#rigid-flex

The flexible board adhesive has low flowability, which helps prevent adhesive from seeping into the slotted areas.

Traditional flexible sheet adhesives are made in the form of bonding sheets or coated adhesives, suitable for rigid-flex sheets, and offer good cost-effectiveness for products with low layer counts and simple designs.

Differences between flexible sheet and rigid-flex sheet adhesives: Adhesive layer openings should avoid areas where adhesion is not required, and filler material should be made into thin sheets extending into the laminated cutouts. Adjust the thickness to be uniform and control adhesive flow.

Differences in adhesives between flexible boards and rigid-flex boards: Rigid-flex boards require more adhesive to fill the gaps between circuit lines during lamination.

The manufacturing process of rigid-flex boards differs from that of flexible boards. Only by creating a flat, smooth surface can good pattern transfer be achieved. A flat surface also helps improve drilling accuracy.

Adhesive-free materials offer higher stability than traditional flexible sheet materials, with glass transition temperature and coefficient of thermal expansion similar to rigid sheet materials, making them suitable for producing high-layer, high-density rigid-flex sheets.

Using adhesive-free materials to manufacture flexible sheets can reduce the cost and quality issues associated with conventional lamination and inner layer processing.

All flexible board adhesives must be excluded from the rigid area and plated hole area. This requires the use of special substrates, window processing, and pure film embedded in the flexible area.