On October 19, 2010, the LED tunnel light project of Qingdao Jiaozhou Bay Tunnel (including Qingdao terminal wiring project) was officially opened. Guangdong Zhonglong Transportation Technology Co., Ltd. stood out among the 12 bidders and became the winning bidder of the project.
Qingdao Jiaozhou Bay Tunnel Project is an important channel connecting Qingdao's main city and auxiliary city. It is connected to Xuejia Island in the south and to the group island in the north. The Jiaozhou Bay Tunnel is a city expressway tunnel with two-way double-hole and six-lane roads with a designed speed of 80km/h and a service tunnel in the middle. The total length of the tunnel is about 7.8km (including the Qingdao terminal connection project), of which the project spans about 3.95km. The whole line is illuminated by LED tunnel lights. The number of lamps used is about 6,500 sets. It is the largest project of LED lighting in single tunnels worldwide. It is also the world's largest single tunnel with LED tunnel lighting. It is second only to Shanghai Yangtze River. The construction of the tunnel (the tunnel is 8.9 km long).
Guangdong Zhonglong Transportation Technology Co., Ltd. won the bid for the lighting project of Qingdao Jiaozhou Bay Tunnel after winning the bid for the LED Tunnel Light Project of Shanghai Yangtze River Tunnel in 2009, which indicates that the technology and quality of Zhonglong LED Tunnel Lighting has been further recognized by customers.
Thick Copper PCB are used extensively in power electronic devices and power supply systems. A growing trend in the PCB industry, this unique type of Heavy Copper PCB features a finished copper weight of more than 4oz (140μm), compared to the 1oz (35μm) or 2oz (0μm) copper weight generally found in those with a Standard PCB copper thickness.
The additional copper PCB thickness enables the board to conduct a higher current, achieve good thermal distribution and implement complex switches in a limited space. Other advantages include increased mechanical strength at connector sites, the ability to create a smaller product size by incorporating multiple weights on the same layer of circuitry and the ability to use exotic materials to their maximum capacity with minimal risk of circuit failure.
PCB Manufacture Capabilities
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Features |
Capabilities |
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Layers |
1-36 layers |
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Material |
FR-4, Aluminum, Copper, Polyimide, high frequency (Rogers, PTEE, PI), etc. |
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PCB Type |
FR-4 Standard PCB, Aluminum PCB , Copper-based PCB, HDI PCB , Rigid-Flex PCB, Flex PCB, Thick copper PCB and Rogers PCB, etc. |
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Board Thickness |
0.1mm-6.0mm |
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Copper Thickness |
1/2oz-6oz(18um-210um) |
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Biggest Board size |
600mm*1200mm |
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Min Tracing/Spacing |
0.075mm/0.075mm (3mil/3mil) |
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Min drilling Hole diameter |
0.15mm(6mil), 0.1mm(4mil)-laser drill |
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Solder Mask |
Green, Black, White, Red, Yellow, Blue and Purple, etc. |
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Silkscreen color |
White, Blue, Black, Red, Yellow |
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Surface finish |
HASL Lead free, Immersion Gold (ENIG), Immersion Tin, Immersion Silver, OSP, Carbon oil, etc. |
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Special Techniques |
Impedance Control, Gold Fingers, Blind/Buried vias, Peelable solder mask, Half holes, Via-in-Pad and Countersink hole, etc. |
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