source:Industry News release time:2021-09-13 Article author:sznbone Popular:pcb
There are at least 5 million TV sets, 4 million refrigerators, and 6 million washing machines in my country every year that reach the end of life; 8 million tons of waste electronic products need to be processed every year. In addition, as the upgrading of electronic products such as computers, mobile phones, VCDs, and DVDs accelerates, the number of scrapped products will also rise sharply. How to better recycle these waste products called "e-waste" deserves attention. Abandoning home appliances contains huge resources. The plastics and the gold, silver, copper, aluminum and other precious metals and non-ferrous metals contained in waste home appliances have great resource reuse value. my country has now entered the peak period of household appliance scrapping, and the entire market has reached tens of billions of yuan.
The waste circuit boards currently on the market are mainly home appliances, computers and other circuit boards. Therefore, it can be divided into several categories for recycling. Those with electronic components need to be disassembled manually, and then the circuit board recycling equipment is used for disassembly and recycling; those without electronic components can be directly shredded and recycled.
Used circuit boards and circuit boards are all treasures
Waste circuit board disposal method I think many people don't know much about this, or just know a general idea. At present, the recycling of waste circuit boards has become an industry, which has far-reaching significance for social development. Recycling waste circuit boards can reduce resource waste, environmental pollution and other issues. The equipment and processes for the physical treatment and recycling of waste printed circuit boards mainly include the crushing and dissociation of waste printed circuit boards, and the separation of metals and non-metals by dry and wet separation techniques.
The study found that when crushed to 1.2mm, the waste motherboard can be basically dissociated. The crushed product contains about 6% copper, 18% other metals, and 76% non-metals; copper is mainly distributed in the powder <0.5mm, and the metal is mainly In the >0.5mm particle size; the high-frequency air separator can effectively separate non-metals and metals, and it has a wide range of separation particle size, low separation limit, and low operating cost. It is an ideal dry separation.
Circuit board recycling process
The recycling of "e-waste" in my country started late and developed rapidly. In recent years, relevant departments have successively promulgated policies and regulations such as the "Regulations on the Management of the Recycling and Disposal of Waste Home Appliances and Electronic Products" and the "Administrative Measures on the Pollution Control of Electronic Information Products", which have promoted the gradual transformation of the electronic information industry into an environmentally friendly and resource-saving green industry. At present, in the "Yangtze River Delta" and "Pearl River Delta" regions, there are already many companies whose main business is to dismantle "e-waste", forming a veritable circular economy, which on the one hand solves the employment problem and saves national investment On the other hand, it reduces resource consumption and waste discharge. This "e-waste" recycling model of "cheap renewable resources + cheap second-hand equipment + cheap labor = cheap products" highlights the efficient use of resources and the pursuit of large economic and social benefits with less resource consumption and environmental costs. It is worth paying attention to.
On the basic knowledge of PCB circuit board copper foil
1. Introduction to copper foil
Copperfoil (copper foil): a kind of cathode electrolytic material, a thin, continuous metal foil deposited on the base layer of the PCB circuit board, which acts as the conductor of the circuit board. It easily adheres to the insulating layer, accepts the printed protective layer, and forms a circuit pattern after corrosion. Coppermirrortest (copper mirror test): A flux corrosion test that uses a vacuum deposition film on a glass plate.
Copper foil is made of copper and a certain proportion of other metals. Copper foil generally has 90 foil and 88 foil, that is, the copper content is 90% and 88%, and the size is 16*16cm. Copper foil is the most widely used decorative material. Such as: hotels, temples, Buddha statues, golden signs, tile mosaics, handicrafts, etc.
2, product characteristics
The copper foil of the PCB circuit board has low surface oxygen characteristics, and can be attached to a variety of different substrates, such as metals, insulating materials, etc., and has a wide temperature range. Mainly used in electromagnetic shielding and anti-static. The conductive copper foil is placed on the surface of the substrate and combined with the metal base material. It has excellent conductivity and provides electromagnetic shielding effect. Can be divided into: self-adhesive copper foil, double-conducting copper foil, single-conducting copper foil, etc.
Electronic grade copper foil (purity above 99.7%, thickness 5um-105um) is one of the basic materials of the electronics industry. The rapid development of electronic information industry, the use of electronic grade copper foil is increasing, and PCB circuit board products are widely used in industry Use calculators, communication equipment, QA equipment, lithium-ion batteries, civilian televisions, video recorders, CD players, photocopiers, telephones, air conditioning, automotive electronic components, game consoles, etc. The domestic and foreign markets have an increasing demand for electronic grade copper foil, especially high-performance electronic grade copper foil. Relevant professional organizations predict that by 2015, China's domestic demand for electronic grade copper foil will reach 300,000 tons, and China will become the world's largest manufacturing base for printed circuit boards and copper foils. The market for electronic grade copper foil, especially high-performance foil, is optimistic. .
3. Global supply status of copper foil
Industrial copper foil can be commonly divided into two categories: rolled copper foil (RA copper foil) and point solution copper foil (ED copper foil). Among them, rolled copper foil has good ductility and other characteristics, which is used in the early soft board process. Copper foil, while electrolytic copper foil has the advantage of lower manufacturing cost than rolled copper foil. Since rolled copper foil is an important raw material for flexible boards, the improvement of the characteristics of rolled copper foil and price changes have a certain impact on the flexible board industry.
Since there are fewer manufacturers of rolled copper foil, and the technology is also in the hands of some manufacturers, customers have a low degree of control over price and supply. Therefore, under the premise of not affecting product performance, electrolytic copper foil is used instead of rolling Copper foil is a feasible solution. However, if the physical characteristics of the copper foil itself will affect the etching factors in the next few years, the importance of rolled copper foil will rise again in the thinning or thinning of products, and high-frequency circuit board products due to telecommunications considerations.
There are two major obstacles to the production of rolled copper foil, resource obstacles and technical obstacles. The resource barrier refers to the need for copper raw materials to support the production of rolled copper foil, and it is very important to occupy resources. On the other hand, technical obstacles discourage more new entrants. In addition to calendering technology, surface treatment or oxidation treatment technology is also the case. Most major global factories have many technology patents and key technology KnowHow, which increases barriers to entry. If the new entrants post-harvest processing and production, they are restrained by the cost of major manufacturers, and it is not easy to successfully join the market. Therefore, the global rolled copper foil still belongs to the market with strong exclusivity.
4. Development of copper foil
Copper foil in English is electrodepositedcopperfoil, which is an important material for the manufacture of copper clad laminate (CCL) and printed circuit board (PCB). In today's rapid development of the electronic information industry, electrolytic copper foil is called: the "neural network" of electronic product signal and power transmission and communication. Since 2002, the production value of China's printed circuit boards has surpassed the third place in the world. As the substrate material of PCB circuit boards, copper clad laminates have also become the world's third largest producer. As a result, China's electrolytic copper foil industry has developed by leaps and bounds in recent years. In order to understand and understand the past and present of the world and the development of China's electrolytic copper foil industry, and look forward to the future, experts from China Epoxy Resin Industry Association reviewed its development.
From the perspective of the production department and market development of the electrolytic copper foil industry, its development can be divided into three major development periods: the United States established the first world copper foil enterprise and the period when the electrolytic copper foil industry started; Japanese copper foil The period when enterprises fully monopolize the world market; the period when the world is multi-polarized and competes for the market.
Read recommendations:
Popular recommended products
Aluminum substrate (double-sided)
2021-04-27Single-sided double-layer AL base PCB
2021-04-27Six-layer Immersion Gold Board (BGA)
2021-05-24Six-layer Immersion Gold Board (BGA)
2021-05-27Six-layer Immersion Gold Board (BGA)
2021-04-27Laminate copper-based PCB after 4L (sample)
2021-04-27Six-layer Immersion Gold Board (BGA)
2021-04-27Six-layer Immersion Gold Board (BGA)
2021-04-27High frequency PCB
2021-04-27High frequency PCB
2021-04-27Mobile phone template (six layers)
2021-04-27Single copper base PCB
2021-04-27Six-layer Immersion Gold Board (BGA)
2021-05-27Six-layer Immersion Gold Board (BGA)
2021-05-27Six-layer Immersion Gold Board (BGA)
2021-05-24Network communication board (sixth floor)
2021-04-29Silver oil perforated plate (double-sided)
2021-04-27High frequency PCB
2021-04-27Six-layer Immersion Gold Board (BGA)
2021-04-27Computer card board (four layers)
2021-04-25Display board (six layers)
2021-04-27High frequency PCB
2021-04-27Six-layer Immersion Gold Board (BGA)
2021-05-27Six-layer Immersion Gold Board (BGA)
2021-04-26Six-layer Immersion Gold Board (BGA)
2021-04-26SMT stickers
2021-05-27Six-layer Immersion Gold Board (BGA)
2021-04-26SMT stickers
2021-05-27DIP plugin
2021-05-27Mobile phone board
2021-04-27Six-layer Immersion Gold Board (BGA)
2021-04-26Six-layer Immersion Gold Board (BGA)
2021-04-26Mobile phone board
2021-05-27DIP plugin
2021-05-27Related Information
Composition of PCB
2024-09-29What is the difference between PCB and PCBA
2024-09-10PCB usage tips
2024-08-20Why do the circuit boards are green
2024-08-12How to clean the aluminum substrate?
2024-08-06Maintenance of Chemical Copper Plating Solution on PCB Board
2024-07-22single-sided PCB board and double-sided PCB board
2024-07-15PCB board production process flow
2024-07-09PCB CTI level
2024-07-01Via technology in circuit board factory.Automotive Electronics PCB
2024-06-25The role of FPC flexible circuit board solder mask
2024-06-18Detailed explanation of PCB board sampling production process
2024-06-11pcb v-cut depth standard
2024-05-27Multilayer Printed Circuit Board.What is the eq of PCB
2024-05-20The relationship between PCB safety distance and voltage
2024-04-22SMT surface mount processing.Hybrid circuit board PCB
2024-04-15PCB enterprises should pay attention to SMT matters.Electronic components PCB
2024-04-03PCB - the core building block of electronic products.Automotive Electronics PCB
2024-03-25PCB - the bridge and link of the electronic world
2024-03-18How to define high-frequency and high-precision circuit boards.Industrial Electronics PCB
2024-03-11USB PCB interface layout and wiring requirements
2024-01-22Electrolytic capacitor PCB.Steps for using PCB pins
2024-01-15Automotive ElectronicWhat aspects should be considered when processing and manufacturing PCB boards?
2024-01-08Electrolytic capaciWhat is the difference between a gold-plated circuit board and a gold-plated one?
2023-12-25When grinding PCB boards, attention should be paid to.Oscillator (belonging to crystal) PCB
2023-12-18Industrial Electronics PCB!What precautions should be taken when copying and grinding PCB boards
2023-12-11Do you know who is more suitable for LED direct display, regarding the difference between PCB board
2023-12-05Aluminum electrolytic capacitor PCB.What are the standards for selecting PCB boards
2023-11-27Surface Mount Technology (SMT) Phase PCB
2023-11-20Oscillator (belonging to crystal) PCB.The main functions of PCB board
2023-11-13