DUCK FABRIC FOR POLYMERIC COVERING Russian patent published in 2003 - IPC

FIELD: textile industry. SUBSTANCE: duck fabric comprises synthetic warp and weft threads made by rib weaving and base coverings fixed by means of cloth. Warp pattern repeat has even number of threads not less than 6 arranged at interval of 4 to define two face and reverse halves of pattern repeat having equal odd number of threads of at least 3. Within each half of pattern repeat, face warp threads are interlaced with weft threads in accordance with following mathematical dependence: 0,5 R_y/1+1/1(0,25 R_y-0,5), where R_y is weft pattern repeat. Long weft coverings overlap odd number of weft threads of at least 3, and respective warp threads of face and reverse halves of pattern repeat are interlaced out of phase one with respect to another to form in weft reverse mirror axis of symmetry with respect to longitudinal axis. Two groups of alternating warp threads formed in each half of pattern repeat are interlaced with one another in similar manner and offset with respect to one another along warp by number of threads equal to half the weft pattern repeat, with number of warp threads interlacing with one another in similar manner in each group of pattern repeat is equal to: (0.25 Ro+0.5) and (0.25 Ro-0.5), where Ro is warp pattern repeat. Fabric has improved rupture strength. EFFECT: increased efficiency and improved quality of fabric and, accordingly, polymeric covering. 2 cl, 9 dwg, 2 tbl