimping machine 900.
Fig. 1 has provided the upstream extremity of paper machine, i.e. head box 100, Aladdin former 200 and press section 300.Head box 100 is dilution headbox preferably, and it also can comprise the layering of fiber and/or filler and/or fiber fines and/or auxiliary agent.Aladdin former 200 comprises the shaping district that has formed a perpendicular between 202, two net rings of the first net ring, the 201 and second net ring.Slurry is transported to from head box 100 in the gap of the first and second net rings, 201,202 formation, and two net rings are between vacuum forming roller 203 and breast roll 204.In the district that is shaped, first dewatering unit 206 is placed in the first net ring, 201 inboards, and second dewatering unit 207 that comprises the load dewatering elements is placed in the second net ring, 202 inboards.By means of dewatering unit 206,207 water is removed from paper web, and the evenness of the paper web that is being shaped also is improved.In the end that is shaped the district, changed the traffic direction of the paper web W that is shaped by means of the negative pressure of the vacuum furnace 205 that is placed on the second net ring, 202 inboards, by the attraction of this negative pressure, the paper web W and the first net ring 201 separate and are attached on the second net ring 202.Afterwards, paper web W is transported to pick-up point P under the supporting of the second net ring 202, at the pick-up point place, vacuum extractor roll 303 makes paper web W separate with the second net ring 202, and paper web W is transported to press section 300 under the supporting of first press felt 301 (promptly with the paper woollen blanket) then.
At press section 300, transmit between first press felt 301 above paper web W is clipped in and second press felt 302 of below, here, paper web W runs to the first nip NP1.The first nip NP1 is the extension nip that is formed by a roller 305 on the following shoe roll 306 of band load shoe and band shell and the concave surface.Behind the first nip NP1,, paper web W is separated at the first branchpoint S1 place with first press felt 301, and make it to be attached on second press felt 302 by means of the negative pressure of the first vacuum delivery roll 304 that is positioned at second press felt, 302 inboards.Afterwards, paper web W is passed to the second branchpoint S2 under the supporting of second press felt 302, at this point place by means of the negative pressure of the second vacuum delivery roll 313 that is positioned at the 3rd press felt 311 inboards, paper web W is separated with second press felt 302, and make it to be attached on the 3rd press felt 311.Afterwards, paper web W is passed to the second nip N2 under the supporting of the 3rd press felt 311.Paper web W moves in the second nip N2 between press felt 311 and the 4th time press felt 312 on the 3rd.The second nip N2 is by band load shoe and the last shoe roll 316 of band shell and the extension nip that the following roller 315 of concave surface forms.After the second nip NP2, paper web W separates with the 3rd press felt 311 and be passed to the 3rd branchpoint S3 under the supporting of the 4th press felt 312, encircle the negative pressure of the 4th vacuum delivery roll 410 of 419 inboards at this point place by the dried net of the first dry group R1 that is positioned at predrying 400, paper web W is separated with the 4th press felt 312.Afterwards, paper web W is passed to predrying 400 under the supporting of described dried net 419.
Here, also can use such press section, wherein, the press felt 311,312 among the second nip NP2 has one can replace with the conveyer belt that does not absorb water basically.Conveyer belt can guarantee that paper web W follows conveyer belt after the second nip NP2, and paper web W is passed to predrying 400 on the conveyer belt surface.
Fig. 2 has provided predrying 400 upstream extremity, at first illustrates three drying group R1, R2, R3 that adopt single net traction.First group of R1 is the drying group R1 that Open Side Down, and wherein hot drying cylinder 411,412,413 is positioned at the top, and vacuum slewing rollers 414,415 are positioned at the below.
By means of the negative pressure of the vacuum tank 416 that is positioned at described dried net 419 inboards, paper web W is brought to predrying 400 under the supporting of the dried net 419 of the first dry group R1.Afterwards, paper web W moves along the serpentine path between drying cylinder 411,412,413 and the vacuum slewing rollers 414,415.There is the element 417 (runnabilitycomponent) of a control operation the first vacuum slewing rollers, 414 tops, and it guarantees the operation of the paper web W that section between the first vacuum slewing rollers 414 and the last drying cylinder 411,412 is interior.
Paper web W organizes last drying cylinder 413 of R1 by the gap between the dried net 429 of the described drying cylinder 413 and the second dry group R2 from first drying, be passed to the top of the dried net 429 of the second dry group R2, and be passed on the first vacuum slewing rollers 424 of the second dry group R2.Paper web W is passed on first drying cylinder 421 of the second dry group R2 from described vacuum slewing rollers 424, and then is delivered to and is positioned at major diameter underground between the paper locomotive (diameter is more preferably greater than 4 meters) and impacts drying cylinder and/or penetrate on the drying cylinder 420.The impact unit of impacting drying cylinder 420 is labeled as 420a and 420b.Paper web W is passed to second drying cylinder 422 of the second dry group R2 from impact drying cylinder 420, and then the second vacuum slewing rollers 425 of walking around the second dry R2 of group that wriggle are delivered on last drying cylinder 423 of the second dry group R2.Operation control element 426,427 is placed on the vacuum slewing rollers 424,425 of the second dry group R2.Be positioned at underground impact drying cylinder between the paper locomotive and/or penetrate drying cylinder 420 and for the machine direction that paper web advances, provide long drying distance for paper web.
Last drying cylinder 423 since the second dry group R2, paper web W transmits in the gap between the dried net 439 of described drying cylinder 423 and the 3rd dry group R3, be delivered to the top of the dried net 439 of the 3rd dry group R3, and be passed on the first vacuum slewing rollers 434 of the 3rd dry group R3.Afterwards, the paper web W operation of between the drying cylinder 431,432,433 of the 3rd dry group R3 and vacuum slewing rollers 435,436, wriggling.The element 437 of control operation is positioned on the first vacuum slewing rollers 434 of the 3rd dry group R3.
Fig. 3 has provided predrying 400 downstream, illustrates back four dry group R4-R7.The 4th is structurally consistent with the second dry group R2 with the 6th dry group R4, R6.Next, the 5th is structurally consistent with the 3rd dry group R3 with the 7th dry group R5, R7.Like this, just comprise seven dry group R1-R7 for predrying 400 altogether.The second, the 4th and the 6th dry group R2, R4, R6 have and are positioned at underground impact drying cylinder 420,440,460 and corresponding impact unit 420a, 420b, 440a, 440b, 460a, 460b.
From the top of forming section 200 to predrying 400 end, the operation of paper web W be sealing and supported.
Fig. 4 has provided precalender 500, coating station 600 and the back drying section 700 after being positioned at predrying 400.
Last drying cylinder 473 beginning of the dry group of from predrying 400 last (promptly the 7th) R7, paper web W is delivered to precalender 500 in the mode of opening paper injection through first measurement device 490.The croos profile character of paper web W is measured in first measurement device 490, and purpose is that the precompressed light time can consider in first measurement device 490 variation of finding.Seek to compensate with the variation of full width press polish to paper web croos profile character.
Precalender 500 can be soft press-polishing machine, boots formula calender or belt calender.The nip of soft press-polishing machine is formed on the hot-rolling with stiff dough and has between the backing roll of elastic surface.The nip of boots formula calender is formed on the hot-rolling with stiff dough and is used as between the shoe roll of backing roll.The nip of belt calender can be formed on hot-rolling with stiff dough and between the metal tape of the backing roll operation with elastic surface, perhaps at two rollers with elastic surface with between the metal tape of described roller operation.In the drawings, precalender 500 is two nip NE1, NE2 boot-shaped calender, and wherein, the first precompressed optical pressure district NE1 is formed by first shoe roll 510 of below and the first stiff dough hot-rolling 511 of top; The second precompressed optical pressure district NE2 is formed by second shoe roll 520 of top and the second stiff dough hot-rolling 521 of below.The upper surface of paper web W is close to the outer surface of first hot-rolling, 511 housings among the first precompressed optical pressure district NE1 like this, and the lower surface of paper web W is close to the outer surface of second hot-rolling, 521 housings among the second precompressed optical pressure district NE2.
About precalender 500, give first humidification apparatus 512 of paper web W and second humidification apparatus 522 of paper web W, first humidification apparatus 512 is positioned at before the first precompressed optical pressure district NE1, on the side of the hot-rolling 511 of the first precompressed optical pressure district NE1, second humidification apparatus 522 is between the first precompressed optical pressure district NE1 and the second precompressed optical pressure district NE2, on the side of the hot-rolling 521 of the second precompressed optical pressure district NE2.If desired, can regulate the humidity of paper web W with humidification apparatus 512,522, thereby make it be suitable for each precompressed optical pressure district NE1, NE2 respectively.Humidification apparatus 512,522 can also known steam humidification equipment or the water humidification apparatus of use itself.Have only when paper web W is dried too driedly, just to be necessary to use first humidification apparatus 512 in predrying 400, in this case, must before pre-press polish, increase the humidity of paper web W.Certainly, do not wish this situation to occur, but paper web W should be dried to the correct solid content that is suitable for pre-press polish in predrying 400.If do not need to strengthen the press polish effect of the second precompressed optical pressure district NE2, also can second humidification apparatus 522.Also can arrange humidification like this: humidification apparatus 512,512a are placed in the both sides of paper web W before the first precompressed optical pressure district NE1 of precalender 500, and/or humidification apparatus 522,522a are placed in the both sides of paper web W before the second precompressed optical pressure district NE2 of precalender 500.
Humidification apparatus 512,512a are placed on the suitable distance before the described nip of precalender, make the action time that enters water before the described nip at 0.05-0.5 between second.The purpose of choose reasonable action time is to make the two sides of paper web can both be by humidification, and the middle part of paper web still keeps basically not by humidification.In two nip calenders, paper web only moves very short distance between two nips, and if desired, paper web can be directed to the additional loop between two nips, and purpose is to make humidification that arranged sufficiently long action time.Another kind of possibility is that humidification only carries out before first nip of precalender.When humidification, in order to obtain required humidity, water is with 1-4g/m 2The amount of/face is added on the paper web.Whether humidification depends on the original humidity of paper web, the temperature of calender hot-rolling and the linear load of calender.
After precalender 500, paper web W is passed to coating station 600 through second measurement device 590.Coating station 600 is to adopt print roll coating 611,612 and based on the coating station 600 of film transfer, the wherein two sides of paper web while top sizing/coating.This coating station efficient is very high, and shorter relatively along paper machine direction.Second measurement device 590 is measured the croos profile character of paper web W, can consider the variation of finding in second measurement device 590 when purpose is to be coated with.Seek the variation of paper web croos profile character is compensated with the full width coating.
After coating station 600, paper web W is passed to back drying section 700.Back drying section 700 is mainly formed by the short cylinder group 720 of contactless drying section 710 and the single net traction of employing.Contactless drying section 710 comprises contactless turning facilities 712 and the infra-red drying unit 713 of paper web pneumatic conveyer dryer 711, paper web W.Dry group 720 comprises dried net 729, hot drying cylinder 721,722 and the vacuum slewing rollers 723 between hot drying cylinder 721,722.Between contactless drying section 710 and cylinder group 720, paper web W is passed to the 3rd measurement device 790.The 3rd measurement device 790 is measured the full width character of paper web W, can consider the variation of finding in the 3rd measurement device 790 when purpose is the end press polish.Seek the variation of paper web croos profile character is compensated with the press polish of full width end.
Fig. 5 has provided end calender 800 and crimping machine 900.
Paper web W is delivered to the end calender 800 that is formed by two nip soft press-polishing machines from last drying cylinder 722 of the cylinder group 720 of back drying section 700.The first calendering nip N1 is formed on the lower roll 810 with elastic surface and has between the last hot-rolling 811 of stiff dough, and the second calendering nip N2 is formed on the top roll 820 with elastic surface and has between the following hot-rolling 821 of stiff dough.End calender 800 also can use the soft press-polishing machine with 4 nips or have the multiple pressure district calender of 4-7 nip.In end calender 800, the glossiness on paper web W surface increases substantially.Paper web W is delivered to crimping machine 900 from last one calendering nip N2 of end calender 800, and in crimping machine, paper roll 910 is formed by reeling of paper web.
Fig. 6 has provided the PPS-s10 roughness of body paper, and it is the function of bulk.Closed square is represented the not measured value of press polish body paper, and wherein the PPS-s10 roughness is between 6.2-7.1 μ m, and bulk is at 1.95-2.21cm 3Between/the g.Open diamonds representative is according to the measured value of prior art with the body paper of the pre-press polish of single nip calender, and wherein the PPS-s10 roughness is between 4.0-5.6 μ m, and bulk is at 1.7-1.9cm 3Between/the g.Through the measured value of the body paper of strong pre-press polish, wherein the PPS-s10 roughness is between 2.2-3.4 μ m on two nip soft press-polishing machines for filled circles representative, and bulk is at 1.22-1.52cm 3Between/the g.Through the measured value of the body paper of strong pre-press polish, wherein the PPS-s10 roughness is between 2.1-2.8 μ m on four nip soft press-polishing machines for black triangle representative, and bulk is at 1.22-1.32cm 3Between/the g.Through the measured value of the body paper of strong pre-press polish, wherein the PPS-s10 roughness is between 2.6-3.0 μ m on two nip boots formula calenders for hollow square representative, and bulk is at 1.45-1.58cm 3Between/the g.This figure shows that the PPS-s10 roughness through the body paper of strong pre-press polish can be lower than 3.5 μ m, but compares with traditional pre-press polish, and bulk slightly descends simultaneously.
Fig. 7 has provided the Cobb-Unger oil absorbency of body paper, and this is the function of bulk.Closed square is represented the not measured value of press polish body paper, and wherein the Cobb-Unger oil absorbency is at 16-28g/m 2Between, and bulk is at 1.95-2.21cm 3Between/the g.The open diamonds representative is according to the measured value of prior art with the body paper of the pre-press polish of single nip calender, and wherein the Cobb-Unger oil absorbency is at 13-26g/m 2Between, and bulk is at 1.7-1.9cm 3Between/the g.Through the strong measured value of the body paper of press polish in advance, wherein the Cobb-Unger oil absorbency is at 6.5-14.5g/m on two nip soft press-polishing machines in the filled circles representative 2Between, and bulk is at 1.22-1.48cm 3Between/the g.Through the strong measured value of the body paper of press polish in advance, wherein the Cobb-Unger oil absorbency is at 8-13.5g/m on four nip soft press-polishing machines in the black triangle representative 2Between, and bulk is at 1.22-1.32cm 3Between/the g.Through the strong measured value of the body paper of press polish in advance, wherein the Cobb-Unger oil absorbency is at 12-15g/m on two nip boots formula calenders in the hollow square representative 2Between, and bulk is at 1.45-1.59cm 3Between/the g.This figure shows that the Cobb-Unger oil absorbency through the body paper of strong pre-press polish can be lower than 15g/m 2, but compare with traditional pre-press polish, bulk slightly descends simultaneously.
From Fig. 6 and 7 as can be seen, body paper through strong pre-press polish can access enough low PPS-s10 roughness and enough low Cobb-Unger oil absorbency, this is in order to be coated with body paper with film coated method or noncontact rubbing method, to be used for producing LWCR paper.The PPS-s10 roughness and the Cobb-Unger oil absorbency of the pre-press polish body paper of tradition need the scraper rubbing method, and purpose is to produce the paper that satisfies the LWCR quality requirement.
Fig. 8 has provided the PPS-s10 roughness of the LWC printing paper that is coated with a time, and this is the function of bulk.Body paper is produced with pre-press polish method on single nip calender according to prior art, and wherein the temperature of hot-rolling is between 60-100 ℃, and linear load is between 10-60kN/m.The solid diamond representative measured value of the LWCO paper of film coated method or the coating of noncontact rubbing method, wherein the PPS-s10 roughness is between 1.12-1.7 μ m, and bulk is at 0.815-0.93cm 3Between/the g.Next, the open circles representative measured value of the LWCO paper of scraper rubbing method coating, wherein the PPS-s10 roughness is between 0.9-1.57 μ m, and bulk is at 0.81-1.0cm 3Between/the g.The hollow triangle representative measured value of the LWCR paper of scraper rubbing method coating, wherein the PPS-s10 roughness is between 0.6-0.92 μ m, and bulk is at 0.77-0.92cm 3Between/the g.
Fig. 9 has provided the roughness that is coated with one time LWCO printing paper with the film coated method, and this is the function of bulk.Open diamonds representative is crossed with the pre-press polish of single nip calender of the prior art and is coated with the measured value of one time printing paper with the film coated method, and wherein the PPS-s10 roughness is between 1.7-1.75 μ m, and bulk is about 0.94cm 3/ g.Filled circles representative is coated with the measured value of one time printing paper through strong pre-press polish and with the film coated method on two nip soft press-polishing machines, wherein the PPS-s10 roughness is between 1.21-1.39 μ m, and bulk is at 0.9-0.95cm 3Between/the g.The result shows that the PPS-s10 roughness of LWCO printing paper produced according to the invention is lower, and its bulk almost the analog value with the LWCO printing paper of producing with the pre-press polish method of tradition is the same high.
Figure 10 has provided the roughness that is coated with one time LWCR printing paper with the film coated method, and it is the function of bulk.Open diamonds representative is crossed with the pre-press polish of single nip calender of the prior art and is coated with the measured value of one time LWCR printing paper with the scraper rubbing method, and wherein the PPS-s10 roughness is between 1.15-1.30 μ m, and bulk is at 0.93-1.02cm 3Between/the g.Filled circles representative is coated with the measured value of one time LWCR printing paper through strong pre-press polish and with the film coated method on two nip soft press-polishing machines, wherein the PPS-s10 roughness is between 0.85-1.15 μ m, and bulk is at 0.875-1.02cm 3Between/the g.Black triangle representative is coated with the measured value of one time LWCR printing paper through strong pre-press polish and with the film coated method on four nip soft press-polishing machines, wherein the PPS-s10 roughness is between 0.97-1.29 μ m, and bulk is at 0.92-1.00cm 3Between/the g.Hollow square representative is coated with the measured value of one time LWCR printing paper through strong pre-press polish and with the film coated method on two nip boot-shaped calenders, wherein the PPS-s10 roughness is between 1.1-1.21 μ m, and bulk is at 0.92-0.97cm 3Between/the g.The result shows that the PPS-s10 roughness of LWCR printing paper produced according to the invention is suitable with the analog value of the LWCR printing paper of producing with the pre-press polish method of tradition.
Result of the present invention shown in Fig. 6-10 obtains with the body paper that contains 70% mechanical pulp at least.In slurry, also used the recycled fiber of 0-40%, in this case, the aforementioned proportion of mechanical pulp also comprises mechanical pulp fiber contained in the recycled fiber.The ratio of chemical pulp is 0-30%, and this also comprises chemical pulp fiber contained in the recycled fiber.Pre-press polish according to prior art is carried out on single nip calender, and wherein the temperature of hot-rolling is between 60-100 ℃, and linear load is between 10-60kN/m.In strong pre-press polish, use soft press-polishing machine that 2-4 nip arranged and the boots formula calender that 2 nips are arranged.The temperature of the hot-rolling of precalender is between 200-300 ℃, and linear load is between 50-500kN/m.The humidity of body paper is 5-20% before the precalender, the speed of service 1500-2200 rice/minute between.The end calender uses heat roller temperature to be 200 ℃ and the soft press-polishing machine of 2-4 nip to be arranged and heat roller temperature is 150 ℃ and the multiple pressure district calender of 5-7 nip is arranged.
The result that different pre-calendering devices obtain there is no need very directly to compare.Maximum test sequence is carried out on two nip soft press-polishing machines, can optimize the precompressed optical parameter and/or the end press polish parameter of some final results in this case better.
Claim is seen below.Details of the present invention can change in the invention thought that described claim limits to some extent, and with only be can be different with the disclosed content of way of example.

Claims (44)

1. method of LWC printing paper of producing coating one time comprises following consecutive steps:
Slurry is transported to Aladdin former (200) by head box (100), in Aladdin former (200), the dehydration (W) along both direction from paper web,
Paper web (W) is delivered in the press section (300) that comprises an extension nip at least, in press section (300), by squeezing dehydration from paper web (W),
Paper web (W) is delivered to predrying (400), in predrying (400), adopts drying cylinder (R1-R7) that paper web (W) is carried out drying at least,
Paper web (W) is delivered to precalender (500), and in precalender (500), (W) carries out pre-press polish to paper web,
Paper web (W) is delivered to the part that comprises drying section (700) behind at least one coating station (600) and, in this part, use film coated method or noncontact rubbing method that the two sides of paper web (W) all is coated with, adopt contactless drying (710) that paper web (W) is carried out drying at least
Paper web (W) is delivered to end calender (800), in end calender (800), paper web is carried out press polish, then
Paper web (W) is delivered to reeling end (900), in reeling end (900), paper web (W) is rolled into paper roll (910),
It is characterized in that:
In precalender (500), make paper web (W) by at least one nip (NE1, NE2), thereby the two sides of paper web (90) is all contacted with the press polish bearing-surface, the surface temperature of press polish bearing-surface is at least 200 ℃, preferably is at least 250 ℃, wherein, the nip total length of precalender (500) is between 15-600mm, the linear load of each nip is preferably between the 100-400kN/m between 50-500kN/m
At first nip (NE1) of precalender (500) before, the humidity regulation of paper web (W) between the 5-20%, is preferably between the 6-15%.
2. the method for claim 1, it is characterized in that: paper web carries out pre-press polish in soft press-polishing machine, in soft press-polishing machine, paper web is formed on hot-rolling (511 by twice at least, 521) and elastic surface roller (510,520) nip (NE1 between, NE2), thereby make described hot-rolling (511,521) in described nip, alternately be positioned on the opposite face of paper web, wherein, hot-rolling (511,521) surface temperature is at least 200 ℃, preferably be at least 250 ℃, nip (NE1, NE2) total length is between 15-600mm, be preferably between the 30-600mm, nip (NE1, NE2) linear load is between 50-500kN/m, be preferably between the 100-400kN/m, the humidity of the preceding paper web of first nip (NE1) (W) of precalender (500) is preferably between the 6-15% between 5-20%.
3. the method for claim 1, it is characterized in that: paper web carries out press polish in boots formula calender, in boots formula calender, paper web is formed on shoe roll (510 by twice at least, 520) and stiff dough hot-rolling (511,521) nip (NE1 between, NE2), thereby make described hot-rolling (511,521) at described nip (NE1, NE2) alternately be positioned on the opposite face of paper web in, wherein, hot-rolling (511,521) surface temperature is at least 200 ℃, preferably be at least 250 ℃, nip (NE1, NE2) total length is between 15-600mm, be preferably between the 30-600mm, nip (NE1, NE2) linear load is between 50-500kN/m, be preferably between the 100-400kN/m, the humidity of first nip (NE1) of precalender (500) paper web (W) before is preferably between the 6-15% between 5-20%.
4. as claim 2 or 3 described methods, it is characterized in that: that surface on the hot-rolling that will be attached to first nip (NE1) (511) of paper web (W) is preceding by humidification at first nip (NE1) at least, has therefore strengthened the surface temperature influence surperficial to paper web (W) of the hot-rolling (511) of precalender.
5. as claim 2 or 3 described methods, it is characterized in that: the temperature influence surperficial to paper web (W) of the hot-rolling (521) of second nip by humidification, therefore strengthened in that surface on the hot-rolling that will be attached to second nip (NE2) (521) of paper web (W) between first and second nips (NE1, NE2) at least.
6. as any described method among the claim 2-5, it is characterized in that: the asymmetry of paper surface porosity and roughness is compensated by dual lustre surfaces in precalender, the temperature of the humidity (512,522) by regulating paper web (W) and/or the hot-rolling (511,521) of nip (NE1, NE2) can make the tightness increment of the bigger paper surface of the tightness incremental raio tightness of the bigger paper surface of porosity big.
7. the method for claim 1, it is characterized in that: paper web (W) carries out pre-press polish in belt calender, this belt calender has the nip that is formed between hot-rolling and the metal tape, this metal tape has the backing roll surface operation of elastic surface, wherein, the surface temperature of hot-rolling and metal tape is at least 200 ℃, preferably be at least 250 ℃, nip length is between 15-600mm, be preferably between the 30-600mm, the linear load of nip is preferably between the 100-400kN/m between 50-500kN/m, the humidity of the preceding paper web of precalender (500) is preferably between the 10-20% between 5-20%.
8. method as claimed in claim 7 is characterized in that: the two sides of paper web (W) before all by humidification (512,512a), has therefore been strengthened the influence of the temperature of the hot-rolling of nip and thermometal band to paper web (W) surface in precalender (500).
9. as any described method among the claim 1-8, it is characterized in that: described head box (100) usefulness be dilution headbox.
10. method as claimed in claim 9 is characterized in that: described head box (100) uses the multilayer dilution headbox, and wherein, fiber and/or auxiliary agent and/or filler are by layering.
11. as any described method among the claim 1-10, it is characterized in that: described Aladdin former (200) adopts the Aladdin former that has forming rolls (203) and dewatering unit (206,207).
12. as any described method among the claim 1-11, it is characterized in that: described press section (300) adopts the press section that has two continuous extension nips (NP1, NP2), wherein said extension nip is formed on the shoe roll (306,316) and the concave surface that have the elastic webbing shell and props up between the roller (305,315), wherein said roller is positioned in first nip (NP1) on the surface of paper web (W), is positioned in second nip (NP2) on another surface of paper web (W).
13. method as claimed in claim 12 is characterized in that: paper web (W) is positioned at two press felts (301,302 at two; 311,312) operation in the nip between (NP1, NP2).
14., it is characterized in that as any described method among the claim 1-13: cylinder group (R1-R7) that paper web (W) draws with the single net of employing in predrying (400) and the impingement drying unit that links to each other with described cylinder group (420,420a, 420b; 440,440a, 440b; 460,460a 460b) carries out drying.
15., it is characterized in that as any described method among the claim 1-14: paper web (W) predrying (400) afterwards and precalender (500) be passed to first measurement device (490) before, measure the full width character of paper web (W) at this.
16., it is characterized in that as any described method among the claim 1-15: paper web (W) precalender (500) afterwards and coating station (600) be passed to second measurement device (590) before, measure the full width character of paper web (W) at this.
17. as any described method among the claim 1-16, it is characterized in that: in back drying section (700), paper web (W) is passed to the 3rd measurement device (790) with cylinder dried portion (720) afterwards before at contactless drying section (710), measures the full width character of paper web (W) at this.
18. as any described method among the claim 1-17, it is characterized in that: the full width of paper web (W) character is adjusted on paper web (W) the full width character based measurement and controls.
19. as any described method among the claim 1-18, it is characterized in that in predrying (400), by the impact unit (420a, the 420b that link to each other with impact drying cylinder (420,440,460); 440a, 440b; 460a, 460b) paper web (W) drying is carried out the full width adjusting.
20. as any described method among the claim 1-19, it is characterized in that: paper web (W) carries out press polish in the end calender (800) that is formed by the soft press-polishing machine with 2-4 nip (N1, N2), wherein the surface temperature of hot-rolling is at least 150 ℃, the linear load of nip is between 50-500kN/m, the humidity of paper web is preferably between the 5-9% between 5-11% before first nip of end calender (800).
21. as any described method among the claim 1-19, it is characterized in that: paper web (W) carries out press polish in the end calender (800) that is formed by the multiple pressure district calender with 4-7 nip, wherein the surface temperature of hot-rolling is at least 120 ℃, the linear load of nip is between 150-600kN/m, the humidity of paper web is preferably between the 5-9% between 5-11% before first nip of end calender (800).
22. a paper machine of producing the LWC printing paper that is coated with a time comprises along paper web (W) traffic direction:
Head box (100), slurry therefrom is transported to former,
The Aladdin former (200) of dehydration (W) along both direction from paper web,
The press section (300) that comprises at least one extension nip,
At least adopt drying cylinder (R1-R7) that paper web (W) is carried out dry predrying (400),
The precalender (500) that paper web (W) is carried out pre-press polish,
At least a portion that forms by coating station (600) and back drying section (700) subsequently, in this part, use film coated method or noncontact rubbing method that the two sides of paper web (W) all is coated with, adopt contactless drying (710) that paper web (W) is carried out drying at least
The end calender (800) that paper web (W) is carried out press polish,
Batch the reeling end (900) of paper web (W),
It is characterized in that:
Precalender (500) is the precalender that has at least one nip (NE1, NE2), wherein, the two sides of paper web (90) all contacts with the press polish bearing-surface, the surface temperature of press polish bearing-surface is at least 200 ℃, preferably be at least 250 ℃, the nip total length of precalender is between 15-600mm, be preferably between the 30-600mm, the linear load in precompressed optical pressure district is between 50-500kN/m, be preferably between the 100-400kN/m, paper web (W), is preferably between the 6-15% between 5-20% in the preceding humidity of first nip (NE1) of calender.
23. paper machine as claimed in claim 22, it is characterized in that: precalender (500) is formed by soft press-polishing machine, wherein have at least twice to be formed on elastic surface roller (510,520) and stiff dough hot-rolling (511,521) nip (NE1 between, NE2), thereby make described hot-rolling at described nip (NE1, NE2) alternately be positioned on the opposite face of paper web in, hot-rolling (511,521) surface temperature is at least 200 ℃, preferably be at least 250 ℃, nip (NE1, NE2) total length is between 15-600mm, be preferably between the 30-600mm, nip (NE1, NE2) linear load is between 50-500kN/m, be preferably between the 100-400kN/m, the humidity of the preceding paper web of first nip (NE1) of precalender (500) is preferably between the 6-15% between 5-20%.
24. paper machine as claimed in claim 22, it is characterized in that: precalender (500) is formed by boots formula calender, wherein have at least twice to be formed on shoe roll (510,520) and stiff dough hot-rolling (511,521) nip (NE1 between, NE2), thereby make described hot-rolling at described nip (NE1, NE2) alternately be positioned on the opposite face of paper web in, hot-rolling (511,521) surface temperature is at least 200 ℃, preferably be at least 250 ℃, nip (NE1, NE2) total length is between 15-600mm, be preferably between the 30-600mm, nip (NE1, NE2) linear load is between 50-500kN/m, be preferably between the 100-400kN/m, the humidity of the preceding paper web of first nip (NE1) of precalender (500) is preferably between the 6-15% between 5-20%.
25. as claim 23 or 24 described paper machines, it is characterized in that: described paper machine comprises first humidification apparatus (512), first humidification apparatus (512) is preceding along first nip (NE1) that the traffic direction of paper web (W) is positioned at precalender (500), at least be used to add that surface on the hot-rolling that will be attached to first nip (NE1) (511) of wet web (W), the temperature of hot-rolling (511) of therefore having strengthened first nip is to the influence on paper web (W) surface.
26. as claim 23 or 24 described paper machines, it is characterized in that: described paper machine comprises second humidification apparatus (522), second humidification apparatus (522) is positioned between first and second nips (NE1, NE2) of precalender (500) with respect to the traffic direction of paper web (W), at least be used to add that surface on the hot-rolling that will be attached to second nip (NE2) (521) of wet web (W) between first and second nips (NE1, NE2) by humidification, the temperature of hot-rolling (521) of therefore having strengthened second nip is to the influence on paper web (W) surface.
27. as any described paper machine among the claim 22-26, it is characterized in that: described precalender (500) is two-sided, the temperature of the humidity (512,522) by regulating paper web and/or the hot-rolling (511,521) of described nip (NE1, NE2), can make the tightness increment of the bigger paper surface of the tightness incremental raio tightness of the bigger paper surface of porosity big, thereby the asymmetry of paper surface porosity and smoothness is compensated.
28. paper machine as claimed in claim 22, it is characterized in that: described precalender is formed by belt calender, this belt calender has the nip that is formed between hot-rolling and the metal tape, this metal tape has the backing roll surface operation of elastic surface, wherein, the surface temperature of hot-rolling and metal tape is at least 200 ℃, preferably be at least 250 ℃, nip length is between 15-600mm, be preferably between the 30-600mm, the linear load of nip is preferably between the 100-400kN/m between 50-500kN/m, the humidity of the preceding paper web of precalender (500) is preferably between the 6-15% between 5-20%.
29. paper machine as claimed in claim 28, it is characterized in that: described paper machine comprises humidification apparatus (512,512a), this humidification apparatus (512,512a) is positioned at precalender (500) before along the traffic direction of paper web (W), two sides by this humidification apparatus (512,512a) paper web (W) is all by humidification, therefore strengthened the influence of the temperature of the hot-rolling of nip and thermometal band to paper web (W) surface.
30. as any described paper machine among the claim 22-29, it is characterized in that: described head box (100) is a dilution headbox.
31. as any described paper machine among the claim 22-30, it is characterized in that: described head box (100) is the multilayer head box.
32. any described paper machine as among the claim 22-31 is characterized in that: described Aladdin former (200) is the Aladdin former that has vacuum forming roller (203) and at least one cutter formula load unit (206).
33. as any described paper machine among the claim 22-32, it is characterized in that: described press section (300) is the press section that has two extension nips (NP1, NP2), and described extension nip (NP1, NP2) is formed on the shoe roll (306,316) and the concave surface that have shell and load boots and props up between the roller (305,315).
34. paper machine as claimed in claim 33 is characterized in that: each nip of described press section (200) (NP1, NP2) is a dual press woollen blanket (301,302; 311,312).
35. any described paper machine as among the claim 22-34 is characterized in that: predrying (400) comprise the cylinder group (R1-R7) that adopts single net traction and link to each other with described cylinder group and have impact unit (420a, 420b; 440a, 440b; 460a, impact drying cylinder 460b) (420,440,460).
36. any described paper machine as among the claim 22-35 is characterized in that: described coating station (600) is the film coated station of adopting two-sided print roll coating (611,612).
37. any described paper machine as among the claim 22-36 is characterized in that: described back drying section (700) comprises contactless drying section (710), is a cylinder group (720) afterwards.
38. as any described paper machine among the claim 22-37, it is characterized in that: it comprises along the paper web traffic direction and is positioned at first measurement device (490) between predrying (400) and the precalender (500), measures the full width character of paper web (W) at this.
39. as any described paper machine among the claim 22-38, it is characterized in that: it comprises along paper web (W) traffic direction and is positioned at second measurement device (590) between precalender (500) and the coating station (600), measures the full width character of paper web (W) at this.
40. as any described paper machine among the claim 22-39, it is characterized in that: it comprise along paper web (W) traffic direction be arranged in the back drying section (700) contactless drying section (710) and the 3rd measurement device (790) between the cylinder dried portion (720), this measurement paper web (W) full width character.
41. as any described paper machine among the claim 22-40, it is characterized in that: end calender (800) is the soft press-polishing machine that 2-4 road nip (N1, N2) arranged.
42. any described paper machine as among the claim 22-40 is characterized in that: end calender (800) is the multiple pressure district calender that 4-7 road nip is arranged.
43. body paper that is used to produce the LWC printing paper that is coated with a time, it is characterized in that: described body paper comprises at least 70% mechanical pulp, and the PPS-s10 roughness of body paper is lower than 3.5 μ m before the coating, is preferably lower than 3 μ m, and the Cobb-Unger oil absorbency of body paper is lower than 15g/m before the coating 2, be preferably lower than 12g/m 2, the bulk of body paper is greater than 1.0cm before the coating 3/ g is more preferably greater than 1.2cm 3/ g.
44. as body paper as described in the claim 43, it is characterized in that: described body paper is according to the method for claim 1 production.
CNB028122275A 2001-06-18 2002-06-17 Method, paper machine and base paper for the manufacture of LWC printing paper coated once Expired - Fee Related CN100343447C (en)

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DE60223385T2 (en) 2008-08-28
ATE377669T1 (en) 2007-11-15
EP1417377B1 (en) 2007-11-07
FI20011291A (en) 2002-12-19
JP2004530063A (en) 2004-09-30
CA2467100A1 (en) 2002-12-27
FI20011291A0 (en) 2001-06-18
US20050011624A1 (en) 2005-01-20
DE60223385D1 (en) 2007-12-20
WO2002103109A1 (en) 2002-12-27
CN100343447C (en) 2007-10-17

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