US 11,913,923 B2
Method for evaluating properties of melt-blown plastic resin
Hyunsup Lee, Daejeon (KR); Seok Hwan Kim, Daejeon (KR); Heekwang Park, Daejeon (KR); Ki Soo Lee, Daejeon (KR); Sangjin Jeon, Daejeon (KR); and Myunghan Lee, Daejeon (KR)
Assigned to LG Chem, Ltd., (KR)
Filed by LG Chem, Ltd., Seoul (KR)
Filed on Mar. 28, 2023, as Appl. No. 18/127,457.
Application 18/127,457 is a continuation of application No. 16/645,298, abandoned, previously published as PCT/KR2018/010633, filed on Sep. 11, 2018.
Claims priority of application No. 10-2017-0118860 (KR), filed on Sep. 15, 2017.
Prior Publication US 2023/0236160 A1, Jul. 27, 2023
Int. Cl. G01N 30/88 (2006.01); G01N 33/44 (2006.01); G01N 30/02 (2006.01)
CPC G01N 30/88 (2013.01) [G01N 33/442 (2013.01); G01N 2030/027 (2013.01)] 9 Claims
 
1. A method for producing a nonwoven fabric, comprising:
preparing a plastic resin in a dried pellet form,
measuring a molecular weight distribution of the prepared plastic resin;
deriving a peak molecular weight value from the molecular weight distribution of the prepared plastic resin;
deriving a molecular weight distribution value (Mw/Mn) from the molecular weight distribution of the prepared plastic resin; and
calculating a predicted stretching diameter of a nonwoven fabric produced by the prepared plastic resin through a melt-blown process by using Mathematical Formulas 1-2,
Polymer Characteristic Factor=a(MWD)b*(Mp)c  [Mathematical Formula 1]
in Mathematical Formula 1,
MWD is the molecular weight distribution value (Mw/Mn) of the prepared plastic resin,
Mp is the peak molecular weight value of the prepared plastic resin,
a is 0.01 to 0.02,
b is 0.8 to 1.0, and
c is 0.20 to 0.22,
Predicted Stretching Diameter=d*(Polymer Characteristic Factor)−e  [Mathematical Formula 2]
in Mathematical Formula 2,
d is 1.01 to 1.02, and
e is 0.005 to 0.007, and
producing a nonwoven fabric by melt-blowing the prepared plastic resin which has the predicted stretching diameter of about 0.35 mm or less.