CN1461369A - Method of mfg. newsprint - Google Patents

Method of mfg. newsprint Download PDF

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Publication number
CN1461369A
CN1461369A CN01815974A CN01815974A CN1461369A CN 1461369 A CN1461369 A CN 1461369A CN 01815974 A CN01815974 A CN 01815974A CN 01815974 A CN01815974 A CN 01815974A CN 1461369 A CN1461369 A CN 1461369A
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China
Prior art keywords
paper
newsprint
printing
press
difference
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CN01815974A
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CN1216204C (en
Inventor
石泽仁志
汤原隆
大场正昭
野岛一博
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New Oji Paper Co Ltd
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Oji Paper Co Ltd
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Publication of CN1461369A publication Critical patent/CN1461369A/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
    • D02G1/02—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist
    • 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
    • D21H11/14—Secondary fibres

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Paper (AREA)

Abstract

A method of manufacturing newsprint for offset print having no difference between the front and rear surfaces thereof and providing an excellent workability of printing by optimizing press conditions in a paper-making process and soft calendar processing conditions, comprising the steps of making paper with a materials formed mainly of wood pulp, used paper, and filler, drying the paper, and treating the paper by passing through a soft calendar, characterized in that the paper passing processing is formed of one-nip processing, and a paper surface coming into contact with the metal roll side of the soft calendar is the surface coming into contact with a felt in the final press roll of a paper making process press part.

Description

The manufacture method of newsprint
Technical field
The present invention relates to newsprint, particularly a kind of can be to cooperate the newsprint of old paper stock (DIP (de inked pulp)) at high proportion; It is a kind of manufacture method that does not have newsprint difference, that be used for hectographic printing in good, the printing quality scale that has.
Background technology
The used raw material paper pulp of newsprint is as main body with the paper pulp of machinery or old paper stock, recently, the environmental problem that causes from rubbish increase etc. and the viewpoint of saving resource, strong especially to the cooperation ratio that improves waste paper and the requirement that reduces weight per unit area.On the other hand, recently just at high speed development hectographic printing, colored printing and high speed printing, along with this develops, the newsprint that constitutes print media has also been proposed than more requiring in the past but also good colored printing adaptability and the presswork of requirement raising.
Hectographic printing is such method, promptly, with moistening water and printing-ink supply with printing forme, then make ink transfer on the flexographic that is called blanket after, it is transferred on the paper.Compared with former letterpress mode, owing to use the higher printing ink of ratio of viscosities, thereby have the advantage of the less ink bleed after ply of paper inside is soaked into, printed of printing ink less (opacity is bigger).
But, along with the light-weighted development of newsprint in recent years, the high opacity after the printing is had higher requirement, and along with the development of colorize, also inking has proposed requirement to printing ink.The printing ink inking of paper when printing in order to improve, prevailing method is to adopt calender to handle and make its smoothing,, if make calendered clamp pressure increase, make the clamping number to increase and make its smoothing, be that the printing ink inking is become well, still, owing to damaged the loosing character of paper, thereby the opacity after the printing is reduced, and rigidity is reduced, thus can be when printing, cause the fault that advancing property is bad because of wrinkle etc. takes place.Even and handle by alleviating calender, can obtain the suitable paper of loosing character, but owing to difference in the table of the inking that makes paper surface increases, particularly because smoothness reduces the inking deterioration of the paper surface of side, thereby image concentration can take place in the obvious different problem in surface and the inside.This is considered to because the dehydration conditions in the papermaking operation, on mesh portions and the press sections has subtle difference on surface and the inside, so the difference of the surface and the inside of newsprint flatness occurs, because the distribution of the filler on thickness direction, slight fiber is different surface and the inside, so that it the difference of the surface and the inside of ink transfer occurs.
On the other hand, as the method that improves the opacity after the printing all generally organic dyestuff such as inorganic dyestuff such as silicate hydrate or titanium oxide, talcum or Lauxites as papermaking filler.But, because when these filler adding rates were increased, the printing ink inking of paper surface and the inside just was easy to generate difference; But also relevant with following fault, promptly, when hectographic printing, filler is leached in ply of paper, be deposited on the rubber woollen blanket as the paper powder, so adding rate has certain limit by the effect of the employed moistening water of printing process.Because the cooperation at high proportion of DIP (deinked waste paper paper pulp) is compared with the paper pulp of machineries such as GP or RGP, TMP, difficulty presents high opacity, thereby the cooperation at high proportion of the DIP that aspect environment, relatively payes attention to (deinked waste paper paper pulp), be to be difficult to make the improvement of opacity and the cooperation at high proportion of DIP to wait this two aspect all to set up actually.
According to situation recited above, the inventor has studied a kind of method with stressing, it is in the newsprint that cooperates old paper stock at high proportion, when offset rotary prints, paper surface and the inside can both present good printing ink inking, printing opacity, and can obtain good presswork.The inventor according to research the result, made the present invention.
The purpose of this invention is to provide a kind of newsprint that can be used for hectographic printing, it is optimum by squeezing condition in the papermaking operation and soft press-polishing machine treatment conditions are become, and just can make the surface of paper and the inside not have printing quality difference and have good presswork.
Disclosure of an invention
The manufacture method of the newsprint of the present invention of making in order to reach the foregoing invention purpose, it is that wood pulp, old paper stock, filler are carried out after papermaking, the drying as the raw material of main component, on soft press-polishing machine, carry out the manufacture method of the newsprint of paper injection processing, it is characterized in that, paper injection handle be 1 clamping handle and, and the contacted paper of metallic roll side of above-mentioned soft press-polishing machine (ソ Off ト カ レ Application ダ-), be in contacted of the final pressure roller of papermaking operation press sections and felt.
Newsprint can be with various paper machine manufacturings, because when using the two net formula paper machines that are commonly referred to the gap shaping to make, just can obtain the paper of fine texture at high speed, thereby use this machine widely, it is to form such structure, promptly, the mesh portions that is shaped of gap is paper stock and it is advanced with 2 clampings of throwing the net, from the two sides approximate equality dewater.Therefore the difference that has uniform quality, paper surface and the inside is less.On the press sections after mesh portions, paper clamp is held between metallic roll and the felt, carry out press dewatering, and the moisture coverlet direction in the paper squeeze felt one side, the direction of press dewatering also is partial in the slight fiber in the ply of paper and the distribution of filler, deflection felt side surface promptly,, another side is crushed on the level and smooth hard roller (granite, metallic roll etc.), makes even surface.Therefore, usually final squeezing will improve the flatness on the surface of the side that contacts with level and smooth hard roller side, and utilize when making level and smooth machine calender in its approximate equality ground, two sides and soft press-polishing machine carry out 2 clampings to handle, the difference of above-mentioned surface and the inside is to be held or extended.
Then, after drying machine partly makes paper dryer, in order to improve surface strength of paper, paper powder when preventing to print, generally be that surface conditioning agent is coated on the surface of paper, this surface conditioning agent is as main component with starch, PVA or polyacrylamide etc.; It is with the general applying device that uses in the system paper field, for example a kind of device of from devices such as public size presser, scraper plate metering size press machine, scraper metering size press machine, door roller glue spreader, scraper plate glue spreader, scraper glue spreader, scraper scraper plate glue spreader, air knife glue spreader, selecting for use, it is coated on the body paper surface.
Coating amount when using aforesaid device, coated surfaces finishing agent is that will to apply and make it to be dried to a dry weight on the side be 0.05～1g/m 2
At the coated surfaces finishing agent and after making its drying, as required, on calender, carry out paper injection, squeezing, smoothing and handle and be finish-machined to goods.As at this moment used calender device, the machine calender that normally constitutes by the combination of metallic roll/metallic roll, this device has the tendency of difference in the table of the flatness that operation produced encouraged before the above-mentioned press sections and printing ink inking, is not very desirable device.
Employed calender is so-called soft press-polishing machine among the present invention, it is to be made of metallic roll and resilient roller (generally being with paper calender roll or the roller that covers with the higher resin material of durability such as polyamide-based resin), compare with the fine finishining of the former machine calender that only constitutes by metallic roll, can alleviate inhomogeneous and density unevenness after the press polish that causes is even by the quality of ply of paper, the result can obtain not having the uniform printing surface of the irregular concentration of absorption of inks in hectographic printing, particularly in the more printing of printed color.
So far be extensive use of above-mentioned soft press-polishing machine, but to eliminate usually difference in the table in order handling, same paper is alternately contacted with metallic roll and resilient roller and to carry out the paper injection more than the clamping 2 times by the different roller of these two kinds of material characters of metallic roll and resilient roller.On the other hand, in the present invention, in order to eliminate difference in the table that press sections had produced in the past, and in order to keep loosing character to guarantee opacity, the paper injection that need carry out 1 clamping only.At this moment, make paper with the contacted paper of metallic roll side, corresponding with the final pressure roller in papermaking operation press sections with contacted of felt, the flatness of difference in just not shown thus, good printing ink inking is arranged.Promptly, make soft press-polishing machine have more that the metallic roll of smooth surface is crimped on, the final pressure roller of the relatively poor press sections of flatness contact the paper of side with felt on, just can eliminate difference in the table of flatness and inking thus.
Preferably 87～95 ° of the hardness of the resilient roller of soft press-polishing machine at this moment (Shao Er hardness D:JIS Z2246).When surpassing 95 °, just rare to uniform profile; In the time of discontented 87 °, the durability of resilient roller just worsens, and difficulty presents flatness.And, the preferably discontented 0.5 μ m (Rmax) of the surface roughness of resilient roller (JISB0601), the printing ink inking that at this moment can reduce paper is inhomogeneous.And, preferably metallic roll is heated in order to increase the flatness with the contacted paper of metallic roll.But 40～150 ℃ of the desirable one-tenth of the surface temperature of metallic roll at this moment, temperature is 50～120 ℃ preferably, be preferably under 60～100 ℃ the temperature and handle, like this, even in yet affected multiple colour printing, there is not the uniform printing surface of concentration of difference in obtaining showing to less density irregularity yet.
Tightness in the physical property of the newsprint that preferably obtains like this is 0.55～0.63g/cm 2, Wang Yan formula smoothness (Japan Tappi No.5) is that difference (%) is adjusted to below 20% in 15～100 seconds, the table of smoothness.Here, difference in the table of smoothness (%) is to remove the absolute value of smoothness (second) difference in the table and calculate with the inside smoothness (second), and concrete numerical value can be calculated by following formula.
Difference in the table (%)=[| (smoothness of the smoothness-the inside on surface) |/(smoothness of the inside)] * 100
Wherein, the surface of so-called paper be meant final pressure roller in papermaking operation press sections, with contacted of metallic roll; So-called the inside is meant and contacted of felt.
With chemical pulp (NKP or LKP etc. bleaching or that do not have bleaching), mechanical pulp (GP, CGP, RGP, PGW, TMP etc.), old paper stock (DIP) etc., mixed and as the paper pulp that constitutes body paper with ratio arbitrarily.When papermaking, also can suitably to add white carbon ink non-crystalline silicons such as (white carbon) as required in paper stock be inorganic dyestuff, the kaolin that burns till, structurized kaolin and titanium dioxide, the filler that system paper such as Lauxite are used.
And, in above-mentioned paper stock, can also add cementing agent, water-proofing agent, ultraviolet rays such as (bright) alum, paper power reinforcing agent, yield rate improving agent, fortified rosin cementing agent, emulsion cementing agent with above-mentioned filler and prevent general public paper grade (stock) medicines such as agent, with above-mentioned paper machine papermaking.In the present invention, body paper quantitatively there is no particular limitation, but 30～45g/m normally 2About scope.
The best mode that carries out an invention
Below, exemplify embodiment and specifically describe the present invention.Certainly, the present invention is not limited to these embodiment.And in the example part and % if not making prompting in advance, just represent weight portion and weight % respectively.
(embodiment 1)
(making of body paper)
By the composition of proportions slush pulp of coniferous tree kraft pulp (NKP) 10 weight portions, hot method mechanical pulp (TMP) 40 weight portions, substrate paper pulp (GP) 10 weight portions, news deinked waste paper paper pulp (DIP) 40 weight portions, with refiner freedom (CSF) is pulled an oar, made to this slush pulp is the slush pulp of 120ml.In the slush pulp that makes like this, contrast according to solid content, adding paper pulp rosin latex filler (commodity name: SPN-773/ waste Chuan Huaxuegongyeshe) 0.3%, (bright) alum 1%, average grain diameter respectively is the white carbon ink 1% of 15 μ m, and is mixed and make paper stock.Follow, become the form paper machine to carry out papermaking with the gap, making quantitatively is 40g/m 2Body paper.At this moment squeezing condition is the surface of paper, contact with felt face side in final squeezing and carry out (the inside contacts with flat roll).
(making of newsprint)
With door roller glue spreader, with the hot water heating for dissolving oxidized starch (commodity name: エ-ス prince A/ コ-Application ス -チ society) be coated on the two sides of the above-mentioned body paper that makes, making it be dried to a dry weight on the side is 0.2g/m 2Afterwards, on soft press-polishing machine, carry out the clamping paper injection in contact 1 time, obtain being used for the newsprint of hectographic printing thus with following condition, the surface that makes paper and resilient roller side (the inside and metallic roll side).
80 ℃ of metallic roll surface temperatures
93 ° of resilient roll hardness (commodity name: エ ラ グ ラ ス ZE, Jinyang society system)
Resilient roller surface roughness 0.3 μ m (Rmax)
Clamp pressure 70kg/cm
(embodiment 2)
Except the calender specification among the embodiment 1 is got into the following condition, other all make newsprint similarly to Example 1.
70 ℃ of metallic roll surface temperatures
93 ° of resilient roll hardness
Resilient roller surface roughness 0.45 μ m (Rmax)
Clamp pressure 70kg/cm
(embodiment 3)
Except the calender specification among the embodiment 1 is got into the following condition, other all make newsprint similarly to Example 1.
70 ℃ of metallic roll surface temperatures
89 ° of resilient roll hardness (commodity name: ミ ラ-マ Star Network ス YCR5400, ヤ マ ウ チ system)
Resilient roller surface roughness 0.3 μ m (Rmax)
Clamp pressure 70kg/cm
(embodiment 4)
Except the calender specification among the embodiment 1 is got into the following condition, other all make newsprint similarly to Example 1.
120 ℃ of metallic roll surface temperatures
93 ° of resilient roll hardness
Resilient roller surface roughness 0.3 μ m (Rmax)
Clamp pressure 70kg/cm
(embodiment 5)
Except the calender specification among the embodiment 1 is got into the following condition, other all make newsprint similarly to Example 1.
50 ℃ of metallic roll surface temperatures
93 ° of resilient roll hardness
Resilient roller surface roughness 0.3 μ m (Rmax)
Clamp pressure 70kg/cm
(embodiment 6)
Proportion structure with thermomechanical pulp (TMP) 20 weight portions, newspaper deinked waste paper paper pulp (DIP) 80 weight portions forms slush pulp, and with refiner freedom (CSF) is pulled an oar, made to this slush pulp is the slush pulp of 120ml.In the slush pulp that makes like this, contrast according to solid content, adding paper pulp rosin latex filler (commodity name: SPN-773/ waste Chuan Huaxuegongyeshe) 0.3%, (bright) alum 1%, average grain diameter respectively is the carbon 2% of the light color of 15 μ m, and is mixed and obtain paper stock and carry out papermaking.In addition, all the other all make the newsprint that is used for hectographic printing similarly to Example 1.
(comparative example 1)
1 clamping paper injection of soft press-polishing machine in the alternate embodiment 1, carry out 2 clamping paper injections [promptly, the surface of paper contacted with metallic roll side (the inside and resilient roller side), when the 2nd clamping, make the surface of paper and resilient roller side (the inside and metallic roll side) carry out paper injection in contact].
(comparative example 2)
1 clamping paper injection of soft press-polishing machine in the alternate embodiment 1, carry out 1 clamping of machine calender (promptly, with metallic roll processing, smooth (ス ミ Application グ) 60 ℃ of roll surface temperatures, clamp pressure 70kg/cm) paper injection.
(comparative example 3)
1 clamping paper injection of soft press-polishing machine in the alternate embodiment 1 and carries out [surface of paper is contacted with metallic roll side (the inside and resilient roller side)] paper injection on the contrary in the table described in the embodiment 1.
(comparative example 4)
1 clamping paper injection of soft press-polishing machine in the alternate embodiment 1 carries out 4 clampings of machine calender (promptly, with metallic roll processing, 60 ℃ of smooth roll surface temperatures, clamp pressure 90kg/cm) paper injection and (is to use the multistage clamping, paper is quite done ring; This comparative example is to make difference and inking example good, that still opacity is worsened in the table).
Surface and the inside to the newsprint described in the foregoing description and the comparative example are carried out quality evaluation as described below respectively, and resulting result is illustrated in the table 1.
Smoothness
Measure the paper surface that is used to print and the smoothness (second) of the inside respectively with Wang Yan formula smoothness assay method, obtained difference (%) in the table of smoothness by following formula, from this measured value.With % difference (%) in these tables is illustrated in the table 1.
Difference in the table (%)=[| the smoothness on the smoothness-surface of the inside |/(smoothness of the inside)] * 100
The printing ink inking
Use offset press (little gloomy SYSTEMC-20/ Omori Corp.), carry out judging the printing ink inking of light color portion continuously after 10000 4 kinds of colored printings, by range estimation.In the table 1 zero, △, * marking is the following character of expression.
Zero: image is distinct, the printing ink inking is good, and gradation unequal is even almost not to be had.
△: the printing ink inking worsens slightly, distinctiveness is weaker slightly, and gradation unequal is even less.
*: the more shallow and printing ink inking deterioration of image, gradation unequal is even bigger. The reflectivity of printing surface
Carry out the RI printing with black ink 0.3ml, use the reflectivity (%) of standard colour difference meter (the electric look of color dispersing meter (ス ペ Network ト ロ カ ラ-メ--) SE2000/ Japan), mensuration printing surface.The superficiality of blank sheet of paper (flatness, glossiness) is bigger to the influence of printing surface reflectivity, and the newsprint that this numerical value is little has the adaptability of whole good printing, multicolour printing.
In the table of printing surface reflectivity difference % be with the printing surface reflectivity (%) of the inside remove surface and the inside printing surface reflectivity (%) difference absolute value and calculate, specifically definite by following formula.Using in the table 1 | %| represents difference in the above-mentioned table (%).
Difference in the table (%)=[| the printing surface reflectivity of the printing surface reflectivity-the inside on surface |/(the printing surface reflectivity of the inside)] * 100
Printing back opacity (%)
Use standard colour difference meter (the ス ペ Network ト ロ カ ラ-メ--electric look of SE2000/ Japan), mensuration reflectivity are obtained printing back opacity (%) with following formula from this measured value.This value low (particularly below 85%), ink bleed, permeability are severe more.
Printing back opacity (%)=(the printing the inside reflectivity after the printing)/(the printing the inside reflectivity before the printing) * 100
Table 1
Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Embodiment 5 Embodiment 6 Comparative example 1 Comparative example 2 Comparative example 3 Comparative example 4
Smoothness Second Poor in the table of the inside, surface | %| 31 32 -1 3.1 31 35 -4 11.4 30 32 -2 6.2 30 36 -6 16.6 33 30 3 10 27 29 -2 6.8 37 30 7 23.3 34 28 6 21.4 40 31 9 29.0 28 23 5 21.7
The printing ink inking The inside, surface ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ × × ○ △ △～× △～×
The printing surface reflectivity ％ Poor in the table of the inside, surface | %| 12.58 12.56 0.02 0.1 12.12 11.58 0.54 4.6 11.65 12.32 -0.67 5.4 12.54 10.42 2.12 20.3 11.92 12.76 -0.84 6.5 12.52 12.42 0.1 0.8 10.83 12.39 -1.56 12.5 12.48 13.43 -0.92 7.0 10.81 13.15 -2.34 17.7 13.4 13.13 0.27 2.0
Printing back opacity ％ 88.2 88.1 88.2 87.5 88.4 87.2 87.3 86.6 87.9 83.5
From the result shown in the table 1 as seen, use method of the present invention, promptly, after with raw material papermaking, drying, on soft press-polishing machine, carry out the paper manufacture method that is used for newspaper that paper injection is handled, with the contacted paper of metallic roll side of soft press-polishing machine as on the final pressure roller in papermaking operation press sections, with contacted of felt, and handle with 1 clamping paper injection, difference in the printing ink inking of the paper that is used for newspaper that obtains is not thus shown, can provide the good printed matter of opacity.

Claims (3)

1. the manufacture method of newsprint, be with wood pulp, old paper stock, filler raw material as main component, after with this raw material papermaking, drying, on soft press-polishing machine, carry out the manufacture method of the newsprint of paper injection processing, it is characterized in that, it is that 1 clamping is handled that paper injection is handled, and with the contacted paper of metallic roll side of soft press-polishing machine be contacted of final pressure roller in papermaking operation press sections and felt.
2. the manufacture method of newsprint as claimed in claim 1 is characterized in that, the hardness of the resilient roller of soft press-polishing machine (Shao Er D:JIS Z 2246) is that 87～95 °, surface roughness (Rmax:JIS B0601) are less than 0.5 μ m; And, the temperature of metallic roll is 40～150 ℃.
3. the newsprint made from the described method of claim 1 is characterized in that, the tightness of the newsprint after soft press-polishing machine is handled is 0.55～0.63g/cm 2, Wang Yan formula smoothness (JapanTappi No.5) is that difference is below 20% in 15～100 seconds, the table of smoothness.
CN018159745A 2000-09-21 2001-09-20 Method of mfg. newsprint Expired - Fee Related CN1216204C (en)

Applications Claiming Priority (2)

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JP2000286949A JP3978567B2 (en) 2000-09-21 2000-09-21 Newspaper production method
JP286949/2000 2000-09-21

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CN1216204C CN1216204C (en) 2005-08-24

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KR20030036597A (en) 2003-05-09
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CN1216204C (en) 2005-08-24
WO2002025009A1 (en) 2002-03-28
KR100496053B1 (en) 2005-06-16

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