Single panel and insulation board distinction

Single panel history:
Single-sided printed circuit board is the early 1950s with the emergence of transistors, the United States as the center of the product developed, when the main production methods to copper foil direct etching method for the mainstream. 1953 ~ 1955, Japan imported copper foil for the first time made of paper phenolic copper foil substrate, and a large number of applications in the radio. In 1956, the Japanese circuit board professional manufacturers, single-panel manufacturing technology then rapid progress. In the material, the early to paper-based phenolic copper foil-based, but because of the material at the time of electrical insulation is low, poor heat resistance welding, twisting and other factors, one after another paper ring resin, glass epoxy resin and other materials Development, the current consumption of electronic equipment required for a single panel, almost using paper phenolic substrate board.
Single panel features:
The single panel is on the most basic PCB, the parts are concentrated in one side, the wires are concentrated on the other side. Because the wires only appear on one side, we call this kind of PCB called single-sided. Because there are many strict restrictions on the design of the single-sided board (because there is only one side, the wiring can not cross and must be around the path), so only the early circuit to use such a board;
Single-panel wiring diagram to network printing (Screen Printing), that is, printed on the copper surface of the resistance agent, after etching and then anti-solder mark on the mark, and finally punching processing to complete the parts guide hole and shape. In addition, a small number of diverse production of products, the use of photoresist to form a pattern of photography.
Insulation board, also known as insulation pads, insulation pads, insulation pads, unsaturated polyester glass mat sheet. Insulating mats are widely used in substations, power plants, distribution rooms, laboratories and field live operations.
The use of plastic insulation materials, insulation pad on the surface should be no harmful irregularities. Insulation mats Hazardous irregularity refers to one of the following characteristics, namely, damage to uniformity, damage to the surface smooth contour defects such as small holes, cracks, local uplift, incision, inclusions conductive foreign bodies, creases, voids, embossed corrugations and casting Logo and so on. Harmless irregularity refers to the surface irregularities that are formed in the production process.
In the entire insulation board should be randomly selected more than five different points for thickness measurement and inspection. Can be measured using thousands of points of mind or the same precision of the instrument. The accuracy of the micrometer should be within 0.02mm, the diameter of the drill is 6mm, the diameter of the flat presser foot is (3.17 ± 0.25) mm, and the presser foot should be able to apply the pressure of (0.83 ± 0.03) N. The insulation pad should be placed flat Make the micrometer between the measurements smooth.