	US 11,867,600 B2
	Assessment method for injection molding property of plastic form
Hyunsup Lee, Daejeon (KR); Sung Hyun Park, Daejeon (KR); Soon Ho Sun, Daejeon (KR); Yi Young Choi, Daejeon (KR); Ki Soo Lee, Daejeon (KR); and Myung Han Lee, Daejeon (KR)
Assigned to LG Chem, Ltd.
Appl. No. 16/640,864
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Aug. 21, 2018, PCT No. PCT/KR2018/009609 § 371(c)(1), (2) Date Feb. 21, 2020, PCT Pub. No. WO2019/039839, PCT Pub. Date Feb. 28, 2019.
Claims priority of application No. 10-2017-0106308 (KR), filed on Aug. 22, 2017; and application No. 10-2017-0122819 (KR), filed on Sep. 22, 2017.
Prior Publication US 2021/0080367 A1, Mar. 18, 2021
Int. Cl. G01N 11/08 (2006.01); B29C 45/00 (2006.01); G01N 25/04 (2006.01); C08F 210/16 (2006.01); B29K 105/00 (2006.01)

CPC G01N 11/08 (2013.01) [B29C 45/0001 (2013.01); C08F 210/16 (2013.01); G01N 25/04 (2013.01); B29K 2023/06 (2013.01); B29K 2105/0094 (2013.01); B29K 2995/0063 (2013.01); B29K 2995/0088 (2013.01); C08F 2420/06 (2013.01)]

10 Claims

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(MI_2.16)^b*(STI)^c [Mathematical Equation 1]

in Mathematical Equation 1,

MI_2.16is 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.