Page 57 - 《橡塑技术与装备》英文版2026年3期

THEORY AND RESEARCH

h s—Specific enthalpy of steam at a certain temperature
and pressure, KJ/Kg (see table 2).
Table 2 Comparison table of external temperature steam
pressure/temperature/density/specific enthalpy
Pressure Saturation Steam density (in Steam specific enthalpy
absolute bar temperature/℃ kg/m³) (Hg)(kj.kg )
-1
9.6 178.15 4.948 2 776.18
9.7 178.60 4.997 2 776.58
9.8 179.04 5.046 2 776.98
9.9 179.48 5.095 2 777.36
10 179.92 5.144 2 777.75
10.1 180.35 5.194 2 778.12

According to the table, at a vulcanization external
Figure 3 Sectional view of the mold sleeve
temperature of 180 ℃, we find that:
3
Table 1 Parameters of 51-inch curing press hot plate Steam density: 5.194 Kg/m ;
mold capsule Steam mass on the hot plate: m hot =ρv=5.194×0.023= 0.12
name geometric tolerance numerical value unit Remarks kg;
Diameter d 1.3 m
Height h 0.04 m Steam conditioning of the mold sleeve: m mold =ρv=
hot plate
Area s 0.58 m 2 5.194×0.054=0.28 kg;
0.023 m 3
volume v 1
1.2 m Steam specific enthalpy: 2,778.12 kj/kg;
diameter d max
0.047 m
Mold sleeve height h max 2 The heat quantity of the hot plate Φ heat =qhs=
area S max 0.12 m
volume 0.054 m 3 0.12×2778.12 = 334.51 kJ;
diameter 0.9 m 2
capsule height 0.36 m The heat quantity of the mold sleeve Φ mold =qhs=0.28
0.23 m 3
volume v 3 ×2778.12=778.60 kJ.

Each unit of curing press has 2 hot plates,
Steam is continuously introduced into the interior of The external temperature of vulcanization Φ 1 is equal
the hot plate and the interior of the mold sleeve → the mass
to Φ heat multiplied by 2 plus Φ mold , which equals 334.51×2+
flow rate is equal to the mass of steam in the hot plate or mold
778.60 = 1 447.62 kJ.
sleeve during any given time period.
2.1.2 Related calculations on internal
Steam heat calculation formula Φ=qh s temperature consumption
q—Steam mass in the cavity, Kg

Table 3 Comparison table of internal temperature steam pressure/temperature/density/specific enthalpy
3 .
.
-1
Absolute pressure / MPa Temperature t/℃ Density ρ Specific volume v /(m kg ) Specific enthalpy h /(kj kg )
＂
-1
＂
1.90 209.797 9.556 0.104 650 2 796.10
2.00 212.375 10.047 0.099 536 2 797.20
2.10 214.855 10.539 0.094 890 2 798.20
Based on the internal vulcanization temperature of 210℃ Calculation of internal temperature of sulfurized steam:
(if there is a temperature drop after the process temperature Φ 2 =qh s =ρvh s =2.2×27 96.1=6151.42 kJ;
inside the capsule, condensate will be discharged + steam will The total heat provided by the external and
be supplied for temperature rise, meaning that there is always internal temperatures during vulcanization is
210℃ steam inside the capsule), the table shows: Φ=Φ 1 +Φ 2 =1,447.62+6,151.42=7,599 kJ.
Density: 9.556 kg/m 3 Theoretical calculation of heat demand for tire
Mass of warm steam inside the capsule: m capsule =ρv= vulcanization:
9.556×0.23 = 2.2 kg; Q x =c . M . δ t
Specific enthalpy: 2 796.1 kJ/kg Q X -Heat, J;

Vol.52，2026 ·11·