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Application filed by Institutul De Fizica Si Tehnologia MaterialelorfiledCriticalInstitutul De Fizica Si Tehnologia Materialelor
Priority to RO109767ApriorityCriticalpatent/RO87273B1/en
Publication of RO87273B1publicationCriticalpatent/RO87273B1/en
Inventia se refera la un procedeu de obtinere a fibrelor poliacrilolonitrice termostabile caracterizat prin aceea ca fibrele proscursoare, printr-un proces continuu sau discontinuu, legate pe suport sau tensionate pentru preîntampinarea contractiei, sunt supuse unei oxidari superficiale la 180-220 degree C o durata de 30-90 min apoi uneu flexibilizari la teperatura camerei prin încovoiere sub un unghi de 180 degree de-a lungul întregii sale lungimi, pe o bara cilindrica neteda rigida cu diametrul de cel mult 10 mm si unei oxidari la temperaturi de 180-250 degree C pana la stare ignifuga.The invention relates to a process for obtaining thermostable polyacrylonitrile fibers characterized by the fact that the prospecting fibers, by a continuous or discontinuous process, connected to the support or tensioned to prevent the shrinkage, are subjected to superficial oxidation at 180-220 ° C 30-90 minutes, then flexing at room temperature by bending at an angle of 180 degrees along its entire length on a rigid smooth bar with a diameter of no more than 10 mm and an oxidation at temperatures of 180-250 degrees C to the flameproof state.
RO109767A1983-01-181983-01-18Process for producing heat-resistant polyurethane fibres
RO87273B1
(en)
COMPOSITE PRODUCT OF LONG FORM CONSTITUTED BY TWO OR MORE SYNTHETIC POLYMER COMPONENTS, CABLES AND CORDS INCLUDING THE PRODUCT, STRAP FORMED FROM THAT PRODUCT AND MANUFACTURING PROCESS