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  • 1
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    Vacuum powder injector and method of impregnating fiber with powder (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A method and apparatus uniformly impregnate stranded material with dry powder such as low solubility, high melt flow polymer powder to produce, for example, composite prepregs. The stranded material is expanded in an impregnation chamber by an influx of air so that the powder, which may enter through the same inlet as the air, penetrates to the center of the stranded material. The stranded material then is contracted for holding the powder therein. The stranded material and powder may be pulled through the impregnation chamber in the same direction by vacuum. Larger particles of powder which do not fully penetrate the stranded material may be combed into the stranded material and powder which does not impregnate the stranded material may be collected and reused.
    Keywords: ENGINEERING (GENERAL)
    Format: application/pdf
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