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The majority of boards produced in the world are graphically produced. There are three alternative types: 1. Single-sided boards 2. Double-sided boards 3. Multilayer boards

Focus on speci c speaking situations where you need improvement. The more precisely you can identify your most anxiety-producing situations, the more success you will have in nding methods to deal with them.

561 Single-Sided Boards (SSBs) Single-sided boards (SSBs) have circuitry on only one side of the board and are often referred to as print-and-etch boards because the etch resist is usually printed on by screen-printing techniques and the conductor pattern is them formed by chemically etching the exposed, and unwanted, copper foil 5611 Typical Single-Sided Board Materials This method of board fabrication is generally used for low-cost, high-volume, and relatively low functionality boards In the Far East, for example, the majority of SSBs are made of paper-based substrates for lowest cost, with the most popular grade of paper-based laminate being XPC-FR, which is a flame-retardant phenolic material that is also highly punchable In Europe, FR-2 grade paper laminate is the most popular substrate for SSBs because it emits less odor than XPC-FR when placed in highvoltage, high-temperature environments, such as inside a television set chassis.

In the United States, CEM-1 material, which is a composite of paper and glass impregnated with epoxy resin, is the most popular substrate for SSBs While not as low cost as XPC-FR or FR-2, CEM-1 has gained popularity because of its mechanical strength and also because of the relative unavailability of paper phenolic laminates 5612 Single-Sided Board Fabrication Process Given the emphasis on cost and low complexity, SSBs are generally produced in highly automated, conveyorized print-and-etch lines, using the following basic process flow Step 1: Step 2: Step 3: Step 4: Step 5: Step 6: Step 7: Step 8: Step 9: Step 10: Step 11: Cut substrate into appropriate panel size by either sawing or shearing Place panel in loader which feeds them into the line Clean panels Screen panel with ultraviolet curable etch-resist ink Cure the etch-resist ink Etch exposed copper Strip the resist.

Apply solder resist Screen legend Form holes by drilling or punching Test for shorts and opens..

The conveyor speed of automated print-and-etch lines ranges from 30 to 45 ft/min. Some lines are equipped with an online optical inspection which enables the elimination of the final electrical open/short test. As previously noted, after the conductor pattern is generated in the print-and-etch line, holes for component insertion are formed on the panel by punching when the panel is made of paperbased substrate, but must be formed by drilling when the panel is made of glass-based substrate. 5.6.1.3 Process Variations. In some variations, the conductor surface of the PWB gets insulated, exposing only pads, and then conductive paste is screened to form additional conductors on the same side of the board, thus forming double conductive layers on a single side. Most metal-core PWB consumer applications are made of aluminum substrate, which comes as a copper-clad material. PWBs made of such material do not have through-holes, and components are usually surface-mount types. These circuits are frequently formed into threedimensional shapes.

Double-Sided Boards By definition, double-sided boards (DBs) have circuitry on both sides of the boards They can be classified into two categories: 1 Without through-hole metallization 2 With through-hole metallization The category of through-hole metallization can be further broken into two types: 1 Plated-through-hole (PTH) 2 Silver-through-hole (STH) 5621 Plated-Through-Hole Technology PTH technology is discussed in some detail in Sec 57; however, some comments are appropriate here Metallization of holes by copper plating has been practiced since the mid-1950s Since PWB substrate is an insulating material, and therefore nonconductive, holes must be metallized first before subsequent copper plating can take place The usual metallization procedure is to catalyze the holes with palladium catalyst followed by electroless copper plating Then, thicker plating is done by galvanic plating Alternately, electroless plating can be used to plate all the way to the desired thickness, which is called additive plating.