Powder impregnation

Research institute Spreading device Powder coating unit Stabilising unit 

Switzerland Venturi slot tunnel Fluidized bed Oven 

Porcher Textile/ Enichem FIT Pins Fluidized bed Polymer sheath enclosing powder-coated tow 

NASA Langley Pneumatic tow Bubble bed feeder Oven, Vm controlled 

Research Center spreader delivers powder to fluidized bed by measuring electric capacity of tow 

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MW irradiation of graphite powder impregnated with 30 gave 90% 32 after 3 min... 

Janite. A large grain, black blasting powder impregnated with NG. It was used to a limited extent for excavation work on the Isthmus of Corinth in Greece Ref Daniel (1902), p 386... 

Considerable interest exists for the development of powder impregnation methods. In this technique, the resin is applied to the fiber as a dry powder or as a powder carried in a liquid slurry. However, here it is necessary to synthesize a fully imidized PMR prepolymer as a fine powder and thus the PMR concept as such is lost. 

Dry impregnation, wet impregnation, successive impregnation, powder impregnation, preformed carrier impregnation... 

Powder impregnation is a technique in which dry resin powder is applied to the fibres and normally then melt fused. The fibres are spread out mechanically or pneumatically. In various developments, the particles may be electrically charged the fibre tow can be passed through a fluidized bed and aqueous powder dispersions can be used. 

A.K. Mohanty, L.T. Drzal, and M. Misra, Engineered natural fiber reinforced polypropylene composites influence of surface modifications and novel powder impregnation processing. J. Adhes. Sci. Technol. 16,999-1015 (2002). 

Figure 9.20 Illustration of long glass fiber-reinforced polypropylene compounds by (a) melt and (b) powder impregnation process. (From Ref. 173, 1992, with permission from Elsevier Soience.)...

L Ye, V KlinkmuUer, K Friedrich. Impregnation and consolidation in composites made of GF/PP powder impregnated bundles. J Thermoplastic Composite Materials 5 32-48, 1992. 

The impregnation of thermoplastic tow composites is often supported by intermediates which is an important processing step in manufacturing thermoplastic composite parts. In an overview, the totally impregnated intermediates, such as tapes or fiber fabrics, and the semi-impregnated intermediates, such as powder impregnated fiber bundles. 

Compared to other intermediate product forms such as pre-impregnated tows or powder impregnated fibre bundles, commingled yams are attractive because they possess high flexibility, thus allowing the processing of complex shapes (Svensson et al., 1998). 

Rath M, Kreuzberger S and Hinrichsen G (1998) Manufacture of aramid fiber reinforced nylon-12 by dry powder impregnation process, Compos Part A 29 933-938. 

Mortar range is determined by elevation of the barrel and by the addition of increments, small rectangles of powder-impregnated paper which serve as the propdlant cha e. 

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