Blow Molding with Compressed Air (Combustion prevention)

[ryansekela]

I am blow molding thermoplastics using compressed air. I am packing out the material at about 150psi. I ran into a fire at the exhaust needle, I think because of the compressed air at the high pressure. How can I prevent this from happening again, when I know that I cannot decrease the pressure without degrading the quality of the part?

 

[donbhere]

I have some limited experience with injection molding and it seems to me that the properties of your thermoplastic have a lot to do with this process. There are critical temperatures and pressures associated with various plastics and it is important to know the flash points of your materials.

Don

 

[ryansekela]

I believe that the Diesel Effect is created from contaminates in the Compressed Air or contaminates in the mold itself not from the thermoplastic being molded. How do I prevent this from occurring? What steps must be taken to prevent this?