Labeling rules for packaging bags：JY-PCABCD
JY—registered trademark
PC—Product name
A—1 digit mark，9-General level
8-optical level
7-customization
B—2-digit mark, represents MFR, when it is lower than 10, add 0 before it。
C—Letter marks. Unlimited digits, representing additives, U represents adding UV, R represents adding
release agent, X represents adding flame retardant.
D—Letter mark. B stands for blue background, W stands for white background.
