Classifications

• • 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
  • D21H19/385—Oxides, hydroxides or carbonates
• • 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
  • D21H19/50—Proteins
• • 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
  • D21H19/54—Starch
• • 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
  • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • D21H19/58—Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or 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
  • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
  • D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
  • D21H21/52—Additives of definite length or shape

Definitions

• the invention relates to a for printing with coldset offset printing inks suitable, coated roll printing paper according to the generic term of Claim 1.
• the invention further relates to the use of a such paper.
• the print quality improves with increasing smoothness of the print carrier and also the ink consumption has lower, higher smoothness of a paper but generally a lower absorbency, resulting in the The rate at which the color emulsifiers slow down is what again to lubricate on the guide elements of the printing press and Placing in the copy stack leads.
• too high Absorbency increases the penetration of the printing inks into the paper, which leads to poor expression, i.e. bad score and to show through of the printed image on the back.
• Standard newsprint meet the conditions for a sufficiently quick drying of coldset inks, As is well known, the quality of the printed image on newsprint is however limited. Standard newsprint is not coated, so-called natural paper. Its pore volume is therefore not one Coating that prevents the ink emulsifiers from knocking away could hinder.
• EP-A-0 377 983 describes a coated newsprint, the Coldset suitability is to be achieved in that the coating pigment unites contains a certain minimum proportion of acicular pigments and overall has at least a certain oil absorption value. It is not yet known that such paper has found its way onto the market. Acicular pigments such as satin white precipitated Calcium carbonates and delaminated or structured kaolins, as described in the Proposed publication are generally very expensive. Furthermore, due to their structure, they require a high one Binder requirement, which increases the manufacturing costs.
• the invention is based on the object of producing an economically to provide coated web printing paper which is suitable for the Printing with coldset inks is suitable, optically different from the normal Newsprint settles and also with the printing speeds can be processed, as in offset newspaper printing or on the provided machines are common.
• Patent application 196 01 245.7 was for coldset offset printing suitable coated web printing paper essentially by the type of Line composition defined, which in turn led to a certain Water absorption capacity of the paper surface, determined as its surface Surface wettability leads to the suitability for printing in coldset offset seems to be crucial. Another important property for that Coldset suitability is the paper's ink drop behavior.
• the printed paper strip about which one Print speed the surface of the test strip the printing process is no longer withstood.
• the test strip is in a first print run moistened and in a second print run with a constant Print speed printed. Leaves the print image on the test strip recognize whether the surface binding of the paper is under The influence of moisture when printing is sufficient.
• the dynamic serves paper samples by means of ultrasound transmission Penetration measuring device DPM 27 from emco Elektronische Meß- und Steuerungstechnik GmbH in 04347 für, Gorkistrasse 31.
• the test method this is based on the device description and operating instructions of this company as of March 13, 1995.
• the change in the ultrasound transmission value is measured, based on the measured value of the sample at the start of the measurement, which is set equal to 100% over time. It is stated in the respective When the measured value was set as a percentage of 100% Output value.
• this is one dynamic test, in which a curve of the transmission behavior over the Time is applied.
• a prerequisite for the coldset suitability of coated web printing paper is that the contact angle determination with the FIBRO test gives a value of ⁇ 70 ° after 2 seconds. Better results are achieved if the contact angle is ⁇ 55 ° after this time.
• Standard newsprint has, for example, a value of only about 42 ° after 2 seconds.
• Such natural paper has a high wetting behavior, which, however, cannot usually be achieved with coated paper.
• the paper is suitable for coldset if a value of 85-25 % results after 1 sec, but preferably a value in the narrower range of 70-30%.
• the papers according to the invention show in the emco test generally values in the range of 55-30% and in a narrower range Values from 40-30%.
• the parameter of the contact angle determination after the FIBRO test was as Rough classification made the fundamental feature of the claims.
• the ultrasound transmission determination according to the Emco test is concerned is a formally different parameter, however, as far as the here the solution described is practically the same Characterized properties of the paper. There are therefore the claimed Limits for the emco test in exchange of the characteristic of Contact angle determination according to the FIBRO test as the basis of the invention considered.
• the further feature for identifying the paper according to the invention which, however, does not only affect the printability as such in the coldset process but also on the processability of the paper in corresponding printing press types, is its Ink absorption.
• an im Applicant's modified impact test also at Use of the multi-purpose test printing machine, System Dr. Dürner, the Company strigbau Dr.-Ing. Herbert Dürner, Peissenberg, used.
• At the Throw-away test is a test print with a under defined conditions Standard printing ink that is generated after a defined time under pressure is brought into contact with a counter paper. The one on the counter paper printed ink intensity is measured with a densitometer. The following are the densitometer values of the counter pressure 30 sec short information about the test method are in this description as Appendix B attached.
• the ink deflection values of the paper according to the invention should be between 1.1 and 0.25. With values in the narrower range of 0.8 to 0.3, the generally achieved very good results.
• Fine-particle pigments in the line composition accelerate in the general ink drying (shortening of the stroke time, expressed by a lower densitometer value) and the Water intake.
• the specialist therefore has the choice or Mix the pigment grain in hand, both sizes according to the invention influence.
• binders in the line recipe be, for example by adding 0.5 to 1.5% Carboximethyl cellulose (CMC), depending on the composition of the Coating pigment. If the binder is additionally starch, in the range of about 2-6 wt .-% added to delay the ink path impact time, so this also has an influence on the water absorption capacity. To this To obtain, the fineness of the coating pigment must be adjusted if necessary become.
• Another effective way to increase water absorption increase consists in the addition of up to 25 wt .-% of a swellable Pigment, preferably a sodium bentonite for coating pigment.
• the total binder content in the coating color should be 15% by weight on coating pigment, do not exceed.
• the higher values below this Boundaries come into question if in addition to synthetic binders Starch and / or CMC can be used.
• binders are generally used in paper coating, the order of which indicates the decreasing binding effect: plastic dispersions (for example styrene-butadiene, acrylate, styrene-acrylate), polyvinyl alcohol, protein or casein, starch.
• plastic dispersions for example styrene-butadiene, acrylate, styrene-acrylate
• polyvinyl alcohol polyvinyl alcohol
• protein or casein starch.
• the plastic dispersions mentioned are highly active binders, also in combination with PVA.
• PVA polyvinyl alcohol
• protein or casein starch.
• the plastic dispersions mentioned are highly active binders, also in combination with PVA.
• PVA itself is not regarded as a synthetic binder (plastic dispersion).
• the addition of a crosslinking agent may be required for certain binders. If only certain highly active synthetic binders are used in certain applications, the total binder content can be less than 11% by weight,
• PVA In addition to its binding power, PVA also has the property of irreversibly mounting on surfaces which have a relatively inert reactivity, as is the case with the calcium carbonate used in the context of the invention.
• the binder proportions can be as follows: Plastic binder 3 - 10% by weight PVA 0 - 5% by weight protein 0 - 5% by weight Strength 0 - 5% by weight CMC 0-2% by weight
• the proportion of calcium carbonate in the coating pigment should be at least 50% by weight. be. However, higher proportions of at least 70% by weight are preferred. It is quite possible that the entire pigment is made of calcium carbonate consists. However, up to about 20 wt. Aluminum hydroxide and up to max. 50% by weight of kaolin in question, as well Mixtures of these pigments. As mentioned above, the Properties of coating color as well as the finished stroke if desired by adding an amount of a swellable layered silicate to the Coating pigment, especially a sodium bentonite can be positively influenced.
• the percentage of pigment particles should be ⁇ 2 ⁇ m, but not less than 60 or 65% by weight.
• the Fineness is only 60 wt .-% ⁇ 2 microns, can increase the Fineness levels by adding finer blending pigments, for example kaolin or aluminum hydroxide.
• finer blending pigments for example kaolin or aluminum hydroxide.
• the coating colors used can be conventional additives such as bis 1.5% by weight melamine formaldehyde resin as wet strength agent, up to 0.4% Carboxymethyl cellulose (CMC) as a solution, optical brightener and / or Chemicals for pH adjustment, such as containing NaOH.
• CMC Carboxymethyl cellulose
• Ground, natural calcium carbonates are, for example, types C60 HS, C70 and C90 HS from ECC International.
• the quality C60 HS has a proportion of 63 ⁇ 3% by weight ⁇ 2 ⁇ m, maximum 2% by weight> 10 ⁇ m and maximum 0.01% by weight> 45 ⁇ m.
• the quality C90 HS contains 90 ⁇ 3% by weight ⁇ 2 ⁇ m, maximum 1% by weight> 10 ⁇ m and maximum 0.01% by weight> 45 microns. These qualities are called a slurry with a solids content of 78 ⁇ 1% by weight.
• Another manufacturer more suitable Calcium carbonate is the Omya company.
• the coating colors according to the invention are added in an aqueous slurry Solids contents of 30 - 65 wt .-% processed dry mass processed.
• Both scraping order processes and inverted are used as order processes Blade, Jet Flow as well as roller application devices like the Massey-Coater, and also film presses like the Jagenberg film press, the Speedsizer or the Metering Size Press from Beloit in question.
• the paper according to the invention is therefore essentially independent of the type of stroke application process, although one or the other order method under certain conditions can lead to a better result.
• the same Scraper coating processes the paper surface and therefore lead locally line thickness of different thicknesses, while roller stitching devices rather create a uniform stroke, what for Ink path behavior can be positive under certain circumstances.
• Significant can also be a gentle coat drying, so that not undesirable Binder emigration phenomena the desired uniform Deteriorate microcapillarity of the coat application.
• line quantities intended to be dry are applied to the base paper with a mass per unit area of more than 4 g / m 2 and side. Area-based masses of 7-12 g / m 2 and side are preferred, typically about 8 g / m 2 and side.
• the invention is not limited to simply coated papers. It is also applicable to double coated papers. Double strokes are based on a mass per unit area of at least 15 g / m 2 and side, typically 20 g / m 2 and side, the coating slip being distributed approximately evenly between the two coat orders.
• the top coat is obviously decisive for the properties of the paper according to the invention. If, within the scope of this description, there is talk of a stroke application without this being specified, the single stroke application is meant for single-coated papers and, as a rule, the cover stroke for double-coated papers.
• the primer in the double stroke is always expressly designated as such in the context of this description. The primer can have a different composition from the top coat.
• the invention is not based on the use of any particular base paper limited. So both wood-free and wood-containing base papers and those with a significant proportion of processed waste paper fibers Find use.
• a wood-free base paper is suitable its entry for papermaking in dry portions around 78 % Pulp, about 20% mineral filler, divided into 15% Calcium carbonate, 2.5 kaolin and 2.5% talc, about 1% starch and about 1 % contains other aids.
• wood-containing base papers are preferred also contain a proportion of processed waste paper fibers.
• Wood-containing base papers usually also have printing technology Benefits, such as higher opacity.
• the fiber entry for a Raw paper containing wood and waste paper can, for example, refer to dry imaginary total fiber from about 20% pulp, 20% wood pulp and 60% Waste paper stock exist.
• the input can further up to contain about 50% mineral filler, which is about a share of 1/3 corresponds to the composition of the substance. As is well known, this remains The amount of filler in the manufacturing process is not entirely in the paper, but rather partially gets into the process water.
• wood pulp Fibrous component it can be all of these Substances that are commonly used in paper technology under this Expression can be understood, namely, for example, ground wood, thermomechanical Wood pulp (TMP), chemical-thermal-mechanical wood pulp (CTMP) etc.
• TMP thermomechanical Wood pulp
• CMP chemical-thermal-mechanical wood pulp
• the papers according to the invention concerned here which are the aforementioned Have properties, in particular are unsatinated or only very weak Satin papers with Bekk smoothness values between about 10 and 50 Seconds. These are so-called slightly satin or matt qualities.
• a high calendering of the paper according to the invention would be relative due to the low proportion of binder in the line not only for printing suitability reduce the required pick resistance of the surface, it could also reduce the The required microcapillarity is lost, which is required for the drying of the coldset printing inks is required.
• a base paper was produced from the following material input at a machine speed of about 1200 m / min: Stock entry of raw paper groundwood 12.3% cellulose 13.0% wastepaper 40.0% filler 33.0% Highly cationic strength 1.5% retention agents 0.2% 100% Test data of the raw paper area based size 40.3 g / m 2 filler 15.2% Longitudinal breaking load 41.8 N Breaking load across 11.8 N Fiber orientation across along 1: 3.5 brightness 73.5% volume 1.538 cm 3 / g
• the base paper according to Example 1 was coated with a line application of the following composition: coating pigments nat. CaCO 3 , 95% ⁇ 2 ⁇ m 80% Al (OH) 3, 98% ⁇ 2 microns 20% 100% Binders and additives, based on coating pigments Styrene-acrylate binder 10% starch solution 3.0% CMC solution 0.25% Melamine formaldehyde resin 0.8% Optical brighteners 1.3%
• the coating had a mass per unit area of about 8 g / m 2 and side.
• the following measurement data resulted on the finished paper: area based size 56.5 g / m 2 Ash after annealing at 600 ° C 35.3% volume 1.18 cm 3 / g Smoothness according to Bekk's top 22 seconds Smoothness after Bekk bottom 15 seconds FIBRO test contact angle after 2 sec. 58 ° Displacement value at 30 sec. 0.42
• the base paper according to Example 1 was coated with a coating slip of the following composition: coating pigment nat. CaCO 3 , 90% ⁇ 2 ⁇ m 100% Binder and additives, based on coating pigment Butadiene-styrene binder 5.0% PVA solution 3.5% Melamine formaldehyde resin 1.3% Optical brightener 1.3%
• the paper had the following surface properties: FIBRO test contact angle after 2 sec. 45 ° Displacement value after 30 sec. 0.50
• the remaining test data corresponded to the paper according to Example 12.
• the paper this example showed excellent coldset suitability in practical tests on a printing press with an 8-printing unit tower.
• the base paper according to Example 1 was coated with a coating color which differed from the coating color according to Example 3 only in that the coating pigment, instead of using a polyacrylate as a dispersing agent, used to form a cationic dispersing agent containing a high amine content to form a cationic pigment slurry and a cationic plastic binder for the preparation of coating colors has been.
• the base paper according to Example 1 was coated with a coating color of the following composition: nat. CaCO 3 90% ⁇ 2 ⁇ m 80% Kaolin 80% ⁇ 2 ⁇ m 20% 100% Binder and auxiliaries, based on coating pigment Styrene-acrylate binder 9.5% starch solution 7.0% CMC solution 0.25% Melamine formaldehyde resin 0.8% Optical brightener 1.3%
• the paper coated with this coating color had the following Surface data: FIBRO test edge angle after 2 sec. 72 ° Displacement value after 30 sec. 1.11 / 1.19
• test papers according to Examples 3 and 4 were able to Coldset printing machines with 8 printing unit towers with usual Production speeds are processed and resulted in one precise image reproduction with normal ink drying behavior.
• higher whites resulted in one high-contrast printout with the print result of LWC matt qualities was quite comparable.
• a standardized base paper was used for the test papers, as it corresponds to the type according to the exemplary embodiment.
• This paper was coated with various coating colors.
• the spread was 7 g / m 2 and side.
• the finished papers had a smoothness of about 15 sec Bekk on the top and about 12 sec Bekk on the bottom.
• All papers had a rating of "1" both on the determination of the dry pick resistance and on the determination of the wet pick resistance on the top and bottom. In any case, they were therefore suitable for offset.
• the following also shows paper properties separately for the top and bottom of the paper. The relevant measured values are separated by a slash, the value before the slash for the top of the paper and the value behind the slash for the bottom of the paper.
• the base paper was coated with a coating color which had the following essential components: coating color nat.
• CaCO a 60% ⁇ 2 ⁇ m 50% nat.
• CaCO 3 70% ⁇ 2 ⁇ m 50% Plastic binder 0% PVA solution 2.0% Crosslinking agent (MF resin) 1.0% Water retention regulator 0.4%
• the finished paper had the following properties of interest here. paper properties FIBRO test contact angle after 2 sec 64/67 Ink path impact time after 30 sec 0.30 / 0.35% Penetration after the emco test after 1 sec 67/73% Penetration after the emco test after 3 sec 30/35%
• the paper test data show that the goal set by some reduction of the plastic binder and an addition of 1% CMC to the coating color could be achieved. When printing this paper on a machine with satellite printing units there was only a slight color build-up.
• Example 8 had properties similar to the paper of Example 6. It was less for printing on a machine with Suitable for satellite printing units.
• the paper according to Example 9 showed the best results Printability.
• Fibro 1100 DAT is the name for a device from Fibro system ab, Box 9081, S-12609 Sweden, from which a detailed prospectus can be obtained.
• the letters DAT stand for "Dynamic Absorption Tester".
• the device is used for Measurement of the wetting behavior of surfaces, a paper property that is suitable for Further processing processes such as painting, printing etc. are precisely measured and set must become. It works on the principle of contact angle measurement and is based on a method developed by the Swedish Paper Research Institute.
• the device is a medical dosing device and a CCD camera comprises that the drop size can be set between 0.1 and 9.9 ⁇ l and that the change characteristic of the wetting behavior of the on the paper sample stored drop through storable video images with a cycle time of 20 milliseconds can be documented. The time course of the contact angle can are recorded so that the wetting behavior of different paper samples can be easily compared with each other.
• distilled water was used for wetting and wetting determined after 2 seconds.
• the counterpressure test also referred to as the lubrication test or kick-off test
• a defined amount of printing ink is applied to a paper strip, which is then Rolled over in sections with a counter test strip at predetermined intervals becomes.
• the quantities of paint given off on the counter-test strips are determined optically and allow conclusions to be drawn about the color absorption behavior and stacking behavior of the Sample strip.
• test execution Details of the test execution are a detailed description of the multi-purpose test printing machine from Ardbau, Dr.-Ing. Herbert Dürner, Aich 17-23, D-82380 P formulateenberg / Kunststoff, dated September 26, 1972, in particular under Sections 10.5 and 14.2 remove.
• a color range of 0.3 cm 3 a rubbing time of 30 seconds in the inking unit and 30 seconds for the printing form is recommended for coated papers.
• the contact pressure for pressure and counter pressure should be 200 N / cm each, ie 800 N with a printing form width of 4 cm.
• the Away Test Paint No. 52 0068 from the Michael Huber paint factory in Kunststoff is to be used.
• the counter print should be carried out after 30, 60, 120 and 240 sec.
• the recommended print speed is 0.5 m / sec.
• a standard paper called APCO II / II from Scheufelen is used as the test printing paper.

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• Paper (AREA)
• Replacement Of Web Rolls (AREA)
• Color Printing (AREA)
• Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

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• 1996
  • 1996-01-16 DE DE19601245A patent/DE19601245A1/de not_active Withdrawn
• 1997
  • 1997-01-09 NZ NZ314045A patent/NZ314045A/xx not_active IP Right Cessation
  • 1997-01-14 NO NO19970150A patent/NO323580B1/no not_active IP Right Cessation
  • 1997-01-16 AU AU10196/97A patent/AU726536B2/en not_active Ceased
  • 1997-01-16 PT PT97100574T patent/PT785307E/pt unknown
  • 1997-01-16 KR KR1019970001084A patent/KR100489984B1/ko not_active IP Right Cessation
  • 1997-01-16 EP EP97100574A patent/EP0785307B1/de not_active Expired - Lifetime
  • 1997-01-16 JP JP9005809A patent/JPH09291497A/ja active Pending
  • 1997-01-16 DK DK97100574T patent/DK0785307T3/da active
  • 1997-01-16 ES ES97100574T patent/ES2180827T3/es not_active Expired - Lifetime
  • 1997-01-16 AT AT97100574T patent/ATE223986T1/de not_active IP Right Cessation
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