2002 - Volume 1 - JEFF. Journal of Engineered Fibers and Fabrics

mixture after soaking during 360s depends upon quantity of
SAP, but this dependence is not proportional; for instance, the
increase of the quantity of SAP from 5 till 50%, i.e. at 10
times, is accompanied by the growth of AC only at 50%, i.e.
0.5 time. This fact proves the unsuitability of using this mixture
with content of SAP more than 30% because it is not
expedient.
The second cause of the application of the restricted quantity
of SAP is ability of the swelled particles of SAP to
migrate in the wet core under pressure and by change of the
adult’s posture.
The reduction of AC of the mixture of wood pulp and SAP
can be explained by the result of the comparison of the
accounted and experimental values AC and ACrm for the
double mixtures (Table 4) by soaking during 360s. The correlation
coefficient between these two groups of the values is
very high (r = 0.98 and 0.94), this fact points out the absence
of interaction between SAP and cellulosic fibers, that may be
14 INJ Spring 2002 2
the cause of the obviation of mechanical hindrance to the
swelling of SAP. At the initial period of time (60s) the coefficient
correlation between the accounted and experimental
values is low, what is stipulated by the difference in the rate
of swelling of cellulosic fiber and superabsorbent due to their
properties.
In order to determine the role of the synthetic fibers in the
absorption of liquid by superabsorbent in their mixtures was
determined AC and ACrm in the range of ratio: 70/30; 50/50;
30/70. The data are presented in Table 5. The values of AC
show that the initial absorption of saline (time 15s) grows as
a consequence of the use of the synthetic fibers in the mixture
with SAP. It may be supposed that SF reduce contacts
between the swelling particles of SAP and obviate the hindrance
to flowing liquid to the outer surface of the SAP particles.
The influence of SF on the absorption capacity of SAP
at the long period of time is analogous to the influence of the
cellulosic fibers: the increase of AC is not proportional to the
Table 4
ABSORPTIVE PROPERTIES OF THE MIXTURE WOOD PULP AND SAP
Content, % Absorbtion Capacity, AC, g/g Retention, AC rm, g/g
Pulp SAP time, s
60 360 360
Exp* Acc** Exp. Acc. Exp. Acc.
100 - 18.0 - 18.3 - 12.4 -
95 5 20.4 19.1 - - 13.1 -
90 10 19.6 20.2 20.2 20.2 13.9 14.2
85 15 21.7 21.3 22.3 21.3 16.2 15.0
80 20 21.4 18.4 23.6 22.4 16.4 15.9
75 25 21.2 23.6 24.7 23.5 17.8 16.8
70 30 23.1 24.7 25.7 24.6 17.1 17.7
60 40 28.0 27.2 29.1 26.8 20.7 19.4
50 50 19.8 29.0 29.5 29.0 20.8 21.1
- 100 - - 40.3 - 30.4 -
Coefficient correlation (r) 0.40 0.98 0.94
*Exp-experimental **Acc-accounted
Table 5
INFLUENCE OF SF ON THE ABSORPTION CAPACITY OF THEIR MIXTURE WITH SAP
Content, % Absorbtion Capacity AC, g/g Retention, AC rm, g/g
SAP PPES time, s
360 360
Exp. Acc. Exp. Acc.
100 - - 40.1 - 30.3 -
70 30 - 29.3 31.0 24.9 24.1
50 50 - 26.8 25.0 21.7 20.4
30 70 - 22.0 19.1 16.1 16.3
70 - 30 31.2 35.0 28.8 26.5
50 - 50 26.5 32.5 25.7 24.4
30 - 70 23.8 29.5 26.0 21.8
Coefficient correlation (r) 0.83 0.70
*Exp-experimental **Acc-accounted