EP0623070B1 - Papier synthetique polymere recyclable et procede pour sa fabrication - Google Patents

Papier synthetique polymere recyclable et procede pour sa fabrication Download PDF

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Publication number
EP0623070B1
EP0623070B1 EP93903587A EP93903587A EP0623070B1 EP 0623070 B1 EP0623070 B1 EP 0623070B1 EP 93903587 A EP93903587 A EP 93903587A EP 93903587 A EP93903587 A EP 93903587A EP 0623070 B1 EP0623070 B1 EP 0623070B1
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EP
European Patent Office
Prior art keywords
fibers
web
synthetic paper
binder
pulp
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.)
Expired - Lifetime
Application number
EP93903587A
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German (de)
English (en)
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EP0623070A4 (en
EP0623070A1 (fr
Inventor
James A. Goettmann
Stephen H. Monroe
Peter J. Angelini
John R. Boylan
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Polyweave International LLC
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Polyweave International LLC
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Publication date
Priority claimed from US07/916,819 external-priority patent/US5403444A/en
Application filed by Polyweave International LLC filed Critical Polyweave International LLC
Publication of EP0623070A1 publication Critical patent/EP0623070A1/fr
Publication of EP0623070A4 publication Critical patent/EP0623070A4/en
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Publication of EP0623070B1 publication Critical patent/EP0623070B1/fr
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/04—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps to be fastened or secured by the material of the label itself, e.g. by thermo-adhesion
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
    • D04H1/43835—Mixed fibres, e.g. at least two chemically different fibres or fibre blends
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4282—Addition polymers
    • D04H1/4291—Olefin series
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4282—Addition polymers
    • D04H1/4309—Polyvinyl alcohol
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4326—Condensation or reaction polymers
    • D04H1/435—Polyesters
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
    • D04H1/43825—Composite fibres
    • D04H1/43828—Composite fibres sheath-core
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • 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
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/12—Organic non-cellulose fibres from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/14—Polyalkenes, e.g. polystyrene polyethylene
    • 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
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/12—Organic non-cellulose fibres from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/16—Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
    • 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
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/24—Polyesters
    • 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
    • D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
    • D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
    • D21H15/10—Composite fibres
    • 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
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/16—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising curable or polymerisable compounds
    • 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
    • D21H25/04—Physical treatment, e.g. heating, irradiating
    • D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper

Definitions

  • This invention generally relates to synthetic paper made on conventional continuous wet-lay papermaking equipment.
  • the invention relates to recyclable polymeric synthetic paper made of 100% polymeric material.
  • the invention also relates to labels, especially to labels adapted for use in labeling of blow-molded plastic containers.
  • the label comprises a coated 100% synthetic web prepared by a wet-lay process.
  • the label may be applied either in-mold or post-mold to a blow-molded container made of the same synthetic material as the main synthetic fiber component (for example, polyethylene, polyester or polypropylene) of the label with or without the use of an adhesive material and may be recycled along with the container.
  • the main synthetic fiber component for example, polyethylene, polyester or polypropylene
  • U.S. Patent No. 5,047,121 to Kochar discloses a process for making synthetic paper containing at least 97 wt.% polyethylene on conventional continuous wet-lay papermaking equipment.
  • the process includes the steps of: (1) preparing a pulp furnish comprising 97-99.5 wt.% polyethylene fibers and 0.5-3.0 wt.% polyvinyl alcohol binder fibers; (2) depositing the pulp furnish on the screen of a wet-lay papermaking machine to form a waterleaf sheet; (3) drying the resulting waterleaf sheet on heated drying cans having a drying profile wherein an initial drying phase is provided at a temperature between 200°F and 270°F to melt the polyvinyl alcohol fibers and a second drying phase is provided at a temperature between 190°F and 240°F to control stretch and elongation of the sheets; and (4) thermally bonding the dried sheet at a temperature between 250°F and 315°F to provide polyethylene paper.
  • the thermal bonding can be accomplished with a calendar roll.
  • the Kochar patent teaches that: (1) the strength of the synthetic paper can be tailored by varying the amount of polyvinyl alcohol fibers mixed into the polyethylene pulp; and (2) the porosity of the synthetic paper can be tailored by varying the bonding temperature.
  • the polyethylene pulp is fused to a degree dependent on the thermal bonding temperature.
  • the low opacity of the resulting paper makes it unsuitable for use in high-quality printing. This is because the application of too much heat for a long duration causes the polyethylene pulp to flow to such a degree that it becomes increasingly translucent as it approaches a polyethylene film in structure.
  • Paper made of 100% synthetic fibers is useful as label paper.
  • the in-mold labeling of blow-molded plastic containers is less costly than conventional labeling methods in which labels with adhesive backing are adhered to the container in a separate step subsequent to blow molding. In-mold labeling eliminates this separate step, thereby reducing labor costs associated with handling of the adhesive-backed labels and capital costs associated with the equipment used to handle and apply adhesive-backed labels.
  • labels are sequentially supplied from a magazine and positioned inside the mold by, for example, a vacuum-operated device.
  • Plastic material is then extruded from a die to form a parison as depicted in Fig. 6 of U.S. Patent No. 4,986,866 to Ohba et al., the description of which is specifically incorporated by reference herein.
  • the mold is locked to seal the parison and then compressed air is fed from a nozzle to the inside of the parison to perform blow molding wherein the parison is expanded to conform to the inner surface of the mold.
  • the heat-sealable layer of the label of Ohba et al. is pressed by the outer side of the parison and fused thereto.
  • the mold is cooled to solidify the molded container and opened to obtain a labeled hollow container.
  • the labeling of blow-molded containers be conducted continuously and rapidly.
  • the labels to be applied during in-mold labeling should be sufficiently stiff that the automatic equipment used to handle the labels does not cause wrinkling or folding thereof.
  • the labels must be sufficiently elastic that they neither tear nor separate from the plastic container during flexing or squeezing of the latter.
  • a further disadvantage of conventional in-mold labels prepared from paper is that prior to recycling of the plastic container, the paper label must be removed using either solvent or mechanical means to avoid contamination of the recycled plastic material by small pieces of paper.
  • U.S. Patent No. 4,837,075 to Dudley which teaches a coextruded plastic film label for in-mold labeling of blow-molded polyethylene containers.
  • the label comprises a heat-activatable ethylene polymer adhesive layer and a surface printable layer comprising polystyrene.
  • the heat activatable adhesive substrate layer comprises a polyethylene polymer.
  • Pigment or fillers are incorporated in the polystyrene layer to provide a suitable background for printing.
  • An example of a suitable pigment is titanium dioxide and an example of a suitable filler is calcium carbonate.
  • Preferably a layer is interposed between the adhesive substrate and the surface printable layer that comprises reground and recycled thermoplastic material used to prepare such labels.
  • the label stock is prepared by coextrusion of the various label layers utilizing conventional coextrusion techniques. Separately applied adhesive is not employed.
  • the aforementioned patent to Ohba et al. teaches a synthetic label for in-mold labeling of blow-molded resin containers comprising a thermoplastic resin film base layer and a heat-sealable resin layer having a melting point lower than that of the thermoplastic resin base layer.
  • the base layer has an inorganic filler, such as titanium dioxide or calcium carbonate, incorporated therein or incorporated in a latex coating thereon.
  • the base layer may, for example, be high-density polyethylene or polyethylene terephthalate.
  • the heat-sealable resin layer may, for example, be low-density polyethylene.
  • the heat-sealable resin layer serves to firmly adhere the label to a resin container.
  • four separate layers are joined together by coextrusion.
  • U.S. Patent No. 5,006,394 to Baird teaches a polymeric film structure having a high percentage of fillers, for example, opacifying or whitening agents such as titanium dioxide and calcium carbonate.
  • the fillers are concentrated in a separate filler containing layer coextruded with a base layer.
  • the base layer may comprise polyolefins (for example, polyethylenes), polyesters or nylons.
  • the filler-containing layer may comprise any of the same polymeric materials, but preferably comprises ethylene vinyl acetate coploymer.
  • this film material is intended for use in disposable consumer products such as diapers.
  • U.S. Patent No. 4,941,947 to Guckert et al. discloses a thermally bonded composite sheet comprising a layer of flash-spun polyethylene plexifilamentary film-fibril strand sheet in face-to-face contact with a layer of polyethylene synthetic pulp suitable for use in bar code printing.
  • the layer of polyethylene synthetic pulp is formed by conventional wet-lay papermaking techniques.
  • the present invention improves upon the prior art by providing a flexible polymeric synthetic nonwoven substrate which is suitable for use as lint-free writing paper, labels on plastic bottles, release liner, specialty packaging paper or filter paper.
  • a flexible polymeric synthetic nonwoven substrate which is suitable for use as lint-free writing paper, labels on plastic bottles, release liner, specialty packaging paper or filter paper.
  • one preferred embodiment of the invention is a high-opacity polymeric synthetic nonwoven substrate suitable for use in high-quality printing applications.
  • the polymeric synthetic paper of the invention contains no cellulosic fibers and therefore can be easily recycled without costly procedures for separating polymeric and cellulosic materials.
  • the synthetic paper in accordance with the invention can be used as labels on polymeric containers, for example, labels for blow-molded polymeric containers, which need not be removed prior to recycling of the polymeric containers.
  • labels sufficiently elastic to withstand flexing and squeezing of the plastic container without tearing or separating therefrom.
  • the nonwoven label of the invention is more porous than film labels, which enhances the printability of the label, and is cheaper to manufacture.
  • the synthetic paper comprises a nonwoven web of fibers, at least one side of which has a pigmented coating, e.g., a pigment-containing latex.
  • the paper is manufactured from commercially available fibers. The components may be combined in water into a homogeneous mixture and then formed into a web employing a wet-lay process.
  • the fiber composition of the web is 88-100% polyethylene pulp and 0-12% polyvinyl alcohol binder fibers.
  • the web comprises 70-100% polyethylene pulp, 0-12% polyvinyl alcohol binder fibers and 0-30% polypropylene fibers.
  • Polypropylene pulp can be substituted for all or any portion of the polyethylene pulp.
  • the fiber composition of the web is 50-90% chopped polyester staple fibers, 10-40% bicomponent polyester/co-polyester core/sheath binder fibers and 0-10% polyvinyl alcohol binder fibers bonded together.
  • Each bicomponent binder fiber comprises a core of polyester surrounded by a co-polyester sheath.
  • the nonwoven web of fibers is made more printable by saturation with a binder material, for example, with a suitable latex having a glass transition temperature (T g ) of 0-30°C.
  • the latex is preferably compounded to contain pigment such as calcium carbonate, titanium dioxide or both at pigment/binder ratios of 0.5/1 to 8/1, resulting in a synthetic paper having a surface suitable for high-quality printing thereon.
  • T g glass transition temperature
  • the latex is preferably compounded to contain pigment such as calcium carbonate, titanium dioxide or both at pigment/binder ratios of 0.5/1 to 8/1, resulting in a synthetic paper having a surface suitable for high-quality printing thereon.
  • the use of a latex binder, as opposed to other conventional binders, is not required to practice the invention.
  • synthetic paper is formed from a web of synthetic fibers with no cellulosic fibers.
  • the synthetic fibers may be made of polyethylene, polyester, polypropylene or any other polymeric material suitable for use in high-opacity paper.
  • the web comprises 88-100% polyethylene fibers and 0-12% polyvinyl alcohol fibers and is coated with a suitable latex having a glass transition temperature (T g ) of 0-30°C and compounded to contain pigment such as calcium carbonate, titanium dioxide, clay, talc or other inorganic pigments as known to those skilled in the art.
  • T g glass transition temperature
  • the coating may contain any conventional binder other than latex.
  • the synthetic paper in accordance with the invention is manufactured from commercially available fibers such as polyethylene pulp, polypropylene pulp, chopped polyester staple fibers and polyvinyl alcohol binder fibers.
  • the components may be combined in water into a homogeneous mixture and then formed into a mat employing a wet-lay process.
  • the starting fiber materials consist of 90 wt.% Mitsui 9400 FybrelTM polyethylene pulp commercially available in the United States from Minifibers, Route 14, Box 11, Johnson City, Tennessee 37615 and 10 wt.% Kuraray 105-2 polyvinyl alcohol (PVA) binder fibers commercially available in the United States from Itochu Corp., 335 Madison Avenue, New York, New York 10017.
  • PVA polyvinyl alcohol
  • the polyethylene fibers have an average length of 0.90 mm and a diameter of 15 microns.
  • Kuraray 105-2 PVA binder fibers have an average length of 5 mm and a denier of 2.0.
  • the starting fiber material may be 100 wt.% Mitsui 9400 FybrelTM polyethylene pulp, that is, PVA binder fibers are not essential to practice of the invention.
  • the polyethylene pulp is entangled during the wet lay process to form the base sheet.
  • the base sheet may thereafter be coated with the pigmented binder - avoiding thermal fusion of the polyethylene pulp - to produce a high-opacity synthetic paper having excellent printability.
  • polyethylene-based synthetic paper some of the Kuraray 105-2 PVA binder fibers are replaced by 10 mm X 2.2 denier Hercules HerculonTM polypropylene staple fibers. These polypropylene staple fibers are commercially available in the United States from Hercules, Inc., 3169 Holcomb Bridge Road, Suite 301, Norcross, Georgia 30071.
  • the web is comprised of 70-100% polyethylene fibers, 0-12% PVA fibers and 0-30% polypropylene fibers.
  • One example of this variation successfully made by the inventors had 85% polyethylene fibers, 7.5% PVA fibers and 7.5% polypropylene fibers.
  • polypropylene pulp can be substituted for the polyethylene pulp.
  • the base mat After the base mat has been dried, it is preferably treated with a coating comprised of a binder, e.g., latex, pigmented with calcium carbonate, titanium dioxide, clay, talc or other inorganic pigment to enhance the printability of the paper.
  • a coating comprised of a binder, e.g., latex, pigmented with calcium carbonate, titanium dioxide, clay, talc or other inorganic pigment to enhance the printability of the paper.
  • the surface treatment may be applied with any commercially available coater, treater or size press. Thereafter the web can be machine calendared to give the coating a predetermined surface smoothness.
  • the starting coating materials are 50 wt.% Vinac 884 vinyl acetate latex and 50 wt.% Albagloss calcium carbonate.
  • Airflex 4514 ethylene vinyl chloride latex can be used in place of the Vinac 884 vinyl acetate latex, although the latter is preferred.
  • the Vinac 884 and Airflex 4514 latexes are commercially available in the United States from Air Products and Chemicals, Polymers and Chemicals Division, 7201 -Hamilton Blvd., Allentown, Pennsylvania 18195-1501.
  • the Albagloss calcium carbonate is commercially available in the United States from Pfizer, Inc., Minerals, Pigments and Metals Division, 640 North 13th Street, Easton, Pennsylvania 18042-1497.
  • the range of calcium carbonate incorporated in the coating can be varied from a pigment/binder ratio of 0.5/1 to 8/1, although the preferred ratio is 1/1.
  • the synthetic paper in accordance with the invention can be made on standard papermaking equipment.
  • the process for making label paper prepared from a web of polyethylene pulp, PVA binder fibers and polypropylene staple fibers is described hereinafter with reference to FIGS. 1 and 2, which show the stock make-up equipment 8 and the papermaking equipment 10, respectively.
  • the FybrelTM 9400 polyethylene pulp is loaded in a fiber opening chest 12 at consistencies between 2% and 5% solids. The pulp is agitated until it is completely dispersed in water and no fiber bundles are apparent. This mixture is then pumped to a blend chest 18 via a deflaker 16. In the deflaker the fibers are subjected to fiber-to-fiber agitation which removes any fiber bundles or unopened clumps. The deflaker is preferable to a disk refiner in that no cutting or shortening of the fibers occurs.
  • a predetermined amount of Kuraray 105-2 PVA binder fibers and, optionally, a predetermined amount of polypropylene staple fibers are loaded in a fiber opening chest 14 at consistencies between 0.5% and 5% solids in hot water.
  • the PVA binder fibers become gelatinous in hot water.
  • the dispersion is agitated until the staple fibers are completely dispersed in water and no fiber bundles are apparent.
  • This mixture is then pumped into blend chest 18. Alternatively, no pump is needed if the mixture is dropped by gravity into blend chest 18.
  • the binder and staple fiber dispersion is added to the furnish so that the PVA binder fibers and the staple fibers make up 0-12 wt.% and 0-30 wt.% of the furnish solids, respectively.
  • the mixture is agitated to achieve a uniform dispersion of the polyethylene pulp, staple fibers and gelatinous PVA having a consistency between 1% and 5% solids.
  • the furnish is then pumped by pump 20 to the refiner 22, which beats the fibers as needed to reduce their average length.
  • the refined furnish then enters a surge chest 24, where it is mixed with the broke furnish from broke pulper 26.
  • Broke is synthetic paper that has been rejected during the process of manufacture. Broke may take the form of either "wet” broke or “dry” broke. Wet broke is synthetic paper taken off the wet press of the paper machine. Dry broke is paper spoiled when passing through the dryers or the calendar, trimmed off in the rewinding of rolls, trimmed from sheet being prepared for shipping or rejected for manufacturing defects.
  • the broke is loaded in the broke pulper 26 at consistencies between 1% and 5% solids.
  • the broke furnish is agitated by high-shear agitator 28 until the broke fibers are completely dispersed in water and no fiber bundles are apparent.
  • the broke furnish is then pumped to surge chest 24 via a deflaker 30 in a controlled manner to maintain consistency and limit the percent of broke addition to not exceed 20% of the total volume.
  • the refined furnish and the broke furnish are mixed in surge chest 24 until a uniform dispersion is achieved.
  • the furnish in surge chest 24 is then pumped via pump 32 into machine chest 34, which feeds its contents into the forming section while maintaining a constant level in the chest to reduce variation in product weight.
  • the final stock is pumped to the papermaking machine (see FIG. 2) by pump 36.
  • the furnish is supplied to the headbox 42 at consistencies between 0.1% and 1% solids.
  • a web of synthetic fibers is then formed on standard wet-lay papermaking equipment by forming wire 44. Excess water is removed by gravity and vacuum devices.
  • the formed web is wet-pressed in press section 46 and then dried in the first dryer section 48 at a temperature in the range of 140°F to 260°F to remove more water.
  • the polymeric fibers are not fused, but rather the gelatinous PVA becomes a glue which pre-bonds the polyethylene pulp and staple fibers into a web.
  • PVA is unnecessary.
  • 100% polyethylene pulp entangled by the wet-lay process has adequate strength to be fed to the saturator/coater.
  • care must be taken to ensure that the web and dryer can temperatures remain below the melting point of the polyethylene fibers, that is, below 269°F (132°C). Otherwise the opacity of the synthetic paper will be degraded.
  • the use of release coating on the dryer cans was found to be beneficial in preventing buildup or sticking that will eventually cause web defects and/or breaks.
  • the dried web is saturated with the latex solution containing calcium carbonate pigment.
  • This treatment may be performed on a paper machine size press or any type of off-line coater or treater 50 which is supplied with saturant from mixing chest 52.
  • the coating is applied to the web in an amount that achieves a 10 wt.% add-on of dried coating solids, that is, 200 lbs/ton, although it will be recognized by the person skilled in the art that the weight percentage of dried coating solids can be varied over a wide range.
  • the coating is then dried in the second dryer section 54, again at a temperature in the range of 140°F to 260°F, whereby the latex bonds the fibers to each other and bonds the pigment to the fibers.
  • the coated web is machine calendared in calendar 56 to attain a surface smoothness (Sheffield) of 125-250 units and is then wound on winding reel 58.
  • Sheffield surface smoothness
  • the web comprises chopped polyester staple fibers, bicomponent polyester/co-polyester core/sheath binder fibers and PVA binder fibers.
  • Each bicomponent binder fiber comprises a core of polyester surrounded by a co-polyester sheath.
  • the sheet is then coated with a vinyl acetate latex having a glass transition temperature (T g ) of 0-30°C.
  • T g glass transition temperature
  • the latex may be compounded to contain pigment such as calcium carbonate, titanium dioxide, clay, talc or other inorganic pigments at pigment/binder ratios of 0.5/1 to 8/1. Because synthetic paper in accordance with these embodiments has no cellulosic fibers, the synthetic paper may be recycled without going through a separation process.
  • the starting fiber materials are 77 wt.% Kuraray polyester chopped strand, 19 wt.% Kuraray N-720 polyester/copolyester core/sheath binder fibers and 4 wt.% Kuraray 105-2 PVA binder fibers. All of these fibers are commercially available in the United States from Itochu Corp., 335 Madison Avenue, New York, New York 10017.
  • the Kuraray chopped polyester staple fibers have an average length of 10 mm and a denier of 0.4.
  • Kuraray N-720 polyester/co-polyester core/sheath binder fibers have an average length of 10 mm and a denier of 2.0.
  • Kuraray 105-2 PVA binder fibers have an average length of 5 mm and a denier of 2.0.
  • the starting fiber materials are 80 wt.% Kuraray polyester chopped strand and 20 wt.% Kuraray N-720 polyester/copolyester core/sheath binder fibers. No Kuraray 105-2 PVA binder fibers are used.
  • an equal weight percent of Teijin polyester staple fibers having an average length of 5 mm and a denier of 0.5 can be substituted for the Kuraray chopped polyester staple fibers in the polyester-based synthetic paper.
  • an equal weight percent of polyethylene pulp can be substituted for the PVA binder fibers.
  • the polyester chopped staple fibers can be combined with either PVA binder fibers or polyester/co-polyester core/sheath binder fibers or with both, but only in an amount sufficient to hold the web together as it is fed to a thermal calendar.
  • the thermal calendar then fuses the polyester chopped staple fibers using rolls heated to temperatures of 360-410°F (preferably 390°F) and nip pressures of 40 psi or greater (preferably 50 psi).
  • the resulting base sheet may be optionally coated with pigmented binder as disclosed above
  • the fiber composition of the polyester-based synthetic paper is not limited to the specific weight percentages of the examples described above.
  • the amount of PVA binder fibers may be varied from 0 to 10 wt.%; the amount of co-polyester/polyester sheath/core binder fibers may be varied from 0 to 40 wt.%; and the amount of polyester staple fibers may be varied from 50 to 90 wt.%.
  • the average length and the denier of the chopped polyester staple fibers may vary from 5 to 12 mm and from 0.4 to 1.5 denier respectively; and the average length and the denier of the co-polyester/polyester sheath/core binder fibers may vary from 5 to 12 mm and from 2.0 to 6.0 denier respectively.
  • the starting coating materials are 50 wt.% Vinac 884 vinyl acetate latex and 50 wt.% Albagloss calcium carbonate.
  • Airflex 4514 ethylene vinyl chloride latex can be used in place of the Vinac 884 vinyl acetate latex, although the latter is preferred.
  • the range of calcium carbonate incorporated in the coating can be varied from a pigment/binder ratio of 0.5/1 to 8/1, although the preferred ratio is 1/1.
  • the glass transition temperature T g of the vinyl acetate latex may vary from 0°C to 30°C.
  • the web material in accordance with the second preferred embodiment can be made on standard papermaking or nonwoven fabric equipment.
  • the polyester cut staple fibers, the polyester/co-polyester core/sheath binder fibers and the polyvinyl alcohol binder fibers are added to water undergoing agitation and, containing a predissolved surfactant material, such as Milease T, at a level of 0.5% based on polyester fiber weight.
  • Milease T is commercially available from I.C.I. Americas, Inc.
  • the foregoing fiber components should be added to the blend chest in the following sequence: (1) polyvinyl alcohol binder fibers, (2) polyester/co-polyester core/sheath binder fibers and (3) chopped polyester staple fibers.
  • the consistency of the mixture in the blend chest should be between 0.5 and 2.5% solids.
  • An anionic polyacrylamide such as 87P061 may be added at levels in the range 0.5-8.0 lbs/ton based on fiber weight to aid in fiber dispersion. 87P061 is commercially available from Nalco Chemical.
  • the mixture is then agitated to attain a uniform dispersion of all materials. The refining step and broke recovery can be bypassed for the second preferred embodiment.
  • the resulting furnish is then formed on standard wet-lay papermaking equipment at headbox consistencies of 0.7-0.01%.
  • the wet-laid material is then dried in the dryer section.
  • the dried web is calendared between smooth metal rolls heated to a temperature of 196°C.
  • the web is calendared at minimal pressure, that is, 50-150 PLI, to achieve bonding of the surface fibers while maintaining the degree of opacity of the original sheet.
  • This material is then ready to be treated with the vinyl acetate latex solution pigmented with calcium carbonate.
  • the treatment may be applied on a paper machine size press or any type of off-line coater or saturator.
  • the coating is applied in a manner that results in a 10 wt.% add-on of dried coating solids, that is, 200 lbs/ton.
  • the coating is then dried. After the coating is dried, the coated web is supercalendared to attain a surface smoothness (Sheffield) of 125-250 units.
  • Table IV shows the effect of adding a 10-mm-long polypropylene staple fiber to the furnish.
  • the three samples tested had the following compositions: (A) 90% Mitsui 9400 polyethylene pulp, 10% PVA binder fiber and 0% staple fiber; (B) 90% Mitsui 9400 polyethylene pulp, 0% PVA binder fiber and 10% staple fiber; and (C) 85% Mitsui 9400 polyethylene pulp, 7.5% PVA binder fiber and 7.5% staple fiber. Tear strength is improved as the result of adding staple fiber and the improvement is maximized when a binder fiber is included. Porosity increases as the level of higher-diameter fiber (the binder fiber and the staple fiber) increases.
  • Table V shows the effect of coating or size press applications of a binder.
  • the main effect being designed to is the surface strength so that the web can be printed on without the surface being damaged from the tacky ink on the printing plate.
  • the IGT number shows the improvement when a coating is applied. (IGT is a standard laboratory printing test wherein if the material is weak in the direction perpendicular to the sheet, it will pull apart or large sections of the surface will be pulled out.)
  • a carefully formulated coating can also decrease porosity. Stiffness can be increased or left unchanged by careful selection of the binder.
  • the porosity of the synthetic paper can be controlled by carefully adjusting the coating formulation and by adjusting the amount of staple fibers.
  • GSM Physical Property Base Uncoated Sheet Finished Coated Sheet Basis Weight
  • MD/CD Caliper (mils) 6 7 Mullen Burst (psi) 4 9
  • the synthetic paper of the invention can be used in labeling of blow-molded plastic containers.
  • the label may be applied either in-mold or post-mold to a blow-molded container made of the same synthetic material as the main synthetic fiber component (for example, polyethylene, polyester or polypropylene) of the label with or without the use of an adhesive material and may be recycled along with the container.
  • the main synthetic fiber component for example, polyethylene, polyester or polypropylene
  • labels are sequentially supplied from a magazine and positioned inside the mold by, for example, a vacuum-operated device.
  • Plastic material is then extruded from a die to form a parison as depicted in Fig. 6 of U.S. Patent No. 4,986,866 to Ohba et al., the description of which is specifically incorporated by reference herein.
  • the mold is locked to seal the parison and then compressed air is fed from a nozzle to the inside of the parison to perform blow molding wherein the parison is expanded to conform to the inner surface of the mold.
  • the heat-sealable layer of the label of Ohba et al. is pressed by the outer side of the parison and fused thereto.
  • the mold is cooled to solidify the molded container and opened to obtain a labeled hollow container.
  • a disadvantage of conventional in-mold labels prepared from paper is that prior to recycling of the plastic container, the paper label must be removed using either solvent or mechanical means to avoid contamination of the recycled plastic material by small pieces of paper.
  • fibers other than polyethylene pulp and polyester chopped staple fibers can be used as the main fiber component.
  • polyester pulp could be used in place of polyester chopped staple fibers in the event that polyester pulp becomes commercially available.
  • suitable polymeric fibers having a melting point lower than that of the main fiber component can be substituted for PVA binder fibers.
  • polyethylene pulp could be used in place of PVA binder fibers in the-polyester-based synthetic paper.

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Claims (30)

  1. Papier synthétique exempt de cellulose à opacité élevée comprenant une bande non tissée de fibres thermoplastiques déposées par voie humide, toutes ou la plupart desdites fibres thermoplastiques étant faites d'une matière polymère prédéterminée, ladite bande ayant un revêtement continu de liant pigmenté formé sur au moins une surface de celle-ci, lesdites fibres thermoplastiques de ladite matière polymère prédéterminée étant liées par ledit liant pigmenté sans thermofusion substantielle par durcissement dudit liant à des températures inférieures à la température de fusion de ladite matière polymère prédéterminée.
  2. Papier synthétique comme défini dans la revendication 1, dans lequel ladite matière polymère prédéterminée est une polyoléfine.
  3. Papier synthétique comme défini dans la revendication 2, dans lequel ladite polyoléfine est du polyéthylène ou du polypropylène.
  4. Papier synthétique comme défini dans la revendication 1, dans lequel lesdites fibres faites de ladite matière polymère prédéterminée sont de la pulpe de polyéthylène ou de polypropylène.
  5. Papier synthétique comme défini dans la revendication 4, dans lequel la composition de fibres de ladite bande non tissée est de 88-100% de pulpe oléfinique et de 0-12% de fibres de liant d'alcool de polyvinyle.
  6. Papier synthétique comme défini dans la revendication 1, dans lequel ledit liant comprend de l'acétate de vinyle.
  7. Papier synthétique comme défini dans la revendication 6, dans lequel le rapport du pigment au latex se situe dans l'intervalle de 0,5/1 à 8/1.
  8. Papier synthétique comme défini dans la revendication 4, dans lequel la composition de fibres de ladite bande non tissée est de 70-100% de pulpe oléfinique, 0-12% de fibres de liant d'alcool de polyvinyle et de 0-30% de fibres découpées oléfiniques.
  9. Papier synthétique comme défini dans la revendication 8, dans lequel lesdites fibres découpées oléfiniques comprennent des fibres découpées de polyéthylène ou de polypropylène.
  10. Dans un papier synthétique comprenant un conteneur moulé par soufflage constitué d'une matière polymère prédéterminée et ayant une surface externe et une étiquette attachée à ladite surface externe dudit conteneur moulé par soufflage, amélioration dans laquelle ladite étiquette est un papier synthétique comme défini dans la revendication 1, ledit papier synthétique étant lié à ladite surface externe dudit conteneur moulé par soufflage, au moins certaines desdites fibres qui composent ledit papier synthétique étant constituées de ladite matière polymère prédéterminée.
  11. Bande composite non tissée pour l'utilisation dans la fabrication de papier synthétique exempt de cellulose, comprenant une bande non tissée de 100% de fibres thermoplastiques emmêlées par le procédé de dépôt par voie humide, lesdites fibres thermoplastiques comprenant principalement de la pulpe non fondue constituée d'une matière polymère prédéterminée.
  12. Bande composite non tissée comme défini dans la revendication 11, dans laquelle ladite matière polymère prédéterminée est du polyéthylène ou du polypropylène.
  13. Bande composite non tissée comme défini dans la revendication 11, dans laquelle la composition de fibres de ladite bande non tissée inclut uniquement de la pulpe oléfinique.
  14. Bande composite non tissée pour l'utilisation dans la fabrication de papier synthétique exempt de cellulose, comprenant une bande non tissée de 100% de fibres thermoplastiques emmêlées par un procédé de dépôt par voie humide, ladite bande ayant la composition de fibres suivantes :
    50-90% de fibres découpées de polyester ;
    0-40% en poids de fibres de liant contenant une matière thermoplastique ayant une température de fusion inférieure à la température de fusion desdites fibres découpées de polyester ; et
    0-10% de fibres de liant d'alcool de polyvinyle.
  15. Bande composite non tissée comme défini dans la revendication 4, dans laquelle lesdites fibres de liant comprennent des fibres à deux composants ayant une enveloppe constituée de copolyester et un noyau constitué de polyester, ladite enveloppe de copolyester ayant une température de fusion qui est inférieure à la température de fusion desdites fibres découpées de polyester.
  16. Bande composite non tissée comme défini dans la revendication 14, dans laquelle ladite bande est maintenue ensemble par fusion soit desdites enveloppes de copolyester soit desdites fibres de liant d'alcool de polyvinyle soit des deux avant le calandrage thermique et ensuite est calandrée thermiquement pour fondre lesdites fibres découpées de polyester.
  17. Bande composite non tissée comme défini dans la revendication 14, dans laquelle ladite bande est maintenue ensemble par fusion soit desdites enveloppes de copolyester soit desdites fibres de liant d'alcool de polyvinyle soit des deux et ensuite est saturée sur au moins un de ses côtés avec un revêtement continu de liant pigmenté.
  18. Procédé pour la fabrication d'un papier synthétique exempt de cellulose d'opacité élevée comprenant les étapes de :
    formation d'une bande non tissée comprenant 100% de fibres thermoplastiques par un procédé de dépôt par voie humide, toutes ou la plupart desdites fibres thermoplastiques étant constituées d'une matière polymère prédéterminée ;
    séchage de ladite bande déposée par voie humide pour éliminer l'eau en excès, ledit séchage étant effectué à des températures inférieures à la température de fusion de ladite matière polymère prédéterminée;
    saturation de ladite bande non tissée séchée sur au moins un côté avec un liant pigmenté formant un revêtement continu sur elle : et
    durcissement dudit liant à des températures inférieures à la température de fusion de ladite matière polymère prédéterminée.
  19. Procédé pour la fabrication d'un papier synthétique comme défini dans la revendication 18, dans lequel lesdites fibres thermoplastiques constituées de ladite matière polymère prédéterminée sont de la pulpe oléfinique.
  20. Procédé pour la fabrication d'un papier synthétique comme défini dans la revendication 19, dans lequel la composition de fibres de ladite bande non tissée est de 88-100% de pulpe oléfinique et 0-12% de fibres de liant d'alcool de polyvinyle.
  21. Procédé pour la fabrication d'un papier synthétique comme défini dans la revendication 18, dans lequel ledit liant comprend du latex et le rapport du pigment au latex se situe dans l'intervalle de 0,5/1 à 8/1.
  22. Procédé pour la fabrication d'un papier synthétique comme défini dans la revendication 19, dans lequel la composition de fibres de ladite bande non tissée est de 70-100% de pulpe oléfinique, 0-12% de fibres de liant d'alcool de polyvinyle et 0-30% de fibres oléfiniques découpées.
  23. Procédé pour la fabrication d'une bande composite non tissée pour l'utilisation dans la fabrication d'un papier synthétique exempt de cellulose comprenant les étapes de :
    formation d'une bande non tissée comprenant 100% de pulpe thermoplastique par un procédé de dépôt par voie humide, toute ladite pulpe thermoplastique étant constituée d'une matière oléfinique : et
    séchage de ladite bande déposée par voie humide pour éliminer l'eau en excès, ledit séchage étant effectué à des températures inférieures à la température de fusion de ladite matière oléfinique.
  24. Procédé pour la fabrication d'un papier synthétique comme défini dans la revendication 23, comprenant en outre les étapes de :
    saturation de ladite bande non tissée séchée sur au moins un de ses côtés avec un liant pigmenté formant un revêtement continu sur elle : et
    durcissement dudit liant à des températures inférieures à la température de fusion de ladite matière oléfinique.
  25. Procédé pour la fabrication d'un papier synthétique comme défini dans la revendication 23, dans lequel lesdites fibres constituées de ladite matière polymère prédéterminée sont de la pulpe oléfinique.
  26. Procédé pour la fabrication d'une bande composite non tissée pour l'utilisation dans la fabrication d'un papier synthétique exempt de cellulose comprenant les étapes de :
    formation d'une bande non tissée à partir de la dispersion de 100% de fibres thermoplastiques par un procédé de dépôt par voie humide, la composition de fibres de ladite dispersion étant de 50-90% de fibres découpées de polyester et de 10-50% de fibres de liant : et
    fusion desdites fibres de liant pour maintenir ladite bande ensemble quand ladite bande est transportée à une étape ultérieure de traitement, lesdites fibres de liant étant fondues à une température à laquelle lesdites fibres découpées de polyester ne sont pas fondues.
  27. Procédé pour la fabrication d'une bande composite non tissée comme défini dans la revendication 26, dans lequel la composition de fibres de ladite dispersion est de 50-90% de fibres découpées de polyester, 10-40% de fibres de liant noyau/enveloppe de polyester/copolyester et 0-10% de fibres de liant d'alcool de polyvinyle.
  28. Procédé pour la fabrication d'une bande composite non tissée comme défini dans la revendication 26, dans lequel ladite étape ultérieure de traitement est le calandrage thermique pour fondre lesdites fibres découpées de polyester.
  29. Procédé pour la fabrication d'une bande composite non tissée comme défini dans la revendication 26, dans lequel ladite étape ultérieure de traitement est la saturation de ladite bande sur au moins un côté de celle-ci avec un revêtement continu de liant pigmenté.
  30. Papier synthétique exempt de cellulose d'opacité élevée, comprenant une bande non tissée de fibres synthétiques déposées par voie humide, lesdites fibres synthétiques incluant des fibres de liant et de la pulpe polymère ou des fibres découpées de polymère, ladite pulpe polymère ou les fibres découpées de polymère étant liées par fusion desdites fibres de liant sans fusion substantielle de ladite pulpe polymère ou des fibres découpées de polymère à des températures inférieures à la température de fusion de ladite pulpe polymère ou des fibres découpées de polymère.
EP93903587A 1992-01-21 1993-01-21 Papier synthetique polymere recyclable et procede pour sa fabrication Expired - Lifetime EP0623070B1 (fr)

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Application Number Priority Date Filing Date Title
US82352592A 1992-01-21 1992-01-21
US823525 1992-01-21
US07/916,819 US5403444A (en) 1990-03-05 1992-07-20 Printable, high-strength, tear-resistant nonwoven material and related method of manufacture
US916819 1992-07-20
US488193A 1993-01-19 1993-01-19
US4881 1993-01-19
PCT/US1993/000482 WO1993013940A1 (fr) 1992-01-21 1993-01-21 Papier synthetique polymere recyclable et procede pour sa fabrication

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EP0623070A1 EP0623070A1 (fr) 1994-11-09
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EP0623070B1 true EP0623070B1 (fr) 1999-09-15

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DE69326443T2 (de) 2000-01-13
MX9300297A (es) 1993-12-01
EP0623070A4 (en) 1994-11-17
EP0623070A1 (fr) 1994-11-09
WO1993013940A1 (fr) 1993-07-22
KR950700463A (ko) 1995-01-16
ATE184542T1 (de) 1999-10-15
CA2128102A1 (fr) 1993-07-22
DE69326443D1 (de) 1999-10-21
JPH07502578A (ja) 1995-03-16
CA2128102C (fr) 2002-04-09

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