Study on External Gas-Assisted Mold Temperature Control for Improving the Melt Flow Length of Thin Rib Products in the Injection Molding Process

Table 1

Simulation parameters for studying melt flow length.

Simulation parameters
Air inlet temperature of air drier	30°C, 7 bar
Air outlet temperature of air drier (°C)	30	200	250	300	350	400
Air density (kg/m^3) [18]	1.165	0.746	0.680	0.616	0.570	0.524
Heat capacity of air (J/kgK) [18]	1004	1026	1035	1046	1057	1068
Thermal-expansion coefficient of air (x10^−3K^−1) [18]	3.32	2.1	1.93	1.76	1.64	1.52
Air pressure	1 atm
Initial temperature of mold insert	30°C
Aluminum density - ASTM B209-14	2702 kg/m^3
Heat capacity of aluminum - ASTM B209-14	903 J/kgK
Thermal conductivity of aluminum - ASTM B209-14	237 W/mK
P20 steel density - ASTM A681	7870 kg/m^3
Heat capacity of P20 steel - ASTM A681	460 J/kgK
Thermal conductivity of P20 steel - ASTM A681	29 W/mK
Simulation type	Transient
Heating time	0 s 30 s
Air outlet to environment	(i) Environment pressure: 1 atm
	(ii) Air temperature: 30°C
Initial air volume	(i) Air velocity: 0 m/s
	(ii) Air pressure: 1 atm
	(iii) Air temperature: 30°C