Plastic and nonmetallic article shaping or treating: processes – Direct application of electrical or wave energy to work – Conveying or aligning particulate material
Patent
1997-04-07
1999-04-20
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Direct application of electrical or wave energy to work
Conveying or aligning particulate material
118 36, 118308, 118312, 118630, 118634, 118712, 156166, 156173, 156175, 156180, 156250, 1562726, 1562731, 1563796, 156441, 156510, 264131, 264140, 425 90, 425135, 4251748E, 425289, 427185, 427195, 427289, 4273935, 427424, 427461, 427482, 427485, B29C 3510, B29C 7020
Patent
active
058956220
ABSTRACT:
A composite manufacturing system moves a multi-fiber tow through a processing space. A resin particle source provides particles to the space. This source may include an airstream entrained with particles which is discharged into the space through an orifice; the airstream diverging as it enters the space. An electrode is disposed in the space to electrostatically charge the particles and facilitate deposition of the charged particles on the tow. In one embodiment, the electrode includes a corona wire disposed proximate to the tow to provide a generally cylindrical charging region. An electric field useful to direct deposition of the particles may be generated by appropriately shaping a wire electrode and orienting it in a predetermined manner relative to the tow. After the particles are deposited, a fixation unit may be used to at least partially melt the deposited particles. A processing stage may be included which has a pair of surfaces configured to heat and compress the tow therebetween. Multiple post-deposition processing stages to heat and compress the tow may be employed to improve resin impregnation among fibers of the tow.
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Karthik Ramani and Mark Duvall, In-situ Composite Manufacture Using Electrostatic Powder Spray Processing and Filament Winding, Submitted to National Science Foundation under Grant No. PDM-9308498, (Jan. 1996).
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Duvall Mark Stephen
Ramani Karthik
Woolard Daniel Edward
Purdue Research Foundation
Tentoni Leo B.
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