PCB sheet material composition
Yueshan have created a melamine. wooden sheet for PCB drilling that responds to the increasing. demand of today’s rigid drill room needs. that want a robust drill back up board. wooden melamine coated board uses the best quality. raw materials fibreboard sheets to make sure performance and consistency.
A printed circuit board (PCB) is the board base for physically supporting and wiring the surface-mounted and socketed components in most electronics.
In applications where fine conductive traces are needed, such as computers, PCBs are made by a photolithographic process, in a larger scale version of the way conductive paths in processors are made.
Electronic components are typically placed by machine onto a finished PCB that has solder dabs in place. The PCB bakes in an industrial oven to melt the solder, which joins the connections. Most PCBs are made from fiberglass or glass-reinforced plastics with copper traces.
PCBs can be single-layer for simple electronic devices. Printed circuit boards for complex hardware, such as computer graphics cards and motherboards, may have up to twelve layers. PCBs are most often green but they can come in any color.
Other methods of PCB manufacturing include silk-screening and CNC-milling.
wooden melamine coated fiberboard backup sheet specification
Use: PCB/FPC drilling hole
Thickness: 2.5, 2.7mm±0.15mm
Surface Hardness: (80±5N/mm2 (Shores D) )
fibreboard sheets size:
37〞×49〞 41〞×49〞 43〞×49 〞
939x1244 mm, 1090x1244 mm
custom cut panel and sheet sizes obtainable. And can provide position hole drill service
Quality control:The high-quality of wooden back up board. assured by the tightest manufacture tolerances. together with permanent product control corresponding to ISO 9001.
storage: wooden melamine coated fiberboard backup sheet. should stay sealed in its initial packing until use. It must stored beneath the same heat and humidity circumstances. that surround the operating area. Rapid change of the conditions may cause moisture fall out leading to next warp.
Best storage at: 65° - 75°F (18° - 24°C)
HOLE QUALITY: prepared timber. produce a high density fiber board (HDF) with a minimal natural resin level. that will not contaminate the hole,ideal repalace for phenolic board.
drilling melamine process
Drilling for adjustable shelves can be a problem in melamine. A sharp brad-point bit will make a clean hole, but the melamine is hard on the cutting edges and a typical bit will dull. Production shops use special carbide-tipped bits that are expensive and hard to find.
For the weekend builder, the best way to drill holes in melamine is to use a router. A simple jig and a plunge router with a 5/8-in. guide bushing is the way to go. Use a 1/4-in. carbide down-spiral bit for flawless holes.
Routers are great for cutting dadoes in melamine, because it assures a chip-free cut. Unfortunately, melamine is about 1/128-in. over 3/4-in. As a result, if you try to use a 3/4-in. router bit to cut a dado, it’ll undersized—not a pretty picture come assembly time. You can get around this by making a 1/2-in. dado and creating a 1/2-in. tongue on the ends of the shelf with a rabbeting bit.
Typical wood glue won’t bond at all to melamine’s slick surface. That leaves you with a weakened glue joint where melamine meets particleboard. , you can buy specialized glue. that will bond melamine to a porous surface like particleboard. This is especially critical on more delicate joints, for instance. those used to construct a drawer.
The easiest way to cover exposed screw heads is with Fast Cap self-stick caps. These discs come in typical melamine colors and they’re a cinch to apply peel and stick.
Melamine needs to edged for a finished look. You can use iron-on edging, but self-stick edging is faster, easier and strong. peel, stick and give it a pass with a wood block or roller to push the adhesive into the particleboard. Maximum strength obtained in a week. One swipe with a double-sided edge trimmer cuts the tape flush.
A flush-fit screw cap looks a whole lot better than the surface-applied caps. Plus, they are less prone to getting knocked off. The FlushMount carbide drill bit cuts a shallow 9/16-in.-dia. countersink for the self-stick cap. An adjustable brad-point bit protruding through the center. of the carbide bit drills the pilot hole. Both bits can adjusted for depth of cut. drill, screw and cover. The caps are almost invisible. The same system can used on wood-veneered sheet stock.
Small nicks and gouges are easy to fix using SeamFil. It works like wood filler but it’s designed for plastic. work a little into the wound and scrape it flush using a putty knife. After the filler dries, use a utility razor to remove any excess. It makes a quick, easy repair that’s only noticeable at close range.