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The article analyses the role of friction between the warp and weft threads in the canvas. A mathematical model of the influence of friction forces on the elongation of the main thread and the mutual displacement of the warp and weft threads in plain weave is proposed. The features of the dynamics of the propagation of deformation along the warp threads as a result of the influence of friction forces are established. It is shown that at low friction forces between the warp and weft threads, the system behaves as a two-point quasilinear oscillator, the movement of which is a beat with oscillations at the fundamental and combined frequencies. With an increase in the friction forces, the randomness of motion in the places where the filaments overlap increases and with a further increase in their vibrations, the vibrations disappear, the fabric structure behaves as a whole. The calculation of the warp thread deformation taking into account the friction forces against the weft thread showed that the friction forces significantly affect the displacements of the thread sections when it is elongated, and the effect of chaotisation of the shift of the thread sections, which is certainly transmitted back to the weft threads, arises.

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