COMPOSITE THERMOPLASTIC/GLASS FILAMENT REINFORCEMENT FOR BUOYANT SUBMARINE CABLES RG-372 (XN-1)/U AND RG-373 (XN-1)/U.
Interim rept. no. 4, 10 Nov 66-10 Feb 67,
UNION CARBIDE CORP BOUND BROOK N J RESEARCH AND DEVELOPMENT DEPT
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Tentative specifications for the impregnated glass filament include a use temperature range from minus 28C to plus 65C. Preliminary tests indicate that this requirement should pose no problem for S glass roving impregnated with Estane 5701 polyurethane. As indicated by a decrease in tensile strength, there appears to be an optimum number of ends in a strand of glass which can be effectively impregnated. Tensile testing of 40-end roving was made possible by encompassing the ends of the roving in a tab made of 23 polyurethane and 13 Phenoxy. This prevents the tab from yielding but does not cause stress concentration points. The cross-sectional shape of 20-end roving can be made circular by the use of godet rolls which contain grooves with semi-circular cross-sections equivalent in diameter to that of the impregnated roving. However, the godet grooves alone are not enough to reshape the flattening to which 40-end roving is subjected during drying. Grooves on the turn-around idlers should overcome this so that both the 40 and 20-end roving can be produced with circular cross-sections. Author
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