AU2009251076A1 - Improvements relating to overlays - Google Patents

Abstract

Improvements relating to overlays Abstract: A removable overlay for a window comprising attachment means to maintain the overlay in position wherein the overlay is tinted. Figure 1

Description

Improvements relating to overlays Background of tile invention: Tiaditional glaing systeins are expensive and inflexible as they ate not teadily teinovable. There is a need for a simple, cost effective system to enable adaptation of windows to chan-in- environmental conditions. 5 The reference to any prior art in this specification is not, and should not be taken as, an acknowledgement or any form of suggestion that the prior art forms part of the common general knowledge. Sumnnine-y of tie invelifioni: 10 According to a first aspect of the invention, there is provided a renovable oveilay fot a window comprising attachment means to maintain the overlay in position wherein the overlay is tinted. A removable overlay according to the invention may for example comprise any one or more ot the ollowing chatactetistics 15 a Total luminous reflection from the glass surface shall he at least nominal when measured with an integrating sphere spectrophotometer as referenced by ASTM E-903 and calculated pci ASTM E-308 usig Standatd CTE Source "C" to1 average daylight. * Total transmission of solar ultraviolet radiation of air mass = 2 over the spectral 20 range of 3000 to 300 angittoims in the range 85 0% to 99 9% when measured with an integrating sphere spectrophotometer as referenced by ASTM E-903. * An IR transmission of not more than 10/o and preferably not more than 3% when measured between 900-1000 nanometer s * Luminous efficacy shall be at least Nominal. 25 * Shading coefficient shall be at least nominal (at 60 Degrees) is measured per ASTM E-903 and computed in accordance with the established procedures defined by The ASHRAE Handbook of Fundamentals. 1 Improvements relating to overlays Total Solar Enetgy Rejected shall be at least nommial (at 60 Degrees) as measured per ASTM E-903 and computed in accordance with the established procedures defined by The ASHRAE Handbook of Fundamentals. In some embodiments a removable overlay according to the invention may optionally 5 comprises a film which optionally has a thickness of 350 to 700 micron, or a polycarbonate sheet with optional thickness in the range 2.5 mm to 12 mm, and optionally one of 3.0mm, 4.5mm, 6.0mm, 7.5mm or 10.00mm. In sonic embodiments, the reimovable overlay of the invention is suitable for use with one or more of a building or a vehicle and optionally on the inside or outside. 10 In some embodiments, the removable overlay according to the invention may comprise one or more of the following characteristics: a The attachment means comprising a magnetic strip, or a slidable guide; a An edging (or profile) which at least partially surrounds the perimeter of the overlay (and preferably substantially so) which comprises ABS which is 15 prefeibly extiuded, * A grip to allow ready removal and / or placement or the overlay on a window which is optionally a corner grip and optionally as depicted in Figure 2 herein; * Any one or more of the features descubed herein by reference to Figures 1 to 3. Throughout this specitication (including any claims which tollow), unless the context 20 requires otherwise, the woid 'comprise, and variations such as 'comprises and 'compiisiig, will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps. Bief description of the drawings: 25 Figure 1 is a cross sectional view of a secondary glazing system according to the present invention. Figure 2 is a front elevation view of a secondary glazing system according to the present invention. Figure 3 is an exploded view of a corner section of a secondary glazing system according to 30 the present invention 2 Improvements relating to overlays Detailed description of exemplary eibodiments: It is convenient to describe the invention hecin in relation to particularly picetticd enbodiments. However, the invention is applicable to a wide range of situations and it is to be appreciated that other constructions and arrangements are also considered as falling 5 within the scope of the invention. Various modifications, alterations, variations and or additions to the construction and arrangements described herein are also considered as falling within the ambit and scope of the present invention Figure 1 depicts an existing window or section of door glass (1) with insulating material, sulch as bcading or silicon (3) and ovetlay (2) which comprises polycaibonate sheet with a body 10 tint of a tint film applied. The overlay may comprise any suitable material, for example a security film, such as a heavy duty film, for example of thickness in the range 300 to 900 micron, preferably 350 to 700 micron. Overlay (2) is attached to window frame (3) via sub frame (6) which in this embodiment comprises extruded plastic and is held to frame (3) by screw (7). Magnetic strips (5) serve to 15 attach ovetlay (2), via edging (or profile) (4) to sub ttaie (6) Edging oi. protile (4) may partially surround overlay (2) provided that this is sufficient to enable engagement with window frame (3) in such a way to hold overlay (2) inl place. In some preferred einbodimeints, overlay (2) is substantially surrounded at the perimeter by profile (4) which provides added strength. 20 An overlay according to the present invention may be applied to either the inside or the outside of a window Attachient ieans suitable to an outside attachment may be used in such embodiments. In sonic of these, a simple magnetic strip system as described above will be sufficient. In others, an alternative system, such as a set of guides with which the overlay slidably engages may be required (for example to avoid the overlay being blown away by 25 wind). Figure 2 depicts overlay (9) with corner pieces (10) in this embodiment comprising plastic ABS and profile (12) completely surrounding the perimeter of overlay (9). Also depicted is tinget grip I t which is in this enbodimient placed in a coincr and enables ready application and removal of oveclay (9). 3 Improvements relating to overlays Figure 3 depicts an exploded vieu of one corner of an ovelay system according to the present invention. Overlay (14) is attached to magnetic strip (13) via extruded profile (16) and corner piece (15) is attached around profile (16). A wide variety of optional features may be comprised in an overlay according to the 5 invention, for example: * Optical Grade Perspex - of varying thicknesses, for example 3.0mii, 4.5mm, 6.nin, 7.5mm or 10.00mm a Trim in a wide variety of colours. * Trim made out of extruded ABS plastic. 10 a Corner trim oi all windows made froni ABS plastic. * Corner finger grip made from ABS plastic. a Magnetic strip affixed to rear side of secondary glazing. * Magnetic strip affixed to ABS plastic trim or aluminium trim affixed directly onto window glass. 15 a Two overlays - tint for sunmer and swap Any suitable specifications may be used in relation to the tint of an overlay according to the present intention Tinting has many beneficial ettects, tot example, Lade protection tot furniture, drapes, carpets, reduce glare, reduce ultraviolet rays, further reduce excessive heat 20 gain, lower energy costs. Example 1: Overlay coated with tinted film Film Material According to this embodiment, the Lilm shall bc an optically clcar polyester film containing a plurality of layers and incorporating an acrylic pressure sensitive adhesive 25 on one side and an acrylic abrasion resistant coating on the other. The fihi shall also incorporate Infrared absorbing carbon and/or metal oxide particles. The film shall be uniform without noticeable pin holes, streaks, thin spots, scratches, banding or other optical detects. The variation in total ttansmission across the width, at any portion along the length, shall not exceed 2% over the average. The film shall have a noniinal thickness of 2.0 niils 30 (0002 inches). 4 Improvements relating to overlays Eimissivitv: The eiissivity of the non-adhesive surface of the film shall be 0.73 nominal when measured using a Devices & Services Enissometer Model AE at or near room temperature. U Value: The LT Value of the film applied to 1/4" (6mm) clear glass shall be 1.0 nominal 5 when measured in accordance with test procedures described for Emissivity Transmission - Visible: When applied to 1/4" (6mm) clear glass, the luminous transmittance shall be nominal when measured with an integrating sphere spectrophotometer as referenced by ASTNI E-903 and calculated per ASTM E-309 using Standatd Source "C" tot average daylight. 10 Reflection - Visibles Exterior: When applied to 1/4" (6mm) clear glass, the total luminous reflection from the glass surface shall be nominal when measured with an integrating sphere spectrophotometer as referenced by AST-M E-903 and calculated per ASTM E-306 using Standard CIE Source "C" for average daylight. Reflection - Visible, Interior: When applied to 1/4" (6mm) clear glass, the total luminous 15 reflection from the glass surface shall be nominal when measured with an integrating sphere spectiophotoinetet as retetenced by ASTNI E-903 and calculated pet ASTM E-30S using Standard CIE Source "C" for average daylight. Rejected - I !lttaviolet Light. When applied to 1/4" 6mn) cleat glass, the total ttanslission of solar ultraviolet radiation of air mass = 2 over the spectral range of 3000 to 3600 20 angstroms shall be 99.9% minimum when measured with an integrating sphere spectrophotometer as referenced by ASTM E-903. Rejected - Infrared Light: Film shall have an IR transmission of not more than 3% when measured between 900-1000 nanometers. Luminous Efficacy: When applied to %" (6mm) clear glass, the luminous efficacy (Defined 25 as the ratio of visible light transmission to shading coctticient) shall be Nominal Shading Coefficient: When applied to 1/4" (6mm) clear glass, the shading coefficient shall be nominal (at 60 Dcgrees) as measured pct ASTNI E-903 and coimputed in accordance with the established procedures defined by The ASHRAE Handbook of Fundamentals. Total Solar Energy Rejected - normal and 60 Degree Angle When applied to 1/4" (6min) 30 clear glass, the TSER shall be nominal (at 60 Degrees) as measured per ASTM E-903 and 5 Improvements relating to overlays comiputed ii accordance with the established proceduces defined by The ASHRAE Handbook of Fundamentals. Example 2: Overlay coated with tint ed night Vision film S Scope (Night Vision) NV-IS NV-25 NV-35 NV-45 Thickness milss) 2.5 2.5 2.5 2.5 (inches) 0.0020 0.0020 0.0020 0.0020 Emissivity 0.70 0.72 0.74 0.26 10 U Value 1.04 1.05 1.06 1.06 Visible Light Transmission 1S/. 25% 35% 45% Visible Reflection Intetiot19% 13% 12%a 9% Exterior 43% 29% 1S% 9 % 15 Ultraviolet Transmission <1% <1l% <1l% <1% Shading Coefficient 0.29 0.39 0.49 0.63 Adhesive System: Pressure sensitive, weatherable, acrylate adhesive applied uniformly over surface opposite abrasion resistant coated surface. Viewing filn from a distance of 10 feet (3 m) at angles up to 45 degrees from either side of 20 glass, film shall not appear distorted. Abrasion Resistance: Surface coating resistant to abrasion, with less than 5 percent increase of transmitted light haze resulting per ASTM D1044 using 100 cycles, 500 grams of weight, and CS 1OF Calbiase Wheel Product Data: Mv manufacturer's product data including installation instructions and cleaning 25 methods. 6 Improvements relating to overlays Film Material: Film material consists of an optically clear metallized polyester fin which may be laminated to a clear polyester filn. Provide films with acrylic abrasion-resistant coating over surface of nihi for enhanced durability. Film Color: Derived from metal coating and/or components, and product will not contain 5 conventional dyed polyester. Provide uniform film, without noticeable pin holes, streaks, thin spots, scratches, banding, or other optical defects. Variation in total transmission across width, at any portion along length shall not exceed 2 percent over average Density of film across web is not to exceed plus or minus 2 percent. Provide filn with no evidence of coating voids. 10 specifier note: retain appropiate filin type in subparagraph below. delete film types not required for pro ett. Example 3: Overlay coated with architectural tinted film I Tlttaviolet Rejected (ASTM E 903) Not less than 99 percent 15 Visible Light Transmission (ASTM E 903, ASTM E308): Not more than 75 percent. Visible Light Rejected (ASTM E 903): Not less than 12 percent. Solar Heat Reduction: Not less than 10 percent. Shading Coefficient at 90 Degrees (Normal Incidence) (ASTM E 903): Not less than 0.36. 20 REFERENCES ASHRAE - Anetican Society foi Heating, Retigeration, and Air Conditioiing Engineets, Handbook of Fundamentals, 1997 Edition. AST-M E 34 - Standard Method of Test for Sutfacc Burning Chatacteristics of Building Materials. 25 ASTM E 308 - Standard Reconmiended Practice for Spectophotonmetry and Description of Color in CIE 1931 System. ASTM E 903 - Standard Methods of Test for Solar Absorbance, Reflectance and Transmittance of Materials Using Integrating Spheres. 7 Improvements relating to overlays ASTM G 26 - Standard Practice for Pecfonning Accelerated Outdoor Weatheuizing for Non-metallic Materials Using Concentrated Natural Sunlight. 5 8

Claims (5)

1. A removable overlay for a window comprising attachment means to maintain the overlay in position wherein the overlay is tinted.

2. A removable overlay according to claim 1 comprising any one or more of the following 5 characteristics: a Total luminous rtilection trom the glass surtace shall be at least nommial when ieasurecd with an integrating sphere spectrophotometer as referenced by ASTM E-903 and calculated per ASTM E-30S using Standard CIE Source "C" for average daylight. 10 b. Total transmission of solar ultraviolet radiation of air mass = 2 over the spectral range of 3000 to 3800 angstroms in the range S5.0% to 99.9% when measured with an integrating sphere spectrophotometer as referenced by ASTM E-903. c. An IR transmission of not more than 10% and preferably not more than 3% when measured between 900-1000 nanometer s 15 d. Luminous efficacy shall be at least Nominal. e. Shading coefficient shall be at least nominal (at 60 Degrees) as measured per ASTM E-903 and computed in accordance with the established procedures defied by The ASHRAE Handbook of Fundamentals. t Total Solar Energy Reected shall be at least nominal (at 60 Degrees) as measured 20 pcr ASTM E-903 and computed in accordance with the established procedures defined by The ASHRAE Handbook of Fundamentals.

3. A removable ovelay according to claim 1 which optionally comprises a filn which optionally has a thickness of 350 to 700 micron, or a polycarbonate sheet with optional thickness in the range 2.5 mm to 12 mm, and optionally one of 3.0mm, 4.5mm, 6.0mm, 25 75mm or 10 00mn

4. A removable ovelay according to claim 1 suitable for use with one or more of a building or a vehicle and optionally on the inside or outside.

5. A removable oveday according to any one or more of claims 1 to 4 comprising one or more of the following characteristics: 30 a The attachment means coinprising a iagnetic stip, or a slidable guide, 9 Improvements relating to overlays b. An edging (or profile) which at least partially surrounds the perimeter of the overlay (and preferably substantially so) which comprises ABS which is preferably extruded; c. A grip to allow ready removal and / or placement of the overlay on a window 5 which is optionally a cornit gip and optionally as dtpicttd in Figure 2 lictcin; d. Any one oc more of the features described herein by reference to Figures 1 to 3. 10 10