The initial introduction of photoresist resist plating ink: As early as the late 1980s, a PCB board manufacturer in Guilin introduced the first brand of photoresist resist plating ink (hereinafter referred to as wet film or ink) from Japan. To replace the dry film processing circuit board manufacturing pattern mask to complete copper and lead tin plating. At the time, circuit board manufacturers used dry film resists as masks for pattern plating. But because the wet film has excellent anti-etching and anti-electroplating personality; and it has the ability to resist acid etching, under certain conditions (referring to the pH value of 8.3 ~ 8.8) can also withstand alkaline etching, so first It saves the circuit board manufacturer one (or one production line) installation cost and corresponding floor space.

Without adding any special facilities (only general screen printing facilities), this process can be smoothly applied, and no professional training is required in the application technology. The advantages of these applications are quickly accepted by manufacturers. In addition, in the application, because it is direct contact exposure, it can obtain high-resolution line width and line-to-line, and can easily produce 3mil (1mil = 25μm) line patterns, so it is widely used in circuit board, decoration and precision processing industries Favor. Although in the circuit board industry, there are disputes about the use of wet film, but its application range is getting wider and wider, and the rapid development speed has become an indisputable fact. Judging from the situation in the past two years, both the output, variety and application fields are constantly developing and expanding.

With the advancement of science and technology and the rapid development of economy in China, the wet film originally used for circuit board graphics mask is no longer a special material for an industry, but gradually expanded to electronics, aerospace, decorative tourism, light industrial products and precision Processing, and these are coated on the surface by the screen printing method.

Masks used for circuit board pattern plating and etching-resistant masks:

Initially, it was only used for single-sided and double-sided circuit boards (single-sided circuit boards were directly etched; double-sided circuit boards were made of anti-electroplating masks and then electroplated). Because of its good resolution, it has been widely used in many In order to meet the needs of production, the inner layer of the laminate has manufactured special coating facilities at home and abroad-the roll coating machine, which meets the requirements of automatic coating and greatly improves the production efficiency. So far, the application of wet films in the circuit board industry is about 6.5: 3.5 compared with dry films, and this ratio is gradually increasing.

Missing printing template for large-scale integrated circuit framework and SMT in the electronics industry:

The earliest large-scale integrated circuit frames were blank forming, because the shape of the frame is complex, the processing difficulty is higher, and the number of mold applications is less, so the processing cost will increase a lot. However, using a pattern etching method with a wet film as a mask will reduce the cost and increase the output, which is the most economical and ideal processing method at present. Other arrays and comb-shaped inserts are also etched with a wet film as a mask. The template used for SMT missed solder paste printing is generally etched into a hollow pattern using a wet film as a mask, except for laser engraving which requires high precision.

Used to manufacture springs or spirals used in grids, filters and precision instruments:

The finest wire of the grid can be up to 0.0125mm. The more prominent is that if the die is stamped and blanked, the shape of the burr becomes a big problem. The difficulty is that the material is thin and the pattern is complicated. The burr cannot be removed by mechanical methods, so , The above can not be completed by the mold.

Radar antennas in aerospace and radio communications:

The large area and strict size requirements, and the production of graphics after the wet film is photosensitive, solves this technical problem well, and saves a lot of expenses for the construction of the defense industry.

Signs, panels, decorative tourism products:

In the past, decorative travel products such as signs, panels, and sheets (plates) were used. In the production of graphics, bone glue using dichromate as a photosensitizer was used as an anti-corrosion mask. The photosensitizer Cr6 + becomes Cr3 + and stays on the board surface (that is, the graphic part), and the one that is displayed (washed away by water) is still Cr6 +. Cr6 + is a very serious source of pollution and carcinogen, which is extremely harmful to the human body. However, when the wet film is used, the generation of such pollution sources is completely eliminated. For example, the most popular metal commemorative cards, small ornaments and souvenirs are all made of wet film graphics.

Processing of graphics for complex molds:

With the continuous improvement of living standards, the production of some roller molds for leather, textiles, plastics, and artificial leathers has also started to use wet films as masks. The cost is low, the quality is good, and the graphics have better randomness. Compared with laser, computer engraving or machining costs, it can be reduced by 10 to 20 times. For example, when processing molds for napkins, according to user requirements, patterns and text can be personalized and diversified. In addition, most of the current molds use pressure roller molds. At this time, the use of wet films to produce anti-etching graphics shows its superiority.

Processing of precision parts:

When today's radio products are developing in the direction of short, small, light, and thin, other parts are also gathering in this direction, so the precision of some machined products is also constantly improving. In some areas, precision parts that cannot be processed are used. Wet film is made into a resist pattern and etched to obtain an extremely satisfactory effect. For example, a 0.495mm × 0.495mm convex body is made on a 0.5mm × 0.5mm iron-nickel alloy plate (thickness 0.2mm), which highlights the characteristics of the wet film.

Reproduction of artwork with photosensitive ink:

Recently, some wet film manufacturers have produced highly decorative color inks. This ink can be used to reproduce oil paintings and handicrafts of different forms and styles by a combination of photosensitive and screen printing. Recently, some experts have made gratifying achievements in the use of monochrome and hierarchical versions of metal figures for characters, and they have now begun to promote them.

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