What is circuit board sulfur-free paper (PCB sulfur-free paper)?

Have you ever thought that behind those sophisticated circuit boards, there is a kind of seemingly ordinary but vital paper playing a role in silence? That is circuit board sulfur-free paper, also called PCB sulfur-free paper. Many people may hear this name for the first time, the heart will be muttering: what in the end is a magical thing? Today, I'll come to talk to you about the circuit board without sulfur paper.

First of all, let's talk about what the circuit board sulfur-free paper. Simply put, it is a special sulfur-free paper, specifically for the printed circuit board (PCB) manufacturing process. Compared with traditional sulfur-free paper, it has a different surface treatment and composition ratio to meet the special needs of PCB manufacturing.
PCB sulfur-free paper is simply a special paper used in the PCB (Printed Circuit Board) manufacturing process, and its most important characteristic is that it does not contain sulfur. This is not an ordinary characteristic, it has a vital significance for the manufacture of circuit boards.

Circuit board sulfur-free paper application scenarios are mainly printed circuit board silver-plated products packaging, such as circuit boards, circuit boards, hardware terminals, etc., can see its figure. And it can also play a role in protecting products in food packaging. However, to say it is the most important application, but also in the field of circuit board manufacturing.
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 board, can effectively reduce the contact between silver and sulfur; at the same time, the sulfur-free paper can also play a role in isolation, to avoid other possible damage to the silver-plated layer of the material in contact with the circuit board. Therefore, the sulfur-free paper for the protection of the circuit board silver-plated layer, to extend the service life of the circuit board has a vital role.

So, what are the specific advantages of PCB sulfur-free paper?

First of all, in terms of quality, sulfur-free paper whiteness is good, looks clean and tidy, let a person look at the peace of mind. And the paper is smooth, which is not easy in the packaging or use process on the circuit board caused by scratching and other damage.
In terms of physical properties, sulfur-free paper tensile toughness is not easy to break. Imagine, if the sulfur-free paper is easy to break, in the process of packaging or transportation of circuit boards, once the paper rupture, can not be well protected circuit boards, is likely to lead to damage to the silver-plated layer. This concern does not exist with Kontron Paper's sulfur-free paper, which is able to remain intact in a variety of situations, providing continuous and reliable protection for circuit boards.
Moisture resistance is also a highlight. Circuit boards are very afraid of moisture, and once damp, it may affect the performance of its internal electronic components and even lead to serious problems such as short circuit. Sulfur-free paper has good moisture resistance and can effectively block the intrusion of external moisture, so that the circuit board can be properly protected even in a humid environment. At the same time, it is highly breathable, which helps to form a good air circulation inside the package, reducing the problem of water vapor accumulation that may occur due to lack of air circulation.
What's more, sulfur-free paper excels in environmental protection. It is an environmentally friendly paper material, also known as halogen-free paper, which does not contain harmful substances such as chlorofluorocarbons and compounds, and is not harmful to the environment or human health. In today's increasingly environmentally friendly era, such a product is undoubtedly more in line with the trend of industry development.

Sulfur-free paper is suitable for use in various clean rooms, small and large electronic factories and circuit board PCB factories, LCD factories, precision assembly projects, semiconductor factories, CD-ROM factories, laboratories and so on. Moreover, it is economical, not easy to be deformed and has a long service life. Like some paper may be used a few times on the deformation can not be used, but the sulfur free paper is more durable, which for the enterprise, can reduce costs to a certain extent.