Laser marking application in SIM cards of mobile phone

Nowadays, nearly everyone has a smart phone. And each smart phone must come with a SIM card. So what is SIM card? SIM card is known as subscriber identify module. It plays a key role in GSM digital mobile phone system. It is an important part of the smart phone and an identity card for each of the GSM mobile phone user.

As smart phone becomes more and more popular, the SIM card market has an increasingly rapid development. SIM card is a chip card that has a microprocessor inside. It consists of 5 modules: CPU, RAM, ROM, EPROM or EEPROM and serial communication unit. Each module has its individual function.

In such a tiny SIM card, you will notice there are some barcodes and serial number of the chip. Traditional method to print them on the SIM card is using inkjet printing. But the symbols printed by inkjet printing is easy to be erased. Once the barcodes and serial number are erased, the management and the tracking of the SIM cards will become difficult. Besides, SIM cards with inkjet printed barcodes and serial number are easy to be copied by other manufacturers. Therefore, inkjet printing is gradually abandoned by the SIM cards manufacturers.

But now, with laser marking machine, the problem of “easy to be erased” can be perfectly solved. The barcode and serial number printed by laser marking machine are permanent and can not be changed. This makes those information unique and can not be replicated. Besides, laser marking machine can also be used in electronic components, PCB, instruments, mobile communication, precision accessory, etc..

The above mentioned applications of the laser marking machine have one thing in common - the working place is pretty small. That means the marking process needs to be extremely precise. And this makes UV laser very ideal, for UV laser is known for high precision and “cold processing”. UV laser will not contact the materials during operation and the heat affecting zone is quite small, so nearly no heat impact will work on the materials. Thus, no damage or deformation will be caused. To maintain the accuracy, UV laser often comes with a reliable water chiller unit.

S&A Teyu CWUL series water chiller unit is the ideal option for cooling UV laser marking machine. It features a high degree of precision of ±0.2℃ and integrated handles which allow easy mobility. Refrigerant is R-134a which is environmental friendly and can lower the impact to the environment. Find out more information about CWUL series water chiller unit at https://www.teyuchiller.com/high-precision-uv-laser-water-chillers-cwul-05-with-long-life-cycle_p18.html

Guangzhou Teyu Electromechanical Co., Ltd.

SKYPE: teyuchiller

Email: marketing@teyu.com.cn

Website: https://www.teyuchiller.com

Tel: + 86-20-89301885

Fax: + 86-20-84309967

About S&A Brand

S&A(TEYU) was founded in 2002. After 19 years of development, the headquarter covers an area of 18,000 square meters, and has about 300 employees.  

Why choose S&A

Product Advantages:

1. With 11 patent certificates，CE, RoHS and REACH approval; Conforms to air transport requirements; 2 years warranty;

2.±0.1℃ high precision temperature control, stable cooling performance,support 

ModBus-485 communication;

3. Establish logistic warehouses at USA and Europe;

Manufacturing Advantages:

1.Independent R&D on sheet metal, evaporator, condenser and cores parts of chiller;

2. Annual output 8 0,000 units, product exports rate above 60%；

3. Standard bulk production, standard parts rate up to 80% ；

4. With excellent laboratory testing system, simulates actual working environment for 

chiller.