Table 1
Technological indicators of two-layer knitted fabrics of a new structure.
Indicators
Options
I
II
III
IV
V
VI
Thread type and linear density,
tex
Front layer
PAN 30 tex
х 2, 100%
Back layerort
Ring step A, mm
Front layer
1,66
1,78
2,2
1,92
1,66
1,56/1,47
Back layerort
1,66
2,0
3,1
3,8
1,43
1,43
The height of the ring row is V,
mm
Front layer
1,25
1,0
1,1
1,35
0,9
1,13/2,9
Back layerort
1,25
1,78
2,2
1,92
1,0
1,1
The density of rings in
horizontal, Rg, Ring
Front layer
30
28
23
26
30
32/34
Back layerort
30
25
16
13
35
35
The density of rings in the
vertical Rv, Ring
Front layer
40
50
46
37
55
44/17
Back layerort
40
28
23
26
50
46
The length of the ring thread is
L, mm
Front layer
4,7
5,0
5,0
5,8
6,6
6,5/5,3
Back layerort
6,25
7,2
7,1
6,8
6,8
6,3
Surface density of knitted fabric Ms, g/m
2
367,2
309,7
308,4
240,3
373,1
447,5
The thickness T, mm
1,7
1,45
1,4
1,15
1,97
2,1
Volumetric density of knitted fabric d, mg/cm
3
216
213,6
220,3
209
189,4
213,1
Absolute volumetric density
Δδ, mg/sm
3
-
2,4
-4,3
7
26,6
2,9
Relative lightness
θ, %
-
1,11
-1,9
3,2
12,3
1,3
Proceedings of International Educators Conference
Hosted online from Rome, Italy.
Date: 25
th
Nov., 2023
ISSN: 2835-396X Website: econferenceseries.com
30
Raw material consumption is an indicator of consumption of the mass of textile yarn
per unit of product or one square meter of knitted fabric. The consumption of raw
materials for knitted fabric is characterized by the "surface density" MS indicator,
and its unit of measurement is g/m
2
.
According to the theory of knitting [7], the surface density of two-layer knitted
fabrics is determined by the following formula: tamara
М
S
=2·10
-4
·P
g
·
P
v
·
l·T
um
(1)
where: P
G
and P
V
are the number (density) of horizontal and vertical rings located in
100 mm in the tissue; l - the length of the ring thread, mm; Tum - total (total) linear
density of threads, tex.
It can be seen from the formula that the variation of the raw material consumption
of the knitted fabric depends on the horizontal and vertical density, the length of the
loop thread and the linear density of the threads.
The effect of surface and thickness changes of two-layer knitted fabric samples on
the texture and volume density index of the new structure was studied. According to
him, the surface density of the base fabric of the first option was MS=367.2 g/m
2
,
and when the thickness was equal to T=1.7 mm, the volume density index of the
sample was 216 mg/cm
3
(Table 1). Also, the highest surface density indicator was
observed in option VI and was 447.5 g/m
2
, and the lowest surface density indicator
was 240.3 g/m
2
in option IV. According to the thickness index, the smallest index
was 1.15 mm observed in the IV option, and the largest index was 1.97 mm observed
in the V option. However, among the knitted samples, variant V was noted as the
sample with the least consumption of raw materials, and its volume density was
189.4 mg/cm
3
. In terms of raw material consumption, the greatest value was
observed in option III, and accordingly, its volume density was 220.3 mg/cm
3
.
So, the best result in terms of consumption of raw materials compared to the base
fabric was observed in option V at the value of 189.4 mg/cm
3
, its absolute volumetric
lightness index was 26.6 mg/cm
3
, and the relative lightness index was 12.3%. As a
result, this variant representssurface density of knitted fabric, g/m2a reduction of
26.6 mg/cm
3
, i.e. 12.3%, compared to the base tissue. Also, the worst indicator of
consumption of raw materials compared to the base fabric was recorded in option
III, 220.3 mg/cm3, its absolute volumetric lightness indicator was -4.3 mg/cm
3
, and
the relative lightness indicator was -1.9%. , this variant indicates a weight gain of
4.3 mg/cm
3
, i.e. 1.9%, relative to the base tissue (Fig. 3).
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