EP1987110A2 - Procédé de traitement d'un substrat - Google Patents

Procédé de traitement d'un substrat

Info

Publication number
EP1987110A2
EP1987110A2 EP07751498A EP07751498A EP1987110A2 EP 1987110 A2 EP1987110 A2 EP 1987110A2 EP 07751498 A EP07751498 A EP 07751498A EP 07751498 A EP07751498 A EP 07751498A EP 1987110 A2 EP1987110 A2 EP 1987110A2
Authority
EP
European Patent Office
Prior art keywords
coating
product
substrate
film
less
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07751498A
Other languages
German (de)
English (en)
Other versions
EP1987110A4 (fr
Inventor
Gary P. Fugitt
Scott E. Ginther
John W. Stolarz
Robert W. Carlson
Stanley H. Mcgrew Jr.
Steven P. Metzler
Terrell J. Green
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WestRock MWV LLC
Original Assignee
Meadwestvaco Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Meadwestvaco Corp filed Critical Meadwestvaco Corp
Publication of EP1987110A2 publication Critical patent/EP1987110A2/fr
Publication of EP1987110A4 publication Critical patent/EP1987110A4/fr
Withdrawn legal-status Critical Current

Links

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
    • D21H19/10—Coatings without pigments
    • D21H19/12—Coatings without pigments applied as a solution using water as the only solvent, e.g. in the presence of acid or alkaline compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J103/00—Adhesives based on starch, amylose or amylopectin or on their derivatives or degradation products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D101/00—Coating compositions based on cellulose, modified cellulose, or cellulose derivatives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
    • 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
    • D21H19/66—Coatings characterised by a special visual effect, e.g. patterned, textured
    • D21H19/70—Coatings characterised by a special visual effect, e.g. patterned, textured with internal voids, e.g. bubble coatings
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod
    • D21H25/14—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod the body being a casting drum, a heated roll or a calender

Definitions

  • the present disclosure relates to a method for treating a substrate with a polymer film-forming composition. More particularly, the disclosure relates to a paper or paperboard manufacturing method comprising the steps of applying a polymer film-forming coating to a substrate, and, bringing the polymer coating into contact with a heated surface while the polymer coating is still in a wet state. The resulting polymer layer has a smooth surface with voids (e.g., bubbles) just below the surface.
  • the polymer coating may comprise a crosslinkable hydrogel, and a crosslinking solution may be applied to the polymer coating on the substrate surface thereby forming at least a partially crosslinked polymer coating then placed into contact with a heated surface.
  • the present disclosure also relates to a treated substrate product.
  • Paper is manufactured by an essentially continuous production process wherein a dilute aqueous slurry of cellulosic fiber flows into the wet end of a paper machine and a consolidated dried web of indefinite length emerges continuously from the paper machine dry end.
  • the wet end of the paper machine comprises one or more headboxes, a drainage section and a press section.
  • the dry end of a modern paper machine comprises a multiplicity of • steam heated, rotating shell cylinders distributed along a serpentine web traveling route under a heat confining hood structure.
  • the screen is constructed and driven as an endless belt carried over a plurality of support rolls or foils.
  • a pressure differential across the screen from the side in contact with the .slurry to the opposite side draws water from the slurry through the screen while that section of the screen travels along a table portion of the screen route circuit.
  • the fibrous constituency of the slurry accumulates on the screen surface as a wet but substantially consolidated mat.
  • the mat Upon arrival at the end of the screen circuit table length, the mat has accumulated sufficient mass and tensile strength to carry a short physical gap between the screen and the first press roll.
  • This first press roll carries the mat into a first press nip wherein the major volume of water remaining in the mat is removed by roll nip squeezing.
  • One or more additional press nips may follow.
  • the mat continuum now generally characterized as a web, enters the dryer section of the paper machine to have the remaining water removed thermodynamically.
  • Coated paper or paperboard used for printing and for packaging is generally required to have high level of gloss, excellent smoothness, and excellent printability, as well as certain strength and stiffness characteristics.
  • the coated paper or paperboard has a high stiffness, it can pass smoothly through high-speed printing or packaging machines with less feeding jams.
  • Higher stiffness paper can be advantageously used in books, magazines, and catalogues, because it provides a feel of hardness or heaviness similar to a hardcover book.
  • high stiffness is necessary for maintaining the structural integrity of the paperboard product during filling and in subsequent use.
  • Stiffness has close relationship to the basis weight and density of paper. There is a general trend that stiffness increases as the basis weight increases, and decreases as the paper density increases. Stiffness and other properties can be improved by increasing basis weight. However, this would result in a product utilizing more fibers, which add cost and weight. Therefore, coated paper or paperboard with high stiffness but moderate basis weight is desirable. Paper with moderate basis weight is also more economical because less raw material (fiber) is utilized, hi addition, shipping costs based on weight are less for low basis weight paper.
  • coated paper or paperboard which must be printed is often required to have high gloss and smoothness.
  • density typically must be increased to some extent to allow for a usable printing surface.
  • Smoothness is normally achieved by calendering.
  • calendering will cause a reduction in caliper, which typically results in a corresponding reduction in stiffness.
  • the calendering process deteriorates the stiffness of paper by significantly reducing caliper and increasing the density.
  • the base sheet for conventional coated board grades typically is heavily densified by calendering to provide a surface roughness low enough to produce final coated smoothness acceptable to the industry.
  • These calendering processes, including wet stack treatment may increase density by as much as 20% to 25%.
  • the relationship between gloss and stiffness and between smoothness and stiffness are generally inversely proportional to each other, for a given amount of fiber per unit area.
  • Packaging grades are sold based on caliper, so manufacturing processes that reduce the caliper (increasing the density of the board) decrease the selling price. Processes that cause less caliper reduction save material costs.
  • the conventional method for making a 10-point board requires the use of a board having a thickness of greater than 12 points prior to calendering. It would be desirable to be able to produce a finished board having approximately the same thickness as the starting substrate.
  • Improvements in the calendering process including moisture gradient calendering, hot calendering, soft calendering, and belt calendering slightly improved stiffness for a given caliper but did not change the fundamental ratio between caliper, stiffness, smoothness, and printing properties.
  • a product in one embodiment, includes a substrate with a coating on the substrate.
  • the coating includes a water soluble polymer and a release agent. There are voids formed within the coating.
  • a product in another embodiment, includes a substrate with a coating on the substrate.
  • the coating includes a water soluble polymer and essentially no elastomeric material. There are voids formed within the coating.
  • a product in another embodiment, includes a substrate with a coating on the substrate.
  • the coating includes a surface, and the surface has a Sheffield Smoothness of less than about 300 units. There are voids formed under the surface of the coating.
  • a product in another embodiment, includes a substrate with a coating on the substrate.
  • the coating includes a water soluble polymer, a release agent, and essentially no elastomeric material.
  • the coating includes a surface, and the surface has a Sheffield Smoothness of less than about 300 units. There are voids formed under the surface of the coating.
  • a process is disclosed for treating a substrate. A wet film of aqueous polymer solution is applied to the substrate. The aqueous polymer solution is immobilized by bringing it into contact with a heated surface to cause the aqueous polymer solution to boil, and to at least partially dry the aqueous polymer solution.
  • a process for treating a substrate.
  • a wet film of aqueous polymer solution is applied to the substrate.
  • the aqueous polymer solution is immobilized by bringing it into contact with a heated surface to cause the aqueous polymer solution to boil and form voids that remain in the aqueous polymer solution, and to at least partially dry the aqueous polymer solution.
  • a process for treating a substrate.
  • a coating of aqueous polymer solution is applied to the substrate as a wet film.
  • the coating includes a water soluble polymer and a release agent.
  • the film is immobilized by bringing it into contact for less than about 3 seconds with a heated surface with a temperature above about 150 0 C so as to cause the aqueous polymer solution to boil and form voids in the film, and to at least partially dry the film.
  • a process for treating a substrate.
  • a coating of aqueous polymer solution is applied to the substrate as a wet film.
  • the coating includes a water soluble polymer and essentially no elastomeric material.
  • the film is immobilized by bringing it into contact for less than about 3 seconds with a heated surface with a temperature above about 150 0 C so as to cause the aqueous polymer solution to boil and form voids in the film, and to at least partially dry the film.
  • a process for treating a substrate.
  • a coating of aqueous polymer solution is applied to the substrate as a wet film.
  • the coating includes a water soluble polymer and essentially no elastomeric material.
  • the film is immobilized by bringing it into contact for less than about 3 seconds with a heated surface with a temperature above about 150 0 C so as to cause the aqueous polymer solution to boil and form voids in the film, and to at least partially dry the film.
  • the coating surface after drying has a Sheffield Smoothness of less than about 300 units.
  • a process is disclosed for treating a substrate.
  • a coating of aqueous polymer solution is applied to the substrate as a wet film.
  • the coating includes a water soluble polymer, a release agent, and essentially no elastomeric material.
  • the film is immobilized by bringing it into contact for less than about 3 seconds with a heated surface with a temperature above about 150 0 C so as to cause the aqueous polymer solution to boil and form voids in the film, and to at least partially dry the film.
  • the coating surface after drying has a Sheffield Smoothness of less than about 300 units.
  • a process for treating a cellulosic substrate.
  • a wet film of aqueous polymer solution is applied to the substrate.
  • the aqueous polymer solution includes at least about 60% water soluble polymer by dry weight, and up to 10% release agent by dry weight.
  • the aqueous polymer solution is immobilized by bringing it into contact for less than about 3 seconds with a heated surface with a temperature above about 150 0 C so as to cause the aqueous polymer solution to boil and form voids in the aqueous polymer solution, and to at least partially dry the aqueous polymer solution.
  • FIG. 1 is a schematic view of an apparatus for treating a substrate with a polymer coating in accordance with one embodiment of the present invention.
  • FIGs. 2 — 9 are cross section micrographs showing the morphology of samples made in accordance with one embodiment of the invention, and having a top coating.
  • FIGs. 10-12 are cross section micrographs showing the morphology of samples made in accordance with one embodiment of the invention.
  • FIGs. 13-14 are surface micrographs made by scanning electron microscope showing the morphology of samples made in accordance with one embodiment of the invention.
  • FIGs. 15-16 are surface micrographs made by backscatter scanning electron microscope showing the morphology of samples made in accordance with one embodiment of the invention.
  • FIG. 17 is a graph showing distribution of void dimensions in samples made in accordance with one embodiment of the invention.
  • the present disclosure relates to a method for treating a substrate with a polymer film-forming coating. More particularly, the disclosure relates to a paper or paperboard manufacturing method comprising the steps of applying a polymer coating to a substrate, and bringing the polymer coating into contact with a heated surface while the polymer coating is still in a wet state. Boiling of water in the polymer coating causes voids to form under the surface, but the surface of the film is smooth.
  • the paper or paperboard produced in accordance with certain embodiments of the present invention exhibits desirable levels of surface flatness and smoothness without significant densification of the base paper.
  • the polymer coating may include a crosslinkable material and a crosslinking solution may be applied to the polymer coating on the substrate surface thereby forming at least a partially crosslinked polymer film-forming composition.
  • the polymer coating may typically be applied to the web first and then the cross linking solution applied before the treated web contacts the heated surface.
  • weakly cross linking polymers it may be possible to provide the cross linking solution in the coating itself.
  • One advantage of treating a substrate with a polymer film-forming coating in accordance with the present invention relates to the improvement in smoothness and/or flatness that can be obtained without significantly increasing the density or decreasing the caliper of the sheet.
  • the heavy calendering of the cellulose paper web associated with conventional techniques is not required to produce a paper having print properties comparable to conventional coated papers.
  • much lower pressures can be applied to provide similar printing properties on papers with increased stiffness.
  • the cellulose paper web is smoothed such that the caliper decreases not more than about 7% and typically is decreased by between about 2% and 5%.
  • the cellulose paper web may be calendered to a Parker Print Surf smoothness of between about 2 and 6 microns prior to application of the polymer film.
  • substrates with higher Parker Print Surf values may be used.
  • a substrate with a Parker Print Surf smoothness of about 9 microns may be used.
  • Parker Print Surf smoothness is determined in accordance with TAPPI standard T 555 om-99. t
  • FIG. 1 illustrates an apparatus 10 useful in practicing certain embodiments of the invention.
  • a substrate 12 is subjected to treatment on one surface thereof with crosslinkable polymer coating 14 to form a layer of polymer coating 16 on substrate 12. While the polymer coating is still wet, an optional crosslinking solution 18 may be applied to the layer of polymer coating 16 thereby forming a cross linked polymer coating 20 on substrate 12.
  • the polymer coating 20 is typically at least partially crosslinked.
  • the polymer coating is still in a wet state before being brought into contact with hot polished drum 22 by pressing the web 12 against the drum surface with a press roll 24. Heat from the drum surface causes boiling within the wet polymer coating, so that voids form in the polymer under the surface.
  • the crosslinking solution causes the polymer coating to crosslink and gel into a substantially continuous layer or film. Typically, the resulting film will exhibit improved strength over the base sheet.
  • the polymer treated sheet may not be fully dried so it may be conveyed through a secondary heater 26. Any type of secondary heating device can be used that is capable of drying the treated sheet without adversely affecting the properties of the sheet.
  • the treated sheet emerges from secondary heaters 26 as a polymer film treated substrate 28 characterized by improved flatness and smoothness.
  • additional coating processes 30 and other processes such as coating, gloss calendering, etc) may be used to form a coated product 32.
  • the amount of wrap may depend on operating conditions such as web speed, moisture content of the polymer film forming composition 20, temperature of the drum, and other process factors. It is possible that a small amount of contact time with hot polished drum 22 may be sufficient. Besides providing the substrate in web form, it may also be provided in sheet form.
  • the crosslinkable polymer coating and the optional crosslinking solution may be applied by any number of techniques, such as dip-coating, rod coating, doctor blade coating, gravure roll coating, reverse roll coating, metered size press, smooth roll coating, extrusion coating, curtain coating, spray coating and the like.
  • the crosslinkable polymer coating and crosslinking solutions may be applied by the same coating technique or different methods may be used for each.
  • One embodiment in accordance with the present invention is based on the coagulation or gelling that occurs between polyvinyl alcohol and borax.
  • polyvinyl alcohol PVOH
  • a borax solution is an example of a corresponding crosslinker.
  • the crosslinker solution 16 is applied at a rate and solution solids to give a borax coverage of at least about 0.1 g/m 2 dry.
  • This wet, crosslinked polymer film 20 is then brought into contact with a hot polished drum 22 by pressing the web 12 against the drum surface with a press roll 24.
  • the drum surface temperature is at least about 150 0 C, or in accordance with certain embodiments, at least about 190 0 C so that the coating can be dried and release from the drum surface.
  • the contact time of the polymer film to the drum may be in the range of up to about 3.0 seconds, more particularly between about 0.5 — 2.0 seconds. This is sufficient time for the polymer film to immobilize and solidify, giving the surface of the polymer film a flat smooth finish mirroring the surface of the drum. Immobilizing the polymer film includes at least partially drying the film.
  • the coating is not necessarily completely dry when it leaves the drum, so additional drying 26 may be needed.
  • the web then continues on through the process and may receive additional coating layers, for example conventional coatings, prior to being wound up.
  • the polymer coating may be applied as a single layer or as two or more layers. Limited experiments also suggest that a polymer film may be immobilized or solidified with just momentary contact with the heated drum, as may be achieved by using a press roll 24 to press the web 12 against the hot drum 22, without any additional wrap of web around the hot drum. However, it is contemplated that some wrap of the hot drum may be practiced, and that optionally a felt 23 may be used to help press the web into contact with the hot drum. If a felt 23 is used to help press the web into contact with the hot drum, then the felt 23 may be carried between the press roll 24 and the heated drum 22.
  • crosslinkable polymers useful in certain embodiments of the present invention include crosslinkable hydrogels.
  • the following crosslinkable hydrogels are particularly useful: starch, waxy maize, protein, polyvinyl alcohol, casein, gelatin, soybean protein, and alginates.
  • One or more polymers selected from the above-recited ones can be used.
  • the crosslinkable polymer typically is applied in solution form and usually as an aqueous solution.
  • concentration of the polymer in solution is not particularly limited but can be easily determined by one of ordinary skill in the art. For example, a solution of about 20% starch may be used as described below.
  • the crosslinkable polymer may be applied to provide a surface coverage (dry basis) of from about 3 to about 15 gsm (g/m 2 ) more particularly from about 4 to about 8 gsm.
  • the crosslinkable polymer may be used in an amount ranging from about 60% to about 100% by weight of the dry materials.
  • crosslmkers include borates, aldehydes, ammonium salts, calcium compounds and derivatives thereof.
  • the crosslinker if used typically may be applied in solution form and usually as an aqueous solution.
  • concentration of the crosslinker in solution is not particularly limited but can be easily determined by one of ordinary skill in the art.
  • the crosslinker may be applied to provide a surface coverage (dry basis) of from about 0.1 to about 0.5 gsm more particularly from about 0.2 to about 0.3 gsm.
  • the temperature of the heated surface is in excess of that typically used for cast coating.
  • the higher temperature should allow for higher run speeds. It is anticipated that paper or paperboard produced in accordance with certain embodiments of the present invention may be produced at speeds in the range of about 750 to 3000 fpm, more particularly from about 1500 to 1800 ⁇ m.
  • the higher temperature and the dwell time are selected such that the coating composition is heated to its boiling temperature and it appears that when the coating boils there is an increase in contact area between the coating and the drum.
  • the increased contact results in a polymer film heated surface that exhibits improved smoothness and gloss.
  • the treated surface is ink receptive. Boiling of the coating as it is being smoothed on the polished drum surface appears to significantly improve gloss and smoothness of the finished polymer film treated substrate.
  • the polymer coating on the substrate is typically pressed against the heated surface for a sufficient period of time to allow the coating to boil and then set to a smooth, glossy finish.
  • the contact time of the forming polymer film to the drum is within the range of up to about 3.0 seconds, more particularly up to about 2.0 seconds, and most particularly up to about 0.5 seconds.
  • the polymer coating may also include one or more pigments.
  • useful pigments include, but are not limited to, kaolin, talc, calcium carbonate, calcium acetate, titanium dioxide, clay, zinc oxide, alumina, aluminum hydroxide and synthetic silica such as noncrystalline silica, amorphous silica or finely divided silica are examples thereof.
  • Organic pigments may also be used.
  • the crosslinkable polymer coating and/or the crosslinking solution may further include one or more release agents.
  • release agents include, without limitation, waxes, such as petroleum, vegetable, animal and synthetic waxes, fatty acid metal soaps, such as metal stearates, long chain alkyl derivatives, such as fatty esters, fatty amides, fatty amines, fatty acids, and fatty alcohols, polymers, such as polyolefins, silicone polymers, fluoropolymers, and natural polymers, fluorinated compounds, such as fluorinated fatty acids and combinations thereof.
  • waxes such as petroleum, vegetable, animal and synthetic waxes
  • fatty acid metal soaps such as metal stearates
  • long chain alkyl derivatives such as fatty esters, fatty amides, fatty amines, fatty acids, and fatty alcohols
  • polymers such as polyolefins, silicone polymers, fluoropolymers, and natural polymers, fluorinated compounds
  • the coating may contain from about 0.3 to 10 percent release agent, more particularly from about 2 to 5 percent by weight.
  • release agent may be sprayed onto the coating surface, or applied to the heated drum surface. If a non-sticking surface can be provided on the heated drum, whether by a release agent or other means, then application of a release agent in the coating or onto the coating surface may not be needed.
  • the polymer coating employed in certain embodiments of the present invention wherein at least the aforementioned polymer is contained, is generally prepared in the form of an aqueous composition.
  • An appropriate ratio between those ingredients is different depending on the polymer composition, the application conditions and so on, but it has no particular limitation as far as the treated paper produced can satisfy the quality required for the intended use thereof.
  • the polymer coating according to certain embodiments of the present invention can optionally contain additives, such as a dispersant, a water retaining agent, a thickening agent, an anti-foaming agent, a preservative, a colorant, a waterproofing agent, a wetting agent, a drying agent, an initiator, a plasticizer, a fluorescent dye, an ultraviolet absorbent, a release agent, a lubricant and a cationic polyelectrolyte.
  • additives such as a dispersant, a water retaining agent, a thickening agent, an anti-foaming agent, a preservative, a colorant, a waterproofing agent, a wetting agent, a drying agent, an initiator, a plasticizer, a fluorescent dye, an ultraviolet absorbent, a release agent, a lubricant and a cationic polyelectrolyte.
  • the substrate is treated with the polymer coating near a central region of the paper machine, such as the size press position.
  • the apparatus for applying the polymer coating to the substrate may be positioned relative to the paper machine so as to apply the polymer film to either surface of the forming paper web. More than one apparatus may be employed to apply a polymer film to each side of the forming paper web.
  • the base sheet is typically formed from fibers conventionally used for such purpose and, in accordance with the particular embodiments, includes unbleached or bleached kraft pulp.
  • the pulp may consist of hardwood or softwoods or a combination thereof.
  • the basis weight of the cellulose fiber layer may range from about 30 to about 500 gsm, and more particularly, from about 150 to about 350 gsm.
  • the hase sheet may also contain organic and inorganic fillers, sizing agents, retention agents, and other auxiliary agents as is known in the art.
  • the final paper product can contain one or more cellulose-fiber layers, polymer film layers and, in accordance with certain embodiments, other functional layers.
  • the present invention in accordance with certain embodiments, provides one or two- sided coated paper or paperboard for printing or packaging whose Parker Print Surf smoothness value after the coating and finishing processes, when measured according to TAPPI paper and pulp test method No. 5A, is lower than about 2-3 microns.
  • the paper or paperboard described herein may further be provided with one or more additional coatings.
  • a top coating containing conventional components may be provided to improve certain properties of the paper or paperboard. Examples of such conventional components include pigments, binders, fillers and other special additives.
  • the top coating when present, may be applied at much lower coat weights than conventional coatings and yet provide similar print properties. Accordingly, the top coating weight may be about 4 to 9 gsm as a single coating layer or about 8 to 18 gsm as two coating layers.
  • conventional coated papers typically require about 10 to 20 gsm as a single coating layer or 18 to 30 gsm as two coating layers to provide comparable surface properties.
  • the paper or paperboard may also be coated on the side of the sheet having the non-treated surface.
  • a base sheet having a caliper of about 10 points, a Parker Print Surf (PPS) value of about 9 microns (10kg pressure with a soft backing) and a Sheffield smoothness of about 310 can be treated in accordance with certain embodiments of the present invention to provide a treated sheet having improved smoothness with only a minimal decrease in caliper.
  • the base sheet may be treated by applying a PVOH solution at approximately 25% solids to the base sheet to provide a coverage of about 5 g/m 2 dry.
  • the crosslinker solution may be applied at a rate and solution solids to give a borax coverage of at least about 0.1 g/m 2 dry.
  • the wet, crosslinked polymer film can be brought into contact with a hot polished drum by pressing the sheet against the drum surface.
  • the drum surface temperature may be at least about 190 0 C.
  • the coating would be dried and released from the drum surface.
  • the contact time of the polymer film to the drum would typically be in the range of between about 0.5 - 2.0 seconds.
  • the treated sheet would have a caliper of between about 9.6 and 10.0 points, a PPS value of about 2.4 to 3.0 and a Sheffield smoothness of about 140 - 170.
  • a starch solution may be used as the polymeric material in the polymer coating.
  • the method includes applying a polymer coating comprising a crosslinkable hydrogel to a substrate, applying a crosslinking solution to the polymer coating on the substrate surface thereby forming at least a partially crosslinked polymer film-forming coating and bringing the polymer film-forming coating into contact with a heated surface while the polymer film-forming coating is still in a wet state.
  • the heated surface may be a hot polished drum having a flat smooth finish.
  • the temperature of the heated surface typically is within a range of from about 150 0 C to about 24O 0 C. Higher temperatures may be used, for example up to about 300 0 C.
  • the temperature of the heated surface in accordance with certain embodiments is within a range of from 180 0 C to about 200 0 C, and in accordance with certain embodiments is at least about 190 0 C.
  • the crosslinkable polymer may be selected from the group consisting of starch, waxy maize, protein, polyvinyl alcohol, casein, gelatin, soybean protein, and alginates.
  • the crosslinkable polymer may be used in amounts ranging from about 60 to about 100% by weight of the dry materials.
  • the crosslinker may be a borate or borate derivative such as borax, sodium tetraborate, boric acid, phenyl boronic acid, or butyl boronic acid.
  • the crosslinker may be used in amounts ranging from about 1 to about 12% based on the crosslinkable polymer.
  • the present invention is also directed to treated papers produced in accordance with the method described herein.
  • the treated papers are characterized by improved smoothness in conjunction with relatively minor increases in density compared to the original sheet.
  • the coating may be moistened for example by applying water.
  • One method is to spray water onto the coating before it contacts the hot drum.
  • starch may be used as the soluble polymer.
  • starch-based coatings can be run successfully without a crosslinker, and good results may be obtained without gelling (also called coagulating).
  • a starch solution containing 2-5% of a release agent was brought into contact with a heated drum under conditions described above. In certain conditions, if moistening of the coating is desired, water alone may be used as the spray and yield a good reproduction of the polished surface. If the coating solids are low enough, the process works without a moistening water spray. A 20% solids starch coating was applied to the web and brought into contact with a heated drum, and gave good reproduction.
  • Starch coatings were also tested having 25% and 30% solids. Both of these coatings released from the drum without any sticking, but without good surface reproduction. The 25% solids coating gave moderate reproduction, but the 30% solids coating was not very smooth. It appears that a certain amount of water present at the surface may help to propagate boiling throughout the entire coating. Below a certain amount of surface water, localized surface areas may still have sufficient boiling to give good reproduction of the drum surface, but other surface areas do not. Thus, without moistening of the surface with a water spray, as solids increase above 20%, the percentage of the area that reproduces the smooth drum surface decreases with increasing coating solids, until at about 30% coating solids, little or no surface smoothness reproduction is achieved.
  • a run consists of the drum being heated to approximately 19O 0 C, the spray level being set, coating being applied to the web by a metered rod method, optionally followed by moistening spray (which optionally may contain a cross linking agent), and then by the web being brought into contact with the drum at 35 fpm.
  • the drum temperature during a run varied between 180 0 C and 190 0 C.
  • the only variable that was changed was the coating weight applied by the metering rod.
  • Coat weight was measured by differential weight and is reported as bone-dry.
  • a minimally pressed base sheet with a basis weight of 111 lb/3000 ft 2 was used as a substrate on which to apply and treat simple coating compositions.
  • the first coating was 95% by dry weight CELVOL 203S polyvinyl alcohol (PVOH) and 5% Emtal 50 VCS, a triglyceride used as a release agent.
  • the coating solids were 20% by weight.
  • the coating was applied by a metering rod.
  • the Table is a list of samples and test conditions. Sample 1.1 was made by spraying the coating with a crosslinking solution containing 3% by weight borax and 1% by weight of a sulfonated castor oil as a release agent. The spraying rate was 48 milliliters per minute.
  • sample 1.2 replicated the drum well and released from the drum without sticking. Significant improvements in smoothness were obtained with minimal loss of caliper.
  • sample 1.2 the conditions were the same except that no borax was used in the spray solution. Without the borax to crosslink the polyvinyl alcohol, the coating did not release from the surface, and part of the film remained on the drum surface. This experiment clearly showed the benefit of crosslinking the polyvinyl alcohol.
  • CMC carboxymethyl cellulose
  • the carboxymethyl cellulose was FINFIXX 30, which could only be run at 7% solids due to coating viscosity.
  • the coating was formulated with 95% polymer and 5% Emtal.
  • Samples 1.3 and 1.4 are two different coat weights sprayed with 48 ml/min of borax spray. The coating replicated the drum surface well and released completely from the drum. Smoothness was improved with minimal loss of caliper, but smoothness was not as good as for polyvinyl alcohol.
  • Sample 1.5 no borax was used in the spray.
  • the coating replicated the drum surface well and released completely from the drum. Smoothness was improved by removing the borax. This showed that a non-crosslinked coating could replicate and release from the drum, which indicates that materials other than crosslmkable materials can be used in this process.
  • a minimally pressed base sheet having a basis weight of 111 lb/3000 ft 2 was used as a substrate on which to apply and treat simple coating compositions.
  • the first coating was 95% by dry weight CLEER-COTE 625 starch (a viscosity modified waxy corn starch) and 5% Emtal 50 VCS, a triglyceride used as a release agent.
  • the coating solids were 20% by weight.
  • the coating was applied by a metering rod.
  • Sample 2.1 was made by spraying the coating with a crosslinking solution containing 3% by weight borax and 1% by weight of a sulfonated castor oil as a release agent. The spraying rate was 46 milliliters per minute.
  • a conventional pigmented clay coating about two-thirds clay and one third carbonate, with a latex binder, applied in a single coat of approximately 10 Ib/ 3000ft 2
  • FIGs. 2 through 9 Micrographs revealed that voids exist in the polymer coating layer, as shown in FIGs. 2 through 9, which include measurement bars to indicate their scale.
  • the microscope magnification was 1000, and the measurement bars are 20 microns long.
  • the structure as shown includes a paperboard substrate 110.
  • the substrate thickness generally extends below the area of the micrograph. Because of the freeze fracturing process, the substrate 110 as shown in the micrographs is sometimes separated or partly separated from polymer layer 120. Therefore the upper boundary of substrate 110 may be only approximately shown by the bracketed distance denoting the substrate.
  • the polymer coating layer 120 had been applied onto substrate 110, and dried against a heated drum, as described previously. Then a top coating 130 was applied and dried.
  • the term "polymer coating” is used here to describe that layer applied as described above, then contacted while wet against a heated drum.
  • the term “top coating” is used to describe the outer layer, which was applied as one layer. Obviously the “top coating” could be applied in more than layer and could be of coating materials other than those used here.
  • Voids 121 are evident in the polymer coating layer 120, as seen in FIGs. 2-9.
  • FIG. 2 for example shows several voids 121 in polymer coating layer 120, with the voids appearing to be approximately 5 to 20 microns in lateral dimension. It is assumed that their size going "into” the fractured sample is in approximately the same range.
  • the voids typically appear to be somewhat “flattened” in the “vertical” direction, that is, going into the sample thickness.
  • the voids also appear to have "walls" that are relatively smooth, and generally thin. These thin walls are most apparent as seen between adjacent voids. Where a void wall is adjacent to the top coating 130, its thickness may be difficult to see but its presence may be deduced by the smooth lower contour of the top coating 130 adjacent to the void.
  • FIG. 3 is an example micrograph showing several voids 121 in the polymer coating layer. The voids appear to extend over an area equivalent to more than half the coated surface area. The polymer coating layer is not well defined in this micrograph.
  • FIG. 4 is an example micrograph showing several voids 121 in polymer coating layer 120.
  • the walls of the voids appear to be relatively thin, as evidenced by a somewhat translucent appearance in the walls of two of the voids.
  • FIG. 5 shows several voids 121 in polymer layer 120, with individual measurement bars showing dimensions of the selected voids, for example, moving generally from left to right, measurements of 10.5 microns in vertical distance, 36 microns in lateral distance, 10.6 microns in vertical distance, and 36.3 microns in lateral distance. Again the voids appear to extend over an area equivalent approximately half the coated surface area.
  • FIG. 6 shows another sample with similar measurement bars, for example, moving generally from left to right, measurements of 8.66 microns in vertical distance, 32.1 microns in lateral distance, 11.8 microns in vertical distance, and 22.7 microns in lateral distance. Measurements such as these in FIGs. 5 and 6 were collected for use " in the graph discussed later in FIG. 17.
  • FIG. 7 shows voids 121 in polymer layer 120, including several showing a generally flattened aspect. The voids appear to extend over an area equivalent to nearly all the coated surface area.
  • FIG. 8 shows another sample with similar widespread voids 121. The wall areas of several voids are visible.
  • FIG. 9 shows yet another sample where the voids 121 appear to extend over an area equivalent to nearly all the coated surface area.
  • FIG. 10 shows the polymer layer 120, which contains voids 121 and has a very smooth outer surface.
  • the polymer layer is on paperboard substrate 110, and one of the cellulose fibers 112 is denoted.
  • the substrate thickness generally extends below the area of the micrograph.
  • FIGs. 11 and 12 show additional micrographs of samples that were polymer coated but not top-coated. Again the smoothness of the polymer layer 120 is evident, as are the underlying voids 121. The walls of the voids often coincide with the surface of the polymer coating.
  • FIG. 13 (at 20Ox magnification) and FIG. 14 (at 50Ox magnification) show the surface of samples as seen under a scanning electron microscope. These samples were not given top coating 130.'
  • the larger string-like structures 112 are cellulose fibers of the substrate 110.
  • the smaller cell-like structures 122 that appear as a fine network or mesh are individual voids in polymer layer 120.
  • the polymer layer here appears essentially transparent, except for the walls of the voids.
  • FIGs. 15 and 16 show the surface of samples as seen under a backscatter scanning electron microscope. These samples were not given top coating 130.
  • the larger string-like structures 112 are cellulose fibers of the substrate 110.
  • the smaller cell-like structures 122 that appear as a fine network or mesh are the walls of individual voids in polymer layer 120.
  • the polymer layer here appears essentially transparent, except for the walls of the voids. The voids appear to be distributed over the entire surface.
  • FIG. 17 is a graph showing the distribution of void sizes based on approximately 90 measurements each of void width (lateral dimension) and height (vertical dimension in the micrographs).
  • the measurements show an average void width (measured in the direction parallel to the thickness of the sample) of about 19 microns, with a standard deviation of about 9 microns.
  • the measurements show an average void height (measured in the direction going "into" the sample thickness) of about 10 microns, with a standard deviation of about 4 microns.
  • the conditions in the nip between press roll 24 and hot drum 22 may influence whether voids form in the polymer coating.
  • it may be necessary to adjust the nip loading for example, the PLI loading on the nip
  • the nip loading for example, the PLI loading on the nip
  • the polymer-coated paper or paperboard created by this process may be used wherever a smooth substrate or finished product is desired.
  • the polymer-coated paper or paperboard may be used as-is (e.g., as shown in FIGS. 10-16), or it may be used as a substrate for additional coatings or other treatments to be applied (for example the top coating 130 shown in FIGs. 2-9, or other coatings) thereon.
  • Additional finishing materials or processes may be applied to the polymer-coated paper or .paperboard, with or without additional coatings.
  • one or more additional coatings may be applied, as is typical with base coating, top coating, and triple coating of conventional paper or paperboard substrates.
  • Calendering processes may be applied, before or after optional additional coating.
  • one or more additional coatings may be applied, followed by a gloss calendering step.

Abstract

L'invention concerne un procédé servant à traiter un substrat. Selon un mode de réalisation de l'invention, ce procédé consiste à appliquer un revêtement polymère sur un substrat et à mettre le revêtement polymère encore à l'état humide en contact avec une surface chauffée. Le revêtement polymère peut optionnellement comprendre une matière réticulable, un agent de réticulation pouvant être utilisé pour favoriser la réticulation. Le revêtement polymère reproduit la surface chauffée. L'invention concerne également un produit fabriqué selon ce procédé et caractérisé en ce qu'il présente des vides sous la surface du revêtement.
EP07751498A 2006-02-23 2007-02-22 Procédé de traitement d'un substrat Withdrawn EP1987110A4 (fr)

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US77611406P 2006-02-23 2006-02-23
PCT/US2007/004742 WO2007100667A2 (fr) 2006-02-23 2007-02-22 Procédé de traitement d'un substrat

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EP1987110A2 true EP1987110A2 (fr) 2008-11-05
EP1987110A4 EP1987110A4 (fr) 2009-11-11

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CA2643891A1 (fr) 2007-09-07
CN101389727A (zh) 2009-03-18
JP2009527659A (ja) 2009-07-30
EP1987110A4 (fr) 2009-11-11
US20070295466A1 (en) 2007-12-27
RU2009104458A (ru) 2010-08-20
NO20083241L (no) 2008-10-14
KR20080087168A (ko) 2008-09-30
MY150737A (en) 2014-02-28
JP5254809B2 (ja) 2013-08-07
BRPI0707823A2 (pt) 2011-05-10
CN101389727B (zh) 2013-02-06
KR101023587B1 (ko) 2011-03-21
RU2436882C2 (ru) 2011-12-20
CA2643891C (fr) 2014-01-21
WO2007100667A3 (fr) 2007-12-13
WO2007100667A2 (fr) 2007-09-07

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