Polarizing film cutting knife and method of manufacturing polarizing plate using the same

A method of manufacturing a polarizing plate comprising:

• unrolling a polarizing film from a polarizing film roll in a preparing process;
• forming polarizing plates by cutting the polarizing film using a polarizing film cutting knife in a cutting process;
• sorting out defective goods among the polarizing plates in a testing process;
• and
• stacking the polarizing plates which pass the testing process to form a bunch of the polarizing plates in a packaging process which comprises a grinding process, wherein in the grinding process:
• cutting planes of the bunch of the polarizing plates are grinded to planarize the cutting planes, and
• only cutting planes which are in parallel with a polarizer direction of the polarizing film are grinded, wherein the polarizer direction is in parallel with a length direction of the polarizing film;
• wherein the polarizing film cutting knife comprises a body portion extending in a first direction, and a knife portion connected to the body portion and comprising a first surface and a second surface, the first and second surface forms a first angle, and
• the first angle is about 21.8 to 22.2 degrees.