2. Before becoming a French colony, the name of copper coin as the main currency and monetary unit came into being. When Viet Nam was a French colony, the currency was the French Indian zhina dollar (issued by the French Agricultural Credit Bank with the words "piastre" and "Yuan" on its face). Vietnamese people call it "shield" (__ng, Chinese character: copper), and a few people call it "platinum" (b_c, Chinese character: platinum; The meaning of silver). After Vietnam's independence, North Vietnam and South Vietnam issued currencies independently, both of which were called "shields". Since the reunification of Vietnam, the name "shield" has still been used.

1, advantages

First, anti-counterfeiting security is strong.

The base material used in this set of plastic banknotes is not ordinary plastic, but a high-tech fiber-free polymer. Its texture is close to that of banknote paper, and it is antistatic and copy-proof. The plastic substrate itself is the first effective anti-counterfeiting measure. In addition, more than ten advanced anti-counterfeiting technologies, such as color-changing ink, invisible numbers, laser labels, gratings, perspective printing, concave-convex printing and so on, are used in plastic banknotes. , effectively put an end to the breeding and proliferation of counterfeit banknotes. Vietnamese dong, equivalent to RMB 260 yuan, is a large denomination banknote, which naturally arouses the covet of counterfeit banknote groups, but it is technically difficult to make. It is reported that more than 300 counterfeit Vietnamese dong (banknotes) were collected in Mangjie, Vietnam and dongxing city, China, but no counterfeit plastic banknotes were found.

Second, it is moisture-proof, corrosion-resistant and clean.

Because the base material of the plastic banknote is a polymer without fibers and pores, the coating on the outside of the plastic banknote makes the plastic banknote not absorb water, oil, dust and corrosion, which improves the cleanliness.

Third, it is durable.

Plastic banknotes are tear-resistant, wear-resistant and extremely tough. It is understood that the circulation life of plastic banknotes is five times that of the original banknotes. Compared with the price difference of materials, the short-term cost of operation and the long-term income, plastic is used to print banknotes instead of materials, which greatly reduces the product cost.

2. Deficiencies

First, it is difficult to make statistics when paying.

After using plastic banknotes for a period of time, they get sweaty and stick together easily. Compared with paper money, manual counting is more difficult, which leads to the occurrence of wrong payment from time to time, and the border residents have a great reaction.

Second, it is inconvenient to carry and keep.

For example, plastic banknotes put in your pocket are prone to irregular folding and shrinkage deformation when heated, so they are not as easy to carry as paper banknotes.

Third, once folded, it is difficult to smooth.

Compared with paper money in circulation, people are more reluctant to accept plastic paper money.