Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B15/00—Layered products comprising a layer of metal
  • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M1/00—Inking and printing with a printer's forme
  • B41M1/26—Printing on other surfaces than ordinary paper
  • B41M1/28—Printing on other surfaces than ordinary paper on metals
• • 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
  • D21H19/02—Metal coatings
  • D21H19/08—Metal coatings applied as vapour, e.g. in vacuum
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B38/00—Ancillary operations in connection with laminating processes
  • B32B2038/0052—Other operations not otherwise provided for
  • B32B2038/0092—Metallizing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2255/00—Coating on the layer surface
  • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2255/00—Coating on the layer surface
  • B32B2255/20—Inorganic coating
  • B32B2255/205—Metallic coating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2323/00—Polyalkenes
  • B32B2323/04—Polyethylene

Definitions

• the present invention relates to metallized paper and more particularly to metallized paper having a thermoplastic film sandwiched between the metallic layer and the paper.
• the prior art discloses methods of depositing a metallic layer onto paper.
• Direct metallization of paper in a high vacuum metalli ⁇ zation chamber is known.
• direct metallization has been found to have significant disadvantages. Particularly when one of the more useful metals, such as aluminum, is used in direct metallization of paper, the resulting product has a dull gray lustre instead of the desired metallic appearance. Also in direct metallization of paper, the resulting product has very poor barrier properties; namely, the product tends to be porous and permeable to water vapor, oxygen, and other gases. It has also been found necessary to degas the paper prior to the high vacuum metallization in order to release gases and water vapor which have been absorbed into the paper and which would adversely affect the metallization process if not removed.
• thermoplastic film onto a fibrous material such as tissue, paper or cardboard prior to the vacuum metallizing step.
• a substrate composed of thermoplastic film extruded onto paper has not been used heretofore as a substrate for metallizing to produce a laminate product having the desirable, physical characteristics which applicants have achieved.
• thermoplastic film onto the paper sheet prior to metallization is believed to be more economical than the water-based polymer dispersion method described in U.S. Patent 3 S H3 3 888 and can be more readily controlled than con ⁇ ventional solvent or water-based-polymer coating techniques.
• the product. of the present •invention exhibits excellent resistance to moisture vapor transmission, resistance to oxygen, grease and oil absorption, and has been found to have exceptional qualities of metallic smoothness and gloss.
• the product of the present invention ex- ⁇ hibits significantly improved bursting strength, tensile strength, and high metallic brilliance heretofore unachiev ⁇ able for tissue thin paper; e.g., for paper having a basis weight less than about 28 g/m and is a low-cost substitute for paper foil laminates such as gift wrap, labels, food wraps, decorative trims, and reflective insulating.
• the wrapping product exhibit improved bursting strength and tensile strength for a broad range of paper weights including very thin paper base layers.
• thermoplastic mater ⁇ ial preferably polyethylene or polypropylene, particularly low density polyethylene
• the substrate may be exposed directly to conventional high vacuum metallization process to coat the exposed thermoplastic sur ⁇ face of the substrate with a thin metallic surface, prefer ⁇ ably aluminum.
• the resulting product is a decorative wrap having a smooth, metallic lustre on one side and improved physical property characteristics.
• the finished product exhibits the handling and flexibility of paper but yet has significantly improved bursting and tensile strength and a high metallic brilliance.
• the finished product also exhibits barrier properties; i.e., resistance to moisture vapor transmission, grease, and oxygen even for very thin paper base layers.
• the present invention thus results in a wrapping product which exhibits significantly improved strength and flexibil ⁇ ity and high metallic brilliance for a broad range of thin paper thicknesses; e.g., for paper base layers typically be-
• the reason for the high metal ⁇ lic brilliance achieved when depositing the metallic layer directly onto the exposed surface of the extruded plastic film is not fully understood. It is theorized that the high brilliance may be due to surface reaction occuring between the metal surface and the thin polymer film layer which may be en ⁇ hancing the reflective properties of the film. Applicants also theorize that the surprising high metallic brilliance may be caused by microscopic craters or irregularities in the polymer surface which may result when using a highly polished chill roller after the extrusion step for very thin polymer layers, particularly between about 5-» ⁇ g/m 2 to 11 g/m2.
• the product also exhibits barrier properties, such as re ⁇ sistance to moisture vapor transmission, oil, grease and oxygen absorption even at paper sheets having a basis weight as low as
• the finished metallized product exhibits barrier proper ⁇ ties at high, glossy metallic lustre and high tensile strength
• the polymer film itself can have a basis weight as low as about 5-6 g/m 2 to 11 g/m2 and
• the base layer may be composed of fibrous material such as tissue, paper, cardboard or woven or nonwoven fabric.
• the finished metallized pro ⁇ duct may be used as a packaging wrap or as a backing material, label or reflective insulator.
• the metallic layer may also be overprinted with indicia or designs or may be selectively re ⁇ moved to create such designs or indicia.
• the metallized pro ⁇ duct can also be laminated to heavier board or coated with pressure sensitive adhesive to form pressure sensitive labels.
• the present invention also has the advantage of not only obviating the need to apply solvent-based or aqueous disper ⁇ sion coating to the paper prior to metallization but also a smooth, high metallic brilliance is obtained without applica ⁇ tion of a lacquer or other coating to the metallic surface after metallization as taught in conventional methods.
• a preferred metallized laminate sheet of the invention is comprised of a paper base layer sheet, a thermoplastic polymer film extruded onto the paper base layer, and a metallic layer deposited onto the free surface of the polymer film so that the polymer film is sandwiched between the metallic layer and the paper base layer.
• the base layer is preferably a paper or fibrous sheet but may also be of a woven or nonwoven fabric.
• the thermoplastic film preferably is polyethylene film, more preferably low density polyethylene film. Polypro ⁇ pylene film is also a preferred film but other extrudable thermoplastics are within the scope of the invention.
• suitable thermoplastics may include pol olefins; vinyls such as polyvinyl chloride and polyyinylidene chloride; poly ⁇ esters such as polyethylene terephthalate; styrenes such as polystyrene; and acrylates such as polymethylmethacrylate and nylon.
• the base layer may typically have a basis weight in the range between about 17 g/m 2 to 50 g/m2 for thin to heavier weight paper or even cardboard having a basis weight of about
• the base layer may have a. basis weight
• the polymer film may have a basis weight as low as about
• the product of the invention may be used as a packaging wrap, backing paper or to form labels or reflective sheets and rolls for insulation; for example, in building construction.
• the metallic layer may serve a number of functions. Principally, it has a decorative purpose, since it creates a brilliant metallic surface. Print coats may be applied to the surface of the metallic layer to enhance its printabilit , and the metallic layer may also be overprinted with indicia or designs.
• the metallic layer may be selectively removed in order to create such designs or indicia.
• OMPI Test analysis of the physical property characteristics of the metallized laminate of the invention for a tissue thin paper base layer is presented in the example.
• the metallized laminate exhibits significantly improved bursting strength, tensile strength and barrier properties and exhibits a high metallic brilliance.
• the process of manufacture employs simply the steps of extruding the thermoplastic film uniformly onto a side of the paper base layer by use of conventional extrusion techniques to form a polymer film coated paper substrate; subjecting the poisoner film coated paper substrate preferably to a chill rolling step employing highly polished chill rollers; and then passing the substrate to conventional high vacuum paper metallization equipment wherein a thin, metallic layer, preferably aluminum is deposited onto the free surface of the polymer film.
• a polyethylene film was extruded onto this base layer tissue by use of extrusion coating methods for extruding a thermoplastic film onto a paper sheet to form a film coated paper substrate.
• the substrate was passed preferably through highly polished chrome chill rollers immediately after the extrusion of the film onto the paper sheet.
• the extruded polyethylene film layer had a basis weight of 5.8 g/m 2 and a density of 0.917 g /cm-- with a melt index of 12.0.
• the polyethylene-coated tissue was then subjected to a conventional high vacuum metallization, resulting in the deposition of enough aluminum to give a surface resistance of 2-4 ohms per square centimeter.
• the metallized laminate product had the following typical physical properties: Basis Weight: 27-2 g/m 2
• the laminate product is suitable for use directly as a decorative or packaging wrap or as a reflective insulator.
• the laminate product may be subjected to additional processing wherein print coats, commonly available from ink manufacturers, may be applied to the surface of the aluminum to enhance its printability.
• the metallized laminate can be subjected to other processing, depending on the desired end use; for example, the metallized product can be laminated to heavier board, or coated with pressure sensitive adhesive to form pressure sensitive labels.

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• Laminated Bodies (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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Cited By (1)

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• 1982
  • 1982-03-12 EP EP82901241A patent/EP0074998A1/de not_active Withdrawn
  • 1982-03-12 WO PCT/US1982/000314 patent/WO1982003202A1/en unknown

Non-Patent Citations (1)

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