With their properties, upholstery covering materials significantly influence the quality of upholstered products. These materials form the surface layer of upholstered furniture; any damage to this material is immediately visible to the user. We consider the stitches connecting the covering fabrics to be one of the critical points of the upholstered surface, therefore they must have the required strength. Faux leather is one of the most used upholstery materials. The main aim of the paper is to determine the effect of upholstery faux leather, stitch length, point needle, and needle size on the strength of the stitches and the seam efficiency. The results of the experiment proved the suitability of using a sewing needle LR for joining covering materials such as faux leathers. The highest force to seam a rupture in the joints was achieved in the direction of the warp yarns of the underlying layer of PU (Polyurethane) faux leather with a stitch length of 4 mm and needle type LR/90. The highest seam efficiency was achieved with seams in the direction of the weft yarns of the PVC (Polyvinyl chloride) faux leather underlying layer with a stitch length of 4 mm and needle type LR/90. If the underlying layer of faux leather is a fabric with canvas binding, a higher seam efficiency of joints is assumed.

Strength of stitched joints of the coating upholstery fabrics. The aim of this work is to explore the impact of selected factors on change of the strength and stiffness characteristics of sewn joints of upholstery fabrics. For experimental detection of said characteristic the methodology was used EN ISO 13935-1. Changes in seam joints was evaluated on the basis the impact of input parameters joints. Results of experimental measurements is possible observed the greatest impact stitch length. It is also possible to note from the results of the experiments the significant influence of the sewing thread construction on the strength of the stitched joint