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
  • D21H19/80—Paper comprising more than one coating
  • D21H19/82—Paper comprising more than one coating superposed
  • D21H19/822—Paper comprising more than one coating superposed two superposed coatings, both being pigmented
• • 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
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
  • Y10T428/259—Silicic material
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31855—Of addition polymer from unsaturated monomers
  • Y10T428/3188—Next to cellulosic
  • Y10T428/31895—Paper or wood
  • Y10T428/31906—Ester, halide or nitrile of addition polymer
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31971—Of carbohydrate
  • Y10T428/31993—Of paper
  • Y10T428/31996—Next to layer of metal salt [e.g., plasterboard, etc.]

Definitions

• the present invention relates to the technical field of stationery and it relates, more particularly, to the production of special papers comprising, on at least one side, a coating intended to give them particular characteristics.
• the invention relates, more particularly, among these so-called special papers, those having a high gloss character and intended to be used for printing, in particular in the advertising field.
• the current trend is to be able to have so-called high-gloss papers, in the sense that they have, on at least one side, a gloss at least equal, or even, preferably, greater than 85%.
• the first known under the name of coating on chrome or "cast coating", consists of scrolling the paper strip to be treated on a chrome cylinder, perfectly polished and heated which it partially surrounds, after having been taken care of by two deflection rollers.
• the paper strip is coated, on its internal face, in particular by injection, with a coating layer or sauce including, in addition to traditional pigments, special binders and adjuvants intended to preserve to the layer a certain malleability during its contact with the chromed cylinder and to facilitate the separation between this last and the layer.
• a coating layer or sauce including, in addition to traditional pigments, special binders and adjuvants intended to preserve to the layer a certain malleability during its contact with the chromed cylinder and to facilitate the separation between this last and the layer.
• the spread sauce is distributed, pressed and heated, between the paper and the chrome cylinder, so as to undergo, simultaneously with its spreading, a kind of calendering and simultaneous drying.
• Suitable results can be obtained with running speeds between 0 and 50 or 100 m / min. This requirement for a limited running speed corresponds to the need to have, beyond the cylinder, a paper which is sufficiently dry for it to be able to be peeled off from the chrome-plated cylinder.
• Such a technique is further penalized by the difficulty of being able to produce a high-gloss paper on two sides. Indeed, during the coating of the second face, the evacuated vapor must, necessarily, pass through the paper and the layer of the first coated face. This vapor, during its evacuation, deteriorates the layer of the first face and does not make it possible to obtain a suitable second face, due to the braking imposed on the evacuation of the vapor by the need to pass through the paper and the first layer filed.
• Such a technique is, moreover, also known for not allowing the coating, under suitable conditions, of a support other than paper and, more particularly, of a support made of plastic, due to the non-permeability of such a material.
• a second technique consists in depositing, by traditional coating, with a trailing blade for example, a sauce on one face of a support by composing the coating sauce so as to include in it a suitable proportion of plastic pigments also called gloss pigments in following this memo and made up of spherical particles whose average diameter is between 0.05 and 1 micrometer and, preferably, close to 0.5 micrometer.
• the coating takes place over a sufficient thickness, generally between 3 and 25 micrometers, so as to be able to have a resistant layer capable of being suitably calendered.
• the first is due to the very high cost that should be agreed for the composition of the coating sauce, because of the high price of the plastic pigments to be incorporated.
• the layer containing a high proportion of plastic pigments generally greater than 30% by weight, if it compacts very easily during calendering, suffers a loss of opacity which is harmful in itself but which results in moreover, by a defect in surface appearance, analogous to the defect in appearance commonly called sealing in the paper industry.
• sealing corresponds to the appearance of a more or less heterogeneous gray tint which comes from a sort of vitrification of the paper.
• Such a drawback is unacceptable for the production of high-gloss white or pastel-colored papers, but also of dark shades.
• the object of the present invention is precisely to overcome this difficulty by proposing a new process for obtaining a high-gloss support, such a support being able to be a paper but also, indifferently, a substrate, such as a strip or a plastic film.
• the method of the invention also makes it possible, if necessary, to treat the two faces of the same substrate, using the same operating phases, possibly offset in time, if a method is considered processing by continuous scrolling.
• the subject of the invention is also, as a new industrial product, a high-gloss support, with a gloss at least equal to 80 or 85%, characterized by the existence of a substrate comprising, on at least one face: - a first layer of a traditional coating sauce deposited at a rate of 3 to 25 g / m2, - at least one superimposed layer, called the upper layer, formed of a sauce deposited at a rate of 1 to 10 g / m2 and based on traditional pigments with a particle size of at least 60% less than 2 micrometers, of at least one binder traditional in sufficient quantity and gloss pigments at a rate of at least 20% by weight of the charge of traditional pigments and corresponding to a particle size between 0.05 and 1 micrometer and, preferably, close to 0.5 micrometer.
• the process for obtaining a high-gloss support according to the invention consists in using a substrate in sheet, film, plate, of relatively thin thickness, generally close to 100 micrometers.
• a substrate is described, preferably in the following, as being a paper of traditional manufacturing, for example with a grammage of 80 g / m2 having possibly undergone a size press treatment during its manufacture.
• the invention applies, under exactly the same conditions, to any substrate of different material and, in particular, to a polyester film.
• the first operational phase of the process consists in depositing, on at least one of the faces of the substrate, a coating sauce, of traditional composition in stationery, at a rate of 3 to 25 g / m2 , more particularly from 8 to 15 g / m2 and, preferably, around 10 g / m2.
• the coated sauce is said to be traditional by its composition, pigments, binders and additives conventionally used.
• a reservation must be made in the sense of the term "traditional", because of the desire to choose, in all cases, a composition that must meet different imperatives to assume the functions assigned to it.
• attachment support by constituting a prelayer for subsequent layers, that of being as white as possible, that of being of low cost and that of having the ability filling in surface differences, usually presented by paper.
• the coating sauce comprises conventional pigments including, preferably, kaolin, pigments corresponding, for at least 60% of them, to a particle size less than 2 micrometers.
• the pigments chosen have, for at least 90% of them, a particle size of less than 2 micrometers.
• composition of the coating sauce also comprises, in a traditional manner, suitable binders so that the layer assumes the above functions, binders among which mention should be made of synthetic latexes, starch, polyvinyl alcohol, proteins.
• the coating sauce is free of gloss pigments.
• This sauce is deposited to form a precoat regularly covering, in a homogeneous and uniform manner, the support face.
• This precoat is deposited, by any suitable means known in the art, for example with a trailing blade.
• the precoat undergoes a natural or forced drying phase, followed, if necessary, by a calendering phase carried out using traditional stationery means but, preferably, at a higher temperature than room temperature to facilitate subsequent production. of shine.
• This temperature can be between ambient and 150 o C, for example between 80 and 100 o C.
• Calendering can be carried out with a pressure of 0 to 300 kg per linear centimeter.
• the method according to this first implementation provides for the deposition of at least one so-called gloss layer, at a rate of 1 to 10 g / m2, preferably at a rate of 3 g / m2.
• the gloss layer is formed from a coating sauce based on traditional pigments, of the type described in relation to the previous precoat.
• the constituent sauce of the so-called gloss layer incorporates, however, gloss pigments at a rate of at least 20% by weight of the charge of traditional pigments incorporated in this gloss layer.
• the gloss pigments are chosen to have a particle size between 0.05 and 1 micrometer and, preferably, close to 0.5 micrometer.
• acrylic styrene copolymers such as, in particular, the product sold under the brand name "Ropaque” by the company ROHM and HAAS or, again, polystyrenes, such as products marketed under the brand name "NYTRON” by the company WILLIAMS.
• the sauce of the gloss layer from traditional pigments of which at least 60% of them, and preferably 90% of them, have a particle size of less than 2 micrometers.
• the gloss layer is deposited by traditional coating method, also preferably with a dragging blade, then undergoes traditional or forced drying followed by conventional calendering at usual temperature. This temperature is preferably as high as possible to improve the gloss, but it should not exceed 105 o C, in order to avoid adhesion of the layer on the rollers of the calender. Calendering is carried out at conventional pressures, for example of the order of 100 to 300 kg per linear centimeter.
• the constitution of an overall layer by proceeding as said above, by depositing a precoat followed by at least one gloss layer, makes it possible to obtain, from a substrate of the type of that specified above, a brightness characteristic close to 85%. This characteristic is obtained without the effect of graying or sealing, by globally involving only a small proportion of plastic pigments of gloss deemed to be of a high cost price.
• Results are obtained by depositing, on the precoat of the type described above, two superimposed layers, called gloss, of similar composition and deposited by coating under the same conditions. In such a case, it is possible to lower the proportion of gloss pigments in each of the layers, while obtaining the desired result. Adequate results have been obtained by providing 15% of gloss pigments for the first superimposed layer and 20% for the second so-called upper layer.
• the gloss layer from 30% by weight of gloss pigments, from 20% by weight of kaolin, of which 98% at least preferably corresponds to a particle size of 2 micrometers, and of pigments and traditional binders in sufficient additional quantity.
• the pre-layer does not contain kaolin
• a first layer is deposited on the substrate intended to assume the function of prelayer and the function of first gloss layer.
• a layer of traditional composition including a proportion of less than 15% by weight is deposited on the substrate, at a rate of 5 to 20 g / m2 and, preferably, 10 g / m2, according to usual conditions.
• gloss pigments and then, after drying and possible calendering, at a rate of approximately 4 g / m2, a second layer including 20% gloss pigments. This second layer is dried and calendered and the substrate thus treated is characterized by a gloss close to 87%.
• a standard paper support consisting, for example, of 50% of long softwood fibers and of 50% of short hardwood fibers and coated with starch in size press during its manufacture and characterized by the following tests: - Weight ; 66.5 g / m2 - Air porosity AFNOR Q 03075 , 2.3 - Cobb bonding (1 min) (side 1 / side 2) AFNOR Q 03014 whi 20/18 - Smooth Bekk (side 1 / side 2) AFNOR Q 03012 7-8 19/21 - Hunterlab sheen (side 1 / side 2) TAPPI T 480 ; 5/5 - CIE Whiteness (side 1 / side 2) GANZ and BRIESSER method 8.1 128/122
• Step 1
• this support was coated on side 1 with a dragging coater with the following coating sauce: - 60 parts by weight (dry / dry) of ground natural calcium carbonate Hydrocarb 90 manufactured by the company OMYA and characterized by a particle size of 90% ⁇ 2 micrometers, - 40 parts by weight (dry / dry) of kaolin HT marketed by the company ENGELHARD, - 10 parts by weight of synthetic latex DL 670 of the DOW CHEMICAL FRANCE, - 0.3 parts by weight (dry / dry) of carboxymethylcellulose of medium viscosity 7 M1 from the company HERCULES, - the necessary amount of water to obtain a preparation with a 65% solids content, - the quantity of ammonia necessary to obtain a pH of 9.5.
• coating sauce - 60 parts by weight (dry / dry) of ground natural calcium carbonate Hydrocarb 90 manufactured by the company OMYA and characterized by a particle size of 90% ⁇ 2 micrometers, - 40 parts by weight (dry
• the layer weight deposited was 12 g / m2 on side 1.
• This paper was coated a second time on the same side 1, with a dragging blade, with a coating formulation of the following composition: - 30 parts by weight (dry / dry) of Ropaque OP 84 synthetic organic pigment from the company ROHM and HAAS, - 70 parts by weight (dry / dry) of fine kaolin (98% ⁇ 2 micrometers) Amazon 88 sold by the company EUROCLAY, - 16 parts by weight (dry / dry) of synthetic latex Acronal 360 D from the company BASF, - 0.5 part by weight (dry / dry) of carboxymethylcellulose 7 M1 from the company HERCULES, - the quantity of water necessary to obtain a preparation with a solids content of 51%, - the necessary amount of ammonia to obtain a pH of 9.5.
• the layer weight deposited was 4.5 g / m2.
• This paper was then calendered under the conditions usually used to obtain ordinary glossy papers (glosses of the order of 65%).
• the paper obtained had the following characteristics - Weight ; 83 g / m2 - Smooth Bekk (side 1) AFNOR Q 0312 ; 1,350 - Hunterlab sheen (side 1) TAPPI T 480 ; 87.5 - CIE Whiteness (face 1) GANZ and BRIESSER method ; 96 - No sealing.
• step 2 the following coating formulation was used: - 50 parts by weight (dry / dry) of Ropaque OP 84 synthetic organic pigment from the company ROHM and HAAS, - 50 parts by weight (dry / dry) of fine kaolin (98% ⁇ 2 micrometers) Amazon 88 sold by the company EUROCLAY, - 16 parts by weight (dry / dry) of synthetic latex Acronal 360 D from the company BASF, - 0.5 part by weight (dry / dry) of carboxymethylcellulose 7 M1 from the company HERCULES, - the quantity of water necessary to obtain a preparation with a solids content of 51%, - the necessary amount of ammonia to obtain a pH of 9.5.
• the layer weight deposited was 4.5 g / m2.
• the paper obtained had the following characteristics: - Weight ; 83 g / m2 - Smooth Bekk (side 1) AFNOR Q 03012 , 1,370 - Hunterlab sheen (side 1) TAPPI T 480 ; 92 - CIE Whiteness (face 1) GANZ and BRIESSER method ; 97 - No sealing.
• Example 3 The paper of Example 3 was made from the same support and with the same first step as that of Examples 1 and 2.
• the paper was coated a second time on the same side 1, with a dragging blade, with a coating formulation of the following composition: - 20 parts by weight (dry / dry) of Ropaque OP 84 synthetic organic pigment from the company ROHM and HAAS, - 80 parts by weight (dry / dry) of fine kaolin (98% ⁇ 2 micrometers) Amazon 88 sold by the company EUROCLAY, - 16 parts by weight (dry / dry) of synthetic latex Acronal 360 D from the company BASF, - 0.5 part by weight (dry / dry) of carboxymethylcellulose 7 M1 from the company HERCULES, - the quantity of water necessary to obtain a preparation with a solids content of 51%, - the necessary amount of ammonia to obtain a pH of 9.5.
• the layer weight deposited was 3 g / m2.
• This paper was coated a third time on the same side and with the same formulation as in step 2.
• the layer weight deposited was 2.5 g / m2.
• the paper obtained had the following characteristics: - Weight dozens 84 g / m2 - Smooth Bekk (side 1) AFNOR Q 03012 , 1,450 - Hunterlab sheen (side 1) TAPPI T 480 ; 86.5 - CIE Whiteness (face 1) GANZ and BRIESSER method 7-8 95 - No sealing.
• Step 1
• this support was coated on side 1 with a "Gate roll” coater with the following coating sauce: - 100 parts by weight (dry / dry) of ground natural calcium carbonate Hydrocarb 90 manufactured by the company OMYA and characterized by a particle size of 90% ⁇ 2 micrometers, - 30 parts by weight (dry / dry) of starch previously cooked under standard conditions, - 0.4 parts by weight (dry / dry) of Leucophor CK optical brightener from the company SANDOZ, - the necessary amount of water to obtain a preparation with a 53.5% solids content.
• a "Gate roll” coater with the following coating sauce: - 100 parts by weight (dry / dry) of ground natural calcium carbonate Hydrocarb 90 manufactured by the company OMYA and characterized by a particle size of 90% ⁇ 2 micrometers, - 30 parts by weight (dry / dry) of starch previously cooked under standard conditions, - 0.4 parts by weight (dry / dry) of Leucophor CK optical brightener from the
• the layer weight deposited was 9 g / m2 on side 1.
• This paper was coated a second time on the same side 1, with a dragging blade, with a coating formulation of the following composition: - 50 parts by weight (dry / dry) of synthetic organic pigment Ropaque OP 84 from The Company ROHM and HAAS, - 50 parts by weight (dry / dry) of kaolin HT marketed by the ENGELHARD Company , - 16 parts by weight (dry / dry) of Baysthal P 1 700 synthetic latex from the company Bayer, - 0.7 parts by weight (dry / dry) of carboxymethylcellulose 7 L2C from the company Hercules, - 0.85 parts by weight (dry / dry) of Leucophor CK optical brightener from the company SANDOZ, - the quantity of water necessary to obtain a preparation with a solids content of 51%, - the necessary amount of ammonia to obtain a pH of 9.5.
• the layer weight deposited was 4.5 g / m2.
• the paper was calendered under the same conditions as for Examples 1, 2 and 3.
• the paper obtained had the following characteristics: - Weight dozens 64 g / m2 - Smooth Bekk (side 1) AFNOR Q 03012 (2017) 1,370 - Hunterlab sheen (side 1) TAPPI T 480 ?? 81 - CIE Whiteness (face 1) GANZ and BRIESSER method ?? 88 - No sealing.
• Step 1
• this support was coated on side 1 with a dragging coater with the following coating sauce: - 50 parts by weight (dry / dry) of ground natural calcium carbonate Hydrocarb 90 manufactured by the company OMYA and characterized by a particle size of 90% ⁇ 2 micrometers, - 40 parts by weight (dry / dry) of kaolin HT marketed by the company ENGELHARD, - 10 parts by weight (dry / dry) of Ropaque OP 84 synthetic organic pigment from the company ROHM and HASS, - 10 parts by weight of synthetic latex DL 670 from the company DOW CHEMICAL FRANCE, - 0.3 parts by weight (dry / dry) of carboxymethylcellulose of medium viscosity 7 M1 from the company HERCULES, - the necessary amount of water to obtain a preparation for 65% solids content, - the quantity of ammonia necessary to obtain a pH of 9.5.
• the layer weight deposited was 12 g / m2 on side 1.
• This paper was coated a second time on the same side 1, with a dragging blade with a coating formulation of the following composition: - 20 parts by weight (dry / dry) of Ropaque OP 84 synthetic organic pigment from the company ROHM and HAAS, - 80 parts by weight (dry / dry) of fine kaolin (98% ⁇ 2 micrometers) Amazon 88 sold by the company EUROCLAY, - 16 parts by weight (dry / dry of Acronal 360 D synthetic latex from BASF, - 0.5 part by weight (dry / dry) of carboxymethylcellulose 7 M1 from the company HERCULES, - the quantity of water necessary to obtain a preparation with a solids content of 51%, - the necessary amount of ammonia to obtain a pH of 9.5.
• the layer weight deposited was 4.5 g / m2.
• This coated paper was then calendered under the conditions usually used to obtain ordinary glossy papers (glosses of the order of 65%).
• the paper obtained had the following characteristics: - Weight ; 83 g / m2 - Smooth Bekk (side 1) AFNOR Q 03012 , 1,750 - Hunterlab sheen (side 1) TAPPI T 480 ; 87 - CIE Whiteness (face 1) GANZ and BRIESSER method 7-8 97 - No sealing.

Landscapes

• Paper (AREA)
• Laminated Bodies (AREA)
• Manufacture Of Macromolecular Shaped Articles (AREA)
• Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
• Ceramic Products (AREA)
• Crystals, And After-Treatments Of Crystals (AREA)

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• 1989
  • 1989-04-10 FR FR8904939A patent/FR2645555B1/fr not_active Expired - Fee Related
• 1990
  • 1990-04-05 US US07/505,024 patent/US5169715A/en not_active Expired - Fee Related
  • 1990-04-06 DK DK90420175.3T patent/DK0395539T3/da active
  • 1990-04-06 ES ES90420175T patent/ES2047890T3/es not_active Expired - Lifetime
  • 1990-04-06 EP EP90420175A patent/EP0395539B1/de not_active Expired - Lifetime
  • 1990-04-06 AT AT90420175T patent/ATE96865T1/de not_active IP Right Cessation
  • 1990-04-06 DE DE90420175T patent/DE69004322T2/de not_active Expired - Fee Related
  • 1990-04-09 FI FI901786A patent/FI95945C/fi not_active IP Right Cessation
  • 1990-04-09 PT PT93701A patent/PT93701B/pt not_active IP Right Cessation
  • 1990-04-09 NO NO901596A patent/NO176527C/no not_active IP Right Cessation
  • 1990-04-09 IE IE127990A patent/IE63967B1/en not_active IP Right Cessation
  • 1990-04-10 JP JP2094887A patent/JPH0314699A/ja active Pending
  • 1990-04-10 CA CA002014319A patent/CA2014319A1/en not_active Abandoned

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