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

Table 2

Shrinkage values for PET preform.

Runs	Parameters/levels				Shrinkage
	A (°C)	B (°C)	C (MPa)	D (s)	Diameter (%)	Length (%)
1	260	60	120	10	2.405	2.587
2	260	70	132	15	2.364	2.531
3	260	80	144	20	2.482	2.601
4	270	60	132	20	2.931	2.949
5	270	70	144	10	2.884	2.879
6	270	80	120	15	2.596	2.636
7	280	60	144	15	2.714	2.671
8	280	70	120	20	2.575	2.636
9	280	80	132	10	2.843	2.740