Accession Number : ADA309415

Title :   PBI Tow Manufacturing Methods.

Descriptive Note : Technical rept.,

Corporate Author : CELANESE RESEARCH CO SUMMIT NJ

Personal Author(s) : Price, Arthur E.

PDF Url : ADA309415

Report Date : AUG 1971

Pagination or Media Count : 152

Abstract : The purpose of this project was to (a) scale-up the single stage polymerization process (b) increase spinning productivity (c) establish a tow process for processing large bundles of yarn in a continuous manner (d) produce 500 lbs of quality product, and (e) revise the projected economics of a 1 MM lb/yr production plant. The scale-up of the single-stage PBI polymerization process in a specially designed 50-gallon reactor was successful with the attainment of polymer I. V.'s in the 0.7 to 0.9 range at the target capacity level. Insufficient time was available, however, to fully optimize the process conditions. Spinning productivity was nearly doubled by establishing the ability to spin 200-hole jets. This was the maximum number of holes attainable in a single ring with the available pilot equipment; however, 300 or more hole could be employed in a commercial application. The potential for additional spinning productivity was demonstrated by spinning and drawing higher filament deniers to give target properties. New jet starting techniques were demonstrated. Large 5.5 lb packages were produced with both columns being run simultaneously. Continuous washing, drying, and drawing in tandem was demonstrated with PBI tows of 1000 to 5000 filaments. Target properties were achieved and a total of 500 lbs of tow was produced. A revised preliminary plant design was prepared for a 1 MM lb/yr PBI plant producing 0.8 MM lb/yr of staple and 0.2 MM lb/yr of filament yarn. The production cost, assuming $5.00/lb for DAB and $l.00/lb for DPIP, was $7.56/lb overall. The biggest factor is obviously the purchase price of DAB which accounts at this price level for two-thirds of the production cost.

Descriptors :   *SPINNING(INDUSTRIAL PROCESSES), *YARNS, *WINDING, *DRAWING(FORMING), POLYMERS, POLYMERIZATION, HEAT EXCHANGERS, COOLING, COSTS, HOLES(OPENINGS), FILAMENTS, PRODUCTIVITY, DOPING, DRYING, BUNDLES, WASHERS(CLEANERS).

Subject Categories : Textiles
      Mfg & Industrial Eng & Control of Product Sys

Distribution Statement : APPROVED FOR PUBLIC RELEASE