Prepreg Rheology Control in Thin Core Laminate Stacks
Precise control of prepreg minimum viscosity and press temperature ramp rates prevents core squeeze out and micro voiding in thin laminate stackups.
106 Glass Weave
Fabrication Specification
Borosilicate glass filaments configured in a plain grid pattern provide the structural dielectric base for high density interconnect printed circuit boards. The 106 glass weave utilizes a very thin profile of approximately one mil in thickness to allow for tighter signal traces and improved impedance control in multi-layer stackups. Low profile options for this base material offer reduced dielectric constant variation across the surface of the laminate.
Manufacturers deploy this specific fabric when designs demand high resin content to fill small gaps between densely packed copper features.
Dielectric Uniformity
Consistency in resin flow during the lamination process prevents signal skew by maintaining a uniform glass to resin ratio across the board. The 106 glass weave offers a fine pitch opening that limits the concentration of glass bundles under high speed transmission lines. Variations in the local dielectric constant induce phase differences in differential pair signals and degrade signal integrity at high frequencies.
Engineers minimize this variation by orienting the board patterns relative to the direction of the glass fibres in the base laminate.
Physical Tolerance
Final board thickness requirements dictate the selection of this material to meet mechanical constraints in thin electronic devices. Laminate suppliers produce this specific fabric style to support the manufacturing of flexible or rigid circuits that require extreme miniaturization. Rigid boards utilize this style to achieve precise thickness specifications while maintaining high thermal stability during the assembly reflow cycle.
The limited thickness of the glass reinforcement forces a reliance on the surrounding resin system to carry the mechanical load of the completed circuit board.
Laminate Resin Flow and Fill Dynamics in Thin Core Multilayer Construction
Dynamic resin flow in thin core laminates governs post-press dielectric thickness, feature filling capability, and panel impedance uniformity.