CN1723317A - process for producing super high bulk, light weight coated papers - Google Patents
process for producing super high bulk, light weight coated papers Download PDFInfo
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- CN1723317A CN1723317A CNA2003801042016A CN200380104201A CN1723317A CN 1723317 A CN1723317 A CN 1723317A CN A2003801042016 A CNA2003801042016 A CN A2003801042016A CN 200380104201 A CN200380104201 A CN 200380104201A CN 1723317 A CN1723317 A CN 1723317A
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- 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
-
- 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
- D21H19/00—Coated paper; Coating material
-
- 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
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
-
- 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
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/42—Coatings with pigments characterised by the pigments at least partly organic
-
- 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
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/52—Cellulose; Derivatives thereof
-
- 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
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
- D21H23/34—Knife or blade type coaters
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Abstract
The present invention relates to a process of manufacturing a high bulk, low weight paper product produced by using a high level of groundwood containing sheet, blade coating with specifically formulated coatings then passing the paper web between two extended-nip calenders, one calender for each side of paper. As a result, densification of the resulting coated paper product is reduced, while maintaining stiffness and opacity comparable to heavier weight sheets.
Description
Technical field
The present invention relates to a kind of method of making bulky light weight paper product, this paper product has deflection and the opacity suitable with heavier paper, and this method comprises: use the paper that contains senior ground wood pulp; Be coated with special coatings formulated; Make paper web have the calender that prolongs nip then by two; The corresponding nip of each face of paper.
Background technology
Because postage constantly rolls up, so the light paper that is applicable to magazine is produced sizable demand.Yet, after paper lightens, " transparent " and soft problems such as " senses " can occur, thereby make these lighter paper can not be used for magazine, brochure, annual report, advertising page, direct mail and similar publicity materials basically, especially can not be used for high-quality magazine.
The trial of preparation light weight bulky paper is to utilize the ground wood pulp of higher level and use kaolin and plastic pigment coatings formulated by higher level that paper web is coated with, or use than traditional coating more the coating of bulky be coated with.For example referring to the 6th, 287,424,6,332,953 and 4,749, No. 445 United States Patent (USP)s.The 5th, 283, No. 129 U.S. Patent Publications a kind of high gloss light weight paper, it is with the color compositions coating that contains lamellar clay, calcined clay and titanium dioxide, wherein replaces titanium dioxide with the hollow opaque plastics pigment of about 5 weight portions at most.The 4th, 010, No. 307 U.S. Patent Publications a kind of high gloss coated paper product, it contains the calcium carbonate of 70-95 weight % and the not film forming polymer pigment of particle diameter in the 0.05-0.30 mu m range of 5-30 weight %.
In paper-making process, finishing operation can be press polish and handles, and wherein the nip of paper web by forming between one or more pairs of rollers makes the surface of paper web flatten to form smooth surface thus.Simultaneously, the thickness of paper web reduces, and is compacted.Because bulk and density are inversely proportional to, so if density increases, then the bulk through the finishing paper product descends.Other trials of making light weight (24-40 pound) bulky coated paper are to utilize online hot soft press-polishing machine, online supercalender or off-line supercalender to implement under load that reduces and number of nips.For example referring to: the 5th, 694,837,5,750,259,5,546,856,5,400, No. 707 United States Patent (USP)s, they relate to a kind of equipment of repairing continuous form; The 5th, 163, No. 364 United States Patent (USP)s, it relates to the method for a kind of press polish paper or board web; And the 09/839th, No. 507 U.S. Patent application that relates to bulky paper.Also referring to Wikstrom, " press polish of coated paper and cardboard on the soft nip of prolongation (the Calendering of coated paper andboard in an extended soft nip) " of M., Nordic Pulp ﹠amp; Paper Research J.no.4, P289-298 (1997); People's such as Carlsson " the viscoelasticity character of emulsion binder is to the influence of high temperature press polish behavior in service ", 2002 TAPPI Coating Conference, P-457; People's such as Moreau-Tabiche " Wood containing paper pilot calendering-obtainedresults throughsupercalendering; soft nip calendering; and extended nipconcept ", TAPPI 2000 Coating Conference, P-245.
Yet these utilizations are lower than the trial of the pressure manufacturing light weight bulky paper of traditional supercalender nip, obtain the paper of low-luster basically, far below the glossiness 40 of 75 ° of paper pulp and paper industry technological associations (TAPPI), promptly are lower than 35 usually.This paper than low-luster is difficult to many publication purposes, as requires the magazine of the light weight bulky paper of high gloss and high print gloss.
Therefore, the method that is used to improve the bulk of paper at present comprises the woody body paper that uses higher level, and be coated with the coating of the easily finishing kaolin and the plastic pigment preparation of higher level (promptly with), usefulness has the load of minimizing and the supercalender of nip number carries out press polish then.30 pounds of samples of commercialization the analysis showed that the bulk of this paper is in the scope of 1.7-1.9 mil at present.
Prior art does not instruct a kind of manufacturing to have the method for the bulky light weight coated paper of high-stiffness, opacity and whiteness, and this paper can be used as the offset printing paper of " cheapness ".Therefore, exist to make and to have the higher stiffness that to compare with heavier paper and the strong needs than the light weight paper of opacity.
Summary of the invention
The present invention has satisfied tangible demand in this area, it provides having high-stiffness, opacity and whiteness, can be used as the method for the bulky light weight coated paper of " cheapness " offset printing paper of 30 pounds/3300 square feet of a kind of preparations, this method comprises: use woody fine paper, carry out blade coating, then have the calenders that prolong nip with two and carry out press polish, calender of each face correspondence of paper with the coating of formulated.
Our data show, the commercial paper that the light weight coated paper (LWC) of the super bulky that the inventive method is produced and present bulk are the highest is compared, and bulk has improved maximum 22%.The paper that usefulness of the present invention has a calender press polish that prolongs nip with compare with the like product of supercalender press polish, have higher whiteness and opacity, performance suitable or better printing performance, particularly print gloss.Owing to use two obvious higher bulks with the calender generation that prolongs nip, mainly be because described calender with prolongation nip can keep better bulk, that is to say, under the load that equates, use two calenders to provide than supercalender and the lower nip intensity of hot soft press-polishing machine with prolongation nip.
Therefore, an object of the present invention is to provide a kind of method of making the hectographic printing light weight coated paper of super bulky, it may further comprise the steps:
(a) generate a kind of fiber furnish that comprises mechanical pulp and chemical pulp;
(b) form paper web by described fiber furnish;
(c) from described paper web, remove water;
(d) be coated with coating preparation of the present invention;
(e) make coated paper web by two nips with the calender that prolongs nip, wherein each face of paper is towards a hot-rolling, and handles with one of nip of described calender; Wherein each calendering nip is to be at least the liner collet that 300 felt wrapped roll and width be at least 30mm by a surface temperature to form, and described nip provides the load that is at least 1000 pounds/line inch; And keep paper thickness greater than 75% through the paper of press polish.
Another object of the present invention provides a kind of method of No. 5 hectographic printing light weight coated papers of making 30 pounds/3300 square feet super bulky.
Another object of the present invention provides a kind of batching that comprises at least 40% mechanical pulp, be preferably 60% mechanical pulp, wherein said mechanical pulp partly comprises thermomechanical pulp (TMP) and traditional Stone Ground Wood of mixed in equal amounts, and wherein remaining composition is a kraft pulp.
Another object of the present invention provides a kind of method of making the hectographic printing light weight coated paper of super bulky, wherein is coated with preparation and preferably is coated with knife type coater or metering size press coating machine.
Another object of the present invention provides a kind of method of making the hectographic printing light weight coated paper of super bulky, and wherein said coating preparation contains: (i) hollow plastic pigment; (ii) Kaolin pigments; (iii) Duan Shao kaolinton; (iv) titanium dioxide (TiO
2) pigment; (v) He Cheng emulsion binder; And (vi) He Cheng thickener (or additional adhesive, it comprise carboxymethyl cellulose (CMC) or acrylic or based on the thickener of The combined).
Another object of the present invention provides a kind of coating preparation, the content of wherein said hollow plastic pigment be the pigment total amount at least about 2 weight %, be preferably 3-5 weight %.
Another object of the present invention provides a kind of coating preparation, wherein said Kaolin pigments be the pigment total amount at least about 70 weight %, be preferably 80-100 weight %, it has tiny size distribution, it is characterized in that, at least 85% described particle is less than 2 μ m, at least 50% described particle is less than 0.5 μ m, these data are based on the grain count of using the Sedigraph Particle Size Analyzer to provide, and described Kaolin pigments has the flat form, it is characterized by fine grained and coarse grained form factor all greater than 15, be preferably 20-27.
Another object of the present invention provides a kind of coating preparation, wherein said calcined kaolin be the pigment total amount at least about 5 weight %.
Another object of the present invention provides a kind of coating preparation, wherein said TiO
2For the pigment total amount at least about 2 weight %, be preferably 3-5 weight %.
Another object of the present invention provides a kind of coating preparation, the concentration of wherein said synthetic latex be the pigment total amount at least about 12 weight portions or more.
Another object of the present invention provides a kind of coating preparation, the concentration of wherein said synthetic thickener be the pigment total amount at least about 0.05 weight portion or more.
Another object of the present invention provides a kind of coating preparation, and wherein said coating also can contain winnofil (PCC) or grinding calcium carbonate (GCC).
Another object of the present invention provides a kind of coating, this coating is at least every 2.0 pounds/3300 square feet at each lip-deep coating weight of described paper web, be preferably 2.0-60 pound/3000 square feet, 2.5-5.5 pound/300 square feet more preferably, thereby the moisture of coated paper web before press polish that forms is at least 5.5%, be preferably 6.5-8.0%, more preferably 7.0%.Described coating contains tiny flat Kaolin pigments, emulsion binder and thickener, and the thickness of described coated paper web is greater than 2.6 mils.
Another object of the present invention provides a kind of method of making the hectographic printing light weight coated paper of super bulky, compare with traditional supercalender or hot soft press-polishing machine, it keeps more initial bulk significantly, the press polish step is to use two to have the calender enforcement that prolongs nip, wherein said calender is preferably collet nip (shoe nip) calender (SNC), the width of described collet nip at about 40mm to the scope of about 80mm, calendering temperature is controlled at about 300 °F to about 430 °F, and the load of nip is 1700-2400 pound/line inch.
Another object of the present invention provides a kind of method of making the hectographic printing light weight coated paper of super bulky, wherein said basic weight through the finishing coated paper is 28-38 pound/33 square feet, and present 35% or 75 ° of higher TAPPI glossiness, and the thickness of at least 2.15 mils.
Another object of the present invention provides a kind of method of making the hectographic printing light weight coated paper of super bulky, the thickness of wherein said LWC compares 30 pounds/3300 square feet the high 17-27% of LWC through the supercalender press polish, and has whiteness, opacity and the print gloss of raising.
Another object of the present invention provides a kind of method of making the hectographic printing light weight coated paper of super bulky, No. 5 LWC hectographic printing paper that wherein said calender with the collet that prolongs nip is produced, with respect to its like product with the supercalender press polish, its bulk has improved maximum 22%, and have better whiteness and opacity, and suitable or better printing performance.
Description of drawings
Figure 1 shows that the influence of press polish to thickness character.This figure shows that the paper with the press polish of collet nip calender has obviously higher thickness.
Figure 2 shows that the influence of press polish to whiteness character.This figure shows the sample of repairing in collet nip calender, its whiteness is apparently higher than the sample of repairing in supercalender.
Figure 3 shows that body paper is to the opacity Effect on Performance.
Figure 4 shows that coating is to the glossiness Effect on Performance.
Figure 5 shows that print surface roughness (PPS) performance.This figure shows that the PPS performance not only depends on calendering method, also depends on the type of body paper and coating.
Figure 6 shows that the influence that coating is measured print gloss.
The specific embodiment
The inventive method has been made a kind of relatively more light weight papers product of high bulk that has, and that therefore makes opens density or the compactibility with reduction than ground paper, keep simultaneously with than the suitable higher stiffness of heavy paper and the profitability of opacity.
In the method for the present invention, body paper is made with senior mechanical pulp.This method also comprises a coating preparation that comprises the pigment deposit, and it contains: (i) content is the hollow plastic pigment of pigment total amount at least 2 weight %; (ii) content is the flat of pigment total amount at least 70 weight % or the engineering kaolin of fine particle shape; (iii) content is the TiO of pigment total amount at least 2 weight %
2(iv) content is the calcined clay of pigment total amount at least 10%.Binding agent comprises styrene-butadiene (PSD SB) latex of the double-peak type size distribution that accounts for pigment total amount 14-20 weight portion or with the SB latex of Acronitrile modification.Auxiliary binder comprises CMC, acrylic or based on the thickener of The combined.This coating preparation is coated with knife type coater or metering size press coating machine, and coating weight is in the scope of about 2.5-5.5 pound/3300 square feet.Method of the present invention also comprises a press polish step, and it is to have the calender that prolongs nip with two to implement, the corresponding nip of each face, and wherein the coated face of paper is facing to the hot-rolling of temperature in 320-420 scopes.Linear load is in the scope of about 1400-2600pli.The moisture of paper is controlled at and approximates or greater than 6.5% before press polish.With compare with the like product of supercalender press polish, the paper of gained has better whiteness and opacity.Printing performance, particularly print gloss performance are equivalent to or are better than the like product with the supercalender press polish.
Fiber furnish
LWC paper with the inventive method manufacturing begins with the water base batching with high percentage mechanical pulp, and wherein remaining composition is a kraft pulp.Described mechanical pulp is generally makes an appointment with at least 40%, usually in the scope of 40%-80%, preferably in the scope of 60%-80%.This mechanical pulp partly contains hot machine slurry and traditional Stone Ground Wood of mixed in equal amounts.Residual components is a kraft pulp.Mechanical pulp provides a kind of moulding good body paper.Here used mechanical pulp can comprise Stone Ground Wood (SGW), hot mechanical pulp (TMP) or chemi thermo mechanical slurry (CTMP).The sample batching is: (1) 30%TMP/30%SGW/40% softwood kraft pulp SWK and (2) 60%TMP/10%PGW/30%SWK.SWK is not taken as mechanical pulp.Another example can be 55%-65%CTMP/35%-45%SWK.
Make paper with traditional paper making equipment by above-mentioned batching.Make this paper enter the squeezing stage then, wherein can squeeze traditionally.Make paper web enter drying stage then, be dried to moisture and be lower than 6%, be preferably 4% or lower.On paper machine or leaving the paper machine place, be coated with this paper then with coating preparation of the present invention.
The coating preparation
In the inventive method, before finishing, use the coating preparation.Coating preparation according to the present invention contains: (i) hollow plastic pigment; (ii) Kaolin pigments; (iii) calcine kaolinton; (iv) titanium dioxide (TiO
2); (v) He Cheng emulsion binder; (vi) He Cheng thickener (or additional adhesive, it comprises: carboxy methyl cellulose or acrylic or based on the thickener of The combined).Described coating preparation also can comprise winnofil (PCC) or grinding calcium carbonate (GCC).
The content of hollow plastic pigment is at least 2 weight % of pigment total amount, is preferably about 3-5 weight %.Suitable hollow plastic pigment comprises the 2990 Gilchrist Road by ROHMNOVA, Akron, and Ohio 44305 is at the commercial ROPAQUE HP-1055 that provides
The content of Kaolin pigments be the pigment total amount at least about 70 weight %, be preferably 80-100 weight %, preferably be processed to have tiny particle diameter and very flat form.Kaolin pigments has tiny size distribution, it is characterized in that, at least 85% particle is less than 2 μ m, and at least 50% particle is less than about 0.5 μ m, and these data are based on the grain count with the Sedigraph particle size analyzer.Described kaolin has the flat form, it is characterized by fine grained and coarse grained form factor all greater than 15, is preferably about 20-27.The calculating of form factor is based on Sven Lohmander's " aspect ratio (Aspect Ratios Of Pigment Particles Determined ByDifferent Methods) of the granules of pigments of measuring with distinct methods " Nordic Pulp And Paper Research, Vol.15, No.3/2000, the described method of pg.221.Suitable Kaolin pigments comprises by Imerys, Rt-1, and Dry branch, Georgia 31020 is at the commercial CONTOUR that provides 1500
The calcining kaolinton is at least 5 weight % of pigment total amount.Suitable calcined pigment comprises by Engelhard, 101 WoodAvenue, Iselin, the ANSILEX 93 that New Jersey 08830 provides
TiO
2The content of pigment is at least 2 weight % of pigment total amount, is preferably about 3-5 weight %.Suitable TiO
2The RPS VANTAGE that is provided by Dupont (Du Pont) is provided pigment
The concentration of synthetic emulsion binder be the pigment total amount at least about 12 weight portions or more.Suitable synthetic latex binding agent comprises by BASF, 11501 Steele Creek Road, and Charlotte, North Carolina 28273 is at the commercial STYRONAL that provides 4681
The concentration of synthetic thickener be the pigment total amount at least about 0.05 weight portion or more (or additional adhesive, it comprise carboxy methyl cellulose (CMC) or acrylic or based on the thickener of The combined).Suitable synthetic thickening agent comprises by BASF at the commercial STEROCOLL FD that provides
The coating preparation also can comprise PCC or GCC, and it is by Minerals Technologies, Inc., 9 Highland Avenue, Bethlehem, Pennsylvania 18017 and Omya, 61 Main Street, Proctor, Vermont 05765 provides commercial.
The coating preparation can be prepared by the difference batching is mixed with a pot process jointly, or by first premixed, then various batching combinations is prepared.Usually stir the mixture so that the homogenising of preparing burden.Record under the 100rpm rotating speed with the Brookfield viscosity determinator, the viscosity of gained preparation at about 1000cPs to the scope of about 1500cPs.In use, for example in knife type coater, the ideal solid content of coating preparation is about 53 to about 55 weight %; Yet, because plastic pigment typically adds in the preparation with the form of aqueous liquid dispersion with low solid content, thus the solids content of coating preparation more generally about 49 to the scope of about 51 weight %.Sample coating preparation is:
91％CONTOUR 1500
；
5％RPS VANTAGE
；
4％ROPAQUE HP-1055
；
14 parts of STYRONAL 4681
And
0.7 part STYROCOLL FD
, the solids content of coating is 50%, Brookfield viscosity is 1000cPs.
Described coating preparation should be coated with the weight of about 2.0-6.0 pound/3300 square feet, is preferably 2.5-5.5 pound/3300 square feet.The coating preparation is common, but also nonessential, is coated on the two sides of paper web.Generally speaking, the available the 4th, 250,211 and 4, the scraper coating of any traditional type of describing in 512, No. 279 United States Patent (USP)s and be coated with described coating preparation, and/or with the 5th, 436, the water tank type coating machine of describing in No. 030 United States Patent (USP), and/or the 5th, 112, two knife type coaters of describing in No. 653 United States Patent (USP)s are incorporated the instruction of these patents among the application into as a reference.In addition, the coating preparation can be coated with the metering size press coating machine, as Metso ' sOptisizer.Terminology used here scraping blade or knife type coater unless stated otherwise, are interpreted as the metering-type technology that comprises that other are suitable.The doctor blade of describing in the 4th, 780, No. 336 United States Patent (USP)s is advantageously used in low coating weight is provided.The preferred coating of using knife type coater to be coated with preparation can make the base paper sheet mask that homogeneous thickness is basically arranged.Coating process is preferably implemented with off-line or online mode.Before press polish, the moisture of paper web is preferably 6.5% greater than 5.5%, and more preferably 7.0%.
Prolong the nip calender
Coated paper can be had the calender that prolongs nip with two then and carry out press polish, preferably use collet nip calender (SNC), it comprises a hot-rolling and a soft collet support, as the 6th, 332,953,6,465,074 and 6,213, No. 009 United States Patent (USP) is described, incorporates the content of its instruction into the application as a reference here.In this kind calender, described nip is to form between a cylindrical press roll and an arc squeezing collet.The latter has a cylindrical concave, and its radius of curvature and described cylindrical press roll are approaching.When make roller and collet physically mutually near the time, then form nip, long five to ten times of nip that this nip forms between comparable two pressure roller of the length of machine direction.This has increased the time of staying of so-called cellulosic fibrous web in long nip press, can make the squeeze pressure of going up per square inch remain on proper level simultaneously.Compare with hot soft press-polishing machine with traditional supercalender, use collet nip calender can keep obviously bigger original bulk.
Make coated paper pass through two calendering nips, each of paper is facing to a hot-rolling, and handles with one of described calender nip; Each calendering nip is to be at least the support collet that 300 calender roller and width be at least 30mm by a surface temperature to form, and described nip provides the load of at least 1000 pounds/line inch; Keep thickness through the paper of press polish greater than 75%.
Compare with traditional coated paper of identical weight, the gained coated paper has following feature usually:
(1) whiteness improves maximum 4.0%;
(2) opacity improves maximum 3.3%;
(3) thickness improves maximum 22%;
(4) glossiness of paper reduces 1%-7%, but print gloss quite or improve 2%-5%;
(5) surface is coarse slightly, and promptly the PPS that records under the 10kg clamping pressure is 1.6-2.6 μ m (PPS of the commercially available product that obtains with following coating A or B is 1.6-1.9 μ m);
(6) for the roller of same diameter, the weight of every roller is lighter, shows that the bulk of paper is higher.
Embodiment
Body paper
Use five kinds of 32g/m of body paper check of following type
2The high machinery of the effect of body paper: B1, B1/, B4 and two kinds of body paper (being the high machinery of pre-press polish of B1/ and B1//pre-press polish) through the soft pre-press polish of heat.The performance of the high machinery of B1 and B1/ is listed in the table 1.B4 body paper and B1 body paper are similar, have just added less wet end starch in the paper of B4.The body paper of pre-press polish has more smooth surface than the body paper of non-pre-press polish, but its thickness reduces.Table 1 shows, by the content of TMP is increased to 60% from 30%, the content of total mechanical pulp is increased to 70% from 60%, still makes paper keep good processing behavior in service simultaneously.Table 2 shows, by the amount of mechanical pulp is increased to 70% from 60%, thickness is increased to 3.03 from 2.85, and roughness and porosity increase slightly simultaneously.
The coating preparation
" contrast " coating is typical No. 5 light paints, and it contains: 79% standard flakey kaolin, and wherein 80% particle is 0.75 μ m less than 2 μ m and average grain diameter, these data are to measure with the Sedigraph Particle Size Analyzer; 7% whiteness is 93% calcined kaolin; 7.5% TiO
26.5% hollow plastic pigment; 8 parts of starch; And 12 parts of solids coatings are 50.7% styrene-butadiene (SB) latex.
Coating A comprises 86% tiny flat kaolin, and wherein 90% particle is 0.5 μ m less than 2 μ m and average grain diameter, and these data are to measure with the Sedigraph Particle Size Analyzer; 5.5% hollow plastic pigment; 14 parts of styrene-butadiene latexes (SBAn) that contain acrylonitrile (acronitrile) monomer; And 0.25 part of solids content is 53.9% synthetic thickening agent.
Coating B comprises 76% coarse flat flakey kaolin, and wherein 60% particle is 1.6 μ m less than 2 μ m and average grain diameter; 10% whiteness is 93% calcined kaolin; 8.5% TiO
25.5% hollow plastic pigment; 12 parts of SBAn latexes; And 0.25 part of solids content is 51.1% synthetic thickening agent.
Coating C comprises 86% tiny engineering kaolin, and wherein 99% particle is 0.21 μ m less than 2 μ m and average grain diameter; 8.5% TiO
25.5% hollow plastic pigment; 16 parts of SBAn latexes; And 0.25 part of solids content is 55.6% synthetic thickening agent.
Coating process
Use short resident knife type coater, the described coating of following table 3 is coated on the body paper described in table 1 and the table 2.The coating weight of paper reverse side is 5.7g/m
2, the coating weight in paper front is 4.9g/m
2The coating reverse side then is coated with positive earlier.The B4 body paper is coated with 3700fpm, and other body paper is coated with 2100fpm.The moisture of final coating paper is controlled in 5.5-6.0%.
Table 1 body paper character
| The B1 standard | The high machinery of B1/ | |
| | 40 brown paper, 30TMP, | 30 brown paper, 60TMP, 10GWD |
| Other batchings | The waste paper that the waste paper 5 of 18 coatings returns | The waste paper that the waste paper 5 of 5 coatings returns |
| Bodystock paper ash (%) | 5.7 | 3.1 |
| Porosity (s) | 21 | 23.7 |
| Smoothness (SU) front/reverse side | 235/292 | 245/299 |
| Constitute | 29.9 | 31.3 |
| Opacity (%) | 75.8 | 75.2 |
The comparison of table 2 body paper
| Body paper | Thickness (mil) | Gurley porosity (s) Mean/S.D. | The PPS10kg reverse side | The PPS10kg front |
| B1 | 2.85 | 20.2/3.1 | 8.11 | 6.26 |
| The pre-press polish of B1/ * | 2.19 | 25.8/2.6 | 4.89 | 3.84 |
| B4 | 2.50 | 22.9/2.9 | 5.56 | 5.63 |
| The high machinery of B1/ | 3.03 | 25.5/2.8 | 8.52 | 6.56 |
| The high machinery of B1//pre-press polish * | 2.46 | 27/2.5 | 6.05 | 4.86 |
*Every is used a nip to implement the soft pre-press polish of heat under 350 and 15psi
Table 3 coating preparation
| Contrast (scraper) | A (scraper) | B (scraper) | C (scraper) | |
| The standard flakey | 79 | |||
| Tiny flat | 86 | |||
| Coarse flat | 76 | |||
| Tiny processing | 86 | |||
| Ansilex 93 | 7 | 10 | ||
| TiO 2 | 7.5 | 8.5 | 8.5 | 8.5 |
| Ropaque 1055 | 6.5 | 5.5 | 5.5 | 5.5 |
| The SB latex | 12.5 | |||
| The SBAn latex | 14 | 12 | 16 | |
| Starch | 8 | |||
| No. 1 thickener | 0.05 | 0.05 | 0.05 | |
| No. 2 thickeners | 0.2 | 0.2 | 0.2 | |
| Coating solid (%) | 50.7 | 53.9 | 51.1 | 55.6 |
Calendering method
The Optidwell collet nip calender made from Metso Paper Inc carries out press polish with 3000fpm to last coated paper.Burnishing process is implemented with every nip, first press polish reverse side, press polish front again.The heat roller temperature of first nip is 350 °F, and nip width is 70mm; The temperature of second nip is 400 °F, nip width 70mm.The load of first and second nips is 2300pli.
In addition, the paper that is coated with " contrast " coating also carries out press polish with traditional supercalender with 1000fpm.The roll temperature of supercalender is 190 °F, and the load of nip is adjusted to and makes B1 body paper sample can obtain 45% sheet gloss.Same supercalendering condition also is used for the B4 body paper that " contrast " coating is coated with.
The character of coated paper
The character of all coating paper is shown in Fig. 1-6.Printing performance uses the hectographic printing of the assorted colour paper width of cloth at Rochester Institute of technology (RIT), Rochester, and NY assesses.Several 30 pounds commercial products also prints with as a comparison at RIT.Typical 32 pounds of character to 40 pounds of LWC paper, or industrial average properties also gathers and comprises in the drawings with as a comparison.Thickness (Fig. 1)
Sample is with B1 and the manufacturing of B4 body paper, is coated with " contrast " coating, and press polish in supercalender, its thickness is the 1.80-1.83 mil, and consistent with the commercial product that is coated with identical body paper manufacturing and with " contrast " coating.Same sample is to carry out press polish in collet nip calender, and its thickness obviously higher (2.18-2.20 mil) improves 22% approximately.30 pounds of SNC coated paper samples with the high mechanical body paper preparation of B1/ have the thickest thickness, are equivalent to or slightly are better than typical 40 pounds of LWC products.30 pounds of SNC coated paper sample thickness with pre-calendered paper preparation are lower than its not like product of press polish, but still in the scope of typical 36-38 pound LWC product.Thickness and typical 40 pounds of LWC paper with 30 pounds of SNC coated sample of B1 body paper preparation are close.A little less than sample, but be comparable to typical 38 pounds of LWC paper with the thickness of 30 pounds of SNC coated sample of B4 body paper preparation with the preparation of B1 body paper.
Compare with the sample that is coated with coating A or coating C, have the thickness of raising with the sample of the coating B coating that contains coarse flat kaolin and calcined kaolin.In a word, no matter whether use the body paper manufacturing of pre-press polish, 30 pounds of SNC paper have the thickness of obvious increase, that is to say, compare with supercalendered like product (30 pounds), and its thickness has improved 17-27%.As shown in Figure 1, the main cause of the thickness that obviously increases is that collet (shoe) calender can keep good bulk.Therefore, improve the initial bulk of paper, use the collet calender can produce the highest final thickness simultaneously.
In a word, Fig. 1 shows, with the press polish of collet nip calender and with the sample thickness that " contrast " coating is coated with, increases about 22% than its supercalendered like product.With press polish of collet nip calender and the sample thickness that is coated with " contrast " coating A, B or C, than with make comparisons, have that the most commercial paper 30#Mainebulk of high thickness increases about 12-22% (thickness is the 2.12-2.32 mil).The coating preparation is less relatively to the influence of bulk, and only the sample with coating B coating has slightly high bulk.Major requirement influences bulk with body paper, that is to say, with the lower thickness of body paper generation of pre-press polish, and produces higher bulk with the higher body paper of content of mechanical pulp.In a word, obtaining the highest bulk with the high mechanical body paper of B1/, next is B1 body paper, B4 body paper, the high machinery of B1//pre-press polish body paper, is the pre-press polish body paper of B1/ then.Whiteness (Fig. 2)
The whiteness that the higher thickness of non-press polish body paper produces is higher than the body paper of pre-press polish.When the sample of relatively using " contrast " coating to be coated with, the sample of repairing in SNC has higher whiteness with comparing with the sample of supercalender press polish.This is because the obvious less number of nips of more weak relatively pressure and collet nip calender.Sample with coating A or coating B coating has similar whiteness performance, and its whiteness is higher than the sample with coating C coating.Generally speaking, the whiteness of SNC sample is in the scope of 72.7-74.5%, apparently higher than commercial sample (30 pounds) and industrial sample (32-40 pound).
In a word, Fig. 2 shows, with the paper of the collet calender press polish of " contrast " coating coating with compare about 1.1-3.1 percentage point of its whiteness height with the like product of supercalender press polish.If replace " contrast " coating, then the high 0.2-0.6 of whiteness percentage point with coating A.Sample with coating B coating has commeasurable whiteness.Whiteness with the sample of coating C coating reduces 0.3-0.5 percentage point.Improving the content of mechanical pulp in body paper can make whiteness reduce.The whiteness of pre-press polish body paper is comparable to or slightly is better than the like product of its non-pre-press polish.In a word, has good whiteness with the body paper of the pre-press polish of B1, B1/ or the high machinery of B1//pre-press polish, the sample that also is coated with coating A or coating B.
Opacity (Fig. 3)
Similar to the whiteness performance, opacity also highly depends on the type of body paper.Body paper (B1 and B4), the particularly higher body paper of content of mechanical pulp with not press polish produce higher opacity.Sample with coating A or coating B (all containing flat kaolin) coating has similar opacity, and its opacity all is higher than with the sample of coating C coating or the sample that is coated with " contrast " coating.Remove the sample of using coating C coating and making with the B4 body paper, the opacity of SNC sample is apparently higher than commercial sample (30 pounds) and industrial sample (32-40 pound).
In a word, Fig. 3 shows, with the press polish of collet calender and with the opacity of the paper of " contrast " coating coating than with about 2.0-2.5 percentage point of the like product height of supercalender press polish.Replace " contrast " coating with coating A or coating B, the opacity of (body paper that comprises the pre-press polish of B1, B1/, the high machinery of B1/ and B1/ height machinery/pre-press polish) generation is than high about 1 percentage point of the sample of using coating C coating on body paper, and the opacity of its generation is hanged down about 1 percentage point.The opacity that the body paper of pre-press polish produces is hanged down 0.1-0.8 percentage point than the like product of non-pre-press polish.In a word, having the highest opacity with coating A coating and with the sample of the high mechanical body paper manufacturing of B1/, next is with coating A or coating B coating and with the sample of the body paper manufacturing of the pre-press polish of B1, B1/ or the high machinery of B1//press polish in advance.
75 ° of TAPPI sheet gloss (Fig. 4)
Glossiness with " contrast " coating coating and the sample repaired in SNC is starkly lower than the sample of repairing in supercalender.In fact, the SNC sample only has the glossiness of 31-33%, is starkly lower than 30 pounds commercial sample.In addition, the glossiness performance of amyloid " contrast " coating is worse than not amyloid coating A, B and C.The sample that can reach 40% glossiness only is the sample with coating A or coating C coating.Generally speaking, have smooth surface more and more the B4 body paper of low porosity and the body paper of pre-press polish, provide the sheet gloss of raising.Has the highest glossiness (50%) with B4 body paper preparation and the sample that is coated with coating C.
In a word, Fig. 4 shows, hangs down about 15-20 percentage point with the coating of " contrast " coating and with the glossiness of the paper of collet calender press polish than the like product of using the supercalender press polish.Replace " contrast " coating with coating A, the sheet gloss of generation increases about 9-12 percentage point; Replace with coating B, the sheet gloss of generation increases about 2-5 percentage point; Replace with coating C, the sheet gloss of generation increases about 12-17 percentage point.The sheet gloss of implementing pre-press polish generation improves 2-5 percentage point.In a word, be higher than paper with coating A coating with the glossiness of the paper of coating C coating, the paper that is coated with coating B has minimum sheet gloss.
Surface smoothness (Fig. 5) with the print surface roughness concentration
With the sample that " contrast " coating is coated with and repairs in SNC, compare with the sample of in supercalender, repairing, have relatively poor print surface roughness (PPS), or more coarse surface.Described PPS performance not only depends on calendering method, and depends on the kind of body paper and coating.For example, the PPS such as the more coarse body paper of B1 body paper is poorer than the level and smooth body paper such as the B4 body paper.For the same reason, compare with press polish body paper not, the pre-burnishing process that is used for improving the body paper smoothness also makes PPS improve.Contain the kaolinic coating C that PPS that kaolinic coating A of flat and B obtain is better than containing tiny processing.Therefore, the PPS of SNC sample is poorer than commercial sample (30 pounds) and common production piece (32-40 pound).
In a word, Fig. 5 shows, with the coating of " contrast " coating and with the PPS of the paper of collet nip calender press polish than about 0.1-0.9 percentage point of the like product height of using the supercalender press polish.Replace " contrast " coating with coating A, make PPS reduce about 0.1-0.6 percentage point.Replace with coating B, make PPS reduce about 0.1-0.4 percentage point.The PPS that replaces " contrast " coating to provide with coating C improves 0.2-0.3 percentage point.Pre-burnishing process makes PPS reduce 0.1-0.5 percentage point.In a word, the body paper of useful coating A or coating B coating provide commercially available PPS, i.e. 1.6-1.9 μ m.
Print gloss (Fig. 6)
Print gloss is to measure in four look black regions with RIT paper web hectographic printing signal.Find when comparing that higher than the print gloss of SNC sample with the sample of supercalender press polish, this mainly is owing to the sample with the supercalender press polish has higher sheet gloss with the sample that is coated with " contrast " coating.Print gloss performance and paper luminosity are similar, also depend on the smoothness and the porosity of body paper, that is to say, the body paper surface of B4 and pre-press polish is level and smooth more, porosity is low more, and then print gloss is high more.Coating A, B compare with " contrast " coating with C, provide more excellent print gloss.The SNC sample demonstrates the print gloss that is equivalent to or is better than 30 pounds of commercial paper usually.In all SNC samples, has the highest print gloss with B4 body paper preparation and the sample that is coated with coating A.
In a word, with " contrast " coating coating and with the print gloss of the paper of collet nip calender press polish, than low about 7 percentage points of the like product of usefulness supercalender press polish.Replace " contrast " coating with coating A, the print gloss that provides improves 10-12 percentage point; Replace with coating B, can improve 4-8 percentage point; Replace with coating C, can improve 4-10 percentage point.Pre-burnishing process makes print gloss improve 1-5 percentage point.In a word, can compare with commercial paper at least with coating A, B or C coating and with the print gloss of the paper of collet calender press polish.
Though with reference to preferred specific embodiments, it should constitute on schematic and unrestricted meaning in the description of the invention.Those skilled in the art can make a large amount of modifications according to content disclosed by the invention.For example, can use different latexes and pigment.All such changes and modifications are all within scope spirit of the present invention.
Claims (22)
1, a kind of method of making light weight bulky coated paper, it may further comprise the steps:
(a) generate a kind of fiber furnish that comprises mechanical pulp and chemical pulp;
(b) form paper web by described fiber furnish;
(c) from described paper web, remove water;
(d) coating weight of a kind of coating with at least 2.0 pounds in every face/3300 square feet is coated on each surface of described paper web, thus form moisture greater than 5.5% and thickness greater than the coated paper web of 2.6 mils;
(e) make this coated paper web have the calenders that prolong nip by two, each face of paper is towards a hot-rolling, and handles with one of nip of described calender; Wherein each calendering nip is to be at least the liner collet that 300 felt wrapped roll and width be at least 30mm by a surface temperature to form, and described nip provides the load that is at least 1000 pounds/line inch; And keep thickness greater than 75% through the paper of press polish.
2, method as claimed in claim 1, wherein said paper are No. 5 hectographic printing light weight coated papers.
3, method as claimed in claim 1, wherein said batching comprises at least 40% mechanical pulp.
4, method as claimed in claim 3, wherein said batching comprises the mechanical pulp of about 60-80%.
5, method as claimed in claim 1, the coating weight of wherein said coating are every 2.0-6.0 pound/3300 square feet.
6, method as claimed in claim 1, the moisture of wherein said coated paper web is greater than 6.5%.
7, method as claimed in claim 1, the moisture of wherein said coated paper web is greater than 7.0%.
8, method as claimed in claim 1, wherein said coating comprises: hollow plastic pigment; Kaolin pigments; The calcining kaolinton; TiO 2 pigment; The synthetic latex binding agent; And synthetic thickening agent, or additional adhesive, it comprises carboxy methyl cellulose or acrylic or based on the thickener of The combined.
9, method as claimed in claim 8, wherein said coating also comprises winnofil or grinding calcium carbonate.
10, method as claimed in claim 8, the content of wherein said hollow plastic pigment be the pigment total amount at least about 2 weight %.
11, method as claimed in claim 8, the content of wherein said hollow plastic pigment are about 3-5 weight % of pigment total amount.
12, method as claimed in claim 8, wherein said Kaolin pigments has tiny size distribution, it is characterized in that, at least 85% described particle is less than 2 μ m, at least 50% described particle is less than 0.5 μ m, and these data are based on the grain count of using the Sedigraph particle size analyzer.
13, method as claimed in claim 8, wherein said Kaolin pigments has the flat form, it is characterized by fine grained and coarse grained form factor all greater than 15.
14, method as claimed in claim 8, wherein said Kaolin pigments has the flat form, it is characterized by fine grained and coarse grained form factor is about 20-27.
15, method as claimed in claim 8, the content of wherein said Kaolin pigments are at least 70 weight % of pigment total amount.
16, method as claimed in claim 8, the content of wherein said Kaolin pigments are the 80-100 weight % of pigment total amount.
17, method as claimed in claim 8, the content of wherein said titanium dioxide is at least about 2%.
18, as the method for claim 11, the content of wherein said titanium dioxide is about 3-5%.
19, method as claimed in claim 1, wherein said coating preferably are coated with knife type coater or metering size press coating machine.
20, method as claimed in claim 1, wherein said calender are collet nip calenders, and the width of described collet nip is in the scope of the about 80mm of about 40mm-, and calendering temperature is at least 300 °F, and nip load is 1700-2400 pound/line inch.
21, method as claimed in claim 1, wherein said calendered paper have the basic weight, 35% or the thickness of higher 75 ° of TAPPI glossiness and at least 2.15 mils of 28-38 pound/3300 square inch.
22, a kind of method of making the hectographic printing light weight coated paper of super bulky, it comprises:
(a) generate a kind of fiber furnish that comprises at least 40% mechanical pulp;
(b) form paper web by described fiber furnish;
(c) from described paper web, remove water;
(d) use knife type coater to be coated on each surface of described paper web, be at least 5.5% coated paper web thereby form moisture with the coating weight of at least 2.0 pounds in every face/3300 square feet;
(e) make this coated paper web have the calenders that prolong nip by two, each face of paper is towards a hot-rolling, and handles with one of nip of described calender; Wherein each calendering nip is to be at least the liner collet nip that 300 felt wrapped roll and width be at least 30mm by a surface temperature to form, described nip provides the load that is at least 1000 pounds/line inch, and keeps thickness greater than 75% through the paper of press polish;
Wherein said coating contains:
(i) content is the hollow plastic pigment at least about 2 weight % of pigment total amount;
(ii) content is the Kaolin pigments at least about 70 weight % of pigment total amount, described Kaolin pigments has tiny size distribution, it is characterized in that, at least 85% described particle is less than 2 μ m, at least 50% described particle is less than 0.5 μ m, and have the flat form, and it is characterized by fine grained and coarse grained form factor all greater than 15, be preferably 20-27;
(iii) content is the titanium dioxide at least about 2 weight % of pigment total amount;
(iv) content is the calcined kaolin of at least 5 weight % of pigment total amount;
(v) concentration be the pigment total amount at least about 12 weight portions or more synthetic latex;
(vi) concentration be the pigment total amount at least about 0.05 weight portion or more synthetic thickening agent;
Wherein, the basic weight, 35% or the thickness of higher 75 ° of TAPPI glossiness and at least 2.15 mils that has 28-38 pound/33 square feet through the coated paper of finishing, with respect to 30 pounds/3300 square feet LWC with the supercalender press polish, its thickness improves 17-27%, bulk improves maximum 22%, and has whiteness, opacity and the print gloss of raising.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| US42918002P | 2002-11-26 | 2002-11-26 | |
| US60/429,180 | 2002-11-26 |
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| CN1723317A true CN1723317A (en) | 2006-01-18 |
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| CNA2003801042016A Pending CN1723317A (en) | 2002-11-26 | 2003-11-25 | process for producing super high bulk, light weight coated papers |
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| US (1) | US20040099391A1 (en) |
| EP (1) | EP1565614B1 (en) |
| JP (1) | JP2006507420A (en) |
| KR (1) | KR20050086818A (en) |
| CN (1) | CN1723317A (en) |
| AT (1) | ATE366338T1 (en) |
| AU (1) | AU2003302443A1 (en) |
| CA (1) | CA2503966C (en) |
| DE (1) | DE60314771T2 (en) |
| WO (1) | WO2004048692A2 (en) |
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| CN102362031A (en) * | 2009-02-10 | 2012-02-22 | 鲍吉肥料公司 | Use of aluminum phosphate, polyphosphate and metaphosphate particles in paper coating applications |
| CN107245903A (en) * | 2017-07-04 | 2017-10-13 | 吉林化工学院 | A kind of preparation method of inexpensive logistics waybill |
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- 2003-07-10 US US10/618,053 patent/US20040099391A1/en not_active Abandoned
- 2003-11-25 DE DE60314771T patent/DE60314771T2/en not_active Expired - Lifetime
- 2003-11-25 CN CNA2003801042016A patent/CN1723317A/en active Pending
- 2003-11-25 WO PCT/IB2003/005385 patent/WO2004048692A2/en active IP Right Grant
- 2003-11-25 KR KR1020057009425A patent/KR20050086818A/en not_active Application Discontinuation
- 2003-11-25 AT AT03811840T patent/ATE366338T1/en active
- 2003-11-25 JP JP2004554833A patent/JP2006507420A/en active Pending
- 2003-11-25 AU AU2003302443A patent/AU2003302443A1/en not_active Abandoned
- 2003-11-25 EP EP03811840A patent/EP1565614B1/en not_active Expired - Lifetime
- 2003-11-25 CA CA2503966A patent/CA2503966C/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102362031A (en) * | 2009-02-10 | 2012-02-22 | 鲍吉肥料公司 | Use of aluminum phosphate, polyphosphate and metaphosphate particles in paper coating applications |
| CN106567277A (en) * | 2009-02-10 | 2017-04-19 | 鲍吉肥料公司 | Use of aluminum phosphate, polyphosphate and metaphosphate particles in paper coating applications |
| CN106638130A (en) * | 2009-02-10 | 2017-05-10 | 鲍吉肥料公司 | Use of aluminum phosphate, polyphosphate and metaphosphate particles in paper coating applications |
| CN107245903A (en) * | 2017-07-04 | 2017-10-13 | 吉林化工学院 | A kind of preparation method of inexpensive logistics waybill |
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| JP2006507420A (en) | 2006-03-02 |
| AU2003302443A8 (en) | 2004-06-18 |
| EP1565614A2 (en) | 2005-08-24 |
| CA2503966C (en) | 2011-10-18 |
| AU2003302443A1 (en) | 2004-06-18 |
| WO2004048692A2 (en) | 2004-06-10 |
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| EP1565614B1 (en) | 2007-07-04 |
| KR20050086818A (en) | 2005-08-30 |
| CA2503966A1 (en) | 2004-06-10 |
| DE60314771T2 (en) | 2008-03-06 |
| DE60314771D1 (en) | 2007-08-16 |
| US20040099391A1 (en) | 2004-05-27 |
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