US2419207A - Method of production of coated board and paper - Google Patents

Method of production of coated board and paper Download PDF

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Publication number
US2419207A
US2419207A US501320A US50132043A US2419207A US 2419207 A US2419207 A US 2419207A US 501320 A US501320 A US 501320A US 50132043 A US50132043 A US 50132043A US 2419207 A US2419207 A US 2419207A
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Prior art keywords
coating
paper
board
web
water
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US501320A
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English (en)
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Harry C Fisher
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Consolidated Water Power and Paper Co
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Consolidated Water Power and Paper Co
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Priority to BE471279D priority Critical patent/BE471279A/xx
Priority to NL68929D priority patent/NL68929C/xx
Application filed by Consolidated Water Power and Paper Co filed Critical Consolidated Water Power and Paper Co
Priority to US501320A priority patent/US2419207A/en
Priority to FR941399D priority patent/FR941399A/fr
Application granted granted Critical
Publication of US2419207A publication Critical patent/US2419207A/en
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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
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • D21H19/828—Paper comprising more than one coating superposed two superposed coatings, the first applied being non-pigmented and the second applied being pigmented
    • 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
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
    • Y10T428/24372—Particulate matter
    • Y10T428/24421—Silicon containing
    • Y10T428/2443—Sand, clay, or crushed rock or slate

Definitions

  • the difficulty with attempting to apply a color coat on paper board which is thin enough-to be economical, is that the coating takes a surface which corresponds to the surface which the material had to start with, and therefore, is rough or smooth depending upon the underlying board. Furthermore, if only a small amount of coating is applied, there is not enough plasticity in the coating to permit of its being smoothed and ironed out in calendering thereby to modify the natural board surface. If enough coating were applied to paper board to permit of such smoothing, the practice is too expensive, and indeed requires a high grade base material and so much coating that difficulties of continuous operation would be insuperable in any industrial scale apparatus with which I am familiar.
  • plasticizable material included in the surface treatment imparted under pressure conditions will depend upon the material used, certain water soluble, highly plasticizable materials being preferred, but greater amounts of less plasticizable water-borne materials being satisfactory.
  • Another reason for applying the surface modifying material is that the coincident pressure as applied to the surface modifying agent, will give a more permanent smoothing effect to the paper board surface, forcing to a maximum extent the modifying material into the surface, so that as compared to a mere pressing treatment without the modifying material, the smoothing action will be retained, and the board better prepared to take on a thin color coat when promptly applied.
  • a coating With regard to the subsequent coating, the practice of modifying the surface as indicated permits of the use of color coatings of extreme thinness and this in turn permits of continuous operation from application through drying to calendering without stoppage, which is a great economy in operation.
  • a coating can be applied by means of rolls operating in a manner similar to printing rolls, and can be quite thick in consistency.
  • a coating may be used containing water, a binder of a readily soluble starch, and pigment such as, for example, the usual clay coating mineral matter, the water being only around 50% of the Whole, which is radically less water than is normally used with such a coating.
  • a board given the surface treatment indicated, without any extra drying stage, can be passed immediately between printing rolls to which a film of the aforesaid clay coating is applied, thereby superimposing the coating on the pretreated web, after which a short, continuous drying stage will prepare the web for the final calendering operation.
  • the color coat will not be of a type which could plasticize sufiiciently as to produce a surface independent of the underlying smooth surface which contains a plasticizable material and is water-borne, similarly' to the applied coating; thi coating associates itself with a the underlying material producing a plasticizable surface which can be highly smoothed, giving the effect of what is known as a clay coated board, with much less expense.
  • a mode of operation of making clay coated board is to calender the paper board in the presence of water after it comes from the paper machine, and dry it.
  • the board is then stored prior to the coating treatment.
  • For coating a slurry of clay coating material is applied in several times as thick a layer as used in the coating above noted, and this thick coating is brushed with brushes, smoothed with rolls, festooned and dried. Thereafter, after a further storing period, the board is passed through calenders to give it a finish.
  • the cost of production of such a board is not comparative with the cost of production of the board made as briefly above indicated.
  • the thickness of the coating is such that the surface of the paper board itself is not a controlling factor in the finished surface, there being enough coating to give a surface which is independent of the starting surface, but the coating requires storage and drying periods and a high grade base product is usually necessary.
  • My application filed August 8, 1941, Serial No. 406,074, of which this application is a continuation in part, describes as a surface modifying film, a water soluble polyvinyl alcohol and starch composition, among other things.
  • the surface modifying treatment may be accomplished by the use of starch alone provided a highly soluble form of starch is used, so that from a physical point of view sufficient starch can be applied in the breaker calender stack, i. e. in the presence of high pressure, so that at the end of the operation there will be a surface of sufficient plasticity to react properly and permanently 'to the final calendering.
  • the surface modifying agent should be one which is water-borne, and mainly soluble and dispersable in water, because the color coat is also of this type and the amalgamation of the two is an important aspect of my pract ce.
  • the preliminary treating composition should have the following characteristics. It should be (1) capable of going into solution or dispersions of equivalent character in water, (2) capable of penetration into the surface of the board adequately to coat and condition the surface thereof, (3) capable of being plastically spread after being applied to the board, (4) when applied and plastically spread, giving a surface which can be evenly and uniformly wetted with water, and having wet strength, (5) capable of becoming intimately attached to the subsequently applied and dried mineral coating in aqueous vehicle, (6) sufiiciently low in cost to make commercial use practical in the concentrations required.
  • plasticizable organic substances of resinous character, or behaving like the resins will no doubt include many substances suitable for my purpose except for the fact that their behavior in relation to water as a solvent or dispersing vehicle is not suitable.
  • plasticizable substances which will go into water solution or dispersion in water and these are satisfactory for my purpose although in varying degrees.
  • the polyvinyl alcohols, methyl-cellulose alginate compounds and polyacrylic acid are instances. It is found that polyvinyl alcohol is considerably superior.
  • Polyvinyl alcohol has been applied to paperboard and other paper'products but its properties in preparation of a smooth surface without uneconomical mechanical work, which will take a very smooth and uniform color coat in aqueous vehicle and upon final calendering, continue to exhibit plastic flow so as to produce a most admirable printing surface, has neither been known nor developed.
  • the material used with the board should be applied ahead of any suitable mechanism which will smooth the resulting surface of the material on the board, or in direct connection with any suitable mechanism which will smooth the resulting surface of the material on'the board, which mechanism will be ahead of the point where the color coating is to be applied, preferably as a continuous operation timed with the preparation of the board.
  • the material might be applied on a size press in the drier section of a paper machine, or on a calender stack immediately following the drier section.
  • the figure illustrates the end of a paperboard machine by the rollers l.
  • the web of board is indicated at 2.
  • a so-called break stack or preliminary calender stack is indicated at 3, around which stack of calender rolls, the web of board passes.
  • the boxes 4 are used to apply the sizing or coating material to the web while it passes through the calender stack.
  • From the calender stack the sheet passes directly to a coater for applying a, color coating. This is illustrated as one which applies a thin coating of fairly thick consistency, by means of rolls 5, which are supplied with a surface film of color coating material as by means of spreading rolls 6, 6, to which a suitable fountain apparatus 1 supplies the color coating material.
  • the imprinting coater of this type I refer to Massey Patent 2,105,981 of January 18, 1938.
  • the board passes around driers and finally to the ultimate calendering operation, as
  • Polyvinyl alcohol possesses qualities requisite for conditioning the surface of paperboard for the reception of coatings as described. (For the chemistry of polyvinyl alcohol read The Chemistry of Synthetic Resins by Ellis, volume 2, page 1054 on, edition 1935.) It is Water soluble and therefore can be handled cheaply on the paper machine calenders, size presses, etc., and forms atough, plastic coating or film upon and during evaporation of the water from the solution and, therefore, in connection with the calendering operation, fills and covers the surface of the board to present a smooth, even, compact surface with uniform rate of water absorption and with Wetstrength. This, in turn, exercises control of the quality of overlying color coating, e. g.
  • clay coating since water is absl bed evenly from it to produce, first, a damp coating layer of uniformity, and, upon drying, a dried coating layer of uniformity.
  • the final calendering of the dried coated board may be aided by the plastic nature of the PVA treatment imposed between the paper board and the clay coating and here, again, the effect of moisture, such as steam on the finishing calenders, may be made more effective because of the moisture-sensitive nature of the imposed PVA thus permitting additional movement of coating mix under. the great pressure of the finishing calenders.
  • finely-divided mineral matter such as titanium dioxide
  • PVA finely-divided mineral matter
  • organic dyes and pigments fundamental characteristics imparted by PVA or its equivalent, namely, to fill, compact, smooth, and make uniform in surface finish and water absorptivity the surface of the board later to receive the clay or mineral coating mixture in water.
  • a wax size is altered to reduce the amount of wax and increase the agent, such as protein, used to disperse the Wax in water
  • a corresponding increase in Water absorption and its rate will occur but with decreases in over-all plastic nature of the dried wax size, thus resulting in a board surface less satisfactory for reception of subsequently applied clay or mineral coating than otherwise.
  • a starch film will be water sensitive but less plastic than polyvinyl alcohol.
  • Polyvinyl alcohol is obtainable commercially in difierent kinds and with various viscosities. Some grades are less soluble in hot water than cold and vice versa; some grades have low viscosities in water solutions and others, high; A grade more soluble in hot than in cold water and With low viscosity in solution produces good results when used as described herein. A four per cent water solution of such a grade of polyvinyl alcohol has a viscosity of 20 C. of about 5 centipoises. Due to its lesser viscosity in solution, low viscosity polyvinyl alcohol handles more easily and with less danger of sticking on the calender rolls or other equipment of the paper machine and, therefore, can be used in higher concentration, and is preferred for that reason. On the other hand, films of higher viscosity polyvinyl alcohol are stronger and tougher and are to be preferred if that property proves to be necessary.
  • Water solutions of methyl cellulose also perform in the manner of polyvinyl alcohol on the breaker stack of calenders before the clay coating operation, although not so satisfactorily.
  • Methyl cellulose of low viscosity e. g., 15 centipoises as measured in a 2% aqueous solution at 20 C., is a typically usable grade; here again, the low viscosity grades ofiering advantages of ease of operation.
  • ⁇ A practical problem encountered in the use of methyl cellulose is the necessity of keeping the solution relatively cold at the point of application on the calenders else the methyl cellulose is precipitated out of solution, being more soluble.
  • Methyl cellulose also can be extended or blended with various materials including starch, can be. colored, opacified, etc., as described above in connection with PVA.
  • a resinous material akin to polyvinyl alcohol and likewise water soluble, is polyacrylic acid (see Chemistry of Synthetic Resins by Ellis, volume 2, pages 1070-1073). Applied to paper or board from water solution in the calender box or prior thereto, it should condition board for the reception of clay coating since the quality of Waterreceptivity of the coating remains on the calendered sheet.
  • paper board 2 from the driers I, and moving continuously from a cylinder board making machine was caused to pass between the calender rolls 3 of a breaker stack, and one of the boxes 4, used ordinarily for applying water or starch size by flowing the same into the nips of the calender rolls was supplied in one nip against the top side of the board with the starch jell and the PVA together in water solution-one part by volume of five percent PVA solution (by weight) mixed with four parts by volume of a six percent solution of converted" starch (by weight).
  • the board had a patent white top, news back furnish, finished thickness of .022 inch, and about three to four percent moisture in it when it reached the breaker stack.
  • the resulting coated board was then printed with various printing inks, including letter press inks of the oxidizing and/or polymerizing type and for glos or flat printing. It was found that the coated surface of the board took these inks to produce printing of great uniformity and high quality and that the coating on the board had a good wax pick test, was even, continuous and smooth without hills, valleys, pit marks, etc., resulting from uneven reception and finishing of the coating material, without specks or fuzz, and decidedly improved over one which was treated only with water or a starch solution in the breaker stack, without the polyvinyl alcohol.
  • starch alone may be used, within a certain range. If too little is employed, the desired effect is not gained. If too much is used, it will be unmanageable. A typical raw starch like the pearl" grade of corn starch will not serve because it can be used on the breaker stack only in a maximum concentration of a couple of percent by weight, which is not sufficient for my purpose.
  • Converted or thin boiling starches which are available on the market, and result from treatment with enzymes, chlorine, acids, etc., may be boiled and jellied in water to give solutions of comparatively high solids content with low viscosity of solution, and concentrations up to some 12% solids by weight, can be used without significantly picking the paper surface or sticking to the rolls of a machine calender stack.
  • the use of a small amount of dispersed wax in the starch will reduce its stickiness and not militate against the conditions which my practice requires. In practice some five pounds wax solids to 100 pound converted starch solids, has been used advantageously.
  • the surface of the paper or board to be coated can be conditioned prior thereto so that printing ink will lend itself more readily to a fiat finish than to a gloss.
  • a penetrating or wetting agent here-,
  • penetrating agent in the water solution of PVA, serves to condition the surface of the board so that clay or color coating applied thereon calenders out to a finish of such quality that printing thereon is more suitable for the fiat than the glossy variety.
  • penetrating agent is butyl carbitol, the monobutyl ether of diethylene glycol, a colorless and practically odorless liquid.
  • the sodium salts of sulphuric acid esters of the higher fatty alcohols are useful as penetrants also. This control of gloss in printing is covered in a companion case, whether the penetrating agent is used with the plastic water soluble material or by itself or with other materials.
  • Paperboard, conditioned and coated as described, on one or both surfaces, can be converted into cartons and containers, printed sheets,
  • a process for treating of paper which consists in applying an aqueous polyvinyl alcohol solution to the surface of a Web thereof, passing the same through rolls to plastically smooth the resulting surface, and then while retaining the dampened condition of the web surface, imprinting onto the web a mineral coating in an aqueous vehicle and finally drying and calendering the coated product.
  • a process for treating of paper which consists in applying an aqueous polyvinyl alcohol solution to the surface of a web thereof, passing the same through rolls to plastically smooth the resulting surface, and then while retaining the dampened condition of the web surface, imprinting onto the web a mineral coating in an aqueous vehicle and finally drying and calendering the coated product, the mineral coating being applied in a relatively thin film and relatively drier as applied than normal mineral coating, and all of the steps being applied to a continuously moving web.
  • a process for treating of paper webs which consists in passing a freshly made paper web through rolls, and at the nip thereof applying thereto an aqueous solution of polyvinyl alcohol, and then while retaining the dampened condition of the web surface, imprinting onto the web a mineral coating in an aqueous vehicle, and finally calendering the coated web.
  • a process for treating of paper webs which consists in passing a freshly made paper web through rolls, and at the nip thereof applying thereto an aqueous solution of polyvinyl alcohol, and then while retaining the dampened condition of the web surface, imprinting onto the web a mineral coating in an aqueous vehicle, and
  • a process for treating of paper which consists in applying a plasticizable, film forming Water-borne substance chemically inert to the fibers to the surface of a web thereof, passing the same through rolls to plastically smooth the resulting surface, and then while retaining the dampened condition of the web surface, imprinting onto the web a mineral coating in an aqueous vehicle and finally drying and calendering the coated product.
  • a process for treating of paper which consists in applying a plasticizable, film forming water-borne substance chemically inert to the fibers to the surface of a web thereof, passing the same through rolls to plastically smooth the resulting surface, and then while retaining the dampened condition of the web surface, imprinting onto the web a mineral coating in an aqueous vehicle and finally drying and calendering the coated product, the mineral coating being applied in a relatively thin film and relatively drier as applied than normal mineral coating, and all of the steps being applied to a continuously moving web.
  • a process for treating of paper webs which consists in passing a freshly made paper web through rolls, and at the nip thereof applying thereto a plasticizable, film forming water-borne substance chemically inert to the fibers, and then while retaining the dampened condition of the web surface, imprinting onto the web a mineral coating in an aqueous vehicle, and finally calendering the coated web.
  • a process for treating of paper webs which consists in passing a freshly made paper web through rolls, and at the nip thereof applying thereto a plasticizable, film forming water-borne substance chemically inert to the fibers, and then while retaining the dampened condition of the web surface, imprinting onto the web a mineral coating in an aqueous vehicle, and finally calendering the coated web, the mineral coating being applied in a relatively thin film and relatively drier as applied than normal mineral coating, and all of the steps being applied to a continuously moving web.
  • a process for treating of paper which consists in applying an aqueous polyvinyl alcohol solution to the surface of a web thereof, passing the same through rolls to plastically smooth the resulting surface, and then while retaining the dampened conditionof the web surface, imprinting onto the web a mineral coating in an aqueous vehicle and finally drying and calendering the coated product, the said aqueous polyvinyl alcohol solution comprising up to four parts by volume of a converted starch to one part of the alcohol.
  • a process for treating of paper which consists in applying an aqueous polyvinyl alcohol solution to the surface of a web thereof, passing the same through rolls to plastically smooth the resulting surface, and then while retaining the dampened condition of the web surface, imprinting onto the web a mineral coating in an aqueous vehicle and finally drying and calendering the coated product, the mineral coating being applied in a relatively thin film and relatively drier as applied than normal mineral coating, and all of the steps being applied to a con- 11 tinuously moving web, the said aqueous polyvinyl alcohol solution comprising up to four parts by volume of a converted starch to one part of the alcohol.
  • a process for treating of paper webs which consists in passing a freshly made paper web through rolls, and at the nip thereof applying thereto an aqueous solution of polyvinyl alcohol, and then while retaining the dampened condition of the web surface, imprinting onto the web a, mineral coating in an aqueous vehicle, and finally calendering the coated web, the said aqueous polyvinyl alcohol solution comprising, up to four parts by volume of a converted starch to one part of the alcohol.
  • a process for treating of paper webs which consists in passing a freshly made paper web through rolls, and at the nip thereof applying thereto an aqueous solution of polyvinyl alcohol, and then while retaining the dampened condition of the web surface, imprinting onto the web a mineral coating in an aqueous vehicle, and finally calendering the coated web, the mineral coating being applied in a relatively thin film and relatively drier as applied than normal mineral coating, and all of the steps being applied to a continuously moving web, the said aqueous polyvinyl alcohol solution comprising up to four parts by volume of a converted starch to one part of the alcohol.
  • a process for treating of paper which consists in applying a solution in water of starch of at least substantially concentration to the surface of a web thereof, passing the same through rolls to plastically smooth the resulting surface, and then while retaining the dampened condition of the web surface, imprinting onto the web a mineral coating in an aqueous vehicle and finally drying and calendering the coated product.
  • a process for treating of paper which consists in applying a solution in water of starch of at least substantially 5% concentration to the surface of a web thereof, passing the same through rolls to plastically smooth the resulting surface, and then while retaining the dampened condition of the web surface, imprinting onto the web a mineral coating in an aqueous vehicle and finally drying and calendering the coated product, the mineral coating being applied in a relatively thin film and relatively drier as applied than normal mineral coating, and all of the steps being applied to a continuously moving web.
  • a process for treating of paper webs which consists in passing a freshly made paper web through rolls, and at the nip thereof applying thereto a solution in water of starch of at least substantially 5% concentration, and then while retaining the dampened condition of the web surface, imprinting onto the web a mineral coating in an aqueous vehicle, and finally calendering the coated web.
  • a process for treating of paper webs which consists in passing a freshly made paper web through rolls, and at the nip thereof applying thereto a solution in water of starch of at least substantially 5% concentration, and then while retaining the dampened condition of the web surface, imprinting onto the web a mineral coating in an aqueous vehicle, and finally calenderin the coated web, the mineral coating being applied in a relatively thin film and relatively drier as applied than normal mineral coating, and all of the steps being applied to a continuously moving web.
  • Acoated paper board product consisting of paper board having on its surface a thin layer of independently plasticized, smoothed and spread polyvinyl alcohol, and superposed upon and merged into said layer,-a layer of mineral coating dried from an aqueous vehicle, the whole having a subsequently applied calendered finish.
  • a coated paper board product consisting of paper board having on its surface a thin layer of independently plasticized, smoothed and spread plasticizable, film forming, water-borne substance inert to the fibers, and superposed upon and merged into said layer, a layer of mineral coating dried from an aqueous vehicle, the whole having a subsequently applied calendered finish.
  • a coated paper board product consisting of paper board having on its surface a thin layer of a chemically inert substance, having the property of forming a solution or dispersion in water, and yet being plastic in the sense that it can be spread and smoothed into an integral layer and water wettable after spreading and smoothing, said layer being independently plasticized, smoothed and spread, and superimposed upon said layer, a layer of mineral coating dried from an aqueous vehicle merged into the underlying layer, the whole having a calendered surface.
  • a coated paper board product consisting of paper board having on its surface, and in intimate attachment thereto, a thin layer of independently plasticized, smoothed and spread substance comprising polyvinyl alcohol and starch, and superimposed upon and intimately attached to said layer, a coating of finely-divided mineral matter with starch binder dried from an aqueous vehicle, the whole having a calendered finish.
  • a coated paper board product consisting of paper board having on its surface and in adhesive contact therewith a thin layer of a chemically inert substance, having the property of forming a solution or dispersion in' water, and yet being plastic in, the sense that it can be spread and "upon said layer, and

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US501320A 1943-09-04 1943-09-04 Method of production of coated board and paper Expired - Lifetime US2419207A (en)

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BE471279D BE471279A (en)van) 1943-09-04
NL68929D NL68929C (en)van) 1943-09-04
US501320A US2419207A (en) 1943-09-04 1943-09-04 Method of production of coated board and paper
FR941399D FR941399A (fr) 1943-09-04 1947-02-05 Perfectionnements au procédé de traitement du papier et des feuilles de papier et produits obtenus par ce procédé

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2515340A (en) * 1947-04-01 1950-07-18 Gardner Board & Carton Co Coated paperboard and method of makign same
US2578345A (en) * 1946-11-23 1951-12-11 Cons Water Power & Paper Co Method for imprinting coatings on paper and paperboard
US2646770A (en) * 1948-07-24 1953-07-28 Scholl Mfg Co Inc Coating apparatus for making pressure-sensitive tape
US2656286A (en) * 1945-08-29 1953-10-20 Cons Water Power & Paper Co Process of coating paper webs and product thereof
US2698259A (en) * 1950-05-27 1954-12-28 Gardner Board & Carton Co Manufacture of water finished board having an insolubilized protein-mineral coating t hereon
US2725306A (en) * 1953-04-20 1955-11-29 Gardner Board & Carton Co Production of coated board for gloss ink printing and article produced thereby
US2756164A (en) * 1950-10-18 1956-07-24 Gardner Board & Carton Co Process of producing moisture resistant coated paper webs
US2772184A (en) * 1953-09-21 1956-11-27 Kimberly Clark Co Paper coating
US2920991A (en) * 1954-01-14 1960-01-12 Diamond National Corp Procedure for making colored coated board by imprinting
US3124504A (en) * 1960-04-04 1964-03-10 Gloss finishing of uncoated paper
EP0370782A3 (en) * 1988-11-24 1990-10-03 Oji Paper Company Limited Heat-sensitive recording paper
US5171730A (en) * 1988-11-24 1992-12-15 Oji Paper Co., Ltd. Heat-sensitive recording paper
US11525217B2 (en) 2019-12-17 2022-12-13 Westrock Mwv, Llc Coated paper and paperboard structures
US20230141227A1 (en) * 2020-03-31 2023-05-11 Eska B.V. Process for producing coloured cardboard in a cardboard production apparatus, and coloured produced by such a process

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1838358A (en) * 1929-02-11 1931-12-29 Champion Coated Paper Company Process for making coated paper
US2251296A (en) * 1938-06-01 1941-08-05 Du Pont Paper product
US2256853A (en) * 1938-06-01 1941-09-23 Du Pont Paper product
US2287161A (en) * 1940-01-23 1942-06-23 Du Pont Coated cellulosic products and method for producing the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1838358A (en) * 1929-02-11 1931-12-29 Champion Coated Paper Company Process for making coated paper
US2251296A (en) * 1938-06-01 1941-08-05 Du Pont Paper product
US2256853A (en) * 1938-06-01 1941-09-23 Du Pont Paper product
US2287161A (en) * 1940-01-23 1942-06-23 Du Pont Coated cellulosic products and method for producing the same

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2656286A (en) * 1945-08-29 1953-10-20 Cons Water Power & Paper Co Process of coating paper webs and product thereof
US2578345A (en) * 1946-11-23 1951-12-11 Cons Water Power & Paper Co Method for imprinting coatings on paper and paperboard
US2515340A (en) * 1947-04-01 1950-07-18 Gardner Board & Carton Co Coated paperboard and method of makign same
US2646770A (en) * 1948-07-24 1953-07-28 Scholl Mfg Co Inc Coating apparatus for making pressure-sensitive tape
US2698259A (en) * 1950-05-27 1954-12-28 Gardner Board & Carton Co Manufacture of water finished board having an insolubilized protein-mineral coating t hereon
US2756164A (en) * 1950-10-18 1956-07-24 Gardner Board & Carton Co Process of producing moisture resistant coated paper webs
US2725306A (en) * 1953-04-20 1955-11-29 Gardner Board & Carton Co Production of coated board for gloss ink printing and article produced thereby
US2772184A (en) * 1953-09-21 1956-11-27 Kimberly Clark Co Paper coating
US2920991A (en) * 1954-01-14 1960-01-12 Diamond National Corp Procedure for making colored coated board by imprinting
US3124504A (en) * 1960-04-04 1964-03-10 Gloss finishing of uncoated paper
EP0370782A3 (en) * 1988-11-24 1990-10-03 Oji Paper Company Limited Heat-sensitive recording paper
US5171730A (en) * 1988-11-24 1992-12-15 Oji Paper Co., Ltd. Heat-sensitive recording paper
US11525217B2 (en) 2019-12-17 2022-12-13 Westrock Mwv, Llc Coated paper and paperboard structures
US20230141227A1 (en) * 2020-03-31 2023-05-11 Eska B.V. Process for producing coloured cardboard in a cardboard production apparatus, and coloured produced by such a process
US12338580B2 (en) * 2020-03-31 2025-06-24 Eska B.V. Process for producing coloured cardboard in a cardboard production apparatus, and coloured produced by such a process

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