THE RESISTANCE TO CUTTING OF KNITTED MATERIAL MADE OF HIGH-STRENGTH YARNS WITH THE USE OF FLAT KNITTING EQUIPMENT WITH AND WITHOUT SINKERS

Abstract

Purpose. To investigate the effect of changing the type of flat knitting equipment (with and without
sinkers) and knitting density on the resistance to cutting of knitted fabrics with a coolie weave made
from high-molecular-weight polyethylene and para-aramid yarns.

Methodology. In accordance with the methodology of the European standard EN 388-2019, the level
of resistance of the developed knitted material samples to cutting with a circular knife was determined
by a specialized Muver Mod.5111 sizing machine. The Microsoft Excel was used to visualize and analyze
the experimental data obtained.
Results. The level of the cut resistance (index) of knitted materials made from high-strength raw
materials with the use of two types of flat-knitting equipment at five levels of knitting density was
determined. In the course of the research, it was found that in the case of a diagonal direction of cutting
of a knitted material sample, the knitting density does not have a significant effect on the level of
resistance to cutting. The value of the cut resistance index is influenced by the type of high-strength
yarns and the type of flat-knitting equipment. The knitting density is a significant factor affecting the
level of resistance to cutting when the rotary knife is moved across the flat surface of the knitted fabric
in the direction of the loop rows or columns.
Scientific novelty. The influence of the type of flat-knitting equipment (with and without sinkers)
and knitting density on the cut resistance (index) of a knitted fabric of the surface interweaving made
of high-molecular-weight polyethylene and para-aramid yarns for three directions of a rotary knife
movement on the flat surface of the knitted fabric: in accordance with the standardized methodology
at an angle of 45° to the loop line, along the loop line and loop column.
Practical value. The dependences obtained in the course of experimental studies provide an opportunity
to determine the level of resistance of knitted fabrics to cutting with a circular knife in accordance
with the selected type of a knitting equipment, knitting density and the type of high-strength yarns.