EP1633928B1 - Papier support de couche lisse compose de fibres non standard - Google Patents

Papier support de couche lisse compose de fibres non standard Download PDF

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Publication number
EP1633928B1
EP1633928B1 EP04755530A EP04755530A EP1633928B1 EP 1633928 B1 EP1633928 B1 EP 1633928B1 EP 04755530 A EP04755530 A EP 04755530A EP 04755530 A EP04755530 A EP 04755530A EP 1633928 B1 EP1633928 B1 EP 1633928B1
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EP
European Patent Office
Prior art keywords
base stock
fibers
accordance
pigment
support material
Prior art date
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Expired - Lifetime
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EP04755530A
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German (de)
English (en)
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EP1633928A2 (fr
Inventor
Gregg L. Brelsford
David B. Cason
Dean R. Johnson
Stephen C. Petro
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NewPage Corp
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NewPage Corp
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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
    • D21H19/72—Coated paper characterised by the paper substrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • B41M5/41—Base layers supports or substrates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • B41M5/42—Intermediate, backcoat, or covering layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
    • B41M5/504—Backcoats
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
    • B41M5/506—Intermediate layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • B41M5/42—Intermediate, backcoat, or covering layers
    • B41M5/426—Intermediate, backcoat, or covering layers characterised by inorganic compounds, e.g. metals, metal salts, metal complexes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • B41M5/42—Intermediate, backcoat, or covering layers
    • B41M5/44—Intermediate, backcoat, or covering layers characterised by the macromolecular compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5254—Macromolecular coatings characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
    • 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/16—Pure paper, i.e. paper lacking or having low content of contaminants
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/76—Photosensitive materials characterised by the base or auxiliary layers
    • G03C1/775—Photosensitive materials characterised by the base or auxiliary layers the base being of paper
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/76—Photosensitive materials characterised by the base or auxiliary layers
    • G03C1/775—Photosensitive materials characterised by the base or auxiliary layers the base being of paper
    • G03C1/79—Macromolecular coatings or impregnations therefor, e.g. varnishes
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/76—Photosensitive materials characterised by the base or auxiliary layers
    • G03C1/91—Photosensitive materials characterised by the base or auxiliary layers characterised by subbing layers or subbing means
    • G03C1/93—Macromolecular substances therefor

Definitions

  • THE PRESENT INVENTION relates to smooth base stock for high quality imaging, and, more particularly, to smooth base stock composed of nonstandard fibers.
  • Obtaining photo quality prints by conventional silver halide photography, ink jet printing, dye sublimation, thermal dye transfer, or other like methods is dependent upon the smoothness of the base stock forming the base material for such printing papers.
  • the base stock is typically comprised of cellulose fibers, upon the top and/or bottom side of which polyolefin or polyester films may be extruded or laminated.
  • An imaging coating is applied on top of the poly film on one or both sides. Examples of imaging coatings include photosensitive emulsions, water or pigment-based ink receptive layers, thermal dye-recording layers, or other specialty coatings appropriate for a given imaging method.
  • the smoothness of the base stock determines the appearance and surface uniformity of the final image.
  • Fibers can be thought of as hollow tubes with a characteristic length and cell wall thickness.
  • Fiber length and fiber wall thickness contribute to smoothness.
  • Softwood fibers are significantly longer than hardwood fibers; therefore, hardwood fibers are preferred when smoothness is a desired property.
  • Shorter fibers also contribute to better formation due to a lower tendency to flocculate and by their ability to pack together more tightly.
  • Fiber cell wall thickness will influence the compressibility or ability of fibers to flatten during drying and when compressed during densification. Fibers with thick cell walls are stiffer and resist collapse whereas fibers with thin cell walls are easily compressed and produce a dense, well-formed base stock.
  • Hardwood fibers with a thin cell wall also provide more fibers per gram, further contributing to formation and smoothness.
  • base stocks used for photographic quality papers typically are comprised of fibers that are short and/or have thin fiber cell walls.
  • the desired fiber length-weighted average as measured by a Kajaani fiber analyzer, has been described to be between 0.4 to 0.58 mm ( U. S. Pat. Nos. 6,391, 532 , 6, 364,997 , and 6,107, 014 ), equal to or less than 0.5 mm ( U. S. Pat. Nos. 5,250, 496 and 5,288, 690 ) or a length between 0.4 to 0.9 mm ( JP-A-61-69649 ).
  • US-A-5667900 discloses a heat resistant paper made of aramid fibres with an average fibre length of 6.8 mm and which, after hot-press calendering, had a roughness of less than 3 micro metres.
  • EP-A-0381196 discloses a photographic paper made from a wood pulp incorporating a polyolefin and which after machine calendering and soft calendering has a roughness between 0.57 and 0.69 micro metres.
  • the present invention provides a smooth base stock for high quality imaging.
  • a base stock comprising cellulose fibers and having a roughness of less than 2.0 micron Rg, characterised in that the fibers have a fiber length weighted average of greater than 0.9mm.
  • the base stock utilizes nonstandard fibers yet provides the smoothness and other physical properties required for high quality imaging.
  • the base stock comprises at least 50% of fibers having a population below 10 x 10 6 fibers per gram.
  • the base stock is preferably substantially free of filler pigments.
  • a method for producing a base stock for use in forming a recording material comprises the steps of providing a fiber slurry composed of cellulose fibers having a length weighted average fiber length above about 1 mm, forming a web of the fibers and subjecting the web to a smoothing operation to provide a base stock having a roughness of from about 1.2 micron Ra to about 1.5 micron Ra.
  • the method may also include a refining step wherein the fibers, after the refinement treatment, have a length-weighted average fiber length of above about 0.9mm.
  • a support material for an image forming system includes a base stock composed of cellulose fibers having a length weighted average of greater than about 0.9 mm and a roughness of from about 1.2 micron Ra to about 1.5 micron Ra and an image forming or image receptive coating layer on at least one side of the base stock wherein the image forming or image receptive coating is selected from the group consisting of a photosensitive emulsion, an ink jet receptive coating, a thermal dye recording layer and a pigment based ink receptive layer.
  • the support material further comprises a polyolefin or polyester coating layer disposed between the base stock and the image forming or image receptive coating layer on one or both sides of the support material.
  • nonstandard fibers refers to fibers that are not typically used for producing smooth, photo-quality papers. More specifically, nonstandard fibers are those having an unrefined average fiber length of greater than about 1.0 mm.
  • average fiber length refers to the length weighted average fiber length as determined with a suitable fiber length analysis instrument such as a Kajaani Model FS-200 fiber analyzer.
  • population refers to the number of fibers per gram.
  • the base stock of the present invention may be used in any image forming system in which a smooth base sheet is required to provide a high quality image.
  • it may be used in conjunction with photosensitive emulsions, water or pigment-based ink receptive layers, thermal dye-recording layers, or other specialty coatings appropriate for a given imaging method.
  • Base stock for papers that produce high quality images require exceptionally smooth surfaces.
  • Fiber used in the manufacture of these papers is generally natural cellulose fiber, but synthetic fiber may also be used.
  • the base stock can be produced on a Fourdrinier or cylinder paper machine. Achieving the desired level of smoothness is dependent on fiber characteristics, fiber treatment, and method of base stock densification.
  • the base stock of the present invention can include various additives as typically used in producing base stocks.
  • chemicals may be added to impart water resistance, wet or dry strength, and to achieve color and brightness targets, depending upon the final product application.
  • sizing agents, dry and wet strengthening agents, fillers, pH adjusters, pigments, dyes and fluorescent brighteners may be added.
  • the additives and amounts needed to obtain a base stock having the desired properties are known to those skilled in the art.
  • Fiber content analysis of a conventional photographic base stock gave the following wood species results: 34% eucalyptus, 24% maple, 23% aspen, 12% birch, 5% beech, and 2% ash. Unrefined fiber lengths of these species are presented.
  • the Eucalyptus family provides the shortest hardwood fiber available with an average fiber length as low as 0.65 mm. Maple is about 0.9 mm and aspen is about 1.0 mm. Other hardwood fiber species are greater than 1.0 mm in length.
  • Cell wall thickness of eucalyptus, maple, aspen, and birch is in the range of 3 to 4 micrometers.
  • Fiber content analysis for a base stock sample in accordance with a specific embodiment of the present invention gave the following wood species: 72% oak, 10% yellow poplar, 9% gum, 4% maple, the remainder being small amounts of other various hardwood species. Analysis of other samples of base stock in accordance with this aspect of the invention gave results that varied somewhat for percentages of species fibers present, but the predominant specie in all samples was oak, and the four species listed above comprised no less than 83% and generally more than 90% of the fiber in accordance with these embodiments of the invention. Unrefined fiber lengths are: oak is 1.25 mm, yellow poplar is 1.9 mm, and gum is 1.85 mm. Averaged fiber cell wall thickness for oak, yellow poplar, and gum is approximately 6.0 microns.
  • the fiber composition of the invention base stock is significantly different from the fiber composition described in the prior art as being essential for producing a smooth base stock necessary for photo quality images.
  • the present invention is directed to a base stock exhibiting the desired smoothness even though the fibers used are relatively long and typically considered as unsuitable for photo-quality paper.
  • the ability to use longer fibers is advantageous from a cost perspective as the longer fibers typically are less expensive than the short fibers used with conventional photo-quality papers.
  • Base stock in accordance with certain aspects of the present invention includes at least 50% nonstandard fibers, more particularly at least 80% nonstandard fibers and in certain embodiments at least 90% nonstandard fibers based on the total fiber content.
  • Fiber population is another measure of fiber properties indicative of the differences between fibers used in conventional base stocks for high image quality imaging and the fibers used in the present invention.
  • the population of conventional fibers typically is greater than about 10 x 10 6 fibers per gram.
  • the population for the majority of fibers used in the base stock of the present invention is less than about 10 x 10 6 fibers per gram, typically less than about 7 x 10 6 fibers per gram.
  • Base stock in accordance with certain aspects of the present invention includes at least 50% fibers having a population less than about 10 x 10 6 fibers per gram and more particularly at least 80% fibers having a population less than about 10 x 10 6 fibers per gram based on the total fiber content.
  • one important step relates to the refining process.
  • the fibers are refined prior to being pumped to the paper machine head box and formed into a paper web.
  • fibers that have been previously treated in the pulping and bleaching stages are passed through refiners where the fibers experience a high degree of shear to further change the characteristics of the fiber.
  • Refining can alter the characteristics of the fiber by increasing fiber surface area by fillibrating and by reducing fiber length.
  • specially designed refiners are used to reduce fiber length by employing a cutting action.
  • the refining treatment typically includes a combination of two refining methods.
  • the first step is disc refining which will fillibrate the fiber and cause some reduction in fiber length.
  • the second refining step utilizes a conical refiner or mixer to shorten or cut fibers as described in U.S. Pat. No. 6,107,014 .
  • the resulting conventional fiber mix has a preferred fiber length-weighted average between 0.4 and 0.58 mm.
  • References in the prior art for the manufacture of base stock for high quality images refer to a fiber length-weighted average equal to or less than 0.5 mm ( U.S. Pat. Nos.
  • the cutting refining step may be eliminated.
  • the refining treatment in accordance with certain aspects of the present invention results in base stock composed of a fiber mixture having a length-weighted average greater than about 0.9 mm.
  • the ability to provide a base stock having the desired smoothness while eliminating a refining step typically utilized in the prior art is another advantage obtained in accordance with certain aspects of the present invention.
  • the basis weight of the raw base paper will typically be from about 50 to about 250 g/m 2 , more particularly from about 100 to about 200 g/m 2 .
  • the present invention is not limited to these basis weights and could be applicable to lighter or heavier basis weight papers.
  • the base stock of the present invention can also be provided with a pigment coating to improve smoothness of the base stock, particularly for base stock used for imaging.
  • the pigment coating may include a binder present in the pigment coating composition at from about 8 to about 30 % by weight of the dry coating.
  • the pigment to binder ratio may range from about 100:15 to about 100:40, more particularly from about 100:20 to about 100:30.
  • the pigment coating composition of the present invention may include binders and pigments typically used in pigment coatings as would be known to those skilled in the art.
  • pigments that may be included in the pigment composition include, but are not limited to, calcium carbonate pigments, clay, titanium dioxide, aluminum silicate, magnesium silicate, magnesium carbonate, zinc oxide, talc, satin white, barium sulfate, calcium silicate, zinc hydroxide, etc.
  • binders examples include, but are not limited to, styrene-butadiene polymers, acrylic polymers, styrene-acrylic polymers, vinyl acetate and ethylenevinyl acetate polymers.
  • the binder used in the coating is an acrylic latex.
  • acrylic latexes include but are not limited to, acrylic esters, modified acrylic esters, acrylic ester co-polymers, and modified acrylic ester co-polymers.
  • useful binders include Rhoplex B-1 SP, Rhoplex P-554, and Rhoplex 60-A.
  • Rhoplex B15-P available from the Rohm and Haas company.
  • the binder is usually used in an amount of about 8% to 30% by weight, more particularly from about 15% to about 25% by weight, based on the total solids content of the coating. For some applications, the binder may be used in amounts ranging from about 20% to about 30% binder by weight.
  • the pigments useful in accordance with the present invention are not particularly limited and any pigments can be used which are suitable for the end use application of the coated paper.
  • the pigment coating contains pigments which are particularly useful in improving smoothness of the base stock.
  • pigments useful in accordance with this aspect of the present invention include, but are not limited to, anisotropic particles in the form of needle-shaped aragonite precipitated calcium carbonate, high-aspect-ratio clay, low bulk density pigment in the form of hollow sphere polystyrene pigment and combinations thereof.
  • a specific pigment formulation comprising a combination of these pigments is provided.
  • a pigment coating containing from about 10 to about 14% high aspect ratio clay, from about 18 to about 22% hollow sphere polystyrene pigment and from about 65 to about 75% aragonite precipitated calcium carbonate based on total pigment weight can be used to minimize surface roughness.
  • the present invention provides levels of smoothness that are not typically attained using prior art techniques.
  • a coated paper having a pigment coating containing from about 20 to about 30% of an acrylic binder, from about 40 to about 80% of aragonite precipitated calcium carbonate and from about 15 to about 25% hollow sphere polystyrene pigment by weight based on the dry pigment coating.
  • the base stock of the present invention may be used in any image forming system in which a smooth base sheet is required to provide a high quality image.
  • it may be used in conjunction with photosensitive emulsions, water or pigment-based ink receptive layers, thermal dye-recording layers, or other specialty coatings appropriate for a given imaging method.
  • a base stock produced in accordance with the present invention can be converted into photographic products or used to produce photographic ink jet products.
  • the pigment coating as described herein may be applied to the uncoated base stock using any conventional coating devices, such as a gate roll coater, a bill blade coater, an air knife coater, and the like.
  • the pigment coating will typically be applied to provide a coat weight of from about 6 to 22g/m 2 (4 to 15 lb/3300 ft 2 ), more particularly from about 12 to 15g/m 2 (8 to 10 lb/3300 ft 2 ).
  • final smoothness of the base paper (or coated paper) is generally achieved by subjecting the web (or coated paper) to various smoothing operations.
  • One particularly useful method involves a densification process known as calendering, during which a paper web is passed between nips formed by multiple rolls stacked upon one another, creating pressure to compress the paper and make it smoother.
  • the compression step is accomplished with a stack of four or more metallic rolls ( U.S. Pat. No. 5,060,565 ). In such a stack, the nip load and compression force increase in each successive nip from the top down due to the weight of the rolls and whatever additional load force is applied.
  • a process is described using a nip formed by two rolls of dissimilar material (i.e. metallic and a polymeric resin covered roll) followed by a nip formed by two metallic rolls.
  • This is a process used for production of standard base stocks as well.
  • the paper may be compressed by a succession of nips formed by either a polymeric resin covered roll and a metallic roll or by two metallic rolls. It is known in the art of calendering that a nip formed by a polymeric covered roll and a metallic roll will give improved fine scale smoothness to the web contacting the polymeric covered roll.
  • a nip formed by two metallic rolls will improve large to medium scale roughness resulting from paper formation-related roughness.
  • the smoothing operation involves passing the paper web through a plurality of nips in a calender stack wherein the first nips are formed by polymeric covered rolls adjacent to metallic rolls and the last two nips are formed by pairs of adjacent metallic rolls. Therefore, the fine scale smoothness is improved initially with the large and medium scale smoothness improved in the last two nips.
  • a means is employed to control nip pressures so calender roll weight and loading pressure are not the only factors in determining individual nip loads.
  • the described calendering sequence allows a high level of smoothness without a blackening effect that can occur when paper is calendered through multiple metallic nips.
  • Coated paper in accordance with the certain aspects of the present invention is advantageous due to the improvement in smoothness obtained using the described fibers and pigment coating composition.
  • Smoother papers provide images of higher quality in most image forming operations. Smoothness of photobase paper is particularly important for generating high quality images.
  • the surface roughness or Ra of the base stock or coated paper is a measure of relatively finely spaced surface irregularities on the paper. Ra represents the center line roughness of the base stock or finished paper. The surface roughness measurement provides an indication of the maximum variations over the surface of the paper. Lower Ra values indicate smoother base stock or coated paper.
  • the base stock is subjected to a smoothing operation to provide a base stock having a roughness of from about 1.2 micron Ra to about 1.5 micron Ra.
  • Calender loads typically range from about 1000 pli to about 1500 pli to produce base stock having the desired smoothness.
  • Ra represents the center line roughness of the base stock or finished paper. Ra is preferably 3.0 microns or less, more preferably 2.0 micron or less and most preferably 1.5 micron or less.
  • the base stock (or coated paper) is further coated with a polymeric resin layer on one or both sides of the base stock (or coated paper).
  • the polymer film is typically applied to the base stock by an extruding or laminating process although any method of coating the polymeric film to the base stock to provide a smooth surface can be used.
  • One or more coating layers of polymer can be applied to the base stock (or coated paper).
  • the polymers useful in accordance with this aspect of the invention are not particularly limited provided the polymer is capable of being extruded, laminated or coated onto the paper base stock.
  • Polyolefin resins typically are used in producing a photographic support to which a photosensitive emulsion is applied.
  • Polyolefin resins useful in forming the polyolefin resin layer include homopolymers of olefins such as low density polyethylene, high density polyethylene, polypropylene, polybutene, polypentene, copolymers of two or more olefins and mixtures thereof. Polymers of various densities and melt indices can be used. Polyester resins or films may also be used in producing a photographic support.
  • the polymer resin layer may also include other additives such as pigments, amides, metal salts of aliphatic acids, antioxidants, brighteners, ultraviolet absorbers, etc. Titanium dioxide is frequently added to the polymer resin layer to improve sharpness and image resolution.
  • U.S. Pat. No. 4,994,357 to Uno et al. describes various polyolefin coating compositions and the use of the compositions in producing photographic supports.
  • the polymer layer may be applied to provide a dry coat weight of from about 7 to 44g/m 2 (5 to about 30 lb/3300 ft 2 ) more particularly from about 22 to 37 g/m 2 (15 to about 25 lb/3300 ft 2 ).
  • the polymer layer can be extruded as a single layer or co-extruded as a multi-layer.
  • Base stock samples in accordance with particular embodiments of the invention were tested using a laser based UBM surface smoothness apparatus.
  • Roughness of typical photographic base stock and the invention base stock samples both measured in a range of 1.3 to 1.4 micron Ra.
  • Another surface measurement method using a stylus probe was also used.
  • the stylus method separates roughness components by size into three categories or length scales: R1, R2, and R3.
  • R1 represents the largest scale roughness and R3 the smallest "fine" scale roughness. For each roughness scale, a smaller R-value represents a smoother base paper.
  • Example 1 Standard Photo Base Stock - Comparative Species Percent Fiber length, mm (unrefined) Cell Wall Thickness, ⁇ m Population, Fibers per gram Eucalyptus 34 0.65 ⁇ 4 20 x 10 6 Maple 24 0.85 4.05 12.8 x 10 6 Aspen 23 1.05 3.20 11.9 x 10 6 Birch 12 1.51 3.75 7.6 x 10 6 Beech 5 1.16 5.60 7.6 x 10 5
  • Example 2 (Invention Base Stock) Species Percent Fiber length, mm (unrefined) Cell Wall Thickness, ⁇ m Population, Fibers per gram Oak 70 1.25 5.8 6.9 x 10 6 Yellow Poplar 10 1.95 ⁇ 6 1.9 x 10 6 Gum 8 1.85 6.32 2.2 x 10 6 Maple 3 0.85 4.05 12.8 x 10 6 Misc.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Paper (AREA)
  • Compounds Of Unknown Constitution (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)
  • Cosmetics (AREA)
  • Artificial Filaments (AREA)

Claims (28)

  1. Papier support comprenant des fibres de cellulose et ayant une rugosité inférieure à 2,0 micron Rg, caractérisé en ce que les fibres ont une longueur moyenne pondérée de fibre qui est supérieure à 0,9 mm.
  2. Papier support selon la revendication 1, dans lequel le papier support a une rugosité inférieure à 1,5 micron Ra.
  3. Papier support selon la revendication 2, dans lequel le papier support a une rugosité allant de 1,2 microns Ra à 1,5 microns Ra.
  4. Papier support selon la revendication 1, dans lequel le papier support comprend au moins 50%, rapportés à la teneur totale en fibres, de fibres ayant une longueur de fibre moyenne non raffinée supérieure 1,0 mm.
  5. Papier support selon la revendication 1, dans lequel le papier support comprend au moins 50% de fibres ayant une population inférieure à 10 x 106 fibres/gramme.
  6. Papier support selon la revendication 1, dans lequel le papier support est sensiblement dépourvu de pigments de charge.
  7. Procédé de production d'un papier support destiné à être utilisé dans la formation d'un matériau d'enregistrement, comprenant les étapes de :
    - fournir une pâte de fibres comprenant des fibres de cellulose formant un réseau de fibres ; et
    - soumettre le tissu à une opération de lissage pour donner un papier support ayant une rugosité inférieure à 2,0 microns Ra, caractérisé en ce que les fibres ont une longueur moyenne pondérée de fibre supérieure à 1 mm.
  8. Procédé selon la revendication 7, dans lequel le papier support a une rugosité inférieure à 1,5 microns Ra.
  9. Procédé selon la revendication 8, dans lequel le papier support a une rugosité allant de 1,2 microns Ra à 1,5 microns Ra.
  10. Procédé selon la revendication 7 comprenant en outre : le raffinage des fibres dans la pâte de fibres, les fibres ayant une longueur moyenne pondérée de fibre qui est supérieure à 0,9 mm après le traitement de raffinage.
  11. Procédé selon la revendication 10, dans lequel la pâte de fibres est essentiellement dépourvue de pigments de charge et le papier support résultant est sensiblement dépourvu de pigments de charge.
  12. Procédé selon la revendication 7 comprenant en outre : le revêtement du papier support sur au moins un de ses côté avec une composition de revêtement pigmentaire.
  13. Procédé selon la revendication 12, dans lequel ladite composition de revêtement pigmentaire comprend du carbonate de calcium précipité dans de l'aragonite, un pigment sphérique creux et un liant.
  14. Procédé selon la revendication 13, dans lequel le liant comprend un liant acrylique sélectionné dans le groupe constitué d'esters acryliques, d'esters acryliques modifiés, de copolymères d'esters acryliques, de copolymères d'esters acryliques modifiés et de mélange de ceux-ci.
  15. Procédé selon la revendication 14, dans lequel ladite composition de revêtement pigmentaire comprend de 20 à 30% de liant acrylique, de 15 à 25% de pigment sphérique creux et de 40 à 80% de carbonate de calcium précipité dans de l'aragonite, rapportés au poids sec de la composition de revêtement pigmentaire.
  16. Matériau de support pour système de formation d'images comprenant :
    un papier support selon la revendication 1 et une couche de revêtement de réception d'images ou de formation d'images sur au moins un côté du papier support, dans lequel le revêtement de réception d'images ou de formation d'images est sélectionné dans le groupe constitué d'une émulsion photosensible, d'un revêtement de réception de jets d'encre, d'une couche d'enregistrement à colorant thermique et d'une couche de réception d'encre à base de pigments.
  17. Matériau de support selon la revendication 16, dans lequel le matériau de support comprend en outre un revêtement de pigment comprenant un pigment et un liant sur au moins un côté du papier support, formant ainsi un papier revêtu de pigment.
  18. Matériau de support selon la revendication 17, dans lequel le matériau de support comprend en outre une couche de revêtement polymère placée entre le revêtement de pigment sur le papier support revêtu et la couche de revêtement de réception d'images ou de formation d'image sur un côté ou les deux côtés du matériau de support.
  19. Matériau de support selon la revendication 18, dans lequel la couche de revêtement polymère comprend une couche de revêtement polyoléfine ou polyester.
  20. Matériau de support selon la revendication 18, dans lequel le poids du revêtement de pigment va de 6 à 22 grammes par mètre carré (4 à 15 livres pour 3300 pieds carrés).
  21. Matériau de support selon la revendication 20, dans lequel le revêtement de pigment comprend de 40 à 80% de carbonate de calcium précipité dans de l'aragonite et de 15 à 25% de pigment sphérique creux en poids sec rapporté au revêtement total de pigment.
  22. Matériau de support selon la revendication 21, dans lequel le revêtement de pigment comprend en outre de 20 à 30% d'un liant acrylique rapporté au revêtement total de pigment.
  23. Matériau de support selon la revendication 20, dans lequel le revêtement de pigment comprend en outre un liant présent dans la composition de revêtement de pigment allant de 8 à 30% en poids du revêtement de pigment sec.
  24. Matériau de support selon la revendication 21, dans lequel le revêtement de pigment est essentiellement dépourvu d'argile.
  25. Matériau de support selon la revendication 18, dans lequel le papier support a une rugosité inférieure à 1,5 microns Ra.
  26. Matériau de support selon la revendication 25, dans lequel le papier support a une rugosité allant de 1,2 microns Ra à 1,5 microns Ra.
  27. Matériau de support selon la revendication 18, dans lequel le papier support comprend au moins 50%, rapportés à la teneur totale en fibres, de fibres ayant une longueur de fibre moyenne non raffinée supérieure à 1,0 mm.
  28. Matériau de support selon la revendication 18, dans lequel le papier support comprend au moins 50% de fibres avec une population inférieure à 10 x 106 fibres/gramme.
EP04755530A 2003-06-17 2004-06-17 Papier support de couche lisse compose de fibres non standard Expired - Lifetime EP1633928B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US47911903P 2003-06-17 2003-06-17
PCT/US2004/019406 WO2004113610A2 (fr) 2003-06-17 2004-06-17 Support de couches lisse compose de fibres non standards

Publications (2)

Publication Number Publication Date
EP1633928A2 EP1633928A2 (fr) 2006-03-15
EP1633928B1 true EP1633928B1 (fr) 2009-03-11

Family

ID=33539151

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04755530A Expired - Lifetime EP1633928B1 (fr) 2003-06-17 2004-06-17 Papier support de couche lisse compose de fibres non standard

Country Status (5)

Country Link
EP (1) EP1633928B1 (fr)
JP (1) JP2007520642A (fr)
AT (1) ATE425306T1 (fr)
DE (1) DE602004019918D1 (fr)
WO (1) WO2004113610A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7906218B2 (en) 2004-11-30 2011-03-15 Hewlett-Packard Development Company, L.P. System and a method for inkjet image supporting medium
JP6744672B1 (ja) 2019-05-20 2020-08-19 株式会社Ｔｂｍ 印刷用シート及び印刷用シートの製造方法
JP6738107B1 (ja) 2019-07-08 2020-08-12 株式会社Ｔｂｍ 印刷用シート及び印刷用シートの製造方法

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Publication number Priority date Publication date Assignee Title
JPH02203335A (ja) * 1989-01-31 1990-08-13 Fuji Photo Film Co Ltd 写真印画紙用支持体
JP2580042B2 (ja) * 1989-07-18 1997-02-12 新王子製紙株式会社 染料熱転写画像受容シート
US5250496A (en) * 1992-01-17 1993-10-05 Eastman Kodak Company Receiving element with cellulose paper support for use in thermal dye transfer
JP2676291B2 (ja) * 1992-02-26 1997-11-12 日本製紙株式会社 電子写真用転写紙
US5667900A (en) * 1993-01-04 1997-09-16 E. I. Du Pont De Nemours And Company Aramid paper with high surface smoothness
JP2938380B2 (ja) * 1995-10-09 1999-08-23 日本製紙株式会社 インクジェット記録用紙及びその製造方法
JP3463839B2 (ja) * 1995-10-09 2003-11-05 三菱製紙株式会社 写真印画紙用支持体およびその製造方法
JPH09114044A (ja) * 1995-10-16 1997-05-02 Mitsubishi Paper Mills Ltd 写真印画紙用樹脂被覆紙
JPH1072796A (ja) * 1996-06-27 1998-03-17 Oji Paper Co Ltd 印刷用両面塗被紙
JPH10315613A (ja) * 1997-05-19 1998-12-02 Mitsubishi Paper Mills Ltd インクジェット記録シート
JPH11271928A (ja) * 1998-03-19 1999-10-08 Mitsubishi Paper Mills Ltd 画像材料用支持体およびその製造方法
JP2000039686A (ja) * 1998-07-23 2000-02-08 Mitsubishi Paper Mills Ltd 画像材料用支持体
JP2001347748A (ja) * 2000-06-09 2001-12-18 Konica Corp インクジェット記録用紙
JP2002067474A (ja) * 2000-08-31 2002-03-05 Konica Corp インクジェット記録方法
JP3870762B2 (ja) * 2000-11-29 2007-01-24 王子製紙株式会社 光学読み取り用用紙
CA2377775A1 (fr) * 2002-03-18 2003-09-18 Gilles Bouchard Procede de fabrication de papier couche de grades cfs#3, cfs#4 et cgw #4 a partir de pate thermomecanique a bas indice d'egouttement et a haute blancheur

Also Published As

Publication number Publication date
EP1633928A2 (fr) 2006-03-15
JP2007520642A (ja) 2007-07-26
WO2004113610A3 (fr) 2005-08-18
DE602004019918D1 (de) 2009-04-23
ATE425306T1 (de) 2009-03-15
WO2004113610A2 (fr) 2004-12-29

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