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The key characteristic for flexible board substrates is peel strength; however, the peel strength of flexible boards is not constant, difficult to measure, and independent of failure modes.

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Rigid board bonding sheets are more suitable for multilayer lamination, exhibiting excellent flowability in the initial polymerization stage, allowing for smooth encapsulation of circuitry.

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A protective film is formed and then applied around the etched lines to help the low-flow adhesive create a seal. However, this method is not suitable for rigid-flex board manufacturing.

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

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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.

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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.

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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.

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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.

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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.

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

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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.

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The protective film and adhesive should be excluded from the plated holes of the flexible board, and window openings and adhesive sheets can be used instead.

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The flexible sheet is manufactured using traditional methods, with the protective film only applied to the bending areas; the rigid areas are still bonded using epoxy resin adhesive sheets.

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Traditional flexible board adhesives expand significantly upon heating. If acceptance testing, including stress testing, is only performed on rigid plated hole areas, it is better to avoid using adhesives with high plasticity and low cross-linking density.

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Traditional acrylic resins and modified epoxy resin systems are relatively inexpensive materials that can meet the needs of low-layer, thin copper foil product manufacturing processes.

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Many rigid-flex panel layers are laminated together using flexible sheets, which include acrylic resin and coated adhesives.

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The cover plate is a reinforcing material that reduces the impact of assembly stress on the rigid-flex panel. Occasionally, some appearance quality issues may occur, such as exposed texture or scratches.