Patent ID: 11867600
Assignee: LG CHEM, LTD.
Field: Measurement (Instruments)
Classification: CPC C  G  B  Y | IPC B  C  G

Claim 0:
1. A method for evaluating injection physical properties of a plastic resin comprising the steps of:
measuring a melt index (MI) value of a specimen of the plastic resin;
measuring a steady flow viscosity value of the specimen of the plastic resin; and
deriving a shear thinning index value from the steady flow viscosity value according to a viscosity model equation; and
predicting injection pressure using the melt index value and the shear thinning index value according to Mathematical Equation 1,

predicted injection pressure=a(MI2.16)b*(STI)c   [Mathematical Equation 1]

in Mathematical Equation 1,
MI2.16 is a melt index value as measured by according to ASTM D1238 Condition E,
STI is a shear thinning index value derived according to the viscosity model equation,
a has a value of 2200 to 2500,
b has a value of −0.1 to −0.5, and
c has a value of from 0.1 to 0.5.