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  • 1
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    Salivating over chocolate (2007)
    American Institute of Physics
    Details
    Publication Date: 2007-05-01
    Print ISSN: 0031-9228
    Electronic ISSN: 1945-0699
    Topics: Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 2
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    On thermal boundary layer growth on continuous moving belts (1967)
    Wiley
    Details
    Publication Date: 1967-11-01
    Print ISSN: 0001-1541
    Electronic ISSN: 1547-5905
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Published by Wiley on behalf of American Institute of Chemical Engineers.
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    PAPER CURRENT
  • 3
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    Polymer powder prepregging: Scoping study (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Early on, it was found that NEAT LARC-TPI thermoplastic polyimide powder behaved elastoplastically at pressures to 20 ksi and temperatures to 260 degrees celcius (below MP). At high resin assay, resin powder could be continuously cold-flowed around individual carbon fibers in a metal rolling mill. At low resin assay (2:1, C:TPI), fiber breakage was prohibitive. Thus, although processing of TPI below MP would be quite unique, it appears that the polymer must be melted and flowed to produce low resin assay prepreg. Fiber tow was spread to 75 mm using a venturi slot tunnel. This allowed intimate powder/fiber interaction. Two techniques were examined for getting room temperature powder onto the room temperature fiber surface. Electrostatic powder coating allows the charged powder to cling tenaciously to the fiber, even while heated with a hot air gun to above its melt temperature. A variant of the wet slurry coating process was also explored. The carbon fibers are first wetted with water. Then dry powder is sprinkled onto the wet tow and doctor-rolled between the fibers. The wet structure is then taken onto a heated roll, with hot air guns drying and sinter-melting the powder onto the fiber surfaces. In both cases SEM shows individual fibers coated with powder particles that have melted in place and flowed along the fiber surface via surface tension.
    Keywords: NONMETALLIC MATERIALS
    Type: Hampton Inst., NASA/American Society for Engineering Edu; Hampton Inst., NASA(
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Processing polymeric powders (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The concept of uniformly and continuously depositing and sinter-fusing nominal 0.1 to 40 microns dimensioned electrostatically charged polymer powder particles onto essentially uniformly spread 5 to 20 micron grounded continuous fiber tow to produce a respoolable thermoplastic composite two-preg was formulated at NASA Langley. The process was reduced to practice under a NASA grant at the University of Akron this spring. The production of tow-preg is called phase 1. The production of ultrafine polymer powders from 5 to 10 percent (wt) polymer solids in solvent is considered. This is phase 0 and is discussed. The production of unitape from multi tow-pregs was also considered. This is phase 2 and is also discussed. And another approach to phase 1, also proposed last summer, was scoped. This is phase 1A and is also discussed.
    Keywords: NONMETALLIC MATERIALS
    Type: Old Dominion Univ., NASA/American Society for Engineering Ed; Old Dominion Univ.,
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Electrostatic dry powder prepregging of carbon fiber (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Ultrafine, 5-10 micron polymer-matrix resin powders are directly applied to carbon fiber tows by passing then in an air or nitrogen stream through an electrostatic potential; the particles thus charged will strongly adhere to grounded carbon fibers, and can be subsequently fused to the fiber in a continuously-fed radiant oven. This electrostatic technique derived significant end-use mechanical property advantages from the obviation of solvents, binders, and other adulterants. Additional matrix resins used to produce prepregs to date have been PMR-15, Torlon 40000, and LaRC TPI.
    Keywords: COMPOSITE MATERIALS
    Type: International SAMPE Symposium and Exhibition; Apr 02, 1990 - Apr 05, 1990; Anaheim, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
    Electronic Resource
    Electronic Resource
    On thermal boundary layer growth on continuous moving belts (1967)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 13 (1967), S. 1210-1211 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690130634
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    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Parametric concepts in liquid rotational molding (1976)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 16 (1976), S. 680-686 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A description of the fluid mechanics and the energy transfer mechanisms present in a liquid rotational molding system is discussed. A simplified model assuming the liquid can be drawn off in a continuous layer over the mold surface was assumed. For the case of a negligible energy of reaction, a closed form analytical solution has been developed. The effects of mold composition and polymer thickness on the heating and cooling cycles have been analytically determined. The more complex problem, which includes the energy of reaction, has been solved for a representative case.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760161005
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  • 8
    Electronic Resource
    Electronic Resource
    Structural foam molding of incompatible thermoplastics (1977)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 17 (1977), S. 682-685 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Several mixtures eof reground low density polyethylene (LDPE) and gencral-purpose polystyrene (GPS) were, foam molded into structural foam plaques using a chemical blowing agent. Flexural strengths of test specimens cut from the plaques showed characteristic drop in value in the 50/50 mixture, but the modulus increases monotonically with GPS content. The data are consistent with those of Paul and co-workers on compression molded specimens. An added benefit was found with low concentrations of GPS in LDPE, where no appreeiable weight loss was observed after 2h in an aggressive solvent, benzene. This is attributed to the protection afforded the GPS by the continuous LDPE phase.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760170905
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  • 9
    Electronic Resource
    Electronic Resource
    Structural thermoplastic foam - A low energy processed material (1975)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 15 (1975), S. 747-756 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Shortages of both energy and materials make it imperative that low cost substances, processed with low energy requirements, be developed as soon as possible. One promising type of materials are the structural thermoplastic foams since they further enhance the favorable strength to weight ratio of plastics while reducing overall material needs. In addition, foam processing also capitalizes on the generally lower energy consumption and manpower-hour requirements for plastics. Finally, the possibility of forming larger and more complex shapes opens up new application areas. The largest deterrent to the use of structural foams is the lack of appropriate basic engineering and scientific knowledge. This paper not only summarizes and extends such understanding, but also shows how appropriate design procedures can be developed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760151007
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  • 10
    Electronic Resource
    Electronic Resource
    Thermoforming conditions in transparent/opaque coextruded sheet (1974)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 14 (1974), S. 810-816 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Processors have encountered processing problems in dealing with thermoforming co-extruded sheet where one layer is semitransparent to incident radiant energy of the heater banks and the other is opaque. An analysis of the radiant heating process shows that significant volumetric absorption of radiant energy takes place within the semitransparent sheet. From the model, it is shown that to minimize temperature excursions within laminated sheets (and thus reduce the tendency for delamination and blistering), heater banks should be programmed to cycle in an on-off mode with a rather short cycle period.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760141114
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