Low price dry film application tells about the classification knowledge of dry film according to use
Dry resist film and hole mask dry film are used to manufacture printed board images, while solder mask dry film is coated on the surface of the finished printed board to selectively protect the surface of the printed board so that when components are soldered It is also a permanent protective layer on the surface of the printed board, which can prevent moisture, mildew, and salt spray.
There are many formulations of aqueous dry film photosensitive adhesives, which are mainly composed of film-forming substances, photosensitive monomers, dyes (or pigments), photoinitiators, and solvents. The film-forming substance is phthalic anhydride resin, which is actually a binder, which binds the components into a film and provides the toughness of the film.
Dry film is relative to wet film. Dry film is a kind of polymer material, which can produce a polymerization reaction after being irradiated by ultraviolet rays, forming a stable substance attached to the board surface, so as to prevent electroplating and etching. Features.
The hot melt adhesive on sales generally dries fast, it is suitable for use in summer, but if it is used in winter, the cold air will accelerate the drying speed of the glue, which may cause the speed of process application to be slower. On, there will be the so-called sticky, false sticking phenomenon.
Because the characteristics of china hot melt adhesive are related, with the increase of temperature, the glue will become soft and the hardness will decrease. After reaching the flow point temperature, the glue will become thinner, and then it will lead to flow glue;
A hot melt adhesive, including a kettle body; a heating part, which heats the material inside the kettle body by means of steam heating; a stirring device, which stirs the material horizontally in the kettle body;