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Technology Sharing: Steps for PCB Recycling

Technology Sharing: Steps for PCB Recycling

  • Categories:Industry News
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  • Time of issue:2019-01-09 15:39
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Technology Sharing: Steps for PCB Recycling

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Any item will be damaged if it is used continuously, especially electronic products. However, the damaged items are not completely waste, but can be recycled, and the same is true for PCBs. Moreover, with the advancement of science and technology, the number of electronic products has increased sharply, shortening their use cycles, and many products are discarded without being damaged, leading to serious waste.

Products in the electronics industry are updated very quickly, and the number of discarded PCBs generated therewith is also very staggering. Every year, there are more than 50,000 tons of discarded PCBs in the UK, and as many as 100,000 tons in Taiwan. Recycling is the principle of resource conservation and green production. Moreover, there are some substances in electronic products that are harmful to the environment, and recycling is inevitable.

The metals contained in PCB include common metals: aluminum, copper, iron, nickel, lead, tin, zinc, etc.; precious metals: gold, palladium, platinum, silver, etc.; rare metals such as rhodium and selenium. PCB also contains a large number of high-molecular polymers directly or indirectly derived from petroleum products, which have a high calorific value. They can be used to generate energy and produce related chemical products. Many of the components are toxic and harmful. If discarded, it will cause great pollution.

The PCB template is composed of a variety of elements, even if it cannot be used normally, the elements can still be recycled. So, how to recycle, let's introduce its steps:

1. Paint stripping
The surface of the PCB is coated with protective metal, and the first process of recycling is to remove the paint. Paint removers include organic paint removers and alkaline paint removers. Organic paint removers are highly toxic and harmful to the human body and the environment. They can be dissolved by heating with sodium hydroxide and corrosion inhibitors.

2. broken
After the PCB is dismantled, it will be broken. There are methods such as impact crushing, squeezing crushing and shearing crushing. The more commonly used is the ultra-low temperature freezing and crushing technology, which can cool tough materials, make them brittle and crush them, so that metals and non-metals are completely dissociated.

3. sorting
The pulverized material needs to be sorted according to the density, particle size, magnetic permeability, electrical conductivity and other characteristics of its various components. There are usually dry and wet sorting. Dry separation includes dry sieving, magnetic separation, electrostatic, density and eddy current separation. Wet separation includes hydrocyclone classification, flotation, hydraulic shaker, etc. The sorted substances can be reused.

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The evaluation system of the circuit board factory should follow the following principles

The evaluation system of the circuit board factory should follow the following principles

Establishing a good cooperative relationship with circuit board factories is conducive to cost reduction, response time reduction and the creation of new market value, etc. The core issue is how to choose the ideal circuit board factory. There are many factors involved in the evaluation of circuit board factories, and the evaluation index systems are diverse, both qualitative and quantitative, and the index weights are also different. Therefore, it is necessary to establish a universal and expandable evaluation index system for circuit board factories. , And the indicator system should follow the following principles:
The use of soft and hard circuit boards?

The use of soft and hard circuit boards?

In our daily life, circuit boards are mostly single-sided, double-sided, or multi-layer boards, rigid boards, metal-based circuit boards, aluminum, copper substrates, thermally conductive fiberboards, etc., do you know what a flexible and rigid circuit board is? Rigid-flex circuit board: refers to a special circuit board made by pressing a rigid circuit board (PCB) and a flexible circuit board (FPC). The main board materials used are rigid board FR4 and flexible board polyimide (PI). Rigid and flexible circuit boards combine the rigid characteristics of rigid circuit boards and the advantages of flexible circuit
Soft and hard circuit board production process

Soft and hard circuit board production process

The flexible and hard circuit board is the flexible circuit board and the rigid circuit board. After pressing and other processes, they are combined according to the relevant process requirements to form a circuit board with FPC characteristics and PCB characteristics. In the past, two hard boards were connected by using soft boards and connectors to connect each other. In order to improve the reliability of the connection between the rigid board and the flexible board, the flexible board is directly fabricated between two rigid boards in the printed circuit board (PCB) factory, which can avoid the subsequent connection process, whether it is a rigid board manufacturer or FPC manufacturers are now able to supply rigid-flex boards. Under the demand for light and thin end products, the

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