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Lightweight transparent armor window

a transparent, armor window technology, applied in protective equipment, transportation and packaging, synthetic resin layered products, etc., can solve the problems of high cost per square inch of these systems, and inability to meet the requirements of large-scale production

Active Publication Date: 2013-11-21
ORAN SAFETY GLASS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a new type of glass-based transparent armor that provides maximum protection against ballistic impact while being relatively thin and light. The armor is made up of multiple layers of glass and polymer that are laminated together to form a composite. The composite must be transparent and optically distortion-free while providing maximum protection against projectiles. The armor can provide multi-hit protection against certain types of projectiles and is useful in military and security vehicles and for windows in secured buildings. The laminate layers are joined together with polymer interlayers, which may be reinforced, and a thin glass layer may be laminated to the backside of the spall layer for added protection.

Problems solved by technology

Systems employing transparent ceramic materials such as, for example, transparent spinel, sapphire, or AlON, show superior ballistic performance over traditional glass-based systems, but are often not available in larger sizes and volumes.
Currently, the cost per square inch for these systems is typically more than 5 times higher than for glass-based systems offering comparable protection.

Method used

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  • Lightweight transparent armor window
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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0082]The following arrangement of laminate layers provides protection against 0.30 cal. AP-M2 projectiles at speeds of up to 2750 fps. The window, without frame, exhibits an areal density of 30 psf or less.[0083]Strike face: SCHOTT BOROFLOAT with a thickness between 4 mm to 6 mm[0084]1st Interlayer: 25 mil PU (Polyurethane) film (Huntsman PE501 or similar)[0085]1st Layer (b): SCHOTT ROBAX Glass Ceramic with a thickness between 7 mm to 8 mm[0086]2nd Interlayer: 25 mil PU film (Huntsman PE501 or similar), or 25 mil PVB (Polyvinylbutyral) film[0087]2nd Layer (b): SCHOTT ROBAX Glass Ceramic with a thickness between 7 mm to 8 mm[0088]3rd Interlayer: 25 mil PU film (Huntsman PE501 or similar), or 25 mil PVB film (Polyvinylbutyral)[0089]3rd Layer (c):[0090]Option A: single-layer SCHOTT BOROFLOAT with a thickness between 18 mm to 21 mm[0091]or[0092]Option B: double-layer SCHOTT BOROFLOAT with a thickness of each individual layer between[0093]9 mm to 11 mm, bonded with 25 mil PVB or PU film...

example 2

Ballistic Test Results

[0101]Small, multi-layer test coupons (100 mm×100 mm) are mounted on a 12″×12″×12 mm thick polycarbonate backing. The samples are tested in a configuration similar to the one shown in FIG. 9. The test projectile is 0.30 cal. AP-M2 at the indicated nominal speed (2250 fps or 2750 fps). Based on the test results, the design described in Example 1 is derived combining the two multi-layer sequences marked with an asterisk in Table 2 to accommodate for scaling.

TABLE 1ABallistic Test Results - 2250 fps impacts by 0.30 cal. AP-M2ShotWeights (Grains)Velocity Data (ft / sec)PenetrationNumberProjectilePropellantNo. 1No. 2AverageDescription / Pen. into PB9-17564162.834.4228322812282No Penetration9-17565163.434.4225922592259No Penetration9-17566163.134.4225422542254No Penetration9-17567163.534.4222222222222No Penetration9-17568163.334.4228422842284No Penetration9-17569163.434.4225722572257No Penetration9-17570163.634.4228122802281No Penetration9-17571163.434.4226822672268No Pe...

example 3

Multi-Hit Example

[0103]Three 500 mm×500 mm test coupons for multi-hit testing are prepared, and tested against an 0.30 cal. AP-M2 round at nominal 2750 fps; the shot pattern is a 120 mm triangle, the shot sequence is 12 O'clock, 4 O'clock and 8 O'clock. The nominal areal density of the samples is 29 psf; due to slight variations in the thickness of the individual glass and glass-ceramic layers, the areal density of the samples as manufactured is 29.7 psf (samples 1 and 2) and 30 psf (sample 3).

The samples have the following structure:

500 mm × 500 mm, edges sealed, framelessSample 1Strikeface6 mm BorofloatInterlayerHuntsman PE-501 - 25 milPly 018 mm Robax Glass-ceramicInterlayerHuntsman PE-501 - 25 milPly 028 mm Robax Glass-CeramicInterlayerHuntsman PE-501 - 25 milPly 0321 mm BorofloatInterlayerHuntsman PE-501 - 25 milPly 048 mm RobaxInterlayerHuntsman PE-501 - 75 milSpall-Layer9 mm PMMA laminated to9 mm PC (Lexan)Sample 2Strikeface6 mm BorofloatInterlayerHuntsman PE-501 - 25 milPly ...

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Abstract

The invention relates to a lightweight transparent armor laminate comprising layers of borosilicate glass, layers of transparent glass-ceramics and a polymer spall layer of polycarbonate and / or polymethyl methacrylate. The layers are bound by polyurethane and / or polyvinylbutyral interlayer films.

Description

[0001]This application claims the benefit of the filing date of U.S. Provisional Application Ser. No. 60 / 975,661 filed Sep. 27, 2007.[0002]Commercially available, glass-based transparent armor typically consists of multiple glass and polymer layers, which are laminated together to form a relatively thick composite. The resulting composite must be transparent and essentially free of optical distortion while providing maximum protection against ballistic impact of projectiles and fragments at minimum weight and minimum cost. Of particular interest are transparent laminates, which restrict the destruction caused by the projectile locally to ensure maximum residual vision and provide protection against multiple hits.[0003]To successfully stop a projectile, impact resistant transparent laminates typically engage various defeat mechanisms, including projectile fragmentation and mass removal by projectile erosion. Systems employing transparent ceramic materials such as, for example, transp...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F41H5/04
CPCF41H5/0407B32B17/10045B32B17/10761B32B17/1077B32B2333/12B32B2369/00B32B17/10119Y10T428/24942Y10T428/31518Y10T428/31601Y10T428/31507
Inventor WEINHOLD, CARSTEN
Owner ORAN SAFETY GLASS INC
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