Method of manufacturing containment bladders
A method of manufacturing a seamless, non-wicking containment bladder includes providing yarn materials, coating the yarn materials with a precursor protective coating, loading the yarn materials into an additive manufacturing process, depositing the yarn materials in pre-selected amounts and locations to form a desired structure, forming and heat-setting, and coating the seamless bladder.
1. A method of manufacturing a seamless, non-wicking containment bladder, comprising:
providing yarn materials;
coating the yarn materials with a precursor protective coating;
loading the yarn materials into an additive manufacturing machine; and
depositing the yarn materials in pre-selected amounts and locations to form a desired 3D structure that is seamless, the step of depositing including forming different coating levels at different locations on the containment bladder by depositing a first type of yarn in a body of the containment bladder and reinforcing the first type of yarn with a second type of yarn at one or more of corners of the containment bladder and attachment points on the containment bladder,
wherein the precursor protective coating includes polyvinylidene fluoride.
2. The method of claim 1 , further comprising heat setting the desired 3D structure to produce a final form.
3. The method of claim 2 , wherein heat setting comprises heating the desired 3D structure at about 200° C. to about 500° C.
4. The method of claim 3 , wherein heat setting comprises heating the desired 3D structure for about 1 minute to about 10 minutes.
5. The method of claim 2 , further comprising applying a pressure to the desired 3D structure.
6. The method of claim 5 , wherein the pressure applied to the desired 3D structure is between about −1 bar and about 9 bar.
7. The method of claim 2 , further comprising applying a final exterior coating material or combination of materials to the final form.
8. The method of claim 7 , wherein the final exterior coating material or combination of materials comprises a thermoplastic resin.
9. The method of claim 8 , wherein the final exterior coating material or combination of materials comprises polyvinylidene fluoride.
10. The method of claim 1 , wherein the yarn materials comprise one of aramids, polyether ether ketone (PEEK), HT-Polyester, HT-Nylon, HT-Polypropylene, poly(p-phenylene-2,6-benzobisoxazole) (PBO), carbon-based yarn, meta-aramids, and combinations thereof.
11. The method of claim 10 , wherein the yarn materials comprise thermoplastic yarns.
12. The method of claim 1 , wherein the precursor protective coating further includes thermoplastic, elastomeric resins and alloys, or combinations of resins and alloys.
13. The method of claim 1 , wherein depositing the yarn materials comprises executing a computer aided design program.
14. The method of claim 1 , wherein reinforcing the first type of yarn with the second type of yarn includes reinforcing the first type of yarn with the second type of yarn at corners of the containment bladder.
15. The method of claim 1 , wherein the first type of yarn is a HT-polyethylene terephthalate yarn, and the second type of yarn is an aramid yarn.
16. The method of claim 1 , wherein the step of depositing includes forming different coating levels at different locations on the containment bladder by depositing the first type of yarn in the body of the containment bladder and reinforcing the first type of yarn with the second type of yarn at the corners of the containment bladder.