The importance of PCB laminates
Published time: 2019-11-30
The current world requires innovation in high-performance electronic equipment, which in turn requires highly developed PCB laminates with improved electrical properties and better mechanical stability. PCB laminate manufacturers are now working to provide a variety of high-performance laminates. These new circuit board laminates have a wealth of properties that can suppress the problems associated with the flame retardancy of traditional epoxy-based FR4 laminates and laminates, and electronic component temperature is no longer a challenge. This article is a detailed guide that points out the basics of laminates in the PCB manufacturing process. For the short-term drive of various types of laminates, the characteristics of laminates and their importance as well as new developments in laminate technology are what it is trying to emphasize.
Before briefly introducing the importance of PCB laminates, let us first briefly introduce the basics of circuit board laminates and their detailed information. This article will provide you with the exact understanding you need to determine the materials used in printed circuit board manufacturing, as well as choosing the type of laminate that fits your particular project.
A stack of materials laminated in a trace layer inside a circuit board by applying pressure and heat within the required time is called PCB lamination. This makes it a one-piece product that is laminated with top and bottom prepregs and then copper foil. In short, it includes a typical process of laminating a non-conductive substrate with conductive tracks and etched pads from copper, which helps to achieve smooth circuit connections through mechanical support for printed circuit boards. The basic materials used and processed in PCB manufacturing include copper-clad laminates, Pre-preg (resin impregnated B-stage cloth), copper foil, and laminates. These are made by curing the temperature and pressure layers of a cloth or paper with a thermosetting resin that forms a uniformly thick monolithic piece to obtain the final laminated substrate.
The use of fiber material or cloth, the ratio of cloth to resin and resin material determines the type of laminate. These laminates can be determined based on their requirements for free flame retardant level, tensile strength, glass transition temperature, loss coefficient, shear strength, dielectric constant, and expansion coefficient reflecting thickness as a function of temperature.
FR-4 has become standard equipment and is now replaced by many new technologies that provide more efficient electrical solutions. They are made of woven glass fiber with epoxy resin and can be applied to switches, arc shields, relays and screw terminals. Considering the importance of environmental safety, halogen-free circuit board laminates are becoming an upcoming innovation trend. Polyimide laminates are rich in properties, have physical flexibility and high heat resistance in high temperature fuel cells, and have increased demand in the aerospace, military, and electronics industries. One of the rugged laminates for outdoor environmental applications has a very high temperature resistance ceramic, which proved to be a suitable solution. No doubt it may prove to be expensive when high-speed data transmission is required, but it has applicability in solar projects. Thin printed circuit board laminates are used in high frequency applications, such as using thinner substrates in millimeter wave or microwave applications.
Before choosing the PCB technology that best fits your electronics design and manufacturing project, you should also pay attention to the performance of laminates based on current research and development trends. Laminates with precise mechanical, thermal and electrical properties should also have sufficient and tough chemical resistance, humidity resistance and flame resistance. Other characteristics that need attention are foil resistance, surface and edge corrosion resistance, fine surface finish and thickness tolerances, flammability and water absorption.
It comes down to our main concern, why do we have important characteristics of using laminates in PCB manufacturing? The importance of laminates in PCB manufacturing includes obtaining improved impedance control in dynamic thermal reactions, low moisture absorption, and better Thermal management and consistent performance. With new discoveries and continuous innovations in all electronic tasks, high-frequency laminates have become a core factor in the growth of PCB technology.
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