One way bullet-resistant transparent panel
Transparent panels having unidirectional bullet-resisting characteristics contain at least one sheet of glass, several intermediate sheets formed of an acrylic resin or further glass sheets, and an inner sheet formed of a polycarbonate resin. A transparent adhesive bonds the sheets to each other to form the panel. The level of bullet resistance capability is measured according to NIJ standards and the panels have a Level III or Level IV rating.
1. A transparent panel effective for blocking penetration of a bullet, the transparent panel comprising:
a first glass sheet;
a second glass sheet bonded to said first glass sheet;
a first acrylic sheet bonded to said second glass sheet;
a second acrylic sheet bonded to said first acrylic sheet;
a third acrylic sheet bonded to said second acrylic sheet, said first, second and third acrylic sheets each have a thickness in a range of about 7 mm to about 12 mm;
a polycarbonate sheet bonded to said third acrylic sheet;
a first side; and
a second side, the transparent panel meeting National Institute of Justice Standard Level IV and preventing a penetration of the bullet through the transparent panel when fired at said first side, but allowing a penetration of a further bullet through the transparent panel when fired at said second side.
2. The transparent panel according to claim 1 , wherein
said first glass sheet has a thickness in a range of about 4 mm to about 8 mm;
said second glass sheet has a thickness in a range of about 10 mm to about 14 mm; and
said polycarbonate sheet has a thickness in a range of about 4 mm to about 8 mm.
3. The transparent panel according to claim 1 , wherein said first and second glass sheets are annealed glass sheets.
4. The transparent panel according to claim 1 , wherein said sheets are bonded to each other with an adhesive.
5. The transparent panel according to claim 4 , wherein said adhesive is an urethane glue.
6. The transparent panel according to claim 1 , wherein said first glass sheet, said second glass sheet, said first acrylic sheet, said second acrylic sheet, said third acrylic sheet, and said polycarbonate sheet bonded to each other have a shape of a windshield.
7. The transparent panel according to claim 1 , wherein said first glass sheet, said second glass sheet, said first acrylic sheet, said second acrylic sheet, said third acrylic sheet, and said polycarbonate sheet bonded to each other have a curved shape.
8. The transparent panel according to claim 1 , wherein
said first glass sheet has a thickness of about 6 mm;
said second glass sheet has a thickness of about 12 mm;
said first, second and third acrylic gheets each have a thickness of about 9.5 mm; and
said polycarbonate sheet has a thickness of about 6 mm.
9. The transparent panel according to claim 1 , wherein the transparent panel prevents the penetration of an armor piercing bullet fired at said first side.
10. A panel effective for blocking penetration of a 50 caliber bullet, the panel comprising:
a first glass sheet;
a second glass sheet bonded to said first glass sheet, said second glass sheet having a thickness of about 15 mm to about 24 mm;
a third glass sheet bonded to said second glass sheet, said third glass sheet having a thickness of about 15 mm to about 24 mm;
a fourth glass sheet bonded to said third glass sheet;
a fifth glass sheet bonded to said fourth glass sheet;
a polycarbonate sheet bonded to said fifth glass sheet.
11. The panel according to claim 10 , wherein said first to fifth glass sheets are annealed glass sheets.
12. The panel according to claim 10 , wherein all of said sheets are bonded to each other with an adhesive.
13. The panel according to claim 12 , wherein said adhesive is selected from the group consisting of polyvinyl butural copolymers, urethane, and polyester copolymers for bonding said sheets to each other.
14. The panel according to claim 10 , wherein the panel is a transparent panel that does not distort images.
15. The panel according to claim 10 , wherein said first-fifth glass sheets and said polycarbonate sheet have a shape of a windshield.
16. The panel according to claim 10 , wherein said first-fifth glass sheets and said polycarbonate sheet have a curved shape.
17. The panel according to claim 10 , wherein said first glass sheet has a thickness of about 4 mm to about 8 mm.
18. The panel according to claim 10 , wherein said fourth glass sheet has a thickness of about 15 mm to about 24 mm.
19. The panel according to claim 18 , wherein said fifth glass sheet has a thickness of about 8 mm to about 15 mm.
20. The panel according to claim 19 , wherein said polycarbonate sheet has a thickness of about 4 mm to about 8 mm.
21. The panel according to claim 10 , further including a scratch resistant layer applied to said first and fifth sheet layers.
22. The panel according to claim 10 , wherein said first glass sheet has a thickness of about 6 mm.
23. The panel according to claim 22 , wherein said second glass sheet has a thickness of about 19.5 mm.
24. The panel according to claim 23 , wherein said third glass sheet has a thickness of about 19.5 mm.
25. The panel according to claim 24 , wherein said fourth glass sheet has a thickness of about 19.5 mm.
26. The panel according to claim 25 , wherein said fifth glass sheet has a thickness of about 12.5 mm.
27. The panel according to claim 26 , wherein said polycarbonate sheet has a thickness of about 6 mm.