FABRIC FOR PAPERMAKING, IN PARTICULAR FOR USE IN FORMING PART OF PAPERMAKING MACHINE Russian patent published in 2014 - IPC D21F1/00 

FIELD: textiles, paper.

SUBSTANCE: fabric with the four-thread structure for the papermaking machine, in particular the forming fabric for use in the forming part of the papermaking machine, having at least one repeating element of the fabric. The fabric comprises a group of warp longitudinal MD upper threads, a group of weft transverse CMD upper threads interwoven with the upper MD threads to form the upper layer of the fabric, a group of central MD threads; a group of central CMD threads interwoven with the central MD threads to form a central layer of fabric; as well as a group of lower MD threads and a group of lower CMD threads interwoven with the lower MD threads to form a lower layer of the fabric. At that in the repetitive element of the fabric the upper layer is bonded only with the central layer, the lower layer is bonded only with the central layer by means of the relevant independent binding patterns, where the first binding pattern is formed of the group of pairs of binding threads, each pair of which is located between two adjacent upper CMD threads and comprises at least one thread interwoven with both upper MD threads and the central MD threads. The binding threads of each pair are twisted relative to each other and superimposed one on another in the vertical direction and located between two adjacent upper CMD threads. The second binding pattern is formed of at least several central CMD threads interwoven with the central MD threads, and also with the lower MD threads, but not with the upper MD threads, thereby determining the relevant crosslinking threads that bind the central layer and the lower layer. At that the fabric is formed of three superimposed warp threads determining the array of the warp threads, repeating in the transverse CMD direction, and of five weft threads determining the array of weft threads repeating in the longitudinal MD direction, where the ratio between the weft threads and the warp threads repeats in the longitudinal direction and the transverse direction, respectively, and therefore constitutes 5:3.

EFFECT: proposed fabric for papermaking machine has good drainage capacity and is resistant and stable over time.

14 cl, 7 dwg