Ballistic Personal Protective Equipment (PPE) body armor and methods of producing the same
Disclosed herein apparatus and associated methods relate to body armor comprising a plate having a ceramic tile bonded to front and back polyolefin layers by front and back pretreated prepreg layers. The pretreated prepreg layers may comprise epoxy resin sheets precooled for storage at 0° F. The polyolefin layers may comprise 940 and 1880 denier extruded polyolefin sheets. The stored cold prepreg sheets may be heated and the hot prepreg sheets used to join the ceramic tile with the extruded polyolefin sheets. The ceramic tile may be bonded to the extruded polyolefin sheets by cooling the ceramic tile, extruded polyolefin sheets and hot prepreg sheets in a −58° F. freezer, forming a cooled bonded plate. A backer comprising stacked plastic sheets may be connected to the plate. The cooled bonded plate may be cured by a curing cycle comprising 260° F. and 120 PSI using an autoclave.
1. A method comprising:
heating a cold back prepreg sheet and a cold front prepreg sheet;
forming a plate comprising,
overlaying the back prepreg sheet onto a backside of a ceramic tile, thereby, forming a back prepreg layer;
overlaying a back extruded polyolefin sheet onto the back prepreg layer;
overlaying the front prepreg sheet onto a frontside of the ceramic tile, thereby, forming a front prepreg layer; and
overlaying a front extruded polyolefin sheet onto the front prepreg layer;
cooling the plate to form a cooled bonded plate having a front side and a back side;
connecting a backer to the back side of the cooled bonded plate to form a shield; and
curing the shield using an autoclave, thereby forming body armor.
2. The method of claim 1 , wherein the method further comprises precooling the cold back prepreg sheet and the cold front prepreg sheet at 0° F.
3. The method of claim 1 , wherein the cold back prepreg sheet and the cold front prepreg sheet comprise epoxy resin.
4. The method of claim 1 , wherein heating the cold back prepreg sheet and cold front prepreg sheet comprises heating the cold back prepreg sheet and cold front prepreg sheet using a heating device having a temperature of at least 140° F.
5. The method of claim 1 , wherein the ceramic tile further comprises the ceramic tile having a thickness from 6 mm to 13 mm.
6. The method of claim 1 , wherein the ceramic tile comprises 30% to 60% silicon carbide and 20% to 30% alumina.
7. The method of claim 1 , wherein the ceramic tile comprises 46% silicon carbide and 24% alumina.
8. The method of claim 1 , wherein the ceramic tile frontside has a convex shape and the ceramic tile backside has a concave shape.
9. The method of claim 1 , wherein the back extruded polyolefin sheet and the front extruded polyolefin sheet comprise 1880 denier fabric.
10. The method of claim 1 , wherein the back extruded polyolefin sheet and the front extruded polyolefin sheet comprise 940 denier fabric.
11. The method of claim 1 , wherein cooling the plate comprises cooling the plate in a freezer having a temperature of −58 degrees Fahrenheit.
12. The method of claim 1 , further comprises aligning the backer and the cooled bonded plate.
13. The method of claim 1 , further comprises connecting a foam sheet to the backer back side after the shield is cured.
14. The method of claim 13 , wherein the foam sheet is XLPE FOAM.
15. The method of claim 1 , wherein the backer further comprises a plurality of stacked plastic sheets in mechanical union.
16. The method of claim 15 , wherein the plurality of stacked plastic sheets is 42 plastic sheets.
17. The method of claim 16 , wherein at least one of the plurality of plastic sheets comprises Ultra-High-Molecular-Weight Polyethylene (UHMWP).
18. The method of claim 17 , wherein the UHMWP is HB50 UHMWP.
19. The method of claim 15 , wherein at least one of the plurality of plastic sheets is an extruded polyolefin sheet.
20. The method of claim 1 , wherein the method further comprises placing at least one film sheet in mechanical union with the backer front side.
21. The method of claim 15 , wherein the method further comprises placing at least one film sheet in mechanical union with at least one of the plurality of stacked plastic sheets.
22. The method of claim 20 , wherein the at least one film sheet is T-LINK L-F610 film.
23. The method of claim 1 , wherein curing the shield further comprises placing the shield in a bag and placing the bag in the autoclave.
24. The method of claim 1 , wherein cooling the plate and curing the shield creates a front electric field between the front extruded polyolefin layer and the ceramic tile front side and creates a back electric field between the back extruded polyolefin layer and the ceramic tile back side.
25. The method of claim 24 , wherein the front electric field and the back electric field result from cooling the plate and curing the shield.
26. The method of claim 24 , wherein applying the front electric field to the front prepreg layer as a dielectric between the front extruded polyolefin layer and the ceramic tile front side polarizes the front prepreg layer by aligning orientation of dipole moments in the front prepreg layer, and wherein curing the shield further comprises curing the polarized front prepreg layer while the front prepreg layer is in contact with the front extruded polyolefin layer and the ceramic tile front side.
27. The method of claim 24 , wherein applying the back electric field to the back prepreg layer as a dielectric between the back extruded polyolefin layer and the ceramic tile back side polarizes the back prepreg layer by aligning orientation of dipole moments in the back prepreg layer, and wherein curing the shield further comprises curing the polarized back prepreg layer while the back prepreg layer is in contact with the back extruded polyolefin layer and the ceramic tile back side.
28. The method of claim 1 , wherein curing the shield further comprises increasing and decreasing pressure and temperature over predetermined time intervals.
29. The method of claim 1 , wherein the shield has a shield front side proximal to the plate front side, the shield has a shield back side proximal to the plate back side, and the method further comprises applying polyurea to the shield front side and the shield back side.