Paper Base (e.g., Calendering, Etc.) Patents (Class 427/361)
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Patent number: 6436465Abstract: A magnetic paint is extrusion coated to a length of splice jointed webs through a coating head by continuously feeding the length of webs across the head. When a splice joint passes across the head, the head is moved apart from the web before passage and contacted with the web after passage. Objectionable coating portions which are formed as a result of moving the head out of and into contact with the web are scraped off by a scraping roll downstream of the head.Type: GrantFiled: October 30, 1996Date of Patent: August 20, 2002Assignee: TDK CorporationInventors: Eizo Tsunoda, Yutaka Shimizu, Masujiro Seki, Naomi Yoshiike, Kazuo Katai, Katsumi Onozawa
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Patent number: 6413370Abstract: A coated roll printing paper for printing with the cold-set offset-printing process is described, which gives a printing result comparable with that of low-weight coated matte grades. The paper is characterized by a high proportion of a fine calcium carbonate in the coating pigment, and a relatively low proportion of highly active binders.Type: GrantFiled: August 7, 2000Date of Patent: July 2, 2002Assignee: Haindl Papier GmbHInventors: Hartmut Wurster, Hans-Peter Hofmann
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Patent number: 6410158Abstract: A coated paper product having high gloss and brightness is prepared by a process wherein a paper substrate is coated on at least one side with an aqueous coating formulation comprising an effective amount of a plastic pigment, and finished in a supercalender device containing heated rolls to produce a surface which is comparable to a cast coated surface.Type: GrantFiled: February 21, 2001Date of Patent: June 25, 2002Assignee: Westvaco CorporationInventors: Dean R. Johnson, Eric D. Johnson, James E. Shultz
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Patent number: 6399949Abstract: An infrared inspection system and an induction heating system used in conjunction enable the inspection of rubber coated rolls, such as rolls used in the pulp and paper industry. The system effects non-destructive inspections of rubber coated rolls to detect a debonded condition between the metal core and rubber coating. The method includes supporting a roll for inspection, evenly heating or cooling the roll, and observing a thermal transient of the roll generated by the evenly heating process. Using an infrared camera, observed areas that are not transferring heat uniformly with respect to neighboring areas are suspected debonded areas.Type: GrantFiled: December 22, 2000Date of Patent: June 4, 2002Assignee: General Electric CompanyInventors: Robert Martin Roney, Jr., John William Devitt, David Roy Parker, Vladimir Pilic
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Patent number: 6387213Abstract: A printing paper is provided having the appearance of uncoated paper and improved printability properties approaching those of coated papers. Also provided are a surface treatment formulation having a variable viscosity and a method for producing a printing paper having the appearance of uncoated paper and the improved printability properties approaching those of coated papers.Type: GrantFiled: August 25, 1999Date of Patent: May 14, 2002Assignee: Mohawk Paper Mills, Inc.Inventor: Thomas D. Ruch
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Patent number: 6383450Abstract: A method of producing a packaging laminate for aseptic packages of the type which is produced in that a web of the packaging laminate is, for the purpose of sterilization, led through a bath of hydrogen peroxide prior to the reforming of the web into aseptic packages. The packaging material is produced in that a web of paper which has, on the one side of the web, an applied outer coating of plastic, is, for the purpose of promoting adhesion, subjected to a surface treatment changing polarity, where after the treated outer plastic coating is provided with a decor of water-based printing ink which is applied in the desired pattern on the outside of the outer plastic coating.Type: GrantFiled: November 12, 1999Date of Patent: May 7, 2002Assignee: Tetra Laval Holdings & Finance S.A.Inventors: Rolf Lasson, Christer Karlsson, Kaj Johansson, Zoltan Pusztai
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Patent number: 6309704Abstract: A device for direct or indirect application of a liquid or viscous coating medium onto a moving material web, specifically a paper or cardboard web, includes an applicator unit which, in the direct application method, applies the coating medium in the form of a coating layer directly onto the material web at a point of application. In the indirect application method, the coating medium is first applied onto an applicator element, for example an applicator roll, which then transfers, at the point of application, the coating medium to the material web in the form of a coating layer. In addition, a drying device for drying of the coating layer is provided downstream from the point of application, viewed in the direction of flow of the material web. In the applicator unit, a device for moistening and/or warming the material web, coating medium or the coating layer is additionally provided before the drying device, viewed in the flow direction of the material web.Type: GrantFiled: January 12, 1999Date of Patent: October 30, 2001Assignee: Voith Sulzer Papiertechnik Patent GmbHInventors: Harald Hess, Rüdiger Kurtz, Benjamin Mendéz-Gallon
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Patent number: 6306461Abstract: A method and apparatus for coating a paper or a paper board web, comprising spreading coating mix having a solids content of 55-75% on the surface of the web with a nozzle applicator, levelling and metering the spread coating mix on the surface of the web by a doctor element capable of producing a high hydrodynamic force on the coating layer between the doctor element and the web, the doctor element being located downstream of the applicator so that the dwell time between the spreading of the coating mix to the metering is 72-2400 ms. The web speed is preferably 100-1000 m/s. A good smoothness and coverage is achieved by this method due to long dwell time.Type: GrantFiled: December 17, 1999Date of Patent: October 23, 2001Assignee: Valmet CorporationInventors: Mika Leino, Stig Renvall, Stefan Kuni, Petri Paloviita
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Patent number: 6274001Abstract: A calendering method which enhances the smoothness of surface sized paper/paperboard by a combination of temperature and moisture gradient calendering processes without the fiber sticking/picking problems that affect runnability and without using waterboxes. The moisture gradient calendering is performed so that the cross direction moisture profile can be corrected and high smoothness levels can be obtained. Heated calender rolls form a hot pressure nip having a temperature greater than the temperature of the moisturized web. Lubricant is applied to both sides of the web to prevent fiber sticking/picking in the hot nip. The lubricant may be applied by the size press, by the moisturizing showers or by separate lubricant showers. The smoothness developed by moisturizing and hot nip calendering is substantially irreversible.Type: GrantFiled: October 21, 1997Date of Patent: August 14, 2001Assignee: International Paper CompanyInventor: K. Krishna Mohan
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Patent number: 6258214Abstract: A process for the manufacture of SC-A paper having a high gloss and high smoothness, wherein the paper arriving from the paper machine is supplied on-line to a supercalender (multinip soft calender), and wherein the paper travels through a plurality of nips for achieving the desired gloss and smoothness properties. The paper web arriving from the paper machine and supplied on-line to a supercalender (multinip soft calender) is moistened with steam immediately prior to the first nip of the supercalender and is guided through the first nip before the increased moisture of the surface resulting from the application of steam has dropped below a predetermined value in the range of 12% to 25%.Type: GrantFiled: September 24, 1999Date of Patent: July 10, 2001Assignee: V.I.B. Apparatebau GmbHInventors: Stefan Winheim, Rudolf Mann
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Patent number: 6251477Abstract: Apparatus and method for coating a moving paper web, in which the web (2) to be coated is first guided to a coating station (7) correctly aligned and a first side of the web (2) is coated with a coat layer. Next, the web (2) is guided upwards from the coating station (7) and the first coat layer is dried using non-contact dryers (8, 9). From the dryers the web (2) is guided to the next coating station (14) correctly aligned, and the second side of the web (2) is coated with a coat layer, the web (2) is guided upwards from the coating station (14) and the coat layer on the second side of the web (2) is dried using non-contact dryers (8, 9). When the web is directed from the coating station (7) through the dryers (8, 9), it (2) is guided non-contactingly by means of air jets such that the web (2) is first non-contactingly turned in the machine direction during drying and next, similarly during drying, towards the level of the coating stations (7, 14).Type: GrantFiled: August 4, 1999Date of Patent: June 26, 2001Assignee: Valmet CorporationInventors: Jorma Kinnunen, Vilho Nissinen
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Patent number: 6242047Abstract: A coated paper product having high gloss and brightness is prepared by a process wherein a paper substrate is coated on at least one side with an aqueous coating formulation comprising an effective amount of a plastic pigment, and finished in a supercalender device containing heated rolls to produce a surface which is comparable to a cast coated surface.Type: GrantFiled: April 12, 1999Date of Patent: June 5, 2001Assignee: Westvaco CorporationInventors: Dean R. Johnson, Eric D. Johnson, James E. Shultz
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Patent number: 6217940Abstract: Method and apparatus for coating a moving paperboard web with at least two coating layers. A first coating layer is applied onto the surface of the web and a second coating layer is applied onto the surface of this first undried coating layer. The first coating layer is applied by means of a film transfer coater and the second coating layer is applied by means of a nozzle applicator, whereby the first layer is neither mixed nor doctored off the web during the application of the second layer.Type: GrantFiled: May 21, 1999Date of Patent: April 17, 2001Assignee: Valmet CorporationInventor: Stefan Kuni
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Patent number: 6200424Abstract: An arrangement and method for calendering a board web including a calender providing a hot and hard calendering nip formed by two calender rolls and through which the board web passes. At least one of the calender rolls is arranged to be heated to such a temperature that the surface layer of the board web placed at the side of this roll reaches its vitrification temperature in the calendering nip. A film press is arranged directly before the calendering nip in the direction of transfer of the board web and includes a film press nip through which the board web is passed. The film press nip is arranged to transfer a liquid layer onto the face of the board web so as to moisten the board web. The board web is transferred from the film press nip into the calendering nip while the surface layer of the web is at the moisture level determined by the film press in view of producing a controlled moisture gradient.Type: GrantFiled: July 16, 1997Date of Patent: March 13, 2001Assignee: Valmet CorporationInventors: Juhani Saari, Stefan Kuni
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Patent number: 6197380Abstract: A lactide polymer coating resulting in a strong, repulpable, high gloss, paper coating. The lactide polymer comprises a plurality of poly(lactide) polymer chains, residual lactide in concentration of less than about 5 percent and water in concentration of less than about 2000 parts-per-million. A process for coating paper with the lactide polymer composition is also disclosed.Type: GrantFiled: April 6, 1999Date of Patent: March 6, 2001Assignee: Cargill, IncorporatedInventors: Patrick Richard Gruber, Jeffrey John Kolstad, Christopher M. Ryan, Eric Stanley Hall, Robin Sue Eichen Conn
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Patent number: 6190729Abstract: A method and apparatus for two-side coating of a light base weight printing paper web containing mechanical pulp or recycled fiber. The first side of a web (5) is coated in a first coating station (1), the coating applied to the first side is dried at least partially in a first dryer unit (3). The second side of the web (5) is coated subsequent to the drying of the first side in a second coating station (2), and the coating applied to the second side is dried at least partially in a second dryer unit (4). Both coatings are formed by applying a required amount of coating mix onto the perimeter of respective soft film-coating rolls (22) and subsequently transferring the coat film to the web (5) in a nip (N1) formed between a respective backing roll (24) and the respective soft film-coating roll (22).Type: GrantFiled: March 12, 1997Date of Patent: February 20, 2001Assignees: Valmet Corporation, Metsä-Serla Paperi Ja Kartonki OyInventors: Rauno Rantanen, Kai Vikman
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Patent number: 6183814Abstract: A coated paper product including a paper layer and a polymer layer, wherein the polymer layer includes a polylactide polymer composition having a ratio of Mz to Mn of greater than about 6. The polymer composition, when melted, exhibits a die swell of greater than about 1.25 for a melt flow index of greater than about 2. Polymer lactide compositions, methods of manufacturing the polymer composition and the coated paper product, and articles produced therefrom are also described.Type: GrantFiled: May 23, 1997Date of Patent: February 6, 2001Assignee: Cargill, IncorporatedInventors: James Nangeroni, Mark H. Hartmann, Matthew L. Iwen, Christopher Michael Ryan, Jeffrey J. Kolstad, Kevin T. McCarthy
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Patent number: 6183603Abstract: This invention relates to calendering systems. Such structures of this type, generally, employ the use of hard and soft nips to provide excellent smoothness without gloss mottle.Type: GrantFiled: March 12, 1999Date of Patent: February 6, 2001Assignee: Westvaco CorporationInventors: Stephen Nicholson, Steven Herman Parker, Domenick Larry Raschella, Sharon Rae Stampfl
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Patent number: 6171653Abstract: An apparatus applies a liquid or viscid coating medium onto a moving material web, especially one made of paper or cardboard. A coating mechanism first applies the coating medium onto an applicator element or an applicator roll, which subsequently transfers the coating medium at a coating location onto the material web in the form of a coating layer. Furthermore, if so desired, a doctoring device can be positioned at a doctor station, adjacent to the coating location, on the downstream side relative to the movement of the material web for the purpose of smoothing and/or metering the coating. The coating apparatus incorporates an apparatus for the generation and/or supplying of a fluid, preferably steam. This apparatus is positioned adjacent to the coating location or to the doctor station on the downstream side relative to the movement L of the material web.Type: GrantFiled: January 8, 1999Date of Patent: January 9, 2001Assignee: Voith Sulzer Papiertechnik Patent GmbHInventors: Bernhard Kohl, Martin Kustermann, Oswald Satzger, R{umlaut over (u)}diger Kurtz, Harald Hess, Karl-Heinz Hannen, Hans Peter Hoffmann, Franz Kustos
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Patent number: 6156387Abstract: The invention relates to a process for the thermomechanical surface treatment of flat webs of material, particularly those made of paper and carton, and to agents for performing said process. According to the process of the invention, adhesion between the flat web of material and the surface of the tool used in thermomechanical surface treatment, e.g., a roll or a press, is reduced or prevented by using an abhesive agent, which contains dicarboxylic dialkyl esters and/or diisoalkyl esters of C.sub.2 -C.sub.12 dicarboxylic acids with C.sub.1 -C.sub.13 n- and/or iso-alkanols as component with abhesive effect. The abhesive agent is preferably employed as an oil-in-water emulsion and is either applied to the surface of the tool used in said thermomechanical treatment or is added to the impregnating fluid or the paper coating mass or the moistening water or the steam in pre-moistening, or is applied to the paper web after the impregnating unit or directly before the smoothing roll.Type: GrantFiled: November 5, 1998Date of Patent: December 5, 2000Assignees: Stockhausen GmbH & Co. KG, Kaemmerer GmbHInventors: Joachim Werres, Bernd Reinhardt
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Patent number: 6123996Abstract: The present invention relates to an aqueous composition for coating, such as sizing or application of a layer of a coating slip, of cellulose-based two-dimensional products. The composition has improved properties at increased temperatures and at high shear rates. These properties are achieved by using as a thickening agent a cellulose ether which is substituted with hydroxyalkyl groups, such as hydroxyethyl and hydroxypropyl, and alkyl groups having 1-3 carbon atoms, and which has a cloud point in the range from 35 C. to 80 C.Type: GrantFiled: February 23, 1999Date of Patent: September 26, 2000Assignee: Akzo Nobel Surface Chemistry ABInventors: Kerstin Larsson, Erland Hermansson, Dan Eklund, Peter Dahlvik
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Patent number: 6117491Abstract: The present invention concerns a process and a coating color for coating a cellulosic web. According to the process an aqueous coating color is applied on the surface of the web. The invention comprises using a coating color which contains an aqueous polymer whose viscosity in an aqueous solution increases when the temperature rises. Preferably, methylcellulose or a corresponding polymer having a gelling temperature of about 5 to 10 .degree. C. more than the application tempature of the coating color is used. The temperature of the coating is increased after the application of the coating color in order to achieve gelling of the polymer. As a result, the coating color rapidly solidifies which decreases the amount of mixture being recycled and it reduces mist-formation in the film press method and improves coverage of coating applied by conventional blade coating.Type: GrantFiled: January 13, 1998Date of Patent: September 12, 2000Assignee: Metsa-Serla OyInventors: Anne Rutanen, Petri Silenius, Jyrki Kettunen
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Patent number: 6113981Abstract: A method for coating paperboard comprising heating paperboard to a temperature sufficient to remove at least some moisture from the paperboard; applying an aqueous dispersion of at least one water-dispersible polymer to the paperboard product; heating the paperboard to at least partially cure the water-dispersible polymer; and cooling the paperboard to at least 160 degrees Fahrenheit to reduce the tackiness of the cured water-dispersible polymer.Type: GrantFiled: November 17, 1998Date of Patent: September 5, 2000Assignee: Madison-Oslin ResearchInventors: Morgan O. Ogilvie, Jr., Paul M. Whatley, Jr., Michael W. Olvey
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Patent number: 6106902Abstract: A method and apparatus for coating a moving web of paper of paper-board. In the method, the web to be coated is passed to a coater station, wherein a coat layer is applied to at least one surface of the web, and the web is dried at least to some degree and passed to the next treatment step. The coat is applied by spraying the coating mix on the web surface by a high-pressure spraying nozzles, the pattern width covered by a single nozzle is essentially narrower than the cross-machine width of the web being coated.Type: GrantFiled: May 14, 1998Date of Patent: August 22, 2000Assignee: Valmet CorporationInventors: Jukka Koskinen, Erkki Kirveskari, Vilho Nissinen, Jorma Kinnunen, Seppo Luomi
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Patent number: 6103314Abstract: A method and apparatus for coating a moving paper or paperboard web (1), in which coating mix is applied to the surface of the web (1) by means of a rotating applicator roll (11). The coating mix applied to the web (1) is levelled with the help of smoothing means (4, 5, 6) acting against a backing roll (8). The web (1) to be coated is presses against the applicator roll (11) with the help of an endless band (2), which is adapted to pass over at least the applicator roll (11), the backing roll (8) and an adjustment roll (10) placed upstream of the applicator roll so that the band (2) with the web (1) backed by the band (2) are together deflected to pass over the applicator roll (11) along their path between the adjustment roll (10) and the backing roll (8).Type: GrantFiled: October 25, 1996Date of Patent: August 15, 2000Assignee: Valmet CorporationInventor: Jorma Kinnunen
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Patent number: 6099909Abstract: The invention relates to a coating method and device for coating a size-press roll, paper or board or a corresponding moving base. The coating device comprises a revolving coating bar which rests against the moving base and extends across the machine width. The coating bar is supported in a cradle substantially over its entire length and is a large-diameter grooved bar fitted against the moving base. The coating bar spreads and smoothes a coating agent onto the moving base. The coating agent is introduced into the coating device in advance of the coating bar in the running direction of the moving base.Type: GrantFiled: May 20, 1993Date of Patent: August 8, 2000Assignee: Valmet Paper Machinery, Inc.Inventors: Rauno Rantanen, Hannu Korhonen, Markku Lummila, Timo Lintula
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Patent number: 6022448Abstract: The present invention relates to coated paperboard for formed articles, which paperboard consists of a fibermatrix in one, two or more layers and a coating and has adequate surface for printing and adequate surface gloss for each specific type of formed articles. The paperboard has been calendered after coating with a heatable calender having a soft extended nip, and has reduced density and reduced grammage at a given value for bending force compared to corresponding coated paperboard which has been calendered before or during and after coating with a heatable or non-heatable calender having a hard or soft nip. Additionally, a production line for the production of such coated paperboard, a process for the production of such coated paperboard, and a method of reducing the susceptibility to crack formation at folding of such a coated paperboard, are described.Type: GrantFiled: October 10, 1997Date of Patent: February 8, 2000Assignee: Korsnab ABInventors: Goran Eriksson, Klas-Erik Karlsson, Nils .ANG.ke Larsson, Sven H.ang.kansson
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Patent number: 6013359Abstract: A printing paper, especially a newsprint base paper, comprising: a base paper; and a coating layer for improving surface strength of the coated paper and releasing-property when two sheets of the coated paper are stacked, which coating layer is formed on the base paper by using a coating-transcription system such as a gate roll coating system, which coating layer comprises at least either a homopolymer polyacrylamide or a nonionic-copolymer polyacrylamide in a coating weight of from 0.01 g/m.sup.2 to 0.2 g/m.sup.2, wherein the homopolymer polytcrylamide and the nonionic-copolymer polyacrylamide have a weight average molecular weight ranging from 20,000 to 250,000, thereby improving not only surface strength but also releasing-property in a printing paper, especially in a newsprint paper having a basis weight less than 46 gm.sup.2.Type: GrantFiled: December 12, 1996Date of Patent: January 11, 2000Assignees: Nippon Paper Industries Co., Ltd., Seiko Chemical Industry Co., Ltd.Inventors: Toshiyuki Takano, Motoi Fukuda, Toshimi Satake, Masahide Taniguchi
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Patent number: 5985367Abstract: A process for preparing a coated printing paper by applying a coating solution containing a pigment and an adhesive to a base paper, which comprises coating the base paper with the coating solution containing 30 to 90% by weight, based on 100% by weight of pigment components, of rice grain- or spindle-shaped precipitated calcium carbonate as a pigment component, the precipitated calcium carbonate being produced by slaking calcium oxide with a white liquor, followed by causticization with a green liquor, at a causticizing step during pulp production by the sulfate process or the soda process; whereby the coated printing paper free from uneven gloss, mottling, and trapping unevenness, and excellent in ink drying properties and operability with a blade coater is provided.Type: GrantFiled: September 14, 1998Date of Patent: November 16, 1999Assignee: Nippon Paper Industries Co., Ltd.Inventors: Eiji Nishijima, Yuji Sato, Yasunori Nanri, Shoichi Miyawaki
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Patent number: 5952091Abstract: A web printing paper, including a coating base paper which contains mineral filler and at least one of wood pulp and cellulose as fiber components. The coating base paper has a grammage of 30 to <58 g/m.sup.2, and a filler content, relative to its grammage, equal to 15 to 35% by weight. The coating base paper selectively contains, in addition to the at least one of wood pulp and cellulose, up to <50% by weight recycled fibers, all weight parts adding up to 100% by weight. The printing paper further includes a coating applied to both sides of the base paper by a film press so as to absorb printing ink. The coating contains pigment and binder. The coating on each side of the base paper has a grammage of 2 to 12 g/m.sup.2, and the pigment of the coating has a grain size, 40 to 60% by weight, of <2 .mu.m.Type: GrantFiled: September 30, 1996Date of Patent: September 14, 1999Assignee: Stora Feldmuhle AGInventors: Dieter Horand, Adam Gurtler, Bernd Pelech, Paul-Heinz Dahling
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Patent number: 5916419Abstract: This invention relates to calendering systems. Such structures of this type, generally, employ the use of hard and soft nips acting on a heated roll to provide excellent smoothness without gloss mottle.Type: GrantFiled: December 1, 1997Date of Patent: June 29, 1999Assignee: Westvaco CorporationInventors: Stephen Nicholson, Steven Herman Parker, Domenick Larry Raschella, Sharon Rae Stampfl
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Patent number: 5879486Abstract: Apparatus and method for producing gypsum board, comprising apparatus for coating a cover sheet with a relatively high density gypsum slurry, apparatus for forming edge borders on the sheet with relatively high density gypsum slurry, and apparatus for forming a core on the coating and between the edge borders, the core comprising a relatively low density gypsum. The apparatus for coating the sheet comprises a relatively soft pressure roll and a relatively hard coating roll, the two rolls being normally pressed together to form a nip between them and a sheet to be coated passing through the nip. The pressure roll is below the sheet and the coating roll, and the axis of the pressure roll is offset from the axis of the coating roll in upstream direction of the movement of the sheet. The pressure roll has a surface area which contacts and moves in the same direction as the sheet, and the coating roll has a surface area which contacts and moves in the opposite direction of the sheet.Type: GrantFiled: July 25, 1997Date of Patent: March 9, 1999Assignee: National Gypsum CompanyInventors: John L. Philips, Herman C. Fraley
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Patent number: 5868902Abstract: The present invention relates to a method for producing security paper which includes a security feature. The method comprises forming paper in a wet state, which paper incorporates on or more security features, applying to the paper a sizing agent, thereafter applying to one or both sides of the sized paper a coating comprising an unpigmented polyurethane. The unpigmented polyurethane may optionally comprise a functional additive provided that the presence of the functional additive does not increase the opacity of the paper by more than 1%. After the polyurethane has been applied the paper is dried. The coating composition provides a film, when cast on a glass surface, having a Konig hardness of from 15 to 130 seconds.Type: GrantFiled: September 10, 1997Date of Patent: February 9, 1999Assignee: Portals LimitedInventors: Paul Howland, Jonathan Paul Foulkes
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Patent number: 5827616Abstract: A process for manufacturing a material from a greaseproof paper used as support. At least one face of the support is coated with water or at least one aqueous solution. The support thus becomes a pliable support, The surface of the pliable support is treated by depositing one or more pigmented layers on the surface. This treatment improves the qualities of metallization or of printing or of both of the paper, relative to uncoated greaseproof paper. The pliable support thus becomes a pliable coated support. The pliable coated support is then calendared.Type: GrantFiled: July 19, 1996Date of Patent: October 27, 1998Assignee: Sibille DalleInventors: Pierre Girard, Jean-Claude Trillat
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Patent number: 5807621Abstract: Casting paper of a desired surface texture or finish for use in the manufacture of artificial leather is produced by heating the polymer coating 1 of a polymer-coated paper 2 to a temperature sufficient to melt the polymer and then cooling the polymer coating from its molten state to a solid state as it passes through a nip between an embossing roll 3 having a surface configuration corresponding to said desired surface texture or finish and a backing roll 4, thereby to impart the surface configuration of the embossing roll to the polymer-coated paper. The polymer is preferably polyolefinic, for example poly (4-methyl-1-pentene) or a polypropylene/polyethylene blend. An anti-curl back-coat, for example of polyvinyl alcohol, can be applied after the embossing operation.Type: GrantFiled: October 18, 1996Date of Patent: September 15, 1998Assignee: The Wiggins Teape Group LimitedInventors: Nicholas John Kite, Peter Sinclair, Roger Anthony Allen, Neil Harvey Clifford
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Patent number: 5789031Abstract: A process for manufacturing a coated paper for use in printing is characterized in that the coated paper for printing is produced by coating a color consisting mainly of pigment and a water-soluble binder made of starch or starch derivatives to the surface of a base paper, then drying and finishing it. Steam or an aqueous penetrant solution having a penetrating force of less than 50 seconds is sprayed or applied over the dry coated layer surface of the coated paper, prior to it being finished with a calender, for redistributing the water-soluble binder in the coated layer in order to correct its uneven distribution, which is the cause of printing mottle during the offset printing operation.Type: GrantFiled: December 16, 1996Date of Patent: August 4, 1998Assignee: Oji Paper Co., Ltd.Inventors: Tetsuya Hirabayashi, Hideyuki Suzuki, Terunobu Fukui
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Patent number: 5782977Abstract: A device for the coating of a travelling web (7), preferably a paper web, comprising a back-up element (3), a metering means (9) cooperating therewith and intended for the application onto the web (7) across essentially the full width thereof a coating liquid (13), a coating blade (17) positioned downstream of the metering means (9), and means for feeding the web (9) in the nip between the back-up element (3) and the metering means (9) and between the back-up element (3) and the coating blade (17). The device further comprises at least one edge lubricating means (27) which is positioned adjacent to one edge (43) of the web and upstream of the metering means (9), and which is arranged to deposit along said one edge (43) a string of lubricating liquid at least up to a position cross-wise and inwardly of the web adjacent to the margin of the coating liquid (13) when applied, whereby uneven wear of the coating blade (17) is avoided; and a process for the coating of a travelling web.Type: GrantFiled: June 11, 1996Date of Patent: July 21, 1998Assignee: BTG Kalle Inventing ABInventors: Tore Eriksson, H.ang.kan Karlsson
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Patent number: 5776619Abstract: An improved coated paperboard or plate stock useful for forming substantially rigid food containers such as plates, bowls, trays and the like and a process from producing the improved coated paperboard are provided. A base coat comprising a styrene acrylic latex and a pigment is applied directly to the paperboard, and a top coat comprising a styrene acrylic polymer latex and a pigment is applied directly to the base coat to form the coated plate stock. The improved coated plate stock is characterized by improved grease, oil and cut resistance, improved varnish gloss, enhanced smoothness, and improved printing quality.Type: GrantFiled: July 31, 1996Date of Patent: July 7, 1998Assignee: Fort James CorporationInventor: Kenneth J. Shanton
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Patent number: 5763009Abstract: Improved process for producing a support for recording material comprising the steps of calendering a base paper including 1.8%-10.0% water content under nip pressure from 400 kg/cm to 3000 kg/cm at the roller temperature from 10.degree. C. to 140.degree. C., and extusion coating the base paper with melted thermoplastic resin is proposed. The support produced by the process is superior in surface smoothness and glossiness. Upon using it for a recording material, excellent image with less unevenness can be obtained without using heat calendering at excessively high temperature after the coating.Type: GrantFiled: September 5, 1996Date of Patent: June 9, 1998Assignee: Fuji Photo Film Co., Ltd.Inventors: Tadahiro Kegasawa, Kazuo Ozaki, Kunio Takahashi, Katsuhiko Takada
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Patent number: 5750200Abstract: An ink jet recording sheet comprising a support, at least one ink-receiving layer formed on the support, and a gloss-providing layer formed on the ink-receiving layer, said ink-receiving layer consisting essentially of a pigment and a binder, and said gloss-providing layer consisting essentially of a pigment and a synthetic polymer latex as a binder and having a glossy surface with a 75.degree. specular gloss of at least 25% as stipulated in JIS-Z8741, wherein at least 70 parts by weight in 100 parts by weight of the pigment in the gloss-providing layer are constituted by colloidal particles having an average particle size of at most 300 nm.Type: GrantFiled: August 16, 1996Date of Patent: May 12, 1998Assignee: Mitsubishi Paper Mills LimitedInventors: Susumu Ogawa, Hideaki Senoh, Masaru Andoh, Hideki Nomura
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Patent number: 5633041Abstract: The invention provides a method of making thermoplastic resin-coated paper which comprises coating a paper sheet with a liquid thermoplastic resin, passing the thermoplastic resin-coated paper sheet through a nip of a pressure roll and a thermally conductive medium to form a resin-medium interface, heating the interface to a temperature of from 35.degree. C. to 350.degree. C. for a nip time period of from 0.002 to 10 seconds and a pressure of from 17,500 to 1,750,000 Pa-m, cooling the interface to a temperature of -73.degree. to 32.degree. C. for a cooling time period of from 0.001 to 100 seconds, and separating the thermoplastic resin-coated paper from the medium.Type: GrantFiled: May 10, 1996Date of Patent: May 27, 1997Assignee: Eastman Kodak CompanyInventor: Eric E. Arrington
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Patent number: 5609686Abstract: An apparatus continuously smoothes a wet coating of magnetizable particles and binder on a moving flexible web. A first longitudinal end of a flexible film is held in contact with the wet coating on the substrate and is free to drag against the wet coating. The first longitudinal end is deflected toward the substrate along a line extending transversely between the first and second transverse ends. The amount of deflection is adjusted and varied during coating to adjust the radius of curvature of the deflection of the first longitudinal end. A smoothing bar or a cylindrical rod, with or without a sharp edge, can hold the flexible film in position. The deflection and adjustment can be performed by a screw. Alternatively, a cylindrical rod is used by itself.Type: GrantFiled: August 30, 1995Date of Patent: March 11, 1997Assignee: Minnesota Mining and Manufacturing CompanyInventors: Glen A. Jerry, Stephan F. Kistler, Joseph H. Lam, Scott D. Stenstrom
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Patent number: 5571564Abstract: An offset printing apparatus has a fluid-cooled nip roll which, in use, is placed in intimate contact with a hot, rapidly moving, endless printed and dried paper web so as to improve the cooling efficiency of the first downstream chill roll, permit the use of fewer chill rolls, and avoid condensate streaking. The apparatus takes the form of a nip roll specially designed to press the web into intimate contact with the first downstream chill roll while avoiding damage to the web, nip roll, or chill roll, and while avoiding ink picking by the web surface contacted by the nip roll. Employing the nip roll in the system also permits the use of a substantially shorter dryer and fewer chill rolls as compared to a conventional system operating at the same web speed. The coolant circuit for the nip roll includes a warmup loop which temporarily circulates warm fluid through the nip roll when the system is first taken off-line, thereby preventing condensate formation or frost formation on the nip roll.Type: GrantFiled: September 27, 1995Date of Patent: November 5, 1996Assignee: Advance Systems, Inc.Inventors: Randall D. Helms, Daniel J. Hansen
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Patent number: 5567473Abstract: The invention provides photographic paper having increased image stability. The invention is generally accomplished by forming a paper sheet, drying said paper in a first stage to below about 10 percent water, then applying a polyvinyl alcohol solution to both sides of said paper sheet, drying said paper in a second stage to below about 5 percent water, and then applying further polyvinyl alcohol solution to said paper and drying in a third stage. The paper then may be coated to form a silver halide photosensitive color paper. The paper contains between about 4 and about 6 weight percent of polyvinyl alcohol that is concentrated near the surface of said paper. Further, the paper has a oxygen leak rate of less than about 25 cc/m.sup.2 /day and an oxygen GTR rate of less than about 1 cc/m.sup.2 /day.Type: GrantFiled: January 24, 1995Date of Patent: October 22, 1996Assignee: Eastman Kodak CompanyInventors: David J. Lacz, Todd R. Skochdopole, Larry D. Hagemeier, Anita M. Fees, Brian Thomas, Gary J. McSweeney
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Patent number: 5549928Abstract: A process for making an absorbent structure having a capillary substrate and regions of osmotic absorbent on the capillary substrate. The osmotic absorbent is cured from a liquid precursor applied to the capillary substrate. The capillary substrate has regions of topographically different elevations, taken normal to the plane of the capillary substrate. The capillary substrate is passed through a gap between a transfer roll and an anvil roll in a printing apparatus. The transfer roll has at liquid precursor on its periphery. The liquid precursor is applied to only the topographically elevated regions of the capillary substrate which contact the periphery of the transfer roll. By changing the topography of the capillary substrate, the liquid precursor can be applied to the capillary substrate in different pattern, without changing the transfer roll.Type: GrantFiled: May 15, 1995Date of Patent: August 27, 1996Assignee: The Procter & Gamble CompanyInventors: Paul D. Trokhan, Dean V. Phan
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Patent number: 5520958Abstract: A system and method are provided for applying a desired protective finish to a web of printed label stock. The web of printed label stock is moved through a coating station, where a layer of hot melt varnish is extruded onto the web of printed label stock. Then, the web of printed label stock is transferred to a working station in an environment which causes the layer of varnish to at least partially solidify to a predetermined state as it reaches the working station. At the working station, the layer of varnish is worked to a desired finish. Preferably the web is carried through a nip formed by a pair of rolls, including a highly polished chrome roll which contacts the layer of varnish and works the layer of varnish to a glossy finish. After the layer of varnish is worked to a glossy finish, the web is directed through a finishing station, where the glossy finish is fixed in the layer of varnish, and the web is conditioned to a state in which it can be processed as a web of finished label stock.Type: GrantFiled: December 22, 1994Date of Patent: May 28, 1996Assignee: Nordson CorporationInventors: Eric J. Doesburg, Marc L. Zirkle
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Patent number: 5418008Abstract: The present invention relates to a method and apparatus for producing paperboard packaging blanks (trays, lids, cartons, or combinations) in which the application of the barrier coating is combined with the printing of the sales graphics in a single-pass operation which eliminates the need for a separate off-line coating operation.Type: GrantFiled: September 21, 1994Date of Patent: May 23, 1995Assignee: Westvaco CorporationInventor: Barry G. Calvert
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Patent number: 5397601Abstract: The invention relates to a method and device in a size press in which a nip is formed by a pair of rolls. A paper or board web is passed through the nip. The rolls are provided with surface-sizing units for applying films of size or coating agent onto faces of the rolls. Each surface-sizing unit comprises an application zone defined by a coating member, a front edge of the application zone and a feed chamber. The coating agent, such as a size, is fed, through holes or corresponding nozzles that have been formed into a wall of a feed pipe, into the feed chamber under pressure out of the feed pipe which is arranged transverse to the machine direction. The coating agent is fed out of the feed chamber into the application zone through a throttle placed between the feed chamber and the application zone. The throttle comprises a perforated plate or equivalent which extends across the width of the machine and which is detachably fixed to the frame constructions of the surface-sizing unit by fastening members.Type: GrantFiled: January 29, 1993Date of Patent: March 14, 1995Assignee: Valmet Paper Machinery, Inc.Inventor: Ville Korhonen
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Patent number: 5393566Abstract: Recyclable containers such as corrugated or folding boxes are made from a coated paper or kraft grade sheet including a plastic coating thereon. Aqueous acrylic resin containing compositions can be applied in excess on the paper or kraft grade sheet and the unwanted coating metered and removed by directing a jet of air at the coating. After solidification of the coating, the coated paper or kraft sheets can be incorporated as components of corrugated or folding boxes. Recovery of the unwanted coating permits recycling of the coating component. Corrugated and folding boxes including the components can be recycled by conventional repulping processes. A process of manufacture of the coated sheets is also disclosed.Type: GrantFiled: October 27, 1992Date of Patent: February 28, 1995Assignee: Tim-Bar CoprorationInventor: Charles Propst
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Patent number: 5378497Abstract: The method comprises the application of a liquid film to a paper or paperboard rawstock web in a controlled and uniform manner to achieve a moisture gradient in the Z-direction thickness of the web to a depth of less than about one-half of the web thickness, and then pressing the treated web in at least one nip of a calender device before drying the web. The liquid application plasticizes only the surface fibers of the web so that the paper fibers at or near the surface become deformed and bonded under pressure to achieve a substantially irreversible smoothness upon being rewetted in a coating application or the like.Type: GrantFiled: February 10, 1993Date of Patent: January 3, 1995Assignee: Westvaco CorporationInventors: Dean R. Johnson, Hans W. Maurer