Analysis of lamination process of mica board

The lamination process of mica board is an important process in lamination molding. The laminating process is to impregnate the mica sheet, select the slab according to the pressing thickness requirement, place it in the polished metal template, put it in the hot press, heat, press, cure, cool, demould and post-treatment between the two layers of the template, etc.

(1) Tape cutting this. The process is to cut the tape into a certain size, cutting equipment can be continuous fixed-length slicing machine, can also be cut manually. Tape cutting, the size of the requirement is accurate, the cut tape stacked neatly, the different content of rubber and liquidity of the tape are stacked, make a record of storage backup.

(2) Tape selection. The process of selecting the adhesive cloth is crucial to the quality of the laminate, such as improper selection, the laminate will be cracked, the surface of the pockmarked and other ills. In the selection of the surface layer of the plate, each side should be placed on the surface of 2 sheets of high glue content, liquidity of the tape. The volatile content should not be too large, and if the volatile content is too large, it should be dried and treated before use.

(3) Hot pressing process. The key in the pressing process is the process parameters, of which the important process parameters are temperature, pressure and time. Overcome the vapor pressure of volatiles, make the adhesive resin flow and make close contact between the adhesive tape layers; prevent the plate from deformation when cooling. The amount of forming pressure is determined by the curing properties of the resin. Usually 5.9MPa for epoxy/phenolic laminates and 3.9-5.9MPa for epoxy sheets.

(4) Post-treatment. The purpose of post-treatment is to further cure the resin until it is fully cured, while partially eliminating the internal stress of the product and improving the bonding properties of the product. The post-treatment of epoxy and epoxy/phenolic sheets is kept in the temperature environment of 130-150℃ for about 150min.