WO2011006031A2 - Film de polymère pour protéger des plaques de verre - Google Patents

Film de polymère pour protéger des plaques de verre Download PDF

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Publication number
WO2011006031A2
WO2011006031A2 PCT/US2010/041466 US2010041466W WO2011006031A2 WO 2011006031 A2 WO2011006031 A2 WO 2011006031A2 US 2010041466 W US2010041466 W US 2010041466W WO 2011006031 A2 WO2011006031 A2 WO 2011006031A2
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WO
WIPO (PCT)
Prior art keywords
core layer
polymer
polymer film
skin layers
glass
Prior art date
Application number
PCT/US2010/041466
Other languages
English (en)
Other versions
WO2011006031A3 (fr
Inventor
Yao-sheng CHEN
Shih-Te Chu
Hongkyu Kim
Szuhsien Mai
Himanshu C Shah
Original Assignee
Corning Incorporated
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Corning Incorporated filed Critical Corning Incorporated
Priority to CN2010800353408A priority Critical patent/CN102596768A/zh
Priority to JP2012519749A priority patent/JP5723877B2/ja
Priority to KR1020127003538A priority patent/KR101819758B1/ko
Publication of WO2011006031A2 publication Critical patent/WO2011006031A2/fr
Publication of WO2011006031A3 publication Critical patent/WO2011006031A3/fr

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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
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C27/00—Joining pieces of glass to pieces of other inorganic material; Joining glass to glass other than by fusing
    • C03C27/06—Joining glass to glass by processes other than fusing
    • 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
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • 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
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific 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
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10036—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets
    • 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
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10036—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets
    • B32B17/10045—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets with at least one intermediate layer consisting of a glass sheet
    • 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
    • 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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/06—Interconnection of layers permitting easy separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D57/00—Internal frames or supports for flexible articles, e.g. stiffeners; Separators for articles packaged in stacks or groups, e.g. for preventing adhesion of sticky articles
    • B65D57/002—Separators for articles packaged in stacks or groups, e.g. stacked or nested
    • B65D57/003—Separators for articles packaged in stacks or groups, e.g. stacked or nested for horizontally placed articles, i.e. for stacked or nested articles
    • B65D57/004—Separators for articles packaged in stacks or groups, e.g. stacked or nested for horizontally placed articles, i.e. for stacked or nested articles the articles being substantially flat panels, e.g. wooden planks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/30—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure
    • B65D85/48—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure for glass sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G49/00—Conveying systems characterised by their application for specified purposes not otherwise provided for
    • B65G49/05—Conveying systems characterised by their application for specified purposes not otherwise provided for for fragile or damageable materials or articles
    • B65G49/06—Conveying systems characterised by their application for specified purposes not otherwise provided for for fragile or damageable materials or articles for fragile sheets, e.g. glass
    • B65G49/068—Stacking or destacking devices; Means for preventing damage to stacked sheets, e.g. spaces
    • B65G49/069—Means for avoiding damage to stacked plate glass, e.g. by interposing paper or powder spacers in the stack
    • 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
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/025—Polyolefin
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2218/00—Methods for coating glass
    • C03C2218/30—Aspects of methods for coating glass not covered above
    • C03C2218/355—Temporary coating

Definitions

  • the present invention relates to packaging of inorganic sheet materials such as glass sheets.
  • the present invention relates to processes for packaging and protecting surfaces of glass sheets from scratching and contaminants.
  • the present invention is useful, e.g., for packaging and protecting pristine surfaces of LCD glass substrates.
  • Glass substrates for the manufacture of LCD displays are required to have pristine surfaces essentially free of scratches and surface particles.
  • the packaging and shipping of such glass sheets have presented significant challenges due to the fact that the materials and process steps involved may cause surface degradation and introduce contaminant thereto. This is especially true for long-distance shipping.
  • the desire to lower the cost of shipping means that glass sheets should be packaged as densely as possible.
  • FIG. 1 Various methods were used for the packaging of LCD glass substrates.
  • three layers of sheets were used between adjacent glass sheets 101 and 103, including two polymer outer sheets 105 and 107 coated onto the surfaces of the glass sheets 101 and 103, respectively and a paper layer 113 sandwiched between the two polymer layers.
  • the approach requires a polymer film coater and polymer films when packing and a film peeler to remove the coated polymer films when de-packing.
  • each aspect is illustrated by a number of embodiments, which, in turn, can include one or more specific embodiments. It is to be understood that the embodiments may or may not overlap with each other. Thus, part of one embodiment, or specific embodiments thereof, may or may not fall within the ambit of another embodiment, or specific embodiments thereof, and vice versa.
  • a first aspect of the present invention relates to a method of protecting glass sheets from scratching and stains comprising:
  • both said first and second surfaces have a peel value of less than 5Og relative to said glass sheets and a surface roughness Ra of greater than 0.5 micron.
  • said polymer film comprises a central core layer of polymer foam and two polymer skin layers sandwiching said core layer, and said core layer and said skin layers are integrally formed with each other.
  • said foam core layer includes cells having a size ranging from 0.5 to 20.0 microns.
  • said core layer is formed of medium or high density polyethylene and said skin layers are formed of low density polyethylene, linear low density polyethylene or low density polyethylene copolymer.
  • said polymer film comprises a central core layer and two polymer skin layers sandwiching said core layer, said core layer having a stiffness represented by said polymer of said core layer having a tensile modulus of elasticity of greater than 80 kpsi, and said core layer, and said skin layers are integrally formed with each other.
  • said core layer is formed of polyethylene terephthalate, polystyrene or polypropylene and said skin layers are formed of low density polyethylene, linear low density polyethylene or low density polyethylene copolymer.
  • said polymer film comprises a central core layer of paper and two polymer skin layers sandwiching said core layer, and said core layer and said skin layers are integrally formed with each other.
  • said skin layers are formed of low density polyethylene, linear low density polyethylene or low density polyethylene copolymer.
  • said polymer film comprises a unitary layer of polymer foam formed of polyethylene, polypropylene, polystyrene or biaxially oriented polypropylene.
  • said foam core layer includes cells having a size ranging from 0.5 to 20.0 microns.
  • the method comprises repeating said steps of positioning said polymer film and placing an additional said glass sheet against said polymer film until a stack of said glass sheets is arranged with said polymer film between adjacent said glass sheets.
  • said skin layers include a long chain fatty ester or a long chain fatty amide slip agent.
  • said slip agent is present on said first surface and said second surface in an amount ranging from 100 to 5000 ppm.
  • said slip agent comprises erucamide.
  • said polymer film has a total thickness range from about 60 to 300 microns.
  • said polymer film comprises a central polymer core layer and two polymer skin layers sandwiching said core layer, and said core layer and said skin layers are integrally formed with each other, said polymer of said skin layers have a tensile modulus of elasticity ranging from 20 to 80 kpsi, said polymer of said core layer has a tensile modulus of elasticity of at least 80 kpsi.
  • a thickness of each of said skin layers ranges from about 20 to 100 microns.
  • a thickness of said core layer ranges from about 20 to 100 microns.
  • said surface roughness Ra ranges from 1.5 to 15 microns.
  • said first and second surfaces of said polymer film are characterized by a presence of undulations of a size much greater than the surface roughness Ra of said polymer film.
  • said slip agent functions as a barrier layer to protect said glass sheets from staining by components in said skin layer.
  • One of more aspects and/or embodiments of the present invention has one or more of the following advantages.
  • First, the use of a separation polymer film having the stated structure does not require the lamination of a polymer film onto a glass sheet surface when packaging or the delamination thereof from the glass surface when de- packaging.
  • FIG. 1 schematically illustrates a prior art surface protection solution using polymer films coated on glass with a sheet of paper sandwiched between the film (a three-layer system);
  • FIG. 2 schematically illustrates a first embodiment of the present invention using a film comprising a central foam core layer sandwiched by two polymer skin layers between adjacent glass sheets;
  • FIG. 3 schematically illustrates a second embodiment of the present invention using a film comprising a central core layer sandwiched by two polymer skin layers wherein the core layer is stiffer than the skin layers, between adjacent glass sheets;
  • FIG. 4 schematically illustrates a third embodiment of the present invention using a film comprising a central paper core layer sandwiched by two polymer skin layers, between adjacent glass sheets;
  • FIG. 5 schematically illustrates a fourth embodiment of the present invention using a separation film comprising a unitary foam layer between adjacent glass sheets.
  • This disclosure features a method of protecting glass sheets from scratching and contamination using a polymer film.
  • a polymer film may be interpreted to have a smaller thickness than polymer sheet, the terms polymer film and polymer sheet are used interchangeably in this disclosure.
  • the interleaf polymer film has a low adherence to the glass and has a surface roughness sufficient to provide air pockets that protect the glass from scratches via cushioning and help separate the glass sheets during unpackaging.
  • a soft polymer low density polyethylene or linear low density polyethylene
  • a first surface of the polymer film is positioned in contact with a major surface of the glass sheet.
  • An additional glass sheet is placed against the polymer film such that a major surface of the additional glass sheet contacts a second surface of the film.
  • Both of the first and second surfaces of the film have a peel value of less than 5Og (grams) relative to the glass sheets and a surface roughness Ra of greater than 0.5 micron (0.5 xl O 6 meters). This peel value is produced according to a procedure by the assignee, Corning, Inc., described below.
  • One embodiment of the method features using a polymer film comprising a central core layer of polymer foam and two polymer skin layers sandwiching the core layer.
  • the core layer and skin layers are integrally formed with each other.
  • the foam core layer can include cells having a size ranging from 0.5 to 20.0 microns or greater.
  • the core layer can be formed of low, medium or high density polyethylene, preferably medium density polyethylene.
  • the skin layers are formed of low density polyethylene, linear low density polyethylene or low density polyethylene copolymer, preferably low density polyethylene.
  • Another embodiment of the method uses a polymer film comprising a central core layer and two polymer skin layers sandwiching said core layer.
  • the core layer is stiffer than the skin layers and the polymer of the core layer has a stiffness represented by a tensile modulus of elasticity of greater than 80 kpsi, in particular, greater than 100 kpsi (ASTM D638).
  • the core layer and skin layers are integrally formed with each other.
  • the core layer is formed of polyethylene terephthalate (PET), polystyrene or polypropylene.
  • the skin layers are formed of low density polyethylene, linear low density polyethylene or low density polyethylene copolymer.
  • Another embodiment of the method uses a polymer film comprising a central core layer of paper and two polymer skin layers sandwiching the core layer.
  • the core layer and skin layers are integrally formed with each other.
  • the skin layers are formed of low density polyethylene, linear low density polyethylene or low density polyethylene copolymer.
  • Yet another embodiment of the method uses a polymer film comprising a unitary layer of polymer foam formed of polyethylene, polypropylene, polystyrene or biaxially oriented polypropylene (BOPP).
  • the foam core layer includes cells having a size ranging from 0.5 to 20.0 microns.
  • the skin layers and core layer are considered to be sublayers of the polymer film.
  • additional protective layers may exist over the surface of the glass sheet to be protected in certain embodiments of the present invention.
  • the polymer (before being formed into the skin layer of the film) can have a lower tensile modulus of elasticity ranging from 20 to 80 kpsi (ASTM D638), for example.
  • the higher tensile modulus of elasticity of the core layer can be 80 kpsi, in particular, greater than 100 kpsi (ASTM D638).
  • the polymer film comprising a unitary layer of foam it can have either the lower or higher tensile modulus of elasticity, preferably the higher tensile modulus of elasticity.
  • the appropriate tensile modulus of elasticity is that which makes for easy handling of the polymer sheet during loading and unloading processes.
  • the steps of positioning the polymer film and placing an additional glass sheet against the polymer film are repeated until a stack of glass sheets is arranged with the polymer film between adjacent glass sheets.
  • the skin layers can include a long chain fatty ester or a long chain fatty amide slip agent.
  • the slip agent can be present on each of the first and second surfaces of the polymer film in an amount ranging from 100 to 5000 ppm.
  • One specific slip agent is erucamide.
  • the polymer film can have a total thickness ranging from about 60 to 300 microns, and, in certain embodiments, from 60 to 120 microns.
  • the polymer film can comprise a central core layer and two polymer skin layers sandwiching the core layer; the core layer and skin layers are integrally formed with each other.
  • the skin layer and core layer can have the lower and higher moduli of elasticity, respectively, described above.
  • a thickness of each of the skin layers can range from about 20 to 100 microns, and, in certain embodiments, from 20 to 40 microns.
  • a thickness of the core layer can range from about 20 to 100 microns, and, in certain embodiments, from 20 to 40 microns.
  • a slip agent provides surface lubrication during and immediately following processing polymer film materials containing the slip agent. If compounded into the polymer film material, the slip agent acts as an internal lubricant that gradually migrates to the surface where it is presented. In this disclosure the lubrication is provided to surfaces of glass sheet that contact the polymer film material containing the slip agent.
  • the polymer film of this disclosure offers advantages. First, unlike the
  • Visqueen film it is not laminated onto the glass sheet and thus, does not require a polymer film coater and a film peeler, which adds extra process steps and increases manufacturing costs. Because the polymer film of this disclosure has a specific surface roughness Ra and low peel value as discussed in the peel procedure below, it does not have the disadvantage of adhering strongly to glass. Also, the polymer film of this disclosure protects glass from scratching better than Glassine paper.
  • the polymer film of this disclosure can be used when packing glass with unground edges for shipment or when packing glass with ground edges for shipment using Coming's DensePakTM process.
  • a first surface of the polymer film is positioned in contact with a major surface of the glass sheet.
  • An additional glass sheet is placed against the polymer film such that a major surface of the additional glass sheet contacts a second surface of the film.
  • Both of the first and second surfaces of the film have a peel value of less than 5Og (grams) relative to the glass sheets and a surface roughness Ra of greater than 0.5 micron (0.5 xlO "6 meters).
  • the polymer film can include a central core layer sandwiched by two skin layers.
  • the polymer of the softer skin layer has a tensile modulus of elasticity ranging from 20 to 80 kpsi.
  • the polymer e.g., of the core layer
  • the polymer can have a tensile modulus of elasticity of greater than 80 kpsi. In the case of the unitary layer of foam 501, it can have the lower or higher tensile modulus of elasticity values described herein, preferably the lower value.
  • the polymer film has a total thickness ranging from about 60 to 300 microns. A thickness of each of the skin layers can range from about 20 to 100 microns. A thickness of the core layer can range from about 20 to 100 microns.
  • the peel value referred to in this disclosure is based on the peel strength test for adhesiveless film by the assignee, Corning Inc., described below.
  • the polymer film can be one of four variations as seen in Figs. 2-5.
  • Each of the polymer films 200 in the embodiment illustrated in FIG. 2 comprises a central foam core layer 201 and two outer polymer skin layers 203 sandwiching the core layer.
  • the skin layers have first and second outer surfaces 205, 207 with a low adhering capability with respect to a flat surface of an inorganic glass material.
  • the skin layers can also include a slip agent providing slip functionality.
  • the core layer has outer surfaces 209, 211 that contact inner surfaces 213, 215 of the skin layers, the outer core layer surfaces having a micro or macro cellular structure for cushioning.
  • the polymer films are shown in an exploded view relative to the glass sheets of a stack (glass sheets 101, 103 and 217).
  • the outer skin layer surfaces 205, 207 would contact the inner surfaces 109, 111 of the glass sheets 101, 103 of a first pair of adjacent glass sheets of glass and the outer surfaces 205, 207 would contact inner surfaces 219, 221 of the glass sheets 103, 217 of a second pair of adjacent glass sheets of the stack, and so on, for the remaining polymer films and glass sheets of the stack.
  • the polymer for the skin layers is a low density polyethylene (e.g., having a density of less than 0.93g/cm 3 ), linear low density
  • the polymer for the core layer is a low density polyethylene, a medium density polyethylene (e.g., having a density of about 0.94 g/cm 3 ) or a high density polyethylene (e.g., having a density of 0.94 to 0.97 g/cm 3 ), preferably a medium density polyethylene.
  • the foam of the core layer has cell structures each having a size in a range of about 0.5 to 20.0 microns or larger.
  • Chemical foaming agents that can be used in making the foam of the core layer include, for example, azodicarbonamide; modified azodicarbonamide; 4,4-oxibis(benzenesulfonyl hydrazide); trihydrazinotriazaine. Other chemical foaming agents known in the art could also be used.
  • Physical foaming agents that can be used to make the foam include, for example, nitrogen or halogenated hydrocarbons.
  • Each of the polymer films 300 of the embodiment illustrated in FIG. 3 comprises a central polymeric core layer 301 and two outer polymer skin layers 303 sandwiching the core layer.
  • the skin layers have first and second outer surfaces 305, 307 with a low adhering capability with respect to a flat surface of an inorganic glass material.
  • the skin layers can also include a slip agent providing slip functionality.
  • the core layer comprises a layer of polymer different from and having a greater stiffness than the skin layer polymer. Outer surfaces 309, 311 of the core layer contact inner surfaces 313, 315 of the skin layers.
  • the first outer surface 305 of the skin layers contacts an inner glass surface 109 of a glass sheet 101 of a first pair of glass sheets of the stack while the second outer surface 307 of the skin layers contacts an inner glass surface 111 of an adjacent glass sheet 103.
  • the first outer surface 305 of the skin layers contacts an inner glass surface 219 of the glass sheet 103 of a second pair of glass sheets of the stack while the second outer surface 307 of the skin layers contacts an inner glass surface 221 of an adjacent glass sheet 217.
  • the alternating of polymer films and glass sheets would continue throughout the stack.
  • the polymer for the skin layers is a low density polyethylene (e.g., having a density of less than 0.93 g/cm ), linear low density polyethylene or low density polyethylene copolymer.
  • the polymer for the core layer is stiff polystyrene, polypropylene or PET.
  • a low stiffness of the skin layers is reflected by a skin layer polymer having a tensile modulus of elasticity ranging from 20 to 80 kpsi at room temperature (in particular from about 30 to 60 kpsi).
  • a stiffness of the core layer is reflected by a stiff core layer polymer having a tensile modulus of elasticity of greater than 80 kpsi at room temperature (in particular greater than 150 kpsi).
  • the stiffness of the core layer is such that the mechanical tool that uses suction and mechanical clippers to hold the polymer film can handle the film easily.
  • Each of the polymer films 400 of FIG. 4 includes a central paper core layer
  • the skin layers have first and second outer surfaces 405, 407 with a low adhering capability with respect to a flat surface of an inorganic glass material.
  • the skin layers can also include a slip agent providing slip functionality.
  • the polymer for the skin layers is a low density polyethylene (e.g., having a density of less than 0.93 g/cm 3 ), linear low density polyethylene or low density polyethylene copolymer.
  • the paper can be any suitable paper that provides cushioning, for example Kraft paper or paper described in publication WO 2008/002584, which is incorporated herein by reference. The paper provides stiffness and cushioning due to its porosity.
  • the paper has outer surfaces 409, 411 that contact inner surfaces 413, 415 of the skin layers.
  • the first outer surface 405 of the skin layers contacts an inner glass surface 109 of a glass sheet 101 of a first pair of glass sheets of the stack while the second outer surface 407 of the skin layers contacts an inner glass surface 111 of an adjacent glass sheet 103.
  • the first outer surface 405 of the skin layers contacts an inner glass surface 219 of the glass sheet 103 of a second pair of glass sheets of the stack while the second outer surface 407 of the skin layers contacts an inner glass surface 221 of an adjacent glass sheet 217.
  • the alternating of polymer films and glass sheets would continue throughout the stack.
  • the polymer film of FIG. 5 comprises a unitary layer of polymer foam
  • the foam is made of polyethylene, polystyrene, polypropylene or biaxially oriented polypropylene (BOPP).
  • the foaming agent used to make the foam can be the same as the foaming agents used to produce the foam of the polymer film 200 of FIG. 2. However, when making the foam using BOPP, no foaming agents are used; rather the foam is created by stretching.
  • the foam has outer surfaces 503, 505. In a stack under a compressive load, the first outer surface 503 contacts an inner surface 109 of glass sheet 101 of a first pair of glass sheets of the stack while the second outer surface 505 contacts an inner surface 111 of an adjacent glass sheet 103.
  • the first outer surface 503 contacts an inner surface 219 of glass sheet 103 of a second pair of glass sheets of the stack while the second outer surface 505 contacts an inner surface 221 of an adjacent glass sheet 217.
  • the alternating of polymer films and glass sheets would continue throughout the stack.
  • the polymer films have properties making them suitable for providing scratch protection to glass sheets. All of the films described herein can have one or more of the following properties.
  • the polymer film can be used with and without slips agents.
  • the slip agent can migrate out of the polymer and presents on both outer surfaces of the film (i.e., from the outer surfaces of the skin layers or the outer surfaces 503, 505 of the foam layer 501).
  • Each side of the polymer film has a low adhering capability with respect to a flat surface of an inorganic glass material of less than 50 g (e.g., from 0 up to 5Og) according to a peel test described below.
  • a surface roughness Ra of the outer surface of each skin layer is greater than 0.5 micron, in particular in a range of 1.5 to 15 microns.
  • the Ra value is an arithmetic average height of peaks of polymeric material on a surface of the polymer films.
  • one side of Visqueen film has been known to have a lower surface roughness Ra or a mirror finish in a range of 0.005 to 0.025 microns.
  • the core layers can provide the skin layers with undulations on the surface on a scale much larger than a surface roughness Ra of the skin layers as disclosed herein.
  • these undulations can be provided by the cells of the foam in polymer films 200 and 501 (Figs. 2 and 5), the core layer of polymer film 300 (FIG. 3) and by the paper 400 (FIG. 4).
  • a thickness of the entire film can range from 60 to 300 microns (e.g., 60 to 120 microns).
  • the skin layers can each have a thickness in a range of 20 to 100 microns (e.g., 20 to 40 microns) and the core layers can have a thickness ranging from 20 to 100 microns (e.g., 20 to 40 microns).
  • the thickness of the film components advantageously enables material having a given stiffness to balance different levels of softness and hardness that suit the particular shipping and packaging equipment with potential effects on levels of scratching.
  • Providing stiffness of the polymer film so high they are self standing is not a requirement because a delivery system holds the film with suction and mechanical clippers during loading of the film into the stack of glass sheets.
  • a function of the polymer film is to prevent scratching by trapping and/or absorbing particles on the surface of the glass, such as glass chips, into the soft outer skin layers of the film. This scratch protection would occur during a compressive loading of the stack of glass sheets on the films.
  • the particles can be submicron and greater in size.
  • the particles can be absorbed by the core layer as well.
  • Slip agents migrate out of the polymer and are presented on outer surfaces of the film into contact with adjacent glass sheets on both sides of the film. The slip agents may permit particles to slide on the slip agent material rather than against the bare glass. No other layers of material besides the polymer film are necessary between adjacent glass sheets (i.e., no paper and no laminated coatings on the glass), though the inclusion of which is not ruled out.
  • Compounds that might be suitable as slip agents include at least one long chain fatty acid ester or fatty acid amide.
  • the long chain fatty acid esters and fatty acid amides of this disclosure are derivatives of saturated and unsaturated normal fatty acids ranging from fourteen to thirty-six carbon atoms.
  • Representative fatty acids are, for example, tetradecanoic, pentadecanoic, hexadecanoic, heptadecanoic, octadecanoic, nonadecanoic, eicosanoic, hencosanoic, decosanoic, tetracosanoic, pentacosanoic, tricosanoic, hexacosanoic, triacontanoic, dotriacontanoic, tetratriacontanoic,
  • hentriacontanoic pentatriacontanoic, hexatriacontanoic acids, myristic, palmitic, stearic, arachidic, behenic and hexatrieisocontanoic (C 36 ) acids, oleic, palmitoleic, linolenic and cetoleic, and the like.
  • suitable slip agent might include one or more of the following: unsaturated fatty acid monoamide (e.g., oleamide, erucamide, recinoleamide); saturated fatty acid monoamide (preferably, lauramide, palmitamide, arachidamide, behenamide, stearamide, 12 hydroxy stearamide); N-substituted fatty acid amide (e.g., N-stearyl stearamide, N-behenyl behenamide, N- stearyl behenamide, N-behenyl stearamide, N-oleyl oleamide, N-oleyl stearamide, N- stearyl oleamide, N- stearyl erucamide, erucyl erucamide, erucyl stearamide, stearyl erucamide, N-oleyl palmitamide); methylol amide (e.g., methylol stearamide, N-stearyl steamide, N-steary
  • saturated fatty acid bis- amide e.g., methylene bis-stearamide, ethylene bis-stearamide, ethylene bis- iso stearamide, ethylene bis-hydroxystearamide, ethylene bis stearamide, ethylene bis- behenamide, hexamethylene bis-stearamide, hexamethylene bis-behenamide,
  • fatty amides that may be suitable are erucamide, stearamide, oleamide and behenamide.
  • Fatty amides are commercially available from Humko Chemical Company and include, for example Kemamide S (stearamide), Kemamide U (oleamide), Kemamide E (erucamide).
  • fatty amides are commercially available from Croda Universal Ltd., and include, for example, Crodamide OR (oleamide), Crodamide ER (erucamide), Crodamide SR (stereamide), Crodamide BR (behenamide).
  • the slip agent on the film surface acts as a barrier layer in preventing migratory low molecular organic components in the polymer resin, which would be potential sources of organic stains.
  • Any slip agent present on the glass is washed off at the finishing line using known washing processes including brushes, ultrasound, water jet spraying, and a detergent at a pH of 10-12 (e.g., a potassium hydroxide detergent).
  • the slip agent can be provided into the polyethylene resin directly as a powder or mixed as a master batch that is then added to the entire polyethylene batch.
  • the polymer film can be made by casting or blown film processes as known in the art. In the casting process the film is extruded onto a cooling or chilling roll and then passes onto a rubber nip roll which provides the film with suitable surface roughness Ra.
  • Uncoated glass samples are placed on a clean work surface. The glass samples are cleaned. Uncontaminated and untouched 5"x5" samples of film are placed on the glass and rolled with a 10-pound (about 4.5-kg) roller using only two roller strokes.
  • the equipment includes a sample jig on a platform of a TA.XT Texture Analyzer, tensile strength tester. A universal joint is attached to the texture analyzer arm and an S-hook is hung on it. Scotch® double-sided tape is applied to all four edges of a 0.25" thick, 4" square aluminum plate. The plate is suspended by the S-hook via fishing line using four eyehooks at the corners of the plate. The plate is aligned with the brackets and lowered to about 1 mm above the surface.
  • the prepared glass/film sample is centered below the plate.
  • the plate is lowered on top of the glass and film.
  • Four film edges are secured to the double sided tape on the plate, insuring good contact.
  • the sample is slid into the brackets and the glass is tightened to the platform.
  • the device measures force when the plate is pulled up at a rate of 0.2 mm/sec.
  • the plate must be flat at the end of the run.
  • the force needed to lift off the film from the glass is measured and recorded in grams as the peel value.
  • SL polymer film Glass surfaces contacting one polymer film imbibed with erucamide
  • the polymer film sample included three sub-layers, one being a central medium density polyethylene core layer.
  • the core layer was made of a foam.
  • Two outer skin layers of low density polyethylene sandwiched the core layer.
  • the total film thickness ranged from about 110 to 120 microns.
  • the skin layers were formulated with erucamide in an amount of 500 ppm. This is the polymer film 200 shown in FIG.
  • Defects are measured by passing a strobing light onto the glass and locating the defects using a scanning camera.
  • Controllable yield is defined as the percentage of glass sheets that passed the quality criteria among the total number of glass sheets tested.
  • Table 2 shows that the polymer sheet 200 had very good yield and low defect counts compared to the Glassine paper, comparable to that of the Visqueen material.

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  • Engineering & Computer Science (AREA)
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  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Ceramic Engineering (AREA)
  • Laminated Bodies (AREA)
  • Packaging Frangible Articles (AREA)
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  • Wrappers (AREA)
  • Surface Treatment Of Glass (AREA)

Abstract

La présente invention concerne un procédé destiné à protéger des plaques de verre des rayures et salissures. Une première surface d’un film de polymère est positionnée au contact d’une surface principale d’une plaque de verre. Une plaque de verre supplémentaire est placée contre le film de polymère de telle manière qu’une surface principale de la plaque de verre supplémentaire touche une deuxième surface du film. Les première et deuxième surfaces du film présentent toutes deux une valeur de décollement inférieure à 50 g par rapport aux plaques de verre et une rugosité de surface Ra supérieure à 0,5 micron. Le procédé est en mesure d’empêcher les rayures sur une surface vitrée issue du bas d’un lot de production, aussi bien pendant l’expédition entre les usines de mise en forme du verre que pendant l’expédition et la manipulation en relation avec les clients d’usines de transformation du verre.
PCT/US2010/041466 2009-07-10 2010-07-09 Film de polymère pour protéger des plaques de verre WO2011006031A2 (fr)

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CN2010800353408A CN102596768A (zh) 2009-07-10 2010-07-09 用于保护玻璃板的聚合物薄膜
JP2012519749A JP5723877B2 (ja) 2009-07-10 2010-07-09 ガラス板を保護するための高分子フイルム
KR1020127003538A KR101819758B1 (ko) 2009-07-10 2010-07-09 유리 시트 보호용 폴리머 필름

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US8586188B1 (en) 2012-11-28 2013-11-19 Corning Incorporated Protective films or papers for glass surfaces and methods thereof
JP2015131684A (ja) * 2014-01-09 2015-07-23 コーニング精密素材株式会社Corning Precision Materials Co., Ltd. ガラス基板の包装方法
US9315412B2 (en) 2011-07-07 2016-04-19 Corning Incorporated Surface flaw modification for strengthening of glass articles
US20160280445A1 (en) * 2014-08-26 2016-09-29 Shenzhen China Star Optoelectronics Technology Co., Ltd. Light polarization film, packaging structure and method for liquid crystal glass
US20160311202A1 (en) * 2015-04-27 2016-10-27 Jsp Corporation Laminated foam interleaf sheet for glass plates
US9488857B2 (en) 2014-01-10 2016-11-08 Corning Incorporated Method of strengthening an edge of a glass substrate
US9919949B2 (en) 2012-12-21 2018-03-20 Nippon Electric Glass Co., Ltd. Strengthened glass, strengthened glass plate, strengthened glass container, and glass for strengthening
US10124564B2 (en) 2014-03-05 2018-11-13 Jsp Corporation Multi-layer foam sheet and interleaf sheet for glass plates
WO2020154286A1 (fr) * 2019-01-22 2020-07-30 Tredegar Surface Protection, Llc Films destinés à être utilisés comme intercalaires entre substrats
US11192338B2 (en) 2017-10-12 2021-12-07 Tredegar Surface Protection, Llc Films for use as interleaves between substrates

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CN102774575B (zh) * 2012-08-09 2015-04-29 天津南玻节能玻璃有限公司 一种玻璃包装方法
CN106076893B (zh) * 2016-07-29 2018-06-19 芜湖市振华戎科智能科技有限公司 一种加密光盘生产线的印刷输送装置
KR20200111327A (ko) * 2019-03-18 2020-09-29 삼성디스플레이 주식회사 트레이 모듈, 이를 포함하는 트레이 조립체 및 이를 이용한 표시 장치 제조 방법
KR102646514B1 (ko) * 2022-01-11 2024-03-13 동원시스템즈 주식회사 유리 보호 필름

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9315412B2 (en) 2011-07-07 2016-04-19 Corning Incorporated Surface flaw modification for strengthening of glass articles
US8586188B1 (en) 2012-11-28 2013-11-19 Corning Incorporated Protective films or papers for glass surfaces and methods thereof
US9919949B2 (en) 2012-12-21 2018-03-20 Nippon Electric Glass Co., Ltd. Strengthened glass, strengthened glass plate, strengthened glass container, and glass for strengthening
JP2015131684A (ja) * 2014-01-09 2015-07-23 コーニング精密素材株式会社Corning Precision Materials Co., Ltd. ガラス基板の包装方法
US9488857B2 (en) 2014-01-10 2016-11-08 Corning Incorporated Method of strengthening an edge of a glass substrate
US10124564B2 (en) 2014-03-05 2018-11-13 Jsp Corporation Multi-layer foam sheet and interleaf sheet for glass plates
US10569512B2 (en) 2014-03-05 2020-02-25 Jsp Corporation Multilayer foam sheet and interleaf sheet for glass plates
US20160280445A1 (en) * 2014-08-26 2016-09-29 Shenzhen China Star Optoelectronics Technology Co., Ltd. Light polarization film, packaging structure and method for liquid crystal glass
US20160311202A1 (en) * 2015-04-27 2016-10-27 Jsp Corporation Laminated foam interleaf sheet for glass plates
US10814594B2 (en) * 2015-04-27 2020-10-27 Jsp Corporation Laminated foam interleaf sheet for glass plates
US11192338B2 (en) 2017-10-12 2021-12-07 Tredegar Surface Protection, Llc Films for use as interleaves between substrates
WO2020154286A1 (fr) * 2019-01-22 2020-07-30 Tredegar Surface Protection, Llc Films destinés à être utilisés comme intercalaires entre substrats
US11230417B2 (en) 2019-01-22 2022-01-25 Tredegar Surface Protection, Llc Films for use as interleaves between substrates

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JP2012532806A (ja) 2012-12-20
KR101819758B1 (ko) 2018-01-17
TW201114604A (en) 2011-05-01
TWI494227B (zh) 2015-08-01
KR20120089233A (ko) 2012-08-09
JP5723877B2 (ja) 2015-05-27
CN107053796A (zh) 2017-08-18
CN102596768A (zh) 2012-07-18
WO2011006031A3 (fr) 2011-03-03

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