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CN110291250A - Production is in the upper stretchable paper of height of paper machine transverse direction - Google Patents

Production is in the upper stretchable paper of height of paper machine transverse direction Download PDF

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Publication number
CN110291250A
CN110291250A CN201880009917.4A CN201880009917A CN110291250A CN 110291250 A CN110291250 A CN 110291250A CN 201880009917 A CN201880009917 A CN 201880009917A CN 110291250 A CN110291250 A CN 110291250A
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CN
China
Prior art keywords
paper
defibrination
pulp
paper pulp
iso
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.)
Pending
Application number
CN201880009917.4A
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Chinese (zh)
Inventor
尼尔斯·诺丁
弗雷德里克·诺德斯特伦
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.)
Than Strangling Shandong Otto Dix Na Si Co
Billerudkorsnas AB
Original Assignee
Than Strangling Shandong Otto Dix Na Si Co
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 Than Strangling Shandong Otto Dix Na Si Co filed Critical Than Strangling Shandong Otto Dix Na Si Co
Publication of CN110291250A publication Critical patent/CN110291250A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • D21F9/02—Complete machines for making continuous webs of paper of the Fourdrinier type
    • 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/001—Modification of pulp properties
    • D21C9/007—Modification of pulp properties by mechanical or physical means
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/022—Heating the cylinders
    • D21F5/028—Heating the cylinders using steam
    • 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
    • D21H11/04—Kraft or sulfate pulp
    • 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
    • D21H25/005—Mechanical treatment
    • 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

A kind of method for producing paper is provided, the paper has 50-250g/m2According to the grammes per square metre of ISO 536, greater than 15s according to the grignard value of ISO 5636-5 and at least 8% tensility according to ISO 1924-3 in paper machine transverse direction, it the described method comprises the following steps: paper pulp a) is provided, preferably, the paper pulp is sulfate pulp；B) make the paper pulp experience defibrination；C) paper pulp from step b) is diluted, and diluted paper pulp is discharged in forming net with a rate of discharge to form paper web, wherein the speed of the forming net at least speed of 7m/min or forming net higher than rate of discharge is at least 7m/min at least lower than rate of discharge；D) paper web from step c) is squeezed；E) paper web from step d) is dried, the drying is included in the step of being compacted the paper web in Clupak unit.

Description

Production is in the upper stretchable paper of height of paper machine transverse direction
Technical field
The present invention relates to productions in the upper stretchable paper of height of paper machine transverse direction.
Background technique
Since two thousand nine,(Sweden) withTitle sell A kind of stretchable paper of height.In paper machine longitudinal (machi`e direction, MD) and paper machine transverse direction Tensility in (cross direction, CD) both direction can replace plastics in numerous applications.It is produced on the paper machine for including Expanda unit, which longitudinally presses along paper machine Reality/compression the paper is to improve tensility.
Summary of the invention
Purpose of this disclosure is to provide it is a kind of including Clupak (microcreping for being compacted in the machine direction to paper Stretching property) unit paper machine on produce the method for paper, the paper is that height is stretchable and be not typical in paper machine transverse direction Porous bag paper.
It thus provides a kind of method for producing paper, the paper has 50-250g/m2According to the grammes per square metre of ISO 536, Grignard value (Gurley value) greater than 15s according to ISO 5636-5 and at least 8% in paper machine transverse direction according to ISO The tensility of 1924-3, the described method comprises the following steps:
A) paper pulp is provided, it is preferable that the paper pulp is sulfate pulp；
B) make paper pulp experience defibrination (refining)；
C) paper pulp from step b) is diluted, and the diluted paper pulp is arranged with a rate of discharge It is arrived in forming net (forming wire) out to form paper web, wherein the speed of the forming net is up to than the rate of discharge The speed at least 7m/min lower than the rate of discharge of few 7m/min or the forming net；
D) paper web from step c) is squeezed；
E) paper web from step d) is dried, the drying, which is included in Clupak unit, is compacted the paper The step of width.
Detailed description of the invention
Fig. 1 is the schematic diagram of Clupak unit.
It is 38.0%, 36.1% and 31.8% pulp production for undergoing HC defibrination that Fig. 2 (on the y axis), which is shown with consistency, The tensility (%) on paper machine laterally (CD) of paper.X-axis indicates sequencing.
Fig. 3 (on the y axis) shows the tensility (%) by the laboratory paper of following production:
The paper pulp (" before high-consistency defibrination (HCR), non-defibrination ") of non-defibrination；
Only (" before low consistency defibrination (LCR) ") lives through the paper pulp of HC defibrination (150kWh/t or 220kWh/t)；With And
Live through HC defibrination (150kWh/t or 220kWh/t) and LC defibrination (" LCR 100kWh/t ", " LCR 150kWh/ The paper pulp of t " and " LCR 200kWh/t ").
Specific embodiment
This disclosure relates to the method for producing paper, the paper is preferably uncoated.It, can be right after disclosed method Paper is coated, for example, to improve printing performance and/or obtain barrier property.
The tensility that the paper is characterized in that by the paper that this method obtains is at least 8% on paper machine laterally (CD). Preferably, the tensility on CD is higher than 8%, for example, at least 9% or at least 9.5%.The tensility makes it possible to In the paper formed 3D shape (double curved shape), such as by compression moulding, vacuum forming or deep-draw in the paper shape At 3D shape.If tensility is also relatively high on machine direction or paper machine longitudinal (MD), in such technique The formability of paper is further improved.Preferably, the tensility on MD is at least 9%, for example, at least 10%, such as At least 11%.The upper limit of tensility on CD can be such as 15%.The upper limit of tensility on MD can be example Such as 20% or 25%.Tensility (tensility on MD and on CD) is measured according to standard ISO 1924-3.
Compared with many possible stretchable bag paper of height, the paper of the disclosure is not especially porous.On the contrary, for this In the application of disclosed paper, relatively low porosity may be preferred.For example, there is lower infiltration to wear for glue and some coatings Cross the tendency of the paper of low porosity.In addition, some printing performances are improved when porosity reduces.
Air drag (that is, lattice benefit porosity) according to lattice sharp (Gurley) is the given zone that 100ml air passes through paper The measurement (second, s) of domain the time it takes.Short time is meant to be highly porous paper.The lattice benefit porosity of the paper of the disclosure Greater than 15 seconds.Lattice benefit porosity is preferably at least 20 seconds, more preferably 25 seconds, for example, at least 35 seconds.The upper limit may, for example, be 120 Second or 150 seconds.Lattice benefit porosity (herein also referred to as " grignard value ") is measured according to ISO 5636-5.
The grammes per square metre of the paper of the disclosure is 50-250g/m2.It is higher than 250g/m if necessary to have2The Stretch material of grammes per square metre, Then laminated material can be manufactured by multiple paper layers, wherein the grammes per square metre of each paper layer is in 50-250g/m2In the range of.It is lower than 50g/m2When, strength and stiffness are usually insufficient.Grammes per square metre is preferably 60-220g/m2, and more preferably 80-200g/m2, such as 80-160g/m2, such as 80-130g/m2.Standard ISO 536 is for measuring grammes per square metre.When grammes per square metre is lower, Bendt Bendtsen (Bendtsen) roughness is usually lower.
The density of paper is generally between 700kg/m3With 1000kg/m3Between.Preferred density range is 700-800kg/m3With And 710-780kg/m3.Higher density generally means that the bending stiffness of reduction, this is usually undesirable.
For beautiful and printing purpose, the paper of the disclosure is preferably white.For example, can according to the brightness of the paper of ISO 2470 To be at least 80%, for example, at least 82%.But paper is also likely to be unbleached (" brown ").
It it would also be desirable to be able to the stretchable paper that production has opposite fine surface.Therefore, at least one side of paper according to ISO The Bendt Bendtsen roughness of 8791-2 can be 1900ml/min or lower, such as 1700ml/min or lower, such as 1500ml/ Min or lower.Lower limit can be 800ml/min or 500ml/min.
Technical staff is it will be appreciated that above-mentioned Bendt Bendtsen roughness value is related to uncoated paper.
Disclosed method the following steps are included:
A) paper pulp is provided.
Paper pulp is preferably sulfate pulp (sometimes referred to as " kraft pulp "), and it is strong that the sulfate pulp provides high stretching Degree.For the same reason, the raw material for being used to prepare the paper pulp preferably comprises cork (cork, which has, long fibre and to be formed strong Paper).Therefore, paper pulp may include at least 50% softwood pulp, preferably at least 75% softwood pulp, and more preferably at least 90% softwood pulp.Percentage is based on the dry weight of paper pulp.
Tensile strength is the maximum, force that paper is born before fracturing.In standard testing ISO 1924-3, using with constant Elongation the band with 15mm width and 100mm length.Tensile energy absorption (TEA) sometimes is considered as most representing The paper performance of the correlation intensity of paper.Tensile strength is a parameter in TEA measurement, and another parameter is tensility. Tensile strength, tensility and TEA value are obtained in identical test.TEA index is TEA value divided by grammes per square metre.With identical side Formula, by obtaining tensile figure divided by grammes per square metre with tensile strength.
Drying strengthening agent (such as starch) can be added to improve tensile strength.The amount of starch may, for example, be paper 1-15 thousand per ton Gram, it is 1-10 kilograms or 2-8 kilograms of paper preferably per ton.Starch is preferably cationic starch.
In the context of the disclosure, " paper per ton " refers to the dried paper per ton from paper-making process.This warp is dry Dry paper usually has the dry matter content (w/w) of 90%-95%.
May, for example, be by the TEA index of paper that disclosed method obtains: be on MD at least 3.5J/g (such as It 3.5-7.5J/g) and/or on CD is at least 2.9J/g (such as 2.9-3.9J/g).In one embodiment, TEA index exists It is higher than 4.5J/g (such as 4.6-7.5J/g) on MD and/or is higher than 3.0J/g (such as 3.1-3.9J/g) on CD.
One or more sizing agents can also be added in paper pulp.The example of sizing agent is AKD, ASA and rosin size. When adding rosin size, alum is preferably also added.Rosin size and alum are preferably added with the weight ratio between 1:1 and 1:2 Add.Rosin size can for example be added with 0.5-4 kilograms of paper of amount per ton, preferably with 0.7-2.5 kilograms of paper of amount per ton addition.
When paper is white, paper pulp is bleached.
This method is further comprising the steps of:
B) paper pulp is made to undergo defibrination.
It is shown in following example, CD tensility is improved by HC defibrination.By comparing respectively with 150kWh/ tons Paper and 220kWh/ tons of paper carry out the value of the tensility obtained after HC defibrination, and the HC defibrination for further displaying out higher degree produces Raw higher CD tensility.Also display improves CD tensility by LC defibrination.By being respectively compared respectively with 100kWh/ The value for the tensility that ton paper, 150kWh/ tons of paper and 200kWh/ tons of paper obtain, further displays out the LC defibrination of higher degree Generate higher CD tensility.
When defibrination and " freely drying " combine, influence of the defibrination to tensility is especially apparent, this will be below into one Step discusses.
When LC defibrination as the fiber orientation discussed below as caused by " injection/net ratio " when being combined, make fiber with Influence of the LC defibrination of hydrate to CD tensility is particularly significant.
Therefore, in one embodiment of the invention, step b) include make paper pulp experience high-consistency defibrination (HC defibrination, High consistency refining).In the alternative solution of supplement embodiment, step b) include make paper pulp undergo low consistency defibrination (LC defibrination, it is low Dense defibrination).
In preferred embodiments, step b) includes following sub-step:
B1 paper pulp) is made to undergo high-consistency (HC) defibrination；And
B2 the paper pulp from step b1)) is made to undergo low consistency (LC) defibrination.
The consistency for living through the paper pulp of HC defibrination is preferably at least 33%, and more preferably 36% or more.Especially excellent In the embodiment of choosing, the consistency for living through the paper pulp of HC defibrination is at least 37%, for example, at least 38% (referring to fig. 2).Consistency Typical upper limit can be 42%.
Usually implement the Xiao Baier-Rui Gele number (SR number, be beaten degree) that HC defibrination to paper pulp obtains for 13-19 (such as Degree 13-18).SR number is measured according to ISO 5267-1.In order to reach required SR number, the energy in HC defibrination is supplied Paper per ton at least 100kWh should be can be, such as paper per ton is higher than 150kWh.The typical upper limit can be paper 220kWh per ton.
The consistency for living through the paper pulp of LC defibrination is usually 2%-6%, preferably 3%-5%.LC defibrination is usually implemented to paper Xiao Baier-Rui Gele (SR) number that slurry obtains is the degree of 18-40, preferably 19-35, such as 23-35.It is required in order to reach SR number, the energy supply in LC defibrination can be paper 20-200kWh per ton, such as paper 30-200kWh per ton, such as paper per ton 40-200kWh。
As it is well known to the skilled in the art, LC defibrination increases SR number.
In one embodiment, this method further include: paper pulp or the addition being added to broken paper pulp in step b) To the step in the paper pulp between step b) and step c), the step c is discussed below.Broken paper pulp is preferably from identical Method obtains.
This method is further comprising the steps of:
C) paper pulp from step b) is diluted, and diluted paper pulp is discharged to certain rate of discharge To form paper web in forming net.
The diluted paper pulp is discharged usually as injection stream by the weir plate in head box.Then by diluted paper Slurry is dehydrated on forming net, to form paper web.Diluted paper pulp usually has the consistency of the pH and 0.2%-0.5% of 5-6.
In step c), rate of discharge at least 7m/min preferably (but not necessarily) higher than the speed of forming net, or Person's rate of discharge at least 7m/min preferably (but not necessarily) lower than the speed of forming net.This speed difference causes along paper machine The ratio of machine-direction oriented fiber increases.This and when rate of discharge is identical as the speed of forming net the case where, are contrasted, and arrange The rate orientation for leading to fiber identical as the speed of forming net is tended to be uniformly distributed in all directions out.In the machine direction The ratio increase of the fiber of orientation will increase the contraction of paper machine transverse direction in drying process, it means that CD tensility increases.
Increase it has been shown that increased speed difference causes CD to stretch.However, observing to be formed if speed difference is too big Object is impaired.Therefore, speed difference is usually more than 30m/min.
In preferred embodiments, rate of discharge is 8-25m/min higher than the speed of forming net or low 8-25m/min.? In further preferred embodiment, rate of discharge is 9-23m/min higher than the speed of forming net or low 9-23m/min.
Usually it is further preferred that rate of discharge is higher than the speed of forming net.Therefore, in a preferred embodiment, it is discharged The speed height at least 7m/min of speed ratio forming net, for example, it is 8-25m/min higher than the speed of forming net, such as than the speed of forming net Spend high 9-23m/min.
Ratio between rate of discharge and the speed of forming net is sometimes referred to as injection/net ratio (jet/wire ratio)。
In an embodiment of step c), the diluted paper pulp passes through at least 40mm, for example, at least 50mm, example As 50-70mm delivery space and be discharged.By using this relatively large gap, CD tensility becomes on entire paper web It obtains more evenly." delivery space " is referred to as " outlet opening " or " slice opening ".Weir plate usually has fixed antelabium and tune Save antelabium.In this case, outlet opening is between fixed antelabium and to adjust the gap between antelabium.
The dry content that the paper web formed in step c) usually has is 15-25%, such as 17-23%.
This method is further comprising the steps of:
D) squeezing the paper web from step c) to such as dry content is 30-50%, such as 36-46%.
Usually there is press section for step d) one, two or three to squeeze embossed region.In an embodiment In, use shoe press.In this case, the embossed region of shoe press can be unique embossed region of press section.It uses The benefit of shoe press is to improve the rigidity of final products.
This method is further comprising the steps of:
E) paper web from step d) is dried, the drying includes that the step of paper web is compacted in Clupak unit Suddenly.
The step of paper web is compacted in Clupak unit is usually the state in moisture content between 20% and 48% Lower implementation.In general, step e) be included in be compacted in Clupak unit before and after paper web is dried.
Compacting in Clupak unit increases the tensility of paper, the tensility especially on MD, but Increase the tensility on CD.In order to improve surface/printing performance, when entering Clupak unit, the moisture content of paper Preferably at least 30% (such as 30-50%), for example, at least 35% (such as 35-49%).
Higher moisture content is also proved to related to the higher tensility on MD.
In addition, it has been found by the present inventors that in Clupak unit, by the linear load of relatively high embossed region item, i.e., At least 22kN/m promotes the increase of tensility.Preferably, the linear load of embossed region item is at least 25kN/m or at least 28kN/m.It is highly preferred that the linear load of embossed region item is at least 31kN/m.The typical upper limit can be 38kN/m.In Clupak In unit, the linear load of embossed region item is controlled by the adjustable cylinder pressure being applied on the embossed region item.The pressure It prints area's item and is sometimes referred to as " pressure roller ".For example following example institute of relationship between the linear load and CD tensility of embossed region item Show.
In one embodiment, the rubber strip tension in Clupak unit is at least 5kN/m (such as 5-9kN/m), excellent It selects at least 6kN/m (such as 6-9kN/m), for example, about 7kN/m.In Clupak unit, rubber strip tension is by being applied to idler roller On adjustable cylinder pressure control, rubber strip described in the tension roller stretching.
Clupak unit generally includes steel cylinder.When paper web by contraction/rebound of the rubber strip in Clupak unit by When compacting, paper web is mobile relative to steel cylinder.In order to reduce the friction between paper web and steel cylinder, preferably addition discharges liquid.Release Liquid can be water or water base.Water base release liquid may include anti-friction agent, such as polyethylene glycol or Siloxane based agents.One In a embodiment, release liquid is the water of the polyethylene glycol comprising at least 0.5%, preferably at least 1%, such as 1-4%.
Clupak unit is described below with reference to Fig. 1.
After being compacted in Clupak unit, paper web is usually subjected to be further dried.
In one embodiment, step e) includes the dry paper web from Clupak unit in dry group, and paper Speed of the width in drier group is 8%-14% lower than the speed that paper web enters Clupak unit.Speed is reduced in this way The reason is that retaining paper web MD tensility obtained in Clupak unit.
Paper web is preferably allowed to free drying during a part of step e), especially allows after Clupak unit Freely dry.During this " freely drying " for improving tensility, paper web not (commonly referred to as knit with drier sieve by drier Object) contact.Compulsory air stream (optional heated air stream) can be used in freely drying, it means that freely dry It may include that fan is dry.
As shown in table 1 below, the side contacted with the steel cylinder in Clupak unit of the paper usually than the paper with The side of rubber strip contact in Clupak unit has finer surface.Chromium plating cylinder can be used instead of steel cylinder.Therefore, It is generally preferred that the side contacted with steel cylinder/chromium plating cylinder to paper is printed.
Therefore, this method may also comprise the following steps::
F) side of paper contacted in step e) with the steel cylinder of Clupak unit/chromium plating cylinder is printed.
Fig. 1 shows Clupak unit 105, which includes and two blanket rollers 108,109, guide reel 110, the annulus rubber cincture 107 (sometimes referred to as " rubber blanket ") that idler roller 111 and embossed region item 112 contact.First hydraulic device 113 apply pressure on idler roller 111 to stretch the rubber strip 107.Second hydraulic device 114 is applied on embossed region item 112 For plus-pressure to press to the rubber strip 107, rubber strip 107 makes paper web 117 be pressed against steel cylinder 115 again.Discharge fluid injector 116 Liquid will be discharged by, which being arranged to, is applied to steel cylinder 115.
Example
Comprehensive test
Comprehensive test is carried out to produce the stretchable paper of white on the paper machine for being generally employed to produce bag paper.Production is such as It is lower described.
Softwood Kraft pulps through bleaching are provided.Paper pulp experience: high-consistency (HC) defibrination (paper 180kWh per ton), consistency It is about 39%, and low consistency (LC) defibrination (paper 65kWh per ton) of experience, consistency is about 4.3%.Cationic starch is (per ton Paper 7kg), rosin size (paper 2.4kg per ton) and alum (paper 3.5kg per ton) be added in paper pulp.In head box, paper pulp/match The pH of material is about 5.8, and paper pulp/ingredient consistency is about 0.3%.Paper pulp is discharged to by the outlet opening in head box To form paper web in forming net.The setting of weir plate antelabium is shaped to the delivery space of 60mm.Row of the speed of forming net than paper pulp Rate is 10 ms/min low out.The dry content for leaving the paper web of the barrier section is about 19%.There are two embossed regions in tool for paper web It is dehydrated in press section, to obtain about 38% dry content.It is then the paper web through being dehydrated is dry in subsequent drying section, The drying section has the drier group of 9 arranged in series, and the drier group includes a Clupak unit.In the context In, therefore Clupak unit is considered as " drier group ".Drier group 7 is set by Clupak unit, it is intended that described Paper web is dried before and after being compacted in Clupak unit in the dry section.When into Clupak unit, The moisture content of paper web is 40%.The cylinder pressure being applied on the item of embossed region is set as 30 bars, to generate 33kN/m Linear load.The cylinder pressure for stretching rubber strip is set as 31 bars, to generate the band tensioning of 7kN/m.In order to Reduce the friction between paper web and steel cylinder in Clupak unit, release liquid (1.5% poly- second two is added with 250 ls/h of amount Alcohol).The speed of paper web in drier group located immediately at the downstream Clupak is lower than the web speed for entering Clupak unit 11%.
The performance of the paper produced in test is listed in the table below in 1.
The performance that table 1. measures the sample obtained at the top of Large Roller.
* RS indicates the side of the rubber strip in the contact Clupak unit of paper.
* SS indicates the side of the steel cylinder in the contact Clupak unit of paper.
As shown in table 1, obtained grignard value is the paper that 38s and CD tensility is 9.9%.Assuming that if the journey of LC defibrination Du Genggao, then CD tensility even can be higher.If carried out from the pattern sheet that another position in Large Roller is taken out It is measured in pattern sheet after measurement or rewinding, Bendt Bendtsen roughness value can be lower.Therefore, the Bendt Bendtsen roughness in table 1 Value is higher than the Bendt Bendtsen roughness value for being shipped for the paper of client.
The influence of consistency in HC defibrination
First it is being 38% according to the consistency in above-mentioned comprehensive test, living through the paper pulp of HC defibrination, is then leading to respectively Crossing reduces the degree that paper pulp is squeezed before HC defibrination is reduced to 36.1% and 31.8% in two steps.For 38% paper pulp, The CD tensility of gained paper is measured three times；For 36.1% paper pulp, the CD tensility of gained paper is measured four times；It is right 31.8% paper pulp measures three times the CD tensility of gained paper.As a result as shown in Fig. 2, this shows usually by increasing warp The consistency of the paper pulp of HC defibrination was gone through to improve CD tensility.36% is higher than for consistency, shows the spy of CD tensility Other active influence.
The influence of the linear load of embossed region item in Clupak unit
According in above-mentioned comprehensive test, using two different linear loads and the CD tensility of gained paper is measured. The results are shown in Table 2, the results showed that by the way that the linear load of embossed region item is increased to 33kN/m from 22kN/m, average CD is stretchable Property increases 6.8%.
Table 2.
Laboratory test
The correlation between defibrination and paper machine laterally (CD) tensility is being tested in laboratory test.It is tried in laboratory In testing, the laboratory paper of non-directional is by undergoing the paper pulp of different degrees of high-consistency defibrination and low consistency defibrination to be formed.Then Test the laboratory paper can tensility, it is described can tensility be considered representing the CD of paper formed on a papermaking machine Tensility.The result of laboratory test is as shown in Figure 3, the results showed that HC defibrination and LC defibrination all improve tensility.When HC defibrination and LC defibrination obtain particularly advantageous effect when combining.Fig. 3 show further LC defibrination degree and tensility it Between exist be positively correlated.Fig. 3 is also shown that the increase of HC defibrination degree improves tensility.

Claims (16)

1. a kind of method for producing paper, the paper has 50-250g/m2The grammes per square metre according to ISO 536, the basis greater than 15s The grignard value of ISO 5636-5 and at least 8% the tensility according to ISO 1924-3 in paper machine transverse direction, the side Method the following steps are included:
A) paper pulp is provided, it is preferable that the paper pulp is sulfate pulp；
B) make the paper pulp experience defibrination；
C) paper pulp from step b) is diluted, and the diluted paper pulp is discharged to a rate of discharge To form paper web in forming net, wherein the speed of the forming net at least 7m/min higher than the rate of discharge or it is described at The speed of shape net at least 7m/min lower than the rate of discharge；
D) paper web from step c) is squeezed；
E) paper web from step d) is dried, the drying includes that the paper web is compacted in Clupak unit Step.
2. according to the method described in claim 1, wherein, the speed of the forming net is 8-25m/min higher than the rate of discharge, Or the speed of the forming net is 8-25m/min lower than the rate of discharge.
3. method according to claim 1 or 2, wherein the diluted paper pulp via at least delivery space of 40mm, For example, at least the delivery space of 50mm, such as 50-70mm delivery space and be discharged.
4. the method according to any one of the preceding claims, wherein the paper have at least 9%, for example, at least 9.5% tensility according to ISO 1924-3 in paper machine transverse direction.
5. the method according to any one of the preceding claims, wherein the paper have at least 9%, for example, at least 10%, for example, at least 11% tensility according to ISO 1924-3 in the machine direction.
6. the method according to any one of the preceding claims, wherein step b) includes: to keep the paper pulp experience high thick Spend (HC) defibrination.
7. according to the method described in claim 6, wherein, the consistency for living through the paper pulp of HC defibrination is at least 33%, example Such as at least 37%, for example, at least 38%.
8. the method according to any one of the preceding claims, wherein step b) includes: to keep the paper pulp experience low thick Spend (LC) defibrination.
9. according to the method described in claim 8, wherein, the energy supply in the LC defibrination be paper 20-200kWh per ton, Such as paper 30-200kWh per ton, paper 40-200kWh for example per ton.
10. the method according to any one of the preceding claims, wherein in moisture content in the Clupak unit To be compacted in the state of 20%-48%, such as 30%-45%, such as 35%-45% to the paper web.
11. the method according to any one of the preceding claims, wherein embossed region item in the Clupak unit Linear load is at least 22kN/m, for example, at least 25kN/m, for example, at least 28kN/m.
12. the method according to any one of the preceding claims, wherein the paper is according to the grammes per square metre of ISO536 60-220g/m2, such as 80-200g/m2。
13. the method according to any one of the preceding claims, wherein the Ge Li according to ISO5636-5 of the paper Value is at least 20s, is preferably at least 25s, more preferably at least 35s.
14. the method according to any one of the preceding claims, wherein step e) includes: in dry group to coming from The paper web of the Clupak unit is dried, and speed of the paper web in the drier group is than the paper web Into the low 8%-14% of speed of the Clupak unit.
15. the method according to any one of the preceding claims, wherein at least one side of the paper according to ISO The Bendt Bendtsen roughness of 8791-2 be 1900ml/min or lower, such as 1700ml/min or lower, such as 1500ml/min or It is lower.
16. according to the method described in claim 1, wherein:
Step b includes following sub-step:
B1 high-consistency (HC) defibrination for) making the paper pulp experience consistency 33%-42%, until the basis that the paper pulp obtains The degree that Xiao Baier-Rui Gele (SR) number of ISO 5267-1 measurement is 13-19；And
B2) make low consistency (LC) defibrination of paper pulp experience consistency 2%-6% from step b1), until the paper pulp obtains The degree that Xiao Baier-Rui Gele (SR) number according to ISO 5267-1 measurement obtained is 18-40；And
In step c), the speed of the forming net is 7-30m/min higher than the rate of discharge or the speed of the forming net It is 7-30m/min lower than the rate of discharge.
CN201880009917.4A 2017-04-06 2018-04-05 Production is in the upper stretchable paper of height of paper machine transverse direction Pending CN110291250A (en)

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