China is PCB producer, printed circuit board by the end of 2009 epoxy resin industry output of 150 million square meters, the world first, the output value of 130 billion yuan, has a certain scale PCB nearly 1000 enterprises, industry the number of employees more than 800000 people.Although the PCB industry develops rapidly, it is also one of the high energy consumption and high pollution industries in China.This paper will analyze and discuss the energy conservation and emission reduction measures of PCB industry based on clean production audit and energy audit.
1. PCB industry process
And pollution, use of energy
1. Production process of PCB
PCB industry production technology mainly includes the film production, the production of the inner layer and pressing, electroplating and outer production, surface processing forming and final treatment several stages, this article in view of the PCB production process were analyzed.

2. Analysis of energy and pollution
(1) using energy analysis
The main sources of energy used in the production of PCB production are electricity, steam and running water.The main power supply equipment is mainly used in cleaning machine, driving machine, chemical cleaning, exposure machine and other auxiliary equipment such as air compressor and freezer.Steam is mainly used for tank heating and staff life.Tap water is mainly used for dispensing, cleaning, cooling water supplement and pure water preparation.
(2) pollution analysis
PCB industry process divided into two categories: wet process and dry processing, dry processing mainly in cutting, drilling, cutting edge material, drilling several working procedure such as powder and other solid wastes, is most valuable waste containing copper.And wet process including coarsening, activation, anodizing, etching, plating nickel, tin, heavy gold, washing and so on more than 20 process for many times, to produce large amounts of waste liquid and waste water, which contains the non-ferrous metals such as copper, nickel, tin, pollutants and waste acid, waste alkali, COD, fluoride, cyanide wait a second pollutants.Due process, more complex and varied sources of pollution, to ensure the long-term stable discharging standard, must spend a lot of manpower, financial resources and a variety of advanced technology, its green management is a complicated system engineering.The printed circuit industry consumes a lot of high value copper, nickel, gold, silver and other precious metal resources, its waste value is a kind of non-negligible resource.

2.the status of energy conservation and emission reduction in PCB industry
During the period of “11th five-year plan”, in wuxi area to carry out the PCB manufacturing enterprise cleaner production audit, energy audit, based on the large and medium-sized PCB enterprises in recent years, energy consumption, water, waste water and energy conservation and emissions reduction work thorough investigation, the results show that the PCB industry in recent years, energy conservation and emissions reduction achieved substantial results, mainly manifested in the following aspects:
1. The management of enterprise resource consumption and pollutant emission has been gradually strengthened
From the survey of many enterprises, 90% of enterprises have energy and water management specialized agencies;75% of the enterprises have formulated the perfect water and energy management regulations.30% of enterprises use energy and water to achieve the three-level measurement management;90% of enterprise use can manage to achieve second-level metrological management;60% of the company’s water management is managed by secondary management.100% of enterprises have realized the online monitoring of waste water discharge, and 100% of enterprises have passed the iso 14001 environmental management system certification.
2. The total energy consumption has not increased significantly, and the energy consumption per unit of output has decreased.
Through to the various enterprises energy consumption data analysis showed that nearly three years, in addition to the expansion factor, all production total energy consumption survey fell (title is not a big increase in total energy consumption, not falling), 90% of enterprise total energy consumption decline control within 5%, only 10% of enterprise total energy consumption fell by more than 5% (10% of the enterprise is falling or not dropped 5% to 5%).Unit energy consumption?

3. The rate of reuse of industrial water will rise, and the amount of water and unit emissions per unit will decrease.
It can be seen from the analysis of the above production process and pollution link that in the production process of printed circuit board, there is quite a lot of water and water consumption is very large.Part of the reason may be that the perforation diameter of the multi-layer printed circuit board is < 0.15mm, and the density and spacing of wires are only 0.08 mm, even 0.05 mm.If not with plenty of running water first, again with plenty of water flushing repeatedly, may result in various residue in water in the hole and line, which affect the product function, light electronic products have noise, or cause a short-circuit, and even endanger the safety of the user.As a result, almost every process produced by printed circuit boards USES a lot of water to ensure product quality.However, in the actual production process, there are many links that can be improved and further water conservation.
According to the survey statistics show that 80% of the enterprise industrial water reuse rate rise more than 10%, enterprises take water, wastewater emissions per unit of output per unit of output are declined, no enterprise unit product withdrawals.3. Problems and development direction of energy conservation and emission reduction in PCB industry.
3.There are problems
1. The management mechanism of some enterprises is still extensive, and energy conservation and emission reduction measures are not in place
PCB production process produce large amounts of waste water, waste gas, waste residue, to deal with waste may be the effects on the environment, in general, companies need to invest a lot of care, material and financial resources to waste standard requirement, the main measures of prevention and cure is mostly about governance at the end.This leads to the phenomenon of energy conservation and emission reduction and the actual disconnection between production, and the failure to control the production and emission of pollutants from the source.Therefore, the energy conservation and emission reduction management mechanism is relatively extensive, and many energy conservation and emission reduction measures cannot be put in place.
2. Lack of investment in r&d of new technologies for energy conservation and emission reduction
PCB production is a continuous process, when to adopt new technology, new technology of energy saving and emission reduction, some enterprises because of the worry that the new technology, new technology will affect the PCB production process, so will choose to give up using these technologies or process.At the same time, due to the large number of PCB products and different production processes, it is difficult for some new technologies to be popularized and applied in other enterprises.
Note:
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