Copper plate making process
The substrate materials used for printed boards can be divided into two broad categories: rigid substrate materials and flexible substrate materials. The important variety of general rigid base material is ccl. It is used for reinforcing material (Reinforeing Material), impregnated with resin adhesive by drying, cutting, laminating blank, and then covered with copper foil, as die steel, in the hot press with high temperature and high pressure forming process and made. A semi cured sheet used in a general multilayer board is a semi-finished product (mostly made of glass cloth dipped in resin and dried by a process) in the process of making copper clad laminate.
According to the flame retardant properties of CCL classification, can be divided into flame retardant (UL94, VO, UL94, a V1 class) and non flame retardant (UL94, HB level) two kinds of plates. In the past one or two years, with the increasing attention to environmental protection, a new type of non brominated CCL has been isolated in flame retardant CCL, which can be called "green flame retardant cCL"". With the rapid development of electronic product technology, cCL has higher performance requirements. Therefore, the performance classification of CCL is divided into general performance CCL, low dielectric constant CCL, high heat resistance CCL (general board L above 150 degrees), low thermal expansion coefficient CCL (commonly used for packaging substrate) and so on.
There are a variety of classification methods for copper clad laminates. According to the general board reinforced with different materials can be divided into: paper base, glass fiber cloth, composite base (CEM Series), build up multilayer plate base and special material (ceramic, metal core based) five categories. Classified according to the resin adhesive used on the plate, the common paper-based CCI. There are: phenolic resin (XPc, XxxPC, FR, 1, FR, a, 2, etc.), epoxy resin (FE, 3), polyester resin and other types. Glass cloth CCL common epoxy resin (FR-4, FR-5), it is the most widely used type of glass fiber cloth at. In addition to other special resin (glass fiber cloth, poly amide fibers, non-woven fabrics and other materials to increase): bismaleimide modified three triazine resin (BT), polyimide resin (PI), two phenylene ether resin (PPO), maleic anhydride imide - styrene resin (MS), poly isocyanate ester resin, polyolefin resin etc..
