When do liquid material coating engineering for printed circuit board, there are always bubble remaining in the paint, like the bubbles in the resin film, or green paint printing film in the air, the air bubble on the board in the electrical or physical properties are very bad.
Automatic Optical Inspection is to use ordinary light or laser light to cooperate with computer programs to perform visual Inspection of the surface of the circuit board to replace the Optical equipment of the manual Inspection.
In order to ensure the completion of the circuit the system resolution, so it needs to be in high voltage (250 V) multipoint of universal electrical measuring machine tool, the specific contact needle plate of electric logging on board, this universal Testing machine of Automatic Testing Equipment.
In the circuit board producing process, local plate surface or local plate, or local copper foil float, are known as Blister.In the process of ordinary plating, it is often used because of the uncleanness of the substrate, and the coating bubbling occurs, especially in the post-baking of the silver-plated object.
When the board lost its Flatness, with its concave down on a flat table, if can't keep the voids is four o 'clock on a plane, it is called a plate bending or become Warp or Warpage, if only three points fall on the plane, referred to as the plate Twist .But usually this kind of twist is slightly less obvious, commonly known as "Warpage".
The improper short circuit occurred between two lines originally supposed to be isolated from each other.
The defect in the appearance of the base plate may be due to the division between the local fiberglass fabric and the epoxy resin, or the fabric itself, which can be seen in the white area as Crazing.The smaller and only one that appears on the dot is the "Measling".In addition, it is also known as Crazing when the surface of the assembly is coated with a Conformal Coating.Usually general commodity porcelain, or ceramic tile, after long use of aging, also because of the release of the force, and on the surface irregular crack, also known as Crazing.
The data measured is not good, and the gap between its and normal acceptance specifications is called Deviation.
When there is some undesirable quality defect in the zero component or product, or because of the bad factor, the normal operation cannot be carried out, which is called Fault.
In a broad sense, there are some abnormal foreign objects, such as ashes, sand and resists in the fluted liquid.Or the plate resin and the abnormal particles in the coating.The narrow meaning refers to the whole or partially covered foreign body in the molten tin or solder layer to form a rough, tin, or blocky appearance.
In the circuit board industry, it means the front and back sides of the board, when the board lost its Flatness , with its concave down on a flat table, if can't keep the voids is four o 'clock on a plane, it is called a plate bending or become Warp or Warpage, if only three points fall on the plane, referred to as the plate Twist.But usually this kind of twist is slightly less obvious, commonly known as "Warpage".