Die of Gold Banknote
Die of Gold Banknote
Compared with gold bars and coins, gold banknotes are more difficult to make. There are two difficulties. The first is the production of the gold banknote die, and the second is to press out a thin enough gold sheet. Today we will focus on the production of the gold banknote die.
1: Pattern
There are two types of gold banknote patterns, one is a single-sided pattern and the other is a double-sided pattern. Most factories on the market make gold banknotes with single-sided patterns, which shows the complexity of double-sided patterns. The reason is that the weight of the gold banknote cannot be accurately controlled, and the scrap rate of products with double-sided patterns is relatively high. Taking a 1-gram gold banknote with a single-sided pattern as an example, a skilled worker can only successfully make 500 pieces of a 1KG gold bar, and an ordinary worker can only successfully make 200-300 pieces. Therefore, we recommend that if you are a novice, try to choose a single-sided pattern, and when you are experienced enough, choose to make a gold banknote with a double-sided pattern.
2: Type of die：Lasering die or Sparking die
(1) Definition of Lasering die or Sparking die:
Laser die is to use laser to print the pattern on the die, and the depth of the pattern is very shallow; Sparking die is to use CNC to carve the pattern on the steel film, and then use manual polishing, the depth of the pattern can be deepened;
(2) Selection of Lasering die or Sparking die:
When to choose Lasering die or and when to choose Sparking die?
- Cost and efficiency
Lasering die
Cost: High equipment investment, but low processing cost per piece (no electrode loss).
Efficiency: Fast processing speed, suitable for small batches or rapid iterations.
Sparking die
Cost: The cost of electrode production is high (especially complex electrodes), but it is suitable for long-term mass production.
Efficiency: The processing speed is slow, but the die life is long (better wear resistance).
Selection suggestion:
Short-term small batch or sample needs → Laser processing (saving time and electrode costs).
Long-term mass production →Sparking (die are more durable).
After a period of use, laser dies need to be smoothed and the pattern engraved again (about 1,000 times of use), which means that if customers choose lasering dies, they need to send the dies back to the manufacturer regularly. Sparking die can be used for a longer time, about 1-2 years, and the overall cost is lower.
Secondly, the choice of these two dies is related to the thickness of the banknote: if the thickness is greater than 0.1mm, you can choose the sparking die, and if the thickness is less than 0.1mm, you must use the lasering die. The third point is related to the pattern of the die. If the pattern is simple, you can give priority to the sparking die. If the pattern is complex, you must give priority to the lasering die.
Design complexity and precision
Lasering die
Advantages:
Suitable for complex two-dimensional patterns (such as fine lines, micro-holes, text), fast processing speed (minutes).
Limitations:
Limited accuracy and surface quality for deep grooves and complex three-dimensional structures (such as three-dimensional relief).
The side wall may produce taper due to beam divergence.
Sparking die
Advantages:
It can process complex three-dimensional structures (such as deep grooves and special-shaped cavities) with an accuracy of ±0.005 mm.
High surface quality (Ra 0.1–0.4 μm), no secondary polishing required.
Limitations:
Electrodes need to be made, and the initial preparation time is long; the processing speed is slow (hours).
Selection suggestion:
If the banknote is designed with high relief, deep grooves or three-dimensional structure → Choose lasering processing.
If the design is a flat fine pattern or batch rapid production → Sparking processing is preferred
- 45mm*90mm→5g→THK:0.08mm
- 45mm*90mm→5g→THK:0.08mm
- 45mm*90mm→5g→THK:0.08mm
Surface quality and post-processing
Laser die:
The surface may have residual oxide layer or ablation marks, which need to be polished later.
Suitable for scenes where the surface finish is not demanding.
Sparking die:
The surface is uniformly discharged with pits, which can directly achieve a mirror effect (through fine processing).
It is more suitable for precious metal dies with high finish requirements (such as gold banknotes).
Selection suggestion：
For mirror-like surfaces or less post-processing → Sparking
Example：
45mm*90mm→0.5g→THK:0.08mm50mm*100mm →1g/5g/10g →THK:0.01mm/0.05mm/0.085mm
60mm*120mm →50g/100g →THK:0.35mm/0.7mm
Among the six sizes of gold banknotes above, there are six corresponding sizes. Which die should be used for each?
According to the thickness of gold banknotes greater than 0.1mm, the sparking die can be preferred, the last two can choose the sparking die, and the first four need to use the lasering die. In addition, the thickness of gold banknotes is less than 0.01mm, and it is recommended to make a single-sided pattern, because the double-sided pattern cannot be pressed due to thickness.
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