Re: polyurethane composite bubble problem

mingzong@xxxxxxxxx wrote:
> hi, I am doing a projectof polyurethane-glass fiber composite.
> Although I dryed the glass fiber before it was used, however, when I
> transfer the glass fiber from the oven to the processing machine, it
> absorbs water. The water absorbed by glass fiber react with PU and
> produce bubble in the composite. Does any one know how to get rid of
> the water in the composite? Thanks.

Hopper mounted drying system. -40DP minimum (Desiccant, CDA, Vacuum).
Another way you can go is nitrogen purge on your hopper.


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