Parameter Optimization of PET Plastic Preform Bottles in Injection Molding Process Using Grey-Based Taguchi Method

Table 1

Values of parameters’ levels.

Parameters	Levels
	1	2	3
Melting temperature in °C (A)	260	270	280
Mold temperature in °C (B)	60	70	80
Holding pressure in MPa (C)	120	132	144
Cooling time in s (D)	10	15	20