of the ANOVA model are presented inTable 4. The values of the F-statistic indicate that each of the four factors has a significant
effect on the adhesion force of the system. The cord type factor
has the highest significant effect on the adhesion force and the
pull-out force values associated with cord 2 are higher than that
of cord 1. The promoter type and concentration have also
considerably significant effects on the pull-out of the system
followed by the aging time intervals. Comparing the total average
values before and after aging,Tables 3 and 4, it is clear that aging
has a positive impact on adhesion. Regarding promoter types, the
results show that the pull-out force of KMR affords better
adhesion than that of manobond. Considering the promoter
concentration factor the results inTable 4show that level three
of concentration 1.0 phr possesses the best adhesion properties.
The table also indicates that aging enhances adhesion when
carried out for 4, 7, or 10 days depending on the promoter type
and concentration and the cord type. So, in order to achieve the
optimum adhesion force under aging conditions, it is recom-mended to age NR mixes that contain 1.0 phr concentration of
KMR promoter and cord type 2 for 7 days. The value of the square
of the correlation coefficient,R
2
equals 0.878. Thus the statistical
analysis results are in consistent with the results obtained in case
of aging condition
of the ANOVA model are presented inTable 4. The values of the F-statistic indicate that each of the four factors has a significant
effect on the adhesion force of the system. The cord type factor
has the highest significant effect on the adhesion force and the
pull-out force values associated with cord 2 are higher than that
of cord 1. The promoter type and concentration have also
considerably significant effects on the pull-out of the system
followed by the aging time intervals. Comparing the total average
values before and after aging,Tables 3 and 4, it is clear that aging
has a positive impact on adhesion. Regarding promoter types, the
results show that the pull-out force of KMR affords better
adhesion than that of manobond. Considering the promoter
concentration factor the results inTable 4show that level three
of concentration 1.0 phr possesses the best adhesion properties.
The table also indicates that aging enhances adhesion when
carried out for 4, 7, or 10 days depending on the promoter type
and concentration and the cord type. So, in order to achieve the
optimum adhesion force under aging conditions, it is recom-mended to age NR mixes that contain 1.0 phr concentration of
KMR promoter and cord type 2 for 7 days. The value of the square
of the correlation coefficient,R
2
equals 0.878. Thus the statistical
analysis results are in consistent with the results obtained in case
of aging condition
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