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Why do circuit boards need to use sulfur-free paper? This has to start from the circuit board manufacturing process of some of the process. The main body of the printed circuit board is copper, which only reacts with oxygen in the air to generate dark brown cuprous oxide. In order to avoid oxidation, PCB in the manufacturing process there is a silver deposition process, so the PCB is also commonly known as silver-plated board. There is a silver deposition process in the manufacturing process, which has become one of the primary final appearance of printed circuit boards. However, there is a great affinity between silver and sulfur, silver in the air when encountering hydrogen sulfide gas or other sulfides, it is easy to generate very insoluble silver salts, resulting in yellowing and blackening of the product, that is, corrosion. Sulfur-free paper itself does not contain sulfur, will not react with the PCB surface of the immersed silver layer, the use of sulfur-free paper wrapped PCB b

Roll gray-backed cardboard is a kind of white linerboard with 2-3 layers of structure. It is a relatively high packaging cardboard. It is mainly used for sales packaging and is made into various types of cartons after color printing. The box plays the role of protecting products, decorating and promoting products, and may also be used to produce clothing hangtags, linings and the base plate of blister packaging plants. Rolled gray-backed white cardboard is also known as San Francisco paper. Rolled gray-backed white cardboard is used to print educational photos of children and logos of daily necessities, skin care products, and medicines. The basis weight is 200g/m2 to 400g/m2. The thickness is consistent, it does not pill or powder, it is malleable, and it is not easy to break when it expands and contracts.

Characteristics and uses of offset paper: Offset paper is a type of paper that we use daily, such as printing paper, exercise book pages, etc. Generally used are 60g/80g/100g, etc. Also known as Dowling paper, English is: wood-free printed paper. Offset paper refers to printing paper, also called coated paper. It refers to paper in which plastic particles are coated on both sides of the paper during the papermaking process to improve its physical properties. The quantitative analysis of some offset papers is between 60 grams and 120 grams, and there are also high-weight offset papers of 150 grams. Some offset paper on the market costs 7,000 to 9,000 yuan per ton.