Plywood with a glass rod dimension adhered to the surface of the fiberglass board is manufactured under high temperature and high pressure, and its outer surface has high quality moisture resistance. Such panels are suitable for use in the manufacture of containers. Available in sizes up to 3,658 mm, the board can be any size up to 12 meters. The glass fiber content is 25-40% by weight. The standard colors are gray and sub-white. The board can be cleaned with steam .Feature editing
Main technical features and applications of white FR4 light board: stable electrical insulation performance, good flatness, smooth surface, no pits, thickness tolerance exceeding standard, suitable for high performance electronic insulation requirements, such as FPC reinforcement board, tin furnace High temperature resistant board, carbon film, precision star wheel, PCB test stand, electrical (electrical) equipment insulation partition, insulation pad, transformer insulation, motor insulation, deflection coil terminal board, electronic switch insulation board, etc.Production process editor
Among the epoxy fiberglass boards, FR-4 glass fiberboard has always maintained its absolute superiority and dominant position, occupying most of the middle and high-end market. The main reason is that FR-4 integrates various industrial properties. And it has high flame retardancy and is therefore favored by the market.
FR-4 resin glue
(1) Resin glue formula In the epoxy resin glass fiber board industry, FR-4 glass fiber board has been produced for many years, and the resin glue liquid formula is basically the same.
(2) Preparation method: 1) dimethylformamide and ethylene glycol methyl ether, stirred and mixed to form a mixed solvent. 2) Add dicyandiamide and stir to dissolve. 3) Add epoxy resin and mix by stirring. 4) 2-Methylimidazole was previously dissolved in an appropriate amount of dimethylformamide, and then added to the above materials, followed by thorough stirring. 5) After parking (maturing) for 8 hours, the relevant technical requirements for sampling and testing.
(3) Resin glue technical requirements: 1) Solid content of 65% to 70%. 2) Gel time (171 ° C) 200 to 250 s. Bonding sheet
(1) Manufacturing process After the fiberglass cloth is unwound, it passes through the guiding roller and enters the glue tank. After dipping, the resin is controlled by a rubberizing roller and then enters the oven. During the drying process, volatiles such as solvents are removed while the resin is in a semi-cured state. After exiting the oven, cut it according to the size requirements and stack it neatly on the storage rack. The gap of the squeeze roller was adjusted to control the resin content. Adjust the temperature, air volume and speed of each temperature zone of the oven to control the gel time and volatile content.