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Process technology of FR-4 CCL

In the production of epoxy resin copper-clad laminates, FR-4 CCL have always maintained its dominant position, as a kind of insulation materials. According to reports, the main reason is that this product has excellent comprehensive performance and flame retardancy, and has a better function-price ratio, which is welcomed by users.
1.Resin glue for FR-4 CCL
(1) Resin glue formulation In the epoxy resin copper-clad laminate industry, FR-4 epoxy copper-clad laminates have been produced for many years. The resin glue formulation is basically the same.
(2) Resin preparation method for FR-4 CCL
1) Dimethylformamide and ethylene glycol methyl ether are stirred and mixed to prepare a mixed solvent.
2) Dicyandiamide was added and dissolved by stirring.
3) Add epoxy resin and stir.
4) 2 -methylimidazole is previously dissolved in an appropriate amount of dimethylformamide, and then added to the above materials, and continued to be fully stirred.
5) After being parked (aged) for 8 hours, the technical requirements related to sampling and testing.
(3) Technical requirements for resin glue of FR-4 CCL
1) The solid content is 65% to 70%.
2) Gel time (171 ° C) 200-250s.

2.FR-4 CCL
(1) FR-4 epoxy copper clad sheet manufacturing process
After unwinding the glass fiber cloth, it enters the glue tank through the guide roller. After dipping, the resin content is controlled by the squeeze roller, and then it enters the oven. During the oven, volatiles such as solvents are removed, while the resin is in a semi-cured state. After exiting the oven, cut according to the size requirements and stack them neatly on the storage rack. Adjust the gap of the squeeze roller to control the resin content. Adjust the temperature, air volume and vehicle speed of each temperature zone of the oven to control the gel time and volatile content.
(2) Testing method In the manufacturing process of the bonding sheet of FR-4 epoxy copper-clad board, in order to ensure the quality, various technical requirements must be tested regularly. The detection method is as follows:
1) Resin content
① At least 25mm of the edge of the adhesive sheet, cut 3 samples according to the width direction left, center and right. The sample size is 100mm × 100mm, and the diagonal line is parallel to the warp and weft directions.
② Weigh one by one (W1), accurate to 0.001g.
③ Put the sample in a muffle furnace of 524-593 (burn for more than 15 minutes, or burn until the carbides are completely removed.
④ Move the sample to a desiccator and cool to room temperature.
⑤ Weigh one by one (W2), accurate to 0.001g.
⑥ Calculation: resin content = [(W1-W2) / W1] × 100%

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