Page 88 - 《橡塑技术与装备》英文版2026年2期

HINA R&P TECHNOLOGY AND EQUIPMENT

account the process requirement for 10 to 15 thin-pass cycles breaking force is illustrated in figure 4 below:
for FX-4, the impact of thin-pass cycles on appearance quality,
and the trend of changes in the Shore hardness value of the
rubber compound, the optimal number of thin-pass cycles is
determined to be 13 cycles.

Figure 3 Trend chart of qualified rate of effective
bonding under different test schemes

As can be seen from Figure 4, the tensile breaking force
of the Ф10 mm test group is the highest when the overlap
Figure 2 The influence of the number of thin-pass length is 7 mm; the tensile breaking force of the Ф20 mm
cycles on the Shore hardness of rubber compound
test group shows no significant change for different overlap
lengths; the tensile breaking force of the Ф40 mm test group
Through the testing and verification of the softening
is the highest when the overlap length is 5 mm, and slightly
process and the thinning process, the optimal parameters
decreases when it reaches 7 mm; the tensile breaking force
are determined as follows: set the roller distance to 1.7mm,
of the Ф60 mm test group shows an overall upward trend for
allowing the rubber compound to pass through 5 times; lock
different overlap lengths, with the highest tensile breaking
the roller distance to 0.4mm, and thin it 13 times.
force at 7 mm. When the overlap length is 3 mm and 5 mm,
2.3 Blank ring forming
To analyze the impact of lap length on bonding the breaking position is in the overlap area, while when the
overlap length is 7 mm, the breaking position is in the non-
effectiveness, experiments were conducted using coils with
inner diameters of 10 mm, 20 mm, 40 mm, and 60 mm. overlap area. This is because when the overlap length is 7 mm,
the strength of the overlap area is higher than that of the blank
Ethyl acetate was used to assist in the bonding process, and
strip itself, resulting in the phenomenon where the blank strip
lap lengths of 3 mm, 5 mm, and 7 mm were selected. The
is stretched and thinned until it breaks.
combinations of coil inner diameter and lap length were
arranged and tested. Each experimental scheme involved Therefore, considering the qualified rate of effective
bonding and the lap strength after forming a loop, the optimal
bonding 10 samples to reduce the impact of abnormal
lap length is determined to be 5 mm.
fluctuations. The effective bonding pass rate and tensile strength
indicators were used to reflect the bonding effectiveness. The
effective bonding pass rate for each experimental scheme was 3 Conclusion
Through experimental verification, the optimal
calculated, as shown in figure 3 below:
parameters for the preparation stage of the blank for producing
As can be seen from Figure 3, after looping, the effective
FX-4 rubber sealing rings are as follows: set the roller gap to 1.7
bonding pass rates of the test groups with lap lengths of 3
mm for Ф10 mm, Ф20 mm, Ф40 mm, and Ф60 mm are 90%, mm, soften the rubber compound 5 times; lock the roller gap
to 0.4 mm, and pass it through 13 times; use ethyl acetate to
100%, 100%, and 100%, respectively. When the lap length is 5
overlap the blank ring, with an overlap length of 5 mm.
mm and 7 mm, the effective bonding pass rates are both 100%.
The relationship between the lap length and the tensile

·44· Vol.52，No.2