Polyester HASL PC Double Layer FPC Board
The flexible printed circuits boards high temperature carrier film, is made of a high-performance polyimide film coated with special adhesive, which is suitable for press protection for FPC flexible printed circuits boards.With silicon-free release film, you don’t have to worry about the moving of it. There is no residue, no trace and low pollution when the products attached to the FPC. We increase its stiffness by using the carrier film, get the protective effect of the FPC substrate at subsequent stations, thus obtain additional mechanical stability. The way of softness and hardness combination makes it possible to process ultra-thin aluminum foil, and prevent wrinkling and defacement effectively during the production of flexible circuit boards and processes. It is a unique combination of low shrinkage, no curl, no residue, easy to peel off and can withstand 180-200℃.The available thickness includes 36、50、75、100 and 125μm,the width and adhesive strength can be customized upon your request.
The Flexible Printed Circuit Board,which is short for FPC and is also called Flexible Board, is a kind of printed circuit board made of soft insulated-basis material(commonly polyimide or polyester film). It has many merits compared with Rigid PCB,such as bending, winding and folding freely. The FPC can reduce the volume of electronic products and meet the requirements of electronic products, helping to develop into high-density, small-size, high reliability ones. Nowadays, FPC have been widely used in in the aerospace, military, mobile communications, notebook computers, computer peripherals, PDA, digital cameras and other fields or products.Flexible circuit board structure:
E.D.and R.A.copper foil Cu copper layer. There are three types of copper sheet, RA, Rolled Annealed Copper and ED, Electrodeposited.ED and RA have different characters due to different manufacturing principles.Copper is low-cost but brittle,the copper body is easy to break when doing bend or driver. RA copper manufacturing costs are high but flexible, so the FPC copper foil mainly uses RA copper.
A (Adhesive) : Acrylic and epoxy thermosetting adhesives
PI (Kapton) : Polyimide Adhesive is divided into Acrylic acrylic resin and epoxy resin. Polyimide is short for PI and is named Kapton in DuPont. It has a unique combination of thin, high temperature and drug resistance, good electrical insulation.
high-temperature carrier film—Solve plicated and useless problems of single-sided FPC board.
Some customers prefer a “quick n’ dirty”, low-cost product. The PET circuit is an ideal affordable approach. The problem some customers run into is when they experience a change in their requirements. The increased requirements simply are not achievable with a PET design. For instance, surface mount components such as LEDs, capacitors, and even integrated circuits can’t reliably be attached to a PET circuit, especially when dealing with smaller package sizes, footprints, and rugged environment applications.
As you go smaller in package size and add more components, your risk for failure due to an open circuit increases. If you find yourself in a similar situation, look toward the use of a polyimide flex circuit.
The primary reason for the large reliability swing is the difference between the component attachment techniques of PET vs FPC style circuits. PET circuits use a conductive epoxy paste (like glue) to affix components to the circuit pads and traces. This is a proven assembly process and manufacturers have developed methods to surface mount components repeatedly with impeccable precision. However, the bond is only as strong as the mechanical strength of the conductive epoxy, which is why the polyimide FPC circuit is the best solution for high reliability applications.
While the PET circuits use epoxy to attach components, FPC polyimide circuits use a soldered connection that can be up to three times as strong as the conductive glue. If your end application is bound to find itself in environments with excessive vibration, extreme heat or cold temperature swings, or demands high reliability performance, consider a polyimide circuit versus a PET circuit.
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