Lamination Fatigue
Thermal and mechanical deterioration of the compressible materials used in multilayer circuit board lamination presses occurs after repeated thermal cycles. High temperature pressing requires consistent pressure distribution, which suffers when cushion pad degradation occurs. This progressive breakdown reducing pad resilience directly affects the uniformity of the board lamination.
Over time, the internal polymeric structure of the padding breaks down under the joint influence of high heat and pressure. The loss of elasticity prevents the pads from conforming to the surface of the press plates, resulting in pressure gradients across the product stack.
Pressure Nonuniformity
Imperfect heat transfer and localized high-pressure spots occur when the cushioning material loses its mechanical integrity. This leads to thickness variation across the lamination panel and can cause resin-starved areas or voids. Manufacturers track the number of press cycles to retire the pads before they cause circuit board warping or incorrect cured thickness.
New materials using advanced elastomer composites withstand more cycles before failing.
Preventive Maintenance
Thickness checks and pressure-sensitive film tests detect pad failures before they yield defective panels. Replacing the deteriorated press padding ensures that the lamination stacks receive equal force across all regions of the copper circuitry. Consistent pad replacement cycles minimize lamination defects.
